JPH109457A - Pipe fittings - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a firm fusion connection of members each of which is made of different resin by providing pipe joint parts made of synthetic resin at both ends of a joint body made of metal, and connecting the members to the joint parts, each being molded with the same kind of resin as the member. SOLUTION: A joint part 12 made of high density polyethylene 12 is provided at one end of a joint body 11 and a joint part 13 made of a low density polyethylene is provided at the other end of the joint body 11 integrally by injection molding. A heater is applied to an outer peripheral surface of the joint part 12 made of high density polyethylene and an inner peripheral surface of a branch joint 2a to melt them, and then fitting is carried out. The heater is applied to an outer peripheral surface of the joint part 13 made of low density polyethylene and an outer peripheral surface of a polyethylene pipe 3a to melt them, and then fitting is carried out. Accordingly, the branch joint 2a and the pipe 3a each of which is made of different kind of resin can be fixedly fusion jointed to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin pipe joint suitable for connecting different kinds of synthetic resin pipes.

[0002]

2. Description of the Related Art Conventionally, in the field of piping such as gas pipes and hot water supply pipes, synthetic resin pipes such as polyethylene and polybutene have been used, and a pipe joint made of the same kind of synthetic resin as the synthetic resin pipe has been used for the connection. Have been. For example, a low-density polyethylene resin pipe joint is used for connecting low-density polyethylene pipes, and a polybutene pipe joint is used for connecting polybutene pipes.

[0003]

However, at a pipe construction site, a situation arises in which a high-density polyethylene pipe must be connected to a low-density polyethylene pipe, or a polyethylene pipe and a polybutene pipe must be connected. However, there was no pipe joint that could easily and reliably connect different kinds of synthetic resin pipes.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a pipe joint which can easily and surely connect different kinds of synthetic resin pipes.

[0005]

The present invention is characterized in that synthetic resin joints are provided at both ends of a metal joint main body, and each joint is formed of the same resin as the synthetic resin pipe to be connected. I do. In addition, when a heating wire is buried in at least one joint surface of the synthetic resin joint, at the time of piping construction at the site, simply heating the heating wire by applying a current to the heating wire, the synthetic resin pipe can be easily formed. Can be connected.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a half sectional view of a pipe joint showing one embodiment of the present invention. Reference numeral 11 in the drawing denotes a joint body 11 made of gun metal, and a joint portion 12 made of high-density polyethylene is provided at one end of the joint body 11 and a joint portion 13 made of low-density polyethylene is provided integrally at the other end by injection molding. Is provided.
The joints 12 and 13 are marked with high-density polyethylene and low-density polyethylene, so that the joints 12 and 13 can be fusion-bonded to a high-density polyethylene pipe and a low-density polyethylene pipe. ing.

FIG. 2 is a partially cutaway front view showing a state in which a branch joint 2a made of high-density polyethylene and a low-density polyethylene pipe 3a are fusion-bonded using the pipe joint 1a. In this case, the outer peripheral surface of the joint portion 12 and the inner peripheral surface of the joint of the branch joint 2a are melted by applying a heater, and then fitted. Further, the branch joint 2a and the pipe 3 made of different kinds of resin are merely inserted by melting the outer peripheral surface of the joint portion 13 and the inner peripheral surface of the polyethylene tube 3a by applying a heating heater and then inserting the same.
a can be firmly fusion bonded.

FIG. 3 is a sectional view of a pipe joint showing another embodiment of the present invention. In the pipe joint 1b of this embodiment, a joint part 12 made of polyethylene is provided at one end of a joint body 11 made of gunmetal, and a joint part 13 made of polybutene is provided integrally by injection molding at the other end. Heating wires 4 are helically embedded at predetermined intervals on the inner peripheral surfaces of the joint portions 12 and 13, and both ends of the heating wires 4 are connected to terminal pins 41 protruding from the outer periphery of the joint portions 12 and 13. Connected. In the case of this embodiment, the joint 1
The polyethylene pipe and the polybutene pipe are firmly fused by simply inserting a polyethylene pipe into the pipe 2 and a polybutene pipe into the joint 13 and supplying electricity to the heating wires 4 embedded in the joints 12 and 13 to generate heat. Can be joined.

FIG. 4 is a sectional view of a pipe joint showing still another embodiment of the present invention. FIG. 3 shows a pipe joint 1c of this embodiment.
The heating wire 4 is removed from the joint portion 12 of the pipe joint 1b shown in FIG. In the case of the pipe joint 1c, the electric heater is applied to the inner peripheral surface of the socket of the joint portion 12 and the outer peripheral surface of the end of the polyethylene pipe 2b, and then fitted. Further, the polybutene tube 3b is fitted into the joint portion 13 and the heating wire 4 is inserted.
Is heated to perform fusion bonding.

FIGS. 5 and 6 are half judgment diagrams of another embodiment in which the present invention is applied to an elbow joint. Elbow joint 1d,
In FIG. 1e, joint portions 12 and 13 made of different resins are integrally provided at both ends of a metal joint main body 11 curved at 90 degrees. The joints 12 and 13 can be formed of an appropriate resin that matches the resin constituting the connected member, and the heating wires 4 are helically embedded at predetermined intervals on the inner peripheral surfaces of the joints 12 and 13. Have been. In the case of the elbow joints 1d and 1e, pipes made of the same kind of resin are inserted into the respective joint sections 12 and 13 and then the heating wire 4 is energized to generate heat. Can be.

[0011]

As described in detail above, the pipe joint of the present invention
Since the joint parts made of synthetic resin are provided at both ends of the metal joint body, and each joint part is molded with the same kind of resin as the connected member to be connected, the connected members made of different resins are strongly fused and joined. Can be. Further, when the heating wire is buried in the joint surface of the joint portion, fusion welding can be performed only by applying heat to the heating wire to generate heat, and piping work on site can be performed simply and reliably.

[Brief description of the drawings]

FIG. 1 is a half sectional view of a pipe joint showing one embodiment of the present invention.

FIG. 2 is a partially cutaway sectional view showing a connection state between a branch joint and a pipe using the pipe joint shown in FIG. 1;

FIG. 3 is a half sectional view of a pipe joint showing another embodiment of the present invention.

FIG. 4 is a half sectional view of a pipe joint according to still another embodiment of the present invention.

FIG. 5 is a half sectional view of a pipe joint showing an embodiment of the present invention applied to an elbow joint.

FIG. 6 is a half sectional view of a pipe joint showing another embodiment of the present invention applied to an elbow joint.

[Explanation of symbols]

 1a to 1e Pipe joint 11 Metal joint body 12, 13 Joint part

Claims (2)

[Claims] 1. A pipe joint characterized in that synthetic metal joints are provided at both ends of a metal joint main body, and each joint is formed of the same resin as a connected member to be connected. 2. A heating wire is embedded in at least one joining surface of the synthetic resin joint.
The described pipe fitting.