JP2013026307A - Heat sink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling efficiency without deteriorating the attachment/detachment workability of a water cooling jacket.SOLUTION: A heat sink A includes: a water cooling jacket 10 having a water passage 17 of a coolant; a base member 30 provided in the vicinity of a CPU 51 (heating member) and enabling the attachment/detachment of the water cooling jacket 10; a heat receiving plate 35 (heat receiving part) forming a heat transmission path 49 for transmitting heat received from the CPU to the coolant in the water passage 17; and holding means 45 holding the heat receiving plate 35 in the state that contacts with the CPU 51.

Description

  The present invention relates to a heat sink.

  Patent Document 1 discloses a water-cooled heat sink. The heat sink is provided so as to be inserted into a gap between a plurality of electronic devices arranged in parallel by being guided by the guide rail, and can be extracted from between the electronic devices along the guide rail. ing.

JP 2008-53348 A

The above heat sink has a gap between the heat sink and the electronic device in order to avoid a decrease in workability due to sliding resistance when the heat sink is attached / detached. If there is a gap, there is a problem that the heat transfer efficiency from the electronic device to the heat sink is poor.
The present invention has been completed based on the above-described circumstances, and an object thereof is to improve the cooling efficiency without deteriorating the detachability workability of the water cooling jacket.

  As means for achieving the above-mentioned object, the invention of claim 1 includes a water-cooling jacket having a cooling water channel, a base member provided in the vicinity of the heat-generating member and capable of attaching and detaching the water-cooling jacket, and heat generation. A heat receiving portion that constitutes a heat transfer path for transferring heat received from the member to the cooling water in the water passage, and a holding means for holding the heat receiving portion in contact with the heat generating member. Has characteristics.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the holding means is configured to include a contact spring that urges the heat receiving portion in a direction to contact the heat generating member. .

  According to a third aspect of the present invention, the heat receiving portion is provided in the base member according to the first or second aspect, and the base member is engaged with the water cooling jacket and the water cooling jacket is mounted. A latching member that is displaceable between a latching state that is held in a locking state and a unlocking state that unlocks the water-cooling jacket, and the latching member is biased in the latching direction, and the latching member is And a dual-purpose spring that urges the water-cooling jacket in a direction to contact the heat receiving portion.

  The invention of claim 4 is characterized in that in any one of claims 1 to 3, a fin for air cooling is provided.

<Invention of Claim 1>
When the water cooling jacket is attached to the base member and the heat receiving part is brought into contact with the heat generating member by the holding means, the heat generated from the heat generating member is directly transmitted to the heat receiving part and is cooled in the water cooling jacket through the heat transfer path. Transmitted to water. Since the heat receiving part is brought into direct contact with the heat generating member, the cooling efficiency is better than when a gap is interposed between the heat receiving part and the heat generating member.

<Invention of Claim 2>
Since the heat receiving portion is urged by the contact spring in the direction of contacting the heat generating member, the thermal expansion and dimensional tolerance of each member can be absorbed and the heat receiving portion can be reliably brought into contact with the heat generating member.

<Invention of Claim 3>
The dual-purpose spring has both the function of urging the locking member in the locking direction to hold the water-cooling jacket in the mounted state and the function of bringing the water-cooling jacket into contact with the heat receiving part to increase the cooling efficiency. Compared to the case where the function is performed by separate springs, the number of parts can be reduced.

<Invention of Claim 4>
Since the air-cooling fins are provided, even if the cooling function by the cooling water is obstructed, a significant decrease in the cooling function can be avoided.

