JPH09330825A - Tank for oil-immersed device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reliable tank for an oil-immersed device without causing deterioration in reduction of size and weight of the tank. SOLUTION: A tank for an oil-immersed device is made by forming a single sheet of thin plate into a corrugated plate, drawing and air-tightly welding both ends of the corrugated plate to from a corrugated heat radiating plate 2 having a plurality of heat radiating fins 1, overlapping an upper frame member 3 and a lower frame member with inside faces of both ends of the heat radiating plate 2, and then welding the plate and members. An oil-immersed device and insulating oil are accommodated within an interior of the tank. In this case, when the inside and outside of the overlapped portions are welded, an outer weld bead 14 and an inner weld bead 15 are linked together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tank for oil-filled equipment.

[0002]

2. Description of the Related Art In recent years, in order to prevent the deterioration of oil in oil-filled equipment, for example, distribution transformers, closed-type ones are more often used than open-type ones. The structure of a conventional tank of a closed type distribution transformer is shown in FIGS. 12 to 17. That is, in the tank, the upper frame 3 is welded to the upper end of the corrugated heat dissipation plate 2 having a substantially rectangular shape with four corners forming an arc and having a large number of heat dissipation fins 1 on the outer periphery, and the bottom end is welded. The lower frame body 4 is constructed by welding, and a transformer main body (not shown) and insulating oil so as to immerse the transformer main body are housed inside. And with the operation of the transformer body,
Insulation oil is circulated in the radiation fins 1 by convection to radiate heat. In addition, the suspension fittings used when installing the tank are generally attached to the upper frame, and the effects on the lid and bottom attached to the ends of the upper and lower frames are generally reduced. The plate thickness of the upper frame 3 and the lower frame 4 is larger than that of the corrugated heat dissipation plate 2.

[0003]

FIG. 13 shows a corrugated heat dissipation plate 2
The outline of the upper frame 3 before overlay welding is shown. Further, FIG. 14 shows an outline of the corrugated heat dissipation plate 2 and the upper frame body 3 after lap welding. Although FIG. 13 and FIG. 14 show the overlapping of the upper frame body 3, the same applies to the lower frame body 4. As shown in FIG. 13, the corrugated heat dissipation plate 2 is formed by forming the heat dissipation fin 1 in a wave shape from a thin plate, and then drawing and welding the end 5 of the heat dissipation fin. Then, the upper frame body 3 is welded to the inside of the end portion 6 of the corrugated heat dissipation plate 2 over the entire outer periphery of the overlapping portion. FIG. 15 is a of FIG.
-B shows a vertical sectional view. In addition, FIG. 16 shows cd of FIG.
A vertical sectional view is shown. Although there is no gap S between the corrugated heat dissipation plate 2 and the upper frame 3 in the ab vertical cross section of FIG. 15, in the vertical cross section of cd of FIG. Since there is a gap S, there is a gap S.
Further, the root 9 of the radiating fin end welded portion 8 has a small cross section and low rigidity.

When the temperature of the transformer body rises due to operation,
The pressure in the tank rises, and the corrugated heat dissipation plate 2 deforms so as to bulge outward as indicated by the alternate long and short dash line 10 in FIG. Also,
If the pressure in the tank drops, the chain double-dashed line 11 in FIG.
The corrugated heat dissipation plate 2 is deformed so as to contract inward. By repeating these deformations, the root 9 of the radiating fin end welded portion 8 is bent and fatigued. In this case, since the base of the welded end of the radiation fin at the center of the long side of the tank is the weakest in terms of strength, this part is fatigue-damaged and the insulating oil in the tank leaks to the outside. Therefore, an object of the present invention is to provide a highly reliable tank for oil-filled equipment without impairing the reduction in size and weight of the tank.

