JP2016136574A - Cooler and lamination unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for enhancing cooling efficiency without damaging assembling performance in a cooler for cooling an electronic component.SOLUTION: A cooler includes a cooler body 2, a metal plate 3 and an elastic plate 6. The cooler body 2 is disposed opposing to a power card 4, and has a refrigerant flow passage formed inside and an opening that is formed on a surface opposing to an electronic component and leads to the flow passage. One surface of the metal plate 3 comes into contact with the power card 4, and the other surface closes the opening and has fins 3a. The elastic plate 6 is disposed on a bottom surface constituting the bottom of the flow passage, and has a plurality of projections 6a on the surface opposing to the metal plate 3. A tip of the projection 6a abuts on a tip of the fin 3a.SELECTED DRAWING: Figure 1

Description

  The technology disclosed in the present specification relates to a cooler and a stacked unit in which an electronic component and a cooler are stacked.

  Electronic components such as semiconductor elements and CPU generally generate heat. A cooler may be provided to cool the heat generating electronic components. Such a cooler is disclosed in Patent Document 1, for example. The cooler disclosed in Patent Document 1 includes a cooler body provided with a flow path (referred to as a recess in Cited Document 1) through which a liquid refrigerant passes, and a metal plate that closes the opening of the recess. Fins are provided on the surface of the metal plate facing the recess. The heat of the electronic component transmitted from the electronic component to the metal plate is transmitted to the fin, and is transmitted from the fin to the liquid refrigerant.

JP 2014-053649 A

  In the cooler shown in Patent Document 1, the liquid refrigerant flows while contacting the side surfaces of the fins, so that the heat from the electronic component is efficiently transmitted to the liquid refrigerant. On the other hand, when assembling the cooler shown in Patent Document 1, it is necessary to consider assembly tolerances. Therefore, a gap is provided between the bottom surface of the recess and the tip surface of the fin. Liquid refrigerant also flows through this gap. There is a possibility that the flow rate of the liquid refrigerant flowing through the side surfaces of the fins is reduced by the amount of the liquid refrigerant flowing through the gap, and the cooling efficiency of the cooler is impaired.

  As a measure for reducing the flow rate of the liquid refrigerant flowing in the gap, it is conceivable to arrange an elastic member in the gap. The above-mentioned gap is narrowed by the elastic member, and the elastic member is elastically deformed by being sandwiched between the bottom surface of the recess and the tip surface of the fin according to the assembly tolerance. However, when such an elastic member is disposed, a reaction force acts on the fin from the elastic member at the time of assembly, and the assemblability of the metal plate to the cooler body may be deteriorated. In the present specification, a technique is provided that includes an elastic member in order to narrow the gap between the bottom surface of the recess and the tip end surface of the fin, and suppresses a reaction force acting from the elastic member during assembly.

  In general, when the same elastic member is compressed by the same length, the smaller the area of the contact surface between the member that compresses the elastic member and the elastic member, the smaller the force that compresses the elastic member. That is, if the length compressed according to the assembly tolerance is the same, the smaller the contact area of the elastic member that contacts the tip of the fin, the smaller the reaction force that acts on the fin (ie, metal plate) from the elastic member. Can be small.

  The cooler disclosed in the present specification is a cooler that cools an electronic component. The cooler includes a cooler body, a metal plate, and an elastic plate. The cooler body is disposed so as to face the electronic component, and the coolant channel is provided therein, and an opening leading to the channel is provided on the surface facing the electronic component. One surface of the metal plate is in contact with the electronic component, the other surface blocks the opening, and a fin is provided on the other surface. The elastic plate is disposed on the bottom surface of the flow path, and a plurality of protrusions are provided on the surface facing the metal plate, and the tips of the protrusions are in contact with the tips of the fins.

  According to such a configuration, the tips of the plurality of protrusions are in contact with the tips of the fins. When there are no plurality of protrusions, the entire tip surface of the fin comes into contact with the elastic plate. On the other hand, due to the presence of the plurality of protrusions, there are places on the tip surface of the fin that do not contact the protrusions and do not contact each other. That is, the contact area of the elastic plate that contacts the front end surface of the fin can be reduced. Therefore, the reaction force that acts on the fin (that is, the metal plate) from the protrusion can be reduced. Furthermore, since the elastic plate can narrow the gap between the bottom surface of the channel groove and the tip end surface of the fin, the flow rate of the liquid refrigerant flowing through the gap can be reduced.

