JP3931176B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint provided with a plug and a socket.

  In order to connect one pipe to which the fluid flows and the other pipe, a pipe joint that is detachably connected by inserting a plug attached to the end of one pipe into a socket attached to the end of the other pipe Is used. Conventionally, there exists a thing of the structure described below as this pipe joint (for example, refer patent document 1).

  The plug of this pipe joint has a cylindrical plug body whose both ends are open and a base end part is attached to one pipe, and a closed position where the distal end of the plug body is abutted and closed inside the plug body. A plug valve provided so as to be movable between an open position spaced apart from the closed position of the plug main body with respect to the closed position; and an elastic member that applies a force toward the closed position with respect to the plug valve. ing.

  The socket of this pipe joint has a cylindrical socket body in which both ends are opened and a base end part is attached to the other pipe, and a plug body is inserted into the inside through a distal end opening. It has a communication hole that communicates with the end opening and communicates with the inside and outside, and when the plug body is inserted into the socket body and moves in the direction of entry, it contacts the plug valve through the opening at the end of the plug body. Between the inner cylinder that contacts and moves the plug valve toward the open position, the closed position that closes the communication hole in the outer peripheral portion of the inner cylinder, and the open position that is spaced away from the closed position toward the base end of the socket body. An annular socket valve that is movably provided and that contacts the plug main body and is pushed toward the open position when the plug main body is inserted into the socket main body and moves in the direction of entry; And an elastic member for applying a force toward the closed position relative to the socket valve.

  In addition, when the plug main body is inserted into the socket main body and moves in the direction of entry, the pipe joint sockets the plug main body at a position where the plug valve is positioned at the open position and the socket valve is positioned at the open position. A fixing means for detachably fixing the main body is provided.

  That is, when connecting the plug of this pipe joint and the socket, if the plug body is inserted into the socket body and moved in the direction of entry, the plug body abuts against the socket valve and resists the elastic member. The inner cylinder abuts against the plug valve and moves it from the closed position to the open position against the elastic member. At this time, the fixing means is connected to the plug body and the socket body. To fix. The fluid can flow through the plug body and the socket body.

When releasing the connection between the plug and the socket, when the fixing of the plug body and the socket body by the fixing means is released, the elastic member provided on the socket pushes the socket valve to move from the open position to the closed position, and Apply force in the direction in which the valve exits the plug body. Further, the elastic member provided on the plug pushes the plug valve to move it from the open position to the closed position, and a force is applied in such a direction that the plug valve comes into contact with the inner cylinder and retracts to the plug body. As a result, the plug body moves in the direction of withdrawal and jumps out from the inside of the socket body.
JP 7-208757 A

  Such conventional pipe joints have the following problems. When the connection between the plug and the socket is released, the plug body moves away from the socket valve in the process of moving away from the socket body. At this point, the plug valve closes the opening of the plug body at the closed position (closed position). It is necessary to prevent the fluid inside the plug body from leaking out from the opening of the tip.

  However, when releasing the connection between the plug and the socket, the plug valve still reaches the opening (closed position) of the plug body when the plug body moves away from the socket valve in the process of moving away from the socket body. The tip opening may not be closed. That is, the plug body may be separated from the socket valve before the plug valve closes the tip opening of the plug body, and in this case, the fluid inside the plug body leaks out from the tip opening.

  Further, when the plug body moves away from the socket body in the process of moving away from the socket body, the socket valve has not yet reached the closed position for closing the communication hole of the inner cylinder, so that the fluid inside the inner cylinder communicates. It may leak from the hole into the socket body.

  The present invention provides a pipe joint that prevents the occurrence of a situation where fluid leaks from the plug when the connection between the plug and the socket is released, and prevents the occurrence of a situation where fluid leaks from the socket.

The pipe joint according to the first aspect of the present invention includes a plug body whose both ends are open, a closed position in which the front end opening of the plug body is abutted and closed inside the plug body, and the plug body with respect to the closed position. A plug valve provided so as to be movable between an open position spaced apart from the base end side and opening the distal end opening, and an elastic member that applies force to the plug valve toward the closed position When,
A socket body in which both end portions are opened and the plug body is inserted into the inside through a distal end opening, and a communication hole provided inside the socket body so as to communicate with the base end opening of the socket body and communicate with the inside and outside. And when the plug main body is inserted into the socket main body and moves in the direction of entry, the end face of the front end abuts on the end face of the front end of the plug valve and moves the plug valve from the closed position to the open position. An inner cylinder to be moved, a closed position where the communication hole is closed on the outer periphery of the inner cylinder, and an open position where the communication hole is spaced apart from the closed position on the base end side of the socket body. When the plug main body is inserted into the socket main body and moves in the direction of entry, the end face of the front end abuts on the end face of the plug main body. A socket having a resilient member for applying a force toward the closed position relative to the socket valve and the socket valve which is moved toward the open position from the closed position by,
When the plug body is inserted into the socket body and moves in the direction of entry, the plug valve is located in the open position and the plug body is located with respect to the socket body at the position where the socket valve is located in the open position. Fixing means for detachably fixing,
Connecting means for connecting the plug main body and the socket valve when the plug main body is inserted into the socket main body and moving the socket valve integrally when the plug main body moves in a retreating direction;
When the plug body moves together with the socket valve in a direction of retreating from the inside of the socket body, the plug body by the connecting means is located at a position where the plug valve is located in the closed position and the socket valve is located in the closed position. Connection release means for releasing connection with the socket valve is provided.

According to a second aspect of the present invention, there is provided a pipe joint having a plug body having both ends opened, a closed position in which the front end opening of the plug body is contacted and closed inside the plug body, and the plug body with respect to the closed position. A plug valve provided so as to be movable between an open position spaced apart from the base end side and opening the distal end opening, and an elastic member that applies force to the plug valve toward the closed position When,
A socket body in which both end portions are opened and the plug body is inserted into the socket body through the distal end opening. The socket body is provided in the socket body so as to communicate with the proximal end opening of the socket body. In addition to having a communication hole that communicates with the inside and the outside at a separated location, the outer peripheral part between the communication hole and the tip has a recess that opens the communication hole, and the plug body is an interior of the socket body. An inner cylinder that makes the tip end face abut against the tip end face of the plug valve and moves the plug valve toward the open position when it moves in the direction of entering the plug valve, forms an annular shape, and makes the plug body tip from the tip end face The plug main body extends toward the side and overlaps the outer peripheral surface of the distal end portion of the inner cylinder and moves when the plug main body is inserted and moved into the socket main body. A closed position where the partition wall overlaps with the inner peripheral surface of the tip, and the partition wall surrounds and contacts the outer periphery of the inner cylinder, and an open position facing the recess. When the plug main body is inserted into the socket main body and moves in the direction of entry, the plug main body comes into contact with the end surface of the tip of the plug main body and is moved from the closed position to the open position. A socket provided with a socket valve, and an elastic member that applies force to the socket valve toward the closed position;
When the plug body is inserted into the socket body and moves in the direction of entry, the plug valve is located in the open position and the plug body is located with respect to the socket body at the position where the socket valve is located in the open position. Fixing means for detachably fixing,
Connecting means for connecting the plug main body and the socket valve when the plug main body is inserted into the socket main body and moving the socket valve integrally when the plug main body moves in a retreating direction;
When the plug body moves together with the socket valve in a direction of retreating from the inside of the socket body, the plug body by the connecting means is located at a position where the plug valve is located in the closed position and the socket valve is located in the closed position. Connection release means for releasing connection with the socket valve is provided.

