JPH044388A - Connecting structure of coupling and pipe - Google Patents

Abstract

PURPOSE:To obtain a good processing efficiency and to give a secure anticorrosive treatment to the end of a pipe by fixing the pipe and a coupling with an adhesive filled between the end of the pipe inserted in the coupling and a coupling main body having projections on the inner surface. CONSTITUTION:A coupling 1 has a coupling main body 11 and a tube body 12 provided in the coupling main body 11. The tube body 12 has a tube part 13 with the bore smaller than the coupling main body 11, a fixing part 14, and a connecting part 15. On the outer surface of the tube part 13 of the tube body 12, a circular groove 16 is formed, where a packing such as an elastic silicon rubber or the like is installed. Between the inner surface of the coupling main body 11 and the outer surface of the tube part 13, an insertion part 17 to insert a pipe 2 is formed. The pipe 2 is covered by an adhesive 3 in the insertion part 17, and fixed to the coupling main body 11 with the adhesive 3. As a result, the pipe and the coupling can be connected in a good processing efficiency, and the cost can be also reduced. Furthermore, an anticorrosive treatment can be applied by sealing the end of the pipe with the adhesive.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a connection structure between a joint and a pipe in which a joint and a pipe are connected with an adhesive, and more specifically to a pipe such as a water supply pipe, a hot water supply pipe, or a drain pipe. This invention relates to a joint and pipe connection structure that can connect the ends of materials with good corrosion resistance.

(Prior Art) In recent years, composite pipes in which the inner peripheral surface of a metal pipe is coated with resin have been developed as piping materials such as water supply pipes and hot water supply pipes. When connecting such pipes using a joint, the connection structure shown in FIG. 7 is adopted because if the connection end of the pipe comes into contact with water, it may rust due to long-term use. 7th
The joint 20 shown in the figure is composed of a joint body 21 and a cylindrical body 22 disposed within the joint body 21. Cylindrical body 22
The cylindrical portion 23 and the joint body 21 have a smaller diameter than the joint body 21.
A fixed part 24 fixed to the inner surface of the fixed part 24 and the cylindrical part 2
The fixing part 24 is fixed to the inner surface of the axially central part of the joint body 21. A female threaded portion 26 is formed on the inner surface of both ends of the joint body 21,
Further, a male threaded portion 28 is formed on the outer surface of the insertion side end of the tube 2 . In order to connect a pair of pipes 2 using the joint 20 having such a configuration, an anti-corrosion sealant 29 is filled into the insertion portion 27 formed between the joint body 21 and the cylindrical portion 23. Then, the end of the tube 2 is inserted into the insertion portion 27 while being screwed together.

(Problems to be Solved by the Invention) In the above-mentioned connection structure, it is necessary to provide thread grooves on the inner surface of the joint body 21 and the outer surface of the end of the pipe 2, so the workability is reduced due to the thread cutting operation 9. However, there is also the disadvantage that preparation for thread cutting, management of standard thread cutting, etc. are troublesome and costs are high.

Furthermore, if the length of the male threaded portion 28 provided on the tube 2 is short, the end surface of the tube 2 may not come into contact with the sealant 29, resulting in insufficient corrosion protection of the end of the tube 2. On the other hand, if the length of the male threaded part 28 of the pipe 2 is long, the sealant 29 will be pushed inward from between the inner surface of the pipe 2 and the cylindrical part 23, and the sealant 29 will be applied to the faucet fittings, etc. There was a risk of it becoming clogged. Furthermore, in the case of a tube 2 in which the length of the male threaded portion 28 is long, the tip of the tube 2 strongly presses the connecting portion 25 of the cylindrical body 22.
There was also a risk that the connecting portion 25 would be damaged.

The present invention is intended to solve the above-mentioned drawbacks, and its purpose is to provide a joint-pipe connection structure that eliminates the need to provide thread grooves on the joints and pipes, and is therefore easy to construct and can reduce costs. Our goal is to provide the following. Still another object of the present invention is to provide a joint-pipe connection structure in which the end of the pipe can be reliably subjected to anti-corrosion treatment.

(Means for Solving the Problems) The joint-pipe connection structure of the present invention is a joint-pipe connection structure in which a protrusion is provided on the inner surface of the joint body and a pipe insertion portion is formed at the end of the joint body. The connection structure is such that the reading tube and the fitting are fixed with adhesive filled between the end of the reading tube inserted into the insertion part of the fitting and the fitting body, thereby achieving the above purpose. achieved.

