JP2010071315A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lock a joint condition of a pipe joint surely with a simple configuration. <P>SOLUTION: In a pipe joint 10 including a socket 12 and plug 14 arranged by facing the socket 12, a pair of convex sections 40a and 40b are provided in the peripheral end section of a holder 16 provided in an end section of the socket 12, and a pair of concave sections 68a and 68b, possible to house the convex sections 40a and 40b, are provided in the inner circumference of a sleeve 20 provided in a peripheral side of the holder 16. Furthermore, in a connecting condition of the pipe joint 10 in which the socket 12 and the plug 14 are connected, the pipe joint 10 is locked in the connecting condition by regulating a movement of the sleeve 20 toward the socket 12 side in such a way that the concave sections 68a and 68b are arranged to cross the convex sections 40a and 40b at roughly right angles by rotating the sleeve 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pipe joint that opens and closes a flow path by connecting or separating a socket and a plug so that the socket and the plug can be locked in a coupled state.

  Conventionally, a pipe joint that automatically opens and closes a flow path when a socket and a plug are connected or separated has been adopted. In this pipe joint, the valve body is automatically opened and closed by connecting / disconnecting the plug to / from the socket, and the flow state of the air flowing through the flow path is switched by the valve body.

  Such a pipe joint is comprised from a plug and a socket, for example, and it is formed so that the insertion part formed in the edge part of this plug may be inserted in the inside of the said socket. The socket is provided so as to be movable in the rotational direction and the axial direction, a lock sleeve capable of switching a connection state between the socket and the plug, and a lock capable of holding the connection state by restricting the movement of the lock sleeve. And a mechanism.

  This locking mechanism is provided on the outer peripheral surface of the socket body constituting the socket, and is provided with an L-shaped locking groove covered with the lock sleeve, and is provided on the inner peripheral surface of the lock sleeve and is locked with the locking groove. And a locking projection. Then, from the state in which the locking projection is engaged with one end of the locking groove, the lock sleeve is rotated and displaced along the axial direction, and then the plug is inserted into the socket, whereby the ball is plugged. The lock sleeve is restored to its original position by the elastic force of the compression coil spring. Thus, the lock sleeve restricts the displacement of the ball toward the outer periphery, and the plug is held in a state of being connected to the socket.

JP 2000-193172 A

  However, in the prior art according to Patent Document 1, it is necessary to form the locking groove constituting the lock mechanism by processing the lock sleeve, which increases the manufacturing cost and increases the number of parts and assembly steps. Will increase.

  In addition, when locking with the socket and plug connected by the locking mechanism, it is difficult to confirm the locked state, and the locking projection is moved along the locking groove due to vibration, malfunction, etc. There is a concern that will be canceled accidentally.

  The present invention has been made in consideration of the above-described problems, and provides a pipe joint capable of reliably locking the first joint member and the second joint member in a coupled state with a simple configuration. Objective.

To achieve the above object, the present invention provides a first joint member, a holder that is integrally connected to the first joint member, and a second joint that is detachably attached to the inside of the holder. In a pipe joint having a member and a sleeve capable of switching the coupling state of the first joint member and the second connection member,
The sleeve is provided on the outer peripheral side of the holder and the first joint member so as to be displaceable along the axial direction, and is provided so as to be rotatable along the circumferential direction, and is an end of the first joint member facing the sleeve. The portion is provided with a lock mechanism for restricting displacement along the axial direction of the sleeve in a coupled state of the first joint member and the second joint member, and the lock mechanism is provided on the first joint member. The convex portion protrudes outward in the radial direction, and the sleeve is locked by the convex portion when the sleeve is displaced toward the first joint member.

  According to the present invention, in the pipe joint in which the first joint member and the second joint member are mounted so as to be connected or detached via the holder, the sleeve is disposed on the outer peripheral side of the holder and the first joint member. The first joint member and the second joint member are coupled to each other at the end of the first joint member. A lock mechanism for restricting displacement along the axial direction of the sleeve is provided. When the sleeve is about to be displaced to the first joint member side by mistake, the sleeve is locked by the convex portion constituting the lock mechanism, so that the first joint member and the second joint member are displaced by the displacement of the sleeve. It is prevented that the combined state with is released.

  Therefore, it is possible to reliably lock the first joint member and the second joint member in a coupled state with a simple configuration in which the protrusion of the lock mechanism is provided at the end of the first joint member. As a result, when the first joint member and the second connecting member are in the coupled state, the sleeve is reliably prevented from being displaced in the axial direction, and the coupled state is reliably maintained.

