JPH0763322A - Catalyst combustion device - Google Patents

Abstract

PURPOSE:To permit the increasing of adjusting range of supplying amount of fuel gas in accordance with the temperature of exhaust gas of combustion as well as the manufacture of the device with inexpensive cost. CONSTITUTION:A catalyst combustion device is provided with a nozzle 5, injecting fuel gas from a gas bomb 2, a ventilating unit 4, ventilating air, a combustion unit 11, effecting the catalyst combustion of the mixed gas of fuel gas and air, a detecting means, detecting the temperature of exhaust gas of combustion, and a control unit, controlling the supplying amount of fuel gas into the nozzle 5 in accordance with the output of the detecting means. The detecting means is formed of a bimetal 62, installed in the passage of combustion exhaust gas under a condition of crossing the passage. The control means is installed near the free end of the bimetal 62 and is formed of a valve 6, driven by the deformation of the bimetal 62.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalytic combustion apparatus for catalytically burning fuel gas, and more particularly to a catalytic combustion apparatus used in a warm air heater for drying hair, clothes or body hair of pets using a gas heat source. It is about.

[0002]

2. Description of the Related Art Combustion of liquefied petroleum gas fuel such as propane and butane on the surface of a catalyst member has been used as a heat source, and has also been used as a heat source for hairsetters and warm air blowers. In addition, the combustion temperature of catalytic combustion is detected by a bimetal, and the combustion temperature is adjusted by controlling the amount of fuel gas supplied by the bimetal. For example, in JP-A-60-47841 and JP-A-3-21167, a coaxial bimetal that produces a linear displacement with a temperature change is used, and the linear displacement of the bimetal is used for fuel gas control. What moves the valve of is shown.

[0003]

However, the coaxial bimetal which performs linear displacement requires a small amount of displacement due to temperature change, requires a high degree of accuracy in its positioning, and drives a valve to generate a fuel gas. It is not possible to make a wide adjustment range when adjusting the supply amount of, and fine adjustment is difficult.
Further, the coaxial bimetal is formed by forming an inner ring and an outer ring of a high expansion material and a low expansion material, but it is expensive because it has a complicated structure and is difficult to process.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wide range of adjustment of the fuel gas supply amount according to the combustion exhaust gas temperature and to provide an inexpensive catalyst. Providing a combustion device.

[0005]

SUMMARY OF THE INVENTION The present invention, therefore, includes a nozzle for ejecting fuel gas from a gas cylinder, an air blower for blowing air, and a combustor for catalytically burning a mixed gas of fuel gas and air. Detection means for detecting the combustion exhaust temperature,
In a catalytic combustion apparatus having a control unit that controls the amount of fuel gas supplied to a nozzle by the output of the detection means, the detection means is formed of a bimetal installed in a passage of combustion exhaust gas so as to cross the passage. The control means is characterized in that it is formed by a valve installed near the free end of the bimetal and driven by deformation of the bimetal.

[0006]

According to the present invention, the most common form of bimetal can be used, and since the displacement amount due to temperature change is large, the adjustment range can be widened. At this time, it is preferable that a rotation adjusting type valve is used for a valve for adjusting the fuel gas supply amount, and a rotating lever provided in the rotation adjusting portion is engaged with the bimetal.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the illustrated embodiments. As shown in FIGS. 1 and 2, a housing 1 formed of a heat-resistant molded product or a light metal in two halves has a substantially cylindrical shape. It is composed of a wind tunnel portion 1a, a gas cylinder storage cylinder portion 1b adjacent to the wind tunnel portion 1a, and a battery storage cylinder portion 1c for storing a battery 3 as a power source, and is used for inserting the gas cylinder 2 of the gas cylinder storage cylinder portion 1b. A certain rear end opening surface and an opening for loading the battery 3 on the rear end surface of the battery housing cylinder portion 1c are closed by removable caps 1d and 1e, respectively.

An air blower 4, a nozzle 5, a cylinder 9, a combustor 11 and a wind tunnel 12 are housed in the wind tunnel 1a. The blower unit 4 is composed of a motor 40, a fan 41, and a rectifying fan 42. When the fan 41 is rotated by the motor 40, the air sucked from the suction port 26 of the rear end face of the wind tunnel 1a is blown into the wind tunnel 1a. Then, the air is finally discharged from the blowout port 27 on the tip surface of the wind tunnel 1a through the blower nozzle 28.

A nozzle 5 which is installed at the center of the wind tunnel 1a and ejects fuel gas from the ejection port at the tip is connected to the gas cylinder 2 via a relay pipe 71 and a valve unit 6. An electrode 81 is arranged near the nozzle 5. The electrode 81 forms an ignition part together with the piezoelectric device 80, and ignites a mixture of fuel gas and air by spark discharge between the electrode 81 and the nozzle 5.

