JP2614680B2 - Combustion equipment - 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 apparatus using a proportional control valve for controlling the amount of fuel supplied to a combustion apparatus by changing the degree of opening of a fuel supply passage according to a supplied current value.

[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 an amount of gas supplied to a gas burner, and a set temperature set by a temperature setter and detected by a temperature detector. An output operation circuit that calculates an output voltage based on a required gas amount to the gas burner from the detected temperature, and an energization control circuit that switches a current value supplied to the gas proportional control valve based on the output voltage from the output operation circuit. Some are provided with

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

On the other hand, when the detected temperature is considerably lower than the set temperature during the ignition operation, the gas heating apparatus supplies a special maximum gas amount exceeding the rated maximum gas amount until a predetermined time has elapsed since the ignition operation. There is known a method in which a room is rapidly heated by supplying the gas to a gas burner and setting the gas burner to the strongest combustion amount to perform combustion.

There is also known a gas heating apparatus in which a gas burner is constituted by a plurality of burners. In general, while burning all burners, minimize the amount of gas burner combustion
When you try to switch from the amount up to the maximum combustion amount, especially the most
With a small combustion amount , the adjustment is performed in a range where the set gas pressure is low, and it is difficult to perform the adjustment accurately. For this reason, an on-off valve is provided in a gas supply path to some of the plurality of burners, and when the combustion amount of the gas burner is lower than a predetermined combustion amount, the on-off valve is closed and partially closed. The burner is used to regulate the amount of combustion.

[0006] As a specific control, the combustion of the gas burner
When the amount is switched stepwise from the minimum combustion amount to the maximum combustion amount, the combustion amount of the gas burner is increased by gradually increasing the current value to the gas proportional control valve from the minimum combustion amount to the predetermined combustion amount. Switch. And gas
When the burner combustion amount is further switched from the predetermined combustion amount to the maximum combustion amount side, the on-off valve is opened and the current value to the gas proportional control valve is temporarily reduced, and then the gas proportional control valve is opened with the on-off valve opened. By gradually increasing the current value to the gas burner , the combustion amount of the gas burner is
I try to switch to the amount .

[0007]

However, in these gas heaters, 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 special 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, the on-off valve is opened and the current value to the gas proportional control valve is once decreased. There was a possibility that the output voltage at the time of the predetermined value was equivalent to the minimum secondary pressure . Therefore, as in the conventional gas heating system, which sets the maximum voltage and the minimum voltage based on the secondary pressure of the gas proportional control valve, originally adjusted maximum rated gas amount or minimum amount of gas required There was a good possibility that it would deviate from an appropriate value .

The invention described in claim 1 and claim 3 is
When the detected temperature is significantly lower than the set temperature, open the switching valve.
Special maximum fuel amount exceeding the rated maximum fuel amount while valved
Also adjusts the supply to multiple combustion appliances
To prevent the required maximum fuel amount from deviating from the appropriate value.
The purpose of the present invention is to provide a combustion device.

[0010] The invention described in claims 2 and 3 is
When multiple appliances switch from partial to full combustion
The switching valve is opened and the current to the proportional control valve is
Value is smaller than the rated minimum current value according to the rated minimum fuel amount.
The minimum rated fuel that needs to be adjusted
Provision of a combustion device that prevents the fuel amount from deviating from an appropriate value
Aim.

[0011]

According to a first aspect of the present invention, there is provided a fuel supply apparatus comprising: a plurality of combustion devices for burning fuel ;
Switch to whole combustion that burns all of multiple burning appliances
A part for burning a part of the plurality of burning appliances when the valve is closed.
Switching valve for switching to minute combustion and large current value
Increases the amount of fuel supplied to the multiple combustion appliances
Out from causing a proportional control valve, output calculation circuits for calculating a set temperature Toka et output current set by the detected temperature and the temperature setter detected by temperature detector, and the output processing circuit
An energization control circuit that controls a current value to be applied to the proportional control valve based on a force current , wherein the detected temperature is set to the set value.
Opening the switching valve when the temperature is significantly lower than the temperature
In addition, the value of the current supplied to the proportional control valve is
Special maximum fuel exceeding the rated maximum fuel amount supplied to the baking appliance
Control device for setting the special maximum current value according to the amount
In the combustion apparatus, the output operation circuit, the maximum output setting means which is turned on when setting the rated maximum current value corresponding to the rated maximum fuel amount, and the rated maximum current at the time of turn-on of the maximum output setting means maximum output adjustment hand to adjust the value
It has a step, when the maximum output setting means is turned on, the corrected rated maximum current value in the adjustment value of the current is adjusted by operating the maximum output adjusting means, the energization control
The circuit controls the proportional control valve at the corrected rated maximum current value.
The technical means for controlling the energization is adopted.

