JP2009176871A - Heat sink and electric apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact heat sink having higher cooling performance which can be assembled easily and also provide an electric apparatus including the same heat sink. <P>SOLUTION: The heat sink (10) is mounted to a heating element and cools the heating element. The heat sink includes: a housing 14 forming a first coolant flowing route 36 and a second coolant flowing route 28 adjacent to the first coolant flowing route 36; a separating wall 44 arranged between the first and second coolant flowing routes 36, 38 to separate the first and second coolant flowing routes 36, 38; and a plurality of first fins 40 protruded to the first coolant flowing route 36 and a plurality of second fins 42 protruded to the second coolant flowing route 38, both fins being integrally formed to the housing 14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat sink that dissipates heat generated in an electric device such as a semiconductor device, and an electric device including the heat sink.

  The heat sink is attached to a device having a heating element such as a mechanical device or an electrical device, and takes heat from the device having the heating element to lower the temperature of the heating element and its peripheral components. Therefore, as one form of the heat sink, one in which a refrigerant is circulated inside the housing has been proposed. In such a heat sink, the heat of the heat generating device is radiated to the refrigerant through the housing. In order to promote this heat dissipation, there are some which provide a plurality of fins integrally with the housing inside the housing to substantially increase the contact area between the refrigerant and the housing.

The housing provided with a plurality of fins is preferably integrally molded from the viewpoint of heat transfer efficiency and production efficiency, but it is difficult to densely provide long fins in the housing by extrusion molding. Therefore, for example, Patent Document 1 discloses a first extruding member having a plurality of first fins in a comb shape, a second extruding member having a second fin in a comb shape, a first fin and a first fin. There has been proposed a heat exchanger in which two fins are alternately arranged and combined, and the tips of the first and second fins are press-fitted into a groove formed in the other pushing member and fastened. The heat exchanger described in Patent Document 1 can be applied to a heat sink by using a plurality of spaces formed between adjacent first fins and second fins as refrigerant flow paths.
JP 2002-26207 A

  As described above, the technology related to the heat exchanger described in Patent Document 1 can also be applied to a heat sink, but it takes a lot of time to press fit the tips of all fins into the groove formed in the other pushing member. Therefore, there is a problem that productivity is bad.

  Therefore, the present invention provides a heat sink that is small in size, easy to assemble, and has high cooling performance, and an electric device including the heat sink.

  The present invention is a heat sink that is attached to a heating element and cools the heating element, and a housing that forms a first refrigerant channel and a second refrigerant channel adjacent to the first refrigerant channel; A partition wall disposed between the first and second refrigerant flow paths and separating the first and second refrigerant flow paths; and the first refrigerant flow path formed integrally with the housing. A plurality of first fins projecting and a plurality of second fins projecting into the second refrigerant flow path are provided.

  According to this invention, the heat sink can be assembled by a simple operation of disposing the partition wall between the first and second refrigerant flow paths.

Embodiment 1 FIG.

  The heat sink of Embodiment 1 is demonstrated with reference to FIGS. The illustrated heat sink 10 dissipates heat generated by the heating element 12. Although various devices can be considered as the heating element 12, in the embodiment, for example, a semiconductor device constituting an inverter or a converter is assumed as the heating element.

  The configuration of the heat sink 10 will be specifically described. The heat sink 10 includes a housing 14 made of a material (preferably a metal material) having excellent heat transfer properties. The housing 14 generally has a hollow cylindrical portion 16 and two lids (a first lid 18 and a second lid 20). The cylindrical portion 16 includes an inner space portion 24 extending along the linear center axis 22 and end opening portions (first end opening portion 26 and second end opening portions) located at both ends of the inner space portion 24. Portion 28), and these end openings 26 and 28 are closed by lids 18 and 20, respectively. In the embodiment, the cylindrical portion 16 has a quadrangular outer shape in cross section, but may take any outer cross section. The inner space 24 has a rectangular cross section, but the cross section may take any shape.

