JPS618521A - Gas burning type warm air device - Google Patents

Abstract

PURPOSE:To prevent the gas burning chamber from explosion and contrive to stabilize rapidly the flame of a gas burner by a method wherein the opening degree of a proportional control valve is enlarged for fixed time after the detection of a gas flame. CONSTITUTION:At the detection of a flame by a flame detecting circuit, a timer circuit is operated, a convection blower 303 is disenergized for fixed time, also the output side of a temperature sensing element 502 for inputting to the first operating amplifier 503 is earthed for fixed time by the operation of the second timer part 494 and a transistor 495. Thereby, the voltage difference inputted to the first operating amplifier 503 is increased without regard to the output of the temperature sensing element 502, the first operating amlifier 503 generates the large output, the opening degree of the proportional control valve 205 is gradually enlarged via a delay circuit 507. By said operation, the flame can be rapidly stabilized by the heating due to the increasing of the flame of a gas burner 104. By the enlargement of the opening degree of the proportional control valve 205, the gas quantity required for the ignition can be secured, accordingly, the burning chamber can be prevented from explosion due to the gas supplying shortage.

Description

[Detailed Description of the Invention] [Field] The present invention is directed to heating a room such as an indoor room by 1° by combustion of gas.
Related to hot air equipment.

[Prior art] In a gas combustion hot air device, for a while after the switch is turned on, unheated or insufficiently heated cold air is discharged into the room by the hot air fan, so the temperature remains unchanged for a certain period of time after the switch is turned on. It is designed to stop the indoor ventilation of the Ju1 machine and discharge only the heated lagoon air after passing through the shuttle for a certain period of time. In this gas combustion hot air device, the amount of gas burned during a certain period of time during which air blowing is stopped after the switch is turned on is determined by the selected position of the temperature setting device. In addition, gas combustion parts such as gas burners have the disadvantage that the flame is not stable when they are cold, so for example, if the selected position of the temperature setting device is set to a low temperature, the amount of gas burned is small and the heating of the gas combustion part is There was a problem that the flame was not stable for a while due to the delay, and there was a concern that unburned gas would be released into the room, especially in the type that releases combustion gas indoors.

[Object of the invention] The object of the invention is to detect a gas flame for a certain period of time,
To prevent an explosion in a gas combustion chamber due to insufficient gas supply to a gas burner when the proportional control valve is opened by increasing the opening degree of a proportional control valve that controls the gas amount, and to heat the gas burner by increasing the flame of the gas burner. To provide a gas combustion hot air device that quickly stabilizes the flame of a gas burner.

1 Configuration of the Invention The gas combustion type hot air device of the present invention includes a gas burner, a proportional control valve that continuously controls the amount of gas supplied to the gas burner, and a proportional control valve that continuously controls the amount of gas supplied to the gas burner. A control circuit that controls the proportional control valve and ignites the gas burner by inputting a bypass that flows the amount of gas to the gas burner, a reference value set by a humidity setting device, and an output signal from a temperature sensing element that detects room temperature. and an electronic control circuit having a timer circuit that increases the opening degree of the proportional control valve by changing the reference value of the temperature setting device or the voltage value of the output signal of the temperature sensing element for a certain period of time. 1 [Effects of the Invention] The gas combustion hot air device of the present invention having the above configuration has the following effects.

b) For a certain period of time after detecting the gas flame, the flame of the gas parts is increased by increasing the opening of the proportional control valve that controls the gas amount and increasing the flame of the gas burner to heat the gas burner. It can be stabilized quickly.

By increasing the opening of the proportional control valve for a certain period of time after detecting a gas flame, the air inside the hot air fan can be quickly heated, and the heated air can be quickly discharged after the switch is turned on. In addition, it is possible to heat the room with the supplied power for a certain period of time, and quickly raise the temperature in the room.

c) Since the opening degree of the proportional control valve is increased after detecting the gas flame, the amount of gas necessary for ignition is secured when the proportional control valve is opened, so this is due to a lack of gas supply. It prevents explosions in the combustion chamber, ensures reliable ignition, and is extremely safe.

[Example] Next, the gas combustion vortex device of the present invention will be explained based on an example shown in the drawings.

Figures 1, 2 and 3 show an FF type in which outdoor air introduced from outside is mixed with gas and combusted, the combustion gas exchanges heat with indoor air, and the combustion gas is discharged outdoors again. A drawing diagram and an electronic circuit diagram of a gas hot air device are shown.

The FF type gas hot air device has a combustion air circulation path 1 for combusting air introduced from outside and then discharging it outside again, a gas introduction path 2 for supplying gas into the combustion air vfJ loop 1, and an indoor an indoor air circulation path 3 that exchanges the air with the combustion gas in the combustion air circulation path 1, cools it down, and discharges it again; and driving the combustion air circulation path 1, the gas introduction path 2, and the indoor air circulation path 3. and an electronic control circuit 4 that performs control.

