JPH07335448A - Radiator for oil-filled electric equipment - Google Patents

Abstract

PURPOSE:To provide a radiator for oil-filled electric equipment easy to be assembled. CONSTITUTION:Two metallic boards 11a, 11b respectively having cylindrical header forming parts 11a1, 11b1 and 11a2, 11b2 are opposed so as to form radiating pannels 11, 11 by junctioning the peripheries of both metallic boards using a winding part p. Next, radiating pannels 11, 11, inner flange h2, h2' provided in adjacent upper header forming parts 11a1, 11b1 and the same provided in the lower header forming parts 11a2, 11b2 are abutted against as respective pairs of inner flanges so that the inner flanges of respective pairs may be held between presser bar plates 12, 12' to be coupled with a screw 14 connecting upper part header forming parts 11a1, 11b1 and the lower part header forming parts 11a2, 11b2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator used for oil-filled electrical equipment such as a transformer.

[0002]

2. Description of the Related Art In oil-filled electrical equipment such as transformers, a radiator is attached to an oil-filled case containing the body of the electrical equipment to cool the insulating oil whose temperature has risen due to the heat generated by the electrical equipment. There is.

FIGS. 9 to 11 show a radiator which has been conventionally used in oil-filled electrical equipment such as a transformer. The radiator is composed of a plurality of radiator panels 1 and 1 arranged side by side in the horizontal direction. , And an upper header 2 and a lower header 2'which connect the upper and lower ends of these heat dissipation panels, respectively. The heat dissipation panel 1 is, as shown in FIG.
The metal plates 1a and 1b formed so that the peaks m and the valleys v are alternately arranged are overlapped and the peripheral edges of both metal plates are joined by seam welding or arc welding.
These are joined by spot welding to form an oil passage d extending in the up-and-down direction between the facing ridges m. The mountain portion m and the valley portion v are provided such that the upper ends and the lower ends thereof terminate at positions closer to the front side than the upper end and the lower end of the heat radiating panel, respectively. The upper and lower ends of a series of oil passages d, d, ... Are made to communicate with each other through a passage e and a lower communication passage e ′. Header connection portions 1A and 1A ′ having openings that open upward and downward, respectively, are provided at the upper and lower ends of the heat dissipation panel 1, and these header connection portions are formed into duct-like upper headers 2 respectively.
And the lower header 2 '(see FIG. 11) is joined to the heat radiating panel connection portion by arc welding or gas welding, and the communication paths e and e'at the upper end and the lower end of each heat radiating panel are inside the upper header 2 and the lower header 2, respectively. It is made to communicate in ´. Flange 2A and 2A 'are provided at one end of each of the upper header 2 and the lower header 2', and the other ends of both headers are closed by an end wall.

The radiator described above is electrically connected by connecting the flanges 2A and 2A 'of the upper headers 2 and 2'to upper oil pipes and lower oil pipes provided on the upper and lower sides of the case of the electric device, respectively. Attached to the equipment, the oil passage in each heat radiation panel is connected to the upper header 2 and the lower header 2 '.
Through to the inside of the case, and the inside of each header and the inside of each heat dissipation panel are filled with insulating oil.

When the insulating oil is heated by the heat generated from the electric device, the lower part of the electric device case → the upper part of the electric device case → the upper header 2 → the oil passage d in each heat radiation panel → the lower header 2 '→ the electric device case Insulating oil circulates in the lower path of
The heat dissipation panel 1 exchanges heat between the insulating oil and the outside air to cool the insulating oil.

The circulation of the insulating oil may be due to natural convection, or may be forced to be performed using a pump.

[0007]

As described above, in the conventional heat radiator for oil-filled electrical equipment, each heat radiation panel is assembled by welding, and the heat radiation panel is also welded to the upper header and the lower header. Was going by.

However, since each heat radiating panel is made of a thin metal plate, if the heat radiating panel is assembled and the heat radiating panel and the header are connected by welding as described above, the welding heat causes distortion or distortion in each part of the heat radiating panel. Deformation is unavoidable. Therefore, it is necessary to correct the shape of each part after welding, and it is inevitable that the number of man-hours for assembling the radiator increases.

Further, if the assembly of each heat dissipation panel and the connection between the heat dissipation panel and the header are performed by welding, the inside of the heat dissipation panel may be contaminated by spatter, dust, etc. generated during welding, so the inside of the heat dissipation panel is cleaned. There was a problem that was needed.

An object of the present invention is to make it possible to assemble a radiator without welding so as to prevent the heat radiation panel from being distorted or deformed, or from being contaminated inside. It is to provide a radiator for incoming electrical equipment.

Another object of the present invention is to assemble the heat dissipation panel without welding and to form the upper header and the lower header without welding, thereby reducing the number of assembling steps and improving the manufacturing efficiency. It is to provide a radiator for oil-filled electrical equipment that is capable of

[0012]

According to the present invention, a plurality of heat radiating panels having oil passages inside are arranged side by side in a horizontal direction with their plate surfaces in parallel, and the upper and lower parts of the plurality of heat radiating panels are arranged. Is connected via an upper header and a lower header, respectively, and relates to a radiator for oil-filled electrical equipment.

In the present invention, each heat dissipation panel has two metal plates integrally having a cylindrical upper header forming portion and a lower header forming portion in the upper portion and the lower portion, respectively. The two metal plates are arranged so as to face each other in a state of projecting to the opposite side, and the peripheral edges of the two metal plates are joined by tightening.

Two adjacent heat radiation panels are used as a pair of heat radiation panels, and the upper header formation portions and the lower header formation portions of each pair of heat radiation panels are fastened by fastening means using screws to release a plurality of heat radiations. The panels are connected to each other, and the upper header forming part and the lower header forming part of the plurality of heat dissipation panels connected to each other form an upper header and a lower header, respectively.

Each of the upper header forming portion and the lower header forming portion is, for example, a cylindrical portion protruding from a plate surface of a metal plate forming the heat dissipation panel, and an inner portion protruding inward in the radial direction from the tip of the cylindrical portion. The flanges are integrally formed with each other, and the pair of inner flanges of the adjacent upper header forming portions of each pair of heat dissipation panels and the pair of inner flanges of the adjacent lower header forming portions are arranged to face each other.

In the case of configuring each header forming portion as described above, the fastening means is a pair of holding plates which are annularly formed and face each other so as to sandwich the inner flange of each pair therebetween.
It can be constituted by a screw for fastening each pair of holding plates to each other.

When the upper header forming portion and the lower header forming portion are configured as described above, the fastening means also has a male thread on the outer periphery and is a tubular shape arranged so as to penetrate through the inside of each pair of inner flanges. Of the first fastener and a second fastener having an internal thread on the inner circumference and screwed onto the external thread of the first fastener on one side of each pair of inner flanges. You can also

In this case, the first and second fasteners are provided with opposed flange portions with a pair of inner flanges in between, and the pair of flange portions are provided between the flange portions of the first and second fasteners. Tighten a pair of inner flanges while sandwiching the inner flanges.

Each of the upper header forming portion and the lower header forming portion also has a cylindrical portion protruding from the plate surface of the metal plate constituting the heat dissipation panel, and an annular shape protruding inward in the radial direction from the tip of the cylindrical portion. The inner flange and the cylindrical skirt portion projecting from the inner peripheral portion of the inner flange to the side opposite to the cylindrical portion may be integrally formed. In this case, the pair of skirt portions of the adjacent upper header forming portions of each pair of heat dissipation panels and the pair of skirt portions of the adjacent lower header forming portions are axially opposed to each other.

