JPH0426775Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pipe joint. For more details,
In particular, it relates to a synthetic resin piping joint used when replacing a polyvinyl chloride water supply pipe without interrupting the water supply.

[Prior Art] Piping joints made of metal such as brass are used in conventional water piping.

The male fitting part of the male side member of such a piping joint and the inner peripheral surface of the end of the female side member are cylindrical surfaces that fit together with play, and the watertightness between them is determined by the end face of the female side member and the inner peripheral surface of the end of the female side member. It is held by tightening the packing interposed between the flange of the side member and the cap nut and the outer circumferential screw of the female side member.

Furthermore, metal joints are known that each have tapered surfaces that allow male and female members to fit into each other. An annular groove or a protrusion is formed on one of the tapered surfaces in order to exhibit sealing performance by making line contact on the tapered surfaces.

On the other hand, as devices for replacing pipes without interrupting the water supply, a stand piece and a Y-shaped piping joint are known.

[Problems to be solved by the invention] Since the conventional pipe joints described above cannot achieve watertightness or bonding strength unless the cap nut is sufficiently tightened, pipe replacement must be performed against the pressure of flowing water while water is being supplied. It cannot be used in cases where quick joining is required, such as during work.

Furthermore, when the diameter of the piping joint is large, the piping joint in the Y-shape is not straight, which limits its range of use.

The present invention was developed to solve this problem, and it is based on the premise that piping can be done in a straight line and the two are fixed with adhesive, and the piping creates watertightness and bonding strength that can withstand high water pressure at the same time as joining. The purpose is to provide fittings.

[Means for Solving the Problems] The synthetic resin piping joint of the present invention includes a pipe-shaped main body having a flange and a male fitting part with a tapered outer circumferential surface, and an outer periphery of the main body. a male side member consisting of a cap nut that is fitted into the cap nut and engaged with the flange, and an outer circumferential screw that is screwed into the cap nut, the inner circumferential surface of which is bonded to the outer circumferential surface of the male fitting portion. and a pipe-shaped female member formed in a tapered shape so as to fit tightly through a material. It is characterized by the formation of grooves.

[Operation and effects of the invention] Since the male side member and the female side member of the piping joint of the present invention are fitted with their tapered surfaces, they can be quickly fitted together after applying the adhesive. Moreover, strong watertightness and fitting strength can be immediately achieved due to the synergistic effect of the elasticity of the synthetic resins and the tapered surfaces.

Furthermore, since a plurality of annular grooves are formed on both tapered mating surfaces, the contact pressure based on the elasticity between the tapered surfaces is further increased, and after the adhesive has solidified, a foothold is formed, so to speak. This has the advantage of further improving the adhesion strength.

Furthermore, when the two are elastically connected, the stepped portions of the annular groove mesh with each other, creating a so-called ratchet, which increases the strength in the pulling direction, providing sufficient sealing and bonding even against high-pressure water. It has the advantage of being strong.

Furthermore, when the cap nut is tightened after fitting, the toothing of the annular groove may shift by one or two positions, thereby ensuring long-term sealing performance and bonding strength.

[Example] Next, the piping joint of the present invention will be explained with reference to the drawings.

Fig. 1 is a perspective view showing an embodiment of the piping joint of the present invention, Fig. 2 is a sectional view showing the coupled state of the piping joint shown in Fig. 1, and Fig. 3 is a main part of the piping joint shown in Fig. 1. FIG. 4 is a sectional view showing another embodiment of the piping joint of the present invention.

As shown in FIG. 1, the piping joint of the present invention is composed of a male side member 3 consisting of a pipe-shaped main body part 1 and a cap nut 2 inserted around the main body part 1, and a female side member 4, which is also pipe-shaped. be done.

In the main body portion 1, the cap nut 2 and the female side member 4 are each molded from a synthetic resin, such as polyvinyl chloride, which is the same as the resin pipe used for piping.

