JP5653852B2 - Cooling system - Google Patents

Description

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

  As a conventional cooling device, there is a cooling device 41 (hereinafter referred to as Conventional Example 1) 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 heat radiating fin group 46 having a plurality of heat radiating fins 45 attached thereto. The radiating fin pitch between the radiating fins 45 is formed so as to be uniform in any part (Patent Document 1).

  In the cooling device 41 of Conventional Example 1, it is necessary to increase the heat radiation area of the heat radiation fin group 46 in order to improve the cooling performance. At this time, in order to increase the heat radiation area, it is necessary to lengthen the size of the heat radiation fin 45 in the flow direction of the cooling air. However, if the size of the heat radiating fins 45 is increased in the flow direction of the cooling air, the pressure of the cooling air flowing between the heat radiating fins 45 is remarkably reduced as it proceeds to the leeward side. Therefore, in the cooling device 41 of the conventional example 1, the cooling capacity is greatly different between the leeward side and the leeward side. For example, the heat receiving block 42 is mounted with electrical components (heating elements) that generate heat respectively on the windward side and the leeward side of the cooling air (in FIG. 6B, three in parallel on the windward side of the cooling air and in parallel on the leeward side). 3) and the heat generating element 400-2 arranged on the leeward side is less likely to be cooled by the pressure loss of the cooling air due to the radiating fins 45 than the heat generating element 400-1 arranged on the upwind side. There was a problem that the decrease in the amount was suppressed.

  Therefore, as shown in FIG. 8, in the cooling device 41 ′ (hereinafter referred to as Conventional Example 2) that shortens the size of the radiating fin 45 in the flow direction of the cooling air, the pressure loss of the cooling air is reduced. The cooling capacity with respect to the heating element 400-2 arranged in FIG. However, in the conventional example 2, from the relationship between the size of the radiating fins and the arrangement of the heat pipes, the U-shaped heat pipe 43 disposed on the windward side and the leeward side is replaced with the L-shaped heat pipe 43 ′. Therefore, there is a problem that the cooling capacity for the heating element 400-1 disposed on the windward side is lowered.

JP-A-9-119785

  As described above, in the conventional cooling device, the cooling capacity for the heating elements arranged on the leeward side or the cooling capacity for the heating elements arranged on the leeward side is lowered. Therefore, when a plurality of heat generating elements are mounted on the cooling device, there are heat generating elements that cannot be sufficiently cooled depending on the portion of the heat receiving block, that is, the mounting position of the heat generating elements.

  The present invention has been made in view of the above-described problems of the prior art, and even without increasing the heat radiation area, the cooling capacity on the upstream side of the cooling air and the cooling capacity on the leeward side of the cooling air are excellent. It is an object of the present invention to provide a cooling device that can reduce the temperature difference even when a plurality of heating elements are mounted.

Aspects of the present invention include a heat receiving block that can be thermally connected to a heat generating element, a side view U-shaped heat pipe whose bottom is thermally connected to the heat receiving block, and a side view U-shaped heat pipe . And a cooling device in which a flow of cooling air is set in a direction parallel to the surface of the heat receiving block, wherein the heat radiation fin group includes: The intermediate portion between the portion on the upstream side of the cooling air and the portion on the leeward side of the cooling air is smaller than the heat radiation fin pitch on the portion on the windward side of the cooling air and the heat radiation fin pitch on the portion on the leeward side of the cooling air. A cooling device comprising a fin pitch, wherein the surface of the radiating fin is parallel to the flow direction of the cooling air.

  In this aspect, the radiation fin group is provided with portions having different radiation fin pitches. That is, in one radiating fin group that is a component of the cooling device, a portion on the leeward side of the cooling air (sometimes referred to as “windward”) and a portion on the leeward side of the cooling air (referred to as “windward”). The pitch of the radiating fins in the intermediate part is smaller than the pitch of the radiating fins in the part upstream of the cooling air from the intermediate part and the pitch of the radiating fins in the part leeward of the cooling air from the intermediate part. Is smaller than

  In this way, the heat radiation fin pitch at the middle part of the heat radiation fin group is made smaller than the heat radiation fin pitch at the windward side of the same heat radiation fin group and the heat radiation fin pitch at the windward side of the same heat radiation fin group. The pressure of the cooling air flowing through the fin group and the wind force are prevented from decreasing as they proceed to the leeward side of the radiating fin group.

  In this aspect, since the radiating fin pitch at the windward side of the radiating fin group is relatively larger than the radiating fin pitch at the intermediate part, the cooling air flows relatively smoothly at the windward side of the radiating fin group. The cooling air that has passed smoothly through the windward portion of the radiating fin group flows to an intermediate portion having a radiating fin pitch smaller than the radiating fin pitch at the leeward portion of the radiating fin group. At this time, since the radiating fin pitch in the intermediate portion is relatively smaller than the radiating fin pitch in the windward portion, the radiating fins serve as resistance to the flow of cooling air in the intermediate portion. However, the leeward portion has a relatively large radiating fin pitch than the intermediate radiating fin pitch, that is, the spacing between the radiating fins in the leeward portion is wider than the spacing between the intermediate radiating fins, It is easy to pass through the intermediate portion, and loss of the cooling air pressure at the intermediate portion can be suppressed. Therefore, it is thought that it can suppress that the pressure of a cooling wind and a wind force fall in a windward part. In addition, since the radiating fins of the radiating fin group are arranged with a relatively large radiating fin pitch in both the windward and leeward parts with respect to the middle part, even when the wind direction of the cooling air is reversed A similar effect can be obtained.

