JP2009081171A - Cubicle heat-radiation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cubicle heat-radiation structure capable of effectively radiating heat even when a clearance is small between cubicle walls and a heat radiator of an electric apparatus built in the cubicle. <P>SOLUTION: A cubicle heat-radiation structure includes, in the casing 1 that constitutes a cubicle, an electric apparatus 2 that has a heat radiator 6, wherein the heat radiator 6 is disposed opposite to the wall surfaces 1a of the casing 1 to radiate heat from the electric apparatus 2 to the outside. The heat radiator 6 comprises an upper header 7 horizontally protruding from the upper part of the container 4 of the electric apparatus 2, a lower header 8 horizontally protruding from the lower part of the container 4 and tilting upward halfway, and a plurality of heat radiation fins 9 vertically communicating between upper and lower headers. Air intake ports 10a and 10b are provided on the wall 1a of the adjacent casing 1 opposite to the lower header 8. An air outlet port 11 is provided on the adjacent wall 1a opposite to the upper header 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cubicle heat dissipation structure that efficiently dissipates heat generated by electrical equipment housed in a cubicle.

In conventional cubicle type power distribution facilities, etc., in order to release the heat generated by the electrical equipment in the cubicle to the outside, the heat generated inside the casing is circulated by independently circulating the air inside and outside the casing. For example, a heat exchanger structure as shown in FIG. 7 is disclosed. (A) is side surface sectional drawing, (b) is a plane sectional view of the heat exchanger seen from bb of (a).
In FIG. 7, a partition wall 32 that partitions the inside is provided in a sealed casing 31, and the partition wall 32 is divided into a device chamber 33 that houses an electronic device or the like and a heat exchange chamber 35 that houses a heat exchanger 34. Are provided with an inside air exhaust port 36 and an inside air intake port 37. The inside air 38 on the side of the equipment chamber 33 that has been warmed by heat generated by electronic equipment or the like is introduced into the heat exchanger 34 through the inside air exhaust port 36, passes through the heat exchanger 34, finishes the heat exchange, and passes through the inside air intake port 37. It is returned to the equipment room 33 and circulated again. The heat exchanger 34 is formed with an inside air side passage 39 and an outside air side passage 40, as shown in the plane sectional view of FIG. 5B, and in the heat exchange chamber 35, the outside air 42 taken in from the outside air inlet 41 is received. The outside air 42 introduced into the passage 40 on the outside air side and having exchanged heat with the inside air 38 is discharged from the exhaust port 43 to the outside of the casing 31.

JP-A-11-145660 (page 3, FIGS. 4 and 5)

The cubicle is usually restricted in size and restricted in relation to the installation location and other devices attached thereto, but it is desirable that the cubicle be as compact as possible in order to reduce the installation area. In cubicles with built-in electrical equipment that requires a heat exchanger, the size of the electrical equipment inevitably increases, but due to the size of the housing, there is a gap between the heat exchanger and the housing wall of the cubicle. It will be suppressed as much as possible.
In the conventional heat exchanger structure as shown in Patent Document 1, when the space between the heat exchanger 34 and the wall surface of the housing 31 is narrowed, the gap between the outside air inlet 41 and the heat exchanger 34 at the bottom of the wall surface is also narrowed. In addition, since the space near the intake port 41 that is the outside air introduction portion below the heat exchanger 34 is narrowed, it is difficult to take in the outside air 42 and cooling efficiency is deteriorated.
If the electrical equipment built into the cubicle is a device that generates a large amount of heat, such as a transformer, for example, the heat sink, which is a heat exchanger, will increase in size, so if you try to reduce the size of the cubicle, There was a problem that the space between the wall surface and the radiator was further sacrificed, and the conditions were severe for cooling.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a cubicle cooling structure having an excellent heat dissipation effect even when the gap between the wall surface of the cubicle casing and the radiator is small. And

  The cubicle heat dissipating structure according to the present invention is a housing in which a main unit device and a cooling medium are housed in a container, and an electric device including a heat radiator that circulates and cools the cooling medium is provided outside the container. In the heat dissipation structure of the cubicle configured to dissipate heat generated from the electrical equipment to the outside of the housing, the radiator is disposed so as to face the wall surface of the housing, An upper header that communicates with the upper part of the side of the container and protrudes in the horizontal direction, a lower header that communicates with the lower part of the side of the container and protrudes in the horizontal direction and is bent so as to incline upward from the middle, and between the headers A plurality of radiating fins that communicate with each other in the vertical direction to form a cooling medium flow path, and an air inlet is provided on the wall surface of the housing in the vicinity facing the lower header and faces the upper header One in which the exhaust port is provided on the wall of the neighbor.