[0005]

A tank of an oil-filled device according to claim 1, wherein a thin plate is formed in a wave shape, and both ends thereof are drawn and welded airtightly. Welding the outer and inner sides of the superposed part in a tank that contains the oil-immersed device main body and insulating oil inside by superposing and welding the upper frame and the lower frame on the inside of the heat sink and its both ends. According to, the welding bead from the outside and the welding bead from the inside are connected. According to the tank of the oil-filled device according to claim 1, by welding the outer side and the inner side of the overlapping portion of the corrugated heat dissipation plate and the upper frame body and the corrugated heat dissipation plate and the lower frame body, the welding bead and the inner side from the outer side are welded. By connecting the welding beads from, it is possible to increase the cross-section of the base of the radiating fin end weld.
The rigidity can be improved. Also, by welding from the inside, the cross section of the root of the radiating fin end welded part becomes smooth, and the flow path of insulating oil circulating in the radiating fin is not obstructed, cooling performance is improved, and the tank pressure rises. The deformation of the corrugated heat dissipation plate can be suppressed and reduced.

In the tank of the oil-filled equipment according to the second aspect of the present invention, the corrugated heat dissipation plate and the upper frame body and the corrugated heat dissipation plate and the lower frame body are welded only to the outside of the overlapping portion and the central portion of the tank long side of the overlapping portion. Thus, the welding bead from the outside and the welding bead from the inside are connected. According to the tank of the oil-filled device according to claim 2, the outer side of the overlapping portion of the corrugated heat dissipation plate and the upper frame body, and the superposed portion of the corrugated heat dissipation plate and the lower frame body, and the central portion of the tank long side (the tank long side). Since the weld bead from the outside and the weld bead from the inside are connected by welding the inside of (1/2 or less of the length),
It is possible to increase the cross-section of the base of the welded end of the radiation fin at the center of the long side of the tank, and to improve the rigidity. Further, since the welding from the inside is required only in the central portion of the long side of the tank, the number of welding points is reduced, and the manufacturing cost can be reduced.

A tank of an oil-filled device according to a third aspect of the present invention is characterized in that an oil-resistant elastic body is inserted in the overlapping portion of the corrugated heat dissipation plate and the upper frame body and the corrugated heat dissipation plate and the lower frame body. According to the tank of the oil-filled device according to claim 3, since the oil-resistant elastic body is inserted in the overlapping portion of the corrugated heat dissipation plate and the upper frame body and the corrugated heat dissipation plate and the lower frame body, the pressure in the tank is reduced. When the heat sink is lowered, it is possible to suppress the inward bending deformation at the base of the radiating fin end welded portion. In addition, the cross section of the root of the welded end of the heat radiation fin is smooth, and the flow path of insulating oil circulating inside the heat radiation fin is not obstructed, improving the cooling performance and suppressing the rise in tank pressure. The deformation of the heat sink can be reduced.

A tank of an oil-filled device according to a fourth aspect of the present invention inserts a thin metal piece, for example, a soluble metal, which is welded by lap welding to an overlapping portion of a corrugated heat dissipation plate and an upper frame, and a corrugated heat dissipation plate and a lower frame. It is characterized by doing. According to the tank of the oil-filled device according to claim 4, a thin metal plate, for example, a soluble metal, which is welded by lap welding is inserted in the overlapping portion of the corrugated heat dissipation plate and the upper frame, and the corrugated heat dissipation plate and the lower frame. Therefore, it is possible to increase the cross-section of the base of the heat radiation fin end welded portion and improve the rigidity. In addition, the cross section of the base of the heat radiation fin end weld is smooth, and the flow of insulating oil circulating in the heat radiation fin is not obstructed, improving cooling performance, suppressing the rise in tank pressure, The deformation of the heat sink can be reduced.

