JP5653950B2 - Cooling system - Google Patents

Description

  The present invention relates to a cooling device that cools a heating element by forced air cooling, and more specifically, cools an electrical component such as a power conversion device mounted on a moving body such as a railway vehicle, an aircraft, or a ship by forced air cooling. The present invention relates to a cooling device.

  As a conventional cooling device, there is a cooling device 41 for electric parts shown in FIGS. This conventional example 1 includes a plate-shaped heat receiving block 42, a plurality of U-shaped heat pipes 43 standing on the surface of the heat receiving block 42, and a direction parallel to the surface of the heat receiving block 42 to the heat pipe 43. And a plurality of (11 in FIG. 14) radiation fin groups 48 each having a plurality of radiation fins 47 attached thereto. The radiating fin pitch between the radiating fins 47 is formed so as to be uniform in any part (Patent Document 1). In Conventional Example 1, in order to suppress the loss of the pressure of the cooling air by the U-shaped heat pipe 43 in the side view, the side surface of the U-shaped heat pipe 43 in the side view is in the flow direction of the cooling air. The heat pipe 43 is arranged so as to be in the parallel direction.

  However, in the conventional cooling device, when a plurality of heat generating elements having different heat generation amounts are mounted, there is a problem that the temperature of the heat generating element having a large heat generation amount becomes high. For example, as shown in FIG. 16, the heat receiving block 42 of the conventional example 1 has a 1000 W heating element 400-1, a 200 W heating element 400-2, a 2000 W heating element in a direction orthogonal to the cooling air flow direction. When the heating element group in which 400-3 is arranged one by one is mounted in four rows in the direction parallel to the cooling air flow direction, the heating element mounted on the most windward side and mounted on the most leeward side The temperature difference with respect to the generated heating element remains at 4 ° C. On the other hand, a temperature difference of 25 ° C. occurs between the 2000 W heating element 400-3 and the 200 W heating element 400-2 mounted next to the 2000 W heating element 400-3. Therefore, the conventional example 1 has a problem that the temperature difference between the heat generating elements arranged in the direction orthogonal to the flow direction of the cooling air becomes large. In particular, the 2000 W heat generating element 400- having a large heat generation amount. There is a problem that the temperature of 3 becomes high.

  Therefore, in order to suppress the temperature difference between the heating elements arranged in the direction orthogonal to the flow direction of the cooling air, as shown in FIGS. There is also a cooling device 41 ′ (hereinafter sometimes referred to as Conventional Example 2) in which a heat pipe 43 ′ is arranged in the heat receiving block 42 ′ and a heat radiating fin 47 is attached so as to be orthogonal to the flow direction of the cooling air. Conceivable.

  As shown in FIG. 19, in this embodiment, the temperature difference between the 2000 W heating element 400-3 and the 200 W heating element 400-2 mounted next to the 2000 W heating element 400-3 is 15 ° C. Slightly reduced. In Conventional Example 2, the number of heat pipes 43 ′, which is the resistance of the cooling air, is smaller than that in Conventional Example 1 so that the pressure loss of the cooling air is reduced. However, the heat pipe 43 ′ Since there is no transportation, the temperature difference between the heating element mounted on the most leeward side and the heating element mounted on the most leeward side spreads to 10.5 ° C.

  Therefore, when a plurality of heat generating elements having different heat generation amounts are mounted on the conventional cooling device, the temperature between the heat generating elements becomes non-uniform, and a heat generating element that is difficult to cool and suppresses a decrease in temperature is generated. There is a problem.

  In order to increase the cooling capacity of the cooling device 41 for the part of the heat receiving block 42 corresponding to the position of the heat generating element that is difficult to be cooled, it is necessary to increase the number of installed radiation fins 47 for that part. However, when the number of the radiating fins 47 in the part is increased, the size of the cooling device 41 is increased and the weight is increased. Furthermore, the design freedom is lost and the manufacturing cost is increased. is there.

JP-A-9-119785

  The present invention has been made in view of the above-described problems of the prior art, and even when a plurality of heat generating elements having different heat generation amounts are mounted, the temperature between the heat generating elements is made uniform, and the heat generating elements that are difficult to be cooled are generated. It is an object of the present invention to provide a cooling device that can be prevented.

Aspects of the present invention include a heat receiving block that can be thermally connected to a plurality of heat generating elements having different heat generation amounts, a plurality of U-shaped heat pipes that are thermally connected to the heat receiving block, and the plurality of side surfaces. A cooling device comprising a radiating fin thermally connected to a U-shaped heat pipe , wherein a flow of cooling air is set in a direction parallel to the surface of the heat receiving block. mounting et a in the surface, the bottom of the plurality of side view the U-shaped heat pipe, that said linear heat pipe and thermally in being mounted et the contact a linear heat pipe to the surface connected, the linear heat pipe in the longitudinal direction the side view the U-shaped through a straight linear heat pipe provided in a direction perpendicular to the side surface of the heat pipe of the plurality of side view the U-shaped heat pipe Are in thermal contact with each other Are, a back surface of the heat receiving block, wherein the side view the U-shaped heat pipe and the linear heat pipe is not attached is a surface for mounting the heat generating element, wherein the linear heat pipe, From the side-view U-shaped heat pipe that is thermally connected at the portion of the heat receiving block corresponding to the position of the heat generating element having a relatively large amount of heat generation, the heat generating element having a relatively small heat generation amount The heat receiving block is arranged so that the heat transferred from the heat receiving block is transported to the U-shaped heat pipe that is thermally connected to the heat receiving block corresponding to the position. It is a cooling device.

  “Thermal conductive member” is a member having excellent thermal conductivity, such as a heat pipe or a metal (for example, aluminum or copper) having a thermal conductivity at 25 ° C. of 100 W / (m · K) or more. It is done. In this aspect, since the plurality of first heat conducting members are thermally connected to one second heat conducting member, heat transport from one first heat conducting member to another first heat conducting member is This is done through one second heat conducting member.

  An aspect of the present invention is the cooling device, wherein the plurality of first heat conducting members are a plurality of heat pipes arranged on a surface of the heat receiving block.

  An aspect of the present invention is a plurality of U-shaped heat pipes in a side view, in which the plurality of first heat conducting members are arranged on the surface of the heat receiving block, and a width direction of the U-shaped portion in the side view The cooling apparatus is characterized in that the size of the heat pipes arranged on the leeward side of the cooling air is larger than the heat pipes erected on the leeward side of the cooling air. In this aspect, an array of heat pipes that are U-shaped in a side view is formed on the surface of the heat receiving block. The arrangement of the heat pipes is such that the dimensions of the heat pipes erected on the leeward side of the cooling air are set on the leeward side of the cooling air. It has the arrangement | positioning site | part which is larger than this dimension of the installed heat pipe.