According to a second aspect of the present invention, fuel is burned.
And a plurality of combustion appliances when the valve is opened.
Switching the entire combustion of burning section, a switching valve for switching the partial combustion for combusting a portion of the plurality of burner when the valve is closed, the current value is energized increases, the plurality of <br/> burner A proportional control valve that increases the amount of fuel supplied to the
Output calculation circuits for calculating a set temperature Toka et output current set by the detected temperature and the temperature setter detected by temperature detector,
And an energization control circuit for controlling a current value for energizing the proportional control valve based on an output current from the output arithmetic circuit.
Wherein the plurality of combustion appliances change from partial combustion to total combustion
When switching, open the switching valve and once
The current value to be supplied to the proportional control valve is determined by the plurality of combustion appliances.
From the rated minimum current value according to the rated minimum fuel amount supplied to
With a control device that sets the minimum special current value
In the combustion device, the output operation circuit may be configured so that the rated minimum
Minimum output setting means to be turned on when setting the current value , and the rated minimum current when the minimum output setting means is turned on.
Has a minimum output adjusting means for adjusting the value, when the minimum output setting means is turned on, the nominal minimum conductivity adjustment current that is adjusted by operating the minimum output adjusting means
Current value , and the energization control circuit corrects the rated maximum value.
Technical means for energizing the proportional control valve with a small current value is employed.

According to a third aspect of the present invention, the fuel is burned.
And a plurality of combustion appliances when the valve is opened.
Switch to whole combustion to burn the part
Switch to partial combustion, which burns some of the combustion equipment
When the current value to be energized increases, the plurality of
A proportional control valve for increasing the amount of fuel supplied to the combustion appliance,
The detected temperature detected by the temperature detector and the temperature set by the temperature setting device
An output calculation circuit that calculates the output current from the set temperature and
And based on the output current from this output arithmetic circuit,
There is an energization control circuit that controls the current value to the proportional control valve.
And when the detected temperature is considerably lower than the set temperature.
Then, the switching valve is opened and the proportional control valve is opened.
The maximum value of the electric current to be supplied to the plurality of
When large amount of fuel is set to a special maximum current value corresponding to Eru Yue special maximum fuel amount, the plurality of burner is switched to the entire combustion from the partial combustion, as well as opening the switching valve, once the proportional control valve Bei the current value to be supplied, and a control device for setting a small special minimum current value than the rated minimum current value corresponding to the rated minimum amount of fuel supplied to the plurality of burner in
In the combustion device obtained above, the output operation circuit has the rating
Input when setting the rated maximum current value according to the maximum fuel amount
Maximum output setting means to be activated
Sometimes a maximum output adjusting means for adjusting the rated maximum current value,
Minimum output that is input when setting the rated minimum current value
Setting means, and when the minimum output setting means is turned on,
It has minimum output adjustment means for adjusting the rated minimum current value.
When the maximum output setting means is turned on, the maximum output
Before the adjustment current value adjusted by operating the adjustment means.
In addition to correcting the rated maximum current value, the minimum output
When the means is turned on, the minimum output adjusting means is operated.
The adjusted current value adjusted by
Value, and then the corrected rated maximum current value and corrected
The current value between the rated minimum current value
Based on the rated maximum current value and the corrected rated minimum current value.
The energization control circuit calculates the calculated power
Technical means for controlling the energization of the proportional control valve according to the flow value
Adopted.

[0014]

According to the first and third aspects of the present invention, the inspector turns on the maximum output setting means and further adjusts the maximum output.
By operating the stage , the rated maximum current value is adjusted so as to accurately obtain the rated maximum fuel amount in consideration of the pressure of fuel supplied to the plurality of combustion appliances, the combustion load, and the like . Then, the output calculation circuit adds the rated maximum current to the adjusted current.
It is corrected values, and outputs the rated maximum current value correction to the conduction control circuit. And detected by the temperature detector
The detected temperature is lower than the set temperature set by the temperature setting device.
When low, open switching valve to burn multiple combustion appliances
Switching and the maximum rated
When the proportional control valve is energized at the special maximum current value according to the special maximum fuel amount exceeding the large fuel amount and multiple combustion appliances are burned at the strongest combustion amount, the proportional control valve is set at the special maximum current value. Does not correspond to the rated maximum fuel amount. As a result, the corrected rated maximum
When the proportional control valve is energized at a large current value,
Thus, the correct rated maximum fuel amount of fuel is supplied to the plurality of combustion appliances, and the plurality of combustion appliances burn the maximum combustion amount .

