JP2501116Y2 - Gas safety valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention shuts off gas supply by closing a valve hole by moving a valve element provided in a gas supply path at a gas flow pressure of a certain level or more. More specifically, the present invention relates to a technology for improving the gas shutoff property while at the same time attempting to mount the gas safety valve in any direction without restricting the mounting direction.

[Prior Art] Conventionally, in this type of gas safety valve, as shown in FIG. 6, a valve body 2 is disposed in a main body pipe 1 of the valve so as to be movable in a gas flow direction, and A tapered contact surface 3 on the outer circumference of 2
Is provided, a tapered valve seat surface 5 is provided in the valve hole 4 of the main body pipe 1, a guide rod 6 is provided protruding from the valve body 2 in the moving direction of the valve body 2, and the guide rod 6 is slid into the guide hole 7. A spring 8 for freely inserting the valve body 2 is provided to keep the valve open state by separating the valve body 2 from the valve hole 4 unless a gas flow pressure above a certain level is applied to the valve body 2. In this gas safety valve, the valve body 2 is normally pushed by the spring 8 to the upstream side of the gas flow, and the valve body 2
The contact surface 3 and the valve seat surface 3 of the valve hole 4 are separated from each other, and gas flows from the upstream side to the downstream side as indicated by the arrow in FIG. 6 (a). When a gas leak or the like occurs on the downstream side of the gas safety valve, a large amount of gas flows and the valve body 2 causes the spring 8 to move.
The contact surface 3 of the valve element 2 is pressed against the valve seat surface 5 and the valve hole 4 is closed to prevent gas from flowing, thus ensuring safety.

[Problems to be solved by the invention] However, with such a structure, the valve body 2 is pushed by the flow of gas even at the initial stage of opening the gas plug, and the valve body 2 also closes the valve hole 4. Sometimes. In other words, a large amount of gas may momentarily flow in the initial stage of opening the gas plug, pushing the valve body 2 and closing the valve hole 4 with the valve body 2, which may cause a malfunction. In order to eliminate this, there is a type in which the valve body 2 does not operate due to the flow of gas in the initial stage of opening by the spring force of the spring 8, but in the case of this structure, the mounting direction of the gas safety valve must be fixed There was a problem. That is, there is a possibility that the load of the spring 8 is not applied or malfunctions depending on the mounting direction.

The present invention has been made in view of the above-mentioned points, and the object of the present invention is to ensure the safety by operating the valve element and closing the valve hole in the event of a gas leak or the like.
It is an object of the present invention to provide a gas safety valve in which the valve hole is not closed even if a large amount of gas instantaneously flows when the valve is opened.

[Means for Solving the Problems] In order to achieve the above object, in the gas safety valve of the present invention, the valve body 2 provided in the gas supply path is moved at a gas flow pressure of a certain level or more to close the valve hole 4. Then, when the gas supply is shut off and the valve body 2 receives only a flow pressure below a certain level, the valve body 2 is separated from the valve hole 4 by spring means to maintain the open state. 6 is projected toward at least the downstream side of the gas flow, and the guide rod 6 is slidably inserted into the guide hole 7 provided on the downstream side. When the valve body 2 moves so as to close the valve hole 4, the guide 6 is guided. An obstacle projection 9 is provided on the guide rod 6 so as to allow the guide rod 6 to slide in the hole 7 due to the obstacle.

[Operation] Normally, the valve body 2 is separated from the valve hole 4, and the gas flows through the valve hole 4. If a gas leak occurs on the downstream side of the gas flow, the flow rate of the gas increases, the valve body 2 is pushed by the gas, the valve body 2 closes the valve hole 4, and the gas flow is blocked. It In addition, a large amount of gas flows instantaneously at the beginning of opening,
Although the valve body 2 is pushed and moves in the direction in which the valve body 2 closes the valve hole 4, the guide rod 6 is damaged and slides with respect to the guide hole 7 so that the valve body 2 instantaneously opens the valve hole 4. Even if a large amount of gas instantaneously flows without closing, the valve body 2 does not malfunction by closing the valve hole 4.