Combustion air circulation path 1 introduces air from outside the room] Outdoor air introduction path 101 has a near filter, and outdoor air is sucked through the outdoor air introduction path 101, and the air and combustion gas in combustion air circulation path 1 are Combustion blower 10 that produces a flow of
2, a gas ejection nozzle 103 that ejects gas into the air sucked into the combustion blower 102, and a gas burner 104 made of ceramic that performs combustion of the gas mixture air.
A heat exchanger 105 exchanges heat between the combustion gas burned by the gas burner 104 and the indoor air circulated by the indoor air circulation path 3, and the heat exchanger 105 transfers the heat exchanged combustion gas to the outside. and an exhaust path 106 that guides the air.

The gas introduction path 2 is provided upstream of the gas combustion supply pipe 201 that supplies gas to the gas ejection nozzle 103, and includes a main valve 202 that is opened and closed by energization and de-energization, and a main valve 202 that is provided downstream of the main valve 202. , main valve 2
Safety valve 20 opened and closed by energization control like 02
3, a constant flow valve 204 is provided downstream of the safety valve 203 and regulates the pressure of gas circulation, and the opening degree is variable by energization ω! 1 - a proportional control valve 205 and a flow of a constant amount of gas flowing out from upstream of the proportional control valve 205 to the gas ejection nozzle 103 regardless of whether the proportional control valve 205 is opened or closed.
It consists of a gas bypass 207 having a joint screw 206, and a gas rich burner passage 209 which is a bypass provided on the lower surface of the gas burner 104 from upstream of the proportional control valve 205 and from which a certain amount of gas flows out from the ICC oxygen depletion vent 208. 5. The indoor air circulation path 3 converts indoor air into FF gas Hi
an indoor air inlet 302 having an air filter 301 to be introduced into the apparatus; a convection blower 303 that sucks indoor air from the indoor air inlet 302 and flows the air in the indoor air circulation path 3; It consists of a heat exchanger 1'05 of the combustion air circulation path 1 and a hot air outlet 304 that discharges high-temperature air after heat exchange.

The electronic Will 111 circuit 4 includes a spark electrode 401 that ignites a flame in the gas burner 104, a flame rod 402 that detects the flame on the surface of the gas burner 104, and a combustion blower 1.
02, the combustion blower 102 of the combustion air circulation path 1, the main valve 202 of the gas introduction path 2, the safety valve 203, the proportional control valve 205, and the convection of the indoor air circulation path 3. blower 3
03 etc. is driven and controlled.

The electronic control circuit 4 includes a power supply circuit 42 that converts the 100 volt alternating current distributed to general households into a constant voltage direct current, and a combustion blower drive control circuit 43 that drives the combustion blower 102 and controls its rotation speed. , a combustion blower rotation detection circuit 44 that detects the rotation of the combustion blower 102 from the combustion blower drive control circuit 43, an ignition rotation speed setting circuit 45 that sets the rotation speed of the combustion blower 102 at the time of ignition, etc. A spark detection circuit 46 that detects the spark state of the electrode 401 and the combustion blower rotation detection circuit 44 detect that the combustion blower 102 blows air within the combustion air circulation path 1 for a certain period of time when the main switch 404 is turned on. At the same time, after detecting a spark in the spark detection circuit 46, a flame is detected by an electromagnetic valve drive circuit 47 that energizes the main valve 202 and opens the gas combustion supply pipe 201, and a flame rod 402 installed above the gas burner 104. A flame detection circuit 48 that detects an ignition condition; a timer circuit 49 that starts when the flame detection circuit 48 detects a flame and outputs a high output for a certain period of time; and a timer circuit 49 that receives a high output from the timer circuit 49. In addition, a proportional control circuit 50 compares and amplifies the reference value obtained by the temperature setting device 5゜1 with the output signal from the temperature sensing element 502 that detects the room temperature, and controls the energization of the proportional control valve 205. , the temperature setting device 5< of the proportional control circuit 50
When the difference between the reference value obtained by 11 and the output signal of the temperature sensing element 502 reaches a certain value or more, the safety valve 20
3, a thermocouple amplifier circuit 52 that increases the output of the thermocouple 403 that controls the rotation speed of the combustion blower 102, and A combustion blower rotation speed setting circuit 53 that detects the oxygen supply state based on the output of the amplifier circuit 52 (by controlling the rotation speed of the combustion blower 102) and controls the rotation speed of the combustion blower 102 during gas combustion, and a thermocouple. The convection blower switching path 54 controls the air flow rate of the convection blower 3 (+3) by the output of the amplifier circuit 52; An abnormality circuit 56 that generates an output such as when the combustion blower 102, the main valve 202, and the spark electrode 401 are not energized; the flame detection circuit 48; and the temperature control judgment circuit 51.
The combustion blower 102, the main valve 202, the convection blower 30
3. An ignition sequence circuit 57 that controls energization of the spark electrode 401 and the like.