  According to the configuration of the present invention, when the plug body is moved in the direction of retracting from the inside of the socket body to the outside, the socket valve is moved in the direction of retracting integrally, the plug valve is located at the closed position and the socket valve is closed. Since the connection between the plug body and the socket valve by the connecting means is released at the position located at the position, when the connection between the plug and the socket is released, the fluid leaks from the plug and the fluid leaks from the socket. Can be prevented.

  According to the pipe joint of the first aspect of the invention, when the plug body is moved in the direction of withdrawal from the inside of the socket body, the socket valve is moved in the direction of withdrawal integrally, and the plug valve is located at the closed position. Since the connection between the plug body and the socket valve by the connecting means is released at the position where the socket valve is located at the closed position, it is possible to prevent the occurrence of a situation where fluid leaks from the plug when the connection between the plug and the socket is released. Occurrence of fluid leaking from the socket can be prevented.

  According to the pipe joint of the invention of claim 2, in the state where the partition is provided in the socket valve and the plug and the socket are separated, they are brought into contact with the peripheral surface of the tip of the inner cylinder, and the plug is connected to and separated from the socket. In the connected state, the contact portion between the plug body tip end surface and the socket valve recessed surface is isolated by the partition wall portion from the contact portion between the plug valve tip end surface and the inner cylinder tip end surface. When the connection between the socket and the socket is released, it is possible to more reliably prevent liquid dripping from the contact portion between the end surface of the plug body tip and the socket valve recess.

  According to claim 3, by configuring the coupling means and the coupling releasing means, the operation required as the coupling means and the coupling releasing means can be reliably and easily performed by utilizing the configuration of the pipe joint including the plug and the socket. Can do.

  A first embodiment of the present invention will be described with reference to FIGS. FIGS. 1 to 3 are partially cutaway front views showing a pipe joint in this embodiment. FIG. 1 shows a state in which the plug and the socket are separated, FIG. 2 shows a state in which the plug and the socket are connected, and FIG. The states of entering and exiting are shown.

  The pipe joint in this embodiment connects a pipe 101 and a pipe 102 through which a fluid, for example, a gas, flows, and includes a plug 1 attached to the pipe 101 and a socket 2 attached to the pipe 102.

  The plug 1 includes a plug body 11, a plug valve 12, and an elastic member 13. The plug main body 11 forms a cylindrical body, and openings 11a and 11b are formed at a distal end portion (right end portion in the drawing) and a base end portion (left end portion in the drawing), respectively, so that fluid can flow therethrough. The diameter of the distal end opening 11a of the plug body 11 is set to be smaller than the inner diameter of the plug body 11, and the inner peripheral surface of the plug body 11 is continuous from the distal end opening 11a to the proximal end portion from the distal end portion. The stop surface 11c which makes the taper which a diameter expands toward is formed. The end of the tube 101 is attached to the base end opening 11 b of the plug body 11.

  The plug valve 12 forms a cylindrical body, and is fitted inside the plug body 11 so as to be movable along the axial direction. The plug valve 12 has a distal end portion (right end portion in the drawing) 12a closed, and a plurality of communication holes 12b communicating with the inside and the outside at locations adjacent to the distal end portion 12a are dispersed in the circumferential direction. Individually formed. The distal end portion 12a of the plug valve 12 is set to have a small diameter so that it can be fitted into the distal end opening 11a of the plug body 11, and the plug valve 12 has a portion (communication hole) continuous from the distal end portion 12a. 12b) is a stop surface 12c having a taper whose diameter increases from the distal end portion toward the proximal end portion. For this reason, when the plug valve 12 is moved toward the distal end portion of the plug body, the stop surfaces 12c and 11c come into contact with each other to stop the movement, and the distal end portion 12a is fitted into the distal end opening 11a of the plug body 11. The communication hole 12b is covered with the inner peripheral surface (stop surface 11c) of the plug body 11 and closed.

  The plug valve 12 closes the distal end portion of the plug body 11 to block the fluid flow (shown in FIG. 1), and an open position (moved toward the plug body base end portion away from the closed position) (see FIG. 1). 2) and move along the axial direction. The opening position is determined by the dimensions of each part of the plug 1 and the socket 2, the force of the elastic member, and the like. When the plug valve 12 moves to the open position, the distal end portion of the plug valve 12 is located between the outer peripheral surface of the distal end portion 12a of the plug valve 12 and the inner peripheral surface of the plug body 11 facing the outer peripheral surface of the distal end portion 12a. A space portion (fluid passage) surrounding the outer peripheral surface of 12a is formed.

  The elastic member 13 is composed of a compression coil spring, and is disposed in the plug body 11 in the axial direction so as to be positioned on the plug body proximal end side with respect to the plug valve 12. One end of the elastic member 13 is engaged with the plug valve 12, and the other end is supported by an annular spring receiver 14 attached to the inside of the plug body 11. As a result, the elastic member 13 applies force to the plug valve 12 toward the closed position to hold the plug valve 12 in the closed position.

  Reference numeral 15 is provided at the tip end opening 11a of the plug body 11, and a seal between the inner peripheral surface of the tip end opening 11a and the outer peripheral surface of the tip end portion 12a of the plug valve 12, and the tip end opening 11a and the inner cylinder. A seal ring 16 that seals between the outer peripheral surface 22 and a seal ring 16 that is provided inside the plug body 11 and seals between the plug body 11 and the tube 101.

  The socket 2 includes a socket main body 21, an inner cylinder 22, a socket valve 23, and an elastic member 24. The socket main body 21 is formed of a cylindrical body, and openings 21a and 21b are formed at the distal end portion (the left end portion in the drawing) and the base end portion (the right end portion in the drawing), respectively, so that fluid flows through the inside. The inside of the socket main body 21 is for inserting the plug main body 11 of the plug 1 from the front end opening 21a to the base end portion. Has a large diameter. The end of the tube 102 is attached to the base end opening 21 b of the socket body 21.

  The inner cylinder 22 is composed of a cylindrical body having an outer diameter that can be inserted into contact with the distal end opening 11a of the plug valve 12 and a length shorter than the length of the inner hole. Located on the axis, the socket body 1 is provided from a base end portion to a portion close to the tip end portion. The distal end portion (the left end portion in the drawing) 22a of the inner cylinder 22 is closed, the proximal end portion (the right end portion in the drawing) is opened and communicates with the proximal end opening 21b of the socket body 21, and the distal end portion 22a is connected to the peripheral wall portion. On the other hand, a plurality of communication holes 22c communicating with the inside and the outside of the plug valve 22 are formed side by side in the circumferential direction at locations adjacent to the plug valve proximal end side. A flange portion 22 b is formed at the proximal end portion of the inner cylinder 22. The base flange portion 22 b is in contact with the base end portion of the socket body 21, and the ring attached to the socket body 21 is pressed by the inner cylinder presser 25.

