JPH062796A - Thermally fused coupling - Google Patents

Abstract

PURPOSE:To provide a thermally fused coupling which can carry out fusion work efficiently and does not require heat insulating work. CONSTITUTION:A thermally fused coupling 1 is constituted so that a fused part 20 in which a heating coil 21 is embedded is formed on the inner peripheral surface of a coupling body 2 and a resin pipe 4 can be inserted into the fused part 20, and a heat shielding layer 3 which surrounds the outer peripheral surface of the fused part 20 is formed on the inside or outside of the coupling body 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat fusion joint.

[0002]

2. Description of the Related Art Conventionally, an electric fusion splicing joint has been known as a joint for connecting end portions of resin pipes. That is, in this electric fusion joint, after inserting the end portion of the resin pipe into the joint body, the coil is heated by energization to melt the fitting portion between the resin pipe and the joint body and connect the both. Has been done.

[0003]

However, in the case of the above-mentioned conventional electric fusion joint, even if the coil is heated by energization, heat easily escapes from the joint body, resulting in energy loss during fusion. Especially when fusion occurs at low temperature,
Heat easily escapes, which causes inconvenience such as long heating time.

Further, such as hot water supply pipes, heating and cooling pipes, and other antifreezing pipes in cold regions, where electric insulation is applied to a place where the outer peripheral surface after the pipes must be covered with a heat insulating material. When the joint is used, the outer diameter is larger than that of the resin pipe, so it is necessary to prepare a heat insulating material different from that of the resin pipe. Further, there is a problem that the heat insulating work is troublesome, for example, a heat insulating material has to be provided so that a gap is not formed in a portion where an outer diameter difference between the electric fusion joint and the resin pipe.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat-sealing joint that enables efficient welding work and does not require heat-retaining work.

[0006]

A heat fusion-bonded joint of the present invention for solving the above-mentioned problems has a fusion-bonded portion in which a coil for generating heat is embedded in the inner peripheral surface of a joint body. A heat-sealing joint in which a resin pipe can be inserted into the fusion-bonding part, wherein a heat-insulating layer adapted to surround the outer peripheral surface of the fusion-bonding part is formed inside or outside the joint body. is there.

[0007]

According to the present invention, a heat insulating layer is formed inside or outside the joint body so as to surround the outer peripheral surface of the fusion-bonded portion. The layers prevent heat dissipation to the outside.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows the overall structure of the heat fusion joint 1.

That is, the heat fusion-bonded joint 1 comprises a joint body 2 and a fusion-bonded portion 20 formed on the inner peripheral surface thereof.
The heat insulating layer 3 is formed on the outer peripheral portion of the so as to surround the outer peripheral portion of the fusion-bonded portion 20.

The joint body 2 is formed in a cylindrical shape,
At both ends thereof, fusion-bonded portions 20 to which the resin pipe 4 can be fitted are formed. Further, a stopper 22 is provided at the central portion so as to prevent the resin pipe 4 from penetrating therethrough.

A coil 21 is embedded in the fused portion 20. The coil 21 is heated to generate heat.
The peripheral resin is melted. That is, by inserting the resin pipe 4 into the fusion-bonding portion 20 and causing the coil 21 to generate heat, the inner peripheral surface of the fusion-bonding portion 20 and the outer peripheral surface of the resin pipe 4 are melted and fused. The heat of the coil 21 may be generated by energizing the coil 21 or by electromagnetic induction heating. However, when heat is generated by energizing, a terminal (not shown) for energizing must be led out of the joint body 2.

The heat insulating layer 3 is provided so as to surround the entire outer peripheral portion of the joint body 2. The heat insulating layer 3 has a thickness of about 30 mm, preferably about 5 to 15 mm so as to cover the whole. The heat insulating layer 3 has a thermal conductivity of 0.005 to 0.1,
It is desirable to use a material of 0.03 or less. Specifically, foamed urethane, polyethylene, glass wool and the like can be used. As a method of forming such a heat insulating layer 3, the material forming the heat insulating layer 3 is manually wound around the outer peripheral portion of the joint body 2, or the joint body 2 is fitted inside the cylindrical heat insulating layer 3. Alternatively, the material forming the heat insulating layer 3 may be directly injection-molded on the outer peripheral portion of the joint body 2.

The heat insulating layer 3 is not limited to the one covering the entire outer peripheral portion of the joint body 2 as described above. For example, as shown in FIG. A heat insulating layer 3 is formed by forming a cylindrical hollow portion 30 inside the joint body 2 so as to be interposed between the fusion portion 20 located inside and the outer surface of the joint body 2. May be. In this case, when the joint body 2 is molded, the hollow portion 30 can be formed by insert molding inside the joint body 2.

According to the heat-sealing joint 1 thus configured, the heat generated by the coil 21 of the fusion-bonding portion 20 at the time of fusion can be prevented from escaping to the outside by the heat insulating layer 3, so that it is efficient. Can generate fever.

Further, even when it is used in a place where coating of a heat insulating material (not shown) is required after the construction, since the heat insulating layer 3 has already been formed in this heat fusion joint 1, Since only the resin pipe 4 connected to the dressing joint 1 needs to be covered with the heat insulating material, the work of covering the heat insulating material can be easily performed.

In this embodiment, the socket-type heat-sealing joint 1 for connecting the resin tubes 4 to each other on the same axis is described. However, the heat-sealing joint 1 is not limited to such a heat-sealing joint 1. Elbow joints, cheese joints, bend joints, different-diameter joints, and other heat-sealing joints of various shapes can be similarly configured.

Further, the resin pipe 4 is provided on the inner peripheral portion of the heat fusion joint 1.
The heat fusion-bonding joint 1 may be formed with a core (not shown) for supporting the inner peripheral portion of the above.

[0019]

As described above, according to the present invention, even when the coil of the fusion-bonded portion is heated, the heat insulating layer can prevent the heat radiation to the outside, so that the energy loss is not generated and the efficiency is improved. Good fusion work can be done.

Further, since the heat insulating layer can prevent the heat radiation to the outside, even if the heat insulating material is provided after the construction, it is not necessary to provide it on the heat fusion joint, and the heat insulating effect is provided only by providing the resin pipe portion. Can be obtained.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an outline of an overall configuration of a heat fusion joint.

FIG. 2 is a partially cutaway side view showing another embodiment of the heat insulation layer of the heat fusion joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermal fusion joint 2 Joint main body 20 Fusion part 21 Coil 3 Thermal insulation layer 4 Resin pipe

Claims (1)

[Claims] 1. A heat-fusion joint in which a fusion-bonding portion in which a coil that generates heat is embedded is formed on the inner peripheral surface of a joint body, and a resin pipe can be inserted into the fusion-bonding portion. A heat-sealing joint, characterized in that a heat-insulating layer is formed inside or outside the joint body so as to surround the outer peripheral surface of the fusion-bonding portion.