JP2770700B2 - Heat dissipation tank for electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat radiating tank for electric equipment, and more particularly to a heat radiating tank for electric equipment capable of housing electric equipment such as a transformer and promoting heat radiation of the electric equipment. .

[0002]

2. Description of the Related Art FIG. 10 is an overall perspective view showing a conventional heat radiating tank for electric equipment, and is an example of a heat radiating tank for an oil-filled transformer using a corrugated heat radiating plate made of a thin steel sheet as a peripheral outer plate. . In the drawing, reference numeral 1 denotes a corrugated radiator plate formed by making a thin steel plate into a continuous corrugated shape, 2 denotes a protruding fold of each corrugated radiator plate 1, and 3 denotes an upper end edge of each corrugated radiator plate 1. Welded upper frame material with L-shaped cross section, 4
Is a lower frame member of a flat plate superimposed and welded to the lower edge of each corrugated heat sink 1, 5 is a flange located on the upper surface of the upper frame member 3, and 10 is a reinforcing rod welded to the tip of the protruding pleat 2. , Made of a steel material such as a round bar or a square bar, and connects the protruding pleats 2 to each other.

FIGS. 11 and 12 are side sectional views showing a main part of a conventional heat radiation tank for electric equipment. In the drawing, reference numeral 6 denotes a bottom plate for closing the lower opening of the lower frame member 4, and 7 a cover for closing the upper opening of the upper frame member 3, which is fixed to the flange 5 of the upper frame member 3 by bolting or welding. Have been.

FIG. 13 is an enlarged perspective view of a main part showing a conventional heat dissipation tank for electric equipment. In the figure, 8 is a weld bead for sealing the crushed portion 2a at both upper and lower edges of the protruding fold 2 of each corrugated heat sink 1, and 9 is the upper frame member 3 and the lower frame member 4.
5 is a weld bead of the overlapped portion of the corrugated heatsink 1 superimposed on the outer edge portion. Also, P1 in the figure
Indicates an internal pressure, and P2 indicates an external pressure.

Next, the operation of the above-described conventional heat radiating tank for electric equipment will be described. In sealed oil-immersed transformers, there is an oil head as the internal pressure applied to the tank, and the expansion of the insulating oil due to the temperature rise of the windings and iron core due to ambient temperature fluctuations and load fluctuations during loading, and The pressure in the tank increases due to the rise in the temperature of the gas chamber inside the tank, and as a result, the internal pressure acts on the tank.

[0006] Also, in a gas insulating transformer in which an insulating gas such as SF6 gas is sealed, the temperature of the insulating gas changes due to fluctuations in ambient temperature and load, and the internal pressure of the tank rises.
For example, when an internal pressure acts on the tank shown in FIG. 10, an internal pressure P1 having a magnitude proportional to the area thereof acts on each of the corrugated heat radiating plates 1, and this internal pressure P1 is applied to the corrugated radiating plate 1, the upper frame member 3, and the lower frame member 3. 4 and will be supported. As a result, the horizontal cross section of the corrugated heat sink 1 is as shown in FIG. FIG. 14 is a horizontal sectional view showing a corrugated radiator plate when receiving the internal pressure of a conventional radiator tank for electric equipment. Further, as shown by the dashed line in FIG. 11, the wavy heat sink 1 moves outward as a whole, and is pulled by this, the upper frame member 3 and the lower frame member 4 are also deformed. The amount increases.

When the load decreases and the temperature decreases, the pressure in the tank also decreases and returns to the original state as indicated by the solid line. By the way, usually, the upper frame member 3 and the lower frame member 4 are 4 to
A relatively thick steel plate of 9 mm, and the corrugated heat sink 1 has a thickness of 0.1 mm.
A thin steel plate having a thickness of 8 to 1.6 mm is used. The welding beads 8 at the upper and lower ends of the crushed portion 2a of the projecting pleat 2 and the welding beads 9 between the projecting pleat 2 and the upper frame member 3 and the lower frame member 4 are formed. Since the thickness of the protruding folds 2 is small, the weld thickness cannot be increased. Therefore, arrows a,
As shown by b and c, a large bending stress is generated in the weld beads 8 and 9, and a crack is generated in the A13 portion due to a weld crack, thereby causing leakage of the internal fluid. Also, when the internal pressure is reduced and the external pressure P2 is applied as shown in FIG. 12, the same disadvantage occurs, and the stress and displacement of the portion A12 increase, and a serious problem particularly occurs in the weld bead 9.

As a measure for preventing the above-mentioned problem, the wave-shaped heat sink 1
It is conceivable to increase the thickness of the sheet. However, in this case, the manufacturing equipment for the corrugated heat sink 1 becomes large,
In addition to the deterioration of the workability, the tank weight becomes heavy and the material cost becomes high.

As an improvement, Japanese Patent Laid-Open Publication No. Sho 53-3663
There is a technology described in Japanese Patent Publication No. 0. This publication discloses a heat dissipation tank for electric equipment as shown in FIGS. 15 and 16. 15 and 16 are enlarged cross-sectional views of a main part showing another conventional heat dissipation tank for electric equipment. In the figure, reference numeral 11 denotes an embossed rib formed on the upper frame member 3;
It is a reinforcing plate arranged in. That is, they are arranged side by side in the longitudinal direction of the upper frame member 3 on the inner side of the tank, that is, on the side opposite to the welding side of the corrugated heat sink 1. However, in this method, since the size of the tank opening becomes small, it becomes an obstacle to insert the contents of the transformer (not shown) including the iron core and the winding into the tank, and the size of the tank becomes unnecessarily large. Must be.

