JPS603432Y2 - 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, A push rod 4 for pushing the valve body 3 of the plug B is protruded from inside the outflow side cylinder part 1a toward the open end surface of the inflow side cylinder part 1b. In a pipe connector having a bellows-like packing 5 that can be freely expanded and contracted on the inner periphery of the part 1b, an elastic member 6 is provided for airtightly pressing the tip of the bellows-like packing 5 onto the outer periphery of the tip, and an airtight elastic member 6 is attached to the tip of the head 2 of the plug B. A seal member 7 for making pressure contact with the inflow side cylinder part 1b is provided around the inner peripheral surface of the inflow side cylinder part 1b, and a steel ball 8 for connecting the plug B is provided on the opening side of the elastic member 6 and the seal member 7 of the inflow side cylinder part 1b. This relates to pipe fittings that must be maintained and protected.

In the conventional pipe connector (socket), as shown in FIG. 1, a push rod 4' for pushing the valve body 3' of the plug B' is connected to an outflow side cylinder part la' and an inflow side cylinder part 1b'. It protrudes from the border to near the opening end surface of the inflow side cylinder part 1b', and the inflow side cylinder part 1
Insert a rubber bellows-like packing 5' into the inner circumference of b',
The coil spring 9' on the outer periphery of the bellows-shaped packing 5' urges the expansion of the bellows-shaped packing 5', and when the bellows-shaped packing 5' is compressed, a part of its body 5a' collapses inward. The shape is maintained by a spring 10' inserted into the inner periphery of the bellows-shaped packing 5' so as not to impede gas flow.

The bellows-like packing 5' is made of a material that has at least a longer lifespan than the normally used rubber hose.
When used in durable special rubber hoses such as reinforced rubber hoses (for example, those wrapped with cloth or glass fiber), 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 or cracks, as indicated by the arrows in FIG. There is a risk that gas may leak out from the socket A' via a path such as this, which raises concerns about safety.

This invention was developed in view of the shortcomings of the conventional example of Narukami, 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 is composed of a socket body 1, a push rod 4, a bellows-shaped packing 5, an operating ring 11, and the like.

The socket main body 1 is molded from a hard synthetic resin material, etc., and has a small-diameter outflow-side cylindrical portion 1a and a large-diameter inflow-side cylindrical portion 1b. A spring receiving part 12 is provided protrudingly on the side, and a plurality of through holes 13 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 14 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 13 is larger than the diameter of the steel ball 8 fitted into the through hole 13, and the opening diameter on the inner circumferential side is smaller than the diameter of the steel ball 8.

Further, an annular sealing member 7 having elasticity is provided around the inward side of the through hole 13 on the inner circumferential surface of the inflow side cylinder portion 1b, and an annular elastic member 6 having elasticity is provided further inside.

The elastic member 6 and the seal member 7 are integrally formed with each other.

A fixing flange 15 is integrally provided at the base end of the push rod 4 at right angles to the push rod 4, and the fixing flange 15 has a plurality of openings 16 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 within the inflow side cylinder part 1b by fitting the fixing collar part 15. The tip of 4 protrudes close to the opening end surface of the inflow side cylindrical portion 1b.

The operating ring 11 is molded from a flame-retardant synthetic resin material or a metal material, and a stepped portion 17 is formed on the inner circumference of the operating ring 11, so that the front inner circumferential surface 18a of the stepped portion 17 is connected to the rear inner circumferential surface 18b. The rear inner circumferential surface 18b is brought into almost perfect contact with the outer circumferential surface of the inflow side cylinder part 1b.

A spring 19 is fitted onto the outer circumferential surface of the inlet tube portion 1b, and a steel ball 8 having a diameter larger than the thickness of the side wall of the inlet tube portion 1b is loosely fitted into the through hole 13.

The operation return 11 is fitted into the outer periphery of the inflow side cylinder part 1b,
The operating ring 11 is locked with its stepped portion 17 in contact with the protrusion 14.

