JPH11344219A - Liquid fuel combustion equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically correct a combustion amount error caused by a change in a fuel level position in a fuel tank by adjusting a driving power of a pump to regulate a fuel flow rate according to a difference between a sensed temperature of a temperature sensor for sensing a temperature of a heating medium heated by a combustion heat and a reference temperature. SOLUTION: A liquid fuel in a fuel tank 8 is pumped by a pump 10, vaporized by a vaporizer 12, then supplied to a combustor 21 to be burned, and heating media such as the air, water and the like are heated by its combustion heat. In this case, as the pump 10, a pump for adjusting its fuel flow rate by adjusting its driving power is used, and controlled by a pump driving power controller 71. That is, this combustion equipment comprises a temperature sensor 6 for sending a temperature of a heated heating medium, and a reference temperature setter 72 for setting a suitable temperature of the medium at a reference temperature at a temperature sensor installing position. If the sensed temperature of the sensor 6 is, for example, lower than the reference temperature, the pump driving power is controlled to be adjusted to increase the flow rate of the fuel supplied to a burning unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel combustion apparatus for burning liquid fuel, supplying a heat medium such as air or water heated by the combustion heat to the outside, and providing the medium for heating or hot water supply. It is.

[0002]

2. Description of the Related Art Such a liquid fuel combustion apparatus is used in various practical apparatuses as follows. First, an oil fan heater that heats air with the combustion heat of burning oil and uses it as warm air together with combustion exhaust gas for heating. Combustion air is sucked from outside to burn oil, and the heat of combustion heats the air sucked from inside the room, supplies it to the room as warm air, and discharges the combustion exhaust gas to the outside. . An oil hot water supply device or the like is used for heating cold water with the combustion heat of burning oil to use for hot water supply.

FIG. 9 is a longitudinal sectional view of a petroleum fan heater shown as a typical example of the prior art. In FIG. 9, 171
Numeral denotes a fuel tank which receives fuel supply required for maintaining a substantially constant fuel level from the cartridge tank 172. A pump 173 supplies the fuel in the fuel tank 171 to the vaporizer 175 through the fuel supply pipe 174. The carburetor 175 includes a fuel heating unit, a power heater, a temperature sensor C for detecting a carburetor temperature, an electromagnetic valve, an injection nozzle, a return port, and an electromagnetic coil. With the return port opened, the vaporizer 175
A return flow path communicating with the fuel tank 171 through the return pipe 176 can be opened, and by canceling the input to the electromagnetic coil, the injection nozzle is opened and the return port is closed, and the vaporizer 175 to the combustor 177 Can be opened. The combustor 177 includes a vaporizer 175
, A mixing chamber, a flame port, an igniter, and a flame rod. 17
Reference numeral 8 denotes a combustion tube which constitutes a combustion space 179 viewed from the flame opening. Numeral 180 denotes a heat conductor which recirculates a part of the combustion heat in the combustion space 179 to the vaporizer 175, and is provided to reduce the electric power of the electric heater for heating the vaporizer 175. Reference numeral 181 denotes an air fan, and air taken in from an air intake port (not shown) is guided to an air duct 182 and the like and heated by combustion heat, and together with combustion exhaust gas generated in the combustion space 179, enters a room through a hot air supply port (not shown). Supplied. 183 is an electric control unit, and 184 is an outer case.

FIG. 10 is a block diagram of a main part of the control system of the conventional oil fan heater shown in FIG. Reference numeral 185 denotes a heater power control unit which supplies power required for heating and maintaining the vaporizer temperature to a constant temperature based on the temperature detected by the temperature sensor C attached to the vaporizer to the power heater. Reference numeral 186 denotes a temperature sensor B which detects the temperature of the air sucked from the room by the air fan 181 and supplies a detection signal to the combustion amount determination unit 187. A room temperature setting unit 188 sets a target room temperature for heating by manual operation. The combustion amount determination unit 187 determines the combustion amount to be burned and the air flow of the air fan according to the magnitude of the difference between the detected temperature of the temperature sensor B 186 and the set temperature of the room temperature setting unit 188. A signal according to this determination is supplied to the air fan control unit 189 and the pump drive power control unit 190,
Air fan control section 189 and pump drive power control section 190
Then, a driving power selected from a plurality of patterns of driving power set in advance is supplied to the air fan 181 and the pump 173. The indoor air sucked by the air fan 181 is
It is heated by combustion heat and supplied to the room as warm air together with the combustion exhaust gas.

The technique of controlling the amount of combustion in these conventional liquid fuel combustion apparatuses is to determine a target amount of combustion and to supply a pump with driving power linked in advance to a fuel flow rate corresponding to the target amount of combustion. It is a technology that the quantity should be realized, and this technology is disassembled in detail as follows. First, a first technique for manufacturing a fuel flow path, which is a basic condition of fuel flow rate control, under constant conditions, and then, a second technique for manufacturing a pump realizing a predetermined fuel flow rate under a predetermined driving power. The technology, and then the third technology for reducing the error of the driving power supplied to the pump is used, and the expected amount of combustion cannot be realized even if any technology is lacking.

The first technique is to turn a cartridge tank upside down on a base tank and supply fuel from the base tank to a combustion section by a pump. When the fuel in the base tank is consumed, the fuel is transferred from the cartridge tank to the base tank. Is supplied to prevent a decrease in the oil level, and by maintaining substantially the same oil level regardless of fuel consumption, a head difference from a fuel supply source to a fuel supply destination is maintained at a substantially constant condition. This technology is widely used in practical use by being adopted in small combustion devices, but requires manual operation of inverting the cartridge tank on the base tank, so the cartridge tank itself becomes large. Then it is difficult to implement.

Another first technique is that, in a device in which a main body including a combustion section and a fuel tank are separately provided, and the main body is installed indoors and the fuel tank is installed outdoors, the main body and the fuel tank are separately provided. Since the fuel tank is installed according to the circumstances of the installation location, the fuel flow paths are installed under different conditions. In such a case, Japanese Unexamined Patent Application Publication No.
As described in Japanese Patent Publication No. 39 as a conventional example, an auxiliary oil tank 9 having a constant oil level is installed in the main body, and a fuel flow path from the auxiliary oil tank 9 to the combustion equipment 4 is formed. While maintaining a certain condition, the electromagnetic pump 14 is used during this time, and the fuel is supplied from the fuel oil tank 3 to the auxiliary oil tank 9 by the signal of the lower limit liquid level sensor 11 including a float switch or an optical sensor installed in the auxiliary oil tank 9. This is a technique for maintaining the oil level of the auxiliary oil tank 9 within a limit by using a pump 2 ′ which operates and stops the operation by a signal of an upper limit liquid level sensor 10. It requires a liquid level sensor, an oil level detector, and two pumps, and inevitably increases costs.

According to the invention disclosed in Japanese Patent Application Laid-Open No. 7-158839, the fuel flow rate is determined by adjusting the number of openings and the degree of opening of the valve together with the electromagnetic pump 2 and an accumulator 66 for accumulating the discharge pressure of the pump. This technology uses a variable flow control valve 1 to obtain a constant fuel flow rate with a single pump without using an auxiliary oil tank. This technology requires an accumulator and a variable flow control valve in addition to the pump, and is structurally Complicated and costly disadvantages cannot be denied.

The second technique is a technique for reducing the fuel flow rate error of the pump from about 30% to several percent. The pump is manufactured according to a slightly larger flow rate, and the flow rate is measured once. This is a technique in which a fixed resistor having a resistance value selected according to a deviation from a target flow rate is attached to an electromagnetic coil in series, and is disclosed in Japanese Patent Publication No. 7-110333 and is used in practice. This technique requires a complicated and time-consuming adjustment process, and has a drawback that a cost increase is unavoidable.

A third technique is that, in the manufacture of a pump drive power supply unit, a fine adjustment for compressing an output voltage variation of about ± 1 V to about ± 0.2 V in an output voltage is used,
The combination of the voltage adjustment unit of the drive power supply unit and the pump is pre-configured, and the combination
By implementing the flow control technology of 1033 gazette,
This is a technique for saving the trouble of finely adjusting the pump and the voltage adjustment unit separately, and is a technique disclosed in Japanese Patent Application Laid-Open No. 8-128386. It is a technology based on the pump flow adjustment step, and has the drawback that the effect is not exhibited if the step is not performed.