Further, as another improvement plan, Japanese Utility Model Application Laid-Open No. 56-6
There is a technique described in Japanese Patent Publication No. 1030. This publication discloses a heat dissipation tank for electric equipment as shown in FIGS. 17 and 18. FIG. 17 is a side sectional view showing still another conventional heat dissipation tank for electric equipment, and FIG. 18 is an enlarged sectional view of a main part showing the heat dissipation tank for electric equipment of FIG. In the figure, 13
Is a mounting seat welded to the upper frame member 3, 14 is a reinforcing beam mounted on the upper frame member 3 via the mounting seat 13, and 15 is a bolt that is screwed to the mounting seat 13 and fastens the reinforcing beam 14. . That is, in this electric equipment heat dissipation tank, the mounting seat 13 is welded to the upper frame member 3 and the lower frame member 4, and the reinforcing beam 14 is fixed by the bolt 15 or the like. Usually, in this type of tank structure, the contents of a transformer composed of an iron core or a wire are attached to the cover 7, and when inserting the contents of the transformer into the tank, the cover 7 is hung to suspend the contents. Lower and insert into the tank.

For this reason, after the contents are inserted below the position of the mounting seat 13, the reinforcing beams 1 are passed through the gap between the cover 7 and the flange 5 of the upper frame member 3 while the contents are suspended.
4 requires a work to attach, which involves difficult and dangerous work. In order to avoid this, only the contents of the transformer such as the iron core and the windings are put into the tank first, and they are fixed. After that, the reinforcing beam 14 is tightened with the bolt 15, and the cover 7 is attached to the tank. Need to be installed. But,
Such an operation is complicated and requires a lot of assembly time.

[0012] Japanese Patent Laid-Open No. 2-1329 relates to a conventional heat dissipation tank for electric equipment which has improved the above-mentioned disadvantages.
There is a technique described in JP-A-16. In this type of heat dissipation tank for electric equipment, a reinforcing material is vertically inserted between the protruding folds 2, and the reinforcing material is fixed to the upper frame material 3 and the lower frame material 4 by welding. Therefore, although the stress of the member with respect to the pressure fluctuation can be suppressed below the allowable value, there is another disadvantage as follows.

In order to pass the reinforcing material vertically between the protruding pleats 2, the pitch of the protruding pleats 2, which is usually 30 to 40 mm, must be approximately doubled. For this reason, the number of the protruding pleats 2 to be provided is reduced by the number of the reinforcing members, and the heat radiation area of the heat radiation tank is reduced by that much.
The heat dissipation tank needs to be large.

Further, the reinforcing material is formed from the upper frame member 3 to the lower frame member 4.
Since a long member and a thick material are used, the weight of the heat radiation tank increases, and the cost also increases. Furthermore, it is difficult to apply a coating to the contact portion between the reinforcing material and the corrugated heat radiator plate 1, and particularly when used as an outdoor device, rust easily occurs.

[0015]

In the conventional heat radiation tank for electric equipment as described above, the thickness of each member is increased in order to suppress the stress of the member to an allowable value or less against repeated pressure fluctuations. There was a need for measures such as For this reason, not only the material cost and the product weight are increased, but also the molding operation of the corrugated radiator plate is made difficult, and the production cost is increased.

Therefore, the present invention can suppress the increase in the material cost and the product weight, facilitate the forming work of the corrugated radiator plate, and improve the reliability of the welded portion between the upper and lower frame members and the corrugated radiator plate. It is an object of the present invention to provide a heat radiation tank for electric equipment capable of increasing the temperature.

[0017]

According to a first aspect of the present invention, there is provided a heat radiating tank for electric equipment, wherein a plurality of corrugated heat radiating plates are formed by shaping a thin steel plate into a corrugated shape, and crushing the upper and lower ends thereof and sealing the corrugated plate.
An upper frame material and a lower frame which are superimposed on the inner side surfaces of the upper end edge and the lower end edge of these corrugated heat sinks, and the outer surfaces of the overlapped portions are hermetically welded to upper and lower ends of each of the corrugated heat sinks. In a heat radiating tank for electrical equipment having a material, reinforcing plates are disposed at appropriate dimensional intervals at positions where the upper frame material and the lower frame material overlap with the bent valleys of the corrugated heat radiating plate.

According to a second aspect of the present invention, there is provided a heat radiation tank for electric equipment, wherein the upper frame material and the lower frame material have a substantially L-shaped cross section, and the upper frame material and the lower frame material are bent valleys of a corrugated heat radiation plate. The reinforcing plate is welded so that two sides of the reinforcing plate are in contact with the upper frame material and the lower frame material having a substantially L-shaped cross section at an appropriate dimensional interval at a position where they overlap with the portion.

According to a third aspect of the present invention, the height of the reinforcing plate welded to the upper frame material and the lower frame material is substantially the same as the height of the protruding fold of the corrugated heat radiating plate. One end of the plate is attached to the inside of the corrugated radiator plate from the upper and lower end surfaces of the corrugated radiator plate, and the reinforcing plate and a reinforcing rod for bridging the tip of the protruding fold of the corrugated radiator plate in the horizontal direction are welded.

According to a fourth aspect of the present invention, there is provided a heat radiating tank for electric equipment, wherein a plurality of corrugated radiating plates are formed by forming a thin steel sheet into a corrugated shape, and crushing the upper and lower ends thereof, and sealing the upper end edges of the corrugated radiating plates. A heat dissipation tank for electric equipment having an upper frame material and a lower frame material superposed on the inner surface of the lower portion and the lower edge portion, and the outer surfaces of the overlapping portions are hermetically welded to upper and lower ends of each of the corrugated heat radiation plates. In the above, the upper frame material and the lower frame material are formed of three sides, and the inner angles of the two sides are bent into a channel shape formed of obtuse angles, and the waveform radiating plate is disposed near a bending point of the upper frame material and the lower frame material. Are welded.

According to a fifth aspect of the present invention, there is provided a heat radiating tank for electric equipment, wherein a plurality of corrugated heat radiating plates are formed by forming a thin steel plate into a corrugated shape, crushing the upper and lower ends thereof, and sealing the corrugated radiating plates. A heat dissipation tank for electric equipment having an upper frame material and a lower frame material superposed on the inner surface of the lower portion and the lower edge portion, and the outer surfaces of the overlapping portions are hermetically welded to upper and lower ends of each of the corrugated heat radiation plates. In the above, the upper frame material and the lower frame material are bent into a substantially L-shape with a radius larger than the plate thickness, and the upper frame material and the lower frame material are welded with the corrugated heat sink near the end of the arc. is there.

