JP5613473B2 - Fitting and insertion guide - Google Patents

Description

  The present invention relates to a joint in which an insertion guide for assisting the insertion connection of a pipe is incorporated and an insertion guide in a plug-in joint used in, for example, a water supply system or a hot water supply system.

  Conventionally, as this type of joint, for example, the following pipe joint has been proposed (see Patent Document 1). The joint described in Patent Document 1 includes a tapered ring as an insertion guide in the joint body.

  This joint has an inner and outer double cylinder as a pipe connecting portion. Of the inner and outer cylinders, the inner cylinder is formed integrally with the joint body, and the outer circumference of the inner cylinder is provided with a seal ring groove, and an elastic seal ring is fitted in the seal ring groove. . On the other hand, the outer cylinder is formed separately from the joint body, and is coupled to the joint body so as to form a pipe insertion gap between the outer cylinder and the outer periphery of the inner cylinder.

  The tapered ring is fitted between the elastic seal ring and the retaining ring provided inside the outer cylindrical body on the joint end face side of the elastic seal ring. Here, the tapered ring has a shape in which the inner diameter expands forward (back side in the tube insertion direction).

  With such a structure as a joint, the tapered ring is pushed inward in the axial direction toward the back of the tube insertion gap by the tip of the tube at the time of tube insertion, so that the elastic seal ring becomes a seal ring groove. It is pushed in. This facilitates the insertion of the tube.

Japanese Patent Laid-Open No. 2004-232692

  However, in the conventional joint described in Patent Document 1, when a tube cut obliquely with respect to the tube axis is inserted, the tapered ring pressed by the tip of the obliquely cut tube is a single tapered ring. Sometimes overcame the elastic seal ring. Specifically, when the resin pipe cut obliquely is inserted, the tapered ring is inclined, and a part of the ring gets over the elastic seal ring. At this time, the frictional resistance when the inclined tapered ring abuts against the elastic seal ring is larger than that when the inclined ring is not inclined. Therefore, the installer may insert the pipe or the joint while rotating it in the circumferential direction in order to reduce the frictional resistance. By this rotation, the tapered ring is pushed by the inclined surface at the tip of the tube, and the probability that the ring will get over the seal ring is increased.

  In this way, if the tapered ring gets over the elastic seal ring before the tip of the tube and moves away from the tip of the tube, it cannot play its original role as an insertion guide.

  Accordingly, an object of the present invention is to provide a joint in which the insertion guide is difficult to get over the elastic seal ring even if the operator rotates the pipe or the joint, and an insertion guide used for the joint.

In order to achieve the above object, the present invention relating to a joint is provided with an annular insertion gap into which the end of the pipe is inserted in the joint body, and the inner surface of the insertion gap is sealed between the pipe and the pipe. The insertion member is provided with an insertion guide that is pressed by the distal end portion of the pipe to guide the insertion of the pipe, and the insertion guide has an annular shape, The peripheral surface includes a straight surface parallel to the central axis, an arc-shaped surface recessed from the straight surface, and a convex portion that can be locked to a seal member provided at an end of the arc-shaped surface. It is comprised and the front-end | tip of this convex part is formed in edge shape, It is characterized by the above-mentioned.

In the configuration of the previous reporting, in the insertion guide, the outer peripheral surface of the insertion guide is desirably a tapered-off shape.

Another invention according to the insertion guide has the configuration described in claim 1 or 2 .

  In the insertion guide of the present invention, since the convex portion that can be locked to the elastic seal ring is formed, even if a part of the insertion guide tries to get over the elastic seal ring by the obliquely cut tube, the convex portion Since it is locked to the elastic seal ring, it does not get over the elastic seal ring. Therefore, in this invention, there exists an effect that the function of an insertion guide can be exhibited effectively.

The half sectional view showing the joint in the embodiment of the present invention. (A) is a front view which shows an insertion guide, (b) is a sectional side view which shows an insertion guide. (A)-(c) is the fragmentary sectional view for demonstrating stepwise the state at the time of resin piping insertion in the coupling of embodiment. Sectional drawing showing the state of the insertion guide at the time of inserting the diagonally cut pipe | tube in the coupling of embodiment. (A)-(c) is sectional drawing showing another example in this invention, respectively.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
In this embodiment, it is an example about the coupling of the type which performs water stop in the inner periphery of the pipe inserted. The joint 10 in FIG. 1 shows only the plug joint among the joints used in one set in which the receiving side is a socket joint and the insertion side is a plug joint.

  The plug joint 10 is a one-push joint that can be connected simply by inserting the resin pipe 11 into an insertion gap 27 described later. The joint body 18 of the joint 10 is formed of engineering plastic, and is formed by an insert molding method using a metal connection member 19 such as brass or bronze (gunmetal) positioned on the outer periphery as an insert. A pair of annular grooves 23 are formed in the outer peripheral surface of the plug portion of the joint 10, that is, the inner surface of the insertion gap 27, and a rubber seal ring 24 as a seal member is provided in each annular groove 23. It is inserted. These seal rings 24 are configured to stop water between the outer peripheral surface of the joint body 18 and the inner peripheral surface of the socket joint.

