JPH05157226A - Combustion device - Google Patents

Abstract

PURPOSE:To prevent either a rated maximum fuel volume or a rated minimum fuel volume requiring originally adjustment from being out of its appropriate value. CONSTITUTION:In an FF type gas air heating machine comprising a gas proportional control valve 21 for use in controlling the amount of gas supplied to a gas burner, a micro-computer 25 for use in calculating the output voltage corresponding to a required amount of gas for the gas burner, and a proportional valve driving circuit 26 for use in controlling a current value applied to the gas proportional control valve 21, the micro-computer 25 outputs either a rated maximum voltage or a rated minimum voltage upon turning on either a maximum output setting switch 33 or a minimum output setting switch 34. Then, either the rated maximum voltage or the rated minimum voltage is corrected to an adjusted voltaged adjusted by either the maximum output adjusting resistor 35 or the minimum output adjusting resistor 36 and then outputs it to the proportional valve driving circuit 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus using a proportional control valve for controlling the amount of fuel to be burned by changing the opening degree of a fuel supply passage according to the value of supplied current.

[0002]

2. Description of the Related Art Conventionally, in a combustion apparatus, for example, a gas heating apparatus, a gas proportional control valve for adjusting the amount of gas supplied to a gas burner, a set temperature set by a temperature setter, and a temperature detector are used. An output calculation circuit that calculates the output voltage based on the required gas amount to the gas burner from the detected temperature, and an energization control circuit that switches the current value supplied to the gas proportional control valve based on the output voltage from this output calculation circuit Some have and.

In Japanese Patent Publication No. 3-60015, in order to adjust the secondary pressure of the gas proportional control valve, a maximum secondary pressure output setting switch and a minimum secondary pressure output setting switch are provided at the input terminals of the output calculation circuit. A gas combustion device is disclosed in which a switch is connected to a maximum secondary pressure adjusting resistance and a minimum secondary pressure adjusting resistance. In this gas combustion device, the inspector turns on the maximum secondary pressure output setting switch to adjust the maximum secondary pressure adjustment resistance to set the maximum voltage, and the inspector also sets the minimum secondary pressure output. The minimum voltage is set by turning on the setting switch and adjusting with the minimum secondary pressure adjusting resistor. Further, the output calculation circuit calculates the output voltage to be output to the energization control circuit based on the set maximum voltage and minimum voltage during combustion control.

On the other hand, in the gas heating device, when the detected temperature is considerably lower than the set temperature during the ignition operation, a special maximum gas amount exceeding the rated maximum gas amount is exceeded from the ignition operation until a predetermined time elapses. It is known to rapidly heat the inside of the room by supplying the gas burner to the gas burner and setting the gas burner to the strongest combustion state to perform combustion.

A gas heating device is also known in which a gas burner is composed of a plurality of burners. Generally, when trying to switch the combustion state of the gas burner from the weak combustion state to the strong combustion state while performing combustion with all the burners, the set gas pressure is adjusted in the range where the set gas pressure is low especially in the weak combustion state, Difficult to make adjustments. Therefore, an opening / closing valve is provided in the gas supply path to some of the plurality of burners, and when the combustion state of the gas burner is lower than a predetermined combustion state, the opening / closing valve is closed to partially Only the burner is used to adjust the combustion condition.

As a concrete control, when the combustion state of the gas burner is changed stepwise from a weak combustion state to a strong combustion state, the gas proportional control valve is operated from the weak combustion state to a predetermined combustion state. The combustion state is switched by gradually increasing the current value. Then, when the combustion state is further switched from the predetermined combustion state to the strong combustion state side, the on-off valve is opened and the current value to the gas proportional control valve is once lowered, and then the on-off valve is opened and the gas proportional control valve is opened. The combustion state is switched from a predetermined combustion state to a strong combustion state by gradually increasing the current value to the.

[0007]

However, in these gas heating devices, as described above, when the maximum secondary pressure of the gas proportional control valve is adjusted, a special maximum gas amount exceeding the rated maximum gas amount is set. However, the output voltage at the extra maximum gas amount may be equivalent to the maximum secondary pressure. Further, as described above, when the combustion amount reaches a predetermined value using the on-off valve and the gas proportional control valve,
When the on-off valve is opened and the current value to the gas proportional control valve is once lowered, the output voltage at the predetermined value may correspond to the minimum secondary pressure.