[0022]

In the heat radiating tank for electric equipment according to the first aspect of the present invention, a reinforcing plate is welded at an appropriate dimensional interval to a position where the upper frame material and the lower frame material overlap the bent valleys of the corrugated heat radiating plate. Therefore, the rigidity of the upper frame material and the lower frame material is increased, and the displacement and stress of the upper frame material and the lower frame material can be suppressed to the allowable values or less even when internal and external pressures are applied.

In the heat dissipation tank for electric equipment according to the second aspect of the invention, the upper frame material and the lower frame material have a substantially L-shaped cross section, and the upper frame material and the lower frame material are bent valleys of the corrugated heat sink. The reinforcing plate is welded so that two sides of the reinforcing plate are in contact with the upper frame material and the lower frame material having a substantially L-shaped cross section at an appropriate dimension interval at a position where the upper frame material and the lower frame material are overlapped. The rigidity is increased, and the displacement and stress of the upper frame material and the lower frame material can be suppressed to below an allowable value even when internal and external pressures are applied.

According to a third aspect of the present invention, the height of the reinforcing plate welded to the upper frame material and the lower frame material is substantially the same as the height of the protruding fold of the corrugated heat radiating plate. One end is attached to the inside of the corrugated radiator plate from the upper and lower end surfaces of the corrugated radiator plate, and the reinforcing plate and the reinforcing rod that horizontally bridges the tip of the protruding fold of the corrugated radiator plate are welded. The rigidity of the upper frame material and the lower frame material increases, and the displacement and stress of the upper frame material and the lower frame material can be suppressed below the allowable values even when internal and external pressures are applied, and the reinforcing rods protrude from the corrugated heat sink. The pleats are pressed from the outside, and the force acting on the welds between the upper frame material, the lower frame material and the corrugated radiator plate can be reduced.

According to a fourth aspect of the present invention, in the heat radiating tank for electric equipment, the upper frame member and the lower frame member are channel-shaped bending members each having three sides, and the vicinity of a bending point of the upper frame member and the lower frame member. Since the edge of the corrugated heat sink is welded to
The rigidity of the upper frame material and the lower frame material is increased, and the displacement and stress of the upper frame material and the lower frame material can be suppressed below the allowable values even when internal and external pressures are applied.

According to a fifth aspect of the present invention, the upper frame material and the lower frame material are bent into a substantially L-shape with a radius larger than the thickness of the upper frame material and the lower frame material. Because the waveform heat sink is welded near the end of the arc,
The rigidity of the upper frame material and the lower frame material is increased, and the displacement and stress of the upper frame material and the lower frame material can be suppressed below the allowable values even when internal and external pressures are applied.

[0027]

Embodiments of the present invention will be described below. <First Embodiment> FIG. 1 is a side sectional view showing a main part of a heat radiation tank for electric equipment according to a first embodiment of the present invention, and FIG. 2 is a front view showing a main part of the heat radiation tank for electric equipment of FIG. It is. In the figure,
The same reference numerals and symbols as those in the above-described conventional example indicate the same or corresponding components as those in the above-described conventional example. In the figure, 2
Reference numeral 1 denotes a reinforcing plate in which two sides are welded to an upper frame member 3 having an L-shaped cross section, and reference numeral 22 denotes a reinforcing plate in which one side is welded to a flat lower frame member 4 and the other side is welded to a bottom plate 6.

In the heat radiating tank for electric equipment of this configuration, when the enclosed insulating medium such as insulating oil or gas expands due to the heat generated in the transformer and the fluctuation of the ambient temperature, the tank internal pressure increases. At this time, the upper frame member 3 and the lower frame member 4 receive a bending moment proportional to the side length of the inner diameter of the tank, but the reinforcing plates 21 and 22 are separated from the upper frame member 3 and the lower frame Since it is fixed to the material 4 and the bottom plate 6 by welding, it acts as a support point. In particular, the reinforcing plates 21 and
Since the two sides are welded, the rigidity of the upper frame member 3 and the lower frame member 4 is increased, and the corrugated heat sink 1 near the center of the tank and the roots of the upper frame member 3 and the lower frame member 4, that is, The displacement and stress of the portion A1 in the figure can be kept below the allowable values. In addition, since the stress of the plate material is generated in proportion to the fourth power of the distance between the fulcrums, the reinforcing plates 21 and 21 are selected according to the generated pressure and the applied plate thickness.
It is more effective if the mounting interval of 2 is appropriately selected.

As described above, the heat radiating tank for electric equipment of this embodiment has a plurality of projecting pleats 2 formed by corrugating a thin steel plate, and crushing the upper and lower ends of the projecting pleats 2 to hermetically close them. The corrugated heat radiating plate 1 is superimposed on the inner side surfaces of the upper edge and the lower edge of each corrugated heat radiating plate 1, and the outer surface of the overlapping portion is air-tightly welded to both upper and lower ends of each corrugated radiating plate 1. The upper frame member 3 and the lower frame member 4, the corrugated heat sink 1, the bottom plate 6 for closing the bottom of the upper frame member 3 and the lower frame member 4, and the upper frame member 3 and the lower frame member 4 are corrugated. There are provided reinforcing plates 21 and 22 which are welded to upper and lower portions of a position where the heat radiating plate 1 is overlapped with the bent valleys, respectively.

That is, in the heat radiating tank for electric equipment of the present embodiment, the reinforcing plates 21 and 22 are provided at appropriate positions at positions where the upper frame material 3 and the lower frame material 4 are overlapped with the bent valleys of the corrugated heat radiating plate 1. It is what was welded. Therefore, the corrugated heat sink 1
Without increasing the thickness of the upper frame member 3 and the lower frame member 4, the mechanical strength of the portion where the repetitive stress occurs due to the pressure fluctuation increases. For this reason, the rigidity of the upper frame member 3 and the lower frame member 4 increases,
Even when internal and external pressures are applied, the amount of displacement and stress of the upper frame member 3 and the lower frame member 4 can be suppressed to below an allowable value. And the reliability of the welded portion A1 between the upper frame member 3 and the lower frame member 4 and the corrugated radiator plate 1 can be improved.

