JPS61225549A - Gas combustion type hot air flow space heater - Google Patents

Abstract

PURPOSE:To prevent the connection line from being disconnected due to deficiency in cooling and a control part from making erroneous operations caused by damages and the like of a heat generating member by providing the heat generating body at a place at least one of a hot air flow path and a combustion air flow path. CONSTITUTION:A gas combustion type hot air flow space heater 1 comprises a combustion vent path 2 which causes air introduced from the outdoor to burn and exhausts it again out of the room, a gas inlet path 3 which caries out the gas supply into the combustion vent path 2, a hot air flow passage 4 which replaces indoor air with a combustion gas in said combustion vent path 2 and again discharges as a hot air flow an electronic control device, and a main body case 8 which accommodates them. Further, a power transistor 6 for controlling the rotation which is a heat generating body is fastened to an indoor air inlet path 402 of the hot air flow vent path 4 by means of screws. Accordingly, since the power transistor 6 for controlling the rotation is cooled by a blower 403 for the hot air flow, it is made possible to prevent the heat generating body from generating heat beyond necessity.

Description

[Detailed description of the invention] [Industrial application field] TECHNICAL FIELD The present invention relates to a gas-fired part ffl@f apparatus.

[Prior Art] Conventionally, a burner, an exhaust gas passage for discharging exhaust gas from the burner to the outside, a fan that faces into the exhaust gas passage and sucks exhaust gas and discharges it to the outside, and a In a forced exhaust combustion apparatus having a control section, the burner and the control section are separated by a partition plate,
A gas combustion type hot air heating device has been proposed, which has the following configuration: a cooling air passage communicating between the surroundings of the control section and the exhaust gas passage. The cooling air passage is a passage that cools the control unit. 3. [Problems to be solved by the invention] In the gas combustion hot air heating device having the above configuration, the entire control unit is cooled, but the inside of the control unit is cooled. It is difficult to cool the heat-generating member, and there is a risk of malfunction of the control unit due to disconnection of wires, damage to the heat-generating member, etc. due to excessive heat generation due to insufficient cooling of the heat-generating member.

An object of the present invention is to provide a gas combustion type m-air heating device that forcibly cools a heating element incorporated in a control device.

[Means for Solving the Problems] The gas combustion type hot air heating device of the present invention includes a hot air ventilation path that forms an indoor air inlet and a discharge port, and a warm air ventilation path provided in the hot air ventilation path. a combustion air passage forming an outdoor air inlet and an exhaust port, a combustion blower provided in the combustion air passage, a gas burner provided on the lee of the combustion blower, and the hot air air passage. a control device incorporating a heating element provided in at least one of the hot air blower and the combustion air passage, and controlling the rotational speed of at least one of the hot air blower and the combustion blower, and a main body case housing these. That is the composition.

[Actions and Effects of the Invention] The gas combustion hot air heating device having the above configuration has the following actions and effects.

Since the heating element is provided in at least one of the hot air ventilation path and the combustion ventilation path, the heating element incorporated in the control m+ device is forcibly cooled by at least one of the hot air blower and the combustion blower. Therefore, it is possible to prevent malfunctions of the control section caused by disconnection of wires, damage to the heating element, etc. due to excessive heat generation due to insufficient cooling of the heating element.

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

Gas combustion type hot air heating device (hereinafter abbreviated as gas hot air device) 1
includes a combustion ventilation passage 2 that burns air introduced from outside and discharges it outside again; a gas introduction passage 3 that supplies gas into the combustion ventilation passage 2; A hot air ventilation passage 4 that exchanges with combustion gas and discharges it again as hot air, an electronic control device 5 that drives and controls the combustion ventilation passage 2, the gas introduction passage 3, and the hot air ventilation passage 4, and these are housed. It consists of a main body case 8.

The combustion ventilation passage 2 includes an outdoor air introduction passage 201 formed with an outdoor air introduction port 209 that introduces air from outside the room, and an outdoor air introduction passage 201 that sucks outdoor air from the outdoor air introduction passage 201 to absorb the air and combustion gas in the combustion ventilation passage 2. Combustion blower 202 that flows
, a gas ejection nozzle 203 that ejects gas into the air sucked in by the combustion valve 202, and a gas barb on which a combustion flame is formed on a gas ejection surface 207 made of ceramic that combusts the gas mixture air. 204, a heat exchanger 205 that exchanges heat with the combustion gas combusted by the gas burner 204 and indoor air circulated through the hot air ventilation path 4;
The combustion gas after heat exchange with the heat exchanger 205 is guided outside,
It consists of an exhaust path 206 in which an exhaust port 208 is formed.

The gas introduction path 3 is provided upstream of the gas combustion supply pipe 301 that supplies gas to the gas ejection nozzle 203, and includes a main valve 302 that is opened and closed by energization, and a main valve 302 that is provided downstream of the main valve 302. a constant flow valve 304 that regulates the pressure of gas outflow and passage; a proportional control valve 305 that is provided downstream of the constant flow valve 304 and whose opening degree is variable by energization m; and an open/close state of the proportional control valve 305. The gas ejection nozzle 203 from upstream of the proportional control valve 305
and a gas bypass 307 through which a certain amount of gas flows out.

