JP2011179633A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint, preventing a lock ring from being carelessly released from biting into a pipe body. <P>SOLUTION: A cover 42 is mounted to the outer peripheral part of a cap 18 of the pipe joint 10. In the state where the cover 42 is detached from the outer peripheral part of the cap 18, a push-in preventive part 42B of the cover 42 interferes with a tool, a sealing cap provided on the outer peripheral part of a pipe, a sheath pipe, and a protective pipe to inhibit a release ring 22 from being pushed into the inner part of the cap 18. Thus, a claw part 30B of the lock ring 30 can be prevented from being carelessly released from biting into a pipe 40 so that the pipe 40 can be prevented from being carelessly separated from the pipe joint 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pipe joint capable of reliably connecting and disconnecting a pipe body with a simple operation.

  2. Description of the Related Art Conventionally, there has been known a pipe joint in which a pipe body can be reliably coupled and detached by a simple operation (see, for example, Patent Document 1). In this pipe joint, the release ring and the lock ring are covered with a cap. By inserting a cylindrical jig into the gap between the cap and the tube, the release ring is pushed into the lock ring and the diameter of the lock ring is increased. By doing so, the tube can be removed.

JP 2006-316877 A

  However, even if a special jig is not used in such a pipe joint, for example, the release ring is pushed to the lock ring side by a sheath pipe, a protective pipe, etc. provided on the outer periphery of the pipe body. There is a risk that the lock ring bites into the tube.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a pipe joint that can prevent the lock ring from biting into the pipe body inadvertently.

  The pipe joint according to the first aspect of the present invention includes a joint main body in which an insertion hole into which a pipe body is inserted is formed, and a claw portion that is attached to the joint main body and extends to the inner peripheral side of the pipe body. A lock ring that bites into the outer peripheral surface and prevents the tube body from being pulled out, and is externally attached to the joint body, holds the lock ring on the joint body, and abuts against the lock ring so that the tube of the claw portion A cap having a tapered surface that prevents the body from coming off; and a release ring that is inserted into the cap and enters between the claw portion and the tubular body to release the claw portion from biting into the tubular body. A push-in preventing portion that is detachably attached to the outer peripheral portion of the cap and protrudes inward from the cap to prevent the release ring from being pushed into the back side of the cap. The cap formed at the end Has an over, the.

  In the pipe joint according to claim 1, an insertion hole into which the pipe body is inserted is formed in the joint body, and a lock ring is attached to the joint body. Further, the lock ring is held on the joint body by a cap that is externally inserted into the joint body. When the tube body is inserted into the insertion hole, the lock ring comes into contact with the taper surface of the cap due to the action of internal pressure, etc., and the claw portion of the lock ring bites into the tube body to prevent the tube body from coming out of the insertion hole. . On the other hand, when removing the tube body from the insertion hole, remove the cover attached to the outer periphery of the cap, and then push the release ring into the back of the cap with a jig, etc. It enters between the claw portion and the tube body, the biting of the claw portion of the lock ring into the tube body is released, and the tube body can be pulled out from the insertion hole. For this reason, in the state where the cover attached to the outer periphery of the cap is not removed, the cap push-in prevention part is released by interfering with a jig, a sheath pipe, a protective pipe, etc. provided on the outer periphery of the tube. Prevent the ring from being pushed into the back of the cap. As a result, the biting of the lock ring into the tubular body can be prevented from being inadvertently released.

  According to a second aspect of the present invention, in the pipe joint according to the first aspect, the push-in preventing portion of the cover extends from the inner peripheral portion of the release ring toward the inner peripheral side. .

  In the invention according to claim 2, since the push-in preventing portion of the cover extends toward the inner peripheral side more than the inner peripheral portion of the release ring, the biting into the tubular body of the lock ring is inadvertently released. Can be surely prevented.

  According to a third aspect of the present invention, in the pipe joint according to the first or second aspect, the cover protrudes toward the inner peripheral side at an end portion on the opposite side to the push-in preventing portion of the cover, and is engaged with the cap. And an engagement portion for preventing the cover from falling off the cap.

  In the invention according to claim 3, the cover is removed from the cap by engaging the engaging portion protruding toward the axial center side of the joint body from the end portion on the opposite side in the axial direction with the push-in preventing portion of the cover. It can be prevented from falling off.

