JPH0141162Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a conductor connecting device in which a solid cylindrical terminal whose end face is connected to a solid cylindrical terminal is inserted and fastened into the end of a cylindrical pipe-shaped conductor. Regarding.

[Conventional technology]

Normally, an indoor three-pole disconnector, especially a straight-cut disconnector, has a configuration as shown in FIG. A cylindrical movable contact 4 is movably provided in the conductor 3 while contacting the conductor 3 via a slider 5, and a movable contact is provided at the tip of an insulated operating lever 7 supported by a main shaft 6. 4
are connected, and the movable contact 4 moves up and down by the rotation of the main shaft 6, and the tip of the movable contact 4 touches the connecting conductor 8.
It is adapted to move toward and away from the fixed contact 9 connected to the fixed contact 9.

By the way, at the lower end of the conductor 3 of the through bushing 2, there is a connecting conductor 10 such as a copper bar that is perpendicular to the lower end of the conductor 3.
However, in this case, it is difficult to connect and connect the two directly, so conventionally, a solid cylindrical terminal 11 with a connecting part of the connecting conductor 10 on the end face has been used.
is used, which is fitted and fixed to the lower end of the conductor 3 to connect both the conductors 3 and 10.

In other words, the conventional conductor connection device of this type
It is configured as shown in FIG. 6 and FIG.
The lower end of the cylindrical pipe-shaped conductor 3 has a cutout groove 12 and a cutout groove 12 for imparting flexibility to the conductor 3.
Bolt insertion holes are formed at opposite positions sandwiching the conductor 3, and the solid cylindrical terminal 11, whose outer diameter is approximately the same as the inner diameter of the conductor 3, has a bolt insertion hole in its central part. 2 for attaching the connection conductor 10 on the bottom surface
Tap holes 13 are formed respectively.

When connecting the conductors, the terminal 11 is inserted into the lower end of the conductor 3, and then the bolt 15 with the flat washer 14 is inserted into each bolt insertion hole of the conductor 3 and the terminal 11.
A nut 17 is screwed onto the tip of the conductor 3 through another flat washer 14 and a spring washer 16, and the conductor 3 and the terminal 11 are tightened. The connecting conductor 10 is connected to the terminal 11 by screwing into the terminal 11, and both the conductors 3 and 10 are connected via the terminal 11.

In the disconnector equipped with this conductor connecting device, the current path when the disconnector is closed is as shown by the one-dot chain arrow in FIG.

However, in the conventional conductor connecting device, the conductor 3
Since the flat washer 14 is applied to the cylindrical curved surface of the cylindrical surface and the bolt is tightened through this, the flat washer 14 is applied during tightening.
becomes easily deformed, especially nut 17 and flat washer 1.
There is a gap between the bolt 15 and the nut 17, which makes it difficult to prevent the nut 17 from loosening.Moreover, the tightening force of the bolt 15 and the nut 17 partially acts on the conductor 3 through the flat washer 14. , the contact between the conductor 3 and the terminal 11 is insufficient, and the nut 17
This, combined with the looseness of the connector, makes the contact at the connection part unstable, resulting in reduced reliability.

On the other hand, as another conventional conductor connection device, the seventh
As shown in FIG. 8 and FIG. 8, two curved washers are formed into a curved shape having a radius of curvature that is almost the same as the outer diameter of the cylindrical pipe-shaped conductor 3, and have a bolt insertion hole 19 formed in the center thereof. 20, apply both the washers 20 to the outer peripheral surface of the conductor 3, and press the flat washer 14
Insert the bolt 15 equipped with the bolt 15 into each bolt insertion hole of the washer 20, the conductor 3, and the terminal 11,
A flat washer 14 and a spring washer 1 are attached to the tip of the bolt 15.
6, screw together the nut 17, and connect the conductor 3 and terminal 1.
There is one that is designed to fasten with 1.