[Embodiment] FIG. 1 shows a gas switch A such as a gas outlet, which can be a horizontal type to be embedded in a floor or a vertical type to be embedded in a wall. A closure hole (11) is bored in the central part of a tubular instrument body (10), and a closure (12) is rotatably attached. 13
Is an operation tool for the closure 12, and when the operation tool 13 is turned, the closure 12 is rotated in the closure hole 11 via the rotor 14, and the conduit is opened and closed by the conduction hole 15 provided in the closure 11. To be done. A plug (not shown) 16 for connecting a socket (not shown) is connected to an end of the instrument body 10 on the gas outflow side. A flange pipe 17 is connected to the gas inflow side end of the instrument body 10 with a gas safety valve B incorporated therein. A taper screw for connecting a gas pipe (not shown) is formed at the side end of the flange pipe 17.

As shown in FIG. 2, the gas safety valve B is incorporated in the flange pipe 17, and the tubular main body pipe 1 is composed of an inflow side member 1a and an outflow side member 1b. Outflow side 1 of body tube 1
A valve hole 4 is provided on the inlet side of the member 1b, and a tapered valve seat surface 5 having a diameter gradually decreasing toward the outflow side is formed on the outer periphery of the valve hole 4. A guide member 18 is mounted on the outflow side of the outflow side member 1b of the main body pipe 1 on the outflow side. The guide member 18 includes a fitting cylinder 18a on the outer periphery and a guide cylinder 1 on the center.
8b and a radial connecting portion 18c that connects the fitting cylinder 18a and the guide cylinder 18b, and the gap between the fitting cylinder 18a, the guide cylinder 18b, and the connecting portion 18c serves as the gas flow passage 19. There is. The inner circumference of the guide cylinder 18b is the guide hole 7, and the guide hole 7
Guide ridges 20 are provided on the inner periphery of the ridge so as to protrude in the circumferential direction. The valve body 2 movably installed in the main body tube 1 is formed into a disc shape with a synthetic resin, rubber, and a composite member in which a metal core is put in these, and the outer periphery of the valve body 2 is convex outward. A tapered contact surface 3 having an arcuate surface is provided, and the contact surface 3 contacts the valve seat surface 5 when the valve body 4 closes the valve hole 4. A guide rod 6 is projectingly provided at the center of the valve body 2. In the case of this embodiment, the guide rods 6 are provided on both the upstream side and the downstream side of the gas flow. A plurality of fine obstacle projections 9 are provided on the outer surface of the guide rod 6 protruding on the downstream side of the gas flow. A plurality of obstacle projections 9 are provided at equal intervals in the longitudinal direction of the guide, and every other projection is provided so as to project to the opposite side. The guide rod 6 having the obstacle protrusion 9 is slidably inserted into the guide hole 7, and as shown in FIG. 3, the inner diameter X of the guide protrusion 20 and the outer diameter dimensions Y, Z of the guide rod 6. Is Y <X <Z, and the guide rod 6 receives an obstacle and slides with respect to the guide hole 7. A guide member 21 is also provided on the inflow side member 1a of the main body tube 1. The guide member 21 is composed of a guide cylinder 21a on the inner circumference and a radial connecting portion 21b. A gap between the connecting portions 21b of the guide member 21 serves as a gas flow passage 22. The guide rod 6 projecting to the upstream side of the gas flow of the valve body 2 is slidably inserted into the guide cylinder 21a.

