JPH0442890Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a bushing protection cover that protects the bushings during transportation of a pole-mounted transformer.

[Prior art] The tank, cover, and many of the externally facing accessories of a pole-mounted transformer are made of iron and will not be easily damaged even if external forces are applied to them, but the bushings are made of porcelain and are therefore not easily damaged by external forces. relatively weak against Among the bushings, low-pressure bushings do not protrude much from the tank wall and are less susceptible to contact with other objects, so unless transport conditions are bad, there is no need to use a protective cover, but high-pressure bushings do not protrude much from the tank wall. Since it is easy for other objects to come into contact with the
(referred to as a protective cover) is used.

Conventionally, as the protective cover 1, a box-shaped one made of wood or cardboard with one side open as shown in FIG. 5 is attached to the bushing 2, and a band (not shown) is attached.
Some had a structure in which they were fixed by tightening them, and others had a structure in which a cylindrical foamed plastic material was fitted into the bushing 2 and fixed as shown in FIG.

[Problems to be solved] However, wooden box-shaped protective covers and cardboard protective covers are time-consuming and expensive to produce, and they must be secured with bands, which makes packaging work difficult. However, there were some problems that required a lot of work. Further, although the cylindrical protective cover made of foamed plastic is inexpensive to manufacture, it has the problem that it is too loose or too hard when attached to the bushing. This is because the bushing is made of porcelain, so it is inevitable that there will be some variation in the finished outer diameter, while the inner diameter of the cylindrical protective cover is constant and cannot be flexible. If it is too loose during installation, there is a risk that the protective cover will fall off due to vibration during transportation, and if it is too tight, it will take more time to install the protective cover.

An object of the present invention is to provide a bushing protection cover for a pole transformer that is inexpensive to manufacture, easy to attach to the bushing, and has no fear of falling off due to vibration or the like.

[Means for Solving the Problems] To explain the structure of the present invention to achieve the above object, the bushing protection cover of the pole transformer of the present invention has an inner diameter smaller than the outer diameter of the bushing to be attached. The bushing protective cover body is made of resilient foamed plastic and has a length longer than the length of the bushing projecting out of the tank, and a cut portion is provided in the axial direction of the bushing protective cover body.

[Function] This type of bushing protection cover has a cut section in the axial direction of the bushing protection cover body made of elastic foam plastic, so it is easy to insert when installing it on the bushing, and the inner diameter is smaller than that of the bushing. Since it has a small diameter, it can be attached to the bushing with an appropriate binding force and will not fall off due to vibrations during transportation.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings. 1 and 2 show a first embodiment of the present invention. The bushing protection cover 1 of this embodiment is made of elastic foamed plastic such as expanded polystyrene, and has an inner diameter slightly (for example, about several mm) smaller than the outer diameter of the bushing 2 to be attached. A bushing protective cover main body 1a having a length longer than the protruding length from the pole-mounted transformer tank 3, for example, by several tens of millimeters, for example, is provided with a cut portion 1b in the axial direction with a width of, for example, several millimeters in the circumferential direction. It has a well-designed structure. In this case, the bushing protective cover body 1
The wall thickness of a varies depending on the magnitude of the assumed external force, but is approximately 10 mm to several 10 mm. In this embodiment, the bushing 2 is attached to the vertical surface of the tank 3 via a packing 4. Such a bushing protection cover 1 is formed by, for example, a compression molding process using a mold.

When such a bushing protection cover 1 is attached to a bushing, it is inserted with the cut portion 1b facing downward until one end of the bushing protection cover main body 1a touches the wall surface of the pole-mounted transformer tank 3. As mentioned above, the inner diameter of the bushing protective cover body 1a is slightly smaller than the outer diameter of the bushing 2, so
The width of the cut portion 1b will widen a little when the bushing is attached, but this widening of the cut portion 1b makes it easier to attach the bushing to the bushing 2, and by applying an appropriate binding force,
This will prevent it from falling off due to vibrations during transportation.

External forces that are likely to be applied to the bushing during transportation or handling of a pole-mounted transformer are due to contact by other objects from horizontally or from above, or from falling of other objects from above. Other objects in the horizontal direction are often tank walls of adjacent transformers, hanger seats, etc., but these are considerably larger than the outer diameter of the bushing 2. Therefore, even if another object comes into contact with the bushing 2 from the axial direction, the other object will be received by the tip of the protective cover main body 1a.
10 or more mm from the tip of the protective cover body 1a
It is unlikely that another object will come into contact with the tip of the bushing 2 located within 10 mm. In addition, if other objects come into contact with the bushing 2 from the side or above, or if a tool or the like comes into contact with the bushing 2 by mistake, these objects will be caught by the protective cover body 1a, so they will not come into direct contact with the bushing 2. There isn't.

