JP5496790B2 - Fitting - Google Patents

Description

  The present invention relates to a joint that is used in, for example, a water supply system or a hot water supply system piping system and connects between ends of resin pipes or connects an end of resin pipes and a faucet device. It is.

  Generally, this type of joint is provided with, for example, an inner cylindrical body, a concave groove is provided in the inner cylindrical body, and an elastic seal ring is disposed in the concave groove. The elastic seal ring performs water stop by contacting the inner diameter surface of the inserted resin pipe. However, there is variation in the diameter of the resin pipe, and the elastic seal ring is set to an outer diameter that can contact the inner diameter surface and stop water even if the resin pipe has an inner diameter upper limit. There was a need. Therefore, when a resin pipe having a lower inner diameter is inserted, the difference between the inner diameter of the resin pipe and the outer diameter of the elastic seal ring is increased, and the contact area between the resin pipe end surface and the elastic seal ring, that is, the contact pressure is increased. As a result, the elastic seal ring may be pushed out of the concave groove as the resin pipe is inserted. Furthermore, when the resin pipe cut obliquely with respect to the tube axis is inserted into the joint, the elastic seal ring is pressed by the most distal end portion of the inclined cut end surface. And the part pressed in the radial direction of the elastic seal ring is pushed out from the concave groove by further insertion of the resin pipe and protrudes.

  Therefore, conventionally, a joint described in Patent Document 1 is known as a joint for preventing the elastic seal ring from protruding. The joint described in Patent Document 1 is provided with a built-up portion for the purpose of preventing the elastic seal ring from protruding before and after the concave groove provided in the inner cylinder. The build-up portion provided in front of the concave groove expands the diameter of the inserted resin pipe, and as a result, the difference between the inner diameter of the resin pipe and the outer diameter of the elastic seal ring is reduced. Is prevented from protruding. Further, even if the elastic seal ring protrudes, the elastic seal ring is prevented from protruding because the elastic seal ring is held by the built-up portion provided at the rear portion of the groove.

JP 2004-308794 A

However, in the conventional joint described in Patent Document 1, the built-up portion sometimes has a large insertion resistance when the resin pipe is inserted.
The height of the built-up portion provided before and after the groove of the inner cylinder is set to be lower than the outer diameter of the elastic seal ring, but when the inner diameter of the resin pipe is close to the lower limit, The raised portion is a great resistance against the insertion of the resin piping. Furthermore, since the dimensions of the inner cylinder are designed with dimensions up to 1/100 and dimensional tolerances, the surface has been a smooth surface without so-called irregularities. For this reason, the surface of the inner cylinder formed by cutting or molding is also a smooth surface without unevenness. Thus, as described above, it was a resistance at the time of insertion.

  Accordingly, an object of the present invention is to provide a joint for reducing the resistance when the resin pipe abuts against the built-up portion provided in the inner cylinder when the resin pipe is inserted. .

  In order to achieve the above object, the joint of the invention according to claim 1 has a substantially cylindrical shape, and is provided with a joint body into which a resin pipe is inserted, a concave groove, and a resin in the concave groove. And an inner cylindrical body fitted with an elastic seal ring for stopping water in contact with the inner peripheral surface of the pipe, and preventing the elastic seal ring from protruding at the front and rear positions of the concave groove of the inner cylindrical body. It is a joint provided with a built-up portion for performing, and the gist is that an insertion force reducing processed portion is formed on the outer peripheral surface of the built-up portion.

The joint of the invention according to claim 2 is summarized in that, in claim 1, the insertion force reduction processed portion is provided with respect to the built-up portion provided on the front side of the groove.
The joint of the invention according to claim 3 is summarized in that, in claim 1 or claim 2, the insertion force reduction processed portion is an uneven treatment.

The gist of the joint of the invention according to claim 4 is that, in any one of claims 1 to 3, grease is applied to the insertion force reduction processed portion.
The joint of the invention according to claim 5 is characterized in that, in any one of claims 1 to 4, the insertion force reduction processed portion is formed along with the inner cylinder forming.

  In the joint according to the present invention, the contact area between the built-up portion and the inner diameter portion of the resin pipe can be reduced, and even if the inner diameter of the resin pipe becomes smaller, it is possible to reduce an excessive increase in insertion resistance.