Another third technique is to provide a device in which the fuel supply amount does not fluctuate even when the power supply voltage fluctuates, as disclosed in JP-A-8-49840. The present invention relates to a technique related to an electromagnetic pump control device including a pulse correction unit 9 that corrects a pulse width or a pulse period set by a pulse setting unit 12 based on the determination of the above.

A common drawback of the above prior art is that both techniques increase flow resistance due to flow errors caused by aging of this type of equipment, for example, tar accumulating in the fuel flow path of the equipment. The flow rate error due to the cause of increase, the flow rate error due to the increase of the flow path resistance due to the attachment of foreign substances such as dust to the narrow portion of the fuel flow path, and the flow resistance due to the removal of the tar and the foreign substances described above. The error correction function for the flow rate error due to the reduction, the flow rate error due to the increase in the flow rate loss through the sliding part of the pump and the like, and the like, is not exhibited. Also, due to fluctuations in the fuel temperature inside the fuel tank, especially when the fuel tank is installed outdoors,
It did not have an effective correction function for the combustion error caused by the fluctuation of the viscosity of the fuel itself. Further, regarding the control of the combustion amount corresponding to the fluctuation of the heat medium flow rate due to the water pressure fluctuation in the case of a hot water supply device using tap water as a heat medium (for example, the water pressure fluctuation due to tap water usage at a nearby position), Problems such as no control function remain unsolved.

[0013]

PROBLEM TO BE SOLVED [Problem 1] When a fuel tank not provided with a function of holding the fuel surface at a fixed position is used, the fuel level in the fuel tank accompanying fuel consumption and refueling is increased. [Function 2] In the prior art, a flow rate adjustment process was performed for each individual pump to obtain a fuel flow rate that meets practical requirements. This process was complicated and time-consuming, so high costs could not be avoided. In the present invention, a function of automatically correcting a fuel flow rate error by a pump in which the flow rate adjusting step is omitted is added.

[Problem 3] In the conventional technique, fine adjustment of the output voltage is required in the pump drive power supply unit, and high cost cannot be avoided. According to the present invention, a function of automatically correcting a fuel flow rate error by a drive power supply unit in which fine adjustment of an output voltage is omitted is added.

[Problem 4] In the prior art, the fuel flow rate error caused by aging of the apparatus, for example, tar or dust adheres to the fuel flow path to increase the flow path resistance, or the flow rate is removed by removing these. A function for correcting a flow rate error caused by a decrease in road resistance or wear of a sliding portion of a pump has not been provided. For this reason, there has been a defect that the performance is deteriorated due to the combustion amount error due to aging and the practical quality is reduced, or the life of the device is shortened.
In the present invention, a function for automatically correcting the flow rate error caused by the aging of the above-described apparatus is added.

[Problem 5] In the prior art, in a liquid fuel combustion apparatus of a type in which a combustion section and a fuel tank are formed separately and installed according to individual installation conditions, the fuel conditions are different because the installation conditions are individually different. Does not exhibit flow control effect. For this reason, an auxiliary oil tank and two pumps are required, or an accumulator and a variable flow regulating valve are required in addition to the pump. In the present invention, a function of automatically correcting a flow rate error caused by a difference in installation conditions of the apparatus with one pump is added without using the additional unit as described above.

[Problem 6] The prior art has not been provided with a function of correcting an error in the fuel flow rate caused by a change in the fuel temperature. In the present invention, a function of automatically correcting a flow rate error due to this cause is added.

[Problem 7] Conventionally, in the case of using combustion heat for hot water supply, a control function for adjusting a combustion amount corresponding to a water pressure fluctuation of a tap water source has not been provided. In the present invention, in addition to the above functions, a function of adjusting the amount of combustion in response to the water pressure fluctuation and maintaining the hot water supply temperature at a constant temperature is added.

[0019]

The combustion amount error in this type of combustion apparatus is caused by various causes as described above. It is important to solve the above problems individually, but in the present invention, it is generated by means of "detecting the generated combustion amount error and correcting the fuel flow rate based on this detection signal". It was decided to automatically correct the combustion error.

In the liquid fuel combustion apparatus of the present invention, a pump capable of adjusting the fuel flow rate by adjusting the driving power of the pump is used, and the combustion section is capable of adjusting the amount of combustion by adjusting the fuel flow rate in the combustion section. A temperature sensor A for detecting the temperature of the heat medium heated by the combustion heat generated in the combustion section, and a reference temperature setting section for setting an appropriate temperature of the heat medium at the installation position of the temperature sensor A as a reference temperature. When the detected temperature of the temperature sensor A is lower than the reference temperature, the pump drive power is adjusted to increase the fuel flow rate, and when the detected temperature of the temperature sensor A is higher than the reference temperature, the pump drive power is adjusted. When the fuel flow rate is reduced and the detected temperature of the temperature sensor A matches the reference temperature, the detected temperature is substantially matched with the reference temperature by continuing without changing the pump driving power. Implementing the means for installing the Mel pump drive power control unit.

In the above, the temperature sensor A detects the temperature of the heat medium heated by the combustion heat generated in the combustion section of the apparatus, such as a thermistor or a thermocouple, and provides the detected temperature as an electric signal. Temperature sensor suitable for The temperature sensor A is installed at a certain position in the flow path where the heat medium is heated, in a structure suitable for detecting the heat medium temperature at that position. The installation position of the temperature sensor A is one of the suitable positions near the end of the flow path where the heat medium is heated, but such as the middle position of the flow path where the heat medium is heated or the supply destination of the heated heat medium, It does not matter. What is necessary is that the appropriate temperature of the heat medium at the installation position can be set as the reference temperature, and the detection temperature is lower than the reference temperature when the combustion amount is too low, and the detection temperature is higher than the reference temperature when the combustion amount is too high. . The flow rate of the heat medium may be a fixed flow rate, or may be a variable flow rate. The reference temperature may be specified by one point temperature, or may be specified by a certain temperature range. In a device in which the heat medium flow rate is variable, the reference temperature may be a fixed reference temperature in the entire range of the heat medium flow rate, or may be a reference temperature that changes stepwise or continuously according to the heat medium flow rate. Good. The reference temperature setting unit may be a reference temperature setting unit whose reference temperature is set in advance and cannot be changed, or may be a reference temperature setting unit whose setting can be changed. The reference temperature may be set as a numerical value of the temperature itself, or may be set by a signal or the like that is convenient to compare with the temperature detected by the temperature sensor A.
It is also possible to install the temperature sensors A at a plurality of positions and set a reference temperature corresponding to each of the temperature sensors A. Instead of setting the heat medium temperature at the appropriate combustion amount as the reference temperature, setting the heat medium temperature at the time of excessive combustion as an excessive temperature and setting the heat medium temperature at the time of insufficient combustion as an undertemperature is essentially a matter of fact. Since they are the same, they are included in the present invention (claim 1).

As a means for adjusting the pump driving power, an adjusting means such as the following example is effective.

The amount of adjustment in one control operation is appropriately set, and as long as there is a difference between the detected temperature of the temperature sensor A and the reference temperature, the set driving power adjustment is repeatedly performed, and the detected temperature and the reference temperature are adjusted. An adjusting means for stopping the adjustment of the driving power when the temperature is matched is referred to as a minimum adjustment amount repetitive approach (claim 2).

The relationship between the magnitude of the difference between the detected temperature of the temperature sensor A and the reference temperature and the amount of drive power adjustment is set in advance when the difference is large and small when the difference is small. An adjusting means for matching the detected temperature with the reference temperature in a short time by the number of control operations is referred to as a weight adjustment amount approach method (claim 3).

From the value of the difference between the temperature detected by the temperature sensor A and the reference temperature, the flow rate of the heat medium, and the specific heat of the heat medium, the error heat amount of the combustion amount is calculated, and the fuel flow rate corresponding to the error heat amount is calculated. Adjustment means for calculating the pump drive power corresponding to the fuel flow rate correction amount and correcting almost the entirety of the error by one adjustment is temporarily called a correction amount calculation method (claim 4).