Therefore, as in the conventional gas heating device, which sets the maximum voltage and the minimum voltage on the basis of the secondary pressure of the gas proportional control valve, the rated maximum gas amount or the minimum gas amount which originally needs to be adjusted. There was a good possibility that the value would deviate from the proper value. It is an object of the present invention to provide a combustion device that prevents the rated maximum fuel amount or minimum fuel amount that originally needs to be adjusted from deviating from an appropriate value.

[0009]

[Means for Solving the Problems]

[Claim 1] According to the present invention, a proportional control valve for controlling an amount of fuel supplied to a combustion appliance based on an energization amount, a detected temperature detected by a temperature detector, and a set temperature set by a temperature setter are provided. From the output calculation circuit for calculating an output voltage based on the required fuel amount to the combustion appliance, and an energization control circuit for controlling the energization amount to the proportional control valve based on the output voltage from the output calculation circuit. The output operation circuit includes an output setting switch that is turned on when setting a rated maximum voltage based on a rated maximum fuel amount supplied to the combustion appliance, and the rated maximum voltage is adjusted when the output setting switch is turned on. The output setting switch, the rated maximum voltage is set to an adjustment voltage adjusted by operating the output setting switch when the output setting switch is turned on, and The rated maximum voltage employing the technical means to be output to the energization control circuit.

[Claim 2] The present invention is set by a proportional control valve for controlling the amount of fuel supplied to a combustion appliance based on the amount of energization, a temperature detected by a temperature detector, and a temperature setter. An output calculation circuit for calculating an output voltage based on a required fuel amount to the combustion appliance from a set temperature, and an energization control for controlling an energization amount to the proportional control valve based on an output voltage from the output calculation circuit. A circuit, the output operation circuit adjusts the minimum voltage when the output setting switch is turned on when setting the minimum voltage based on the minimum fuel amount to be supplied to the combustion appliance, and the output setting switch. And an output adjustment switch for setting the minimum voltage to an adjustment voltage adjusted by operating the output adjustment switch when the output setting switch is turned on. The minimum voltage was adopted technical means for outputting to said current control circuit.

[0011]

[Action]

[Claim 1] According to the present invention, when the inspector turns on the output setting switch, the output arithmetic circuit outputs the maximum voltage to the energization control circuit, so that the proportional valve is energized with an energization amount based on the maximum voltage. Supplies the rated maximum amount of fuel to the combustion appliance. At this time, the inspector further operates the adjustment switch to adjust the maximum voltage to the adjustment voltage so that the rated maximum fuel amount can be accurately obtained while considering the pressure of the fuel supplied to the combustion equipment and the combustion load. Then, the output arithmetic circuit sets the adjusted maximum voltage and outputs the set maximum voltage to the conduction control circuit. As a result, the proportional valve is energized with the energization amount based on the adjusted maximum voltage, so that the fuel of the accurate maximum rated fuel amount is supplied to the combustion appliance.

According to the present invention, when the inspector turns on the output setting switch, the output arithmetic circuit outputs the minimum voltage to the energization control circuit, so that the proportional valve energizes with the energization amount based on the minimum voltage. As a result, the minimum amount of fuel is supplied to the combustion appliance. At this time, if the inspector further operates the adjustment switch and adjusts the minimum voltage to the adjustment voltage so that the minimum amount of fuel can be accurately obtained while considering the pressure of the fuel supplied to the combustion appliance and the combustion load. The output arithmetic circuit sets the adjusted minimum voltage and outputs the set minimum voltage to the conduction control circuit.
As a result, the proportional valve is energized with an energization amount based on the adjusted minimum voltage, so that an accurate minimum fuel amount of fuel is supplied to the combustion appliance.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A combustion apparatus according to the present invention will be described based on an embodiment shown in FIGS. FIG. 1 is a diagram showing a control device of an FF type gas warm air heater, and FIG. 2 is a diagram showing an entire structure of the FF type gas warm air heater. FF type gas warm air heater 1
Includes a hot air duct 2, a convection fan 3, a combustion duct 4, a combustion fan 5, a gas burner 6, a heat exchanger 7, a gas supply passage 8 and a control device 9. The warm air duct 2 is a warm air passage that sucks indoor air from the suction port 10 and blows warm air toward the room from the air outlet 11. Inside the hot air duct 2, a convection fan 3, a gas burner 6 and a heat exchanger 7 are arranged.