  Furthermore, it is preferable that the inner peripheral surface of the sleeve has a concave portion capable of accommodating the convex portion, and the convex portion is accommodated in the concave portion when the sleeve is displaced toward the first joint member. Thereby, since the sleeve in which the displacement to the first joint member side locked by the convex portion is regulated can be made displaceable by being accommodated in the concave portion provided in the sleeve, The coupled state between the first joint member and the second joint member can be released.

  Furthermore, since the concave portion can be arranged in line with the convex portion by rotating the sleeve with respect to the first joint member and the holder, when the sleeve is displaced toward the first joint member side, A convex portion can be accommodated in the concave portion, the sleeve is displaced to the first joint member side without being locked, and the coupling state of the first joint member and the second joint member is released. can do.

  Still further, when the sleeve includes a rotation restricting means for restricting the rotational displacement of the sleeve, the sleeve is rotated when the first joint member and the second connecting member are held by the lock mechanism. Is prevented from being accidentally released.

  The rotation restricting means includes an engaging portion that is provided on the inner peripheral surface of the sleeve and is engaged with the groove portion of the holder, and the engaging portion biases the sleeve toward the second joint member. It is good to hold | maintain in the said groove part by the pressing force of. As a result, the engaging portion provided on the sleeve can be engaged with the groove portion of the holder by using the pressing force of the spring, so that the sleeve is erroneously rotated by vibration or external force. That is definitely prevented.

  Furthermore, a plurality of engaging portions and groove portions may be provided at equal intervals along the circumferential direction of the sleeve and the holder.

  Furthermore, the first joint member and the second joint member are connected to each other by providing a display portion on the outer peripheral surface of the sleeve, which indicates a locked state in which displacement along the axial direction of the sleeve is restricted by the lock mechanism. It is possible to easily and surely confirm that it is locked.

  According to the present invention, the following effects can be obtained.

  That is, a holder that constitutes the pipe joint and a sleeve provided on the outer peripheral side of the first joint member are provided so as to be displaceable in the axial direction and the rotational direction, and the end of the first joint member is provided with the first joint. In a coupled state of the member and the second joint member, by providing a lock mechanism including a convex portion that restricts displacement along the axial direction of the sleeve, the sleeve erroneously moves toward the first joint member side. In this case, since the sleeve is locked by the convex portion constituting the lock mechanism, the coupling state of the first joint member and the second joint member is reliably maintained with a simple configuration in which the convex portion is provided. .

  Preferred embodiments of the pipe joint according to the present invention will be described below and described in detail with reference to the accompanying drawings.

  In FIG. 1, reference numeral 10 indicates a pipe joint according to an embodiment of the present invention. Here, the state where the plug 14 is connected to the socket 12 will be described with reference to FIGS.

  This pipe joint 10 is made of a metal material, and is provided with a socket (first joint member) 12 disposed on one side (in the direction of arrow A) along the axial direction, and the other side facing the socket 12 ( A plug (second joint member) 14 disposed coaxially in the direction of arrow B), a holder 16 provided at an end of the socket 12 into which a part of the plug 14 is inserted, A sleeve 20 is mounted so as to surround the outer peripheral surface of the holder 16 and is movable in the axial direction under the elastic action of a sleeve spring 18, and is provided inside the socket 12. A valve mechanism 22 that switches the communication state between the socket 12 and the plug 14.

  The socket 12 is formed on one end side (in the direction of the arrow A), and is connected to a first connection portion 26 to which a pipe or the like (not shown) is connected, and a hexagonal column-shaped first provided adjacent to the first connection portion 26. It has a fastening portion 28 and a holding portion 30 that is formed on the other end side (arrow B direction) and can hold the holder 16.

  Further, the socket 12 has a port 32 formed in the first connection portion 26, and a space portion 34 that is radially expanded with respect to the port 32 in the first fastening portion 28. It is done. The space portion 34 is provided with a valve mechanism 22 to be described later.

  Further, a stepped portion 36 having a larger diameter than the space portion 34 is formed on the inner peripheral surface of the holding portion 30 constituting the socket 12, and an annular packing 38 is attached to the stepped portion 36. .

  The holding part 30 is formed in a cylindrical shape, and a pair of convex parts 40a and 40b (see FIGS. 3 and 5) bulging outward in the radial direction are provided on the outer peripheral end part. The convex portions 40 a and 40 b are formed in a substantially rectangular cross section, and are provided on a straight line at positions facing each other across the center of the holding portion 30. That is, the end portion of the holding portion 30 is formed so that the two portions provided with the convex portions 40a and 40b protrude from the outer peripheral surface by a predetermined height.

  Further, two auxiliary lines 42 extend from the both ends along the width direction of the convex portions 40 a and 40 b toward the axial direction (direction of arrow A) of the holding portion 30 on the outer peripheral surface of the holding portion 30. Yes.

