JP2005188541A - Connection pipe and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection pipe for maintaining a stable connecting condition for a long period in connection between synthetic resin pipes or between the synthetic resin pipe and a metal pipe. <P>SOLUTION: The connection pipe for mutually connecting pipes inserted into an internal space of a cylinder body comprises a rubber cylindrical seal member fixed to the inner periphery wall face of the cylinder body in the state of being turned around with an opening portion of the connection pipe as a turn-around portion. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a connecting pipe for connecting pipes and a pipe and a method for constructing the connecting pipe.

Conventionally, in connecting pipes, adhesives cannot be used particularly in connection between polyethylene (PE) pipes, and various devices have been required. As an example, for example, the synthetic resin tubes to be connected are brought into contact with each other and brought into close contact with a heat-shrinkable tube, and further taped with tape or the like (see Patent Document 1).
Japanese Patent Laid-Open No. 11-325374

  However, it is difficult to maintain a stable connection state for a long time in connection of synthetic resin pipes such as polyethylene pipes, connection between synthetic resin pipes, or connection between a synthetic resin pipe and a metal pipe. There are challenges.

  The problem to be solved is that it is impossible to maintain a stable connection state for a long time in the connection of the synthetic resin tubes or in the connection between the synthetic resin tubes or between the synthetic resin tube and the metal tube.

  The gist for solving the above-mentioned problem of the connecting pipe according to the present invention is that, in the connecting pipe for connecting the pipe by inserting it into the inner space of the cylindrical body, the inner peripheral wall surface of the cylindrical body is made of a rubber cylindrical body. The side wall cross-sectional shape is a rectangular shape or a cylindrical sealing member having a shape having a stepped portion protruding outward is fixed.

  Furthermore, the gist for solving the above-mentioned problems of the connecting pipe according to the present invention is a connecting pipe for connecting a pipe by inserting it into the inner space of the cylindrical body, and a rubber cylindrical seal on the inner peripheral wall surface of the cylindrical body. The member is fixed in a state of being folded by providing a folded portion on the opening side of the connecting pipe.

The cylindrical sealing member is made of water-swelling rubber having a property of expanding with water;
Furthermore, the folded portion of the cylindrical seal member is housed in a concave groove provided on the inner peripheral wall surface of the connecting pipe and adhered with an adhesive;
The cylindrical seal member includes a pipe to be connected and fitted in an internal space of the connection pipe so as to be sealed.

  The gist of the construction method of the connecting pipe according to the present invention is that, after connecting the pipe to the connecting pipe according to the present invention, the heat-shrinkable tube is covered over the outside, and the heat-shrinkable tube is heated by the heating means. It is made to shrink and to seal a connection part.

  The connecting pipe of the present invention is provided with one or more cylindrical seal members in its internal space, and prevents leakage of liquid or gas. In addition, in the case where the folded portion is provided on the opening side of the connecting pipe and is fixed in a folded state, even if the liquid or gas leaks from the connected pipes, the leaked liquid or gas remains in the cylindrical seal. Is stored in the leakage prevention portion between the folded portion and the main body portion of the seal member, and is prevented from leaking outside.

  Further, as shown in FIG. 3, the more the liquid or gas is stored in the leakage prevention portion, the more the folded portion and the main body portion of the seal member are pushed in the radial direction, so that these are connected to the inner peripheral wall surface of the connection pipe and It is strongly pressed against the outer peripheral surface of the tube, and the airtightness or watertightness of the contact surface is further increased to exert a check valve effect, and leakage is reliably prevented.

  Moreover, by using a cylindrical seal member made of water-swollen rubber, it naturally expands and the air tightness or water tightness of the contact surface is increased.

  With the connection pipe construction method according to the present invention, reliable airtightness or watertightness can be maintained for a long period of time.