  According to a fourth aspect of the present invention, in the pipe joint according to any one of the first to third aspects, the cover has a slit formed along an axial direction, and the cap is formed by widening the slit. It is possible to attach to and detach from.

  In the invention according to claim 4, since the slit is formed along the axial direction in the cover, the cover can be easily attached to and detached from the cap by widening the slit.

  According to a fifth aspect of the present invention, in the pipe joint according to any one of the first to fourth aspects, the material of the cover and the material of the cap are the same.

  In the fifth aspect of the present invention, since the material of the cover and the material of the cap are the same, the cap and the cover can be prevented from damaging each other when the cover and the cap come into contact with each other. Also, chemical adverse effects between different resins can be prevented.

  As described above, the pipe joint according to the first aspect of the present invention can prevent the lock ring from biting into the pipe body inadvertently.

  The pipe joint of the present invention according to claim 2 can reliably prevent the biting of the lock ring into the pipe body from being inadvertently released.

  The pipe joint according to the third aspect of the present invention can prevent the cover from falling off the cap.

  In the pipe joint according to the fourth aspect of the present invention, the cover can be easily attached and detached.

  The pipe joint of the present invention according to claim 5 can prevent the cap and the cover from damaging each other. Further, chemical adverse effects between different resins can be prevented.

It is a pipe joint which concerns on one Embodiment of this invention, Comprising: It is a half sectional view which shows the state which couple | bonded the pipe body. It is a pipe joint which concerns on one Embodiment of this invention, Comprising: It is a semi-sectional view which shows the state which removed the cover and inserted the jig | tool. It is the perspective view seen from the jig | tool insertion side which shows the cover used for the pipe joint which concerns on one Embodiment of this invention. It is the perspective view seen from the axial direction opposite side of the jig | tool insertion side which shows the cover used for the pipe joint which concerns on one Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 shows a state in which pipes in a pipe joint according to an embodiment of the present invention are coupled, and FIG. 2 shows a state in which a jig in the pipe joint shown in FIG. 1 is inserted. Yes.

  As shown in FIGS. 1 and 2, in the pipe joint 10, a joint body 16 is composed of a tubular main body portion 12 and a tubular intermediate portion 14 that is extrapolated to the main body portion 12. In addition, the pipe joint 10 includes a tubular cap 18 that is extrapolated to the intermediate portion 14, and a pipe (for example, a polybutene pipe) as a tubular body between the intermediate portion 14 and the cap 18 and the main body portion 12. An insertion hole 20 into which 40 is inserted is formed.

  A lock ring 30 for holding the pipe 40 in the insertion hole 20 is disposed inside the cap 18. The lock ring 30 has a substantially V-shaped cross section, and is disposed such that a substantially V-shaped opening 30 </ b> A is directed to the back side of the joint body 16. Then, the opening 30A of the lock ring 30 faces the tip section 14A having a triangular cross section of the intermediate section 14, and a part of the inner side surface of the opening 30A is in contact with the tip section 14A. Further, a tapered surface 18 </ b> A with which the substantially V-shaped outer surface of the lock ring 30 can abut is formed on the inner wall of the cap 18. The tapered surface 18A is reduced in diameter toward the inlet 20A side of the insertion hole 20.

  A release ring 22 that is movable in the axial direction (front-rear direction) of the pipe joint 10 is inserted inside the cap 18 closer to the inlet 20 </ b> A of the insertion hole 20 than the lock ring 30. In the release ring 22, the inner wall forms a part of the insertion hole 20, and the protrusion 22 </ b> A formed on the outer periphery of the release ring 22 abuts on the small diameter portion 18 </ b> B formed on the inner periphery of the cap 18. The cap 18 is prevented from coming off. Further, two circumferential grooves 12 </ b> A are formed in the outer peripheral surface facing the insertion hole 20 in the main body portion 12, and rubber O-rings 24 are fitted in these circumferential grooves 12 </ b> A, respectively.

  An expanded wall surface 13 is formed in the innermost portion of the insertion hole 20 of the main body 12, and this wall surface 13 serves as a stopper for the pipe 40. A male screw 12B to which another pipe is connected is formed at the end of the main body 12 opposite to the insertion hole 20 in the axial direction, and a spanner is hung on the middle of the main body 12. A hexagonal portion 12C is formed.

