JPH07230916A - Protective cover for bushing in electric apparatus - Google Patents

Abstract

PURPOSE:To provide a protective cover used for covering a bushing in its enclosure-type body, removed easily and reusable in an electric apparatus. CONSTITUTION:A cylindrical body is made up of half cylindrical members 10a and 10b and a fitting member for holding these half parts in a cylindrical body. An elastic supporting member 14 is formed like a slit belt with its corrugation crests projected on the inside face of the cylindrical member 10a, while an elastic supporting part 13 is formed like a thin belt with fins in a circumferential direction on the inside face of the cylindrical member 10b. In addition, an overall protective cover is made of soft polyethylene in a body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bushing protection cover for electric equipment having bushings such as transformers and circuit breakers.

[0002]

2. Description of the Related Art Salt-resistant bushings are often used as high-voltage bushings for electric equipment. As shown in FIG. 3, the bushing 1 is constructed by penetrating a lead wire 3 through a porcelain porcelain insulator tube 2 having a cylindrical shape and bonding a mold cone portion 4 to one end portion of the porcelain insulator tube 2. Is horizontally attached to the side wall 5 of the tank via a packing 6, and the porcelain insulator 2 largely protrudes to the outside to easily come into contact with other objects during transportation or in / out of a warehouse, so a protective cover is attached. . As shown in FIG. 4, conventionally, this protective cover is formed by winding a protective cover 7 which is a corrugated board around the entire outer periphery of the porcelain tube 2 and tightly fixing it with a band 8.
Alternatively, as shown in FIG. 5, a protective cover 9 integrally formed in a cylindrical shape with a material such as elastic foam plastic.
Was fixed to the outer peripheral surface of the porcelain bushing 2.

[0003]

However, the conventional corrugated cardboard protective cover 7 described above requires a lot of time and effort to wrap it around the outer peripheral surface of the porcelain tube 2 with a band and to remove it, and to foam it. A cylindrical protective cover 9 made of plastic has a bushing 1 having a lead wire 3.
When fitting on the outer peripheral surface of the porcelain porcelain tube 2, it takes time and effort to mount the lead wire 3 while passing it through the hollow of the protective cover 9, and the protective cover 9 is manufactured with a constant inner diameter, while the porcelain outer diameter is manufactured. Since the above variation occurs, even if a resilient material is used, it is difficult to fit if it is too hard, and when a gap is created, the protective cover 9 moves due to vibration during transportation and the porcelain tube 2
Can no longer be protected. In order to protect the mold cone portion 4, both the protective cover 7 and the protective cover 9 must have a long cylindrical portion, which requires an area occupied by the device as a whole. Further, since the material is corrugated cardboard or foamed plastic, it has poor durability and must be discarded after use.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bushing protective cover for electric equipment which can be easily attached to and detached from a bushing and which can be reused.

[0005]

To achieve the above object, in the first aspect of the present invention, a cylindrical body is attached to a bushing in a protective cover that is attached to and surrounds each bushing projecting from an electric device. It is characterized in that an elastic support portion, which is elastically supported by the bushing, is provided so as to project inside the cylindrical body by being locked with a detachable stopper.

A second invention is characterized in that, in the first invention, it is made of soft polyethylene.

[0007]

According to the first aspect of the invention, the bushing is attached to the bushing from the side thereof, and the elastic support portion formed on a part of the cylindrical body absorbs and relaxes the external force.

In the second aspect of the present invention, since it is a synthetic resin molded body, it retains its original shape as a cylindrical body even if it is removed from the bushing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1A shows a protective cover attached to a bushing of an electric device. As shown in the figure, the protective cover has a tubular shape with both ends open as a whole, and is configured to cover the porcelain bushing 2 and the mold cone portion 4.

FIG. 1B shows the protective cover before mounting. As shown in the figure, it is a semicircular cylinder divided into two parts, which is held by a bushing and mounted as shown in FIG. 1 (A). The cylindrical body 10 includes cylindrical pieces 10a and 10b.
And the tapered cone protection portions 15a, 1 formed on one end thereof
5b, and has a uniform thickness of about 3 mm. The cylindrical piece 10a and the cylindrical piece 10b are integrally connected by a hinge 11. This hinge 11
Is thinner than the cylindrical pieces 10a and 10b, and has elasticity against bending.

A stopper 12 is formed at the other joint. The stoppers 12 are provided at two positions in the axial direction, and the male side insertion piece 12a having the locking claw on the cylindrical piece 10a projects in the circumferential direction, and the female side receiving seat 12 having the insertion hole.
b is formed so as to project in the radial direction. Then, the insertion piece 12a and the receiving seat 12 are attached to the corresponding cylindrical piece 10b.
A receiving seat 12b and an insertion piece 12a are formed so as to face b. That is, the female side and the male side are provided alternately. When the joint of the cylindrical portion 10 is closed, the claws of the insertion piece 12a are hooked on the receiving seat 12b to form a cylindrical shape, and when the insertion piece is pushed, the insertion piece has a proper elasticity and can be easily removed.