  The object of the connecting pipe according to the present invention is achieved by fixing one or more rubber cylindrical seal members to the inner peripheral wall surface of the connecting pipe. FIG. 1 is a sectional view of a connecting pipe 1 according to the present invention.

  The connecting pipe 1 connects pipes to each other in a combination of synthetic resin pipes to be connected or a synthetic resin pipe and a metal pipe, or connects a synthetic resin pipe to one side. .

  As shown in FIG. 1, the connecting pipe 1 is made of synthetic resin (mainly made of PE), and a rubber cylindrical sealing member 2 is formed on the inner peripheral wall surface 1b of the inner space of the cylindrical body 1a. The connecting tube 1 is fixed in a folded state with the opening 1c side of the connecting tube 1 turned back.

  On the inner peripheral wall surface 1b of the connecting pipe 1, a partitioning projection 1d is provided at a substantially central portion in the longitudinal direction, and a concave groove 1e is provided at a required position with the projection 1d being symmetrical. Yes. In order to form the concave groove 1e, for example, the cylindrical body 1a without a concave groove is integrally formed with a mold, and then the concave groove 1e is formed by cutting, or the cylindrical body 1a is formed in the axial direction. It is also possible to integrally divide the upper part and the lower part along the upper and lower parts together with a mold, and to provide an engaging part at the mating part so as to be integrally assembled.

  The depth of the concave groove 1 e is set to be substantially the same as the thickness of the folded portion 2 b of the cylindrical seal member 2. The width of the concave groove 1e is also substantially the same as or slightly longer than the width of the folded portion 2b. In this manner, the folded portion 2b is placed in the groove 1e.

  The concave groove 1e is not necessarily provided in the connection pipe 1. The cylindrical seal members 2 and 2 are inserted and positioned on the inner peripheral wall surface 1b without using a concave groove in the connection pipe 1. Then, it may be mounted and fixed in an opposing arrangement, or may be affixed.

  As shown in FIG. 2, the cylindrical seal member 2 is made of rubber (for example, synthetic rubber such as natural rubber, neoprene rubber, silicon rubber, isoprene rubber, styrene rubber), or in addition, by water It is a sealing member made of water-swelling rubber having the property of expanding.

  The cylindrical seal member 2 includes a main body portion 2c having an outer diameter substantially equal to the diameter of the inner peripheral wall surface 1b of the connection pipe 1, and a folded portion 2b obtained by folding a part of the main body portion 2c with the folded portion 2a. It becomes. A space between the main body 2c and the folded portion 2b serves as a leakage prevention portion 2d.

In order to fix one or more such cylindrical seal members 2 to the connecting pipe 1, as shown in FIG. 1 and FIG. 3, for example, an adhesive 3 is applied to the concave groove 1e, and the cylindrical seal member 2 is fixed. The folded portion 2a is set to the opening portion 1c side and is inserted into the internal space of the connecting pipe 1 so that the folded portion 2b is accommodated in the concave groove 1e. In addition, you may fix by other well-known fixing means, and also you may fix by only putting the folding | returning part 2b in the ditch | groove 1e, without using an adhesive agent.
In this manner, the folded portions 2b are placed in the concave grooves 1e on both sides, and the cylindrical seal members 2 and 2 are opposed to each other with the protruding portion 1d at the center portion interposed therebetween. Thus, the connecting pipe 1 shown in FIG. 1 is completed.

  When connecting the pipes 4 and 4 to be connected using the connecting pipe 1, a construction method that is a method of handling the connecting pipe 1 is to apply heat to one pipe 4 side in advance as shown in FIG. 4. The shrinkable tube 5 is inserted, and the pipes 4 and 4 are inserted into the connecting pipe 1 from both side openings 1c and attached.

  Thereafter, the heat-shrinkable tube 5 is moved so as to cover the connecting tube 1 and the tubes 4 and 4, and then heated by a heating device (dryer or the like), contracted and sealed. In this way, the connecting portions of the tubes 4 and 4 are reliably sealed by the connecting tube 1 and the heat shrinkable tube 5.

