JP3380714B2 - Pipe fittings - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint used when supplying a high pressure fluid composed of gas or liquid to a cylinder or the like.

[0002]

2. Description of the Related Art Conventionally, in this type of pipe joint, as shown in FIG.
As shown in FIG. 6, the joint main cylindrical body 41 having the fluid passage 49, the rear end side slidably fitted inside the front end side of the joint main cylindrical body 41, and the packing 42 through the connected pipe body. The cylindrical packing holder 43 that comes into contact with the joint main cylinder 41 and the collar portion 44 formed at the tip of the main joint cylinder body 41 are rotatably supported in the centrifuge direction in the middle thereof and are opened and closed by pivoting in the centrifuge direction. Then, a plurality of chuck pieces 45 for sandwiching the connected pipe body that abuts the packing holder 43 are fitted to the outer periphery of the joint main tubular body 41 on the tip end side, and the chuck piece 45 is advanced to move the inner surface of the chuck piece 45. Operation sleeve 46 that pushes in the centripetal direction with and locks in the closed state
And an eccentric cam 47 for advancing and retracting the operating sleeve 46, and a cam operation and safety loop for rotating the eccentric cam 47 and surrounding a cylinder or the like having a pipe to be connected when the pipe is connected to the pipe to be connected. A body 48 is known.

[0003]

However, according to the above-mentioned conventional pipe joint, at the time of connection with the pipe to be connected, the tip of the packing holder 45 of the pipe joint is pushed to the end of the pipe to be connected by one hand. It is necessary to perform an operation with both hands, such as tilting the cam operation / safety loop body 48 with the other hand while hitting, and the connecting work is troublesome.

When a force is applied to the operation / safety loop body 48 in the tilted state due to some factor at the time of connection and the operation / safety loop body 48 stands up, the eccentric cam 47 rotates. Along with this, the operation sleeve 46 retracts and unlocks the chuck piece 45 in the closed state, whereby the connected pipe body is released from being held by the chuck piece 45. As a result, the pipe joint vigorously comes off from the pipe body to be connected due to the internal pressure, so that there is a problem in that the handling of the pipe pipe joint must be carefully performed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe joint that facilitates connection work and can reliably maintain a connected state and has high safety.

[0006]

A pipe joint according to claim 1, wherein :
Is a cylindrical main body having a fluid passage therein, and a cylindrical main body that slidably fits the rear end inside the main end of the main joint and abuts the distal end of the connected pipe via packing. Connected to the packing holder and a collar part formed at the tip of the main joint barrel so that it can rotate freely in the centrifuge direction in the middle of the joint, and rotates and opens and closes in the centrifuge direction to contact the packing holder. A plurality of chuck pieces that sandwich the tubular body are slidably fitted to the outer circumference of the distal end side of the joint main cylinder body, and are moved forward to press the chuck pieces in the centripetal direction on their inner circumferential surfaces to close them. An operating sleeve to be locked, and a lock sleeve that is fitted to the outer periphery of the joint main cylinder at the rear end side and is moved forward by receiving fluid pressure in the joint main cylinder to prevent the operation sleeve that has advanced from retracting. In the chuck piece, the inner surface of the chuck piece projects from the tip of the joint main cylinder. Abutting contact piece is provided on the outer circumferential surface of Tsu Kin holder, also In the packing holder,
A large diameter part that pushes up the contact piece when the packing holder moves forward and rotates the chuck piece in the centrifugal direction on the outer periphery of the packing holder, and releases the push-up of the contact piece when retracted to rotate the chuck piece in the centripetal direction. A small diameter portion is formed to enable the operation sleeve, and in the operation sleeve, when the chuck piece is in the open state, it is locked to the outer peripheral surface of the operation sleeve to prevent the advance, and when the chuck piece is in the closed state, the advance is made. In addition, a space is formed between the lock sleeve and the joint main cylinder, and the joint main cylinder has a through hole for communicating the space with the fluid passage in the joint main cylinder. Springs are elastically interposed between the joint main cylinder and the packing holder and between the operation sleeve and the lock sleeve .
The operating sleeve is in the forward position and is connected to the connected pipe.
When pressure fluid is supplied through the fluid passage of the main cylinder,
Provided to prevent the operating sleeve from moving backward.
It is characterized by being.

