JPS6321088B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion reaction confirmation device for a combustion device using a catalytic burner.

A device for burning gas using a catalytic burner can be used, for example, in a gas stove. Such a catalytic burner requires sufficient preheating time to activate the catalyst at the start of combustion.

Conventionally, an electric or mechanical timer has been used to control the preheating time.

This invention automatically controls the preheating time of a catalytic burner using a thermocouple, and one embodiment of this invention will be described below with reference to the drawings.

In FIG. 1, 1 is a gas inlet, which passes through a gas tank 2 (first safety valve) with a safety valve and reaches a safety valve 5 (second safety valve). By operating the knobs 12 and 12a of the gas stove 2 and the safety valve 5, gas passes through the gas passage 13 for the main gas and pilot gas and the gas passage 14 to the heating burner.
The gas passes through the orifice 3 and reaches the catalyst mat 4 (catalyst burner), and further reaches the heating burner 7 via the gas nozzle 6.

The catalyst mat 4 is made by supporting a material having a strong catalytic effect against combustible gases, such as platinum, palladium, or rhodium, on a heat-resistant mat having a cotton-like thickness made of fibers such as alumina and silica.
A combustion reaction is obtained on the surface and inner layer of the mat through the catalytic effect of combustible gas and secondary air.

This heating burner 7 is necessary for activating the mat surface when the catalyst mat 4 is ignited.
8, 9, 10, and 11 are thermocouples close to the catalyst mat 4, respectively, and the thermocouples 8, 10 are connected in series to the coil of the gas tank 2, and the thermocouples 9,
11 is connected in series to the coil of the safety valve 5.

The operation will be explained below.

In FIG. 1, the gas tank 2 is in a closed state, and the gas has only reached the gas tank 2.

Next, as shown in FIG. 2, the knobs 12 and 12a are turned to supply gas to the gas passages 13 and 14, and the heating burner 7 is ignited by the ignition device linked to the gas stove 2. When the catalyst mat 4 is heated, the entire surface of the catalyst mat 4 starts to burn. Furthermore, since the thermocouples 10 and 11 are heated, the electromotive force thereof keeps the gas tank 2 and the safety valve 5 open.

In Figure 3, the heated and activated catalyst mat 4
starts to burn, but it is not all over the place, and as time passes, the combustion reaction starts over the whole area.
Electromotive force is also generated in thermocouples 8 and 9, and thermocouple 8 is connected in a direction that increases along with the electromotive force of thermocouple 10, and thermocouple 9 is connected in a direction that decreases the electromotive force of thermocouple 11. Eventually, it becomes impossible for the safety valve 5 to remain electrically open, and the heating burner 7 is extinguished. After that, the electromotive force of the thermocouple 10 decreases rapidly, but the electromotive force of the thermocouple 8 has already increased to the safety valve 2.
The combustion continues because it generates enough electromotive force to maintain the electrically open state.

4 and 5 are diagrams showing the electromotive voltages of thermocouples 8, 9, 10, and 11 and their composition.

As described above, according to the present invention, since the preheating heating burner burns until the preheating of the catalytic burner is completely completed, safe and reliable combustion can be obtained.
Furthermore, when the catalytic burner is inactive, only the heating burner burns continuously, so abnormal conditions can be seen at a glance and the release of raw gas can be prevented. Furthermore, when the heating burner is extinguished, it indicates that the catalytic burner has completely started combustion, so it can be used to confirm combustion.

[Brief explanation of the drawing]

Figures 1, 2, and 3 are block diagrams of a combustion device having a combustion reaction confirmation device according to an embodiment of the present invention, and Figures 4 and 5 are characteristic diagrams of thermocouples used in the device. . 4...Catalyst mat, 7...Heating burner, 8,
9,10,11...thermocouple.

Claims (1)

[Claims] 1. A catalytic burner, a first safety valve provided in a fuel passage to the catalytic burner to supply and stop fuel, and a heating burner that heats the catalytic burner;
A second safety valve is provided in the fuel passage to the heating burner to supply and stop fuel, and the outputs of one side heated by the catalytic burner and the other side heated by the heating burner are added to each other. a pair of thermocouples connected to open and close the first safety valve, one heated by the catalytic burner and the other heated by the heating burner, connected so that their outputs cancel each other out; A combustion device having a combustion reaction confirmation device including a pair of thermocouples that open and close a second safety valve.