JPS633514Y2 - - Google Patents

Description

[Detailed description of the device] This device moves the valve body using the gas flow pressure when the rubber tube comes off or when the gas tank is opened without the rubber tube attached, and gas flows under no load or high flow conditions. This invention relates to a gas connection device with a safety valve that closes the valve hole and cuts off the gas supply.

Conventionally, as shown in FIG. 4, a gas connection device with a safety valve has a spherical valve body 2 movably disposed in a gas supply pipe, and when the gas pressure rises above a certain level in a high flow state, the valve body 2 The valve body 2 is moved to close the valve hole 1 by pressing it against the valve hole 1, and the subsequent gas supply pressure continues to forcefully press the valve body 2 against the valve hole 1 to stop the gas supply. However, when gas is supplied, when the gas tank is opened, the flow is temporarily in a high flow state, as shown by a in FIG. The valve body 2, which is instantaneously activated and closed, continues to shut off the gas even if the high flow rate condition immediately subsides, and although it is safe, it may malfunction. There was a problem that it was difficult to use because it easily occurred. A safety valve that uses a diaphragm valve instead of a spherical valve body to close the valve hole has also been proposed, but such a diaphragm valve has a configuration that increases its stroke and delays its operation. This made it difficult to use as a safety valve, making it unsuitable for use as a safety valve.
In addition, when a thin plate-shaped valve body is used, there is a problem in that it is difficult to reset the valve body once the valve hole is closed.

The present invention was developed in view of these problems, and its purpose is to avoid the use of a spherical valve body that is easily actuated instantaneously, and to use a thin plate-shaped valve body. To provide a gas connecting device with a safety valve, which can increase the stroke of its valve body, can obtain a reliable delay effect, and can also be easily and reliably reset.

The present invention will be explained in detail below with reference to Examples. The gas fitting A is composed of a socket _A1 and a plug _A2 ,
The socket _A1 and the plug _A2 are detachably connected. Plug A ₂ is the tip side cylinder part 6
and a base-side cylinder part 7, and a distal-side cylinder part 6.
The fitted cylinder part 8b of the base side cylinder part 7 is fitted into the fitting cylinder part 8a and integrated. A spherical band surface 9 is provided on the outer periphery of the distal end of the distal end side cylinder portion 6, and a V-shaped groove portion 10 is provided on the outer periphery of the spherical band surface 9 on the base side. An acute-angled protrusion is provided around the inside of the outlet 11 at the tip of the tip-side cylindrical portion 6 to form a seat 12, and a bottomed cylindrical plug 13 is provided inside to face the seat 12. is arranged so that a packing 14 provided around the distal end surface of the plug body 13 can be brought into close contact with the catch seat 12. A spring 17 is interposed between the spring receiving part 15 of the plug body 13 and the spring receiving part 16 of the valve body mounting part 4 at the tip of the base side cylinder part 7, so that the outlet 11 is connected to the plug body 13. It is biased in the direction of closing. A push rod receiver 44 is protruded from the tip of the stopper 13, and an elastic body 45 such as a spring or a piece of rubber is housed inside the push rod receiver 44. Two protrusions 46 are provided around the outer periphery of the plug body 13, and an O-ring 47 for sealing is mounted between the protrusions 46. A valve hole 1 is provided in the plug body 13, and a communication hole 25 is provided on the base side of the plug body 13 from the gasket 14 and communicates with the outer periphery, and the valve hole 1 and the communication hole 25 communicate with each other. , the proximal end surface of the valve hole 1 serves as a valve seat 18. When the plug 13 is retracted to the outer periphery of the valve mounting portion 4 at the tip of the base side cylinder portion 7, the plug 1
A through hole 2 is provided on the inner circumference of the stopper 26 of the valve body mounting portion 4 by protruding a stopper 26 against which the proximal end surface of the valve body 2 is abutted.
7 is bored, and a sliding hole 28 is bored in the center of the valve body mounting portion 4. The valve body 2 is formed into a thin plate shape from a material such as synthetic resin, and has a bowl-shaped valve portion with an opening facing forward at the tip of a sliding rod 19 that is relatively long compared to the diameter of the valve body 2. 20, and a spring receiving ring 21 is provided at the base end. The sliding rod 19 of the valve body 2 is slidably inserted into the sliding hole 28, and a spring 3 such as a coil spring is interposed between the spring receiving ring 21 and the valve body mounting portion 3. The spring 3 is not limited to a coiled spring made of a wire wound around it, but may be anything that acts as a spring, such as a leaf spring or an elastic body such as rubber. The safety valve is composed of the valve body 2, the valve hole 1, and the valve seat 18. A seal cylinder 22 made of an elastic body is housed on the inner periphery of the base of the base side cylinder part 7, so that a gas outlet fitting 23 of a gas pipe can be press-fitted into the seal cylinder 22 and connected. . Socket A ₁ is socket inner cylinder 3
0, a socket outer cylinder 31, an operating ring 32, a bellows-shaped packing 41, a push rod 42, coil springs 33, 38, etc. A bellows-shaped packing 41 is housed inside the socket inner cylinder 30, and the bellows-shaped packing 41 is wound around the outer circumference of the bellows-shaped packing 41 and stretched by a coil spring 33. A metal ring 34 is provided around the outer periphery of one end of the bellows-shaped packing 41, and a band-shaped ring portion 35 is provided around the end surface where the metal ring 24 is located. A plurality of through holes 36 are bored in the socket inner cylinder 30, and a ball 37 is loosely fitted into the through holes 36. A socket outer cylinder 31 is fitted on the outer periphery of the socket inner cylinder 30, and an operating ring 3 is fitted between the socket inner cylinder 30 and the socket outer cylinder 31.
2 is slidably attached. Socket outer cylinder 31
A coil spring 38 for returning the operating ring 32 is interposed between the operating ring 32 and the operating ring 32, and a stepped portion 39 on the inner circumference of the operating ring 32 engages the ball 37. here 40
is a protruding ring portion to which a stepped portion 39 is engaged by the spring force of the coil spring 38 when the plug A ₂ is connected to the socket A ₁ .