According to this structure, when the operation sleeve is retracted against the elastic force of the spring to release the pressing force on the chuck piece in the centripetal direction, the packing holder advances due to the bias of the spring, and the packing holder moves forward. The contact piece provided on the inner surface of the chuck piece rides on the large-diameter portion of the packing holder by the forward movement of the chuck piece, whereby the chuck piece rotates in the centrifugal direction with the flange portion formed at the tip of the main joint cylinder as the fulcrum. Then, when the operating sleeve is released in this state, the operating sleeve is elastically locked to the outer peripheral surface of the chuck piece in the state where the contact piece rides on the large diameter portion of the packing holder and is rotated in the centrifugal direction. And the forward movement is blocked. This state is the connection standby state of the pipe to be connected.

When connecting the pipes to be connected, the tip of the packing holder is pressed against the tip of the pipe to be connected from the above state, and the packing holder is retracted against the elastic force of the spring. When the contact piece of the chuck piece that was in contact with the large diameter portion of the packing holder slides on the same portion and reaches the small diameter portion, the contact piece is released from being pushed up by the large diameter portion and moves in the centripetal direction of the chuck piece. The chuck piece is rotatable, and the chuck piece is pushed by the operation sleeve elastically locked to the outer peripheral surface of the chuck piece to rotate in the centripetal direction and is in contact with the tip of the packing holder. Sandwich. Chuck piece is centripetal
By rotating in the direction
Move forward due to the elastic force of the
Lock the chuck piece that has been rotated to the closed state. By this
Therefore, the pipes to be connected are securely connected. Connected
By the way, when high-pressure fluid is passed through the fluid passage,
The joint main cylinder and the lock sleeve go through the formed through hole.
High-pressure fluid flows into the space formed between the
The lock sleeve moves forward under the pressure of fluid,
Abut the rear end of the operating sleeve in the position
Prevent the retreat of Bu.

A pipe joint according to a second aspect is the pipe joint according to the first aspect.
The above-mentioned lock sleeve connects the pipe joint to the pipe to be connected.
When the operating sleeve moves forward,
Make sure that the outer peripheral surface greatly projects from the rear end of the operating sleeve.
Is provided and locks when the lock sleeve is advanced
The outer peripheral surface of the sleeve is smaller than the rear end of the operating sleeve.
It is characterized in that it is provided so as to project.

The pipe joint according to claim 3 is the same as that according to claim 1.
The lock sleeve is mounted on the spring
Installed at the rear of the joint main cylinder when retracted by
The end face of the large diameter outer peripheral part and the rear end face of the lock sleeve are
It is characterized in that they are provided at almost the same position
It

[0011]

1 to 4 show one example of an embodiment of a pipe joint according to the present invention.

In the drawings, 1 is a main joint cylinder having a fluid passage 2 inside, 3 is a rear end of the main joint cylinder 1,
The internal passage 4 is an adapter that communicates with the fluid passage 2 and is connected to a supply source of high-pressure fluid. Reference numeral 5 denotes a tubular packing holder in which the rear end side is slidably fitted inside the leading end side of the joint main tubular body 1, and a packing 7 that abuts against the connected pipe body 6 is provided at the leading end thereof. .

A circumferential groove 8 having a predetermined width in the axial direction is formed on the outer periphery of the packing holder 5 on the rear end side, and a tip of a screw 9 provided on the joint main cylinder 1 is formed on the circumference. It is engaged with the groove 8 and the packing holder 5 has a circumferential groove 8
It is slidable in the front-back direction within the range of the axial width. Reference numeral 10 denotes a coil spring that biases the packing holder 5 in the distal direction, and is elastically interposed between the packing holder 5 and the joint main cylinder 1. Reference numeral 11 denotes a seal ring that seals between the inner peripheral surface of the joint main cylinder 1 and the outer peripheral surface of the packing holder 5.

