JPH0783406A - Combustion device - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a combustion device such as an indoor open-type warm air heater, and an object thereof is to reduce the odor at the time of ignition or extinction while improving the catalyst life. [Composition] In this combustion apparatus, a catalyst 11 for purifying the combustion unburned gas is arranged outside the rear opening of the duct 9, and
When the burner section 6 is ignited or extinguished, the combustion gas is temporarily passed through the catalyst 11.
Therefore, the combustion gas will pass through the catalyst only for a short time of ignition or extinguishment, so that the life of the catalyst is improved and
Since a catalyst having a low activation temperature can be used, a reliable odor reduction effect can be obtained even when the catalyst temperature is low, such as ignition or extinction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device such as a warm air heater which burns fuel and uses the heat for heating.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a combustion device of this type includes a burner portion 17 for vaporizing and burning fuel, and a combustion cylinder 18 for covering the burner portion 17 and guiding the combustion exhaust gas upward. The burner section is composed of a duct 20 that mixes the indoor air flow from a convection blower 19 provided behind the combustion cylinder 18 and the combustion exhaust gas to generate warm air, and an outlet 21 that blows out the warm air. The combustion heat generated in 17 is used for heating the room.

[0003]

However, in the above-mentioned conventional configuration, when the burner portion 17 is ignited or extinguished, ignition is delayed during ignition, residual unburned gas is generated during extinction, and local combustion occurs. When the balance is lost, carbon monoxide or combustion unburned gas is likely to be generated, and the combustion unburned gas comes into contact with a high temperature portion such as the combustion cylinder 18 of the device and is thermally decomposed to generate a strong odor. And the odor is discharged to the room as it is, giving the user anxiety and discomfort.
There was also a problem that was harmful to health.

Therefore, a structure in which a catalyst is attached to the upper portion of the combustion cylinder 18 to purify the carbon monoxide and the unburned gas has been considered, but this is in a normal combustion state.
Because it is exposed to the radiant heat of combustion of 7 and high temperature combustion gas,
The catalyst becomes extremely hot and its life is short, and the catalyst exposed to such high temperature is composed of materials with high active temperature such as metal in order to have heat resistance. Since the purification effect is generated only by itself, when the temperature of the catalyst is low at the time of initial ignition or when the catalyst is extinguished immediately upon ignition, carbon monoxide and unburned gas are not purified but are discharged as they are and diffused indoors. was there.

The present invention has been made to solve the above problems and has as its object to reduce the odor while improving the catalyst life.

[0006]

In order to achieve the above object, the present invention has a burner section for vaporizing and burning fuel, a combustion tube for covering the burner section and guiding the combustion exhaust gas upward, and this combustion tube. A duct that mixes the indoor air flow from the convection blower provided at the rear with the combustion exhaust gas to make warm air, an outlet that blows out the warm air, and a temporary burner ignition or extinguishing time. A control unit for stopping the convection blower is provided, and a catalyst for purifying the unburned combustion gas is disposed between the opening of the duct facing the convection blower and the hole of the main body case. Alternatively, when the fire is extinguished, the convection blower is temporarily stopped and the combustion exhaust gas is discharged through the catalyst by the draft of combustion gas, or when the burner is ignited or extinguished at the blowout port. Occasionally, an opening / closing means for opening / closing the blowout port is provided, and when the burner part is ignited or extinguished, the blowout port is temporarily closed to reverse the air flow from the convection blower so that the combustion exhaust gas is forced to pass through the catalyst. Configured.

[0007]

According to the present invention, the combustion gas during combustion is blown out into the room from the outlet without passing through the catalyst arranged outside the opening of the duct, but the convection blower is stopped at the time of ignition or extinction. The combustion gas passes through the catalyst in its draft and is released into the room, or the combustion gas passes through the catalyst by the backflow generated by closing the outlet and continuing to rotate the convection blower. Therefore, the odor can be significantly reduced without shortening the catalyst life. In particular, the combustion exhaust gas passes through the catalyst only for a short time at the time of ignition or extinguishing, and the catalyst is not easily affected by the radiant heat of combustion, and the combustion exhaust gas is emitted from the air inside the fuselage or the convection blower. The life is extended because it passes through the catalyst as it is diluted with the wind, and since it does not require much heat resistance, a catalyst with a low activation temperature can be used, and a reliable odor reduction can be achieved even when ignition or extinguishing has a low catalyst temperature. Can be achieved.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First, the configuration of an oil fan heater or the like using the combustion apparatus of the present invention will be described with reference to FIG. 1. Reference numeral 1 is a main body case, 2 is a fuel tank for holding fuel disposed on a side portion of the main body case 1, and A detachable cartridge tank 3 is arranged on the upper part. Reference numeral 4 denotes an electromagnetic pump which is disposed on the upper surface of the fuel tank 2 and whose lower suction port is immersed in the fuel in the fuel tank 2, 5 is an oil supply pipe, and 6 is the electromagnetic pump 4
A burner portion for vaporizing and burning the fuel supplied through the suction suction oil feeding pipe 5, and a combustion cylinder 7 for guiding the combustion exhaust gas upward is provided around the burner portion.