  In addition, the radiator is connected to the upper part of the side of the container and protrudes in the horizontal direction. The lower header is connected to the lower part of the side of the container and protrudes in the horizontal direction. A plurality of radiating fins that communicate with each other to form a flow path for the cooling medium, and the radiating fins have different lengths. The upper headers are alternately arranged on the side with the same height, and the inlet is provided on the wall of the housing near the lower header, and the exhaust is provided on the wall near the upper header. is there.

  According to the cubicle heat dissipation structure of the present invention, the lower header of the radiator provided in communication with the lower part of the side surface of the container of the electrical equipment is formed by bending in a horizontal direction so as to incline upward from the middle, Since the air inlet is provided on the wall of the housing near the lower header, a space is formed on the lower side of the radiator that expands toward the wall of the housing. The outside air taken in through the air efficiently flows into the gaps between the radiating fins lined up from the near side when viewed from the wall surface, and the cooling efficiency of the radiator can be improved. Therefore, even when the gap between the wall surface of the housing and the radiator is narrow, it is possible to provide a cubicle having an excellent heat dissipation effect.

  In addition, the radiator is composed of two types of radiators with different radiating fin lengths, and a plurality of two types of radiators are arranged alternately with the height of the upper header aligned on the side of the container, Since the air inlet is provided on the wall of the housing near the header, the outside air that flows in from the air inlet passes through the lower space formed by the difference in the length of the radiator, and the radiator on the upper and both sides Therefore, the cooling efficiency of the radiator can be improved, and a cubicle having an excellent heat radiation effect can be provided.

Embodiment 1 FIG.
1 is a side sectional view showing a cooling structure of a cubicle according to Embodiment 1 of the present invention, FIG. 2 is a partially enlarged sectional view of a radiator indicated by a chain line II in FIG. 1, and FIG. 3 is a thick arrow III in FIG. FIG. 4 is an enlarged sectional view of only one radiating fin viewed from the direction indicated by the arrow IV-IV in FIG.

  First, an overview of the entire cubicle will be described. A cubicle is a package in which power distribution facilities and the like are housed compactly in a housing, and basically includes a housing and electrical equipment housed in the housing. In the present embodiment, a transformer having a particularly large calorific value will be described as an example of an electric device.

  As shown in FIG. 1, a transformer 2 is accommodated as an electrical device in a housing 1 constituting a cubicle. The transformer 2 circulates a main body device 3 comprising an iron core, high and low voltage coils, wiring parts, and the like, constituting a main body of an electric device, a container 4 for housing them, and a cooling medium 5 sealed in the container 4, And a radiator 6 that dissipates heat generated by the main device 3. Details of the radiator 6 will be described later. As the cooling medium 5, in the case of a transformer, the amount of heat generated is large, and therefore insulating oil is usually used. Insulating oil is a cooling medium, and also plays a role of insulation between main equipments 3 such as iron cores and coils, or between them and the container 4.

In order to transmit and receive electric power to the built-in coil, the container 4 is provided with a bushing or the like, but since it is not a main part of the present invention, illustration and description are omitted.
In addition to the transformer 2, instruments and other devices are also housed in the housing 1, but these are not the main part of the present invention, so illustration and description are omitted.

The cubicle is desirably as compact as possible in order to reduce the installation area. In the case of a cubicle in which a transformer is accommodated as an electrical device, a transformer with a radiator occupies a large space. In addition, since the transformer generates a large amount of heat, consideration must be given to efficient heat dissipation.
Since it is necessary to release the heat radiation from the radiator 6 to the outside of the housing 1, the radiator 6 is usually provided on one side surface of the container 4 as shown in the figure. In order to make the casing 1 compact, the transformer 2 is arranged in the casing 1 so that the outer surface portion of the radiator 6 faces the wall surface 1a of the casing 1 and is positioned in the vicinity of the wall surface 1a. Place close to. As a result, the gap between the radiator 6 and the wall surface 1a is suppressed to be narrow.