  As shown in FIGS. 3 and 4, when liquid or gas is sent to the tubes 4 and 4 and the liquid or gas leaked from the butted portion of the tubes is accumulated in the leakage preventing portion 2 d of the cylindrical seal member 2, The folded portion 2b and the main body 2c of the seal member are pushed and expanded in the radial direction. Therefore, these are strongly pressed against the inner peripheral wall surface 1b of the connecting pipe 1 and the outer peripheral face 4a of the connected pipe 4, and the airtightness or watertightness of the contact surface of the part is further increased.

  As shown in FIG. 5, as another embodiment of the connecting pipe 1, there is one cylindrical sealing member 6 made of rubber and having a stepped portion 6 a in which the side wall cross-sectional shape of the cylindrical body protrudes outward. This is an example of being fixed in an opposing arrangement. The step 6a is fixed by being fitted into the concave groove 1e, or fixed with an adhesive. Also according to this embodiment, the sealing performance can be maintained. In addition, the position of the step part 6a is preferably located on the opening 1c side or the center part of the connecting pipe 1. Furthermore, the case where the step 6a is not provided and the side wall cross-sectional shape of the cylindrical body is rectangular is also included in another embodiment. In this case, the concave groove 1e is not provided.

  As another modified example of the connecting pipe 1 according to the present invention, in each of the above-described embodiments, the cylindrical seal members 2 and 6 are provided in two locations in the inner space of the connecting pipe 1 so as to face each other. However, the present invention is not limited to this, and when the connecting portion on one side is integrated with an apparatus or the like or is connected with a sealing property secured, the cylindrical sealing member 2 is provided at one place in the connecting portion on the other side. Alternatively, the cylindrical seal member 6 is fixed.

It is sectional drawing of the connecting pipe 1 which concerns on this invention. It is a front view including a partial cross section of the cylindrical seal member 2 built in the connection pipe 1 of the same invention. 2 is a partially enlarged cross-sectional view of the connection pipe 1. FIG. It is explanatory drawing which shows the use condition of the connection pipe. It is sectional drawing which concerns on the other Example of the same connecting pipe.

Explanation of symbols

1 connecting pipe, 1a cylindrical body, 1b inner peripheral wall surface,
1c opening, 1d protrusion, 1e concave groove,
2 cylindrical sealing member, 2a folded portion, 2c folded portion,
3 Adhesive,
4 tubes,
5 heat shrink tube,
6 Cylindrical seal member, 6a Step.

Claims (6)

In the connecting pipe that connects the pipe by inserting it into the internal space of the cylinder,
A cylindrical seal member having a shape made of rubber and having a stepped portion with a side wall cross-sectional shape that is rectangular or protrudes outward is fixed to the inner peripheral wall surface of the cylindrical body,
Connection pipe characterized by. In the connecting pipe that connects the pipe by inserting it into the internal space of the cylinder,
A rubber cylindrical seal member is fixed to the inner peripheral wall surface of the cylindrical body in a state of being folded by providing a folded portion on the opening side of the connection pipe,
Connection pipe characterized by. The cylindrical sealing member is made of water-swollen rubber having the property of expanding with water,
The connecting pipe according to claim 1 or 2, wherein The folded part in the cylindrical seal member is placed in a concave groove provided on the inner peripheral wall surface of the connecting pipe and adhered with an adhesive,
The connecting pipe according to claim 2 or 3, wherein The cylindrical seal member is disposed opposite to the internal space of the connection pipe so that the pipe to be connected is inserted and sealed,
The connecting pipe according to claim 1, wherein: After connecting the pipe to the connecting pipe according to any one of claims 1 to 5, the heat-shrinkable tube is covered over the outside, and the heat-shrinkable tube is heated and contracted by heating means to seal the connecting portion. ,
A connecting pipe construction method that is characterized.

Images