JPS627906Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a safety device for a gas path in which a valve hole is closed by a valve body when a pressure difference of more than a predetermined value occurs between a gas inflow side and a gas outflow side. It is.

In the conventional gas route safety device, as shown in FIG.
A plate-shaped valve body 2 made of an elastic material and having a larger diameter than the valve hole 1 is arranged on the gas inflow side, and the valve body 2 is slightly spaced apart from the valve body 2 on the gas inflow side. A cover body 41 having a larger diameter than the body 2 is disposed in the base side cylinder part 7 constituting a gas path, and gas is communicated with the valve hole 1 between the outer peripheral edge of the cover body 41 and the inner surface of the base side cylinder part 7. A flow path 42 is provided, and a small hole 4 is formed in the radially intermediate portion of the cover body 41 to guide gas from the front side of the valve body 2 to the back side of the valve body 2 to the valve hole 1.
The center part of the valve body 2 is fixed to the center of the valve hole 1, and the outer peripheral part of the valve body 2 is bent when a pressure difference of more than a predetermined value is generated between the gas inlet side and the gas outlet side. It is a blocking part 3 that closes the valve hole 1 by closely contacting the surrounding partition wall 43. Therefore, when the gas is flowing normally, the gas inflow side and the gas can be connected by adjusting the gas amount of the gas appliance. When a pressure difference momentarily occurs between the gas outlet side and the gas outlet side, the gas pressure P ₂ ' in the space between the valve body 2 and the partition wall 43 instantly becomes the same as the gas pressure P ₂ on the gas outlet side through the valve hole 1. However, since the gas pressure P ₁ ' in the space between the valve body 2 and the cover body 41 is changed through the small hole 4 in the cover body 41, the gas on the gas inflow side momentarily changes. The pressure will not be the same as pressure P ₁ ,
The presence of this small hole 4 prevents the valve body 2 from being inadvertently closed due to instantaneous pressure changes when gas is flowing normally. However, in the case of such a conventional gas route safety device, the gas inlet 11 to which the gas outlet fitting of the gas piping is connected
Because a and the cover 41 directly face each other,
At the moment the gas outlet is opened, the gas blown out from the gas outlet cap directly hits the cover body 41, and this gas passes through the small hole 1 and pushes the front face of the closing part 3 of the valve body 2 with force, so that the sixth As shown by the imaginary line in the figure, there was a problem in that the valve body 2 radiated and blocked the valve hole 1.

The present invention was developed in view of the above points, and its purpose is to soften the force of the gas flow blown out from the gas outlet at the moment the gas tank is opened, before it hits the cover. An object of the present invention is to provide a safety device for a gas path that can prevent a valve body from being bent and inadvertently blocking a valve hole.