  As an example, the main body 12 is made of bronze or brass, the intermediate part 14, the cap 18 and the release ring 22 are made of resin, and the lock ring 30 is made of stainless steel, but each member is limited to these materials. Instead, other materials may be used. Further, the pipe 40 may be made of polybuden, cross-linked polyethylene (PEX), or other relatively soft member into which the claw portion 30B of the lock ring 30 can bite.

[Composition of cover]
3 and 4 show the cover 42 used in the pipe joint 10 shown in FIGS. 1 and 2 together with the cap 18. 3 is a perspective view of the pipe joint as viewed from the jig insertion side, and FIG. 4 is a perspective view of the pipe joint as viewed from the side opposite to the jig insertion side in the axial direction.

  As shown in FIG. 3, the cover 42 has a substantially cylindrical shape, and a slit 44 along the axial direction is formed at one place in the circumferential direction. The slit 44 divides the cover 42, and the cover 42 can be attached to the outer peripheral portion of the cap 18 and can be removed from the outer peripheral portion of the cap 18 as shown in FIG. 1 by widening the slit 44. It has become.

  Further, the main body portion 42A of the cover 42 has a cylindrical shape, and the portion of the main body portion 42A on the pipe 40 (see FIG. 1) insertion port side is an inclined portion 42B that is reduced in diameter toward the distal end side. From the insertion port side end portion 42C that is the insertion port side of the pipe 40 (see FIG. 1) of the inclined portion 42B, the push-in prevention portion 42D toward the shaft center P1 side (inner peripheral side) of the joint body 16 of the pipe joint 10. Projectingly formed. A plurality of push-in preventing portions 42D are formed at predetermined intervals in the circumferential direction of the insertion port side end portion 42C of the cover 42. In the present embodiment, four push-in prevention portions 42D are formed at equal intervals in the circumferential direction of the insertion port side end portion 42C of the cover 42. In addition, rectangular notches 43 are formed between the adjacent push-in preventing portions 42D, and these notches 43 reach the intermediate portion in the axial direction of the inclined portion 42B.

  As shown in FIG. 1, the push-in preventing portion 42D of the cover 42 extends along the insertion port side end portion 18C of the cap 18, and the push-in preventing portion 42D is equal to or larger than the inner peripheral portion 22C of the release ring 22 ( It is the same as the inner peripheral portion 22C or extends from the inner peripheral portion 22C) toward the inner peripheral side (the axis P1 side of the joint body 16). For this reason, in a state where the cover 42 attached to the outer peripheral portion of the cap 18 is not removed, the push-in preventing portion 42D of the cover 42 is provided on the outer periphery of the jig 50 (see FIG. 2) or the pipe 40, It is possible to prevent the release ring 22 from being pushed into the back side of the cap 18 by interfering with a protective tube or the like (not shown).

  On the other hand, as shown in FIG. 2, when the cover 42 is removed from the cap 18, the release ring 22 can be pushed toward the inner side of the cap 18 by the cylindrical jig 50.

  The cover 42 may be attached to the cap 18 after the pipe 40 is inserted into the insertion hole 20 of the pipe joint 10, or the push-in prevention part 42 </ b> D and the inner peripheral part 22 </ b> C of the release ring 22 may be made the same. The pipe 40 may be connected to the pipe joint 10 with the cover 42 attached to the cap 18.

  As shown in FIG. 4, the push-in prevention portion 42 </ b> D of the cover 42 and the opposite insertion port side end portion 42 </ b> E on the opposite side in the axial direction face the axis P <b> 1 side (inner peripheral side) of the joint body 16 of the pipe joint 10. An engaging portion 42F is formed. A plurality of engaging portions 42F are formed at a predetermined interval in the circumferential direction of the end 42E on the side opposite to the insertion port of the cover 42. In the present embodiment, a total of five engaging portions 42F are formed at approximately equal intervals in the circumferential direction and in the vicinity of both sides of the slit 44 at the end 42E on the side opposite to the insertion port of the cover 42.

  As shown in FIG. 1, the engaging portion 42 </ b> F of the cover 42 extends along (beyons) the outer peripheral end 18 </ b> E of the anti-insertion port side end portion 18 </ b> D of the cap 18 along the anti-insertion port side end portion 18 </ b> D of the cap 18. The joint body 16 extends toward the axis P1 side (inner peripheral side). Therefore, as shown in FIG. 1, with the cover 42 attached to the cap 18, the engagement portion 42F of the cover 42 and the push-in prevention portion 42D move the cover 42 in the direction of the axis P1 relative to the cap 18. Is prevented, so that the cover 42 does not fall off (do not fall out) from the cap 18.

