JPH094782A - Electric fusion joint - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the electrical connection between the power supply terminal on the fusion controller side and the electrode fitting on the joint body side in the electric fusion joint. [Structure] In an electric fusion joint 10 capable of connecting the electrode fitting 13 on the joint body 11 side and the power supply terminals 21A and 21B on the fusion controller 20 side, the electrode fitting 13 and the power supply terminal 21A are electrically contacted. A belt provided with a convex belt 15 on one side of the connecting portion.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an electrofusion joint.

[0002]

2. Description of the Related Art Conventionally, there is an electric fusion joint as described in Japanese Patent Publication No. 1-40743. This electric fusion joint has a resin layer on the surface of the fitting portion of the pipe joint and a heating wire embedded in the resin layer when the pipe to be connected is fitted and connected to the fitting portion of the pipe joint. , The surface of the pipe to be connected is also a resin layer, and while the surface resin layer of the pipe to be connected is fitted to the surface resin layer of the fitting part of the pipe joint, the heating wire is energized to generate heat, The resin layer and the resin layer of the pipe to be connected are fused together.

In the prior art, the pair of power supply terminals connected to the fusion controller are connected to the electrode fittings provided at both ends of the heating wire to energize the heating element. I am trying to do it.

Further, in the prior art, a joint fusion time identifying resistor is built in the above-mentioned electrode fitting provided on the joint body side, and this electrode fitting is screwed to the joint body at the construction site for use. I am trying. For this reason, at the manufacturing and transportation stages, the electrode fittings are handled separately as a separate body from the joint body and still in a one-to-one combination with the joint body.

[0005]

However, the prior art has the following problems. Since the power supply terminal on the fusion controller side and the electrode fitting on the joint body side are connected by a pin joint, it is difficult to secure stable electrical connectivity while reducing contact resistance.

Since the joint fusion bonding time identifying resistor is built in the electrode body on the joint body side, an identifying resistor is attached to each joint, and the joint manufacturing inspection and packing are complicated. become. Further, the identification resistor may be destroyed by electrostatic discharge due to rubbing during transportation.

It is an object of the present invention to improve the electrical connectivity between the power supply terminal on the fusion controller side and the electrode fitting on the joint body side in the electric fusion joint.

Further, according to the present invention, when the joint fusing time identifying resistor is used in the electric fusion joint, the joint is manufactured, packaged,
The purpose is to improve handling during transportation.

[0009]

According to a first aspect of the present invention, there is provided a pair of power feeds in which a heating wire is built in a joint body, electrode fittings are provided at both ends of the heating wire, and which is connected to a fusion controller. An electric fusion joint capable of heating a heating wire by connecting each of the terminals to the electrode fitting, wherein a convex belt belt is provided at one of the connecting portions of the electrode fitting and the power supply terminal which are in electrical contact with each other. Is.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, the power supply terminal connected to the fusion controller has a base end portion on the fusion controller side and a joint fusion bond. The fusion controller has a built-in time identification resistor, is attached to and detached from the base end portion, and has a tip end portion that is fitted and connected to the electrode fitting of the joint body, and the fusion controller has a resistance value of the identification resistor. It is possible to control the fusion time of the joint by reading

According to a third aspect of the present invention, in addition to the second aspect of the present invention, the fitting hole diameter between the tip portion of the power supply terminal and the electrode fitting is equal to the resistance value of the identification resistor. It is designed according to the requirements.

[0012]

According to the first aspect of the present invention, the following operations are provided. Since a convex belt is provided at the electrical connection between the power supply terminal on the fusion controller side and the electrode fitting on the joint body side, the contact resistance is minimized and the insertion / removal force during connection is made uniform and repeatable insertion / removal It is possible to stabilize the electrical connectivity to the.

According to the second aspect of the present invention, the following operations are provided. Since the power supply terminal on the side of the fusion controller has a tip portion in which the joint fusion time identification resistor is incorporated, it is not necessary to attach the identification resistor to the joint body of the electric fusion joint. That is, at the time of construction, the power supply terminal on the fusion controller side can be configured by selectively attaching the tip end portion provided with the identification resistor suitable for the joint type to the base end portion. Therefore, it is not necessary to attach an identification resistor to each of the electric fusion joints, and manufacturing inspection and packaging of the electric fusion joint can be simplified. In addition, it is possible to avoid the possibility that electrostatic discharge due to rubbing during transportation of the electric fusion joint destroys the identification resistor.

According to the third aspect of the present invention, the following operations are provided. At the time of installation, the tip part of the power supply terminal on the fusion controller side is combined with the fitting type and the identification resistor only by checking the fitting hole diameters of the fittings on the fitting body side. Can be adapted. That is, it is possible to easily combine the identification resistors with the joint type without any mistake.