Sectional drawing showing the state which attached the heat sink of Embodiment 1 to the circuit board Cross section of heat sink Partial cutaway plan view of the base member Partial cutaway bottom view of base member Top view of water cooling jacket Bottom view of water cooling jacket with heat transfer plate removed Cross section of water cooling jacket Sectional drawing showing the state which attached the heat sink of Embodiment 2 to the circuit board Cross section of heat sink Top view of base member Top view of water cooling jacket Top view of heat receiving plate Sectional view showing the water cooling jacket locked to the base member Sectional drawing which shows the state which the latching of the water cooling jacket with respect to the base member was cancelled | released

<Embodiment 1>
A first embodiment of the present invention will be described below with reference to FIGS. The heat sink A according to the first embodiment is attached to a horizontally arranged circuit board 50 and is for cooling a CPU 51 (a heat generating member which is a constituent element of the present invention) mounted on the upper surface of the circuit board 50. The upper surface of the CPU 51 is a heat radiating surface 52 parallel to the circuit board 50, and the heat sink A cools by taking heat from the heat radiating surface 52.

  The heat sink A is provided in the vicinity of the CPU 51 with the water cooling jacket 10 having a cooling water passage 17 therein, a base member 30 that allows the water cooling jacket 10 to be attached and detached, and the heat received from the CPU 51 is cooled in the water passage 17. A heat receiving plate 35 (a heat receiving portion which is a constituent element of the present invention) constituting a heat transfer path 49 for transferring to water, and a holding means 45 for holding the heat receiving plate 35 in contact with the CPU 51 are provided. .

  The water cooling jacket 10 includes a jacket main body 11 made of a metal material having a high thermal conductivity and a heat transfer plate 16 made of a metal material having a high thermal conductivity and fixed to the jacket main body 11 so as to cover the entire lower surface of the jacket main body 11. And a heat transfer path 49) which is a constituent element of the invention. A rear end edge portion of the jacket main body 11 is a thick base portion 12, and a wide area in front of the base portion 12 of the jacket main body 11 is a heat absorbing portion 13 having a thin card shape.

  A pair of left and right connection holes 14 that open to the rear surface of the base 12 are formed inside the base 12, and the axis of each connection hole 14 extends in the front-rear direction (a direction substantially parallel to the circuit board 50 and the heat dissipation surface 52). A plug 15 is attached in a liquid-tight manner. The pair of plugs 15 are connected to hoses (not shown) extended from a cooling water circulation device (not shown) for circulating the cooling water.

  In the heat absorbing portion 13, a single water channel 17 is formed in a shape that is bent into a ninety-nine fold shape by notching the lower surface of the jacket body 11 into a groove shape, and is closed in a liquid-tight manner by the heat transfer plate 16. Is formed. Both ends of the water channel 17 communicate with the pair of connection holes 14 via the communication holes 18. The cooling water flowing in from one plug 15 sequentially passes through one connection hole 14, one communication hole 18, a water channel 17, the other communication hole 18, and the other connection hole 14, and from the other plug 15 to the outside of the water cooling jacket 10. Spill to Since the heat transfer plate 16 directly faces the water channel 17, the cooling water passes through the water channel 17 while being in contact with the upper surface of the heat transfer plate 16. While passing through the water channel 17, the cooling water takes heat from the heat transfer plate 16.

  The jacket main body 11 is formed with a locking recess 19 in which the upper surface of the rear end portion of the heat absorbing portion 13 is shallowly recessed. An operating member 20 that can be relatively displaced in the front-rear direction is provided through the base 12. A release member 21 having a plate shape bent in a substantially L shape is fixed to the front end portion of the operation member 20, and the front end portion of the release member 21 is accommodated in the locking recess 19. The release member 21 is normally held in a state of being retracted to the rear end portion of the locking recess 19 by urging of the retracting spring 22.

  The base member 30 includes a housing 31 and four sets of holding means 45 for attaching the housing 31 to the circuit board 50 so that the housing 31 can be displaced in a vertical direction (a direction substantially perpendicular to the plate surface of the circuit board 50). ing. The housing 31 is made of a metal material having a high thermal conductivity so as to cover a rectangular frame 32 substantially parallel to the circuit board 50 and a rectangular through hole mounting hole 33 formed at the center of the frame 32 from above. And a heat receiving plate 35 made of a metal material having a high thermal conductivity and attached to the frame 32 so as to close the attachment hole 33 from the lower surface side. The lower surface of the heat receiving plate 35 protrudes downward from the lower surface of the frame 32.

