JPH088390Y2 - Pipe fittings and blind plugs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention [Field of Industrial Application] The present invention relates to a pipe joint and a blind plug structure for internally fitting a pipe or closing an open end of the pipe.

[Conventional technology]

There are two types of pipe joints used for leak testing of pipes, the so-called external fitting type that locks the outer peripheral surface of the pipe and the so-called internal fitting type that locks the inner peripheral surface of the pipe. .

However, the diameter of the external fitting type pipe joint is inevitably larger than that of the internal fitting type pipe joint.
There is a risk that the outer peripheral surface of the connected pipe will be damaged by the pressing force of the lock ball.

Therefore, there is a demand for a pipe joint that locks the inner peripheral surface of the pipe.
The pipe joint described in Japanese Patent No. 174888 is known as an example.

[Problems to be solved by the device]

However, the pipe joint described in the above publication is satisfactory in terms of high sealing performance, but there is still room for improvement in terms of connection strength with piping, and even if the invention is applied to a blind plug. A similar problem will remain.

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems, and an object thereof is to provide a pipe joint and a blind plug that have high sealing properties and high connection strength and sealing properties.

Configuration of the Invention [Means for Solving the Problems] In order to achieve the above-mentioned object, an air-driven pipe joint of the present invention has an annular shape in the front part on the outer circumference of an inner cylinder having a flow passage penetrating in the axial direction. The plug main cylinder is fitted into the main cylinder by forming a gap between the main cylinder and a plurality of tapered holes formed on the same circumference at the front of the main cylinder so that the outer diameter is smaller and the inner diameter is larger than the outer diameter. Is loosely fitted with a lock ball having a diameter larger than the inner diameter on the outer peripheral side of the tapered hole, a compressed air introduction port communicating with the gap is formed in the rear part of the main cylinder, and the rear part is formed in the gap. A seal ring is fitted on the inner and outer peripheral surfaces, and a compression coil spring elastically pushes it backward to fit a sliding ring in a slidable manner. The circulating fluid is allowed to enter, and the lock ball is provided on the outer peripheral surface of the front part of the sliding ring. A bevel is formed that supports the ball from the axial direction and presses the ball in the centrifugal direction.The slope is higher in the front direction and gradually lowers in the rear direction.In addition, the plug main cylinder has an end face on the insertion side of the connecting pipe. The problem is solved by providing a sealing means for sealing toward the front, and the structure having no flow passage in the inner cylinder is a blind plug.

In addition, a manually operated blind plug has a plurality of tapered holes formed on the same circumference at the front and having a smaller diameter on the outer peripheral side and a larger diameter on the inner peripheral side than the outer peripheral side. A slide rod is loosely fitted to the plug main cylinder body in which a first lock ball larger than the inner diameter of the outer peripheral side of the hole is loosely fitted, and the shaft center portion of an outer cylinder fixed to the rear outer peripheral surface of the plug main cylinder body. On the outer peripheral surface of the front part of the sliding rod, a slope is provided that is higher in the front direction and gradually lowers in the rear direction, and the rear part of the sliding rod can move in the centripetal direction to the rear part of the outer cylinder. A deep groove for locking the second lock ball that is loosely fitted in the groove and a shallow groove for releasing the locking of the second lock ball and allowing the sliding rod to reciprocate are adjacent to each other in the circumferential direction. A compression coil spring is formed between the outer cylinder and the sliding rod to urge the former in the front and the latter in the rear. Only, also in the outer cylinder and the second
A sleeve that presses the lock ball in the centripetal direction is slidably fitted by urging it backward with a compression coil spring, and a seal that seals the end face of the connection pipe on the insertion side at the front part of the outer cylinder. The problem is solved by providing the means toward the front, and a structure having a flow path penetrating the sliding rod is a pipe joint.

[Action]

In the invention of claim 1, when the compressed air is supplied from the compressed air inlet, the compressed air enters the rear gap partitioned by the seal ring of the sliding ring and presses the rear end surface of the sliding ring. The sliding ring slides forward in the gap against the elastic force of the compression coil spring, and the slanted surface of the sliding ring is disengaged from the lock ball, so that the ball is free in the tapered hole. Becomes

Therefore, the connecting pipe is inserted along the outer peripheral surface of the main plug cylinder, and the end face of the pipe is brought into contact with the sealing means to seal the end face.

