JPH08200657A - Method for controlling combustion device having a proportional valve - Google Patents

Abstract

PURPOSE: To carry out an accurate and safe inspection and measuring work by a method wherein an increased or a decreased amount of water flowing into a heat exchanger is controlled in response to a detected temperature of a hot water feeding thermistor after an operation is changed over to a forced combustion mode when an inspection and a measurement are carried out. CONSTITUTION: When a sensed temperature of a hot water feeding thremistor 15 becomes a predetermined temperature or more when an inspection and a measurement are carried out, a degree of opening of a water flow control valve 17 is controlled to increase an amount of water flowing into a heat exchanger 3. As a result, since the temperature of the heat exchanger 3 is decreased, a boiling-up of the heat exchanger 3 is prevented. In addition, when a detected temperature of the hot water feeding thermistor 15 becomes a predetermined temperature or less, a degree of opening of the water flow control valve 17 is controlled so as to decrease an amount of water flowing into the heat exchanger 3. As a result, a temperature of the heat exchanger 3 is increased, so that a dew condensation in the heat exchanger 3 is prevented. With such an arrangement as above, accurate and safe inspection and measurement can be carried out without fixing a degree of opening of the water flow control valve 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of controlling a combustion apparatus having a gas proportional valve such as a water heater, and more particularly to a proportional valve with improved opening control of a water amount control valve in a forced combustion mode during inspection / measurement. The present invention relates to a method for controlling a combustion apparatus with a built-in combustion engine.

[0002]

2. Description of the Related Art Conventionally, a combustion apparatus having a gas proportional valve such as a water heater has an operation mode for performing proportional control and a forced combustion mode for adjusting / inspecting / measuring these values.
This inspection / measurement is performed for each unit at the time of shipment of a combustion device with a proportional valve. To set the gas pressure of the gas proportional valve,
The combustion amount was fixed by switching from the operation mode to the forced combustion mode with the changeover switch.

That is, at the time of inspection / measurement, the proportional combustion system is set to the forced combustion mode to cancel the proportional control system (operating mode) of the combustion apparatus, and the proportional valve is set to the maximum value (forced MAX: maximum value output from the combustion amount fixing means and all switching valves). On) and minimum value (forced M
IN: Minimum output from combustion amount fixing means and 1 switching valve on)
And were set by the gain control of the proportional valve control means.

The water amount control is controlled based on the remote control set temperature, the hot water supply thermistor and the theoretical combustion amount (FF amount).
Therefore, when the operation mode is switched to the forced combustion mode, the remote control set temperature and the input from the hot water supply thermistor to the water amount variable amount specifying means for issuing an operation command to the water amount control valve are stopped, and the water amount control valve keeps the current opening degree. It was meant to be maintained.

[0005]

In the forced combustion mode of the conventional combustion apparatus with a proportional valve, the gain control of the proportional valve control means controls the water quantity control valve regardless of the combustion quantity. The opening does not change.

Therefore, in a series of adjustments / inspections / measurements, which are mainly carried out at the time of product shipment, in order to avoid boiling of the heat exchanger at the maximum value, the worker makes the amount of water flowing through the heat exchanger relatively large. , The operation mode was switched to the forced combustion mode.

Therefore, in the inspection / measurement performed by switching to the forced combustion mode, dew condensation was likely to occur on the heat exchanger. The drain water contains nitric acid, and there is a problem that the nitric acid reacts with copper, which is a constituent material of the heat exchanger, and the reaction product is clogged between the fins.

Further, if water drops drop on the burner surface due to the generation of dew condensation, there is a problem that accurate inspection / measurement cannot be performed.

The present invention has been made to solve the above problems, and even if the forced combustion mode is switched at the time of inspection / measurement, the opening of the water flow control valve is not fixed and the condensation and boiling of the heat exchanger are achieved. It is an object of the present invention to provide a method for controlling a combustion device with a proportional valve, which can prevent the above-mentioned problems and can perform inspection and measurement work accurately and safely.

[0010]

According to the present invention, there is provided a control method for a combustion apparatus with a proportional valve for fixing a combustion amount in a forced combustion mode at the time of inspection / measurement by switching to the forced combustion mode. After that, when the detected temperature of the hot water supply thermistor exceeds a predetermined temperature, the control method of the water quantity control means is used to increase the quantity of water flowing into the heat exchanger. To be done.

Further, the above object is to provide a method for controlling a combustion apparatus with a proportional valve, in which a combustion amount is fixed in a forced combustion mode during inspection / measurement, after the forced combustion mode is switched to, the temperature detected by the hot water supply thermistor is predetermined. This is achieved by a control method of a combustion apparatus with a proportional valve, which controls the water amount control means to reduce the amount of water flowing into the heat exchanger when the temperature falls below the temperature.

Preferably, the output of the hot water supply thermistor is branched and one of them is input to a circuit for obtaining a deviation from the remote controller, and the other is input to an inspection dew condensation prevention means / boiling prevention means to prevent inspection dew condensation. This is achieved by a control method of a combustion apparatus with a proportional valve, in which an instruction is issued from the means / boiling prevention means to the variable water amount specifying means, and the variable water amount specifying means controls the water amount control means.

