JPH0516466Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention is a gas combustor with a cylinder configured to reduce the pressure of liquefied fuel gas filled in the cylinder to a predetermined set pressure and supply it to the burner. This invention relates to a cylinder heating prevention device that cuts off fuel supply and stops combustion in a burner when the cylinder is overheated and abnormally pressurized due to the thermal influence of the flame.

<Prior art> Regarding this kind of technology, in the past, for example,
There is one disclosed in Publication No. 52-131286. It is connected to the regulator 4 as shown in Fig. 5 or 6.
A safety actuator 36 is attached to the pressure reducing valve 11, and the safety actuator 36 is connected to the primary passage 9 on the gas inflow side to the pressure reducing valve 11.
The valve body 1 of the pressure reducing valve 11 is activated by the abnormally increased pressure of
5 is configured to close the valve.

That is, in the one shown in FIG. 5, the Bourdon tube 31 with its open end facing the primary passage 9 is introduced into the valve chamber 12 of the pressure reducing valve 11, and the Bourdon tube 31 moves against the reversal plate 32 due to the abnormally increased pressure in the primary passage 9. The valve body 15 is configured to be operated in reverse, and the valve body 15 is operated to close via the operating rod 14 of the pressure reducing valve 11 by the reverse operation of the reversing plate 32.
This closed state is self-maintained by the reversing plate 32.

In addition, in the one shown in FIG. 6, a diaphragm cylinder type actuator 33 that operates due to abnormally increased pressure in the primary passage 9 is attached to the pressure reducing valve 11, and the output rod 34 of this actuator 33 is used to control the reversing plate 32 as described above.
It is configured to operate in reverse.

<Problems to be Solved by the Invention> Among the above conventional examples, the one shown in FIG. 5 uses a Bourdon tube as a safety actuator, so the output for reversing the reversing plate is weak. For this reason, a strong reversing plate cannot be used, making it difficult to obtain a strong valve closing force.

Moreover, since the one shown in FIG. 6 uses a diaphragm cylinder as a safety actuator, the structure becomes complicated and large.

The purpose of this invention is to close the valve with strong force, immediately prevent overheating of the cylinder, and to simplify and downsize the structure.

<Means for Solving the Problems> In order to achieve the above object, the present invention improves the conventional gas combustor as shown in FIGS. 1 to 3, for example.

That is, the safety actuator 16 is made of a shape memory alloy provided in the valve chamber 12 of the pressure reducing valve 11, and this shape memory alloy safety actuator 16 is activated when the gas temperature in the valve chamber 12 becomes abnormally high. Furthermore, the valve body 15 of the pressure reducing valve 11 is configured to be operated to restore the memorized shape due to the abnormally high temperature.

<Function> When the cylinder 3 is overheated due to the thermal influence of the flame of the burner 8, the liquefied fuel inside the cylinder 3 is also heated, and the internal pressure is abnormally increased by the vaporized high-temperature fuel gas, causing the pressure reducing valve 11 to rise.
The water is rapidly fed into the valve chamber 12 of the valve chamber 12. When the inside of the valve chamber 12 of the pressure reducing valve 11 reaches a predetermined abnormal high temperature,
The shape memory alloy safety actuator 16 restores its memorized shape and closes the valve body 15 of the pressure reducing valve 11 with its strong restoring force.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 4.

FIG. 4 is a plan view showing the outline of a gas stove which is an embodiment of the present invention. In this figure, the number 1
shows the entire gas stove, and this gas stove 1 has a liquefied fuel gas cylinder 3 inside the stove body 2,
The cylinder 3 is set in the connection port 5 of the regulator 4, the pressure of the liquefied fuel gas is reduced to a predetermined setting pressure by the regulator 4, and the gas flow rate control valve 6 and the gas supply pipe 7 are set.
It is configured to supply depressurized fuel gas to the burner 8 through the
When regulator 4 becomes abnormally heated,
A safety actuator 16 (described later) attached thereto is activated to stop the supply of fuel gas.

FIG. 1 is a cross-sectional plan view of the regulator 4, and FIG. 2 is a vertical cross-sectional view taken along the - line in FIG.

This regulator 4 includes a cylinder mounting part 10 for mounting the cylinder 3 into the cylinder mounting port 5, a pressure reducing valve 11,
It is equipped with a reversing plate 16a made of a shape memory alloy which is a safety actuator 16 provided in the valve chamber 12 of the pressure reducing valve 11, and a gas flow rate control valve 26 provided in the middle of a secondary passage 20 communicating with the burner 8. It consists of

The pressure reducing valve 11 is composed of a diaphragm cylinder type pressure reducing valve, and has internal pressure in the valve chamber 12 and a pressure setting spring 13.
The valve body 15 that forms a lever is actuated via the rod 14 by the pressure difference between be.