Then, when the introduction of the compressed air is stopped and the inside of the rear gap is returned to normal pressure, the sliding ring tries to return to the original position by the elastic force of the compression coil spring. Then, the lock ball is pressed in the centrifugal direction, and the lock ball comes into pressure contact with the inner peripheral surface of the connecting pipe to complete the connection.

After that, when the fluid is caused to flow in the inner cylinder, the fluid pressure is applied toward the front surface of the slide ring, so that the lock ball is further pushed in the centrifugal direction to firmly lock the inner peripheral surface of the connecting pipe.

When the connecting pipe is removed from the pipe joint, compressed air is supplied again to retreat the sliding ring against the elastic force of the compression coil spring and weaken the locking force of the lock ball.

In the invention of claim 3, when the second lock ball is engaged with the deep groove, the first lock ball provided at the tip portion of the plug main cylinder is free in the tapered hole.

Therefore, the connecting pipe is inserted along the outer peripheral surface of the main plug cylinder, and the end face of the pipe is brought into contact with the sealing means to seal the end face.

Next, when the sleeve is manually slid in the direction of the connecting pipe and the sliding rod is pulled in the opposite direction, the pressing force of the sleeve toward the second lock ball in the centripetal direction is released, and the lock ball moves toward the connecting rod. It comes out of the deep groove and comes into engagement with the shallow groove. At this time, the sliding rod is repulsed by the compression coil spring and retracts in the main cylinder of the plug, and the inclined surface of the tip of the sliding rod presses the first lock ball in the centrifugal direction. The inner peripheral surface is firmly locked to complete the connection. When the fluid is supplied into the connecting pipe, the fluid pressure of the cross-section integral acts on the sliding rod and pushes it backward, so that the first lock ball is further pushed in the centrifugal direction to move the inner peripheral surface of the connecting pipe. Lock firmly.

When removing from the connecting pipe, pull the sliding rod in the opposite direction while manually sliding the sleeve toward the connecting pipe.
The pressing force of the first lock ball by the sliding rod is weakened.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a vertical side view of a four-half section of an air-driven pipe joint according to the present invention.

10 is a flow path 11 formed in the axial direction and a flange at the tip.
It is an inner cylinder having 12, and the outer periphery thereof has an annular gap 18 whose front end is brought into contact with the rear surface of the flange 12 and which is closed at the front.
And the plug main cylinder 20 is fitted.

On the same circumference of the front part of the plug main cylinder 20, a plurality of tapered holes 22 having a diameter slightly larger on the inner peripheral surface side than the outer peripheral surface side are formed.
Lock balls 23 each having a diameter smaller than the inner diameter of the tapered hole 22 and larger than the outer diameter of the outer surface are loosely fitted.

O-rings 31 and 32 are fitted on the inner and outer peripheral surfaces of the rear portion in the gap 18, and the lock balls 23 are engaged on the outer peripheral surface of the front portion of the balls.
A sliding ring 30 having a slant surface portion 33 that presses 23 in the centrifugal direction is high in the front direction and gradually decreases in the rear direction is slidably fitted. A compression coil spring 36 is applied between the rear part of the sliding ring 30 and the stepped portion 13 formed on the outer peripheral surface of the inner cylinder 10 at the rear position of the flange 12 to elastically urge the sliding ring 30 rearward. .

The rear end surface of the plug main cylinder is connected to the outer cylinder via the O-ring 25.
The outer cylinder 40 is fitted to the outer peripheral surface of the inner cylinder 10 via the O-ring 15, and the outer peripheral surface of the inner cylinder 10 is fitted to the outer peripheral surface of the rear end portion of the inner cylinder 10 via the O-ring 16. By connecting one end of a connection adapter 42 having an internal thread 43 on the inner peripheral surface or a male thread on the outer peripheral surface, the inner cylinder 10, the plug main cylinder 20, and the outer cylinder
40 is made integral by penetrating the flow path.

An annular space 44 whose front side is open is formed between the front surface of the outer cylinder 40 and the main plug cylinder body 20, and a Y-shaped packing 52 is fitted on the outer peripheral surface of the space 44 and is attached to the front end surface. Insert the cylindrical holder 50 with the flat seal ring 53 in the front
A compression coil spring 55 disposed between the front surface of 40 and the front surface of the 40 always elastically pushes forward and slidably fits.

