JP4636963B2 - Fitting - Google Patents

Description

  The present invention relates to a joint (pipe joint) that connects resin pipe ends, or an end of a resin pipe and a faucet device, for example, in a water supply / hot water supply piping system.

Conventionally, for example, as a joint that can be connected in a separable manner by inserting the end of a resin pipe with one touch, it is connected to a substantially cylindrical joint main body and the inside of the joint main body, and is built in the end of the resin pipe A substantially cylindrical inner cylinder, and a resin tube provided in the joint body and inserted into an insertion space formed between the inner circumferential surface of the joint body and the outer circumferential surface of the inner cylinder There has been proposed a structure constituted by a retaining ring for retaining the retaining member. (See Patent Document 1)
The retaining ring has a plurality of claw portions extending in an inclined state toward the radially inner side, and when a force in the pulling direction acts on the resin tube inserted in the insertion space, the retaining ring The claw portion of the ring bites into the outer peripheral surface of the resin tube so that the resin tube cannot be removed from the joint body.

A male screw part is provided on the outer peripheral surface of the base end part of the inner cylinder, and the male screw part is screwed into a female screw part provided on one end side of the inner peripheral surface of the joint main body. And the inner pipe is integrally connected. On the outer peripheral surface of the inner tube, an accommodation groove is formed in an annular shape so as to extend in the circumferential direction, and a seal member is fitted into the accommodation groove.
JP 2003-42370 A

  However, in the above-described conventional joint, when a strong pulling force is applied to the resin tube, the claw portion of the retaining ring bites into the outer peripheral surface of the resin tube, and further, the pulling force exceeding the limit is applied due to some factor. The claw portion of the retaining ring could be broken by the resin tube.

  In addition, since the inner cylinder is integrally fixed to the joint body, when an external force such as water hammer acts on the resin pipe, it is impossible to maintain an appropriate contact state between the inner peripheral surface of the resin pipe and the seal member. There was a problem that the sealing performance deteriorated.

  Further, since the seal member is disposed on the inner side and the outer side in the axial direction of the inner cylinder with respect to the claw portion of the retaining ring, when the resin tube is inserted into the insertion space of the joint, the seal member is more than the claw portion. There is a problem in that the resistance of the inner sealing member is large and the insertion cannot be performed quickly. In other words, the claw portion of the retaining ring exerts a large resistance to restrict the position on the outer peripheral surface of the resin tube, and the resin tube is placed on the outer peripheral surface of the seal member in a state where the attitude of the resin tube with respect to the inner cylinder is regulated When the inner peripheral surface is inserted, there is a problem that the insertion resistance increases and the resin tube cannot be smoothly inserted.

  The present invention has been made paying attention to the problems existing in the conventional technology as described above. The main purpose of the present invention is to provide a joint that can prevent the resin tube from being cut by the claw and improve the durability when a pulling force exceeding the limit is applied to the retaining ring.

  Another object of the present invention is to maintain the sealing performance by properly maintaining the contact state between the inner peripheral surface of the resin tube and the sealing material when an external force such as water hammer is applied in addition to the above object. It is to provide a joint that can.

  Furthermore, another object of the present invention is to provide a joint capable of smoothly inserting the resin pipe into the joint insertion space in addition to the main object.

In order to solve the above-mentioned problems, the invention according to claim 1 and 2 provides an end portion of a resin pipe inserted into the joint body by providing an inner cylinder in a joint body connectable by inserting an end portion of the resin pipe. In the joint provided with a retaining ring having a claw portion for preventing the resin pipe from coming out in the joint body, the inner cylinder is separated from the joint body. The resin pipe is formed at a position corresponding to the tip of the claw portion of the retaining ring that is elastically deformed when the resin pipe is inserted into the joint body with respect to the outer peripheral surface of the inner cylinder. The gist of the invention is to provide a recess that allows elastic deformation to the inner side in the radial direction of the inner cylinder.
In the first aspect of the present invention, the inner cylinder can be rotated around the central axis of the joint body relative to the joint body, and the central axis of the inner cylinder is inclined with respect to the central axis. It is connected so that it can swing.
In the invention according to claim 2, a contact surface that contacts the base end surface of the inner cylinder is formed on the inner peripheral surface of the joint main body, and close to the corresponding contact surface on the inner peripheral surface of the joint main body. Is formed with a fitting hole for loosely fitting the outer peripheral surface of the base end portion of the inner cylinder with a predetermined gap, and an annular first engaging groove is formed on the inner peripheral surface of the fitting hole along the circumferential direction. A second engagement groove is formed on the outer peripheral surface of the base end portion of the inner cylinder so as to correspond to the first engagement groove, and a connection ring is fitted into the first and second engagement grooves, and the connection By the ring, the inner cylinder is connected so as to be rotatable and swingable in the joint body.