An adjusting means for setting a plurality of pump drive powers in advance and selecting and executing power next to the current drive power based on the difference between the detected temperature of the temperature sensor A and the reference temperature (referred to temporarily as a set power selection method) Claim 5).

As a pump compatible with the liquid fuel combustion device of the present invention, any pump that can adjust the fuel flow rate by adjusting the driving power can be used.
An electromagnetic plunger pump that performs suction and discharge operations by reciprocating motion of a plunger driven by electromagnetic force is recommended.

[0028]

In the liquid fuel combustion apparatus according to the present invention, a temperature sensor A for detecting the temperature of the heated heat medium is provided, and the heat medium at the position where the temperature sensor A is provided is provided. If the detected temperature is lower than the reference temperature by comparing the detected temperature of the temperature sensor A with the reference temperature, the pump driving power is adjusted to reduce the fuel flow rate. Increase,
If the detected temperature is higher than the reference temperature, adjust the pump drive power to reduce the fuel flow rate.If the detected temperature matches the reference temperature, continue the pump drive power without changing the detected temperature. A pump driving power control unit that matches the reference temperature is installed, and the action of correcting the combustion amount error by adjusting the fuel flow rate is performed. The ability of the liquid fuel combustion apparatus of the present invention to correct the combustion amount error works effectively as long as the following three conditions are not lost. The three conditions are a condition in which the pump can adjust the fuel flow rate by adjusting the driving power, a condition in which the combustion unit can adjust the combustion amount by adjusting the fuel flow rate, and a condition in which the pump driving power control unit controls the temperature sensor A. This is a condition under which the driving power can be adjusted and supplied to the pump according to the detected temperature and the reference temperature as described above.

[Correction Action of Combustion Amount Error Due to Various Causes] Since the combustion amount error is an error of the heating medium heating power, as long as the combustion error exists regardless of the cause, the detected temperature of the temperature sensor A is the reference temperature. Causes a mismatch. In other words, when the cause of the combustion amount error is an error in the fuel flow characteristic inherent to the pump, an error in the driving power supplied to the pump, or due to accumulation of tar generated as the device ages, the pump mechanism Due to wear of the sliding part, due to solid matter mixed in the pump, due to different fuel supply system flow path conditions due to separate fuel tank and combustion part, due to fuel temperature, etc. And so on for any fuel flow error. Further, if the temperature detected by the temperature sensor A exceeds the reference temperature, it indicates that the combustion amount is excessive. Therefore, the combustion amount error is corrected by adjusting the pump drive power to reduce the fuel flow rate.
If the detected temperature is lower than the reference temperature, it indicates that the combustion amount is too small. Therefore, the combustion amount error can be corrected by adjusting the pump drive power to increase the fuel flow rate. Therefore,
The steps of adjusting the flow rate at the time of manufacturing a pump and the step of finely adjusting the voltage of a pump drive power supply at the time of manufacturing a combustion device, which are performed in the prior art, do not need to be performed, and occur due to aging of the device, which was impossible in the past. It is possible to automatically correct any combustion amount error such as a combustion amount error, and realize an appropriate combustion amount. Further, the action of correcting a flow rate error caused by a change in the diameter of the pump such as wear has an effect of extending the life of the pump.

[Adjustment of Combustion Amount Corresponding to Heat Medium Flow Rate Error] In the liquid fuel combustion apparatus of the present invention, if an error occurs in the heat medium flow rate for any reason, the temperature corresponding to the error in the heat medium flow rate at this time is determined. The difference between the detected temperature of the sensor A and the reference temperature occurs, the pump drive power is adjusted according to the difference, and the action of correcting the combustion amount error realizes the appropriate combustion amount according to the heat medium flow rate at this time. I do. Therefore, for example, when a small error occurs in the heat medium flow rate, usually, the heat medium temperature becomes too high, which may cause a danger such as a burn, a fire, or a failure of the device, or conversely, a large error in the heat medium flow rate. When such a phenomenon occurs, the device of the present invention generally uses a fuel flow rate correction action corresponding to a change in the flow rate of the heat medium to prevent a phenomenon in which the temperature of the heat medium is abnormally lowered and hinders the purpose of the apparatus. Even when a flow rate error occurs, it has an effect of maintaining a substantially appropriate heat medium temperature.

[Reference temperature setting change operation] When the liquid fuel combustion apparatus of the present invention is used for purposes such as heating and hot water supply, the appropriate temperature of the supplied heat depends on the purpose of heat use, various environmental conditions, and individual preferences. It often changes depending on such factors. For such a request, it is easily possible to design such that the setting of the reference temperature can be changed by an automatic operation or a manual operation, and the above request can be easily satisfied.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a liquid fuel combustion apparatus according to the present invention, a liquid fuel in a fuel tank is supplied to a combustion section by a pump, and the fuel is burned in the combustion section. In a liquid fuel combustion device that heats a heat medium and supplies the heat to the outside, the pump includes a pump that can adjust a fuel flow rate by adjusting a driving power, and the combustion unit adjusts a fuel flow rate. A temperature sensor A for detecting the temperature of the heat medium heated by the combustion heat and an appropriate temperature of the heat medium at the installation position of the temperature sensor A as a reference temperature. A reference temperature setting unit for controlling the pump driving power when the detected temperature is lower than the reference temperature according to a difference between the detected temperature of the temperature sensor A and the reference temperature, and supplying the adjusted power to the combustion unit. Increase the fuel flow rate, if the detected temperature exceeds the reference temperature, adjust the pump drive power to reduce the fuel flow supplied to the combustion section, and if the detected temperature matches the reference temperature, change the pump drive power A pump drive power control unit that makes the detected temperature substantially coincide with the reference temperature by continuing without performing the operation is provided.

A temperature sensor for detecting the temperature of the heated heat medium is a temperature sensor A, a temperature sensor for detecting the temperature of the heat medium before heating is a temperature sensor B, and a temperature sensor for detecting the temperature of the vaporizer is a temperature sensor. It will be referred to as sensor C.

[Embodiment 1] Embodiment 1 is an embodiment in which the present invention is applied to an oil fan heater. FIG. 1 is a longitudinal sectional view (side view) showing a configuration of a heat medium air flow path of the oil fan heater of the first embodiment, and FIG. 2 is a main part showing a configuration of a fuel flow path of the oil fan heater of the first embodiment. It is a longitudinal section (front view).
1 and 2, reference numeral 1 denotes an air inlet, 2 denotes an inlet guard, 3 denotes an air fan, 4 denotes an air duct, 5 denotes a hot air supply port, and 6 denotes a temperature supplied from the hot air supply port 5 to the room. Temperature sensors A and 7 for detecting the temperature of the wind are temperature sensors B for detecting the pre-heating temperature of the air sucked from the room. Numeral 8 denotes a fuel tank, which receives from the cartridge tank 9 fuel supply required to maintain a substantially constant fuel level. A pump 10 supplies the fuel in the fuel tank 8 to the vaporizer 12 through the fuel supply pipe 11. The vaporizer 12 includes a fuel heating unit 13, an electric heater 14, and a temperature sensor C1 for detecting a vaporizer temperature.
5. The electromagnetic valve 16 is composed of an electromagnetic valve 16, an injection nozzle 17, a return port 18, and an electromagnetic coil 19. The electromagnetic valve 16 is normally kept open with the injection nozzle 17 and the return port 18 closed, but is input to the electromagnetic coil 19. Thus, the injection nozzle 17 can be closed and the return port 18 can be opened and held. 20
A return pipe constitutes a fuel return flow passage communicating from the return port 18 of the carburetor 12 to the fuel tank 8. Reference numeral 21 denotes a combustor, which includes an injection nozzle 17 of the vaporizer 12 and an entrance 22 looking into the vicinity air, a mixing chamber 23, a flame port 24, an igniter 25, and a frame rod 26. Reference numeral 27 denotes a combustion tube which constitutes a combustion space 28 which the flame port portion 24 looks at. Reference numeral 29 denotes a heat conductor that recirculates a part of the combustion heat in the combustion space 28 to the carburetor 12 and is provided to reduce the power of the power heater 14 for heating the carburetor 12. Reference numeral 30 denotes an electric control unit, and 31 denotes an outer case. The arrows shown in FIG. 1 indicate that the air sucked from the air inlet 1 by the air fan 3 is led to the air duct 4 and the like, and the combustion gas generated in the combustion space 28 and the hot air supply port 5 into the room. It shows the streamlines supplied.