  The “thermal conducting member” is a member having excellent thermal conductivity, such as a heat pipe or a metal having a thermal conductivity at 25 ° C. of 100 W / (m · K) or more (eg, aluminum, copper). Is mentioned.

  An aspect of the present invention is the cooling device characterized in that the radiating fin pitch at the leeward portion and the radiating fin pitch at the leeward portion are the same.

  An aspect of the present invention is the cooling device characterized in that the radiating fin pitch in the leeward portion and the radiating fin pitch in the leeward portion are an integral multiple of the radiating fin pitch in the intermediate portion.

Aspects of the present invention include a heat receiving block that can be thermally connected to a heat generating element, a side view U-shaped heat pipe whose bottom is thermally connected to the heat receiving block, and a side view U-shaped heat pipe . A cooling fin in which a flow of cooling air is set in a direction parallel to the surface of the heat receiving block, and the cooling fin group includes the cooling fin group. A plurality of radiating fins arranged in tandem along the flow direction of the wind, and among the plurality of radiating fin groups, a radiating fin group arranged in an intermediate portion between the leeward side and the leeward side of the cooling air The heat dissipating fin group has a heat dissipating fin pitch that is smaller than the heat dissipating fin pitch of the heat dissipating fin group and the heat dissipating fin pitch of the heat dissipating fin group that is disposed on the leeward side of the cooling air, and the surface of the heat dissipating fin is the flow direction of the cooling air In A cooling device which is a direction parallel to.

  In this aspect, the pitch of the radiation fins of at least one of the plurality of radiation fin groups is different from the pitch of the radiation fins of the other radiation fin groups. That is, among the plurality of radiating fin groups arranged in parallel or substantially parallel to the flow direction of the cooling air, the pitch of the radiating fins of the radiating fin group arranged in the intermediate portion between the upwind side and the leeward side of the cooling air Is smaller than the pitch of the radiating fins of the radiating fin group arranged on the upstream side of the cooling air from the intermediate part and smaller than the pitch of the radiating fins of the radiating fin group arranged on the leeward side of the cooling air from the intermediate part. It has become.

  As described above, among the plurality of heat dissipating fin groups provided in the direction parallel to the flow direction of the cooling air, the heat dissipating fin pitch of the heat dissipating fin group disposed in the intermediate portion is set to the heat dissipating fin disposed on the windward side. In the group of radiating fins in which the pressure of the cooling air flowing in the radiating fin group and the wind force are arranged in the leeward direction by making it smaller than the radiating fin pitch of the radiating fin group and the radiating fin pitch arranged on the leeward side of the group. Suppresses the decline as it goes to.

  In this aspect, a mechanism capable of suppressing the pressure of the cooling air and the decrease of the wind force in the radiating fin group arranged on the leeward side will be described. Since the radiating fin pitch of the radiating fin group arranged on the windward side is relatively larger than the radiating fin pitch of the radiating fin group arranged on the middle part, in the radiating fin group on the upwind side, the cooling air is relatively Flows smoothly. The cooling air that has passed smoothly through the leeward radiating fin group has a radiating fin pitch smaller than the radiating fin pitch of the leeward radiating fin group, and is arranged on the leeward side of the leeward radiating fin group. It flows to the radiating fin group, that is, the radiating fin group disposed in the intermediate portion. At this time, since the radiating fin pitch of the intermediate radiating fin group is relatively smaller than the radiating fin pitch of the leeward radiating fin group, the radiating fin in the intermediate radiating fin group becomes resistance to the flow of cooling air. . However, the radiating fin group arranged on the leeward side is a radiating fin pitch relatively larger than the radiating fin pitch of the radiating fin group arranged on the intermediate part, that is, the radiating fin group arranged on the leeward side. Since the spacing between the radiating fins is wider than the spacing between the radiating fins of the radiating fin group arranged in the intermediate part, the cooling air easily escapes through the radiating fin group arranged in the intermediate part, and the radiating fin arranged in the intermediate part Loss of cooling air pressure in the fin group can be suppressed. Therefore, it is thought that it can suppress that the pressure of a cooling wind and a wind force fall in the radiating fin group on the leeward side. In addition, since the radiating fin group arranged on the leeward side and the radiating fin group arranged on the leeward side have a relatively large radiating fin pitch with respect to the radiating fin group arranged in the middle part, The same effect can be obtained even when the direction of the cooling air is reversed.

  In the specification, the “radiating fin group” means a group of radiating fins in which a plurality of radiating fins or predetermined portions of the radiating fins are arranged on a straight line in a direction perpendicular to the flow direction of the cooling air.

  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 and the radiating fin pitch of the radiating fin group arranged on the leeward side are the same.

  According to an aspect of the present invention, the radiating fin pitch of the radiating fin group disposed on the leeward side and the radiating fin pitch of the radiating fin group disposed on the leeward side are the radiating fins of the radiating fin group disposed on the intermediate portion. It is a cooling device characterized by being an integral multiple of the pitch.

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

  An aspect of the present invention is the cooling device, wherein the heat pipe is U-shaped or L-shaped in a side view.

  According to the aspect of the present invention, since the cooling capacity on the upstream side of the cooling air and the cooling capacity on the downstream side of the cooling air are both excellent, even if a plurality of heating elements having different heat generation amounts are mounted on one cooling device, It is possible to prevent the heating element mounted on the leeward side of the wind from becoming less cooled than the heating element mounted on the leeward side. In addition, since the difference in cooling capacity due to the mounting position of the heating element can be reduced, the heating element with a relatively large amount of heat generation is less likely to be cooled than other heating elements with a relatively small amount of heat generation. The temperature difference between the heating elements can be made uniform. In addition, even if the heat dissipation area is reduced, the cooling capacity is improved, that is, the cooling capacity is improved even if the area of the heat dissipation fin is made smaller than before, so that the cooling device can be reduced in size and weight, and the manufacturing cost is also increased. Can be reduced. Furthermore, since the radiating fin pitch on the leeward side and the radiating fin pitch on the leeward side can be set wider than before, the pressure of the cooling air can be suppressed from being lost by the radiating fins, and the cooling capacity on the leeward side is improved. be able to.

