JPS6066017A - Gas shut-off valve for gas burner - Google Patents

Abstract

PURPOSE:To shut off the supply of gas in an earthquake by extermely simple structure by forming a ferromagnetic material hung to a coil spring in structure in which the ferromagnetic material is sucked to a valve seat as a permanent magnet by vibration. CONSTITUTION:A valve body 2 consisting of a ferromagnetic material having inertial mass is fixed into a valve proper 1 composed of a nonmagnetic material by one end section of a coil spring 3 while the other end section of the coil spring 3 is fastened to a detachable rod 4, and fixed at a stationary position by a stud 6 releasable to a valve cover 5. The valve body 2 is disposed simultaneously where the sucking force of a valve seat 7 as a permanent magnet can be ignored, and a communication port 7' is closed by the sucking force of the valve seat 7 on a relative vibration in the case of an earthquake. The vertical vibration of the earthquake is detected, and the coil spring 3 is shrunk and extended repeatedly, moved simply harmonically and displaced, but the valve body 2 is sucked by sucking force by the magnetic force of the valve seat 7 on the extension, and the communication port 7' is closed and the supply of gas is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to gas combustion appliances such as gas stoves and gas bathtubs, and relates to a gas cutoff valve that stops the supply of gas when ground vibrations exceeding a predetermined level are generated.

Conventionally, this type of gas shutoff valve detects ground vibration using a geothermometer, converts it electrically, and closes a solenoid valve installed in the gas pipeline. However, geothermometers, transducers,
It required multiple pieces of equipment, such as solenoid valves, and was complicated and expensive.

The present invention was devised in view of these drawbacks, and aims to improve the safety of gas combustion appliances by automatically stopping the gas supply when noise vibrations exceed a predetermined level, thereby preventing secondary disasters such as fires. With the goal.

A detailed explanation will be given below based on examples.

Earth vibrations are known as displacement vibrations, acceleration vibrations, and velocity vibrations. Each is used as a vibration meter, and when the ratio of the frequency of ground vibration to the natural frequency of the vibrator is approximately 2 or more, the displacement vibration is
It is utilized that when the acceleration vibration is set below the limit, the acceleration vibration vibrates relative to each other with the amplitude magnification of the stabilized vibration at each frequency being approximately 1.

There are many methods known to have the above-mentioned natural frequency, such as a spring oscillator in which an inertial mass is fixed or supported on a coil spring, a plate spring, a long rubber, etc., and a simple oscillator in which an inertial mass is suspended from a thin thread. It is being

The present invention is an advanced application of the above-mentioned principle to a gas shutoff valve. Figure 1 shows a cross-sectional view of a gas shutoff valve that detects vertical ground vibration, and Figure 2 shows horizontal ground vibration. Figures 1 and 2 show cross-sectional views of a gas shutoff valve that detects gas for a non-magnetic valve body (hereinafter simply referred to as the valve body). (hereinafter simply referred to as the valve body) 2 is fixed to one end of a coil spring 3, while the other end of the coil spring 3 is fixed to a detachable rod 4, and is fixed in a normal position by a releasable stopper 6 to the valve cover 5. Ru. At the same time, the valve body 2 is located at a position where the adsorption force of the valve seat (hereinafter simply referred to as the valve seat) 7, which is a permanent magnet, can be ignored. etc., and the gas inlet a communicates with the communicating lower 11 of the valve seat 7 and the gas outlet, and the pressure of the combustion gas causes the point G to
One end of the rotating shaft 8.9 at a position further apart is passed through the gas inlet passage c1 and the gas outlet passage d, and is supported by the protrusion g I+ on the 0 end of the rotating shaft 9, and the valve body 1 is rotatably mounted on a shaft. The other end of the rotating shaft 8.9 is fixed to a gas combustion appliance frame or a building (both not shown) by a support frame 10, and the gas flows through the gas inflow loa a1 gas inflow path C and e1 communication lower' and the gas outflow The passages d and f1 are in communication with the gas outlet, and as in FIG. 1, gas is supplied by the pressure of the combustion gas.

The operation will be explained below.

In Fig. 1, the vertical vibration of the ground vibration is detected, and in Fig. 2, the horizontal vibration of the ground vibration is detected. When the valve body 2 is extended, the valve body 2 is attracted by the magnetic attraction force of the valve seat 7, and the communication lower 1 is closed and the gas supply is stopped.The state of the attracted valve body 2 is shown in Figs. The displacement of the coil spring 3 is shown by the dotted line in Fig. 2.It is omitted from the illustration because the displacement of the coil spring 3 is self-evident.Furthermore, the valve element 2 which is supported and adsorbed becomes one with the valve seat 7, and no longer functions as a vibrator. It will not be easily detached due to ground vibration after adsorption.Furthermore, in Fig. 2, when the ground vibration and the detection direction of the valve body 2 do not match, the valve body 10
The inertial force generated at the center of gravity G acts on the rotating shaft 8.9 as a rotational force, so that the detection direction always matches the ground vibration. Next, in the case of restoring the valve body 2 that has been completely attracted in both FIGS. By applying a source force, the valve body 2 is attached and detached from the valve seat 7, and after attachment and detachment, the detachment rod 4 is gently returned to the initial position with the stopper 6.
The device is fixed in a steady position and resupplied with gas.

The gas cutoff valve of the present invention does not detect either displacement vibration or acceleration vibration, and the coil spring 3 is connected to the ferromagnetic valve body 2, which is an inertial mass. As described in , select either a sufficiently soft spring that satisfies the above ratio and detects displacement vibration, or a sufficiently stiff spring that satisfies the above ratio and detects acceleration vibration. It is up to you to decide. Further, in this embodiment, the valve body 2 is made of a ferromagnetic material, which is an inertial mass, and the valve seat 7 is made of a permanent magnet. The effect is the same even if the valve seat is made like this, and even if both of them are attracted as permanent magnets, the effect is the same.

[Brief explanation of the drawing]

The drawings schematically show an embodiment of the present invention, and FIG. 1 is a cross-sectional view of a gas shutoff valve that detects vertical ground vibrations, and FIG. 2 shows a cross-sectional view of a gas shutoff valve that detects horizontal ground vibrations. A cross-sectional view of the shutoff valve is shown. 1... Valve body 2 made of non-magnetic material ・ Valve body 3 made of ferromagnetic material which is inertial mass ・ Coil spring 4 .. Detachable rod 5 .. Valve cover 6 .. Stop 7 . ,91...Communication port 8,9.Rotation axis gl+...
Projection 10...Support frame a...Gas inlet b...Gas outlet C, e: Gas inlet path d, f...Gas outlet path G...Center of gravity of valve body 1 For patent applicant Hideo Mura (4 others)

Claims (1)

[Claims] 1. A valve body having an inertial mass is fixed or supported by an elastic coil spring or the like, and has a predetermined natural frequency, and either the valve body or the valve seat is made of a ferromagnetic material. , the other one is made a permanent magnet, or both are made permanent magnets, and the valve body and the valve seat are attracted to each other when the valve body and the valve seat vibrate relative to each other when the vibration exceeds a predetermined value,
A gas shutoff valve characterized by closing a gas communication port. 2. The rotating shaft is installed at a position far away from the center of gravity of the valve body, and the rotational force of the valve body is used to constantly match the direction of the horizontal vibration of the ground vibration during noise vibrations. A gas shutoff valve according to claim 1.