JPH0735926B2 - Open combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an open combustion device such as an oil fan heater.

(B) Conventional technology Since this type of open combustion device discharges the exhaust gas from the burner into the room as warm air, a strong malodor is discharged from the warm air outlet along with the warm air during the fire extinguishing operation. The cause of the bad odor is that the vaporized gas such as kerosene that does not burn when extinguishing remains in the carburetor of the burner and changes into a gas with a strong odor when it contacts the high temperature heating part such as the burner head. It is due to.

Therefore, conventionally, as disclosed in Japanese Utility Model Publication No. 60-36833, there has been proposed a configuration in which the blowing direction from a convection fan for discharging hot air is reversed during a fire extinguishing operation. This method has an advantage that a bad odor at the time of extinguishing can be prevented from being directly sprayed on the user's face. However, since the bad odor is released from the indoor air intake to the room due to the reversal of the convection fan, an irritating odor remains in the room forever, which is not a drastic solution.

(C) Problems to be Solved by the Invention This invention has been made in view of the above-mentioned facts.
The purpose is to prevent unburned gas of the burner from coming into contact with the high-temperature heating part during fire extinguishing and being released together with warm air in the room to give off a bad odor.

(D) Means for Solving Problems In the present invention, a casing having a combustion air inlet, an indoor air inlet and a hot air outlet, and a warm air connecting the indoor air inlet and the hot air outlet in the casing A convection fan and a burner arranged in the passage, and an air supply fan arranged in an air supply passage connecting the combustion air intake and the hot air outlet in the housing, and exhaust gas of the burner from the hot air outlet. In the discharge-type open combustion apparatus, the convection fan is operated and the air supply fan is stopped during the extinguishing operation.

(E) Action When the convection fan is operated and the air supply fan is stopped during the fire extinguishing operation, the internal pressure of the burner and the air supply passage become negative with respect to the air pressure in the hot air passage. Then, the air in the warm air passage flows into the burner, and the unburned gas inside the burner is cooled while flowing backward in the air supply passage. Therefore, there is no fear that the unburned gas comes into contact with the high temperature heating portion of the burner and is discharged into the room with a bad odor.

(F) Examples Hereinafter, the present invention will be described in detail based on the examples shown in the drawings.

In FIG. 1 to FIG. 3, reference numeral 1 is a housing having a warm air outlet 2 on the front side, an indoor air inlet 3 on the rear side, and a combustion air inlet 4 on the lower side of one side. An air filter 5 is attached. A partition plate 6 divides the inside of the housing 1 into a hot air generating portion 7 and a tank housing portion 8 on the left and right sides. A combustion cylinder 9 having an open upper end, a premixed rotary gasification burner 10 facing the lower part of the combustion cylinder 9, and an air supply for connecting the combustion air intake 4 and the burner 10 to the warm air generating portion 7. A passage 11 and a heat shield plate 13 that defines a hot air passage 12 that connects the indoor air intake 3 and the hot air outlet 2 are provided, and the convection driven by a convection motor 14 is provided in the hot air passage 12. The fan 15 and the combustion cylinder 9 are interposed. In addition, the cartridge tank 16 has a cartridge tank 16
And the oil sump tank 17 are provided, and the cartridge tank
An appropriate amount of kerosene is being supplied to the oil sump tank 17 from 16. Further, an electromagnetic pump 19 that feeds kerosene from the oil sump tank 17 to the burner 10 via an oil supply pipe 18 is attached to the upper surface of the oil sump tank 17. The burner 10 is provided with a burner body 21 having a vaporization heater 20, a rotary atomizer 23 housed in a vaporization chamber 22 inside the burner body, and a burner head 24, and the kerosene fed from an oil feed pipe 18 is rotary atomized. After atomizing by the vaporizer 23, the atomized fuel is vaporized by using the heat of the vaporization heater 20 or the burner head 24, and the vaporized fuel and the combustion air from the air supply passage 11 are mixed to burner head 24. Is to be burned in. An ignition device 25 is attached near the burner head 24.

As shown in FIG. 3, an air supply fan 26 is provided on the burner 10 side in the air supply passage. This air supply fan 26 is an air supply passage
The combustion air 11 is pressurized and supplied to the burner 10, and is attached together with the rotary atomizer 23 to the rotary shaft 28 of the combustion motor 27 which is a DC motor.

FIG. 4 shows a control device for the above-mentioned open combustion device.

