JPS6019128B2 - Tank for oil-filled electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a side plate that also serves as a rib-type radiator, which is formed by forming a thin steel plate into a corrugated shape, and pressing and fixing both ends of the projecting portion, and a side plate that is a flat plate. The present invention relates to a tank for oil-filled electrical equipment.

This type of tank is known to have a high degree of freedom in design and can be easily automated in its manufacturing process, and its structure is shown in FIGS. 1 to 4.

In Figs. 1 to 4, reference numeral 1 denotes a rectangular cylindrical upper frame having a flange portion la at the top. A cover (also not shown) is attached to the flange portion la via a packing (not shown). 2 is a U-shaped side plate without a heat sink.

3 is a rib type heat sink made by forming a thin steel plate into a corrugated shape as shown in Fig. 4. After forming into a corrugated shape, the upper and lower open ends are crushed and welded as shown in welded part 3b in Fig. 3. , holds insulating oil 5 inside.

4 is a lower frame provided with a bottom plate 4c.

The above components are such that the upper frame 1 and the rib type radiator 3 have a welded part lb, the upper frame 1 and the side plate 2 have a welded part lc, and the lower frame 4 has a welded part lc.
The rib type heat radiator 3 and the side plate 2 are welded at a welding part 4a, and the IJ rib type heat radiator 3 and the side plate 2 are welded at a welding part 3a. Since the rib type heat sink 3 has a corrugated shape, the section modulus is large and the strength is strong, and a thin steel plate material can be used, which is advantageous in terms of manufacturing equipment and economically.

On the other hand, the side plate 4 is a flat plate, and must be made of a thicker material than the rib-type radiator 3 in order to withstand internal and external pressures such as vacuum lubrication of equipment and internal pressure increases due to temperature rises. . Therefore, in the case of the conventional structure, '
1} The rib type heat sink 3 and the side plate 2 must be manufactured separately using materials with different thicknesses. If it were to be installed, it would be necessary to perform longitudinal joint welding at four welded parts 3a in all directions around the circumference in order to join the rib-type heatsink 3 and the side plate 2. This leads to disadvantages such as: [a] two different thicknesses of material are required, [b] longer welding length, and 'c] larger number of parts, making it difficult to improve product quality and economy. was desired.

Therefore, an object of the present invention is to provide a tank for oil-filled electrical equipment that requires as few parts as possible, requires a short welding length, has little welding distortion, is strong against force, is economical, and has excellent quality. There is a particular thing.

In order to achieve this object, the present invention consists of a side plate that also serves as a rib-type radiator and a side plate made of a flat plate, which are continuous and integrated from one thin steel plate, and a sloped side plate made of a flat plate. This is a tank for oil-filled electrical equipment characterized by having a reinforcing portion provided therein, and will be described in detail below with reference to the drawings. Figures 5 to 7 show an embodiment in which the present invention is applied to a tank in which two of the four outer circumferential sides facing each other are configured as rib-type radiators.

In FIGS. 5-7, the upper frame 1 and lower frame 4 are the same as those in FIGS. 1-2, and their explanation will be omitted.

Reference numeral 6 designates the side plate of the tank of the present invention, and its characteristic feature is that vertical joint welding is performed at only one vertical joint welding part 6a when viewed in the outer circumferential direction, so that it can be made into an integral cylinder from one thin steel plate. It lies in the structure of the body.

Among all four side surfaces, two opposing sides are configured as side plate portions 6d having a rib type radiator 6c, and the other two opposing sides are configured as a flat side plate portion 6b without a rib type radiator. ing. The flat plate-shaped side slope portion 6b has an X-shaped reinforcing portion 6e formed by press-molding and squeezing out a portion of a material. This reinforcing portion 6e may have various shapes other than the X-shape shown in the drawings, and a separately prepared reinforcing material may be fixed by welding or the like instead of press molding. The side plate 6 consisting of side plate parts 6b and 6d and the upper frame 1 are welded at the welding part 1b, and the side plate 6 and the lower frame are welded at the welding part 4a, thereby completing the tank.

Next, an example of the manufacturing process of the tank side plate according to the present invention will be explained with reference to FIGS. 8 and 9.

First, in the first step, a single thin steel plate is formed into a corrugated shape, and its upper and lower ends are crushed and welded to form a rib-type heat sink 6c that holds insulating oil as an insulation and cooling medium inside. The formed side plate portions 6d and the side plate portions 6b which are flat plates without any processing, that is, which do not form a rib type radiator, are integrally provided at two alternate locations.

