JPH06123372A - Urgent interrupting device of gas at time of fire - Google Patents

Abstract

PURPOSE:To allow the effective operation at time of fire without maintenance by integrating an urgent cutoff valve in a gasket passage within a device body, and integrating a safety mechanism for fixing the cutoff valve at ordinary temperature, releasing it by the heat of a fixed temperature or more, and closely adhering it to a valve seat to interrupt gas flow. CONSTITUTION:A device body 1 is formed of a gas passage 2; a valve seat 3; an urgent cutoff valve 4 integrated in the gas passage 2; a holder 5 for holding the urgent cutoff valve 4 by a guide cylinder 5a in such a manner as to be capable of vertically sliding; a mounting screw 5b for the holder 5; and a spring 6 for pushing out the urgent cutoff valve 4 to the seat 3 side. The urgent cutoff valve 4 is fixed to the holder 5 by a solder 7, and when it receives a heat by fire, the solder 7 is dissolved, and the valve 4 is pushed out by the spring 6 and closely adhered to the valve seat 3 to interrupt the gas flow. Thus, a secondary fire based on the gas can be prevented, and a maintenance-free device can be provided at low cost by utilizing solder, shape memory alloy, bimetal, and plastics.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for urgently shutting off gas when a fire occurs.

2. Description of the Related Art A safety device is known in which an emergency shutoff valve is closed by an input from a sensor when a fire, an earthquake or the like occurs.

However, since the above-mentioned safety device requires a power source, a sensor, a control circuit, etc., the facility is expensive and periodic maintenance is required.

An object of the present invention is to provide an emergency gas shutoff device in case of a fire which can be installed at a low cost, is maintenance-free, and operates effectively in a fire.

The structure of the gas emergency shutoff device during a fire according to the present invention is as follows.

An emergency shutoff valve is installed in the gas flow passage in the main body of the apparatus, and the emergency shutoff valve is fixed at room temperature and released when heat of a certain temperature or higher is applied to bring it into close contact with the valve seat to allow gas flow. A gas emergency shutoff device in the event of a fire that incorporates a safety mechanism to shut it off.

The emergency shutoff valve may be fixed in the gas flow passage with solder, and the emergency shutoff valve may be released when the solder melts. Alternatively, the emergency shutoff valve may be fixed in the gas flow passage with a shape memory alloy. When a certain amount of heat is applied, the shape memory alloy may be used to release the heat. Alternatively, a bimetal may be used to fix the gas flow path, and when a certain amount of heat is applied, the bimetal may open the emergency shutoff valve.

The emergency shutoff device according to the present invention is attached to the middle or end of the pipe. At room temperature, the safety mechanism fixes (holds) the emergency shutoff valve, which does not hinder the gas flow. On the other hand, when a fire occurs and heat of a certain temperature or higher is applied to the device, the solder as a safety mechanism is melted, the shape memory alloy is activated, or the bimetal is displaced to release the emergency shutoff valve. The emergency shutoff valve moves to the valve seat by its own weight or the force of the spring and sticks to it. As a result, the gas is shut off and a secondary fire caused by the gas is prevented from occurring during a fire.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, 1 is an apparatus main body, 2 is a gas passage, 3 is a valve seat, 4 is an emergency shutoff valve incorporated in the gas passage 2, 5 is the emergency shutoff valve 5, and a guide cylinder 5a. The holder 5 slidably held up and down by 5b is a mounting screw portion of the holder 5, 6 is a spring for pushing the emergency shutoff valve 4 to the valve seat 3 side, 7 is solder, and the emergency shutoff valve 4 is It is attached to the holder 5 with this solder 7, and when it receives heat during a fire, this solder 7 melts and is pushed out by the spring 6 as shown in FIG. Cut off. FIG. 3 shows an emergency shutoff valve 4, a holder 5, a spring 6 as a safety mechanism.
FIG.

