JP5424483B2 - Rapid fitting - Google Patents

Description

  The present invention provides a quick connection that allows one-touch connection to a connection target pipe on the other side when connecting a refrigerant gas charging device to a cold air conditioner, piping for water absorption / hot water supply, gas piping, pipe-like product leakage inspection, etc. It relates to pipe joints.

  Conventionally, a quick pipe joint used when connecting a fluid path such as a pressure gas or a pressure liquid to various pipes to be connected has a mechanism that can be quickly attached and detached by a simple operation.

  Here, when the quick joint is connected to the pipe to be connected, no consideration is given to fluid leakage and to ensure that the connected state is reliably maintained.

  As this type of quick pipe joint, a quick pipe joint C having a configuration shown in FIG. 6 is conventionally used (see, for example, Patent Document 1).

  The quick pipe joint C includes a joint body 70 and a locking piece 71, and is connected to the mating connection target pipe T by engaging the inner surface 71a of the locking piece 71. The joint body 70 has a cylindrical shape, and a locking piece 71 is inserted into the front end portion thereof, and an adapter 73 is screwed onto the outer periphery of the rear end portion.

  The locking piece 71 displaced to the engagement position is locked at the engagement position by the lock mechanism 80.

  A ball support hole 70a penetrating in the radial direction is formed in the joint body 70, and a lock ball 80a is accommodated in the ball support hole 70a so as to be movable in the radial direction. Since the outer diameter of the lock ball 80a is set to be larger than the thickness of the joint body 70, the lock ball 80a necessarily protrudes to at least one of the inner periphery side and the outer periphery side of the joint body 70. A seal slider 81 is provided in the joint main body 70 so as to be movable in the axial direction and biased forward (a direction approaching the connection target pipe T) by a spring 82. A seal ring 82 is fitted to the front end portion of the sealing slider 81, and an O-ring 88 that seals between the joint body 70 is fitted to the outer periphery of the rear end portion. Between the outer periphery of the sealing slider 81 and the inner periphery of the joint body 70, a ball pushing sleeve 89 is movable in the axial direction and is moved forward a side by the spring 83 (the lock ball 80a is pushed outward). Urged to be provided. The ball pushing sleeve 89 can be moved relative to the sealing slider 81 in the axial direction. Further, a stopper ring 74 for restricting advancement of the ball pushing sleeve 89 beyond a certain level is fitted to the outer periphery of the sealing slider 81.

  A sleeve 75 is provided on the outer periphery of the joint body 70 so as to be movable in the axial direction and biased forward (in the locking direction) by a spring 76. The rear end portion of the sleeve 75 is a pressing portion 77 that presses the lock ball 80a from the outer peripheral side, and a relief recess 78 for avoiding interference with the lock ball 80a is formed on the front inner periphery of the pressing portion 77. Has been. Further, on the inner periphery of the front end portion of the sleeve 75, there is formed a pushing slope 75a that pushes the receiving slope 71b on the outer periphery of the locking piece 71 from the rear to push the locking piece 71 toward the inner circumferential side (engagement position side). Has been. Further, a restricting portion 75b for restricting the displacement of the locking piece 71 at the engagement position to the release position side is formed in front of the pushing slope 75a.

  As shown in FIG. 6, the quick pipe joint C is always held at the release position where the locking piece 71 is retracted to the outer peripheral side from the engagement position with the connection target pipe by the spring 71c. At this time, in the lock mechanism 80, the sleeve 75 is retracted, and the lock ball 80a is displaced to the outer peripheral side, and a part of the lock ball 80a is fitted into the recess 78. Since the lock ball 80a is restricted from being displaced inward by the ball pushing sleeve 89, the sleeve 75 is held in the retracted position by the engagement between the relief recess 78 and the lock ball 80a. 71 is not pushed by the sleeve 75 and is not displaced in the engagement position direction (inner circumferential side). Further, the sealing slider 81 waits for the connection target tube T at a position where it advances forward from a predetermined connection position by the bias of the spring 83 and the stepped portion 84 is locked to the rear end of the ball pushing sleeve 89. ing.