The hot air ventilation path 4 is formed in a hot air ventilation tube 4a equipped with a rotation control power transistor 6 as a heating element and a cement resistor 7 whose resistance part is made of cement 1 to the upper part. an indoor air introduction path 402 forming an indoor air introduction port 405 for introducing air into the gas hot air device 1;
A hot air blower 403 that sucks indoor air from the indoor air introduction path 402 and causes the air to flow in the hot air ventilation path 4, a heat exchange r:t205 of the combustion ventilation path 2, and a high temperature after heat exchange. and a hot air discharge path 404 formed with a hot air discharge port 406 for discharging the heated air.

The electronic control device M5 includes a power mocouple 501 that performs one-roll control of the rotational speed of the combustion blower 202, a combustion blower 202 of the combustion ventilation passage 2, a main valve 302 of the gas introduction passage 3, and a proportional control valve 305. , drives and controls the hot air blower 403 of the hot air ventilation path 4 and the like.

Further, the electronic control device 5 includes a rotation speed command circuit 5 that generates a rotation speed command signal according to the output of the thermocouple 501.
02 and the output from the pickup coil 503 for detecting the rotational speed of the combustion blower 202.
a rotation speed detection circuit 504 that generates a signal according to the actual rotation speed of the rotation speed, and a differential amplification circuit 505 that inputs signals from the rotation speed command circuit 502 and the rotation speed detection circuit 504.
The power transistor 6 for controlling the rotation of the combustion blower 202 is operated by the output of the differential amplification circuit 505, and the difference between the signals from the rotation speed command circuit 502 and the rotation speed detection circuit 504 becomes 0. The rotation speed of the combustion blower 202 is increased or decreased so that the thermocouple 501
The rotational speed of the combustion blower 202 is controlled to increase or decrease according to a predetermined proportional characteristic set by the rotational speed command circuit 502 by the change in the output of the combustion blower 202 .

Next, the operation of this embodiment will be explained.
A gas mixture air in which the gas ejected from 3 and the air introduced from 209 is mixed is introduced, and when the gas mixture air is ignited, a combustion flame is formed on the gas injection surface 207 of the gas barb 204. The gas injection surface 207 is heated to red heat by the combustion flame, and heat is emitted from the gas injection surface 207. This thermal radiation ω tends to increase in proportion to the amount of heat generated by increasing the amount of gas mixture air introduced into the gas burner 204. In this case, the thermocouple 501 above the gas indexing surface 207 is not only directly heated by the combustion flame but also heated by the heat emitted from the gas injection surface 207, so even if the flame temperature of the combustion flame itself does not change, the The output of the thermocouple 501 changes in accordance with the amount of heat generated due to an increase or decrease in the amount of heat radiation due to an increase or decrease in the time. Therefore, when the rotation speed of the combustion blower 202 is controlled to increase or decrease in accordance with the output of the thermocouple 501, the air volume of the gas mixture air is automatically adjusted to the air volume according to the actual calorific value of the gas burner 204, and the combustion blower When the rotation speed of the heat exchanger 202 increases, the temperature of the heat exchanger 205 increases, and when the rotation speed of the heat exchanger 202 decreases, the temperature decreases.By varying the warm air blower 403 in accordance with the temperature of the heat exchanger 205, the mJi temperature is always kept constant. It is maintained.

The power transistor 6 for rotation control is shown in FIGS. 4 and 5.
As shown in the figure, the indoor air introduction path 40 of the hot air ventilation pipe 4a
2 with screws 6a and 6b, and is fastened to a fastening plate 62 with openings 61 and screw holes 61a, 61b, and 61c through a thin insulating plate 63 with screw holes 63a formed with screws 6C. 64a
The rectangular portion 64 is formed with a large diameter portion 65a and a small diameter portion 65b.
A screw hole 65d is formed in the protrusion 65c of the terminal 6.
It consists of a main body 65 with protruding parts 6a, 66b, and 66c. A cement resistor 7 is also attached in the same manner.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of the gas combustion type hot air heating device of the present invention, FIG. 2 is a front sectional view of the gas combustion type hot air heating device of the present invention, and FIG. 3 is a side sectional view of the gas combustion type hot air heating device of the present invention. A front sectional view of the heating device and a circuit diagram of the electronic control device. FIG. It is an assembly diagram of the attachment part of the heating element concerning a wind heating device.

Claims (1)

[Claims] 1) A hot air ventilation path forming an indoor air inlet and an outlet;
A hot air blower provided in the hot air ventilation duct, a combustion ventilation duct forming an outdoor air inlet and an exhaust port, a combustion blower provided in the combustion ventilation duct, and a leeward side of the combustion blower. incorporating a gas burner provided in the heating element and a heating element provided in at least one of the hot air ventilation path and the combustion ventilation path,
A gas combustion type hot air heating device comprising a control device that increases or decreases the rotational speed of at least one of the hot air blower and the combustion blower, and a main body case that houses them. 2) The gas combustion hot air heating device according to claim 1, wherein the heating element is a power transistor. 3) The gas combustion hot air heating device according to claim 1, wherein the heating element is a cement resistor.