The gist of a third aspect of the present invention is that, in the first or second aspect , the concave portion is an annular relief groove that is recessed in the entire circumferential direction with respect to the outer peripheral surface of the inner cylinder .

According to a fourth aspect of the invention, in any one of the first to third aspects, the invention is accommodated in an annular accommodating groove formed on the outer peripheral surface of the inner cylinder, and is in contact with the inner peripheral surface of the resin pipe. The gist of the present invention is that the sealing member is disposed on the distal end side of the inner cylinder with reference to the claw portion of the retaining ring.

A fifth aspect of the present invention is that, in any one of the first to fourth aspects, the depth dimension of the recess or the escape groove is set in a range of 0.1 to 1.0 mm. To do.

According to the first and second aspects of the present invention, when a pulling force exceeding the limit is applied to the retaining ring, the claw portion bites into the outer peripheral surface of the resin tube, and then the resin tube itself is in the radial direction. Since it is elastically deformed inward and enters the recess, the resin tube can be prevented from being cut and the durability can be improved.
Further, when inserting the resin tube into the joint insertion space, the resin tube can be rotated while being swung, and can be inserted while being swung slightly, so that the insertion operation can be performed smoothly. In addition, when the resin pipe is subjected to an excessive external force due to water hammer inside the resin pipe when the resin pipe is connected to the joint, the inner cylinder can also move in conjunction with the movement of the resin pipe. . As a result, the connection state of the resin tube with respect to the inner cylinder is stably maintained. It can be secured stably.

According to the third aspect of the present invention, since the recess is an annular relief groove, the forming operation can be easily performed, and the rotation of the retaining ring is prevented inside the joint body to The structure which respond | corresponds a recessed part and a nail | claw part becomes unnecessary, the attachment structure of a retaining ring can be simplified, and cost can be reduced.

According to the invention of claim 4 , in addition to the effects of the invention of any one of claims 1 to 3 , after the outer peripheral surface of the resin tube is regulated by the claw portion of the retaining ring, Since the inner peripheral surface of the resin tube is not newly brought into contact with the outer peripheral surface of the seal member, the operation of inserting the resin tube into the joint insertion space can be performed smoothly.

According to the invention described in claim 5 , in addition to the effect of the invention described in any one of claims 1 to 4 , it is not necessary to reduce the thickness of the inner cylinder, and therefore the rigidity of the inner cylinder is reduced. Can be secured.

Hereinafter, an embodiment in which the present invention is embodied in a joint that connects ends of resin pipes in a water supply / hot water supply piping system will be described with reference to the drawings.
As shown in FIG. 2, this joint is schematically seen as a substantially cylindrical joint main body 11 and an inner part fitted into the joint main body 11 and fitted into the inner peripheral surface of the end portion of the resin pipe P. The cylinder 12 is constituted by a retaining ring 16 that is held in place by a nut 15 screwed to the tip of the joint body 11 and that prevents the inserted resin pipe P from being detached. .

  A male screw portion 11a is threaded on the outer peripheral surface of the base end portion (left end portion in FIG. 1) of the joint body 11, and can be screwed into a pipe body such as a water pipe (not shown). An inner peripheral surface of the base end portion of the joint body 11 is formed in a step shape in which the inner diameter on the distal end side (the right end side in FIG. 1) is larger than the inner diameter of the base end portion. It is the contact surface 11b which contacts the base end surface 12a. Further, the inner diameter of the fitting hole 11c of the joint body 11 at the distal end side than the contact surface 11b is formed to be slightly larger than the outer diameter of the outer peripheral surface 12b of the base end portion of the inner cylinder 12, and the fitting hole 11c. And a slight gap G is formed between the outer peripheral surface 12 b of the inner cylinder 12.

