JP3346112B2 - Combustion control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion control device used for a hot oil heater or the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a petroleum hot air heater of this type is a main body case 1 having a tank 2 holding liquid fuel at a lower portion thereof and a detachable upper portion of the tank 2. A cartridge tank 3 is provided, and the tank 2 is provided with an oil level detecting means 4 such as a float type for detecting the oil level of the fuel inside. Reference numeral 5 denotes a pump mounted on the upper surface of the tank 2, and supplies a fuel from an upper end thereof to an evaporator 7, which is kept at a predetermined temperature or higher by a heater 8 and a temperature detector 9 via an oil supply pipe 6. I have. Numeral 10 is a nozzle disposed at the tip of the vaporizing section 7 for mixing the fuel gas vaporized by the vaporizing section 7 horizontally away from the vaporizing section 7 and sucking primary air by its ejector effect. Spout into the tube 11.

[0003] Reference numeral 12 denotes a line-shaped burner unit integrated with the mixing tube 11 for burning the mixed gas from the mixing tube 11 and, near the burner unit, a frame electrode 13 placed in a combustion flame.
And a flame rod type combustion sensor 14 for applying a voltage to the burner section 12 and measuring the amount of flowing current to detect a combustion state. Numeral 15 denotes a combustion tube for guiding the combustion exhaust gas from the burner section 12 upward, and a blower 16 for taking in and sending out the indoor air flow is disposed behind the combustion cylinder. Reference numeral 17 denotes a duct which mixes the combustion gas from the combustion tube 15 with the indoor air flow from the blower 16 to generate hot air.

As shown in FIG. 6, reference numeral 18 denotes a pump 5,
A control unit that drives and controls the heater 8, the blower 16, and the like, and is determined in advance based on the operating condition signal input from the operation unit 19, the output of the oil amount detection unit 4, the output of the combustion sensor 14, the output of the temperature detection unit 9, and the like. The control is performed in such a sequence that the operating condition of the burner unit 12 is displayed on the display unit 20.

In the above configuration, the vaporizing section 7 is kept at a predetermined temperature or higher by the heating control of the heater 8 by the temperature detecting means 9, and vaporizes the fuel supplied from the pump 5 through the oil supply pipe 6. The vaporized gas is ejected from a nozzle unit 10 at the tip of the vaporizing unit 7, the surrounding air is sucked and mixed by an ejector effect, and the mixed gas is supplied into a burner unit 12 through a mixing pipe 11, It discharges from the flame hole and burns.

The generated gas is guided upward by a combustion tube 15 disposed so as to cover the periphery of the burner section 12, and is mixed with a room air flow from a blower 16 by a duct 17 covering the combustion tube 15. It is discharged as warm air and used for heating. When the control unit 18 adjusts the fuel supply amount by changing the drive frequency or the applied voltage of the pump 5 based on the operation condition signal or the like input from the operation unit 19,
The amount of primary air also increases and decreases accordingly, and the amount of combustion can be changed while the fuel-to-air ratio is kept constant.

[0007] When the fuel level is reduced due to the further use of the fuel and the oil level in the tank 2 is lowered, the oil level detecting means 4 detects the oil level and the display section 20 runs out of oil. After the display and the drive control of the pump 5, the heater 8, the blower 16 and the like in a predetermined sequence, the fuel in the tank 2 further runs out and the pump 5
The combustion of the burner unit 12 is stopped after a predetermined time elapses so as to stop the combustion before the fuel can no longer be sent.

Further, the control section 18 applies a voltage to the frame electrode 13 and the burner section 12 and controls the combustion state according to the output of the combustion sensor 14 obtained by measuring the amount of current flowing. When the combustion of the burner unit 12 becomes abnormal for some reason, for example, when the combustion amount becomes extremely small, the current value decreases and the control unit 18
In order to prevent premature disconnection in a normal state, if the current value is kept lower than a predetermined value for a predetermined period of time, it is determined that there is an abnormality, and a signal is output to the control unit 18. Is displayed according to the details of the combustion abnormality.