  An aspect of the present invention is the cooling device, wherein the second heat conducting member is a linear heat pipe.

  In an aspect of the present invention, the linear heat pipe is provided in a direction in which a longitudinal direction of the linear heat pipe and a side surface of the U-shaped heat pipe in a side view are orthogonal to each other. It is.

  In the aspect of the present invention, a plurality of radiating fin groups each provided with a plurality of radiating fins are arranged in tandem along the flow direction of the cooling air, and are arranged on the upstream side of the cooling air among the plurality of radiating fin groups. The cooling device is characterized in that a heat dissipation fin pitch of the heat dissipation fin group is larger than a heat dissipation fin pitch of the heat dissipation fin group disposed on the leeward side of the cooling air.

  In this aspect, the plurality of radiating fin groups are arranged in parallel or substantially parallel to the flow direction of the cooling air. Moreover, the surface of each radiation fin which comprises the said radiation fin group is also attached in parallel or substantially parallel with respect to the flow direction of cooling air. Thereby, the cooling air flows smoothly between the radiating fins. The radiating fin pitch of each radiating fin constituting the same radiating fin group is the same or substantially the same, but the radiating fin pitch is different for each radiating fin group, that is, if the radiating fin group is different, between adjacent radiating fins The heat dissipating fin pitch is also different. And the radiation fin pitch of the radiation fin group arrange | positioned in the windward side of cooling air is larger than the radiation fin pitch of the radiation fin group arrange | positioned in the leeward side of cooling air. The "radiation fin group" is a radiation fin in which a plurality of radiation fins whose surfaces are attached in parallel or substantially parallel to the cooling air flow direction are arranged in a direction perpendicular to the cooling air flow direction. Means a group of

  An aspect of the present invention is the cooling device characterized in that the radiating fin pitch of the radiating fin group arranged on the leeward side is an integral multiple of the radiating fin pitch of the radiating fin group arranged on the leeward side. . By setting the radiating fin pitch of adjacent radiating fin groups to an integral multiple, the phase of the radiating fin pitch between the radiating fin groups is aligned.

  According to the aspect of the present invention, heat transfer from one first heat conducting member to another first heat conducting member is performed through the second heat conducting member, so that the heat generating element is thermally transferred from the heating element to the predetermined portion of the heat receiving block. Heat transferred to the connected first heat conducting member can be transported to another first heat conducting member thermally connected to another part of the heat receiving block. Accordingly, even when a plurality of heating elements having different heating amounts are mounted on one heat receiving block, the temperature difference between the heating elements is reduced, and a predetermined heating element, that is, a heating element having a large heating amount, is a heating element having a small heating amount. It can prevent that it becomes difficult to be cooled. In this way, the cooling temperature between the heat generating elements can be made uniform, so that even a large cooling device with a long radiating fin length can reliably exhibit cooling capacity from the leeward side to the leeward side. it can.

  Since it is not necessary to increase the number of installed heat radiating fins for the part of the heat receiving block corresponding to the position of the heat generating element that is difficult to cool, the cooling device can be reduced in size and weight, and the manufacturing cost is also increased. Can be suppressed. Furthermore, since it is not necessary to adjust the number of radiating fins corresponding to the position of the heat generating element that is difficult to be cooled, the degree of freedom in design is improved.

  According to the aspect of the present invention, the cooling efficiency is further improved by using the heat pipe as the first heat conducting member and the second heat conducting member.

  According to the aspect of the present invention, the widthwise dimension of the U-shaped heat pipe in the side view is larger in the width direction of the U-shaped heat pipe than the heat pipe on the leeward side of the cooling wind. Therefore, the heat pipe arranged on the leeward side can suppress the pressure of the cooling air and the reduction of the wind force on the leeward side, so that the temperature between the heating elements on the leeward side and the leeward side is more uniform. Can be

  According to the aspect of the present invention, the radiating fin pitch of the radiating fin group arranged on the leeward side of the cooling air is larger than the radiating fin pitch of the radiating fin group arranged on the leeward side of the cooling air. It is possible to suppress the cooling wind pressure and wind power from being reduced on the leeward side by the fin group. In this way, since the pressure of the cooling wind and the reduction of the wind force by the windward radiating fin group can be suppressed, the cooling capacity on the leeward side is further improved, and the temperature difference between the heating elements on the windward side and the leeward side can be further reduced. . Further, the temperature difference between the heating elements on the leeward side and the leeward side can be further reduced from the point that the radiating area of the leeward side radiating fin group is larger than that of the leeward side radiating fin group.

  Since the radiating fin pitch of the leeward radiating fin group is an integral multiple of the radiating fin pitch of the leeward radiating fin group, the pressure of the cooling wind by the leeward radiating fin group and the reduction of the wind force can be suppressed. Cooling air can efficiently flow through the radiating fin group on the leeward side, and the temperature difference between the heating elements on the leeward side and the leeward side can be further reduced.

It is a cooling device concerning the example of a 1st embodiment of the present invention, and is a side view in the state where a heating element was attached. It is a cooling device concerning the example of a 1st embodiment of the present invention, and is a top view in the state where a heating element was attached. It is explanatory drawing which expanded the one part about the heat pipe of the cooling device which concerns on the example of 1st Embodiment of this invention. It is a cooling device concerning the example of a 1st embodiment of the present invention, and is an explanatory view in the state where a heating element was attached. It is a cooling device which concerns on the 2nd Example of this invention, Comprising: It is a side view of the state which attached the heat generating element. It is a cooling device concerning the example of a 2nd embodiment of the present invention, and is a top view in the state where a heating element was attached. It is a cooling device which concerns on the 2nd Example of this invention, Comprising: It is explanatory drawing of the state which attached the heat generating element. It is a cooling device which concerns on the 3rd Embodiment of this invention, Comprising: It is a side view of the state which attached the heat generating element. It is a cooling device concerning the example of a 3rd embodiment of the present invention, and is a top view in the state where a heating element was attached. It is a cooling device concerning the example of a 4th embodiment of the present invention, and is a side view in the state where a heating element was attached. It is a cooling device concerning the example of a 4th embodiment of the present invention, and is a top view in the state where a heating element was attached. It is a cooling device concerning the example of a 4th embodiment of the present invention, and is an explanatory view in the state where a heating element was attached. (A) The figure is the perspective view which expanded a part of heat receiving block of the cooling device which concerns on 1st Embodiment, (b) The figure attaches a 1st heat pipe to the heat receiving block of the cooling device which concerns on 1st Embodiment. Explanatory drawing which expanded a part of the aspect which expanded, (c) The figure which expanded the partial part of the aspect which attached the 2nd heat pipe to the heat receiving block of the cooling device which concerns on the example of 1st Embodiment, (d) figure These are the perspective views of the aspect which attached the 1st heat pipe and the 2nd heat pipe to the heat receiving block of the cooling device which concerns on the example of 1st Embodiment, (e) Figure is a perspective view of the aspect which attached the radiation fin. It is a conventional cooling device, Comprising: It is a side view of the state which attached the heat generating element. It is a conventional cooling device, Comprising: It is a top view of the state which attached the heat generating element. It is a conventional cooling device, and it is explanatory drawing of the state which attached the heat generating element. FIG. 6 is a side view of another conventional cooling device with a heating element attached. It is another conventional cooling device, and is a top view in the state where a heating element was attached. It is explanatory drawing of the state which was another conventional cooling device, Comprising: The heat generating element was attached.