Since the reinforcing plates 21 and 22 are vertically divided and welded to the upper frame member 3 and the lower frame member 4, respectively, the upper frame member 3 and the lower frame member 4 are integrally formed as in the prior art. In comparison with the reinforcing plate constituted by the above, there is no need to increase the pitch of the protruding folds 2, and efficient heat radiation can be performed, and the weight can be reduced. In addition, since there is no place where the reinforcing plate and the corrugated heat radiating plate 1 are in contact with each other, the number of places where it is difficult to apply the coating is reduced, and a high-quality radiating tank for electric equipment is obtained.

<Second Embodiment> FIG. 3 is a side sectional view showing a main part of a heat radiation tank for electric equipment according to a second embodiment of the present invention. In the drawing, the same reference numerals and symbols as those of the above-described embodiment indicate the same or corresponding components as those of the above-described embodiment. In the figure, reference numeral 23 denotes a lower frame member having an L-shaped cross section, to which reinforcing plates 22 are welded at predetermined intervals. In particular, in this embodiment, since the lower frame member 23 has an L-shaped cross section,
Two sides of the reinforcing plate 22 can be welded in advance, and there is no need to perform welding work in the tank.

In the heat radiating tank for electric equipment of this configuration, similarly to the first embodiment, when the tank internal pressure rises due to the heat generated in the transformer and the fluctuation of the ambient temperature, the upper frame material 3 and the lower frame material are reduced. 23 receives a bending moment proportional to the side length of the tank inner diameter. However, the upper and lower frame members 3 and 2 are spaced apart from each other by an appropriate distance in the horizontal direction.
3 and the reinforcing plates 21 and 22 are welded on two sides.
The rigidity of the lower frame member 23 is increased, and the displacement and stress of the portion A2 in the figure can be kept below the allowable values. In this embodiment, the reinforcing plate 2 is also used in accordance with the generated pressure and the applied plate thickness.
The mounting intervals of 1, 2 can be appropriately selected.

As described above, the heat radiating tank for electric equipment of this embodiment has a plurality of projecting pleats 2 formed by corrugating a thin steel plate, and crushing the upper and lower ends of the projecting pleats 2 to hermetically close them. The corrugated heat radiating plate 1 is superimposed on the inner side surfaces of the upper edge and the lower edge of each corrugated heat radiating plate 1, and the outer surface of the overlapping portion is air-tightly welded to both upper and lower ends of each corrugated radiating plate 1. The upper frame member 3 and the lower frame member 23 having a substantially L-shaped cross section, the bottom plate 6 for closing the bottom of the corrugated heat sink 1, the upper frame member 3 and the lower frame member 23, and the respective upper frame members 3 and The lower frame member 23 is welded to the upper and lower portions of the position where the lower frame member 23 is overlapped with the bent valley portion of the corrugated heat sink 1 in a state where the two sides are in contact with the upper frame member 3 and the lower frame member 23 each having the substantially L-shaped cross section. And reinforcing plates 21 and 22.

That is, in the heat radiation tank for electric equipment of the present embodiment, the upper frame member 3 and the lower frame member 23 have substantially L-shaped cross sections, and the upper frame member 3 and the lower frame member 23 Are welded so that two sides of the reinforcing plates 21 and 22 are in contact with the upper frame member 3 and the lower frame member 23 having a substantially L-shaped cross section at an appropriate dimensional interval at a position overlapping with the bent valley portion.

Therefore, in this embodiment, as in the above embodiment, the rigidity of the upper frame member 3 and the lower frame member 23 is increased, and even when the internal and external pressures are applied, the upper frame member 3 and the lower frame member 2 are removed.
3 can be suppressed to below the allowable values, the material cost and the weight of the product can be suppressed from increasing, the forming work of the corrugated heat sink 1 is easy, and the upper frame member 3 and the lower frame member 4 are corrugated. The reliability of the welded portion A2 with the heat sink 1 can be improved. Also in the present embodiment, the reinforcing plates 21 and 22 are divided into upper and lower parts and are welded to the upper frame member 3 and the lower frame member 23, respectively. In addition, the weight of the tank is reduced, and the number of places where the coating becomes difficult is reduced.

<Third Embodiment> FIG. 4 is a side sectional view showing a main part of a heat dissipation tank for electric equipment according to a third embodiment of the present invention. FIG. FIG. 4 is a perspective view showing a reinforcing plate that is being used. In the drawings, the same reference numerals and symbols as those in the above-described embodiments denote the same or corresponding components as those in the above-described embodiments. In the figure, reference numeral 24 denotes a reinforcing plate welded to the upper frame member 3, the height of which is substantially the same as the height of the protruding fold 2 of the corrugated radiator plate 1. It is bridged by welding. Reference numeral 25 denotes a reinforcing plate 24 formed on the side of the corrugated radiator plate 1 that contacts the valley.
The reinforcing plate 24 and the welded surface of the upper frame member 3 are securely brought into close contact with each other in consideration of the thickness of the corrugated heat sink 1 and the thickness of the welded meat. 26 is a lower frame member having an L-shaped cross section, and 27 is a reinforcing plate welded to the lower frame member 26 at predetermined intervals.

In the heat radiating tank for electric equipment of this configuration, similarly to the above-described embodiments, when the tank internal pressure rises due to the heat generated in the transformer and the fluctuation of the ambient temperature, the upper frame member 3 and the lower frame member 26 are removed. Receives a bending moment proportional to the side length of the tank inner diameter. However, the reinforcing plates 24 and 27 are separated from the upper frame member 3 and the lower frame member 26 by an appropriate distance in the horizontal direction.
And the reinforcing plate 2
Since the two sides of the members 4 and 27 are welded, the rigidity of the upper frame member 3 and the lower frame member 26 is increased, and the displacement and stress of the portion A3 in the figure can be kept below allowable values. In addition, also in the present embodiment, the reinforcing plate 24,
27 mounting intervals can be selected.