(Function) When the inner surface of the joint body is filled with adhesive and the end of the pipe is inserted into the joint from the end side of the joint body, the adhesive will be mixed between the inner surface of the joint body, the protrusion, and the end of the pipe. The adhesive cures while being filled between the joint and the pipe. Therefore, the joint and the pipe can be connected without providing a thread groove on the inner surface of the joint body or the end of the pipe, and at the same time, the end of the pipe can be anti-corrosion treated with the adhesive.

(Example) The present invention will be explained in detail below based on examples.

As shown in FIG. 1, the joint 1 includes a joint main body 11 and a cylindrical body 12 disposed concentrically within the joint main body 11. As shown in FIG. The cylindrical body 12 has a cylindrical part 13 having a smaller diameter than the joint body 11, a fixed part 14 fixed to the inner surface of the joint main body 11, and a connecting part 15 connecting the fixed part 14 and the cylindrical part 13, The fixed portion 14 is fixed to the inner surface of the axially central portion of the joint body 11 . The joint body 11 is made of metal or a synthetic resin material, and the cylindrical body 12 is made of, for example, a synthetic resin material with excellent corrosion resistance. An annular groove 1 is formed on the outer surface of the cylindrical portion 13 of the cylindrical body 12.
6 is formed, and a gasket 4 made of elastic silicone rubber or the like is mounted in the groove 16. An insertion portion 17 that is open on the outside is formed between the inner surface of the joint body 11 and the outer surface of the cylindrical portion 13, and the interval between the insertion portions 17 is set to be equal to or larger than the wall thickness of the tube 2. Further, a taper lla is formed on the inner surface of the joint body 11 so that the wall thickness becomes gradually thinner toward the end portion, and the gap size of the insertion portion 17 is formed so as to gradually increase toward the outside.

The tube 2 used in the present invention has a resin layer 2 on the inner surface of the metal tube 2a.
b, and the end portion thereof is not provided with a male screw portion.

-4= The inner diameter of the tube 2 is set to be slightly larger than the outer diameter of the cylindrical portion 13 of the cylindrical body 12 described above, and set to be the same size or slightly smaller than the outer diameter of the packing 4. Adhesive 3 used in the present invention
Various known adhesives can be used, and adhesives that have anticorrosion effects and good adhesion to metals are particularly preferred. Examples of such adhesives include epoxy adhesives.

In order to connect the pipe 2 using the above-mentioned joint 1, as shown in FIG. Insert inside.

The inner surface of the tube 2 slides into the outer surface of the packing 4 while inserting the insertion portion 1.
7 will be inserted.

As the tube 2 is inserted, the adhesive 3 filled in the insertion part 17 is pushed out from between the outer surface of the tube 2 and the inner surface of the joint body 11, and the end of the tube 2 is covered with the adhesive 3. , the pipe 2 and the joint body 11 are fixed with adhesive 3. Fitting 1
If another tube is connected into the other insertion portion 17 in the same manner as described above, the pair of tubes will be connected via the joint 1. Also, the second
As shown in the figure, there is a threaded ventilation hole 9 in the socket of the fitting 1.
After filling the insertion portion 17 with a sealing material 19 made of silicone resin or the like, the tube 2 is inserted, and the screw 10 is screwed into the vent hole 9 to tighten and fix the tube 2. This prevents the pipe 2 from being pulled out and allows the sealing material 19 to solidify stably.

According to such a configuration, the fitting 1 and the pipe 2 can be firmly connected with good sealing performance without using a pipe with a male threaded portion at the end, and moreover, it is possible to firmly connect the fitting 1 and the pipe 2 with good sealing performance, and the size of the male threaded portion does not require the use of a pipe having a male threaded portion at the end. No problems occur when connecting pipes. Therefore, the wall thickness of the connecting portion 15 of the joint 2 can be made thin, and the cost thereof can also be reduced. In addition, in order to connect the pipe 2 and the fitting 1, it is only necessary to fill the insertion part 17 of the fitting 1 with the adhesive 3 and insert the pipe 2 into the insertion part 17. There is no need for thread cutting or screwing, which greatly simplifies construction work. Further, by screwing a screw into the threaded vent hole 9 provided in the socket portion of the joint 1 and fixing the inserted pipe 2, it is possible to prevent the pipe 2 from being pulled out and to stably solidify the sealing material 19.