  Specifically, in the embodiment, the cylindrical portion 16 has a lower wall 30, an upper wall 32, and left and right side walls 34 that are opposed to each other with the central axis interposed therebetween. The inner space 24 surrounded by these walls has upper and lower refrigerant passages (first refrigerant passage or lower refrigerant passage 36, second refrigerant passage or upper refrigerant passage 38) extending in parallel with the central axis 22. A plurality of heat radiating plates (first fins 40, second fins 42) are disposed in each of the refrigerant passages 36, 38. The fins 40 and 42 are formed integrally with the lower wall 30 and the upper wall 32 of the tubular portion 16 and extend toward the other wall. In the embodiment, each of the fins 40 and 42 extends in parallel with the central axis 22 and continuously from the one end opening 26 over the entire length or almost the entire length of the other end opening 28. . In the embodiment, the fins 40 and 42 are arranged at equal intervals, but the intervals are arbitrary. Moreover, although the thickness of each fin 40,42 is substantially constant, you may make it thick at the base end side (end part near a wall), and thin at the terminal end side.

  The heat sink 10 has a partition wall 44 that separates the refrigerant passages 36 and 38. In the embodiment, the partition wall 44 is inserted into the space formed between the fins 40 and 42 from the first end opening 26 and cannot move substantially vertically by the upper and lower fins 40 and 42. It is supported. The width of the partition wall 44 is preferably substantially equal to the interval between the side walls 34. The thickness of the partition wall 44 is preferably thicker from the viewpoint of manufacturing, and the thinner one is preferable for securing a wide refrigerant passage. Therefore, the thickness of the partition wall 44 may be appropriately determined in consideration of heat transfer between a plurality of refrigerant passages in addition to these elements. As shown in FIG. 2, the length of the partition wall 44 is such that one end 46 of the partition wall 44 is positioned in the first end opening 26 and the other end 48 of the partition wall 44 extends from the second end opening 28. The communication path 50 is adjusted to form a communication path 50 that communicates with the refrigerant paths 36 and 38 between the other end 48 of the partition wall 44 and the second lid 20.

  As described above, in order to stably support the partition wall 44 at the illustrated position by the upper and lower fins 40 and 42, at least a part of the fins 40 and 42 in the region where the partition wall 44 is located has the partition wall 44 formed of the cylindrical portion 16. It is preferable that the ends of the fins 40 and 42 have such a length that they are in contact with the upper surface and the lower surface of the partition wall 40 respectively.

  The cylindrical portion 16 having such a configuration can be processed with high accuracy by extrusion molding. Naturally, it is also possible to divide the cylindrical portion 16 into two parts in the upper and lower directions, separately form the two divided parts by extrusion molding or injection molding, and connect them later with appropriate connecting means.

  As shown in FIGS. 1 and 2, the lids 18 and 20 are made of a plate-like member having a size corresponding to the end face shape of the cylindrical portion 16, and a fixing means such as a bolt after the partition wall 44 is attached to the cylindrical portion 16. To be fixed to the end of the cylindrical portion 16. It is preferable that sealing means such as an annular rubber ring is disposed on the opposed surfaces of the cylindrical portion 16 and the lids 18 and 20 for sealing. The lid 20 is a simple plate, but the lid 18 that closes the first end opening 26 is installed in a refrigerant inflow passage (first refrigerant passage) 52 at a location corresponding to the refrigerant passages 36 and 38 respectively. And a refrigerant outflow passage (second refrigerant passage) 54.

  When the heat sink 10 configured as described above is used, as shown in FIG. 1, the semiconductor device as the heating element 12 is fixed to both the outer surface of the lower wall 30 and the outer surface of the upper wall 32 or one of them. Is done. A refrigerant 56 supplied from a refrigerant supply source (not shown) is supplied to the heat sink 10 through the refrigerant inflow passage 52 to the lower refrigerant passage 36. Usually, a liquid (for example, water) or a gas is used for the refrigerant 56. The lower wall 30 and the fin 40 radiate the heat conducted from the lower heating element 12 to the refrigerant 56 flowing through the lower refrigerant passage 36. Next, the refrigerant 56 moves to the upper refrigerant path 38 via the communication path 50 at the downstream end of the lower refrigerant path 36 and flows in the opposite direction toward the refrigerant outflow path 54. The upper wall 32 and the fin 42 radiate the heat conducted from the heating element 12 attached to the upper wall 32 to the refrigerant 56 flowing through the upper refrigerant passage 38. As described above, the heat sink 10 dissipates the heat conducted from the heating element 12 to the refrigerant 56, thereby cooling the heating element 12.