Reference numeral 9 is a duct that mixes the indoor air flow from the convection blower 8 arranged behind the combustion cylinder 7 and the above-mentioned combustion exhaust gas and discharges it as warm air from the blowout port 10. An opening 9 </ b> A is formed in the rear portion that faces 8.

Reference numeral 11 denotes the rear surface of the duct 9 and the tank storage wall 1A.
A catalyst for purifying combustion unburned gas disposed in a gap T between the burner portion 6 and the burner portion 6 located between the opening 9A at the rear of the duct and the exhaust hole 1B formed in the main body case 1.
At the time of ignition or extinction, the combustion exhaust gas temporarily passes through the catalyst 11 by its draft and is discharged into the room through the hole 1B.

Reference numeral 12 is the electromagnetic pump 4 and the convection blower 5.
As shown in FIG. 2, the control unit for controlling the energization of the engine is operated by receiving the output from the combustion control unit 13, and temporarily brakes the convection blower 8 during ignition and extinction. It is designed to stop this. In addition,
The combustion control unit 13 operates based on an operation start command from the operation switch 14, issues a combustion start command to the control unit 12 according to a predetermined program, and starts combustion.

In the above structure, first, fuel is supplied from the cartridge tank 3 into the tank 2 so as to maintain a constant oil level, and the fuel is sucked up from the tank 2 to the burner section 6 by the electromagnetic pump 4 via the oil supply pipe 5. Supplied. Then, it is burned in the burner section 6, and the flue gas is burned in the combustion tube 7.
It flows upward, is mixed with the indoor air flow from the convection blower 8 in the duct 9, is discharged as warm air from the outlet 10 and is used for heating.

Next, the operation during ignition and extinguishing will be described. When the operation switch 14 is turned on and a combustion start command is issued from the combustion control unit 13, the control unit 12 drives the electromagnetic pump 4 at a predetermined timing. The burner unit 6 ignites to start combustion, and after a few seconds, the convection blower 8 is driven, the combustion exhaust gas is mixed with the indoor air flow, and heating is started. When the operation switch 14 is turned off and the combustion control unit 13 issues a combustion stop command, the control unit 1
2 stops the driving of the electromagnetic pump 4, stops the fuel supply to the burner section 6 and stops the combustion, and at the same time, stops the driving of the convection blower 8 for several seconds to heat the exhaust gas by mixing the indoor air flow. After stopping, the device body 1 such as the duct 9 is cooled again by driving for a certain period of time.

When the burner portion 6 is ignited or extinguished, ignition is delayed during ignition, residual unburned gas is generated during extinction, or the combustion balance is locally lost, resulting in carbon monoxide or combustion. Unburned gas is generated, and the combustion unburned gas touches a high temperature part such as the combustion cylinder 7 of the device and is thermally decomposed to generate a strong odor, but since the convection blower 8 is stopped at that time, The gas is purified by passing through the catalyst 11 from the rear opening 9 of the duct 9 by the rise due to the draft, and is discharged into the room through the hole 1B. Therefore, it is possible to significantly reduce the odor generated by ignition or extinguishing and the machine. Further, since the catalyst 11 allows the combustion exhaust gas to pass only for a very short time at the time of ignition or extinguishing, the life of the catalyst 11 is extended. In particular, the catalyst 11 is located away from the burner section 6, does not receive radiant heat, and is not exposed to the high temperature combustion gas during combustion, and the combustion exhaust gas is also exposed to the air in the main body case 1. Since the catalyst 11 is thinned and passes through the catalyst 11, the life of the catalyst 11 is further extended. As a result, the catalyst 11 does not need much heat resistance and the catalyst 11 having a low activation temperature can be used. Even if the temperature of the catalyst 11 is low at the time of initial ignition or immediate extinction, carbon monoxide and unburned gas are not generated. It can be purified, and the user's feeling of use can be improved without diffusing carbon monoxide or unburned gas into the room.