In a tank of an oil-filled device according to a fifth aspect of the present invention, one thin plate is formed in a corrugated shape so that portions where both ends of the thin plate are processed into a rectangular shape correspond to peaks, and both ends of the peaks are drawn. Having a plurality of heat dissipation fins that are welded in an airtight manner, weld the part where the rectangular processed parts of the valleys are abutted to form a corrugated heat dissipation plate, and configure the tank side member with only the corrugated heat dissipation plate Is characterized by. According to the tank of the oil-filled equipment according to claim 5, since the upper frame and the lower frame are omitted and the tank side member is composed of only the corrugated heat dissipation plate, there is a gap at the root of the heat dissipation fin end welded portion. It can be eliminated and the bending of the relevant part can be reduced. Further, since the corrugated heat dissipation plate and the upper frame body and the corrugated heat dissipation plate and the lower frame body do not have to be superposed and welded, the shape discontinuity is eliminated, and the rigidity of the side plate can be made uniform.

A tank of an oil-filled device according to a sixth aspect of the present invention is characterized in that the tank side member is composed of only a corrugated heat dissipation plate, and the upper and lower parts of the corrugated heat dissipation plate are drawn. According to the tank of the oil-filled equipment according to claim 6, since the upper frame and the lower frame are omitted and the tank side member is composed of only the corrugated heat dissipation plate, there is no gap at the root of the heat dissipation fin end welded portion. The bending of the relevant part can be reduced. Further, since the upper and lower parts of the corrugated heat dissipation plate are drawn, deformation can be suppressed and the influence on the lid and bottom attached to the upper and lower ends of the corrugated heat dissipation plate can be reduced.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.
This will be described with reference to the drawings. A first embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 shows an outline of the corrugated heat dissipation plate 2 and the upper frame body 3 after lap welding. Further, FIG. 2 shows an outline of the corrugated heat dissipation plate 2 and the upper frame body 3 before lap welding. 1 and 2 show the superposition of the upper frame body 3, the same applies to the lower frame body 4. The corrugated heat dissipation plate 2 is formed by forming the heat dissipation fin 1 in a wave shape as shown in FIG. 2 and then drawing the end of the heat dissipation fin 5 and hermetically welding it. And this corrugated heat sink 2
Inside the end 6 of the outer side of the overlapping portion of the upper frame 3
2 and the inner side 13 are welded all around. At this time, as shown in FIG. 3 which is a vertical sectional view taken along the line ef of FIG. 1, the welding bead 14 from the outside and the welding bead 15 from the inside are welded to be connected. The welding from the inside in the overlapping portion may be performed only at the intersecting portion of the end portion 16 of the upper frame 3 and the portion 17 where the heat radiation fin of the corrugated heat radiation plate rises.

Next, the operation of the above configuration will be described. When the temperature of the transformer main body rises due to the operation, this heat is transferred to the insulating oil, and the insulating oil is cooled through the radiator fins 1 and then circulated back into the tank to cool the transformer main body. . When the temperature of the insulating oil rises, the pressure inside the tank rises, and the corrugated heat dissipation plate 2 deforms so as to bulge outward as indicated by the alternate long and short dash line 10 in FIG. Further, when the pressure in the tank is lowered, the corrugated heat dissipation plate 2 is deformed so as to contract inward as indicated by a chain double-dashed line 11 in FIG. By repeating this deformation, bending acts on the root 9 of the radiating fin end welded portion 8. According to the configuration of the present invention, the corrugated heat dissipation plate 2 and the upper frame 3
By welding the outer side and the inner side of the overlapping portion of and connecting the weld bead 14 from the outer side and the weld bead 15 from the inner side, it is possible to increase the cross section of the root 9 of the radiating fin end welded portion 8. The part has sufficient strength against bending load. Further, by welding from the inside, the cross section of the root 9 of the heat radiation fin end welded portion 8 becomes smooth, and the passage of the insulating oil circulating in the heat radiation fin 1 is not obstructed, so that the cooling performance is improved and the tank The rise in internal pressure is suppressed, and the deformation of the corrugated heat dissipation plate 2 can be reduced.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 5 shows a schematic front view of the corrugated heat dissipation plate 2 and the upper frame 3 on the long side of the tank after lap welding. The outline of the corrugated heat dissipation plate 2 and the upper frame 3 before the lap welding is similar to that shown in FIG.
Radiating fins 1 at the overlapping part in the center of the long side of the tank
The vertical cross-sectional view of the rising portion is similar to that shown in FIG. Although FIG. 5 shows the superposition of the upper frame body 3, the same applies to the lower frame body 4. The corrugated heat dissipation plate 2 is formed by forming the heat dissipation fin 1 in a wave shape as shown in FIG. 2 and then drawing the end of the heat dissipation fin 5 and hermetically welding it. And this corrugated heat sink 2
The upper frame 3 is placed inside the end 6 of the
2 all around and the central part of the long side of the tank (1 of the long side of the tank)
Weld on the inner side 18 of the overlapped portion of (1/2 or less). At this time, as shown in FIG. 3, the welding bead 14 from the outside and the welding bead 15 from the inside are welded to be connected. Welding from the inside at the central portion of the long side of the overlapping portion may be performed only at the intersecting portion of the end portion 16 of the upper frame 3 and the portion 17 where the heat radiation fin of the corrugated heat radiation plate rises.