  On the other hand, a caulking portion 44 is formed on the inner peripheral surface of the holding portion 30 and is caulked from the outer peripheral side of the holding portion 30 and protrudes radially inward. The caulking portion 44 is formed at a substantially central portion along the axial direction of the holding portion 30, and is inserted into the groove 46 of the holder 16 when the holder 16 is inserted into the socket 12.

  The plug 14 is formed in a cylindrical shape from a metal material, and a part of the plug 14 is connected to the other end of the socket 12 by being inserted into the holder 16 and the socket 12. This plug 14 is formed on one end side (arrow A direction) and is formed on the other end side (arrow B direction) with an insert portion 48 that is gradually reduced in diameter toward the tip, and a pipe or the like (not shown) is connected to the plug 14. The second connecting part 50, the hexagonal column-like second fastening part 52 provided adjacent to the second connecting part 50, and the second fastening part 52 and the insert part 48. The outer circumferential surface is formed of a ball groove 54 that is recessed in an annular shape.

  For example, the holder 16 is formed in a cylindrical shape by forging from a metal material, and one end portion of the holder 16 on the socket 12 side (arrow A direction) has an outer peripheral surface facing the stepped portion 36 of the socket 12. It is arranged as follows. One end of the holder 16 is provided with an O-ring 56 on its inner peripheral surface and a ring member 58 that is in sliding contact with the O-ring 56. That is, the ring member 58 is disposed between the O-ring 56 and the packing 38 provided in the socket 12, and receives the load applied when the valve 80 is seated on the packing 38. Displacement to the holder 16 side (arrow B direction) is prevented. When the plug 14 is inserted into the socket 12, the O-ring 56 contacts the outer peripheral surface of the plug 14 (see FIG. 3). This prevents air from leaking outside through the holder 16 and the plug 14.

  Further, an annular concave groove 46 is provided on the one end portion side of the holder 16 along the outer peripheral surface thereof, and a caulking portion 44 provided in the holding portion 30 of the socket 12 is inserted. As a result, the holder 16 is positioned in the axial direction (arrow A, B direction) with respect to the socket 12 and is in a connected state in which movement along the axial direction is restricted.

  Note that one end portion of the holder 16 abuts against the end portion of the packing 38 when the holder 16 is inserted into the socket 12, and air leakage between the holder 16 and the socket 12 is prevented.

  The other end portion on the plug 14 side is provided with a flange portion 60 that is expanded in a radially outward direction, and a plurality of ball holes 62 that are spaced apart by a predetermined distance along the circumferential direction are provided in the vicinity of the flange portion 60. . A plurality of balls 64 are inserted into the ball holes 62 so as to be displaceable along the radial direction of the holder 16. The diameter of the ball hole 62 is formed slightly smaller on the inner peripheral side of the holder 16. Therefore, the ball 64 is held inside the ball hole 62 without falling off from the ball hole 62 into the holder 16.

  In addition, a plurality of (for example, four) positioning grooves 66 are formed on the side surface of the flange portion 60 so as to face one end portion side (in the direction of arrow A) of the holder 16. The positioning grooves 66 are formed to be recessed in a semicircular cross section with respect to the side surface, and are provided at regular intervals (for example, 90 °) apart from each other along the circumferential direction of the holder 16.

  On the other hand, the inner peripheral surface of the holder 16 is formed so as to gradually reduce the diameter from the other end side (arrow B direction) toward the one end side (arrow A direction). Specifically, the inner peripheral diameter of the holder 16 is set to be substantially constant from the other end portion to the substantially central portion along the axial direction, and is set so that the diameter gradually decreases from the substantially central portion toward the one end portion side. Has been. That is, the inner peripheral surface of the holder 16 is formed in a shape corresponding to the insert portion 48 of the plug 14 inserted therein.

  The sleeve 20 is formed in a cylindrical shape from a metal material, and is disposed so as to cover the outer peripheral surface of the holder 16. At one end of the sleeve 20, a pair of recesses 68 a and 68 b that are further expanded radially outward with respect to the inner peripheral surface of the sleeve 20 are formed. The recesses 68a and 68b are formed in a substantially rectangular shape in cross section, are provided in a straight line at positions facing each other across the center of the sleeve 20, and toward the other end side (in the direction of arrow B) of the sleeve 20. It is formed with a predetermined length. And when the sleeve 20 is arrange | positioned at the outer peripheral side of the holder 16, the convex parts 40a and 40b of this holder 16 are provided so that accommodation in the said recessed parts 68a and 68b is possible.