In this embodiment, the reinforcing plates 24,
Since the reinforcing ridges 27 and the protruding folds 2 of the corrugated heat radiating plate 1 are bridged by the reinforcing rods 10 in the horizontal direction by welding, the reinforcing rods 10 suppress the displacement of the corrugated radiating plate 1, and the upper frame member 3 and the lower frame member 26 The welded portion of the corrugated heat sink 1 has a structure in which stress due to the tank pressure does not easily act. The shape and number of the reinforcing rods 10 can be appropriately selected according to the required strength.

As described above, the heat radiating tank for electric equipment of the present embodiment has a plurality of protruding pleats 2 formed by corrugating a thin steel plate, and crushing the upper and lower ends of the protruding pleats 2 to seal them. The corrugated heat radiating plate 1 is superimposed on the inner side surfaces of the upper edge and the lower edge of each corrugated heat radiating plate 1, and the outer surface of the overlapping portion is air-tightly welded to both upper and lower ends of each corrugated radiating plate 1. The upper frame member 3 and the lower frame member 26 having a substantially L-shaped cross section, the bottom plate 6 for closing the bottom of the corrugated heat sink 1, the upper frame member 3 and the lower frame member 26, and the respective upper frame members 3 and The lower frame member 26 is welded to the upper and lower portions of the position where the lower frame member 26 is overlapped with the bent valley portion of the corrugated heat sink 1 with the upper frame member 3 and the lower frame member 26 each having two sides substantially L-shaped in section. At the same time, the upper and lower ends are inserted into the wave radiating plate 1 from the upper and lower end surfaces of the wave radiating plate 1. It mounted in said waveform radiator plate 1
Reinforcing plates 24, 27 having substantially the same height as the protruding pleats 2, and the reinforcing rods 10 having the reinforcing plates 24, 27 and the distal ends of the protruding pleats 2 of the corrugated heat sink 1 bridged in the horizontal direction. .

That is, the heat dissipation tank for electric equipment of the present embodiment comprises the reinforcing plate 2 welded to the upper frame member 3 and the lower frame member 26.
The height of each of the reinforcing plates 24 and 27 is substantially equal to the height of the protruding fold 2 of the corrugated heat radiating plate 1.
The reinforcing plates 24 and 27 and the protruding pleats 2 of the corrugated heat radiating plate 1
Are welded with reinforcing rods 10 for bridging the leading ends of the rods in the horizontal direction.

Therefore, in the present embodiment, as in the above embodiments, the rigidity of the upper frame member 3 and the lower frame member 26 is increased, and even when internal and external pressures are applied, the upper frame member 3 and the lower frame member 2
6 can be suppressed below the allowable values, so that the increase in material cost and product weight can be suppressed, the forming operation of the corrugated heat sink 1 is easy, and the upper frame member 3 and the lower frame member 26 are corrugated. The reliability of the welded portion A3 with the heat sink 1 can be improved. Further, since the reinforcing plates 24 and 27 are vertically divided, there is no need to increase the pitch of the protruding pleats 2,
Since the weight is light and the number of places where the application of the coating becomes difficult is reduced, a high-quality heat radiating tank for electric equipment can be obtained.

Further, the reinforcing rods 10 press the projecting folds 2 of the corrugated heat radiating plate 1 from outside, and the upper frame member 3 and the lower frame member 26 are pressed.
Therefore, the force acting on the welded portion A3 of the corrugated radiator plate 1 can be reduced, so that the reliability of the welded portion A3 between the upper frame member 3 and the lower frame member 26 and the corrugated radiator plate 1 can be further improved.

<Fourth Embodiment> FIG. 6 is a side sectional view showing a main part of a heat radiation tank for electric equipment according to a fourth embodiment of the present invention. In the drawings, the same reference numerals and symbols as those in the above-described embodiments denote the same or corresponding components as those in the above-described embodiments.
In the figure, reference numeral 28 denotes an upper frame member having three sides, and the inner angles of the two sides are bent into a channel shape having an obtuse angle. Reference numeral 29 denotes a lower frame member having the same structure as the upper frame member 28. Upper frame material 28, lower frame material 29 and corrugated heat sink 1
The upper and lower end surfaces of the upper frame member 28 and the lower frame member 29 are welded to each other as close to the bending point as possible.

Also in the heat dissipation tank for electric equipment of this construction, when the tank internal pressure rises, the upper frame member 28 and the lower frame member 29 receive a bending moment proportional to the side length of the tank inner diameter. Frame material 29 is
Since the center side is inclined, the rigidity is higher than that of the upper frame member 3 and the lower frame members 4, 23, 26 composed only of the vertical plate portion against the internal and external pressures as in the above embodiments. large.
Therefore, the welded portion between the upper frame member 28 and the lower frame member 29 near the center of the tank and the root of the corrugated heat sink 1, that is, A in FIG.
The displacement and stress of the four parts can be less than the allowable values. For this reason, the stress and the displacement of the portion A4 in FIG. 6 can be suppressed below the allowable values without increasing the thicknesses of the upper frame member 28, the lower frame member 29, and the corrugated heat sink 1.

As described above, the heat radiating tank for electric equipment of the present embodiment has a plurality of projecting folds 2 formed by corrugating a thin steel plate, and crushing the upper and lower ends of the projecting folds 2 to hermetically close them. The corrugated heat radiating plate 1 is superimposed on the inner side surfaces of the upper edge and the lower edge of each corrugated heat radiating plate 1, and the outer surface of the overlapping portion is air-tightly welded to both upper and lower ends of each corrugated radiating plate 1. And the upper frame member 28 and the lower frame member 29 in which the three sides are bent into a channel shape, the inner angles of the two sides are obtuse, and the welding site is in the vicinity of the bending point.
The heat radiation plate 1 includes a bottom plate 6 that closes the bottom of the upper frame member 28 and the lower frame member 29.

That is, in the heat radiating tank for electric equipment of the present embodiment, the upper frame member 28 and the lower frame member 29 are channel-shaped bent members having three sides, and the upper frame member 28 and the lower frame member 2 are formed.
9 is obtained by welding the edge of the corrugated heat sink 1 near the bending point 9.