The convection fan 3 generates an air flow toward the room inside the warm air duct 2, and changes the amount of air blown toward the room according to the value of the supplied current. The combustion duct 4 is an air passage that sucks the outdoor air from the suction port 12 that is open outside the room and supplies the combustion air to the gas burner 6. In this combustion duct 4,
A combustion fan 5 is arranged. The combustion fan 5 generates an air flow toward the gas burner 6 in the combustion duct 4, and uses the combustion air sucked from the combustion duct 4 and the fuel gas supplied from the gas supply passage 8 as the gas burner 6
Send to. The combustion fan 5 also changes the blowing amount of the air-fuel mixture toward the gas burner 6 according to the supplied current value.

The gas burner 6 is the combustion instrument of the present invention and is composed of a plurality of burners 13-15. These burners 13-15 are respectively combustion plates 16-18.
And a combustion duct 4 is connected to each upstream side. The heat exchanger 7 is connected to the downstream side of the plurality of burners 13 to 15 and causes the heat of combustion generated in any of the plurality of burners 13 to 15 to exchange heat with the air passing through the warm air duct 2. To heat the air. This heat exchanger 7
An exhaust duct 7 for exhausting combustion exhaust to the outside of the room
a is connected.

The gas supply passage 8 has a branch passage 19 for supplying the fuel gas only to the burner 13 and a branch passage 20 for supplying the fuel gas to the burners 14 and 15, to which a gas proportional control valve 21 and a first proportional control valve 21 are provided. -Third electromagnetic valves 22-24 are arranged. The gas proportional control valve 21 changes the supply pressure of the fuel gas by changing the opening diameter of the gas supply passage 8 based on the value of the current supplied to the coil (not shown) to change the gas amount to the gas burner 6. Is a valve that adjusts. The first and second solenoid valves 22 and 23 are open / close valves that open the gas supply passage 8 when a current flows through a coil (not shown). Third solenoid valve 24
Is an on-off valve that opens the branch path 19 when a current flows through a coil (not shown).

As shown in FIG. 1, the controller 9 includes a microcomputer 25, a proportional valve drive circuit 26, an electromagnetic valve drive circuit 27, a convection fan control circuit 28, a combustion fan control circuit 29, and a sparker control circuit 30. Have. The microcomputer 25 is the output arithmetic circuit of the present invention, and includes an operation switch 31, a temperature setter 32, a maximum output setting switch 33, a minimum output setting switch 34, a maximum output adjusting resistor 35, a minimum output adjusting resistor 36, and temperature detection. Bowl 37
And electric signals from the thermocouple 38, and voltage signals corresponding to these electric signals are supplied to the proportional valve drive circuit 26, the solenoid valve drive circuit 27, the convection fan control circuit 28, the combustion fan control circuit 29, and Output to the sparker control circuit 30.

The operation switch 31 is a start switch of the FF type gas warm air heater 1. The temperature setter 32 sets a set temperature and outputs an electric signal according to the set set temperature to the microcomputer 25. The maximum output setting switch 33 is a normally open contact and is turned on when setting the rated maximum voltage based on the rated maximum gas amount to the gas burner 6. The minimum output setting switch 34 is a normally open contact and is turned on when setting the minimum voltage based on the minimum gas amount to the gas burner 6.