Next, the elastic support structure for the bushing will be described with reference to FIGS. 1 (B) and 1 (C). Cylindrical piece 1
Two elastic support portions 14 are formed at intervals in the axial direction of 0a. Each of the elastic support portions 14 has a cylindrical piece 10
A band-shaped portion is formed by two slits provided at a predetermined interval in the circumferential direction of a, and the band-shaped portion is formed in a corrugated shape, and the corrugated peaks are configured to protrude inside the cylinder. Furthermore, the band-shaped portion is thinner than the cylindrical piece 10a,
It is easily elastically deformed.

Inside the cylindrical piece 10b, three fin-shaped thin bands are formed in the axial direction along the circumferential direction,
The elastic support portion 13 is configured. At the base of the cone protection portion 15 of the cylindrical portion 10, holes 16 are provided at four locations on the circumference. This is drainage when rainwater enters.

In this protective cover, all parts are integrally injection-molded using soft polyethylene. According to this material, the cylindrical portion forming the outer shell is lightweight and has sufficient rigidity as a protector, and when the thin portion is formed, that portion is easily elastically deformed.

Next, the operation will be described. When the protective cover is applied to each bushing of the electric device and closed, the elastic support portions 13 and 14 formed in the cylindrical portion abut the insulator portion of the bushing. When it is further closed and the anti-slip device 12 is engaged, it becomes a tubular body, and it is attached with proper elasticity and one-touch to the bushing. When a large number of transformers equipped with these protective covers are mounted on a vehicle and transported, the bushings protruding from the side surface of the transformer tank are protected by the protective cover even if a slight impact force is applied, and the elastic support portions 13, 14
Damped by elastic deformation of. Also, when a large number of transformers are installed in vehicles or stored in a warehouse, if a cushioning sheet material is inserted between the transformers to protect them, the corners of the protective cover are cone-shaped, so the chamfered corners are chamfered. As with, soften impact force and make it easier to insert sheet material. Furthermore, since this protective cover is made of soft polyethylene, it can be used many times by removing the used one without being consumed.

Another embodiment will be described. In the above-mentioned embodiment, the tapered cone protection portion 15 is provided at one end of the cylindrical portion 10.
However, the entire length may be formed into a cylinder having the same diameter so that the cylindrical portion is extended without being tapered and covers the mold cone portion 4 of the bushing 1. Even with this configuration, the bushing protection function has the same effect as that of the above-described embodiment, and the molding die can be simplified.

Various positions of the elastic support structure with respect to the bushing can be considered. That is, the cylindrical piece 1
The corrugated elastic support portions 14 may be provided on both 0a and 10b, or the fin-shaped elastic support portions 13 may be provided on both of them.

Further, the cylindrical piece 10a and the cylindrical piece 10b may be formed separately, and the mating portions may be engaged by two stoppers 12 on each side. According to this structure, especially the above-mentioned pair of cylindrical pieces 10a and 10b provided with the elastic supporting structure having the same shape can be manufactured by a molding die for molding a half-split cylindrical piece, so that the die can be downsized. .

As for the structure of the stopper, as shown in FIG. 2, a stopper hole 18 is formed at the seam edge of the cylindrical piece 10b, and a claw portion 12c is provided on the back side of the inserting piece 12a of the cylindrical piece 10a. When protruding and closing, claw portion 12c
You may make it fit in the stop hole 17.

[0020]

As described above in detail, according to the first aspect of the present invention, the bushing can be easily attached and detached from the side, and a part of the cylindrical body effectively supports elastically.

According to the second aspect of the present invention, it is possible to remove the electric apparatus from the electric apparatus and reuse it, which has an effect of saving resources.

[Brief description of drawings]

FIG. 1A is a perspective view showing an example in which a bushing protective cover of an electric device of the present invention is attached to a bushing,
(B) is a perspective view showing an example of the protective cover, (C)
FIG. 6 is a cross-sectional view showing an example of an elastic support portion of a protective cover.

FIG. 2 is a perspective view showing an example of a stopper of a bushing protection cover of an electric device according to the present invention.

FIG. 3 is a side view showing a state where a general bushing is attached to a side wall of a tank.

FIG. 4 is a front view showing an example in which a conventional bushing protection cover is attached to a bushing.

FIG. 5 is a front view showing another example in which a conventional bushing protection cover is attached to a bushing.

[Explanation of symbols]

 10 Cylindrical body 11 Hinge part 12 Stopper 13 Elastic support part 14 Elastic support part 15 Cone protection part 16 Hole 17 Stop hole

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Fumiyasu Etsuka 1440 Nakakuki, Oyama City, Tochigi Prefecture Takayama Works Oyama Plant (72) Inventor Shin Uchida 1-3-3 Uchisaiwai, Chiyoda-ku, Tokyo Within Kyodensha Co., Ltd. (72) Inventor Issho Mochizuki 1-3-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Tokyodenki Co., Ltd. (72) Inventor Dai Matsui 1994 Takahashibamachi, Numata City, Gunma Prefecture Matsuhiro Matsuhiro Inc. Within

Claims (2)

[Claims] 1. A protective cover that is attached to and surrounds each bushing projecting from an electric device, comprising: a cylindrical body that is held by the bushing and is held by a removable stopper; and a cylindrical body inside the cylindrical body. A bushing protective cover for an electric device, comprising: an elastic support portion that is provided so as to elastically support a cylindrical body on the bushing. 2. The method according to claim 1, which is formed of soft polyethylene.
Bushing protective cover for the electrical equipment described.