  An annular receiving groove 12c is formed in the circumferential direction on the outer peripheral surface 12b of the base end portion of the inner cylinder 12, a seal ring 13 is fitted into the receiving groove 12c, and is in contact with the inner peripheral surface of the fitting hole 11c. The sealing performance of the gap G is always ensured. An annular first engagement groove 11d is formed in the insertion hole 11c in the circumferential direction, and the base end outer peripheral surface 12b is similarly annularly annular in the circumferential direction so as to correspond to the first engagement groove 11d. Two engagement grooves 12d are formed. A C-ring 14 as a connection ring is fitted into the first engagement groove 11d and the second engagement groove 12d. A tapered guide slope 11e is formed on the leading edge (right end in FIG. 1) of the fitting hole 11c so as to increase in diameter as the distance from the leading edge increases. At the time of mounting, the C-ring 14 is guided to the first engagement groove 11d side while reducing the diameter.

  The connecting operation of the inner cylinder 12 to the joint body 11 is performed as follows. First, before the inner cylinder 12 is inserted into the joint body 11, the C-ring 14 is engaged with the second engagement groove 12d of the inner cylinder 12 in FIG. The inner cylinder 12 is inserted, and the C-ring 14 is elastically deformed in the diameter reducing direction by the guide slope 11e. When the proximal end surface 12a of the inner cylinder 12 is brought into contact with the contact surface 11b, the C-ring 14 having a reduced diameter is moved to the position of the first engagement groove 11d. The diameter is expanded by the elastic restoring force, and the outer peripheral portion of the C ring 14 remains in the first engagement groove while the inner peripheral portion of the C ring 14 is engaged with the second engagement groove 12d as shown in FIGS. As a result, the inner cylinder 12 is connected to the joint body 11 so as to be rotatable and swingable.

  A housing hole 11f of the resin pipe P is formed on the inner peripheral surface of the joint body 11 so as to be continuous with the leading edge of the guide slope 11e. A tapered surface 11g having a diameter is formed, a stepped contact portion 11h is formed at the tip edge of the taper surface 11g, and a female screw portion 11i is formed at the tip side of the contact portion 11h. . A male screw portion 15a formed on the outer peripheral surface of the nut 15 is screwed into the female screw portion 11i, and a pair of retaining rings 16 are provided between the contact portion 11h and the inner end surface 15b of the nut 15. A spacer 17 is interposed between the retaining rings 16. The retaining ring 16 includes a plurality of claw portions 16 a that are inclined radially inward and toward the inside of the joint body 11. The claw portions 16a are formed at an equal pitch, for example, at 10 to 20 locations.

  An abutting surface 12e that abuts the end surface of the resin tube P is formed at the distal end edge of the outer peripheral surface 12b of the base end portion of the inner cylinder 12, and the inner peripheral surface of the end portion of the resin tube P is continuous with the abutting surface 12e. A cylindrical outer peripheral surface 12f is formed to be fitted into the. The outer peripheral surface 12f is formed with annular accommodating grooves 12g and 12h in the circumferential direction, and seal grooves 18 and 19 that are in contact with the inner peripheral surface of the resin pipe P are accommodated in the respective grooves.

  Between the accommodation hole 11f of the joint body 11, the inner peripheral surface 15c of the nut 15 and the claw portion 16a of the retaining ring 16, and between the outer peripheral surface 12f of the inner cylinder 12 and the seal rings 18 and 19, An insertion space 20 into which the tube P is inserted is formed. The seal rings 18 and 19 maintain the sealing performance between the inner peripheral surface of the resin pipe P and the outer peripheral surface 12f of the inner cylinder 12. As shown in FIG. 1, the seal rings 18 and 19 are disposed on the distal end side of the inner cylinder 12 with reference to the distal end portion of the claw portion 16 a of the retaining ring 16.

