JP5581525B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint having a socket and a plug that connect pipes through which a fluid such as a liquid flows and are coupled to each other.

  2. Description of the Related Art Conventionally, as a pipe joint for connecting pipes (pipe lines) through which a fluid such as a refrigerant flows, for example, a pipe joint having a socket and a plug coupled to each other is known (for example, the following patent document) 1). In this pipe joint, a fluid passage that allows fluid to flow is provided inside the main bodies of the socket and the plug, and an opening / closing valve for opening and closing the fluid passage is provided inside the fluid passage.

  An operation shaft that moves in the axial direction in accordance with the operation of the rotatable knob and a seal ring attached to the operation shaft are provided inside the fluid passage in the socket body. A sleeve valve having a conical valve seat that contacts the seal ring and a compression spring that applies a force to the sleeve valve in a direction toward the injection port are provided.

  With such a configuration, in the pipe joint of Patent Document 1, even when the rotatable knob is closed so that the operating shaft moves in the opening direction of the seal ring without the plug being connected to the socket body, the compression is compressed. A structure in which the conical valve seat of the sleeve valve is kept in contact with the seal ring of the operating shaft by the action of the spring is realized. For this reason, the fluid passage is not opened when the plug is not connected, and inadvertent fluid leakage in such a case is prevented.

Japanese Patent No. 2781463

  However, the conventional pipe joint disclosed in Patent Document 1 described above has a structure in which the sleeve valve is pressed only in one direction by one compression spring and the conical valve seat is brought into contact with the seal ring. For this reason, for example, when the rotary knob is closed with the plug and socket not connected, and the force of the compression spring becomes weak, it acts on the pipe joint due to the backlash in the axial direction of the operating shaft. There is a risk that the contact state between the conical valve seat and the seal ring cannot be stably maintained with respect to external vibration and impact, or pressure fluctuation of the fluid in the fluid passage.

  The present invention eliminates the problems caused by the prior art described above, so that the on-off valve can be stably opened and closed, and a pipe joint that can reliably prevent fluid leakage when the on-off valve is closed. The purpose is to provide.

In order to solve the above-described problems and achieve the object, a pipe joint according to the present invention is a pipe joint having a socket and a plug coupled to each other, and the socket has one end portion into which the plug is inserted and fitted. A socket body having an open cylindrical shape, an opening / closing valve mounted inside the socket body, and a valve operating means provided at the other end of the socket body for opening / closing the opening / closing valve; Connection operation means for operating connection or disconnection of the socket and the plug, the socket body is provided at the one end, a connection port into which the plug is inserted, and the connection A fluid passage formed along the axial direction of the socket body from the mouth, and a pipe connection means formed with a fluid flow hole communicating with the fluid passage along the radial direction of the socket body, The on-off valve has a rod-shaped valve shaft provided inside the fluid passage so as to be movable back and forth along the axial direction between a valve open position and a valve close position, and a valve shaft on the connection port side of the valve shaft. A first valve body that is attached to a peripheral wall and moves forward and backward along the axial direction together with the valve shaft, and the fluid passage is closed by contacting or separating from the first valve body inside the fluid passage Alternatively, it is provided so as to be openable and retractable along the axial direction so that it can be opened, and when the plug is completely inserted into the connection port, it is in contact with the first valve body by contacting the tip of the plug. A second valve body that is prevented from moving , and a force that is in a direction in contact with the first valve body with respect to the second valve body and in a direction in which the valve shaft is separated from the valve operating means. and a first elastic member, said valve operating means, the axial pre Kibenjiku A valve operating member that is displaceable so as to move forward and backward between the valve opening position and the valve closing position along the direction in which the valve operating member comes into contact with the valve shaft, and the first valve A second elastic member that applies a larger force than the first elastic member in a direction in which the body comes into contact with the second valve body, and the connection operation means is provided on a peripheral wall of the connection port. An engagement body that is supported by the socket body in a state of being detachably engaged with the plug inserted into the connection port, and provided on the outer peripheral side of the peripheral wall of the connection port. And a connection operation member having an annular shape that is displaced between a connection holding position that holds the engagement body in a state of being engaged with the plug and a connection release position that releases the engagement body from the engagement state with the plug. And

  In one embodiment of the present invention, the valve operating member includes a rotating shaft provided in the socket body in a direction perpendicular to the central axis of the valve shaft, and a rear shaft mounted on the rotating shaft. A cam-like abutting portion that abuts on the end, and an operating lever for rotating the abutting portion about the rotation axis. The operating lever is in contact with the socket when the socket and the plug are coupled. When the valve shaft is moved to the valve open position at the contact portion, the distal end portion is disposed at a position that restricts movement of the connection operation member from the connection holding position to the connection release position.

  In another embodiment of the present invention, the valve operating member has a contact portion that is screwed to the socket body in a state of having a screwing shaft along the axial direction and contacts the valve shaft. A disc-shaped operation dial, wherein the contact portion rotates and displaces about the screw shaft in accordance with an operation of moving the valve shaft between the valve opening position and the valve closing position; The dial is configured such that when the socket and the plug are coupled, when the valve shaft is moved to the valve open position by the contact portion, the tip portion moves from the connection holding position of the connection operation member to the connection release position. It is arranged at a position that restricts movement.

  In still another embodiment of the present invention, the valve operation member and the connection operation member are configured such that the plug is completely inserted into the connection port, the connection operation member is moved to the connection holding position, and the valve When the shaft is moved to the valve-opening position, both ends thereof are close to each other at a distance shorter than the displacement amount of the connection operation member from the connection holding position to the connection release position of the connection operation member. Connection locking means for preventing displacement to the connection release position and locking the connection state of the plug is configured.

  In still another embodiment of the present invention, the engagement body is movable along the radial direction in a support hole formed in the peripheral wall of the connection port so as to narrow from the outer peripheral side toward the radial inner side. And a spherical body that is detachably engaged with a groove-like engagement portion formed in the plug, and the connection operation member is configured to connect the spherical body to the tip side of the socket body. It can be displaced in a state where it is pressed so as to protrude from the outer peripheral side toward the radially inner side at the connection holding position, and is pressed so as not to protrude at the connection release position on the rear end side of the socket body. And the force of the direction to the said connection holding position is provided by the 3rd elastic member.

  In still another embodiment of the present invention, the pipe connection means includes a swivel joint connected to the fluid introduction side of the fluid circulation hole.

  According to the present invention, the opening / closing operation of the opening / closing valve can be stably performed, and fluid leakage when the opening / closing valve is closed can be reliably prevented.

