JP2755358B2 - Heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating apparatus for burning gaseous or liquid fuel and using the heat of combustion as a heat source, which is used for irons, steamers, cookers, coffee makers and the like.

[0002]

2. Description of the Related Art Conventionally, there are cordless hair curlers, hand warmers and the like as heat generating devices using heat of combustion as a heat source. These use butane gas or benzene as fuel, evaporate the fuel and mix it with air, then contact the mixed gas with a felt-like catalyst carrying a platinum catalyst to cause a catalytic reaction and reduce the heat of combustion. To use.

[0003]

The above combustor has a small amount of combustion and the combustion proceeds in a state where the temperature of the catalyst is low. However, if the amount of combustion is increased to increase the calorific value, the amount of mixed gas to be reacted in the catalyst layer increases,
The mixed gas cannot be completely reacted in the catalyst layer, and is discharged unburned. Therefore, in order to increase the amount of combustion, the area where the mixed gas comes into contact with the catalyst layer must be increased, which causes a problem that the combustor becomes large.

An object of the present invention is to provide a compact heating device having a small combustion chamber in order to solve the above-mentioned problems of the prior art.

[0005]

In order to achieve the above object, a heat generating apparatus according to the present invention comprises: a fuel gas / air mixing section;
A heating device provided with at least a housing having a combustion chamber inside provided downstream of the mixing section, wherein a plurality of fins are disposed substantially in parallel with a flow direction of a mixed gas from an upper surface and a lower surface of the combustion chamber. protrudes alternately provided, the gaps between the combustion chamber upper and lower surfaces fin tip and opposed to the fin tip provided, characterized in that a catalyst layer on the inner wall surface of the combustion chamber and the fin walls.

[0006]

According to the configuration of the present invention, a plurality of fins are provided alternately on the upper and lower surfaces of the combustion chamber substantially in parallel to the flow direction of the mixed gas, and the fin tip and the upper and lower surfaces of the combustion chamber are provided. the gap between the provided, by providing the catalyst layer on the inner wall surface of the combustion chamber and the fin walls, can be a combustion chamber is small compact heating apparatus. That is, by providing the fins in the combustion chamber and providing the catalyst layer on the outer wall surfaces of the fins, the area of the catalyst is increased without changing the size of the combustion chamber. Moreover, the fins in the combustion chamber are provided alternately on the upper and lower surfaces of the combustion chamber. In this manner, the premixed gas supplied into the combustion chamber is substantially uniformly dispersed in the combustion chamber by the fins provided in the combustion chamber, and passes through the combustion chamber. For this reason, the premixed gas efficiently contacts the catalyst surface. Therefore, there is almost no premixed gas discharged from the combustion chamber without contacting the catalyst surface, and the combustion efficiency is improved. Also provided on the fin wall
The catalyst layer is in direct contact with the combustion chamber wall, which is the heating surface.
Is not easily affected by fluctuations in the amount of heating on the heating surface.
The combustion temperature on the medium surface is maintained at a high temperature, and stable combustion is performed.
I can. Moreover, the fin tip burning at high temperature
Combustion heat from the catalyst layer surface on the end wall toward the combustion chamber wall
As the radiation is supplied, the temperature of the combustion chamber wall decreases.
Can be prevented. Therefore, the fluctuation of the heating amount of the heated object
The variations in the combustion temperature of the catalyst layer of the arising combustion chamber wall
Can be prevented.

Further, by providing the fins in the combustion chamber, not only the catalyst area but also the heat transfer area increases, so that the heat exchange efficiency of heating the object to be heated by the combustion heat on the catalyst surface is remarkably improved. Therefore, the size of the combustion chamber can be reduced.

[0008]

The present invention will be described more specifically with reference to the following examples. Catalytic combustion means that when a mixed gas of fuel and air is supplied to the surface of a catalyst layer that has been heated to the activation temperature in advance, the catalyst works near the surface of the catalyst layer, and the mixed gas is cooled at a lower temperature than in flame combustion. A combustion phenomenon that burns and produces an exothermic reaction. Therefore, in order to increase the combustion rate in catalytic combustion, it is important how to efficiently supply the mixed gas to the catalyst surface.