  Next, the operation of inserting the resin pipe P into the joint insertion space 20 will be described. First, the end of the resin pipe P is inserted into the insertion space 20 of the joint of FIG. The outer peripheral surface of the seal ring 19 is pressed in the direction of diameter reduction by the inner peripheral surface of the resin tube P, and then the outer peripheral surface of the seal ring 18 is pressed, and the outer peripheral surface of the end portion of the resin tube P is prevented from coming off. When the claw portion 16a of the ring 16 is elastically deformed and moved in the diameter increasing direction and the end surface of the resin tube P contacts the contact surface 12e of the inner cylinder 12, the connecting operation of the resin tube P to the joint is completed. As shown in FIG. 2, in the state where the resin pipe P is connected to the joint, when an external force in the normal pulling direction acts on the resin pipe P, the claw portion of the retaining ring 16 as shown by the solid line in FIG. 16a bites into the outer peripheral surface of the resin pipe P and is prevented from being pulled out.

Next, the configuration of the main part of the present invention will be described.
An annular relief groove 12i is formed on the outer peripheral surface 12f of the inner cylinder 12 as a recess in the circumferential direction so as to correspond to the claw portions 16a and 16a of the retaining rings 16 and 16. The depth dimension of the escape groove 12i is set in the range of 0.1 to 1.0 mm. The resin pipe P is allowed to elastically deform inward in the radial direction by the escape groove 12 i of the inner cylinder 12. Both side surfaces of the escape groove 12i in the axial direction are chamfered to 60 °, for example.

The effects obtained by this embodiment will be described below.
(1) In the above embodiment, the relief groove 12i is formed on the outer peripheral surface 12f of the inner cylinder 12 so as to correspond to the tip of the claw portion 16a of the retaining ring 16, so the resin pipe P is connected to the joint. 2, when an external force in the normal pulling direction acts on the resin pipe P, the tip edge of the claw portion 16a of the retaining ring 16 is the outer peripheral surface of the resin pipe P as shown by the solid line in FIG. Biting into is prevented from being pulled out. When an excessive external force in the pulling direction is applied to the resin pipe P, the resin pipe P is elastically deformed to the escape groove 12i side by the claw portions 16a as shown in FIG. Therefore, excessive cutting into the outer peripheral surface of the resin tube P by the claw portion 16a is prevented, and the resin tube P is prevented from being cut, so that durability can be improved.

  (2) In the above embodiment, the base end surface 12a and the base end portion outer peripheral surface 12b of the inner cylinder 12 are loosely inserted with a gap G into the contact surface 11b and the insertion hole 11c of the joint body 11, and the first and second The joint main body 11 and the inner cylinder 12 are connected by the C ring 14 engaged with the engaging grooves 11d and 12d, and the resin pipe P is rotatable inside the inner cylinder 12, and as shown in FIG. The central axis O1 of the inner cylinder 12 is connected so as to be swingable in a direction in which the central axis O2 of the inner cylinder 12 is inclined. For this reason, when inserting the resin pipe P into the insertion space 20 of the joint, the resin pipe P can be inserted while being rotated and swung, and the insertion operation can be performed smoothly.

  Further, when the resin pipe P is connected to the joint and the resin pipe P receives an excessive external force due to water hammer inside the resin pipe P, the connection state of the resin pipe P to the inner cylinder 12 is stabilized. Since it is held, the contact state between the seal rings 18 and 19 and the inner peripheral surface of the resin pipe P can be appropriately held, and the sealing performance can be stably secured.

  (3) In the above embodiment, since the relief groove 12i of the inner cylinder 12 is set in the range of 0.1 to 1.0 mm, it is not necessary to reduce the thickness of the inner cylinder 12, and accordingly, the inner cylinder 12 Rigidity can be ensured.

  (4) In the above embodiment, since the positions of the seal rings 18 and 19 attached to the outer peripheral surface 12f of the inner cylinder 12 are set on the outer side with respect to the tip of the claw portion 16a of the retaining ring 16, the claw Before the position of the outer peripheral surface of the resin tube P is regulated by the portion 16a, the operation of inserting the seal rings 18 and 19 into the inner peripheral surface of the resin tube P is completed, so that the operation of inserting the resin tube P into the insertion space 20 is performed. It can be done smoothly.

In addition, the said embodiment can also be changed and comprised as follows.
Although not shown, a separate inner cylinder 12 may be fixed to the joint body 11. Further, the joint body 11 and the inner cylinder 12 may be integrally formed so that the inner cylinder 12 cannot be separated from the joint body 11.

