JPS5934789Y2 - pipe fittings - Google Patents

Description

[Detailed description of the invention] The present invention relates to a gas leakage prevention structure for a pipe connector, and its gist is that the outflow side cylindrical part 1a, which is the gas outflow side, and the inflow side, where the head 2 of the plug B is inserted, The socket body 1 is placed at the tank bottom from the cylindrical part 1b, and the push rod 4 for pushing the valve body 3 of the plug B is protruded from the inside of the outflow side cylindrical part 1a toward the open end surface of the inflow side cylindrical part 1b. In a pipe connector having a bellows-like packing 5 that can be expanded and contracted on the inner periphery of the cylindrical portion 1b, an elastic member 6 is provided in order to bring the outer periphery of the tip of the bellows-like packing 5 into airtight pressure contact with the inner periphery of the inlet-side cylindrical portion 1b. This relates to a pipe connector which is provided around the inflow side and holds a steel ball 7 for connecting a plug B on the opening side of the elastic member 6 of the inflow side cylindrical portion 1b.

In the conventional pipe connector (socket), as shown in FIG. A bellows-shaped packing 5' made of rubber is fitted into the inner periphery of the inflow-side cylindrical part 1b', protruding from the boundary with the border of the inflow-side cylindrical part 1b' to near the opening end surface of the inflow-side cylindrical part 1b', and a coil spring on the outer periphery of the bellows-shaped packing 5'8' urges the extension of the bellows-like packing 5', and prevents a part of the body 5a' from sinking inward when the bellows-like packing 5' is compressed, thereby preventing gas flow from being obstructed. The shape is maintained by a spring 9' inserted into the inner periphery of the bellows-like packing 5'.

This bellows packing 5' is made of a material with a longer lifespan than that of a commonly used rubber hose, but a durable material such as a reinforced rubber hose (for example, one wrapped with cloth or glass fiber) 7 is used. When used in special rubber hoses, even higher performance is required.

In other words, as the bellows-like packing 5' expands and contracts, the relatively thin body 5a' undergoes repeated deformation and deteriorates or ages, resulting in holes and cracks, as shown by the arrows in FIG. There is a risk of gas leaking from the socket A' to the outside through a path such as this, which raises concerns about safety.

The present invention was developed in view of the drawbacks of the conventional examples mentioned above, and its purpose is to prevent gas from leaking from the socket to the outside even if the bellows-like packing deteriorates or ages and develops holes or cracks. To provide a pipe connector that does not leak and has excellent safety.

The present invention will be explained in detail below using examples.

As shown in FIG. 3, the socket A includes a socket main body 1,
It is composed of a push rod 4, a bellows-like gasket 5, an operating ring 10, and the like.

The socket body 1 has a bottom shape made of hard synthetic resin material, etc., and consists of a small-diameter outflow-side cylindrical portion 1a and a large-diameter inflow-side cylindrical portion 1b. A spring receiving part 11 is provided protrudingly on the side, and a plurality of through holes 12 are bored in the side wall of the inflow side cylinder part 1b at the front part of the inflow side cylinder part 1b (on the opening side of the inflow side cylinder part). , inlet side cylinder part 1
A protruding edge 13 is provided around the outer circumferential surface of the front end of b.

The diameter of the opening on the outer circumferential side of the inflow side cylindrical portion 1b of the through hole 12 is larger than the diameter of the steel ball 7 fitted into the through hole 12, and the opening diameter on the inner circumferential side is smaller than the diameter of the steel ball 7.

Further, an annular elastic member 6 having elasticity is provided around the inner circumferential surface of the inflow side cylinder portion 1b deeper than the through hole 12.

A fixing collar 14 is integrally provided at the base end of the push rod 4 at right angles to the push rod 4, and the fixing collar 14 has a plurality of openings 15 for gas circulation.

This push rod 4 is delivered into the inflow side cylinder part 1b so as to be located on the axis of the inflow side cylinder part 1b, and is fixed inside the inflow side cylinder part 1b by fitting the fixing collar part 14. The tip of 4 protrudes close to the opening end surface of the inflow side cylindrical portion 1b.

The operating ring 10 has a bottom shape made of a flame-retardant synthetic resin material or metal material, and a stepped portion 16 is formed on the inner circumference of the operating ring 10, so that the front inner peripheral surface 10a of the stepped portion 16 is connected to the rear inner peripheral surface. 10b, and the rear inner circumferential surface 10b is brought into almost perfect contact with the outer circumferential surface of the inflow side cylinder part 1b.