Further, preferably, the output of the hot water supply thermistor is input to a safety device in which a control condition is set in advance, and this safety device issues an instruction to the water amount variable amount designating means, which water amount variable amount designating means. Is achieved by a method for controlling a combustion apparatus with a proportional valve that controls the above.

Further, preferably, a control signal of an external control device connected to an external input terminal is input to the water amount control means, and the amount of water flowing into the heat exchanger is controlled to an appropriate amount. It is achieved by the control method of.

[0015]

According to the above construction, when the detected temperature of the hot water supply thermistor becomes equal to or higher than the predetermined temperature after switching to the forced combustion mode, the opening of the water amount control means is controlled to increase, and as a result, the heat exchanger is changed. The amount of water flowing in increases. When the amount of water flowing into the heat exchanger increases, the temperature of the heat exchanger decreases, so that boiling of the heat exchanger is prevented.

Further, when the detected temperature of the hot water supply thermistor becomes equal to or lower than a predetermined temperature after switching to the forced combustion mode, the opening of the water amount control means is controlled so as to decrease, and as a result,
The amount of water flowing into the heat exchanger is reduced. When the amount of water flowing into the heat exchanger decreases, the temperature of the heat exchanger rises, so that dew condensation is prevented.

When the water amount control means is controlled under the above control conditions to prevent boiling or dew condensation of the heat exchanger, the output of the hot water supply thermistor is branched, and one is to a circuit for obtaining the deviation from the remote control. In addition to the input, the other is input to the inspection dew condensation prevention means / boiling prevention means. Then, the inspection dew condensation prevention means / boiling prevention means issues an instruction to the water amount variable amount specifying means, and the water amount variable amount specifying means controls the water amount control means.

Further, the above control conditions are input in advance to the safety device, and the output of the hot water supply thermistor is input to this safety device. Then, the safety device gives an instruction to the water amount variable amount specifying means, and the water amount variable amount specifying means controls the water amount control means.

Furthermore, an external control device is connected to the external input terminal, and a control signal is input from the external control device to the water amount control means. The above-mentioned control conditions are input to this external control device in advance, the water amount control means is controlled based on the control signal, and the inflow water amount of the heat exchanger becomes an appropriate amount.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In addition, since the Examples described below are preferred specific examples of the present invention, various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. The embodiment is not limited to these embodiments unless otherwise stated.

The control method of the combustion apparatus with a proportional valve according to the present embodiment is carried out for an apparatus example as shown in FIG. First, FIG. 1A is a system diagram showing a capacity-switching type water heater as a combustion apparatus with a proportional valve. As shown in the figure, the water supply pipe 1 has a water amount sensor 6 for detecting the amount of water flowing into the water supply pipe 1.
And the incoming water temperature thermistor 16 for detecting the temperature of the inflowing water
And the water supply pipe 1 are connected to the inlet side of the hot water heat exchanger 3.

A hot water supply pipe 4 through which hot water heated by the hot water supply heat exchanger 3 passes is connected to the outlet side of the hot water supply heat exchanger 3. The hot water supply pipe 4 is provided with a hot water supply thermistor 15 that detects the outlet temperature of the hot water heat exchanger 3 and a water amount control valve 17 that adjusts the amount of water.

Further, a burner 2 for burning the combustible gas supplied from the gas supply passage 19 is provided in the vicinity of the hot water supply heat exchanger 3, and the burner 2 switches between the A surface and the B surface in order to switch the combustion capacity. It is divided into

A gas source solenoid valve 8 and a proportional valve 10 are provided in the gas supply passage 19. This gas supply passage 19
The tip end side is branched and connected to the A surface and the B surface of the burner 2, and switching valves 11a and 11b are provided respectively.

An igniter electrode 12 for igniting the burner 2 and a frame rod electrode 13 for detecting the flame of the burner 2 are provided. Further, a fan 7 for blowing combustion air to the burner 2 is provided on the rear side of the burner 2, and the fan 7 is provided with a rotation speed sensor 9. The water heater 30 is equipped with the control device 5 connected to the remote controller 14.

In the water heater 30 configured as described above, the water flowing from the water supply pipe 1 is heated by the combustion heat of the burner 2 when passing through the hot water heat exchanger 3 to become hot water. It passes through the pipe 4 and is guided to a hot water supply place such as a kitchen.

Upon receiving the water input signal from the water amount sensor 6, the control device 5 rotates the fan 7 to open at least one of the gas source solenoid valve 8, the proportional valve 10 and the switching valves 11a and 11b in the gas supply passage 19. The igniter connected to the igniter electrode 12 is driven to perform point ignition.

Subsequently, the control device 5 detects the flame of the burner 2 by the frame rod electrode 13, and then the proportional valve 10 so that the hot water supply temperature detected by the hot water supply thermistor 15 becomes the set temperature set by the remote controller 14. The valve opening amount is controlled, and at the same time, the rotation control of the fan 7 is controlled according to the combustion amount to control the hot water supply operation. In controlling the hot water supply operation, the control device 5 controls switching of the switching valves 11a and 11b according to the required heat amount.

