JPS5934788Y2 - pipe fittings - Google Patents

Description

[Detailed description of the invention] This invention relates to a gas leakage prevention structure for a pipe connection socket.
The gist of this is that the socket main body 1 is constructed from the outflow side cylindrical part 1a, which is the gas outflow side, and the inflow side cylindrical part 1b, into which the head 2 of the plug B is inserted, and The holding cylinder 3 is extended into the inflow side cylinder part (1b) from near the part, and a push rod 5 for pushing the valve body 4 of the plug B and a gas inflow opening 6 are provided at the tip of the holding cylinder 3, and the outer periphery of the holding cylinder 3 and A bellows-shaped packing 7 that can be expanded and contracted is fitted between the inner periphery of the inlet cylinder part 1b, and a sliding ring 8 is inserted between the outer periphery of the holding cylinder 3 and the inner periphery of the bellows-shaped packing 7, and is slid by a spring 9. an airtight packing 11 for biasing the sliding ring 8 to protrude and press an elastic ring 10 provided on the inner circumferential surface of the sliding ring 8 to the outer circumferential surface of the holding cylinder 3 in an airtight manner and to press the tip of the plug B in an airtight manner; is provided at the tip of the sliding ring 8, and a plug B is provided at the tip of the inflow side cylindrical portion 1b.
This relates to a pipe connector that holds a steel ball for connection.

In the conventional socket, as shown in FIG.
Several gas flow openings 6' are provided near the base of the push rod 5', protruding from the boundary between the inflow side cylinder part 1b' and the inflow side cylinder part 1b', and protrude from the boundary between the inflow side cylinder part 1b' and the inflow side cylinder part 1b'. '
A bellows-shaped hack 7' made of rubber is fitted into the inner periphery of the bellows-shaped packing 7', and a coil spring 13' on the outer periphery of the bellows-shaped packing 7' urges the expansion of the bellows-shaped packing 7', and the bellows-shaped packing 7' is compressed. In order to prevent a portion of the body 7a' from collapsing inward and impeding gas flow, the shape is maintained by a spring a' inserted into the inner periphery of the bellows-shaped packing 7'.

Therefore, a shape-retaining spring a' was always necessary.

In addition, the bellows-like packing 7' is made of a material with a longer lifespan than that of a commonly used rubber hose. When used in special rubber hoses, even higher performance is required.

That is, if the relatively thin body 7a' undergoes repeated deformation as the bellows-like packing 7' expands and contracts, it deteriorates or ages, and holes or cracks occur.
There is a risk of gas leaking from the socket A' to the outside through the path shown by the arrow in FIG. 2, 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 connection odor that does not leak, has excellent safety, and does not require a spring for maintaining the shape of a bellows-like packing.

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

As shown in FIG. 3, the socket A includes a socket body 1, a holding cylinder 3, a sliding ring 8, a bellows-shaped packing 7, and an operating ring 1.
It is composed of 4th grade.

The socket main body 1 is molded from a hard synthetic resin material, etc., and is hollowed out from a small-diameter outflow-side cylinder part 1a and a large-diameter inflow-side cylinder part 1b, and is located at the rear of the outer peripheral surface of the inflow-side cylinder part 1b (closer to the outflow-side cylinder part). A spring receiving part 15 is provided protrudingly on the inflow side cylinder part 1b, and a plurality of through holes 16 are bored in the side wall of the inflow side cylinder part 1b at the front part of the inflow side cylinder part 1b (opening side of the inflow side cylinder part 1b). A projecting edge 17 is provided on the outer circumferential surface of the front end of the inflow side cylindrical portion 1b.

The diameter of the opening on the outer circumferential side of the inflow side cylinder portion 1b of the through hole 16 is larger than the diameter of the steel ball 12 fitted into the through hole 16, and the opening diameter on the inner circumferential side is smaller than the diameter of the steel ball 12.

The holding cylinder 3 has a substantially cylindrical shape, and a fixing collar 18 is provided at the base end of the holding cylinder 3, and the tip of the holding cylinder 3 is narrowed to a slightly smaller diameter to form a small diameter part 3a. A plurality of gas inflow openings 6 are opened at the tip, and a push rod 5 is made to protrude from the center.

This holding cylinder 3 is fitted concentrically into the inflow side cylinder part 1b, and is fixed by fitting the fixing collar part 18 to the inner wall of the inflow side cylinder part 1b via an O-ring 19. Tube 3
A gap 20 is provided between the outer circumferential surface and the inner circumferential surface of the inflow side cylindrical portion 1b, and the push rod 5 is made to protrude near the open end surface of the inflow side cylindrical portion 1b.

Of course, the socket body 1 and the holding cylinder 3 may be integrally molded.

The operating ring 14 is molded from a flame-retardant synthetic resin material or metal material, and a stepped portion 21 is formed on the inner periphery of the operating ring 14, so that the front inner circumferential surface 14b of the stepped portion 21 is connected to the rear inner circumferential surface 14a. The rear inner circumferential surface 14a is made to be in substantially perfect contact with the outer circumferential surface of the inflow side cylindrical portion 1b.

