JPH0628467U - Different pipe connection structure - Google Patents

Abstract

(57) [Summary] [Purpose] The synthetic resin pipe 10 is not damaged even when a traction force is applied, and has excellent sealing properties. [Structure] A flange portion 11 is provided on a synthetic resin pipe 10, a fitting portion 26 of a joint sleeve 20 is fitted on the flange portion 11, and a bolt member 40 and a screw fitted on the synthetic resin pipe 10 are screwed. Be combined. Between the joint sleeve 20 facing the end surface of the synthetic resin pipe 10 and the end surface of the flange portion 11, O-rings 12 and 13 are provided.
The O-rings 12 and 13 are pressed against the end face of the flange portion 11 and the connecting portion 23 of the joint sleeve 20 by the rotation of the bolt member 40. The metal tube 30 is screwed to the tip of the cylindrical joint body 21 extending from the connecting portion 23.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a connection structure of different types of pipes used for connecting a synthetic resin pipe and a pipe made of a material different from the synthetic resin pipe, such as a synthetic resin pipe and a metal pipe.

[0002]

[Prior art]

 It has been conventionally known to use a metal mechanical joint to connect a metal tube having excellent rigidity to a synthetic resin tube made of polyethylene or the like, which has poor adhesion. For example, in Japanese Unexamined Patent Publication No. 4-131583, a metal lock ring provided inside a joint body screwed to an end of a metal pipe is locked to a synthetic resin pipe, and the metal pipe and the synthetic resin pipe are A joint structure for connecting and has been proposed. However, in such a mechanical joint, the synthetic resin pipe and the joint body are prevented from coming off by locking the metal lock ring provided in the synthetic resin pipe to the outer peripheral surface of the synthetic resin pipe. Therefore, when a traction force is applied to the synthetic resin pipe, the synthetic resin pipe portion where the lock ring is locked may be damaged.

For such a mechanical joint, Japanese Utility Model Laid-Open No. 2-6898, Japanese Utility Model Laid-Open No. 4-125384, Japanese Utility Model Laid-Open No. 4-125385, etc. have a metal portion connected to a metal pipe, A joint having a synthetic resin portion connected to a synthetic resin pipe is disclosed. In the joints disclosed in these publications, a synthetic resin pipe and a synthetic resin portion of the joint are fused. Then, a metal pipe is inserted between the metal part of the joint and the synthetic resin part by a ring-shaped seal member or between the metal pipe and the ring-shaped seal member provided in the metal part of the joint. When fitted, it seals between the metal pipe and the synthetic resin pipe.

[0004]

[Problems to be solved by the device]

 In such a joint, the ring-shaped sealing member such as the O-ring is fitted in the metal part or the synthetic resin part of the joint, or in the metal pipe, so that the long-term use and the difference in the coefficient of thermal expansion are different. There is also a problem that the sealing performance is deteriorated due to the fluctuation of the diameter of the portion where the seal member is fitted due to the above.

The present invention solves such a problem, and an object thereof is to prevent a synthetic resin pipe from being damaged even when a traction force is applied thereto and to exhibit a stable sealing function for a long period of time. It is to provide a connecting structure for pipes.

[0006]

[Means for Solving the Problems]

 The heterogeneous pipe connection structure of the present invention has a flange portion provided at the end of a synthetic resin pipe having a flange portion at the end, and a shaft which is rotatable with respect to the synthetic resin pipe and abuts against the flange portion. Is fitted to the flange part so that the flange part of the synthetic resin pipe is located inside and the bolt member with the thread groove formed on the outer peripheral surface. A cylindrical fitting portion in which a threaded portion provided on a peripheral surface is screwed into a thread groove of the bolt member, a coupling portion coupled to the fitting portion so as to face an end surface of the flange portion, A joint sleeve having a cylindrical joint body extending from the connecting portion in a direction away from the fitting portion so that a pipe made of a material different from that of the synthetic resin pipe is fitted; A pair of a flange end face of a pipe and the end face at the joint of the joint sleeve. Is intended to include a, a ring-shaped seal member that seals over the entire circumference is pressed between the surfaces, by the above-described object is achieved.

[0007]

[Action]

 In the heterogeneous pipe connection structure of the present invention, the fitting part of the joint sleeve is fitted to the flange part of the synthetic resin pipe, and the screw part provided on the inner peripheral surface of the fitting part is fitted to the synthetic resin pipe. The joint sleeve is connected to the synthetic resin pipe by screwing into the thread groove of the bolt member. By rotating the bolt member and moving the entire joint sleeve, the seal member located between the flange end surface and the joint sleeve joint is pressed against both sides, and the seal member located between the flange member end face and the joint sleeve connecting portion is circumferentially surrounded. Seal it. Then, a pipe made of a material different from that of the synthetic resin pipe is connected to the joint main body of the joint sleeve.