  When connecting to the connection target pipe T from this state, if the adapter 73 is pinched with a finger and pushed in the direction of the connection target pipe T (forward a: arrow A3 direction), the connection target pipe T is inserted into the joint body 70. Then, the tip is brought into contact with the seal ring 82 of the seal slider 81. Further, the spring 82 is pushed to a predetermined depth against the bias of the spring 82. Then, the sealing slider 81 moves backward, and the stopper ring 74 pushes the ball pushing sleeve 89 and moves backward. Then, the lock ball 80 a is released by the bias of the spring 76 and is pushed at the rear end of the concave portion 78 to be displaced toward the inner peripheral side, and the sleeve 75 released from the engagement with the lock ball 80 a is pressed by the spring 76. Advance. As the sleeve 75 advances, the pushing slope 75a pushes the receiving slope 71b of the locking piece 71, whereby the locking piece 71 is pushed toward the inner peripheral side against the bias of the spring 71c. Displace to the engagement position. Thus, the pipe joint C and the connection target pipe T are connected.

  When the connection target tube T is disengaged from this engaged state (connected state), the sleeve 75 is pulled backward (in the direction of arrow A4) by hand. Then, the locking piece 71 is displaced to the release position on the outer peripheral side by the spring 71c, and the engagement with the connection target tube T is released. Further, in the lock mechanism 80, when the relief recess 78 corresponds to the lock ball 80a, the lock ball 80a pushed by the ball pushing sleeve 89 is pushed to the outer peripheral side and fitted into the escape recess 78. Along with this, the ball pushing sleeve 89 sinks into the inner peripheral side of the lock ball 80a and restricts the return to the inner peripheral side, and the sleeve 75 is locked by the engagement between the lock ball 80a and the relief recess 78. 71 is locked in the retracted position where it does not push. During this time, the sealing slider 81 pushes the connection target tube T while moving forward by the bias of the spring 82.

Japanese Patent No. 3002168

  As described above, in the conventional quick pipe joint, when connecting, the adapter 73 is pushed in the direction of the connection target pipe T (arrow A3 direction), and when it is released (released), the sleeve 75 is pushed (in the arrow A4 direction). There was a need to pull. That is, the conventional quick pipe joint has a poor operability because the direction in which the force is applied is opposite between when connecting and when releasing.

  In addition, since a lock ball that is easy to roll is used, it took time to assemble the quick fitting.

  Moreover, the conventional quick pipe joint cannot be used when the outer diameter of the pipe to be connected changes.

  Moreover, the conventional quick pipe joint has a risk of scratching the outer peripheral surface of the connection target pipe.

  This invention is made | formed in view of said problem, and makes it a subject to provide the quick pipe joint which does not use the lock ball which can apply a force to the same direction and can be connected and cancelled | released.

  Another problem is to provide a quick pipe joint that can be used even if the outer diameter of the pipe to be connected changes.

  Another object is to provide a rapid pipe joint that does not damage the outer peripheral surface of the connection target pipe.

  A quick pipe joint according to the present invention made to solve the problem is a cylindrical joint body in which a distal end portion of a connection target pipe is inserted and removed from the distal end side in the axial direction, and is slidably mounted on the joint body. A locking piece that is radially displaced between an engagement position that engages with the outer periphery of the distal end portion of the connection target pipe and a release position that dissociates the outer periphery of the distal end portion; And has a seal part at the tip, and is inserted into the joint body in an airtight state and presses the seal part in the axial direction between the tip of the pipe to be connected and the attachment stop position and the attachment are released. A cylindrical piston that moves between the non-attached stop position and the outer peripheral side of the joint body, and is guided so as to be movable in the axial direction, retreats from the distal end side of the joint body, and Displaced to the engagement position, locked, moved forward and moved forward A sleeve having a displacement locking portion for displacing the locking piece to the release position, and a first interposed between the joint body and the cylindrical piston and biasing the cylindrical piston toward the distal end side of the joint body And a second spring that is interposed between the joint body and the sleeve and biases the sleeve toward the distal end side of the joint body.

  By the said structure, it can connect by pushing a coupling main body toward the connection object pipe | tube, and can cancel | release by pushing a sleeve toward the connection object pipe | tube.

  Further, in the quick pipe joint having the above-mentioned configuration, the displacement lock portion restricts and locks a ring-shaped convex portion that restricts and locks the locking piece to the engagement position on the inner surface and the locking piece to the release position. It is good to have a ring-shaped recessed part and the said convex part has a level | step difference inner peripheral surface from which an internal diameter differs.

  Since the convex part of the displacement lock part has a step inner peripheral surface with different inner diameters, it is possible to connect pipes to be connected with different outer diameters.

  Moreover, the rapid pipe joint of the said structure WHEREIN: It is good to provide the curing ring which cures the said connection object pipe | tube at the front-end | tip part of the said coupling main body.