[0009]

However, in such a conventional oil hot air heater, the fuel in the tank 2 is used less and the oil level in the tank 2 becomes lower, so that the oil level becomes higher. After the oil level detecting means 4 detects the oil level and makes the display section 20 indicate that the fuel is running out, the burner section after a predetermined time has elapsed so as to stop the combustion before the fuel in the tank 2 runs out and the pump 5 cannot feed the fuel. 12 is stopped, but considering the variation in the oil level of the oil level detecting means 4 and the combustion amount of the burner section 12, that is, the variation in the fuel consumption, etc., the above-mentioned predetermined time is considerable. There was a problem that it became shorter.

If the above-mentioned predetermined time is too long in order to improve the usability by increasing the combustion time after the oil level detecting means 4 detects that the oil level is low, the control unit 18 will run out of oil due to the burner unit. If the fuel in the tank 2 runs out and the pump 5 cannot send fuel before stopping the combustion in the combustion unit 12, the combustion amount in the burner unit 12 becomes extremely small on the way, and the combustion sensor 14 detects the abnormality. Therefore, there is also a problem that the combustion is stopped and the display unit 20 displays a combustion abnormality despite the stoppage of running out of oil.

In this case, in particular, the stoppage due to running out of oil is a normal stop, whereas the stoppage due to abnormal combustion indicates a malfunction of the equipment, giving the user a feeling of anxiety and causing abnormal combustion. In addition, there is a fear that the user may continue to use the fuel without knowing it as a normal combustion stoppage due to running out of oil.

When the oil runs out, the amount of oil supplied from the pump 5 is too large or too small to supply irregularly the fuel by sucking and discharging the fuel and air, and the combustion state in the burner unit 12 becomes unstable, and the combustion sensor If the current value of 14 is not maintained for a predetermined time in a state where the current value is lower than the predetermined value, the control unit 18 does not detect it as abnormal combustion, causes a variation in the time for stopping the combustion, and may continue large pulse combustion for several seconds, At that time,
It produces a strong odor with an unusual sound,
There was also a risk of giving the user anxiety and discomfort.

The present invention has solved the above-mentioned problems, and has a simple structure, which increases the burning time after the oil level detecting means 4 detects that the oil level has run out and improves the usability. The purpose of this is to make it possible to stop the combustion by detecting the detection of combustion earlier than usual when the oil runs out, to reduce the noise and odor generated when the combustion stops when the oil runs out and not to give the user discomfort. .

[0014]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a tank for storing fuel, an oil amount detecting means for detecting a remaining amount of fuel in the tank, and a fuel sucking from the tank. A discharge pump, a burner for burning fuel supplied by the pump, and a frame electrode disposed in the vicinity of the burner and placed in a combustion flame and applying a voltage to the burner and measuring the amount of current flowing therethrough. A combustion sensor of a flame rod type for detecting a combustion state, a combustion tube covering the burner portion and guiding the flue gas generated in the burner portion upward, and a combustion tube covering the combustion tube and the indoor air flow from the blower. A duct for mixing and producing hot air; and a control unit for receiving a signal from the combustion sensor or the like and controlling operating conditions of the pump or the like to control combustion of the burner unit. If the current amount obtained by the combustion sensor is lower than the predetermined value and held for the first predetermined time when the residual oil amount in the tank is equal to or more than the predetermined amount, it is determined that an abnormality has occurred and a signal of a combustion abnormality is output to the control unit. At the same time, when the signal of the oil amount detecting means is equal to or less than a predetermined amount of the residual oil amount in the tank, an indication of running out of oil is displayed, and from that time or after a predetermined period has elapsed since the detection, the combustion sensor is If a second predetermined time shorter than the first predetermined time is held in a state in which the amount of current is lower than the predetermined value, it is determined that there is an abnormality, a combustion abnormality signal is output to the control unit, and combustion is stopped. A combustion sensor control unit is provided which causes the display unit to indicate that the combustion has stopped due to the abnormal combustion signal.