However, in this case, although the curved washer 20 that is in surface contact with the outer peripheral surface of the conductor 3 is used, the flat washer 14 is deformed and the nut 17 is loosened, and the bolt 15 and nut 17 are
This has the drawback that the tightening force exerted partially on the conductor 3 through the contact portion between the flat washer 14 and the curved washer 20 makes it impossible to obtain sufficient contact pressure.

Therefore, as a device for solving the above-mentioned drawbacks, there is a conductor connecting device as shown in FIG.

That is, a concave inner wall surface and a planar outer wall surface having the same radius of curvature as the outer diameter of the cylindrical pipe-shaped conductor 3 are formed, the outer wall width dimension S is larger than the diameter L of the conductor 3, and inner and outer wall surfaces are formed at both ends, respectively. Two tightening washers 21 each having a through bolt insertion hole are provided,
The inner walls of both washers 21 are placed against the outer peripheral surface of the conductor 3, and both washers 21 are provided so as to sandwich the conductor 3, and the bolts 22 are inserted into the respective bolt insertion holes of both washers. A nut 24 is screwed onto the tip of 22 via a disc spring 23.

Therefore, by adopting such a configuration, the tightening force of the bolt 22 and the nut 24 can be reduced to that of both washers 2.
acts on the conductor 3 from the entire inner wall surface of each of the
Furthermore, since the head of the bolt 22 and the nut 24 are each received by the planar outer wall surface of the washer 21, an effect of preventing loosening can be obtained, and sufficient contact pressure can be obtained between the conductor 3 and the terminal 11.

However, in the case of the conventional device, since the width dimension S of the tightening washer 21 is formed larger than the diameter L of the conductor 3, when this is applied to a three-pole disconnector as shown in FIG. The dimension between the phase conductors 3, ie, the phase-to-phase dimension, must be increased, which inconveniently leads to an increase in the size of the device.

Furthermore, as is clear from Fig. 9, both washers 2
1 and the bolt 22 are arranged so as to surround the outside of the conductor 3, the magnetic flux around the conductor 3 when energized causes a one-turn magnetic flux through the washer 21 and the bolt 22, which may cause overheating. It is necessary to use non-magnetic materials for the tightening washer 21, bolt 22, etc., which limits the materials that can be used and increases the cost.

[Problem that the invention attempts to solve]

Therefore, in this invention, the contact between the cylindrical pipe-shaped conductor and the solid cylindrical terminal fitted to the end of the conductor is stabilized, and the device is not made larger and special materials are used. It is an object of the present invention to provide a means for obtaining a sufficient locking effect on bolts and nuts that fasten conductors and terminals without using them.

[Means for solving problems]

This invention consists of a cylindrical pipe-shaped conductor having a notched groove and a bolt insertion hole at the end, and a solid cylindrical conductor having a bolt insertion hole fitted into the end of the conductor and a connecting conductor connected to the end surface. a terminal, a concave inner wall surface and a planar outer wall surface having the same radius of curvature as the outer diameter of the conductor, having a bolt insertion hole in the center, and having an outer wall width smaller than the diameter of the conductor; two washers applied to the outer peripheral surface; a bolt inserted into each of the insertion holes of the washers, the conductor, and the terminal; and a bolt threaded onto the bolt to fasten the conductor and the terminal. It is equipped with nuts.

[Effect]

Therefore, in the conductor connecting device of this invention, the tightening force of the bolt and nut acts on the conductor through the two washers, each of which has a concave inner wall surface against the outer peripheral surface of the conductor, and Since the entire wall surface presses against the conductor, the contact between the conductor and the terminal is stable, and since the head of the bolt and the nut each touch the flat outer wall surface of the washer, the washer does not deform when tightening. Sufficient anti-loosening effect can be obtained without any problems.

〔Example〕

Next, this invention will be explained in detail with reference to FIGS. 1 to 3 showing one embodiment thereof.

In these drawings, the same symbols as above indicate the same or equivalent parts, and the difference from the above is that two special washers 25 are applied to the outer peripheral surface of the cylindrical pipe-shaped conductor 3. As shown in FIG. 3, a concave inner wall surface 26 having the same radius of curvature as the outer diameter of the conductor 3 is formed on one side, a planar outer wall surface 27 is formed on the other side, and a bolt insertion hole 28 is formed in the center. and the outer wall width dimension S′ is conductor 3
The point is that two special washers 25 smaller than the outer diameter L of the two special washers 25 are provided.