When the required heat amount is small, only the switching valve 11a is opened to perform one-side combustion of the A side of the burner 2, and when the required heat amount is large, the switching valve 11b is opened and the A face and B side of the burner 2 are opened.
It is designed to perform multi-sided burning of surfaces.

FIG. 1 (b) is a system diagram showing a combined water heater having a reheating function as a combustion device with a proportional valve. As shown in the figure, on the side of the hot water heat exchanger 3 is shown in FIG.
The hot water supply operation is performed by performing the same operation as that shown in (1), and the reheating heat exchanger 23 side reheats the inside of the bath 21. In addition, in FIG. 1B, FIG.
The same reference numerals are given to the same devices.

As shown in the figure, the water supply pipe 1 and the hot water supply pipe 4 side are constructed in the same manner as in FIG. 1B, and the hot water supply pipe 4 is connected to a reheating circulation pipe line 18 via a branch pipe 27. ing. The branch pipe 27 has an electromagnetic pouring valve 2 for opening and closing the branch pipe 27.
5 and a water level sensor 26 such as a pressure sensor that detects the water level in the bath 21 are interposed.

The reheating circulation pipe line 18 is annularly connected between the bath 21 and the reheating heat exchanger 23, and has a bath thermistor 24 for detecting the temperature of the hot water in the bath 21.
A running water switch 22 for detecting that hot water in the bathtub 21 has been drawn into the additional heating circulation line 18 and a circulation pump 20 for drawing the hot water in the bathtub 21 and circulating it in the additional heating circulation line 18 are provided. ing.

As in the hot water supply heat exchanger 3, the reheating heat exchanger 23 is provided with the burner 2 and its accessories.

The combined water heater 31 configured as described above
The hot water supply operation is performed by the same operation as that of the water heater 30 shown in FIG. 1A, but the reheating operation is performed as follows. When the reheating operation is instructed by the remote controller 14 or the like, the control device 5 rotates the circulation pump 20 of the reheating circulation line 18 to circulate the hot and cold water in the bath 21 into the reheating circulation line 18.

When the running water switch 22 detects the flow of hot and cold water, the controller 5 rotates the fan 7 to open the gas source solenoid valve 8 and burns the burner 2 by point ignition to turn on the reheating heat exchanger 23. The circulating water passing therethrough is heated to reheat the hot water in the bath 21. Then, when the bath temperature detected by the bath thermistor 24 reaches the bath set temperature set by the remote controller 14, the reheating operation is stopped.

These hot water supply and reheating operations are performed by the control device 5, which opens the electromagnetic pouring valve 25 to reheat the hot water produced on the hot water supply heat exchanger 3 side and recirculate the circulation line 18. It is equipped with a function for dropping water into the bathtub 21 via the water tank, and the electromagnetic pouring valve 25 is closed when the water level sensor 26 reaches the set water level set by the remote controller 14 or the like. The hot water filling is stopped, the circulation pump 20 is then started, and the reheating operation is performed.

Each operation unit, detection unit, etc. of the above device example is connected to the control unit 5, and a remote controller 14 is connected to the control unit 5. FIG. 2 shows a main device configuration relating to the control device 5, and illustrates all configuration examples corresponding to the first to third embodiments.
The control method of the combustion apparatus with the proportional valve according to the present invention is realized by such an apparatus configuration.

That is, in FIG. 2, in the control device 5, a combustion quantity designating means 51, a combustion quantity fixing means 52, a rotation speed designating means 53, a fan control means 54, a fuel control means (proportional valve control means) 55, Condensation prevention means / boiling prevention means 5
6. A water quantity variable quantity designating means 57 and a water quantity controlling means 58 are built in, and a safety device 59 is attached.

Specifically, the remote controller 14 is connected to the combustion amount designating means 51, and the incoming water temperature thermistor 16 and the water amount sensor 6 are connected to the combustion amount designating means 51, and respective detection signals are inputted. .

Further, the combustion amount designating means 51 is connected to one of the changeover switches 60 for switching between the operation mode and the forced combustion mode, and the combustion amount is forced MAX, forced MID, forced MIN on the side of the forced combustion mode. Combustion amount fixing means 52 for fixing to is connected. The switching valves 11a and 11b are connected to the combustion amount fixing means 52, and the switching valve 11
A control signal is output to a and 11b.

Further, the other of the changeover switch 60 is branched and connected to the rotation speed designating means 53 and the fuel control means 55. The fan control means 5 is provided in the rotation speed designating means 53.
4 and the fan 7 are sequentially connected, and a control signal is output to the fan 7. On the other hand, the fuel control means 55 is capable of gain control 55a.
Is connected to the proportional valve 10 via a delay circuit 61 and switching valves 11a and 11b, and a control signal is output to each of them.

The rotation speed of the fan 7 is input from the rotation speed sensor 9 to the fan control means 54 and the delay circuit 61.