Reference numeral 12 denotes a packing portion 5 which is supported by a collar portion 13 formed at the tip of the main joint cylinder body 1 so as to be rotatable in the centrifuging direction in the middle thereof and pivoted in the centrifuging direction to open and close. Is a plurality of chuck pieces (six pieces are used in the present embodiment) for sandwiching the connected pipe body 6 that abuts on the tip of the chuck piece. The chuck piece 12 has an engaging portion 16 having an internal thread portion 15 that engages with the external thread portion 14 of the pipe body 6 to be connected on the inner surface of the front portion, and a locking recess 17 for locking the collar portion 13 on the inner surface in the middle. Is formed, and each chuck piece 12 is rotatable in the centrifuging direction with the collar portion 13 as a fulcrum.

Reference numeral 18 denotes a spring band wound around the outer periphery of the rear end of each chuck piece 12,
The rear end portion of each chuck piece 12 is biased in the centripetal direction by the contracting force of the spring band 18 so that the front end side having the occlusal portion 16 opens in the centrifugal direction with the collar portion 13 as a fulcrum. The spring band 18 is formed by forming a coil spring in an annular shape.

Further, an abutting piece 19 slidably abutting the outer peripheral surface of the packing holder 5 projecting from the tip of the joint main tubular body 1 behind the occlusal portion 16 on the inner surface on the front end side of the chuck piece 12. Is provided. When the packing holder 5 advances, the contact piece 19 is pushed up to the outer periphery of the packing holder 5 with which the contact piece 19 abuts.
A large-diameter portion 20 for rotating the second occlusal portion 16 in the centrifugal direction,
A small-diameter portion 21 is formed to release the push-up of the contact piece 19 at the time of retreat and enable the occlusal portion 16 of the chuck piece 12 to rotate in the centripetal direction.

Numeral 22 is slidably fitted to the outer circumference of the joint main cylinder 1 at the tip end side, and is moved forward to press the chuck piece 12 in the centripetal direction on its inner peripheral surface to lock it in the closed state, and to retract it. Then, the operation sleeve releases the pressure. An annular locking projection 23 is formed on the inner peripheral surface of the operation sleeve 22, and when the engaging portion 16 of the chuck piece 12 is in an open state, the locking projection 23 is formed on the outer peripheral surface thereof. When the operation sleeve 22 is locked to prevent the operation sleeve 22 from advancing, and the engaging portion 16 of the chuck piece 12 is in a closed state, the engaging protrusion 23 is released from the engagement of the outer peripheral surface of the chuck piece 12 and can be advanced. Has become.

A pressing projection 24 is formed at the tip of the operating sleeve 22 so as to project inward, and the engaging portion 16 of the chuck piece 12 is in a closed state.
Is moved forward and reaches the forward position, the pressing projection 24 presses the outer periphery of the tip end portion of the chuck piece 12 in the closed state in the centripetal direction to lock the chuck piece 12 in the closed state.

Reference numeral 25 is a coil spring for urging the operating sleeve 22 in the forward direction, which is elastically interposed between the operating sleeve 22 and a lock sleeve described below. A lock sleeve 26 is slidably fitted to the outer periphery of the joint main cylinder 1 at the rear end side thereof, and is advanced by receiving the fluid pressure in the main joint cylinder 1 to prevent the operation sleeve 22 from moving backward. Is. The inside of the lock sleeve 26 has a small diameter inner peripheral portion 27 on the front end side, a large diameter inner peripheral portion 28 on the rear end side, and a medium diameter inner peripheral portion 29 between the small diameter inner peripheral portion 27 and the large diameter inner peripheral portion 28.
Has become.

On the other hand, on the outer periphery of the joint main cylinder 1 into which the lock sleeve 26 is fitted, a small-diameter outer peripheral portion 30 into which the small-diameter inner peripheral portion 27 is slidably fitted and a large-diameter inner peripheral portion 28 slide. The large-diameter outer peripheral portion 31 is movably fitted. The small-diameter outer peripheral portion 30 and the large-diameter outer peripheral portion 31 are formed by a cylindrical member 32 which is a separate member in view of workability and the like. The cylindrical member 32 is integrally fixed by a stop ring 33 fixed to the outer peripheral surface of the joint main cylindrical body 1.