Next, the structure of the radiator 6 will be described.
An upper header 7 having one end connected to the container 4 and the other end protruding in the horizontal direction is provided on the upper side of the container 4. A lower header 8 having one end connected to the container 4 and the other end protruding in the horizontal direction and bent so as to incline upward from the middle is provided at the lower side of the container 4. A plurality of heat dissipating fins 9 that communicate with each other in the vertical direction between the headers 7 and 8 to form a flow path of the cooling medium 5 are fixed to the longitudinal direction of the headers 7 and 8 at substantially equal intervals by welding or the like. Yes. That is, the radiator 6 is composed of upper and lower headers 7 and 8 and heat radiating fins 9.
FIG. 2 is an enlarged cross-sectional view of a portion II in FIG. 1, that is, a joint portion between the upper header 7 and the radiating fin 9, and as shown in the figure, the insulating oil as the cooling medium 5 is discharged from the upper header 7 to each radiating fin 9. It flows into the flow path 9b.

FIG. 3 is a front view of the radiator 6 as seen from the direction of arrow III in FIG. Since the lower header 8 is bent so as to incline upward as it approaches the wall surface 1a of the housing 1, the length of the radiating fin 9 is shortest on the side close to the wall surface 1a, and is perpendicular to the paper surface in FIG. The length gradually increases in the depth direction. This heat radiator 6 has a shape in which a plurality of heat radiating fins 9 are arranged in parallel to the wall surface 1a with the width surface of the heat radiating fin 9 facing the wall surface 1a.
The cross section (only one piece is shown) of the radiation fin 9 seen from the arrow IV-IV in FIG. 3 is as shown in FIG. That is, the periphery of the two thin steel plates 9a and several places in the width direction (two places in the figure) are seam welded, and the unwelded part is expanded to form the flow path 9b of the cooling medium 5. In addition, the structure of this radiation fin 9 is an example, and is not limited to this shape.

Next, returning to FIG. 1, the ventilation port of the housing 1 will be described. An air inlet for taking outside air into the housing 1 is provided on the wall surface 1 a of the housing 1 in the vicinity of the radiator 6 facing the lower header 8. In the figure, the air inlet 10a is provided on the side surface and the air inlet 10b is provided on the lower surface, but only one of them may be provided. It is desirable that the position of the air inlet 10 a provided in the side surface portion is on the lower side than the tip portion of the lower header 8.
In addition, an exhaust port 11 for exhausting the heated air in the housing 1 is provided on the wall surface 1 a in the vicinity facing the upper header 7. In order to form an efficient flow path, it is desirable that the position of the exhaust port 11 be slightly above the upper header 7.
A fan 12 for promoting exhaust is provided inside the exhaust port 11.

  Further, inside the housing 1, a space of a portion that accommodates the container 4 side of the transformer 2 and a space of a portion that accommodates the radiator 6 side are partitioned by a partition wall 13, one of which is an equipment room 14 and the other. Is the heat exchange chamber 15. In this case, one surface of the container 4 may be used as a part of the partition wall 13 as shown in the figure.

Next, the operation will be described.
The temperature of the main device 3, that is, the iron core and coil of the transformer rises due to energization. Thereby, the temperature of the cooling medium 5 (insulating oil) enclosed in the container 4 also rises, and the high-temperature cooling medium 5 moves to the upper part and flows into the radiating fins 9 from the upper header 7 of the radiator 6. Heat is exchanged with the outside air by the heat radiating fins 9, is cooled, and flows downward. Then, circulation is repeated so as to return to the inside of the container 4 via the lower header 8.
On the other hand, on the heat exchange chamber 15 side, an air flow path in which outside air flows into the heat exchange chamber 15 from the intake ports 10a and 10b and is discharged from the exhaust port 11 to the outside of the housing 1 by the operation of the fan 12. Is formed. The inflowing cold (outside temperature) air contacts the surface of the heat radiating fins 9 in the course of passing through the flow path, and exchanges heat, so that the temperature rise of the cooling medium 5 (insulating oil) becomes a specified value or less. I have to.