It is a side view which shows a part in a mode at the time of separation of a socket and a plug in a pipe joint concerning a 1st embodiment of the present invention. It is A arrow directional view of FIG. It is a side view which shows a part in the mode at the time of isolation | separation of the socket and plug in the same pipe joint. It is a side view which shows a part in the mode at the time of the connection of the socket and plug in the same pipe joint. It is a side view which shows a part in a mode at the time of connection of a socket and a plug in a pipe joint concerning a 2nd embodiment of the present invention. It is a side view which shows a part in a mode at the time of connection of a socket and a plug in a pipe joint concerning a 3rd embodiment of the present invention. It is a side view which shows a part in a mode at the time of connection of a socket and a plug in a pipe joint concerning a 4th embodiment of the present invention.

  Embodiments of a pipe joint according to the present invention will be described below in detail with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 is a side view partially showing in cross section a state of a socket and a plug in the pipe joint according to the first embodiment of the present invention when separated. FIG. 2 is a view taken in the direction of arrow A in FIG. As shown in FIG. 1, the pipe joint according to the first embodiment includes a cylindrical socket 1 and a cylindrical plug 2 that is detachably inserted into the socket 1.

  This pipe joint includes, for example, a conduit for circulating a fluid such as a refrigerant used in heating and cooling equipment such as an automotive air conditioner and a hot water supply heat pump, and a refrigerant supply for supplying and recovering the refrigerant to the heating and cooling equipment. Used to connect the recovery source. The plug 2 is connected to, for example, a service port (not shown) on the heating / cooling device side. The socket 1 includes a socket body 3 and an on-off valve 40 provided inside the socket body 3.

The socket body 3 is configured by, for example, connecting a main body (first cylinder) 10 and a connection port body (second cylinder) 20 in the axial direction. The socket body 3 has a fluid passage 30 through which a fluid flows while forming a cylindrical body with one end (the end on the plug 2 side) opened. The on-off valve 40 is provided in the fluid passage 30 of the socket body 3.

  Further, the socket 1 is operated to operate the valve operating means 60 for opening and closing the on-off valve 40 and the connection of the plug 2 inserted into the socket 1 into the socket 1 or the disconnection of the plug 2 from the socket 1. And a connection operation means 21 for doing so. Further, the socket body 3 of the socket 1 is formed with a pipe connecting portion (pipe connecting means) 12 extending in the radial direction intersecting the axial direction of the main body 10.

  The pipe connection part 12 connects, for example, a pipe (pipe) from a refrigerant supply / recovery source (not shown) to the socket body 3, and fluid that communicates with the fluid passage 30 of the main body 10 in the radial direction of the socket body 3. A circulation hole 11 is formed.

  The main body 10 of the socket body 3 forms a cylindrical body whose front end on the connection port body 20 side is open. An annular valve body (second valve body) 42 of an on-off valve 40 described later is inserted into the connection hole 13 opened at the front end of the main body 10. Further, the insertion hole 14 at the rear end (on the side of the valve operating means 60) of the main body 10 is closed by a valve shaft support body 44 described later and a valve shaft 43 supported thereby.

  The connection port body 20 of the socket body 3 is open at both ends and forms a cylindrical body having a larger diameter than the main body 10, and the rear end side is screwed with the outer peripheral surface of the front end portion of the main body 10. Further, on the front end side of the connection port body 20, a connection port 22 that communicates with the fluid passage 30 of the main body 10 and into which the plug 2 is inserted is provided.

  The on-off valve 40 opens and closes the fluid passage 30 in the fluid passage 30 of the socket body 3. The on-off valve 40 is a valve provided inside the fluid passage 30 so as to be able to advance and retreat along the axial direction of the socket body 3 between a valve opening position where the valve is opened and a valve closing position where the valve is closed. A shaft 43 is provided.

  The on-off valve 40 includes a seal ring (first valve body) 41 that is attached to the peripheral wall of the valve shaft 43 on the connection port body 20 side and moves forward and backward along the axial direction together with the valve shaft 43. Furthermore, the on-off valve 40 is provided inside the fluid passage 30 so as to be movable back and forth along the axial direction so as to be able to close or open the fluid passage 30 by contacting or separating from the seal ring 41 and to which the plug 2 is connected. An annular valve body (second valve body) 42 is provided which is brought into contact with the distal end portion of the plug body 4 of the plug 2 and is prevented from moving in a direction to contact the seal ring 41 when fully inserted into the opening 22.

  Further, the on-off valve 40 includes a valve spring (first elastic member) 45 that applies a force in a direction to contact the seal ring 41 to the annular valve body 42. The valve shaft 43 is made of a rod-like member that is longer in the axial direction than the fluid passage 30 of the main body 10, and is disposed on the central axis inside the fluid passage 30.

  The valve shaft 43 is supported by the insertion hole 14 of the main body 10 via a valve shaft support body 44 mounted at the rear end portion, and can move forward and backward along the axial direction by the operation and action of the valve operating means 60. However, the tip portion is formed so as to extend to the inside of the connection port body 20. A pair of notch recesses 46 extending in the axial direction, for example, are formed on the peripheral wall of the valve shaft 43 on the rear end side with respect to the location where the seal ring 41 is attached.

  The pair of cutout recesses 46 form a gap that is connected to the fluid passage 30 with the inner peripheral surface 42a on the front end side of the annular valve body 42 at the valve opening position as described above. The seal ring 41 is formed by molding a sealing material such as rubber in an annular shape. The seal ring 41 is disposed on the front end side of the pair of notch recesses 46 of the valve shaft 43 and is formed in an annular groove 41 a formed on the outer peripheral surface of the valve shaft 43. The fitting is fixed.

  Further, the seal ring 41 is held at its front end surface by a protruding portion 41b formed on the front side in the axial direction of the annular groove 41a, and is attached to the valve shaft 43 by fitting from the front end side. The outer peripheral surface is pressed by. Therefore, the seal ring 41 moves forward and backward in the axial direction of the socket body 3 together with the valve shaft 43. The rear end surface of the seal ring 41 is in contact with the stepped surface between the front inner peripheral surface and the rear inner peripheral surface of the annular valve body 42 and shuts off and closes the fluid passage 30 in the pipe joint. Configure.