  That is, the recesses 68a and 68b are formed to have substantially the same cross-sectional shape while the inner peripheral diameter thereof is substantially the same as or slightly smaller than the outer peripheral diameter of the protrusions 40a and 40b. The lengths of the recesses 68a and 68b along the axial direction of the sleeve 20 are set to be approximately equal to the lengths along the axial direction of the projections 40a and 40b.

  On the other hand, in the vicinity of the other end portion of the sleeve 20 on the plug 14 side (in the direction of arrow B), a ball pressing portion 70 protruding radially inward is formed on the inner peripheral surface thereof, and the end portion of the ball pressing portion 70 is A sleeve spring 18 is interposed between the other end of the socket 12 and biases the sleeve 20 in a direction (arrow A direction) away from the socket 12. The ball pressing portion 70 is formed in an annular shape so as to face the ball hole 62 of the holder 16 and the ball 64 mounted in the ball hole 62, and is provided so as to be in contact with the outer peripheral surface of the ball 64.

  The sleeve 20 is provided with a plurality of (for example, four) bulges 72 that bulge radially inward from the inner peripheral surface thereof. The bulging portions 72 are formed in a semicircular cross section, are arranged at equal intervals along the circumferential direction of the sleeve 20, and are arcuate toward the other end side (arrow B direction). Formed to be.

  When the sleeve 20 is disposed on the outer peripheral side of the holder 16 and the sleeve 20 moves to one end side (in the direction of arrow A) of the holder 16 due to the elastic force of the sleeve spring 18, 72 is inserted into the positioning groove 66 of the holder 16.

  That is, the same number and the same cross-sectional shape are formed corresponding to the positioning grooves 66 provided in the holder 16 and are arranged at the same interval (for example, 90 °) along the circumferential direction. As described above, the bulging portion 72 of the sleeve 20 is inserted into the positioning groove 66 provided in the holder 16, thereby functioning as a detent mechanism capable of restricting the rotational displacement of the sleeve 20 relative to the holder 16.

  In other words, when the bulging portion 72 of the sleeve 20 is inserted into the positioning groove 66 provided at equal intervals, the rotation angle when the sleeve 20 is rotated is set to the positioning groove 66 and the bulging portion. 72 may be provided every 90 °.

  The detent mechanism is configured to be able to release the state in which the rotational displacement of the sleeve 20 is restricted by moving the sleeve 20 toward the socket 12 against the elastic force of the sleeve spring 18.

  On the outer peripheral surface of the sleeve 20, an annular gripping portion 74 bulging by a predetermined height from the outer peripheral surface and extending along the circumferential direction is formed. The gripping portion 74 is formed such that one end portion side of the sleeve 20 is aligned along the circumferential direction, and the other end portion side of the sleeve 20 is formed in an uneven shape along the axial direction of the sleeve 20. Specifically, at the other end of the gripping portion 74, a portion that is depressed by a predetermined length toward one end of the sleeve 20 and a portion that protrudes toward the other end of the sleeve 20 are alternately and continuously. In particular, it is formed along the circumferential direction of the sleeve 20.

  Further, on one end portion side of the gripping portion 74, a pair of instruction portions 76 that bulge from the outer peripheral surface of the sleeve 20 and protrude toward the one end portion side (direction of arrow A) of the sleeve 20 are provided. The instruction portion 76 is formed in a substantially rectangular shape in cross section, is provided at a position that is in a straight line across the center of the sleeve 20, and the socket 12 is provided on the outer peripheral surface of the grip portion 74 that is in a straight line with the instruction portion 76. And a plug 78 are provided to indicate that the plug 14 is locked in the connected state. For example, “LOCK” indicating the locked state is displayed on the display unit 78.

  The valve mechanism 22 is provided in the space portion 34 of the socket 12, and is capable of being displaced along the axial direction (arrow A, B direction) of the socket 12, and between the valve 80 and the inner wall surface of the space portion 34. And a valve spring 82 that is interposed therebetween and biases the valve 80 toward the plug 14 (in the direction of arrow B).

  The valve 80 is formed of, for example, a metal material, and has a main body portion 84, a plurality of leg portions 86 protruding at a predetermined height with respect to an end surface of the main body portion 84, and a radially outward direction with respect to the main body portion 84 And a seating portion 88 projecting from the front. The main body 84 is formed in a planar shape with one end face facing the plug 14 and the packing 38 extending in a direction orthogonal to the axis, and a columnar base 90 is provided at the center.

  For example, three leg portions 86 are provided, are spaced apart from each other at equal intervals around the base portion 90 and extend radially outward, and gradually increase in height from the base portion 90 side. It is formed. The leg portion 86 is disposed so that a portion on the outer peripheral side of the main body portion 84 has substantially the same diameter as one end portion of the plug 14, and when the plug 14 is attached to the socket 12 and the holder 16, The one end is provided so as to be capable of abutting against the tip of the portion 86.