Then, the spring 22 is extrapolated onto the outer circumferential surface of the inflow side cylindrical portion 1b,
A steel ball 12 having a diameter larger than the thickness of the side wall of the inlet cylinder portion 1b is loosely fitted into the through hole 16.

The operating ring 14 is fitted onto the outer periphery of the inflow side cylinder portion 1b,
The operating ring 14 is locked with its stepped portion 21 in contact with the protrusion 17.

The spring 22 urges the slidable operating ring 14 to protrude forward between the spring receiving portion 15 and the rear end of the operating ring 14, and is fitted into the outer periphery of the inflow side cylinder portion 1b.

The bellows-like packing 7 has flanges 23a and 23b at both ends of a relatively thin body 7a, and a metal ring 24 is fitted on the outer surface of the flange 23b on the tip side, and an elastic band-shaped ring is attached to the tip. The portion 26 is provided in a protruding manner.

The bellows-shaped packing 7, except for the metal ring 24, is integrally molded from an elastic material such as NBR.

The bellows-like packing 7 expands and contracts as the body 7a deforms, and a coil spring 13 is inserted around the outer periphery of the body 7a to force the bellows-like packing 7 to expand.

This bellows-shaped packing 7 is fitted into the gap 20, and its proximal end is fixed to the bottom of the gap 20 with a washer 25, while its distal end is free.

The sliding ring 8 has a substantially U-shaped cross section with an annular groove 27 on its inner peripheral surface, and its inner diameter is approximately equal to the outer diameter of the small diameter portion 3a of the holding cylinder 3. An annular elastic ring 10 having elasticity is delivered, and an annular airtight packing 11 is attached to the tip.

The sliding ring 8 is slidably inserted on the outer periphery of the small diameter portion 3a between the inner periphery of the bellows-shaped packing 7 and the outer periphery of the holding cylinder 3, and the elastic ring 10 is inserted between the inner periphery of the bellows-shaped packing 7 and the outer periphery of the holding cylinder 3. It is compressed and is brought into airtight pressure contact with the groove 27 and the outer circumferential surface of the holding cylinder 3, and is biased to protrude toward the opening side by a spring 9 inserted on the outer circumference of the small diameter portion 3a, and a locking portion protrudes from the outer circumference of the tip of the small diameter portion 3a. The protrusion 28 prevents removal.

When the plug B is inserted into the socket main body 1, the spherical band surface 29 at the tip of the plug B comes into contact with the band-shaped ring portion 26 of the bellows-shaped packing 7.
Then, the sliding ring 8 is pressed against the airtight packing 11, and the bellows-shaped packing 7 is compressed against the elastic force of the coil spring 13 and the spring 9, and the plug B is moved back into the socket body 1 while the sliding ring 8 is retreated. When the valve body 4 is press-fitted, the push rod 5 causes the valve body 4 to retreat, opening the bottom of the valve body 4.
The gas flowing out from the plug B through the bypass groove 30 advects into the holding cylinder 3 through the gas inflow opening 6, and further flows out into the hose through the inside of the outflow side cylinder part 1a.

When the bellows-shaped packing 7 is further compressed and the plug B is inserted into the socket I/main body 1, the V-shaped groove 31 provided around the outer peripheral surface of the head 2 of the plug B comes to be directly below the through hole 16 of the socket main body 1. .

At this time, the metal ring 24 on the outer periphery of the flange 23b of the bellows-shaped gasket 7 that was in contact with the lower surface of the steel ball 12 is gone, and on the other hand, the upper surface of the steel ball 12 is pushed by the step 21 of the operating ring 14, so the plug B is closed. It falls into the V-shaped groove 31.

When the steel ball 12 falls into the V-shaped groove 31 of the plug B, the operating ring 14 that was locked on the top surface of the steel ball 12 becomes free, moves to the right under the pressure of the spring 22, and the operating ring 14 The left side of the stepped portion 21 is placed above the steel ball 12 to prevent the steel ball 12 from protruding to the outer circumferential surface of the inflow side cylindrical portion 1b. Then, socket A and plug B will not come out naturally.

Here, even if the bellows-like packing 7 is compressed and deformed, the body 7a is only pressed against the outer periphery of the holding cylinder 3 and the sliding ring 8, and the gas flow is not obstructed.

When the socket A and the plug B are connected, the elastic force of the compressed coil spring 13 causes the band-shaped ring portion 2 to
6 is brought into pressure contact with the spherical surface 29 of the plug B to maintain airtightness between the tip of the bellows-shaped packing 7 and the tip of the plug B, and the flange 23 of the bellows-shaped packing 7
A is pressed against the bottom of the gap 20 by a washer 25 to keep the base end of the bellows-shaped packing 7 airtight and prevent gas from leaking out of the bellows-shaped packing 7.