Further, the water amount sensor 6 is connected to the safety device 59 so as to input the detection signal thereof. Further, the hot water supply thermistor 15 is connected to the safety device 59, and a detection signal thereof is input. The hot water supply thermistor 15 is also connected to the remote controller 14 and receives a detection signal thereof. The safety device 59 is connected to the gas source solenoid valve 8 and outputs a safety control signal to the gas source solenoid valve 8.

The remote controller 14 and the combustion amount designating means 5
The circuit connecting 1 and 1 is branched and connected to the water amount variable amount designation means 57. The water amount variable amount designation means 57 is connected to the water amount control means 58 and the water amount control valve 17, and a control signal is output to the water amount control valve 17. The fully open detection 62 of the water amount control valve 17 is fed back to the water amount control means 58.

In the case of the first embodiment, the circuit connecting the remote controller 14 and the hot water supply thermistor 15 is branched and connected to the dew condensation prevention means / boiling prevention means 56, and the detection signal of the hot water supply thermistor 15 is dew condensation prevention means / boiling prevention. It is input to the means 56. The dew condensation prevention means / boiling prevention means 56 is further sequentially connected to a water amount variable amount designation means 57 and a water amount control means 58.

That is, in the control method of the first embodiment, in the forced combustion mode, the input to the water amount variable amount designating means 57 is compared with the conventional one which is based on the deviation of the set temperature of the remote controller 14 and the hot water supply thermistor 15. The signal of the hot water supply thermistor 15 is branched to dew condensation prevention means / boiling prevention means 5 for inspection.
6 is used to input to the variable water amount designating means 57, and the input to these means is linked to the forced combustion mode to solve the prevention of dew condensation and boiling of the heat exchanger.

Further, in the case of the second embodiment, the control conditions to be described later are previously input to the safety device 59, and the safety device 59 is sequentially connected to the water amount variable amount designation means 57 and the water amount control means 58. There is.

That is, in the control method of the second embodiment, the circuit used for the normal control of the combustion apparatus is linked with the forced combustion mode to change the constant and the connection destination, so that the condensation and boiling of the heat exchanger can be prevented. It is a solution to prevention.

Further, in the case of the third embodiment, an external inspection control device (not shown) is in an inspection mode (GEMS mode: a mode in which a device control command is sent from outside via communication to control device components). 63 is connected via an external terminal, and the control signal is input to the water amount control means 58 via GEMS 63. Control conditions, which will be described later, are input in advance to this external control device.

That is, the control method of the third embodiment is the GE
This is to prevent the dew condensation and boiling of the heat exchanger by controlling the combustion device through the communication line from the external control device side via the MS 63.

In order to improve the understanding of the present invention, the background of the present invention will be described based on the background of conventional products.
Conventionally, it has been decided whether to increase or decrease the combustion amount based on the deviation between the set temperature from the remote controller 14 and the current hot water discharge temperature (hot water supply thermistor 15) (feedback control). This deviation is input to the combustion amount designating means 51, information from the incoming water temperature thermistor 16 and the water amount sensor 6 (feedforward control) is also taken in, and an output (for example, a number) that determines the rotation speed of the fan and the proportional valve current is output. Then, based on this output, the rotation speed designating means 53 and the fuel control means 55 control the fan 7 and the proportional valve 10 in a form based on the execution mode.

At this time, the rotational speed of the fan 7 is corrected and controlled by the feedback of the rotational speed sensor 9 of the fan 7, and at the same time, in order to prevent the combustion failure due to the reaction speed difference between the fan 7 and the proportional valve 10, the proportional valve 10 is operated. A delay circuit 61 for controlling the control according to the rotation speed of the fan 7 is provided.

Further, the combustion control means 55 is provided with a gain control 55a for correcting variations in the gas type and the proportional valve 10 with respect to the output from the combustion quantity designating means 51. The gain control 55a was performed for each device when the device was shipped. This gain control 55a forcibly outputs the maximum value and the minimum value from the combustion amount fixing means 52 instead of the signal output from the combustion amount designating means 51, and the remote controller 14, the hot water supply thermistor 15,
The soft input from the incoming water temperature thermistor 16 is ignored.

In the case of the present invention, as shown in FIG. 2, the output from the combustion amount fixing means 52 has three stages. That is, forced MAX: maximum value output from combustion amount fixing means and all switching valves turned on, forced MIN: minimum output from combustion amount fixing means and 1
Switching valve ON, forced MID: There are three stages: minimum output from combustion amount fixing means and all switching valves ON.

Hot water supply thermistor 15 / input water temperature thermistor 1
In addition to the soft input to the CPU from 6, there is also a hard input to the safety device 59. These are, for example, the hot water supply thermistor 1
When 5 indicates 98 degrees Celsius or higher, or when the water amount sensor 6 indicates 3 liters / min or lower, combustion is stopped regardless of control. Therefore, in the conventional product shipping stage, it was convenient that the gain control 55a of the combustion apparatus could be performed under a fairly rough condition as long as these hard inputs were not touched.

However, in recent years, conditions such as shipment of the product in a more advanced state and NOx measurement with forced MID are added, and in order to solve these problems, the opening degree of the water amount control valve 17 in the forced combustion mode becomes a situation. The present invention is capable of changing in a corresponding manner.