  The annular valve body 42 has a cylindrical shape surrounding the outer periphery of the valve shaft 43 and the seal ring 41, and is disposed so as to be movable forward and backward in the axial direction over the inside of the main body 10 and the connection port body 20 in the socket body 3. Yes. The rear portion of the annular valve body 42 is inserted into the connection hole 13 of the main body 10 such that the outer peripheral surface thereof is slidable with the inner peripheral surface of the connection hole 13 of the main body 10. Further, the inner peripheral surface of the rear portion of the annular valve body 42 is configured to be slidable with a portion including the pair of notch recesses 46 of the valve shaft 43.

  The front part of the annular valve body 42 has an outer peripheral surface that is larger in diameter than the outer peripheral surface of the rear part, and a step surface 42b is formed along the radial direction between the front part and the rear part. The outer peripheral surface of the front part of the annular valve body 42 is located inside the connection port body 20 and is combined so as to be in sliding contact with the inner peripheral surface of the ball receiving annular body 23 of the connection operation means 21 described later.

  Further, the front portion of the annular valve body 42 accommodates the seal ring 41 and the seal fixing body 41c therein. The stepped surface 42b of the annular valve body 42 is in contact with the tip surface of the main body 10, whereby the backward movement of the annular valve body 42 is restricted. In such an on-off valve 40, the seal ring 41 and the annular valve body 42 come into contact with each other at a position in front of the pair of notch recesses 46, whereby the fluid passage 30 in the valve closing position is blocked.

  Furthermore, the distal end surface of the annular valve body 42 is a position where the distal end surface of the plug body 4 comes into contact with the distal end side of the valve shaft 43 when the plug 2 is completely inserted into the connection port 22 as will be described later. The dimensions are set so as to be arranged (for example, see FIG. 4). A seal ring 42 c is attached to the outer peripheral surface of the rear portion of the annular valve body 42 so as to seal the inner peripheral surface side of the fluid passage 30 between the main body 10 and the connection hole 13.

  As described above, the valve shaft support body 44 is formed of a cylindrical body movably provided at the rear portion of the fluid passage 30 of the main body 10 and has a structure in which the rear end portion of the valve shaft 43 is inserted and supported at the center thereof. The valve shaft support body 44 engages with a stopper ball 47 fitted in a recess 43 a formed on the rear outer peripheral surface of the valve shaft 43 by a pressing piece 44 c formed on the rear side. The valve shaft support body 44 is integrally coupled to the valve shaft 43 by the stopper ball 47 being pressed by a cap 48 fitted from the rear end side.

  In addition, seal rings 44a and 44b are respectively disposed on the inner peripheral surface and the outer peripheral surface of the valve shaft support body 44, and between the rear outer peripheral surface of the valve shaft 43 and the inner peripheral surface of the insertion hole 14 of the main body 10. A seal on the inner peripheral surface side of the fluid passage 30 between them is shown.

  The valve spring 45 is formed of, for example, a compression coil spring, and is disposed on the rear side of the annular valve body 42. The valve spring 45 has a concave surface at the rear end of the annular valve body 42 and a front end surface of the spring receiving ring ridge 15 formed on the inner peripheral surface of the fluid passage 30 of the main body 10 on the front side of the insertion hole 14. And is supported by.

  The valve spring 45 applies a force in a direction in contact with the seal ring 41 to the annular valve body 42 along the axial direction of the valve shaft 43 (that is, a force toward the front end side of the socket body 3). Thereby, the annular valve body 42 is moved forward and brought into contact with the seal ring 41. For this reason, the seal ring 41 and the annular valve body 42 come into contact with each other, the on-off valve 40 is closed, and the fluid passage 30 of the socket body 3 is partitioned into the front side and the rear side and closed.

  On the other hand, as shown in FIGS. 1 and 2, the valve operating means 60 is provided on the rear end side with respect to the insertion hole 14 of the main body 10 of the socket body 3, and performs an operation for opening and closing the on-off valve 40. Is. The valve operation means 60 includes an operation lever (valve operation member) 61 that can be displaced so as to move the valve shaft 43 forward and backward between the valve open position and the valve close position along the axial direction.

  The operation lever 61 has a base end portion fixed to a rotating shaft 64 that passes through a pair of mounting pieces 63 disposed opposite to the side surface of the rear end portion of the main body 10 in a direction perpendicular to the axial direction of the main body 10, and rotates. The shaft 64 is provided to be rotatable.

  Each of the pair of attachment pieces 63 has a flat inner surface facing the axial direction, and a shaft hole 64a is formed on a diameter line orthogonal to the inner surface. The rotating shaft 64 is rotatably attached to the shaft hole 64a. A cam portion (contact portion) 62 that contacts the rear end portion of the valve shaft 43 in accordance with the operation of the operation lever 61 is disposed between the pair of attachment pieces 63. Therefore, the operation lever 61 is arranged so that its longitudinal direction can rotate around the rotation shaft 64 along a plane parallel to the inner side surface.

  The operation lever 61 is a portion that is manually operated by the operator of the pipe joint. When the operation lever 61 is operated and operated, the cam portion 62 connected via the rotation shaft 64 is connected to the valve shaft. 43 abuts. Thereby, the valve shaft 43 can be moved in the axial direction between the valve opening position and the valve closing position.

  The cam portion 62 is formed with a cam surface in which the lower portion surface 62a and the higher portion surface 62b intersect each other at right angles to each other through an arc corner portion on the outer peripheral portion. The distance from the center of the shaft hole 64a is set such that the distance from the center of the shaft hole 64a is such that the valve shaft 43 can move backward to the valve closing position, and the distance from the center of the shaft hole 64a is 43 is set to a length that allows the valve shaft 43 to move forward to the valve opening position by pressing the rear end surface of the valve 43.

  As shown in FIGS. 1 and 2, when the operation lever 61 is in the upright position so that the longitudinal direction thereof intersects the axial direction of the socket body 3, the cam portion 62 has a lower surface 62 a at the rear of the valve shaft 43. Opposes in close proximity to the end face. On the other hand, when the operation lever 61 is tilted from the upright position so that the front end thereof faces the front of the socket body 3 as shown in FIG. 3, the arc corner of the cam surface slides on the rear end surface of the valve shaft 43. Then, the valve shaft 43 is gradually moved forward.

  Then, as shown in FIG. 4, when the operation lever 61 is tilted so that the longitudinal direction thereof is parallel to the axial direction of the socket body 3, the cam portion 62 has a high portion surface 62 b and a rear end surface of the valve shaft 43. It contacts the cap 48. As a result, the valve shaft 43 is pressed forward. That is, when the operation lever 61 is in the upright position, the valve shaft 43 is allowed to move backward and the valve 40 is closed. When the operating lever 61 is in the parallel position, the valve shaft 43 moves forward to the foremost position to open the on-off valve 40.