[0015]

According to the present invention, as described above, the combustion sensor controller detects the abnormal combustion by the combustion sensor earlier than usual when the signal of the oil amount detecting means is equal to or less than the predetermined amount of the residual oil amount in the tank. Therefore, abnormal combustion such as pulse combustion that occurs when the oil runs out is detected early to stop the combustion, so that the user does not feel uncomfortable.

Further, the fuel can be continuously burned until the fuel in the tank runs out and the pump can no longer supply the fuel, so that the burning time after indicating that the oil has run out becomes longer, and the time until refueling can be lengthened. The usability is improved.

Further, since the stop of combustion due to the abnormal combustion signal from the combustion sensor caused by the pump being unable to supply fuel is displayed on the display unit as a display indicating that the fuel has run out of fuel, erroneous display can be prevented and safety can be ensured. .

Furthermore, the period during which the stop of combustion based on the abnormal combustion signal from the combustion sensor control unit is displayed as the combustion stop indicating that the fuel has run out can be shortened, so that safety is further improved.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. The same parts as those in the conventional example are denoted by the same reference numerals, and the description thereof will be omitted.

In FIG. 1, reference numeral 21 denotes a combustion sensor control unit provided in a part of a control unit 18 for controlling the driving of the pump 5, the heater 8, the blower 16, and the like.
Is controlled so as to continue and stop the combustion in accordance with the obtained output and display on the display unit 20.

The combustion sensor control unit 21 is configured as shown in FIGS. 2, 3, and 4. The configuration and operation will be described below.

The invention shown in FIG. 2 will be described. When the signal from the oil amount detecting means 4 is equal to or more than the predetermined amount of the residual oil amount in the tank 2, the combustion sensor control unit 21 performs the first operation in a state where the amount of current obtained by the combustion sensor 14 at 22 is lower than the predetermined value. When the predetermined time is held, it is determined that the combustion is abnormal, and a signal of a combustion abnormality is output to the control unit 18 to stop the combustion, and the display unit 20 displays the abnormal combustion stop. Then, the signal of the oil amount detecting means 4 is
When the remaining oil amount is less than a predetermined amount, the display unit 20 indicates that the oil has run out, and from that point of time or after a predetermined period has elapsed since the detection, the amount of current obtained by the combustion sensor 14 becomes smaller than a predetermined value. In the lowered state, if a second predetermined time shorter than the first predetermined time is held, it is determined that an abnormality has occurred at 23, a combustion abnormality signal is output to the control unit 18, and combustion is stopped at 24, and at 25 The stop of the combustion by the abnormal combustion signal from the combustion sensor 14 is displayed on the display unit 20 as the stop of the fuel shortage.

According to the present invention, when the signal from the oil amount detecting means 4 is equal to or less than the predetermined amount of the residual oil amount in the tank 2, the combustion sensor control unit 21 detects the abnormality of the combustion earlier than usual when the signal from the oil amount detecting means 4 is smaller than the predetermined amount. Therefore, abnormal combustion such as pulse combustion that occurs when the oil runs out can be detected quickly and the combustion can be stopped to prevent the user from feeling uncomfortable.

Therefore, the fuel can be continuously burned until the fuel in the tank 2 runs out and the pump 5 can no longer feed the fuel, so that the burning time after the indication of running out of oil becomes longer and the time until refueling becomes longer. User convenience is improved.

Further, since the stop of combustion due to the abnormal combustion signal from the combustion sensor 14 caused by the pump 5 being unable to supply fuel is indicated by the display unit 20 as the stop of combustion due to running out of fuel, an erroneous display can be prevented, and safety can be prevented. Can also be secured.

