JP2006275358A - Control device for warm air heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce costs for components relating to a thermo switch and assembling work. <P>SOLUTION: In this warm air heater provided with a burner 19 and a heat exchanger 23 in a housing having an air suction opening and a warm air supply opening, and comprising a combustion chamber faced to the burner, and a convection fan 28 for heating the air sucked from the air suction opening by the heat exchanger and discharging the same from the warm air supply opening, the burner comprises a control portion for controlling the combustion of the burner on the basis of a temperature detected by a temperature detecting portion 30 detecting a temperature of the burner, and operating the convection fan 28 for a prescribed time when a power source detecting portion 37 mounted to detect the presence or absence of power connection, detects the power connection, and the detected temperature of the temperature detecting portion 30 is higher than a prescribed temperature. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a control device for a hot air heater using gas or kerosene as fuel.

In recent years, in this type of hot air heater control device, a microcomputer is used as a control means, and precise combustion control has been performed. In addition, by installing a bimetal thermo switch on the heat exchanger, etc., and detecting the residual heat of the heat exchanger, etc. when the operation is stopped or restarted after the operation is stopped, the convection fan is operated, thereby heating the hot air It prevented failures and accidents due to overheating inside the machine. (For example, see Patent Document 1)
Japanese Utility Model Publication No. 55-69257

  However, this conventional device has a problem that it is necessary to reduce the cost due to the decrease in the selling price.

  Therefore, in order to solve the above problems, the present invention provides a burner and a heat exchanger in a casing having an air inlet and a hot air outlet, and a combustion section facing the burner, and the air inlet. In a hot air heater provided with a convection fan that heats the air sucked from the mouth with a heat exchanger and discharges it from the hot air outlet, the burner is a temperature detected by a temperature detector that detects the temperature of the burner Is provided with a power detection unit that detects whether or not power is turned on, and when the power detection unit detects power on and the detected temperature of the temperature detection unit is equal to or higher than a predetermined temperature, a convection fan And a control unit that operates for a predetermined time.

  Further, in claim 2, a burner and a heat exchanger are provided in a housing having an air inlet and a hot air outlet, and a combustion part facing the burner and air sucked from the air inlet are exchanged by a heat exchanger. In the hot air heater provided with a convection fan that is heated and discharged from the hot air outlet, the burner is controlled by the temperature detected by the temperature detection unit that detects the temperature of the burner, and after the operation is stopped When the temperature detected by the temperature detection unit is less than or equal to a predetermined temperature during the re-operation, the operation of the convection fan is started after a predetermined time A. When the temperature detected by the temperature detection unit is higher than the predetermined temperature, the predetermined time B shorter than the predetermined time A And a controller for starting operation of the convection fan later.

  As described above, according to the present invention, by eliminating the thermoswitch, it is possible to reduce the cost of thermoswitch-related parts such as the thermoswitch and connecting wires and assembly work, and use it for burner combustion control instead of the thermoswitch. By controlling the operation of the convection fan when the operation is stopped or restarted according to the temperature detected by the temperature detecting means in use, it is possible to prevent a malfunction or accident due to overheating inside the hot air heater.

  Next, an embodiment of the present invention will be described with reference to the drawings.

  1 is an apparatus main body of a warm air heater, a back plate 4 formed with a top plate 2 provided with various buttons and a display, a circular air inlet 3 and an exhaust hole (not shown), It consists of left and right side plates 5 and 6, a bottom plate 7 on the bottom surface, a front panel 9 provided with a hot air outlet 8, and a leg 10 provided at a corner of the bottom surface of the bottom plate 7. It is installed indoors in a state where a space 12 is formed between the bottom plate 7 and the table 11.

  Reference numeral 13 denotes a tank heat shield plate having a substantially L-shaped cross section. The tank heat shield plate 13, the back plate 4, and the right side plate 6 form a storage space for a cartridge-type tank 14 that is detachably stored. The oil tank 15 is provided at the upper portion of the oil tray 15 for storing a certain amount of fuel oil supplied from the cartridge type tank 14.