The maximum output adjustment resistor 35 is a variable volume and adjusts the rated maximum voltage to the adjustment voltage when the maximum output setting switch 33 is turned on. The minimum output adjusting resistor 36 is a variable volume, and the minimum output setting switch 34
The minimum voltage is adjusted to the adjustment voltage when is turned on. The temperature detector 37 is the temperature detector of the present invention,
It is attached to the suction port 10 of the warm air duct 2. The temperature detector 37 is a thermistor that detects the room temperature and outputs an electric signal corresponding to the detected room temperature to the microcomputer 25. The thermocouple 38 is the burner 1
A thermocouple made of a different kind of metal is attached near the combustion plate 18 of No. 4 to generate an electromotive force due to the combustion flame and detect whether the gas burner 6 is abnormally burning, such as an oxygen deficiency state of the combustion flame.

The microcomputer 25 calculates the required gas amount to the gas burner 6 from the set temperature output by the temperature setter 32 and the room temperature output by the temperature detector 37, and the proportional valve is set to the required gas amount. A voltage signal is output to the drive circuit 26 and the combustion fan control circuit 29 to switch the combustion state of the gas burner 6. Specifically, it is determined based on the temperature difference between the indoor temperature and the set temperature, and the strongest combustion is performed in seven stages from the minimum combustion state to the rated maximum combustion state when the indoor temperature is considerably lower than the set temperature during ignition operation. The combustion state of the gas burner 6 is switched to eight stages including the state. That is, the combustion state of the gas burner 6 is switched by switching the current value to the combustion fan 5 and the gas proportional control valve 21 and opening / closing the third solenoid valve 24. Further, the microcomputer 25 sets the gas burner 6 to the rated maximum combustion state (7) when the maximum output setting switch 33 is turned on.
The output voltage of the rated maximum voltage is output to the proportional valve drive circuit 26 to be set to the step), and the rated maximum voltage is changed to the adjusted voltage adjusted by the maximum output adjusting resistor 35 and stored, and the stored rating is stored. The maximum output voltage is output to the proportional valve drive circuit 26.

Further, the microcomputer 25 outputs the minimum output voltage to the proportional valve drive circuit 26 in order to set the gas burner 6 to the minimum combustion state (one stage) when the minimum output setting switch 34 is turned on. At the same time, the minimum voltage is changed to the adjustment voltage adjusted by the minimum output adjustment resistor 36 and stored, and the stored output voltage of the minimum voltage is output to the proportional valve drive circuit 26. Then, the microcomputer 25 changes the adjusted voltage to the stored maximum rated voltage and minimum rated voltage, and based on the rated maximum voltage and the minimum voltage, the minimum combustion state (1
The output voltage from the stage) to the strongest combustion state (8 stages) is calculated.

The proportional valve drive circuit 26 is the energization control circuit of the present invention, and based on the output voltage from the microcomputer 25, the gas burner 6 is burned from the minimum combustion state to the strongest combustion state as shown in the graph of FIG. In order to switch to the state, the current value supplied to the gas proportional control valve 21 is changed from the minimum current value to the extra maximum current value.

The solenoid valve drive circuit 27 responds to the output from the microcomputer 25 by the first and second solenoid valves 22 and 2.
The energization to 3 and the stop of energization are controlled. As shown in the graph of FIG. 4, when the combustion state of the gas burner 6 is switched from the 3rd stage to the 4th stage, the solenoid valve drive circuit 27 determines that all the burners 13 should be changed to the 4th stage.
When switching the combustion state of the gas burner 6 from four stages to three stages by energizing the third solenoid valve 24 so as to perform combustion at ˜15, the burner 13 becomes burned when the proportional valve current reaches a current value corresponding to three stages. The third solenoid valve 24 so that combustion is performed only by itself.
Stop energizing the. The convection fan control circuit 28 changes the current value supplied to the convection fan 3 based on the output voltage from the microcomputer 25. The combustion fan control circuit 29 changes the current value supplied to the combustion fan 5 based on the output voltage from the microcomputer 25. The current value supplied to the combustion fan 5 is set based on the current value supplied to the gas proportional control valve 21. When the microcomputer 25 detects that the operation switch 31 is turned on, the sparker control circuit 30 inputs a voltage signal from the microcomputer 25, and the burner 14
39 installed near the combustion plate 17
Is energized, and energization to the sparker 39 is stopped after a lapse of a predetermined time after energization.