In such catalytic combustion, surface combustion occurs on the surface of the catalyst, so that the combustion temperature on the catalyst surface has a great influence on the combustion characteristics. On the other hand, since the outer wall surface of the combustion chamber supplies heat to the object to be heated as a hot plate, the combustion temperature of the catalyst surface may fluctuate due to a change in the amount of heating to the object to be heated. In the present invention, not only the inner wall surface of the combustion chamber, but also the heat of combustion on the catalyst surface in close contact with the outer wall surface of the fins is transmitted through the fins, conducted to the outer wall surface of the combustion chamber, and contributes to heating of the object to be heated. . Since the catalyst layer in close contact with the outer wall surface of the fin is not in direct contact with the heating surface, it is difficult to receive a change in the heating amount of the heating surface,
The combustion temperature on the catalyst surface is maintained at a high temperature, and stable combustion can be performed. In addition, since combustion heat is supplied as radiation from the surface of the catalyst layer burning at high temperature to the combustion chamber wall surface, fluctuations in the combustion temperature of the catalyst layer on the wall surface of the combustion chamber caused by fluctuations in the heating amount of the object to be heated are prevented. can do.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of one embodiment of the present invention. FIG.
FIG. 2 is a view taken in the direction of arrows AA in FIG. 1. In FIG. 1, reference numeral 1 denotes a liquefied gas cylinder such as propane or butane. A valve 3 is provided between the cylinder 1 and the nozzle 2.
To control the flow rate of fuel gas supplied from The fuel gas ejected from the nozzle 2 sucks the surrounding air by the attraction of the gas flow, is uniformly mixed in the mixing chamber 4, and is supplied to the combustion chamber 5. The combustion chamber 5 is provided inside a heat generating portion 6 formed of a metal housing.
A plurality of fins 7 are provided inside the combustion chamber 5 substantially parallel to the flow direction of the mixed gas, and the surface area of the combustion chamber 5 is increased without changing the size of the combustion chamber 5.

In the combustion chamber 5, a catalyst layer 8 is provided on a wall surface of the combustion chamber. As the catalyst supported on the catalyst layer 8, a platinum group metal and a metal oxide such as nickel, cobalt, iron, manganese and chromium are used, and particularly preferred are platinum group metals such as platinum, palladium and rhodium. If the thickness of the catalyst layer 8 is too large, it becomes difficult for the heat of combustion in the catalyst layer 8 to be supplied to the heat generating portion 6. If the thickness of the catalyst layer 8 is too small, the heat of combustion in the catalyst layer 8 is likely to be conducted to the heat-generating portion 6, causing a decrease in the combustion temperature during the catalytic combustion and poor combustion. Therefore, the thickness of the catalyst layer 8 is preferably from 0.3 mm to 2.0 mm. The thin platinum wire ignition heater 9 is heated by a dry battery (not shown), and the temperature of the catalyst layer 8 closer to the heater becomes higher. When the catalyst layer 8 is heated to the activation temperature, the valve 3 opens, and fuel gas is supplied from the nozzle 2 to the mixing section 4. The operation at this time may be performed by monitoring the temperature in the combustion chamber 5, or the valve 3 may be opened after a certain period of time has elapsed after the ignition heater 9 is energized. The air and the fuel gas, which are attracted to the injection power of the fuel gas and mixed, are mixed in the mixing section 4, and the mixed gas is supplied to the combustion chamber 5. In the combustion chamber 5, when the mixed gas of fuel and air is supplied to the surface of the catalyst layer 8 heated to the activation temperature, the mixed gas starts burning on the surface of the catalyst layer 8. Near the inlet of the combustion chamber 5, only the mixed gas supplied near the wall of the combustion chamber burns near the catalyst layer 8, but the mixed gas near the center of the combustion chamber 5 passes through the combustion chamber 5 unburned. Will pass. Therefore, as for the gas passing through the combustion chamber 5, the combustion gas flows near the wall surface, and the mixed gas flows inside the combustion gas.

Fins 7 are provided in the combustion chamber 5 substantially in parallel with the flow direction of the mixed gas.
0 is provided . Therefore, the mixed gas collides with the combustion surface 10a of the fin 7, and a part of the unburned gas in the mixed gas burns on the combustion surface 10a. The combustion gas burned in the vicinity of the combustion surface 10a and the inlet of the combustion chamber 5 and the unburned fuel gas are mixed and flow between the catalyst layer 10 adhered to the fin 7 and the catalyst layer 8 adhered to the inner wall surface of the combustion chamber 5. Become like At this time, since the high-temperature combustion gas and the unburned fuel gas are mixed, there is an effect of increasing the temperature of the fuel gas. As the heated fuel gas flows through the narrow gap between the catalyst layers 8 and 10, substantially all of the unburned combustion gas is burned.
Here, since a plurality of fins 7 are provided substantially in parallel in the combustion chamber 5, the premixed gas is substantially uniformly dispersed in the combustion chamber 5 by the fins 7 and passes through the combustion chamber 5. Become.
For this reason, the premixed gas efficiently contacts the catalyst surface. Therefore, there is almost no premixed gas discharged from the combustion chamber 5 without contacting the catalyst surface, and the combustion efficiency is greatly improved. In addition, since the fins 7 are alternately provided not only on one side of the combustion chamber 5 but also on the upper surface and the lower surface, the dispersibility of the premixed gas is further improved, and the premixed gas contacts the catalyst surface very efficiently. And the combustion efficiency is greatly improved. For this reason, according to the present embodiment, a compact heat generating device in which the combustion chamber 5 is small even when the amount of combustion is increased can be provided.

At this time, if the gap between the catalyst layer 8 and the catalyst layer 10 is too wide, the effect is lost. The experiment was conducted by bonding a fibrous porous material to an aluminum combustion chamber. It was confirmed that the effect was great when the gap with 10 was 4 mm or less.