Sectional drawing which shows the coupling in embodiment. Sectional drawing which expanded the inner cylinder body, the ditch | groove, the buildup part, and the elastic seal ring part of the joint in embodiment. (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 which provided the circumferential groove in the build-up part of the inner cylinder as another example. (A) and (b) are the side view and sectional drawing showing the state which provided the notch of the axial direction in the build-up part of the inner cylinder as another example.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.
As shown in FIG. 1, the joint 10 is a one-push joint that can be connected simply by inserting a resin pipe 11. An inner cylinder 13 is fitted into the joint body 12, and the position of the inner cylinder 13 is fixed by an outer cylinder 14 fitted to the joint body 12. Between the inner cylinder 13 and the outer cylinder 14, an annular insertion gap 15 into which the resin pipe 11 can be inserted is provided. The outer cylindrical body 14 is formed of a transparent resin, so that the insertion gap 15 can be visually observed, and the insertion state of the resin pipe 11 can be confirmed.

  A cap 24 is screwed into the resin pipe connecting portion of the outer cylindrical body 14. An opening 25 through which the resin pipe 11 is inserted into the insertion gap 15 is provided between the inner periphery of the outer end of the cap 24 and the inner cylinder 13.

  A retaining ring 26 made of a metal such as stainless steel and having a plurality of teeth is interposed between the outer cylindrical body 14 and the cap 24. Another retaining ring 28 is interposed between the retaining ring 26 and the inclined surface 27 on the inner periphery of the cap 24. These retaining rings 26 and 28 prevent the resin piping 11 inserted into the joint 10 from coming off.

  An insertion guide 29 is disposed between the retaining ring 26 and the elastic seal ring 21 fitted in the concave groove 19 so as to guide the insertion of the resin pipe 11 by being pressed against the distal end surface of the resin pipe 11. Is done.

Next, the inner cylinder and the built-up portion provided on the inner cylinder will be described.
The inner peripheral surface of the joint body 12 and the outer peripheral surface of the inner cylindrical body 13 are stopped by an elastic seal ring 17 fitted in a concave groove 16 provided on the outer peripheral surface of the inner cylindrical body 13. A flow hole 18 through which a fluid flows is provided in the inner periphery of the inner cylinder 13 and the joint body 12.

  A pair of concave grooves 19 and 20 are provided on the outer peripheral surface of the inner cylindrical body 13 at a predetermined interval. In both the concave grooves 19 and 20, an elastic seal ring 21 is fitted for stopping water in contact with the inner peripheral surface of the resin pipe 11 inserted and connected to the joint 10. In FIG. 2, a front build-up portion 22 is provided immediately before the left concave groove 19, and a rear build-up portion 23 is provided immediately after the right concave groove 20. The built-up portions 22 and 23 are annular. The cross-sectional shape of each of the built-up portions is the highest on the concave grooves 19 and 20 side, and has an inclined surface where the height of the built-up portion gradually decreases as the distance from the concave grooves 19 and 20 increases. A satin-like uneven surface 40 is provided as a force reduction processed portion. The matte textured surface 40 is provided on the molding surface of the mold for molding the inner cylinder 13 and is formed when the inner cylinder 13 is molded.

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 25 of the cap 24, the tip surface of the resin pipe 11 comes into contact with the insertion guide 29. When the resin pipe 11 is further inserted, as shown in FIG. 3B, the resin pipe 11 reaches the front-side built-up portion 22 and is expanded in diameter by the front-side built-up portion 22. At this time, since the uneven surface 40 is provided on the surface of the built-up portion, the contact area between the inner peripheral surface of the resin pipe 11 and the built-up portion 22 can be reduced. As a result, the inside of the resin pipe The frictional resistance between the peripheral surface and the built-up portion 22 is reduced, and the resin piping 11 can be inserted smoothly. Further, since the diameter of the elastic seal ring 21 is reduced by the insertion guide 29, the distal end portion of the resin pipe 11 can smoothly get over the elastic seal ring 21 without pushing out or damaging the elastic seal ring 21. I can do it. Subsequently, as shown in FIG. 3C, when the resin pipe 11 is further inserted, the insertion guide 29 advances to the innermost part of the insertion gap 15 and stops, and the insertion of the resin pipe 11 is completed.