When the respective header forming portions are constructed in this way, the fastening means has a pair of nuts fitted respectively to the inner circumferences of the respective skirt portions and a male screw portion on the outer circumference. The threaded portion may be configured by a tubular fastener in which the female threaded portion on the inner circumference of the pair of nuts is screwed.

In this case, the pair of nuts are provided with an outer flange which is brought into contact with the inner flange integrally formed with the skirt portion into which the nuts are fitted. Further, the female thread portions of the pair of nuts are provided so as to have a reverse thread relationship with each other, and the pair of nuts are tightened in a direction in which they are pulled together by a fastener.

Further, the opposite ends of the pair of nuts are crimped so as to wrap the end portions of the skirt portions corresponding to the respective nuts, and the pair of nuts are fixed to the corresponding skirt portions by the crimping portions.

As described above, each header portion has a tubular portion, and an inner flange protruding inward in the radial direction from the tip of the tubular portion,
A pair of skirt portions of adjacent upper header forming portions of each pair of heat radiating panels and adjacent lower headers are formed by a tubular skirt portion protruding from the inner peripheral portion of the inner flange to the opposite side. When the pair of skirt portions of the forming portion are opposed to each other in the axial direction, the fastening means includes a nut fitted over the inner circumference of each pair of skirt portions and a male screw portion on the outer circumference of each pair. It is also possible to use a pair of fasteners screwed into the nut from the inner flange side integrally provided on the skirt portion.

In this case, on the outer circumference of the nut, a protrusion is provided around the pair of skirts, the protrusions being interposed between the opposite ends. Further, the pair of fasteners is provided with an outer flange facing the inner flange integrally formed with the pair of skirts from the inside, and an outer flange of the pair of fasteners and an inner flange facing the outer flange. A sealant is filled between the nut and the pair of skirts. Then, the pair of skirts are tightened in a direction in which the pair of skirts are attracted to each other, and the adjacent ends of the pair of skirts are abutted against the protrusions on the outer circumference of the nut.

As described above, when each header forming portion is configured and the skirt portions of the pair of adjacent header forming portions of each pair of heat radiation panels are arranged to face each other, the fastening means is
An annular pressing ring fitted over the outer circumference of each pair of skirts, a pair of tightening rings fitted on the inner circumference of each pair of skirts, and a direction for pulling the pair of tightening rings together It can also be configured with a tightening screw. In this case, the inner peripheral surface on one end side and the inner peripheral surface on the other end side of the holding ring that surrounds one and the other of the pair of skirt portions respectively have inner diameters as they go toward the one end side and the other end side of the holding ring, respectively. The taper surface is inclined so as to be large. The outer peripheral surfaces of the pair of tightening rings fitted to one and the other of the pair of skirts are tapered surfaces that are inclined in the same direction as the corresponding tapered surfaces of the pressing ring.

Each of the upper header forming portion and the lower header forming portion also includes a tubular portion projecting from the plate surface of the metal plate constituting the heat dissipation panel, and an intermediate inner portion projecting radially inward from the tip of the tubular portion. A shape in which a flange, a tubular skirt portion projecting from the inner peripheral portion of the intermediate inner flange to the side opposite to the tubular portion, and an end inner flange projecting radially inward from the tip of the skirt portion are integrally formed. It can also be configured. In this case, the end inner flanges of the pair of adjacent upper header forming portions and the end inner flanges of the pair of adjacent lower header forming portions of each pair of heat dissipation panels are arranged to face each other in the axial direction, and the fastening means Is a pair of nuts fitted to the inner circumference of each pair of skirts, and a male threaded portion on the outer circumference, and the male threaded portion is screwed onto the female threaded portion of the inner circumference of the paired nuts. And a tubular fastener.

In this case, the pair of nuts are provided with an outer flange which comes into contact with the intermediate inner flange integrally formed with the skirt portion into which the respective nuts are fitted, from the inside. In addition, the female threads of the pair of nuts are provided so as to have a reverse thread relationship with each other, and the fasteners are tightened in the direction of pulling the pair of nuts toward each other so that the ends of the pair of nuts are adjacent to each other. Insert the internal flange.

[0028]

As described above, the heat radiation panels are formed by joining the peripheral portions of the two metal plates by winding, and the upper header forming portion and the lower header forming portion integrally provided on the metal plates are respectively screwed. If the upper header and the lower header are configured by fastening with the fastening means used, the radiator can be assembled without tedious welding that requires skill, which facilitates manufacturing of the radiator. it can.

Further, since welding is not performed when assembling the radiator, it is possible to prevent the radiator panel from being distorted or deformed due to thermal strain, and the inside of the radiator panel is contaminated by welding spatter or the like. Can be prevented. Therefore, the work of correcting the shape of each part of the heat dissipation panel can be omitted, and the cleaning of the inside of the heat dissipation panel can be omitted by performing the assembling work in a clean room.

Further, when the peripheral edge of the metal plate is connected by winding, the cut surface of the edge of the metal plate will not be caught inside and exposed to the outside, so it will be protected in advance as a metal plate constituting the heat dissipation panel. If you use a painted one,
It is possible to omit the protective coating of the heat dissipation panel after assembling the heat sink, and to improve the manufacturing efficiency.

Further, with the above construction, it is not necessary to perform welding for connecting the heat radiation panels to each other, and therefore, within the limits necessary for obtaining the predetermined mechanical strength and rigidity without considering weldability. Thus, the thickness of the metal plate forming the heat dissipation panel can be reduced, and the weight of the radiator can be reduced and the material cost can be reduced.

When the peripheral portions of the heat radiating panels are joined by seam welding, it is unavoidable that a gap is created at the joint of the metal plates. When the protective coating is applied to the outer surface of the container after it is assembled, it becomes difficult to attach the protective coating film in the gap, which causes the problem that rust occurs in the gap and deteriorates the heat dissipation panel. .

On the other hand, when the peripheral edges of the two metal plates constituting the heat dissipation panel are joined by winding as described above, a gap is prevented from being formed on the outer surface of the peripheral edge of the heat dissipation panel. Therefore, it is possible to completely apply protective coating to the joint portion at the peripheral portion of the heat dissipation panel.

[0034]

1 to 3 show an embodiment of the present invention, FIG. 1 (A) is a front view showing a part of a radiator of this embodiment, and FIG. 1 (B) is the same embodiment. Omit a part of the heat sink of the example,
FIG. 2 (A) is a side view showing a part of the heat dissipation panel in section, and FIG. 2 (B) is an enlarged cross-sectional view of the caulking portion of the heat dissipation panel. 3A and 3B are enlarged sectional views of the header forming portion of the heat dissipation panel.

In these figures, 11 is a heat dissipation panel, and each heat dissipation panel is formed in a shape in which a rectangular corner is rounded as shown in FIG. 1 (A), and a mountain portion m and a valley portion are formed. v
Two thin metal plates 11 formed so that and are alternately arranged
a and 11b [see FIG. 2 (A)], and the upper and lower portions of the metal plates 11a and 11b are cylindrical upper header forming portions 11a1 and 11b1 and lower header forming portion 1, respectively.
1a2 and 11b2 are integrally provided.