FIG. 3 is a longitudinal sectional view showing a detailed configuration of the pump 10 shown in FIG. 41 is a cylinder, 42 is a joint fitting, 43 is a suction pipe, these are integrally formed,
A plunger 46 is formed in a liquid-tight tubular body having a suction port 44 and a discharge port 45, and is accommodated in the tubular body in a reciprocating manner, and a support spring 47 for supporting the plunger.
, 48, a discharge valve 49, a discharge valve spring 50, and a discharge valve seat 51. 52 is an electromagnetic coil, 53 is an electromagnetic coil 5
2 is an input terminal, 54 is a magnetic path bracket, and 55 and 56 are a pair of magnetic poles. 57 is a suction valve provided in the plunger 46, 58
Is a suction valve spring, 59 is a suction valve seat, 60 is a filter provided in the suction port, and 61 is a pump chamber formed of a space between the suction valve 57 and the discharge valve 49. The pump 10 uses a magnetic force generated when a driving power such as a DC pulse power supplied from a driving power supply is supplied to the electromagnetic coil 52, and generates the plunger 4.
6 is driven upward. At this time, the fluid in the pump chamber 61 is pressurized. With this pressure, the discharge valve 49 is opened, and the fluid in the pump chamber is discharged to the discharge port 45 side. When the power supply to the electromagnetic coil 52 is stopped, the plunger is returned to the original position by the support spring. At this time, since the discharge valve 49 is closed and the volume of the pump chamber is increased, a negative pressure is generated in the pump chamber, and the suction valve 57 is opened by this negative pressure, and the fluid on the suction port side is sucked into the pump chamber. This fluid is air at the start of the first operation, but the air is discharged from the discharge port by the temporary operation, and is replaced with the fuel drawn from the suction port. Adjusting the voltage of the drive power supply supplied to the electromagnetic coil in the pump 10 requires that the plunger 46
In adjusting the intensity of pressurizing the fluid in 1, adjusting the pulse time refers to adjusting the time the plunger pushes up the pump chamber fluid, and adjusting the frequency reduces the number of reciprocating movements of the plunger. In the adjustment, the flow rate is increased by increasing the driving power, the flow rate is decreased by decreasing the driving power, and the fuel flow rate can be adjusted by adjusting the driving power. The pump shown in FIG. 3 is usually a pump called an electromagnetic pump or an electromagnetic plunger pump, but other types of pumps can be used as long as the flow rate can be adjusted by driving power and the pump is suitable for fuel supply. it can.

FIG. 4 is a configuration diagram of a main part of the control system according to the first embodiment. In FIG. 4, reference numeral 71 denotes a pump drive power control unit, and the detected temperature falls below the reference temperature in accordance with the difference between the detected temperature of the hot air temperature detected by the temperature sensor A6 and the reference temperature preset in the reference temperature setting unit 72. In this case, the pump drive power is adjusted to increase the fuel flow rate of the pump, and if the detected temperature exceeds the reference temperature, the pump drive power is adjusted to reduce the fuel flow rate of the pump. This control operation is performed every 500 msec, and the drive power corresponding to about 2% of the maximum combustion amount is adjusted by one control operation. Therefore, the control operation of 10 times and the time of 5 seconds are required to adjust the combustion amount of 20%. The response speed can be further increased or decreased easily from the viewpoint of design. However, in the first embodiment, the response speed is set as described above from the viewpoint of the heating application. Although the reference temperature can be variously designed as described above, the reference temperature in the first embodiment is fixed in the entire combustion amount range, and a reference temperature having a certain range is set. As the pump driving power, the AC power is once converted to DC 24 V DC, switched by a transistor to make DC pulse power, and supplied to the pump 10. 24 V DC is supplied to the pump when the switching signal is supplied to the base terminal of the transistor, and power supply to the pump is stopped when the switching signal is off. That is, the pulse time of the pump driving power can be adjusted by adjusting the switching signal ON time, and the frequency of the pump driving power can be adjusted by adjusting the switching signal OFF time. can do.
A method of shortening the OFF time of the switching signal to increase the fuel flow rate and increasing the OFF time to reduce the fuel flow rate is called a frequency control method, and is used in a large combustion area to extend the ON time of the switching signal. To increase the fuel flow and turn on
A method of reducing the fuel flow rate by shortening the time is called a pulse time control method, and is used in a small combustion amount region. Numeral 74 denotes an air fan control unit which adjusts the rotation speed of the air fan 3 based on the difference between the detected room temperature of the intake air detected by the temperature sensor B7 and the room temperature set by the room temperature setting unit 75, from the air suction port 1. The amount of air to be sucked and supplied to the room from the hot air supply port 5 is adjusted. When the difference between the detected room temperature and the set room temperature is large, the rotation speed of the air fan 3 is adjusted to the large air volume condition, and when the difference is small, the rotation speed of the air fan 3 is adjusted to the small air volume condition. . Reference numeral 76 denotes a heater power control unit, which is a temperature sensor C15.
And the power supplied to the power heater 14 of the vaporizer is adjusted so that the vaporizer temperature matches the preset temperature according to the difference between the detected temperature and the preset temperature set in the control unit 76 in advance. All the heat of the vaporizer heating in the preheating mode before the start of combustion is covered by the heater power, but when the combustion mode is entered, a part of the combustion heat is supplied to the vaporizer via the heat conductor 29. The operation of supplying only the shortage is performed.

The operation mode of the first embodiment includes a preheating mode and a combustion mode. The preheating mode is started by a manual operation or a timer, and based on a predetermined program, the solenoid valve 16 is closed, the injection nozzle 17 is closed, and the return port 1 is closed.
8, the power is supplied to the power heater 14 to preheat the carburetor 12, and when the temperature detected by the temperature sensor C <b> 15 reaches a predetermined set temperature, the preheating mode is ended and the combustion mode is automatically started. to go into. In the combustion mode, the carburetor 12 continues to supply power controlled to maintain a predetermined set temperature to the power heater 14, and
The air fan 3 and the pump 10 are started. The fuel supplied to the carburetor by the pump 10 is initially supplied to the return flow path returning to the fuel tank via the return port 18 and the return pipe 20, but a few seconds after the start of pump driving, the solenoid valve 16 sets the injection nozzle 17 By opening the return port 18 to the closed state, the fuel heated by the vaporizer 12 to increase the pressure,
The fuel is supplied to the combustor 21 through the injection nozzle 17 and forms an air-fuel mixture in the mixing chamber 23 together with the air drawn into the flow of the fuel, and is ignited by the igniter 25 in the combustion space 28 to start combustion. The blast air of the air fan 3 is heated by the combustion heat, and is supplied indoors as warm air from the hot air supply port 5 together with the combustion exhaust gas.