  The socket valve 23 forms a cylindrical body having a diameter corresponding to the inside diameter of the socket main body 21, and a wall portion 23 a is formed inside the cylindrical body at an axially central portion. A hole 23b having a diameter corresponding to the outer diameter of the inner cylinder 22 is formed on the central axis of the central wall portion 23a. The inner diameter of the distal end portion (the left end portion in the figure) of the socket valve 23 is such that the distal end portion of the plug body 11 can be inserted and contacted. The socket valve 23 is disposed inside the socket main body 21 so as to be fitted to the outer peripheral portion of the inner cylinder 22, the outer peripheral surface is in contact with the inner peripheral surface of the socket main body 21, and the inner peripheral surface of the hole 23 b is the outer periphery of the inner cylinder 22. Touching the surface.

  That is, the socket valve 23 is supported by the outer peripheral portion of the inner cylinder 22 and is provided so as to be movable along the axial direction of the socket body 21. When the central wall portion 23 a of the socket valve 23 is positioned at the tip end portion 22 a of the inner cylinder 22, the inner peripheral surface of the hole 23 b closes each communication hole 22 c of the inner cylinder 22. This is the closing position A of the socket body 23. An annular stopper 26 is attached at a location near the tip in the socket body 21. When the socket valve 23 is in the closed position A, the tip of the socket valve 23 abuts against the stopper 26 and the movement toward the tip of the socket body is restricted, and the central wall portion 23a is prevented from coming off from the tip of the inner cylinder 22. Yes. In addition, the axial direction length of the center wall part 23a is a magnitude | size which can close the communicating hole 22c of the inner cylinder 22 with margin. As described above, the socket valve 23 is provided so as to be movable between the closed position A and the open position B separated from the closed position A toward the socket body base end side.

  The elastic member 24 is formed of a compression coil spring, and is disposed in the socket body 21 along the axial direction so as to be located on the inner peripheral side of the socket valve 23 on the socket body base end side with respect to the socket valve 23. Yes. One end of the elastic member 24 is engaged with the end surface (right end surface in the drawing) of the central wall portion 23a of the socket valve 23, and the other end is supported by the inner tube 22 on the base flange portion 22b. As a result, the elastic member 24 applies a force toward the closing position A to the socket valve 23 and holds it at the closing position A.

  Reference numeral 27 denotes a seal ring provided on the inner peripheral surface of the hole 23 c of the socket valve 23, which seals between the inner peripheral surface of the hole 23 c and the outer peripheral surface of the inner cylinder 22. The seal ring 27 is located on the front end side of the socket body with respect to the communication hole 22c of the inner cylinder 22 when the socket valve 23 is in the closed position A, and seals the communication hole 22c from the inside of the socket body 21. It has become. A seal ring 28 is provided on the end face (left end face in the drawing) of the center wall portion 23a of the socket valve 23. This seal ring connects the plug 1 and the socket 2 to connect the tip surface of the plug body 1 and the center wall portion. When the end surface of 23a abuts, sealing between both end surfaces is performed. Reference numeral 29 denotes a seal ring provided on the outer peripheral surface of the socket valve 23, which seals between the outer peripheral surface of the socket valve 23 and the inner peripheral surface inside the socket body 21.

  The plug 1 and the socket 2 are provided with fixing means. When the plug body 11 is inserted into the inner hole of the socket body 21 and moves in the direction of entry, the fixing means is located at the place where the plug valve 23 is located in the open position and the socket valve 12 is located in the open position. 11 is detachably fixed to the socket body 21.

  This fixing means will be described. In the peripheral wall portion of the socket body 21, a plurality of ball holding holes 31 penetrating in the radial direction are formed at intervals on the distal end side of the socket body with respect to the stopper 26. Balls 32 are arranged in the holes 31 so as to be movable in the radial direction. Each ball holding hole 31 forms a taper in which the hole diameter decreases from the outer peripheral side to the inner peripheral side of the socket body 21. The ball 32 is disposed in the ball holding hole 31 and is restricted from moving toward the inner peripheral side of the plug body, and a part of the ball 32 protrudes from the opening of the ball holding hole 31 toward the inner peripheral side of the socket body 21.

  An engagement groove 33 is continuously formed over the entire circumferential direction on the outer peripheral side of the peripheral wall portion in the axial direction intermediate portion of the plug body 11. For example, the engagement groove 33 is an open portion so as to be easily engaged with the ball 32. Is getting wider. The engaging groove 33 faces the ball holding hole 31 formed in the socket main body 21 when the plug main body 11 is inserted into the socket main body 21 and enters the maximum, and the balls 32 disposed in the ball holding holes 31 are inserted. It is received and engaged. When the ball 32 engages with the engagement groove 33 of the plug body 11, the plug body 11 is fixed to the socket body 21.

  The diameter of the outer peripheral surface from the front end portion of the plug body 11 to the front of the engaging groove 33 is set to be larger than the diameter of the front end portion and smaller than the base end portion. This is to avoid the protruding portion of the ball 32 and the stopper 26 when the plug body 11 moves inside the socket body 21.

  An operation sleeve 34 is provided on the outer peripheral side at the tip of the socket body 21 so as to be movable in the axial direction. The operation sleeve 34 has a sliding contact surface whose inner peripheral surface is in sliding contact with the outer peripheral surface of the socket main body 21, and a space portion is continuously formed on the sliding contact surface. An elastic member 35 made of a compression coil spring fitted to the outer peripheral portion of the socket body 21 is disposed in the space portion of the operation sleeve 34, and the elastic member 35 faces the operation sleeve 34 toward the tip of the socket body. I am adding power. An escape groove 34a is continuously formed in the inner circumferential portion of the distal end of the operation sleeve 34 over the entire circumferential direction, and the distal end portion of the escape groove 34a is opened. A stopper 36 made of a ring is attached to the outer periphery of the tip of the socket body 21, and a relief groove 34 a of the operation sleeve 34 is in contact with the stopper 36 via the tip opening portion. For this reason, the movement of the operation sleeve 24 pushed toward the distal end side of the socket body by the elastic member 35 is restricted. In this state, the slidable contact surface of the operation sleeve 34 is positioned so as to surround and cover each ball holding hole 31 of the socket body 2, and the movement to the outer peripheral side of the socket body is restricted by pressing the ball 32 disposed in each ball holding hole 31. is doing. Therefore, each ball 32 protrudes from each ball holding hole 31 toward the inner peripheral side of the socket body.

  Further, when the operation sleeve 34 moves toward the socket body base end side and the escape groove 34a comes to a position surrounding each ball holding hole 31 of the socket body 21, the outer peripheral side opening of each ball holding hole 31 is opened. Thus, the ball 32 of each ball holding hole 31 can escape to the escape groove 34a and move to the outer peripheral side of the socket body.

  The plug 1 and the socket 2 are provided with connecting means. The connecting means connects the plug body 11 and the socket valve 23 when the plug body 11 is inserted into the socket body 21, and the direction in which the plug body 11 enters the socket body 11 and the socket body 11. The socket valve 23 is moved when moving from the inside to the outside.