  As described above, according to the heat sink 10 of the first embodiment, a long refrigerant flow path is formed by folding the flow path in a substantially U shape in one housing 14. Therefore, for example, the flow rate of the refrigerant becomes faster and higher cooling capacity can be obtained than when the refrigerant flows in one direction through two parallel flow paths without being folded. Further, since the heat sink 10 is assembled by a simple operation of inserting the partition wall 44 into the extruded or injection-molded cylindrical portion 16 and attaching the lids 18 and 20, the labor required for manufacturing is remarkably reduced.

  In addition, the refrigerant | coolant 56 before heat absorption has a low temperature compared with the refrigerant | coolant 56 after heat absorption, and has high heat absorption. Therefore, as shown in FIG. 1, when the heating elements 12 are attached to the upper and lower sides of the heat sink 10, a heating element having a large amount of heat generation or a device having low heat resistance is disposed in the vicinity of the lower refrigerant passage 36 through which the cooler refrigerant 56 flows. However, a heating element with a small heat generation amount or a device with high heat resistance may be arranged in the vicinity of the upper refrigerant passage 38 through which the higher-temperature refrigerant 56 flows. In addition, a heating element that should recover a larger amount of heat may be disposed in the vicinity of the lower refrigerant passage 36, and a heating element that should recover a smaller amount of heat may be disposed in the vicinity of the upper refrigerant path 38. Furthermore, in the above description, the refrigerant inflow path 52 is disposed in the lower part, the refrigerant outflow path 54 is disposed in the upper part, and the refrigerant 56 flows from the lower refrigerant path 36 toward the upper refrigerant path 38. The refrigerant 56 may flow from the flow path 38 toward the lower refrigerant flow path 36.

  Which of the refrigerant inflow path 52 and the refrigerant outflow path 54 is arranged above and below may be determined depending on the nature of the refrigerant. For example, when a gas refrigerant is used, the refrigerant inflow path 52 is disposed at the lower part and the refrigerant outflow path 54 is disposed at the upper part. Conversely, when liquid refrigerant is used, the refrigerant inflow path 52 is disposed at the upper part and the refrigerant outflow path 54 is disposed at the lower part. You may arrange. For example, when using a gas refrigerant having a low cooling capacity, in order to efficiently discharge the gas refrigerant that has absorbed heat and has a lighter specific gravity, the gas refrigerant before heat absorption is supplied from the lower refrigerant inflow passage 52, and after the heat absorption, It is preferable to discharge the gaseous refrigerant from the upper refrigerant outlet passage 54.

  The heat sink 10 of the first embodiment described above can be variously modified.

Embodiment 2. FIG.

  In the first embodiment, the communication path 50 that connects the lower refrigerant path 36 and the upper refrigerant path 38 is formed by separating the other end 48 of the partition wall 44 from the second lid 20. The length continuously extends from the end opening 26 to the second end opening 28, and one or a plurality of communication holes (circular or rectangular) are formed in the vicinity of the second end opening 28 of the partition wall 44. Or a long slot along the flow direction), and the refrigerant 56 may flow from the lower refrigerant passage 36 to the upper refrigerant passage 38 through the communication hole. The plurality of communication holes may be arranged uniformly in the width direction of the refrigerant passage or may be arranged unevenly. Further, the communication hole smoothly moves from the lower part to the upper refrigerant passage while the refrigerant 56 flowing between the adjacent fins 40 receives less resistance, so that higher cooling performance can be obtained. It is preferably located between adjacent fins 40 when viewed from a direction parallel to the direction (hereinafter referred to as “the direction of the central axis 22”).

Embodiment 3 FIG.