  The seating portion 88 is formed in a bowl shape protruding with a predetermined diameter with respect to the outer peripheral surface of the main body portion 84, and one end surface on the plug 14 side (arrow B direction) is gradually tapered toward the leg portion 86 side. It is formed in a tapered shape. When the plug 14 is not connected to the socket 12, the seating portion 88 is in a valve-closed state in which the seating portion 88 abuts against the seating surface of the packing 38. Further, the other end surface of the seating portion 88 is formed in a flat shape, and one end portion of the valve spring 82 is fixed.

  On the other hand, the other end surface of the main body 84 facing the port 32 of the socket 12 is formed in a rectangular cross section, and a valve spring 82 is inserted through the outer peripheral side thereof. The valve spring 82 is formed of, for example, a coil spring that is wound twice in the radial direction and has an outer winding portion 92 and an inner winding portion 94, and one end portion of the outer winding portion 92 is a seating portion 88 of the valve 80. The other end portion of the outer winding portion 92 is attached to the inner wall surface at the joint portion between the space portion 34 and the port 32 constituting the socket 12. The outer winding portion 92 is formed in a substantially tapered shape with a gradually increasing diameter from one end portion on the valve 80 side toward the other end portion.

  On the other hand, the inner winding portion 94 of the valve spring 82 is shorter than the outer winding portion 92 in the axial direction, and one end portion on the valve 80 side is in contact with the main body portion 84. That is, the inner winding portion 94 functions as a stopper that regulates the amount of displacement of the valve 80 in a valve open state in which the valve 80 is separated from the packing 38.

  The pipe joint 10 according to the embodiment of the present invention is basically configured as described above. Next, a case where the socket 12 and the plug 14 in the pipe joint 10 are connected will be described.

  First, in a non-connected state of the pipe joint 10 in which the socket 12 and the plug 14 are separated, the display portion 78 displayed on the sleeve 20 is a convex provided on the outer peripheral surface of the socket 12 as shown in FIG. It is confirmed that the portions 40a and 40b and the auxiliary line 42 are not aligned with each other (unlocked state). Further, as shown in FIG. 4, when the display portion 78 is coincident with the convex portions 40a, 40b and the auxiliary line 42, the sleeve 20 is gripped and temporarily moved to the socket 12 side (arrow A direction). After sliding, the bulging portion 72 engaged with the positioning groove 66 is detached from the positioning groove 66 and then rotated by about 90 °. As a result, as shown in FIG. 9, the recesses 68a and 68b formed on the inner peripheral surface of the sleeve 20 and the protrusions 40a and 40b formed on the outer peripheral surface of the socket 12 are separated from each other by a predetermined distance on a straight line. It will be in the state arranged in. In this case, the bulging portion 72 of the sleeve 20 is engaged with the positioning groove 66 different from the above, and the rotational displacement of the sleeve 20 is regulated.

  In the socket 12 of the pipe joint 10 in which the plug 14 is not connected, the valve 80 is directed toward the holder 16 (in the direction of arrow A) under the elastic action of the valve spring 82, as shown in FIGS. The seat 88 is in contact with the packing 38. Further, the sleeve 20 is urged in the direction away from the socket 12 (in the direction of arrow B) under the elastic action of the sleeve spring 18, and the ball presser portion 70 of the sleeve 20 has an outer periphery of the ball 64 attached to the holder 16. It is in contact with the surface (see FIG. 10). Thereby, the plurality of balls 64 are pressed toward the inner peripheral side of the holder 16, and a part of the balls 64 is exposed inside the holder 16.

  Next, when the plug 14 is connected to the socket 12, the plug 14 is attached from the other end portion side (arrow B direction) of the holder 16 attached to the other end portion of the socket 12. In this case, first, as shown in FIGS. 12 and 13, an operator (not shown) moves the sleeve 20 toward the socket 12 (in the direction of arrow A) against the resilient force of the sleeve spring 18. After sliding, the plug 14 is inserted into the holder 16 from the insert portion 48 side. In this case, as shown in FIGS. 9 and 13, the sleeve 20 has the recesses 68a and 68b arranged in a straight line with the projections 40a and 40b of the socket 12, so that the sleeve 20 is moved to the socket 12 side. The protrusions 40a and 40b are accommodated inside the recesses 68a and 68b, and the movement of the sleeve 20 toward the socket 12 (in the direction of arrow A) is not restricted.