  Here, the feature of the present embodiment is that the lower header 8 is provided to be bent so that the tip side is inclined upward as it approaches the wall surface 1a, and the length of the radiation fins 9 is adjusted to the wall surface 1a. It is the point which comprised the heat radiator 6 by shortening as it approached. By doing so, a space 16 is formed on the lower side of the radiator 6 so as to expand toward the wall surface 1a. Since the intake ports 10a and 10b are provided on the wall surface 1a of the housing 1 in the vicinity facing the lower header 8, the intake ports 10a and 10b face the space 16, so the outside air taken in The cooling efficiency of the radiator 6 can be improved by efficiently flowing into the gaps between the radiating fins 9 arranged in the rear direction from the near side as viewed from 1a.

  This effect increases as the capacity of the transformer 2 increases. This is because as the capacity of the transformer 2 increases, the overall outer diameter shape increases and the amount of heat generation also increases. However, the cubicle housing 1 cannot be enlarged according to the size of the transformer 2 because of the limitation of the installation area and the like. Therefore, the distance between the radiator 6 and the wall surface 1a of the housing 1 is cut to the minimum necessary. Therefore, when there is no space 16 on the lower side of the radiator 6, the outside air from the intake port is radiated by the radiation fins. It becomes difficult to go around the gap 9 and the cooling efficiency is greatly reduced.

  Although the heat radiation fin 9 is shortened as it approaches the wall surface 1a, the heat radiation area is reduced as compared with the case where the heat radiation fin 9 is made the same length (according to the long part). As the difference in temperature rise is larger, the ratio that contributes to cooling is larger. Therefore, the structure of this embodiment is adopted because the cooling efficiency is reduced by shortening the part on the front side of the lower part of the radiating fin that contributes less to cooling. The effect of improving the cooling efficiency by doing is greater.

In the above description, the fan 12 is provided inside the exhaust port 11. However, the fan 12 is not necessarily required. The fan 12 may be omitted when the calorific value of the electrical device is small.
Further, the partition wall 13 is not necessarily required. However, when the partition wall 13 is present, the outside air taken into the heat exchange chamber 15 can be circulated efficiently. Further, if the partition wall 13 is provided, it is partitioned from the equipment room 14 side where many energized portions are exposed, so safety can be ensured during maintenance inspection of the heat exchange chamber 15.
Moreover, although the case of the transformer was demonstrated as the electric equipment 2 accommodated in the inside of the housing | casing 1, it is equivalent also in other static induction apparatuses, such as a transformer and a voltage regulator, Furthermore, it restricts to a static induction apparatus. The present invention can be applied to general electric equipment having a large amount of heat generation and having a radiator.
Furthermore, although the cooling medium is an insulating oil, a gas such as an insulating gas may be used. In that case, it is desirable to provide a circulation means for forcibly circulating the cooling medium in a part of the flow path on the main device side.

  As described above, according to the present embodiment, the radiator of the electric device is provided in communication with the upper part of the side surface of the container and protrudes in the horizontal direction, and is provided in communication with the lower part of the side surface of the container. And a lower header that is bent so as to incline upward from the middle, and a plurality of radiating fins that communicate with each other in the vertical direction to form a cooling medium flow path. Since the intake port is provided on the wall surface of the body and the exhaust port is provided on the wall surface in the vicinity of the upper header, a space is formed on the lower side of the radiator so as to expand toward the wall surface of the housing. Therefore, the outside air taken in from the outside of the housing through the intake port can efficiently flow into the gaps between the radiating fins lined up from the near side as viewed from the wall surface, and the cooling efficiency of the radiator can be improved. Therefore, even when the gap between the wall surface of the housing and the radiator is narrow, it is possible to provide a cubicle having an excellent heat dissipation effect.

  In addition, when the electrical equipment to be accommodated is a static induction device, it generates more heat and has a larger volume than other devices, so the heat sink and the wall surface of the housing are closer and the gap is narrower. By forming a space as described above on the lower side and securing a wide space for taking in outside air in the vicinity of the intake port, the effect of suppressing a decrease in cooling efficiency is great.