Next, a timer circuit 49 and a proportional control circuit 50, which are one embodiment of the present invention, will be explained.

When the flame detection circuit 48 detects a flame on the flame rod 402, the timer circuit 49 starts operating based on its output. The timer circuit 49 includes a 1-1 amparator 491, and a convection blower 303 for a certain period of time (for example, 30 seconds).
The second time period section 494 includes a first time period section 492 that de-energizes the circuit, and a second time period section 494 that has a second comparator 493 and generates a high output to the proportional control circuit 50 for a certain period of time (for example, 60 seconds). The output of the section 494 is connected to the output side of the temperature sensing element 502 of the proportional control circuit 50 and the transistor 495.
are connected via.

The proportional control circuit 50 includes a temperature difference amplification circuit 504 having a first operational amplifier 503 that compares and amplifies a reference value obtained by a temperature setting device 501 and an output from a temperature sensing element 502 that detects room temperature; a second operational amplifier 505; It has a third operational amplifier 506, a delay circuit 507 that delays the output of the first operational amplifier 503, and a fourth operational amplifier 508,
It consists of a proportional control valve drive circuit 509 that transmits the output delayed by the delay circuit 507 to the proportional control valve 205, and the output side of the temperature sensing element 502, which is input to the first operational amplifier 503, is connected to the collector 495C of the transistor 495. , the output generated by the second timer 494 is connected to the base 495B of the transistor 4950, and the emitters 495E of the transistors 1 to 495 are grounded.

In the evening, when the reflame detection circuit 48 detects a flame, the timer circuit 49 is activated, and the convection blower 303 is de-energized for a certain period of time, and the output side of the temperature sensing element 502, which is input to the first operational amplifier 503, is set to a second time period. The terminal 494 and the transistor 495 are operated to be grounded for a certain period of time.

As a result, the voltage difference input to the first operational amplifier 503 is greatly increased regardless of the output of the temperature sensing element 502, and the first operational amplifier 503 generates a large output. The opening degree of 205 is gradually increased.

FIG. 4, FIG. 5, and FIG. 6 show a configuration diagram, a block diagram, and an electronic control circuit diagram of a gas combustion apparatus according to another embodiment of the present invention.

This embodiment is an indoor open type gas hot air device (generally called a gas fan heater) that burns air sucked in from the room and discharges the combustion gas indoors again.

The indoor open type gas warm air device includes a combustion air circulation path 6 that introduces indoor air, combusts the introduced air, and discharges the combustion gas into the room again, and a combustion air circulation path 6 that supplies gas to the combustion air circulation path 6. an electronic control circuit 8 that drives and controls the combustion air circulation path 6 and the gas introduction path 7;
It consists of

The combustion air circulation path 6 includes an indoor air intake port 602 having an air filter 601 that introduces air from inside the room, and an indoor air intake port 602 that sucks air from the indoor air intake port 602 to remove the air and combustion gas in the combustion air circulation path 6. Convection blower 60 that performs flow
3, a gas mixing chamber 604 that mixes air and gas, a gas burner 605 that burns gas on the upper surface of the gas mixing chamber 604, and a combustion gas combusted by the gas burner 605 that mixes the indoor air. It consists of a mixing chamber 606 and a hot air discharge port 607 that discharges the air heated in the mixing chamber 606 as hot air.

The gas introduction path 7 includes a gas ejection nozzle 701 that ejects the gas in the gas mixing chamber 604, and a gas ejection nozzle 701 that ejects the gas from the gas mixing chamber 604.
A main valve 7 () is installed on the upstream side of the gas supply pipe 702 that supplies gas to the gas supply pipe 702 and is opened and closed by energization and de-energization.
3, a constant flow valve, such as a safety valve 704, which is provided downstream of the main valve 703 and is opened and closed by energization control like the main valve 103, and which is provided downstream of the safety valve 704, and which adjusts the pressure of the gas flow rate. 705, a proportional control valve ↑706 that is provided downstream of the constant flow valve 705 and whose opening level is varied depending on the amount of electricity supplied, and the proportional control valve 70.
6 lit regardless of IWI status, proportional control valve 706
A gas bar r path 108 having a flow rate adjustment screw 707 that suspends a constant gas from the upstream of the gas jet nozzle 701, and a small flame for oxygen deficiency provided from the upstream of the proportional control valve 106 to the lower surface of the gas burner 605. It consists of a gas-rich burner passage 710 which covers and flows out a certain amount of gas to the lower part 09.