  Further, the material of the cover 42 and the material of the cap 18 are the same, and when the cover 42 and the cap 18 come into contact with each other, the cap 18 and the cover 42 can be prevented from damaging each other. Yes. In addition, chemical adverse effects between different resins can be prevented. The cover 42 is preferably made of a resin that can be injection molded, but may be a metal.

Next, the operation of this embodiment will be described.
As shown in FIG. 1, when the pipe 40 is inserted into the insertion hole 20 of the pipe joint 10 of the present embodiment, the tip of the pipe 40 expands the diameter of the lock ring 30. Then, the pipe 40 is inserted to the back side while the outer peripheral surface of the pipe 40 is in sliding contact with the claw portion 30 </ b> B of the lock ring 30, and the inner peripheral surface of the pipe 40 is in contact with the O-rings 24 and 24. When the pipe 40 is further inserted, the tip of the pipe 40 reaches the wall surface 13 of the main body 12. Thereafter, the cover 42 is attached to the cap 18. At this time, the cover 42 can be easily attached to the cap 18 by widening the slit 44 of the cover 42. The push-in preventing portion 42D is extended toward the inner peripheral side to the same position as the inner peripheral portion 22C of the release ring 22 (so as not to be buffered with the pipe 40), and the cover 42 is first attached to the cap 18. In the state, the pipe 40 may be connected to the pipe joint 10.

  In the pipe mounting state shown in FIG. 1, when an internal pressure is applied to the pipe 40, the pipe 40 receives a force in a direction in which the pipe 40 comes out of the joint body 16. As a result, the pipe 40 and the lock ring 30 are slightly moved in the direction of coming out of the insertion hole 20, and the outer peripheral side of the lock ring 30 hits the tapered surface 18 </ b> A of the cap 18. Thereby, the claw portion 30 </ b> B of the lock ring 30 bites into the outer peripheral side of the pipe 40. At this time, since the claw portion 30B of the lock ring 30 is inclined toward the back side of the joint body 16, the claw portion 30B is easy to bite into the pipe 40 and the claw portion 30B faces in a direction opposite to the direction in which the pipe 40 is pulled out. The pipe 40 is difficult to come off.

  Further, when the pipe 40 is detached from the pipe attachment state shown in FIG. 1, the cover 42 is removed from the cap 18 to obtain the state shown in FIG. At this time, the cover 42 can be easily removed from the cap 18 by widening the slit 44 of the cover 42.

  Next, a cylindrical jig 50 is inserted from the inlet 20 </ b> A side of the insertion hole 20, and the release ring 22 is pushed into the back side of the cap 18. As a result, the distal end portion 22B of the release ring 22 pushes the claw portion 30B of the lock ring 30 to expand the diameter of the lock ring 30. At that time, the distal end portion 22B of the release ring 22 pushes the claw portion 30B of the lock ring 30 and simultaneously enters between the claw portion 30B and the pipe 40, and the claw portion 30B is extracted from the pipe 40. In this state, the pipe 40 can be pulled out (detached) from the insertion hole 20.

  On the other hand, as shown in FIG. 1, in a state where the cover 42 is not removed from the cap 18, the push-in preventing portion 42 </ b> D of the cover 42 is provided with the jig 50 shown in FIG. Interference with a protective tube or the like prevents the release ring 22 from being pushed into the back side of the cap 18. For this reason, the biting of the claw portion 30B of the lock ring 30 into the pipe 40 can be prevented from being inadvertently released. As a result, it is possible to prevent the pipe 40 from being inadvertently detached from the pipe joint 10.

  Further, in this embodiment, the push-in preventing portion 42D of the cover 42 is not less than the inner peripheral portion 22C of the release ring 22 (same as the inner peripheral portion 22C or from the inner peripheral portion 22C) toward the inner peripheral side. Since it extends toward (the axis P1 side of the joint body 16), it is possible to reliably prevent the claw portion 30B of the lock ring 30 from being inadvertently released from the pipe 40.

