JP6894200B2 - Heat sink for electrical equipment - Google Patents

Description

Embodiments of the present invention relate to radiators for electrical equipment.

In recent years, as a cooling method adopted for electrical equipment such as a transformer, for safety reasons such as fire prevention, instead of the conventional method using insulating oil, for example, SF6, CO2 gas, dry air, etc. The number of methods using refrigerant gas is increasing. However, the above-mentioned refrigerant gas has a poor heat transfer coefficient and is inferior in cooling capacity as compared with the conventional insulating oil. Therefore, in the past, a radiator using a refrigerant gas would be larger than a radiator using insulating oil when trying to obtain a cooling capacity equivalent to that of a radiator using insulating oil, and the installation space would be increased. Was squeezing.

Japanese Unexamined Patent Publication No. 3-68114

Therefore, an embodiment of the present invention provides a radiator for an electric device that can be miniaturized without deteriorating the heat dissipation performance.

The radiator for electric equipment of the present embodiment has a plurality of heat sinks having a plurality of flow paths for flowing a refrigerant fluid inside, and a plurality of heat sinks formed in a plate shape having the same shape and laminated at a predetermined distance in the thickness direction. Each of the flow paths formed on the heat radiating plate is arranged at a predetermined interval in a direction perpendicular to the direction in which the flow path extends and in a direction along the surface of the heat radiating plate. The heat sinks are provided on both left and right ends and have different width dimensions on the left and right, and the heat sinks are provided on both ends of the flow path so as to penetrate the heat sink in the thickness direction and project in the stacking direction. has two header portions communicating, to, two of said header portion, such that the center of each header portion is positioned on a center line passing through a right angle direction of the center with respect to the longitudinal direction of the flow path in the heat radiating plate Alternatively, when two heat sinks are provided at positions symmetrical with each other with respect to the center point of the heat sinks and are adjacent to each other in the stacking direction, the heat sinks are alternately arranged in the stacking direction. It is arranged so that it is turned upside down or rotated 180 ° along the surface in the stacking direction with the center point as the fulcrum, and the left and right sides are aligned with respect to the stacking direction, and is formed on one of the heat sinks. The flow path and the flow path formed on the other heat sink are arranged in a staggered manner in a cross-sectional view cut along a plane perpendicular to the direction in which the flow path extends. The header portion provided on the heat sink and the header portion provided on the other heat sink are abutted and connected to each other, and the predetermined distance between adjacent heat sinks is formed on the heat sink. It is set to half of the predetermined interval between the flow paths.

A side view showing an example of a radiator for an electric device according to an embodiment. Front view showing an example of a radiator for an electric device according to an embodiment. The radiator for electrical equipment according to one embodiment is shown along the X3-X3 line of FIG. 2, and is a cross-sectional view showing an enlarged cross section of two heat sinks adjacent to each other in the stacking direction. A cross-sectional view corresponding to FIG. 3 of a radiator for electrical equipment having a conventional configuration.

Hereinafter, one embodiment will be described with reference to the drawings.
The radiator 10 for electrical equipment (hereinafter, simply referred to as a radiator 10) of the embodiment shown in FIG. 1 is a so-called panel radiator for electrical equipment, and includes a plurality of heat sinks 20, two connection portions 31, and the like. It has. The plurality of heat radiating plates 20 are laminated at predetermined intervals in the thickness direction of the heat radiating plates 20. As shown in FIGS. 1 and 2, each heat radiating plate 20 is formed in a rectangular plate shape as a whole. The heat radiating plate 20 has a plurality of flow paths 21 shown in FIGS. 2 and 3, and two header portions 22 shown in FIGS. 1 and 2. As shown in FIG. 2, each flow path 21 extends linearly along the surface of the heat sink 20. In the following description, the direction in which each flow path 21 extends is the vertical direction of the radiator 10. Further, the direction perpendicular to the direction in which each flow path 21 extends and along the surface of the heat radiating plate 20 is defined as the left-right direction of the radiating device 10.