As shown in FIG. 3, the cylindrical body 9 is formed of two front and rear members, and is located on the side of the air blower 4 and has a nozzle 5
The cylindrical body 90 on the rear side that surrounds the nozzle and holds the nozzle 5 by the support frame 93 has a shape that is narrowed toward the front. The front end of the tubular body 91 is squeezed and connected to the tubular body 90 to form a small-diameter premix throat portion 92, and the catalyst member 110 is disposed in the front end portion. To form the combustion section 11.
As the catalyst member 110, here, a ceramic or metal having good air permeability such as a honeycomb or a foam is used as a carrier, and a cylindrical member carrying platinum, palladium or the like is used.

The preheating flame diffusion plate 102, which is disposed in the tubular body 91 and is disposed between the catalyst member 110 and the nozzle 5 by the fixing member 101 and faces one end surface of the catalyst member 110, has a small diameter. It is composed of a net woven of metal wires or a non-combustible thin plate piece having a large number of small holes. The external flame of the flame ejected from the nozzle 5 at the time of starting, especially between the nozzle 5 and the combustion section 11. It is installed in the corresponding portion and prevents the flame emitted from the nozzle 5 from directly contacting the catalyst member 110 and also plays a role of uniformly diffusing the mixed gas over the entire surface of the catalyst member 110. The preheating flame diffusion plate 102 may be in a state in which a large number of nets, plate pieces, and the like are overlapped.

The hollow-cylindrical wind tunnel 12 is held on the inner surface of the wind tunnel 1a and surrounds the cylindrical body 9 with a space to form a ventilation path therebetween, and the housing 1 is protected from the radiant heat of the combustion section 11. It also serves as a heat shield for protection. Reference numeral 95 in the drawing denotes a support plate for holding the cylindrical body 9 in the wind tunnel 12 at a distance, and a pair of front and rear support plates 95, 9
5, one end of the bimetal 62 is fixed to the cut-and-raised portion from the support plate 95 on the blowout port 27 side, and the bimetal 62 is installed in a state of traversing the blowout port 27.

The gas cylinder 2 detachably loaded in the gas cylinder housing cylinder 1b has a built-in valve 20. When the gas cylinder 2 is inserted into the gas cylinder housing cylinder 1b, the internal valve 2 is inserted.
When 0 is opened, fuel gas is supplied to the valve unit 6 side arranged in the tip portion of the gas cylinder storage cylinder portion 1b. The valve unit 6 is capable of adjusting the supply amount of fuel gas by rotating the rotation adjusting unit in addition to turning on / off the supply of fuel gas to the nozzle 5. As shown in FIG. 5, a turning lever 61 protruding in the outer peripheral direction and a spring 63 formed of a torsion coil spring for biasing the turning lever 61 in one direction are attached. The on / off of the valve unit 6 is performed by axially driving the valve unit 6 via the switch lever 64 by the operation button 18 arranged on the front end surface of the gas cylinder housing portion 1b.

A rotating lever 61 is engaged with the free end of the bimetal 62 arranged in the outlet 27 by the urging force of the return spring 63. The bimetal 62 installed so as to traverse the passage of the combustion exhaust gas is deformed as shown in FIG. 4 according to the temperature of the combustion exhaust gas.
The rotation adjustment part of is rotated, and as a result,
The amount of gas ejected from the nozzle 5 is adjusted so that the combustion temperature during steady catalytic combustion can be kept constant.

When the operation button 18 is pressed, the valve unit 6 is opened via the switch lever 64 and the fuel gas is sent to the nozzle 5. Further, since the power switch interlocked with the operation button 18 is turned on, the air blowing unit 4 is started to start air blowing in a low air volume state, and the piezoelectric device 80 is operated to operate between the electrode 81 and the nozzle 5. The spark discharge ignites a mixed gas of the fuel gas ejected from the nozzle 5 and the air introduced from the blower unit 4 and introduced into the tubular body 90 to generate a flame.

The flame from the nozzle 5 causes the preheat flame diffuser plate 102 to become red hot, and the radiant heat causes the ambient temperature of the preheat mixing portion near the preheat flame diffuser plate 102 to be about 200 ° C. or higher and the catalyst in the combustion portion 11 to be heated. When the combustion becomes possible (usually, it takes about 10 seconds from the ignition), the bimetal 43 arranged on the outer surface of the tubular body 9 switches the switch 45 to stop the operation of the ignition part, and the blower part 4 normally blows air. Shift to the state. Due to the normal blow condition where the air volume is larger than that at the time of ignition,
Although the gas ratio and the air-fuel mixture flow velocity deviate from the range where the flame can be maintained and the flame is blown out, the temperature of the air-fuel mixture of the fuel gas and the air from the nozzle 5 is 200 ° C. while passing through the preheating flame diffusion plate 102. The temperature is increased to reach the catalyst member 110 of the combustion section 11, where it is catalytically burned to become high-temperature exhaust gas composed of carbon dioxide gas and steam, and flows to the downstream side of the combustion section 11. Once catalytic combustion starts in the combustion section 11,
The catalyst member 110 becomes red hot, and the radiant heat preheats the subsequent air-fuel mixture in sequence, so that the catalytic combustion in the combustion section 11 is maintained and continued. On the other hand, the premix throat section 9
Since there is no flame in the vicinity of 2, the surrounding temperature gradually decreases, and the bimetal 43 also returns to the initial position.