Next, in the invention shown in FIG. 3, when the signal of the oil amount detecting means 4 is equal to or more than the predetermined amount of the residual oil amount in the tank 2, the combustion sensor control unit 21 obtains the combustion sensor 14 at 26. If the current amount is lower than the first predetermined value and held for a predetermined period of time, it is determined that there is an abnormality, and a signal of a combustion abnormality is output to the control unit 18 to stop the combustion and the display unit 20 displays the abnormal combustion stop. . When the signal from the oil amount detection means 4 is equal to or less than the predetermined amount of the residual oil amount in the tank 2, the display unit 20 displays an oil shortage, and from that time or after a predetermined period has elapsed since the detection, The amount of current obtained by the combustion sensor 14 is the first
If the temperature is held for a predetermined time in a state in which the temperature is lower than a second predetermined value higher than the predetermined value, it is determined that an abnormality has occurred at 27, a signal indicating a combustion abnormality is output to the control unit 18, and combustion is stopped at 28, and at 29, The stop of the combustion by the abnormal combustion signal from the combustion sensor 14 is displayed on the display unit 20 as a fuel stop indicating that the fuel is running out.

According to the present invention, as described above, the combustion sensor control section 21 of the present invention, when the signal of the oil amount detecting means 4 is equal to or less than the predetermined amount of the residual oil amount in the tank 2, is faster than usual. Since abnormal combustion is detected by the combustion sensor 14, abnormal combustion such as pulse combustion that occurs when the oil runs out can be quickly detected and stopped to prevent the user from feeling uncomfortable.

As a result, the fuel is continuously burned until the fuel in the tank 2 runs out and the pump 5 can no longer feed the fuel, so that the burning time after the indication of running out of oil becomes longer, and the time until refueling can be made longer. User convenience is improved.

Further, since the stoppage of combustion due to the abnormal combustion signal from the combustion sensor 14 caused by the pump 5 being unable to supply fuel is indicated by the display unit 20 as a combustion stoppage indicating that the fuel has run out, an erroneous display can be prevented, and safety can be prevented. Can also be secured.

Further, if the current amount obtained by the combustion sensor 14 is kept lower than a second predetermined value higher than the first predetermined value for a predetermined period of time, it is determined that the control unit 1 has an abnormality.
Because it outputs the signal of abnormal combustion to 8,
Compared to the first configuration, the abnormality of combustion can be detected by the combustion sensor more quickly than usual. Further, abnormal combustion such as pulse combustion occurring when the oil runs out is detected earlier to stop the combustion, so that the user is not injured. Pleasure can not be given.

Next, in the invention shown in FIG. 4, when the signal of the oil amount detecting means 4 is equal to or more than the predetermined amount of the residual oil amount in the tank 2, the combustion sensor control unit 21 obtains the value of the combustion sensor 14 at 30. If the current amount is lower than the first predetermined value and held for the first predetermined time, it is determined that there is an abnormality, and a signal of a combustion abnormality is output to the control unit 18 to stop the combustion, and the display unit 20 displays the abnormal combustion stop. do. Then, the signal of the oil amount detecting means 4 is
When the remaining oil amount is less than or equal to a predetermined amount, an indication of running out of oil is displayed, and the current amount obtained by the combustion sensor 14 is higher than a first predetermined value from that point of time or after a predetermined period has elapsed since the detection. If the temperature is kept below the second predetermined value for a second predetermined time, it is determined that there is an abnormality at 31 and a combustion abnormality signal is output to the control unit 18, combustion is stopped at 32, and a combustion sensor is detected at 33. The stop of the combustion due to the abnormal combustion signal at 14 is displayed on the display unit 20 as the combustion stop of the fuel shortage.

According to the present invention, the combustion sensor control unit 21 operates as described above, when the signal of the oil amount detecting means 4 is equal to or less than the predetermined amount of the residual oil amount in the tank 2, similarly to the first structure. Since the abnormality of combustion is detected by the combustion sensor 14 quickly, abnormal combustion such as pulse combustion generated when the oil runs out can be detected early and the combustion can be stopped to prevent the user from feeling uncomfortable.