Each flow path 21 is formed so that the cross section cut in the longitudinal direction of the flow path 21, that is, in the plane perpendicular to the vertical direction of the heat radiating plate 20, is circular as shown in FIG. The cross-sectional shape of the flow path 21 is not limited to a circle, and may be, for example, an ellipse, a rectangle, or a polygon. Each flow path 21 is arranged in one heat radiating plate 20 at a predetermined interval in a direction perpendicular to the extending direction of the flow path 21 and in a direction along the surface of the heat radiating plate 20, that is, in the left-right direction. ing. In this case, as shown in FIG. 3, the distance between the centers of two adjacent flow paths 21 in one heat sink 20 is defined as the center-to-center distance L.

The heat radiating plate 20 is formed by welding, for example, two pressed thin steel plates. In this case, half of the flow path 21 is formed on one thin steel plate by press working. Then, the heat radiating plate 20 is formed by superimposing and welding two thin steel plates on which half of the flow path 21 is formed. A refrigerant fluid such as SF6, CO2 gas, or dry air flows inside the flow path 21. The refrigerant fluid is not limited to gas, and may be a fluid such as insulating oil.

As shown in FIG. 3, when looking at two heat radiating plates 20 adjacent to each other in the stacking direction, the flow path 21 formed on one heat radiating plate 20 and the flow path 21 formed on the other heat radiating plate 20 are The flow paths 21 are arranged in a staggered manner so as to be staggered in a cross-sectional view cut along a plane perpendicular to the extending direction. That is, the flow paths 21 formed in the other heat sink 20 are arranged so as to be displaced by L / 2 in the left-right direction with respect to the flow paths 21 formed in the one heat sink 20.

In this case, looking at one heat sink 20, each flow path 21 is arranged so as to be asymmetric with respect to the center line Ch that divides the heat sink 20 into two in the left-right direction, as shown in FIG. .. That is, as shown in FIGS. 2 and 3, the heat radiating plate 20 has different width dimensions of the left and right edge portions 241 and 242 on the left and right ends. Specifically, of the left and right edge portions 241 and 242, the edge portion having the smaller width dimension is referred to as the first edge portion 241 and the edge portion having the larger width dimension is referred to as the second edge portion 242. Further, among the left and right end portions of the heat radiating plate 20, the end portion on the first edge portion 241 side is referred to as the first end portion 251 and the end portion on the second edge portion 242 side is referred to as the second end portion 252. Then, among each of the flow paths 21, the flow path on the first end 251 side is referred to as the first end side flow path 211, and the flow path on the second end 252 side is referred to as the second end side flow path 212.

Further, as shown in FIG. 3, the distance dimension from the center Px of the first end side flow path 211 to the first end portion 251 is defined as the distance X, and the second end side flow path 212 from the center Py to the second end. Let the distance dimension to the part 252 be the distance Y. In this case, the difference between the distance Y and the distance X is set to half of the distance L between the centers of the two adjacent flow paths 21 in the same heat sink 20, that is, L / 2.

The two header portions 22 are formed in a tubular shape as shown in FIGS. 1 and 2, and are provided so as to penetrate the heat radiating plate 20 in the thickness direction and communicate with each flow path 21. Further, as shown in FIG. 1, the header portion 22 is provided so as to project in a direction perpendicular to the surface of the heat radiating plate 20, that is, to project toward both sides in the stacking direction. That is, the header portion 22 is formed so as to penetrate the heat radiating plate 20 in the thickness direction. Each heat radiating plate 20 is welded in a state where the header portions 22 of the heat radiating plates 20 adjacent to each other in the stacking direction are butted against each other. As a result, the heat sinks 20 are connected to each other, and the flow paths 21 of the heat sinks 20 are communicated with each other via the header portion 22.