Near one end of the main body 1 are a flange 5 and a flange 5.
A male fitting portion 6 is further provided that extends concentrically from the male fitting portion 6 . As shown in FIG. 4, the outer peripheral surface of the male fitting portion 6 has a taper angle (θ) similar to a Morse taper.
A tapered surface 6a is formed. The tapered surface 6a is provided with about 3 to 10 annular grooves 6b, each having a trapezoidal cross section, for example (see FIG. 3).

The other end side 7 of the main body 1 is connected to a plumbing pipe (1 in Fig. 2).
2) is the part to be bonded, around which the cap nut 2 is fitted. The cap nut 2 has a stepped portion (8 in FIG. 2) that connects to the collar portion 5.

On the outer circumferential surface near one end of the female side member 4, there is an outer circumferential screw 9 that screws into the inner circumferential screw of the cap nut 2, and a hexagonal part 1 for applying a wrench when attaching or removing the cap nut 2.
0 is formed, and the inner circumferential surface 11 is formed in a tapered shape to tightly fit with the tapered surface 6a of the male fitting portion 6. Note that this inner circumferential surface 11 is also provided with about 3 to 10 annular grooves 6b, as shown in FIG.

The pipe joint constructed as described above is connected, for example, as follows. First, the pipe being supplied with water is cut and the upstream side is sealed off with a stopper or the like, and then the male member 3 and the female member 4 are fixed with adhesive or the like to the ends of the two pipes 12 (the upstream pipe and the replaced downstream pipe) to be connected. Next, the stopper is removed and at the same time, the male fitting portion 6, whose tapered surface 6a has been previously coated with adhesive (A in Fig. 3), is fitted into the tapered inner peripheral surface 11 of the female member 4. Furthermore, the cap nut 2 is firmly screwed into the outer peripheral thread 9 of the female member 4 to maintain the tapered surfaces pressed against each other (see Fig. 2).
The adhesive A may also be applied to the inner peripheral surface 11 of the female side member 4.

Since the adhesive enters into the annular groove 6b when it is applied, it melts the fitting surface after joining and becomes a foothold when solidified, further improving the adhesive strength. Therefore, the male side member 3 and the female side member 4
The sealing performance of the tapered part is sufficiently maintained, and the connection between the two is achieved by using the adhesive in the tapered part and the cap nut 2.
The screw fastening force is sufficiently high.

Further, since the annular grooves 6b of the male side member 3 and the female side member 4 mesh with each other, the sealing performance and the bonding strength are further improved. When the cap nut 2 is then tightened, the meshing annular grooves 6b are shifted by one or two positions, further maintaining high sealing performance.

In FIGS. 1 and 2, a straight male member 3 and a straight female member 4 are shown, respectively.
The present invention can of course be applied to elbow type, cheese type, etc. joints.

The cap nut 2 and the outer circumferential thread 9 may be either a pipe taper thread or a parallel thread, but usually the cap nut side is a parallel thread and the outer circumferential thread is a tapered thread.

The piping joint shown in FIG. 4 is almost the same as that shown in FIG. 1, but a seal P is interposed between the flange 5 and the distal end surface of the female member 4 to further improve watertightness.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the piping joint of the present invention, Fig. 2 is a sectional view showing the coupled state of the piping joint shown in Fig. 1, and Fig. 3 is a main part of the piping joint shown in Fig. 1. FIG. 4 is a sectional view showing another embodiment of the piping joint of the present invention. Main symbols in the drawings: 1... Main body, 2... Cap nut, 3... Male side member, 4... Female side member, 5...
...flange part, 6...male fitting part, 6a...tapered part,
6b...Annular groove, 11...Inner peripheral surface, A...Adhesive.

Claims (1)

[Claims for Utility Model Registration] A pipe-shaped main body having a flange and a male fitting part with a tapered outer peripheral surface, which is fitted onto the outer periphery of the main body and engaged with the flange. a male side member consisting of a cap nut, and an outer circumferential screw screwed into the cap nut,
a pipe-shaped female side member whose inner circumferential surface is formed in a tapered shape so as to closely fit with the outer circumferential surface of the male fitting part through an adhesive, and the outer circumferential surface of the male fitting part A synthetic resin piping joint in which a plurality of annular grooves are formed on both the inner peripheral surface of the female side member and the inner peripheral surface of the female side member.