The lock sleeve 26 fitted to the outer periphery of the rear end side of the main joint cylinder 1 advances and its tip end abuts against the rear end of the operating sleeve 22, and retreats to form the inside thereof. The step portion of the radially inner peripheral portion 29 is the tubular member 32 of the joint main tubular body 1.
The large-diameter outer peripheral portion 31 is formed in contact with the step portion of the large-diameter outer peripheral portion 31.
When in contact with the stepped portion, the space portion 34 is formed between the medium diameter inner peripheral portion 29 and the small diameter outer peripheral portion 30 formed on the tubular member 32 of the joint main tubular body 1. There is. Furthermore, before
The lock sleeve 26 connects the pipe joint to the connected pipe body 6.
When the operation sleeve 22 moves forward,
The outer peripheral surface of the sleeve 26 largely projects from the rear end of the operation sleeve 22.
The lock sleeve 26 is provided so as to move forward.
The outer peripheral surface of the lock sleeve 26 will be
Provided so as to project slightly from the rear end of the probe 22.
In addition, the lock sleeve 26 is
When retracted by the elastic force of the pulling 25, the joint
The end surface of the large-diameter outer peripheral portion 31 provided at the rear of the main cylinder 1 and the roller
So that the rear end face of the back sleeve 26 is almost at the same position
It is provided in.

A space 3 is formed on the inner peripheral surface of the lock sleeve 26.
In order to seal 4, the seal ring 36 that seals between the small diameter inner peripheral portion 27 and the small diameter outer peripheral portion 30 and the seal ring 37 that seals between the large diameter inner peripheral portion 28 and the large diameter outer peripheral portion 31. And are provided. The joint main cylinder 1 and the cylinder member 32 are formed with a through hole 35 that communicates the space 34 with the fluid passage 2 in the joint main cylinder 1.

Seal rings 38 and 39 are provided on the outer peripheral surface of the joint main cylinder 1 at positions sandwiching the through hole 35 formed in the main cylinder 1 and the cylindrical member 32. 40 is a safety loop body.

A pipe joint constructed as described above, comprising:
When connecting to the connected pipe body 6, the operation sleeve 22 is moved backward against the elastic force of the coil spring 25. By retreating the operation sleeve 22, the chuck piece 12 released from the pressing force in the centripetal direction can be opened, and the chuck piece 1 can be opened.
2. Pushing up the contact piece 19 of the chuck piece 12 by the large-diameter portion 20 on the outer circumference of the packing holder 5 which is advanced by the elastic force of the coil spring 10 together with the contracting force of the spring band 18 wound around the outer circumference of the rear end portion. As a result, in the chuck piece 12, the occlusal portion 16 pivotally opens in the centrifugal direction with the collar portion 13 formed at the tip of the joint main cylinder 1 as a fulcrum, and the large diameter portion 2
It is held in an open state by being supported by the contact piece 19 that contacts 0. The operating sleeve 22 retracted from this state
When released, the operating sleeve 22 moves the coil spring 2
5 is urged in the forward direction by the elastic force of 5, but the locking projection 23 formed on the inner peripheral surface of the operating sleeve 22 which is about to move forward is elastically attached to the outer peripheral surface of the chuck piece 12 in the opened state. engaged sealed in advance is blocked in voluntarily, operating sleeve 22及
And the lock sleeve 26 are both in the retracted position. This state is the connection standby state (FIG. 2).

In this state, when the operation of pushing the tip of the packing holder 5 into contact with the tip of the pipe body 6 to be connected is performed, the packing holder 5 moves backward against the elastic force of the coil spring 10. When the packing holder 5 retreats, the contact piece 19 that is in contact with the large-diameter portion 20 of the packing holder 5 slides on the same and reaches the small-diameter portion 21. The chuck piece 12 is released from being pushed up by the portion 20 and can be rotated in the centripetal direction.