In FIG. 4, 29 is an AC power supply, 30 is a step-down transformer, 31
Is a DC power supply circuit, 32 is a control circuit such as a microcomputer, 33 is an operation switch, and the control circuit 32 is equipped with a vaporization heater 20 and a combustion motor 2 via relay switches 33 to 36.
7. The convection motor 14, the ignition device 25, and the electromagnetic pump 19 are energized and controlled. 37 is a combustion motor (DC motor)
27 is a drive circuit, 38 is a diode, 39 and 40 are resistors, and 41 is a capacitor.

Next, the operation of the apparatus of the above-described embodiment will be described.

When the operation switch 33 is turned on, the control circuit 32 first closes the relay switch 33, energizes the vaporization heater 20, and turns the burner 10 on.
Increase the temperature of the burner body 21 of. Then, when the burner body temperature exceeds a predetermined temperature, the relay switch 34 is closed, the air supply fan 26 is rotated by energization of the combustion motor 27, and the room air passes through the combustion air inlet 4 and the air supply passage 11 to burner the air. It is supplied to 10, and pre-purging is performed. When a predetermined time elapses after the relay switch 34 is closed, the relay switch 35 is closed and the convection motor 14 is energized, the convection fan 15 is rotated, and the indoor air is introduced into the warm air passage 12 through the indoor air intake 3. Introduce. Further, the relay switch 36 enters the normally open (NO) contact to energize the ignition device 25,
The electromagnetic pump 19 is also energized. For this reason, the sump tank
Kerosene is supplied from 17 to the burner 10, the mixed gas of vaporized gas and combustion air is ignited, and combustion is started. Then, the room air introduced into the warm air passage 12 hits the combustion tube 9 and is heated, and is mixed with the exhaust gas of the burner 10 and discharged from the warm air outlet 2 into the room. The relay switch 33 opens when the temperature of the burner body 21 is further increased by heat conduction from the burner head 24 to the burner body 21.

When the operation switch 33 is opened, the control circuit 32 stops combustion as follows. First, the control circuit 32 is a relay switch
36 is switched to a normally closed (NC) contact, the electric charge of the capacitor 41 is quickly discharged through the resistor 40, the electromagnetic pump 19 is stopped, and the fire is extinguished. Also, the relay switch 34 is opened,
The combustion motor 27 is stopped. Since the direct-current motor is used as the combustion motor 27, the air supply fan 26 stops immediately (in 2 to 3 seconds). Further, since the convection fan 15 continues to operate, the air pressure in the warm air passage 12 becomes higher than the pressure in the burner 10 and the air supply passage 11. And the vaporization chamber 22
The unburned gas of is not supplied to the burner head 24, and the air supply passage 11
Is cooled while flowing back. When the burner 10 and the combustion tube 9 are sufficiently cooled after the required time has passed since the operation switch 33 was opened, the relay switch 35 is opened and the convection motor 14 is stopped. In this way, during the fire extinguishing operation, the unburned gas inside the burner can be cooled in the air supply passage 11 without discharging hot air together into the room, and it is possible to prevent a bad odor from being emitted into the room.

(G) Effect of the Invention Since the present invention is configured as described above, it is possible to prevent the unburned gas of the burner from coming into contact with the high temperature heating part during fire extinguishing, and further being released into the room together with warm air, thereby extinguishing the fire. As a result, a comfortable open combustion device can be provided without the fear that a bad odor will be emitted indoors.

[Brief description of drawings]

1 to 4 relate to an apparatus according to an embodiment of the present invention. FIG. 1 is a sectional view and FIG. 2 is A- of FIG.
A sectional view of a portion along the line A ′, FIG. 3 is an enlarged sectional view of an essential part,
FIG. 4 is an electric circuit diagram of the control device. 1 ... Housing, 2 ... Warm air outlet, 3 ... Indoor air intake, 4 ... Combustion air intake, 10 ... Burner, 11 ... Air supply passage, 12 ... Warm air passage, 15 ... … Convection fans, 27 …… Supply fans.

Claims (2)

[Claims] 1. A housing having a combustion air intake, an indoor air intake and a hot air outlet, and a convection fan and a burner arranged in a hot air passage connecting the indoor air intake and the hot air outlet in the housing. And an air supply fan disposed in an air supply passage that connects the combustion air intake and the hot air outlet in the housing, and extinguishes a fire in an open combustion device that discharges the exhaust gas of the burner from the hot air outlet. An open type combustion device, which is configured such that the convection fan is operated and the air supply fan is stopped during operation. 2. The open type combustion device according to claim 1, wherein the drive motor of the air supply fan is a DC motor.