When the temperature of the fuel gas in the valve chamber 12 reaches a predetermined abnormally high temperature, the shape memory alloy reversing plate 16a restores its memorized shape due to an irreversible shape memory effect, and restores its shape as shown by the imaginary line. Reversing the shape and forcefully closing the valve body 15 via the rod 14,
It is configured to maintain that state by itself.
This immediately stops the supply of fuel gas and prevents the cylinder 3 from overheating.

Note that reference numeral 19 is a reset rod for returning the reversing plate 16a to the original state shown by the solid line.

FIG. 3 is a sectional view of a main part showing another embodiment of the safety actuator. This safety actuator 16 includes a pressing member 16c that operates to restore the memory shape due to a reversible shape memory effect when the inside of the valve chamber 12 reaches an abnormally high temperature;
An irreversible reversing plate 16b that is pressed by this pressing member 16c, reverses its shape as shown by the imaginary line, strongly closes the valve body 15 via the rod 14, and maintains this state by itself. It has substantially the same function as the reversing plate 16a described above.

<Effects of the invention> According to the invention, an abnormally high temperature inside the valve chamber is detected by a shape memory alloy safety actuator installed in the valve chamber of the pressure reducing valve, and the valve body is closed using the shape restoring force of the actuator. By doing so, a strong valve closing force can be obtained. Furthermore, since the shape memory alloy safety actuator can be made into a simple shape such as a plate or spring, the structure can be significantly simplified and downsized compared to conventional devices.

[Brief explanation of the drawing]

1 to 4 show an embodiment according to the present invention,
Fig. 1 is a cross-sectional plan view of the regulator, Fig. 2 is a vertical sectional view taken along the - line in Fig. 1, Fig. 3 is a sectional view of main parts showing another embodiment of the safety actuator, and Fig. 4 is a gas stove. The schematic plan view, FIG. 5, and FIG. 6 are cross-sectional plan views showing main parts of a conventional regulator, respectively. 1... Gas combustor (gas stove), 3... Cylinder, 4... Regulator, 8... Burner, 11...
...Pressure reducing valve, 12... Valve chamber, 15... Valve body, 16...
...safety actuator, 16a... reversing plate made of shape memory alloy, 16b... reversing plate, 16c... pressing member made of shape memory alloy.

Claims (1)

[Claims for Utility Model Registration] 1. A liquefied fuel gas cylinder 3 is set in the gas combustor 1, and the fuel gas vaporized from the liquefied fuel in the cylinder 3 is pressure-regulated by a regulator 4 and is supplied to a burner 8, A safety actuator 16 is attached to the pressure reducing valve 11 of the regulator 4, and when the cylinder 3 is overheated and abnormally rises due to the thermal influence of the flame of the burner 8, the safety actuator 16 detects this and the pressure reducing valve 11 is activated. In the regulator automatic cutoff device for a gas combustor equipped with a liquefied fuel gas cylinder when the cylinder overheats, the safety actuator 16 is constructed of a shape memory alloy provided in the valve chamber 12 of the pressure reducing valve 11. However, when the gas temperature in the valve chamber 12 becomes abnormally high, this shape memory alloy safety actuator 16 operates to restore its memory shape due to the abnormally high temperature, and the valve body 1 of the pressure reducing valve 11 is activated.
5. An automatic regulator shutoff device for a gas combustor equipped with a liquefied fuel gas cylinder when the cylinder is overheated, characterized in that the regulator is configured to close the cylinder. 2. Utility model registration in which the safety actuator 16 made of a shape memory alloy is comprised of a reversing plate 16a that performs an irreversible memorized shape restoring operation.Automatic regulator when the cylinder is overheated in a gas combustor with a liquefied fuel gas cylinder as set forth in claim 1. Shutoff device. 3. The shape memory alloy safety actuator 16 is composed of a pressing member 16c that performs a reversible memorized shape restoration operation and a reversing plate 16b, and this reversible shape memory alloy pressing member 16c and the valve body 15 of the pressure reducing valve 11 An automatic regulator shutoff device for a gas combustor equipped with a liquefied fuel gas cylinder when the cylinder is overheated according to claim 1, wherein a reversing plate 16b is interposed between the cylinders.