The operating conditions of the first embodiment will be described for each scene.
At the beginning of the combustion mode, the air fan 3 and the pump 10 are activated by being supplied with driving power corresponding to the medium combustion amount of the device. After a few seconds, the air fan 3 starts to operate at the difference between the detected temperature of the temperature sensor B7 and the set room temperature. The driving power of the pump 10 is controlled to the driving power of the blowing amount according to the magnitude of the temperature sensor A6.
Is controlled according to the difference between the detected temperature and the reference temperature. Therefore, when the operation is started in a state where the room temperature is significantly lower than the set room temperature, the air flow rate of the air fan and the fuel flow rate of the pump are controlled from the middle to the increasing direction, and the hot air temperature reaches the reference temperature at the maximum air flow rate of the air fan. It becomes almost stable with the amount of combustion that matches. If the operation is started with the room temperature slightly lower than the set room temperature, the air fan airflow and the pump fuel flow are both controlled from the middle to the decreasing direction, and the hot air temperature is reduced to the reference temperature at the minimum airflow of the air fan. It becomes almost stable with the amount of combustion that matches. When the room temperature rises due to the heating effect during the continuation of the combustion mode, the temperature detected by the temperature sensor B7 rises, the difference from the set temperature of the room temperature setting section is reduced, and the rotation speed of the air fan 3 is adjusted to send the air. Since the air volume is reduced, the temperature of the hot air rises, the temperature detected by the temperature sensor A6 exceeds the reference temperature, and control for reducing the amount of combustion is performed.
Is substantially stabilized at the combustion amount that matches the reference temperature. If the room temperature decreases due to the invasion of outside air while the combustion mode continues, the temperature detected by the temperature sensor B decreases and the difference from the set room temperature increases. Decreases, the detected temperature of the temperature sensor A6 falls below the reference temperature, the pump driving power is adjusted to increase the amount of combustion, and the detected temperature of the temperature sensor A6 becomes substantially stable at the amount of combustion that matches the reference temperature. While the combustion mode is continuing, if the set temperature of the room temperature is changed and set, for example, upward,
Since the difference between the room temperature, that is, the difference between the detected temperature of the temperature sensor B7 and the set room temperature is enlarged, the amount of air blow is adjusted accordingly, and the detected temperature falls below the reference temperature, so that the amount of combustion is increased. When the room temperature, that is, the temperature detected by the temperature sensor B7 exceeds the set temperature, the combustion is automatically stopped.

The stop of the combustion is executed in the case of the above-mentioned automatic stop in addition to the operation or the stop of the combustion by the timer. In any case, the solenoid valve 16 is closed and the injection nozzle 17 is closed.
The fuel supply to the combustion section is stopped with the return port 18 opened, the power supply to the pump 10 and the power heater 14 is stopped, and the air fan 3 is stopped after a while. In the case of the combustion stop described above, some of the control functions continue to function, and the automatic reburning is performed when the room temperature falls below the set room temperature. However, since the automatic safety control that stops all the functions in three hours from the start of the first preheating mode operates, the above-mentioned automatic reburning is not executed in the state where all the functions are stopped. This automatic safety control can be extended for 3 hours by a reset operation.

In the combustion amount error correcting operation of the first embodiment, when the detected temperature of the temperature sensor A6 is lower than the reference temperature, control for adjusting the pump driving power to increase the fuel flow rate operates, and the detected temperature is adjusted to the reference temperature. When the temperature exceeds the temperature, the pump driving power is adjusted to control the fuel flow rate to decrease, and when the detected temperature matches the reference temperature, the pump driving power is continuously supplied without being changed. By adjusting the pump driving power, a combustion amount error due to different causes such as a fuel flow rate error peculiar to the pump, a voltage adjustment error of the pump driving power supply, and a fuel flow rate error due to aging of the device is corrected to an appropriate combustion amount. The function of correcting the combustion amount error is described in the above problem 2,
This is a function to solve Problem 3 and Problem 4.

[Second Embodiment] A second embodiment is directed to a hot air system of a type in which a fuel tank and a combustion section are separately formed and are installed under various installation conditions in accordance with the situation of each specific installation place. Examples of implementing the present invention. FIG. 5 is a longitudinal sectional view of a main part showing the configuration of a warm air device according to the second embodiment. Reference numeral 83 denotes a fuel supply pipe for supplying fuel from the fuel tank 82 to the main body 81. Reference numeral 84 denotes a pump that performs a pumping operation by reciprocating a plunger driven by electromagnetic force by a pump. Can be adjusted. 85 is the pump 8
A fuel supply pipe 86 disposed at the discharge port 4 is a nozzle constituting the tip of the fuel supply pipe 85. A vaporizer 87 includes a heater 88 for heating the vaporizer, a temperature sensor C89 for detecting the vaporizer temperature, a heat conductor 90 for returning the combustion heat to the vaporizer, and a mixing chamber 91. Reference numeral 92 denotes a combustor, and the flame outlet 9
3, a igniter 94, a flame rod 95 for detecting abnormal combustion by monitoring the conductivity of the flame, and a combustion space 96. Reference numeral 97 denotes an air supply fan which supplies outdoor air sucked from an air supply port 98 to a mixing chamber 91 and a combustion space 96 through an air supply pipe 99.
To supply. Reference numeral 100 denotes an exhaust fan, which is coaxial with the air supply fan 97, and converts the exhaust gas from the combustion space 96 into the heat exchanger
1. The air is exhausted from the exhaust port 103 through the exhaust pipe 102 to the outside. Reference numeral 104 denotes an air fan which sucks room air from the back of the main body 81 and heats it with the heat exchanger 101 to generate hot air.
1 is supplied into the room from a hot air supply port provided on the front surface. 10
5 is an electric control unit. A temperature sensor A (not shown)
106 is a heat exchanger 1 in the air flow path of the air fan 104.
01 and a hot air supply port, and comprises a temperature sensor for detecting hot air temperature. Similarly, a temperature sensor B1 (not shown)
Reference numeral 07 denotes a temperature sensor which is provided in the air suction passage of the air fan 104 and detects the temperature of the suction air before heating. Further, the pump 84 is formed of an electromagnetic plunger pump having basically the same type and the same properties as the pump 10 used in the first embodiment.
Since the design related to the partial capacity is changed only in accordance with the design conditions of the second embodiment, the detailed configuration is omitted.

FIG. 6 is a block diagram of a main part of the control system according to the second embodiment. Reference numeral 111 denotes a room temperature setting unit which can manually set the target room temperature of the heating function. Reference numeral 112 denotes an air fan control unit which controls the temperature detected by the temperature sensor B
Driving electric power corresponding to the magnitude of the difference below the set room temperature of 1 is supplied to the air fan 104, and the air flow is adjusted by controlling the number of revolutions of the air fan 104 so as to correspond to the magnitude of the heating load.
Reference numeral 113 denotes a reference temperature setting unit which is preset with an appropriate temperature of the hot air at the installation position of the temperature sensor A 106 as a reference temperature. Reference numeral 114 denotes a pump drive power control unit which supplies the pump 84 with drive power adjusted according to the difference between the temperature detected by the temperature sensor A 106 and the reference temperature set by the reference temperature setting unit 113. In the second embodiment, 2% control sections are set before and after a reference temperature defined in a certain temperature range, and 10% control sections are set above and below the 2% control section, respectively, so that the detection temperature of the temperature sensor A is adjusted by 2%. When the temperature is in the zone, the pump drive power is adjusted corresponding to about 2% of the maximum combustion amount at a time, and when the detected temperature of the temperature sensor A is in the 10% adjustment zone, 10% of the maximum combustion amount is adjusted. The adjustment is performed by the weight adjustment amount approach that adjusts the pump drive power corresponding to Reference numeral 115 denotes a heater power control unit which supplies power to the power heater 88 such that the detected temperature of the temperature sensor C89 for detecting the vaporizer temperature matches a predetermined set temperature. Reference numeral 116 denotes a supply / exhaust fan control unit which supplies a signal indicating the air volume of the air fan 104 supplied from the air fan control unit 112, a signal indicating the detected temperature of the temperature sensor B107, and a signal indicating the detected temperature of the temperature sensor A106. The calculated value of the current combustion amount is obtained from the air fan air volume, the temperature rise width, the specific heat of air, and the heat exchange efficiency given in advance,
The calculated value of the present combustion amount is controlled to the number of rotations of the supply / exhaust fan corresponding to the air amount obtained from the stoichiometric air amount and the combustion excess air ratio based on the combustion engineering. It should be noted that the air volume of the air supply fan 97 is the air volume of the combustion air, and the air volume of the exhaust fan 100 is the air volume of the combustion exhaust gas. By making the design of the impeller of both fans correspond to each air volume for the different air volume of both fans,
Both fans have a one-motor coaxial configuration so that they can simultaneously perform the function of supplying combustion air and the function of discharging combustion exhaust gas.