  In addition, since the cooling medium is an insulating oil, it can be efficiently cooled even in the case of an electric device having a large calorific value.

  Moreover, since the inside of the housing is partitioned by a partition into a space for accommodating the radiator and a space for accommodating the container of the electric device, the outside air taken into the heat exchange chamber side that accommodates the radiator is efficiently transferred to the outer surface of the radiator. It can be circulated. In addition, since the energized portion is not exposed in the heat exchange chamber, safety during maintenance and inspection of the heat exchange chamber can be ensured.

  Further, since the fan is provided at the exhaust port so as to forcibly exhaust the outside air sucked from the intake port, the intake and exhaust of the outside air are further promoted, and the heat exchange efficiency can be enhanced.

Embodiment 2. FIG.
5 is a side sectional view showing a cubicle cooling structure according to Embodiment 2 of the present invention, and FIG. 6 is a front view of the radiator viewed from the direction indicated by thick arrow VI in FIG. Parts equivalent to those in FIG. 1 of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Further, since the structure of the radiating fin of the radiator is the same as that of FIG. 2 and FIG. Hereinafter, the difference will be mainly described.

As shown in FIGS. 5 and 6, the main difference from the first embodiment is the shape of the radiator. The radiator is composed of two types of radiators 17 and 18 having different overall lengths. Each radiator has the same header shape at the top and bottom, and both the upper header 19 and the lower header 20 have one end connected to the side surface of the container 4 and the other end protruding in the horizontal direction. Yes. The headers 19 and 20 are connected by a plurality of radiating fins 21 or 22 having the same length.
These two types of radiators 17 and 18 are alternately arranged in the depth direction of the container 4 in FIG. 5, that is, in the direction perpendicular to the drawing, with the height of the upper header 19 aligned.
The front view of the heat radiators 17 and 18 seen from the direction of the thick arrow VI is as shown in FIG. Although FIG. 6 shows a case where there are five radiators, the present invention is not limited to this.

Next, the operation will be described.
Due to energization, the temperature of the electric body 3 (iron core, coil, etc.) rises, the temperature of the cooling medium 5 (insulating oil) enclosed in the container 4 also rises, and the high temperature of the cooling medium 5 moves upward to dissipate heat. The circulation is repeated from the upper header 19 of the chambers 17 and 18 to the heat radiation fins 21 and 22, cooled by being exchanged with external air and returned to the container 4 via the lower header 20.
On the other hand, on the heat exchange chamber 15 side, the operation of the fan 12 causes outside air to flow into the heat exchange chamber 15 of the housing 1 from the intake ports 10a and 10b and to be discharged out of the housing 1 from the exhaust port 11. An air flow path is formed, and heat exchange is performed in contact with the surfaces of the radiation fins 21 and 22 in the air circulation process, thereby suppressing the temperature rise of the cooling medium 5 to a specified value or less.
It should be noted that the position of the air inlet 10a provided on the side surface is desirably lower than the lower header 20 of the shorter radiator 18.

Here, by arranging the radiators 17 and 18 having different lengths alternately, as shown by arrows in FIG. 6, the outside air flowing into the intake port 10 a is caused by the difference in the lengths of the radiators 17 and 18. Through the space 23 formed in the lower part of the radiator, it is possible to efficiently flow into the gaps between the radiator fins 21 and 22 of the radiators on the upper side and the both sides. For this reason, the cooling efficiency of the heat radiators 17 and 18 improves.
In this case as well, as described in the first embodiment, although the heat radiation area is reduced by the amount of the heatsink, the cooling efficiency improvement by the wraparound from the space 23 part is better. Overall improvement in cooling efficiency can be expected.