  According to the aspect of the present invention, since the leeward radiating fin pitch and the leeward radiating fin pitch are the same, the leeward cooling capability can be made closer to the leeward cooling capability. Therefore, the cooling capacity on the windward side and the leeward side can be made more uniform.

  According to the aspect of the present invention, since the radiating fin pitch on the leeward side and the leeward side is an integral multiple of the radiating fin pitch on the intermediate part, the phase between the radiating fin pitch on the intermediate part and the radiating fin pitch on the leeward and leeward side is It is possible to arrange them, and it is possible to suppress the loss of the pressure of the cooling air flowing through the radiating fin group due to the radiating fins.

It is a perspective view of the cooling device concerning the example of a 1st embodiment of the present invention. 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 plurality of exothermic elements were 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 plurality of exothermic elements were attached. It is a perspective view of the cooling device concerning the example of a 2nd embodiment of the present invention. It is a cooling device concerning the 2nd example of an embodiment of the present invention, and is a side view in the state where a plurality of exothermic elements were attached. (A) is a perspective view of a cooling device according to a conventional example, and (b) is an explanatory view showing a state in which a plurality of heating elements are mounted on the cooling device according to the conventional example. It is a cooling device concerning a conventional example, and is a top view in the state where a plurality of exothermic elements were attached. It is a perspective view of the cooling device concerning other conventional examples. It is a cooling device concerning other conventional examples, and is a top view in the state where a plurality of exothermic elements were attached.

  The cooling device according to the first embodiment of the present invention will be described below with reference to FIGS. 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 heat pipes 3 and a plurality of radiating fins 5, 5 ′ attached to the heat pipe 3 are provided. The shape of the heat pipe 3 is U-shaped in side view (U-shaped heat pipe 3-1 in side view) or L-shaped in side view (L-shaped heat pipe 3-2 in side view). In the cooling device 1 according to the first embodiment, the dimensions and shape are the same for the U-shaped heat pipe 3-1 when viewed from the side, and the dimensions are the same for the L-shaped heat pipe 3-2 when viewed from the side. The shape is the same. A plurality of heat pipes 3 are arranged on a straight line such that the side surface portion that is U-shaped or L-shaped in side view is parallel to the flow direction of the cooling air, and one heat pipe group 4 is formed. Is formed.

  The number of heat pipes 3 constituting one heat pipe group 4 can be appropriately selected according to the required cooling capacity and the size of the cooling device 1. As shown in FIG. 3, the heat pipe group 4 provided in the cooling device 1 includes a heat pipe group 4-1 including three U-shaped heat pipes 3-1 in a side view and three U-shapes in a side view. In addition to the heat pipe 3-1, there are two patterns of a heat pipe group 4-2 in which one L-shaped heat pipe 3-2 in side view is arranged on the uppermost side of the cooling air. Each of the heat pipe group 4-1 and the heat pipe group 4-2 is provided in a plurality of rows (17 rows in the figure) in a direction orthogonal to the flow direction of the cooling air. Further, the heat pipe groups 4-1 and the heat pipe groups 4-2 are alternately arranged. Therefore, in the cooling device 1, 51 pieces of the U-shaped heat pipes 3-1 in a side view and eight pieces of L-shaped heat pipes 3-2 in a side view are attached to the heat receiving block 2. Furthermore, the heat pipe group 4-1 and the heat pipe group 4-2 have an arrangement relationship that is shifted by a specific distance in the direction parallel to the flow direction of the cooling air. In addition, about the side view U-shaped heat pipe 3-1 and the side view L-shaped heat pipe 3-2, it is not limited to the aspect which has the same dimension and shape as above, and is an obstruction. If necessary, the dimensions and shapes of the predetermined U-shaped heat pipe 3-1 and the L-shaped heat pipe 3-2 in side view may be appropriately changed.

  The radiation fins 5 and 5 'are rectangular thin plates. The radiating fins 5 and 5 'are attached so that the surfaces thereof are parallel or substantially parallel to the flow direction of the cooling air. Further, the surfaces of the heat radiation fins 5, 5 ′ are parallel to or substantially parallel to the surface of the heat receiving block 2. A plurality of the radiation fins 5, 5 ′ are arranged at a predetermined interval in the direction perpendicular to the surface of the heat receiving block 2, thereby forming one radiation fin group 6. Thus, the cooling air smoothly flows through the radiating fin group 6.