  Further, an operating spring (second elastic member) 65 is disposed in the fluid passage 30 of the main body 10 so as to surround the valve shaft 43 on the front side of the valve shaft support body 44. The actuating spring 65 is formed of, for example, a compression coil spring, and is supported by the front end peripheral edge step portion of the valve shaft support body 44 and the rear end face of the spring receiving ring protruding portion 15.

  Since the operating spring 65 applies a force in the backward direction (rear side) to the valve shaft support body 44, the valve shaft 43 supported by the valve shaft support body 44 is always retracted by the operating spring 65. It is receiving the force that goes in the direction. The spring force of the operating spring 65 is set larger than the spring force of the valve spring 45.

  The connection operation means 21 employs, for example, a mechanism called a general ball lock mechanism, and in this embodiment, a one-touch system that can be connected by a single operation of inserting the plug 2 into the socket body 3 is employed. Has been. The connection operation means 21 is provided on a peripheral wall constituting the connection port 22 of the connection port body 20, and a plurality of balls (engagement bodies) supported by the socket body 3 so as to be engageable with the plug 2 inserted into the connection port 22. 51 is provided.

  The connection operating means 21 is provided on the outer peripheral side of the peripheral wall constituting the connection port 22 of the connection port body 20, and a connection holding position for holding the ball 51 in a state of being engaged with the plug 2. An annular operation sleeve (connection operation member) 53 that moves forward and backward from the connection release position that is removed from the engaged state is provided.

  Each ball 51 is radially arranged in a plurality of ball support holes 50 formed in the circumferential wall at a predetermined interval in the circumferential direction so as to narrow radially inward from the outer circumferential side on the circumferential wall on the front end side of the connection port body 20. It is supported so that it can move along. The inner periphery side opening of each ball support hole 50 is formed smaller than the diameter of the ball 51 and the outer periphery side opening is formed larger than the diameter of the ball 51, whereby the ball 51 partially protrudes from both side openings of the ball support hole 50. Thus, the connecting port body 20 is supported so as to be movable in the radial direction.

  The operation sleeve 53 is mounted on the outer peripheral side of the connection port 20 so as to be movable in the axial direction. A front inner peripheral surface of the operation sleeve 53 constitutes a ball pressing surface 53a, and a ball relief groove 53b is formed in a front end inner peripheral edge continuous with the pressing surface 53a. The operation sleeve 53 is connected from the ball support hole 50 to the connection holding position that is a ball pressing position for pressing the ball 51 in each ball support hole 50 so as not to protrude to the outer peripheral side of the connection port body 20. The ball 51 protruding to the outer peripheral side of the mouth body 20 escapes to the ball escape groove 53b and can be moved forward and backward between the connection release position which is a ball escape position allowing the ball 51 to protrude and move to the outer peripheral side. Has been placed.

  The operation sleeve 53 is formed by a sleeve spring 54 formed of a compression coil spring provided between a stepped portion that extends from the ball pressing surface 53a to the rear end side and a stepped portion formed on the outer peripheral side of the connection port body 20. A force is applied toward the front side of the connection port body 20. As a result, the operation sleeve 53 is pushed by the sleeve spring 54 so that the front end portion thereof can move forward toward the connection holding position beyond the ball support hole 50, and is attached to the outer peripheral side of the front end portion of the connection port body 20. The forward movement beyond the connection holding position is regulated by the stopper ring 55.

  In addition, the above-described ball receiving ring body 23 is arranged inside the connection port 22 of the connection port body 20, and the ball receiving ring body 23 moves in the axial direction between the connection port body 20 and the main body 10. It is supported freely. A ball receiving protrusion 23 a is formed at the tip of the ball receiving annular body 23 so as to protrude forward.

  The ball receiving annular body 23 is constantly applied with a force toward the front end side by an annular body spring 24 composed of a compression coil spring disposed between the step portion on the rear end side and the step portion on the front end side of the main body 10. It has been. The ball receiving annular body 23 is configured such that a stepped portion on the outer peripheral side continuous from the ball receiving projection 23a comes into contact with a stopper formed of a stepped portion formed on the rear side of the ball support hole 50 of the connection port body 20. Forward movement is regulated.

  Then, in a state where the ball receiving annular body 23 is in contact with the stopper, the outer peripheral surface of the ball receiving protrusion 23 a is located at a location (ball receiving position) facing the inner peripheral side opening of each ball support hole 50. That is, the ball receiving annular body 23 is provided so as to be movable forward and backward between the ball receiving position and the ball standby position on the rear side.

  When the ball receiving annular body 23 is in the ball receiving position, the ball 51 supported in each ball support hole 50 is received by the outer peripheral surface of the ball receiving protrusion 23 at a portion protruding from the inner peripheral opening. As a result, the protrusion of the ball 51 from the inner peripheral side opening is prevented, and the ball 51 moves outward in the radial direction of the connection port body 20 and protrudes from the outer peripheral side opening of the ball support hole 50.

  In this state, in the operation sleeve 53, the ball relief groove 53b formed in the inner peripheral edge of the front end receives and abuts the ball 51 protruding from the ball support hole 50, and the forward movement is prevented and the rear end of the connection holding position. It is structured to stop at the connection release position on the side. That is, the operation sleeve 53 has a structure in which each ball 51 protruding outward in the radial direction from the ball support hole 50 is escaped by the ball escape groove 53b.

  As shown in FIGS. 1 and 3, the connection operation means 21 configured in this way does not connect the plug 2 to the socket 1 (that is, plugs into the connection port 22 of the connection port body 20 of the socket body 3. In the non-connected state (2 is not completely inserted), the ball receiving annular body 23 moves forward and moves to the ball receiving position, and the operation sleeve 53 moves backward to move to the connection releasing position.

  Further, as shown in FIG. 4, when the plug 2 is connected to the socket 1 (that is, the plug 2 is completely inserted into the connection port 22 of the connection port 20 of the socket body 3), The annular body 23 is pushed by the plug 2 and moves backward to move to the ball standby position, and the operation sleeve 53 moves forward to move to the connection holding position. Seal rings 25 and 26 are provided on the inner peripheral portion of the ball receiving annular body 23 to perform sealing with the plug 2 inserted inside the ball receiving annular body 23.

  In the pipe joint of this embodiment, the operation lever 61 and the operation sleeve 53 constitute a connection lock means for locking the connection state of the plug 2 to the socket 1. When the plug 2 is completely inserted into the socket body 3 and the operation sleeve 53 is moved to the connection holding position, and the valve shaft 43 is moved to the valve opening position and the on-off valve 40 is opened. The operation sleeve 53 is prevented from being displaced to the connection release position.