In such a state, the chuck piece 12
Receives the pressure of the operation sleeve 22 that is elastically locked to the outer peripheral surface thereof and prevented from advancing, and the tip side having the occlusal portion 16 pivots in the centripetal direction with the collar portion 13 as a fulcrum.
The female screw portion 15 of the occlusal portion 16 is in contact with the tip of the packing holder 5, and the male screw portion 14 of the tip of the connected pipe body 6
It is sandwiched so that it meshes with. With the rotation of the chuck piece 12 in the centripetal direction, the operation sleeve 22 moves forward while sliding on the outer peripheral surface of the chuck piece 12 by the elastic force of the coil spring 25, and when the operation sleeve 22 reaches the forward position, The pressing projection 24 formed at the tip of the operation sleeve 22 presses the outer circumference of the tip of the chuck piece 12 in the closed state in the centripetal direction, and locks the chuck piece 12 in the closed state . At this time, the lock sleeve 26 is
Larger than the rear end of the operating sleeve 22 whose outer peripheral surface has advanced
Exhibits a sharp protrusion. (Figure 3).

When the connection is established in this way, a valve (not shown) on the supply source side is opened and a high-pressure fluid is caused to flow through the internal passage 4 of the adapter 3 and into the fluid passage 2 of the joint main cylinder 1. This fluid flows to the connected pipe body 6 connected to the joint main cylinder body 1 and, at the same time, passes through the through hole 35 formed in the joint main cylinder body 1 and the joint main cylinder body 1 and the lock sleeve 26. Flows into the space portion 34 formed between.
This space portion 34 is a seal ring 36 that seals between the small-diameter inner peripheral portion 27 and the small-diameter outer peripheral portion 30 on the tip side, and seals between the large-diameter inner peripheral portion 28 and the large-diameter outer peripheral portion 31 on the rear end side. Since the rear end side has a larger pressure receiving area than the front end side because it is sealed by the seal ring 37, the lock sleeve 26 receives the pressure (axial pressure) in the tip direction by the high pressure fluid entering the space 34, Lock sleeve 26
Moves forward against the elastic force of the coil spring 25 between the lock sleeve 26 and the operating sleeve 22, contacts the rear end side of the operating sleeve 22 in the forward position, and moves the operating sleeve 22 backward. Block . At this time, the lock
The sleeve sleeve 26 has the outer peripheral surface thereof which has been advanced.
It exhibits a state of slightly protruding from the rear end of the probe 22. (Fig. 4). The lock sleeve 26 has a structure in which the higher the pressure, the stronger the lock force.

When the joint main cylinder 1 and the connected pipe 6 thus connected are separated from each other, the valve on the supply source side of the high-pressure fluid is closed to stop the fluid supply to stop the joint main cylinder 1. The fluid pressure in the fluid passage 2 is reduced. As a result, the lock sleeve 26 that has moved forward and locked the operation sleeve 22 retracts due to the elastic force of the coil spring 25, and unlocks the operation sleeve 22 . At this time, the lock sleeve 2
Reference numeral 6 denotes a large-diameter outer peripheral portion provided on the rear side of the joint main cylindrical body 1.
The end surface of 31 and the rear end surface of the lock sleeve 26 are substantially the same.
Present in a position. (Figure 3).

When the operating sleeve 22 is retracted from this state against the elastic force of the coil spring 25, the joint main cylinder 1 and the connected pipe body 6 are separated from each other, and the connection standby state shown in FIG. 2 is obtained.

[0030]

As described above, according to the pipe joint of the present invention, when the pipe is connected to the pipe to be connected, it is simply pressed against the pipe to be connected, and when the pipe is separated, the operating sleeve is simply attached. Since it can be performed by one-touch operation such as retracting, connection and separation work can be easily performed, and the pressure of the fluid in the flow path is used without performing a special operation to lock the operation sleeve in the connected state. Since the operation sleeve can be automatically locked, a highly safe pipe joint can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of an example of an embodiment of a pipe joint according to the present invention.

FIG. 2 is a vertical sectional side view of an upper half part showing a standby state of the pipe joint of the present example.