  Further, when the plug 14 is further pushed toward the socket 12 (in the direction of arrow A), the packing 38 is slidably contacted with the outer peripheral surface of the insert portion 48 and the O-ring 56 is slidably contacted. Airtightness between them is maintained. Thereafter, the end portion of the insert portion 48 comes into contact with the leg portion 86 of the valve 80 and presses the valve 80 toward the port 32 side (in the direction of arrow A) of the socket 12 via the leg portion 86.

  As a result, the valve 80 is displaced against the elastic force of the valve spring 82, and the seating portion 88 constituting the valve 80 is separated from the packing 38 and the through hole 96 of the space 12 of the socket 12 and the plug 14. And communicate. As a result, the air supplied to the port 32 of the socket 12 circulates between the space portion 34 and the leg portion 86 of the valve 80 to the through hole 96 of the plug 14, and to the piping connected to the plug 14. And circulate.

  Next, in a state where the socket 12 and the plug 14 are connected, the sleeve 20 is gripped and once slid toward the socket 12 (in the direction of arrow A), and then the socket 12 and the plug 14 are predetermined. As shown in FIG. 1, the display portion 78 described in the gripping portion 74 of the sleeve 20 is aligned with the auxiliary line 42 and the convex portions 40 a and 40 b of the socket 12 by rotating by an angle (about 90 °). Arrange so that Accordingly, the convex portions 40a and 40b of the socket 12 shown in FIG. 7 and the concave portions 68a and 68b of the sleeve 20 are positioned substantially orthogonal to each other. When the sleeve 20 is moved to the socket 12 side, the concave portions 68a. 68b cannot accommodate the convex portions 40a, 40b. In other words, the end portion of the inner peripheral surface of the sleeve 20 comes into contact with the convex portions 40a and 40b, and the movement toward the socket 12 is restricted.

  Therefore, since the sleeve 20 does not move to the socket 12 side, the ball 64 is held by the sleeve 20 while being pressed toward the inner peripheral side, and the plug 14 is detached from the socket 12 and the holder 16. There is no. That is, the pipe joint 10 is in a locked state in which the socket 12 and the plug 14 are held in a connected state. Moreover, since the display part 78 provided in the sleeve 20 corresponds with the convex parts 40a and 40b and the auxiliary line 42 of the socket 12, the pipe joint 10 including the socket 12 and the plug 14 is locked in the connected state. It can be easily confirmed (see FIG. 1).

  Further, also in this case, the bulging portion 72 of the sleeve 20 is engaged with each of the adjacent positioning grooves 66 different from the above, and the rotational displacement of the sleeve 20 is restricted. And accidental rotation due to external force.

  That is, the recesses 68a and 68b provided on the inner peripheral surface of the sleeve 20 are locking mechanisms capable of restricting the sleeve 20 from moving toward the socket 12 when the socket 12 and the plug 14 are connected. This prevents the socket 12 and the plug 14 connected to each other from being accidentally detached.

  On the other hand, when removing the plug 14 from the pipe joint 10 to which the socket 12 and the plug 14 are connected in this way, first, an operator (not shown) grips the sleeve 20 and resists the elastic force of the sleeve spring 18. Then, the display unit 78 is aligned with the auxiliary line 42 and the convex portions 40a and 40b of the socket 12 (see FIG. 1) after being slid to the socket 12 side (arrow A direction) (for example, 90 °). That is, the display unit 78 is set at a position shifted in the circumferential direction with respect to the auxiliary line 42. As a result, the concave portions 68a and 68b of the sleeve 20 and the convex portions 40a and 40b of the socket 12 are again arranged in a straight line, and the sleeve 20 can be moved to the socket 12 side (arrow A direction). Become.

  When the operator releases the gripping state of the sleeve 20, the sleeve 20 is moved toward the plug 14 (in the direction of arrow B) by the elastic force of the sleeve spring 18, and the bulging portion 72 is formed in the positioning groove. 66, the sleeve 20 is prevented from being rotationally displaced with respect to the holder 16 and the socket 12.

  Then, the sleeve 20 is slid again toward the socket 12 (in the direction of arrow A) against the elastic force of the sleeve spring 18, and then the plug 14 is pulled in a direction in which the plug 14 is separated from the socket 12 (in the direction of arrow B). As a result, the ball pressing portion 70 of the sleeve 20 arranged so as to cover the ball groove 54 moves, and the ball 64 inserted into the ball groove 54 of the plug 14 moves radially outward along the ball hole 62. Extruded. As a result, the movement restriction state along the axial direction of the plug 14 by the ball 64 is released, and the pressing force against the valve 80 is extinguished. Therefore, the valve 80 is plugged by the elastic force of the valve spring 82. It is pressed in the direction of arrow A.

