JPS60149812A - Catalytic burner - Google Patents

Abstract

PURPOSE:To obtain a catalytic burner which can preheat even the whole of a catlyst, whose area is large, is simple in structure, cheap in price and is burnt catalytically reliably, by providing a diffuser plate and a flame hole plate supply ing evaporated fuel gas on the whole surface of the catalyst on an upstream of the catalyst. CONSTITUTION:Pressure of evaporated fuel gas streamed out from a fuel storage chamber 1 is made constant by a regulator 2 and supplied to a valve 3. Now, when a knob 9 is pressed to the last, evaporated fuel gas enters into the inside of a valve 3 through an inflow opening 15, streams out through an outflow opening 18, passes through a nozzle 4, sucks necessary air for combustion by an injector 5 and mixed evaporated fuel gas is spouted through a flame hole 8 provided on a downstream flame hole plate 7 by passing through a diffuser plate 6. Simultaneously with the above, a lever 10 sets a thermostat 11 through action of the knob 9 and makes an ignition terminal 13 discharge by bringing the same into contact with an ignition contact point 12. With this discharge, a flame is formed at the flame hole 8 and a downstream catalyst 14 is preheated evenly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a catalytic combustion device for general household use that uses catalytic combustion heat as a heat source.

Conventional configurations and their problems Conventionally, fuels that are gaseous at room temperature, such as hydrogen, methane, propane, and butane, have been molded using precious metals such as Pt and P(i) into glass fibers, foamed metals, and ceramino-peceramisoku. A catalytic combustion device is well known in which combustion is performed on a catalyst supported on a carrier made of carbon or the like, and this is used as a heat source.

To burn on a catalyst, the catalyst must be preheated.
As the preheating method, there are methods such as a heater, an external flame combustion bar, and preheating a mixture of fuel and air. However, in the case of a heater, preheating of a catalyst having a large area requires a large capacity of the heater, which is impossible when using a battery as a power source. External flame combustion burners are complex and costly, and preheating of the gas mixture is not possible due to the need for a heater for the reasons mentioned above.

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks, the present invention provides a catalytic combustion device 4 that can preheat the entire catalyst even if it has a large area, has a simple structure, is inexpensive, and reliably performs catalytic combustion.

Structure of the Invention To achieve this object, the catalytic combustion device of the present invention includes a flame hole plate provided with flame holes for forming a flame upstream of the catalyst, and a flame hole plate provided upstream of the flame hole plate to diffuse vaporized fuel gas over the entire surface of the catalyst. It consists of a diffuser plate, a valve that supplies vaporized fuel gas to the diffuser plate, and an ignition device that forms a flame above the flame hole.
The vaporized fuel gas supplied by the valve passes through the diffuser plate and is ejected from the flame hole. The flame hole is ignited by an ignition device to form a flame. The catalyst located downstream of the flame hole is evenly preheated by this flame. After completion of preheating, the supply of vaporized fuel gas is temporarily stopped by the valve, and after extinguishing the flame above the flame hole, vaporized fuel gas is supplied again. The vaporized fuel gas is diffused by a diffusion plate and supplied to the entire surface of the preheated catalyst, and catalytic combustion begins.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Figure 1 shows the configuration of a catalytic combustion device for a rice cooker according to the first embodiment of the present invention, and Figure 2 shows the operation of valves. 2 is a regulator that keeps the pressure of the vaporized fuel gas flowing from the fuel storage chamber constant; 3 is a valve that controls the flow of the vaporized fuel gas.

The vaporized fuel gas supplied from the valve 3 is ejected from the nozzle 4. The vaporized fuel gas ejected from the nozzle 4 attracts sufficient air necessary for combustion by the ejector effect of the injector 6, and the air and vaporized fuel gas are sufficiently mixed before being supplied to the diffusion plate 6. It passes through a diffuser plate 6 consisting of grooves or holes, and is ejected from flame holes 8 provided in a flame hole plate 7. At the same time, the knob 9 that operated the valve 3 is moved by the lever 10 to the center thermostat 1.
1, and by pushing the knob 9, the center thermostat 11 is set. 12 is an ignition contact which contacts the lever 10 and discharges the ignition terminal provided downstream of the flame hole plate 7. 14 is a catalyst in which PT is supported on ceramic cloth.

In the figure, 16 is an inlet into which vaporized fuel gas flows; 16 is a valve 17; an operation rod for operating an on-off valve 19 that opens and closes an outlet 18; and 20 is a through hole provided in the on-off valve 19. 21 is a support spring that supports the operating rod.

The operation of the catalytic combustion device for a rice cooker configured as above will be described below.

First, the pressure of the vaporized fuel gas flowing out from the fuel storage chamber 1 is made constant by the regulator 2, and then supplied to the valve 3. Now, when the knob 9 is pushed all the way, the valve 3 changes from the state shown in FIG. The air necessary for combustion is sucked in by the lid 5, and the mixed vaporized fuel gas passes through the diffusion plate 6 and is ejected from the flame hole 8 provided in the downstream flame hole plate 7.