The spring 19 urges the slidable operating ring 11 to protrude forward between the spring receiving portion 12 and the rear end of the operating ring 11, and is fitted into the outer periphery of the inflow-side cylindrical portion 1b.

The bellows-like packing 5 has flanges 720 at 20 b at both ends of a relatively thin body 5a, a metal ring 21 is fitted on the outer surface of the flange 20b on the tip side, and an elastic band-shaped piece is attached to the tip. A ring portion 22 is provided in a protruding manner.

The bellows-shaped packing 5, except for the metal ring 21, is integrally molded from an elastic material such as NBR.

The bellows-like packing 5 expands and contracts as the body 5a deforms, and a coil spring 9 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 23, and its distal end is free. The metal ring 21 of the packing 5 can be brought into airtight pressure contact with the elastic member 6 and the seal member 7 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 operation ring 11 protrudes from the outer circumferential surface of the cylindrical portion 1b, and when the operation ring 11 is pushed in against the spring 19, the stepped portion 17 on the inner circumference abuts against the upper surface of the above-mentioned protruding steel ball 8 and engages. be stopped.

In this state, as shown in FIG. 4, when the plug B is inserted into the socket body 1, the spherical band surface 24
is pressed against the belt-shaped ring portion 22 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 9. Then, the valve body 3 is pushed by the push rod 4. The valve body 3 is retracted and opened, and the gas flowing out from the plug B through the bypass groove 25 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 socket body 1 is inserted into the plug B, the V-shaped groove 26 provided around the outer peripheral surface of the head 2 of the plug B comes to be directly below the through hole 13 of the socket body 1.

At this time, the steel ball 8 was in contact with the bellows-shaped packing 5 on the lower surface.
The metal ring 21 on the outer periphery of the flange 20b is missing,
On the other hand, the upper surface of the steel ball 8 is pushed by the stepped portion 17 of the operating ring 11 and falls into the V-shaped groove portion 26 of the plug B.

When the steel ball 8 falls into the V-shaped groove 26 of the plug B, the operating ring 11, which was locked on the top surface of the steel ball 8, becomes free.
Pushed by the spring 19, it moves to the right so that the rear inner peripheral surface 18b of the operating ring 11 is above the steel ball 8, and the steel ball 8 is moved to the inflow side cylindrical portion 1b.
Therefore, the plug B is locked to the steel ball 8 in the V-shaped groove 26, and the socket A and the plug B are prevented from coming out naturally.

Reference numeral 10 denotes a spring that maintains the bellows-like packing 5 in a cylindrical shape so that when the bellows-like packing 5 is compressed, its body 5a deforms and collapses toward its inner circumference, thereby preventing the flow of gas from being obstructed. It is.

When the socket A and the plug B are connected, the elastic force of the compressed coil spring 9 causes the band-shaped ring portion 22 to
is brought into pressure contact with the spherical surface 24 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 20a of the bellows-shaped packing 5
is pressed against the inner wall of the inflow side cylindrical portion 1b by a washer 23 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 13 which is in airtight elastic contact with the outer periphery of the metal ring 21 at the tip and which holds the steel ball 8 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.

Further, the sealing member 7 on the inner periphery of the inflow side cylindrical portion 1b is in airtight pressure contact with the outer circumferential surface of the tip end of the head 2 of the plug B, and the steel ball 8
Since the through hole 13 holding the is located on the opening side of the sealing member 7, the sealing member 7 closes the space between the bellows-shaped packing 5 and the inner periphery of the inflow-side cylindrical portion 1b and between the bellows-shaped packing 5 and the spherical zone of the plug B. The airtight seal between the surface 24 and the surface 24 can be made double, and even if the seal by the elastic member 6 or the band-shaped ring part 22 is incomplete, the seal member 7 can prevent gas leakage. is now possible.