Next, another embodiment will be described. The same parts as those in the above-mentioned embodiment are designated by the same reference numerals and only different parts will be explained. In FIG. 3, reference numeral 15 denotes an outlet opening / closing means arranged at the outlet, which temporarily closes the outlet 10 when the burner portion 6 is ignited or extinguished, and causes backflow of the convection blower 8 at that time to generate combustion exhaust gas. Are configured to pass through the catalyst 11. And the electromagnetic pump 4
As shown in FIG. 4, the control unit 16 for controlling the blower 8 and the convection blower 8 also controls the power supply to the outlet opening / closing means 15, and in this case, the outlet opening / closing means 15 controls the outlet 10. The convection blower 8 is configured to continue to be rotated even while the valve is closed. Next, the operation of the above configuration will be described. First, the operation switch 1
4 is turned on and a combustion start command is issued from the combustion control unit 13, the electromagnetic pump 4 and the convection blower 8 are driven by the control unit 12 at a predetermined timing, and the burner unit 6 ignites to start combustion. Then, after a few seconds, the outlet opening / closing means 15 is driven to open the outlet 10, the combustion exhaust gas is mixed with the indoor air flow, and heating is started.
That is, at the time of ignition, the blower 8 for convection rotates while the blow-off opening 10 is temporarily closed by the blow-off opening / closing means 15, and the combustion unburned gas generated at the ignition temple is duct 9
The gas flows backward toward the opening 9A, is forcedly passed through the catalyst 11, and is discharged into the room.

Also, when the operation switch 14 is turned off and the fire is extinguished, the control unit 12 stops driving the electromagnetic pump 4 and the burner unit 6
At the same time as stopping the combustion of the convection blower 8, the blowout port opening / closing means 15 is temporarily driven to keep the blowout port 10 closed while the convection blower 8 continues to rotate. Therefore, the air flow from the convection blower 8 is reversed. Combustion unburned gas is forced to the catalyst 11
Will pass through.

Therefore, according to this structure, the combustion unburned gas can be purified more surely than that of the previous method utilizing the draft of the combustion gas, and the combustion unburned gas when passing through the catalyst 11 can be obtained. Since the temperature can be set low, the life of the catalyst 11 can be improved.

In this embodiment, the case of simultaneously solving the problems at the time of ignition and extinguishing is explained as an example.
These may be solved separately, and the specific configuration may be any configuration as long as the object of the present invention is achieved.

[0019]

As described above, in the combustion apparatus of the present invention, the combustion gas during normal combustion can pass through the catalyst without passing through the catalyst, so that only the combustion gas during ignition or extinction can pass through the catalyst. The odor can be significantly reduced without lowering the odor. In particular, combustion exhaust gas should pass through the catalyst only for a very short time during ignition or extinguishing,
And the catalyst is not easily affected by radiant heat of combustion,
Furthermore, the combustion exhaust gas is diluted with the air inside the airframe or the wind from the convection blower and passes through the catalyst, so that the life is extended,
Moreover, since it does not require heat resistance so much, it is possible to use a catalyst having a low activation temperature, and it is possible to reliably reduce the odor even during ignition or extinguishing with a low catalyst temperature.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a warm air heater using a combustion device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a control unit of the combustion device.

FIG. 3 is a sectional view of a main part of a hot air heater using a combustion device according to another embodiment of the present invention.

FIG. 4 is a block diagram showing a control unit of the combustion device.

FIG. 5 is a cross-sectional view of a main part of a warm air heater using a conventional combustion device.

[Explanation of symbols]

 1 Main Body Case 1B Hole 4 Electromagnetic Pump 6 Burner Section 7 Combustion Cylinder 8 Convection Blower 9 Duct 9A Opening 10 Outlet Port 11 Catalyst 12 Control Part 15 Outlet Opening / Closing Means

Claims (2)

[Claims] 1. A burner section for vaporizing and burning fuel,
A combustion tube that covers the burner part and guides the combustion exhaust gas upward, and a duct that mixes the combustion exhaust gas with the indoor air flow from the convection blower provided behind the combustion cylinder to form warm air. An outlet from the hot air outlet and a control unit for temporarily stopping the convection blower when the burner unit is ignited or extinguished, and from the opening of the duct facing the convection blower to the hole of the main body case. A catalyst for purifying the combustion unburned gas is arranged between them, and when the burner is ignited or extinguished, the convection blower is temporarily stopped and the combustion exhaust gas is discharged through the catalyst due to the draft of the combustion gas. Combustion device configured to. 2. A burner section for vaporizing and burning fuel.
A combustion tube that covers the burner part and guides the combustion exhaust gas upward, and a duct that mixes the combustion exhaust gas with the indoor air flow from the convection blower provided behind the combustion cylinder to form warm air. And an outlet for blowing out the warm air,
A catalyst for purifying unburned combustion gas is disposed between the opening of the duct facing the convection blower and the hole of the main body case, and the outlet has the outlet at the time of igniting or extinguishing the burner. Combustion device configured to open and close the air conditioner and temporarily close the outlet when the burner part ignites or extinguishes air to reverse the air flow from the convection blower to force the combustion exhaust gas to pass through the catalyst. .