  On the upper surface side of the frame 32, an accommodation space 36 that is surrounded by the cover 34 and the heat receiving plate 35 and opens in a horizontally long slit shape only on the rear surface side is formed. The lower surface wall of the accommodation space 36 is constituted by a heat receiving plate 35, and the upper surface of the heat receiving plate 35 faces the accommodation space 36. A pressing member 37 capable of sliding in the front-rear direction is accommodated at the rear end portion in the accommodation space 36. The pressing member 37 is urged rearward by a return spring 38.

  Inside the accommodation space 36 is housed a plate-like locking member 40 supported so as to be able to swing in the vertical direction with the swing shaft 39 at the front end as a fulcrum. A locking projection 41 that protrudes downward is formed at a position slightly ahead of the rear end edge of the locking member 40. The locking member 40 is formed with an inclined surface 42 extending obliquely upward and rearward from the lower end edge of the locking protrusion 41 toward the front end edge of the locking member 40. The inclined surface 42 is inclined with respect to both the front-rear direction (the direction in which the water cooling jacket 10 is attached to and detached from the base member 30) and the up-down direction (the swinging direction of the locking member 40). The rocking range of the locking member 40 includes the uppermost position (released state) where the front edge of the locking member 40 hits the ceiling surface of the cover 34 and the lowermost position (locked state) where the stopper member 43 abuts. It is between. The locking member 40 is normally held at the lowermost position by a combined spring 44 provided between the upper surface of the locking member 40 and the ceiling surface of the cover 34.

  The holding means 45 is mounted between a screw 46 that passes downward through the four corners of the frame 32, a cylindrical spacer 47 that is screwed to the screw below the frame 32, and the upper surface of the frame 32 and the screw head. And a contact spring 48 made of a compression coil spring. When the base member 30 is removed from the circuit board 50, the frame 32 is held in a state of being pressed against the upper end surface of the spacer 47 by the urging force of the contact spring 48.

  When the heat sink A is attached to the circuit board 50, the base member 30 is disposed so as to cover the CPU 51 from above, the screw 46 is screwed into a predetermined position of the circuit board 50, and the lower end of the spacer 47 is placed on the upper surface of the circuit board 50. Make contact. Here, the height of the spacer 47 is lower than the height of the heat radiation surface 52 (upper surface) of the CPU 51 with respect to the upper surface of the circuit board 50, and the heat receiving plate 35 projects downward from the lower surface of the frame 32. . Therefore, the lower surface of the heat receiving plate 35 contacts the heat radiating surface 52 of the CPU 51, and the frame 32 is disposed above the upper surface of the spacer 47 in a state where the contact spring 48 is elastically deformed. Due to the elastic restoring force of the contact spring 48, the lower surface of the heat receiving plate 35 comes into surface contact with the heat radiating surface 52 while being elastically pressed.

  With the base member 30 attached to the circuit board 50, the heat-absorbing part 13 having a card shape of the water-cooling jacket 10 is inserted into the accommodation space 36. In the insertion process, the front end edge of the heat absorbing portion 13 pushes up the front end portion of the locking member 40 against the bias of the dual purpose spring 44, so that the locking member 40 is displaced to the released state. At the end of the insertion process, the front end edge of the heat absorbing portion 13 pushes the pressing member 37 forward (backward of the accommodation space 36) against the biasing force of the return spring 38.

