JPS608418Y2 - Tanks for oil-filled electrical equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tank for rib-shaped oil-filled electrical equipment such as a transformer, which has a tank side plate and heat sink formed by bending a sheet-like thin steel plate into a corrugated shape.

Generally, in oil-filled electrical equipment, heat generated inside the equipment is radiated from the tank surface using insulating oil as a medium.

For this reason, the tanks of oil-filled electrical equipment are designed to enhance the heat dissipation effect.

One method is to use a rib-shaped tank in which a sheet-like thin steel plate is bent into a corrugated shape to form a tank, and the side plates of the tank also serve as heat sinks.

In this rib-shaped tank, when a cable duct is attached to the side of the tank, the conventional structure is generally as shown in FIGS. 1 and 2.

That is, the tank side plate is composed of a tank side plate 1 made of a corrugated heat dissipation plate and a flat tank side plate 2.A duct support seat 3 is fixed to the flat tank side plate 2 by welding or the like, and the duct support is fixed to the tank side plate 2. A cable duct 4 is fixed to the seat 3 with bolts or the like.

Here, the cable duct 4 is composed of a bottom part 5 provided with a cable penetration part, a door 6 for connection work and inspection, a ceiling plate 7, and side plates 8 and 9.

However, in such a cable duct structure, the duct support requires a large amount of material cost and manufacturing man-hours in manufacturing the seat 3 and the duct body, and the total welding length becomes very long.

In this type of cable duct, it is necessary to attach reinforcements 10 so that the cable duct has enough strength to withstand vibration acceleration during transportation.

Furthermore, the flat tank side plate 2 to which the cable duct is attached cannot be made into a corrugated heat sink, resulting in a reduced heat dissipation area.

In order to compensate for this, it is necessary to increase the depth of the waves in the wave-shaped heat sink in other parts, which has the disadvantage of increasing the external dimensions and creating dead space on both sides of the duct.

The present invention was developed with these points in mind, and it is possible to create a tank for oil-filled electrical equipment that is small, lightweight, easy to manufacture, and economical without increasing the depth of the waves in the corrugated heat sink. The purpose is to provide.

An embodiment of the present invention will be described below with reference to FIGS. 3 to 6.

FIG. 3 is a plan view of the tank of the oil-filled electrical equipment of the present invention, and FIG. 4 is a front view of FIG. 3.

In addition, Figures 5 and 6 are X-X lines in Figure 3 and 4 lines, respectively.
It is a sectional view along the YY line of a figure.

The oil-filled electrical equipment tank according to the present invention has three parts on the side of the tank.
A wave-shaped heat sink 11a forming a surface.

The corrugated heat sinks 11a and 1 facing each other among the 11b and llc
1C are each extended in the same direction beyond the required length as a tank side plate.

On the other hand, the remaining tank side plate provided at a position facing the wave-shaped heat sink 11b is constructed by bending a flat plate into a U-shape, and the flat plate portions 12a and 12b located on both sides are the wave-shaped heat sinks 11a and 11C, respectively. The corrugated heat sinks 11a, 1 are arranged so as to face the extended portion of the waveform at a predetermined interval, and so that the central flat plate portion 12C is located on the side of the corrugated heat sink 11b.
Place it between 10 and 10.

Then, the upper, lower and side ends of the flat plate parts 12a and 12b are bent and connected to the upper, lower and side ends of the wave-shaped heat sinks 11a and 11C, respectively, and the flat plate parts 12a and 12b are connected to the wave-shaped heat sinks 11a and llc. An overhanging oil chamber 13a, 1
3b is formed.

The overhanging oil chambers 13a, 13b thus formed are used as side plates of the cable duct, and the overhanging oil chambers 13a, 13
A cable duct is constructed by closing the upper part between b with a ceiling plate 14, the lower part with a bottom plate 15 having a cable penetration part, and the front part between the overhanging oil chambers 13a and 13b with a door 16.

Note that 17 is a bushing attached to the central flat plate portion 12c of the tank side plate, and is connected to a cable that passes through the bottom plate 15 of the cable duct and is drawn out.

With this configuration, compared to the conventional method of manufacturing the duct support seat and cable duct body separately from the tank side plate, the material cost and manufacturing man-hours can be greatly reduced.
It can be produced inexpensively and in a short time.

In addition, the total welding length is significantly reduced, and since part of the tank side plate forms a cable duct to withstand vibration and shock during transportation, there is no need to provide special reinforcement, further reducing manufacturing man-hours. It can be measured.

Furthermore, the heat dissipation area reduced by the cable duct is compensated for by the corrugated heat dissipation plate on the side of the cable duct (overhanging oil chamber), so there is no need to increase the depth of the corrugated heat dissipation plate in other parts. Moreover, compared to the conventional example, there is no dead space on the side of the cable duct, and the external dimensions of the equipment can be reduced, that is, the floor space can be reduced.

Further, other embodiments of the present invention will be described.

If the size of the tank is larger than the size of the required cable duct, as shown in FIG. A pair of extending overhanging oil chambers 23a, 23b are formed at a predetermined interval in the horizontal direction to form the side surfaces of the cable duct, and furthermore, the pair of overhanging oil chambers 23a, 23b are formed on the sides of the cable duct.
The opposite surface of each of the overhanging oil chambers 23a is constructed with a corrugated heat sink.

Overhanging oil chambers 24a and 24b, both sides of which are formed by corrugated heat sinks, are provided between 23b and the short side wave-shaped heat sink.

With this configuration, in addition to obtaining the same effects as in the above embodiment, the heat dissipation area can be further increased, and the external dimensions of the device can be further reduced with the same heat dissipation capacity.

Further, as shown in FIG. 8, if the ceiling plate 14 and the door 16 are constructed as one piece, the number of parts can be further reduced.

As described above, according to the present invention, it is possible to provide a tank for oil-filled electrical equipment that is small, lightweight, and easy to manufacture without increasing the depth of the waves of the corrugated heat sink.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a tank of a conventional oil-filled electrical device, FIG. 2 is a front view of FIG. 1, FIG. 3 is a plan view of a tank of an oil-filled electrical device according to the present invention, and FIG. Front view of Figure 3, No. 5
The figures are a sectional view taken along the line X-X in FIG. 3, FIG. 6 is a sectional view taken along the Y-Y line in FIG. 4, FIG. 7 is a plan view showing another embodiment of the invention, and FIG. The figure is a sectional view showing still another embodiment of the present invention. 11 a, 11 b, 11 c..."corrugated heat sink, 12 at 12 b, 12 c"" flat plate part,
13a, 13b= 23ay 23b... Overhang oil chamber, 14... Ceiling plate, 15... Bottom plate, 16... Door, 17... ...Bushing.

Claims (1)

[Scope of utility model registration request] In a tank in which three sides of the tank are made up of corrugated heat sinks and at least a part of the remaining side is made up of a flat tank side plate, the flat tank side plate is connected to the inside of the tank and is connected to the tank side plate. At least a pair of overhanging oil chambers extending in a right angle direction are formed at a predetermined interval in the horizontal direction, and opposite surfaces of the pair of overhanging oil chambers are constituted by corrugated heat sinks, and the above-mentioned pair of overhanging oil chambers A tank for oil-filled electrical equipment, characterized in that the upper, lower and front portions between the oil chambers are closed to form a cable duct.