JPS5941707A - gas supply port - Google Patents

Abstract

PURPOSE:To make the deformation of a shape memory alloy in case of increased temperature thereof and to close a gas flow passage, stop a feeding of gas and improve a safety of the gas feeding pipe by a method wherein a stop valve made of the shape memory alloy is arranged at the end part of the gas feeding pipe. CONSTITUTION:At a gas feeding port, a stop valve 3 is arranged between a cock 1 and a nozzle 2, and the stop valve 3 is constituted by the pipe 4 made of a shape memory alloy with a reduced diameter under a deformation of shape in an increased temperature, one end closed pipe 6 having a gas flow port as a side hole 5 and a metallic outer shell 7. When the gas feeding port is heated and its temperature is increased due to a combustion of rubber gas hose caused by a back-fire at a gas instrument or inflaming of leaked gas caused by a deterioration of the rubber gas hose, the pipr 4 made of the shape memory alloy is reduced in its diameter, and in turn the stop valve 6 is closed to close the side hole 5, the gas flow passage is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a gas supply port for city gas, liquefied propane gas, etc.

Conventional Structure and Problems The conventional gas supply port has a structure in which a nozzle portion having a cock is provided at the end portion of a metal pipe. Generally, a gas user connects a gas appliance to this nozzle using a rubber gas hose, and then opens the cock to combust and use the gas.

While the cock is open, gas can flow out from the nozzle, so even if the rubber gas hose burns due to a backfire from a gas appliance, or if gas leaks and ignites due to deterioration of the rubber gas hose, the gas will still flow out. continues to flow out,
There was a risk of igniting nearby household goods, houses, etc. and causing a fire. In addition, as a preventive measure against these problems, safety devices are used that install gas detectors and fire detectors to close and operate the gas cutoff solenoid valve, but these do not close in the event of a power outage or current consumption, and are not fail-safe. It was inappropriate as a required gas leak safety device. On the other hand, there are also types that run a current through the solenoid valve to keep it open all the time, but these require constant electricity, and if a battery is used to open the solenoid valve, it consumes a lot of energy, so it is not suitable for commercial use. When using a power supply, there is a risk of erroneous closing due to a power outage, and it is not always satisfactory.
In addition, these devices are not preferred as gas supply ports because they require a lot of work and take up a lot of space to install, and they also require high equipment and operating costs, making them uneconomical.

Furthermore, there is a risk that the electromagnetic valve may lose its function due to burnout and gas leakage may occur again, so this method could not be said to be sufficient.

OBJECTS OF THE INVENTION The present invention aims to eliminate the drawbacks of the prior art as described above and to provide a compact, reliable, and economical gas supply port structure.

Structure of the Invention The structure of the present invention is a gas supply port structure in which a shutoff valve using a shape memory alloy that undergoes memory deformation when the temperature rises is provided at the end of a non-combustible gas supply pipe such as a metal ceramic or in the vicinity of the pipe side. be.

The effect of the present invention is that when a gas user uses a rubber gas hose to connect a gas appliance to the gas supply port of the present invention and opens the gas cock to burn the gas, in the unlikely event that the gas appliance backfires or the rubber If the rubber hose burns due to gas leakage or ignition due to deterioration of the rubber hose, if the burning end approaches or reaches the gas supply port, the heat of combustion will cause the shape to memorize and deform when the temperature rises. The memory alloy undergoes memory deformation to block the gas flow path and stop the gas supply, thereby stopping gas combustion and preventing the occurrence and spread of a fire.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be explained with reference to FIG. 1. The gas supply port of this embodiment is provided with a shut-off valve section 3 between a cock 1 and a nozzle 2, and the shut-off valve section 3 is capable of memory deformation when the temperature rises. It consists of a pipe 4 made of a shape memory alloy that reduces the pipe diameter, a one-end closed pipe 6 having a gas flow opening as a side hole 5, and a metal outer shell. When cock 1 is open,
Gas flows from the main valve side 8 through the side hole 5 of the vibro with one end closed, from the pipe 4 made of shape memory alloy to the nozzle 2, and is supplied to the gas appliance via a rubber hose connected to the nozzle. Under normal conditions, the pipe 4 made of shape memory alloy does not contract, so this gas flow path remains formed, but in the unlikely event that gas leaks due to a backfire from a gas appliance or deterioration of a rubber gas hose. When the gas supply port is heated and the temperature rises due to combustion of the rubber gas hose due to ignition, etc., the pipe 4 made of shape memory alloy contracts to reduce its diameter. By closing the side hole 5, it functions to completely block the gas flow path. The shape memory alloy for pipe 4 is temporarily assembled by expanding and deforming the small-diameter pipe shape at a low temperature, which is memorized at a high temperature, and is then re-heated to a high temperature, and according to the memory at the high temperature of light removal, the shape memory alloy is memorized and deformed, and the diameter is reduced again. It uses a type of shape memory alloy that retains its shape even if it returns to a low temperature unless external force is applied.
The gas flow path once blocked will not be opened due to gas pressure, and the blocked state can be maintained until the user operates the cock 1 after closing it.

In implementing the present invention, it is an effective implementation method to install it on the main valve side in the gas meter, and it is not a trap that it can function as a gas circuit breaker for each house in the event of a fire, especially in apartment complexes etc. .

As another example, as shown in FIG. 2, a soft metal conical plug 9 is connected to a metal outer shell by a spring 8 made of a shape memory alloy whose spring length is shortened due to memory deformation when the temperature rises. It is also possible to press the taper hole 1o to block the gas flow path.

Effects of the Invention According to the present invention having the above-described structure, there is no need for any power supply during operation or normal operation, and operating parts can be made from small parts made by deforming ear shape memory alloy at room temperature. In addition to being able to miniaturize the shutoff valve part, the operational reliability of the parts is high because it directly utilizes the physical property of shape memory, and fail-safe properties can also be achieved by utilizing the unidirectional shape change characteristics of shape memory alloys. Since the sensor and actuator mechanism has a simplified configuration, it is possible to provide an economical and compact gas supply port that is easy to assemble.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views showing embodiments of the present invention. 4... Shape memory alloy pipe, 5...
Side hole, 6... - Endless closing pipe, 7...
...Metal shell, 8...Shape memory alloy spring, 9...Soft metal conical plug, 1o...
...Tapered hole.

Claims (1)

[Claims] A gas supply port provided with a gas shutoff valve made of a shape memory alloy that undergoes memory deformation when the temperature rises at the end of a nonflammable gas supply pipe or near the pipe side.