JPH05312298A - Manufacture of electric fusion joint - Google Patents

Abstract

PURPOSE:To obtain an electric fusion joint, at a desired position in the sheath of which a coil is positioned without deviation. CONSTITUTION:A coil 2 is covered by a sheath pipe 3 consisting the outer layer of a joint metal body, and after arranging the sheath pipe 3 and the coil 2 in a metal mold, resin is injected into the gap between the sheath pipe 3 and the coil 2 to form an electric fusion joint. Before arranging the sheath pipe 3 and the coil 2 in the metal mold, the sheath pipe 3 and the coil 2 are fused (f) for integration by a fusion member 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an electric fusion joint formed by using a sheath tube.

[0002]

2. Description of the Related Art Generally, an electric fusion splicing joint is known in which a coil which generates heat when energized is embedded in an inner peripheral surface of a joint body.

Conventionally, as one of the methods for manufacturing the electric fusion-bonded joint, the outer peripheral portion of the coil wound around the outer core is covered with a sheath tube, and these are set in a mold to form an outer core. There is known a method of injecting a resin material into a gap between the mold and the sheath tube and the coil to be integrated with the resin material (see, for example, JP-A-2-293121).

[0004]

However, in the case of the above-mentioned conventional method for manufacturing an electric fusion joint, since there is a narrow gap between the coil wound around the outer core and the sheath pipe, the sheath pipe is attached to this coil. If it is covered and set in the mold, the position of the coil cannot be confirmed and corrected from the outside, and it becomes difficult to perform axial positioning. As a result, the electric fusion-bonded joint in which the coil in the sheath tube is displaced is formed, resulting in a short circuit or connection failure during energization.

It is also conceivable to set the sheath tube and the coil in advance and then set them in the mold. However, when setting them in the mold, the position of the coil comes into contact with the mold. In many cases, there is a deviation, and even if the positioning is performed outside the mold, the positioning inside the mold cannot be performed firmly.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing an electric fusion joint in which a coil is positioned at a desired position in a sheath tube without being displaced. .

[0007]

In order to solve the above-mentioned problems, a method for manufacturing an electric fusion joint of the present invention is to cover the outer side of a coil in a wound state with a sheath tube constituting an outer layer of the joint body, A method for forming an electric fusion joint by injecting a resin material into a gap between the sheath tube and the coil after placing the tube and the coil in the die, wherein the sheath tube and the coil are placed in the die. First, the sheath tube and the coil are fused and integrated by a fusion member.

[0008]

According to the present invention, since the sheath tube and the coil are fused and integrated by the fusion member before the sheath tube and the coil are placed in the mold, the positional relationship between the sheath tube and the coil can be secured. It can be placed in the mold while it is positioned.

[0009]

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

FIG. 1 shows an outline of the overall structure of the electric fusion joint 1, and FIG. 2 shows the main part of the manufacturing process of the electric fusion joint 1.

That is, in the method for manufacturing the electric fusion-bonded joint 1, a sheath tube 3 forming an outer layer of the joint body 10 is covered on the outside of the coil 2 in a wound state, and the sheath tube 3 and the coil 2 are molded by a mold ( A resin material 4 is injected into a gap between the sheath tube 3 and the coil 2 to dispose the sheath tube 3 and the coil 2 in a mold ( Before being placed inside (not shown), the sheath tube 3 and the coil 2 are fused and integrated by the fusion member 5.

The coil 2 is covered with a resin layer 21 on its outer peripheral portion. First, the coil 2 is spirally wound so that the resin layers 21 are in close contact with each other to form a cylindrical bobbin 20.
To form. In this state, the inner diameter of the coil 2 is formed so as to correspond to the inner diameter of the electric fusion joint 1. The energizing terminals 22 are connected to both ends of the coil 2.