  In addition, the present specification also discloses a novel laminated unit in which the above-described cooler technology is developed. The stacked unit disclosed in the present application includes a plurality of power cards each housing a semiconductor element, and a plurality of coolers that are stacked with a plurality of power cards, each of which is in contact with each of the plurality of power cards. I have. Each of the plurality of coolers includes a cooler body, two metal plates, and an elastic plate. The cooler main body is provided with a flow path for the refrigerant inside, and is provided on both surfaces in the stacking direction so that openings leading to the flow path face each other. The two metal plates block each of the openings provided on both surfaces in the stacking direction, and fins are provided on one surface located on the opening side, opposite to the one surface. The power card is in contact with the other surface located on the side. The elastic plate is disposed between the fin provided on one of the two metal plates and the fin provided on the other, and a plurality of protrusions are provided on at least one surface facing the metal plate. The tip of the protrusion is in contact with the tip of the fin. Even in this laminated unit, the same effect as the above cooler can be obtained.

  According to the technology disclosed in the present specification, in the cooler and the stacked unit, it is possible to improve the cooling efficiency while suppressing deterioration in assembling property. Details and further improvements of the technology disclosed in this specification will be described in the following “DETAILED DESCRIPTION”.

It is front sectional drawing of the cooler of 1st Example. It is side surface sectional drawing in the II-II line | wire of FIG. It is a top view of the elastic board of 1st Example. It is a side view of the elastic board of 1st Example. It is a fragmentary perspective view of the elastic board of 1st Example. It is front sectional drawing of the cooler of 2nd Example. It is a top view of the elastic board of 2nd Example. It is a fragmentary perspective view of the elastic board of 2nd Example. It is side surface sectional drawing of the cooler of 3rd Example. It is a perspective view of the lamination | stacking unit of 4th Example. It is a disassembled perspective view of the cooler with which a lamination unit is equipped. It is sectional drawing in the assembly state in the XII-XII line | wire of FIG.

(First embodiment)
The cooler of the first embodiment will be described with reference to the drawings. FIG. 1 is a front sectional view of the cooler 100 of the first embodiment. FIG. 2 is a side sectional view taken along the line II-II in FIG. 1 and 2 and FIGS. 3 to 9 described later show a common XYZ coordinate system, and the configuration will be described below using the XYZ coordinate system as appropriate. The cooler 100 is a cooler for cooling the power card 4. The power card 4 is a device in which the semiconductor element 4b is molded with resin. Here, the resin covering the semiconductor element 4b is referred to as a resin mold body 4a. The cooler 100 includes a cooler body 2, a metal plate 3, and an elastic plate 6. The cooler body 2 is provided with a recess 2 a through which the refrigerant passes, an inlet 13 and an outlet 14. The inflow port 13 and the outflow port 14 are disposed so as to face each other, and the recess 2 a communicates with the inflow port 13 and the outflow port 14. The refrigerant flowing in from the inflow port 13 flows into the recess 2a. The refrigerant that has flowed into the recess 2a passes between a plurality of fins 3a described later and flows to the outlet 14. Then, the refrigerant flows out of the cooler 100 from the outlet 14. That is, inside the cooler 100, a flow path constituted by the recess 2a, the inlet 13 and the outlet 14 is provided. As shown in FIG. 2, the refrigerant flows in the Y-axis direction. The refrigerant is, for example, water or LLC (abbreviation of long-life coolant).

  The metal plate 3 is arrange | positioned on the cooler main body 2 so that the opening of the hollow 2a may be plugged up. The power card 4 to be cooled is disposed on the surface (that is, the upper surface) opposite to the side where the recess 2a of the metal plate 3 is located. An insulating plate 8 is disposed between the power card 4 and the metal plate 3 to ensure insulation. Between the insulating plate 8 and the metal plate 3, grease 7 having high heat conductivity is applied. On the other hand, a plurality of fins 3a are provided on the surface (that is, the lower surface) on the side where the recess 2a of the metal plate 3 is located. Each fin of the plurality of fins 3a is a flat plate and has the same shape. It should be noted that in FIG. 1, a plurality of fins 3 a are shown by attaching a reference numeral 3 a to one of the plurality of fins. The plurality of fins 3a are arranged in parallel so that the side surfaces thereof face each other. As shown in FIG. 1, the plurality of fins 3 a are arranged in the X-axis direction at equal intervals with an interval L <b> 1. As shown in FIG. 2, the plurality of fins 3 a are arranged such that the side surface with the largest area is parallel to the direction in which the refrigerant flows (that is, the Y-axis direction). In this specification, for the sake of convenience, the configuration will be described assuming that the positive direction of the Z-axis is “upper” and the negative direction of the Z-axis is “lower”.