  The joint body 12, the inner cylinder 13, the outer cylinder 14, the cap 24, the retaining ring 28, the insertion guide 29, etc. are made of synthetic resin (engineering) having rigidity such as polyacetal (POM), polyphenylene sulfide (PPS), etc. Plastic).

The effects exhibited by the above embodiment will be described collectively below.
(1) By providing the uneven surface 40 on the inclined surfaces of the built-up portions 22 and 23, the contact area with the inner peripheral surface of the resin pipe 11 can be reduced. As a result, the frictional resistance between the inner peripheral surface of the resin pipe 11 and the inclined surface of the built-up portion is reduced, so that the force required to insert the resin pipe 11 is reduced. For this reason, the resin piping 11 can be inserted smoothly.

  (2) By providing the concave / convex treatment surface 40 on the inclined surfaces of the built-up portions 22 and 23, thread-like chips attached to the cut surface of the resin pipe 11 tip surface catch on the concave / convex portion of the concave / convex treatment surface 40, and the elastic seal It becomes difficult to reach on the ring 21. Conventionally, there has been a case where chips are installed between two elastic seal rings and lead to water leakage. By adopting such a configuration, chips do not hang over the two elastic seal rings 21. Can suppress water leakage.

  (3) When applying grease to the front and rear positions of the elastic seal ring 21 for the purpose of reducing the insertion force, by providing the uneven surface 40 on the inclined surfaces of the built-up portions 22 and 23, the grease is held by the uneven portion. Therefore, it is easier to obtain the grease effect.

In addition, this embodiment can also be changed into the following forms and actualized.
In the present embodiment, the satin-like uneven surface 40 is used as the insertion force reduction process, but even with the following method, the same effects as in the present embodiment can be obtained. For example, as shown in FIG. 4, several circumferential grooves 41 may be provided in the built-up portions 22 and 23. Further, as shown in FIGS. 5A and 5B, a plurality of notches 42 extending in the axial direction may be provided in parallel in the circumferential direction in the built-up portions 22 and 23.

  In the present embodiment, the joint body 12 and the inner cylinder 13 are separate members, but the inner cylinder may be provided integrally with the joint body or may be integrated by insert molding. . Further, the inner cylinder is inserted into the joint main body and is fixed in position by the outer cylinder fitted into the joint main body, but may be directly fixed to the joint main body with, for example, a screw or a C ring. .

  In the present embodiment, the joint body and the inner cylinder are made of resin, but each may be made of metal, and both members may be made of metal. Moreover, the product made of metal and resin may be combined, and it may be made of metal and integrally formed. In this case, the insertion force reducing process may be formed at the time of molding if it is a mold-molded product, or may be provided by shot blasting or chemical treatment after the cutting process.

  -In this embodiment, although the concave grooves 19 and 20 in which the elastic seal ring 21 is arrange | positioned shall be provided in two places, embodiment of this invention is not restricted to this. For example, three or more concave grooves may be provided, and if at least one concave groove is provided, the water stop effect is exhibited.

  DESCRIPTION OF SYMBOLS 10 ... Joint, 11 ... Resin piping, 12 ... Joint main body, 13 ... Inner cylinder, 19 ... Concave groove, 20 ... Concave groove, 21 ... Elastic seal ring, 22 ... Front build-up part, 23 ... Rear part Overlaying part, 40 ... uneven surface.

Claims (5)

It has a substantially cylindrical shape and is provided with a joint body into which a resin pipe is inserted and a concave groove, and an elastic seal ring for stopping water in contact with the inner peripheral surface of the resin pipe is fitted in the concave groove. An inner cylinder body to be worn, and a joint provided with a built-up portion for preventing the elastic seal ring from protruding in front and rear positions of the concave groove of the inner cylinder body, The joint is characterized in that an insertion force reduction processed part is formed on the outer peripheral surface of the part. The said insertion force reduction process part is processed with respect to the build-up part provided in the front side of the ditch | groove among the build-up parts provided in the front-back position of a ditch | groove. Fitting described. The joint according to claim 1, wherein the insertion force reduction processed portion is a concavo-convex treatment. The joint according to any one of claims 1 to 3, wherein grease is applied to the insertion force reduction processing portion. The said insertion force reduction process part is a coupling of any one of Claims 1-4 formed with inner cylinder shaping | molding.

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