JP2002156086A - Joint for branching - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint for branching capable of securely connecting pipes and performing branched pipe construction simply and easily even when a metallic branched pipe is branched and taken out from a plastic original pipe to perform piping construction. SOLUTION: This joint for branching consists of a plastic joint main body 10 having a branched pipe part 13 and a metallic tubular adapter 20 sealed and connected to the branched pipe part 13 of the joint main body rotatably and having a connection end part with piping. A male screw 16 is provided on a cylindrical inner face 14 and an outer face in an end part of the branched pipe part 13, and a cap nut 27 sealed and mounted on the cylindrical inner face 14 of the branched pipe part by mounting a packing 25 on a tubular outer face of the adapter 20 and locked on the tubular outer face is screw-fitted in the male screw 16 to seal and connect the joint main body 10 and the metallic adapter 20 mutually.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of connecting a plastic main pipe for transporting a fluid, providing a branch pipe from the main pipe, and blocking a repair portion of the main pipe when repairing the main pipe. Also, the present invention relates to a joint for branching in which a branch pipe is provided to continue fluid transport and used as a bypass pipe of a main pipe repair section.

[0002]

2. Description of the Related Art Conventionally, there are various branch joints made of metal for a metal main pipe, such as Japanese Patent Application Laid-Open No. 7-63294. This is mechanically fastened to the main pipe with bolts and nuts, and when connected to a plastic main pipe, the main pipe is deformed and the sealing property is reduced, causing problems such as gas leakage. Accordingly, a large number of plastic electric fusion-type saddle joints in which a heating wire for fusion to the outer peripheral surface of a plastic main pipe is embedded in the inner surface of the saddle are disclosed. When connecting a plastic pipe to the branch pipe section of this plastic saddle joint, since the joint body and the plastic pipe are made of the same plastic, screw fastening and electric fusion using an electric fusion joint can be performed with each other, thus ensuring safety. Can be connected to However, for example, in the case of repairing a damaged portion of a plastic main pipe, a metal pipe or a metal joint is temporarily provided in the branch pipe section of the plastic joint main body in order to cut off the main pipe and install a bypass pipe. In some cases, the external thread of the metal pipe or the metal joint is screwed and connected to the female pipe thread.

[0003]

When a metal male screw is screwed into a female screw of a plastic joint body as described above, the strength of the metal male screw is much larger than that of a plastic female screw. There is a problem that the internal thread made of plastic is damaged by the torque and connection cannot be performed, or leakage occurs from the threaded connection portion, so that reliable connection cannot be performed. Therefore, a metal ring engraved with a female screw is cast into the main body at the screw connection part with the branch pipe provided on the plastic joint body, and it is integrally molded, or a metal ring with a female thread is sealed and locked. Some are fitted to the joint body via a mechanism. However, the tightening torque for screwing a male external thread such as a metal pipe is extremely large, and the cast-in or fitting connection between the plastic joint body and the metal ring engraved with the female thread is broken,
There is a problem that leakage occurs from the fitting portion or that the screw connection can be performed only in an insufficiently tightened state. The present invention solves the above problems, and provides a joint for branching in which a reliable connection can be made and branch pipe construction can be performed easily and easily even when branch branch pipes made of metal are branched out from a plastic main pipe. .

[0004]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a joint body made of a plastic having a branch pipe portion, and a cylindrical connecting portion rotatably hermetically connected to the branch pipe portion of the main body. It is a joint for branching, comprising a metal adapter. Also, a plastic joint body comprising a saddle portion fused to a side portion of the main pipe and a branch pipe portion erected from the upper surface of the saddle portion, and a cylinder rotatably hermetically connected to the branch pipe portion of the joint body. And a metal adapter having a connection end with the pipe in a shape of a metal. In the above, a thread is provided on the inner surface and the outer surface of the cylinder at the end of the branch pipe portion, packing is mounted on the cylindrical outer surface of the adapter, and the sealing is mounted on the inner surface of the cylinder of the branch pipe portion,
A branch joint characterized in that a cap nut latched to a cylindrical outer surface is screwed into an external thread of the branch pipe portion, and the saddle body and a metal adapter are hermetically connected. In the above, there is provided a joint for branching, wherein two protrusions are provided on the cylindrical outer surface of the adapter, and the cap nut is locked between the two protrusions. In the above, the joint main body is connected to the main pipe by electric fusion.