The cooling device according to the first embodiment of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, the cooling device 1 according to the first embodiment of the present invention is a heat pipe type cooling device, and has a flat plate-like heat receiving block 2 and a vertical surface on the surface of the heat receiving block 2. A plurality of attached first heat pipes 3 having a U-shape in side view, a plurality of radiating fins 7 attached to the first heat pipes 3, and a first heat pipe 3 thermally connected to the plurality of first heat pipes 3. 2 heat pipes 5. In the cooling device 1 according to the first embodiment, the first heat pipe 3 has the same size and shape. Further, the first heat pipe 3 has a plurality (6 or 7 in FIG. 2) on a straight line such that the side surface portion that is U-shaped in a side view is parallel to the flow direction of the cooling air. Arranged to form one first heat pipe group 4. Further, the first heat pipe group 4 is provided in a plurality of rows (19 rows in FIG. 2) in a direction orthogonal to the flow direction of the cooling air. Further, the first heat pipe group 4 is in a state of being alternately shifted by a specific interval in a direction parallel to the flow direction of the cooling air. In addition, about the 1st heat pipe 3, it is not limited to the aspect which has all the same dimension and shape as mentioned above, The predetermined 1st heat pipe 3 is needed as needed, such as avoiding an obstruction. These dimensions and shapes may be changed as appropriate.

  As shown in FIG. 2, the second heat pipe 5 has a linear shape. The second heat pipe 5 is attached such that its longitudinal direction is orthogonal to the flow direction of the cooling air. A plurality (14 in FIG. 2) of second heat pipes 5 are arranged on the surface portion of the heat receiving block 2 to form one second heat pipe group 6. The second heat pipe 5 is thermally connected to any one first heat pipe 3 among the six or seven first heat pipes 3 constituting the first heat pipe group 4. In addition, as described above, the first heat pipe group 4 is in a state of being alternately shifted by a specific interval in a direction parallel to the flow direction of the cooling air, and each of the second heat pipes 5 is in the flow direction of the cooling air. Every second heat pipe group 4 provided in 19 rows in the orthogonal direction. Therefore, the second heat pipe 5 is thermally connected to all the first heat pipes 3 arranged in a straight line in a direction orthogonal to the flow direction of the cooling air.

  The site | part of the 1st heat pipe 3 to which the 2nd heat pipe 5 is thermally connected is not specifically limited, such as a bottom part, a side part, a top part, etc. of side view U shape. In the first embodiment, in order to facilitate the heat transport between the first heat pipes 3, the second heat pipe 5 is the middle part of the U-shaped bottom (see FIG. 1) for each first heat pipe 3. 2 is arranged so as to be located in the center of the bottom or in the vicinity of the center). That is, it arrange | positions so that the longitudinal direction of the 2nd heat pipe 5 may orthogonally cross with respect to the longitudinal direction of the U-shaped bottom part of the 1st heat pipe 3. FIG. Accordingly, the second heat pipes 5 forming the second heat pipe group 6 are arranged at a predetermined interval (in FIG. 1 and FIG. 2, an interval approximately half the width of the U-shaped portion of the first heat pipe 3). Yes. However, in order to improve the cooling capacity on the leeward side, the first heat pipe 5 provided on the most leeward side is provided with two second heat pipes 5.

  The thermal connection means between the first heat pipe 3 and the second heat pipe 5 is not particularly limited. However, as shown in FIG. 3, in the first embodiment, the second heat pipe 5 is in contact with the first heat pipe 3. It is thermally connected by being in contact. In FIG. 3, the surface of the second heat pipe 5 opposite to the heat radiating fin 7 is the U-shaped bottom of the first heat pipe 3, and the surface of the bottom heat radiating fin 7 is contacted. The first heat pipe 3 and the second heat pipe 5 are thermally connected by being in contact with each other.

  A plurality of (11 in FIG. 1) radiating fins 7 are arranged at equal intervals in the vertical direction with respect to the surface of the heat receiving block 2, respectively, and each radiating fin 7 has a surface with respect to the surface of the heat receiving block 2. Arranged so as to be parallel to each other, one radiating fin group 8 is formed. Accordingly, a gap having a certain width extends in parallel with the surface of the heat receiving block 2 between the heat radiating fins 7. Each of the radiating fins 7 has the same shape and dimensions, and the edge portions of the radiating fins 7 are in a state where 11 sheets are aligned.

  The heat radiation fin 7 and the heat receiving block 2 are both flat plates made of a metal material having good thermal conductivity, and are made of aluminum, aluminum alloy, copper, copper alloy, or the like. The container material of the first heat pipe 3 and the container material of the second heat pipe 5 are also made of the same metal material as the heat radiation fins 7 and the heat receiving block 2. In the hydraulic fluid of the first heat pipe 3 and the second heat pipe 5, the hydraulic fluid that matches the compatibility with the container material is sealed in a reduced pressure state. For example, when the container is copper, the working fluid uses pure water.

  A heat connection is possible by mounting a heating element 100 as a cooled object on the back surface of the heat receiving block 2 corresponding to the side where the first heat pipe 3 and the second heat pipe 5 are not attached.

  In the cooling device 1 according to the first embodiment, the heat receiving block 2 has a width of 500 mm, a length of 1000 mm, and a thickness of 25 mm, and the first heat pipe 3 that is U-shaped in side view has a pipe diameter of It is 12.7 mm, the height is 170 mm, and the dimension in the width direction of the U-shaped portion in side view is 100 mm. The dimensions of the second heat pipe, which is linear, are a pipe diameter of 6 mm and a length of 400 mm. The cross-sectional shapes of the first heat pipe 3 and the second heat pipe 5 are both circular. The dimensions of the radiating fin 7 are 450 mm wide, 900 mm long and 0.5 mm thick, and the gap between the radiating fins 7 is 6 mm.

