JPH0650169B2 - Catalytic combustion device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a catalytic combustion apparatus for general households using liquefied petroleum gas.

2. Description of the Related Art Conventionally, this type of catalytic combustion device has a structure as shown in FIG. FIG. 3 shows a hair curler, in which 1 is a resistor, which functions to keep the amount of liquefied gas flowing out under the pressure of the tank 2 at a constant amount. The liquefied gas that has been pressed down in a certain amount receives heat from the surroundings and vaporizes. That is, this resistor 1
Is the liquefied gas vaporizer itself. The vaporized gas passes through the valve portion 3 and the nozzle 4 and is ejected from the minute holes 5 of about 60 μm, and the air is entrained from the surroundings by the holes 10 of the injector portion (gas: air about 1:30) and supplied to the catalyst 8. 6 and 7
Receives the heat of combustion of the catalyst 8 attached to the outside of the two pipes having different coefficients of thermal expansion, and the two pipes 6, 7
The combustion temperature is controlled by opening and closing the valve portion 3 of the nozzle 4 by the difference in thermal expansion. Reference numeral 9 is a wick, and 11 is an ignition device.

Problems to be Solved by the Invention In such a conventional configuration, the vaporizer always loses heat because the gas is vaporized, and the temperature is lowered. The heat is supplied only by heat conduction from the surroundings. Not done. Therefore, when the gas flow rate is increased, it cannot be compensated by the heat due to heat conduction from the surroundings, and the temperature becomes lower than the vaporization temperature of the liquefied gas (−10 ° C. for isobutane). This requires a simple structure in which the vaporizer is fixed to a part of the tank 2 made of resin, and the nozzle 4 is also inserted into a cylinder that uses a part of the tank 2, which is more remarkable. Come up. According to the experiment, tank 2
When 6-6 nylon is used as the material of the
At a gas flow rate of [50 cc / min], the temperature of the vaporization part is -10 ℃
The temperature reached -15 ° C, and the gas ejected from the nozzle 4 began to mix with the gas in a liquid state. When the gas is ejected in the liquefied state, the gas in the liquid state is vaporized by the heat of combustion from the surroundings when it reaches the catalyst, but when passing through the injector part on the way, it is still in the liquid state and its volume is Since it is extremely small compared to the state, it is not possible to entrain the required amount of air from the surroundings, and the gas-air mixture supplied to the catalyst has an extremely high gas ratio and lack of oxygen. In this state, there is a problem of incomplete combustion.

It is an object of the present invention to provide a catalytic combustion device capable of improving the incomplete combustion state when the gas flow rate is large and performing stable combustion.

Means for Solving the Problems A catalytic combustion apparatus of the present invention includes a vaporizer for vaporizing liquefied petroleum gas at a limited flow rate, and an injector device for mixing the gas vaporized by the vaporizer with air and supplying it to a catalyst. Is arranged to perform catalytic combustion, and the injector device is configured by a concentric double tube of a low expansion material inside and a good conductor of heat and a high expansion material on the outside to attach the catalyst to the outer expansion material and concentric. One end of the double pipe is connected to one end of the inner low expansion material and one end of the outer high expansion material, and the other end of the inner low expansion material is brought into contact with the valve portion of the vaporizer to control the gas flow rate, It is characterized in that the other end of the high expansion material is connected to the vaporizing portion of the vaporizer to supplement the catalyst heat.

Function According to this configuration, not only the heat due to heat conduction from the surroundings becomes vaporization heat, but also the heat is guided from the heat source to compensate for the lack of vaporization heat. It is possible to perform stable combustion without spouting. Also, the required amount of heat is determined by appropriately selecting the distance between the vaporizer and the catalyst and the thermal conductivity of the heat transfer body.
It can be set freely.

Embodiment FIG. 2 shows an embodiment of the catalytic combustion apparatus of the present invention.
The figure shows details of the nozzle and vaporizer of FIG. In FIG. 1, 20 is a wick that sucks up the liquefied gas 41 in the tank 42 by a capillary phenomenon. 21 is a semipermeable membrane with innumerable holes, which is a resistor that regulates the flow rate of the liquefied gas. Reference numerals 22 and 23 denote sleeve bodies and receiving fittings for pressing and sealing the semipermeable membrane 21, respectively, and 24 denotes a nozzle base, to which a high expansion pipe 25 which is a reference member of the temperature control mechanism is welded and fastened. A valve 26 is in contact with the inside of the nozzle base 24, and the temperature is controlled by opening and closing this portion to adjust the gas flow rate. valve
The force urging 26 is transmitted by a spring 27 via a support 28 to a nozzle 29 fitted with a valve. As shown in the figure, a lymph 30 having a hole penetrating therethrough and having a gas ejection port with a hole diameter of about 60 μm is fixed to the tip. Reference numeral 31 is an O-ring, which seals the gas. When the valve is opened, the gas is ejected at a high speed through the holes of the nozzle and through the holes of the lymph 30. A low expansion pipe 32 opens and closes the valve 26 depending on the position of the pipe.