Therefore, the upper frame member 28 and the lower frame member 29
The stiffness of the upper frame member 28 and the lower frame member 29 can be suppressed to below an allowable value even when internal and external pressures are applied, so that the material cost and the product weight can be reduced. It is possible to suppress the increase, and to easily form the corrugated radiator plate 1, and to enhance the reliability of the welded portion A4 between the corrugated radiator plate 1 and the upper frame member 28 and the lower frame member 29. In addition, in this embodiment, since no reinforcing plate is required, the number of parts is reduced, and the weight is reduced as compared with the above embodiments. In addition, since there is no reinforcing plate, there are no places where it is difficult to apply the coating, so that a high-quality heat radiating tank for electric equipment can be obtained.

<Fifth Embodiment> FIG. 7 is a side sectional view showing a main part of a heat radiation tank for electric equipment according to a fifth embodiment of the present invention. In the drawings, the same reference numerals and symbols as those in the above-described embodiments denote the same or corresponding components as those in the above-described embodiments.
In the figure, reference numeral 30 denotes an upper frame material, which is bent in a substantially L-shape with a large bending radius of about 5 to 20 times the plate thickness. One side of the straight portion of the upper frame member 30 forms the flange 5, and the other side of the straight portion is welded to the corrugated heat sink 1 near the end of the arc. Reference numeral 31 denotes a lower frame member having a structure similar to that of the upper frame member 30.
The other side of the straight portion is welded to the corrugated heat sink 1 near the arc end.

In the heat radiating tank for electric equipment of this configuration, when the tank internal pressure rises, the upper frame member 30 and the lower frame member 31 receive a bending moment proportional to the side length of the tank inner diameter. Frame material 31 is
Since there is a portion having a large arc, the upper frame member 3 and the lower frame members 4, 23, 26 which are constituted only by the vertical plate portions against the internal and external pressures as in the first to third embodiments are provided. In comparison, the rigidity is large. Accordingly, the displacement and stress of the welded portion between the upper frame member 30 and the lower frame member 31 near the center of the tank and the root of the corrugated heat sink 1, that is, the A5 portion in FIG. For this reason, the stress and displacement of the portion A5 in FIG. 7 can be suppressed below the allowable values without increasing the thicknesses of the upper frame member 30, the lower frame member 31, and the corrugated heat sink 1.

As described above, the heat radiating tank for electric equipment of this embodiment has a plurality of projecting folds 2 formed by corrugating a thin steel plate, and crushing the upper and lower ends of the projecting folds 2 to hermetically close them. The corrugated heat radiating plate 1 is superimposed on the inner side surfaces of the upper edge and the lower edge of each corrugated heat radiating plate 1, and the outer surface of the overlapping portion is air-tightly welded to both upper and lower ends of each corrugated radiating plate 1. And an upper frame member 30 and a lower frame member 31 which are bent in a substantially L-shape with an arc having a radius larger than the thickness of the plate, and the welding portion is located near the end of the arc, and the corrugated heat sink 1, And a bottom plate 6 for closing the bottoms of the upper frame member 30 and the lower frame member 31. That is, in the heat radiation tank for electric equipment of the present embodiment, the upper frame member 30 and the lower frame member 31 are bent in a substantially L shape with a radius larger than the plate thickness, and the upper frame member 3 is bent.
0, the corrugated heat sink 1 near the end of the arc of the lower frame member 31
Are welded.

Therefore, the upper frame member 30 and the lower frame member 31
The rigidity of the upper frame member 30 and the lower frame member 31 can be suppressed to a permissible value or less because the rigidity of the upper frame member 30 and the lower frame member 31 can be suppressed to an allowable value even when internal and external pressures are applied.
An increase in material cost and product weight can be suppressed, the forming operation of the corrugated heat sink 1 is easy, and the upper frame member 30 and the lower frame member 3 are formed.
The reliability of the welded portion A5 between the heat sink 1 and the corrugated heat sink 1 can be improved. Moreover, in this embodiment, as in the fourth embodiment, no reinforcing plate is required, so that the number of parts is reduced and the weight is lighter than each of the above embodiments. In addition, since there is no reinforcing plate, there are no places where it is difficult to apply the coating, so that a high-quality heat radiating tank for electric equipment can be obtained.

<Sixth Embodiment> FIG. 8 is a side sectional view showing a main part of a heat radiation tank for electric equipment according to a sixth embodiment of the present invention. In the drawings, the same reference numerals and symbols as those in the above-described embodiments denote the same or corresponding components as those in the above-described embodiments.
In the figure, reference numeral 32 denotes a reinforcing plate to which two sides of the upper frame member 28 are welded, and reference numeral 33 denotes a reinforcing plate which is welded to one side of the central portion of the lower frame member 29 and the bottom plate 6.

As described above, the heat radiating tank for electric equipment of the present embodiment is a combination of the first embodiment and the fourth embodiment. That is, since the reinforcing plates 32, 33 are welded to the upper frame member 28 and the lower frame member 29, the upper frame member 28,
The rigidity of the lower frame member 29 is further increased from that shown in the first and fourth embodiments. Therefore, even when the internal and external pressures are applied, the displacement and stress of the portion A6 in FIG. 8 can be kept below the allowable values.

For this reason, without increasing the thicknesses of the upper frame member 28, the lower frame member 29, and the corrugated radiator plate 1, FIG.
Since the stress and displacement of the six parts can be suppressed below the allowable values, the increase in the material cost and the product weight can be suppressed as in the above-described embodiments, the work of forming the corrugated heat sink 1 is easy, and the upper frame Weld A between the material 28 and the lower frame material 29 and the corrugated heat sink 1
6 can increase the reliability. In addition, the number of places where application of the coating becomes difficult is reduced, and a high-quality heat radiation tank for electric equipment is obtained.