The compressed air introduction port 45 opening on the outer peripheral surface of the outer cylinder 40 is mutually connected with the communication hole 46 opening on the rear end surface of the plug main cylinder 20 and in the flow space 26 formed inside the O-ring 25. It is in communication. The circulation space 26 communicates with the gap 18 via a communication hole 27 formed in the rear portion of the plug main cylinder 20 in the axial direction.

 Next, the operation of this embodiment will be described.

When compressed air is supplied from the compressed air introduction port 45, the compressed air sequentially flows through the communication hole 46, the flow space 26, and the communication hole 27 to form a gap.
Since it enters the inside of 18 and presses the rear end surface of the sliding ring 30,
Reference numeral 30 slides forward in the gap 18 against the elastic force of the compression coil spring 36. The forward movement of the sliding ring 30 releases the engagement between the slope portion 33 of the same ring and the lock ball 23,
23 becomes free in the tapered hole 22.

Therefore, the tip portion of the connecting pipe 8 is attached to the outer peripheral surface of the plug main cylinder 20.
When inserted along 21, the tip surface of the tube 8 will be the seal ring.
53, and further, the holder 50 is pressed and retracts against the compression coil spring 55, as shown in FIG.
The inner peripheral surface of the connecting tube 8 is supported by the outer peripheral surface 21 of the plug main cylinder body 20, and the holder 50 is stopped by the rear end surface of the holder 50 contacting the front surface of the outer cylinder 40, and the end surface of the connecting tube 8 is sealed by the seal ring 53. Sealed in.

Then, when the introduction of the compressed air is stopped and the pressure in the gap 18 is returned to the normal pressure, the sliding ring 30 is retracted by the elastic force of the compression coil spring 36, and the slope portion 33 thereof, as shown in FIG. Presses the lock ball 23 in the centrifugal direction, so that the ball 23 presses against the inner peripheral surface of the connecting pipe to lock the connecting pipe.

When the fluid is flown into the inner cylinder 10, the fluid pressure is applied to the front surface of the sliding ring 30 and pushes the sliding ring 30 rearward, so that the lock ball 23 is further pushed in the centrifugal direction and the connecting tube 8 is pushed. The inner peripheral surface is firmly locked by the lock ball 23.

When separating the connecting pipe 8, as in the case of the above connection,
If compressed air is supplied from the compressed air inlet 45, the connecting pipe 8
Since the engagement between the lock ball 23 and the lock ball 23 is released, the connecting pipe 8
Can be pulled out.

Next, an embodiment of the manually operated blind stopper will be described with reference to FIG.

On the same circumference of the rear end of the outer cylinder 70, a plurality of tapered holes 74 having a diameter slightly smaller on the inner peripheral surface side than on the outer peripheral surface side are formed, and the outer peripheral surface is larger than the inner peripheral surface side diameter of the tapered hole 74. The second lock balls 85 each having a diameter smaller than the side diameter are loosely fitted. Outer cylinder
On the outer peripheral surface of the rear part 70, a ball retainer 81 for restricting the movement of the second lock ball 85 in the centrifugal direction is provided on the inner peripheral surface, and a ball releasing part 82 for releasing the second lock ball 85 to release the pressure.
And a sleeve 80 which is always biased by the sleeve spring 86 toward the ball releasing portion 82 is slidably fitted. Reference numeral 87 is a retaining ring for preventing the sleeve 80 from coming out.

On the inner peripheral surface of the central portion of the outer cylinder 70, there is provided a first lock ball 23 which engages with a beveled surface portion 33 formed on the outer peripheral surface of the distal end portion of a sliding rod 60, which will be described later, similarly to the pipe joint embodiment. The plug main cylinder body 20 loosely fitted to the screw 22 is screwed through an O-ring 79, and an annular space 72 whose front side is open is formed between the screw main body and the outer cylinder 70 in front of the screwed portion. .

A Y-shaped packing 52 is fitted on the outer peripheral surface of the space 72, and a cylindrical holder 50 having a flat seal ring 53 on the front surface is fitted on the tip end surface of the outer holder 70. The coil spring 55 constantly springs forward and slidably inserts. In addition, a holder is provided on the inner peripheral surface of the tip of the outer cylinder 70.
Attach the retaining ring 57 for preventing the escape of 50.