  The joint body 18 has an inner cylinder portion 26 extending toward the pipe connection side of the joint 10, and a flow hole 33 through which a fluid flows is provided on the inner periphery of the inner cylinder portion 26. An annular insertion gap 27 is formed between the inner cylinder portion 26 and the outer cylinder body 30 screwed and fixed to the connection member 19. A pair of concave grooves 31 are provided on the outer peripheral surface of the inner cylinder portion 26 at a predetermined interval, and both concave grooves 31 are rubbers for contacting and stopping the inner peripheral surface of the resin pipe 11. An elastic seal ring 32 made of rubber is fitted, and grease is applied to the elastic seal ring 32. With these two elastic seal rings 32, the water stoppage between the outer peripheral surface of the inner cylinder portion 26 and the inner peripheral surface of the resin pipe 11 is enhanced.

  Further, a cap 38 is screwed into the tube connecting portion of the outer cylinder 30. An opening 40 through which the resin pipe 11 is inserted into the insertion gap 27 is provided on the inner periphery of the pipe connection portion of the cap 38. Moreover, the outer cylinder 30 is formed of a transparent resin, so that the inside of the insertion gap 27 is visualized.

  A retaining ring 41 made of a metal such as stainless steel and having a plurality of teeth is interposed between the outer cylinder 30 and the cap 38. Another retaining ring 44 is interposed between the retaining ring 41 and the inclined surface 43 on the inner periphery of the cap 38. These retaining rings 41 and 44 prevent the resin piping 11 from coming off.

Next, the insertion guide 50 will be described.
Between the retaining ring 41 and the seal ring 32, an insertion guide 50 is disposed that is pressed against the distal end surface of the resin pipe 11 and guides the insertion of the resin pipe 11. As shown in FIG. 2A, the insertion guide 50 has an annular shape. As shown in FIG. 2B, a convex portion 51 for locking to the elastic seal ring 32 is formed on the inner peripheral surface on the outer end side (right side of FIG. 2B) of the insertion guide 50. . The inner diameter of the convex portion 51 is substantially the same as the inner diameter of the resin pipe 11. The inner peripheral surface of the insertion guide 50 has a first inner diameter portion constituted by a straight surface 54 formed with a diameter larger than the outer diameter of the elastic seal ring 32 and an arc-shaped portion 55 extending from the surface 54 to the convex portion 51. 52 and a second inner diameter portion 53 constituted by the convex portion 51. A tapered surface 56 having a diameter reduced toward the inner end side is provided on the outer peripheral surface. Therefore, the convex portion 51 is formed by an arc-shaped portion 55 as a concave arc-shaped surface.

  The insertion guide 50 is made of a synthetic resin (engineering plastic) having rigidity such as polypropylene (PP), polyacetal (POM), polytetrafluoroethylene (PTFE), or the like.

Next, the effect | action is demonstrated about the coupling 10 comprised as mentioned above.
As shown in FIG. 3A, when the resin pipe 11 is inserted from the opening 40 of the cap 38, the distal end surface of the resin pipe 11 comes into contact with the contact surface 57 of the insertion guide 50 and is inserted by further pressing. The arc-shaped portion 55 of the guide 50 contacts the elastic seal ring 32. At this time, if the tube 11 is cut obliquely, a part of the insertion guide 50 tries to get over the elastic seal ring 32 as shown in FIG. Locked. At this time, even if the joint 10 or the resin pipe 11 is rotated, the insertion guide 50 continues to slide on the elastic seal ring 32 while maintaining the locked state. Hateful. When the resin pipe 11 is further pushed after the insertion guide 50 abuts against the elastic seal ring 32, the elastic seal ring 32 is pushed toward the concave groove 31 by the insertion guide 50, as shown in FIG. The insertion of the resin pipe 11 is guided. Subsequently, as shown in FIG. 3C, when the resin pipe 11 is further inserted, the insertion guide 50 advances to the innermost part of the insertion gap 27 and stops, and the insertion of the resin pipe 11 is completed.

The effects exhibited by the above first embodiment will be described together below.
(1) Since the insertion guide 50 is provided, the insertion resistance when the resin pipe 11 is inserted is reduced, and the insertion guide 50 is elastically sealed by the convex portion 51 provided at the outer end thereof. It is locked to. Therefore, even if a part of the insertion guide 50 tries to get over the elastic seal ring 32 by the resin pipe 11 that is obliquely cut, the elastic seal is used because the other part (the convex portion 51) is locked. It is difficult to get over the ring 32.

  Further, even when the resin pipe 11 and the joint 10 are rotated in the above-described locked state, the insertion guide 50 is locked in a state where the grease applied to the elastic seal ring 32 is used. Since it slides on the elastic seal ring 32 while maintaining it, it is difficult to get over the elastic seal ring 32.