In FIG. 2, the gas discharged from the nozzle entrains about 30 times the volume of the gas through the intake hole 33 formed in the low expansion pipe 32 (injector effect due to the flow velocity of the gas), the high expansion pipe 25, and the low expansion pipe. It is supplied to the catalyst 36 attached to the pipe 25 through the holes 34 and 35 formed in the expansion pipe 32. The gas supplied to the catalyst 36 is warmed to a temperature at which a catalytic reaction is possible by an ignition device 37 (for example, a heater by a battery), and catalytic combustion is started. The heat from the catalytic combustion is transferred to the heat pipe 38, and is used by the heat of the heat pipe 38 for the purpose of, for example, winding hair to curl hair or heating various things.

The combustion heat of such a catalyst also heats the high expansion pipe 25 and the low expansion pipe 32 at the same time. Both pipes 25, 32
Is fastened through the screw pedestal 39 and the adjusting screw 40,
The other end of the pipe 25 is fixed to the nozzle base 24.
Now, when both pipes 25 and 32 are heated at the same time, the surface of the pipe 32, which is in contact with the nozzle 29, moves in a direction away from the nozzle due to the difference in thermal expansion coefficient. Since the nozzle is biased by the spring 27, it moves in accordance with the movement of the pipe 32, the valve 26 hits the nozzle base 24, and the gas supply is cut off. When the temperature of the catalyst 36 drops, the surface of the pipe 32 in contact with the nozzle 29 moves in the direction of pushing down the nozzle 29, and gas supply is started again. This controlled temperature can be easily adjusted by adjusting the screw 40 to change the relative position of the pipes 25 and 32. Reference numeral 43 is a combustion gas shield plate, and 44 is a gas vent hole.

With this configuration, the heat generated by expanding the high expansion pipe 25 is transferred to the nozzle base 24. In the experiment, SUS321 was used as the high expansion pipe 25, and brass was used for the nozzle base 24. The heat due to vaporization is taken from the nozzle base 24 and the bracket 23,
This heat is supplied from the catalyst 36 through the high expansion pipe 25, and it is possible to prevent the temperature of the nozzle base 23 as a vaporizing part from decreasing. The amount of heat supplied through the high expansion pipe 25 is determined by the temperature of the catalyst 36, the distance between the catalyst 36 and the nozzle base 24, the shape and material of the high expansion pipe 25, and the like. Therefore, the required amount of heat can be set by determining these shapes.

Further, since the high expansion pipe 25 and the nozzle base 24 are directly fixed, the variable elements of temperature control are reduced, and more accurate temperature control becomes possible.

EFFECTS OF THE INVENTION As described above, the catalytic combustion apparatus of the present invention has a structure in which not only the heat due to heat conduction from the surroundings is vaporized heat, but also the heat is introduced from a heat source to supplement the shortage of vaporized heat. Even if the flow rate of is increased, the temperature of the vaporization part can be prevented from lowering, and liquid gas does not spout from the nozzle, and stable combustion can be performed. The required amount of heat can be freely set by appropriately selecting the distance between the vaporizer and the catalyst and the thermal conductivity of the heat transfer body.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part of an embodiment of the catalytic combustion apparatus of the present invention, FIG. 2 is a sectional view of a hair curler adopting the constitution of FIG. 1, and FIG. 3 is a sectional view of a conventional hair curler. Is. 24 …… Nozzle base, 25 …… High expansion pipe, 26 …… Valve, 29
...... Nozzle, 32 …… Low expansion pipe, 36 …… Catalyst, 37 ……
Ignition device, 40 ... Adjusting screw

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seiichi Nakata 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP 59-197206 (JP, A)

Claims (1)

[Claims] 1. A vaporizer for controlling the flow rate of liquefied petroleum gas to vaporize it, and an injector device for mixing the gas vaporized by the vaporizer with air and supplying it to a catalyst are provided for catalytic combustion. The injector device is composed of a concentric double tube of a low expansion material on the inside and a good conductor of heat and a high expansion material on the outside, and a catalyst is attached to the high expansion material on the outer side, and the inner low expansion is formed at one end of the concentric double tube. One end of the material and one end of the outer high expansion material are connected, the other end of the inner low expansion material is brought into contact with the valve portion of the vaporizer to control the gas flow rate, and the other end of the outer high expansion material of the vaporizer is connected. A catalytic combustion device, characterized in that the catalytic combustion device is configured to be connected to a vaporization section to replenish catalyst heat.