A sliding rod 60 is slidably fitted to the axial center portions of the plug main cylinder 20 and the outer cylinder 70 via an O-ring 69, and is formed in the substantially central portion of the inner peripheral surface of the outer cylinder 70. A compression coil spring 76 is provided between the stepped portion 75 and the stepped portion 66 formed on the outer peripheral surface of the sliding rod 60 facing the stepped portion 75, and the outer cylinder 70 and the sliding rod 60 are opposed to each other. It is urged to slide in the direction of repulsion.

The second lock ball is formed on the outer peripheral surface of the rear end of the sliding rod 60.
A deep groove 64 with which 85 is engaged and disengaged, and a shallow groove 65 having a width such that the second lock ball 85 can move in the direction of the connecting pipe 8 are formed in the circumferential direction so as to be connected to this groove. The depth of shallow groove 65 is deep groove
When the second lock ball 85 is formed slightly shallower than 64 and is released by the ball release portion 82, the lock ball 85 can freely move from the deep groove 64 to the shallow groove 65.

An empty cylinder 63 is formed in the front portion of the sliding rod 60 in the axial direction to allow fluid to enter, and a handle 61 is fixed to the rear end portion with a screw 62.

68 is a distribution space 67 formed on the outer circumference of the hollow cylinder 63 and the sliding rod 60.
And 28 is a through hole that communicates with the space 72 and also communicates with the circulation space 67 when the second lock ball 85 engages with the shallow groove 65.

 Next, the operation of this embodiment will be described.

As shown in FIG. 4, when the second lock ball 85 is engaged with the deep groove 64, the first lock ball 23 provided at the tip of the plug main cylinder 20 is free in the tapered hole 22. .

Therefore, the tip portion of the connecting pipe 8 is attached to the outer peripheral surface of the plug main cylinder 20.
When inserted along 21, similar to the embodiment of the pipe fitting,
The inner peripheral surface of the connecting tube 8 is supported by the outer peripheral surface 21 of the main plug cylinder 20, and the end surface of the connecting tube 8 is sealed.

Then, the sleeve 80 is slid in the direction of the connecting pipe 8 against the elastic force of the sleeve spring 86, and the sliding rod 60 is pulled in the opposite direction. Release to the second lock ball
85 disengages from the deep groove 64 of the sliding rod 60, and the shallow groove 65 and sleeve 80
Engages with the ball releasing portion 82 of.

At this time, as shown in FIG. 5, due to the elastic force of the compression coil spring 76, the sliding rod 60 and the outer cylinder 70 slide in the direction in which they separate from each other, and the sliding rod 60 moves inside the main plug barrel body 20. As the slope portion 33 moves backward and presses the first lock ball 23 in the centrifugal direction, the lock ball 23 presses the inner peripheral surface of the connecting pipe 8 to complete the connection. When the fluid is supplied into the connecting pipe 8, the fluid pressure of the cross-section integral of the sliding rod 60 acts on the sliding rod 60,
Since 60 is pushed backward (in the direction away from the connecting pipe 8),
The first lock ball 23 is further pushed in the centrifugal direction, and the inner peripheral surface of the connecting pipe 8 is firmly locked by the lock ball 23.

When the second lock ball 85 is engaged with the shallow groove 65,
Due to the elastic force of the compression coil spring 76, the lock ball
Since 23 is constantly in pressure contact with the inner peripheral surface of the connecting pipe 8, the connection is strong and the engagement between the second lock ball 85 and the shallow groove 65 is not accidentally disengaged.

In this state, the distribution space 67 of the sliding rod 60 and the main plug cylinder
Since the through holes 28 of 20 communicate with each other, the pressure of the fluid supplied into the connecting pipe 8 passes through the empty cylinder 63 and the through holes 68, 28, etc.
The seal ring 53 provided on the back surface of the holder 50 and provided on the front surface of the holder 50 is more firmly pressed against the open end surface of the connection pipe.

When removing the connecting pipe 8, the sliding rod 60 is slid toward the connecting pipe 8 against the elastic force of the compression coil spring 76. At this time, the second lock ball 85 slides on the shallow groove 65,
Since the sleeve 80 retracts due to the elastic force of the sleeve spring 86, the second lock ball 85 has the deep groove 64 and the ball retainer.
It engages with 81. In this state, the first rock ball
Since 23 is released and does not press the inner peripheral surface of the connecting pipe 8, the connecting pipe 8 can be pulled out.