Another embodiment of the invention is shown in FIG.

In this embodiment, the joint 1 is constructed by integrally providing an annular protrusion 18 on the inner surface of the axially central portion of the joint body 11. A taper lla is formed on the inner surface of the joint body 11 so that the thickness of the joint body 11 gradually decreases toward the end. Further, a seal member 19 made of silicone rubber or the like is provided on the side surface of the protrusion 18 to prevent the adhesive 3 filled in the joint body 11 from spilling out inside the pipe 2 when the pipe 2 is connected. There is.

In this example, to connect fitting 1 and pipe 2,
The inner surface of the joint body 11 is filled with adhesive 3, and then the end of the pipe 2 is inserted into the pipe joint body 11. As the tube 2 is inserted, the adhesive 3 is pressed against the end of the tube 2 and is filled between the outer surface of the end of the tube 2 and the inner surface of the joint body 11 and hardens, thereby fixing the tube 2 and the joint 1.

In this embodiment, one sealing member is provided on the side surface of the protrusion 18, so that the end surface of the tube 2 is protected by this sealing member.
By pressing the pipe 2 into the joint body 11 without making it contact with the pipe 9, the pipe 2 and the joint body 11 can be fixed together with the adhesive 3 without the adhesive 3 leaking into the pipe 2.

FIG. 4 shows yet another embodiment of the invention.

In this embodiment, the joint 1 is constructed by providing a joint main body 11 having substantially the same structure as the second embodiment described above with a ventilation hole 9 through which the inside and outside of the joint main body 11 communicate with each other.

In this embodiment, when inserting the pipe 2 into the joint body 11, part of the air and adhesive 3 existing between the pipe 2 and the pipe joint body 11 can escape to the outside through the ventilation hole 9. Therefore, it is possible to prevent the adhesive 3 from leaking into the inside of the tube 2 when the tube 2 is inserted. Furthermore, there is no need to provide a taper on the inner surface of the joint body 11.

Further, FIG. 5 shows still another embodiment of the present invention. In this embodiment, screws are provided in the ventilation holes 9 attached to the outer peripheral surfaces of both sides of the joint body 11, and after inserting the pipe 2,
This is a method in which a screw 9a is screwed into a threaded vent hole 9 and the adhesive 3 is solidified.

Further, FIG. 6 shows still another embodiment of the present invention. In this embodiment, the receiver of the main body of the joint 1 has a concave groove formed on its outer periphery, and a split type cap nut 15 is fitted into the concave groove. A locking blade 31 for locking the outer circumferential surface of the pipe 2 is provided on the end side of the joint 1 of the cap nut 15, and a tightening bolt provided on the outer circumference of the cap nut 15 is screwed into the bolt. A nut 15 is fitted and fixed on the outer circumferential surface of the tube 1 to stably solidify the adhesive 3. It should be noted that the cap nut 15 may have a structure in which the entire cap nut 15 has a C-shaped shape, and the outer peripheral portion of the cap nut 15 is tightened and fixed by a band.

In each of the above embodiments, a metal tube with a resin layer provided on the inner surface is used as the tube 2, but a metal tube or a synthetic resin tube can also be used.

(Effects of the Invention) According to the present invention, there is no need to provide thread grooves on the joint or the pipe, so the pipe and the joint can be connected with good workability, and costs can be reduced. Furthermore, the ends of the tube can be sealed with adhesive to provide reliable corrosion protection.

[Brief explanation of the drawing]

Fig. 1 is a partially broken pressure surface view showing one embodiment of the joint and pipe connection structure of the present invention, Fig. 2 is a sectional view of the main part of another embodiment of the present invention, Figs. 3 and 4. , FIG. 5 and FIG. 6 are sectional views of essential parts of still other embodiments of the present invention, and FIG. 7 is a partially cutaway front view of a conventional example. 1...Joint, 2...Pipe, 3...Adhesive, 4...
Packing, 11... Joint body, 12... Cylindrical body, 13
... Cylindrical part, 14... Fixed part, 15 Connecting part, 16...
- Insertion part, 18... protrusion. that's all

Claims (1)

[Claims] 1. A joint and pipe connection structure in which a protrusion is provided on the inner surface of the joint body and a pipe insertion part is formed at the end of the joint body, and the pipe is inserted into the insertion part of the joint. A joint-pipe connection structure in which the pipe and the joint are fixed with an adhesive filled between the end portion and the joint body.