  That is, as shown in FIG. 4, the connection lock means is such that the rear end portion of the operation sleeve 53 and the front end portion of the operation lever 61 are shorter than the displacement amount of the operation sleeve 53 from the connection holding position to the connection release position. It is realized by approaching. Specifically, in a state where the plug 2 is completely inserted into the socket body 3, the operation sleeve 53 of the connection operation means 21 moves forward, contacts the stopper ring 55, and stops at the connection holding position.

  At this time, each ball 51 supported by the ball support hole 50 of the connection port body 20 is pushed from the outer peripheral side to the inner peripheral side by the ball pressing surface 53 a of the operation sleeve 53. Then, the plug 2 is protruded from the opening on the inner peripheral side and engaged with an engagement groove 2 a formed on the outer peripheral portion of the plug 2, so that the inserted plug 2 is connected to the connection port body 20.

  On the other hand, in the valve operation means 60, the operation lever 61 is rotated from the upright position to the parallel position and tilted. Accordingly, the operation lever 61 is positioned on the rear side in the axial direction with respect to the operation sleeve 53 in the socket body 3 and is in a state of being aligned on the same axis. At this time, the on-off valve 40 is opened. In this state, the front end surface of the operation lever 61 and the rear end surface of the operation sleeve 53 are planes that are perpendicular to the axial direction, and these two planes face each other and face each other.

  In this state, as described above, the rear end portion (rear end surface) of the operation sleeve 53 and the front end portion (front end surface) of the operation lever 61 are displaced from the connection holding position of the operation sleeve 53 to the connection release position. Even close by a short distance. Accordingly, a force directed toward the rear side is applied to the operation sleeve 53 in the connection holding position for some reason, and even if the operation sleeve 53 tries to move backward, the rear end surface of the operation sleeve 53 immediately comes to the front end surface of the operation lever 61. The contact is prevented from moving backward and cannot move to the connection release position. That is, the operation of releasing the connection of the plug 2 by the operation sleeve 53 cannot be performed.

  For this reason, when the on-off valve 40 is opened by this connection lock means and the fluid is flowing through the fluid passage 30, the plug 2 is detached from the socket body 3 and the fluid leaks to the outside. Generation | occurrence | production can be prevented reliably and high safety | security can be provided.

  In order to detach the plug 2 from the socket body 3, the operating lever 61 is moved from the parallel position to the upright position, and the on-off valve 40 is closed. Then, the plug 2 can be detached from the socket body 3 by moving the operation sleeve 53 backward from the connection holding position to the connection release position.

  That is, the plug 2 can be removed from the socket body 3 for the first time after the operation lever 61 is operated to close the on-off valve 40. For this reason, it is possible to reliably prevent the occurrence of an accident or the like in which the plug 2 is detached from the socket body 3 and the fluid leaks to the outside while the on-off valve 40 is open.

  The connection locking means configured as described above is not realized by a specially prepared special product or the like, but can be realized by using the operation lever 61 and the operation sleeve 53 which are the configuration of the pipe joint of this embodiment as it is. Therefore, the number of parts can be reduced and the configuration can be made inexpensively. In order to realize the above configuration and operation of the connection lock means, the dimensions of the main body 10 and the connection port body 20 of the socket body 3, the dimensions of the operation sleeve 53 of the connection operation means 21 and the operation lever 61 of the valve operation means 60 are described. Etc. are set as appropriate.

  On the other hand, the plug 2 includes a plug body 4 having a cylindrical body whose both ends are opened in order to supply and collect a fluid such as a refrigerant to the heating and cooling device as described above. On the distal end side of the plug body 4, an inlet coupling portion 4 a that contacts the distal end portion of the annular valve body 42 and is coupled to the fluid passage 30 is formed.

  The plug 2 includes a movable valve 70 provided in the fluid passage 30 inside the plug body 4. The plug main body 4 has a diameter that allows the outer periphery of the front end to be inserted into the ball receiving annular body 23, and the outer peripheral portion on the rear side is the same as the outer diameter of the ball receiving projection 23 a of the ball receiving annular body 23. The protrusion 5 having an outer diameter large enough to be inserted into the connection port body 20 is configured. And the engagement groove | channel 2a mentioned above is formed in the back side of the protrusion part 5 of the plug main body 4. FIG.

  The movable valve 70 is composed of, for example, a known insect valve or a valve core, and although not shown in detail, a fixed valve body fixed to the plug body 4 and a fluid connected to the fixed valve body in a detachable manner. A movable valve body 71 that opens and closes the passage 30 and a valve spring that applies force to the movable valve body 71 in a direction in contact with the fixed valve body are configured.

  The operation of the pipe joint configured in this way is as follows. First, in the socket 1, the valve operating means 60 when the plug 2 is disconnected and the on-off valve 40 is closed is such that the operating lever 61 is in the upright position. And the lower surface 62 a of the cam portion 62 is positioned so as to face the rear end surfaces of the valve shaft 43 and the valve shaft support body 44.

  Accordingly, the backward movement of the valve shaft 43 is allowed, the valve shaft support body 44 is pushed by the operating spring 65 and moved backward together with the valve shaft 43, and the rear end face of the valve shaft 43 and the valve shaft support body 44 is the main body 10. It protrudes rearward from the opening of the insertion hole 14. At this time, when the fluid does not flow into the fluid passage 30 of the main body 10 from the fluid circulation hole 11 of the pipe connection portion 12, the rear end surfaces of the valve shaft 43 and the valve shaft support body 44 are low in the cam portion 62. It faces in a state where a predetermined gap is formed without contacting the part surface 62a. This is because of the following reason.

  That is, when the fluid flows into the fluid passage 30 of the main body 10, the valve shaft 43 and the valve shaft support body 44 try to move toward the rear side in the axial direction under the pressure of the fluid. Further, the annular valve body 42 tends to move toward the front side in the axial direction. In this case, the valve shaft 43 and the valve shaft support body 44 are displaced rearward so as to narrow the predetermined gap, and the annular valve body 42 compresses the seal ring 41 and is displaced forward, so that the seal ring 41 The annular valve body 42 maintains the closed state.

  Even if there is no predetermined gap between the rear end surface of the valve shaft 43 and the valve shaft support body 44 and the lower surface 62a of the cam portion 62 and both are in contact with each other, there is no particular problem. The received valve shaft 43 and the valve shaft support body 44 may be moved to the front side due to the reaction from the lower surface 62a of the cam portion 62 and away from the annular valve body 42. Therefore, the valve shaft 43 and the valve shaft It is more preferable to form a predetermined gap between the rear end surface of the support body 44 and the lower surface 62a of the cam portion 62.