  As shown in FIG. 4, in the lid 18, in order to disperse the refrigerant 56 supplied from the refrigerant inflow passage 52 as evenly as possible in the lateral direction, the shunt header located upstream of the refrigerant flow path 36 and the fins 40. (Recess) 58 may be formed. In addition, the lid 18 has a merge header (on the downstream side of the refrigerant passage 38 and on the downstream side of the fins 42) in order to efficiently collect the refrigerant 56 from the entire region of the refrigerant passage 38 (the entire region in the width direction) to the refrigerant outflow passage 54. (Recess) 59 may be formed. By adopting such a configuration, the pressure loss of the refrigerant 56 is reduced, the flow rate of the refrigerant 56 is increased when the pump power is constant, and the cooling capacity of the heat sink 10 can be increased. As a matter of course, a part of the lid 18 (partition wall portion 60) exists between the diversion header 58 and the merge header 59 and blocks the refrigerant passages 36 and 38. The shunt header and the merge header can also be formed by retracting the fins 40 and 42 from the first end opening 26.

Embodiment 4 FIG.

  As shown in FIGS. 5 and 6, the partition wall 60 of the lid 18 protrudes toward the inside of the cylindrical body to form a protruding partition wall 62, and a groove 64 extending in the lateral direction is formed in the protruding partition wall 62. A protrusion 66 to be fitted into the groove 64 may be formed at a corresponding position of 44, and the protrusion 66 may be fitted into the groove 64 when the lid 18 is attached to the cylinder portion 16 to which the partition wall 44 is attached. In this case, the sealing performance between the partition wall 44 and the lid 18 is further improved. In this modification, the protruding partition wall 62 is not necessarily required, and a groove 67 into which the protrusion 66 is fitted in the partition wall 60 may be formed as shown in FIG.

Embodiment 5 FIG.

  The refrigerant flowing in the refrigerant passage diffuses in the direction from the proximal end of the fin toward the distal end. For example, in the first refrigerant passage, the refrigerant that has passed near the proximal end of the fin flows in the second refrigerant passage on the distal end side of the fin. Thus, it is preferable to make maximum use of the heat absorption capacity of the refrigerant by replacing at least a part thereof. Therefore, for example, as shown in FIG. 8, the partition wall 44 is in the vicinity of the communication path 50 that communicates the refrigerant flow paths 36 and 38, and at the upstream end portion of the second refrigerant flow path 38. The stirring unit 68 has a quadrangular vertical section (a cross section in the direction of the central axis 22 is quadrangular) formed so as to protrude toward the center. As shown in the drawing, the stirring unit 68 may be provided continuously in the horizontal direction, or may be provided intermittently in the horizontal direction, although not shown. In order to avoid interference with the fins 42, the stirring portion 68 may be formed with fin insertion slots 70 at positions corresponding to the fins 42, and the ends of the fins 42 may be inserted into the slots 70. The shape (longitudinal section) of the stirring unit 68 is not limited to that shown in FIG. 8, and may be, for example, a triangle shown in FIG. 9 or an arc shape shown in FIG. 10.

  By providing such a stirring unit 68, the refrigerant 56 that has moved to the second refrigerant passage 38 through the communication passage 50 has a portion of the refrigerant that has passed through the fin end side in the first refrigerant passage 36 as the second refrigerant. In the passage 38, the refrigerant moves to the fin base end side, and conversely, a part of the refrigerant that has passed through the fin base end side in the first refrigerant passage 36 moves to the fin distal end side in the second refrigerant passage 38. The heat exchange at the fin base end portion having a high height is promoted, and the cooling capacity of the heat sink 10 is further improved as a whole.

Embodiment 6 FIG.

  In order to further improve the cooling capacity of the heat sink 10, rod-shaped turbulent flow promotion pins 72 may be provided on both surfaces of the partition wall 44 as shown in FIG. The turbulent flow promotion pin 72 disturbs the flow of the refrigerant in the flow path and suppresses the development of the temperature boundary layer around the fins 40 and 42. Naturally, in order to prevent the turbulent flow promotion pins 72 from interfering with the fins 40 and 42 when the partition wall 44 is attached to the cylindrical portion 16, the turbulent flow promotion pins 72 are arranged on the adjacent fins 40, 40, 42 and 42. Try to be in between.