Effect of the Invention The pipe joint and the blind plug of the present invention have a structure in which the lock ball is constantly in pressure contact with the inner peripheral surface of the connecting pipe due to the action of the compression coil spring and the inclined surface portion in the inserted state of the connecting pipe. It is extremely large, and the sealing effect on the open end face of the connecting pipe is also large due to the reaction of the pressing action by the sloped part, so the fluid leakage prevention effect is great, and it is an excellent effect as an internal fitting type pipe joint and as a blind plug. Exert.

In particular, since the pressure of the fluid flowing in the connecting pipe is directly applied to the inclined surface portion, the higher the fluid pressure, the stronger the lock.

[Brief description of drawings]

1 to 3 show an embodiment of an air driven pipe joint according to the present invention. FIG. 1 is a side view of a longitudinal section of a four-half section showing a state of separation from a connecting pipe, and FIG. 4 half longitudinal side view showing the state before connection, FIG. 3 is a vertical half side view showing the complete connection with the connecting pipe, and FIGS. 4 and 5 are manually operated blind stoppers according to the present invention. FIG. 4 is a vertical half side view showing a state of separation from the connecting pipe, and FIG. 5 is a vertical half side view showing a state of complete connection with the connecting pipe. . 10 …… Inner cylinder, 18 …… Gap, 20 …… Plug main cylinder 23 …… Lock ball (1st lock ball) 30 …… Sliding ring, 33 …… Slope 36,76 …… Compression coil spring 40 , 70 …… Outer cylinder, 45 …… Compressed air inlet 53 …… Seal ring, 60 …… Sliding rod 64 …… Deep groove, 65 …… Shallow groove 80 …… Sleeve, 85 …… Second lock ball

Claims (4)

[Scope of utility model registration request] 1. A plug main cylinder is fitted to an outer circumference of an inner cylinder having a flow passage extending in the axial direction with an annular gap formed at the front, and the same circumference of the front part of the main cylinder. A lock ball having a diameter larger than the inner diameter of the outer peripheral side of the tapered hole is loosely fitted into a plurality of tapered holes formed on the upper side with a smaller diameter on the outer peripheral side and with a larger diameter on the inner peripheral side than the outer peripheral side. A compressed air introduction port communicating with the gap is formed in the rear part, and a seal ring is fitted to the inner and outer peripheral surfaces of the rear part in the gap, and the compression coil spring repels the seal ring rearward so that the sliding ring Is slidably fitted so that the fluid flowing through the flow path of the inner cylinder can enter the gap in front of the seal ring, and the lock ball is provided on the outer peripheral surface of the front part of the slide ring. The ball is supported from the centripetal direction and pushes the ball in the centrifugal direction.The front direction is high, and the lower it is toward the rear direction. The slant portion made by forming, further, the plug main cylindrical body, a pipe joint, wherein a sealing means for sealing the insertion side end face of the connecting tube is provided toward the front. 2. The blind plug according to claim 1, which has no passage through the inner cylinder. 3. A plurality of tapered holes, each having a smaller diameter on the outer peripheral side and a larger diameter on the inner peripheral side than the outer peripheral side, are formed on the same circumference at the front part, and the inner diameter of the tapered holes is the outer peripheral side inner diameter of the tapered hole. A plug main cylinder into which a larger first lock ball is loosely fitted and a shaft of an outer cylinder fixed to the outer peripheral surface of the rear part of the plug main cylinder. The outer peripheral surface portion is provided with a slope portion that is higher in the front direction and gradually lowers in the rear direction, and the rear portion of the sliding rod is loosely fitted to the rear portion of the outer cylinder so as to be movable in the centripetal direction. 2 a deep groove for locking the lock ball and a shallow groove for releasing the lock of the second lock ball and enabling the sliding rod to reciprocate are formed adjacent to each other in the circumferential direction, and A compression coil spring is provided between the outer cylinder and the sliding rod to urge the former toward the front and the latter toward the rear. A sleeve that presses the second lock ball in the centripetal direction is urged rearward by a compression coil spring to be slidably fitted to the outer cylinder, and a connecting pipe of A blind plug characterized in that a sealing means for sealing the end face on the insertion side is provided forward. 4. A pipe joint according to claim 3, wherein the sliding rod has a channel penetrating in the axial direction, and a screw for connecting to a device to be connected is formed at the rear portion of the sliding rod. .