  Next, in the on-off valve 40, the seal ring 41 is applied with a force toward the rear side by the spring force of the operating spring 65, and moves integrally with the backward movement of the valve shaft 43. It contacts the step surface of the body 42. Since the annular valve body 42 is pushed toward the front side by the spring force of the valve spring 45, it receives a force in the direction opposite to the force received by the seal ring 41 and contacts the seal ring 41. For this reason, according to the present embodiment, the seal ring 41 and the annular valve body 42 come into contact with each other with a contact pressure composed of a force obtained by combining the spring forces of the two springs.

  Here, since the actuation spring 65 is configured to have a larger spring force than the valve spring 45, the actuation spring 65 is more effective than the force by which the valve spring 45 tries to move the valve shaft 43 forward. The force to move the shaft 43 to the rear side wins. For this reason, in the socket 1 of the pipe joint according to this embodiment, the valve shaft 43 reliably and stably abuts on the cam portion 62 that follows the operation of the operation lever 61 when the on-off valve 40 is opened and closed.

  Thereby, the movement of the valve shaft 43, the contact and separation of the seal ring 41 and the annular valve body 42 can be stably performed, and the on-off valve 40 can be used for fluctuations in fluid pressure, external vibration, impact, etc. Therefore, the valve can be reliably contacted and maintained in a stable state with respect to the above factors, so that high reliability can be ensured.

  Note that the operation lever 61 of the valve operating means 60 is, for example, in the valve open position, the cam portion 62 by the valve shaft 43 and the rear end surface of the valve shaft support body 44 to which pressure is applied to the rear side by the operating spring 65. When the high portion surface 62b is pushed, the valve is stably held at the valve opening position stably and reliably. When the on-off valve 40 is in the closed state, the main body 10 side and the connection port body 20 side of the fluid passage 30 in the socket body 3 are reliably shut off by the on-off valve 40.

  In the connection operation means 21, when the operation sleeve 53 is in the connection release position (that is, when the plug 2 is not inserted into the socket body 3), the ball receiving annular body 23 is in the ball receiving position and the ball 51 is Projecting to the outer peripheral side of the connection port body 20. Accordingly, the operation sleeve 53 is prevented from moving forward by the ball 51 and stops at the connection release position.

  Thus, when the plug 2 is in a disconnected state, the opening / closing valve 40 cannot be opened even if the operation lever 61 is operated to open the opening / closing valve 40. That is, as shown in FIG. 3, when the operation lever 61 is rotated from the upright position toward the parallel position, the outer peripheral portion of the front end of the operation lever 61 abuts on the outer peripheral portion of the rear end of the operation sleeve 53 and the rotation is performed. This is because the valve shaft 43 is not stopped and moved to the valve opening position.

  When the operation lever 61 is operated in the state shown in FIG. 3, the seal ring 41 is pushed by the cam portion 62 and moves forward together with the valve shaft 43 that moves forward against the spring force of the operating spring 65. To do. At this time, the annular valve body 42 is pushed by the valve spring 45 and moves forward while following the seal ring 41. That is, even if the operation lever 61 is operated to a position where the rotation of the operation lever 61 stops, the seal ring 41 and the annular valve body 42 move forward without touching each other, so the on-off valve 40 is closed. The state can be maintained.

  As described above, in the pipe joint according to the present embodiment, the open / close valve 40 cannot be opened even if the operation lever 61 is operated to open the open / close valve 40 when the plug 2 is not connected. The fluid in the fluid passage 30 is not leaked to the outside, and high safety can be ensured.

  When connecting the plug 2 to the socket 1, first, the front end portion of the plug body 4 is inserted into the connection port 22 of the connection port body 20 of the socket body 3, and the front end portion is the front end surface of the annular valve body 42 as it is. Insert to the position where it touches. At this time, first, the front end portion of the plug body 4 passes through each ball support hole 50 from the connection port 22 of the connection port body 20 toward the rear side, and is inserted into the ball receiving annular body 23 at the ball receiving position. The

  Then, the front side surface of the protrusion 5 of the plug body 4 abuts on the inner surface of the ball receiving protrusion 23 a of the ball receiving annular body 23. When the plug body 4 is further inserted, the protrusion 5 moves the ball receiving annular body 23 backward against the spring force of the annular body spring 24. Then, as the plug body 4 is inserted, the protrusion 5 passes through the ball support hole 50, the engagement groove 2a reaches the position of the inner peripheral side opening of the ball support hole 50, and the front end surface of the plug body 4 has an annular shape. The valve body 42 comes into contact with the front end surface and stops.

  As a result, the annular valve body 42 is prevented from moving forward and stops at the position where the front end face of the plug main body 4 abuts. Further, the annular valve body 42 has the stepped surface 42 b abutting against the front end surface of the main body 10, and the backward movement is restricted by the compressed valve spring 45. Further, the ball receiving annular body 23 moves back to the ball standby position so that the ball receiving protrusion 23 a is detached from the ball support hole 50.

  At this time, the ball 51 supported in the ball support hole 50 is released from the inner peripheral side of the connection port body 20 and thus moves so as to protrude from the inner peripheral side opening. Accordingly, the operation sleeve 53 in the connection release position is pushed by the sleeve spring 54 and moves forward to the connection holding position.

  The ball 51 of the ball support hole 50 engages with the engagement groove 2 a of the plug body 4 and is fixed while being pressed from the outer peripheral side by the ball pressing surface 53 a of the operation sleeve 53. As a result, the plug body 4 is connected and fixed to the socket body 3. In this case, in the on-off valve 40, the annular valve body 42 is in a state in which forward movement is prevented because the front end surface thereof is in contact with the front end surface of the plug body 4.

  Further, the fluid passage 30 of the socket body 3 is closed because the annular valve body 42 and the seal ring 41 are in contact with each other. At this time, since the operation sleeve 53 of the connection operation means 21 is in the connection holding position, the operation lever 61 can be displaced from the upright position to the parallel position, and the on-off valve 40 can be opened.

  When the operation lever 61 is tilted from the vertical position, the valve shaft 43 and the valve shaft support body 44 move forward against the spring force of the operating spring 65 by the action of the cam portion 62 as described above, and together with the valve shaft 43 The seal ring 41 also moves forward. However, since the annular valve body 42 is pressed by the plug body 4, it does not move forward.

