JPH0613579Y2 - Preformed armor rod - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) In the present invention, in the electric wire connecting portion by the straight-line sleeve or the like, the electric connection of the connecting portion is defective, the electric resistance is increased, and the heat is generated accordingly. At this time, the present invention relates to a preformed armor rod for electrically connecting the conductors at both ends of the connecting portion to support this.

(Prior art) In the electric wire connection part by a connecting pipe such as a straight sleeve,
Since the outer diameter of the connecting pipe is larger than the outer diameter of the electric wire, even if you try to wind a preformed armor rod with a constant pitch and inner diameter that matches the electric wire, the connecting pipe part will not fit the connecting pipe, so you can not wind it well, If you try to wind it forcibly, the rod may be damaged, uneven, or deformed.
The performance is not satisfied, and there is a big problem especially in a connecting pipe with a long length.

The one shown in FIG. 2 is known as a conventional connection part. As shown in FIG. 3, a plurality of armor rods 1 preformed at a constant pitch from one end to the other end were prepared, and a twisted portion 2 was formed in the center of these as shown in FIG. 2 (a). Prepare two sets of things. Then, the electric wire is wound on both sides of the connecting pipe 3 so that the twisted portion 2 straddles over the connecting pipe 3 in FIG. 2 (b).

However, in such a structure, as the size of the twisted portion 2 in the central portion becomes larger, there is a problem in terms of the capability of the processing machine or the stress received by the armor rod.

Further, a plurality of preformed door armor rods forming a set are wound at the same time to form the twisted portion 2, but a large size requires a large force and winding is difficult.

Further, after winding, the twisted portion 2 in the central portion protruded to the side, and the finished shape was not good. Further, because of this protrusion, the separation distance from the other-phase conductor and the ground is reduced, and the potential gradient of the same portion is increased, so that the risk of corona discharge generation in the high-voltage line is also increased.

Furthermore, there is a risk that the position where the processing of the central twisting processing portion 2 is started competes with the electric wire and the electric wire is damaged by vibration.

(Problems to be solved by the invention) In view of the problems of the conventional type, 1) it can be smoothly wound around the connecting pipe portion, 2) it is possible to wind each strand of wire one by one, and the mounting work is easy And good electrical contact, 3) it can be wound tightly around the wire and the connecting pipe without the wire rising or the overall shape being distorted, and 4) sufficient to compensate for the deteriorated connecting pipe. It is an object of the present invention to provide a preformed armor rod that has electrical performance, obtains a bypass function, and enables the above points.

(Means for Solving the Problems According to the Invention) In the preformed door armor rod 6 formed in a spiral shape for electrically connecting the connecting portion of the electric wire, the preformed door armor rod 6 is a connecting pipe whose length is substantially equal to the length of the connecting pipe 5. It is composed of a winding part b and wire winding parts a ₁ and a ₂ which are continuous on both sides of the winding part b and have substantially equal lengths on the left and right, and the inner diameter D of the connecting tube winding part b at the central part of the armor rod is The diameter of the circumscribing circle of the connecting pipe 5 was adjusted, and the inner diameter d of the wire winding portions a ₁ and a ₂ on both sides was adjusted to the outer diameter of the electric wire 4.

(Example) It demonstrates based on FIG. 1 (a), (b), (c), (d). FIG. 1 (a) shows a state in which the electric wires 4 and 4 are connected by a connecting pipe 5. The connecting pipe 5 is initially round pipe-shaped (electric wires are inserted from both ends and generally has no holes), and is compressed with a die to produce the connecting pipe 5, as shown in FIG. 1 (d).
As shown in FIG. 5, the electric wires 4 and 4 are connected by compressing into a hexagonal cross section. Then, by winding a plurality of preformed armor rods 6 around the connecting pipe 5 as shown in FIG. 1 (b), it is impossible to force the portion of the connecting pipe 5 compressed into a hexagonal cross section as shown in FIG. 1 (c). Instead, it can be wrapped tightly around electric wires and connecting pipes, and it has good electrical contact and can be formed smartly in appearance.

The preformed armor rod 6 is shown in Fig. 1 (b).
As shown in FIG. 3, the spiral inner diameter D of the connecting tube winding portion b in the central portion is smaller than that of a known preformed door armor rod formed in a uniform spiral shape as a whole as shown in FIG. The diameter H of the circumscribed circle of the connecting pipe 5 compressed into a hexagonal cross section with a compression die (not shown) (see FIG. 1).
(D)) to be larger than the spiral inner diameter d of the left and right wire winding parts a ₁ and a ₂ continuous with the connecting tube winding part b (D
> D). The inner diameter D is matched with the diameter H of the hexagonal circumscribing circle of the connecting pipe 5, but it is common sense for those skilled in the art to make the inner diameter D small by considering the tightening margin. Similarly, the inner diameter d is the electric wire 4
It is recommended to make it slightly smaller and check the tightening allowance.

When the product molded in the shape of FIG. 1 (b) is wound around the connection portion of FIG. 1 (a), it is wound with an appropriate tightening margin as shown in FIG. It can be formed into a smart shape with no protrusion.

(Effect) The diameter H of the circumscribed circle of the connecting pipe 5 in which the spiral inner diameter D of the central portion of the preformed armor rod 6 is compressed into a hexagon
Since it was molded according to 1), there is no protrusion after winding and mounting, and the appearance is smart. 2) Since the strands are divided one by one, it is possible to wind an appropriate number of strands, and it is possible to easily wind even large-diameter electric wires. 3) Since it is wound tightly around the electric wire and the connecting pipe, the contact point is increased and the electrical performance can be compensated by adding a bypass structure to the deteriorated connecting pipe.

[Brief description of drawings]

FIG. 1 (a) shows electric wires connected by a connecting pipe. FIG. 1 (b) shows a preformed armor rod wound around the connecting pipe portion. FIG. 1 (c) shows a state in which a plurality of preformed armor rods of FIG. 1 (b) are wound around the connecting pipe portion of FIG. 1 (a). FIG. 1 (d) is a left side view of FIG. 1 (a). FIG. 2 (a) shows an armor rod wound around a conventional connecting pipe portion. FIG. 2 (b) shows electric wires connected by a connecting pipe. FIG. 2 (c) shows the connection part around which the armor rod of FIG. 1 (a) is wound. FIG. 3 shows a conventional general type preformed door armor rod. In Figure; 1 ...... armor rods, 2 ...... twisting processing unit 3 ...... connecting pipe, 4 ...... wire 5 ...... connecting pipe 6 ...... preformed armor rods a _1, a ₂ ...... wire winding portion, b: Connection tube winding part

Claims (1)

[Scope of utility model registration request] 1. A preformed door armor rod (6) formed in a spiral shape for electrically connecting a connecting portion of an electric wire.
The connecting pipe winding portion (b) having the preformed armor rod (6) substantially equal to the length of the connecting pipe (5) and the left and right substantially equal lengths continuous on both sides of the winding portion (b). Wire winding part
(a ₁ , a ₂ ), the inner diameter D of the connecting tube winding portion (b) at the center of the armor rod is adjusted to the diameter of the circumscribing circle of the connecting tube (5), and the wire winding on both sides is performed. A preformed door armor rod, characterized in that the inner diameter d of the parts (a ₁ , a ₂ ) is formed to match the outer diameter of the electric wire (4).