At the same time, by operating the knob 9, the lever 10 sets the center thermostat 11, contacts the ignition contact 12, and discharges the ignition terminal 13. Due to this discharge, a flame is formed in the flame hole 8 and evenly preheats the downstream catalyst 14. When the knob 9 is released after a few seconds, the valve 3 is moved from the opening shown in FIG. 2 to the state shown in FIG. 2 by the support spring 21. Now, the ignition contact 12 and lever 1o are separated and the discharge stops. At this time, the on-off valve 19 closes the outlet 18, so the supply of vaporized fuel gas is stopped, and the flame above the flame hole 8 is extinguished. Further, the valve 3 is moved to the second state by the support spring 21, but the second state is maintained by the lever 1o and the knob 9 connected to the set center thermostat 11. In this state, the vaporized fuel gas passes through the through hole 2o provided in the on-off valve 19 and flows out from the outlet 18, so that the valve 3 always supplies vaporized fuel gas. Flame hole 8 where the flame went out
Then, the vaporized fuel gas diffused by the diffusion plate 6 is ejected again, and catalytic combustion starts on the surface of the preheated catalyst 14. When rice cooking is completed and the center thermostat 11 operates, the lever 1o and the knob 9 return to their original states, the valve 3 is placed in the state A by the support spring 21, and the inlet 16 is closed by the valve 17, allowing the vaporized fuel gas to flow out. supply will be stopped.

As described above, according to this embodiment, a flame is formed on the flame hole provided upstream of the catalyst, and after the catalyst is preheated by changing the ignition temperature by the flame, the supply of vaporized fuel gas is temporarily stopped and the flame is flamed. After extinguishing the flame above the hole, the vaporized fuel gas can be supplied again through the diffuser plate to the preheated catalyst for catalytic combustion.

A second embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a block diagram of the main parts of a rice cooker showing a second embodiment of the present invention. In the figure, 22 is a nozzle;
3 is an injector, 24 is an ignition 1/:f5 element, 26 is a catalyst, and L has the same structure as that shown in FIG. What is different from the configuration shown in FIG. 1 is the diffusion holes 2 provided in the diffusion plate 26.
7 has the function of a flame hole.

The operation of the catalytic combustion device for a rice cooker configured as described above will be described below. Preheat the catalyst immediately after starting rice cooking.
A flame is formed by the ignition terminal 24 on the diffusion hole 27 provided in the diffusion plate 26 to preheat the catalyst. The following operation is the same as the first embodiment.0 As described above, by giving the diffusion hole provided in the diffusion plate the function of a flame hole, the number of parts can be reduced, the structure can be simplified, and the cost can be reduced. A catalytic combustion device can be constructed.

In the examples, a catalyst using a cloth having a small heat capacity as a carrier is used, but a catalyst using a ceramic wool, a honeycomb, or a foam metal as a carrier, which has a small heat capacity, may also be used.

Moreover, although continuous discharge was used for ignition, it is needless to say that a piezoelectric type, a heater wire, etc. may also be used.

Effects of the Invention As described above, by providing a diffusion plate and a flame hole plate upstream of the catalyst to supply vaporized fuel gas to the entire surface of the catalyst, the entire surface of the catalyst is evenly preheated to the ignition temperature by the flame on the flame hole plate. However, since the firepower of the flame is strong, the preheating time is short, and there is no ignition error, making it possible to ignite quickly and safely, and its practical effects are outstanding.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a catalytic combustion device for a rice cooker according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a pulp of a rice cooker according to a first embodiment of the present invention, and FIG. 3 is a cross-sectional view of a pulp of a rice cooker according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the same essential parts in the second embodiment. 3...Valve, 6. Bug expansion plate, 7... Flame hole plate,
8... flame hole, 13... ignition terminal, 14...
...Catalyst, 25...Diffusion plate, 26...
Diffusion pore. Name of agent: Patent attorney Toshio Nakao and 1 other person
Illustration 2 (2) C1 fc) C2)

Claims (2)

[Claims] (1) A catalyst for causing an oxidation reaction between vaporized fuel gas and air, a flame hole plate provided upstream of the catalyst with flame holes for forming flames, a diffusion plate for diffusing vaporized fuel gas, and a flame hole for forming flames in the flame holes. and a pulp supplying vaporized fuel gas to the diffusion plate, and after forming a flame above the flame hole and heating the catalyst, the supply of vaporized fuel gas is temporarily stopped by the valve, A catalytic combustion device that extinguishes the flame and resupplies vaporized fuel gas for catalytic combustion. (2) The catalytic combustion device according to claim 1, wherein a flame is formed on the diffusion Ap, and a flame hole plate and a diffusion plate are used in common.