  For this reason, as the seal ring 41 moves forward together with the valve shaft 43, the seal ring 41 is separated from the annular valve body 42. Accordingly, a gap is generated between the two and the on-off valve 40 is opened. Since the pair of notch recesses 46 of the valve shaft 43 are disposed at positions facing the gap between the separated seal ring 41 and the annular valve body 42, the fluid passage 30 is opened.

  Thus, in the pipe joint according to the present embodiment, the on / off valve 40 can be opened by operating the operation lever 61 of the valve operating means 60 only in a state where the plug 2 and the socket 1 are connected. In other words, since the on-off valve 40 cannot be opened unless the plug 2 is connected to the socket 1, it is possible to reliably prevent the occurrence of an accident such as leakage of liquid in the fluid passage 30 to the outside when both are not connected. be able to.

  When the fluid passage 30 is opened, the fluid introduced into the socket body 3 through the fluid circulation hole 11 passes through the notch recess 46 between the spring receiving ring protrusion 15 and the valve shaft 43. It passes between the seal ring 41 and the annular valve body 42 sequentially. And it introduce | transduces into the apparatus for heating and cooling through the fluid channel | path 30 from the inlet connection part 4a of the plug main body 4. FIG.

  Further, when the on-off valve 40 is opened, the plug 2 cannot be removed from the socket 1 due to the action of the connection locking means described above, so that the plug 2 is detached from the socket 1 while the fluid is flowing through the fluid passage 30. Therefore, it is possible to reliably prevent an accident that the fluid leaks to the outside.

  Therefore, when the plug 2 is removed from the socket 1, the on-off valve 40 must be closed first. That is, for this purpose, the operation lever 61 is displaced from the parallel position to the upright position. As a result, the high portion surface 62b of the cam portion 62 that is in contact with the rear end surface of the valve shaft 43 and the valve shaft support body 44 is removed, so that the valve shaft support body 44 is pushed back by the operating spring 65. Then, the valve shaft 43 and the seal ring 41 are also moved backward to come into contact with the annular valve body 42. Thereby, the on-off valve 40 is closed.

  Then, the restriction of the backward movement by the operation lever 61 of the operation sleeve 53 in the socket body 3 is released, so that the operation sleeve 53 can be moved from the connection holding position to the connection release position. That is, the operation sleeve 53 is moved from the ball pressing position against the sleeve spring 54, so that the ball relief groove 53 b is located behind the center of the ball 51 and the ball 51 can move to the outer peripheral side of the connection port body 20. Move backward to position.

  As a result, the engagement state between the engagement groove 2a of the plug body 4 inserted into the connection port body 20 and the ball 51 becomes loose, and the ball receiving annular body 23 is pushed forward by the annular body spring 24 and moves forward. Then, the plug body 4 is retracted toward the front side. When the plug body 4 moves backward, the ball 51 engaged with the engagement groove 2a is pushed by the protrusion 5 and moves to the outer peripheral side, and the engagement state is released. Accordingly, the connection of the plug body 4 to the socket body 3 is released, and the plug body 4 is pushed by the ball receiving annular body 23 and pushed outward from the connection port 22 of the connection port body 20.

  Thereafter, the ball receiving annular body 23 further moves forward to reach the ball receiving position, and the ball 51 protruding to the outer peripheral side of the connection port body 20 is received from the inner peripheral side by the ball receiving protrusion 23a to maintain this state. When the backward movement of the operation sleeve 53 is stopped, the operation sleeve 53 is pushed forward by the sleeve spring 54, and the ball escape groove 53b comes into contact with the protruding portion of the ball 51 and stops at the ball escape position.

  As described above, the pipe joint according to the first embodiment realizes a structure that can easily and stably perform the opening / closing operation of the opening / closing valve 40 by operating the operation lever 61. Moreover, the pipe joint according to the first embodiment realizes a structure that can reliably prevent fluid leakage when the on-off valve 40 is closed.

[Second Embodiment]
FIG. 5: is a side view which shows a part in a mode at the time of the connection of the socket and plug in the pipe joint which concerns on the 2nd Embodiment of this invention. The pipe joint according to the second embodiment is different from the pipe joint according to the first embodiment in the configuration of the valve operating means in the socket body 3 of the socket 1.

  That is, as shown in FIG. 5, the valve operating means 60A of the present embodiment includes a disk-shaped operating dial 61A screwed to the rear end side of the main body 10 of the socket body 3, and the center of the operating dial 61A. And a contact portion 62 </ b> A that contacts the valve shaft support 44 that supports the valve shaft 43. The operation dial 61A and the contact portion 62A are substituted for the operation lever 61 and the cam portion 62 in the first embodiment.

  In the valve operating means 60A configured as described above, the operation dial 61A is rotated and moved so that the valve shaft 43 and the valve shaft support 44 are moved forward and backward by the contact portion 62A. Other configurations and operational effects are the same as those of the pipe joint of the first embodiment. The connection locking means is configured by forming the operation sleeve 63 to extend toward the operation dial 61A.

  In the state where the plug main body 4 is connected to the socket main body 3 by the connection lock means and the operation dial 61A is moved forward to open the on-off valve 40, the rear end surface of the operation sleeve 53 and the front end surface of the operation dial 61A are Since they are close to each other, the backward movement of the operation sleeve 53 to the connection release position is prevented. In this case, a slit 59 is formed in the operation sleeve 53 so that the operation sleeve 53 and the pipe connection portion 12 do not interfere with each other.

[Third Embodiment]
FIG. 6: is a side view which shows a part in a mode at the time of the connection of the socket and plug in the pipe joint which concerns on the 3rd Embodiment of this invention. The pipe joint according to the third embodiment is obtained by eliminating the connection lock means and changing the arrangement mode of the valve operating means 60 from the configuration of the pipe joint according to the first embodiment.

  That is, as shown in FIG. 6, in the socket body 3, the valve operating means 60 is arranged so that the operating lever 61 is coaxially arranged with the valve shaft 43 when the on-off valve 40 is in the open position. Has been. The operation lever 61 is detachably attached to any position indicated by an arrow in the figure, and a cam portion 62 is integrally formed.

  In the pipe joint configured as described above, the connection locking means is eliminated, but the on-off valve 40 has a structure that can be opened only when the plug body 4 and the socket body 3 are completely connected. Is not different. That is, the dimensions and the like of each part are set so that the seal ring 41 and the annular valve body 42 in the on-off valve 40 are not separated even when the operation lever 61 is displaced to the parallel position in the disconnected state of the plug 2. Therefore, the pipe joint according to the present embodiment can have the same effects as the pipe joint according to the first embodiment.