  This connecting means will be described. When the plug 1 is inserted into the socket 2, the plug is inserted into the tip of the socket valve 23 (the space on the tip side of the peripheral wall of the socket valve 23 with respect to the central wall 23b, the left end space in the figure). The front end portion (right end portion in the figure) of the main body 11 enters and overlaps the outer peripheral side and the inner peripheral side. At this time, the end surface of the distal end portion of the plug body 11 and the end surface of the distal end portion of the wall portion 23a of the socket valve 23 come into contact with each other. Here, the tip of the socket valve 23 is the overlapping portion 23c, and the tip of the plug body 11 is the overlapping portion 11d.

  In the overlapping portion 23c of the plug valve 23, a plurality of ball holding holes 41 penetrating in the radial direction are formed at intervals in the socket body circumferential direction. It is arranged to be movable. Each ball holding hole 41 forms a taper in which the hole diameter decreases from the outer peripheral side to the inner peripheral side of the socket valve 23. The ball 42 is disposed in the ball holding hole 41 and is restricted from moving toward the inner peripheral side of the plug body, and a part of the ball 42 projects from the opening of the ball holding hole 41 to the inner peripheral side of the socket valve 43.

  An engagement groove 43 is formed on the outer peripheral side of the overlapping portion 11d of the plug body 11 over the entire circumferential direction. The engagement groove 43 has, for example, a wide open portion so that the ball 42 can be easily engaged. The engaging groove 43 faces each ball holding hole 41 formed in the socket valve 23 when the plug main body 11 is inserted into the socket main body 21 and moved to the maximum direction so as to enter the socket main body 21. The arranged ball 42 is received. That is, the ball 42 of each ball holding hole 41 is engaged with the engagement groove 43 of the plug body 11, the plug body 11 and the plug valve 23 are connected, and both can move integrally.

  The outer peripheral surface of the socket valve 23 is in contact with the inner peripheral surface inside the socket body 21. In this state, the inner peripheral surface of the socket main body 21 surrounds each ball holding hole 41 of the plug valve 23 and presses the ball 42 of each ball holding hole 41 to restrict movement of the socket main body to the outer peripheral side of the socket main body. Each ball 42 protrudes from each ball holding hole 41 toward the inner peripheral side of the socket body.

  By configuring the connecting means in this way, the operation required as the connecting means can be reliably and easily performed by utilizing the configuration of the pipe joint including the plug 1 and the socket 2.

  The socket body 21 is provided with connection release means. This uncoupling means is a place where the plug valve 12 is located at the closed position and the socket valve 23 is located at the closed position when the plug body 11 moves together with the socket valve 23 in the direction of retreating from the inside of the socket body 21 to the outside. Thus, the connection between the plug body 11 and the socket valve 23 by the connecting means is released. That is, when the plug main body 11 moves in the direction of retreating from the inside of the socket main body 21 to the outside, the contact portion between the front end surface of the plug main body 11 and the front end surface of the socket valve 23 is in contact with the front end surface of the plug valve 12. When the contact portion with the front end surface of the tube 22 is reached, the connection between the front end surface of the plug main body 11 and the front end surface of the socket valve 23 is released.

  The connection release means will be described. A location where the connection between the plug body and the socket valve is released on the inner peripheral surface of the socket body 21, specifically, the socket valve 23 is pushed by the elastic member 24 and collides with the stopper 26 to move toward the tip of the socket body. When the valve is restricted, a relief groove 44 is provided in a circumferential direction at a position facing each ball holding hole 41 formed in the socket valve 23 (a position located on the plug body base end side with respect to the valve stopper 26). It is formed continuously throughout.

  The escape groove 44 comes to a position where each ball holding hole 41 of the socket valve 23 is surrounded by the escape groove 44 in a state in which the socket valve 23 moves in the retreating direction and comes into contact with the stopper 26 and stops moving. The opening on the outer peripheral side of each ball holding hole 41 that has been blocked by the inner peripheral surface of the socket main body 21 is opened, and the ball 42 of each ball holding hole 41 escapes from the ball holding hole 41 to the escape groove 44 and the outer periphery of the socket main body. It is possible to move to the side.

  By configuring the connection releasing means in this manner, the necessary operation can be performed reliably and easily by utilizing the configuration of the pipe joint including the plug 1 and the socket 2.

The operation of the pipe joint thus configured will be described.
As shown in FIG. 1, when the plug 1 and the socket 2 are separated, in the plug 1, the plug valve 12 is pushed by the elastic member 13 and the closed position (the distal end portion 12 a of the plug valve 12 is the plug body 11). At the front end opening 11a. In the socket 2, the socket valve 23 is pushed by the elastic member 24 and collides with the stopper 26, so that the communication hole 22 c of the inner cylinder 22 is closed at the closed position A.

  When connecting the plug 1 and the socket 2, as shown in FIG. 3, the front end of the plug main body 1 of the plug 1 is inserted into the inside through the front end opening 21a of the socket main body 21 of the socket 2, and the plug main body is further inserted. 11 is moved in a direction to enter the inside of the socket body 21 (direction C in the figure). When the plug body 11 moves in the direction of entry, the end face of the tip end portion of the plug body 11 comes into contact with the end face of the tip end portion of the wall portion 23a of the socket valve 23, and the tip end portion 12a of the plug valve 12 and the tip end of the inner cylinder 22 are brought into contact. The end surface of the portion 22a comes into contact. Since the inner cylinder 22 is fixed to the socket body 11, the plug valve 23 abutting against the tip of the inner cylinder 22 is prevented from moving in the entering direction and stopped at that position.

  Further, when the plug body 11 is moved in the direction of entry, the distal end opening 11a of the plug body 11 is guided to the outer peripheral surface of the inner cylinder 22 beyond the distal end 22a of the inner cylinder 22 and toward the proximal end side. And move in the direction of entry. The plug body 11 pushes the socket valve 23 against the force of the elastic member 24 and moves toward the proximal end of the socket body 21, that is, moves in the direction of entry. As the socket valve 23 is guided and moved into the inner cylinder 22, each ball holding hole 41 is displaced from the position of the relief groove 44 of the socket body 21 and is blocked by the inner peripheral surface of the socket body 21. Therefore, the ball 42 of each ball holding hole 41 is engaged with the engagement groove 43 of the plug valve 12 so that the plug body 11 and the socket valve 23 are connected.

  Since the plug valve 12 is in contact with the inner cylinder 23 and stopped, the elastic member 13 is compressed toward the proximal end side while compressing the elastic member 13 as the plug body 11 moves in the entering direction. Will move. Therefore, the stop surface 12c of the plug valve 12 is separated from the stop surface 11c of the plug body 11, and the communication hole 12b of the plug valve 12 is opened. Here, the force of the elastic member 35 is set to be equal to or smaller than that of the elastic member 24, and the plug body 11 can be easily moved in the entering direction.

  Then, as shown in FIG. 2, when the plug body 11 is moved into the socket body 21 to the maximum length, the engagement grooves 33 of the plug body 11 face the ball holding holes 31 of the socket body 21. The balls 32 arranged in the respective ball holding holes 31 are pushed toward the inner peripheral side of the socket body by the inner peripheral surface of the operation sleeve 34 and engage with the engaging grooves 33 of the plug main body 11, and the plug main body 11, the socket main body 21 and the like. To fix.