As shown in FIGS. 1 and 2, the two connecting portions 31 are provided on the heat radiating plate 20 on one end side in the stacking direction among the plurality of laminated heat radiating plates 20. The connecting portion 31 is formed in a tubular flange shape and is welded to the header portion 22. The connecting portion 31 is connected to a pipe member (not shown) through which the refrigerant fluid flows. Further, the heat radiating plate 20 forming the surface of the radiator 10 opposite to the connecting portion 31 is closed with a part of the header portion 22, that is, a portion forming the outermost surface. As a result, the end portion of the linear path formed by connecting the plurality of header portions 22 in the stacking direction of the heat radiating plates 20 is formed.

In this configuration, of the two connecting portions 31, for example, the refrigerant fluid that has flowed into the radiator 10 from the upper connecting portion 31 is distributed to each heat sink 20 through the upper header portion 22 in this case. At the same time, it flows from the top to the bottom in the flow path 21 of each heat sink 20. At that time, the refrigerant fluid is dissipated by heat exchange between the refrigerant fluid flowing through the flow path 21 and the outside air. Then, the refrigerant fluid flowing through the flow path 21 of the heat radiating plate 20 merges through the lower header portion 22 in this case, and then flows out from the lower connecting portion 31 in this case to the outside, that is, to the electric device side. ..

In this case, as shown in FIG. 1, the two header portions 22 are arranged so that the center of each header portion 22 is located on the center line Ch in the left-right direction of the heat radiating plate 20, or at the center point O of the heat radiating plate 20. On the other hand, it is provided so as to be point-symmetrical. In the case of the present embodiment, the two header portions 22 are symmetrical with respect to the center line Cv that divides the heat sink 20 into two in the vertical direction, and the center position of the header portion 22 is located on the center line Ch in the horizontal direction. It is arranged to do.

In this case, the heat sinks 20 are each formed to have the same shape, but the postures in which they are arranged, that is, the directions of the heat sinks 20, are different so as to alternate toward the stacking direction. That is, each heat sink 20 is arranged in a posture of being alternately turned upside down or rotated 180 ° along the surface of the heat sink 20 with the center point O as a fulcrum in the stacking direction. As a result, as shown in FIG. 3, the flow paths 21 of the heat sinks 20 are arranged in a staggered manner.

Next, the relationship between the separation distance D and the stacking distances Ha and Hb in the present embodiment shown in FIG. 3 and the conventional configuration shown in FIG. 4 will be described. The radiator of the conventional configuration shown in FIG. 4 is composed of a heat sink 90. The heat sink 90 having the conventional configuration is symmetrically configured in the left-right direction. In this case, the heat sink 90 having the conventional configuration has a flow path 21 like the heat sink 20 of the present embodiment.

The stacking distances Ha and Hb mean the distance between the two heat sinks 20 or the heat sinks 90 adjacent to each other in the stacking direction, that is, the distance between the centers of the thicknesses of the two heat sinks 20 and 90. Further, as shown in FIGS. 3 and 4, the separation distance D is the distance between the centers of the two flow paths 21 that are closest to each other between the two heat sinks 20 adjacent to each other in the stacking direction or between the heat sinks 90. Means. This separation distance D is a distance required to smoothly flow the outside air or the like necessary for heat exchange with the refrigerant fluid flowing in the flow path 21 between the adjacent heat sinks 20 or 90. Is. The separation distance D is appropriately set according to the diameter of the flow path 21, the type of refrigerant fluid, and the like. In this case, the separation distance D in the embodiment of the present application shown in FIG. 3 and the separation distance D in the conventional configuration shown in FIG. 4 are set to the same value.

First, let us look at the stacking distance Hb in the conventional configuration shown in FIG. The heat sinks 90 shown in FIG. 4 are simply laminated and arranged so that the flow paths 21 do not have a staggered shape. In this configuration, the two flow paths 21 that are closest to each other between the two heat sinks 90 adjacent to each other in the stacking direction are arranged on a straight line in the stacking direction. Therefore, in the configuration of FIG. 4, the stacking distance Hb is the separation distance D.