[0008]

【Example】

 An embodiment of the present invention will be described below. As shown in FIG. 1, the connection structure of different types of pipes according to the present invention is used for connecting a synthetic resin pipe 10 and a metal pipe 30 used for a water pipe or a gas pipe, for example. One end of the synthetic resin pipe 10 is integrally provided with a flange portion 11 projecting outward over the entire circumference, and the synthetic resin pipe 10 has a cylindrical metal bolt. The member 40 is rotatably fitted and arranged so as to be adjacent to the flange portion 11. As shown in FIG. 2, the bolt member 40 is provided with a bolt main body portion 41 having a thread groove 41 a on the outer peripheral surface thereof, and one end portion of the bolt main body portion 41 so as to project outward. And a head portion 42, and the head portion 42 is fitted into the synthetic resin pipe 10 so that the head portion 42 is located on the far side of the flange portion 11 of the synthetic resin pipe 10. A metal joint sleeve 20 is fitted to the flange portion 11 of the synthetic resin pipe 10.

The joint sleeve 20 is connected to the cylindrical fitting portion 26 into which the flange portion 11 of the synthetic resin pipe 10 is inserted, and the fitting portion 26 along the end surface of the flange portion 11 of the synthetic resin pipe 11. And a cylindrical joint body portion 21 connected to the connecting portion 23 so as to extend in a direction away from the fitting portion 26.

A threaded portion 27 is provided on the inner peripheral surface of the distal end portion of the fitting portion 26 of the joint sleeve 20 opposite to the connecting portion 23 side, and the screw member 27 of the bolt member 40 fitted into the synthetic resin pipe 10 is provided. The bolt is screwed into a thread groove 41a provided on the outer peripheral surface of the body 41. A pair of ring grooves 24 and 25 are provided on the surface of the connecting portion 23 of the joint sleeve 20 that faces the end surface of the flange portion 11 of the synthetic resin pipe 10. Each ring groove 24 and 25 has a circular shape along a concentric circle with respect to the axis of the joint sleeve 20, and a part of the O-rings 12 and 13 is fitted in each ring groove 24 and 25.

The joint body 21 has an inner diameter similar to the inner diameter of the synthetic resin pipe 10, and a threaded portion 22 is formed on the outer peripheral surface of the tip of the joint body 21. The screw portion 22 is adapted to be screwed with a screw portion formed on the inner peripheral surface of the end portion of the metal tube 30.

As shown in FIG. 3, the flange portion 11 provided at the end of the synthetic resin pipe 10 has a cylinder of a predetermined length made of the same synthetic resin at the end of the synthetic resin pipe 10. It is formed by fitting the cylindrical sockets 15 and welding them by electrofusion bonding (EF bonding) or heat fusion (HF bonding). The axial length L and the wall thickness W of the socket 15 are set so that the predetermined shear strength can be obtained even when the synthetic resin pipe 10 is buried in the ground and a predetermined shear strength is obtained. It is set based on the inner diameter A. For example, a synthetic resin pipe with an inner diameter of 100 mm can obtain a shear strength of 2500 kg, an inner diameter of 150 mm can have a shear strength of 5000 kg, and an inner diameter of 200 can have a shear strength of 8,000 kg. The minimum axial dimension of the socket 15 is set as shown in Table 1 with respect to the inner diameter of the synthetic resin pipe.

[0013]

[Table 1]

In such a connection structure of different kinds of pipes, the bolt member 40 is fitted in the synthetic resin pipe 10 in advance, and the ring grooves 24 and 25 in the connecting portion 23 of the joint sleeve 20 are respectively O-shaped. With the rings 12 and 13 fitted together, the fitting portion 26 of the joint sleeve 20 is fitted into the flange portion 11 of the synthetic resin pipe 10. Then, the bolt member 40 is moved in the direction of the joint sleeve 20, the bolt main body 41 of the bolt member 40 is inserted into the fitting portion 26 of the joint sleeve 20, and the bolt member 40 is attached to the synthetic resin pipe. Rotate against 10. As a result, the screw groove 41a provided on the outer peripheral surface of the bolt main body 41 is screwed to the screw portion 27 provided on the inner peripheral surface of the fitting portion 26 of the joint sleeve 20, so that the joint sleeve 20 is attached to the bolt member 40. Connected to.