  The distance (interval in the direction of the central axis 22), the length, the thickness, and the shape of the turbulent flow promotion pins 72 are the resistance to the flow of the refrigerant 56 of the turbulent flow promotion pins 72, particularly the flow of the refrigerant around the fins 40 and 42. Determine in consideration of For example, the thickness (diameter) of the turbulent flow promotion pin 72 is determined so that a gap of, for example, about 0.1 mm to 1 mm is secured between the adjacent fins 40 or 42.

  Thus, by disposing the turbulent flow promotion pin 72 between the fins 40 and 42, the temperature boundary layer formed near the surface of the fins 40 and 42 is disturbed, and heat exchange between the fins and the refrigerant is promoted. The cooling performance of the heat sink 10 can be further improved. As shown in FIG. 12, the turbulence promoting pin 72 approaches both sides of the fins 40 and 42 in the direction orthogonal to the central axis 22, and between the adjacent turbulence promoting pins 72 as much as possible. It is preferable to secure a large flow path. If the turbulent flow promotion pin 72 is disposed near the center of the inter-fin flow path, heat exchange between the fin and the refrigerant is promoted, but the pressure loss of the refrigerant increases.

  The preferred turbulent flow promotion pin 72 has a triangular cross section as shown in FIG. 13 and a wing shape (a shape having a cross section of the wing) as shown in FIG. 14, and fins from the upstream side to the downstream side in the refrigerant flow direction. An inclined surface 74 that gradually approaches 40 and 42 is provided. According to such a shape, the refrigerant flowing in the direction of the arrow in the figure is deflected by the forward inclined surface 74 of the pin in the vicinity of the fins 40 and 42 and increases its speed, and collides with the surfaces of the fins 40 and 42 vigorously. To do. As a result, the temperature boundary layer on the fin surface is efficiently destroyed, so that the heat exchange capability of the fin is always kept good. On the other side of the inclined surface 74, the flow of the refrigerant 56 is disturbed, and the heat recovered from the fins is efficiently diffused.

Embodiment 7 FIG.

  As shown in FIGS. 15 and 16, the partition wall 44 can be composed of two members, an upper partition wall portion 78 and a lower partition wall portion 80. The lower partition wall 80 shown in FIG. 16 is obtained by inverting the upper partition wall 78 shown in FIG. 15 up and down around a horizontal axis orthogonal to the central axis 22, and the upper partition wall 78 and the lower partition wall 80 are It is substantially the same member.

  Referring to FIG. 15, the upper partition 78 has an upper wall 82, a lower wall 84, left and right side walls 86, and an end wall 88 that connects these four walls at one end side in the direction of the central axis 22. A hollow portion 90 having a flat space is formed between the five walls. The upper wall 82 has a plurality of slots 94 extending in parallel with the central axis 22 from the end surface 92 opposite to the end wall 88 toward the end wall 88 with a predetermined interval in a direction perpendicular to the central axis 22. Is formed. The distance between the slots 94 is substantially the same as the distance between the corresponding fins 40, 42, and the ends of the fins 40, 42 are arranged so as to fit into the slots 94 when attached to the housing 14.

  As described above, the upper partition wall 78 configured as described above is overlapped with the lower partition wall 80 obtained by reversing the partition wall up and down and front and rear, and the first end opening 26 (first By inserting the slot opening 98 of the upper partition wall portion 78 and the slot end 96 of the lower partition wall portion 80 toward the front (front side in the insertion direction) between the upper and lower fins 40 and 42 from the opening close to the lid 18). Installed. In the mounted state, the ends of the fins 40 and 42 are fitted into the slots 94 of the partition walls 78 and 80.

  The width of the slot 94 is determined according to the width of the fins 40 and 42 as will be described later, and is, for example, about 0.1 mm to 1 mm larger than the width of the fins 40 and 42. Therefore, the slot 94 is not filled with the end of the fins 40 and 42. Therefore, the slot 94 becomes a flow path for the refrigerant 56 to flow into the hollow portion 90. Further, as described above, by attaching the slot end 96 to the upstream side in the refrigerant flow direction and the slot opening 98 to the downstream side in the refrigerant flow direction, the pressure of the hollow portion 90 is near the fins 40 and 42. It becomes lower than the pressure of the refrigerant | coolant 56 which flows through. Due to such a pressure gradient, a flow that flows into the hollow portion 90 of the slot 94 from the vicinity of the fins 40 and 42 is generated.