The electronic control circuit 8 includes a spark 141i801 that ejects a spark from the upper surface of the gas burner 605 to ignite the flame, and a first thermocouple 8 that detects the flame on the upper surface of the gas burner 605.
02, a second thermocouple 803 that detects flame above the oxygen deficiency small fire lower 09, a convection blower 603 of the combustion air circulation path 6, a main valve 703 of the gas introduction path 7,
It drives and controls the Sefdi valve 704, proportional control valve 706, etc.

The electronic control circuit 8 includes a convection blower control circuit 82 that drives the convection blower 603 and controls its rotational speed, and a first thermocouple 802 on the upper surface of the gas burner 605.
A low-cut circuit 84 generates an output when the flame is weak based on the output of the flame detection circuit 83, and a high-cut circuit 85 generates an output when the flame is strong based on the output of the flame detection circuit 83. and an oxygen deficiency circuit 88 that detects the oxygen supply state of the gas burner 605 that detects the output of the second thermocouple 803 installed above the small fire lower 09 for oxygen deficiency, and generates an output when oxygen is deficient. A forced spark circuit 89 that generates an output for a period of time (for example, 6 seconds) and an ignition detection circuit 9 that detects ignition in the gas burner 605 from the output of the low-cut circuit 84
0, the low-cut circuit 84, the high-cut circuit 85, and the oxygen depletion circuit 88 detect the occurrence of an abnormal situation (insufficient gas amount, excessive gas amount, lack of oxygen), and if the abnormal situation continues for a certain period of time or more. an abnormality detection timer circuit 91 that detects the occurrence of an abnormality; an abnormality lock circuit 92 that receives the output of the abnormality detection timer circuit 91 and generates a signal indicating the occurrence of an abnormality;
A temperature difference amplification circuit 94 has an operational amplifier 943 that compares and amplifies a reference value obtained by a temperature setting device 941 and the output from a temperature sensing cable 942 that detects room temperature, and the output of the temperature difference amplification circuit 94 is connected to two operational amplifiers. 951.952, a proportional control valve drive circuit 96 receives the output of the delay circuit 95, and a proportional control valve drive circuit 96 receives the output of the ignition detection circuit 90, and detects ignition. A timer circuit 98 generates an output that cancels the output of the temperature sensing element 942 of the temperature difference amplification circuit 94 for a certain period of time (for example, 75 seconds) when the comparator 981 is activated.
When the ignition detection circuit 90 detects ignition, the timer circuit 98 is activated, and the low output of the timer circuit 98 causes the output of the temperature sensing element 942 to become low, and the operational amplifier 943 of the temperature difference amplification circuit 94 outputs a low signal. Since the input difference is increased, the proportional control valve 10 is closed for a certain period of time after ignition is detected.
6, the opening degree is increased.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a hot air device according to the present invention, FIG. 2 is a block diagram of an electronic control circuit used in the hot air device shown in FIG. 1, and FIG. FIG. 4 is a configuration diagram showing another embodiment of the hot air device according to the present invention, and FIG. 5 is an electronic circuit diagram of the timer circuit and proportional control circuit shown in FIG. The block diagram of the electronic control circuit used in FIG. 6 is the electronic circuit of the ignition detection circuit, temperature difference amplification circuit, delay circuit, proportional control valve drive circuit, and timer circuit shown in FIG. In the figure 4.8...Electronic control circuit 48.83...Flame detection circuit 49.98...Timer circuit 50
... Proportional control circuit 90 ... Ignition detection circuit 94.
504...Temperature difference amplification circuit 95.507...Delay circuit 96.509...Proportional control valve drive circuit 104
．． 605...Gas burner 205.706...Proportional control valve 207.708...Gas bypass 495...
・Transistor 501.941...Temperature setting device 50
2.942...temperature sensing element

Claims (1)

[Claims] 1) A gas burner, a proportional control valve that continuously controls the amount of gas supplied to the gas burner, and a bypass that allows a constant amount of gas to flow to the gas burner even when the proportional control valve is closed. , inputs the reference value set by the temperature setting device and the output signal from the temperature sensing element that detects the room temperature, and controls the control circuit for controlling the proportional control valve and the temperature for a certain period of time after the detection of ignition of the gas burner. A gas combustion type hot air device comprising an electronic control circuit having a timer circuit that changes a reference value of a setting device or a voltage value of an output signal of the temperature sensing element and increases the opening degree of the proportional control valve. 2) The gas combustion type temperature sensor according to claim 1, wherein the timer circuit cancels the output signal of the temperature sensing element for a certain period of time by an output generated by the timer circuit via a transistor. Wind device. 3) The gas combustion type hot air device according to claim 1, wherein the timer circuit cancels the output signal of the temperature sensing element for a certain period of time using an output generated by the timer circuit.