JPS60202917A - Tank for oil immersed electrical apparatus - Google Patents

Abstract

PURPOSE:To fix a reinforcing rod firmly even when a corrugated radiator plate is thin by fastening the reinforcing rod connecting each corrugation crest in the corrugated radiator fin to bonding sections where corrugation crests are closed together. CONSTITUTION:The end edges of a corrugated radiator fin 2 separately manufactured to the edge of corrugated radiator-fin fitting holes 13 in a tank proper 11 are superposed, and joined through welding, thus constituting a tank 1. The corrugated radiator fin 2 has a plurality of rib-shaped corrugation crests 2a through continuous bending molding, reinforcing rods 6 are fixed to bonding sections 2b in the vicinity of the upper and lower ends of each corrugation crest, and several corrugation crest is connected, thus reinforcing the corrugated radiator fin.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a tank for oil-filled electrical equipment such as a transformer using a corrugated heat sink.

[Background of the invention]

Examples of tanks for oil-filled electrical equipment using conventional corrugated heat sinks include those shown in FIGS. 1 to 5, for example.

In FIG. 1, a tank 1 consists of a corrugated heat sink 2, an upper frame 3 to which a tank cover (not shown) is attached, and a lower frame 4 integrated with a bottom plate. 3 and the lower frame 4 by welding. As shown in Figs. 2 to 5, the corrugated heat sink 2
has a plurality of continuous rib-like wave crests 2a, and close contact portions 2b are formed near both the upper and lower ends of each wave crest by drawing, and the close contact portions 2b are formed by sealing each end edge 2c by welding. An oil channel 2d for circulating insulating oil 5 (FIG. 4) in the tank by convection is formed inside the wave ridge 2a except for the crest 2a. In order to increase the surface area of this corrugated heat sink 2, the wave crest height h is set larger than the oil channel width W, so that the wave crest 2a will not be deformed or damaged by bending force during transportation or use of the equipment. It needs to be reinforced.

Conventionally, as a reinforcing means, a reinforcing rod 6 such as a round bar is fixed to the tip 2e of the unclosed part of the wave crest 2a by welding, as shown in FIGS. 3 to 5, and two or more reinforcement rods are used. The wave ridges 2a on each side of the tank 1 were connected laterally with rods 6. Reference numeral 7 denotes a welding portion for fixing the reinforcing rod 6 and the wave crest tip portion 2e.

However, as a material for the corrugated heat dissipation plate 2, a thin steel plate with a thickness of about 1 to 2 layers is generally used to reduce the weight of the tank and to facilitate processing.
The plate thickness has become thinner than the original plate thickness due to elongation of the material during bending, so if the welding part 7 is deepened when the reinforcing rod 6 is fixed, the wave crest tip of the thin plate will become thinner. 2
There is a risk that the melt e will fall and create a hole, or a weld crack will occur in this area, causing oil leakage from the oil pipe 2d. For this reason, in the past, the mounting strength of the reinforcing rod 6 was limited, and a sufficient reinforcing effect of the wave ridges could not be obtained in some cases.

[Purpose of the invention]

The purpose of the present invention is to make the reinforcing rod mounting portion of the wave crests so that melt dripping and welding cracks are unlikely to occur, so that even when the thickness of the corrugated heat sink is made thinner, the reinforcing rods can be firmly fixed to each wave crest. To provide an oil-filled tank for electrical equipment that does not cause oil leakage due to damage to wave crests.

[Summary of the invention]

The present invention provides a tank for oil-filled electrical equipment in which at least a part of the tank body is constituted by a corrugated heat sink having a plurality of rib-shaped corrugations and each corrugation is connected via a reinforcing rod. It is characterized by being fixed to the tightly closed portions of each wave crest of the heat sink.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 6 to 15. However, parts corresponding to those in FIGS. 1 to 5 are denoted by the same reference numerals, and explanations thereof will be omitted.

FIGS. 6 to 8 are diagrams showing a part of the corrugated heat sink 2, tank upper frame 3, and reinforcement n6 in one embodiment of the present invention. Corrugated heat sink 2 made by continuous bending of thin steel plate
Both upper and lower ends of the rib-like wave crest 2a (only the upper end is shown in the figure)
A close-fitting portion 2b is provided in the vicinity along the entire length of the wave crest 2a in the height direction by drawing, and their edges 2G are sealed by welding to form an oil channel 2d inside the unclosed portion of the wave crest 2a. do. This point is similar to the conventional example shown in FIGS. 1 to 5, and in this embodiment, the corrugated heat sink 2 is welded to the tank upper frame 3 and lower tank frame (not shown) as part of the tank body. This constitutes an oil-filled electrical equipment tank 1.