<Seventh Embodiment> FIG. 9 is a side sectional view showing a main part of a heat radiation tank for electric equipment according to a seventh embodiment of the present invention. In the drawings, the same reference numerals and symbols as those in the above-described embodiments denote the same or corresponding components as those in the above-described embodiments.
In the drawing, 34 is a reinforcing plate welded along the inner arc of the upper frame member 30, and 35 is a reinforcing plate welded over the outer arc of the lower frame member 31 and the bottom plate 6.

As described above, the heat dissipation tank for electric equipment of this embodiment is a combination of the third embodiment and the fifth embodiment. That is, the reinforcing plates 34 and 35 are welded to the upper frame member 30 and the lower frame member 31, and the protruding folds 2 of the corrugated heat sink 1 and the reinforcing plates 34 and 35 are bridged by the reinforcing rods 10 by welding. The rigidity of the upper frame member 30 and the lower frame member 31 is further increased from those shown in the third embodiment and the fifth embodiment. Moreover, the structure is such that stress is hardly generated in the welded portion between the upper frame member 30, the lower frame member 31, and the corrugated radiator plate 1. Therefore, even when the internal and external pressures are applied, the displacement and the stress of the portion A7 in FIG. 9 can be kept below the allowable values.

For this reason, without increasing the thicknesses of the upper frame member 30, the lower frame member 31, and the corrugated radiator plate 1, the A of FIG.
Since the stress and displacement of the 7 parts can be suppressed below the allowable values, the increase in material cost and product weight can be suppressed as in the above-described embodiments, the work of forming the corrugated heat sink 1 is easy, and the upper frame Welding portion A between the material 30 and the lower frame material 31 and the corrugated heat sink 1
7 can increase the reliability. In addition, the number of places where application of the coating becomes difficult is reduced, and a high-quality heat radiation tank for electric equipment is obtained. By the way, in each of the embodiments described above, the heat radiating tank in which the content is a transformer has been described. However, the present invention can be naturally applied to electric devices other than the transformer.

[0059]

As described above, the heat radiating tank for electric equipment according to the first aspect of the present invention includes the corrugated heat radiating plate, the upper frame material and the lower frame material, and the reinforcing plate. Welding the reinforcing plate at the appropriate dimensional interval at the position where the material overlaps the bent valley of the corrugated heat sink increases the rigidity of the upper frame material and the lower frame material. Frame material,
Since the displacement and stress of the lower frame material can be suppressed below the allowable values, the increase in material cost and product weight can be suppressed, the work of forming the corrugated radiator plate is easy, and the corrugated heat radiation with the upper frame material and the lower frame material. The reliability of the welded portion with the plate can be improved, and it becomes a high-quality heat dissipation tank for electric equipment.

According to a second aspect of the present invention, there is provided a heat radiation tank for electric equipment, comprising a corrugated heat radiation plate, an upper frame material, a lower frame material, and a reinforcing plate, wherein the upper frame material and the lower frame material have a substantially L-shaped cross section. The upper frame material and the lower frame material whose two sides of the reinforcing plate are approximately L-shaped in cross section at appropriate dimensional intervals at positions where the upper frame material and the lower frame material overlap the bent valleys of the corrugated heat sink. By welding so as to contact the upper frame material and the lower frame material, the rigidity of the upper frame material and the lower frame material increases, and even when internal and external pressures are applied, the displacement and stress of the upper frame material and the lower frame material can be suppressed to below the allowable value. It is possible to suppress the increase in material cost and product weight, to easily form the corrugated radiator plate, and to improve the reliability of the welded portion between the upper and lower frame members and the corrugated radiator plate. It becomes a heat dissipation tank for electrical equipment.

According to a third aspect of the present invention, there is provided a heat radiating tank for electric equipment, comprising a corrugated heat radiating plate, an upper frame material and a lower frame material, a reinforcing plate, and a reinforcing rod, which are welded to the upper frame material and the lower frame material. The height of the reinforcing plate is substantially the same as the height of the protruding pleats of the corrugated heat sink, and one end of the reinforcing plate is attached to the inside of the corrugated heat sink from the upper and lower end surfaces of the corrugated heat sink. Welding of reinforcing rods that bridge the ends of the protruding pleats in the horizontal direction increases the rigidity of the upper frame material and the lower frame material. Even when internal and external pressures are applied, the upper frame material and the lower frame material are welded. Since the displacement and stress can be suppressed below the allowable values, the increase in material cost and product weight can be suppressed, the forming work of the corrugated heat sink is easy, and the welding of the upper frame material and the lower frame material to the corrugated heat sink is possible. The reliability of the part can be enhanced, and the reinforcing rod is Pressing from the outside, the force acting on the weld between the upper frame material, the lower frame material and the corrugated radiator plate can be reduced, further improving the reliability of the welded portion between the upper frame material and the lower frame material and the corrugated radiator plate. It can be a good quality heat dissipation tank for electrical equipment.

According to a fourth aspect of the present invention, there is provided a heat radiating tank for electric equipment, comprising a corrugated heat radiating plate, an upper frame material and a lower frame material, wherein the upper frame material and the lower frame material are channel-shaped bent members having three sides. The upper frame material, by welding the edge of the corrugated heat sink near the bending point of the lower frame material, the rigidity of the upper frame material, the lower frame material is increased, even when the internal and external pressure is applied, Upper frame material,
Since the displacement and stress of the lower frame material can be suppressed below the allowable values, the increase in material cost and product weight can be suppressed, the work of forming the corrugated radiator plate is easy, and the corrugated heat radiation with the upper frame material and the lower frame material. The reliability of the welded portion with the plate can be improved, and it becomes a high-quality heat dissipation tank for electric equipment.

According to a fifth aspect of the present invention, there is provided a heat radiating tank for electric equipment, comprising a corrugated heat radiating plate, an upper frame material and a lower frame material, wherein the upper frame material and the lower frame material have a substantially L-shape with a radius larger than the plate thickness. The upper frame material, the upper frame material, the rigidity of the lower frame material is increased by welding the corrugated heat sink near the end of the arc of the lower frame material, even when the internal and external pressure is applied , Upper frame material,
Since the displacement and stress of the lower frame material can be suppressed below the allowable values, the increase in material cost and product weight can be suppressed, the work of forming the corrugated radiator plate is easy, and the corrugated heat radiation with the upper frame material and the lower frame material. The reliability of the welded portion with the plate can be improved, and it becomes a high-quality heat dissipation tank for electric equipment.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a main part of a heat dissipation tank for electric equipment according to a first embodiment of the present invention.