With this structure, the heat radiation fin end welded portion 8 is formed.
It is possible to increase the cross-section of the root 9 of the, and the portion has sufficient strength against bending load. In addition, since the welding from the inside is required only in the central portion of the long side of the tank, the number of welding points is reduced, and the manufacturing cost can be reduced.

Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a vertical cross-sectional view of a portion where the heat radiation fin 1 rises in the overlapping portion of the corrugated heat radiation plate 2 and the upper frame body 3. The outline of the corrugated heat dissipation plate 2 and the upper frame 3 before the lap welding is the same as that shown in FIG. Although FIG. 6 shows the superposition of the upper frame body 3, the same applies to the lower frame body 4. Inside the end portion 6 of the corrugated heat dissipation plate 2 having a plurality of heat dissipation fins 1, the upper frame 3 is welded over the entire circumference at the outer side 12 of the overlapping portion, and the oil resistant elastic body 19 is inserted from the inside. The oil-resistant elastic body 19 may be inserted over the entire inner circumference of the overlapping portion, or may be only at the intersecting portion of the end portion 16 of the upper frame body 3 and the rising portion 17 of the radiating fin 1 of the corrugated radiating plate. In addition, a portion where the oil-resistant elastic body 19 is overlapped with the upper frame body 3 of the corrugated heat dissipation plate 2 before superposition welding.
Alternatively, it may be provided in a portion of the upper frame body 3 that is overlapped with the corrugated heat dissipation plate 2, and may be deformed when the corrugated heat dissipation plate 2 and the upper frame body 3 are superposed.

With this configuration, when the pressure in the tank is lowered, it is possible to suppress the inward bending deformation at the root 9 of the radiating fin end welded portion 8. In addition, since the cross section of the root 9 of the radiating fin end welded portion 8 becomes smooth and the flow path of the insulating oil circulating in the radiating fin is not obstructed, the cooling performance is improved, and the rise in tank pressure is suppressed. Therefore, the deformation of the corrugated heat sink 2 can be reduced.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. 7 and 8. FIG. 7 shows an outline of the corrugated heat dissipation plate 2 and the upper frame 3 before lap welding. FIG. 8 shows a vertical sectional view of a portion where the heat radiation fin 1 rises in the overlapping portion of the corrugated heat radiation plate 2 and the upper frame body 3. Although FIG. 7 and FIG. 8 show the superposition of the upper frame body 3, the same applies to the lower frame body 4. A metal thin piece 20, for example, a soluble metal, which is welded by superposition welding is inserted between the corrugated heat radiating plate 2 having the plurality of heat radiating fins 1 and the upper frame 3 which is bound,
Weld all around the outer side 12 of the overlapping portion. The thin metal piece 20 may be inserted over the entire circumference of the overlapped portion, or the central portion of the long side of the tank (1/2 or less of the length of the long side of the tank).
It may be inserted only in the overlapping portion of. 20 more metal flakes
Is an end portion 16 of the upper frame 3 and a portion 17 where the heat radiation fins of the corrugated heat radiation plate stand up in the entire circumference of the overlapping portion or in the overlapping portion of the tank long side central portion (1/2 of the tank long side length). You may insert only the intersecting part.