  Damage to the outer peripheral surface of the connection target pipe is suppressed.

  The joint body can be connected by pushing toward the connection target pipe, and can be released by pushing the sleeve toward the connection target pipe. That is, operability is good because the connection and release are pushed in the same direction.

It is a partial cross section figure of the quick pipe joint of Embodiment 1 which has a latching piece in an engagement position. FIG. 2 is a partial cross-sectional view of a quick pipe joint when a target pipe having an outer diameter larger than that of the connection target pipe of FIG. 1 is connected. It is the top view (a) and BB partial sectional view (b) of the joint main body of the quick pipe joint of FIG. It is a partial cross section figure of the quick pipe joint of Embodiment 1 which has a latching piece in a releasing position. It is a partial cross section figure of the quick pipe joint of Embodiment 2 which has a latching piece in an engagement position. It is sectional drawing of the conventional quick pipe joint which a latching piece exists in a releasing position.

  Embodiments of the present invention will be described in detail below based on the drawings.

(Embodiment 1)
The rapid pipe joint A of the present embodiment is configured such that it can be connected / removed to / from the connection target pipe T1 having an outer diameter of 7.6 mm and the connection target pipe T2 having an outer diameter of 8 mm with one touch.

  The pipe joint A includes a tubular joint body 1 in which the tip of the connection target pipe T1 or T2 is inserted and removed in the direction of the axis L, and an outer periphery of the tip of the connection target pipe T1 or T2 that is slidably attached to the joint body 1. And a locking piece 2 that is displaced in the radial direction between an engagement position that engages with the release position and a release position that dissociates the outer periphery of the tip portion.

  Further, the pipe joint A has a passage 3a communicating with the hole passage of the pipe to be connected T1 or T2, and has a seal portion 3b at the tip, and is inserted into the joint body 1 in an airtight state so that the seal portion 3b is disposed in the direction of the axis L. A cylindrical piston 3 that moves between a mounting stop position that is pressed against the mounting position and a non-mounting stop position that is released from mounting, and an outer peripheral side of the joint body 1 that is guided so as to be movable in the axis L direction. A sleeve 4 having a displacement lock portion 41 that moves backward from the distal end side to displace and lock the locking piece 2 to the engagement position and moves forward to the distal end side to displace the locking piece 2 to the release position; A first push spring (first spring) 5 interposed between the main body 1 and the cylindrical piston 3 and biasing the cylindrical piston 3 toward the distal end side of the joint main body 1, and between the joint main body 1 and the sleeve 4. A second push spring (first step) that biases the sleeve 4 toward the distal end side of the joint body 1. Includes a spring) 6.

  The joint body 1 has a cylindrical shape, and a connection target tube T1 or T2 is inserted into a front end portion thereof. The joint body 1 includes an adapter portion 12 that is screwed to the inner periphery of the rear end portion. A pipe (not shown) is connected to the adapter portion 12 by screwing.

  In the front end portion of the joint body 1, a pair of upper and lower cutout portions 11 penetrating from the inner periphery to the outer periphery is formed.

  The cutout 11 opens in a square shape when viewed from above and below, and its cross section orthogonal to the axis L is generally comb-shaped as shown in FIG. 3a. As shown in FIG. 3 b, the notch 11 has right-angle wall surfaces 11 a and 11 b that form 90 ° with the axis L.

  Each of the notches 11 accommodates a substantially U-shaped locking piece 2 in cross section. The locking piece 2 has a right-angle wall surface 2a in contact with the right-angle wall surface 11a of the notch 11 at the front end portion and a right-angle wall surface 2b in contact with the right-angle wall surface 11b at the rear end portion. The locking piece 2 has a convex portion 21 on the outer periphery of the front end and a convex portion 22 on the outer periphery of the rear end. The outer peripheral surface of the convex part 21 and the right-angle wall surface 2a are connected by the inclined surface 2c. The front end of the convex portion 22 forms a slope 2d.

  A piston 3 is provided in the joint body 1 so as to be movable in the direction of the axis L and urged forward (in the direction of arrow A1) by a first push spring 5. A ring-shaped guide pin 8 having an outer diameter smaller than the inner diameter of the connection target tube T1 or T2 is inserted in the front end portion of the piston 3 so that the tip portion protrudes from the front end portion of the piston 3. A packing 3b is fitted between the inner circumferential groove at the front end of the piston 3 and the outer circumferential groove of the guide pin 8, and an O-ring 3c for sealing between the joint body 1 is fitted to the outer circumference of the rear end. Has been.