  When the plug 14 is further moved away from the socket 12 (arrow B direction), the seating portion 88 of the valve 80 abuts against the packing 38, and the communication between the space portion 34 of the socket 12 and the inside of the holder 16 is established. Is cut off. Thereby, when the plug 14 is detached from the socket 12, the air supplied to the space 34 of the socket 12 is held without leaking outside.

  Thus, the pipe joint 10 with the plug 14 detached from the socket 12 can be brought into a non-connected state.

  As described above, in the present embodiment, the sleeve 20 is rotatably provided on the outer peripheral side of the socket 12 constituting the pipe joint 10, and the pair of convex portions 40 a and 40 b are provided on the outer peripheral surface of the socket 12. A pair of recesses 68 a and 68 b that can accommodate the protrusions 40 a and 40 b are provided on the inner peripheral surface of the sleeve 20. When the socket 12 and the plug 14 are connected, or when the connected socket 12 and the plug 14 are detached, the recesses 68a and 68b are aligned with the protrusions 40a and 40b of the socket 12. By rotating the sleeve 20 as described above, the sleeve 20 can be moved by a predetermined distance toward the socket 12 (in the direction of arrow A). As a result, it is possible to move the sleeve 20 by accommodating the convex portions 40a and 40b in the concave portions 68a and 68b, and the plug 14 is held by the plurality of balls 64 held by the movement of the sleeve 20. Is released.

  On the other hand, in a state where the socket 12 and the plug 14 are connected, the sleeve 20 is rotated so that the concave portions 68a and 68b and the convex portions 40a and 40b of the socket 12 are arranged so as to be substantially orthogonal to each other. When trying to move to the socket 12 side (in the direction of arrow A) by mistake, the convex portions 40a and 40b are not inserted into the concave portions 68a and 68b, and the convex portions 40a and 40b and the inner peripheral surface of the sleeve 20 The end portion comes into contact with and is locked. As a result, in the connected state of the pipe joint 10, the sleeve 20 is erroneously moved to the socket 12 side, and the plug 14 is not detached from the socket 12 and can be reliably maintained in the connected state.

  Further, a plurality of bulging portions 72 bulging from the inner peripheral surface are provided at one end portion of the sleeve 20, and the bulging portion 72 can be inserted into the flange portion 60 of the holder 16 facing the one end portion of the sleeve 20. The positioning groove 66 is provided. Since the sleeve 20 is always urged toward the flange portion 60 side (in the direction of arrow B) of the holder 16 by the sleeve spring 18, the sleeve 20 is inserted with the bulging portion 72 inserted into the positioning groove 66. It is held by the elastic force of the spring 18. This prevents the sleeve 20 from being erroneously rotationally displaced by, for example, vibration or external force in the locked state in which the movement of the sleeve 20 toward the socket 12 (arrow A direction) is restricted. The As a result, in the connected state of the pipe joint 10 in which the socket 12 and the plug 14 are connected, the sleeve 20 is prevented from being accidentally rotated and displaced to be released.

  Further, the gripping portion 74 provided on the outer peripheral surface of the sleeve 20 has the concave portions 68a and 68b of the sleeve 20 and the convex portions 40a and 40b of the socket 12 arranged at positions substantially orthogonal to each other. A display portion 78 is provided on the outer peripheral surface of the socket 12 facing the 40a and 40b. Therefore, the sleeve 20 is rotated with respect to the socket 12 and the holder 16, and the display portion 78 is aligned with the convex portions 40a and 40b and the auxiliary line 42 extending from the convex portions 40a and 40b. The socket 12 and the plug 14 can be easily locked in a connected state.

  That is, by providing the display portion 78 and the auxiliary line 42 as described above, it is possible to visually confirm the locked state of the pipe joint 10 to which the socket 12 and the plug 14 are connected. On the other hand, when the display unit 78 is not positioned on the straight line of the convex portions 40 a and 40 b and the auxiliary line 42, the sleeve 20 can be moved to the socket 12 side, and the plug 14 is connected to the socket 12. Can be confirmed to be in a state (unlocked state) in which connection or disconnection is possible.

  Furthermore, a plurality of bulging portions 72 are provided at the end portion of the sleeve 20, and when the sleeve 20 is rotated, the elastic force of the sleeve spring 18 moves the flange portion 60 side (arrow B direction) of the holder 16. It is pressed and inserted into the positioning groove 66 of the flange portion 60. Since the bulging portion 72 and the positioning groove 66 are provided so as to be spaced apart at equal intervals along the circumferential direction of the sleeve 20 and the holder 16, the sleeve 20 can be rotated at equal angles. Become. As a result, for example, a locked state in which the movement of the sleeve 20 to the socket 12 side (in the direction of arrow A) is regulated by rotating the sleeve every 90 °, and an unlocked state in which the sleeve 20 can move to the socket 12 side. Can be switched reliably.