That is, in the control method of the first embodiment, the signal of the hot water supply thermistor 15 is branched, one is input to the circuit for obtaining the deviation from the conventional remote controller 14, and the other is newly formed dew condensation preventing means for inspection. By inputting to the boiling prevention means 56, an instruction is given to the water amount variable quantity designation means 57 from now on.

Further, in the control method of the second embodiment, the control condition of the safety device 59 which has been conventionally equipped is changed, and the instruction is given from the gas source solenoid valve 8 to the water amount variable amount designation means 57. By changing it, the same effect as that of the first embodiment can be obtained.

Furthermore, the control method of the third embodiment is based on the GE
The same effect as in the first and second embodiments is obtained by externally adjusting the opening of the water quantity control valve 17 using the MS 63 (by controlling to an appropriate water quantity by an external control device). Is.

In the water amount variable amount designating means 57 described above, the water amount control valve 17 is operated by the given input amount. Specifically, in the case of the No. 24 water heater, the opening degree of the water amount control valve 17 is adjusted so that the target water amount shown by No. 24 × 0.9 ÷ (remote control set temperature−inlet water temperature thermistor temperature) × 25 is obtained. When the input (remote control set temperature-hot water supply thermistor temperature) to the water amount variable amount designating means 57 becomes a certain value or less, the opening amount is adjusted in inverse proportion to the input to specify the water amount variable amount. When the input to the means 57 is kept at a certain value and the target water amount is reached, the water amount control valve 17 is stopped.

When the water amount control valve 17 is instructed to be fully opened during the adjustment of the water amount control valve 17, the water amount control valve is in the fully open position, and even if it is further energized. The motor is in a state of not rotating, and therefore, even if there is an instruction from the water amount variable amount designating means 57, the energization of the water amount control valve 17 is stopped.

The control method of the combustion apparatus with a proportional valve according to the present invention will be specifically described below together with the inspection / measurement procedure. First, the inspection and measurement of the water heaters 30 and 31 are performed based on the procedure shown in the flowcharts of FIGS. That is, in step 101 of FIG. 3, the operation switch of the remote controller 14 of the water heater 30, 31 is turned on, and step 102
Then, the changeover switch 60 of the combustion amount fixing means 52 is switched to the minimum mode instruction (MIN instruction) from the outside, and step 1
In 03, the initial setting value of the minimum valve opening drive current corresponding to the minimum valve opening amount is read from an external database (not shown),
The value is written in the proportional valve drive current memory unit (not shown) as the minimum valve drive current initial setting value.

Next, at step 104, the changeover switch 60 of the combustion amount fixing means 52 is switched to the maximum mode instruction (MAX instruction), and at step 105, the maximum valve opening amount corresponding to the maximum valve opening amount corresponding to the maximum valve opening amount is output from the external database as described above. The initial setting value of the valve opening drive current is read, and the value is written in the proportional valve driving current memory section as the maximum valve opening drive current initial setting value.

Then, in step 106, the changeover switch 60 is switched to the operation instruction, and in step 107, the electromagnetic solenoid valve (not shown), which is an electromagnetic valve (not shown) between the instrument water supply pipe 1 and the water inlet device, is turned on in the inspection line. Water heater 30,31
Start the combustion operation. At this time, the water heater 30,
Check 31 for any abnormalities such as gas leaks.

Then, in step 108, the changeover switch 60 is changed over to the MAX instruction in the same manner as described above, and the changeover switch 60 is set to the MAX instruction in this way to operate the water heaters 30 and 31 with the maximum combustion capacity. .

Next, in step 109, the gas pressure (primary pressure) of the instrument is measured using a gas governor (not shown) and a gas pressure gauge connected between the instrument gas supply path 19 and the gas pipeline in the inspection line. Feedback control (FB) the value, step 1
The inlet pressure (primary pressure) of the appliance gas supply path, which fluctuates during the adjustment performed in 10, is made constant. For example, in the case of 13A gas type, the value is set to be 200 mmAq.

Then, in step 110 of FIG. 4, based on the gas flow rate detection by a gas flow rate sensor (not shown) connected in series with the instrument gas supply path 19 and the gas governor connected in the gas pipe in the inspection line. , Calculates the heat of combustion during the combustion operation with the maximum combustion capacity of the water heaters 30 and 31, and determines whether the calculation result is within the tolerance range of the maximum combustion heat read from the tolerance memory unit (not shown). Judgment is made by the comparison judgment unit (not shown), and the valve drive current set by the valve drive current setting unit (not shown) is adjusted while being sequentially corrected until the calculated value falls within the tolerance range of the maximum combustion heat quantity. The valve opening amount of the proportional valve 10 is variably adjusted by the gain control 55a.

When the calculated value is within the tolerance range of the maximum combustion heat quantity, the valve drive current at that time is set as the maximum valve drive current in step 111, and the proportional valve drive current memory for the water heaters 30 and 31 is set. Write in a section (not shown). In addition,
During such valve drive current adjustment (during adjustment of the valve opening amount of the proportional valve 10), the detected value of the pressure gauge changes, but this value is always 2
The maximum valve opening drive current is adjusted so that it becomes 00 mmAq.