Therefore, the fuel can be continuously burned until the fuel in the tank 2 runs out and the pump 5 can no longer feed the fuel, so that the burning time after the indication of running out of oil becomes longer, and the time until refueling can be made longer. User convenience is improved.

Then, the stoppage of the combustion caused by the abnormal combustion signal from the combustion sensor 14 caused by the pump 5 being unable to send the fuel is indicated by the display unit 20 as the stoppage of the fuel shortage. Can also be secured.

Further, if the current amount obtained by the combustion sensor 14 is maintained for a second predetermined time in a state in which the amount of current is lower than a second predetermined value higher than the first predetermined value, it is determined that there is an abnormality, and the control unit 18 burns. Since the abnormality signal is output, the combustion abnormality can be detected by the combustion sensor 14 earlier than usual compared with the first and second configurations, and abnormality such as pulse combustion occurring when the oil runs out can be obtained. It is possible to detect the combustion early and stop the combustion to prevent the user from feeling uncomfortable.

In the above embodiment, the first, second, and third
In any of the configurations described above, the combustion sensor control unit 21 causes the combustion sensor 14 to detect abnormal combustion earlier than usual when the signal of the oil amount detection means 4 is equal to or less than the predetermined amount of the residual oil amount in the tank 2. As a result, there is less room for operation of the combustion sensor 14 with respect to disturbances that do not hinder use than usual and variations in the combustion sensor 14 and the like, so that the combustion sensor 14 is easily cut off quickly.

However, after a predetermined time has passed since the detection of the residual oil amount in the tank 2 that is equal to or less than the predetermined amount, the combustion sensor 14 detects an abnormal combustion earlier than usual, and However, in actual use, there is no problem only in that the combustion time when running out of oil is slightly shortened, and the combustion sensor 14 is obtained when the residual oil amount in the tank 2 is equal to or less than a predetermined amount in consideration of variations in the actual machine. What is necessary is just to set a predetermined value or a holding time for detecting abnormal combustion with respect to the obtained current value.

The oil level of the fuel in the tank 2 is replaced by oil level detecting means 4 using a float or the like for detecting the oil level in the tank 2. And the combustion sensor control unit 21
Is a system that can detect abnormal combustion based on the output of the combustion sensor 14 earlier than usual when oil runs out and stop combustion.
The combustion stop display method for running out of fuel has been described at the same time. In addition, the configuration of each unit may be any configuration as long as the object of the present invention is achieved.

[0039]

As described above, the combustion control apparatus according to the present invention enables the combustion sensor to detect abnormal combustion earlier than usual when the oil runs out and to stop the combustion. With a simple configuration, the oil level detecting means 4 increases the burning time after the oil level is detected to reduce the noise and odor and does not cause discomfort to the user. As a result, it is possible to ensure that the stop of combustion is indicated on the display unit by running out of oil to ensure safety.

[Brief description of the drawings]

FIG. 1 is a block diagram of a combustion control device according to an embodiment of the present invention.

FIG. 2 is a flowchart of the control device.

FIG. 3 is a flowchart of a control device according to another invention.

FIG. 4 is a flowchart of a control device according to another invention.

FIG. 5 is a sectional view of a petroleum hot air heater using the present invention and a conventional combustion control device.

FIG. 6 is a block diagram showing a conventional combustion control device.

