JPS5830496B2 - Gas automatic shutoff device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device in a gas appliance that senses the temperature and automatically shuts off the gas passage when the flame is extinguished due to wind or boiling over.

Conventionally, a thermosensor was used to detect temperature or a phototube was used to detect ultraviolet light, and a complicated electronic circuit was used to shut off the gas passage using a solenoid valve. There were negative effects that made it difficult to spread at home.

An object of the present invention is to provide an inexpensive device that uses mechanical components and is free from secondary disasters.

That is, a valve made of a magnetic material connected to a push button is always biased in the direction of closing the gas passage, and a permanent magnet is installed opposite the valve in the open position of the valve via a thermoferrite, and the above-mentioned A second valve is provided in the gas passage in parallel to the above-mentioned valve, and this valve is connected to a member that deforms or displaces when the temperature rises to open and close the valve, and further ignites the gas appliance. The present invention is characterized in that a heat conductor is provided which transmits the heat of the flame generated by the above-mentioned member and thermoferrite.

Next, an explanation will be given based on an embodiment of the present invention shown in the drawings.

1 is a vessel body, a valve 3 fixed to a rod 2 is a seat 4
A push button 5 is fixed above the rod 2, and a spring 6 is interposed between the push button 5 and the upper surface of the container body 1.
is constantly pressed against sheet 4.

A thermoferrite 7 and a permanent magnet 8 are fixed in close contact with each other below the bulb 3.

Further, a second bulb 9 is connected to one end of the memory alloy 10 in the container body 1, and the other end is connected to a heat conductor 11.

The bottom surface of the permanent magnet 8 is also in contact with the thermal conductor 11 .

Gas enters through a pipe 13, passes through a passage 14, passes through a passage 15 and a conduit 17, and is supplied to the gas appliance.

It is also supplied from the passage 16 through the conduit 17.

Figure 2 shows bellows 1 filled with gas instead of memory alloy.
This is another example using 8.

One end of the bellows 18 is fixed to the heat conductor 11, and the other end is fixed to a rod 19 with a valve 9. Normally, the bellows 18 is contracted and the valve 9 and the seat 12 close the passage 16. There is.

FIG. 3 shows another embodiment in which a bimetal is used instead of the memory alloy shown in FIG. Pin 2 fixed to valve 9 at the tip of bimetal 21
2 are rotatably connected, and normally the bimetal 21 is deflected in the direction of the seat 12 and closes the passage 16 by the valve 9 and the seat 12.

Note that the tip of the heat conductor 11 is placed near the burner of the gas appliance.

Further, the push button 5 may be linked to the operation of a cock of a gas appliance.

A memory alloy is generally an alloy of Ni and Ti. A wire or plate made of the memory alloy is formed into the shape shown by the broken line in Figure 1, and then it is annealed (7) to form a wire or plate. remembers its shape.

When this wire is cooled, it becomes free to deform, but when the temperature is raised, it returns to its original shape.

In the embodiment shown in FIG. 1, the operating temperature of the thermoferrite 7 and the memory alloy 10 is determined to be lower for the memory alloy 10, and when the push button 5 is pressed, the valve 3 moves downward and the thermoferrite 7 The valve 3 and the seat 4 continue to be opened against the force of the spring 6 even after being sucked and the hand is released.

Then, the gas is transferred from the pipe 13 to the pipe 14, the pipe 15, and the pipe 1.
7 and is supplied to gas appliances.

When the burner of the gas appliance is ignited, the heat of the flame is transmitted from the tip of the heat conductor 11 and heats the memory alloy 10, thermoferrite 7, and permanent magnet 8.

When the temperature rises, the memory alloy 10 first remembers its original shape and becomes as shown by the broken line, and the second valve 9 and seat 12
gas is also supplied from the gas passage 16.

As the temperature rises further, the thermoferrite 7 reaches the Curie point temperature, becomes a non-magnetic material, and the magnetic force of the magnet 8 is transferred to the valve 3.
It will fall short of .

The valve 3 therefore moves upwards due to the elasticity of the spring 6 and closes the passage 15.

However, since the passage 16 is already open at this time, gas can be continuously supplied.

When the flame of the gas burner is extinguished, the heat conductor 11 dissipates the accumulated heat and is cooled down.Contrary to the above, the temperature of the thermoferrite 7 falls below the Curie point, and the lines of magnetic force pass through it. At this time, the valve 3 is already pushed upward, so it will not open.

When the temperature further decreases, the memory alloy 10 returns to the solid line shape shown in the figure, closing the passage 16 and cutting off the gas.

In the embodiment of FIG. 2, when the temperature rises, the gas sealed in the bellows 18 expands, causing the second valve 9 and the seat 12 to expand.
are separated to open the passage 16, and in case of extinguishing the fire, the bellows 1
The gas in 8 cools and presses the second valve 9 against the seat 12.

Also, in the embodiment of FIG. 3, when the temperature increases, the bimetal 21 bends in the opposite direction to the second valve 9, and the passage 1
6 is opened to extinguish the fire, the bimetal 21 is displaced as shown in the figure to close the passage.

According to this invention, when the push button is pressed to open the valve 3, the open state can be maintained as it is, and the second valve is automatically opened by igniting the burner of the gas appliance, and then the second valve is opened. Since the valves close, even if the valves are installed in parallel, there is no problem with ignition, and automatic shutoff due to extinguishment is reliably performed by the second valve with a simple structure using mechanical parts, so it is inexpensive. Yes, due to electrical leakage etc. 2
No further disasters will occur.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing another embodiment using bellows in place of the memory alloy shown in FIG. 1, and FIG. FIG. 7 is a longitudinal cross-sectional view showing another embodiment in which a bimetal is used instead of a memory alloy. 3...Valve, 7...Thermoferrite, 8...Permanent magnet, 9...Second valve, 10...Memory alloy , 11... thermal conductor, 18... bellows, 21...
bimetal.

Claims (1)

[Scope of Claims] 1. A valve connected to a push button and connected to a magnetic body is always biased in the direction of closing the gas passage, and a permanent magnet and a thermoferrite are placed opposite the valve in the open position of the valve. A second valve is installed in the gas passage in parallel with the valve, and the second valve is connected to a member that deforms or displaces when the temperature rises to open and close the valve. An automatic gas shutoff device characterized by being provided with a heat conductor that transmits the heat of the flame generated when a gas appliance is ignited to the above-mentioned member and thermoferrite. 2. The automatic gas shutoff device according to claim 1, wherein the member for operating the second valve is a memory alloy 10 that remembers its original shape when the temperature rises. 3. The automatic gas shutoff device according to claim 1, wherein the member for actuating the second valve is a bellows 18 sealed with a gas body. 4. The automatic gas shutoff device according to claim 1, wherein the member for operating the second valve is a bimetal 21.