In addition, there are originally few chances for other objects to come into contact with the lower surface of the bushing 2, and even more so, there is a possibility that the other objects may enter the narrow cut portion 1b of the protective cover main body 1 and come into contact with the bushing 2. is almost impossible.

Therefore, although the bushing protection cover 1 of this embodiment does not cover the entire outer surface of the bushing 2,
In terms of protection against contact with other objects, it has almost the same function as covering the entire surface.
In addition, a cutout 1 is provided at the bottom of the protective cover body 1a.
If b is provided, the bushing 2 and the protective cover body 1
There is no chance of rainwater collecting between them.

Note that the cut portion 1b may be provided during compression molding, or may be provided by cutting after compression molding.

FIG. 3 shows a second embodiment of the present invention. The bushing protective cover 1 of this embodiment has an axial inner diameter of the hole 1c of the protective cover main body 1a, with the inner diameter of one end of the hole 1c being _φ1 and the inner diameter of the other end being _φ2 , and the inner diameter of the hole 1c in the axial direction is gradually changed. , the hole 1a is a tapered hole.

In this way, the same protective cover 1 can be used for bushings 2 having slightly different outer diameter specifications by changing the insertion direction of the protective cover 1. For example, salt-resistant bushings often have a slightly larger outer diameter than general-spec bushings, but even in this case, insert the salt-resistant bushing from the side with the larger inner diameter (φ ₁ side) of the protective cover 1, The same protective cover 1 can be used for specification bushings by inserting the protective cover 1 from the smaller inner diameter side ( _φ2 side).

Note that displaying the type and serial number of the pole-mounted transformer on the upper surface of the protective cover body 1a is much easier to see than on a tag.

FIG. 4 shows a third embodiment of the present invention. The bushing protective cover 1 of this embodiment has a flat portion 1d on the outer circumferential surface of the protective cover main body 1a on the opposite side from the cut portion 1b.

When the flat portion 1d is provided in this way, writing or stamping on the protective cover main body 1a can be easily performed by using the flat portion 1d.

[Effects of the invention] As described above, in the present invention, the cylindrical protective cover body made of elastic foamed plastic is provided with a cut section in the axial direction, so it is easy to attach it to the bushing, and it can be installed in an appropriate manner. It can be attached to the bushing using binding force and will not fall off due to vibrations during transportation. Furthermore, since it is made of foamed plastic, less materials are required, and it can be manufactured automatically by compression molding, etc., so manufacturing costs can be reduced.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are a longitudinal cross-sectional view of the first embodiment of the bushing protection cover according to the present invention with the bushing attached, and a front view as seen from the tip of the bushing;
Fig. 3 is a longitudinal sectional view of a second embodiment of the bushing protection cover according to the present invention, Fig. 4 is a front view of the third embodiment of the bushing protection cover according to the invention, and Fig. 5 is a conventional bushing protection cover. FIG. 6 is a partially cutaway front view of one example of a bushing attached state, and FIG. 6 is a front view of another example of a conventional bushing protection cover with a bushing attached. 1... Bushing protection cover, 1a... Bushing protection cover body, 1b... Cutout, 1c
... Hole, 1d... Flat part, 2... Butsing.

Claims (1)

[Claims for Utility Model Registration] (1) A bushing protection cover that is attached to a bushing of a pole-mounted transformer to protect the bushing, which has an inner diameter smaller than the outer diameter of the bushing, and has an outer tank length of the bushing. A bushing protective cover for a pole-mounted transformer, characterized in that a bushing protective cover body made of resilient foamed plastic having a longer length is provided with a cut portion in the axial direction. (2) The bushing for a pole-mounted transformer according to claim 1, wherein the axial hole of the bushing protective cover body is a tapered hole whose inner diameter changes in the axial direction. protective cover. (3) A bushing protection cover for a pole-mounted transformer according to claim 1 of the utility model registration claim, characterized in that a flat part is provided on the outer periphery of the bushing protection cover body on the opposite side to the cut part. .