  When the plug body 11 is moved to the maximum length, the distal end opening 11a moves to the proximal end side of the inner cylinder 22 beyond the communication hole 22c. The socket valve 23 pushed by the plug body 11 also moves to the proximal end side of the inner cylinder 22 through the communication hole 22c and reaches the open position B. For this reason, the communication hole 22c of the inner cylinder 22 is opened. Here, the contact portion between the distal end of the plug main body 11 and the distal end of the socket valve 23 is located on the proximal end side of the inner cylinder 22 with respect to the communication hole 22 c on the outer peripheral surface of the inner cylinder 22.

  A cylindrical space 51 is formed between the inner peripheral surface of the socket main body 21 and the outer peripheral surface of the distal end portion of the plug valve 12 and the outer peripheral surface of the distal end portion of the inner cylinder 22 positioned inside the socket main body 21. Is done. The space 51 communicates with the communication hole 22 c of the inner cylinder 22 located inside the plug main body 11 and communicates with the communication hole 12 b of the plug valve 12 located inside the plug main body 11.

  Therefore, the tube 101, the base end opening 11a of the plug main body 11, the inside of the plug valve 12, the communication hole 12b, the space 51, the communication hole 22c, the inside of the inner cylinder 22, the base end opening 21b of the plug main body 21, and The tube 103 communicates. Thereby, a fluid, for example, a gas can flow through the tube 101, the plug 1, the socket 2 and the tube 102. A gap between the tip opening 11a of the plug body 11, the hole 23b of the socket valve 23 and the outer peripheral surface of the inner cylinder 22 is sealed by a seal ring 15 and a seal ring 27, and the tip of the plug body 11 and the tip of the socket valve 23 are sealed. The contact portion is sealed by the seal ring 28, and leakage of fluid to the outside can be prevented. This pipe joint is provided, for example, in a pipe for flowing gas in a semiconductor manufacturing facility.

Next, a case where the plug 1 and the socket 102 are removed will be described.
When the operation sleeve 34 is moved toward the base end portion of the socket body 21 against the force of the elastic member 35 and displaced to the position indicated by the two-dot chain line in FIG. It comes to a position facing the holding hole 31. Therefore, the press of the ball 32 by the operation sleeve 34 is released, and the ball 32 can move to the outer peripheral side of the socket body 21.

  The elastic member 24 of the socket 2 applies a force toward the tip of the socket body to the plug body 11 via the socket valve 23. The plug body 11 moves in the direction of retreating from the inside of the socket body 21 to the outside, that is, the direction D in FIG. The ball 32 protruding from the ball holding hole 31 toward the inner periphery of the socket body due to the movement of the plug body 11 is pushed by the wall surface of the engaging portion 33 of the plug body 11 and escapes into the escape groove 34a to the outer periphery side of the socket body 21. The plug body 11 and the socket body 21 are unlocked by moving. The plug body 11 moves in the direction of withdrawal, and the outer peripheral surface of the axially intermediate portion having a small outer diameter passes through the ball holding hole 31. Therefore, even when the operation sleeve 34 is returned to the original position by the elastic member 35, the ball 32 can protrude toward the inner peripheral side of the socket body, and the plug body 11 can move.

  The overlapping portion 11d of the plug body 11 and the overlapping portion 23c of the socket valve 23 are overlapped, and the balls 42 arranged in the respective ball holding holes 41 of the overlapping portion 23c engage with the engaging grooves 43 of the overlapping portion 11d, and the socket body The inner peripheral surface of 21 prevents the ball 42 from moving to the outer peripheral side, and the plug body 11 and the plug valve 23 are connected. For this reason, when the plug main body 11 moves in the retreating direction, the plug main body 11 and the plug valve 23 move together in a connected state. That is, the plug body 11 and the plug valve 23 move together while maintaining a state in which the end surface of the distal end portion of the plug body 11 and the end surface of the distal end portion of the socket valve 23 are in contact with each other.

  As shown in FIG. 3, the contact portion between the end surface of the distal end portion of the plug main body 11 and the end surface of the distal end portion of the socket valve 23 is the end surface of the distal end portion of the plug valve 12 and the end surface of the distal end portion of the inner cylinder 22. When reaching the position facing the contact portion, each ball holding hole 41 of the socket valve 23 reaches the E position facing the escape groove 44 formed at the tip of the socket body 21. As a result, the pressing of the ball 42 by the inner peripheral surface of the socket body 21 is released, and the ball 42 can move to the outer peripheral side of the socket valve 23. When the plug body 11 tries to move further away from the E position, the wall surface of the engagement groove 43 pushes the ball 42 toward the outer peripheral side of the socket valve 23 to release the connection between the plug body 11 and the socket valve 23. It becomes possible to do. This makes it possible to release the contact between the end surface of the distal end portion of the plug body 11 and the end surface of the distal end portion of the socket valve 23.

  At this time, the distal end portion 12a of the plug valve 12 is fitted into the distal end portion opening 11a of the plug body 11 to close the distal end portion opening 11a and the communication hole 12c. That is, in the plug 1, the plug valve 12 is in the closed position. The socket valve 23 closes the communication hole 22c of the inner cylinder 22 on the inner peripheral surface of the hole 23c. That is, in the socket 2, the socket valve 23 is in the closed position.

  Further, when the plug main body 11 moves in the direction of withdrawal, the engagement groove 43 is released from the ball 42 and the connection with the socket valve 23 is released, and the plug main body 11 further moves to move from the socket main body 21 as shown in FIG. Get out.

  As a result, when the plug body 11 moves in the retreating direction with respect to the socket body 21, the plug body 11 and the socket by the connecting means are located where the plug valve 12 is located at the closed position and the socket valve 23 is located at the closed position. The connection with the valve 23, that is, the contact between the end surface of the distal end portion of the plug body 11 and the end surface of the distal end portion of the socket valve 23 is released. In other words, when the plug valve 12 is located at the closed position and the socket valve 23 is located at the closed position, the connection between the plug body 11 and the socket valve 23 by the connecting means, that is, the end face of the tip end portion of the plug body 11 and the socket valve The contact with the end face of the tip of 23 is released.

  Therefore, when the plug main body 11 moves in the direction of retreating with respect to the socket main body 21, the plug main body 11 is separated from the socket valve 23 in a state where the plug valve 12 is located at the closed position. Fluid does not leak out. Further, when the plug main body 11 moves in the direction of retreating with respect to the socket main body 21, the socket valve 23 is separated from the socket main body 11 in a state where the socket valve 23 is located at the closed position. Fluid does not leak outside.

  It is to be noted that the force of the elastic member 24 provided in the socket 2 is increased so that the contact between the end surface of the distal end portion of the plug body 11 and the end surface of the distal end portion of the socket valve 23 is maintained when the plug body 11 is withdrawn. In this case, it is difficult to insert the plug 1 into the socket 2, which is not practical.

  FIG. 4 is a partially cutaway front view showing the pipe joint of the second embodiment, showing a state where the plug and the socket are separated. 4, the same parts as those in FIG. 1 are denoted by the same reference numerals. In this embodiment, an elastic member 24 for applying a force to the socket valve 23 in the socket 2 is provided on the outer peripheral side of the socket valve 23. In the socket valve 23, two seal rings 27 are provided in the axial direction with the communication hole 22c of the inner cylinder 22 interposed therebetween. Since the basic configuration and operation of the pipe joint shown in FIG. 4 are the same as those of the first embodiment described above, description thereof is omitted.