The operation mode of the second embodiment includes a preheating mode and a combustion mode. The preheating mode is started by a direct operation or a timer, and the power is supplied to the power heater 88 based on a predetermined program so that the vaporizer 8 is operated.
7 is preheated, and when the temperature detected by the temperature sensor C89 reaches a predetermined vaporization temperature, the preheating mode is ended and the combustion mode is automatically entered. In the preheating mode, all the heat of the vaporizer heating is covered by the heater power, but in the combustion mode, a part of the combustion heat is supplied to the vaporizer via the heat conductor 90, so that the power control to supplement the shortage of the heater power is performed. Will be implemented.

The operating condition of the second embodiment will be described. The air fan 104 and the pump 84 at the beginning of the combustion mode are started by supplying the driving power corresponding to the medium combustion amount of the apparatus. Is adjusted to the air volume of the air fan according to the magnitude of the difference in which the temperature detected by the temperature sensor B107 is lower than the set room temperature, and the driving power of the pump 84 is adjusted according to the difference between the temperature detected by the temperature sensor A106 and the reference temperature. . Therefore, when the operation is started in a state where the room temperature is much lower than the set room temperature, the air flow rate of the air fan and the fuel flow rate of the pump are controlled from the middle to the increasing direction, and the hot air temperature reaches the reference temperature at the maximum air flow rate of the air fan. It stabilizes at the same amount of combustion. When the operation is started with the room temperature slightly lower than the set room temperature, the air flow rate of the air fan and the fuel flow rate of the pump are both controlled from the middle to the decreasing direction. It becomes almost stable at the amount of combustion that matches the temperature. When the room temperature rises due to the heating effect while the combustion mode is continued, the temperature detected by the temperature sensor B107 rises, the difference from the temperature set in the room temperature setting section decreases, and the rotation speed of the air fan 104 is adjusted to adjust the air volume. Is reduced,
The hot air temperature rises, the temperature detected by the temperature sensor A106 exceeds the reference temperature, and control for reducing the amount of combustion operates. If the room temperature drops due to the intrusion of outside air while the combustion mode continues,
Since the difference between the temperature detected by the temperature sensor B and the set room temperature increases, control for increasing the air volume of the air fan operates, and the temperature of the hot air decreases, falls below the reference temperature, and the amount of combustion increases. If the set value of the room temperature is changed upward, for example, during the continuation of the combustion mode, the difference between the detected temperature of the temperature sensor B and the set room temperature increases. Is lower than the reference temperature, and the combustion amount is increased. When the detected temperature (room temperature) of the temperature sensor B exceeds the set room temperature, the combustion is automatically stopped.

The combustion stop is executed in the case of the above-mentioned automatic stop in addition to the operation or the stop of the combustion by the timer. In any case, the power supply to the pump 84 and the power heater 88 is stopped, and after a while, the power supply is stopped. The air fan 97, the exhaust fan 100, and the air fan 104 are stopped. In the case of the combustion stop described above, some of the control functions continue to function, and the automatic reburning is performed when the room temperature falls below the set room temperature.

The correction function of the combustion amount error in the second embodiment is roughly the same as that of the first embodiment, and automatically corrects the combustion amount error due to various causes similar to the first embodiment. It has a function to solve the above problems 2, 3, and 4.

In the second embodiment, in the case where the main body 81 and the fuel tank 82 are formed separately and are separately installed, the head between the fuel tank and the combustion section may be set according to the specific situation of the installation. The installation conditions of the fuel flow path such as the difference and the length of the fuel supply pipe 83 are individually set to different conditions.
For this reason, there is a problem that the flow rate of fuel supplied to the combustion unit is not constant, and conventionally, as described in the section of the related art,
This problem was solved by using another fuel tank and two pumps. In the device of the present invention, as shown in the second embodiment, the problem can be solved with only one pump. For example, in the case where the installed head difference is smaller than the standard, there is a problem that the combustion amount is excessive with respect to the standard, but in the second embodiment, when the combustion amount is excessive, the detection temperature of the temperature sensor A106 is reduced. In order to exceed the reference temperature, the pump drive power is adjusted to reduce the fuel flow rate,
The excessive combustion state is corrected, and the combustion amount in which the detected temperature matches the reference temperature is continued. Conversely, in the case where the head difference is larger than the standard, the correction is similarly performed, and the error in the combustion amount due to the installation condition is corrected. This function of correcting the combustion amount error is a function effective also for the combustion amount error caused by the movement of the fuel surface in the fuel tank.
This is a function to solve the problem 5.

In a combustion device in which a fuel tank is installed outdoors, the fuel temperature is strongly affected by the outdoor temperature, and the temperature of the fuel may be about minus 20 ° C. in a cold region. For this reason, an error occurs in which the fuel viscosity increases and the combustion amount decreases. In the second embodiment, the combustion amount error due to the fuel temperature is automatically corrected by the function of correcting the fuel flow amount error. This function is to solve the above problem 6.

[Embodiment 3] Embodiment 3 is an embodiment in which the present invention is applied to a bath hot water supply system. FIG. 7 shows a longitudinal sectional view of the heat source device. The main body 121 is mounted on the upper part of the fuel tank 122 and both are installed outdoors. Reference numeral 123 denotes a pump, which is an electromagnetic plunger pump similar to the pump 84 of the second embodiment, sucks fuel from a fuel tank 122 through a fuel supply pipe 124,
6 to be fueled. The vaporizer 126 is a fuel heating unit 12
7, power heater 128, temperature sensor C129, solenoid valve 1
30, injection nozzle 131, return port 132, electromagnetic coil 1
33, which is composed of a heat conductor 134 and is normally in a state where the injection nozzle 131 is open and the return port 132 is closed, but by inputting to the electromagnetic coil 133, the state is changed to a state where the injection nozzle 131 is closed and the return port 132 is open. be able to. Reference numeral 135 denotes a combustor, which includes an inlet 136, a mixing chamber 137, and a flame port 13
8, an igniter 139 and a frame lot 140. 141 is a combustion cylinder, 142 is an air duct, and constitutes an air passage 144 from the air inlet 143 to the outside of the combustion cylinder.
It communicates with a combustion space 145 inside the combustion cylinder, communicates with an exhaust port 147 via a heat exchanger 146. 148 is a cold water pipe,
A water passage communicating from the cold water pipe to the hot water supply pipe 149 via the heat exchanger 146 is formed. Reference numeral 150 denotes a flowing water pressure switch installed near the entrance of the heat exchanger 146 of the cold water pipe 148, a flowing water pressure switch that is turned on by a flowing water pressure of a certain level or more, 151 denotes a temperature sensor B for detecting the water temperature at the entrance of the heat exchanger, 152 is provided at the outlet of the heat exchanger, and a temperature sensor A for detecting the temperature of the heat medium at this position, and 153 is a return port 1
A return pipe from the fuel tank 32 to the fuel tank 122, 154 is an electric control unit, and 155 is an operation terminal installed indoors.
The pump 123 is basically an electromagnetic plunger pump of the same type as the pump 3 used in the first embodiment, and is only partially changed in design. Therefore, a detailed configuration is omitted to avoid duplication.

FIG. 8 is a configuration diagram of a main part of a control system in the bath hot water supply system according to the third embodiment, and shows a configuration of a control system relating to fuel flow control of the pump 123 and heater power control of the power heater 128 of the carburetor. It is. Note that the air volume control of the combustion air and the combustion exhaust gas is controlled by the combustion cylinder 14.
No electric control is required because the exhaust gas is exhausted by the chimney effect of the high-temperature gas in 1 and the intake air for combustion is used. 156 is a reference temperature setting unit,
Reference numeral 157 denotes a pump driving power control unit, which is a temperature sensor A152.
The pump driving power is adjusted based on the detected temperature and the reference temperature and supplied to the pump 123. 158 is a heater power control unit,
The power supplied to the power heater 128 of the vaporizer is adjusted based on the temperature detected by the temperature sensor C129 and a predetermined vaporizer temperature. Reference numeral 159 denotes a hot water faucet which is a cock for manually opening / closing the faucet and adjusting the amount of water, 160 a hot water supply pump, 161 a three-way valve, a flow path from the tap water source to the heat exchanger 146, and a bathtub 163. It is composed of a flow path toward the heat exchanger 146 and a valve capable of selecting any one of three phases of closing both flow paths. Reference numeral 162 denotes a reference temperature setting device.
The reference temperature can be changed from the bathroom. 163 is a bathtub.