  In the cooling device 1 according to the first embodiment, cooling air is supplied in the direction of the arrows in FIGS. Furthermore, the direction of the cooling air coincides with the direction parallel or substantially parallel to the surface of the heat receiving block 2, that is, the cooling air flows in a direction parallel or substantially parallel to the surface of the heat radiation fin 7. The cooling device 1 is installed. As a result, the cooling air can smoothly pass through the gaps between the radiating fins 7.

  Next, a case where a plurality of heat generating elements having different heat generation amounts are mounted on the cooling device 1 according to the first embodiment will be described. Here, as in the case of Conventional Example 1, as shown in FIGS. 2 and 4, the heat receiving block 2 of the cooling device 1 has a 1000 W heating element 100-1 in a direction orthogonal to the flow direction of the cooling air, A description will be given by taking as an example a case where four heating element groups in which one 200 W heating element 100-2 and one 2000 W heating element 100-3 are arranged in parallel to the flow direction of the cooling air are mounted. To do.

  In the cooling device 1 according to the first embodiment, the second heat pipe 5 arranged so that the longitudinal direction is orthogonal to the flow direction of the cooling air is 19 in the direction orthogonal to the flow direction of the cooling air. Every other first heat pipe group 4 arranged in a row, that is, each second heat pipe 5 is thermally connected to nine or ten first heat pipes 3. On the other hand, the heat released from each heating element 100 is transmitted to the heat receiving block 2 thermally connected to each heating element 100. The heat transmitted to the heat receiving block 2 is transmitted to the bottom portion of the first heat pipe 3 having a U-shape in side view, which is thermally connected to the heat receiving block 2, that is, the heating portion of the first heat pipe 3. Then, the heat transport system of the first heat pipe 3 is activated, and the heat absorbed by the heating part of the first heat pipe 3 is cooled via the cooling part of the first heat pipe 3 extending from the heating part. It is transmitted to the radiation fins 7 that are receiving the flow of wind and thermally connected to the first heat pipe 3, and discharged from the radiation fins 7 to the outside of the cooling device 1.

  At this time, among the plurality of heating elements 100, the heating amount of the 2000W heating element 100-3 is relatively larger than the heating amount of the 200W heating element 100-2 and the 1000W heating element 100-1, and is 2000W. The heating amount of the 200 W heating element 100-2 mounted next to the heating element 100-3 is relatively smaller than that of the 2000 W heating element 100-3 and the 1000 W heating element 100-1. Therefore, the amount of heat transmitted to the part corresponding to the position of the heat generating element 100 having a relatively large amount of heat generation in the heat receiving block 2 is transmitted to the part corresponding to the position of the heat generating element 100 having a relatively small amount of heat generation. More than the amount of heat. Among a plurality of first heat pipes 3 that are thermally connected to the same second heat pipe 5, thermal connection is made at a portion of the heat receiving block 2 corresponding to the position of the heat generating element 100 that generates a relatively large amount of heat. The first heat pipe 3 receives more heat than the first heat pipe 3 thermally connected at the portion of the heat receiving block 2 corresponding to the position of the heat generating element 100 that generates a relatively small amount of heat. Transmitted from block 2.

  Thereby, the heat transport system of the second heat pipe 5 is activated, and the first heat pipe 3 thermally connected at the portion of the heat receiving block 2 corresponding to the position of the heat generating element 100 having a relatively large calorific value. The heat transmitted from the heat receiving block 2 is transported from the heat receiving block 2 to the first heat pipe 3 that is thermally connected at the portion of the heat receiving block 2 corresponding to the position of the heat generating element 100 that generates a relatively small amount of heat. The heat transported to the first heat pipe 3 corresponding to the position of the heat generating element 100 having a relatively small heat generation amount is released to the outside of the cooling device 1 using the heat transport system of the first heat pipe 3. . As a result, the temperature difference between the heat generating elements 100 having different heat generation amounts is reduced, the temperature between the heat generating elements 100 is made uniform, and the generation of the heat generating elements 100 that are not easily cooled can be prevented. Therefore, the second heat pipe 5 is a heat equalizing heat pipe having an effect of leveling the cooling temperature between the heat generating elements 100 mounted on the cooling device 1, that is, a heat equalizing effect between the heat generating elements 100.

  As shown in FIG. 4, in the cooling device 1 according to the first embodiment, the heating elements 100-1, 100-2, 100 in the order of 1000 W, 200 W, 2000 W in the direction orthogonal to the flow direction of the cooling air. -3 are mounted in four rows in parallel to the cooling air flow direction, the heating element group mounted on the most windward side and mounted on the most leeward side. The temperature difference between the heat generating element 100 and the heat generating element 100 is maintained at 4 ° C., which is the same value as that of the conventional example 1, and 200 W mounted next to the 2000 W heat generating element 100-3 and the 2000 W heat generating element 100-3. The temperature difference with the heating element 100-2 was 10 ° C., which was greatly reduced compared to the conventional example 1 (temperature difference 25 ° C.).

  Next, a cooling device according to a second embodiment of the present invention will be described with reference to the drawings. In the cooling device 1 of the first embodiment, all the first heat pipes 3 have the same dimensions and shapes, and the first heat pipe groups 4 all have the same dimensions and shapes. It consisted of three. As shown in FIGS. 5 and 6, in the cooling device 21 according to the second embodiment of the present invention, instead of this, the first heat pipe 23 attached on the upstream side of the cooling air and the downstream side of the cooling air are provided. In the first heat pipe group 24 of the cooling device 21 according to the second embodiment, the dimension in the width direction of the U-shaped portion in side view The first heat pipe 23 provided on the leeward side of the cooling air has an arrangement part of the first heat pipe 23 that is smaller than the first heat pipe 23 provided on the leeward side of the cooling air. .

  The cooling device 21 according to the second embodiment of the present invention, like the cooling device 1, has a flat plate-shaped heat receiving block 22 and a plurality of U-shaped side views attached to the surface of the heat receiving block 22 in the vertical direction. The first heat pipe 23, a plurality of (11 in FIG. 5) radiation fins 27 attached to the first heat pipe 23, and a second heat pipe 25 thermally connected to the plurality of first heat pipes 23. And. A plurality of (six in FIG. 6) first heat pipes 23 are arranged on a straight line such that the side surface portion that is U-shaped in a side view is parallel to the flow direction of the cooling air. One first heat pipe group 24 is formed. Further, the first heat pipe group 24 is provided in a plurality of rows (19 rows in FIG. 6) in a direction orthogonal to the flow direction of the cooling air. The first heat pipe group 24 is in a state of being alternately shifted by a specific interval in a direction parallel to the flow direction of the cooling air.