On the other hand, in the present embodiment shown in FIG. 3, the flow paths 21 are arranged in a staggered manner so as to be staggered with each other. In this configuration, the two flow paths 21 that are closest to each other between the heat sinks 20 are arranged so as to be inclined with respect to the stacking direction. That is, the two flow paths 21 that are closest to each other between the two adjacent heat sinks 20 do not line up in a straight line in the stacking direction. In this case, the distance between the centers of the two closest flow paths 21 is the separation distance D. Then, assuming that the angle formed by the straight line connecting the centers of the two closest flow paths 21 and the surface of one of the heat sinks 20 is the angle α, the stacking distance Ha is expressed by the following equation (1). ..
Ha = Hb × sinα = D × sinα ・ ・ ・ (1)

In this case, 0 <α <90 °. Therefore, according to the formula (1), the stacking distance Ha in the present embodiment shown in FIG. 3 does not exceed the stacking distance Hb of the conventional configuration shown in FIG. 4, that is, the separation distance D. In this case, for example, if the separation distance D and the center-to-center distance L are equal, α = 60 ° and Ha = D × (√3 / 2). That is, in this case, if the separation distance D and the center-to-center distance L are equal, the stacking distance Ha in the present embodiment shown in FIG. 3 is (√3 / 2) times the stacking distance Hb of the conventional configuration shown in FIG. Become. Further, for example, when α = 45 °, the stacking distance Ha of the present embodiment shown in FIG. 3 is (1 / √2) times the stacking distance Hb of the conventional configuration shown in FIG. In this way, by arranging the flow paths 21 in a staggered pattern, the same separation distance D as in the conventional configuration is secured, and the stacking distance Ha between the heat radiation plates 20 is not arranged in a staggered pattern in the conventional configuration. It can be shortened from the stacking distance Hb of.

According to the embodiment described above, the radiator 10 includes a plurality of heat sinks 20. The heat radiating plate 20 has a plurality of flow paths 21 for flowing the refrigerant fluid inside, is formed in a plate shape, and is laminated with a predetermined distance Ha in the thickness direction of the plate shape. Each heat sink 20 has a plurality of flow paths 21. The flow paths 21 are arranged at right angles to the direction in which the flow path 21 extends and at predetermined intervals in the direction along the surface of the heat radiating plate 20. When looking at the two heat radiating plates 20 adjacent to each other in the stacking direction, the flow path 21 formed on one heat radiating plate 20 and the flow path 21 formed on the other heat radiating plate 20, respectively, are the flow paths 21. They are arranged in a staggered pattern in a cross-sectional view cut along a plane perpendicular to the extending direction.

That is, the flow paths 21 in the two heat sinks 20 adjacent to each other in the stacking direction are arranged in a staggered pattern. According to this, while ensuring the separation distance D between the flow paths 21 closest to each other between the two adjacent heat sinks 20 to a predetermined value or more, the stacking distance Ha between the heat sinks 20 is set to the stacking distance Hb of the conventional configuration. Can be shrunk than. In other words, the stacking distance Ha between the heat radiating plates 20 can be shortened as compared with the stacking distance Hb of the conventional configuration without reducing the separation distance D. As a result, in the radiator 10, the thickness of the heat sink 20 in the stacking direction can be reduced while maintaining the same heat dissipation performance as that of the radiator having the conventional configuration, and the overall size can be reduced.

Each heat sink 20 has two header portions 22 respectively. The two header portions 22 are provided at both ends in the longitudinal direction of the flow path 21, that is, at both ends in the vertical direction. Each header portion 22 penetrates the heat radiating plate 20 in the thickness direction and communicates with the flow path 21. The two header portions 22 are provided so that the center of the header portion 22 is located on the center line Ch in the left-right direction of the heat radiating plate 20 or is point-symmetrical with respect to the center point O of the heat radiating plate 20. Has been done.