Although not shown, either one of the seal rings 18 and 19 may be omitted.
Although not shown, the inner cylinder 12 is non-rotatably connected to the joint body 11, and the retaining ring 16 is unrotatably accommodated with respect to the joint body 11, and the claw portion 16 a of the retaining ring 16 The number may be reduced to 3 to 5, for example, and a recess that allows elastic deformation of the resin tube P may be formed on the outer peripheral surface of the inner cylinder 12 corresponding to each claw portion 16a.

  Although not shown, instead of the C ring 14 as a connecting ring, an elastically deformable locking claw is provided on the outer peripheral surface of the endless annular ring, and the locking claw is locked in the first engagement groove 11d. By doing so, the coupling body 11 and the inner cylinder 12 may be connected.

The half sectional view of the state before the connection of the resin pipe which shows one Embodiment which actualized the coupling of this invention. The half sectional view showing the state where the resin pipe was connected to the joint. The half sectional view which shows the rocking | fluctuation state of the inner cylinder which connected the resin pipe to the coupling. The perspective view which shows an inner cylinder and C ring. The cross-sectional view of the joint passing through the C-ring. The partial expanded sectional view for demonstrating the effect | action of the nail | claw part of a retaining ring.

Explanation of symbols

  G ... Gap, P ... Resin pipe, O1, O2 ... Center axis, 11 ... Joint body, 11b, 12e ... Abutment surface, 11c ... Insertion hole, 11d ... First engagement groove, 12 ... Inner cylinder, 12a ... Base End surface, 12b ... Outer peripheral surface of base end portion, 12c, 12g, 12h ... Housing groove, 12d ... Second engaging groove, 12f ... Outer peripheral surface, 12i ... Relief groove as recess, 16 ... Retaining ring, 16a ... Claw .

Claims (5)

An inner cylinder is provided in a joint body that can be connected by inserting an end portion of the resin pipe, and the inner cylinder is fitted into an end portion of the resin pipe that is inserted into the joint body. In the joint provided with a retaining ring having a claw portion for preventing the resin tube from coming out,
The inner cylinder is formed separately from the joint body, and the claw part of the retaining ring is elastically deformed when the resin tube is inserted into the joint body with respect to the outer peripheral surface of the inner cylinder. A recess is provided at a corresponding position to allow the resin tube to be elastically deformed radially inward of the inner cylinder ,
The inner cylinder is connected to the joint main body so as to be rotatable around a central axis of the joint main body and to be swingable in a direction in which the central axis of the inner cylinder is inclined with respect to the central axis. Fittings. An inner cylinder is provided in a joint body that can be connected by inserting an end portion of the resin pipe, and the inner cylinder is fitted into an end portion of the resin pipe that is inserted into the joint body. In the joint provided with a retaining ring having a claw portion for preventing the resin tube from coming out,
The inner cylinder is formed separately from the joint body, and the claw part of the retaining ring is elastically deformed when the resin tube is inserted into the joint body with respect to the outer peripheral surface of the inner cylinder. A recess is provided at a corresponding position to allow the resin tube to be elastically deformed radially inward of the inner cylinder ,
A contact surface that contacts the base end surface of the inner cylinder is formed on the inner peripheral surface of the joint body, and an outer periphery of the base end portion of the inner cylinder is formed on the inner peripheral surface of the joint body in the vicinity of the contact surface. An insertion hole for loosely fitting the surface with a predetermined gap is formed, and an annular first engagement groove is formed along the circumferential direction on the inner peripheral surface of the insertion hole, and the base end portion outer peripheral surface of the inner cylinder is formed. Is formed with a second engagement groove corresponding to the first engagement groove, and a connection ring is fitted into the first and second engagement grooves. A joint characterized in that the tubes are connected so as to be rotatable and swingable . 3. The joint according to claim 1 , wherein the concave portion is an annular relief groove that is recessed in the entire circumferential direction with respect to the outer peripheral surface of the inner cylinder. In any one of claims 1 to 3, accommodated in an annular accommodation groove formed in the outer peripheral surface of the inner cylinder, and the sealing member to be contacted with the inner peripheral surface of the resin tube, the retaining ring The joint is characterized in that it is arranged on the tip side of the inner cylinder with reference to the claw portion of the inner cylinder. The joint according to any one of claims 1 to 4 , wherein a depth dimension of the recess or the escape groove is set in a range of 0.1 to 1.0 mm.

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