  5 to 7 are partially cutaway front views showing the pipe joint in the third embodiment. FIG. 5 shows a state in which the plug and the socket are separated. FIG. 6 shows a state in which the plug and the socket are connected. Indicates the state of the plug entering and exiting. 5 to 7, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals.

  The pipe joint of this embodiment is for a high pressure, and for example, the pressure of the flowing fluid is, for example, 280 kgf / cm 2 or more. The pipe joint of this embodiment is provided with a tip protrusion 23 d at the tip of the socket valve 23 in the socket 2. Further, a clearance groove 37 is continuously formed in the distal end portion of the inner peripheral surface of the operation sleeve 34 over the entire circumferential direction, and a notch portion 37 a is formed in the distal end portion continuing to the clearance groove 37. . That is, as shown in FIG. 5, in a state where the plug 1 and the socket 2 are separated, the tip protruding portion 23 d of the socket 23 protrudes to the inside of the ball support hole 31 of the socket body 21, and the ball 32 moves to the outside of the ball support hole 31. Extruding. The operation sleeve 34 comes to a stop with the end surface abutting against the stopper 36, and the escape groove 37 faces the ball holding hole 31. For this reason, the ball 32 enters the escape groove 37 and escapes. When the plug 1 is inserted into the socket 2 and connected, the ball 32 is engaged with the engagement groove 33 of the plug body 11 on the inner peripheral surface of the operation sleeve 34. In the plug 2, the inner cylinder 22 also serves as a base end opening of the socket body 21 to connect the tube 102. The elastic member 24 is provided on the outer peripheral side of the socket valve 23. Two seal rings 27 provided in the socket valve 23 are provided in the axial direction with the communication hole 22c of the inner cylinder 22 interposed therebetween.

  The basic configuration and operation of the pipe joint are the same as those in the first embodiment described above. That is, when the plug body 11 is moved in the direction of retreating from the inside of the socket body 21 to the outside, the socket valve 23 is moved in the direction of retreating integrally so that the plug valve 12 is positioned at the closed position and the socket valve 23 is closed. Since the connection between the plug body 11 and the socket valve 23 by the connecting means is released at the position located at the position, occurrence of a situation where fluid leaks from the plug 1 and the socket 2 when the connection between the plug 1 and the socket 2 is released. It is possible to prevent the occurrence of a situation where fluid leaks from each of them.

  FIGS. 8 to 10 are partially cutaway front views showing the pipe joint in the fourth embodiment. FIG. 8 shows a state in which the plug and the socket are separated, FIG. 9 shows a state in which the plug enters and exits, and FIG. Shows the state where the plug and the socket are connected. 8 to 10, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals.

  The plug 1 is not changed at all, and the same number is assigned and a new description is omitted. In the socket main body 21 constituting the socket 2, the one shown in FIGS. 1 to 3 is constituted by itself, but here it is divided into two. The screw parts a are provided to each other, and are integrated by being fastened and fixed. Basically, it has the same configuration.

  The operation sleeve 34 is configured such that the ball 32 provided on the socket body 21 is moved from the ball holding hole 31 to the operation sleeve 34 in a state in which the plug 1 and the socket 2 in FIG. 8 are separated and in a state in which the plug 1 in FIG. It moves into the escape groove 34 a provided and moves to the outer peripheral side of the socket body 21. The elastic member 35 provided between the operation sleeve 34 and the outer peripheral surface of the socket valve 23A is compressed to apply a force that directs the operation sleeve 34 toward the distal end side of the socket body 21. The movement of the operation sleeve 34 is restricted by entering the escape groove 34a of 34. And the stopper 36 provided in the front-end | tip outer peripheral part of the socket main body 21 exists in the exposed state.

  The inner cylinder 22A and the socket valve 23A constituting the socket 2 together with the socket main body 21 are different in structure from those shown in FIGS. 1 to 3 as described below. Further, the elastic member 24 constituting the socket 2 is not changed in shape in any way, but the position used is different.

  The inner cylinder 22A made of a cylindrical body is formed so that the outer diameter of the closed end portion 22a is smaller than the distal end opening 11a of the plug valve 11 with a predetermined dimensional difference. A concave portion 22d is formed in a part of the outer periphery that continues from the distal end portion 22a to the base end side of the socket body 21, and a portion between the concave portion 22d and the flange portion 22b is referred to as an inner cylindrical portion 22e. The outer diameter of the inner cylindrical portion 22e corresponds to the diameter of the hole 23b provided in the socket valve 23A. A communication hole 22c is provided in an inclined portion at the boundary between the recess 22d and the inner cylinder portion 22e, and the outer peripheral side of the recess 22d communicates with the base end opening 21b of the socket body 21.

  The socket valve 23A includes a partition wall 60 that extends from the tip surface toward the tip of the socket body 21 and overlaps the outer peripheral surface of the tip 22a of the inner cylinder 22A. The outer peripheral side of the partition wall 60 is opened in a concave shape toward the tip, and this end surface is referred to as a recessed surface 60a. A further outer peripheral side of the recessed surface 60a is in contact with the inner peripheral surface of the socket body 21, and closes the ball holding hole 31 of the socket body 21 to push the ball 32 up to the escape groove 34a of the operation sleeve 34. 23c is formed.

  The elastic member 24 is located on the outer peripheral side of the base end portion 23d of the socket valve 23A, and is interposed between the socket valve 23A and the inner cylinder flange portion 22b, so that the socket valve 23A is connected to the distal end side of the socket body 21. Applying force to move to. The tip of the overlapping portion 23c of the socket valve 23A is hooked on a step b formed in the ball holding hole 31 of the socket body 21, and the movement from the position to the tip side of the socket body 21 is restricted.

  Reference numeral 62 denotes a seal ring provided on the inner peripheral surface of the inner cylinder front end portion 22a, which is located between the inner peripheral surface of the inner cylinder front end portion 22a and the inner peripheral surface of the socket valve partition wall portion 60 in the state shown in FIGS. The seal is performed. A seal ring 63 is provided on the inner peripheral surface of the base end portion 23d of the socket valve 23A, and always seals between the inner peripheral surface of the socket valve base end portion 23d and the outer peripheral surface of the inner cylinder inner cylinder portion 22e. is there. A seal ring 64 is provided on the end surface of the inner cylinder flange portion 22b, and always seals the end surface of the inner cylinder flange portion 22b and the socket body 21.

  Further, the seal ring 15 is provided in the tip opening 11a of the plug main body 11, and there is no change in forming a seal between the inner peripheral surface of the tip end opening 11a and the outer peripheral surface of the tip end portion 12a of the plug valve 12. However, as shown in FIGS. 9 and 10, in the state where the plug main body 11 is inserted into the socket valve 23A, the objects to be sealed are different as will be described later. The overlapping portion 23c of the socket valve 23A is provided with a plurality of ball holding holes 41 in the circumferential direction, and each of the balls 42 is arranged to be movable in the radial direction, and these balls 42 are formed on the inner peripheral surface of the socket body 21. Opposing the escape groove 44 provided is not changed.