Of the series of heat dissipation panels 11, 11, ... Arranged side by side in the lateral direction, the heat dissipation panel 11 at the endmost end disposed on one end side in the side-by-side installation direction (position farthest from the case of the electric device). The metal plate 11a located outside the window [FIG. 1 (B)]
3A, the header forming portions 11a1 and 11a2 of the metal plate 11a located at the rightmost end of the metal plate 11a have cylindrical cylindrical portions h1 protruding from the metal plate and a tip of the cylindrical portion. It consists of the bottom plate ho that closes the opening, and the other metal plate 1
The header forming portions 11a1 and 11a2 of 1a are composed of a cylindrical tubular portion h1 projecting from a metal plate, and an inner flange h2 projecting radially inward from the tip of the tubular portion. All the tubular parts h1 are formed to have the same inner diameter dimension, and all the inner flanges h2 are formed to have the same inner diameter dimension. Similarly, the header forming portions 11b1 and 11b2 of the metal plate 11b are cylindrical portions h1 protruding from the metal plate.
′ And an inner flange h2 ′ that projects radially inward from the tip of the tubular portion, and the inner diameters of the tubular portion h1 ′ and the inner flange h2 ′ are the tubular portion h1 and the inner flange of the metal plate 11a, respectively. It is set equal to the inner diameter of h2. The crests and troughs of each metal plate and each header forming part can be formed simultaneously when each metal plate is formed by press working.

The crests m and the troughs v of each metal plate are provided such that the upper and lower ends thereof terminate at positions closer to the front than the upper and lower ends of the metal plates, respectively.
Regions S [see FIG. 1 (A)] where the peaks m and the valleys v do not exist are formed near the upper end and the lower end of 1b, respectively.

As shown in FIG. 2, the metal plates 11a and 11b forming each heat dissipation panel are arranged to face each other with their peaks m facing each other and their valleys v contacting each other. The peripheral edge portions of the metal plates 11a and 11b are joined by a winding tightening portion p formed continuously along the peripheral edge portion, and the valley portions v, v are spaced at a predetermined interval in the vertical direction of the valley portion. The caulking portion q formed like a spot [Fig. 2 (B)]
Reference].

The inner flanges of the upper header forming portions 11a1 and 11b1 and the inner flanges of the lower header forming portions 11a2 and 11b2 of the adjacent heat dissipation panels 11 and 11 face each other in the axial direction as a pair of inner flanges h2 and h2 '. It is arranged. An annular pair of holding plates 12, 12 'is brought into contact with the inner surfaces of the inner flanges of each pair, and the pair of holding plates 12, 12' sandwiches the inner flanges h2, h2 'of the pair. It is arranged opposite. The pressing plates 12 and 12 'are made of a metal material that is sufficiently thicker than the metal plate forming the heat dissipation panel.

In this embodiment, the pair of inner flanges h2,
The packing 13 is inserted between the h2 'and the pair of holding plates 1
A screw 14 penetrating a hole provided in one of the pressing plates 12 and 12 '(the pressing plate 12 in the illustrated example) and the pair of inner flanges h2 and h2' penetrates the other of the pressing plates 12 and 12 '(the illustrated example). In the example, it is screwed into a screw hole provided in the pressing plate 12 ').
A plurality of screws 14 are provided at equal intervals in the circumferential direction of the inner flange of each header forming portion, and these screws 14 clamp each pair of pressing plates 12 and 12 ′ in a direction in which they are attracted to each other. As a result, each pair of pressing plates 12,
The pair of inner flanges h2, h2 'are sandwiched between 12' and fastened. In this embodiment, a fastening means for fastening the inner flanges of the upper and lower header forming portions of the adjacent heat radiation panel is constituted by the pressing plates 12 and 12 'of each pair and the screw 14.

A plurality of heat radiation panels 1 arranged side by side in the horizontal direction
The heat dissipation panel 1 arranged at the outermost end (position closest to the case of the electric device) on the other end side in the parallel installation direction among the terminals 1, 11 ,.
1 [Outer metal plate 1 located on the electric equipment case side of the heat dissipation panel 11 arranged at the leftmost end in FIG. 1 (B)]
1b includes an upper header forming portion 11b1 and a lower header forming portion 1
Each of 1b2 has a flange 15 connected to an electric device.
end header tubes 15 and 16 having ends a and 16a
Are connected.

As shown in FIG. 3 (B), the end header tube 15 has an inner flange 1 at the tip of each body portion 15b.
5c, and the inner flange 15c has an upper header forming portion 11b1 of the outer metal plate 11b of the heat dissipation panel 11 at the end.
Is abutted against the outer surface of the inner flange h2 'of the above through a packing 13. Further, a holding plate 12 'is arranged inside the inner flange h2' of the upper header forming portion 11b1 of the endmost metal plate 11b, and the holding plate 12 'is fixed to the inner flange 15c of the end header pipe 15 by the screw 14. It has been concluded. A plurality of screws 14 for fastening the holding plate 12 'inside the inner flange of the header forming portion 11b1 to the inner flange of the end header tube 15 are provided at equal intervals in the circumferential direction of the end header tube 15, The screw 14 is a hole formed in the inner flange 15c of the end header tube and the header forming portion 11 of the heat dissipation panel at the endmost portion.
It is screwed into a screw hole provided in the holding plate 12 'through a hole provided in the inner flange h2' of b1.

Similarly, the inner flange h of the lower header forming portion 11b2 of the metal plate 11b on the outermost side of the heat radiating panel 11 at the endmost portion.
The holding plate arranged inside 2'is fastened to the inner flange (not shown) provided at the tip of the main body portion 16b of the end header pipe 16 with a screw to fix the end of the electric equipment case side. The lower header forming portion 11b2 and the end header pipe 16 are connected.

In this embodiment, the upper header forming portions 11a1 and 11b1 and the lower header forming portions 11a2 and 11b2 connected to each other by the fastening means using screws form the upper header 17 and the lower header 18, respectively, and the end portions The flanges 15a and 16a of the header pipes 15 and 16 are connected to the flanges of the oil passage pipes for radiator connection which are provided at the upper and lower portions of the case of an electric device (not shown), respectively.

The tightening portion p for joining the peripheral portions of the metal plates 11a and 11b is formed by crimping the metal plates while they are superposed in a state where the metal plates are overlapped with each other. The end face is caught inside and is not exposed to the outside. By thus joining the peripheral portions of the two metal plates 11a and 11b by the tightening process, the respective portions can be joined without creating a gap in the peripheral portions. Therefore, when protective coating is applied to the outer surface of the heat dissipation panel, it is possible to prevent a portion where the coating film is not attached from occurring. In addition, with the cut end face of the metal plate wound inside,
Since the peripheral portions of the metal plates are joined together, using a metal plate that has been preliminarily coated with a protective coating makes it possible to omit the protective coating on the outer surface of the heat dissipation panel.

As shown in FIG. 2B, the caulking portion q that joins the valley portions v of the metal plates 11a and 11b is formed by partially overlapping the valley portions of the two metal plates 11a and 11b. They are deformed so that they are pushed out in one direction, and the pushed portions are crimped so as to be crushed, so that they are joined together so that they do not come out. This crimped portion q is formed so that its cross section has a circular shape, for example. .