  As shown in FIG. 6, in the cooling device 21, like the cooling device 1, the second heat pipe 25 has a linear shape. The second heat pipe 25 has a plurality of (15 in FIG. 6) longitudinal directions arranged on the surface portion of the heat receiving block 22 in a direction perpendicular to the flow direction of the cooling air, and one second heat pipe. A group 26 is formed.

  On the other hand, the cooling device 21 includes a first heat pipe group 24 in which a plurality (six in FIG. 5 and 6) of first heat pipes 23 are arranged in a straight line in a direction parallel to the flow direction of the cooling air. Of these, the first heat pipe 23-1 attached to the windward side of the cooling air (in FIGS. 5 and 6, two of the six on the windward side) is an intermediate portion between the windward side and the leeward side of the cooling air. The dimension in the width direction of the U-shaped portion in side view is more than the first heat pipe 23-2 attached to the first heat pipe 23-2 (in FIG. 5 and 6, two of the six are in the middle part between the windward side and the leeward side). It is getting bigger. Moreover, the 1st heat pipe 23-2 attached to the intermediate part of the leeward side and the leeward side of cooling air is 1st heat pipe 23-3 attached to the leeward side of cooling air (in FIG.5, 6, 6). The dimension in the width direction of the U-shaped portion in side view is larger than that of the two pieces on the leeward side.

  In the cooling device 21 according to the second embodiment, the first heat pipe 23 having a large U-shaped widthwise dimension is arranged on the windward side, so that it is cooled by the first heat pipe 23 arranged on the windward side. The obstruction of the wind flow is suppressed, and the cooling wind pressure and wind power reduction on the leeward side can be suppressed. As a result, the cooling capacity on the leeward side is further improved without impairing the cooling capacity on the leeward side, and the temperature between the heating elements 200 on the leeward side and the leeward side can be made more uniform.

  As shown in FIG. 6, in the cooling device 21 according to the second embodiment, the first heat pipe 23-1 and the 125 mm first heat pipe have dimensions in the width direction of the U-shaped portion in side view, respectively. 23-2, 100 mm first heat pipe 23-3 is attached, and heating elements 200-1, 200-2, 200-3 are arranged in the order of 1000 W, 200 W, 2000 W in the direction orthogonal to the flow direction of the cooling air. The cooling capacity of the cooling device 21 will be described by taking as an example a case where four heating element groups each arranged one by one are mounted in a direction parallel to the flow direction of the cooling air.

  As shown in FIG. 7, in this case, the temperature difference between the heating element 200 mounted on the most leeward side and the heating element 200 mounted on the most leeward side is the temperature difference of the conventional example 1 and the cooling device 1. The temperature difference between the 2000 W heating element 200-3 and the 200 W heating element 200-2 mounted next to the 2000 W heating element 200-3 is lower than the temperature difference. The same value of 10 ° C. was maintained as the difference. As with the cooling device 1, the cooling device 21 also has a first heat pipe 23 with a pipe diameter of 12.7 mm and a height of 170 mm.

  Next, a cooling device according to a third embodiment of the present invention will be described with reference to FIGS. In the cooling device 1 of the first embodiment, the radiating fins 7 are arranged at equal intervals in the vertical direction with respect to the surface of the heat receiving block 2. That is, in the cooling device 1, the radiating fin pitch is the same in all parts. Instead, as shown in FIG. 8, the cooling device 31 according to the third embodiment has the radiating fins arranged at equal intervals. A plurality of radiating fin groups are arranged in a direction parallel to the flow direction of the cooling air, and the radiating fin pitch of the radiating fin group arranged on the leeward side of the cooling air is arranged on the leeward side of the cooling air. It is larger than the radiating fin pitch of the radiating fin group.

  The cooling device 31 according to the third embodiment of the present invention, like the cooling device 1, has a flat plate-shaped heat receiving block 32 and a plurality of U-shaped side views attached to the surface of the heat receiving block 32 in the vertical direction. The first heat pipe 33, the plurality of heat radiation fins 37 attached to the first heat pipe 33, and the second heat pipe 35 thermally connected to the plurality of first heat pipes 33 are provided. Further, the first heat pipes 33 have the same dimensions and shape, and are linearly arranged so that the side surface portion that is U-shaped in a side view is parallel to the flow direction of the cooling air. A plurality of (six in FIG. 9) are arranged to form one first heat pipe group 34. Further, the first heat pipe group 34 is provided in a plurality of rows (19 rows in FIG. 9) in a direction orthogonal to the flow direction of the cooling air. The first heat pipe group 34 is in a state of being alternately shifted by a specific interval in a direction parallel to the flow direction of the cooling air.

  As shown in FIG. 9, in the cooling device 31, similarly to the cooling device 1, the second heat pipe 35 has a linear shape. The second heat pipe 35 has a plurality of (15 in FIG. 9) longitudinal directions arranged on the surface of the heat receiving block 32 in a direction perpendicular to the flow direction of the cooling air, and one second heat pipe group. 36 is formed.

  On the other hand, as shown in FIG. 8, the cooling device 31 includes a plurality of heat radiation fins 37 in which heat radiation fins 37 are arranged at equal intervals, that is, a plurality of heat radiation fins 37 having the same heat radiation fin pitch. A plurality (three in FIG. 8) of columns are arranged in parallel to the direction. The radiating fin pitch of the radiating fin group 38-1 disposed on the furthest upstream side of the cooling air is larger than the radiating fin pitch of the radiating fin group 38-2 disposed adjacent to the leeward side. The radiating fin pitch of the radiating fin group 38-3 arranged on the most leeward side of the cooling air is smaller than the radiating fin pitch of the radiating fin group 38-2 arranged adjacent to the upwind side. That is, the radiating fin group 38 disposed on the upstream side of the cooling air has a larger radiating fin pitch than the radiating fin group 38 disposed on the leeward side of the cooling air.