Then connect plug A ₂ to the pipe and connect socket A _1.
When the tip of the plug A ₂ is inserted into the socket inner cylinder 30 of the socket A ₁ with the plug A _{2 connected to the rubber hose of the gas appliance, the spherical surface 9 of the tip of the plug A 2} will touch the band ring portion 35 of the bellows packing 41. When the plug A ₂ is press-fitted into the socket inner cylinder 30 while maintaining airtightness by pressing and compressing the bellows-like packing 41 against the coil spring 33, the push rod 42 whose tip is inserted into the push rod receiving cylinder 44 is inserted. the plug 13 is retracted and the outlet 11 is opened, allowing gas to advect through the plug A ₂ and the socket A ₁ ;
On the other hand, the ball 37 in the through hole 36 falls into and is locked in the V-shaped groove 10 at the tip of the plug A, and the operating ring 32 is pressed by the coil spring 38 to prevent the ball 37 from coming off, and the stepped part 39 It engages the protruding ring portion 40 and connects the socket A ₁ and the plug A ₂ . When the plug body 13 is moved back, the rear end surface of the plug body 13 comes into contact with the stopper 26, and a predetermined gap is formed between the valve seat 18 and the valve portion 20 of the valve body 2. At this time, even if there is some variation in the dimensions of the push rod 42, plug body 13, and stopper 26, it can be absorbed by the elastic body 45 in the push rod receiver 44.
When using a gas appliance, the through hole 27, as shown in Figure 1,
Gas flows through the outer periphery of the valve portion 20 of the valve body 2 of the safety valve, the valve hole 1, the outlet 11, and the bellows-shaped packing 41 of the socket _A1 . When a gas appliance is used, the flow rate of gas is small, so gas flows between the valve seat 18 and the valve portion 20 of the valve body 2, and the valve body 2 does not move. By the way, if the rubber tube ruptures or comes off on the gas appliance side of socket A ₁ and gas leaks, the gas outlet side of valve hole 1 is depressurized and a pressure difference is created between the gas inlet and outlet sides. Due to this pressure difference, the valve body 2 moves against the spring 3, and the valve portion 20 of the valve body 2 comes into contact with the valve seat 18 as shown in FIG.
is blocked and gas advection is blocked. socket
To disconnect A ₁ and plug A ₂ , push back the operating ring 32 against the coil spring 38 and pull out the plug A ₂ . Then, the ball 37 returns into the through hole 36 and hits the stepped portion 39, causing the bellows-like packing 41 to expand, while the stopper 13 returns due to the spring 17 and hits the seat 1.
2 and the outlet 11 is closed. Furthermore, when the socket _A1 and the plug _A2 are connected, the plug body 13 is retracted and the valve seat 18 and the valve portion 20 of the valve body 2 are close to each other, so that when the safety valve is operated, the valve body 2 Although the valve hole 1 is blocked by the valve part 20,
When the socket _A1 and the plug _A2 are removed, the plug body 13 returns and comes into close contact with the catch seat 12, the valve portion 20 of the valve body 2 of the safety valve is separated from the valve seat 18, and the safety valve returns to its original state.