  Considering assembly tolerance when assembling the cooler 100, a gap is provided between the tips of the fins 3a and the bottom surfaces of the recesses 2a. An elastic plate 6 to be described later is disposed between the tips of the plurality of fins 3a and the bottom surfaces of the recesses 2a so as to fill this gap.

  The elastic plate 6 is a plate made of an elastic body such as rubber. The elastic plate 6 is disposed so as to cover the entire bottom surface of the recess 2a. As shown in the drawing, a plurality of protrusions 6 a are provided on the upper surface of the elastic plate 6, that is, the surface facing the metal plate 3. As shown in FIG. 1, each of the protrusions included in a line in the X-axis direction of the plurality of protrusions 6a is disposed so as to face each of the plurality of fins 3a. The tips of the projections included in a row in the X-axis direction of the plurality of projections 6a are in contact with the tips of the plurality of fins 3a. The detailed structure of the plurality of protrusions 6a will be described later.

  The cooler 100 includes a holding plate 5 on the power card 4 for pressing the power card 4 against the metal plate 3. The holding plate 5 is fastened to the cooler body 2 by bolts 9, and the power card 4 is pressed against the metal plate 3 by the fastening force of the bolts 9. With this fastening force, the grease 7 is thinly stretched, and the power card 4 and the insulating plate 8 and the insulating plate 8 and the metal plate 3 are in close contact with each other. The heat transfer between the power card 4 and the metal plate 3 is enhanced by the close contact between the power card 4 and the insulating plate 8 and between the insulating plate 8 and the metal plate 3. Further, due to the fastening force of the bolt 9, the plurality of protrusions 6a of the elastic plate 6 abut against the plurality of fins 3a and are pressed downward by the plurality of fins 3a to be compressed and deformed. A gasket 12 is provided between the metal plate 3 and the upper surface of the cooler body 2. The gasket 12 is also pressed by the fastening force of the bolt 9, and the gap between the metal plate 3 and the upper surface of the cooler body 2 is sealed by the pressed gasket 12.

  The elastic plate 6 will be described with reference to FIGS. FIG. 3 is a plan view of the elastic plate 6. FIG. 4 is a side view of the elastic plate 6. FIG. 5 is a partial perspective view of the elastic plate 6. As shown in FIGS. 3 to 5, a plurality of protrusions 6 a are provided on the upper surface of the elastic plate 6 (that is, the surface facing the metal plate 3). As is well represented in FIGS. 4 and 5, each of the plurality of protrusions 6a has a regular quadrangular pyramid shape. The plurality of protrusions 6a all have the same shape. As shown well in FIG. 3, when viewed from above (that is, the Z-axis direction), the plurality of protrusions 6a are arranged at equal intervals vertically and horizontally. The plurality of protrusions 6a are arranged so that even-numbered protrusions and odd-numbered protrusions are shifted by a half pitch when viewed from either the vertical direction or the horizontal direction (that is, either the X-axis direction or the Y-axis direction) Are two-dimensionally arranged. In other words, when the plurality of protrusions 6a are viewed from either the vertical direction or the horizontal direction, one protrusion included in the next row of the one row is between adjacent protrusions in one row. positioned. In FIG. 4, when viewed from the Y-axis direction, adjacent protrusions included in one row are arranged at equal intervals at an interval L2. The distance L2 between the protrusions is the same as the distance L1 between the plurality of fins 3a. As described above, each of the protrusions included in a row in the Y-axis direction of the plurality of protrusions 6a is arranged to face the plurality of fins 3a. Even when viewed from the X-axis direction, adjacent protrusions included in one row are arranged at equal intervals at an interval L2.