In the heat dissipation panel 11 described above, oil passages d extending in the vertical direction are formed between the peaks m of the metal plates 11a and 11b, and the upper and lower ends of each oil passage d are the upper header 17 and the lower header, respectively. The oil passages are formed in the oil passages 18, respectively.

When the above radiator is connected to the case of an electric device, the insulating oil in the case of the electric device is in the case of the electric device → in the upper header 17 → the oil passage d in the heat dissipation panel → in the lower header 18 → the electric device. The insulating oil is circulated in the path of the case, and heat is exchanged between the insulating oil and the outside air through the metal plates 11a and 11b forming the heat dissipation panel to cool the insulating oil.

As in the above embodiment, the two metal plates 11 are
A plurality of heat dissipating panels 11, 11, ... Formed by joining a and 11b together by the winding tightening portion p and the crimping portion q are arranged side by side with their respective plate surfaces in parallel, and are respectively integrated with the metal plates of the adjacent heat dissipating panels. Molded upper header forming part 11
When the a1 and 11b1 and the lower header forming portions 11a2 and 11b2 are fastened by fastening means using screws to form the upper header 14 and the lower header 15, respectively, the radiator can be assembled without welding. It is possible to prevent each part of the heat dissipation panel from being deformed by welding heat, and it is possible to eliminate the need to perform the work of correcting the shape of the heat dissipation panel. Further, it is possible to prevent the inside of the heat dissipation panel from being contaminated by welding spatter or the like. Therefore, cleaning inside the heat dissipation panel can be omitted by performing the assembly in a clean room.

Further, when the peripheral edge portion of the metal plate is connected by winding as in the above embodiment, the cut surface of the edge portion of the metal plate is caught inside and is not exposed to the outside. Further, when the inner flanges of the header forming portions are abutted and connected as described above, the cut surface of the edge portion of the metal plate is not exposed to the outside even at the connecting portion of the header forming portions. As described above, according to the present invention, since the cut end surface of the metal plate that constitutes the heat dissipation panel is not exposed, if the metal plate that constitutes the heat dissipation panel is previously coated with protective coating, It is possible to omit the protective coating of the heat dissipation panel after assembling the container, and to improve the manufacturing efficiency.

If a heat dissipation panel is formed using a metal plate that has been pre-coated, a large number of heat dissipation panels can be stocked, and heat dissipation devices of various specifications can be manufactured in a short time. The period can be shortened.

Further, with the configuration as in the above-mentioned embodiment, since it is not necessary to weld the heat radiation panel when assembling the radiator, it is necessary to obtain the predetermined mechanical strength and rigidity without considering the weldability. The thickness of the metal plate forming the heat dissipation panel can be reduced within the above limit, and the weight of the radiator can be reduced and the material cost can be reduced.

In the above embodiment, the four heat dissipation panels 11 are used.
However, in the present invention, the number of heat radiation panels is arbitrary. The number of heat radiation panels is appropriately set according to the amount of heat generated by the electric device.

In the above embodiment, the packing 13 is interposed between the pair of inner flanges h2 and h2 'of the header forming portions of the adjacent heat radiating panels, but the sealing means of each fastening portion is optional. For example, instead of using packing, a liquid or paste sealing material can be used.

In the above embodiment, the fastening means for fastening the adjacent header forming portions by the pair of holding plates and the screws for fastening the holding plates, which are respectively arranged inside the inner flanges of the pair of the adjacent header forming portions. However, various modifications can be considered for the method of fastening the adjacent header forming portions. Various modifications of the fastening structure of the adjacent header forming portions will be described below with reference to FIGS. 4 to 8. Figure 4
8 to 8, only the connection structure of the upper header forming portion is shown, but the fastening structure of the lower header forming portion in each modification is exactly the same as the fastening structure of the upper header forming portion.

FIGS. 4A and 4B show a first modification of the fastening structure of the adjacent upper header forming portions, and FIG. 4A shows the side farthest from the case of the electric device. The connecting structure of the upper header forming portion near the outermost portion is shown, and FIG. 6B shows the connecting structure of the upper header forming portion near the outermost portion on the side closest to the case of the electric device. In this example, each pair of inner flanges h2 has an external thread 21a on the outer circumference.
, H2 ′ and a tubular first fastener 21 arranged so as to penetrate through the inside thereof, and an internal thread 22a on the inner circumference thereof, and one side of each pair of inner flanges h2, h2 ′ (illustrated example). H2
The fastening means is composed of the second fastener 22 which is disposed on the ‘side’ and which is screwed into the male screw 21 a of the first fastener 21. The first and second fasteners 21 and 22 are opposed to each other with the pair of inner flanges h2 and h2 'interposed therebetween.
1b and 22b having a pair of inner flanges h2 between the outer flanges 21b and 22b of the first and second fasteners.
, H2 'are clamped in a state of being sandwiched.

Further, as shown in FIG. 4B, the inner flange 15c of the end header pipe 15 and the inner flange h2 'of the header forming portion 11b1 have the same first fastener 21 and the second fastener 21 as described above. It is fastened by a fastener 22.

Also in this example, between the inner flanges h2 and h2 'of the adjacent header forming portions, and between the inner flange 15c of the end header pipe and the inner flange h2' of the header forming portion of the endmost metal plate. A packing can be interposed between them.

In this example, the first fastener 21 and the second fastener 22 serve as fastening means for fastening the header forming portions adjacent to each other and fastening means for fastening the header forming portion at the end and the header pipe. It is configured.

FIGS. 5A and 5B show a second modified example of the fastening structure of the adjacent header forming portions. In this example, the upper header forming portions 11a1 and 11b1 are respectively
Tubular portions h1 and h1 'that project from the plate surfaces of the metal plates 11a and 11b that form the heat dissipation panel 11, and inner flanges h2 and h2' that project radially inward from the tips of the tubular portions,
It has integrally cylindrical tubular parts h1 and h1 'and cylindrical skirt parts h3 and h3' protruding from the inner peripheral part of the inner flange to the opposite side. The skirt portions h3, h3 'of a pair of the adjacent upper header forming portions 11a1, 11b1 are arranged so as to face each other in the axial direction.

A pair of nuts 23, 23 'are fitted on the inner circumferences of the pair of skirts h3, h3', respectively, and the tips of the pair of nuts 23, 23 'facing each other correspond to the skirt h3. , H3 ′ are crimped so as to wrap around the end portions, and the pair of nuts 23, 23 ′ are fixed to the corresponding skirt portions h3, h3 ′ by the crimping portions 23b, 23b '. Outer flanges 23c and 23c 'are provided at the rear end portions of the pair of nuts 23 and 23', and these outer flanges 23c and 23c 'are nuts 23 and 23'.
Are abutted from the inside to inner flanges h2 and h2 'which are integrally formed with the skirt portions h3 and h3' into which they are fitted.

Female threads 23 on the inner circumference of the nuts 23, 23 '
a and 23a 'are provided so as to have a reverse threaded relationship with each other, and the female thread of these nuts is connected to the tubular fastener 2
The male screw 25a provided on the outer periphery of the screw 5 is screwed.
The fastener 25 tightens the pair of nuts 23, 23 ′ in a direction in which they are pulled toward each other. In the present embodiment, the crimped portions 23b, 2 of the tips of the nuts 23, 23 'are
The O-ring 26 is inserted between 3b 'and the nuts 23, 2
The crimped portions 23 b and 23 b ′ of 3 ′ are butted against each other via the O-ring 26.