The operation mode of the third embodiment includes a preheating mode, a standby mode, and a combustion mode (tap water hot water supply mode or reheating hot water supply mode). The preheating mode is started by a manual operation or a timer operation, and the solenoid valve 130 is set to the injection nozzle 131 based on a predetermined program.
The closed and return port 132 is opened, power is supplied to the power heater 128 to heat the vaporizer, and the preheat mode is terminated when the temperature detected by the temperature sensor C129 reaches a predetermined vaporizer temperature, and the preheat mode is automatically terminated. Move to standby mode. In the standby mode, only the operation of maintaining the vaporizer temperature is performed.
In the combustion mode, a tap water hot water supply mode in which cold water from a tap water source is heated and supplied to the bathtub, and a reheating hot water supply mode in which water in the bathtub is heated and supplied to the bathtub can be selected.
When the tap water hot water mode is selected, a flow path from the tap water source of the three-way valve 161 to the heat exchanger is opened, and the hot water faucet 15 is opened.
9, the water starts to flow in the cold water pipe 148, and the flowing water pressure switch 150 is turned on. When the condition that the temperature detected by the temperature sensor B151 falls below the reference temperature is satisfied, the tap water hot water supply mode is started. Starts. When the reheating hot water supply mode is selected, a flow path from the bathtub of the three-way valve 161 to the heat exchanger is opened, the hot water supply pump is driven, and the hot water supply faucet 159 is opened. The circulation starts and the flowing water pressure switch 150 is turned on. At this time, if the condition that the temperature detected by the temperature sensor B is lower than the reference temperature is satisfied, the reheating hot water supply mode is started.

In the combustion mode, the pump 123 is driven,
The fuel in the fuel tank is supplied to the preheated vaporizer 126, and the solenoid valve 130 is opened with the injection nozzle 131 opened and the return port 132 is opened.
By switching to the closed state, the fuel heated and vaporized by the vaporizer is supplied to the combustor 135, forms a mixture in the mixing chamber 137, and is ignited in the combustion space 145 to start combustion. The cold water in the cold water pipe 148 is heated by the heat exchanger 146 and supplied to the bath 163 via the hot water supply pipe 149 and the hot water faucet 159. When the temperature detected by the temperature sensor B 151 reaches the reference temperature or when the hot water faucet 159 is closed, the flowing water pressure switch 150 returns to the insulated state.
0 indicates that the injection nozzle is closed and the return port is opened, the fuel supply to the combustor is stopped, the pump drive power is stopped, the combustion mode is ended, and the mode returns to the standby mode. In the stand-by mode, the heater power is stopped by a manual operation or a timer operation to return to a state in which all functions are stopped.

In the combustion mode, the fuel flow rate of the pump 123 is controlled by a temperature sensor for detecting the hot water supply temperature at the outlet of the heat exchanger 146 within the range of the maximum combustion amount and the minimum combustion amount set from the combustion capacity of the combustion section. If the detected temperature is lower than the reference temperature according to the difference between the detected temperature of A152 and the reference temperature set in the reference temperature setting unit 156, the pump drive power is adjusted to increase the fuel flow rate, and the detected temperature becomes lower than the reference temperature. When the temperature exceeds the temperature, control is performed to adjust the pump drive power to reduce the fuel flow rate. The reference temperature in Example 3 has a range of a nominal temperature ± 1 ° C., and 1% control sections are set before and after this reference temperature, and 10% control sections are further set above and below this 1% control section. When the detected temperature of the sensor A is in the 1% control section, the pump drive power corresponding to about 1% of the maximum combustion amount is adjusted each time, and the detected temperature of the temperature sensor A is in the 10% control section. If the maximum combustion amount is 10
% Of the pump drive power is adjusted. The control operation of the pump drive power in this case is performed every 500 msec.

In the combustion mode, a change in the opening of the hot-water faucet 159, a change in the amount of hot-water supply due to fluctuations in the water pressure of the tap water source, a change in the temperature of the cold water supplied to the heat exchanger 146, etc. However, the amount of combustion is controlled by adjusting the pump drive power in accordance with the change in the heat load due to those causes, and the hot water supply temperature substantially matching the reference temperature is maintained. The reference temperature set in the reference temperature setting section 156 may be changed by the reference temperature setting device 16 if necessary.
2 allows the nominal temperature to be changed by manual operation. Power control to be supplied to the power heater 128 of the vaporizer is as follows.
The heater power controller 158 automatically adjusts the temperature detected by the temperature sensor C129 for detecting the vaporizer temperature so as to match a predetermined set temperature. In the preheating mode, all the heat of the carburetor is heated by the heater power, but in the standby mode, the heat to maintain the vaporization temperature is applied by the heater power, and in the combustion mode, part of the combustion heat is transferred to the heat conductor 134.
Is supplied to the carburetor through the heater, so that the heater power only needs to supplement the shortage.

The state of adjustment of the amount of combustion in a typical specific situation is as follows. At the beginning of the combustion mode, the combustion starts at a combustion amount of about 60% of the maximum combustion amount of the apparatus. The pump driving power is adjusted according to the difference between the temperature and the reference temperature. In the case of the tap water supply mode, since the temperature detected by the temperature sensor A152 at the beginning of the combustion is lower than the reference temperature, the temperature is in the 10% control zone below the reference temperature, and the combustion amount increases by 10% every 500 msec. Then, from the state where the detection temperature of the temperature sensor A indicates the inside of the 1% control zone below the reference temperature, the combustion amount is increased by 1%. When the amount of combustion increases excessively and the temperature detected by the temperature sensor A falls within the 1% control zone above the reference temperature, the fuel flow rate is reduced by 1%. When the temperature detected by the temperature sensor A matches the reference temperature, the increase or decrease in the combustion amount is stopped, and the pump driving power at this time is continuously supplied. If the water flow rate in this case is sufficiently large and the combustion amount increases to the maximum combustion amount, the response speed during this period requires 10 control operations and 5 seconds. If a small temperature rise is sufficient in the case of the reheating type hot water supply mode, the detected temperature of the temperature sensor A exceeds the reference temperature at the combustion amount at the start of combustion, and control to reduce the combustion amount operates. Requires a control operation 10 times and a time of 5 seconds until the minimum combustion amount. Practically, it is designed to satisfy the purpose within the maximum combustion amount and the minimum combustion amount, so that the practical response speed is within the above time. In the case where the heat load is increased during hot water supply, for example, when the reference temperature is changed to a higher temperature side,
Alternatively, when the amount of hot water is increased by operating the cock of the hot water faucet, for example, a difference in which the detected temperature is lower than the reference temperature occurs or is enlarged, so that the fuel flow rate is increased according to the magnitude of the difference. When the amount of combustion increases and the detected temperature matches the reference temperature, the increase in the amount of combustion stops,
In the former example, the hot water supply temperature rises according to the new reference temperature, and in the latter example, almost the same hot water supply temperature is maintained regardless of the increase in the hot water supply amount. In the case where the heat load is reduced during hot water supply, for example, when the reference temperature is changed to a low temperature side, or when the amount of hot water is reduced by operating the cock of the hot water faucet, the detected temperature of the temperature sensor A is set to the reference temperature. A difference exceeding the temperature occurs or expands, the fuel flow is reduced according to the magnitude of the difference, the combustion amount is reduced, and the decrease in the combustion amount is stopped when the detected temperature matches the reference temperature, In the former example, the reduction of the hot water supply temperature according to the new reference temperature,
In the latter example, almost the same hot water supply temperature is maintained irrespective of the decrease in the hot water supply amount. In the case where the water pressure of the tap water source fluctuates during hot water supply, for example, when the water pressure decreases and the hot water supply amount decreases and the hot water supply temperature rises, the detected temperature of the temperature sensor A exceeds the reference temperature, and the amount of combustion immediately increases. A decrease correction is made, and the original hot water temperature is returned. The same applies when the water pressure increases. When the fuel level in the fuel tank 122 decreases due to the execution of the combustion, the fuel flow rate usually decreases to decrease the combustion amount. Conversely, when the fuel is replenished, the fuel flow rate generally increases and the combustion amount decreases. In the liquid fuel combustion apparatus of the present invention, the error is detected as a difference between the detected temperature of the temperature sensor A and the reference temperature, and the pump driving power is adjusted. Automatically correct. When the condition in which the temperature detected by the temperature sensor B is lower than the reference temperature is lost or when the hot water faucet is closed, the water flow switch returns to end the combustion mode and enter the standby mode. In the standby mode, all functions are returned to a stopped state by a manual operation or a timer.