[0015] The invention described in claims 2 and 3 is
The inspector turns on the minimum output setting means and further adjusts the minimum output.
Operating the regulating means to control the fuel supplied to the
Accurate minimum fuel quantity while considering pressure and combustion load
The rated minimum current value is adjusted to obtain Do
When the output calculation circuit is configured to correct the nominal top <br/> small current value to the adjusted regulated current, the rated minimum electrodeposition was this corrected
The flow value is output to the energization control circuit. And multiple combustors
When the tool switches from partial combustion to full combustion,
Open multiple valves to switch to multiple combustion
To the current value to the proportional control valve, according to the rated minimum fuel quantity
Change to a special minimum current value smaller than the rated minimum current value
When passing a proportional control valve, from its rated minimum current value
To the proportional control valve when the special minimum current value is also small
The current value will not be equivalent to the rated minimum fuel amount.
No. As a result, the constant based on the corrected rated minimum current value
By proportional control valve is controlled energized by rating minimum current value, the fuel in a plurality of precise rated minimum fuel quantity to the combustion device is supplied, a plurality of burner performs combustion of minimum combustion amount.
Further, the power supply control circuit according to the third aspect of the present invention provides
Between the corrected rated maximum current value and the corrected rated minimum current value
Between the rated maximum current value and the corrected
Calculate based on the corrected rated minimum current value.
The proportional control valve is energized in accordance with the current value obtained. to this
Therefore, between the rated minimum fuel amount and the rated maximum fuel amount,
An accurate amount of fuel is supplied to a plurality of combustion appliances.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [Configuration of Embodiment] A combustion apparatus according to the present invention will be described with reference to an embodiment shown in FIGS. FIG. 1 is a diagram showing a control device of the FF type gas hot air heater, and FIG. 2 is a diagram showing an entire structure of the FF type gas hot air heater.

The FF type gas hot air heater 1 includes a hot air duct 2, a convection fan 3, a combustion duct 4, a combustion fan 5,
The apparatus includes a gas burner 6, a heat exchanger 7, a gas supply path 8, and a control device 9. The warm air duct 2 is a warm air passage that draws room air from the inlet 10 and blows warm air from the outlet 11 toward the room. Inside this hot air duct 2,
A convection fan 3, a gas burner 6, and a heat exchanger 7 are provided. The convection fan 3 generates an airflow toward the room in the hot air duct 2, and changes the amount of air blown toward the room according to the supplied current value.
The combustion duct 4 is an air passage that sucks outdoor air from an intake port 12 opened outside and supplies combustion air toward the gas burner 6. A combustion fan 5 is provided in the combustion duct 4. The combustion fan 5 generates an airflow toward the gas burner 6 in the combustion duct 4, and sends the combustion air sucked from the combustion duct 4 and the fuel gas supplied from the gas supply path 8 to the gas burner 6. This combustion fan 5 also changes the amount of air to be supplied to the gas burner 6 according to the supplied current value.

The gas burner 6 is provided with a plurality of combustion appliances according to the present invention.
And a plurality of burners 13 to 15.
These burners 13 to 15 are respectively provided with combustion plates 16 to
The combustion duct 4 is connected to each upstream side. The heat exchanger 7 is connected downstream of the plurality of burners 13 to 15 and exchanges heat between combustion heat generated in any of the plurality of burners 13 to 15 and air passing through the hot air duct 2. To heat the air. An exhaust duct 7a for discharging combustion exhaust to the outside of the room is connected to the downstream side of the heat exchanger 7.

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

As shown in FIG. 1, the control unit 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. Having. The microcomputer 25 is an output operation circuit of the present invention, and includes an operation switch 31, a temperature setting device 32, a maximum output setting switch 33, a minimum output setting switch 34, a maximum output adjustment resistor 35, a minimum output adjustment resistor 36, and a temperature detection. Container 37
And electric signals from the thermocouple 38 and input current signals corresponding to these electric signals 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, Output to the sparker control circuit 30.