In this example, a pair of nuts 23, 23 ',
A fastening means for fastening the header forming portions 11a1 and 11b1 together with the fastener 25 is configured.

FIG. 6 shows a third modification of the fastening structure for fastening the adjacent header forming portions. In this example, the header forming portions 11a1 and 11b1 of the adjacent heat dissipation panels are shown in FIG.
Similar to the example shown in FIG. 5, it comprises cylindrical parts h1 and h1 ', inner flanges h2 and h2', and skirt parts h3 and h3 '. The nuts 30 are fitted over the inner circumferences of the pair of skirt portions h3, h3 'of the adjacent header forming portions 11a1, 11b1 and the male screw portions 31a, 31a provided on the outer circumferences of the pair of fasteners 31, 31'. ′ Is screwed onto the female screw 30a on the inner circumference of the nut 30 from the side of the inner flanges h2 and h2 ′ which are integrally provided on the pair of skirts h3 and h3 ′, respectively. On the outer periphery of the central portion of the nut 30 in the axial direction, a protrusion 30b is provided around the pair of skirt portions h3 and h3 ', which are interposed between the opposed tip portions of the skirt portions h3 and h3'. Pair of fasteners 31, 31
Outer flanges 31b and 31b 'are formed at the rear end portion of the outer ring', and these outer flanges 31b and 31b 'are formed integrally with the pair of skirt portions h3 and h3'.
2, facing h2 'from the inside.

Between the outer flanges 31b, 31b 'of the pair of fasteners 31, 31' and the inner flanges h2, h2 'facing the outer flanges, and between the nut 30 and the skirt portions h3, h3'. Sealing material S is filled in each space, and a pair of skirts h3 is formed by a pair of fasteners 31, 31 '.
, H3 'are tightened in a direction in which they are pulled toward each other, and the adjacent ends of the skirt portions h3, h3' of the pair are abutted against the projection 30b on the outer periphery of the nut 30.

As the sealing material S, a liquid or pasty sealing material used in general piping work can be used.

In this example, the nut 30 and the pair of fasteners 3
1, 31 'form a fastening means for fastening the adjacent header forming portions of the adjacent heat dissipation panels.

FIG. 7 shows a fourth modified example of the fastening structure of the header forming portion which can be adopted in the present invention. Also in this example,
The header forming portions 11a1 and 11b1 of the adjacent heat radiating panels are composed of tubular portions h1 and h1 ', inner flanges h2 and h2' and skirt portions h3 and h3 ', respectively, as in the example shown in FIG. In the example of FIG. 7, an annular pressing ring 35 is fitted over the outer circumference of each pair of skirts, and each pair of tightening rings 3 is fitted to the inner circumference of each pair of skirts h3, h3 '.
6, 36 'are fitted.

In this example, the pair of skirts h3 and h3 '
The inner peripheral surface 35a on one end side and the inner peripheral surface 35a 'on the other end side of the pressing ring 35 that surrounds one and the other respectively increase their inner diameters toward the one end side and the other end side of the pressing ring 35, respectively. The taper surface is inclined like this. Also, a pair of tightening rings 3 fitted to one and the other of the pair of skirts h3 and h3 ', respectively.
The outer peripheral surfaces of 6, 36 'are tapered surfaces which are inclined in the same direction as the corresponding tapered surfaces 35a, 35a' of the pressing ring 35. Then, a plurality of screws 37 screwed into the screw holes provided in the tightening ring 36 are provided at equal angular intervals through holes provided through the tightening ring 36 ′, and these screws 37 form a pair of screws. Tightening ring 3
6, 36 'are tightened in a direction in which they are pulled toward each other, so that the skirt portions h3 of the pair of header forming portions,
h3 'is the tapered surface 35a, 35 of the inner circumference of the presser ring 35.
It is fastened in a state of being sandwiched between a'and the tapered surfaces on the outer circumferences of the tightening rings 36, 36 '. In this example, the pressing ring 35, the tightening rings 36, 36 ', and the screw 37 constitute a fastening means for fastening the adjacent header forming portions.

FIGS. 8A and 8B show a fifth modified example of the fastening structure of the adjacent header forming portions, and in this example, the upper header forming portions 11a1 and 11b1 respectively dispose the heat radiation panel. Cylindrical parts h1 and h1 'projecting from the plate surfaces of the metal plates 11a and 11b to be formed, and an annular intermediate inner flange h21, h projecting radially inward from the tip of the cylindrical part h1.
21 'and the cylindrical portions h1, h from the inner peripheral portion of the intermediate inner flange.
Cylindrical skirts h3 and h3 'that project to the opposite side from 1'
And the end inner flanges h22 and h22 ', which project inward in the radial direction from the tips of the skirts h3 and h3', are integrally formed, and adjacent header forming portions 11a of the heat radiation panels of each pair are formed.
The end inner flanges h22 and h22 'of the pair of 1 and 11b1 are arranged to face each other in the axial direction.

In the example of FIG. 8, a pair of nuts 41, 41 'are fitted on the inner circumferences of the pair of skirts h3, h3' of the adjacent header forming portions, and are provided on the outer circumference of the tubular fastener 42. The male screw portion 42a is screwed into the female screw portions 41a, 41a 'on the inner circumference of the pair of nuts 41, 41'. The pair of nuts 41, 41 'are provided with an outer flange 4 at the rear end portion of each.
1b and 41b ', and these outer flanges have skirt portions h3, to which nuts 41 and 41' are fitted, respectively.
Intermediate inner flanges h21, h integrally provided with h3 '
It is abutted against 21 'from the inside. A pair of nuts 41,
The female screw portions 41a, 41a 'of 41' are provided so as to have a reverse thread relationship with each other, and the fasteners 42 are tightened in a direction in which the pair of nuts 41, 41 'are pulled toward each other, so that the nuts of each pair are adjacent to each other. Adjacent header forming portions 11a1 and 11b1 are fastened with the pair of end inner flanges h22 and h22 'sandwiched between the end portions.

The preferred embodiments of the present invention have been described above. The main embodiments of the invention described in the specification of the present application are as follows.

(1) A plurality of heat dissipation panels having oil passages inside are arranged side by side in a horizontal direction with their plate surfaces parallel, and the upper and lower parts of the plurality of heat dissipation panels are respectively an upper header and a lower header. In a heat radiator for oil-filled electrical equipment connected via an oil radiating panel, each heat radiating panel has two metal plates having an upper header forming portion and a lower header forming portion integrally formed in an upper portion and a lower portion, respectively. It consists of two metal plates joined together by tightening the edges.
The upper header forming portion and the lower header forming portion of each heat radiating panel are cylindrical portions protruding from the plate surfaces of the two metal plates forming each heat radiating panel, and radially inward from the tip of each tubular portion. The protruding inner flange is integrally formed, and each two adjacent heat radiation panels are used as a pair of heat radiation panels. The inner flanges of the upper header forming portion and the inner flanges of the lower header forming portion of each pair of heat radiation panels are connected to each other. Each pair of inner flanges are opposed to each other, and the pair of retaining plates are arranged inside each pair of inner flanges.The retaining plates of each pair are fastened to each other by screws so that the retaining plates of each pair are located between each pair of retaining plates. The upper header and the lower header are respectively fastened with the flanges sandwiched therebetween, and the upper header and the lower header which are fastened to each other of the plurality of heat dissipation panels respectively constitute the upper header and the lower header. Radiator for the oil-filled electrical apparatus according to claim.