When connecting the conductors, the terminal 11 is inserted into the lower end of the conductor 3, the bolt insertion hole of the terminal 11 and both bolt insertion holes of the conductor 3 are inserted, and then the inner wall surface of each of the two special washers 25 is inserted. 26 to conductor 3
and align each bolt insertion hole 28 with the bolt insertion hole of the conductor 3, insert the bolt 15 into each of the insertion holes of both washers 25, the conductor 3, and the terminal 11, and The nut 17 is screwed onto the conductor 3 through the disc spring 29.
and the terminal 11. Further, the connecting conductor 10 is fastened to the lower surface of the terminal 11 with a hexagon socket head bolt 18, and both conductors 3 and 10 are connected via the terminal 11.

Therefore, when the bolts 15 and nuts 17 are tightened, both special washers 25 press the conductor 3 from both sides with the entire inner wall surface 26 of the special washers 25.
A tightening force acts on the conductor 3 over a wide range, and since the head of the bolt 15 and the nut 17 are received by the outer wall surfaces 27 of both special washers 25, a loosening effect is obtained, and the conductor 3 and the terminal 11 are Sufficient contact pressure can be obtained.

Further, the width dimension S' of the special washers 25 on both sides of the conductor 3 is smaller than the diameter L of the conductor 3, and the conductor 3 and the terminal 11 are fastened together with a single bolt 15 passing through the center. Therefore, when electricity is applied, no one-turn occurs due to the magnetic flux around the conductor 3, and there is no need to construct the washer 25 etc. with a special material.Furthermore, this conductor connecting device can be used in the three-pole disconnector shown in Figure 4. If applied, special washer 25
Since the conductor 3 does not protrude from the conductor 3 in the interphase direction, there is no need to increase the interphase dimension.

[Effect of idea]

As described above, according to the conductor connection device of this invention, it is possible to connect a cylindrical pipe-shaped conductor and a medium inserted therein without increasing the size of the device or using special materials for washers, bolts, etc. It is possible to tighten the real cylindrical terminal in a stable contact state, and it is possible to improve the reliability of the contact portion.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the conductor connecting device of this invention, Figure 1 is a partially cutaway front view of the main part, Figure 2 is a bottom view of the main part with the connecting conductor removed,
Figures 3a, b, and c are respectively a front view, a plan view, and a side view of the special washer; Figure 4 is a schematic sectional view of a straight-cut three-pole disconnector to which this type of conductor connecting device is applied; Figure 5 is a partially cutaway front view of a conventional conductor connecting device, FIG. 6 is a bottom view of a portion of FIG. 5, FIGS. 7 and 8 are other conventional devices, and FIG. 7 is a bottom view of a portion of the device. FIG. 8 is a front view of the tightening washer, and FIG. 9 is a bottom view of a part of another conventional device. 3... Conductor, 10... Connection conductor, 11... Terminal, 12... Notch groove, 15... Bolt, 17...
Nut, 25...Special washer, 26...Inner wall surface, 2
7...Outer wall surface, 28...Bolt insertion hole.

Claims (1)

[Scope of utility model registration request] a cylindrical pipe-shaped conductor having a notched groove and a bolt insertion hole at its end; a solid cylindrical terminal fitted into the end of the conductor and having a bolt insertion hole and connected to an end face with a connecting conductor; A concave inner wall surface and a planar outer wall surface having the same radius of curvature as the outer diameter of the conductor are formed, and a bolt insertion hole is formed in the center, and the outer wall width dimension is smaller than the diameter of the conductor, and the surface is placed on the outer peripheral surface of the conductor. a bolt inserted into each of the insertion holes of the two washers, the conductor, and the terminal; and a nut screwed onto the bolt and tightening the conductor and the terminal. conductor connection device.