  A plurality (six in FIG. 8) of first radiating fins 37-1 are provided in the first radiating fin group 38-1 arranged on the most upstream side of the cooling air. The number of the second radiating fin group 38-2 arranged in the intermediate portion between the cooling wind and the leeward side is larger than that of the first radiating fin 37-1 of the first radiating fin group 38-1 (FIG. 8). 11 sheets) second radiation fins 37-2 are provided. The third radiating fin group 38-3 arranged on the most leeward side of the cooling air has a larger number than the second radiating fins 37-2 of the second radiating fin group 38-2 (21 in FIG. 8). Three radiation fins 37-3 are provided.

  As shown in FIG. 8, in the cooling device 31 according to the third embodiment, the relationship between the radiation fin pitches of the first radiation fin group 38-1 and the second radiation fin group 38-2 is an integral multiple, and the second heat radiation. The relationship between the fin group 38-2 and the third radiation fin group 38-3 is an integral multiple of the radiation fin pitch (in FIG. 8, the first radiation fin group 38-1, the second radiation fin group 38-2, the third radiation fin). The fin pitch of the group 38-3 is 4: 2: 1). The specific radiating fin pitch of each radiating fin group 38 can be appropriately selected according to the cooling capacity required by the cooling device 31. Here, the radiation fin pitch of the first radiation fin group 38-1 is 12 mm, the radiation fin pitch of the second radiation fin group 38-2 is 6 mm, and the radiation fin pitch of the third radiation fin group 38-3 is 3 mm.

  Furthermore, the first radiating fin group 38-1, the second radiating fin group 38-2, and the third radiating fin group 38-3 have the same radiating fin pitch phase. That is, on the same plane of each first radiation fin 37-1, the second radiation fin 37-2 of the predetermined second radiation fin group 38-2 and the third of the predetermined third radiation fin group 38-3. Radiating fins 38-3 are arranged. Further, another second heat radiation fin 37-2 and a third heat radiation fin 38-3 are arranged at a portion that divides the gap between the first heat radiation fins 37-1 into two equal parts. Further, another third heat radiating fin 37-3 is arranged at a part that divides the gap between the first heat radiating fins 37-1 into four equal parts.

  In the cooling device 31 according to the third embodiment, the dimensions of the first radiation fins 37-1 are 450 mm in width, 150 mm in length, and 0.5 mm in thickness, and the gap between the first radiation fins 37-1 is 12 mm. The dimensions of the second radiating fin 37-2 are 450 mm wide, 350 mm long and 0.5 mm thick, the gap between the second radiating fins 37-2 is 6 mm, and the dimensions of the third radiating fin 37-3 are , Width 450 mm, length 400 mm, thickness 0.5 mm, and the gap between the third radiation fins 37-3 is 3 mm.

  By adopting such a radiation fin arrangement, the second radiation fin 37-2 and the third radiation fin 37-3 are prevented from becoming a barrier to the flow of the cooling air, and the amount and speed of the cooling air are reduced. The loss due to the pressure of the second radiation fin 37-2 and the third radiation fin 37-3 can be suppressed. Therefore, the cooling air that has passed through the first radiating fin group 38-1 is in the second radiating fin group 38-2 and the second radiating fin group 38-disposed on the leeward side of the first radiating fin group 38-1. In the third radiating fin group 38-3 arranged on the leeward side 2, the cooling ability on the leeward side is further improved by flowing smoothly. Furthermore, since the radiating fin group 38 increases the number of radiating fins 37 installed, the radiating area of the radiating fins 37 is increased, so that the cooling capacity on the leeward side is further improved. . As a result, the cooling capacity on the leeward side is further improved without impairing the cooling capacity on the leeward side, and the temperature between the heating elements 300 on the leeward side and the leeward side can be made more uniform.

  Next, a cooling device according to a fourth embodiment of the present invention will be described with reference to FIGS. In the cooling devices 1, 21, and 31 according to the above embodiments, the first heat pipes 3, 23, and 33 each have a U-shaped side surface portion with respect to the flow direction of the cooling air. Although arranged so as to be parallel to each other, instead of this, as shown in FIGS. 10 and 11, the first heat pipe 53 of the cooling device 51 according to the fourth embodiment example is U-shaped in a side view. The side portions are arranged so as to be orthogonal to the flow direction of the cooling air. Accordingly, in each of the above embodiments, the second heat pipes 5, 25, and 35 are attached so that the longitudinal direction thereof is orthogonal to the flow direction of the cooling air. The second heat pipe 55 of the cooling device 51 according to the fourth embodiment is attached such that its longitudinal direction is parallel to the flow direction of the cooling air.

  The cooling device 51 according to the fourth embodiment of the present invention, like the cooling device 1, has a flat plate-shaped heat receiving block 52 and a plurality of U-shaped side views attached to the surface of the heat receiving block 52 in the vertical direction. The first heat pipe 53, the plurality of heat radiation fins 57 attached to the first heat pipe 53, and the second heat pipe 55 thermally connected to the plurality of first heat pipes 53 are provided.

  In the cooling device 51 according to the fourth embodiment, as shown in FIG. 11, the first heat pipe 53 includes a first heat pipe 53-1 having a relatively small dimension in the width direction of the U-shaped portion when viewed from the side. And the 1st heat pipe 53-2 in which the dimension of the width direction of the portion of U character side view is relatively large is used. In the cooling device 51, the first heat pipes 53-1 have regions that are arranged in a straight line in a direction parallel to the flow direction of the cooling air, and similarly for the first heat pipe 53-2. Also, they have regions arranged on a straight line in a direction parallel to the flow direction of the cooling air. Further, like the cooling device 1, the second heat pipe 55 of the cooling device 51 has a linear shape. A plurality of (six in FIG. 11) longitudinal directions of the second heat pipes 55 are arranged on the surface portion of the heat receiving block 52 in a direction parallel to the flow direction of the cooling air, and one second heat pipe group 56. Is formed. The second heat pipe 55 is disposed so as to be positioned at the U-shaped bottom of the first heat pipe 53. In the cooling device 51 according to the fourth embodiment, the windward side has a relatively high cooling capacity compared to the leeward side, and therefore the predetermined first heat pipe provided on the windward side includes the first heat pipe. The two heat pipes 55 are not arranged.

  As shown in FIG. 10, the cooling device 51 includes a plurality of heat radiation fins 57 in which heat radiation fins 57 are arranged at equal intervals, that is, a plurality of heat radiation fins 57 with the same heat radiation fin pitch. A plurality (two in FIG. 10) are arranged in parallel in the parallel direction. For the two radiating fin groups 58, the radiating fin pitch of the leeward radiating fin group 58-1 having the radiating fins 57-1 is the radiating fin of the leeward radiating fin group 58-2 having the radiating fins 57-2. It is twice the pitch. In addition, the radiating fin pitch of the radiating fin group 58-1 and the radiating fin pitch of the radiating fin group 58-2 on the leeward side are aligned with each other.