As described above, the present invention includes a push rod for pushing the valve body of the plug that protrudes from inside the outflow side cylindrical part of the socket body toward the open end surface of the inflow side cylindrical part, and a bellows-shaped packing that can be freely expanded and contracted on the inner periphery of the inflow side cylindrical part. In this pipe connector, an elastic member is provided around the inner circumferential surface of the inflow-side cylinder part for airtightly pressing against the outer periphery of the tip of the bellows-shaped packing, and the opening is wider than the elastic member and sealing member of the inflow-side cylinder part. Since the steel ball for connecting the plug is held on the side, when the socket and the plug are connected, the elastic member is pressed in an airtight manner between the outer circumference of the tip of the bellows-shaped packing and the inner circumference of the inflow side cylinder. Therefore, even if holes or cracks occur in the relatively thin body of the bellows-shaped packing as it undergoes repeated deformation, the bellows-like packing will pass through the holes or cracks. The gas leaking to the outer circumference of the packing is stopped by the elastic member between the outer circumference of the tip of the bellows-shaped packing and the inner circumference of the inflow-side cylindrical part, and the gas leakage does not proceed any further and the gas leaks to the outside of the socket. It is highly safe as it prevents this from happening.

In addition, a sealing member for airtightly pressing the head of the plug is provided around the inner circumferential surface of the inflow-side cylindrical part, and a steel ball for connecting the plug is held on the opening side of the sealing member of the inflow-side cylindrical part. Because of this, the sealing member can double the airtight seal between the bellows packing and the inner periphery of the inflow side cylinder part and between the bellows packing and the plug, and it is possible to create a double airtight seal between the bellows packing and the plug. Even if the seal between the tip and the plug is incomplete, gas leakage can be prevented by the sealing member, and gas leakage can be prevented multiple times, resulting in high safety.

In other words, even if the seal caused by the elastic member's pressure contact with the outer periphery of the tip of the bellows packing breaks and gas leaks, the sealing member serves to seal the gas leaking from the elastic member. As a result, even if a hole or crack occurs in the body of the bellows-shaped packing and gas flows to the outer periphery of the bellows-shaped packing and tries to leak out to the outer periphery of the socket, the elastic member first prevents the gas from leaking. Even if this seal ruptures, the sealing member will continue to prevent gas leakage, and even if gas leaks from the body of the bellows-shaped packing, the elastic member and sealing member will double the gas leakage. This prevents leakage.

Furthermore, the above-mentioned sealing member is not only a second sealing means in case gas leaks from the body of the bellows-shaped packing, but also gas leakage occurs from the pressure contact part between the head of the plug and the tip of the bellows-shaped packing. It has the advantage that it also serves to prevent gas from further leaking to the outer periphery of the socket.

Note that when the socket A and the plug B are connected, the sealing member 7 is attached to the tip of the bellows-shaped packing 5 and the head 2 of the plug B.
It may also be made to be in airtight pressure contact with both of them at the same time.

[Brief explanation of the drawing]

Figure 1 is a side view with the upper half cut away showing a conventional socket, Figure 2 is a side view with the upper half cut away when the same socket is connected to a plug, and Figure 3 is an implementation of the present invention. FIG. 4 is a side view with the upper half cut away showing an example, and FIG. 4 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... Seal member, 8...
...Steel ball, B...Plug.

Claims (1)

[Scope of utility model registration request] The socket main body is made up of the outflow side cylindrical part which becomes the gas outflow side and the inflow side cylindrical part into which the head of the plug is inserted, and pushes the valve body of the plug from inside the outflow side cylindrical part towards the open end surface of the inflow side cylindrical part. In a pipe connector having a bellows-like packing that is freely extendable and retractable on the inner periphery of an inflow-side cylindrical part, the push rod for the purpose of the pipe protrudes, and an elastic member that is brought into airtight pressure contact with the outer periphery of the tip of the bellows-like packing, and a head of the plug. A sealing member for airtight pressure contact with the tip is provided around the inner circumferential surface of the inflow-side cylindrical part, and a steel ball for plug connection is held on the opening side of the elastic member and sealing member of the inflow-side cylindrical part. Pipe fittings.