As described above, the present invention is formed integrally with a thin plate-shaped valve body, and a sliding rod that is relatively long compared to the diameter of the valve body is slidably inserted into the sliding hole of the valve body mounting part. The valve body is provided with a spring that allows the body to move freely in the gas flow direction and urges the valve body to move away from the valve hole. The valve body is set to be strong enough to move downstream in the gas supply direction and block the valve hole with the valve body against the When the gas supply pressure exceeds a certain level due to a break or a break, the valve element is pressed against the valve hole against the spring force, blocking the valve hole and urgently cutting off the gas supply thereafter to ensure safety. In this way, safety is ensured by emergency shutoff, but a sliding rod that is formed integrally with the valve body and is relatively long compared to the diameter of the valve body is inserted into the sliding hole of the valve body mounting part. Because the valve body is slidably inserted into the gas flow direction, the valve body can be moved freely in the direction of gas flow, so the valve body can move freely in the direction of gas flow from the time when the valve body starts pushing against the spring force until the valve body completely blocks the valve hole. The stroke for closing can be set long by the length of the sliding rod, and the stroke of the valve body can be lengthened in this way, so even if there is a temporary high flow state, such as when the gas tank is opened, for example. The long stroke of the valve body combined with the spring force allows the valve body to be actuated instantaneously, preventing malfunctions in which the valve body is actuated in an instantaneous high flow state. In this way, instantaneous activation can be eliminated and the valve element can be activated with a delay, and the valve element can be moved to shut off the gas only in an emergency where a high flow rate continues for a certain period of time, eliminating malfunctions.
We have now been able to provide a gas connection with a safety valve that is suitable for actual situations and easy to use.

Moreover, especially in the present invention, when the socket of the gas connection device and the plug are connected, a plug body is provided at the outlet of the plug, the tip of which is pressed by the push rod of the socket and opened against the closing spring. Since the valve body is equipped with a spring that urges the valve body to move away from the hole, in the gas supply path after the gas connection with a safety valve, if the rubber pipe comes off or breaks, the gas supply pressure will not exceed a certain level. After the safety valve is activated by moving the valve body toward the valve hole and closing the valve hole,
When the socket is removed from the plug, the closing spring separates the plug from the valve body, and the spring that biases the valve body away from the valve hole also causes the valve body to return away from the plug, and the socket closes. The safety valve can be reset by simply disconnecting the valve and the plug, and the structure is extremely simple, requiring no separate special mechanism for reset.

[Brief explanation of drawings]

Fig. 1 is a half-sectional view of one embodiment of the gas connection device with a safety valve of the present invention, Fig. 2 is a sectional view of the same plug, Fig. 3 is a sectional view illustrating the operation of the same safety valve, and Fig. 4 is A sectional view of the conventional example, and FIG. 5 is a state diagram showing changes in gas pressure, where A is a gas connector, _A1 is a socket, A2 is a plug, ₁ is a valve hole, 2 is a valve body, 1
3 is a plug body, 17 is a closing spring, 42 is a push rod, 3
19 is a sliding rod, 25 is a communication hole, and 28 is a sliding hole.

Claims (1)

[Scope of utility model registration request] A plug body is provided at the outlet of the plug, the tip of which is pressed by the push rod of the socket to open against the closing spring when the socket of the gas connection device and the plug are connected, and the tip of the plug body is closed. The open rear opening of the cylindrical plug body is made into a cylinder, and the open rear opening of the cylindrical plug body is the valve hole. A communicating hole is provided to communicate with the
A thin plate-shaped valve body that closes the valve hole of the stopper that is pressed backward to open the outlet when the socket and plug are connected is placed facing the valve hole at a certain distance on the gas supply side. A sliding rod, which is formed integrally with the valve body and is relatively long compared to the diameter of the valve body, is slidably inserted into the sliding hole of the valve body mounting part to move the valve body in the direction of gas flow. The valve body is provided with a spring that is movable and urges the valve body to move away from the valve hole, and the spring force of this spring is applied to the valve body to resist the spring force and force the valve body to move away from the valve hole. A gas connector with a safety valve that is moved downstream in the gas supply direction and set to a strength that allows the valve body to close the valve hole.