With this structure, the weld metal 21 of the thin metal piece 20 enlarges the cross section of the root 9 of the radiating fin end portion welded portion 8, so that the rigidity of the portion can be improved. In addition, since the cross section of the root 9 of the radiating fin end welded portion 8 becomes smooth and the cooling performance is improved, the rise in the tank internal pressure is suppressed and the deformation of the corrugated radiating plate 2 can be reduced.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. 9 and 10. FIG. 9 shows the corrugated heat sink 2
The outline before welding of is shown. Moreover, FIG.
The following shows the outline after welding. 9 and 10 show the superposition of the upper frame body 3, the same applies to the lower frame body 4. As shown in FIG. 9, the corrugated heat dissipation plate 2 has wave-shaped heat dissipation fins 1 so that the portions 22 formed by cutting off both ends of the thin plate in a rectangular shape correspond to the peaks, and as shown in FIG. Is drawn and welded in an airtight manner, and then a portion of the valley portion cut off into a rectangular shape is welded to the end portion 23. When welding the portion where the end portion 23 of the portion cut off into a rectangular shape of the valley portion is abutted, a backing metal may be applied from the inside for welding in order to obtain a smooth shape.

Since the upper frame body and the lower frame body are omitted by this welding and the tank side surface member is composed of only the corrugated heat dissipation plate 2, there is no gap at the root of the heat dissipation fin end welded part, and bending deformation of the part is eliminated. It can be reduced. Further, since it is not necessary to perform lap welding of the corrugated heat dissipation plate 2 and the upper frame body, and the corrugated heat dissipation plate 2, the lower frame body 2 and the lower frame body, the shape discontinuity is eliminated and the rigidity can be made uniform. it can.

Finally, regarding the sixth embodiment of the present invention,
This will be described with reference to FIG. FIG. 11 shows an outline after the formation of the corrugated heat dissipation plate 2. Although FIG. 11 shows the superposition of the upper frame body 3, the same applies to the lower frame body 4. The outline of the corrugated heat dissipation plate 2 is as shown in FIG. As shown in FIG. 9, the corrugated heat dissipation plate 2 has a wave-shaped heat dissipation fin 1 formed by cutting off both ends of the thin plate in a rectangular shape so as to correspond to peaks, and as shown in FIG. Is drawn and welded airtightly, and after welding the part where the ends 23 of the part of the valley cut off into a rectangular shape are abutted, the upper part and the lower part are drawn.

With this configuration, the upper frame and the lower frame are omitted, and the tank side surface member is composed of only the corrugated heat dissipation plate 2. Therefore, there is no gap at the root 9 of the heat dissipation fin end welded part 8, and the part of the part concerned is eliminated. The deformation can be reduced. Further, since the upper and lower parts of the corrugated heat dissipation plate 2 are drawn, deformation can be suppressed and the influence on the lid and bottom attached to the upper and lower ends of the corrugated heat dissipation plate can be reduced.

[0023]

As is apparent from the above description, the present invention can obtain the following effects. As mentioned above,
The tank of the oil-filled device of the present invention has the following effects. According to the tank of the first oil-filled device of the present invention, by welding the outer side and the inner side of the overlapping portion of the corrugated heat sink and the upper frame body and the corrugated heat sink plate and the lower frame body, the welding bead and the inner side from the outer side are welded. By connecting the welding beads from, it is possible to improve the rigidity of the base of the heat radiation fin end weld, and by welding from the inside, the cross section of the base of the heat radiation fin end weld becomes smooth and cooling is possible. Since the performance is improved and the deformation of the corrugated heat dissipation plate can be reduced, it is possible to prevent the insulating oil in the tank from leaking to the outside by suppressing the destruction of the base of the welded end of the heat dissipation fin.