  Then, when the water cooling jacket 10 reaches the normal insertion state, the locking member 40 is elastically returned to the lower locking state, and the locking projection 41 is locked to the inner wall of the front end of the locking recess 19. As a result, the water cooling jacket 10 is locked in a state in which the backward cooling with respect to the base member 30 is restricted. At this time, the dual purpose spring 44 is biased in the direction of increasing the locking allowance of the locking projection 41 with respect to the locking recess 19. Further, the return spring 38 presses the locking projection 41 against the inner wall of the front end of the locking recess 19 and urges the both in the direction of increasing the frictional resistance between them. When the water cooling jacket 10 is correctly attached to the base member 30, the locking protrusion 41 elastically presses the heat absorbing portion 13 downward by the bias of the dual purpose spring 44, so that the lower surface of the heat transfer plate 16 is the heat receiving plate. The upper surface of 35 is held in a state of being in elastic surface contact.

  In this state where the water cooling jacket 10 is attached to the base member 30, the heat generated by the CPU 51 is transmitted to the cooling water in the water passage 17 through the heat receiving plate 35 and the heat transfer plate 16. During this time, the cooling water that has deprived of heat flows out of the water cooling jacket 10 and low-temperature cooling water flows into the water cooling jacket 10, so that the CPU 51 is effectively cooled.

  When the cooling of the CPU 51 is temporarily interrupted for maintenance or replacement of the circuit board 50, the water cooling jacket 10 is removed from the base member 30. At this time, when the operation member 20 is pushed backward, the release member 21 pushes the inclined surface 42 of the locking member 40 and pushes up the locking member 40, so that the locking state between the locking protrusion 41 and the locking recess 19 is established. Canceled. Along with this, the water cooling jacket 10 is pushed rearward by the biasing force of the return spring 38, so that it is discharged out of the accommodation space 36. Thereafter, the base 12 may be grasped and the water cooling jacket 10 may be pulled out of the accommodation space 36.

  In the heat sink A of the first embodiment, when the water cooling jacket 10 is attached to the base member 30 and the heat receiving plate 35 is brought into contact with the CPU 51 by the holding means 45, the heat generated from the CPU 51 is directly transmitted to the heat receiving plate 35. The heat transfer path 49 (the heat receiving plate 35 and the heat transfer plate 16) is transmitted to the cooling water in the water cooling jacket 10. Since the heat receiving plate 35 is brought into direct contact with the CPU 51, the cooling efficiency is better than when a gap (air) is interposed between the heat receiving plate 35 and the CPU 51. Thus, according to the present embodiment, it is possible to improve the cooling efficiency without deteriorating the detachability workability of the water cooling jacket 10.

  Further, since the holding means 45 includes a contact spring 48 that urges the heat receiving plate 35 in the direction in which the heat receiving plate 35 contacts the CPU 51, the holding means 45 absorbs thermal expansion and dimensional tolerance of each member to The CPU 51 can be surely brought into contact.

  In addition, a heat receiving plate 35 is provided on the base member 30, and the base member 30 is engaged with the water cooling jacket 10 to hold the water cooling jacket 10 in the mounted state, and is released to release the engagement with the water cooling jacket 10. The locking member 40 that is displaceable between the states and the locking member 40 are biased in the locking direction, and the water cooling jacket 10 is biased in the direction of contacting the heat receiving plate 35 via the locking member 40. A dual-purpose spring 44 is provided. The combined spring 44 has a function of urging the locking member 40 in the locking direction to hold the water cooling jacket 10 in a mounted state, and a function of bringing the water cooling jacket 10 into contact with the heat receiving plate 35 to increase the cooling efficiency. Therefore, the number of parts can be reduced compared to the case where both functions are exhibited by separate springs.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS. The heat sink B according to the second embodiment is attached to a horizontally arranged circuit board 50 and is for cooling a CPU 51 (a heat generating member which is a constituent element of the present invention) mounted on the upper surface of the circuit board 50. The upper surface of the CPU 51 is a heat radiating surface 52 parallel to the circuit board 50, and the heat sink B cools by taking heat from the heat radiating surface 52.