Next, at step 112, the changeover switch 60 of the combustion amount fixing means 52 is set to the MIN instruction. As described above, by instructing the operation mode changeover switch to MIN, the water heaters 30 and 31 perform combustion with the minimum combustion capacity.

Then, in step 113, the governor attached outside the instrument gas supply path 19 is adjusted to adjust the opening so that the pressure of the pressure gauge becomes 200 mAq.

Further, in step 114, the water heater 3 is based on the gas flow rate detection value detected by the gas flow rate sensor.
The combustion heat quantity at the time of combustion operation with the minimum combustion capacity of 0, 31 is calculated, and the heat quantity comparison and judgment section compares and judges whether or not the calculated value falls within the tolerance range of the minimum combustion heat quantity read from the tolerance memory section, The valve opening amount of the proportional valve 10 is variably adjusted by the gain control 55a by sequentially correcting the valve driving current set by the valve driving current setting unit until the calculated value falls within the tolerance range of the minimum combustion heat amount.

When the calculated value falls within the tolerance range of the minimum heat of combustion, the valve drive current at that time is set as the minimum valve drive current in step 115 and stored in the proportional valve drive current memory section of the water heaters 30 and 31. Write. Also at this time, similarly to the above, during the valve drive current adjustment (during adjustment of the valve opening amount of the proportional valve 10), the detected value of the pressure gauge changes, but this value is always 2
The minimum valve opening drive current is adjusted while adjusting the opening so as to be 00 mmAq.

Further, at step 116, the changeover switch 60 of the combustion amount fixing means 52 is switched to the intermediate mode instruction (MID instruction), then at step 117, the primary adjustment of the gas pressure supply pressure is performed, and at step 118, Measure NOx.

In step 119, the changeover switch 60 is again instructed to MAX in the same manner as described above, so that the combustion device burns at the maximum combustion capacity.

Then, in step 120, the opening of the primary pressure of the gas supply pressure is adjusted by the gas governor so that the gas pressure detected by the pressure gauge becomes constant, and in step 121, the water heaters 30 and 31 have the maximum combustion capacity. When performing combustion operation in
Whether the operation is performed with the valve opening amount of the proportional valve 10 set based on the maximum valve opening driving current stored in the proportional valve driving current memory unit is confirmed by the flow rate of the gas flow rate sensor, and the operation is performed as set. If not, step 11
Returning to 0, the operation from step 110 to step 121 is repeated.

When it is confirmed in step 121 that the water heaters 30 and 31 have been operated as set, in step 123, the changeover switch 60 of the combustion amount fixing means 52 is set to the MIN instruction, and in step 124, it is supplied. The primary pressure of the gas supply pressure is adjusted with a gas governor so that the primary pressure of the gas becomes constant.

Then, in step 125, the water heater 30,
When the combustion operation is not performed according to the setting when the combustion operation is performed with the minimum combustion capacity of 31 and the combustion operation is not performed according to the setting, the process returns to step 114 and the operations from step 114 to step 125 are repeated to perform the combustion operation according to the setting. If so, proceed to step 126 of FIG.

After the maximum valve opening drive current is set in step 111 and the minimum valve opening drive current is set in step 115, steps 121 and 12 are performed.
By checking whether or not the combustion operation is performed based on the above-mentioned set valve opening drive current in 5, the adjustment of the other side can be made even when adjusting one side of the maximum valve opening drive current and the minimum valve opening drive current. Even if the deviation occurs, the adjustment is performed again at that time so that the maximum and minimum valve opening drive currents can be accurately set.

By the above operation, the water heaters 30, 3
The maximum opening drive current of the proportional valve 10 is set so that the calculated value when operating with the maximum combustion capacity of 1 falls within the tolerance range of the maximum heat of combustion of the water heaters 30 and 31, and the set maximum When the maximum valve opening amount of the proportional valve 10 is controlled on the basis of the valve opening drive current to perform the combustion operation with the maximum combustion capacity, similarly, when the water heaters 30 and 31 are operated with the minimum combustion capacity, The minimum valve opening drive current of the proportional valve 10 is set so that the calculated value falls within the tolerance range of the minimum combustion heat quantity of the combustion device,
When it is confirmed that the valve opening amount of the proportional valve 10 is controlled based on the set minimum valve opening drive current and the combustion operation with the minimum combustion capacity is performed, in step 126 of FIG. The changeover switch 60 is switched to a driving instruction.

Then, in step 127, the water heater 30,
The water entry solenoid valve 31 is turned off, and the adjusting operation of the proportional valve 10 is completed. If the hot water heater 30, 31 does not perform the combustion operation as set even after repeating the proportional valve adjusting operation, it is determined that the water heater has an abnormality, and an inspection of the abnormal portion is performed.