  Further, as described above, the plurality of protrusions 6a are arranged such that the even-numbered protrusions and the odd-numbered protrusions are shifted by a half pitch. Therefore, when the odd rows of protrusions are arranged to face the plurality of fins 3a, the even rows of protrusions are arranged between the plurality of fins 3a (see FIG. 1). That is, in the plurality of protrusions 6a, there are protrusions that do not contact any of the plurality of fins 3a.

  Further, the height H of the plurality of protrusions 6a is designed according to the assembly tolerance described above. Specifically, the height H is designed with a margin so that the tip of the fin does not reach the base of the protrusion when the assembly tolerance is maximized. Thereby, even when the assembly tolerance is maximum, the entire front end surface of the fin does not contact the elastic plate 6.

  In the cooler 100 including the plurality of fins 3a in the refrigerant flow path, the refrigerant flows while contacting the side surfaces of the plurality of fins 3a, whereby heat from the power card 4 is efficiently transmitted to the refrigerant. That is, the cooling efficiency of the cooler 100 increases as the flow rate of the refrigerant flowing between the plurality of fins 3a increases. According to the above-described configuration, the elastic plate 6 is disposed in the gap between the plurality of fins 3a and the bottom surfaces of the recesses 2a. Since the elastic plate 6 narrows the gaps between the plurality of fins 3a and the bottom surfaces of the recesses 2a, the refrigerant flowing through the gaps is reduced. Therefore, it is suppressed that the flow volume of the refrigerant | coolant which flows between several fins 3a falls, and it is prevented that the cooling efficiency of the cooler 100 is impaired.

  Moreover, according to the above-mentioned structure, it is the front-end | tip of several protrusion 6a that contacts the front-end | tip of several fin 3a. When there is no plurality of protrusions 6a, the entire surface of the tip of the fin comes into contact with the elastic plate 6. However, when there are a plurality of protrusions 6a, the tip of the fin is mixed with a portion that contacts the protrusion and a portion that does not contact. That is, the contact area of the elastic plate 6 that contacts the tip surface of the fin can be reduced. Therefore, the reaction force acting on the plurality of fins 3a (that is, the metal plate 3) from the elastic plate 6 can be reduced. By reducing the reaction force, the gaps between the plurality of fins 3a and the bottom surfaces of the recesses 2a can be narrowed without impairing the assembling property of the cooler 100.

  Further, according to the above-described configuration, the plurality of protrusions 6a have protrusions that do not contact any of the plurality of fins 3a. In the vicinity of such protrusions, the refrigerant flow is disturbed and turbulence is likely to occur. This turbulent flow increases the flow rate of the refrigerant and is expected to improve the cooling efficiency.

(Second embodiment)
With reference to FIGS. 6-8, the cooler 120 of 2nd Example is demonstrated. FIG. 6 is a front sectional view of the cooler 120. The configuration of the cooler 120 other than the elastic plate 26 is the same as that of the cooler 100 of the first embodiment. Below, the elastic board 26 different from 1st Example is demonstrated. As shown in FIG. 6, a plurality of rod-shaped protrusions 26 a are provided on the upper surface of the elastic plate 26. The tips of the plurality of protrusions 26a are in contact with the tips of the plurality of fins 3a. The plurality of protrusions 26 a are deformed so as to be bent by being pushed downward by the plurality of fins 3 a by the fastening force of the bolts 9.

  FIG. 7 is a plan view of the elastic plate 26 of the cooler 120. FIG. 8 is a partial perspective view of the elastic plate 26. As shown in FIGS. 7 to 8, the plurality of protrusions 26 a have a cylindrical shape. As shown in FIG. 7, the plurality of protrusions 26 a are two-dimensionally arranged vertically and horizontally when viewed from the upper direction (that is, the Z-axis direction). The plurality of protrusions 26a are arranged so that even-numbered protrusions and odd-numbered protrusions are shifted by a half pitch when viewed from either the vertical direction or the horizontal direction (that is, either the X-axis direction or the Y-axis direction). Is arranged. In other words, when the plurality of protrusions 26a are viewed from either the vertical direction or the horizontal direction, one protrusion included in the next row of the one row is between adjacent protrusions in one row. positioned. In FIG. 6, the illustration of one protrusion included in the next row visible from between adjacent protrusions in one row is omitted for the sake of easy understanding of the drawing. The interval L3 between the plurality of protrusions 26a in the arrangement direction of the plurality of fins 3a (that is, the X-axis direction) is smaller than the interval L1 between the plurality of fins 3a. Here, a value that is not a divisor of the interval L1 is selected as the interval L3. Thereby, as FIG. 6 shows, the some protrusion 26a contact | abuts with respect to the several fin 3a at random, and the some protrusion 26a deform | transforms. Accordingly, the deformed shapes of the plurality of protrusions 26a are not uniform and have various shapes. In addition, in the plurality of protrusions 26a, the even-numbered protrusions and the odd-numbered protrusions are arranged so as to be shifted by a half pitch, and the interval L3 between the plurality of protrusions 26a is smaller than the interval L1 between the plurality of fins 3a. There are projections that do not come into contact with the tips of the fins 3a.