  In the cooling device 51 according to the fourth embodiment, the side surfaces of the first heat pipe 53 that are U-shaped in a side view are arranged so as to be orthogonal to the flow direction of the cooling air, and the second heat The longitudinal direction of the pipe 55 is arranged in a direction parallel to the flow direction of the cooling air, so that the second heat pipe 55 performs heat transport in a direction parallel to the flow direction of the cooling air. Therefore, the cooling device 51 is similar to the cooling devices 1, 21, and 31 according to each of the above embodiments, so that the soaking effect between the heating elements, in particular, the heating element on the windward side of the cooling air and the heating element on the leeward side Has a soaking effect between.

  As shown in FIG. 12, in the cooling device 51 according to the fourth embodiment, the heating elements 500-1, 500-4, 500 are arranged in the order of 1600 W, 800 W, 1500 W in the direction orthogonal to the flow direction of the cooling air. In the case where three heating element groups each having -7 are mounted in parallel to the flow direction of the cooling air, that is, 1600 W heating elements are 500-1 from the windward side to the leeward side. , 500-2, 500-3, 3 rows, 800 W heating elements from the windward side to the leeward side 500-4, 500-5, 500-6, 3 rows, 1500 W heating elements from the windward side, to the leeward side 500 The cooling capacity of the cooling device 51 will be described by taking, as an example, the case where the mounting is performed in -7, 500-8, and 500-9, respectively.

  In the cooling device 51 according to the fourth embodiment, the heat receiving block 52 has a width of 500 mm, a length of 1000 mm, and a thickness of 25 mm, and 54 first heat pipes 53-1 have a pipe diameter. 12.7 mm, height 170 mm, width-wise dimension 100 mm in side view, 21 first heat pipes 53-2 are provided with a pipe diameter of 12.7 mm, height 170 mm, side-view U-shape The dimension in the width direction of this part is 150 mm. The dimensions of the second heat pipe 55 that is linear are a pipe diameter of 6 mm and a length of 400 mm. The cross-sectional shapes of the first heat pipe 53 and the second heat pipe 55 are both circular. The number of the radiation fins 57-1 was 20, the number of the radiation fins 57-2 was 39, and the dimensions were all 450 mm in width, 350 mm in length, and 0.5 mm in thickness. The gap between the radiation fins 57-1, that is, the radiation fin pitch, was 6 mm, and the radiation fin pitch of the radiation fins 57-2 was 3 mm.

  In the cooling device 51 according to the fourth embodiment, the heat generating element 500 having the highest temperature is the heat generating element 500-6, which is 54.7 ° C. It was heating element 500-7 and was 47.3 ° C. Therefore, in the cooling device 51, the maximum temperature difference between the heating elements 500 was 7.4 ° C. On the other hand, with respect to the cooling device 51, the side surface portion of the first heat pipe, which is U-shaped when viewed from the side, is arranged in a direction parallel to the flow direction of the cooling air, and the longitudinal direction of the second heat pipe is In the cooling device in which the arrangement is changed in a direction orthogonal to the flow direction of the cooling air, the heating element 500 having the highest temperature is the heating element 500-6, which is 59.6 ° C., and can suppress the temperature rise most. The heater element 500 was a heater element 500-8 and had a temperature of 52.4 ° C. Therefore, in this cooling device, the maximum temperature difference between the heating elements 500 was 7.2 ° C. Accordingly, the first heat pipes 53 are arranged so that the side surface portion that is U-shaped in a side view is orthogonal to the flow direction of the cooling air, and accordingly, the second heat pipe 55 is Even if the longitudinal direction is arranged in parallel to the flow direction, a soaking effect equivalent to that of the cooling devices 1, 21, and 31 according to the above embodiments is exhibited.

  Next, an example of a method for manufacturing the cooling device of the present invention will be described with reference to FIG. Here, the cooling device 1 of Embodiment 1 will be described as an example. As shown in FIG. 13A, recesses 11 are formed on the surface of the heat receiving block 2 at locations corresponding to the attachment positions of the first heat pipe 3 that is U-shaped in a side view. The recess 11 has a size and shape that can be fitted to the bottom of the first heat pipe 3 that is U-shaped. Moreover, the groove part 12 is formed in the location corresponding to the attachment position of the linear 2nd heat pipe 5 in the orthogonal direction with respect to the recessed part 11, respectively. The groove portion 12 has a size and shape that allows the entire second heat pipe 5 to be fitted. The depth of the groove 12 is shallower than the depth of the recess 11 by the pipe diameter of the first heat pipe 3.

  First, a plurality of first heat pipes 3 are erected and fixed in the vertical direction with respect to the surface of the heat receiving block 2 by fitting the bottom portions of the first heat pipes 3 into the respective recesses 11 on the surface of the heat receiving block 2 ( FIG. 13 (b)). Next, the plurality of second heat pipes 5 are arranged and fixed to the heat receiving block 2 by fitting the second heat pipes 5 into the respective groove portions 12 on the surface of the heat receiving block 2. At this time, since the depth of the groove 12 is shallower than the depth of the recess 11 by the pipe diameter of the first heat pipe 3, the bottom surface of the first heat pipe 3 and the surface of the second heat pipe 5 are The first heat pipe 3 and the second heat pipe 5 are in thermal contact with each other (FIG. 13 (c)). The radiating fin 7 is provided with a hole (not shown) having a shape corresponding to the cross-sectional shape of the first heat pipe 3 at a position corresponding to the size and arrangement of the first heat pipe 3. After the first heat pipes 3 are installed in all the recesses 11 and the second heat pipes 5 are installed in all the groove parts 12 (FIG. 13D), the installed first heat pipes 3 are connected to the holes of the radiation fins 7. The heat radiating fins 7 are attached to the first heat pipes 3 by being fitted to the parts. At this time, when the surface of the first heat pipe 3 comes into contact with the inner wall surface of the hole of the radiating fin 7, the first heat pipe 3 and the radiating fin 7 are thermally connected (FIG. 13 (e)). Thus, the cooling device of the present invention is manufactured by installing the first heat pipe and the second heat pipe in the heat receiving block and attaching the radiation fins to the installed first heat pipe.