Hereinafter, the present invention will be explained in detail based on the embodiments shown in FIGS. 1 to 4. Reference numeral A denotes a safety device disposed in the gas path, and is composed of a socket A ₁ and a plug A ₂ , and the socket A ₁ and the plug A ₂ are detachably connected. Plug A ₂
is composed of a distal end side cylinder part 6 and a base side cylinder part 7. 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. A seat 12 is formed by surrounding an acute angle protrusion on the inside of the gas outlet 11b at the tip of the tip-side cylindrical portion 6, and the gas outlet 11b and a valve hole are formed inside the seat 12 facing the seat 12. 1, a plug 13 is disposed such that it can freely slide along the inner circumferential surface of the distal end side cylinder portion 6, and a gasket 14 provided around the distal end surface of the plug 13 is in close contact with the catch seat 12. It is becoming possible to do so. A gas circulation groove 46 is formed in the outer peripheral surface of the stopper 13 . Spring receiving part 15 of plug body 13
A spring 17 is interposed between the spring receiving portion 16 at the tip of the base-side cylindrical portion 7, and is biased in a direction to close the gas outlet 11b with the plug body 13. A valve hole 1 is bored in the outer periphery of the partition wall 43 at the tip of the base side cylinder part 7. The valve body 2 is made of an elastic material such as rubber such as butadiene acrylonitrile rubber or elastic synthetic resin, and is formed into a plate shape with a diameter larger than that of the partition wall 43. The inner circumference of the valve body 2 has a bend for bending. Part 2
1, and a closing portion 3 for closing the valve hole 1 by closely contacting the partition wall 43 is provided on the outer peripheral edge of the valve body 2. Reference numeral 41 denotes a cover body that covers the valve body 2. The peripheral wall 44 is formed in the shape of a thick-walled cylindrical body with a bottom. The central portion of the valve body 2 is fitted, and the peripheral portion of the valve body 2 is slightly spaced apart from the bottom plate 45 and the peripheral wall 44. Large holes 47 are bored in a direction perpendicular to the thickness direction of the peripheral wall 44 of the cover 41, and cutouts 48 communicating with the large holes 47 are provided, and the large holes 47 are formed at equal intervals in the circumferential direction. A small hole 4 is bored in the bottom plate 45 of the cover 41, and a gas flow path 42 is formed by a large hole 47 and a notch 48. A gas inlet 11a is formed at the base of the base-side cylindrical portion 7. Reference numeral 18 denotes a buffer plate disposed between the cover 41 and the gas inlet 11a to soften the flow of gas, and is formed to have a slightly larger cross-sectional area than the gas inlet 11a. A guide groove 53 is formed in the cover body 41, and a holding portion 60 of the buffer plate 18 is fitted into the guide groove 53 so as to be movable in the front and rear directions.
19 is a buffer spring for biasing the buffer plate 18 in the direction of the gas inlet 11a;
The spring force of this buffer spring 19 moves the buffer plate 18 between the glass inlet 1 and the cover body 41.
It is brought into elastic contact with a catch seat 61 fixed to the periphery of 1a. The spring characteristics of the buffer spring 19 are determined by the gas inlet 11a.
The gas flowing in from the buffer plate 18 hits the buffer plate 18 and is bent by the force pushing the buffer plate 18. The safety valve is composed of the above-described valve body 2, cover body 41, valve hole 1, buffer plate 18, and buffer spring 19, and gas flows from the gas inlet 11a through the safety valve to the gas outlet 11a. . The release means for releasing the valve body 2 from the valve hole 1 which is blocking the valve hole 1 due to a pressure difference of a predetermined value or more between the gas inflow side and the gas outflow side is a seal body 5 attached to the stopper body 13.
4, a release hole 25 bored in the center of the valve body 2,
The guide hole 55 is provided through the center of the partition wall 43 and guides the seal body 54 . The seal body 54 is disposed so as to face the release hole 25, so that the distal end surface of the seal body 54 can come into close contact with the periphery of the release hole 25.
The seal body 54 has a cylindrical shape with a bottom and is loosely fitted onto the guide rod 56 of the plug body 13. A spring 59 is inserted between the spring receiver 57 of the guide rod 56 and the spring receiver 58 of the seal body 54. A seal body 54 is interposed and biased by a spring in a direction to close the release hole 25.
A seal cylinder 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 of a gas pipe can be press-fitted into the seal cylinder and connected. The socket _A1 is composed of a socket outer cylinder 31, an operating ring 32, a bellows-shaped packing 52, a push rod 51, coil springs 33, 38, and the like. A bellows-shaped packing 52 is housed inside the socket inner cylinder 30, and the bellows-shaped packing 52 is extended by a coil spring 33 wound around the outer circumference of the bellows-shaped packing 52. A metal ring 34 is provided around the outer periphery of one end of the bellows-shaped packing 52, and a band-shaped ring portion 35 is provided around the end surface where the metal ring is located. A plurality of through holes 36 are formed 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 onto the outer periphery of the socket inner cylinder 30, and the socket inner cylinder 30 and the socket outer cylinder 31 are connected to each other.
It is slidably attached to the operating ring 32 between.
The operating ring 3 is located between the socket outer cylinder 31 and the operating ring 32.
A coil spring 38 is interposed to return 2.
A stepped portion 39 on the inner circumference of the operating ring 32 engages the ball 37. Here, 40 is the stepped part 3 due to the spring force of the coil spring 38 when plug A ₂ is connected to socket A ₁ .
9 is the protruding ring portion that is engaged.