[Explanation of symbols]

 Reference Signs List 2 tank 3 cartridge tank 4 oil level detecting means 5 pump 12 burner unit 13 frame electrode 14 combustion sensor 15 combustion cylinder 16 blower 17 duct 18 control unit 20 display unit 21 combustion sensor control unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23N 5/24 106 F23N 5/24 101 F23N 5/12

Claims (4)

(57) [Claims] 1. A tank for storing fuel, an oil amount detecting means for detecting a remaining amount of fuel in the tank, a pump for sucking and discharging fuel from the tank, and a fuel for supplying fuel by the pump. A burner portion, a flame electrode disposed in the vicinity of the burner portion and placed in a combustion flame, and a flame rod type combustion sensor for detecting the combustion state by measuring the amount of current flowing by applying a voltage to the burner portion. A combustion tube that covers the burner portion and guides the combustion exhaust gas generated in the burner portion upward, a duct that covers the combustion tube and mixes the combustion exhaust gas with the indoor air flow from the blower to generate hot air, the combustion sensor, and the like. A control unit for controlling the operating conditions of the pump and the like in response to the signal to control the combustion in the burner unit, and when the signal of the oil amount detecting means is equal to or more than a predetermined amount of the residual oil amount in the tank, the combustion is performed. sensor If the obtained current amount is kept below the predetermined value for a first predetermined time, it is determined that there is an abnormality, and a signal of a combustion abnormality is output to the control unit. When the amount of oil is less than the predetermined amount, an oil shortage is displayed, and from that point of time or after a lapse of a predetermined period from the detection, the current amount obtained by the combustion sensor is shorter than the first predetermined time in a state where the current amount has become lower than the predetermined value. A combustion control device, comprising: a combustion sensor control unit that outputs a signal of a combustion abnormality to a control unit when it is determined to be abnormal when held for a second predetermined time. 2. When the signal of the oil amount detecting means is equal to or more than a predetermined amount of the residual oil amount in the tank, the amount of current obtained by the combustion sensor becomes the first amount.
When it is held for a predetermined time in a state where it is lower than the predetermined value, it is determined that an abnormality has occurred, and a signal of a combustion abnormality is output to the control unit.
When the signal of the oil amount detecting means is less than a predetermined amount of the residual oil amount in the tank, a display of oil shortage is displayed, and the current amount obtained by the combustion sensor from that time or after a predetermined period has elapsed since the detection is detected. 2. A combustion sensor control unit for judging an abnormality when a predetermined time is maintained below a second predetermined value higher than the first predetermined value and outputting a combustion abnormality signal to the control unit, is provided. Combustion control device. 3. When the signal of the oil amount detecting means is equal to or more than a predetermined amount of the residual oil amount in the tank, the amount of current obtained by the combustion sensor is equal to the first amount.
When a first predetermined time is held in a state where the oil amount is lower than the predetermined value, it is determined that there is an abnormality, and a signal of a combustion abnormality is output to the control unit. In some cases, an indication of running out of oil is displayed, and after a predetermined period has elapsed since that time or after the detection, the amount of current obtained by the combustion sensor falls below a second predetermined value higher than the first predetermined value. 2. The combustion control device according to claim 1, further comprising a combustion sensor control section that determines that the state is abnormal when the predetermined time is maintained for 2, and outputs a signal indicating abnormal combustion to the control section. 4. When the signal of the oil amount detecting means is equal to or more than a predetermined amount of the residual oil amount in the tank, if the current amount obtained by the combustion sensor is kept below a predetermined value for a first predetermined time, it is determined that an abnormality has occurred. Judgment and outputs a signal of combustion abnormality to the control unit,
When the signal of the oil amount detecting means is less than a predetermined amount of the residual oil amount in the tank, a display of oil shortage is displayed, and the current amount obtained by the combustion sensor from that time or after a predetermined period has elapsed since the detection is detected. If the second predetermined time shorter than the first predetermined time is held for a second predetermined time shorter than the predetermined value, it is determined to be abnormal and a signal of abnormal combustion is output to the control unit, and the stop of combustion by the abnormal combustion signal from the combustion sensor is displayed. 2. The combustion control device according to claim 1, further comprising a combustion sensor control section for displaying a combustion stop indicating that the fuel has run out.