The combustion gas generated on the catalyst surface is transferred to the catalyst layer 8.
Since the gas flows through the narrow gap between the fuel gas and the catalyst layer 10, the flow velocity of the combustion gas increases, the heat transfer coefficient on the combustion gas side increases, and the heat exchange efficiency in the heat generating portion 6 improves.

[0015] Since catalytic combustion involves surface combustion on the surface of the catalyst, the combustion temperature on the catalyst surface has a significant effect on combustion characteristics. On the other hand, since the outer wall surface of the combustion chamber 5 supplies heat to the object to be heated by the heat generating portion 6, the combustion temperature of the catalyst surface 8 may fluctuate due to a change in the amount of heating to the object to be heated. The present embodiment is applied not only to the inner wall surface of the combustion chamber 5 but also to the outer wall surface of the fin 7.
The heat of combustion on the surface of the catalyst layer 10 provided also propagates through the fins 7 and is conducted to the heat generating portion 6 on the outer wall surface of the combustion chamber 5 to contribute to heating of the object to be heated. Since the catalyst layer 10 in close contact with the outer wall surface of the fin 7 is not in direct contact with the heat generating portion 6, the catalyst layer 10 is hardly affected by a change in the heating amount of the heat generating portion 6, and the combustion temperature on the catalyst layer surface is maintained at a high temperature. , And stable combustion can be performed. Moreover, the catalyst layer 1 burning at high temperature
Since combustion heat is supplied as radiation from the surface 0 to the catalyst layer 8 on the wall surface of the combustion chamber, it is possible to prevent fluctuations in the combustion temperature of the catalyst layer 8 on the wall surface of the combustion chamber caused by fluctuations in the amount of heating of the object to be heated. .

The combustion gas cleanly burned in the combustion chamber 5 is discharged from an exhaust port 11. In addition, the heat generating unit 6 is provided with a temperature detecting unit 12. The temperature detection unit 12 monitors the temperature of the heating unit 6 and sends a signal to the valve 3,
Adjusting the opening of the valve 3 has the function of adjusting the amount of combustion. For this reason, the surface temperature of the heat generating portion 6 is kept constant, and the object to be heated can be heated at an optimum temperature.

As shown in FIG. 2, by providing a gap between the fin tip in the combustion chamber 5 and the wall surface of the combustion chamber, the upper surface 10b of the catalyst layer 10 and the catalyst layer provided on the inner wall surface of the combustion chamber 5 are provided. 8a. By doing so, the combustion heat is supplied as radiant heat from the catalyst layer 10b at the tip of the fin 7 to the catalyst layer 8 on the inner wall surface of the combustion chamber 5. Moreover, since the fins 7 are alternately provided on the upper surface and the lower surface of the combustion chamber 5, the radiant heat from the catalyst layer 10 provided on the fins is supplied to substantially all the inner wall surfaces of the combustion chamber 5. For this reason, it is possible to prevent a change in the temperature of the catalyst layer 8 on the wall surface of the combustion chamber caused by a change in the heating amount of the object to be heated, prevent a decrease in the combustion temperature on the surface of the catalyst layer, and maintain the activity of the catalyst. be able to.

Therefore, good combustion characteristics can be maintained even with fluctuations in the amount of heating, and a compact heat generating apparatus with a small combustion chamber can be provided.

[0019]

As described above, the present invention comprises a mixing section for fuel gas and air, and a housing provided downstream of the mixing section and having a combustion chamber therein, and is parallel to the flow direction of the mixed gas. A plurality of fins are alternately provided on the upper and lower surfaces of the combustion chamber, a gap is provided between the fin tip and the upper or lower surface of the combustion chamber, and a catalyst layer is provided on the wall surface of the combustion chamber and the fin wall surface, so that a catalyst can be efficiently provided. The fuel gas is brought into contact with the surface of the layer, and a change in the catalyst temperature caused by a change in the amount of heating in the heat generating portion is prevented.

[Brief description of the drawings]

FIG. 1 is a horizontal sectional view of a heat generating device according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the same device of the present invention (a view in the direction of arrows AA in FIG. 1).

[Explanation of symbols]

 2 Nozzle 4 Mixing part 5 Combustion chamber 6 Heating part 7 Fin 8, 10 Catalyst layer

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kyoko Itaya 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-5-231623 (JP, A) JP-A-58- 49809 (JP, A) Japanese Utility Model Showa 57-36415 (JP, U) Japanese Patent Publication No. 43-25876 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) F23D 14/00-14 / 18 F23D 14/26-14/84 F23C 3/00 F23C 11/00 306 F23D 11/40

Claims (1)

(57) [Claims] 1. A heat generating apparatus comprising at least a housing having a mixing section of fuel gas and air and a combustion chamber provided downstream of the mixing section, and substantially parallel to a flow direction of the mixed gas. Whether a plurality of fins are on the upper and lower surfaces of the combustion chamber
And alternately protruding into the combustion chamber, a gap is provided between the fin tip and the upper and lower surfaces of the combustion chamber opposed to the fin tip , and a catalyst layer is provided on the combustion chamber wall and the fin wall. Heating device.