  It is desirable that the thickness of the plurality of protrusions 26a be sufficiently thin and thread-like compared to the interval L1 between the plurality of fins 3a. 6 to 8, the plurality of protrusions 26a are greatly exaggerated for easy understanding of the structure of the protrusions.

  Even in such a configuration, the same effect as in the first embodiment can be obtained. Furthermore, it is expected that the generation of turbulent flow is further promoted by deforming the plurality of protrusions 26a into various non-uniform shapes.

(Third embodiment)
With reference to FIG. 9, the cooler 130 of 3rd Example is demonstrated. FIG. 9 is a side cross-sectional view of the cooler 130 in the same direction as FIG. 2 of the first embodiment. The cooler 130 is a cooler for cooling the power card 34 in which the three semiconductor elements 34b, 34c, and 34d are covered with the resin molded body 34a. The cooler 130 includes a cooler body 32, a metal plate 33, and an elastic plate 36 as in the first embodiment. An insulating plate 38 and grease 37 are disposed between the metal plate 33 and the power card 34, and a gasket 42 is disposed between the metal plate 33 and the cooler body 32. A recess 32 a is provided on the upper surface of the cooler body 32. The metal plate 33 is arrange | positioned so that the hollow 32a may be covered. On the lower surface of the metal plate 33, that is, the surface on the side where the recess 32a is located, fin groups 33b, 33c, and 33d composed of a plurality of fins are provided in three locations. Each of the fin groups 33b, 33c, and 33d is disposed so as to face the semiconductor elements 34b, 34c, and 34d of the power card 34, respectively. The elastic plate 36 is disposed on the bottom surface of the recess 32a so as to cover the entire bottom surface of the recess 32a. On the upper surface of the elastic plate 36, that is, the surface facing the metal plate 33, projection groups 36 b, 36 c and 36 d composed of a plurality of projections are provided in three locations. Each of the projection groups 36b, 36c, and 36d is disposed to face each of the fin groups 33b, 33c, and 33d. The tips of the projection groups 36b, 36c, and 36d are in contact with the tips of the fin groups 33b, 33c, and 33d. The shape and arrangement of the protrusions of the protrusion groups 36b, 36c, and 36d are the same as the plurality of protrusions 6a of the first embodiment.

  Immediately below each of the semiconductor elements 34b, 34c, and 34d, which are heat generation sources, is a portion where the heat generation amount is high. According to the above-described configuration, the fins can be selectively disposed at a location where the heat generation amount is high. By selectively disposing the fins, the flow resistance can be made smaller than when the fins are disposed on the entire surface, and the cooling efficiency can be improved by suppressing a decrease in the flow rate of the refrigerant.

(Fourth embodiment)
The technology of the cooler disclosed in the present specification can also be applied to a stacked unit in which a plurality of coolers and a plurality of power cards are stacked. With reference to FIGS. 10-12, the laminated unit which employ | adopted the structure of the cooler disclosed by this specification is demonstrated. 10 to 12 show a common XYZ coordinate system, and the configuration will be described below using the XYZ coordinate system as appropriate. The X-axis direction coincides with the stacking direction of the stacking unit.