The operation switch 31 is a start switch of the FF type gas hot air heater 1. The temperature setting device 32 according to the present invention
The temperature setter sets a set temperature, and outputs an electric signal corresponding to the set temperature to the microcomputer 25. The maximum output setting switch 33 is used in the present invention.
Means for setting the maximum output of the gas burner 6 at the normally open contact point (= maximum combustion amount of the gas burner 6)
It is input when setting the rated maximum current value based on.
The minimum output setting switch 34 is a minimum output setting switch of the present invention.
This is a stage, and is supplied when a rated minimum current value based on a rated minimum gas amount to the gas burner 6 (= minimum combustion amount of the gas burner 6) is set at a normally open contact.

The maximum output adjusting resistor 35 is the maximum output adjusting resistor of the present invention.
The force adjusting means adjusts the rated maximum current value to the adjusted current value when the maximum output setting switch 33 is turned on with a variable volume. Minimum output adjustment resistance 36, the onset
A bright minimum output adjusting means for adjusting the rated minimum current value to an adjustment current value with a variable volume when the minimum output setting switch 34 is turned on. The temperature detector 37 is
The temperature detector according to the present invention, wherein the suction port 1 of the hot air duct 2
It is attached to 0. The temperature detector 37 detects a room temperature with a thermistor, and outputs an electric signal corresponding to the detected room temperature to the microcomputer 25. The thermocouple 38 is attached to the vicinity of the combustion plate 18 of the burner 14, and is a thermocouple made of a different kind of metal.
It is detected whether or not the gas burner 6 is performing abnormal combustion.

The microcomputer 25 calculates the required gas amount to the gas burner 6 from the set temperature output from the temperature setter 32 and the room temperature output from the temperature detector 37, and calculates a proportional valve so as to obtain the required gas amount. A current signal is output to the drive circuit 26 and the combustion fan control circuit 29 to switch the combustion amount of the gas burner 6. Specifically, it is determined based on the temperature difference between the room temperature and the set temperature, and is determined from the minimum combustion amount.
The combustion amount of the gas burner 6 is switched to eight stages in which the maximum combustion amount is added to seven stages up to the maximum combustion amount, and the strongest combustion amount performed when the room temperature is considerably lower than the set temperature during the ignition operation. That is, switches the combustion amount of the gas burner 6 by opening and closing the combustion fan 5 and the switching of the current value to the gas proportional control valve 21, and the third solenoid valve 24. When the maximum output setting switch 33 is turned on, the microcomputer 25 sends an output current corresponding to the rated maximum current value to the proportional valve drive circuit 26 to set the gas burner 6 to the maximum combustion amount (seven levels). outputs, modify the rated maximum current value in the adjustment current value adjusted by the maximum output adjustment resistance 35 (complement
Correct) and store it, and output the output current corresponding to the stored rated maximum current value to the proportional valve drive circuit 26.

Further, when the minimum output setting switch 34 is turned on, the microcomputer 25 sets a rated minimum value to set the gas burner 6 to the minimum combustion amount (one stage).
Outputs an output current corresponding to the current value to the proportional valve driving circuit 26, change the nominal minimum current value to adjust the current value, which is adjusted by the minimum output adjustment resistance 36 (corrected) to be stored, the rated minimum that the stored An output current corresponding to the current value is output to the proportional valve drive circuit 26. The microcomputer 25 changes the adjusted current value and stores the minimum combustion amount (1) based on the rated maximum current value and the rated minimum current value.
The output current is calculated from the first stage to the maximum combustion amount (eight stages).