In the flow chart showing the inspection / measurement procedure of the water heaters 30 and 31 as described above, the present invention is carried out as a subroutine. First, the manufacturing method of the first embodiment is connected to step 102 of the above flowchart as a subroutine shown in FIG. As mentioned above, the first
In the manufacturing method of the embodiment, the output of the hot water supply thermistor 15 is branched and one of the outputs is input to the circuit for obtaining the deviation from the remote controller 14, and the other is input to the inspection dew condensation prevention means / boiling prevention means 56 for dew condensation. The prevention means / boiling prevention means 56 gives an instruction to the variable water quantity designating means 57, and the variable water quantity designating means 57 controls the water quantity control means 58.

As shown, steps 102, 10
When the forced combustion mode is switched at 4, 108, 112, 116, 119, and 123, the detected temperature of the hot water supply thermistor 15 is input to the dew condensation preventing means / boiling preventing means 56. When the temperature exceeds 60 degrees Celsius, in step 142, the dew condensation prevention means / boiling prevention means 56 issues an opening instruction to the water amount variable amount designation means 57, and the water amount variable amount designation means 57 controls the water amount control means 58. . As a result, by the water amount control means 58,
The water amount control valve 17 is opened to increase the amount of water flowing into the hot water supply heat exchanger 3 to prevent its boiling. Even after the water flow control valve 17 is opened, the step 1
Returning to 41, the temperature detected by the hot water supply thermistor 15 is monitored.

On the other hand, in step 143, when the temperature detected by the hot water supply thermistor 15 is less than 60 degrees Celsius and is 50 degrees Celsius or less, in step 144, the water amount variable amount from the condensation prevention means / boiling prevention means 56 is changed. A closing instruction is issued to the designating means 57, and the variable water quantity designating means 57 controls the water quantity control means 58. As a result, the water amount control means 58 closes the water amount control valve 17, reduces the amount of water flowing into the hot water supply heat exchanger 3, and prevents dew condensation. Even after the water amount control valve 17 is closed, the process returns to steps 141 and 143 to monitor the temperature detected by the hot water supply thermistor 15.

In step 143, when the temperature detected by hot water supply thermistor 15 is less than 60 degrees Celsius and exceeds 50 degrees Celsius, the process returns to step 141.

Next, in the manufacturing method of the second embodiment, the flow chart shown in FIG. 7 is connected as a sub-routine to steps 102, 112 and 116 of the above-mentioned flow chart, and the steps 104, 108, 111 and 119 are performed as shown in FIG.
The flowchart shown in is connected as a subroutine. As described above, according to the manufacturing method of the second embodiment, the output of the hot water supply thermistor 15 is input to the safety device 59 in which the control conditions are set in advance, and the safety device 59 issues an instruction to the water amount variable amount designating means 57, and this The water amount variable amount designation means 57 controls the water amount control means 58. The control conditions input to the safety device 59 are the flowcharts shown in FIGS. 7 and 8.

As shown in FIG. 7, steps 102, 11
When the forced combustion mode is switched at 2 and 116, the detected temperature of the hot water supply thermistor 15 is input to the safety device 59. Therefore, at step 151, when the detected temperature becomes 50 degrees Celsius or less, at step 152. , Safety device 59
Outputs a closing instruction to the water amount variable amount designating means 57, and the water amount variable amount designating means 57 controls the water amount control means 58. As a result, the water amount control means 58 closes the water amount control valve 17, reduces the amount of water flowing into the hot water supply heat exchanger 3, and prevents dew condensation. Even after the water amount control valve 17 is closed, the process returns to step 151 and the detected temperature of the hot water supply thermistor 15 is monitored.

On the other hand, when the detected temperature of hot water supply thermistor 15 exceeds 50 degrees Celsius in step 151, the determination in step 151 is repeated.

Further, as shown in FIG.
When the forced combustion mode is switched at 4, 108, 111, and 119, the temperature detected by the hot water supply thermistor 15 is changed to the safety device 5.
9 is input, so when the detected temperature becomes 60 degrees Celsius or more in step 161, step 162
Then, the safety device 59 gives an instruction to open to the water amount variable amount designating means 57, and the water amount variable amount designating means 57 causes the water amount controlling means 58.
Control. As a result, the water amount control means 58 opens the water amount control valve 17 to increase the amount of water flowing into the hot water supply heat exchanger 3 and prevent boiling thereof. Even after the water amount control valve 17 is opened, step 16
Returning to 1, the temperature detected by the hot water supply thermistor 15 is monitored.

On the other hand, when the detected temperature of hot water supply thermistor 15 is less than 60 degrees Celsius in step 161, the determination in step 161 is repeated.

Next, in the manufacturing method of the third embodiment, as described above, the GEMS 63 of the controller 5 of the water heaters 30 and 31 is used.
A control signal from an external control device for inspection is input through the communication line via the communication line, and the water amount control means 58 is supplied by the control signal.
Is controlled. In the case of the manufacturing method of the third embodiment, the control conditions of the first embodiment shown in FIG. 6 and the control conditions of the second embodiment shown in FIGS. 7 and 8 must be input in advance to the external control device. Then, the control device 5 of the water heaters 30 and 31 receives the control condition from the external control device through the communication line.

Therefore, the inspection / measurement flowcharts shown in FIGS. 3 to 5 are also input to the external control device side in advance, and the control device 5 performs the inspection / measurement based on the control signal from the communication line. Become.