Here, a reinforcing rod 6 connecting each wave crest 2a of the corrugated heat sink 2
is fixed to the top end 2f in the wave crest height direction of the above-mentioned 'm attachment part 2b provided near both the upper and lower ends (=J) of the wave crest 2a, unlike the conventional example.The fixing is done by arc welding etc., and 7 is the welding. As the reinforcing rod 6, in addition to the round rod shown in the figure, one with any cross-sectional shape such as a square rod or a rectangular rod can be used.If necessary to fix this reinforcement 41J6, the end of the contact portion 2b can be used. The width from the edge 2C should be longer than that of the Tathagata.

According to the above configuration, the close contact portion 2b is a portion where both side plates of the wave ridge 2a overlap and the plate thickness is substantially twice that of other portions, and the contact portion 2b is a portion where the plate thickness is substantially twice that of other portions, and the tip portion 2f is located away from the oil pipe 2d. Since welding will be performed with the reinforcing rod 6, even if the welding depth of the welding part 7 is deep, there is little worry that the welding at the tip 2f will drop or weld cracking will occur, and the reinforcing rod 6 can be strengthened. Can be fixed. As a result, each wave crest 2a of the corrugated heat sink 2 is firmly connected via the reinforcing rod 6, and the wave crest 2a is
Sufficient reinforcement can be provided to prevent deformation or damage.

Furthermore, in the past, it was difficult to repair the welded part 7 because the plate thickness of the wave crest tip 2e to which the reinforcing rod 6 was fixed was thin, but with the above structure, even if the reinforcing rod 6 was not completely fixed, Repairs can be easily made by re-welding.

Figures 9 to 12 are reinforcement jP! A modified example of the wave crest contact portion that fixes J6 is shown. In order to firmly fix the reinforcing rod 6, it is necessary to lengthen the five dimensions of the tip of the wave crest contact portion to a certain extent. In the embodiments shown in FIGS. 6 to 8, the boundary line 8 between the wave crest contact portion 2b and the oil pipe 2d is made parallel to the edge 2c, and Lt@ is the same from the base of the wave crest 2a to the tip 2f. Five dimensions may be changed between the root portion of 2a and the tip portion 2f.

In the example shown in Fig. 9, the wave crest contact portion 2 is constructed so that the 5 dimensions increase from the base of the wave crest 2a to the tip 2f'.
The example in Figure 1O, in which the boundary line 8' between b' and the oil pipe 2d is formed obliquely, is the same from the base of the wave crest 2a to the tip 2f.
The boundary line 8' between the wave crest contact part 2b' and the oil pipe 2d is formed into a streamline along the oil flow in the oil pipe 2d so that the 5 dimensions increase as the wave crest contact part 2b' increases. A reinforcing rod 6 is fixed to the tip portions 2f' and 2f'. 7' and 7'' are the welded parts.

As shown in FIG. 7, when the boundary line 8 between the wave crest contact portion 2b and the oil channel 2d is formed in the horizontal direction parallel to the wave crest edge 2c, the oil flow near the upper end of the oil channel 2d generally occurs due to convection. is shown by arrow 9 in the same figure, and corner 1 of the oil pipe
At 0, the oil flow is stagnant and the heat dissipation effect is low. Although not shown in the figure, a similar tendency occurs near the lower end of the oil pipe 2d.

As shown in Fig. 9 and Fig. 10, the wave crest contact portions 2b', 2
If the boundary lines 8' and 8' between the oil pipe 2d and the oil pipe 2d are formed diagonally or in a streamlined manner, the parts where the oil flow stagnates in the oil pipe as described above, that is, the parts that do not contribute to heat radiation by convection, can be eliminated. It almost disappears. Of course, there is also a heat dissipation effect by radiation in the wave crest contact parts 2b' and 2b# where oil does not flow.Therefore, the wave crest contact part where the reinforcing rod 6 is fixed without substantially impairing the heat radiation performance of the wave crest. The tip 2f' of
The five dimensions of 2f' can be made sufficiently large. Also,
In terms of heat dissipation performance, the smooth flow of oil in the vicinity of the upper and lower ends of the oil passage 2d results in a favorable result in that heat dissipation through oil convection is promoted.