  The refrigerant in the vicinity of the fins 40 and 42 receives heat from the fins and has a high temperature. Part of the refrigerant in the vicinity of the surfaces of the fins 40 and 42 that has reached a high temperature flows into the hollow portion 90 through the slot 94. As a result, the temperature of the refrigerant flowing between the fins 40 and 42 in the direction parallel to the central axis 22 is reduced (development of the temperature boundary layer is suppressed), and heat exchange between the fins and the refrigerant is promoted. The refrigerant 56 in the hollow portion 90 proceeds toward the hollow portion opening on the downstream side, and when passing through the hollow portion opening, the refrigerant 56 merges with the refrigerant that has passed through the lower refrigerant passage 36 and passes through the communication passage 50, thereby passing through the upper refrigerant passage. Enter 38. In the upper refrigerant passage 38, the flow of the refrigerant 56 from the base end to the end of the fin 40 is formed similarly to the flow of the refrigerant 56 in the lower refrigerant passage 36 described above, and the temperature formed on the surface of the fin 42 by the flow. Development of the boundary layer is suppressed. The refrigerant 56 in the hollow portion 90 travels toward the downstream hollow portion opening, and after passing through the hollow portion opening, merges with the refrigerant that has passed through the upper refrigerant passage 38 and is discharged from the refrigerant outflow passage 54. .

  The width of the slot 94 is larger than the width of the fins 40 and 42 as described above. However, if the slot 94 is too large, more refrigerant 56 flows into the hollow portion 90, and the periphery of the fins 40 and 42 on the base end side from the slot 94 is increased. The flow rate of the flowing refrigerant 56 becomes slow. Therefore, considering the improvement of the cooling performance obtained by suppressing the development of the temperature boundary layer by the pressure gradient in the height direction of the fins 40 and 42, and the reduction of the cooling performance due to the decrease in the flow velocity of the refrigerant 56, as a result The width of the slot 94 may be determined so that the cooling performance of the heat sink is improved.

  Further, the width of the slot 94 may gradually increase from the slot end 96 (upstream side) to the slot opening 98 (downstream side). Since the temperature boundary layer is generally not developed on the upstream side, the cooling performance of the heat sink is improved by increasing the flow rate of the refrigerant 56 by narrowing the width of the slot 94 on the slot end 96 side. Further, since the temperature boundary layer generally develops on the downstream side, the cooling performance of the heat sink is improved by suppressing the development of the temperature boundary layer by increasing the width of the slot 94 on the slot opening 98 side. Thus, by gradually increasing the width of the slot 94 from the upstream side to the downstream side of the refrigerant 56, it is possible to improve the cooling performance of the heat sink.

  According to the partition wall as described above, the development of the temperature boundary layer that expands toward the downstream can be suppressed on the fin surface, and the heat transfer between the fin and the refrigerant is promoted to further improve the cooling performance of the heat sink. be able to.

  As described above, according to the present embodiment, the development of the temperature boundary layer formed on the surface of the fin is suppressed by the flow of the refrigerant from the base end toward the end along the fin. The cooling capacity of the heat sink 10 is efficiently exhibited as much as possible.

  Further, in the present embodiment, the partition wall 44 is disposed apart from the upper and lower fins 40 and 42, so that the partition wall 44 is covered at a position facing the side wall 34 of the housing tubular portion 16 as shown in FIG. A guide protrusion 100 or a protrusion (first engagement portion) is provided, and a guide groove 102 (second engagement portion) is provided on the housing side wall 34 opposite to the guide protrusion 100 or protrusion (first engagement portion). It is preferable that the partition wall 44 is stably supported by the housing tube portion 16 by the cooperation. The upper partition wall 78 and the lower partition wall 80 described in the present embodiment are made of resin, aluminum, copper, or the like, and are formed by extrusion molding, injection molding, die casting, or the like.

Embodiment 8 FIG.