FIG. 2 is a front view showing a main part of the heat radiating tank for electric equipment of FIG. 1;

FIG. 3 is a side sectional view showing a main part of a heat dissipation tank for electric equipment according to a second embodiment of the present invention.

FIG. 4 is a side sectional view showing a main part of a heat dissipation tank for electric equipment according to a third embodiment of the present invention.

FIG. 5 is a perspective view showing a reinforcing plate used in the heat radiating tank for electric equipment of FIG. 4;

FIG. 6 is a side sectional view showing a main part of a heat radiation tank for electric equipment according to a fourth embodiment of the present invention.

FIG. 7 is a side sectional view showing a main part of a heat dissipation tank for electric equipment according to a fifth embodiment of the present invention.

FIG. 8 is a side sectional view showing a main part of a heat dissipation tank for electric equipment according to a sixth embodiment of the present invention.

FIG. 9 is a side sectional view showing a main part of a heat dissipation tank for electric equipment according to a seventh embodiment of the present invention.

FIG. 10 is an overall perspective view showing a conventional heat dissipation tank for electric equipment.

FIG. 11 is a side sectional view showing a main part of a conventional heat dissipation tank for electric equipment.

FIG. 12 is a side sectional view showing a main part of a conventional heat dissipation tank for electric equipment.

FIG. 13 is an enlarged perspective view of a main part showing a conventional heat dissipation tank for electric equipment.

FIG. 14 is a horizontal sectional view showing a wave-shaped heat radiating plate when receiving the internal pressure of a conventional electric device radiating tank.

FIG. 15 is an enlarged sectional view of a main part showing another conventional heat dissipation tank for electric equipment.

FIG. 16 is an enlarged sectional view of a main part showing another conventional heat dissipation tank for electric equipment.

FIG. 17 is a side sectional view showing still another conventional heat dissipation tank for electric equipment.

FIG. 18 is an enlarged sectional view of a main part showing the heat dissipation tank for electric equipment of FIG. 17;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Corrugated heat sink 2 Protrusion fold 2a Crushed part 3,28,30 Upper frame material 4,23,26,29,31 Lower frame material 5 Flange 6 Bottom plate 7 Cover 10 Reinforcing rod 21,22,24,27,32 ~ 35 Reinforcement plate 25 Notch

Claims (5)

(57) [Claims] 1. A plurality of corrugated heat radiating plates formed by corrugating a thin steel plate to form protruding folds, and crushing and sealing both upper and lower ends of the protruding folds; An upper frame material and a lower frame material which are superimposed on the inner side surface of the lower edge portion, and the outer surfaces of the superposed portions are air-tightly welded to upper and lower ends of each of the corrugated heat sinks, and each of the upper frame materials and A radiating tank for electric equipment, comprising: a lower frame member and reinforcing plates provided at upper and lower portions at positions where the bent valley portions of the corrugated radiating plate overlap with each other. 2. A plurality of corrugated heat radiating plates formed by corrugating a thin steel plate to form protruding folds, and crushing and sealing both upper and lower ends of the protruding folds; A cross-section substantially L which is superimposed on the inner side surface of the lower edge portion and the outer side surface of the superimposed portion is hermetically welded to both upper and lower ends of each of the corrugated heat sinks.
Upper frame material and lower frame material, and upper and lower portions of the upper and lower frames at positions where the respective upper frame material and lower frame material are overlapped with the bent valleys of the corrugated heat sink, each having two sides each having the substantially L-shaped cross section. A heat dissipating tank for electric equipment, comprising a frame member and a reinforcing member welded to the lower frame member in a contact state. 3. A plurality of corrugated heat radiating plates formed by corrugating a thin steel plate to form protruding folds, and crushing and sealing both upper and lower ends of the protruding folds; A cross-section substantially L which is superimposed on the inner side surface of the lower edge portion and the outer side surface of the superimposed portion is hermetically welded to both upper and lower ends of each of the corrugated heat sinks.
Upper frame material and lower frame material, and upper and lower portions of the upper and lower frames at positions where the respective upper frame material and lower frame material are overlapped with the bent valleys of the corrugated heat sink, each having two sides each having the substantially L-shaped cross section. The upper and lower ends are welded in a state of contact with the frame member and the lower frame member, and the upper and lower ends thereof are substantially the same height as the protruding folds of the corrugated radiator plate which are mounted inside the corrugated radiator plate from the upper and lower end surfaces of the corrugated radiator plate. A radiating tank for electric equipment, comprising: a reinforcing plate having a reinforcing plate; and a reinforcing rod having a front end portion of the protruding fold of the reinforcing plate and the corrugated heat radiating plate bridged in a horizontal direction. 4. A plurality of corrugated radiating plates formed by corrugating a thin steel plate to form protruding folds, and crushing and sealing both upper and lower ends of the protruding folds; The upper surface is overlapped with the inner surface of the lower edge, and the outer surface of the overlapping portion is air-tightly welded to the upper and lower ends of each of the wave radiating plates, and three sides are bent into a channel shape, and the two sides are bent. A heat radiation tank for electric equipment, comprising: an upper frame member and a lower frame member having an inner angle of the obtuse angle and the welding portion being near the bending point. 5. A plurality of corrugated radiating plates formed by corrugating a thin steel plate to form protruding folds, and crushing and sealing both upper and lower ends of the protruding folds; The upper surface is overlapped on the inner surface of the lower edge, and the outer surface of the overlapping portion is air-tightly welded to the upper and lower ends of each of the wave radiating plates, and is substantially L-shaped by an arc having a radius larger than the plate thickness. A heat radiation tank for electric equipment, comprising: an upper frame material and a lower frame material, wherein the upper and lower frames are bent so that the welding portion is near the end of the arc.