The operation of this FF type gas warm air heater 1 is shown in FIG.
4 to FIG. To adjust the rated maximum gas amount, the inspector first turns on (closes) the maximum output setting switch 33. Then, the microcomputer 25 outputs the output voltage of the rated maximum voltage to the proportional valve drive circuit 26, so that the proportional valve drive circuit 26 causes the proportional valve drive circuit 26 to output the maximum current value [the gas burner 6 is burned to a predetermined level according to the output voltage of the rated maximum voltage. State (7
Current value) to be applied to the coil of the gas proportional control valve 21. Therefore, since the rated maximum current value ((max) see the graph of FIG. 3) flows through the coil of the gas proportional control valve 21, by opening the gas supply passage 8 by an opening diameter corresponding to the rated maximum current value, The rated maximum gas amount of fuel gas is supplied to the gas burner 6.

At this time, when the inspector judges that the accurate rated maximum gas amount is not obtained, the inspector operates the maximum output adjusting resistor 35 to set it at an appropriate position. Then, a voltage signal corresponding to the position of the maximum output adjustment resistor 35 is input to the microcomputer 25, so that the microcomputer 25 corrects and sets the rated maximum voltage to the adjustment voltage based on the voltage signal. Therefore, since the corrected rated maximum voltage is output to the proportional valve drive circuit 26,
The corrected rated maximum current value also flows from the proportional valve drive circuit 26 to the coil of the gas proportional control valve 21. Therefore, a correction current value [(Ia) see the graph of FIG. 3] flows through the coil of the gas proportional control valve 21, so that the gas burner 6 is opened by opening the gas supply passage 8 by an opening diameter corresponding to the correction current value. An accurate rated maximum amount of fuel gas is supplied to.

In the adjustment of the minimum gas amount, as in the case of the adjustment of the rated maximum gas amount, the minimum output setting switch 34 is closed (closed).
The minimum current value or the correction current value [(min, Ib) see the graph in FIG. 3] flows through the coil of the gas proportional control valve 21. Therefore, the gas proportional control valve 21 opens the gas supply passage 8 by an opening diameter corresponding to the correction current value, so that the fuel gas of the correct minimum gas amount is supplied to the gas burner 6.

Here, the FF type gas warm air heater 1 is
When the indoor temperature is considerably lower than the set temperature during ignition operation, the rated maximum current value [(max) is applied to the coil of the gas proportional control valve 21 until a predetermined time elapses after ignition operation.
See the graph of FIG. 3] Special maximum current value [(I
c) Refer to the graph in FIG. 3] to supply a special maximum gas amount exceeding the rated maximum gas amount to the gas burner 6 and set the gas burner 6 to the strongest combustion state (8 stages) to perform rapid heating operation. I have to. Even if such rapid heating operation is performed, in the FF type gas warm air heater 1, the output voltage at the time of the special maximum gas amount output from the microcomputer 25 does not correspond to the maximum voltage. Absent.

Further, in the FF type gas warm air heater 1, when the combustion state of the gas burner 6 is switched from the minimum combustion state (1 stage) to the strongest combustion state (8 stages), the combustion state is the minimum combustion state (1 stage). From the step 3 to the step 3, with the first and second solenoid valves 22 and 23 opened and the third solenoid valve 24 closed, the current value to be further applied to the coil of the gas proportional control valve 21 is gradually increased. The combustion state is switched by increasing it. That is, the plurality of burners 13 to
Only the burner 13 of 15 is used to switch the combustion state.

Then, as shown in FIG. 4, when switching the combustion state of the gas burner 6 from three stages to four stages,
The third solenoid valve 24 is opened and the gas proportional control valve 21 is opened.
The current value flowing through the coil of the
n) See graph in FIG. 3] Lower current value [(Id) See graph in FIG. 3]
The combustion state of the gas burner 6 is switched from 4 stages to the strongest combustion state (8 stages) by gradually increasing the current value flowing through the coil of the gas proportional control valve 21 in a state where all 15 are used. .. Therefore,
Even if the current value flowing to the coil of the gas proportional control valve 21 is temporarily reduced when the combustion state of the gas burner 6 is switched from three stages to four stages, the output voltage at the predetermined current value corresponds to the minimum voltage. It never happens.