Then, the spring 17 is extrapolated onto the outer circumferential surface of the inflow side cylindrical portion 1b,
A steel ball 7 having a diameter larger than the thickness of the side wall of the inlet cylinder portion 1b is loosely fitted into the through hole 12.

The operation ring 10 is fitted onto the outer periphery of the inflow side cylinder part 1b,
The operating ring 10 is locked with its stepped portion 16 in contact with the protrusion 13.

The spring 17 urges the slidable operating ring 10 to protrude forward between the spring receiving portion 11 and the rear end of the operating ring 10, and is fitted into the outer periphery of the inflow side cylinder portion 1b.

The bellows-like packing 5 has flanges 18a and 18b at both ends of a relatively thin body 5a, and a flange 1 on the tip side.
A metal ring 19 is fitted onto the outer surface of 8b, and an elastic belt-shaped ring portion 21 is protruded from the tip.

The bellows-shaped packing 5, except for the metal ring 19, is integrally formed of an elastic material such as NBR.

The bellows-like packing 5 expands and contracts as the body 5a deforms, and a coil spring 8 is inserted around the outer periphery of the body 5a to force the bellows-like packing 5 to expand.

This bellows-shaped packing 5 is fitted into the inflow-side cylindrical portion 1b, and its proximal end is fixed to the back of the inflow-side cylindrical portion 1b with a washer 20, and its distal end is free, and the bellow-shaped packing 5 on the free side The metal ring 19 of the packing 5 is in airtight pressure contact with the elastic member 6 of the inflow side cylinder portion 1b.

When this socket A is not connected, the bellows-like packing 5 is extended as shown in FIG. The operating ring 10, which protrudes from the outer circumferential surface of the side cylinder portion 1b, is pushed in against the spring 17 so that the stepped portion 16 on its inner circumference touches the upper surface of the above-mentioned protruding steel ball 7. are locked in contact.

In this state, as shown in FIG. 5, when the plug B is inserted into the socket body 1, the spherical zone surface 22
is pressed against the belt-shaped ring part 21 of the bellows-shaped packing 5, and presses the inside of the socket body 1 into the plug B while compressing the bellows-shaped packing 5 against the elastic force of the coil spring 8. Then, the valve body 3 is pushed by the push rod 4. The valve body 3 is opened by being retracted, and the gas flowing out from the plug B through the bypass groove 23 flows into the inflow side cylindrical part 1b, and further into the outflow side cylindrical part 1a.
It flows out through the inside and into the hose.

When the bellows-shaped packing 5 is further compressed and the inside of the socket body 1 is inserted into the plug B, the V-shaped groove 24 provided around the outer peripheral surface of the head 2 of the plug B comes to be directly below the through hole 12 of the socket body 1.

At this time, the steel ball 7 was in contact with the bellows-shaped gasket 5 on the top surface.
The metal ring 19 on the outer periphery of the flange 18b is missing,
On the other hand, the upper surface of the steel ball 7 is pushed by the stepped portion 16 of the operating ring 10, so when it falls into the V-shaped groove 24 of the plug B, the operating ring 10, which was locked on the upper surface of the steel ball 7, becomes free, and the spring 17
The rear inner circumferential surface 10 of the operating ring 10
b is above the steel ball 7 and prevents the steel ball 7 from protruding to the outer circumferential surface of the inflow side cylindrical portion 1b.
4 is locked to the steel ball 7, and the socket A and the plug B
It becomes impossible to get rid of it naturally.

9 indicates the body portion 5 when the bellows-like packing 5 is compressed.
This is a spring that maintains the bellows-shaped packing 5 in a cylindrical shape so that the bellows-shaped packing 5 does not deform and collapse toward its inner circumference and obstruct the flow of gas.

When the socket A and the plug B are connected, the elastic force of the compressed coil spring 8 causes the band-shaped ring portion 21 to
is brought into pressure contact with the spherical surface 22 of the plug B to maintain airtightness between the tip of the bellows-shaped packing 5 and the tip of the plug B, and the flange 18a of the bellows-shaped packing 5
is pressed against the inner wall of the inflow side cylindrical portion 1b by a washer 20 to keep the base end of the bellows-shaped packing 5 airtight and prevent gas from leaking out of the bellows-shaped packing 5.