  In the cooling device 1, one radiating fin group 6 includes a radiating fin group portion 2 in which a plurality of radiating fins 5, 5 ′ having the same size and shape are arranged at equal intervals t in the vertical direction with respect to the surface of the heat receiving block 2. It is formed from one. That is, one radiating fin group 6 is provided on the leeward side of the cooling wind of the windward radiating fin group portion 7 and in a direction parallel to the windward radiating fin group portion 7 and the flow direction of the cooling air. The leeward side radiating fin group portion 8 is formed. That is, in the leeward side radiating fin group portion 7, a plurality of radiating fins 5 are arranged at equal intervals t in the direction perpendicular to the surface of the heat receiving block 2, and in the leeward side radiating fin group portion 8, the radiating fin 5 ′. Are arranged at equal intervals t in the direction perpendicular to the surface of the heat receiving block 2. The radiating fin 5 of the leeward radiating fin group portion 7 and the radiating fin 5 ′ of the leeward side radiating fin group portion 8 have the same size and shape. Each radiating fin 5 of the leeward radiating fin group portion 7 and each radiating fin 5 ′ of the leeward side radiating fin group portion 8 are half the width t of the interval t in the direction perpendicular to the surface of the heat receiving block 2 ( 0.5t) are attached in a shifted positional relationship. And the leeward side portion of the leeward radiating fin group portion 7 and the leeward side portion of the leeward side radiating fin group portion 8 are alternately overlapped in the direction perpendicular to the surface of the heat receiving block 2, that is, the heat receiving block 2. Stacked portions 9 are formed by alternately stacking layers in the direction perpendicular to the surface. That is, in the laminated portion 9, the predetermined portion on the lee side of the radiating fin 5 of the leeward radiating fin group portion 7 and the predetermined portion on the leeward side of the radiating fin 5 ′ of the leeward side radiating fin group portion 8 of the heat receiving block 2 Alternatingly arranged in a direction perpendicular to the surface. Thus, the radiating fin group 6 of the cooling device 1 includes the leeward side portion (that is, the windward side) of the leeward side radiating fin group portion 7 and the leeward side portion of the leeward side radiating fin group portion 8 (that is, the leeward side). And a laminated portion 9 (that is, an intermediate portion) in an intermediate portion between the leeward side portion of the leeward side radiating fin group portion 7 and the leeward side portion of the leeward side radiating fin group portion 8.

  Therefore, in the laminated portion 9, the radiation fins 5, 5 ′ are perpendicular to the surface of the heat receiving block 2, with an interval of 0.5 t, that is, the radiation fins 5 and the leeward radiation fins of the windward radiation fin group portion 7. They are arranged at a half interval with respect to the interval t between the heat radiating fins 5 ′ of the group 8. Therefore, the radiating fin pitch of the windward radiating fin group portion 7 and the radiating fin pitch of the leeward radiating fin group portion 8 are equal, and the radiating fin pitch of the laminated portion 9 is equal to the radiating fin pitch of the windward radiating fin group portion 7 and This is twice the pitch of the radiating fins of the leeward side radiating fin group 8. Thus, by making the radiation fins 5 of the windward radiation fin group portion 7 and the radiation fins 5 ′ of the leeward radiation fin group portion 8 the same shape, the laminated portion 9 is twice as large as the windward and leeward portions. The radiating fin group 6 can have a symmetrical shape with the laminated portion 9 as the center. In order to form the symmetrical shape, it is not necessary to increase the types of the radiating fins 5 and 5 ', and the number of parts can be reduced.

  Since the radiating fin 5 of the leeward radiating fin group portion 7 and the radiating fin 5 ′ of the leeward radiating fin group portion 8 have the same size and shape, the side surfaces of the radiating fin group 6 are The 5 ′ edges are aligned.

  The radiation fins 5, 5 'and the heat receiving block 2 are all 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 heat pipe 3 is also made of the same metal material as the heat radiation fins 5, 5 ′ and the heat receiving block 2. The working fluid of the heat pipe 3 is sealed in a decompressed state with a working fluid that matches the compatibility with the container material. For example, when the container is copper, the working fluid uses pure water.

  By mounting the heat generating element 100 as the cooled object on the back surface of the heat receiving block 2 corresponding to the side where the heat pipe 3 and the heat radiating fins 5, 5 ′ are not attached, the cooling device 1 and the heat generating element 100 are connected. Thermal connection is possible.

  In the cooling device 1 according to the first embodiment, the radiating fins 5, 5 ′ have a dimension (width) in the direction perpendicular to the flow direction of the cooling air of 500 mm and a dimension in a direction parallel to the flow direction of the cooling air. The (length) is 350 mm and the thickness is 0.5 mm. A plurality of the radiating fins 5 of the leeward radiating fin group portion 7 and the radiating fins 5 ′ of the leeward radiating fin group portion 8 are arranged at regular intervals (6 mm intervals) in the direction perpendicular to the surface of the heat receiving block 2. (15 in the embodiment shown in FIGS. 1 and 2) are arranged. Therefore, the gap between the radiating fins 5 and the gap between the radiating fins 5 'are 5.5 mm, respectively. Further, in the laminated portion 9 in which the radiating fins 5 of the leeward side radiating fin group portion 7 and the radiating fins 5 ′ of the leeward side radiating fin group portion 8 are alternately arranged in the direction perpendicular to the surface of the heat receiving block 2, A plurality of radiating fins 5, 5 ′ (30 in the embodiment shown in FIGS. 1 and 2) are arranged alternately at equal intervals (3 mm intervals) in a direction perpendicular to the surface of the heat receiving block 2. ing. The length of the laminated portion 9 can be appropriately selected according to the required cooling capacity, and is 225 mm in the cooling device 1 according to the first embodiment.

  That is, out of the length 350 mm of the radiating fin 5 of the leeward side radiating fin group portion 7 and the length 350 mm of the radiating fin 5 ′ of the leeward side radiating fin group portion 8, the leeward side 225 mm of the leeward side radiating fin group portion 7 and the leeward side. A laminated portion 9 of the radiating fin group 6 is formed from the windward side 225 mm of the side radiating fin group portion 8. Therefore, in the radiating fin group 6 of the cooling device 1, among the leeward radiating fin group portion 7, the portion other than the leeward side portion constituting the laminated portion 9, that is, the windward portion not constituting the laminated portion 9 is Of the leeward side radiating fin group portion 8, the portion other than the windward side portion constituting the laminated portion 9, that is, the leeward portion not constituting the laminated portion 9 is also 125 mm.