Next, the fusing members 5 are fused at four positions on the outer peripheral surface of the bobbin 20 on one end side at appropriate intervals. As shown in FIG. 3, the fusing member 5 is formed in a plate shape having a step portion 51, and in the state where the step portion 51 is in contact with the outer peripheral surface of the end portion of the bobbin 20, an electric iron (illustration is shown). Fusion is performed by (omission) or the like. The number of fusing members 5 to be fused is not particularly limited to four, and an appropriate number of fusing members 5 may be fused f as necessary.

Then, the sheath tube 3 is put on the bobbin 20 to which the fusion member 5 is fused. At this time, the sheath tube 3 is the joint body 1
It is formed in a cylindrical shape that constitutes the outer layer of No. 0, and has a hole 31 at a position where the energizing terminal 22 is inserted. Therefore, the current-carrying terminal 22 is inserted into this hole 31.
Then, the coil 2 is covered with the sheath tube 3. Further, in this state, a gap is formed between the sheath tube 3 and the coil 2, which is an unstable state in which positioning is not performed.

Therefore, after the bobbin 20 is positioned in the sheath tube 3, the fusing member 5 which is fused to the bobbin 20 is f.
The other end of the sheath tube 3 with an electric iron (not shown)
F is fused to the inner peripheral surface of the. To position the bobbin 20, as shown in FIG. 3, the other end of the fusing member 5 is previously set as a fusing member 5 having a predetermined length L, and the other end of the fusing member 5 is It can be positioned by matching with the end of the sheath tube 3. In addition, as shown in FIG.
It is also possible to perform the positioning by using the positioning jig 6 which can insert the bobbin 20 at the position of the distance A from the end of the sheath tube 3.

As described above, the bobbin 20 and the sheath tube 3 which are integrated by the fusion-bonding member 5 are arranged in a mold (not shown) by inserting a core (not shown) into the bobbin 20, and then the bobbin 20. The resin material 4 is injected into the gap with the sheath tube 3 to form the electric fusion joint 1.

In this embodiment, the bobbin 20 and the sheath tube 3 are fused and integrated with each other by the plate-shaped fusion member 5, but the plate-shaped fusion member 5 is not limited to this. Instead, it may have a rod shape or other various shapes. In addition, after positioning, the molten resin may be partially injected between the bobbin 20 and the sheath tube 3 with a hot melt gun (not shown) to achieve integration, or a welding rod (not shown).
For example, the molten resin may be partially melted by a method such as the above to achieve integration.

The shape of the electric fusion splicing joint 1 is not limited to that shown in FIG. 1, and the outer layer of the joint main body 10 is composed of the sheath tube 3, and the sheath tube 3 has a bobbin. The present invention can be applied to the manufacture of various electric fusion-bonded joints as long as 20 is arranged and molded. For example,
As shown in FIG. 4, the bobbin 2 is simply provided with the coil 2 in a wound state without the energizing terminal 22.
By arranging 0 in the sheath tube 3 and molding, the electric fusion joint by electromagnetic induction heating can be molded.

[0019]

As described above, according to the present invention, since the sheath tube and the coil can be placed in the mold with the positional relationship being firmly positioned, there is no short circuit due to misalignment or defective conduction. It is possible to manufacture various electric fusion-bonded joints.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the outline of the overall configuration of an electric fusion joint.

FIG. 2 is a process drawing showing a main part of a method for manufacturing an electric fusion joint.

FIG. 3 is a process drawing showing an example of a method of positioning the sheath tube and the bobbin.

FIG. 4 is a cross-sectional view showing another embodiment of the method for positioning the sheath tube and the bobbin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrofusion joint 10 Joint body 2 Coil 3 Sheath tube 4 Resin material 5 Fusion member f Fusion

Claims (1)

[Claims] 1. A wound coil is covered with a sheath tube constituting an outer layer of a joint body, the sheath tube and the coil are placed in a mold, and a resin material is placed in a gap between the sheath tube and the coil. Is a method of molding an electric fusion joint by injecting the sheath tube and the coil into the mold before the sheath tube and the coil are fused and integrated by a fusion member. A method for manufacturing an electric fusion joint.