The proportional valve driving circuit 26, a current supply control circuit of the present invention, based on the output current from the microcomputer 25, as shown in the graph of FIG. 3, the strongest burning the gas burner 6 from the minimum combustion amount to switch to the amount, the rated minimum electrodeposition current value supplied to the gas proportional valve 21
From the current value to the rated maximum current value, and special minimum current
Ru varied between from value to special maximum current value. Electric solenoid valve driving circuit 27, first according to the output from the microcomputer 25, controls the stop of the energization and energization of the second solenoid valve 22, 23. Note that the solenoid valve drive circuit 27 is configured as shown in FIG.
As shown in the graph, when the combustion amount of the gas burner 6 is switched from three stages to four stages, an instruction to change to four stages is issued.
(The proportional valve current becomes a current value corresponding to four steps.
At this time, the third solenoid valve 24 is energized so that all the burners 13 to 15 burn, and when the combustion amount of the gas burner 6 is switched from four stages to three stages, an instruction to change to four stages is issued.
(The proportional valve current becomes a current value corresponding to three stages.
At this point, energization of the third solenoid valve 24 is stopped so that combustion is performed only by the burner 13. Convection fan control circuit 28
Changes the current value supplied to the convection fan 3 based on the output current from the microcomputer 25. The combustion fan control circuit 29 changes the current value supplied to the combustion fan 5 based on the output current 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. The sparker control circuit 30 includes an operation switch 31
When the microcomputer 25 detects the input of
A current signal is input from the microcomputer 25 to energize the sparker 39 attached near the combustion plate 17 of the burner 14, and the energization of the sparker 39 is stopped after a lapse of a predetermined time after the energization.

The operation of the FF gas hot air heater 1 is shown in FIG.
A description will be given with reference to FIG. To adjust the rated maximum gas amount, the inspector first turns on (closes) the maximum output setting switch 33. Then, since the microcomputer 25 outputs the rated maximum current value to the proportional valve drive circuit 26, the proportional valve drive circuit 26 sets the rated maximum current value (the current value for setting the gas burner 6 to the maximum combustion amount (seven levels)). Gas proportional control valve 2
Flow to one coil. Therefore, the rated maximum current value ((max), see the graph of FIG. 3) flows through the coil of the gas proportional control valve 21. Therefore, the gas supply passage 8 is opened by an opening diameter corresponding to the rated maximum current value. Gas burner 6
The maximum rated gas amount of fuel gas is supplied to the gas burner 6
Performs combustion at the maximum combustion amount .

At this time, if the inspector determines that an accurate rated maximum gas amount has not been obtained, the inspector operates the maximum output adjustment resistor 35 to set it at an appropriate position. Then, since a current signal corresponding to the position of the maximum output adjustment resistor 35 is input to the microcomputer 25, the microcomputer 25 corrects the rated maximum current value to an adjustment current value based on the current signal. Set. Therefore, the corrected rated maximum current value is output to the proportional valve drive circuit 26, and 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. For this reason, since the correction current value ((Ia), see the graph of FIG. 3) flows through the coil of the gas proportional control valve 21, the gas burner 6 is opened by opening the gas supply path 8 by an opening diameter corresponding to the correction current value. The correct rated maximum gas amount is supplied to the fuel gas.

The adjustment of the rated minimum gas amount is performed by turning on (closing) the minimum output setting switch 34 and operating the minimum output adjustment resistor 36 in the same manner as the adjustment of the rated maximum gas amount. Correction current value [(min, Ib) FIG.
Flows through the coil of the gas proportional control valve 21. For this reason, the gas proportional control valve 21 opens the gas supply path 8 by an opening diameter corresponding to the correction current value, so that the fuel gas with the accurate rated minimum gas amount is supplied to the gas burner 6.

Here, this FF type gas hot air heater 1 is
When the room temperature is considerably lower than the set temperature during the ignition operation, the microcomputer 25 opens the third solenoid valve 24 until a predetermined time elapses after the ignition operation.
In both cases, the output current output to the proportional valve drive circuit 26 is fixed.
Increase to the special maximum current value that is larger than the rated maximum current value. This
As a result, the proportional valve drive circuit 26
By flowing a special maximum current value ((Ic) in the graph of FIG. 3) larger than the rated maximum current value ((max) in the graph of FIG. 3) through the coil, a special maximum gas amount exceeding the rated maximum gas amount can be obtained. The gas is supplied to the gas burner 6,
Is set to the strongest combustion amount (8 stages) to perform the rapid heating operation. Therefore, if the maximum output setting switch is
Rated by turning on the switch 33 and operating the maximum output adjustment resistor 35
Even after performing the rapid heating operation as described above after correcting the maximum current value, the FF gas hot air heater 1
The current value supplied to the gas proportional control valve 21 at the time of the special maximum gas amount output from the microcomputer 25 is the rated maximum value.
It does not correspond to the current value .