  Moreover, although the dimension of the heat receiving block 2 can be selected suitably, in the cooling device 1, it is width 500mm, length 1000mm, and thickness 25mm. Although the dimensions of the heat pipe 3 can also be selected as appropriate, in the cooling device 1, the dimensions of the U-shaped heat pipe 3-1 in side view and the dimensions of the L-shaped heat pipe 3-2 in side view are both pipes. The diameter is 15.88 mm, and the dimension in the width direction of the U-shaped or L-shaped portion in side view is 106 mm. The side view U-shaped heat pipe 3-1 and the side view L-shaped heat pipe 3-2 both have a circular cross-sectional shape.

  In the cooling device 1 according to the first embodiment, the cooling air is supplied in the direction of the arrows in FIGS. Therefore, the direction of the flow 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 is parallel or substantially parallel to the surface of the radiating fins 5, 5 ′. The cooling device 1 is installed so as to flow. Accordingly, the cooling air can smoothly pass through the gaps between the heat radiation fins 5 and 5 ', and thus heat can be efficiently taken from the heat radiation fins 5 and 5'.

  Next, the case where the heat generating elements having a plurality of heat generation amounts are mounted on the cooling device 1 according to the first embodiment will be described with reference to FIG. As an example, a total of six heating elements 100 are mounted on each of the upstream side portion and the leeward side portion of the cooling block of the heat receiving block 2 in a direction orthogonal to the flow direction of the cooling air. explain.

  The heat released from each heating element 100 is transmitted to the heat receiving block 2 that is thermally connected to each heating element 100. The heat transmitted to the heat receiving block 2 is transmitted to a heating unit corresponding to the bottom of the heat pipe 3 thermally connected to the heat receiving block 2. Then, the heat transport system of the heat pipe 3 is activated, and the heat absorbed by the heating part of the heat pipe 3 receives the flow of the cooling air through the cooling part of the heat pipe 3 extending from the heating part. The heat radiation fins 5 and 5 'thermally connected to the heat pipe 3 are transmitted to the outside of the cooling device 1 from the heat radiation fins 5 and 5'.

  Thus, in the cooling device 1 according to the first embodiment, three rows of the heating elements 100 arranged in the direction orthogonal to the flow direction of the cooling air are arranged in a direction parallel to the flow direction of the cooling air. When two rows are mounted, the rising temperature of the heating element 100-1 mounted on the leeward side is 35.6 ° C, and the rising temperature of the heating element 100-2 mounted on the leeward side is 35.2 ° C, The temperature difference between the heating element 100-1 and the heating element 100-2 was 0.4 ° C.

  On the other hand, as shown in FIG. 6B and FIG. 7, the conventional example 1 has a width of 500 mm × long instead of the radiating fin group 6 for comparison with the cooling device 1 according to the first embodiment. 30 radiating fins 45 having a thickness of 500 mm and a thickness of 0.5 mm are attached at the same interval as the laminating portion 9 of the cooling device 1 to form the radiating fin group 46 in the same manner as the laminating portion 9. Are replaced with a U-shaped heat pipe 43 in a side view, that is, the configuration is the same as that of the cooling device 1 except that 59 U-shaped heat pipes 43 are installed in a side view. Furthermore, the same heat generating element 400 as the cooling device 1 was mounted on the heat receiving block 42 in the same arrangement relationship.

  In Conventional Example 1, the rising temperature of the heating element 400-1 mounted on the leeward side is 31.0 ° C., and the rising temperature of the heating element 400-2 mounted on the leeward side is 39.0 ° C. -1 and the heating element 400-2 had a rising temperature difference of 8.0 ° C. This is because in the conventional example 1, the pressure of the cooling air is greatly lost by the heat radiating fins 45, so that the leeward heating element 400-2 is less likely to be cooled than the leeward heating element 400-1.

  Further, for the cooling device 41 ′ of the conventional example 2, as shown in FIGS. 8 and 9, the heat generating block 42 has the same heating element as the conventional example 1 for comparison with the cooling device 1 according to the first embodiment. 400 was mounted in the same arrangement relationship. Regarding the cooling device 41 ′ of the second conventional example, instead of the radiating fin group 6, the radiating fins 45 having a width of 500 mm × a length of 350 mm × a thickness of 0.5 mm are arranged at the same interval as the stacked portion 9 of the cooling device 1. The radiating fins 46 are formed by attaching the sheets, and among the heat pipes composed of three U-shaped heat pipes in the side view, the U-shaped heat pipes in the side view on the uppermost side of the cooling air are respectively L-shaped in the side view. The side view U located on the most leeward side of the heat pipe group in which one side view L-shaped heat pipe is arranged on the leeward side in addition to the three side view U-shaped heat pipes. The cooling device 1 except that the L-shaped heat pipes are replaced with L-shaped heat pipes 43 'in side view, that is, 34 U-shaped heat pipes 43 in side view and 25 L-shaped heat pipes in side view are used. It was set as the same structure.

  In Conventional Example 2, the rising temperature of the heating element 400-1 mounted on the leeward side is 37.0 ° C., and the rising temperature of the heating element 400-2 mounted on the leeward side is 33.0 ° C. -1 and the heating element 400-2 had a rising temperature difference of 4.0 ° C. In Conventional Example 2, since the length of the heat dissipating fins is short, it is necessary to replace the U-shaped heat pipe 43 on the windward side view with the L-shaped heat pipe 43 'on the windward side. This is because the cooling capacity for the heating element 400-1 is reduced.