FIG. 4 shows a safety device having an inverted L-shaped gas passage 2 in which gas flows in the direction of arrow a, and the emergency shutoff valve 4 is fixed by solder 7 as in the above embodiment. When receiving heat, the solder 7 melts and comes into close contact with the valve seat 3 as shown in FIG. 5 to shut off the gas flow. FIG. 6 is an exploded view of the holder 5, the spring 6, and the emergency shutoff valve 4, and FIG.
A method for attaching this to the attachment portion 1a in the apparatus main body 1 will be described. The gas passage 2 is inserted from the outlet side and fixed with the screw of the attachment portion 1a.

FIG. 8 shows an example in which the holder 5 and the emergency cutoff valve 4 are fixed with a screw 8 made of solder, and FIG. 9 shows an example fixed with a pin 9 made of solder. 4 can be released.

In the above embodiment, when heat of fire is applied to the apparatus body 1, the solder 7 melts under the influence of this heat. When the solder 7 is melted, the emergency shutoff valve 4 is pushed out to the valve seat 3 side by the force of the spring 6 and is brought into close contact therewith to shut off the gas flow.

The reason why the solder 7 is used in the above embodiment is that the melting temperature of the solder 7 is low, there is no change in performance over time, it is inexpensive, and it is easy to process. . However, in addition to this, shape memory alloys or bimetals can be considered as those having advantages similar to the solder 7, and these members can be put to practical use. In this case, the shape memory alloy can be used also as the spring 7, and the bimetal releases the fixation (engagement) of the emergency shutoff valve 4 by this displacement. In addition, low melting temperature plastics and the like can also be used.

As described above, according to the present invention, the emergency shutoff valve operates to shut off gas in the event of a fire as described above. Therefore, it is possible to prevent a secondary fire due to the gas, and also solder, shape memory alloy, bimetal, plastic, etc. By using, it is cheap and maintenance-free. Therefore, the shutoff device according to the present invention is effective as a safety measure by being installed at the main valve of the room or a part of the gas pipe, and is also effective as a supplement to a known emergency shutoff valve of a fire sensor drive type. Is.

[Brief description of drawings]

FIG. 1 is a sectional view of an emergency shutoff device according to the present invention.

FIG. 2 is an explanatory view of a state in which an emergency cutoff valve is activated.

FIG. 3 is an exploded view of a safety mechanism.

FIG. 4 is a sectional view of an emergency shutoff device having an inverted L-shaped gas passage.

5 is an explanatory view of a state in which an emergency cutoff valve is activated in the apparatus of FIG.

FIG. 6 is an exploded view of the safety mechanism.

FIG. 7 is an explanatory diagram of an example of assembling the safety mechanism.

FIG. 8 is an explanatory view of a state in which the emergency shutoff valve is fixed by using a screw made of solder.

FIG. 9 is an explanatory view of an example in which an emergency shutoff valve is fixed by using a solder pin.

[Explanation of symbols]

 1 Device Main Body 2 Gas Flow Path 3 Valve Seat 4 Emergency Shutoff Valve 5 Holder 6 Spring 7 Solder

Claims (4)

[Claims] 1. An emergency shutoff valve is incorporated in a gas flow path in the main body of the apparatus, the emergency shutoff valve is fixed at room temperature, and is released when heat of a certain temperature or higher is applied to bring the gas into close contact with a valve seat. A gas emergency shutoff device in the event of a fire that incorporates a safety mechanism to shut off the flow. 2. The emergency shutoff device for a gas during a fire according to claim 1, wherein the emergency shutoff valve is fixed in the gas flow path with solder, and the emergency shutoff valve is released when the solder is melted. 3. The fire shutoff valve according to claim 1, wherein the emergency shutoff valve is fixed in the gas flow passage with a shape memory alloy, and when a certain amount of heat is applied, the emergency shutoff valve is released by the action of the shape memory alloy. Gas emergency shutoff device. 4. The fire shutoff valve according to claim 1, wherein the emergency shutoff valve is fixed in the gas flow passage with a bimetal, and the bifurcated bimetal releases the emergency shutoff valve when a certain amount of heat is applied. Gas emergency shutoff device.