[0005]

According to the present invention, a metal adapter having a pipe connection end is rotatably and hermetically connected to a plastic joint body. For this reason, the connection screw of the metal pipe or the metal joint is screw-connected to the connection internal thread or the external thread provided on the metal adapter, and branch piping is performed. Since the adapter is made of metal, the metal screw of this adapter is screwed to the metal screw of the pipe or fitting, so this screw connection is a screw connection between the same metal male screw and female screw, and the A secure, secure and secure screw-fastened connection without any problems can be made. In addition, this adapter is rotatably and sealedly connected to the plastic joint body, so workability is good when screwing a metal pipe or metal joint to this adapter, and it is easy to install after branch piping. Flexible and good workability.

[0006] At the connection between the joint body and the screw adapter, a cap nut engaged with the screw adapter is fastened to the male screw of the saddle body, so that the joint body and the screw adapter can be easily assembled and separated. . For this reason, after the use of the branch take-out pipe is completed, for example, after removing the bypass pipe, the branch pipe part of the joint body can be easily removed, and a cap is screwed in place of the cap nut to easily make the branch pipe part. It can be closed, is easy to take out again, and has good pipe workability. Also, since two protrusions are provided on the outer cylindrical surface of the adapter, and the cap nut is locked between the two protrusions, the cap nut can be securely fixed to the joint body by tightening the cap nut, and the cap nut can be loosened. Thus, since the adapter is locked to the cap nut, the adapter is also detached from the joint body with the cap nut, and the adapter can be easily removed from the joint body. Also, the joint body is reliably fused to the main pipe by being connected to the main pipe by electric fusion.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIGS. 1 to 4 show a branch joint according to an embodiment of the present invention, which is a branch saddle joint. In FIG. 1, a saddle joint body 10 is made of a thermoplastic resin such as polyethylene, and a heating wire 1 is provided on an inner surface of a saddle portion 11.
2 is buried and straddles the outer surface of the plastic main tube and is fused to the outer surface of the main tube. A branch pipe portion 13 protrudes from the center of the outer surface of the saddle portion 11, and the inner surface of the branch pipe portion 13 forms a cylindrical inner surface 14 and a female screw 15 for a pipe in order from the end, and a male screw 16 is formed on the outer surface of the branch pipe portion 13. Is formed.

Reference numeral 20 denotes a steel adapter. One end is provided with a pipe internal thread 21 for connecting a branch take-out pipe, and the other end is a cylindrical portion 22 connected to the saddle joint body 10. The outer periphery of the cylindrical portion 22 is, in order from the tip, a guide cylindrical portion 23 having an outer diameter smaller than the inner diameter of the female pipe thread 15, a cylindrical outer surface 24 mounted on the cylindrical inner surface 14 of the branch pipe portion 13, and a rubber packing 25 mounted on the cylindrical outer surface 24. A C-shaped retaining ring 26 fitted with a retaining groove provided in the cylindrical outer surface 24, a resin cap nut 27 to be retained on the C-shaped retaining ring 26, and a margin at a position wider than the width of the jaw 28 of the cap nut 27. The C-shaped retaining ring 29 is fitted with a locking groove at a position having a. Further, an outer peripheral surface 30 through which the cap nut 27 can be inserted is provided above the C-shaped retaining ring 29.

2 to 4 show a procedure for locking the cap nut 27 to the adapter 20. First, as shown in FIG.
0 is prepared, and a C-shaped retaining ring 29 is mounted from the tip and moved to the upper back. Next, as shown in FIG. 3, the cap nut 27 is attached and the adapter 20 is moved to the top and bottom. In this state, the rubber packing 25 is attached to the annular groove on the outer surface of the adapter 20, and the C-shaped retaining ring 26 is further fitted. C-type retaining ring 26
Is an outer diameter for engaging with the jaw 28 of the cap nut 27.
Next, as shown in FIG. 4, the cap nut 27 is lowered to fit the C-shaped retaining ring 29 into the annular groove of the adapter 20.