  As described above, in the cooling device 1 according to the embodiment of the present invention, the temperature difference between the heating element mounted on the windward side and the heating element mounted on the leeward side is higher than that in the conventional examples 1 and 2. It was greatly reduced. In the laminated portion 9 where the radiating fin pitch is relatively smaller than the radiating fin pitch on the windward side, the radiating fins 5, 5 ′ serve as resistance to the flow of the cooling air. However, since the windward portion has a heat radiation fin pitch that is relatively larger than the heat radiation fin pitch of the laminated portion 9, the cooling air easily escapes the laminated portion 9, and suppresses the loss of cooling air pressure in the laminated portion 9. be able to. Therefore, it is considered that the temperature rise of the heating element mounted on the leeward side can be further suppressed.

  Next, the cooling device 21 according to the second embodiment of the present invention will be described with reference to FIGS. In the cooling device 1 of the first embodiment, the radiating fin group 6 includes the leeward side portion of the radiating fin 5 of the leeward side radiating fin group portion 7 and the windward side portion of the radiating fin 5 ′ of the leeward side radiating fin group portion 8. Are alternately arranged in the vertical direction with respect to the surface of the heat receiving block 22 to form the laminated portions 9, so that the windward side portion of the windward radiating fin group portion 7 and the leeward side radiating fin group portion 8 The leeward side portion, the laminated portion 9 that is an intermediate portion of each of the above portions, and the three portions were provided, but instead of this, as shown in FIGS. It is good also as the cooling device 21 provided as a body radiation fin group.

  The cooling device 21 includes a plurality of radiating fin groups 26 in which the radiating fins 25 are arranged at equal intervals, that is, a plurality of radiating fin groups 26 provided with a plurality of radiating fins 25 at an equal pitch in a direction parallel to the flow direction of the cooling air (3 in the figure). Are arranged in a column. The heat radiating fins 25 are rectangular thin plates. The radiating fins 25 are attached such that the surfaces thereof are parallel or substantially parallel to the cooling air flow direction. Further, the surface of the heat radiating fin 25 is parallel to or substantially parallel to the surface of the heat receiving block 22. In the cooling device 21 as well, as in the cooling device 1 described above, each radiation fin 25 is attached to the heat pipe 23, that is, the U-shaped heat pipe 23-1 in side view and the L-shaped heat pipe 23-2 in side view. Yes. Further, the heat receiving elements 22 corresponding to the side where the heat pipes 23 and the heat radiating fins 25 are not attached are mounted on the back surface by mounting the heat generating elements 200-1 and 200-2 which are the objects to be cooled. It becomes possible.

  Of the three radiating fin groups 26 to which the plurality of radiating fins 25 are attached, the shapes and dimensions of the first radiating fins 25-1 that are constituent elements of the first radiating fin group 26-1 are the same as each other. The side surface portion of the first radiation fin group 26-1 is in a state where the edge portions of the first radiation fins 25-1 are aligned. Of the three radiating fin groups 26 to which the plurality of radiating fins 25 are attached, the shape and dimensions of the second radiating fins 25-2, which are components of the second radiating fin group 26-2, are the same as each other. The side surface portion of the second radiation fin group 26-2 is in a state where the edge portions of the second radiation fins 25-2 are aligned. Of the three radiating fin groups 26 to which the plurality of radiating fins 25 are attached, the shapes and dimensions of the third radiating fins 25-3, which are constituent elements of the third radiating fin group 26-3, are the same as each other. The side surface portion of the third radiation fin group 26-3 is in a state where the edge portions of the third radiation fins 25-2 are aligned. Moreover, since each radiation fin group 26, that is, the first radiation fin group 26-1, the second radiation fin group 26-2, and the third radiation fin group 26-3 are separate from each other, the first radiation fin group 26- 1 and the second radiation fin group 26-2, and between the second radiation fin group 26-2 and the third radiation fin group 26-3, there are gaps in the direction perpendicular to the surface of the heat receiving block 22, respectively. Is formed.

  In the first radiating fin group 26-1, which is arranged on the most upstream side of the cooling air, a predetermined number of first radiating fins 25-1 are provided at a predetermined equal interval t (in FIG. (15 sheets, which is the same as the number of the radiation fins 5 of the radiation fin group portion 7). In the cooling device 21, the pitch of the first radiating fins 25-1 corresponds to the pitch of the radiating fins 5 of the windward radiating fin group portion 7 of the cooling device 1. Although the length of the 1st radiation fin 25-1 can be selected suitably, in the cooling device 21, it is the length of the windward side part of the windward radiation fin group part 7. FIG.

  In the second radiating fin group 26-2 disposed adjacent to the leeward side of the first radiating fin group 26-1, the second radiating fins 25-2 are arranged at equal intervals t ′ that are narrower than the interval t. A predetermined number greater than the number of the heat radiating fin groups 26-1 (in FIG. 5, 30 pieces that are the same as the number of the heat radiating fins 5 and 5 'of the stacked unit 9 of the cooling device 1) is attached. In the cooling device 21, the pitch of the second radiating fins 25-2 corresponds to the pitch of the radiating fins 5, 5 ′ of the stacked portion 9. Although the length of the 2nd radiation fin 25-2 can be selected suitably, in cooling device 21, it is the length of lamination part 9.