  (2) Further, by providing such a convex portion 51, an appropriate insertion resistance can be given to the installer when the insertion guide 50 comes into contact with the elastic seal ring 32. Therefore, it is possible to suppress insufficient insertion due to the misunderstanding of the installer by clearly indicating in the instruction manual that there is resistance when the elastic seal ring 32 abuts. Furthermore, since the installer performs reinsertion with a certain amount of insertion force by intentionally making the installer feel the insertion resistance, it is possible to suppress the completion of insertion at a halfway position.

  (3) Since the inner diameter of the convex portion 51 is formed to be the same as the inner diameter of the resin pipe 11, the elastic seal ring 32 reduced in diameter by the insertion guide 50 is smoothly introduced into the resin pipe 11. The

  (4) Even when the resin pipe 11 is inserted obliquely and the elastic seal ring 32 is about to be pushed out, the inner peripheral surface of the insertion guide 50 has the surface 54, so that the elastic seal ring 32 is formed by the surface 54. The amount of protrusion from the groove 31 is limited. For this reason, the elastic seal ring 32 is less likely to protrude from the recessed groove 31 as compared with a conventional inner peripheral surface having a tapered shape.

(5) Since the arc-shaped portion 55 is provided on the inner peripheral surface of the insertion guide 50, the arc-shaped portion 55 serves as a guide surface, and the insertion guide 50 pushes the elastic seal ring 32 toward the concave groove 31. To make things smooth.
(Example of change)
In addition, this embodiment can also be changed and embodied as follows.

  The insertion guide 50 may have a water leakage function such as cutting out a part of the annular shape or providing a groove. Further, the insertion guide 50 may be provided with a through hole as a water leakage hole, or a thin portion may be provided in a part of the insertion guide, and the thin portion may be deformed by water pressure to leak water. When there is insufficient insertion by configuring the water leakage portion in this way, it is possible to detect a construction failure by intentionally leaking water during inspection or water flow.

  In the present embodiment, the insertion guide 50 is installed between the elastic seal ring 32 and the retaining ring 41. However, as shown by a broken line in FIG. May be arranged. In this case, the insertion guide 50 pressed toward the inner back side by the inserted resin pipe 11 expands the retaining ring 41 by the tapered surface 56 provided on the outer peripheral surface. Smooth insertion.

  In the insertion guide 50, as shown in FIG. 5A, the tip of the convex portion 51 may be formed in an edge shape. By making the tip of the convex portion 51 into an edge shape, the elastic seal ring 32 whose diameter is reduced by the insertion guide 50 is immediately introduced into the resin pipe 11 after the diameter reduction is completed. Therefore, it is difficult for the insertion guide 50 to get over the elastic seal ring 32 as compared with the case where the tip of the convex portion 51 is not edge-shaped. Further, as shown in FIG. 5B, the arc-shaped portion 55 on the inner peripheral surface may be a concave portion formed by two surfaces 54A and 54B having a straight section. One surface 54 </ b> A is a surface parallel to the central axis of the insertion guide 50. In this way, molding becomes easy. Moreover, as shown in FIG.5 (c), the circularly curved shape of the circular arc-shaped part 55 may be made small, and the shape dented largely may be sufficient. By adopting such a shape, the elastic seal ring 32 can easily enter the recess, and therefore, when the obliquely cut tube is inserted, it is easy to be locked to the elastic seal ring.

  -The pipe used may be a pipe made of metal such as copper or copper alloy, or a laminated pipe of metal and resin, in addition to the resin pipe.

  DESCRIPTION OF SYMBOLS 10 ... Joint, 11 ... Resin piping, 18 ... Joint main body, 27 ... Insertion gap, 30 ... Outer cylindrical body, 31 ... Concave groove, 32 ... Elastic seal ring, 38 ... Cap, 40 ... Opening, 41 ... Retaining ring , 43 ... slope, 44 ... retaining ring, 50 ... insertion guide, 51 ... convex part, 52 ... first inner diameter part, 53 ... second inner diameter part, 54A, 54B ... surface, 55 ... arc-shaped part.

Claims (3)

The joint body is provided with an annular insertion gap into which the end of the pipe is inserted, and a sealing member is provided on the inner surface of the insertion gap to seal between the pipe, and the tip of the pipe is provided in the insertion gap. A joint provided with an insertion guide that is pressed by the guide to guide tube insertion, wherein the insertion guide has an annular shape, and an inner peripheral surface of the insertion guide is a straight surface parallel to the central axis And an arcuate surface that is recessed from the straight surface, and a convex portion that can be locked to a seal member provided at an end of the arcuate surface, and the tip of the convex portion is formed in an edge shape . A joint characterized by that. The joint according to claim 1, wherein an outer peripheral surface of the insertion guide has a tapered shape. The insertion guide according to claim 1 or 2.

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