Then, the cap nut 27 is attached to the screw adapter 20.
Is locked, the screw adapter 20 is mounted on the inner surface of the branch pipe portion 13 of the saddle body, and the cap nut 27 is screwed into the male screw 16 on the outer surface of the branch pipe. As described above, the saddle body 10 and the metal adapter 20 are hermetically connected by the packing 25. Until the cap nut 27 is completely tightened and fixed, the adapter 20 is rotatable with respect to the saddle main body 10, and the workability is improved even when connecting a metal branch pipe to the pipe connection female screw 21 of the adapter 20. Good.

For example, when the use of the branch pipe connected to the metal adapter 20 is completed, for example, when the necessity of the bypass pipe is completed, it is necessary to remove the bypass pipe. When the cap nut 27 is loosened, the cap nut jaw 28 is engaged with the C-shaped snap ring 29 of the adapter, the adapter 20 is pulled up, and both are removed from the branch pipe portion 13. Thereafter, a resin screw plug can be screwed into the female pipe thread 15 provided on the inner surface of the saddle main body branch pipe portion 13 to close it, or a plug with a packing is inserted into the cylindrical inner surface 14 provided on the inner surface of the branch pipe portion 13. And can be closed.
Another closing cap is screwed into the male screw 16 on the outer surface in place of the cap nut 27, and the double screw is completely closed so as not to leak from the branch pipe portion 13.

[0012]

As described in detail above, the branch joint according to the present invention is safe and free from leakage with a metal branch pipe even when branching out a metal branch pipe from a plastic main pipe. The connection can be reliably and firmly made, and the piping of the branch pipe and the closing of the branch pipe after the removal of the branch pipe can be easily and reliably performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a branch saddle joint according to an embodiment of the present invention.

FIG. 2 is a view showing a screw adapter 20 according to one embodiment of the present invention.

FIG. 3 shows a screw adapter 20 according to an embodiment of the present invention.
FIG. 7 is a view showing a state in which a cap nut 27, a rubber packing 25, and a C-shaped retaining ring 26 are mounted.

4 is a view showing a state in which the cap nut 27 is lowered from the state of FIG. 3 and a C-shaped retaining ring 29 is mounted.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Saddle body 11 Saddle part 12 Heating wire 13 Branch pipe part 14 Cylindrical inner surface 15 Female screw for pipe 16 Male screw 20 Screw adapter 21 Female screw for branch pipe connection 22 Cylindrical part 23 Guide outer surface 24 Cylindrical outer surface 25 Rubber packing 26, 29
C-type snap ring 27 Cap nut 28 Cap nut jaw 30 Cap nut insertion outer surface

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeru Mizutani 2nd Daifuku, Kuwana-shi, Mie, Hitachi Metals, Ltd. Kuwana Plant (72) Inventor Koji Kato 2nd Daifuku, Kuwana-shi, Mie, Hitachi Metals, Kuwana Plant F Terms (reference) 3H019 BA04 BB02 BD05 GA03 GA12

Claims (5)

[Claims] 1. A plastic joint body having a branch pipe portion, and a cylindrical metal adapter having a connection portion with a pipe which is rotatably and sealingly connected to the branch pipe portion of the main body. A joint for branching characterized by the following. 2. A plastic joint body comprising a saddle portion connected to a side portion of a main pipe and a branch pipe portion erected from the upper surface of the saddle portion, and rotatably hermetically connected to the branch pipe portion of the joint body. And a metal adapter having a cylindrical connection end with a pipe. 3. A thread is provided on an inner surface and an outer surface of a cylinder at an end of the branch pipe, a packing is mounted on a cylindrical outer surface of the adapter, and the adapter is hermetically mounted on a cylindrical inner surface of the branch pipe. The branch joint according to claim 1 or 2, wherein the cap nut engaged with the male member is screwed to the external thread of the branch pipe portion, and the saddle body and the metal adapter are hermetically connected. 4. The joint according to claim 1, wherein two protrusions are provided on the cylindrical outer surface of the adapter, and the cap nut is locked between the two protrusions. 5. The branch joint according to claim 1, wherein the joint body is connected to the main pipe by electric fusion.