  In the embodiments so far, the partition wall is substantially a flat plate, that is, the partition wall has a flat cross-sectional shape viewed from the direction of the central axis 22, but the shape of the partition wall is not limited thereto. For example, FIG. 18 is a perspective view of a partition wall having a “H” sectional shape as viewed from the direction of the central axis 22. The partition wall 104 includes a flat plate portion 106 and filling portions 108 provided on both sides of the flat plate portion 106. The filling portion 108 is provided on both sides of the flat plate portion 106, is in close contact with the left and right side walls 34, and protrudes toward the lower wall 30 and the upper wall 32. The space between the fins 40 and 42 and the left and right side walls 34 is filled.

  Such a partition 104 is used, for example, when the fins 40 and 42 are provided in the central portion of the cylindrical portion 16 in the cross section of the cylindrical portion 16 as viewed from the direction of the central axis 22 and are not provided near both ends. By the partition wall 104 having the filling portion 108, the space between the fins 40, 42 located at both ends of the cylindrical portion 16 and the inner surface of the side wall 34 can be filled with the filling portion 108, and the upper refrigerant passage 38 and the lower refrigerant passage 36 are formed. The flow rate of the flowing refrigerant 56 can be increased. Therefore, it is possible to improve the cooling performance of the heat sink. This is particularly effective when the heating element 12 is disposed at the center portion of the outer surface of the lower wall 30, the center portion of the outer surface of the upper wall 32, or any one of them.

Embodiment 9 FIG.

  The lids 18 and 20 have a size corresponding to the shape of the end face of the cylindrical portion 16, but the lid 18 may be of a size that at least covers the end face of the cylindrical portion 16. As shown in FIG. It may be larger than 16 end face shapes. The refrigerant 56 is fed from a hose (not shown) connected to the refrigerant inflow passage 52 to the first refrigerant passage 36 and is connected to the refrigerant outflow passage 54 from the second refrigerant passage 38 (not shown). ). In the case where the cross-sectional shape of the hose is, for example, a circle, each refrigerant flow path 36 is used to send the refrigerant to the first refrigerant passage 36 with sufficient pressure and to smoothly discharge the refrigerant from the second refrigerant flow path 38. , 38 and use a hose with a diameter larger than the height, and connect it to the lid 18. Therefore, the lid 18 is larger than the end surface of the cylindrical portion 16 so that a hose having a sufficiently large diameter can be connected.

Embodiment 10 FIG.

  The present invention can also be realized as an electric device to which the heat sink described in the above embodiments is attached. The electric device is a device including an inverter, a converter, an electric circuit, a semiconductor device and the like as a heating element. The heating element is attached in contact with the periphery of the heat sink.

  In addition, although several embodiment was demonstrated separately above, these several embodiment can each be implemented independently, and can be implemented in combination with other embodiment. Naturally, an example in which a plurality of embodiments are combined can exhibit the individual effects of the plurality of embodiments.

1 is a perspective view illustrating an appearance of a heat sink according to Embodiment 1. FIG. 1 is a side sectional view showing an entire heat sink according to a first embodiment. It is a perspective view of the hollow square tube to which the partition of Embodiment 1 was attached. FIG. 10 is a perspective view showing an appearance of a first lid of a third embodiment. FIG. 10 is a perspective view of a first lid according to the fourth embodiment. It is a perspective view of the partition of Embodiment 4. FIG. 10 is a side cross-sectional view of a first lid of a modification of the fourth embodiment. It is a perspective view of the 1st example of the partition of Embodiment 5. FIG. It is a perspective view of the 2nd example of the partition of Embodiment 5. It is a side view of the 3rd example of the partition of Embodiment 5. It is a perspective view which shows the 1st example of the partition of Embodiment 6. FIG. It is a front view which shows the state which attached the partition of the 1st example of Embodiment 6 to the cylinder part. It is a perspective view which shows the 2nd example of the partition of Embodiment 6. FIG. FIG. 24 is a perspective view showing a third example of the partition wall according to the sixth embodiment. It is a perspective view which shows the upper partition part of the partition of Embodiment 7. FIG. It is a perspective view which shows the lower partition part of the partition of Embodiment 7. FIG. It is a front view which shows the state which attached the partition of Embodiment 7 to the cylinder part. FIG. 10 is a perspective view of a partition wall according to an eighth embodiment. 10 is a side sectional view of a lid according to a ninth embodiment. FIG.