  Next, the usage method of the cooling device of this invention is demonstrated. Here, the cooling device 1, 21 and 31 according to the above-described embodiment of the present invention will be described by taking as an example a usage method for cooling an electrical component (for example, a power conversion device) mounted on a moving body (for example, a railway vehicle). . A casing for power control, which is cut off from the outside, is fixed to the lower surface of the floor of the railway vehicle, and various electrical components for controlling power, such as a power converter, are stored in the casing. These electrical components generate heat during operation. If the heat generation is left as it is, the temperature rises and normal operation cannot be performed. In the worst case, the element may be destroyed by heat. Therefore, it is necessary to cool these electrical components.

  The electrical components (hereinafter referred to as heating elements) are brought into contact with the heat receiving blocks 2, 22, 32 of the cooling devices 1, 21, 31 to be thermally connected to the heat receiving blocks 2, 22, 32. A fan for supplying cooling air to the cooling devices 1, 21, 31 is installed in the housing in which the heat generating elements are stored. At this time, the fan and the cooling devices 1, 21, and 31 are installed so that the flow direction of the cooling air blown from the fan is parallel to the surface of the heat receiving blocks 2, 22, and 32. In the case of the cooling device 31, the first radiating fin group 38-1 having a large radiating fin pitch is further installed on the upstream side of the cooling air.

  Next, other embodiments of the present invention will be described. In the first to third embodiment examples, the second heat pipe is thermally applied to all the first heat pipes arranged in a straight line in a direction orthogonal to the flow direction of the cooling air. Although connected, the 1st heat pipe which connects the 2nd heat pipe thermally can be suitably selected according to the exothermic state of a plurality of exothermic elements mounted in a cooling device. For example, instead of all the first heat pipes arranged on the straight line instead of the above-described aspect, some of the first heat pipes that are thermally connected to the region of the heat receiving block where the temperature difference between the heating elements is large A second heat pipe may be arranged specifically between the first heat pipes. In the fourth embodiment, the second heat pipe is not arranged in the predetermined first heat pipe provided on the windward side, that is, the second heat pipe is not thermally connected. However, for each of the first heat pipes arranged in a straight line in a direction parallel to the flow direction of the cooling air, including the first heat pipe provided on the windward side, the second heat pipe is heated. May be connected to each other.

  In the first embodiment to the third embodiment, the first heat pipe group is provided in a plurality of rows in a direction orthogonal to the flow direction of the cooling air, and the first heat pipe group is formed with respect to the flow direction of the cooling air. Although the specific intervals are alternately shifted in the parallel direction, the arrangement relationship of the first heat pipes is not limited to this, and can be appropriately selected. For example, instead of the arrangement relationship, the first heat pipe group may be arranged in a plurality of rows in a state where the first heat pipe group is shifted by a predetermined angle other than the orthogonal direction with respect to the flow direction of the cooling air. In this case, the second heat pipe is perpendicular to the longitudinal direction of the U-shaped bottom portion of the first heat pipe, the longitudinal direction being a predetermined angle other than the orthogonal direction, that is, the cooling air flow direction. You may arrange | position so that it may have predetermined angles other than.

  In each of the above embodiments, the heat pipe is used as the first heat conducting member and the second heat conducting member, but instead, a metal having excellent heat conductivity, for example, heat conductivity at 25 ° C. Aluminum, copper, or the like having a power of 100 W / (m · K) or more may be used. Moreover, in each said embodiment, although the 2nd heat pipe was arrange | positioned in the bottom part of the 1st heat pipe of the U-shape by the side view, and this heat sink side of this bottom, it replaces with this and heat dissipation of this bottom part The second heat pipe may be disposed on the side opposite to the fin side, and the second heat pipe may be disposed on both the bottom side of the radiating fin side and the side of the bottom side opposite to the radiating fin side.

  In each of the above embodiments, the shape of the first heat pipe is a U shape when viewed from the side, but may be an L shape when viewed from the side instead. Moreover, in each said embodiment, although the radiation fin was arrange | positioned at equal intervals, you may provide a change suitably in the space | interval of a radiation fin.

  Even when a plurality of heat generating elements having different heat generation amounts are mounted, the temperature between the heat generating elements is made uniform and the generation of heat generating elements that are difficult to be cooled can be prevented. Therefore, a cooling device that cools various types of heat generating elements, for example, railways The utility value is high in fields such as a cooling device that cools a large number of heating elements mounted on a vehicle by forced air cooling.

1, 21, 31, 51 Cooling device 2, 22, 32, 52 Heat receiving block 3, 23, 33, 53 First heat pipe 5, 25, 35, 55 Second heat pipe 7, 27, 37, 57 Radiating fin 8 , 28, 38, 58 Radiation fin group

Claims (4)

A heat receiving block that can be thermally connected to a plurality of heat generating elements having different heat generation amounts, a plurality of side-view U-shaped heat pipes that are thermally connected to the heat-receiving block, and the plurality of side-view U-shaped heats A cooling device comprising a heat radiation fin thermally connected to a pipe , wherein a flow of cooling air is set in a direction parallel to the surface of the heat receiving block,
Said mounting et al is the surface of the heat receiving block, the plurality of bottom of the side view the U-shaped heat pipe, the linear heat pipe by being mounted et the contact a linear heat pipe to the surface and is thermally connected, the plurality of side view the U-through straight linear heat pipe provided in the direction in which the longitudinal direction of the linear heat pipe is orthogonal to the side surface of the side view the U-shaped heat pipe Shaped heat pipes are thermally connected to each other,
The back surface of the heat receiving block to which the U-shaped heat pipe and the linear heat pipe are not attached is a surface for mounting the heat generating element, and the linear heat pipe has a relative calorific value. From the U-shaped heat pipe that is thermally connected at the portion of the heat receiving block corresponding to the position of the heat generating element that is relatively large, it corresponds to the position of the heat generating element that generates a relatively small amount of heat. A cooling device , wherein the heat transferred from the heat receiving block is transported to the U-shaped heat pipe that is thermally connected to the heat receiving block . Before SL widthwise dimension of the side view the U-shaped portions, the cooling air erected the side view the U-upwind of the cooling air from the leeward side view standing on side U-shaped heat pipe The cooling device according to claim 1, wherein the heat pipes have a larger arrangement.   A plurality of radiating fin groups provided with a plurality of the radiating fins are arranged in tandem along the flow direction of the cooling air, and among the plurality of radiating fin groups, the radiating fin group arranged on the windward side of the cooling air. 2. The cooling device according to claim 1, wherein a radiation fin pitch is larger than a radiation fin pitch of a radiation fin group disposed on the leeward side of the cooling air. The cooling device according to claim 3 , wherein a radiating fin pitch of the radiating fin group arranged on the leeward side is an integral multiple of a radiating fin pitch of the radiating fin group arranged on the leeward side.

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