Next, in a second step, a part of the plate-like sloped side surface portion 6b on which no radiator is formed is press-molded into a concave or convex shape to provide, for example, an X-shaped reinforcing portion 6e. Furthermore, in a third step, the three boundary portions 6f (see FIG. 9) between the side plate portions 6b and 6d are each bent by 90°. That is, the slanted side portion 6d is bent 900 degrees with the radiator 6c facing outward to form a rectangular tube. In the fourth and final step, the remaining unbent corners of the rectangular tube, that is, the front and rear ends of the side plate 6 are welded (welded portion 6a) to complete the side plate 6 formed into a rectangular tube. In addition, in this example, a case was explained in which a radiator is provided only on two opposing sides among all four sides, and no radiator is provided on the other two sides.
Other arrangements can also be manufactured integrally from the same material. In the above embodiment, a case has been described in which each side plate portion around the entire circumference is manufactured from one steel plate, but the present invention is not limited thereto.

For example, as shown in FIG. 10, a side plate 7 having only one flat side plate part 6b without a heat radiator and one side plate part 6d having a rib type heat radiator 6c is 9 at the boundary part 6f.
Bend it inward at 0° to form an L shape, then combine two side plates 7 bent into an L shape as shown in Figure 11, and weld vertically at two welded parts 7a to complete a rectangular tube. You can also do this.
After the rectangular tube is completed, the upper frame and the lower frame can be assembled together in the same manner as in the previous embodiment. The embodiment shown in Figs. 10 and 11 has the disadvantage that there are two longitudinal joint welds compared to the embodiments shown in Figs. It has the advantages of being able to be stocked, reducing the unit weight by half, and making it easy to transport parts. As described above, according to the present invention, the side plate portion with the rib type heat sink and the side plate portion without the rib type heat sink are manufactured from one thin steel plate, and the side plate portion with the rib type heat sink is manufactured from a single thin steel plate. Since the reinforcement part is provided on the side slope,
The longitudinal welded part of the tank is reduced to 1/2 or 1'4,
In addition, because the plate is a thin plate, the welding length of the technically difficult part is shortened, making it very easy to manufacture.

Therefore, oil leakage from the longitudinal joint welding part and distortion of the side plate due to the thermal effect of vertical joint welding are reduced, which improves the quality accordingly, and makes it possible to shorten the welding time and the time for testing leakage of the welded part, resulting in a low price. This can greatly contribute to achieving short delivery times. Furthermore, since the types of materials and the number of parts for the tank are reduced, the integrated manufacturing system and production management become easier, and it is possible to provide a tank for oil-filled electrical equipment that requires less cost and takes less time to manufacture.

[Brief Description of the Drawings] Figures 1 and 2 are a plan view and a front view of a conventional tank for oil-filled electrical equipment, Figure 3 is an enlarged sectional view taken along line A-A in Figure 1, and Figure 4 is an enlarged sectional view taken along line A-A in Figure 1. FIG. 2 is an enlarged sectional view taken along line B-B, and FIGS. 5, 6, and 7 are plan, front, and side views of an embodiment of a tank for oil-filled electrical equipment according to the present invention. , FIGS. 8 and 9 are an exploded front view and a bottom view showing the state of the side plate of the tank shown in FIGS. 5 to 7 before it is shaped into a cylinder shape,
FIG. 10 is a plan view of a tank side plate before being formed into a cylindrical shape, showing another embodiment of the present invention, and FIG. 11 is a plan view of a tank side plate shown in FIG. 10 that is combined to form a cylindrical shape. FIG. 1...Top frame, 4...Bottom frame, 6,7...
・・Side plate, 6b, 6d...Side plate part, 6c...
... Rib type radiator, 6e... Reinforcement part, 6a, 7a
・・・・・・Vertical joint welding part. Ken 18 Tsutomu 2 figures section 3 figures many figures 4 figures Tsutomu 5 figures leopard 6 figures many? Figure 8 and 9 Tsutomuzan (rare h)

Claims (1)

[Claims] 1. A tank for oil-filled electrical equipment that has a side plate that also serves as a rib-type radiator, which is formed by forming a thin steel plate into a corrugated shape, and pressing and fixing both ends of the overhanging part, and a side plate that is a flat plate,
The side plate that also serves as a rib type radiator and the side plate made of a flat plate are constructed as a continuous integral piece from one thin steel plate, and a reinforcing portion is provided in the side plate portion made of the flat plate. A tank for oil-filled electrical equipment.