  The heat sink B is provided in the vicinity of the CPU 51 with a water cooling jacket 60 having a cooling water channel 67 therein, a base member 80 that allows the water cooling jacket 60 to be attached and detached, and heat received from the CPU 51 in the water channel 67. A heat receiving plate 65 (a heat receiving portion which is a constituent element of the present invention) constituting a heat transfer path 79 for transferring to the cooling water, and a holding means 70 for holding the heat receiving plate 65 in a state in contact with the CPU 51 are provided. Yes.

  The water cooling jacket 60 includes a jacket body 61 made of a metal material having a high thermal conductivity and a substantially square heat receiving member made of a metal material having a high thermal conductivity and fixed to the jacket body 61 so as to cover almost the entire lower surface thereof. And a plate 65. The jacket body 61 is formed with a pair of left and right connection holes 62 opened on the upper surface thereof. Each connection hole 62 has a plug whose axis is directed in the vertical direction (a direction substantially perpendicular to the circuit board 50 and the heat radiation surface 52). 63 is attached in a liquid-tight manner. The pair of plugs 63 are connected to hoses (not shown) extending from a cooling water circulation device (not shown) for circulating the cooling water.

  The jacket main body 61 is formed with an accommodation recess 64 having a lower surface that is shallowly recessed in a substantially square shape. The pair of connection holes 62 communicate with both left and right ends of the ceiling surface of the housing recess 64. The housing recess 64 is liquid-tightly closed by the heat receiving plate 65. On the upper surface of the heat receiving plate 65, a plurality of ribs 66 are formed at a constant pitch in the front-rear direction and project in a shape that is elongated in the left-right direction, and the plurality of ribs 66 are accommodated in the accommodation recess 64. Yes. The formation range of the rib 66 in the left-right direction is a region excluding the left and right ends of the housing recess 64, and the upper edge of the rib 66 is in contact with or close to the ceiling surface of the housing recess 64. . By the rib 66, the housing recess 64 closed by the heat receiving plate 65 is constituted by a plurality of through passages 68 penetrating in the left-right direction (direction connecting the pair of plugs 63) and arranged in parallel in the front-rear direction. A water channel 67 is formed.

  The cooling water flowing from one plug 63 passes through one connection hole 62, the plurality of through passages 68, and the other connection hole 62 in order, and flows out of the water cooling jacket 60 from the other plug 63. Since the upper surface of the heat receiving plate 65 directly faces the water channel 67, the cooling water passes through the water channel 67 while being in contact with the upper surface of the heat receiving plate 65. The cooling water takes heat from the heat receiving plate 65 while passing through the water channel 67. The water-cooling jacket 60 is formed with air-cooling fins 69 composed of a plurality of plate pieces protruding from the upper surface of the jacket body 61. The formation area of the fin 69 is generally opposed to both the formations of the water channel 67.

  The holding means 70 will be described. A pair of support portions 71 are formed at the left and right ends of the water cooling jacket 60. The lower surface of the support portion 71 is located above the lower surface of the heat receiving plate 65. A connecting member 72 composed of a pair of front and rear screws is passed through the support portion 71, a locking plate 73 is fixed to the lower end portion of the connecting member 72, and a pressing plate 74 is fixed to the upper end portion of the connecting member 72. . In addition, a contact spring 75 made up of a compression coil spring whose axis is directed in the vertical direction is accommodated in the support portion 71, and the upper end of the contact spring 75 is in contact with the lower surface of the pressing plate 74. By the urging of the contact spring 75, the water cooling jacket 60 is held in a state where the support portion 71 is in contact with the upper surface of the locking plate 73.