(2) A plurality of heat radiating panels having oil passages inside are arranged side by side in a horizontal direction with their plate surfaces parallel, and the upper and lower parts of the plurality of heat radiating panels are respectively an upper header and a lower header. In a heat radiator for oil-filled electrical equipment connected via an oil radiating panel, each heat radiating panel has two metal plates having an upper header forming portion and a lower header forming portion integrally formed in an upper portion and a lower portion, respectively. It consists of two metal plates joined together by tightening the edges.
The upper header forming portion and the lower header forming portion of each heat radiating panel are cylindrical portions protruding from the plate surfaces of the two metal plates forming each heat radiating panel, and radially inward from the tip of each tubular portion. The protruding inner flange is integrally formed, and each two adjacent heat radiation panels are used as a pair of heat radiation panels. The inner flanges of the upper header forming portion and the inner flanges of the lower header forming portion of each pair of heat radiation panels are connected to each other. The first fasteners, which are arranged as opposed to each other as inner flanges of each pair and have male threads on the outer circumference, are arranged so as to penetrate through the inner side of the inner flanges of each pair, and the second fastener having female threads on the inner circumference. Fasteners are disposed on one side of each pair of inner flanges
A female thread of the fastener is screwed into a male thread of the first fastener, and the first and second fasteners have outer flanges that face each other with the inner flange of the pair in between. The adjacent header forming portions of the pair of heat radiation panels are fastened with the pair of inner flanges sandwiched between the outer flanges of the first and second fasteners, and the plurality of heat radiation panels are fastened to each other. A radiator for oil-filled electrical equipment, wherein the upper header forming portion and the lower header forming portion respectively configure the upper header and the lower header.

(3) A plurality of heat radiating panels having oil passages inside are arranged side by side in the horizontal direction with their plate surfaces parallel, and the upper and lower parts of the plurality of heat radiating panels are respectively an upper header and a lower header. In a heat radiator for oil-filled electrical equipment connected via an oil radiating panel, each heat radiating panel has two metal plates having an upper header forming portion and a lower header forming portion integrally formed in an upper portion and a lower portion, respectively. It consists of two metal plates joined together by tightening the edges.
The upper header forming portion and the lower header forming portion of each heat radiating panel are cylindrical portions protruding from the plate surfaces of the two metal plates forming each heat radiating panel, and radially inward from the tip of each tubular portion. A projecting inner flange and a tubular skirt portion projecting from the inner peripheral portion of the inner flange to the side opposite to the tubular portion are integrally formed, and two adjacent heat radiation panels are used as a pair of heat radiation panels. The skirt portions of the adjacent upper header forming portions and the skirt portions of the adjacent lower header forming portions of each pair of heat dissipation panels are axially opposed to each other as a pair of skirt portions, and the inner circumference of each pair of skirt portions is arranged. A pair of nuts are fitted to each of the pair, and a tubular fastener having an external thread portion on the outer circumference is provided, and the external thread portion of the fastener is screwed to the female thread on the inner circumference of the pair of nuts. Opposite ends of the nut The nuts of the pair are fixed to the corresponding skirts by crimping so as to wrap around the ends of the corresponding skirts, and the nuts of the pair are provided integrally with the skirts to which they are fitted. The inner flange has an outer flange abutted from the inside, and the female thread portions of the pair of nuts are provided so as to have a reverse thread relationship with each other. The header forming portions adjacent to each other of the pair of heat radiation panels are fastened by being tightened in a direction in which they are attracted to each other,
A radiator for oil-filled electrical equipment, wherein the upper header forming portion and the lower header forming portion of the plurality of heat radiation panels, which are fastened to each other, constitute the upper header and the lower header, respectively.

(4) A plurality of heat radiating panels having oil passages inside are arranged side by side in a horizontal direction with their plate surfaces parallel, and the upper and lower parts of the plurality of heat radiating panels are respectively an upper header and a lower header. In a heat radiator for oil-filled electrical equipment connected via an oil radiating panel, each heat radiating panel has two metal plates having an upper header forming portion and a lower header forming portion integrally formed in an upper portion and a lower portion, respectively. It consists of two metal plates joined together by tightening the edges.
The upper header forming portion and the lower header forming portion of each heat radiating panel are cylindrical portions protruding from the plate surfaces of the two metal plates forming each heat radiating panel, and radially inward from the tip of each tubular portion. A projecting inner flange and a tubular skirt portion projecting from the inner peripheral portion of the inner flange to the side opposite to the tubular portion are integrally formed, and two adjacent heat radiation panels are used as a pair of heat radiation panels. The skirt portions of the adjacent upper header forming portions and the skirt portions of the adjacent lower header forming portions of each pair of heat dissipation panels are axially opposed to each other as a pair of skirt portions, and the inner circumference of each pair of skirt portions is arranged. From the inner flange side where the nut is fitted over the ridge and a pair of fasteners having an external thread portion is provided on the outer periphery, and the pair of fasteners are integrally provided on the skirt portions of each pair, respectively. Screw on the nut And a protrusion interposed between the opposite ends of the pair of skirts is provided around the outer periphery of the nut, and the pair of fasteners is provided inside the inner flange integrally provided with the pair of skirts. Sealing members are respectively filled between the outer flange of the pair of fasteners and the inner flange facing the outer flange, and between the nut and the pair of skirts. The pair of fasteners tightens the pair of skirts in a direction in which the pair of skirts are attracted to each other, and adjacent ends of the pair of skirts are abutted against the protrusions on the outer circumference of the nut to fasten the plurality of heat dissipation panels to each other. A radiator for oil-filled electrical equipment, wherein the upper header forming portion and the lower header forming portion respectively configure the upper header and the lower header.

(5) A plurality of heat radiating panels having oil passages inside are arranged side by side in a horizontal direction with their plate surfaces parallel, and the upper and lower parts of the plurality of heat radiating panels are respectively an upper header and a lower header. In a heat radiator for oil-filled electrical equipment connected via an oil radiating panel, each heat radiating panel has two metal plates having an upper header forming portion and a lower header forming portion integrally formed in an upper portion and a lower portion, respectively. It consists of two metal plates joined together by tightening the edges.
The upper header forming portion and the lower header forming portion of each heat radiating panel are cylindrical portions protruding from the plate surfaces of the two metal plates forming each heat radiating panel, and radially inward from the tip of each tubular portion. A projecting inner flange and a tubular skirt portion projecting from the inner peripheral portion of the inner flange to the side opposite to the tubular portion are integrally formed, and two adjacent heat radiation panels are used as a pair of heat radiation panels. , The skirt portions of the adjacent upper header forming portions and the skirt portions of the adjacent lower header forming portions of each pair of heat dissipation panels are axially opposed to each other as a pair of skirt portions, and are arranged on the outer circumference of each pair of skirt portions. An annular pressing ring is fitted across the pressing ring, and a pair of tightening rings are fitted to the inner circumferences of the pair of skirts, and the pressing ring surrounds one and the other of the pair of skirts. The inner peripheral surface on the one end side and the inner peripheral surface on the other end side are tapered surfaces that are inclined so that the inner diameter gradually increases toward the one end side and the other end side of the pressing ring, respectively, and the pair of skirt portions. The outer peripheral surfaces of the pair of tightening rings fitted to one side and the other side are tapered surfaces that are inclined in the same direction as the corresponding tapered surfaces of the pressing ring, and the pair of tightening rings are pulled together by a screw. And the header forming portions of the heat radiating panels of each pair are fastened together, and the upper header forming portion and the lower header forming portion of the plurality of heat radiating panels are fastened to each other to form the upper header and the lower header, respectively. A radiator for oil-filled electrical equipment that is characterized by being

