JPS599017B2 - Pilot burner for thermoelectric safety device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pie cap burner for a thermoelectric starter safety device.

The thermoelectric spark safety device (hereinafter referred to as the spark safety device), which is conventionally used in water heaters, etc., supplies gas to the piping head burner by opening the gas valve of the spark safety device by manual operation. The electromagnet excites the gas valve of the starter safety device with the electromotive force generated by heating the thermocouple independently fixed in close proximity with the flame of the pipe cap burner, and the gas valve of the starter safety device is self-maintained in the open state, and the flame is released. When the thermocouple is extinguished, the electromotive force of the thermocouple is erased and the gas valve is automatically closed, but there are many variations in response depending on the state of the flame, changes in the position of the thermocouple, etc.

Furthermore, the heating received by the thermocouple mounting member causes a delay in the response speed of gas valve closing when the flame is extinguished.

Also, when used in a windy environment, the heating of the thermocouple becomes intermittent due to the fluctuation of the flame of the pipe burner, and eventually the electromotive force becomes insufficient and the gas valve loses its ability to hold the gas valve open, causing the gas valve to close and release the gas. This can also cause malfunctions such as blocking roads.

Furthermore, since the pipe burner and thermocouple must be installed independently, the number of parts is large and the cost is high.

Furthermore, in recent years, as residential buildings have become more airtight, in order to prevent accidents due to oxygen deficiency when using gas burners indoors, we have introduced an oxygen deficiency prevention safety device that detects the drop in oxygen concentration and shuts off the gas path. Development is currently underway, and the above-mentioned fire safety device and thermocouple will be used.

Its operation is when the flame of the pie mouth burner drops to a certain oxygen concentration, lift (the flame moves away from the tinder) or blow-off (
This device eliminates the heating of the thermocouple by causing the flame to fly away from the crater and disappear, and closes the gas valve of the pilot safety device to cut off the gas path. These thermocouples are an impediment to the lift and blow-off mentioned above.

The present invention eliminates such drawbacks and relates to a pie cap burner that can quickly respond and reliably open, hold, and close the gas valve of a starter safety device.

An example of the present invention will be explained below with reference to the drawings.

Figure 1 shows an example of a conventional embodiment, where the pie mouth burner is the combustion tube 1.
A crater 2 is provided above, and the thermocouple 4 is fixed close to the flame 3 generated in front or around the crater 2 by appropriately blocking the upper part of the crater 2.
An electric circuit is formed in which the generated electromotive force is used by conductors 5 and 5' to excite a gas valve of a starter safety device (not shown) using an electromagnet to open and hold the gas valve.

6 is a mounting member for the thermocouple 4.

FIG. 2 is a perspective view of the present invention, FIG. 3 is a side sectional view, FIG. 4 is an electric circuit diagram, and FIG. 5 is a schematic diagram of the gas valve section.

In the figure, reference numeral 10 denotes a combustion tube which is the main body of the pipe burner, and an external electrode made of a thermocouple material such as chromel, Inconel, or heat-resistant mesh.

A crater 11 is provided above the combustion tube 10, and above the crater 11 there is a head plate 12 which is a flame holding part integrally formed with the combustion tube 10 with an appropriate gap.

At the center of the headboard 12 is a polar wire 13 covered with the headboard 12.
This is an internal electrode made of a thermocouple material such as Constance or Alumel.

The tip A portion where the head plate 12 and the polar wire 13 are welded together is the heat sensitive portion of the thermocouple and serves as a thermal contact portion.

The other end of the combustion tube 10 is connected to a gas conduit 14 by screwing with a fixed body 15 and connected to a starter safety device 19 via the vessel body.

16 is a nozzle, and 17 is an air port bored in the combustion tube.

On the other hand, a conductive wire 18 is connected to one end of the pole wire 13 at an arbitrary position and led to a spark safety device 19 to form an electric circuit as shown in FIG.

Part B of each connection point is a cold contact part.

Also, in FIG. 5, 20 is an electromagnet, 21 is a gas valve, and 22 is an electromagnet.
is the gas line.

To explain the operation in the above structure, the nozzle 16
When more gas is supplied and ignited, a flame is formed at the crater 11, and the hot junction A at the center of the tip of the head plate 12 is heated by the flame, so the temperature rises quickly, while the temperature at the cold junction B increases. One end is the threaded part between the combustion tube 10 and the fixed body 15, so it is cooled by the incoming gas and suction air, and the other end of the cold junction B, the joint between the polar wire 13 and the conducting wire 18, is similarly affected by the combustion flame. By locating it in a place where it is not exposed to heat, it is possible to achieve a low temperature and quickly obtain a wide temperature difference.

Therefore, the electromotive force generated by the temperature difference between the hot junction and the cold junction excites the gas valve 21 of the large convex safety device 19 using the electromagnet 20 to open the gas path 22.

In this way, since the pie tip burner itself is a thermocouple, it is possible to reduce variations in response due to flame conditions and positional changes of the thermocouple, as in the conventional case, and to achieve speed.

Also, if the flame disappears from the crater 11, the ejected gas will close the hot junction A.
The response speed for opening the gas valve 21 of the spark safety device 19 is extremely fast, without the slow temperature drop due to the effect of the thermocouple mounting member, which becomes hot during combustion and has a large heat capacity, as in the conventional structure. It gets faster.

Even when used in a windy environment, the vent 11 and the hot contact point A are covered with flame, so even if the flame fluctuates, there is no concern that the gas valve 21 will not be able to open and hold due to insufficient electromotive force, and there will be no malfunction. There will be none.

Furthermore, when this pipe burner is adopted as an oxygen deficiency prevention safety device, there is no thermocouple in front of the pipe burner that would be an obstacle for the flame in the crater 11 to lift or blow off when the oxygen concentration decreases. The flame will easily fly away and be extinguished, and the hot junction A will be rapidly cooled by the above-mentioned ejected gas and the flame safety device will be activated. In order to close the gas valve 21 of No. 19, the gas path 22 is shut off, and leakage of raw gas is quickly prevented, which can be expected to be effective in preventing unexpected accidents such as poisoning.

Furthermore, since the pilot burner itself forms a thermocouple, there is no need for a thermocouple or a mounting member that was conventionally required, so the workability is good and the cost is low.

As described above, the present invention provides a spark safety device with quick and reliable response, and is an inexpensive and highly effective device with good assembly workability.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of a conventional example, FIG. 2 is a perspective view of the present invention, FIG. 3 is a side sectional view of the present invention, and FIG. 4 is an electric circuit diagram of the present invention. FIG. 5 is a schematic diagram of the gas valve section of the present invention. 10... Combustion tube, 11... Crater, 12
...Headboard, 13...Polar line, 14...
...Gas conduit, 15...Fixed body, 16...
...Nozzle, 11...Air port, 18...
・・Conductor, 19・・・・Fire safety device, 20・・・・
...Electromagnet, 21...Gas valve, 22...
・Gas path, part A...Thermal contact, part B...
cold junction.

Claims (1)

[Claims] 1. A piston burner for a thermoelectric spark safety device, characterized in that the piston burner itself is a thermocouple.