On the other hand, the high-temperature exhaust gas generated by the catalytic combustion in the combustion section 11 passes through the blow-out port 27 and the air-blowing nozzle 28 whose tip is narrowed, while passing through the tubular body 9 and the wind tunnel 12 in an annular cross-section. Stir-mixed with the air flowing through the channel 10
It becomes a suitable temperature around 0 ° C and is discharged to the outside. At this time, the bimetal 62 installed so as to traverse the passage of the hot exhaust gas reliably changes its displacement amount according to the temperature of the hot exhaust gas, and the displacement amount of this bimetal 62 is the largest. The rotation adjusting portion of the valve unit 6 is rotated through the rotation lever 61 with which the free end, which is a portion of the valve, is engaged to adjust the supply amount of the fuel gas. That is, when the temperature of the high-temperature exhaust gas becomes lower than that in the steady state, the bimetal 62 tries to separate from the turning lever 61, but the turning lever 62 follows by the bias of the spring 63,
Since the opening degree of the valve unit 6 increases and the gas supply amount increases, the combustion temperature in the combustion section 11 rises. On the contrary, when the temperature of the combustion section 11 becomes higher than that in the steady state, the bimetal 6
Since 2 pushes back the turning lever 61 against the spring 63, the valve unit 6 is throttled, the supply amount of fuel gas is reduced, and the combustion temperature in the combustion section 11 is lowered.

The combustion is stopped by pulling the operation button 18 again. At this time, the valve unit 6 immediately shuts off the fuel gas supply, but the blower unit 4 is stopped later. The structures of the bimetal 62 and the valve unit 6 are not limited to those of the embodiment described above. In short, the bimetal 62 installed in a state of traversing the passage of the combustion exhaust gas, and the bimetal 62 The valve unit 6 may be installed in the vicinity of the free end having the largest displacement and driven by the bimetal 62.

By the way, in the gas cylinder 2 filled with the liquefied gas used for this type, as shown in FIG. 7, the gas intake pipe 22 is usually made to have a length of about 1/2 of the length of the gas cylinder 2. , Full injection of liquefied gas 4
The gas tank 2 is filled to the full, so that the gas cylinder 2 can always supply the vaporized gas without dipping the tip of the gas intake pipe 22 in the liquefied gas in any posture. However, in this case, the capacity of the liquefied gas fuel becomes smaller than the volume of the gas cylinder 2. In this case, as shown in FIGS. 8 and 9, the gas intake pipe 2
2 is formed of a flexible tube such as a silicon tube, and a float 23 made of Styrofoam or the like is attached to the tip of the tube so that the tip opening surface of the gas intake pipe 22 may come out above the liquid surface of the liquefied gas. For example, even if the liquefied gas filling amount in the gas cylinder 2 is increased to about 90% of the full injection amount, only the vaporized fuel gas can always be taken out. It is possible to use a smaller gas cylinder 2 than that shown in FIG. Further, the float 23 also promotes vaporization of the liquefied gas (functions similar to boiling stone).

[0020]

As described above, according to the present invention, a bimetal is installed in a passage of combustion exhaust gas so as to traverse the passage, and a valve driven by the bimetal to adjust the supply amount of the fuel gas is provided. Since it is installed near the free end, the most common form of low-cost bimetal can be used, and since the displacement due to temperature change is large, the adjustment range can be wide. Yes, it is possible to adjust the fuel gas supply amount in a wide range and in a state where fine adjustment is possible.
When a rotary adjustment type is used for the valve for adjusting the fuel gas supply amount, and the bimetal is engaged through a turning lever,
The above adjustment becomes easier.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment.

FIG. 2 is an exploded perspective view of the above housing.

FIG. 3 is an exploded perspective view of the above.

FIG. 4 is a transverse sectional view of the above.

FIG. 5 shows a valve unit, (a) is a sectional view,
(b) is a front view.

FIG. 6 is a horizontal sectional view of the above.

FIG. 7 shows a gas cylinder, and (a), (b), and (c) are cross-sectional views in a horizontal state, an upright state, and an inverted state, respectively.

FIG. 8 is a perspective view showing another example of a gas cylinder.

9 (a), (b) and (c) are sectional views of the same horizontal state, upright state, and inverted state.

[Explanation of symbols]

 2 Gas cylinder 4 Blower part 5 Nozzle 6 Valve unit 11 Combustion part 62 Bimetal

Claims (2)

[Claims] 1. A nozzle for ejecting fuel gas from a gas cylinder, an air blower for blowing air, a combustor for catalytically burning a mixed gas of fuel gas and air, and a detector for detecting combustion exhaust temperature. In a catalytic combustion apparatus having a control unit that controls the amount of fuel gas supplied to a nozzle by the output of the detection means, the detection means is formed of a bimetal installed in a passage of combustion exhaust gas so as to cross the passage. The catalytic combustion device is characterized in that the control means is formed by a valve installed near the free end of the bimetal and driven by deformation of the bimetal. 2. The catalytic combustion device according to claim 1, wherein the valve is a rotation adjusting type, and a rotary lever engaging with the bimetal is fixed.