  Reference numeral 16 denotes a combustion section, which surrounds a combustion flame and a burner 19 that vaporizes the fuel sent from the oil tray 15 by the fuel pump 17 and mixes and burns the combustion air blown from the combustion air blower 18. The outer cylinder 20 for guiding the high-temperature exhaust gas generated by combustion is integrated, and the opening of the burner 19 is fixed to the burner mounting base 21, and further, one end of the outer cylinder 20 is fixed to the burner mounting base 21. It is what has been.

  Reference numeral 22 denotes a heat exchanger, which is an air that is blown from the heat of the exhaust gas by passing the high-temperature exhaust gas that is communicated with the combustion unit 16 and guided by the outer cylinder 20 through the meandering exhaust gas passage. A heat exchanger 23 that efficiently exchanges heat, a relay heat exchanger 24 that connects the heat exchanger 23 and the outer cylinder 20 of the combustion section 16, and an exhaust pipe fitting 25 in an exhaust hole formed in the back plate 4. The exhaust pipe 26 having one end fixed from the inside of the device main body 1 is connected to the other end of the exhaust pipe 26 to be connected to exhaust the exhaust gas from the device main body 1, and is integrated with the combustion unit 16. In this state, it is detachably fixed in the device main body 1.

  Reference numeral 28 denotes a convection fan, which includes a propeller fan whose diameter is slightly smaller than the diameter of the air suction port 3 of the back plate 4 and a blower motor (not shown) for rotating the propeller fan. The center of the convection fan 28 is the back plate 4. It is fixed to the outside of the back plate 4 so as to coincide with the center of the air inlet 3.

A unit attachment plate 29 is attached to the upper surface of the bottom plate 7, and the integrated combustion unit 16 and heat exchanger unit 22 are detachably fixed to the attachment surface.
The combustion unit 16 includes a temperature detection unit 30 including a thermistor sensor and the like, and the fuel pump 17 and the combustion air blower 18 are controlled according to the detection value of the temperature detection unit 30, and at the time of power failure recovery and operation. Operation control of the convection fan 28 at the time of re-operation after the stop is performed.

31 is a control unit formed of a printed circuit board or the like, and an operation unit 33 having switches such as an operation switch 32 on the input side, the temperature detection unit 30 and sensors such as a room temperature sensor 34 are connected to the output side. The fuel pump 17, the combustion air blower 18, the convection motor 35 that drives the convection fan 28, and a display unit 36 that displays the operation state by lamps or the like are connected.
Reference numeral 37 denotes a power supply detection unit provided in the control unit 31 for confirming the presence or absence of a power supply when a power failure is restored or a power plug (not shown) is inserted.

Next, the combustion operation of this hot air heater will be described.
First, when the operation switch 32 provided on the top plate 2 is pressed, an operation operation is started, the heater of the burner 19 is energized to increase the temperature, and the temperature of the temperature detection unit 30 provided in the burner 19 is preset. When the temperature rises, the fuel oil is supplied from the fuel pump 17 to the burner 19, and the combustion air is supplied from the combustion air blower 18 to the burner 19, whereby the fuel oil and the combustion air are premixed in the burner 19. As a result, the air-fuel mixture is ignited at the upper part of the burner 19 and blown out from a flame hole portion (not shown) located in the outer cylinder 20 to start combustion.

  The convection fan 28 operates simultaneously with the start of combustion, and the air blown by the convection fan 28 passes through the air suction port 3 of the back plate 4 from the back of the device body 1 and exchanges heat with the heat exchanger 23. The hot air is blown out from the hot air outlet 8 of the front panel 9.

Next, the return operation after a power failure will be described with reference to the flowchart of FIG.
If a power failure occurs during operation in ST1 or if the power plug is disconnected, the hot air heater is extinguished and stops all movements. (ST2)
If the power failure is restored in ST3 or if re-energization is detected by the power plug set by the power plug set, the process proceeds to ST4 and the temperature T of the combustion section is read by the temperature detector 30.