The elastic member 6 on the inner periphery of the inflow side cylinder portion 1b is a bellows-shaped packing 5.
Since the through hole 12 which is in airtight elastic contact with the outer periphery of the metal ring 19 at the tip and which holds the steel ball 7 is located on the opening side of the elastic member 6, the body of the bellows-shaped packing 5 is relatively thin. Even if holes or cracks occur in the body 5a during repeated deformation of the body 5a, the gas leaking to the outer circumferential side of the bellows-like packing 5 through the holes or cracks will be transferred to the elastic member 6. This prevents the gas from leaking to the outside of the socket A without further progressing the gas leakage.

6 and 7 show another embodiment of the present invention, in which a flange 18 at the free end of the bellows-like packing 5 is shown.
A concave groove 25 is provided around the outer periphery of the metal ring 19 fitted on the outside of the metal ring 19, and an annular elastic member 6 having elasticity is fitted into the concave groove 25. airtightly,
It is pressed together so that it can slide freely.

Therefore, even if gas leaks through the bellows-shaped packing 5 when connected to the plug B, the gas leaking to the outer circumference of the bellows-shaped packing 5 will be prevented by the seal between the elastic member 6 and the inner circumferential surface of the inflow-side cylindrical portion 1b. This prevents gas leakage from proceeding any further and prevents gas from leaking to the outside of socket A.

As described above, the present invention has a push rod protruding from the outflow side cylindrical part toward the open end surface of the inflow side cylindrical part for pushing the valve body of the plug,
In a pipe connector having a bellows-like packing that can be expanded and contracted on the inner periphery of an inflow-side cylindrical part, an elastic member is provided to bring the outer periphery of the tip of the bellows-like packing into airtight pressure contact with the inner periphery of the inflow-side cylindrical part. Since the steel ball for connecting the plug is held on the opening side of the elastic member of the inflow-side cylindrical part, when connecting the socket and the plug, the outer periphery of the tip of the bellows-shaped packing and the inflow Because the elastic member is in airtight pressure contact with the inner circumferential surface of the side tube, the relatively thin body of the bellows-like packing is repeatedly deformed, and in the unlikely event that the body becomes perforated or cracked. Even if something like this occurs, the gas that passes through these holes or cracks and leaks to the outer periphery of the bellows-shaped packing is stopped by the elastic member between the outer periphery of the tip of the bellows-shaped packing and the inner periphery of the inlet-side cylindrical part. There is an advantage that gas leakage does not progress as described above, and gas is prevented from leaking to the outside of the socket, resulting in excellent safety.

[Brief explanation of the drawing]

Fig. 1 is a side view of a conventional socket with the upper part cut away, Fig. 2 is a side view of the above socket with the upper half cut away when the socket is connected to a plug, and Fig. 3 shows an embodiment of the present invention. 4 is a side view with the upper half cut away, FIG. 4 is a view taken in the direction of the X arrow in FIG. 3, FIG. 5 is a side view with the upper half cut away when the above socket is connected to a plug, and FIG. FIG. 7 is a side view with the upper half cut away showing another embodiment of the present invention, and FIG. 7 is a side view with the upper half cut away when the above socket is connected to a plug. DESCRIPTION OF SYMBOLS 1... Socket body, 1a... Outflow side cylindrical part, 1b... Inflow side cylindrical part, 2... Head of plug, 3... ...Plug valve body, 4...
... Push rod, 5 ... Bellows-like packing, 6 ...
...Elastic member, 7... Steel ball, B...
plug.

Claims (1)

[Scope of utility model registration request] The socket body is constructed from the outflow side cylindrical part, which is the gas outflow side, and the inflow side cylindrical part, into which the head of the plug is inserted, and the valve body of the plug is inserted from the inside of the outflow side cylindrical part toward the open end surface of the inflow side cylindrical part. In a pipe connector that has a protruding push rod for pushing and a bellows-like packing that can be freely expanded and contracted on the inner periphery of the inflow-side cylindrical part, there is an airtight connection between the outer periphery of the tip of the bellows-shaped packing and the inner periphery of the inflow-side cylindrical part. A pipe connector that has an elastic member surrounding it for pressure contact, and holds a steel ball for plug connection on the opening side of the elastic member of the inflow side cylinder.