(6) A plurality of heat dissipation panels having oil passages inside are arranged side by side in a horizontal direction with their plate surfaces parallel, and the upper and lower parts of the plurality of heat dissipation panels are respectively an upper header and a lower header. In a heat radiator for oil-filled electrical equipment connected via an oil radiating panel, each heat radiating panel has two metal plates having an upper header forming portion and a lower header forming portion integrally formed in an upper portion and a lower portion, respectively. It consists of two metal plates joined together by tightening the edges.
The upper header forming portion and the lower header forming portion of each heat radiating panel are cylindrical portions protruding from the plate surfaces of the two metal plates forming each heat radiating panel, and radially inward from the tip of each tubular portion. A protruding intermediate inner flange, a cylindrical skirt portion protruding from the inner peripheral portion of the intermediate inner flange to the side opposite to the cylindrical portion, and an end inner flange protruding inward in the radial direction from the tip of the skirt portion. And two adjacent heat dissipation panels as a pair of heat dissipation panels, the end inner flanges of the adjacent upper header forming parts and the end inner flanges of the adjacent lower header forming parts of the pair of heat dissipation panels are connected to each other. Are axially opposed to each other as inner flanges of each pair, nuts of each pair are fitted to the inner circumferences of the skirts of each pair, and a fastener having a male screw portion on the outer circumference is provided, Conclusion Male threads are screwed into female threads on the inner circumference of the pair of nuts, and the nuts of the pair are brought into contact with the inner inner flanges integrally provided with the skirts to which they are fitted from the inside. The paired nuts are provided so as to have a reverse thread relationship with each other, and the fasteners are tightened in a direction in which the paired nuts are pulled toward each other, and Adjacent header forming portions of each pair of heat radiating panels are fastened in a state in which a pair of end inner flanges are sandwiched between adjacent end portions of the nut, and the upper header forming portions fastened to each other of the plurality of heat radiating panels and A radiator for oil-filled electrical equipment, wherein the upper header and the lower header are configured by the lower header forming portion, respectively.

[0079]

As described above, according to the present invention, the peripheral portions of two metal plates are joined by winding to form each heat dissipation panel, and the upper header forming portion integrally provided on the metal plate. Since the upper header and the lower header are configured by fastening the lower header forming portion and the lower header forming portion by fastening means using screws, respectively, the radiator can be assembled without tedious welding that requires skill and manufacturing of the radiator. Can be facilitated.

Further, according to the present invention, since welding is not performed when assembling the radiator, not only the heat radiation panel can be prevented from being distorted or deformed by thermal strain, but also the inside of the heat radiation panel can be weld sputtered. It can be prevented from being contaminated by the like. Therefore, the work of correcting the shape of each part of the heat dissipation panel can be omitted, and the cleaning of the inside of the heat dissipation panel can be omitted by performing the assembling work in a clean room.

Furthermore, according to the present invention, since the peripheral edge of the metal plate is connected by winding, the cut surface of the edge of the metal plate is not caught inside and exposed to the outside. Therefore, by using a metal plate having a protective coating applied beforehand as the metal plate constituting the heat radiating panel, the protective coating of the heat radiating panel after assembling the radiator can be omitted, and the manufacturing efficiency can be improved.

Further, according to the present invention, since it is not necessary to perform welding for connecting the heat radiation panels to each other, the weldability is not taken into consideration and within a limit necessary to obtain a predetermined mechanical strength and rigidity. The thickness of the metal plate forming the heat dissipation panel can be reduced, and the weight of the radiator can be reduced and the material cost can be reduced.

Further, according to the present invention, since the peripheral edge portions of the two metal plates constituting the heat dissipation panel are joined by tightening by winding,
It is possible to prevent a gap from being formed on the outer surface of the peripheral portion of the heat dissipation panel and to completely apply protective coating to the joint portion of the peripheral portion of the heat dissipation panel.

[Brief description of drawings]

FIG. 1A is a front view showing a part of a radiator of this embodiment. (B) omits a part of the radiator of the embodiment,
It is the side view which showed one part by the cross section.

FIG. 2A is a partial cross-sectional view of a heat dissipation panel used in the same embodiment, and FIG. 2B is an enlarged cross-sectional view of a caulking portion of the heat dissipation panel.

3A is a sectional view of a main part showing a fastening structure between header forming parts of adjacent heat dissipation panels of the heatsink of the embodiment of FIG. 1, and FIG. 3B is a heatsink of the embodiment of FIG. FIG. 4 is a cross-sectional view of relevant parts showing a fastening structure between a header forming portion and an end header tube of the heat dissipation panel.

FIG. 4A is a sectional view of a main part showing a modified example of a fastening structure between header forming parts of adjacent heat dissipation panels of a radiator according to the present invention, and FIG. 4B is a header forming part and an end of the heat dissipation panel. It is a principal part sectional view which showed the modification of the fastening structure with a part header pipe.

FIG. 5A is a sectional view of a main part showing another modified example of the fastening structure between the header forming parts of the adjacent heat dissipation panels of the radiator according to the present invention, and FIG. 5B is a main part of FIG. It is an expanded sectional view.

FIG. 6 is a sectional view of a main part showing still another modified example of the fastening structure between the header forming parts of the adjacent heat dissipation panels of the heat radiator according to the present invention.

FIG. 7 is a main part sectional view showing still another modified example of the fastening structure between the header forming parts of the adjacent heat dissipation panels of the heat radiator according to the present invention.

FIG. 8A is a sectional view of a main part showing still another modified example of the fastening structure between the header forming parts of the adjacent heat dissipation panels of the radiator according to the present invention, and FIG. 8B is the main part of FIG. FIG.

FIG. 9 is a sectional view of a main part of a conventional radiator.

FIG. 10 is a cross-sectional view of a heat dissipation panel used in a conventional radiator.

FIG. 11 is a perspective view showing a part of a lower portion of a conventional radiator.

[Explanation of symbols]

 11 Heat dissipation panel 11a, 11b Metal plate 11a1, 11b1 Upper header forming part 11a2, 11b2 Lower header forming part 12, 12 'Holding plate 14 Screw 15, 16 End header pipe 17 Upper header 18 Lower header p Winding part 21 1st 21a Male screw 21b Outer flange 22 Second fastener 22a Female screw 22b Outer flange 23,23 'Nut 23c, 23c' Outer flange 25 Fastener 30 Nut 30b Protrusion 31, 31 'Fastener 31b, 31b' Outer Flange 35 Presser ring 35a, 35a 'Tapered surface 36, 36' Tightening ring 37 Screw 41, 41 'Nut 41b, 41b' Outer flange 42 Fastener h1, h1 'Cylindrical part h2, h2' Inner flange h3, h3 'Skirt Part h21, h21 'Intermediate inner flange h22, h22' End inner flange

Claims (7)

