JPS5926487Y2 - Conductor support device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a conductor support device in a reduced type switchgear or the like.

For example, in a reduced type switchgear, electrical equipment such as a circuit breaker or a disconnector is housed in a tank, and these electrical equipment are connected to each other by conductors.

This conductor is supported by a fixed support plate, such as the side wall 1a of the cubicle 1 as shown in FIG.

FIG. 1 is a schematic cutaway view of a main part showing the mounting state of a conventional conductor support device, and FIG. 2 is an enlarged view of the base (portion A) of the support insulator 4 in FIG. 1.

In FIG. 1, reference numeral 1 denotes a relay cubicle. A bus line 2 is connected to this cubicle 1. Cables for three phases are routed within this bus line 2. Each conductor 3 connected to a three-phase cable is relayed and supported by a support insulator 4, and a cubicle 1
It passes through an insulating spacer 5 fixed to the wall 1b and is taken out to the outside.

10 is a spacer mounting bolt.

To explain the conductor support device in detail, the conductor 3 is interposed between the two halves of the fixing fittings 6, and the upper and lower fixing fittings 6 are connected by appropriate means such as bolt tightening, and the bolts are connected to the supporting insulator. The conductor 3 is tightened and fixed to the upper end of the support insulator 4 by screwing into the mounting hole 4.

The base of the support insulator 4 will be described in detail with reference to FIG. 2. As shown in the figure, a large diameter portion 7a of a stud 7 having a T-shaped cross section is embedded and fixed in the bottom of the support insulator 4.

The protruding small diameter portion 7b of the stud 7 is threaded, and this small diameter portion 7a is attached to the inner circumferential surface of a cylindrical mounting boss 8 attached to the side wall 1a of the cubicle 1 and having a threaded inner circumferential surface. By adjusting the screwing depth of the small diameter portion 7b of the stud 7, the supporting height of the conductor 3, that is, the distance 1 dimension between the conductor 3 and the side wall 1a of the cubicle 1 can be adjusted.

After adjusting the support height, the stud 7 is fixed with a lock nut 9.

In the conductor support device constructed as described above, the bending moment (bending stress) is concentrated at the threaded portion B of the small diameter portion 7b of the stud 7 with the lock nut 9 and the mounting boss 8, and the trough of the small diameter portion 7b of the stud 7 The load is being applied by the diameter.

However, in a conductor support device for large currents, since a large current flows through the conductor 3, the supporting height and insulation distance of the conductor 3 must be increased, and the large current flowing through the conductor 3 causes Since the bending moment force (bending stress) applied to the support portion (the threaded portion of the stud 7) B of the support insulator 4 increases due to the electromagnetic repulsive force, the screwed portion B
In order to prevent the strength from becoming weak, the root diameter d of the stud 7b is
The support insulator 4 also has to be made large in diameter, resulting in an increase in the size of the support insulator 4 as a whole.

The present invention was devised to solve the above-mentioned problems, and will be explained below using examples.

FIG. 3 shows an embodiment of the conductor support device according to the present invention,
Components that are the same as those in FIGS. 1 and 2 or have the same functions are designated by the same reference numerals.

In the same figure, reference numeral 11 denotes a cylindrical mounting boss that is attached to the side surface 1a of the side surface 1 of the relay cubicle 1 and has a threaded inner and outer peripheral surface. The small diameter portion 7b of the stud 7 is screwed, and by adjusting the screwing depth of the small diameter portion 7b of the stud 7, the support height of the conductor 3, that is, the height of the support between the conductor 3 and the cubicle 1 is adjusted.
One dimension of the distance (insulation distance) between the side walls 1a is adjusted.

After adjusting the support height, the cap nut 12 having a cross-sectional shape as shown in FIG. is brought into contact with the flat lower surface 7C of the large diameter portion 7a of the stud 7, and the lower surface 7C of the large diameter portion 7a of the stud 7 is supported by the upper end surface 12a of the cap nut 12.

Here, the cap nut 12 locks the lower part of the large diameter portion 7a of the stud 7 and the outer diameter surface of the mounting boss 11.

In the present invention, the bending stress load applied to the cap nut 12 along with the locking action of the cap nut 12 is applied to the thread root diameter d2 cut on the outer periphery of the mounting boss 11, and the conventional diameter d,
(See Fig. 2) Since the bending stress load is applied to the diameter portion larger than that shown in Fig. 2, it is possible to receive a large moment force in terms of strength.

Therefore, the strength against bending stress load can be increased compared to the conventional one.

In addition, in FIG. 3, the external shape of the cap nut 12 is hexagonal,
Various shapes are possible, such as a round shape and a round shape with two sides.

Furthermore, although the bag nut 12 is used in this embodiment,
Instead of this cap nut 12, a nut 13 matched to the outer diameter of the mounting boss 11 may be used as shown in FIG.

As described above, the use of the conductor support device according to the present invention provides the following various effects.

(1) The bending moment force applied due to the electromagnetic repulsive force generated on the conductor 3 is the diameter d2 of the thread cut on the outer periphery of the mounting boss 11.
In addition, since the outer diameter portion is larger than that of the conventional d17 (see Fig. 2, φ), it can receive a moment force that is large in strength.

(2) Assuming that the bending moment load is the same as before, in this invention, the bending moment load point is received at the outer diameter d2φ of the mounting boss 11 instead of the inner diameter, so the diameter d1 of the protruding small diameter portion 7b of the stud 7 is changed from the conventional one. It can be made smaller in comparison, and the embedded part (large diameter part 7a) of the stud 7 at the bottom of the support insulator 4 can also be made smaller.

Therefore, the diameter of the support glass 4 can be made smaller than in the past, and the entire conductor support device can be made smaller in diameter and smaller than in the past.

(3) In the present invention, even if the size of the conductor support device is the same as the conventional conductor support device as shown in FIG. 2, a locking and reinforcing nut as shown in FIGS. 4a and 4b is used instead of the conventional lock nut 9). By using 12.13 and attaching it to the outer peripheral surface of the mounting boss 11 as shown in FIG. 3, it is possible to support a conductor through which a larger current flows.

[Brief explanation of drawings]

Fig. 1 is a schematic cutaway diagram of main parts showing the mounting situation of a conventional conductor support device, and Fig. 2 is a base part of the conductor support device shown in Fig. 1.
FIG. 3 is a cutaway assembly view of essential parts showing one embodiment of the conductor support device according to the present invention, and FIGS. 4 a and b are sectional views showing respective embodiments of the nut applied to the present invention. In the figure, 1 is a cubicle, 1a is a side wall, 3 is a conductor,
4 is a support insulator, 7 is a stud, 7a is a large diameter portion, 7b is a small diameter portion, 7C is a lower surface of a large diameter, 11 is a mounting boss, 12°1
3 indicates nuts.

Claims (1)

[Scope of utility model registration request] A cylindrical mounting boss 11 mounted on a fixed support plate and having threads cut on the inner and outer circumferential surfaces, and a locking and reinforcing nut screwed onto the outer circumferential surface of the mounting boss 11. ) 12.13, a support insulator 4 supporting the arranged conductor 3, a large diameter portion 7a embedded in the bottom of the support insulator 4, and a threaded and protruding small diameter portion 7b connected to the mounting boss. 11, and the lower surface 7C of the large diameter portion 7a.
and a stud 7 supported by the upper end surface of the nut 12, 13.