[Fourth Embodiment]
FIG. 7: is a side view which shows a part in a mode at the time of the connection of the socket and plug in the pipe joint which concerns on the 4th Embodiment of this invention. The pipe joint according to the fourth embodiment is different from the pipe joint according to the first embodiment in that a known swivel joint 80 is provided in the pipe connection portion 12.

  The swivel joint 80 is inserted into a receiving nut portion 82 attached to the pipe connection portion 12, and a nipple portion 83 attached to the tip of the hose 81 from the refrigerant supply / recovery source is rotatably inserted around the axis of the pipe connection portion 12. It is a thing. According to this configuration, the hose 81 can be freely rotated 360 degrees around the pipe connection portion 12 as compared with the case where the hose from the refrigerant supply / recovery source is directly attached to the pipe connection portion 12. The degree of freedom of installation can be increased, convenience can be improved, and restrictions on use can be reduced. Other functions and effects are the same as those of the pipe joint according to the first embodiment.

[Other Embodiments]
In the above-described embodiment, the one-touch system is used as the connection operation means 21, which can be connected by a single operation of inserting the plug body 4 into the socket body 3 using the ball receiving ring body 23. However, the present invention is not limited to this, and a so-called two-action method can also be adopted.

  In the two-action system, the plug body 4 is inserted into the socket body 3 with the operation sleeve 53 moved backward from the connection holding position to the connection release position without providing the ball receiving ring 23. Thereafter, the force applied to the operation sleeve 53 is removed, and the sleeve spring 54 requires two operations of moving the operation sleeve 53 forward to the connection holding position.

  In the above-described embodiment, the pipe joint is used to circulate fluid between the heating / cooling device and the refrigerant supply / recovery source. In addition, various fluids such as liquid and gas are circulated. It may be used to

DESCRIPTION OF SYMBOLS 1 Socket 2 Plug 3 Socket main body 4 Plug main body 10 Main body 20 Connection port body 21 Connection operation means 30 Fluid passage 40 On-off valve 41 Seal ring 42 Toroidal valve body 43 Valve shaft 44 Valve shaft support body 45 Valve spring 53 Operation sleeve 60 Valve Operation means 61 Operation lever 62 Cam part

Claims (6)

In a pipe joint having a socket and a plug that are joined together,
The socket is
A socket body having a cylindrical shape with one end opened to which the plug is inserted and fitted; and
An on-off valve mounted inside the socket body;
A valve operating means provided at the other end of the socket body for opening and closing the on-off valve;
Connection operation means for operating connection or disconnection of the socket and the plug;
The socket body is
A connection port provided at the one end and into which the plug is inserted;
A fluid passage formed along the axial direction of the socket body from the connection port;
Pipe connection means formed with fluid flow holes communicating with the fluid passage along the radial direction of the socket body;
The on-off valve is
A valve shaft in the form of a rod provided inside the fluid passage so as to advance and retreat between the valve open position and the valve close position along the axial direction;
A first valve body attached to a peripheral wall on the connection port side of the valve shaft and moving forward and backward along the axial direction together with the valve shaft;
The fluid passage is provided inside the fluid passage so as to be able to move forward and backward along the axial direction so as to be able to close or open the fluid passage by contacting or separating from the first valve body, and the plug is completely connected to the connection port. A second valve body that is in contact with the tip of the plug when inserted and is prevented from moving in a direction to contact the first valve body;
A first elastic member that applies a force in a direction in which the second valve body is in contact with the first valve body and in which the valve shaft is away from the valve operating means ;
It said valve operating means,
A valve operating member can be displaced so as to advance and retreat between the closed position and the open position along the front Kibenjiku in the axial direction,
A larger force than the first elastic member is applied to the valve shaft in a direction in contact with the valve operating member and in a direction in which the first valve body contacts the second valve body. A second elastic member,
The connection operation means includes
An engagement body which is provided on the peripheral wall of the connection port and is supported by the socket body in a state of being detachably engaged with the plug inserted into the connection port;
Provided on the outer peripheral side of the peripheral wall of the connection port, between a connection holding position that presses the engagement body in a state engaged with the plug, and a connection release position that releases the engagement body from the engagement state with the plug. And a connecting operation member having an annular shape that is displaced.   The valve operating member includes a rotating shaft provided in the socket body in a direction orthogonal to a central axis of the valve shaft, and a cam-shaped contact portion that is attached to the rotating shaft and contacts the rear end of the valve shaft. And an operation lever for rotating the contact portion around the rotation shaft, and the operation lever opens the valve shaft at the contact portion when the socket and the plug are coupled. The pipe joint according to claim 1, wherein when moved to a position, the distal end portion is disposed at a position that restricts movement of the connection operation member from the connection holding position to the connection release position.   The valve operation member is a disk-shaped operation dial that is screwed and arranged in the socket body in a state having a screw shaft along the axial direction and has a contact portion that contacts the valve shaft. The abutting portion rotationally displaces about the screwing shaft as the valve shaft moves between the valve opening position and the valve closing position, and the operation dial is connected to the socket and the plug. When the valve shaft is moved to the valve open position by the contact portion, the tip end portion is disposed at a position that restricts movement of the connection operation member from the connection holding position to the connection release position. The pipe joint according to claim 1.   When the plug is completely inserted into the connection port, the connection operation member is moved to the connection holding position, and the valve shaft is moved to the valve opening position. In addition, both end portions are close to each other at a distance shorter than the displacement amount from the connection holding position of the connection operation member to the connection release position, and the displacement of the connection operation member to the connection release position is prevented. The pipe joint according to any one of claims 1 to 3, comprising a connection locking means for locking a connection state of the plug. The engagement body is supported on the peripheral wall of the connection port so as to be movable in the radial direction in a support hole formed so as to narrow from the outer peripheral side toward the radially inner side, and is formed on the plug. A spherical body that is detachably engaged with the groove-like engagement portion,
The connection operation member holds the spherical body so as to protrude from the outer peripheral side toward the radially inner side at the connection holding position on the distal end side of the socket body, and the connection on the rear end side of the socket body. 5. The displacement according to claim 1, wherein the third elastic member is capable of being displaced in a state where the protrusion is eliminated so that the protrusion is eliminated, and a force in the direction toward the connection holding position is applied by a third elastic member. The pipe joint according to any one of claims.   The pipe joint according to any one of claims 1 to 5, wherein the pipe connection means includes a swivel joint connected to a fluid introduction side of the fluid circulation hole.

Images