  As described above, according to the present embodiment, the radiator of the electrical device is provided in communication with the upper part of the side surface of the container and protrudes in the horizontal direction, and is provided in communication with the lower part of the side surface of the container. It is composed of two types of radiators with a lower header projecting in the direction and a plurality of heat dissipating fins that communicate with each other in the vertical direction to form a flow path for the cooling medium, and the lengths of the heat dissipating fins are different. A plurality of two types of radiators are arranged alternately with the height of the upper header aligned on the side of the container, and an air inlet is provided on the wall surface of the housing near the lower header, facing the upper header Since the exhaust wall is provided in the wall near the outside, the outside air that has flowed in from the intake port passes through the lower space formed by the difference in the length of the radiator and dissipates heat from the upper and both radiators. Efficient flow into the fin gap Since it is, it is possible to improve the cooling efficiency of the radiator. Therefore, even when the gap between the wall surface of the housing and the radiator is narrow, it is possible to provide a cubicle having an excellent heat dissipation effect.

It is side surface sectional drawing which shows the cooling structure of the cubicle by Embodiment 1 of this invention. It is an expanded sectional view of the II section of FIG. FIG. 3 is a front view of the radiator viewed from the direction of arrow III in FIG. 1. It is sectional drawing of the radiation fin seen from the IV-IV direction of FIG. It is side surface sectional drawing which shows the cooling structure of the cubicle by Embodiment 2 of this invention. FIG. 6 is a front view of the radiator viewed from the direction of arrow VI in FIG. 5. It is side surface sectional drawing which shows the heat exchanger structure of the conventional cubicle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing | casing 1a Wall surface 2 Transformer (electrical equipment) 3 Main body equipment 4 Container 5 Cooling medium 6,17,18 Radiator 7,19 Upper header 8,20 Lower header 9,21,22 Radiation fin 9a Thin steel plate 9b Flow path 10a, 10b Intake port 11 Exhaust port 12 Fan 13 Bulkhead 14 Equipment room 15 Heat exchange room 16, 23 Space.

Claims (6)

An electrical device that houses a main body device and a cooling medium in a container and includes a radiator that circulates and cools the cooling medium outside the container is housed inside a casing that forms a cubicle, and the heat dissipation In the heat dissipation structure of the cubicle configured to dissipate heat generated from the electrical device to the outside of the housing, the device is disposed so as to face the wall surface of the housing,
The radiator is provided to communicate with the upper part of the side surface of the container and protrudes in the horizontal direction, and is provided to communicate with the lower part of the side surface of the container and protrudes in the horizontal direction and is bent so as to incline upward from the middle. A lower header and a plurality of heat dissipating fins that vertically communicate between the headers to form a flow path for the cooling medium, and an air inlet is provided in the wall surface of the casing in the vicinity of the lower header A cubicle heat dissipation structure, wherein an exhaust port is provided in the wall surface in the vicinity of the upper header. An electrical device that houses a main body device and a cooling medium in a container and includes a radiator that circulates and cools the cooling medium outside the container is housed inside a casing that forms a cubicle, and the heat dissipation In the heat dissipation structure of the cubicle configured to dissipate heat generated from the electrical device to the outside of the housing, the device is disposed so as to face the wall surface of the housing,
The radiator is provided in communication with the upper part of the side surface of the container and protrudes in the horizontal direction. The lower header is provided in communication with the lower part of the side surface of the container and protrudes in the horizontal direction. A plurality of heat dissipating fins communicating with each other in the vertical direction to form a flow path of the cooling medium, and comprising two types of heat dissipators having different lengths of the heat dissipating fins,
A plurality of the two types of radiators are alternately arranged on the side surface of the container so that the height of the upper header is aligned, and an air inlet is provided on the wall surface of the casing in the vicinity facing the lower header. A heat dissipation structure for a cubicle, characterized in that an exhaust port is provided in the wall surface in the vicinity facing the upper header.   The cubicle heat dissipation structure according to claim 1 or 2, wherein the electrical device is a stationary induction device.   The cubicle heat dissipation structure according to any one of claims 1 to 3, wherein the cooling medium is an insulating oil.   The cubicle heat dissipation structure according to any one of claims 1 to 4, wherein a space for accommodating the radiator and a space for accommodating the container of the electric device are partitioned by a partition in the housing. A cubicle heat dissipation structure characterized by   The cubicle heat dissipation structure according to any one of claims 1 to 5, wherein a fan is provided at the exhaust port so as to forcibly exhaust the outside air sucked from the intake port. Cubicle heat dissipation structure.

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