  FIG. 10 is a perspective view of the laminated unit 200. The laminated unit 200 is a component built in the power converter. The stacking unit 200 is configured by alternately stacking a plurality of coolers 51a-51e and a plurality of power cards 52a-52d. Coolers 51a and 51b are in contact with both sides of the power card 52a. The same applies to other power cards. Regarding the coolers 51a and 51e positioned at both ends of the stacking unit 200 in the stacking direction, the power cards 52a and 52d are in contact with only one surface. A cover 53a having a refrigerant supply pipe 54 and a refrigerant discharge pipe 55 is attached to the surface of the cooler 51a that is not in contact with the power card 52a. A cover 53b is also attached to the surface of the cooler 51e that is not in contact with the power card 52d. The refrigerant supplied from the refrigerant supply pipe 54 provided in the cover 53a is distributed to all the coolers 51a-51e. The refrigerant absorbs heat from the adjacent power cards 52a-52d while passing through the flow paths of the respective coolers 51a-51e. Thereafter, the refrigerant is discharged from a refrigerant discharge pipe 55 provided in the cover 53a.

  The coolers 51a-51e all have the same structure. FIG. 11 shows an exploded perspective view of the cooler 51b as a representative. In FIG. 11, the power cards 52a and 52b located on both sides in the stacking direction (that is, the X-axis direction) of the cooler 51b are drawn with phantom lines. The cooler 51b includes a resin main body (cooler main body 61), an elastic plate 71, a pair of metal plates 81a and 81b, and a pair of gaskets 91a and 91b. A flow path Ps through which the refrigerant flows is formed inside the cooler body 61. The cooler main body 61 is provided with cooler openings 62a and 62b at positions facing the power cards 52a and 52b on both sides. The cooler openings 62a and 62b communicate with the flow path Ps inside the main body.

  The cooler body 61 is horizontally long in the Y-axis direction, and cylindrical portions 61a and 61b are provided at both ends in the Y-axis direction. The cylinder portions 61a and 61b extend in the stacking direction. The cavities inside the cylinder portions 61a and 61b communicate with the flow path Ps. In the laminated unit 200, the cavities inside the cylinder part 61a (61b) communicate with each other between adjacent coolers. The refrigerant supply pipe 54 (see FIG. 4) communicates with a cavity inside the cylinder portion 61a. The refrigerant supplied from the refrigerant supply pipe 54 is distributed to all the coolers 51a to 51e through the cavity inside the cylinder portion 61a. The refrigerant supplied from the cavity inside the cylinder part 61a flows in the Y-axis direction through the flow path Ps and flows into the cavity inside the cylinder part 61b. The cavity inside the cylinder part 61b is connected with the refrigerant | coolant discharge pipe 55 (refer FIG. 4). The refrigerant is discharged from the refrigerant discharge pipe 55. Note that this description is made on the assumption that the flow path Ps is closed by the metal plates 81a and 81b.

  One cooler opening 62a of the cooler body 61 is closed by a metal plate 81a with a gasket 91a interposed therebetween. The other cooler opening 62b is closed by the metal plate 81b with the gasket 91b interposed therebetween. A plurality of fins 82a are provided on the surface of the metal plate 81a facing the flow path Ps (that is, the surface located on the cooler opening 62a side), and the power card 52a is in contact with the opposite surface. . The plurality of fins 82a are arranged in the flow path Ps. The heat of the power card 52a is absorbed by the refrigerant through the metal plate 81a and the fins 82a provided thereon. Similarly to the metal plate 81a, the metal plate 81b is provided with a plurality of fins 82b.

  The elastic plate 71 is disposed inside the flow path Ps. FIG. 12 is a sectional view taken along line XII-XII in FIG. 11 in a state where the cooler 51b is assembled. As shown in FIG. 12, the elastic plate 71 is disposed between the tips of the plurality of fins 82a provided on the metal plate 81a and the tips of the plurality of fins 82b provided on the metal plate 81b. A plurality of projections 71a and 71b similar to the plurality of projections 6a of the first embodiment are provided on both surfaces of the elastic plate 71 in the stacking direction (that is, the X-axis direction). That is, the elastic plate 71 has the same structure as the case where a plurality of protrusions 6a are provided on both upper and lower surfaces of the elastic plate 6 shown in FIGS. Each of the tips of the plurality of protrusions 71a and 71b is in contact with each of the tips of the plurality of fins 82a and 82b. Here, the pitch of the plurality of protrusions 71a and 71b is smaller than the pitch of the plurality of fins 82a and 82b. Among the plurality of protrusions 71a and 71b, there are protrusions that do not come into contact with any of the plurality of fins 82a and 82b.