According to this, each heat radiating plate 20 having the same shape is arranged in a form of being alternately turned upside down or rotated 180 ° along the surface of the heat radiating plate 20 with the center point O as a fulcrum in the stacking direction. As shown in FIG. 3, the flow paths 21 of each heat radiation plate 20 can be arranged in a staggered manner. That is, according to this, in order to arrange the flow paths 21 in a staggered manner, it is not necessary to make the shapes of the heat sinks 20 arranged in the stacking direction different. That is, even when the flow paths 21 are arranged in a staggered pattern, the shape of each heat sink 20 can be made common. As a result, for example, the press mold required for manufacturing the heat sink 20 can be standardized, and as a result, it is possible to suppress an increase in the types of parts and an increase in manufacturing cost due to the staggered arrangement of the flow paths 21. it can.

Further, in the same heat radiating plate 20, for example, the distance Y dimension from the center portion Py of the second end portion side flow path 212 provided on the second end portion 252 side to the second end portion 252 and the first end portion 251 The difference from the distance X dimension from the center Px of the first end side flow path 211 provided on the side to the first end 251 is the distance L between the centers of two adjacent flow paths 21 in the same heat radiation plate 20. It is set to L / 2, which is half of. According to this, as shown in FIG. 3, each heat radiating plate 20 is arranged in a posture of being alternately turned upside down or rotated 180 ° along the surface of the heat radiating plate 20 with the center point O as a fulcrum in the stacking direction. When this is done, the ends 251 and 252 are aligned on a straight line extending in the stacking direction. Therefore, even when the flow paths 21 are arranged in a staggered pattern, the first end portion 251 and the second end portion 252 are alternately stepped when the entire radiator 10 is viewed. Can be prevented. As a result, it is possible to improve the design of the appearance when the entire radiator 10 is viewed.

Although one embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This novel embodiment can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

In the drawing, 10 is a radiator for electrical equipment, 20 is a heat sink, 21 is a flow path, 22 is a header, 251 is a first end (one end), and 252 is a second end (the other end). Is shown.

Claims (2)

It has a plurality of flow paths for flowing a refrigerant fluid inside, and is provided with a plurality of heat sinks formed in a plate shape of the same shape and laminated at a predetermined distance in the thickness direction.
Each of the flow paths formed on the heat radiating plate is arranged at a predetermined interval in a direction perpendicular to the direction in which the flow path extends and in a direction along the surface of the heat radiating plate.
The heat radiating plates are provided on both left and right ends and have different width dimensions on the left and right, and the heat radiating plates are provided on both ends of the flow path so as to penetrate the heat radiating plate in the thickness direction and project in the stacking direction. It has two header in communication with the road, and
The two header portions are pointed so that the center of each header portion is located on the center line passing through the center in the direction perpendicular to the longitudinal direction of the flow path in the heat radiation plate or with respect to the center point of the heat radiation plate. Provided at symmetrical positions
When looking at the two heat radiating plates adjacent to each other in the stacking direction, the heat radiating plates are alternately inverted toward the stacking direction or rotated 180 ° along the surface in the stacking direction with the center point as a fulcrum. And, the left and right sides are arranged so as to be aligned with each other in the stacking direction, and the flow path formed on one of the heat radiating plates and the flow path formed on the other heat radiating plate are respectively. It is arranged in a staggered pattern in a cross-sectional view cut along a plane perpendicular to the direction in which the flow path extends.
The header portion provided on one of the heat sinks and the header portion provided on the other heat sink are abutted and connected to each other.
The predetermined distance between the adjacent heat sinks is set to half of the predetermined distance between the flow paths formed in the heat sinks.
Heat sink for electrical equipment. In the same heat radiating plate, from the distance dimension from the center of the flow path provided on one end side to one end of the heat radiating plate and the center of the flow path provided on the other end side. The difference from the distance dimension to the other end of the heat radiating plate is set to half the distance between the centers of the two adjacent flow paths in the same heat radiating plate.
The radiator for electrical equipment according to claim 1.

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