  In the third radiating fin group 26-3 disposed adjacent to the leeward side of the second radiating fin group 26-2, that is, disposed on the most leeward side of the cooling air, the third radiating fin 25-3 is At a predetermined equal interval t, a predetermined number (15 in FIG. 5 which is the same as the number of radiating fins 5 'of the leeward side radiating fin group portion 8 of the cooling device 1) is attached. In the cooling device 21, the pitch of the third radiating fins 25-3 corresponds to the pitch of the radiating fins 5 ′ of the leeward side radiating fin group portion 8. Although the length of the 3rd radiation fin 25-3 can be selected suitably, in the cooling device 21, it is the length of the leeward side site | part of the leeward side radiation fin group part 8. FIG.

  In the cooling device 21, the pitch of the first radiation fins 25-1 of the first radiation fin group 26-1 is the same as the pitch of the third radiation fins 25-3 of the third radiation fin group 26-3, and the second It is larger than the pitch of the 2nd radiation fin 25-2 of the radiation fin group 26-2. Moreover, in the cooling device 21, the pitch of the radiation fins 25-2 of the second radiation fin group 26-2 is an integer multiple of the pitch of the first radiation fin group 26-1 and the third radiation fin group 26-3 ( In FIG. 5, the relationship is doubled, and therefore, the interval t ′ = 0.5 t).

  Further, the second radiating fin group 26-2 has the same pitch phase of the radiating fins as the first radiating fin group 26-1 and the third radiating fin group 26-3. That is, the predetermined 2nd radiation fin 25-2 is arrange | positioned among the 2nd radiation fin groups 26-2 on the same plane of each 1st radiation fin 25-1. On the other hand, the first radiating fins 25-1 of the first radiating fin group 26-1 and the third radiating fins 25-3 of the third radiating fin group 26-3 are perpendicular to the surface of the heat receiving block 22. They are attached in a positional relationship shifted in the direction by a half width (0.5 t) of the interval t. Therefore, the second radiation fin 25-2 that is not on the same plane as the first radiation fin 25-1 is disposed on the same plane as the third radiation fin 25-3.

  Also in the cooling device 21 according to the second embodiment, in the second radiation fin group 26-2, the pitch of the second radiation fins 25-2 is relatively smaller than the pitch of the first radiation fins 25-1. The fins 25-2 provide resistance to the cooling air flow. However, since the third radiating fin group 26-3 has a radiating fin pitch relatively larger than the radiating fin pitch of the second radiating fin group 26-2, the cooling air flows in the second radiating fin group 26-2. It is easy to come off, and the loss of the cooling air pressure in the second radiating fin group 26-2 can be suppressed. Therefore, it is thought that it can suppress that the pressure of a cooling wind and a wind force fall in the site | part of the 3rd radiation fin group 26-3. As a result, it is considered that the temperature rise of the heating element mounted on the leeward side can be further suppressed.

  Next, an example of a method for manufacturing the cooling device of the present invention will be described. Here, the cooling device 1 of Embodiment 1 will be described as an example. On the surface of the heat receiving block 2, recesses are respectively formed at locations corresponding to the attachment positions of the U-shaped heat pipe 3-1 in side view and the L-shaped heat pipe 3-2 in side view. The recess has a size and shape that can be fitted to the bottom of the U-shaped heat pipe 3-1 in side view or the L-shaped heat pipe 3-2 in side view.

  First, by fitting the bottom of the U-shaped heat pipe 3-1 in side view or the L-shaped heat pipe 3-2 in side view into the respective recesses on the surface of the heat receiving block 2, the vertical direction with respect to the surface of the heat receiving block 2 A plurality of side-view U-shaped heat pipes 3-1 and side-view L-shaped heat pipes 3-2 (hereinafter referred to as heat pipes 3) are erected and fixed. As a result, the bottom surface of the heat pipe 3 and the heat receiving block 2 come into contact with each other, and the heat pipe 3 and the heat receiving block 2 are thermally connected. Each of the radiating fins 5 and 5 'is provided with a hole having a shape corresponding to the cross-sectional shape of the pipe of the heat pipe 3 at a predetermined position corresponding to the dimension of the heat pipe 3 and the arrangement thereof. After the heat pipes 3 are erected and fixed in all the recesses, the fixed heat pipes 3 are fitted into the holes of the heat radiation fins 5, 5 ′, and the heat radiation fins 5, 5 ′ are attached to the heat pipes 3. At this time, the radiating fins 5 constituting the leeward radiating fin group portion 7 and the radiating fins 5 ′ constituting the leeward side radiating fin group portion 8 are alternately attached to form the laminated portion 9. The heat pipe 3 and the heat radiating fins 5, 5 ′ are thermally connected by the surface of the heat pipe 3 coming into contact with the inner wall surfaces of the holes of the heat radiating fins 5, 5 ′. Thus, the cooling device of this invention is manufactured by installing a heat pipe in a heat receiving block and attaching a radiation fin to the installed heat pipe.