Furthermore, since the airtight packing 11 provided at the tip of the sliding ring 8 is pressed against the tip of the spherical surface 29, gas does not leak from between the sliding ring 8 and the tip of the plug B toward the bellows packing 7. , since the elastic ring 10 delivered into the groove 27 of the sliding ring 8 is pressed against the outer periphery of the holding cylinder 3 in an airtight manner,
A bellows-shaped packing 7 is inserted between the sliding ring 8 and the holding cylinder 3.
Since a hole such as the gas inflow opening 6 is made only at the tip of the holding cylinder 3 so that the gas can flow through the inside of the holding cylinder 3 without leaking towards the inside of the holding cylinder 3. The gas flowing through the opening does not leak through the holding cylinder 3 to the inner peripheral surface of the bellows-shaped packing 7, and the body 7 of the bellows-shaped packing 7
Gas is never allowed to flow between the inner circumferential surface a and the outer circumferential surface of the holding cylinder 3, so the bellows-like packing 7 is repeatedly expanded and contracted to deform the relatively thin body portion 7a many times. Even if holes or cracks should occur in the body 7a during operation, gas will not leak to the outside of the socket A.

Conversely, in order to disconnect socket A and plug B that are connected to each other, hold the operating ring 14 and pull it to the left from the state shown in FIG. ,
Since there is no longer anything holding down the upper surface of the steel ball 12, the plug B is pushed out by the force of the bellows-shaped packing 7 and the coil spring 13 inserted on its outer periphery, and the steel ball 12 is pushed out from the flange 23b of the bellows-shaped packing 7. Since the operating ring 14 is pushed up to the outer circumferential surface and its upper surface protrudes above the outer circumferential surface of the inflow-side cylinder portion 1b, the stepped portion 21 of the operating ring 14 that is manually pulled in comes into contact with the upper surface of the steel ball 12 again. When the plug B is locked and returned to the state shown in FIG. 3, the valve body 4 of the plug B separates from the push rod 5 and closes the plug B.

As described above, the present invention extends the holding cylinder from near the end of the outflow side cylinder part into the inflow side cylinder part, provides an opening for gas inflow at the tip of the holding cylinder, and creates a gap between the outer periphery of the holding cylinder and the inner periphery of the inflow side cylinder part. A bellows-shaped packing that can be expanded and contracted is fitted into the cylinder, a sliding ring is inserted between the outer periphery of the holding cylinder and the inner periphery of the bellows-shaped packing, and the sliding ring is biased to protrude by a spring. An airtight packing is provided at the tip of the sliding ring to press the provided elastic ring against the outer peripheral surface of the holding cylinder in an airtight manner and to press the tip of the plug in an airtight manner, so when the socket and plug are connected, the elastic ring The ring prevents gas from leaking from between the sliding ring and the retaining cylinder toward the bellows-shaped packing, and the airtight packing that presses against the tip of the plug prevents gas from leaking between the sliding ring and the plug tip toward the bellows-shaped packing. The gas is prevented from leaking into the cylinder, and the gas is separated from the bellows-like packing by allowing it to flow inside the holding cylinder, so even if a hole or crack occurs in the bellows-like packing, there will be no leakage. There is no need to worry about gas leaking from the socket to the outside of the socket, which has the advantage of being excellent and highly safe.

Furthermore, since the bellows-shaped packing is held in shape by a holding cylinder and a sliding ring, the bellows-shaped packing is guarded from the inner periphery, and when the bellows-shaped packing is compressed, it collapses toward the inner periphery and obstructs the flow of gas. There is no need for a special shape-retaining spring for the bellows-like packing, which has the advantage of reducing the number of parts and facilitating assembly.

[Brief explanation of the drawing]

Fig. 1 is a side view with the upper part cut away showing a conventional socket, Fig. 2 is a side view with the upper half cut away when the same socket is connected to a plug, and Fig. 3 is 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, and FIG. 5 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...Plug head, 3...Bend Holding cylinder, 4...Plug valve body, 5...Curved push rod, 6...Gas inflow opening,
7... Bellow-shaped packing, 8... Sliding ring, 9... Spring, 1o... Bent elastic ring, 11... Airtight packing, 12.・Curved steel ball, B...Plug.

Claims (1)

[Scope of utility model registration request] A socket main body is constituted by an outflow side cylindrical part serving as a gas outflow side and an inflow side cylindrical part into which the head of the plug is inserted, and a holding cylinder extends from near the end of the outflow side cylindrical part into the inflow side cylindrical part, A push rod for pushing the valve body of the plug and an opening for gas inflow are provided at the tip of the holding cylinder, and a bellows-like packing that can be freely expanded and contracted is fitted between the outer periphery of the holding cylinder and the inner periphery of the inflow side cylinder. A sliding ring is inserted between the inner periphery of the bellows-shaped packing, the spring urges the sliding ring to protrude, and the elastic ring provided on the inner periphery of the sliding ring is hermetically pressed against the outer periphery of the holding cylinder. A pipe connector that has an airtight gasket at the tip of the sliding ring for airtight pressure contact with the tip of the plug, and holds a steel ball for connecting the plug at the tip of the cylinder on the inflow side.