As described above, according to the first to third embodiments, the water quantity control valve 1 is controlled at the time of inspection / measurement based on the control conditions of FIGS. 6 to 8 and is switched to the forced combustion mode.
The opening of 7 is not fixed, the dew condensation of the hot water heat exchanger 3 is minimized, the boiling is also prevented, the inspection and measurement can be performed safely, and the drop of water drops on the burner surface due to the occurrence of dew condensation. There is no such thing, and accurate inspection / measurement is possible.

The present embodiment has been described by taking the water heaters 30 and 31 as an example of the combustion device with a proportional valve, but the present invention is not limited to this, and the proportional valve 1 which requires setting of gas pressure is used.
It goes without saying that the present invention can be applied to other combustion devices as long as it has 0.

[0094]

As described above, according to the control method for a combustion apparatus with a proportional valve according to the present invention, the opening of the water control valve is fixed even if the forced combustion mode is switched during inspection / measurement. It is possible to prevent dew condensation and boiling of the heat exchanger, and it is possible to perform an accurate and safe inspection / measurement work.

[Brief description of drawings]

FIG. 1 is an example of a target device of a control method for a combustion device with a proportional valve according to the present invention, (a) is a system diagram showing a capacity-switching type water heater, and (b) is a combined water heater having a reheating function. FIG.

FIG. 2 is a system diagram showing a main device configuration of a control device 5 for performing a control method for a combustion device with a proportional valve according to the present embodiment.

FIG. 3 is an explanatory diagram showing a flowchart of inspection / measurement procedures of a water heater.

FIG. 4 is an explanatory diagram showing a flowchart following FIG.

5 is an explanatory diagram showing a flowchart following FIG.

FIG. 6 is an explanatory diagram showing a flowchart of control conditions for preventing dew condensation and boiling in the control method of the first embodiment.

FIG. 7 is an explanatory diagram showing a flowchart of control conditions for preventing dew condensation in the control method of the second embodiment.

FIG. 8 is an explanatory diagram showing a flowchart of control conditions for boiling prevention in the control method of the second embodiment.

[Explanation of symbols]

 1 Water Supply Pipe 2 Burner 3 Hot Water Heat Exchanger 4 Hot Water Supply Pipe 5 Control Device 6 Water Volume Sensor 7 Fan 8 Gas Source Solenoid Valve 9 Rotation Speed Sensor 10 Proportional Valve 11a, 11b Switching Valve 12 Igniter Electrode 13 Frame Rod Electrode 14 Remote Controller 15 Hot Water Thermistor 16 Input Water Temperature Thermistor 17 Water Volume Control Valve 18 Reheating Circulation Pipeline 19 Gas Supply Passage 20 Circulation Pump 21 Bathtub 22 Running Water Switch 23 Reheating Heat Exchanger 24 Bath Thermistor 25 Electromagnetic Hot Water Valve 26 Water Level Sensor 27 Branch Pipe 30 Capacity Switchable Water heater 31 Combined water heater 51 Combustion amount designating means 52 Combustion amount fixing means 53 Rotation number designating means 54 Fan control means 55 Fuel control means (proportional valve control means) 55a Gain control 56 Dew condensation prevention means / boiling prevention means 57 Water amount variable quantity Designating means 58 Water quantity controlling means 59 All device 60 the selector switch 61 the delay circuit 62 fully open detection 63 GEMS

Claims (5)

[Claims] 1. A method of controlling a combustion apparatus with a proportional valve, which sets a combustion amount in a forced combustion mode during inspection / measurement, wherein the detected temperature of a hot water supply thermistor becomes a predetermined temperature or higher after switching to the forced combustion mode. In this case, the control method of the combustion apparatus with a proportional valve is characterized by controlling the water amount control means to increase the amount of water flowing into the heat exchanger. 2. A method for controlling a combustion device with a proportional valve, which sets a combustion amount in a forced combustion mode during inspection / measurement, wherein the hot water supply thermistor detects a temperature below a predetermined temperature after switching to the forced combustion mode. In this case, the control method of the combustion apparatus with a proportional valve is characterized in that the water quantity control means is controlled to reduce the quantity of water flowing into the heat exchanger. 3. The output of the hot water supply thermistor is branched,
One of them is input to the circuit that calculates the deviation from the remote control, and the other is input to the inspection dew condensation prevention means / boiling prevention means, and the dew condensation prevention means / boiling prevention means issues an instruction to the water amount variable amount specifying means. The method for controlling a combustion apparatus with a proportional valve according to claim 1 or 2, wherein the variable quantity designating means controls the water quantity controlling means. 4. The output of the hot water supply thermistor is input to a safety device in which control conditions are set in advance, the safety device issues an instruction to a water amount variable amount designation means, and the water amount variable amount designation means controls the water amount control means. The method for controlling a combustion apparatus with a proportional valve according to claim 1 or claim 2 configured as above. 5. The water amount control means receives a control signal from an external control device connected to an external input terminal to control the amount of water flowing into the heat exchanger to an appropriate amount. A method for controlling a combustion device with a proportional valve according to the description.