According to the tank of the second oil-filled device of the present invention, the corrugated heat dissipation plate and the upper frame body, and the corrugated heat dissipation plate and the lower frame body are disposed outside the overlapping portion and in the central portion of the tank long side of the overlapping portion. Since the weld bead from the outside and the weld bead from the inside are connected by welding the inside, the rigidity of the weld fin at the end of the heat dissipating fin at the center of the long side of the tank can be improved. This has the effect of suppressing the destruction of the root of the welded portion and preventing the insulating oil in the tank from leaking to the outside. Also, since the welding from the inside is only at the center of the long side of the tank, the number of welding points is reduced, which has the effect of reducing manufacturing costs.

According to the third tank for oil-filled equipment of the present invention, the heat radiation fins are inserted by inserting the oil resistant elastic body in the overlapping portion of the corrugated heat dissipation plate and the upper frame body and the corrugated heat dissipation plate and the lower frame body. It is possible to suppress bending deformation of the end welded part toward the inside of the root, and to improve the cooling performance by smoothing the cross section of the base of the heat dissipation fin end welded part, and to reduce the deformation of the corrugated heat sink. Therefore, it is possible to prevent the insulation oil in the tank from leaking to the outside by suppressing the destruction of the base of the heat radiation fin end welded portion.

According to the tank of the fourth oil-filled device of the present invention, a thin metal piece, for example, a soluble metal, which is welded by lap welding at the overlapping portion of the corrugated heat dissipation plate and the upper frame and the corrugated heat dissipation plate and the lower frame. By inserting the, it is possible to improve the rigidity of the root of the heat radiation fin end welded portion, and also the cross section of the root of the heat radiation fin end welded portion becomes smooth,
Since the cooling performance is improved and the deformation of the corrugated heat dissipation plate can be reduced, it is possible to prevent the insulating oil in the tank from leaking to the outside by suppressing the destruction of the base of the welded part of the heat dissipation fin.

According to the tank of the fifth oil-filled device of the present invention, the upper frame and the lower frame are omitted, and the tank side member is composed of only the corrugated heat dissipation plate. It is possible to reduce the bending deformation and eliminate the shape discontinuity of the tank side member,
Since the rigidity can be made uniform, there is an effect of suppressing the destruction of the base of the welded end of the heat radiation fin and preventing the insulating oil in the tank from leaking to the outside.

According to the sixth tank for oil-filled equipment of the present invention, the upper frame and the lower frame are omitted, and the tank side surface member is composed of only the corrugated heat dissipation plate. Since the gap is eliminated and the bending deformation can be reduced, it is possible to prevent the insulating oil in the tank from leaking to the outside by suppressing the destruction of the base of the welded portion of the radiating fin. Further, since the upper and lower parts of the corrugated heat dissipation plate are drawn, there is an effect that deformation is suppressed and the influence on the lid and the bottom body attached to the upper and lower ends of the corrugated heat dissipation plate is reduced.

[Brief description of drawings]

FIG. 1 is an enlarged view of a welded portion between a corrugated heat sink and an upper portion according to a first embodiment of the present invention.

FIG. 2 is a view showing a state before welding the corrugated heat dissipation plate and the upper frame body shown in FIG.

FIG. 3 is a vertical sectional view taken along the line ef in FIG.

FIG. 4 is a diagram showing how the corrugated heat dissipation plate is deformed in the first embodiment of the present invention.

FIG. 5 is a front view of the overlapping portion of the corrugated heat dissipation plate and the upper frame body in the second embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of the rising portion of the heat radiation fin in the overlapping portion of the corrugated heat radiation plate and the upper frame in the third embodiment of the invention.