Thereafter, when the bolt member 40 is further rotated, the tip surface of the bolt main body portion 41 of the bolt member 40 is pressed against the flange portion 11 of the synthetic resin pipe 10, and in such a state, When the bolt member 40 is rotated, the entire joint sleeve 20 is pulled toward the bolt member 40 side. As a result, the O-rings 12 and 13 provided in the ring grooves 24 and 25 of the connecting portion 23 of the joint sleeve 20 are pressed against the end surface of the flange portion 11 of the synthetic resin pipe 10 to form the flange of the synthetic resin pipe 10. The part 11 and the connecting part 23 of the joint sleeve 20 are liquid-tightly sealed. In this way, when the joint sleeve 20 is connected to the synthetic resin pipe 10, the threaded portion 22 provided at the tip of the joint body 21 of the joint sleeve 20 is provided on the inner peripheral surface of the end of the metal pipe 30. The screw portion is screw-coupled, and the metal tube 30 is connected to the joint body portion 21. As a result, the synthetic resin pipe 10 and the metal pipe 30 are integrally connected.

When the synthetic resin pipe 10 and the metal pipe 30 are connected in this way, even if a traction force acts on the synthetic resin pipe 10 or the metal pipe 30, the traction force is pressed against the end surface of the flange portion 11. It is transmitted to the flange portion 11 by the held bolt member 40 and is received by the flange portion 11. As described above, since the flange portion 11 is formed integrally with the synthetic resin pipe 10 so as to obtain a predetermined shear strength, the flange portion 11 is not likely to be damaged.

The present invention is not limited to such an embodiment. For example, the tip of the joint body 21 of the joint sleeve 20 and the metal pipe 30 are not limited to being connected by a screw connection, but may be a metal pipe. When a rubber sleeve is bonded inside the end of the pipe, as shown in Fig. 4 (a), an annular projection 52 that projects outward is provided on the outer peripheral surface of the distal end of the joint body 21. A coupling sleeve 20 is used. In this case, when the metal tube is fitted to the joint body 21, the projection 52 is engaged with the rubber sleeve adhered to the inner peripheral surface of the metal tube to prevent the metal tube from coming off. When a flange is formed at the end of the metal pipe, as shown in Fig. 4 (b), the joint sleeve is provided with a flange 51 protruding outward at the tip of the joint body 21. Twenty is used. Then, the flange portion 51 and the flange portion provided on the metal pipe are connected by bolts and nuts.

[0018]

[Effect of device]

 In the connection structure of different types of pipes of the present invention, since the traction force applied to the synthetic resin pipe is received by the flange portion provided at the end of the synthetic resin pipe, there is no risk of the synthetic resin pipe being damaged. Also, the ring-shaped seal member seals the flange end face and the joint sleeve coupling part in a state of being pressed against each other, so that they can be stably maintained for a long period of time. Can be sealed.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an example of a connection structure of the present invention.

FIG. 2 is a sectional view of a bolt member used in the connection structure.

FIG. 3 is a partial vertical cross-sectional view showing a manufacturing process of a flange portion of a synthetic resin pipe used for the connection structure.

FIG. 4A is a sectional view showing another embodiment of a joint sleeve used for the connection structure, and FIG. 4B is a sectional view showing yet another embodiment of the joint sleeve.

[Explanation of symbols]

 10 Synthetic resin pipe 11 Flange portion 12 O-ring 13 O-ring 20 Joint sleeve 22 Threaded portion 27 Threaded portion 30 Metal tube 40 Bolt member 41 Bolt body portion 41a Thread groove

Claims (1)

[Scope of utility model registration request] 1. A flange portion provided at an end portion of a synthetic resin pipe having a flange portion at an end portion, and a flange which is rotatable with respect to the synthetic resin pipe and is movable in the axial direction so as to abut against the flange portion. And a bolt member having a thread groove formed on the outer peripheral surface thereof, and a screw portion provided on the inner peripheral surface of the synthetic resin pipe fitted to the flange portion so that the flange portion is located inside. Is a cylindrical fitting part that is screwed into the thread groove of the bolt member, a connecting part connected to the fitting part so as to face the end surface of the flange part, and a pipe made of a material different from the synthetic resin pipe. A joint sleeve having a cylindrical joint main body extending from the joint so as to be separated from the joint so as to be fitted, and a joint of the flange end surface of the synthetic resin pipe and the joint sleeve. Pressure contact between the end surface of the And a ring-shaped sealing member for sealing the entire circumference in the circumferential direction, and a connecting structure for different types of pipes.