Further, the FF type gas warm-air heating apparatus 1, when switching the combustion amount of the gas burner 6 from the minimum combustion amount (1 step) to the strongest combustion quantity (eight stages), the minimum burning amount of combustion quantity (1 The first and second solenoid valves 2
With the valves 2 and 23 opened and the third solenoid valve 24 closed,
Further, the amount of combustion is switched by gradually increasing the current value flowing through the coil of the gas proportional control valve 21. That is, the combustion amount is switched using only the burner 13 among the plurality of burners 13 to 15.

[0031] Then, as shown in FIG. 4, when switching the combustion amount of the gas burner 6 in four stages from the third stage, Ma
The microcomputer 25 opens the third solenoid valve 24 and outputs an output current to the proportional valve drive circuit 26,
Once lower to the special minimum current value smaller than the rated minimum current value
You. Thereby, the proportional valve drive circuit 26 sets the current value flowing through the coil of the gas proportional control valve 21 to the special minimum current value ((min) smaller than the rated minimum current value (see the graph of FIG. 3)).
By lowering the current value [(Id) in the graph of FIG. 3] and then gradually increasing the current value flowing through the coil of the gas proportional control valve 21 with all of the plurality of burners 13 to 15 being used, the gas burner 6 so that will switch to the strongest combustion quantity (eight levels) of the combustion amount from 4 stages.

Therefore, if the minimum output setting switch 3
4 and operation of the minimum output adjustment resistor 36
After correcting the current value, the current value flowing to the coil of the gas proportional control valve 21 is temporarily reduced to the special minimum current value when the combustion amount of the gas burner 6 is switched from three stages to four stages as described above. The gas proportional control valve 21
The current value to be supplied becomes equivalent to the rated minimum current value is not Na. As on more than, the FF type gas warm-air heating apparatus 1, it is possible to output an appropriate output current in any circumstances from the microcomputer 25 to the proportional valve driving circuit 26, the rated maximum required originally adjusted The gas volume and the rated minimum gas volume do not deviate from the appropriate gas volume.

[Modification] In the present embodiment, an output setting switch which is turned on when setting the rated maximum current value or the rated minimum current value is separately provided. However, a switch of the temperature setting device and other switches are provided. May be operated at the same time by pressing a plurality of.

In this embodiment, the present invention is applied to the FF type gas hot air heater 1, but the present invention may be applied to another gas heater or a gas water heater. Further, the present invention may be applied to a combustion device using a liquid fuel such as kerosene as fuel. In the present embodiment, the gas proportional control valve 21 is applied as the proportional control valve. However, a proportional control valve having a gear motor that changes the opening diameter of the fuel supply passage according to the amount of electricity may be applied as the proportional control valve.

[0035]

According to the first and third aspects of the present invention , the switching valve is provided when the detected temperature is considerably lower than the set temperature.
And the special maximum fuel exceeding the rated maximum fuel amount.
Even supplies the postal amount into a plurality of burner, Ru can prevent the originally adjusted rated maximum fuel quantity necessary deviates from a proper value.

According to the second and third aspects of the present invention,
When multiple appliances switch from partial to full combustion
The switching valve is opened and the current to the proportional control valve is
Value is smaller than the rated minimum current value according to the rated minimum fuel amount.
Even in the case of the small size, it is possible to prevent the rated minimum fuel amount that originally needs to be adjusted from deviating from an appropriate value.

[Brief description of the drawings]

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

FIG. 2 is a schematic diagram showing the entire structure of the FF gas hot air heater according to the present invention.

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

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

[Explanation of symbols]

Reference Signs List 1 FF type gas hot air heater (combustion device) 6 Gas burner 9 Control device 13 Burner (combustion device) 14 Burner (combustion device) 15 Burner (combustion device) 21 Gas proportional control valve 25 Microcomputer (output operation circuit) 26 Proportion Valve drive circuit (energization control circuit) 32 Temperature setter 33 Maximum output setting switch (maximum output setting means) 34 Minimum output setting switch (minimum output setting means) 35 Maximum output adjustment resistance (maximum output adjustment means) 36 Minimum output adjustment resistance (Maximum output adjustment means) 37 Temperature detector

Claims (3)