  Furthermore, the sleeve 20 and the holder 16 are formed by, for example, forging from a metal material, so that the manufacturing cost can be reduced as compared with a conventional pipe joint in which a lock sleeve or the like is manufactured by cutting. Can do.

  In addition, since the lock mechanism 24 that restricts the movement of the sleeve 20 in the connected state in which the socket 12 and the plug 14 are connected to each other can be configured by the pair of convex portions 40a and 40b provided in the socket 12, it is conventional. Compared with this pipe joint, it can be configured simply without increasing the number of parts.

  Of course, the pipe joint according to the present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.

It is an external appearance perspective view of the pipe joint which concerns on this Embodiment. It is sectional drawing along the II-II line of FIG. It is sectional drawing along the III-III line of FIG. It is an external appearance perspective view which shows the socket, sleeve, and holder which comprise the pipe joint shown in FIG. It is a disassembled perspective view of the socket of FIG. 4, a sleeve, and a holder. FIG. 6 is an exploded perspective view of a socket, a sleeve, and a holder as seen from a direction different from FIG. 5. It is sectional drawing along the VII-VII line of FIG. FIG. 5 is an external perspective view showing a state where the sleeve of FIG. 4 is rotated by a predetermined angle with respect to the socket. It is sectional drawing along the IX-IX line of FIG. FIG. 9 is a partially omitted cross-sectional view of a pipe joint showing a state before a plug is attached to the pipe joint of FIG. 8. FIG. 11 is a partially omitted cross-sectional view of a pipe joint viewed from another cross-section orthogonal to FIG. 10. FIG. 11 is a partially omitted cross-sectional view of a pipe joint showing a state where an insert portion of a plug is inserted into the socket of FIG. 10. FIG. 13 is a partially omitted cross-sectional view of the pipe joint viewed from another cross-section orthogonal to FIG. 12.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Pipe joint 12 ... Socket 14 ... Plug 16 ... Holder 20 ... Sleeve 22 ... Valve mechanism 24 ... Locking mechanism 30 ... Holding part 38 ... Packing 40a, 40b ... Convex part 42 ... Auxiliary wire 58 ... Ring member 60 ... Flange part 64 ... Ball 66 ... Positioning groove 68a, 68b ... Recess 72 ... Swelling part 74 ... Gripping part 76 ... Instruction part 78 ... Display part 80 ... Valve 82 ... Valve spring

Claims (7)

A first joint member; a holder that is integrally coupled to the first joint member; a second joint member that is detachably attached to the inside of the holder; and the first joint member and the second connection member In a pipe joint having a sleeve that can switch the coupling state with
The sleeve is provided on the outer peripheral side of the holder and the first joint member so as to be displaceable along the axial direction, and is provided so as to be rotatable along the circumferential direction, and is an end of the first joint member facing the sleeve. The portion includes a lock mechanism for restricting displacement along the axial direction of the sleeve in a coupled state of the first joint member and the second joint member, and the lock mechanism is provided on the first joint member. A pipe joint comprising a convex portion protruding radially outward, and the sleeve is locked by the convex portion when the sleeve is displaced toward the first joint member. In the pipe joint according to claim 1,
The inner peripheral surface of the sleeve has a concave portion that can accommodate the convex portion, and the convex portion is accommodated in the concave portion when the sleeve is displaced toward the first joint member. And pipe fittings. In the pipe joint according to claim 1 or 2,
The said recessed part is arrange | positioned in a line with the said convex part by rotating the said sleeve with respect to the said 1st joint member and a holder, The pipe joint characterized by the above-mentioned. In the pipe joint according to any one of claims 1 to 3,
The sleeve is provided with a rotation restricting means for restricting the rotational displacement of the sleeve. In the pipe joint according to claim 4,
The rotation restricting means is provided on an inner peripheral surface of the sleeve and includes an engaging portion engaged with a groove portion of the holder. The engaging portion attaches the sleeve toward the second joint member side. A pipe joint that is held in the groove by a pressing force of a spring to be energized. In the pipe joint according to claim 5,
A plurality of the engaging portions and the groove portions are provided at equal intervals along the circumferential direction of the sleeve and the holder. In the pipe joint according to any one of claims 1 to 6,
The pipe joint according to claim 1, wherein a display portion is provided on an outer peripheral surface of the sleeve to indicate a locked state in which displacement along the axial direction of the sleeve is restricted by the locking mechanism.

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