  According to such a configuration, the gap between the tips of the plurality of fins 82 a and the tips of the plurality of fins 82 b can be narrowed by the elastic plate 71. Therefore, similarly to the first embodiment, the flow rate of the refrigerant passing through the gaps between the tips of the plurality of fins 82a and the tips of the plurality of fins 82b is reduced, and the refrigerant flowing through the side surfaces of the plurality of fins 82a and 82b is reduced. It can suppress that a flow rate falls.

  Moreover, the reaction force which acts on the metal plates 81a and 81b from the elastic plate 71 can be reduced by the plurality of protrusions 71a and 71b of the elastic plate 71 as in the first embodiment. The stacking unit 200 may apply a compressive load in the stacking direction to bring the coolers 51a-51e and the power cards 52a-52d into close contact with each other. When the reaction force by the elastic plate 71 is large, it is necessary to increase the compressive load for compressing the laminated unit 200, and the assemblability of the laminated unit 200 may be reduced. By adopting the elastic plate 71 including the plurality of protrusions 71a and 71b, the reaction force by the elastic plate 71 is suppressed to be small, and the compression load for compressing the laminated unit 200 is also suppressed to be large. By reducing the reaction force, the gaps between the tips of the plurality of fins 82a and the tips of the plurality of fins 82b can be narrowed without impairing the assembling property of the stacked unit 200.

  Further, among the plurality of protrusions 71a and 71b, the presence of protrusions that do not come into contact with any of the plurality of fins 82a and 82b causes generation of turbulent flow as in the first and second embodiments. It can be expected to promote and improve the cooling efficiency.

  Hereinafter, points to be noted regarding the technology shown in the embodiments will be described. The shape of the protrusion provided on the elastic plate is not limited to the shape of the embodiment. For example, the shape may be a polygonal pyramid or a polygonal column. Further, the cooling target of the cooler disclosed in the present specification is not limited to the power card. For example, other electronic components such as a capacitor, a reactor, and a CPU may be cooled.

  In the fourth embodiment, the plurality of protrusions only need to be provided on at least one of both surfaces in the stacking direction of the elastic plate 71.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

2, 32: Cooler body 2a, 32a: Depression 3, 33: Metal plate 3a: Plural fins 4, 34: Power card 4a, 34a: Resin molded bodies 4b, 34b, 34c, 34d: Semiconductor element 5: Holding plate 6, 26, 36: Elastic plates 6a, 26a: Plural projections 7, 37: Grease 8, 38: Insulating plate 9: Bolt 12, 42: Gasket 13: Inlet 14: Outlet 33b, 33c, 33d: Fin group 36b, 36c, 36d: projection group 51a-51e: cooler 52a-52d: power card 54: refrigerant supply pipe 55: refrigerant discharge pipe 61: cooler main body 61a, 61b: cylinder part 62a, 62b: cooler opening 71: Elastic plates 71a, 71b: Plural protrusions 81a, 81b: Metal plates 82a, 82b: Plural fins 91a, 91b: Gaskets 100, 120, 130: Cooler 200: Product Unit

Claims (2)

A cooler for cooling electronic components,
A cooler body that is disposed opposite to the electronic component, provided with a refrigerant flow path therein, and provided with an opening leading to the flow path on a surface facing the electronic component;
One surface is in contact with the electronic component, the other surface closes the opening, and a metal plate provided with fins on the other surface;
An elastic plate disposed on the bottom surface of the flow path, provided with a plurality of protrusions on a surface facing the metal plate, and a tip of the protrusion abutting a tip of the fin;
A cooler characterized by comprising: A plurality of power cards each containing a semiconductor element;
A plurality of coolers stacked with the plurality of power cards, each in contact with each of the plurality of power cards;
With
Each of the plurality of coolers is
A cooler main body provided with a refrigerant flow path therein and openings on both sides in the stacking direction so as to face each other;
Each of the openings provided on both surfaces in the stacking direction is closed, fins are provided on one surface located on the opening side, and the other located on the opposite side of the one surface Two metal plates that are in contact with the power card,
It is arranged between the fin provided on one of the two metal plates and the fin provided on the other, and a plurality of protrusions are provided on at least one surface facing the metal plate. And an elastic plate in which the tip of the protrusion is in contact with the tip of the fin;
A laminated unit comprising:

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