As described above, since the FF type gas warm air heater 1 can output an appropriate output voltage from the microcomputer 25 to the proportional valve drive circuit 26 under any circumstances, it is necessary to make an adjustment. The rated maximum gas amount and minimum gas amount do not deviate from the proper gas amount.
In the present embodiment, the output setting switch that is turned on when setting the maximum voltage or the minimum voltage is provided separately, but as the output setting switch by pressing a plurality of temperature setting switches and other switches at the same time. You may make it work.

Although the present invention is applied to the FF type gas warm air heater 1 in this embodiment, the present invention may be applied to other gas heaters or gas water heaters. Further, it may be applied to a combustion device that uses a liquid fuel such as kerosene as the fuel. In the present embodiment, the gas proportional control valve 21 is applied as the proportional control valve, but a proportional control valve having a gear motor that changes the opening diameter of the fuel supply passage in accordance with the energization amount may be applied as the proportional control valve.

[0032]

【The invention's effect】

[Claim 1] According to the present invention, it is possible to prevent the rated maximum fuel amount, which originally requires adjustment, from deviating from an appropriate value. [Claim 2] According to the present invention, it is possible to prevent the minimum fuel amount that originally needs to be adjusted from deviating from an appropriate value.

[Brief description of drawings]

FIG. 1 is a block diagram showing a control device of an FF type gas warm air heater according to the present invention.

FIG. 2 is a schematic diagram showing the overall structure of an FF type gas warm air heater according to the present invention.

FIG. 3 is a graph showing the relationship between the current value flowing through the coil of the gas proportional control valve and the combustion state of the gas burner.

FIG. 4 is a graph showing the relationship between the open / closed state of a third solenoid valve and the combustion state of a gas burner.

[Explanation of symbols]

 1 FF type gas hot air heater (combustion device) 6 gas burner (combustion equipment) 21 gas proportional control valve 25 microcomputer (output calculation circuit) 26 proportional valve drive circuit (energization control circuit) 32 temperature setter 33 maximum output setting switch 34 Minimum Output Setting Switch 35 Maximum Output Adjusting Resistance (Output Adjusting Switch) 36 Minimum Output Adjusting Resistance (Output Adjusting Switch) 37 Temperature Detector

Claims (2)

[Claims] 1. A combustion instrument based on a proportional control valve for controlling the amount of fuel supplied to a combustion instrument based on an energization amount, a detected temperature detected by a temperature detector, and a set temperature set by a temperature setter. An output calculation circuit for calculating an output voltage based on a required fuel amount to the output control circuit, and an energization control circuit for controlling an energization amount to the proportional control valve based on an output voltage from the output calculation circuit. The arithmetic circuit is an output setting switch that is turned on when setting the rated maximum voltage based on the rated maximum fuel amount supplied to the combustion appliance, and an output adjustment switch that adjusts the rated maximum voltage when the output setting switch is turned on. When the output setting switch is turned on, the rated maximum voltage is set to the adjustment voltage adjusted by operating the output adjustment switch, and the set constant is set. Combustion apparatus characterized by outputting a maximum voltage to the energization control circuit. 2. The combustion instrument based on a proportional control valve for controlling the amount of fuel supplied to the combustion instrument based on the amount of electricity supplied, and a detected temperature detected by a temperature detector and a set temperature set by the temperature setter. An output calculation circuit for calculating an output voltage based on a required fuel amount to the output control circuit, and an energization control circuit for controlling an energization amount to the proportional control valve based on an output voltage from the output calculation circuit. The arithmetic circuit has an output setting switch that is turned on when setting the minimum voltage based on the minimum amount of fuel supplied to the combustion appliance, and an output adjustment switch that adjusts the minimum voltage when the output setting switch is turned on. When the output setting switch is turned on, the minimum voltage is set to the adjustment voltage adjusted by operating the output adjustment switch, and the set minimum voltage is energized. Combustion apparatus and outputting the control circuit.