  Further, in the present embodiment, as shown in FIG. 4, an engagement portion is formed on the end portion 42 </ b> E opposite to the push-in prevention portion 42 </ b> D of the cover 42 toward the axis P <b> 1 side of the joint body 16 of the pipe joint 10. 42F is formed. The engaging portion 42F extends from the outer peripheral end 18E of the anti-insertion port side end portion 18D of the cap 18 to the axial center P1 side (inner peripheral side) of the joint body 16 along the anti-insertion port side end portion 18D of the cap 18. It is extended. Therefore, as shown in FIG. 1, with the cover 42 attached to the cap 18, the engagement portion 42F of the cover 42 and the push-in prevention portion 42D move the cover 42 in the direction of the axis P1 relative to the cap 18. Is prevented and the cover 42 does not fall off the cap 18.

  In the present embodiment, since the material of the cover 42 and the material of the cap 18 are the same, the cap 18 and the cover 42 can be prevented from damaging each other when the cover 42 and the cap 18 come into contact with each other. . Further, chemical adverse effects between different resins can be prevented. Furthermore, the cover 42 according to the present embodiment does not need to be attached to all the pipe joints 10 and can be attached only to the pipe joints 10 where the pipes 40 may be accidentally detached. Are better.

[Other Embodiments]
Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, in the above embodiment, the push-in preventing portion 42D of the cover 42 is not less than the inner peripheral portion 22C of the release ring 22 (same as the inner peripheral portion 22C or from the inner peripheral portion 22C). However, the push-in prevention portion 42D projects at least from the insertion port side end portion 18C of the cap 18 to the inner peripheral side, and can prevent the release ring 22 from being pushed into the back side of the cap 18. If it is a structure, it is good also as a structure which does not reach the inner peripheral part 22C of the release ring 22 slightly.

  Further, the number and shape of the push-in preventing portion 42D in the cover 42 are not limited to the above embodiment. For example, it is sufficient that at least one push-in preventing portion 42D is formed. Further, the notch 43 of the cover 42 may be eliminated, and the push-in preventing portion 42D may be formed in a ring shape over the entire circumference.

  Further, the number and shape of the engaging portions 42F in the cover 42 are not limited to the above embodiment. For example, at least one engaging portion 42F may be formed. Further, the engaging portion 42F may be formed in a ring shape over the entire circumference.

  Further, the slit 44 in the cover 42 may not divide the cover 42. Further, the overall shape of the cover 42 may be appropriately changed according to the shape of the different cap 18. Furthermore, when the material of the cover 42 is sufficiently elastic and can be attached to and detached from the cap 18, a configuration without the slit 44 may be employed.

10 Pipe Joint 16 Joint Body 18 Cap 20 Insertion Hole 22 Release Ring 30 Lock Ring 40 Pipe (Tube)
42 Cover 42D Cover push-in prevention part 42F Cover engagement part 44 Slit 50 Jig

Claims (5)

A joint body in which an insertion hole into which the tubular body is inserted is formed;
A lock ring that is attached to the joint main body and that extends to the inner peripheral side bites into the outer peripheral surface of the tubular body to prevent the tubular body from coming out;
A cap provided with a tapered surface that is extrapolated to the joint main body, holds the lock ring on the joint main body, and abuts against the lock ring to prevent the claw portion from coming off from the tubular body;
A release ring which is inserted into the cap and enters between the claw portion and the tube body to release the claw portion from biting into the tube body,
A push-in preventing portion, which is detachably attached to the outer peripheral portion of the cap and protrudes from the cap toward the inner peripheral side to prevent the release ring from being pushed into the back side of the cap, has an insertion port side end of the tubular body A cover formed on the part,
Pipe fittings with   2. The pipe joint according to claim 1, wherein the push-in preventing portion of the cover is extended toward the inner peripheral side of the release ring.   The cover has an engaging portion that protrudes inwardly at an end opposite to the push-in preventing portion in the axial direction, engages with the cap, and prevents the cover from falling off the cap. The pipe joint according to claim 1 or 2, wherein the pipe joint is characterized.   The said cover is formed with the slit along an axial direction, The attachment or detachment with respect to the said cap is attained by widening the said slit, The any one of Claims 1-3 characterized by the above-mentioned. Pipe fittings.   The pipe joint according to any one of claims 1 to 4, wherein a material of the cover and a material of the cap are the same.

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