[Claims] 1. A plurality of heat radiating panels having oil passages inside are arranged side by side in a horizontal direction with their plate surfaces in parallel, and the upper and lower parts of the plurality of heat radiating panels are respectively provided with an upper header and a lower header. In the radiator for oil-filled electrical equipment connected via the above, each heat dissipation panel has two metal plates that integrally have a cylindrical upper header forming portion and a lower header forming portion at the upper and lower portions, respectively. The corresponding header forming parts are arranged opposite to each other with the protruding parts facing each other, and the peripheral edges of the two metal plates are joined together by winding. As a panel
The upper header forming portion and the lower header forming portion of each pair of heat radiation panels are fastened together by fastening means using screws to couple a plurality of heat radiation panels to each other, and the plurality of heat radiation panels are coupled to each other at an upper portion. A radiator for oil-filled electrical equipment, wherein the header forming portion and the lower header forming portion respectively configure the upper header and the lower header. 2. Each of the upper header forming portion and the lower header forming portion protrudes from a plate surface of a metal plate forming the heat dissipation panel, and a tip of the cylindrical portion protrudes radially inward. The inner flange and the inner flange are integrally formed, and the inner flanges of a pair of adjacent upper header forming portions of each pair of heat dissipation panels and the inner flanges of a pair of adjacent lower header forming portions are arranged so as to face each other. The means is characterized by comprising a pair of holding plates which are formed in an annular shape and are arranged to face each other so as to sandwich the inner flanges of each pair, and a screw which fastens the holding plates of each pair to each other. The radiator for an oil-filled electric device according to claim 1. 3. Each of the upper header forming portion and the lower header forming portion protrudes from a plate surface of a metal plate forming the heat dissipation panel, and a radially inward projecting end of the cylindrical portion. The inner flange and the inner flange are integrally formed, and the inner flanges of a pair of adjacent upper header forming portions of each pair of heat dissipation panels and the inner flanges of a pair of adjacent lower header forming portions are arranged so as to face each other. The means includes a tubular first fastener arranged with an external thread on its outer circumference and penetrating the inside of each pair of inner flanges, and an internal thread on the inner circumference of each pair of inner flanges. A second fastener screwed on one side to a male screw of the first fastener, the first and second fasteners being opposite outer flanges with the inner flange of the pair in between. Has
The heat radiator for oil-filled electrical equipment according to claim 1, wherein the first and second fasteners are fastened with a pair of inner flanges sandwiched between outer flanges. 4. Each of the upper header forming portion and the lower header forming portion protrudes from a plate surface of a metal plate forming the heat dissipation panel, and protrudes radially inward from a tip end of the cylindrical portion. A pair of adjacent upper header forming portions of each pair of heat dissipation panels integrally having an inner flange and a tubular skirt portion projecting from the inner peripheral portion of the inner flange to the opposite side to the tubular portion. The skirt portions and the pair of skirt portions of the adjacent lower header forming portions are axially opposed to each other, and the fastening means includes a pair of nuts fitted to the inner circumference of each pair of skirt portions and an outer circumference. A tubular fastener having a male threaded portion on which the male threaded portion is screwed into the female threaded portion on the inner circumference of the pair of nuts, and the opposite ends of the paired nuts correspond to each other. The crimp is crimped so as to wrap around the end of the skirt. The pair of nuts are fixed to the corresponding skirts by the parts, and the pair of nuts each have an outer flange that is abutted from the inside with an inner flange integrally provided with the skirt into which the nuts are fitted. The female threaded portions of the pair of nuts are provided so as to have a reverse threaded relationship with each other, and the fasteners are tightened in a direction in which the paired nuts are pulled toward each other. Heat sink for the oil-filled electrical equipment described. 5. Each of the upper header forming portion and the lower header forming portion protrudes from a plate surface of a metal plate forming the heat dissipation panel, and a tip of the cylindrical portion protrudes radially inward. A pair of adjacent upper header forming portions of each pair of heat dissipation panels integrally having an inner flange and a tubular skirt portion projecting from the inner peripheral portion of the inner flange to the opposite side to the tubular portion. Skirt portions and adjacent skirt portions of the lower header forming portion are arranged so as to face each other in the axial direction, and the fastening means includes a nut fitted over the inner circumference of each pair of skirt portions and the outer circumference. It comprises a pair of fasteners screwed to the nut from the inner flange side which is provided integrally with each pair of skirt portions having a male screw portion, and the pair of skirt portions is provided on the outer periphery of the nut. Protrusions between the opposite ends of the Circumferentially, the pair of fasteners has an outer flange opposed from the inside to an inner flange integrally provided with the pair of skirt portions, and faces the outer flange of the pair of fasteners and the outer flange. The sealing material is filled between the inner flange and the inner skirt and between the nut and the pair of skirts, and the pair of fasteners tightens the pair of skirts in a direction in which the pair of skirts are pulled toward each other. The radiator for an oil-filled electric device according to claim 1, wherein adjacent ends are abutted against protrusions on the outer circumference of the nut. 6. Each of the upper header forming portion and the lower header forming portion has a tubular portion protruding from a plate surface of a metal plate constituting the heat dissipation panel, and a radially inner portion protruding from a tip end of the tubular portion. A pair of adjacent upper header forming portions of each pair of heat dissipation panels integrally having an inner flange and a tubular skirt portion projecting from the inner peripheral portion of the inner flange to the opposite side to the tubular portion. Skirt portions and the pair of skirt portions of adjacent lower header forming portions are arranged to face each other in the axial direction, and the fastening means is an annular pressing ring fitted over the outer circumference of each pair of skirt portions, A pair of tightening rings fitted to the inner circumference of each pair of skirts, and a screw for tightening the pair of tightening rings in a direction to draw the tightening rings together, and surrounding one and the other of the pair of skirts, respectively. Push The inner peripheral surface on one end side and the inner peripheral surface on the other end side of the ring are tapered surfaces inclined so that the inner diameter gradually increases toward the one end side and the other end side of the pressing ring, respectively. 2. The outer peripheral surfaces of a pair of tightening rings fitted respectively to one and the other of the skirt portions are formed as tapered surfaces inclined in the same direction as the corresponding tapered surfaces of the pressing ring. Heat sink for the oil-filled electrical equipment described. 7. Each of the upper header forming portion and the lower header forming portion has a cylindrical portion protruding from a plate surface of a metal plate forming the heat dissipation panel, and radially inward from a tip of the cylindrical portion. An intermediate inner flange, a tubular skirt portion projecting from the inner peripheral portion of the intermediate inner flange to the opposite side of the tubular portion, and an end inner flange projecting radially inward from the tip of the skirt portion are integrally provided. And, the end inner flanges of the pair of adjacent upper header forming portions of each pair of heat dissipation panels and the end inner flanges of the pair of adjacent lower header forming portions are arranged so as to face each other in the axial direction, and the fastening means is A pair of nuts fitted to the inner circumference of each pair of skirts, and a tubular shape having a male screw portion on the outer circumference, and the male screw portion is screwed into the female screw portion of the inner circumference of the pair of nuts. Fasteners, each pair of nuts Has an outer flange that is abutted from the inside with an intermediate inner flange that is integrally provided with the fitted skirt portion, and the female screw portions of the pair of nuts are provided so as to have a reverse screw relationship with each other. 2. The pair of nuts are tightened by the fastener in a direction in which the nuts are pulled toward each other, and the inner flanges of the pair of end portions are sandwiched between adjacent end portions of the nuts of each pair. The radiator for oil-filled electrical equipment described in.