Next, in ST5, it is determined whether the combustion part temperature T is higher than 150 ° C. If it is higher than 150 ° C, the process proceeds to ST6, and it is indicated that the hot air heater is overheated immediately after a power failure. The error display etc. which display a power failure is performed on the part 36, the timer X start, the convection fan 28 start, the combustion air blower 18 start are performed, it is judged whether the timer X has passed 6 minutes in ST7, and 6 minutes have passed. Thus, the overheating in the warm air heater is sufficiently eliminated, so the convection fan 28 is stopped and the combustion air blower 18 is stopped in ST8, and the operation is completely stopped in ST10.
Further, when T is lower than 150 ° C. in ST5, it is determined that there is no need for cooling in the hot air heater, and a clock set is displayed on the display unit 36 in ST9. Stop.

Next, the reignition operation will be described with reference to the flowchart of FIG.
The operation switch 32 is pressed in ST11, the ignition operation of the combustion section is started in ST12, the timer Y is started in ST13, and the temperature T of the combustion section is read in the temperature detection section 30.

  Next, in ST14, it is determined whether the combustion part temperature T is higher than 130 ° C. If it is higher than 130 ° C, the process proceeds to ST15, and there is residual heat in the hot air heater, so a short 30-second delay operation is performed. Later, in ST17, the operation of the convection fan 28 is started, and hot air is blown out from the hot air outlet 8.

  On the other hand, if the combustor temperature T is 130 ° C. or lower in ST14, the process proceeds to ST16, and the remaining heat in the hot air heater is small. Therefore, the operation of the convection fan 28 is performed in ST17 after a normal delay operation of 60 seconds. Is started, hot air is blown out from the hot air outlet 8, and normal operation is continued in ST18.

Thus, the thermo switch attached to the heat exchanger or the like is abolished, and the temperature of the burner 19 detected by the temperature detection unit 30 used for temperature control of the combustion unit 16 is used as a substitute. It is possible to reduce the cost of thermoswitch related parts such as switches and connecting wires and assembly work.
In addition, by controlling the operation of the convection fan at the time of shutdown or re-operation according to the temperature detected by the temperature detection means used for burner combustion control instead of the thermo switch, It can prevent breakdowns and accidents due to overheating.

The perspective view which shows the warm air heater which attached | subjected one Example of this invention. The front view which shows the inside in the apparatus main body. Schematic of the control device. The flowchart figure at the time of the power failure. The flowchart figure at the time of the reignition.

Explanation of symbols

19 Burner 28 Convection Fan 30 Temperature Detection Unit 31 Control Unit 37 Power Supply Detection Unit

Claims (2)

  A burner and a heat exchanger are provided in a housing having an air inlet and a hot air outlet, and the combustion section facing this burner and the air sucked from the air inlet are heated by the heat exchanger, In the hot air heater provided with the convection fan to be discharged, the burner is controlled by the temperature detected by the temperature detection unit for detecting the temperature of the burner, and a power detection unit for detecting whether or not the power is turned on And a control unit that operates the convection fan for a predetermined time when the power detection unit detects power-on and when the detected temperature of the temperature detection unit is equal to or higher than a predetermined temperature. Control device for wind heater.   A burner and a heat exchanger are provided in a housing having an air inlet and a hot air outlet, and the combustion section facing the burner and the air sucked from the air inlet are heated by a heat exchanger, In the hot air heater provided with the convection fan to be discharged, the burner is controlled by the temperature detected by the temperature detecting unit for detecting the temperature of the burner, and the temperature is detected at the time of re-operation after the operation is stopped. The convection fan starts operating after a predetermined time A when the detected temperature of the section is equal to or lower than the predetermined temperature, and starts operating after a predetermined time B shorter than the predetermined time A when the detected temperature of the temperature detecting section is higher than the predetermined temperature. The control apparatus of the hot air heater characterized by including the control part to make.

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