  With such a configuration, when the plug 1 and the socket 2 are separated as shown in FIG. 8, the space between the inner peripheral surface of the base end portion 23d of the socket valve 23A and the outer peripheral surface of the inner cylindrical portion 22e of the inner cylinder 22A. With the presence of the seal ring 63 that forms the seal, the partition wall portion 60 of the socket valve 23A overlaps the outer peripheral surface of the inner cylinder front end portion 22a, and the seal ring 62 seals these overlapping portions. One end of the space portion Ra formed between the valve base end portion 23d is closed.

  That is, the space portion Ra communicates with the proximal end opening 21b of the socket body 21 from the inner cylinder portion 22e through the communication hole 22c, but between the socket valve partition wall portion 60 and the inner cylinder distal end portion 22a. The front end side from the socket body 21 is closed by the seal.

  When connecting the plug 1 and the socket 2, the distal end portion of the plug body 11 of the plug 1 is inserted into the socket body 21 from the distal end opening 21 a of the socket 2, and the plug body 11 enters the socket body 21. . The distal end portion 12a of the plug valve 12 contacts the end surface of the distal end portion 22a of the inner cylinder 22A and the end surface of the partition wall portion 60 of the socket valve 23A. Then, when the plug body 11 continues to enter against the elastic force of the elastic member 13 provided in the plug body 11, the plug body tip 12a enters the outer peripheral surface of the partition wall 60 of the socket valve 23A.

  Then, as shown in FIG. 9, the engagement groove 43 of the plug body 11 engages with the ball 42 of the socket valve 23 </ b> A, and the end face of the plug body 11 is formed on the outer peripheral side of the partition wall 60. Abut. The contact portion F between the end surface of the plug body 11 and the recessed surface 60a on the outer peripheral side of the partition wall portion 60 is in contact with the contact portion G between the surface of the plug valve tip portion 12a and the inner cylinder tip portion 22a. 11 in the approach direction, the position is shifted to the proximal end side of the socket body 21.

  When the plug body 11 continues to enter, the elastic member 13 in the plug body 11 is further compressed, and the socket valve 21 and the contact portion F are moved by the plug body 11, so that the socket valve 23A and the inner cylinder flange portion 22b. The elastic member 24 between them is compressed and deformed. The ball 42 of the socket valve 23 </ b> A comes out of the escape groove 44 of the socket body 21 while being engaged with the engagement groove 43 of the plug body 11.

  Finally, as shown in FIG. 10, the ball 32 of the socket main body 21 is engaged with the engagement groove 33 of the plug main body 11, and the position of the plug main body 11 that enters is restricted. When the ball 32 moves to the inner peripheral side, the elastic return force of the elastic member 35 provided on the operation sleeve 34 acts, and the operation sleeve 34 is moved to the distal end side of the socket body 21. Then, the escape groove 34a at the distal end of the operation sleeve 34 is engaged with a stopper 36 provided on the outer peripheral surface of the distal end portion of the socket body 11, and further movement of the operation sleeve 34 is restricted.

  The socket body 21 is pushed by the entry of the plug body 11, and the position of the partition wall portion 60 that has been overlapped with the outer peripheral surface of the inner cylinder front end portion 22a is shifted to the proximal end side of the socket body 21 so that the recess 22d of the inner cylinder 22A is formed. Reach the facing open position. As a result, one end of the recess 22 is opened, and the communication hole 12b of the plug valve 11 and the communication hole 22c of the inner cylinder 22A communicate with each other through an opening formed in the plug body 11. Therefore, the communication path R is formed between the plug 1 and the socket 2, and the fluid can be guided here.

  When the plug 1 and the socket 2 are separated from each other, the seal ring 15 that seals between the plug main body 11 and the plug valve 12 is in an inserted / connected state of the plug 1, and the outer periphery of the socket valve partition wall 60. The seal changes between the surface and the inner peripheral surface of the tip end portion of the plug body 11.

  In the connected state of the plug 1 and the socket 2, the contact portion F between the end surface of the plug body 11 and the socket valve recessed surface 60a is connected to the socket valve 23A so that the fluid communicates therewith. Isolated from R.

  Further, in the process of separating the plug 1 and the socket 2 from the connected state, that is, in the process of moving from the state shown in FIG. 10 to the state shown in FIG. 9, the contact part F, the plug valve tip 12a surface, and the inner cylinder tip The position of the contact portion G on the 22a surface is shifted. Therefore, the fluid that has been flowing through the communication path R until then does not enter between the plug body 11 and the socket valve partition wall 60, and as a result, does not reach the contact portion F. When the socket 2 is separated, the dripping area of the abutting portion F between the end face of the tip end of the plug body 11 and the socket valve recessed surface 60a can be prevented, and the dripping area can be further reduced.

  The socket valve 23A is provided with a partition wall portion 60. The partition wall portion 60 is slidably fitted to the peripheral surface of the inner cylinder tip portion 22a, and the seal ring 15 is interposed between the sliding surfaces of each other, whereby the socket valve 23A tip portion It is not necessary to provide a seal ring (a seal ring corresponding to either the seal 27 or 28 shown in FIG. 1). That is, if the configuration of this embodiment is adopted, the number of seal rings can be reduced to reduce the parts cost and the installation labor, thereby contributing to the cost reduction.

  When the plug 1 and the socket 2 are separated, the plug body 11 is moved in the direction of leaving. In the middle of this, the seal ring 15 provided on the inner peripheral surface of the distal end portion of the plug main body 11 is in sliding contact with the outer peripheral surface of the partition wall 60, wipes off the fluid particles adhering to the outer peripheral surface, and helps to further suppress dripping.

  The operation sleeve 34 does not have to be pulled by hand when the plug body 11 is inserted into the socket body 21 or when the plug 1 and the socket 2 are separated. Since it moves automatically with the operation, there is no troublesome operability. Further, when the plug 1 and the socket 2 are connected and separated, there is a type in which the operation sleeve 34 is once pulled and operated, but this type is general and can be applied to all the embodiments.

  11 and 12 are partially cutaway front views showing the pipe joint in the fifth embodiment. FIG. 11 shows a state in which the plug 1 and the socket 2 are separated. FIG. 12 shows a state in which the plug 1 and the socket 2 are connected. Respectively. 11 and 12, the same parts as those in FIGS. 8 to 10 are denoted by the same reference numerals.

  Here, the sealing means S is provided at the contact portion G between the end surface 12a of the plug valve 12 constituting the plug 1 shown in FIG. 12 and the end surface 22a of the inner cylinder 22A constituting the socket 2. It is a feature.

  As a specific structure of the sealing means S, it is conceivable to provide packing or to form a combination of a convex portion and a concave portion. 11 and 12, a packing 70 is applied as the sealing means S. That is, for example, a groove portion 71 having a dovetail cross section is formed in an annular shape on the end surface of the distal end portion 12 a of the plug valve 12, and the packing 70 is attached to the annular groove 71. Naturally, as shown in FIG. 11, a part of the packing 70 protrudes from the end face of the plug valve tip 12a.

  As shown in FIG. 12, in a state where the plug 1 and the socket 2 are connected, the packing 70 provided on the end face of the plug valve tip 12a comes into contact with the end face 22a of the socket inner cylinder 22A and seals the end faces. None Prevents ingress of fluid.