[0015]

EXAMPLE FIG. 1 is a schematic view showing an electric fusion joint of the first embodiment, FIG. 2 is a schematic view showing electrode fittings, FIG. 3 is a schematic view showing electrode fittings and a convex belt, and FIG. 7 is an electric circuit diagram showing the deposition controller, FIG. 5 is a schematic diagram showing the power supply terminal, FIG. 6 is an electrical circuit diagram showing the fusion controller of the second embodiment, and FIG.
Is a schematic diagram showing a power supply terminal, and FIG. 8 is a schematic diagram showing an electric fusion joint of the third embodiment.

(First Embodiment) (FIGS. 1 to 5) In an electric fusion splicing joint 10, as shown in FIG. 1, pipes 1 and 1 to be connected are fitted and connected to a fitting portion of a joint body 11. At this time, the whole including the surface of the fitting portion of the joint body 11 is made of a resin layer such as polyethylene, and the heating wire 12 is built in this resin layer, and the whole including the surfaces of the connected pipes 1 and 1 is made of polyethylene or the like. It is a resin layer. And the electric fusion joint 10 is
In a state where the surface resin layer of the pipes 1 and 1 to be connected is fitted to the surface resin layer of the fitting portion of the joint body 11, the heating wire 12 is energized to generate heat and is connected to the resin layer of the fitting portion of the joint body 11. The resin layers of the tubes 1 and 1 are fused together.

At this time, in the electrofusion joint 10, as shown in FIG. 4, each of the pair of power supply terminals 21A and 21B connected to the fusion controller 20 is connected to the joint body 11
The heating wire 12 is energized by being connected to the electrode fittings 13, 13 which are insert-molded into and are connected to both ends of the heating wire 12.

Further, the electrode fitting 13 of the electric fusion joint 10
2 is provided with a crimp terminal 14 for connecting the heating wire 12 as shown in FIGS. The crimp terminal 14 is of the JIS standard, and by using a commercially available crimp tool, it is possible to prevent the connection from being caulked and prevent it from coming off, and to mount the crimp terminal with high accuracy to reduce the contact resistance. Also, the electrode fitting 13 is
As shown in FIG. 3, a convex strip belt 15 is formed on the stepped inner diameter portion 13A.
Is buried. For the belt 15, a multi-ram band (manufactured by Swiss MC Co.) in which a hard copper alloy is hardened and spring properties are imparted can be used. Convex belt belt 1
5 is rounded into a C shape and has a strip-shaped ridge in the central portion to form a spring contact portion 15A. This convex belt 1
When 5 is inserted into the stepped inner diameter portion 13A of the electrode fitting 13, C
As a result of being compressed and inserted in the circumferential direction of the electrode fitting, it is spread by the reaction force and fitted to the stepped inner diameter portion 13A of the electrode fitting 13. Power supply terminals 21A, 21
When B is fitted, the strip-shaped contact portion 15A is surely contacted and also serves as a resistance for preventing the power supply terminals 21A and 21B from coming off during energization. When disconnecting the power supply terminals 21A and 21B,
The stepped portion of the stepped inner diameter portion 13A serves as a stopper for removing the convex strip belt 15, so that the convex strip belt 15 does not come off when the power supply terminals 21A and 21B are inserted and removed.

Further, the power supply terminal 2 of the fusion controller 20
As shown in FIG. 5, 1A includes a base end portion (plug) 22 on the side of the fusion controller 20 and a tip end portion (socket) 23 that is attached to and detached from the plug 22 via a one-piece one-touch connector 22A. The tip portion 23 has a built-in joint fusing time identifying resistor 24 according to the type of the electric fusion joint 10, and the convex strip belt 1 of the electrode fitting 13 on the joint body 11 side.
5 has a tip plug 23A that is fitted and connected. The tip portion 23 is a resistor 2 according to the type of the electric fusion joint 10.
You can replace the one with built-in 4. As shown in FIG. 4, the fusion controller 20 includes power supply terminals 21A and 21A.
At the same time that B is connected to the electrode fittings 13, 13 on the joint body 11 side, the resistance value of the resistor 24 is read to display the joint fusion time (energization time), and the heating wire 12 can be energized. Control the joint fusion time.

Here, the tip plug 23A of the tip portion 23 of the power supply terminal 21A and the convex belt 15 of the electrode fitting 13 are provided.
The fitting hole diameters of and are determined in accordance with the resistance value of the joint fusion time identification resistor 24 corresponding to the type of the electric fusion joint 10.

The operation of this embodiment will be described below. Power supply terminals 21A and 21B on the fusion controller 20 side
Since the convex belt 15 is provided in the electrical connection portion between the joint body 11 and the electrode fitting 13 side, the contact resistance is minimized, and the connecting / disconnecting force at the time of connection is made uniform, and the electrical connection is provided for repeated insertion / removability. It is possible to stabilize the sex.