The third embodiment is an embodiment that solves the above-mentioned problem 1, problem 2, problem 3, problem 4, problem 6, and problem 7.

[0057]

According to the liquid fuel combustion apparatus of the present invention,
A temperature sensor A for detecting the temperature of the heat medium heated by the combustion heat is installed, and the pump driving power is adjusted according to the difference between the detected temperature of the temperature sensor A and the reference temperature set in the reference temperature setting section. By correcting the combustion amount error by adjusting the fuel flow rate, a function to automatically correct the combustion amount error caused by the change in the fuel surface position in the fuel tank is provided, and from a large tank where a cartridge tank type cannot be used. It is now possible to supply fuel directly to the combustion section. A function to automatically correct the combustion amount error caused by the variation in the flow rate of each pump has been added, and the flow adjustment process for each pump, which has been conventionally performed, has been eliminated. A function has been added to automatically correct the combustion amount error caused by variations in the output voltage of the pump drive power supply, eliminating the need for the fine voltage adjustment work conventionally performed.
A function has been added to automatically correct combustion amount errors caused by aging of the device, such as tar accumulation in the fuel flow path.
In the case where the main body including the combustion part and the fuel tank are separate and the fuel flow path from the fuel tank to the combustion part is installed under different installation conditions, the combustion amount error due to uneven installation conditions is automatically corrected. The function to do is added. A function has been added to automatically correct the combustion error caused by fluctuations in the temperature of the fuel in the tank. This is particularly significant in cold climates when the fuel tank is installed outdoors. In the case where the present invention is implemented in the hot water supply device, a function of automatically correcting a problem in which the supplied hot water temperature changes due to a change in the water pressure of the tap water source is added.

As described above, errors in the fuel flow rate caused by various causes can be eliminated at once, the number of manufacturing steps and costs can be reduced, the functional characteristics can be prevented from deteriorating due to aging, and the service life can be extended. The characteristics can be improved, and the practical effects of these are enormous.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view (side view) of an oil fan heater according to a first embodiment.

FIG. 2 is a longitudinal sectional view (front view) of the oil fan heater according to the first embodiment.

FIG. 3 is a vertical sectional view of the pump 3 according to the first embodiment.

FIG. 4 is a configuration diagram of a main part of the control system according to the first embodiment.

FIG. 5 is a longitudinal sectional view of a main part of a hot air device according to a second embodiment.

FIG. 6 is a configuration diagram of a main part of a control system according to a second embodiment.

FIG. 7 is a longitudinal sectional view of a hot water supply heat source device according to a third embodiment.

FIG. 8 is a configuration diagram of a main part of a control system according to a third embodiment.

FIG. 9 is a longitudinal sectional view of a conventional oil fan heater.

FIG. 10 is a configuration diagram of a main part of a conventional control system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air suction port 2 Suction port guard 3 Air fan 4 Blow duct 5 Hot air supply port 6 Temperature sensor A 7 Temperature sensor B 8 Fuel tank 9 Cartridge tank 10 Pump 12 Vaporizer 13 Fuel heating unit 14 Electric heater 15 Temperature sensor C 16 Solenoid valve 17 injection nozzle 18 return port 19 electromagnetic coil 21 combustor 23 mixing chamber 27 combustion cylinder 28 combustion space 29 heat conductor 41 cylinder 44 suction port 45 discharge port 46 plunger 49 discharge valve 52 electromagnetic coil 57 suction valve 71 pump drive power Control unit 72 Reference temperature setting unit 74 Air fan control unit 76 Heater power control unit 81 Main body 82 Fuel tank 83 Fuel supply pipe 84 Pump 87 Vaporizer 88 Heater 89 Temperature sensor C 90 Heat conductor 91 Mixing chamber 92 Combustor 96 Combustion space 97 Air supply fan 98 Air supply port 10 0 Exhaust fan 101 Heat exchanger 104 Air fan 105 Electric control unit 106 Temperature sensor A 107 Temperature sensor B 111 Room temperature setting unit 112 Air fan control unit 113 Reference temperature setting unit 114 Pump drive power control unit 115 Heater power control unit 116 Supply and exhaust Fan control unit 123 Pump 126 Vaporizer 128 Electric heater 129 Temperature sensor C 135 Combustor 141 Combustion cylinder 142 Air duct 146 Heat exchanger 148 Cold water pipe 149 Hot water supply pipe 150 Flowing water pressure switch 151 Temperature sensor B 152 Temperature sensor A 156 Reference temperature setting Unit 157 Pump drive power control unit 158 Heater power control unit 159 Hot water tap 160 Hot water pump 161 Three-way valve 162 Reference temperature setting unit 163 Bathtub

Claims (6)

[Claims] 1. A liquid fuel in a fuel tank is supplied to a combustion section by a pump, the fuel is burned in the combustion section, and a heat medium such as water or air is heated by the combustion heat to supply the liquid to the outside. In the fuel combustion device, the pump includes a pump capable of adjusting a fuel flow rate by adjusting driving power, and the combustion unit includes a combustion section capable of adjusting a combustion amount by adjusting a fuel flow rate. A temperature sensor A for detecting the temperature of the heat medium heated by the combustion heat generated in the combustion section; and a reference temperature setting section for setting an appropriate value of the heat medium temperature at the installation position of the temperature sensor A as a reference temperature. When the temperature detected by the temperature sensor A is lower than the reference temperature, the pump drive power is adjusted to increase the flow rate of the fuel supplied to the combustion unit, and the temperature detected by the temperature sensor A becomes lower than the reference temperature. If it turns, the pump drive power is adjusted to reduce the fuel flow supplied to the combustion section, and if the temperature detected by the temperature sensor A matches the reference temperature, the pump drive power is continued without being changed. And a pump driving power control unit for matching the detected temperature to a reference temperature. 2. In adjusting the pump driving power,
2. The liquid fuel combustion apparatus according to claim 1, further comprising an adjustment unit that repeatedly executes the detection temperature of the temperature sensor A according to a preset adjustment amount until the detected temperature matches the reference temperature. 3. In adjusting the pump driving power,
The larger the difference between the detected temperature of the temperature sensor A and the reference temperature is, the larger the adjustment amount is, and the smaller the difference is, the smaller the adjustment amount is.
2. The liquid fuel combustion apparatus according to claim 1, further comprising an adjusting unit that repeatedly executes until the temperature detected by the temperature sensor A matches the reference temperature. 4. In adjusting the pump driving power,
An error calorie of the combustion amount is calculated from the difference between the temperature detected by the temperature sensor A and the reference temperature, the flow rate of the heat medium, and the specific heat of the heat medium, and a fuel flow rate corresponding to the error heat quantity is calculated. Determine the pump drive power corresponding to the correction amount, 1
2. The liquid fuel combustion apparatus according to claim 1, further comprising adjusting means for correcting substantially all of the errors in each adjustment. 5. In adjusting the driving power of the pump,
2. The liquid fuel combustion apparatus according to claim 1, further comprising adjusting means for selecting and executing one of a plurality of drive powers set in advance. 6. A liquid fuel combustion apparatus according to claim 1, wherein said pump comprises an electromagnetic plunger pump for sucking and discharging fuel by reciprocating motion of a plunger driven by electromagnetic force.