FIG. 7 is an enlarged view of a corrugated heat dissipation plate and an upper frame body before welding in a fourth embodiment of the present invention.

FIG. 8 is a vertical cross-sectional view of the rising portion of the heat radiation fin in the mating portion of the corrugated heat radiation plate and the upper frame in the fifth embodiment of the invention.

FIG. 9 is an enlarged view of a corrugated heat sink according to a fifth embodiment of the present invention before welding.

FIG. 10 is an enlarged view of welding of the corrugated heat dissipation plate in the fifth embodiment of the present invention.

FIG. 11 is an enlarged view of the corrugated heat dissipation plate after welding in a sixth embodiment of the present invention.

FIG. 12 is an external view of a tank of a conventional oil-filled device.

FIG. 13 is an enlarged view of a conventional corrugated heat dissipation plate and an upper frame body before welding.

FIG. 14 is an enlarged view after welding the conventional corrugated heat dissipation plate and the upper frame body.

15 is a vertical sectional view taken along the line ab of FIG.

16 is a vertical sectional view taken along the line cd in FIG.

FIG. 17 is a modified view of a conventional corrugated heat sink.

[Explanation of symbols]

1 is a radiating fin, 2 is a corrugated radiating plate, 3 is an upper frame, 4 is a lower frame, 14 is a weld bead from the outside, 15 is a weld bead from the inside, 19 is an oil-resistant elastic body, and 20 is a metal. A thin piece, 22 denotes a rectangular cut-off portion at both ends of the thin plate, and 23 denotes an end portion of the thin plate having a rectangular cut-off portion.

Claims (6)

[Claims] 1. A corrugated heat radiating plate having a plurality of heat radiating fins formed by corrugating one thin plate, and drawing and welding both ends thereof hermetically, and a frame inside both end portions of the corrugated heat radiating plate. In the case where the body of the oil-impregnated device and the insulating oil are housed by superposing and welding the body, the outer side and the inner side of the overlapping portion of the end portion of the corrugated heat dissipation plate and the frame body are welded and A tank for oil-filled equipment, characterized by connecting a weld bead and a weld bead from the inside. 2. A corrugated heat dissipation plate having a plurality of heat dissipating fins formed by corrugating one thin plate and hermetically welding both ends thereof, and a frame inside both end parts of the corrugated heat dissipation plate. In the case where the body of the oil-immersed electric device and the insulating oil are housed by superposing and welding the bodies, the end of the corrugated heat dissipation plate and the outer side of the overlapping portion of the frame body and the long side of the tank of the overlapping portion A tank for oil-filled equipment, characterized in that the inside of the central part is welded and the weld bead from the outside and the weld bead from the inside are connected. 3. A corrugated heat dissipation plate having a plurality of heat dissipation fins formed by corrugating one thin plate, and drawing and welding both ends thereof hermetically, and a frame inside both ends of the corrugated heat dissipation plate. In a structure which is formed by overlapping and welding a body and stores an oil-immersed device main body and insulating oil inside, an oil-resistant elastic body is inserted in the overlapping portion of the corrugated heat dissipation plate and the frame body. Oil-filled equipment tank. 4. The oil-filled device according to claim 1, wherein a thin metal piece that is welded by lap welding, for example, a soluble metal is inserted in the overlapping portion of the corrugated heat dissipation plate and the frame body. tank. 5. A plurality of rectangular cuts are made at both ends of one thin plate, and one thin plate is formed in a wave shape so that the cuts have peaks, and both ends of the peaks are drawn. It has a plurality of heat dissipation fins that are airtightly welded together, and the corrugated heat dissipation plate is formed by welding the parts where the rectangular processed parts of the valleys are abutted, and the tank side member is composed of only the corrugated heat dissipation plate. Characteristic oil-filled equipment tank. 6. The tank of the oil-filled device according to claim 5, wherein the upper and lower portions of the corrugated heat dissipation plate are drawn.