FIG. 3 is a vertical sectional side view of an upper half part showing a connected state of the pipe joint of the present example.

FIG. 4 is a vertical cross-sectional side view of an upper half portion showing a locked state of the pipe joint of the present example in a connected state.

FIG. 5 is a vertical cross-sectional side view of an upper half part showing the posture of each part in a connected state of a conventional pipe joint.

FIG. 6 is a partially cutaway plan view of a conventional pipe joint.

[Explanation of symbols]

1 Joint main cylinder 2 fluid passage 3 adapter 4 internal passages 5 packing holder 6 Connected pipe 7 packing 8 circumferential groove 9 screws 10 coil spring 11 seal ring 12 chuck pieces 13 collar part 14 Male thread 15 Female thread 16 occlusal part 17 Locking recess 18 spring band 19 Contact piece 20 Large diameter part 21 Small diameter part 22 Operation sleeve 23 Locking protrusion 24 Pressing protrusion 25 coil spring 26 Lock Sleeve 27 Small diameter inner circumference 28 Large diameter inner circumference 29 Medium diameter inner circumference 30 Small diameter outer circumference 31 Large diameter outer circumference 32 tubular member 33 stop ring 34 Space Department 35 through hole 36 seal ring 37 seal ring 38 seal ring 39 seal ring 40 safety loop body

Claims (3)

(57) [Claims] 1. A joint main cylinder having a fluid passage therein,
A cylindrical packing holder that slidably fits the rear end side inside the joint main cylinder body and abuts on the tip of the connected pipe body via a packing, and is formed at the tip of the joint main cylinder body. A plurality of chuck pieces, which are rotatably supported in the middle of the collar portion in the centrifuge direction, and which pivot in the centrifuge direction to open and close to sandwich the connected pipe body that abuts the packing holder, and a joint main body. An operating sleeve that slidably fits on the outer circumference of the tip end side of the tubular body and moves forward to press the chuck piece in the centripetal direction on its inner circumferential surface to lock it in the closed state, and the rear end side of the joint main tubular body Fit on the outer circumference,
The chuck sleeve comprises a lock sleeve that is moved forward by receiving fluid pressure in the joint main cylinder to prevent the advanced operation sleeve from retracting. The chuck piece has an inner surface protruding from the tip of the joint main cylinder. The packing holder is provided with an abutting piece that comes into contact with the outer peripheral surface of the packing holder, and the packing holder has a large diameter that pushes up the abutting piece when the packing holder advances and rotates the chuck piece in the centrifugal direction. And a small diameter portion that releases the push-up of the contact piece at the time of retreat and enables the chuck piece to rotate in the centripetal direction, and in the operation sleeve, the chuck piece is opened. When the chuck piece is in a closed state, it is possible to move forward by being locked to the outer peripheral surface of the joint, and when the chuck piece is closed, a space is formed between the lock sleeve and the joint main cylinder. And a through hole that connects the space portion and the fluid passage in the joint main cylinder is formed in the joint main cylinder, and further, between the joint main cylinder and the packing holder and between the operation sleeve and the lock sleeve. Springs are elastically interposed between the lock sleeves,
The operating sleeve is in the forward position and the connected pipe
The pressure fluid is supplied to the body through the fluid passage of the joint main cylinder.
To prevent the operating sleeve from moving backward when
A pipe joint characterized by being provided in . 2. The lock sleeve is connected to a pipe body to be connected.
When the joint is connected, the operating sleeve advances and locks.
The outer peripheral surface of the sleeve largely protrudes from the rear end of the operating sleeve.
Is provided to advance the lock sleeve
Sometimes the outer peripheral surface of the lock sleeve is the rear end of the operating sleeve.
It is characterized in that it is provided so as to project from
The pipe joint according to claim 1. 3. The lock sleeve is the spring.
When retracted due to the elastic force of
End surface of the large diameter outer peripheral part and the rear end of the lock sleeve
Make sure that the surface and the surface are almost in the same position.
The pipe joint according to claim 1, which is characterized.