  A sleeve 4 is provided on the outer periphery of the joint body 1 so as to be movable in the direction of the axis L and biased in the lock direction (arrow A1 direction) by a second push spring 6. The sleeve 4 includes a rear sleeve 42 and a displacement lock portion 41 that locks the engagement piece 2 by displacing it between the engagement position and the release position.

  The displacement lock portion 41 has ring-shaped concave portions 41a and 41b into which the convex portions 21 and 22 of the locking piece 2 are fitted when slid forward (in the direction of arrow A1). On the front end side of the concave portion 41a, a ring-shaped convex portion 41c having step inner peripheral surfaces 41c1 and 41c2 having different inner diameters (radial heights) is formed. The step inner peripheral surface 41c1 and the step inner peripheral surface 41c2 are connected by an inclined surface 41c3. Between the concave portions 41a and 41b, a convex portion 41d having step inner peripheral surfaces 41d1 and 41d2 having different inner diameters (radial heights) is formed.

  Next, the operation of this embodiment will be described.

  The sleeve 4 is connected to the connection target tube T1 or T2 from the state shown in FIG. 1 or FIG. 2 where the connection target tube T1 or T2 is pushed in the direction of arrow A1 by the piston 3 and the outer periphery is held by the locking piece 2. Push forward in the direction (forward arrow A1 direction). Then, the nipple portion of the connection target tube T engaged with the inclined surface 2e of the locking piece 2 moves in the arrow A1 direction and pushes the locking piece 2 in the outer peripheral direction, and at the same time, the convex portion 21 of the locking piece 2 The inclined surface 2c slides into contact with the inclined surface 41a1 of the concave portion 41a of the displacement lock portion 41, the inclined surface 2d slides into contact with the inclined surface 41b1, the convex portion 21 of the locking piece 2 slides into the concave portion 41a, and the convex portion 22 slides into the concave portion 41b. The state shown in FIG. At this time, the first push spring 5 that pushes the piston 3 extends. On the other hand, the second push spring is urged (pulled) in the direction of arrow A2 in a contracted state.

  When the connection target tube T1 or T2 is connected from the released state shown in FIG. 4, the adapter portion 12 of the joint body 1 is pinched with a finger and moved toward the connection target tube T1 or T2, and the piston 3 has a front end portion. The packing 3b is brought into contact with the tip of the connection target tube T1 or T2. Next, when the adapter portion 12 is pushed in the direction of arrow A1, a force for moving the piston 3 and the joint body 1 in the direction of arrow A1 is applied. On the other hand, since the sleeve 4 is applied with a force that moves in the direction of the arrow A2, when the force that pushes the adapter portion 12 in the direction of the arrow A1 increases, the slope 2d of the locking piece 2 and the slope 41b of the displacement lock portion 41 are increased. The sleeve 4 moves (retreats) in the direction of arrow A2 overcoming the sliding friction force between them. Then, the locking piece 2 is pushed into the inner peripheral side by the displacement lock portion 41 and is displacement-locked to the engagement position where it engages with the connection target tube T1 or T2.

  At this time, when the pipe to be connected is T1, since the displacement of the locking piece 2 toward the inner peripheral side is large, the step inner peripheral surface 41c1 contacts the convex portion 21 and the step inner peripheral surface 41d1 contacts the convex portion 22. The connection state shown in FIG. When the pipe to be connected is T2, since the displacement of the locking piece 2 toward the inner peripheral side is small, the step inner peripheral surface 41c2 contacts the convex portion 21 and the step inner peripheral surface 41d2 contacts the convex portion 22 as shown in FIG. Will be connected.

  When releasing the connection target tubes T1 and T2 from this connection state (the state shown in FIG. 1 or 2), the sleeve 4 is pushed forward in the direction of the connection target tube T1 or T2 (forward arrow A1 direction). Then, the nipple portion of the connection target tube T1 or T2 engaged with the inclined surface 2e of the locking piece 2 moves in the direction of the arrow A1 and pushes the locking piece 2 to the outer peripheral side. The inclined surface 2c of the portion 21 is in sliding contact with the inclined surface 41a1 of the concave portion 41a of the displacement lock portion 41, the inclined surface 2d is in sliding contact with the inclined surface 41b1, the convex portion 21 of the locking piece 2 is in the concave portion 41a, and the convex portion 22 is in the concave portion 41b. It slips and it will be in the state shown in FIG.