Explanation of symbols

10: heat sink 12: heating element 14: housing 16: tube 18: first lid 20: second lid 22: central axis 24: inner space 26: first end opening 28: second end Part opening 30: lower wall 32: upper wall 34: side wall 36: first refrigerant passage 38: second refrigerant passage 40: first fin 42: second fin 44: partition 46: one end 48 of the partition 48: The other end 50 of the partition wall: the communication path 52: the refrigerant inflow path (first refrigerant path)
54: Refrigerant outflow path (second refrigerant path)
56: Refrigerant 58: Shunt header 59: Merge header 60: Partition 62: Projecting partition 64, 67: Groove 66: Projection 68: Stirrer 70: Fin insertion slot 72: Turbulence promotion pin 74: Inclined surface 78: Upper partition wall portion 80: Lower partition wall portion 82: Upper wall 84: Lower wall 86: Side wall 88: End wall 90: Hollow portion 92: End wall 94: Slot 96: Slot opening 98: Slot end 100: Projection 102: Guide groove 104 : Partition wall 106: flat plate part 108: filling part

Claims (12)

A heat sink attached to the heating element for cooling the heating element,
A housing forming a first refrigerant channel and a second refrigerant channel adjacent to the first refrigerant channel;
A partition wall disposed between the first and second refrigerant flow paths and separating the first and second refrigerant flow paths;
A plurality of first fins protruding into the first refrigerant flow path and a plurality of second fins protruding into the second refrigerant flow path are formed integrally with the housing. And heat sink.   Furthermore, it is provided on the downstream side of the first refrigerant flow path and the upstream side of the second refrigerant flow path, and includes a communication path that communicates the first and second refrigerant flow paths. The heat sink according to claim 1. The housing includes a first end opening located upstream of the first refrigerant flow path and downstream of the second refrigerant flow path, and a downstream side of the first refrigerant flow path. And having a second end opening located upstream of the second refrigerant flow path,
The heat sink according to claim 1 or 2, wherein the housing has first and second lids for closing the first and second end openings, respectively.   An end of the partition located downstream of the first flow path and upstream of the second flow path is disposed away from the second end opening to form the communication path. The heat sink according to claim 3, wherein the heat sink is provided.   The heat sink according to claim 3, wherein the partition wall continuously extends between the first and second end opening portions, and the communication path is formed in the partition wall.   6. The first lid according to claim 3, further comprising a first passage communicating with the first refrigerant flow path and a second passage communicating with the second refrigerant flow path. Heat sink according to item.   The first passage is in direct communication with the first refrigerant flow path, and includes a diversion header that disperses the refrigerant in the first refrigerant flow path, and the second passage includes the second refrigerant flow. The heat sink according to claim 6, further comprising a merge header that directly communicates with a path and collects the refrigerant from the second refrigerant flow path.   An agitating portion that protrudes from the first or second flow path is formed at the end of the partition located downstream of the first flow path and upstream of the second flow path. The heat sink according to any one of claims 1 to 7, wherein the heat sink is formed.   The heat sink according to any one of claims 1 to 8, wherein the partition wall includes a turbulence promoting pin between at least one of the first and second fins. The partition is
A hollow portion surrounded by a wall, a slot provided in the wall at a position facing the first fin, a first partition wall portion having an opening on the downstream side of the first refrigerant flow path,
A hollow portion surrounded by a wall; a slot provided in the wall at a position facing the second fin; and a second partition wall portion having an opening on the downstream side of the second refrigerant flow path. The heat sink according to claim 1, wherein the heat sink is configured.   The partition has a first engagement portion that guides to a mounting position on the housing, and the housing engages with the first engagement portion and guides the partition. The heat sink according to claim 1, comprising: An electrical device including a heating element,
Comprising a heat sink attached to the heating element;
The heat sink is
A housing forming a first refrigerant channel and a second refrigerant channel adjacent to the first refrigerant channel;
A partition wall disposed between the first and second refrigerant flow paths and separating the first and second refrigerant flow paths;
A plurality of first fins protruding into the first refrigerant flow path and a plurality of second fins protruding into the second refrigerant flow path are formed integrally with the housing. And electrical equipment.

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