The gas safety valve B configured as described above operates as follows. When the gas is flowing in the normal state, as shown in FIG. 4 (a), the gas flow passage 22, the valve hole 4, and the gas flow passage are provided.
Gas flows through 19. At this time, the valve body 2 is pushed toward the upstream side of the gas by the force of the spring 8 so that the valve body 2 is separated from the valve hole 4. Now, when gas leakage occurs due to gas pipe breakage, gas pipe disconnection, etc., if the gas flow rate increases and the gas flow pressure rises, the valve is resisted against the spring 8 as shown in FIG. 4 (b). Body 2
Is pushed by the flow pressure of gas, the valve body 2 closes the valve hole 4, the contact surface 3 contacts the valve seat surface 5, and the flow of gas is blocked. When the valve body 2 is pushed and the guide rod 6 slides along the guide hole 7, it takes time to close the valve hole 4 because the guide rod 6 slides while being obstructed by the obstruction projection 9, but eventually the valve body 4 is closed. 2 closes the valve hole 4. In addition, the flow rate of gas increases momentarily even when the valve is opened, and the valve body 2 is pushed. However, since the flow rate of gas increases momentarily, the valve body 2 smoothly resists the spring 8. It does not move, and the open state of the valve body 2 is maintained.
That is, even if the valve body 2 is pushed, the obstacle protrusion 9 causes the guide rod 6 to
Does not slide smoothly with respect to the guide hole 7, and the valve body 2 moves to a position where the valve hole 4 is closed until the gas flow is in a normal state and the valve hole 4 is closed. do not do.

Further, the guide rod 6 of the valve body 2 is a through hole of the closed member 12 in the open state.
By moving the operation tool 13 to close the closing member 12 while entering the inside of the closing member 15, the cam surface 23 formed on the closing member 12 is moved as shown in FIGS. 5 (a) (b) (c). Press the guide rod 6 and press the valve body 2
Is reset from the valve hole 4 and the gas path is closed by the closure 12.

[Effects of the Invention] As described above, the present invention moves the valve body at a gas flow pressure above a certain level to close the valve hole and shut off the gas supply. The flow pressure of the valve rises and the valve element moves against the spring, the valve element closes the valve hole, shuts off the flow of gas and secures safety, and of course, guides it in the center of the valve element. The rod is projected at least toward the downstream side of the gas flow, and the guide rod is slidably inserted into the guide hole provided on the downstream side. When the valve body moves so as to close the valve hole, the guide hole is guided. Since the guide rod is provided with an obstacle protrusion to allow the valve to slide due to an obstacle, when a large amount of gas instantaneously flows at the beginning of opening, the flow pressure increases and the valve body When trying to move so as to block the hole, the guide rod is damaged by the obstacle protrusion Since it slides against the valve body, the flow pressure of gas does not decrease before the valve body blocks the valve hole, and the valve body does not block the valve hole. Does not cause a malfunction that the valve body operates to close the valve hole.Furthermore, a mechanism that prevents the valve body from malfunctioning due to the initial gas flow at the time of opening by the obstacle protrusion provided on the guide rod is provided. Since it is not related to the mounting direction, there is no restriction on the mounting direction.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view of the above gas safety valve, and FIGS. 3 (a) (b) (c) (d).
Is an explanatory view for explaining the relationship between the obstacle protrusion and the guide hole, FIGS. 4 (a) and 4 (b) are cross-sectional views for explaining the operation of the same, and FIGS. 5 (a), (b) and (c) are the resetting function of the same. 6 (a) is a cross-sectional view of a conventional example, FIG. 6 (b) is a left side view of FIG. 6 (a), and FIG. 6 (c) is of FIG. 6 (a). It is a right side view, 2 is a valve body, 4 is a valve hole, 6 is a guide rod, 7 is a guide hole, and 9 is an obstacle protrusion.

Claims (1)

(57) [Scope of utility model registration request] 1. A spring when a valve body provided in a gas supply path is moved at a gas flow pressure of a certain level or more to close a valve hole to cut off gas supply and the valve body has a fluid pressure of a certain level or less. In the gas safety valve for maintaining the valve open state by separating the valve body from the valve hole by means, a guide rod is provided at the central portion of the valve body so as to project at least toward the downstream side of the gas flow and is provided on the downstream side. The guide rod is slidably inserted into the guide hole, and when the valve body moves so as to close the valve hole, the guide rod is provided with an obstacle projection to allow the guide rod to slide due to the obstacle. Safety valve for gas.