Then, connect plug A ₂ to the gas outlet fitting (not shown) of the gas pipe, and connect socket A ₁ to the rubber hose of the gas appliance.
When the tip of plug A ₂ is inserted into the socket inner cylinder 30 of socket A ₁ , the spherical band surface 9 at the tip of plug A ₂ comes into pressure contact with the band-shaped ring portion 35 of the bellows-shaped packing 52 to maintain airtightness, and furthermore, the coil spring 33 When the plug A ₂ is press-fitted into the socket inner cylinder 30 while compressing the bellows-like packing 52 against the pressure, the plug body 13 is retracted by the push rod 51 and the gas outlet 11b is opened, and the gas flows through the plug A ₂ and the plug A 2 . Advection becomes possible through socket _A1 . When the gas tank of the gas pipe is opened in this state, as shown in FIG. While pushing in the direction, the force of the gas flow is weakened and the gas flows through the gas flow path 42 and the small hole 4 to reach the gas outlet 11b. In this way, the force of the gas flow blown out from the gas outlet can be considerably weakened by the time it reaches the small hole 4 of the cover 41. Figures 3 and 4 show the operation of the valve body 2 when gas leaks due to the gas rubber tube being torn or detached. In this case, the gas outflow side of the valve hole 1 is depressurized and a pressure difference is created between the gas inflow side and the gas outflow side, and the closing part 3 of the valve body 2 is pushed by the gas flow flowing in from the small hole 4, and the closing part 3 comes into close contact with the partition wall 43 around the valve hole 1, thereby closing the valve hole 1 and blocking the movement of gas. In addition, if the small hole 4 is provided at a position opposite to the closing part 3, the closing operation of the closing part 3 can be made even more reliable. In addition, if there are no accidents such as gas leaks and gas is flowing normally within the specified value, there may be an instantaneous pressure difference between the gas inflow side and the gas outflow side by adjusting the gas amount of the gas appliance. When this occurs, as shown in FIG. 3, the gas pressure P ₂ ' in the space S ₂ between the valve body 2 and the partition wall 43 instantly becomes the same pressure as the gas pressure P ₂ on the gas outlet side through the valve hole 1. However, since the pressure change in the gas pressure P ₁ ' in the space S ₁ between the valve body 2 and the cover body 41 is carried out through the small hole 4, the gas pressure P ₁ ' instantaneously changes due to the gas inflow. The gas pressure on the side cannot change to the same pressure as P ₁ ,
Therefore, the valve body 2 does not bend, and the valve body 2 does not close due to the above-mentioned instantaneous pressure change when gas is flowing normally. Next, when disconnecting the socket A ₁ and the plug A ₂ , hold the operating ring 32 between the coil springs 3 and 3.
8 and pull out plug A ₂ . Then, the ball 37 returns inside the through hole 36 and hits the stepped portion 39,
The bellows-like packing 52 is extended, and the stopper 13 is returned by the spring 17 and comes into contact with the seat 12, thereby closing the gas outlet 11. Further, when the socket A ₁ and the plug A ₂ are connected, the plug body 13 is retracted and the seal body 54 is also retracted so that the contact surface 60 at the tip of the seal body 54 is inserted into the release hole 25 as shown in FIG. Closely adheres to the surrounding area. At this time, the spring 59
is compressed, and the seal body 54 is spring-biased in the direction of the release hole 25. As a result, the release hole 25 is closed and gas does not flow through the release hole 25. Then, as shown in Figure 1, when socket A ₁ and plug A ₂ are removed,
The plug body 13 returns and comes into close contact with the seat 12, and the seal body 54 separates from the release hole 25.
Gas flows into the tip-side cylindrical portion 6, and as a result, there is no pressure difference between the gas inflow side and the gas outflow side with the valve body 2 as a boundary, and the valve hole 1 is no longer blocked by the valve body 2.

As described above, the present invention provides a movable buffer plate between the cover body and the gas inlet to open and close the gas inlet, and the gas flowing in from the gas inlet is bent by pressing the buffer plate. Since the buffer spring is interposed between the cover and the buffer plate, when the gas stop of the gas piping is opened, the gas flowing from the gas outlet to the gas inlet first hits the buffer plate and buffers the buffer plate. While pushing towards the cover body against the spring force of the spring, the force of the gas is weakened and then allowed to reach the cover body, so that this gas flow passes through the small hole to the obstructed part of the valve body. The force when pressing can be considerably weakened compared to the force when the gas flows directly from the gas inlet, and as a result, it is possible to prevent the valve body from inadvertently blocking the valve hole when opening the gas tank. This effect is produced.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view of a plug according to an embodiment of the present invention.
Figure 2 is a half sectional view of the safety device as described above, Figures 3 and 4 are sectional views showing the operation of the safety valve as described above, and Figure 5
The figure is a half-sectional view of a conventional plug, and FIG. 6 is a half-sectional view of the same safety device, in which 1 is a valve hole, 2 is a valve body, 3 is a blocking part, 4 is a small hole, and 11a is a gas 18 is a buffer plate, 19 is a buffer spring, 41 is a cover, 42 is a gas flow path, and 43 is a partition.

Claims (1)

[Scope of utility model registration request] A plate-shaped valve body made of an elastic material and having a larger diameter than the valve hole is arranged on the gas inflow side of the valve hole provided in the partition wall of the gas path, and a plate-shaped valve body that is made of an elastic material and has a larger diameter than the valve hole is placed on the gas inflow side than the valve body. A cover body having a larger diameter than the valve body is arranged in the base-side cylindrical part constituting the gas path, and is spaced apart from the cover body, and a gas flow passage communicating with the valve hole is provided between the outer peripheral edge of the cover body and the inner surface of the base-side cylindrical part. At the same time, a small hole is formed in the radial middle part of the cover body to guide gas from the front side of the valve body to the back side of the valve body, and the center part of the valve body is fixed to the center of the cover body, and the valve body The outer circumferential side of the gas valve is used as a blocking part that bends when a pressure difference of more than a specified level is generated between the gas inflow side and the gas outflow side and closes the valve hole by sticking to the partition wall around the valve hole. In route safety devices, a movable buffer plate that opens and closes the gas inlet is provided between the cover and the gas inlet, and the buffer is bent when the gas flowing in from the gas inlet presses the buffer plate. A gas route safety device consisting of a spring interposed between a cover body and a buffer plate.