Power supply terminal 21 on the side of the fusion controller 20
Since A has the tip portion 23 containing the joint-fusion-time identifying resistor 24, it is not necessary to attach the identifying resistor 24 to the joint body 11 of the electric fusion joint 10. That is, at the time of construction, the tip end portion 23 provided with the identification resistor 24 suitable for the joint type is selectively attached to the base end portion 22, so that the power supply terminal 21A on the fusion controller 20 side.
Can be configured. Therefore, it is not necessary to attach the identification resistor 24 to each of the electric fusion joints 10, and the manufacturing inspection and packaging of the electric fusion joint 10 can be simplified. Also,
It is also possible to avoid the possibility that electrostatic discharge due to rubbing or the like during transportation of the electric fusion joint 10 may destroy the identification resistor 24.

When the fusion controller 20 can identify the joint fusion time by reading the resistance value of the heating wire 12 of the electric fusion joint 10 without using the identification resistor, the power supply terminal 21A does not consist of the base end portion 22 and the tip end portion 23, but a straight plug having the same diameter can be adopted.

(Second Embodiment) (FIGS. 6 and 7) The second embodiment is different from the first embodiment in that a joint fusion time discriminating resistor 24 on the fusion controller 20 side is built-in. The connection detection switch 25 is provided at the tip portion 23 of the power supply terminal 21A. The switch 25 has a tip portion 2
3 is provided with an operating portion 25A protruding from the tip plug 23A, the power supply terminal 21A is fitted to the electrode fitting 13 on the joint body 11 side, and the operating portion 25A is pushed to the bottom of the stepped inner diameter portion 13A of the electrode fitting 13 to switch the switch. By turning on 25, the fusion controller 20 can read the resistance value of the identification resistor 24. That is, when the power supply terminals 21A and 21B are connected to the electrode fitting 13 on the joint body 11 side, the fusion controller 20 can start energization.

(Third Embodiment) (FIG. 8) The third embodiment differs from the first embodiment in that a convex strip belt 31 is attached around the power supply terminals 21A and 21B on the fusion controller 20 side. is there. The belt 31 is substantially the same as the convex belt 15. The electrode fitting 13 on the joint body 11 side is provided with a connection inner diameter portion 32 for the power supply terminals 21A and 21B.

The power supply terminal 21A of the third embodiment has the same base end portion 22, tip end portion 23, identification resistor 24, and connection detection switch as those of the power supply terminal 21A of the first and second embodiments. One having 25 can be adopted.

[0027]

As described above, according to the present invention, in the electric fusion joint, the electrical connectivity between the power supply terminal on the fusion controller side and the electrode fitting on the joint body side can be improved.

Further, according to the present invention, when the joint fusing time discriminating resistor is used in the electric fusion joint, the manufacture of the joint,
The handling during packing and transportation can be improved.

[Brief description of drawings]

FIG. 1 is a schematic view showing an electric fusion joint of the first embodiment.

FIG. 2 is a schematic view showing an electrode fitting.

FIG. 3 is a schematic view showing an electrode fitting and a convex belt.

FIG. 4 is an electric circuit diagram showing a fusion controller.

FIG. 5 is a schematic diagram showing a power supply terminal.

FIG. 6 is an electric circuit diagram showing a fusion controller according to a second embodiment.

FIG. 7 is a schematic diagram showing a power supply terminal.

FIG. 8 is a schematic view showing an electric fusion joint of the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electric fusion joint 11 Joint main body 12 Heating wire 13 Electrode metal fitting 15 Convex belt belt 20 Fusion controller 21A, 21B Power supply terminal 22 Base end portion 23 Tip portion 24 Identification resistor 31 Convex belt belt

Claims (3)

[Claims] 1. An electric heating wire is built in a joint body, electrode fittings are provided at both ends of the heating wire, and a pair of power supply terminals connected to a fusion controller are connected to the electrode fittings, respectively. An electric fusion splicing joint capable of generating heat from a heating wire, characterized in that a convex strip belt is provided at one of the connecting portions of the electrode fitting and the power supply terminal that electrically contact each other. 2. A power supply terminal connected to the fusion controller, which incorporates a proximal end portion on the fusion controller side and a joint fusion bonding time identification resistor and is attached to and detached from the proximal end portion. The electrofusion according to claim 1, further comprising: a tip portion fitted and connected to an electrode fitting of the joint body, wherein the fusion controller can control the fusion time of the joint by reading the resistance value of the identification resistor. Fitting. 3. The electric fusion joint according to claim 2, wherein a fitting hole diameter between the tip portion of the power supply terminal and the electrode fitting is determined according to a resistance value of the identification resistor.