  As described above, the quick pipe joint A of the present embodiment can be connected to the connection target pipe T1 or T2 by pushing the adapter portion 12 in the direction of the arrow A1. Further, the connection target pipe T1 or T2 can be released by pushing the sleeve 4 in the direction of the arrow A1. That is, since the connection and release can be performed simply by pressing in the same direction, the operability is good.

  Further, in the quick pipe joint A of the present embodiment, the convex portion 41c of the displacement lock portion 41 has step inner peripheral surfaces 41c1 and 41c2, and the convex portion 41d has step inner peripheral surfaces 41d1 and 41d2, so that the outer diameters are different. The connection target tubes T1 and T2 can be connected.

  Further, the rapid pipe joint A of the present embodiment has the following operational effects. That is, when releasing the connection target tubes T1 and T2 from this connection state (the state shown in FIG. 1 or 2), first, the sleeve 4 is pushed in the direction of the connection target tube T1 or T2 (forward arrow A1 direction). Then, since the connection target tube T1 or T2 is pushed forward by the urging force of the first pushing spring 5, the nipple portion of the connection target tube T1 or T2 is connected to the locking piece 2 via the inclined surface 2e of the locking piece 2. Tries to push out to the outer circumference. At the same time, the urging force of the second push spring 6 is increased and the joint body 1 is pushed in the direction of the forward arrow A1, so that the locking piece 2 moves in the direction of the forward arrow A1. As a result, the contact force between the connection target tube T1 or T2 and the locking piece 2 is reduced, and the sleeve 4 can be pushed forward by a weak force (can be released by simply pushing the sleeve 4 in the forward arrow A1 direction). Can do).

(Embodiment 2)
As shown in FIG. 5, the rapid pipe joint B of the present embodiment is configured such that a curing ring 9 covers the inner peripheral surface of the front end portion into which the connection target pipe of the cylindrical joint body 1 is inserted. Other than that, it is the same as the quick pipe joint A of the first embodiment, and the same components are denoted by the same reference numerals and description thereof is omitted.

  The curing ring 9 is made of an elastic member that does not damage even if it comes into contact with a metal connection target pipe, and is attached to the front end portion of the joint body 1 with a pin 9a. As the elastic member, a resin is preferable.

  In the rapid pipe joint B of the present embodiment, since the inner peripheral surface of the front end portion of the tubular joint body 1 into which the connection target pipe is inserted is covered with the curing ring 9, the connection target is connected at the time of connection with the connection target pipe and at the time of release. Does not damage the tube.

1 ························· Joint body 2 ·································· ···························· Cylindrical piston 3a・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Sleeve 41 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・··············· Displacement locks 41a and 41b ················································
41 c 1, 41 c 2, 41 d 1, 41 d 2 ..Step inner peripheral surface 5... 2nd spring 9 ... Curing ring

Claims (3)

A tubular joint body in which the distal end portion of the connection target pipe is inserted and removed from the distal end side in the axial direction;
A locking piece that is slidably mounted on the joint body and engages with the outer periphery of the distal end portion of the connection target pipe, and a locking piece that is radially displaced between a release position that dissociates the outer periphery of the distal end portion;
It has a passage communicating with the hole passage of the pipe to be connected and has a seal portion at the tip portion, and is inserted in the joint body in an airtight state so that the seal portion is axially connected to the tip portion of the pipe to be connected. A cylindrical piston that moves between a stop position at the time of mounting pressed against the stop position at the time of non-mounting when the mounting is released,
It is guided to the outer peripheral side of the joint main body so as to be movable in the axial direction, retreats from the front end side of the joint main body, displaces the locking piece to the engagement position, locks, advances to the front end side, and moves forward. A sleeve having a displacement lock portion for displacing the stop piece to the release position;
A first spring that is interposed between the joint body and the cylindrical piston and biases the cylindrical piston toward the distal end side of the joint body;
And a second spring interposed between the joint body and the sleeve and biasing the sleeve toward the distal end side of the joint body.   The displacement lock portion has a ring-shaped convex portion that restricts and locks the locking piece at the engagement position and a ring-shaped concave portion that restricts and locks the locking piece at the release position on the inner surface. The quick pipe joint according to claim 1, wherein the inner surfaces of the steps have different inner diameters.   The rapid pipe joint according to claim 1 or 2, further comprising a curing ring that cures the connection target pipe at a distal end portion of the joint body.

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