(57) [Claims] 1. A plurality of combustion appliances for burning fuel
And (b) burning all of the plurality of combustion appliances when the valve is opened.
Switch to whole combustion, and when the valve is closed,
(C) a switching valve for switching to partial combustion for burning the part;
A proportional control valve to increase the amount of fuel supplied to the tempering device, the output operation for calculating (d) is a set temperature Toka et output current set by the detected temperature and the temperature setter detected by temperature detector <br / > circuits, and on the basis of the output current from the output processing circuit has a current control circuit for controlling a current value to be supplied to the proportional control valve, the detected temperature is kana than the set temperature
The switching valve is opened and the proportional control
A current value to be supplied to the control valve is supplied to the plurality of combustion appliances.
Special exceeding the rated maximum fuel amount Special according to the maximum fuel amount
Combustion equipment equipped with a control device that sets the maximum current value
There are, (e) the output operation circuit in response to the rated maximum fuel quantity
Maximum output setting means which is turned on when setting the rated maximum current value, and have a maximum output adjusting means for adjusting the rated maximum current value at the time of turn-on of the maximum output setting device, the maximum output setting means turned The rated maximum current value is corrected to an adjusted current value adjusted by operating the maximum output adjusting means , and (f) the energization control circuit corrects the rated maximum current value
A combustion device, wherein the proportional control valve is energized and controlled . 2. (a) A plurality of combustion appliances for burning fuel
And (b) burning all of the plurality of combustion appliances when the valve is opened.
Switch to whole combustion, and when the valve is closed,
A switching valve for switching the partial combustion of burning section, the current value (c) energizing increases, the proportional control valve to increase the amount of fuel supplied to said plurality of burner, in (d) Temperature Detector output calculation <br/> circuitry for computing the detected temperature detected and the set temperature Toka et output current set by the temperature setting unit, and on the basis of the output current from the output processing circuit, energizing the proportional control valve A current control circuit for controlling a current value to be applied , wherein the plurality of combustion appliances
When switching to combustion, while opening the switching valve,
The value of the current once energized to the proportional control valve is
Rated minimum current according to the rated minimum fuel amount to be supplied to the baking appliance
And a control device that sets a special minimum current value smaller than
In the combustion apparatus having, (e) the output operation circuit minimum output setting means which is turned on when setting the rated minimum current value, and the nominal minimum current at the time of turn-on of the minimum <br/> output setting means Adjust the value
Has a minimum output adjusting means, wherein when the minimum output setting means is turned on, the corrected nominal minimum current value to adjust the current value to be adjusted by operating the minimum output adjusting means (f) the The energization control circuit uses the corrected rated minimum current value.
A combustion device, wherein the proportional control valve is energized and controlled . 3. A plurality of combustion appliances for burning fuel
And (b) burning all of the plurality of combustion appliances when the valve is opened.
Switch to whole combustion, and when the valve is closed,
(C) a switching valve for switching to partial combustion for burning the part;
A proportional control valve for increasing the amount of fuel supplied to the baking appliance; and (d) a detected temperature detected by the temperature detector and a temperature setting device.
Output calculation to calculate the output current from the set temperature
Circuit and the output current from this output operation circuit
And an energization control circuit for controlling a current value to the proportional control valve.
And when the detected temperature is significantly lower than the set temperature,
When opening the serial switch valve together, the current value to be supplied to the proportional control valve, set to a special maximum current value corresponding to the particular maximum amount of fuel exceeding the rated maximum amount of fuel supplied to said plurality of burner, the Multiple burning appliances switched from partial to full combustion
The switching valve is opened and the proportional control
A current value to be supplied to the control valve is supplied to the plurality of combustion appliances.
Smaller than the rated minimum current value according to the rated minimum fuel amount
Combustion device having a control device for setting a special minimum current value
In, (e) the output operation circuit in response to the rated maximum fuel quantity
The maximum output setting that is input when setting the rated maximum current value
Setting means, when the maximum output setting means is turned on,
Maximum output adjusting means for adjusting the current value, the rated minimum current
Minimum output setting means that is input when setting the value, and
When the minimum output setting means is turned on, the rated minimum current value is
A minimum output adjusting means for adjusting the maximum output when the maximum output setting means is turned on.
Adjustment current value adjusted by operating the adjustment means
The rated maximum current value is corrected and the minimum output
When the setting means is turned on, the minimum output adjusting means is operated.
The rated minimum current
Corrected current values, (f) further constant that is corrected with the corrected maximum rated current value
The current value between the rated minimum current value and the corrected
Based on maximum current value and corrected rated minimum current value
And the energization control circuit calculates the current value
The proportional control valve is energized and controlled accordingly.
Combustion equipment.