  Further, as the sealing means S, a specific structure in which a concave portion and a convex portion are formed and combined is not particularly shown. For example, an annular ridge portion having a triangular cross section on the end surface of the inner cylinder front end portion 22a. Are formed integrally, and a circular groove-shaped portion is preferably provided on the end face of the plug valve tip portion 12a. When the plug 1 and the socket 2 are connected, the protrusion of the inner cylinder 22A fits into the groove of the plug valve 12, and the inclined surface of the protrusion contacts the edge of the groove to provide a reliable seal. Make.

Alternatively, a disc-shaped convex portion may be formed on the end surface of the inner cylinder 22A, and a disc-shaped concave portion may be formed on the end surface of the plug valve 12, so that both are combined.
In addition, this invention is not limited to embodiment mentioned above, It can implement by changing variously.

The partially notched front view which shows the pipe joint in the 1st Embodiment of this invention. The partially notched front view which shows the pipe joint in the embodiment. The partially notched front view which shows the pipe joint in the embodiment. The partially notched front view which shows the pipe joint in 2nd Embodiment. The partially notched front view which shows the pipe joint in 3rd Embodiment. The partially notched front view which shows the pipe joint in the embodiment. The partially notched front view which shows the pipe joint in the embodiment. The partially notched front view which shows the pipe joint in 4th Embodiment. The partially notched front view which shows the pipe joint in the embodiment. The partially notched front view which shows the pipe joint in the embodiment. The partially notched front view which shows the pipe joint in 5th Embodiment. The partially notched front view which shows the pipe joint in the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Plug, 2 ... Socket, 11 ... Plug main body, 12 ... Plug valve, 13 ... Elastic member, 14 ... Spring receiver, 15 ... Seal ring, 16 ... Seal ring, 21 ... Socket main body, 22 ... Inner cylinder, 23 ... Socket valve, 24 ... elastic member, 26 ... stopper, 27 ... seal ring, 28 ... seal ring, 29 ... seal ring, 31 ... ball holding hole (fixing means), 32 ... ball (fixing means), 33 ... engagement groove (Fixing means), 34 ... operation sleeve (fixing means), 35 ... elastic member (fixing means), 36 ... stopper (fixing means), 37 ... relief groove (fixing means), 41 ... ball holding hole (coupling means), 42 ... ball (connection means), 43 ... engagement groove (connection means), 44 ... escape groove (connection release means), 101 ... pipe, 102 ... pipe.

Claims (3)

A plug body having both ends open, a closed position in which the front end of the plug body is abutted and closed inside the plug body, and the distal end of the plug body is separated from the closed position toward the proximal end of the plug body A plug valve provided so as to be movable between an open position for opening the opening and an elastic member for applying a force toward the closed position with respect to the plug valve;
A socket body in which both end portions are opened and the plug body is inserted into the inside through a distal end opening, and a communication hole provided inside the socket body so as to communicate with the base end opening of the socket body and communicate with the inside and outside. And when the plug main body is inserted into the socket main body and moves in the direction of entry, the end face of the front end abuts on the end face of the front end of the plug valve and moves the plug valve from the closed position to the open position. An inner cylinder to be moved, a closed position where the communication hole is closed on the outer periphery of the inner cylinder, and an open position where the communication hole is spaced apart from the closed position on the base end side of the socket body. When the plug main body is inserted into the socket main body and moves in the direction of entry, the end face of the front end abuts on the end face of the plug main body. A socket having a resilient member for applying a force toward the closed position relative to the socket valve and the socket valve which is moved toward the open position from the closed position by,
When the plug body is inserted into the socket body and moves in the direction of entry, the plug valve is located in the open position and the plug body is located with respect to the socket body at the position where the socket valve is located in the open position. Fixing means for detachably fixing,
Connecting means for connecting the plug main body and the socket valve when the plug main body is inserted into the socket main body and moving the socket valve integrally when the plug main body moves in a retreating direction;
When the plug body moves together with the socket valve in a direction of retreating from the inside of the socket body, the plug body by the connecting means is located at a position where the plug valve is located in the closed position and the socket valve is located in the closed position. A pipe joint comprising a connection release means for releasing the connection with the socket valve. A plug body having both ends open, a closed position in which the front end of the plug body is abutted and closed inside the plug body, and the distal end of the plug body is separated from the closed position toward the proximal end of the plug body A plug valve provided so as to be movable between an open position for opening the opening and an elastic member for applying a force toward the closed position with respect to the plug valve;
A socket body in which both end portions are opened and the plug body is inserted into the socket body through the distal end opening. The socket body is provided in the socket body so as to communicate with the proximal end opening of the socket body. In addition to having a communication hole that communicates with the inside and the outside at a separated location, the outer peripheral part between the communication hole and the tip has a recess that opens the communication hole, and the plug body is an interior of the socket body. An inner cylinder that makes the tip end face abut against the tip end face of the plug valve and moves the plug valve toward the open position when it moves in the direction of entering the plug valve, forms an annular shape, and makes the plug body tip from the tip end face The plug main body extends toward the side and overlaps the outer peripheral surface of the distal end portion of the inner cylinder and moves when the plug main body is inserted and moved into the socket main body. A closed position where the partition wall overlaps with the inner peripheral surface of the tip, and the partition wall surrounds and contacts the outer periphery of the inner cylinder, and an open position facing the recess. When the plug main body is inserted into the socket main body and moves in the direction of entry, the plug main body comes into contact with the end surface of the tip of the plug main body and is moved from the closed position to the open position. A socket provided with a socket valve, and an elastic member that applies force to the socket valve toward the closed position;
When the plug body is inserted into the socket body and moves in the direction of entry, the plug valve is located in the open position and the plug body is located with respect to the socket body at the position where the socket valve is located in the open position. Fixing means for detachably fixing,
Connecting means for connecting the plug main body and the socket valve when the plug main body is inserted into the socket main body and moving the socket valve integrally when the plug main body moves in a retreating direction;
When the plug body moves together with the socket valve in a direction of retreating from the inside of the socket body, the plug body by the connecting means is located at a position where the plug valve is located in the closed position and the socket valve is located in the closed position. A pipe joint comprising a connection release means for releasing the connection with the socket valve. The connecting means forms overlapping portions on the socket valve and the plug body on the outer peripheral side and the inner peripheral side, respectively, forms a hole penetrating in the radial direction in the overlapping portion of the socket valve, and overlaps the plug body An engaging portion is formed opposite to the hole in the portion, a ball is provided in the socket valve hole so as to be movable along a radial direction of the socket valve, and the ball is formed on the inner peripheral surface of the socket body. The ball is prevented from moving from the hole to the outer peripheral side of the socket valve, and the ball is protruded to the inner peripheral side of the socket valve to be engaged with the engaging portion of the plug body.
The connection release means forms an escape portion facing the hole of the socket valve on the inner peripheral surface of the socket body at a location where the connection between the plug body and the socket valve by the connection means is released. The ball provided in the hole of the socket valve at the escape portion is allowed to move from the hole to the outer peripheral side of the socket valve, and the engagement with the engaging portion of the plug body is released. The pipe joint according to any one of claims 1 and 2, wherein the pipe joint is characterized.

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