JPS6159419B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas stopper that closes a gas flow path during an earthquake or a gas leak.

Conventional gas stoppers that use magnetic force operate a gas valve that opens and closes the gas flow path inside the gas flow path using the magnetic force of a magnetic plate that approaches the valve outside the gas flow path to block the gas. There are many things. In these devices, when an earthquake occurs and the gas flow path is to be blocked, the magnetic plate uses magnetic force to pull the gas valve toward the gas valve, but if the magnetic plate shakes during an earthquake and the direction of the magnetic field changes. There is a defect that reduces the attracting magnetic force. Therefore, in this invention, the gas valve is always pulled close to the gas flow path by a magnetic plate, and the gas flow path is kept open, and the direction of the magnetic field is changed by the singing movement of the magnetic force plate due to an earthquake, thereby releasing the gas valve and closing the gas flow path. That is. Furthermore, when a separate gas leak occurs, another electromagnet is energized by an electric signal from a gas leak detector to open the valve and close the gas flow path.

In order to achieve the above object, the present invention provides a magnetic valve a that opens and closes a gas flow path in a sealed case that communicates with a gas inflow side and a gas outflow side and prevents gas leakage. A magnetic disk (b) is housed so as to be slidable vertically within the airtight case, is supported vertically above the closed case, and is equipped with a swingable weight. An electromagnet is provided below the sealed case, facing the magnet on the lower surface of the magnet valve a.

To explain the details using an example, a sealed case 1 forming a gas flow path has a recess 2 with a large diameter that communicates with the gas inflow side from the top surface, and a recess 2 with a large diameter between the gas outflow side and the recess 2 below. A recess 3 with a small diameter is dug in communication with the upper recess 2, and a cover plate 4 is hermetically closed to the upper recess 2 and fixed with screws. Magnet valve a is recessed part 2
Inside, a large-diameter bottom plate 5 that can freely move up and down is provided, and an abutment plate 8 provided with a magnet 7 is integrated at the center of the upper surface of a small-diameter upper plate 6 that is integrally provided on the upper surface of the bottom plate 5. An abutment plate 16 is integrally provided on the lower surface of the bottom plate 5 and is inserted into the recess 3 so as to be able to freely move up and down.
There are 7. A spring 9 is provided between the upper peripheral edge of the bottom plate 5 formed by the difference in diameter between the bottom plate 5 and the top plate 6 and the lid plate 4. The magnetic disk b, which is suspended in a case 10 fitted on the sealed case 1, has a magnet 12 at the bottom of the weight 11, and a shaft rod 13 attached to the top of the weight 11, which is inserted into the hole 14 of the case with a spring 15. I am keeping it. An electromagnet 19 is provided in a lower case 18 below the sealed case 1, facing the magnet 17 on the lower surface of the bottom plate 5.

In the above configuration, the magnetic force between the magnet valve a and the magnet disc b is such that the magnet valve a is lifted up against the spring 9 to the extent that the magnet disc b comes into contact with the cover disc 4 by pushing down the shaft rod 13, and the shaft The magnet disk b is lifted by the spring 15 of the rod 13 and returns to its original height. At this time, the magnets 7 and 12 of the magnet valve a and the magnet disc b
When the magnet valves a are at opposing positions on the vertical line, the lifting of the magnet valve a is maintained, and when the magnet disc b is not located on the vertical line with the magnets 12 and 7 due to the swinging of the weight 11, the return elasticity of the spring 9 is The magnetic force is selected so that the weight of the magnetic valve a causes the valve a to fall. The bottom plate 5 is movable in the large recess 2 so that the gas pressure is applied to the upper and lower surfaces of the magnet valve a at the same level during gas flow. When seated, the valve is quickly kept closed by the gas pressure on the inflow side and the weight of the magnet valve a. Note that gas circulation grooves may be provided on the side surface of the recess 2 or the bottom plate 5. Although the shaft rod 13 is shown protruding from the case 10, it may be covered with a cap to prevent the magnet 12 from shaking due to contact with other objects. Next, the electromagnet 19 is energized based on information from a gas leak detector (not shown).

According to the configuration of the present invention, under normal conditions, the magnet disk b pulls up the magnet valve a by magnetic force to open the gas flow path. At this time, since the magnet plate b and the magnet valve a are not bonded to each other with the lid plate 4 in between, they tend to separate due to a decrease in magnetic force. Then, the weight 11 swings due to the earthquake, and the direction of the magnetic field between the magnet 12 of the magnet disk b and the magnet 7 of the magnet valve a changes, and as the magnetic force decreases, the magnet valve a falls apart and closes the gas flow path. When there is a gas leak in the gas appliance during normal operation, the strong magnetic force of the electromagnet 19 pulls down the magnet valve a to close the gas flow path.

According to this invention, since it utilizes the decrease in magnetic force due to changes in the direction of the magnetic field between magnets, it has the effect of completely cutting off gas flow in response to changes in the magnetic field caused by earthquake vibrations, and gas leakage is prevented even during earthquakes. If it is detected, it has the effect of cutting off the gas flow as well.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical sectional view of the gas stopper of the present invention. In the figure, a is a magnet valve and b is a magnet disc. 1 is a sealed case, 2 and 3 are recesses, 4 is a lid plate, 5 is a bottom plate, 7 is a magnet, 10 is a case, 11 is a weight, 12 is a magnet, 1
7 is a magnet, 19 is an electromagnet.

Claims (1)

[Claims] 1. A magnet valve a that is loosely fitted in a gas flow path in a sealed case that communicates with the gas inflow and outflow sides so as to be able to move up and down.
is equipped with magnets on both the upper and lower sides, and the gas flow path can be closed off at the bottom, and the magnetic disc b, which is installed on the upper part of the sealed case so as to be able to swing up and down, has a magnet valve a on the bottom of its main weight. A magnet is provided opposite the magnet on the top surface, and an electromagnet connected to the operating circuit of the gas leak detector is provided at the bottom of the sealed case, facing the magnet on the bottom surface of the magnet valve a, to prevent gas leaks from gas appliances during earthquakes. A gas stopper that closes the gas flow path.