In the above embodiment, the close contact portions 2b and 2b' of the upper and lower ends of the wave crest are
, 2b' is used to fix the reinforcing rod 6, but in some cases, the wave crest 2a may be fixed as shown in FIGS. 11 and 12.
A close contact portion 2b~ closed by drawing may be provided near the tip of the wave ridge between the upper and lower ends of , and a reinforcing rod 6 may be fixed to the tip 2f'' of this close contact portion 2b'', and 7'' is the welded portion. This embodiment is suitable for increasing the reinforcing effect by connecting each wave crest at the middle of the upper and lower ends when the wave crest 2a has a long dimension in the vertical direction.

FIGS. 13 to 15 show another example of the structure of a tank for oil-filled electrical equipment to which the present invention is applied. FIG. 13 is a diagram showing the completed state of the tank 1, and FIGS. 14 and 15 are diagrams showing the tank body 11 and the corrugated heat sink 2 separated. The tank body 11 has corrugated heat sink mounting holes 13 in the side plate 12 in advance.
At the same time, the upper and lower ends are bent to form a flange 14.1.
5 is formed, this side plate 12 is bent into a cylindrical shape, and both ends in the circumferential direction are joined by welding to form a shell part 16, and then a bottom plate 17 is joined to the lower flange 15 by welding. Overlap the edge of the corrugated heat sink 2 made separately on the edge of the corrugated heat sink mounting hole 13 of the tank body 11 made by
The tank 1 is constructed by joining by welding. A tank cover (not shown) is attached to the upper flange 14. According to this configuration, the corrugated heat sink 2 is attached to the highly rigid tank body 11 in which the upper and lower flanges 14 and 15 and the side plate 12 are integrated.
Since the corrugated heat sink 2 can be attached to a part of the tank body, the tank can be easily constructed without the need for a separate support.
Since it overlaps with No. 2 without a gap, there is an advantage that welding of the joint can be easily and reliably performed.

The corrugated heat dissipation plate 2 shown in FIGS. 13 and 15 also has a plurality of rib-like corrugations 2a formed by continuous bending, and each corrugation is connected by reinforcing rods 6 fixed to the close contact portions 2b near the upper and lower ends of each corrugation. It is reinforced. The manner in which the wave crest 2a and the reinforcing rod 6 are fixed is the same as shown in FIGS. 6 to 8, but it goes without saying that other configurations as shown in FIGS. 9 to 12 can be adopted as necessary. .

〔Effect of the invention〕

According to the present invention, since the reinforcing rods that connect the corrugated crests of the corrugated heat sink are fixed to the close contact portions of the corrugated crests, even when the thickness of the corrugated heat sink is made thinner, the welded portions of the corrugated crests with the reinforcing rods are melted. The reinforcing rod can be firmly fixed without falling. Thereby, the wave crests can be sufficiently reinforced to prevent deformation and damage of the wave crests, and a light and durable tank for oil-filled electrical equipment with corrugated ribs can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a tank for oil-filled electrical equipment using a conventional corrugated heat sink, Fig. 2 is a partial front view of the corrugated heat sink cut at the wave crest, and Fig. 3 is a corrugated heat sink of a conventional tank. , a perspective view showing a reinforcing rod and a part of the tank upper frame, FIG. 4 is a side view similarly cut at the wave crest, and FIG.
FIG. 6 is a plan view cut along line A, FIG. 6 is a perspective view showing a part of the corrugated heat sink, reinforcing rod, and tank upper frame in one embodiment of the present invention, and FIG. 7 is a side view similarly cut at the wave crest. , FIG. 8 is a cutaway plan view taken along line B-B in FIG. 7, and FIG.
10 is a perspective view showing a modified example of the wave crest contact portion, FIG. 11 is a partial side view showing another modified example of the wave crest contact portion, and FIG. 12 is taken along line C-C in FIG. 11. FIG. 13 is a perspective view showing another configuration example of a tank for oil-filled electrical equipment to which the present invention is applied, and FIGS. 14 and 15 are views showing the tank body and corrugated heat sink separated FIG. ■... Tank 2... Corrugated heat sink 2a... Ribbed wave ridges 2b, 2b', 2b', 2b-... Wave crest close contact portion 6.
... Reinforcement rod 7.7', 7", 7'... Adhering Department Patent Attorney Junnosuke Nakamura 21.6 Figure? 9 Figure 3 7 C21 t8 Heddle I Spear 10 Figure

Claims (1)

[Claims] At least a part of the tank body is constituted by a corrugated heat sink having a plurality of rib-shaped wave crests, each wave crest being connected via a reinforcing rod, in which the reinforcing rod is connected to each wave ridge of the corrugated heat sink. A tank for oil-filled electrical equipment, which is characterized by being firmly fixed to the contact part.