  Next, the usage method of the cooling device of this invention is demonstrated. Here, a description will be given by taking, as an example, a usage method in which the cooling devices 1 and 21 according to the above-described embodiment of the present invention cool an electric 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 heat generating elements) are brought into contact with the back surfaces of the heat receiving blocks 2 and 22 of the cooling devices 1 and 21 and thermally connected to the heat receiving blocks 2 and 22. A fan for supplying cooling air to the cooling devices 1 and 21 is installed in the housing in which the heating elements are stored. At this time, the fan and the cooling devices 1 and 21 are installed so that the flow direction of the cooling air blown from the fan is parallel to the surfaces of the heat receiving blocks 2 and 22. In the cooling device of the present invention, particularly when the heating element stored in the casing is cooled, the cooling air can be efficiently merged at the leeward side portion of the cooling device, so that the heating element is reliably cooled uniformly. Can be

  Next, other embodiments of the present invention will be described. In each of the above embodiments, the radiating fin pitches of the laminated portion and the second radiating fin group are equally spaced, and the radiating fins are spaced at intervals smaller than the leeward radiating fin pitch and the leeward radiating fin pitch. However, instead of this, a part of the radiating fin pitch of the laminated portion and the second radiating fin group may be enlarged. That is, about a part of lamination | stacking part and a part of 2nd radiation fin group, you may make the space | interval of a radiation fin larger than the other site | part of a lamination | stacking part, and the other site | part of a 2nd radiation fin group. At this time, the space | interval of the enlarged radiation fin is good also as the space | interval of the radiant fin of the windward side, and the space | interval of the radiant fin of the leeward side. Thereby, the flow of the cooling air in the laminated portion and the second radiating fin group becomes smoother, and the temperature difference between the heating elements can be made more uniform.

  For example, among the plurality of radiating fins 5 of the windward radiating fin group portion 7, a plurality of second radiating fins 25 of the second radiating fin group 26-2 are provided for a portion corresponding to the laminated portion 9 of some of the radiating fins 5. -2, among some of the second radiating fins 25, cut into a concave shape in plan view, a convex shape or a repetitive shape of concave and convex, respectively, and arranged so that the concave portion and the convex portion face the leeward side of the cooling air, The space | interval of the one part of the laminated part 9 and the radiation fin of the 2nd radiation fin group 26-2 can be enlarged. In the case of the cooling device 21, by not attaching a part of the second radiating fin 26-2 to the heat pipe 23, a part of the radiating fin pitch can be widened.

  In each of the above embodiments, the radiating fin pitch at the leeward side and the radiating fin pitch at the leeward side are the same, but instead, the radiating fin pitch between the above parts is made different. Also good.

  In each of the above embodiments, the heat pipe group is provided in a plurality of rows in a direction orthogonal to the flow direction of the cooling air, and the heat pipe group is alternately shifted in a specific direction in a direction parallel to the flow direction of the cooling air. However, the arrangement relationship of the heat pipes is not limited to this, and can be selected as appropriate. For example, instead of the arrangement relationship, the heat pipe group may be arranged in a plurality of rows in a state where the 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 each of the above embodiments, a heat pipe is used as the heat conductive member. Instead, a metal having excellent heat conductivity, for example, a heat conductivity at 25 ° C. is 100 W / (m · K) or more. Some aluminum, copper, or the like may be used. Moreover, in each said embodiment, although the radiation fin was arrange | positioned at equal intervals in the radiation fin group, you may provide a change suitably in the space | interval of a radiation fin.

  Even if a heating element is mounted on the leeward side and the leeward side of the cooling air, the heating element mounted on the leeward side can be reliably cooled, and the temperature between each heating element is made uniform, The utility value is high in the field of a cooling device that cools various types of heating elements, for example, a cooling device that cools a large number of heating elements mounted on a railway vehicle by forced air cooling.

1, 21 Cooling device 2, 22 Heat receiving block 3, 23 Heat pipe 5, 5 ', 25 Radiation fin 6, 26 Radiation fin group 7 Windward radiation fin group 8 Windward radiation fin group 9 Laminating part 26-1 1 radiation fin group 26-2 2nd radiation fin group 26-3 3rd radiation fin group

Claims (6)

A heat receiving block that can be thermally connected to the heat generating element, a side view U-shaped heat pipe whose bottom is thermally connected to the heat receiving block, and a heat radiating fin thermally connected to the side view U-shaped heat pipe A cooling device in which a flow of cooling air is set in a direction parallel to the surface of the heat receiving block,
In the radiating fin group, the intermediate part between the leeward side portion and the leeward side portion of the cooling air includes the radiating fin pitch of the leeward portion of the cooling air and the radiating fin of the leeward portion of the cooling air. A cooling device comprising a radiating fin pitch smaller than the pitch, wherein a surface of the radiating fin is parallel to a flow direction of the cooling air.   2. The cooling device according to claim 1, wherein a radiating fin pitch of the leeward side portion and a radiating fin pitch of the leeward side portion are the same.   3. The cooling device according to claim 1, wherein a radiating fin pitch of the leeward portion and a radiating fin pitch of the leeward portion are an integral multiple of the radiating fin pitch of the intermediate portion. A heat receiving block that can be thermally connected to the heat generating element, a side view U-shaped heat pipe whose bottom is thermally connected to the heat receiving block, and a heat radiating fin thermally connected to the side view U-shaped heat pipe A cooling device in which a flow of cooling air is set in a direction parallel to the surface of the heat receiving block,
A plurality of the radiating fin groups are arranged in tandem along the flow direction of the cooling air, and among the plurality of radiating fin groups, a radiating fin group is arranged at an intermediate portion between the upwind side and the leeward side of the cooling air. A surface of the radiation fin, the radiation fin pitch of the radiation fin group disposed on the windward side of the cooling air and the radiation fin pitch smaller than the radiation fin pitch of the radiation fin group disposed on the leeward side of the cooling air Is a direction parallel to the flow direction of the cooling air.   The cooling device according to claim 4, wherein a radiating fin pitch of the radiating fin group disposed on the leeward side and a radiating fin pitch of the radiating fin group disposed on the leeward side are the same.   The radiating fin pitch of the radiating fin group arranged on the leeward side and the radiating fin pitch of the radiating fin group arranged on the leeward side are integer multiples of the radiating fin pitch of the radiating fin group arranged on the intermediate portion. The cooling device according to claim 4 or 5, wherein

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