  The base member 80 includes a frame 81 in which a square mounting hole 82 is formed in the center, and a pair of accommodating portions 83 provided at both left and right edges of the frame 81. The pair of accommodating portions 83 are opened to the inwardly facing side surfaces and the upper surface facing each other, and the locking member 84 is accommodated in the accommodating portion 83 so as to be slidable in the left-right direction. The locking member 84 includes a locking protrusion 85 that protrudes from the opening on the inward side surface of the housing portion 83, and an operation portion 86 that protrudes from the opening on the top surface of the housing portion 83. The locking member 84 is biased by a locking spring 87 in a direction in which the locking projection 85 protrudes inward.

  When the heat sink B is attached to the circuit board 50, the base member 80 is disposed so that the attachment hole 82 corresponds to the CPU 51, and the frame 81 (base member 80) is fixed to the circuit board 50 with screws (not shown). Thereafter, the water cooling jacket 60 is assembled to the base member 80 so as to drop into the mounting hole 82 from above. Since the locking plate 73 abuts against the locking member 84 during the assembly, the pressing member 74 is pushed from above so that the locking member 84 is resisted against the bias of the locking spring 87. The assembly of the water cooling jacket 60 is advanced while retracting to the side.

  When the water-cooling jacket 60 is in the proper assembled state, the locking plate 73 is locked to the locking protrusion 85 and the upward displacement is restricted. In addition, since the lower surface of the heat receiving plate 65 comes into contact with the upper surface (heat radiation surface 52) of the CPU 51 at the end of assembly, the water cooling jacket 60 rises with respect to the locking plate 73 against the urging of the contact spring 75. . Then, the lower surface of the heat receiving plate 65 is held in an elastic surface contact with the heat radiating surface 52 of the CPU 51 by the urging of the contact spring 75.

  In a state where the water cooling jacket 60 is attached to the base member 80, the heat generated by the CPU 51 is transmitted to the cooling water in the water channel 67 through the heat receiving plate 65. And since the cooling water which took the heat flows out of the water cooling jacket 60, and the low-temperature cooling water flows into the water cooling jacket 60, the CPU 51 is effectively cooled.

  When the cooling of the CPU 51 is temporarily interrupted for maintenance or replacement of the circuit board 50, the water cooling jacket 60 is removed from the base member 80. At this time, a finger is put on the operation portion 86, and the locking member 84 is slid in a direction in which the locking projection 85 is detached from the locking plate 73 against the urging force of the locking spring 87. When the locking projection 85 is disengaged from the locking plate 73, the locking plate 73 and the pressing plate 74 are displaced upward relative to the water cooling jacket 60 by the biasing of the contact spring 75. Thereafter, the water cooling jacket 60 may be lifted.

  In the heat sink B of the second embodiment, when the water cooling jacket 60 is attached to the base member 80 and the heat receiving plate 65 is brought into contact with the CPU 51 by the holding means 70, the heat generated from the CPU 51 is the heat receiving path that forms the heat transfer path 79. Directly transmitted to the plate 65 and transmitted to the cooling water in the water cooling jacket 60. Since the heat receiving plate 65 is brought into direct contact with the CPU 51, the cooling efficiency is better than when a gap is interposed between the heat receiving plate 65 and the CPU 51. Thus, according to the present embodiment, it is possible to improve the cooling efficiency without deteriorating the detachability workability of the water cooling jacket 60.

  Further, the holding means 70 is configured to include a contact spring 75 that urges the heat receiving plate 65 in the direction in which the heat receiving plate 65 contacts the CPU 51, and therefore absorbs thermal expansion and dimensional tolerance of each member to The CPU 51 can be surely brought into contact. In addition, since the air cooling fins 69 are provided, even if the cooling function by the cooling water is disturbed, a significant decrease in the cooling function can be avoided.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In Embodiment 1 described above, the heat receiving portion is provided only on the base member, but the heat receiving portion may be provided on both the base member and the water cooling jacket.
(2) In Embodiment 2 described above, the heat receiving portion is provided only in the water cooling jacket, but the heat receiving portion may be provided in both the water cooling jacket and the base member.
(3) In the first embodiment, the dual-purpose spring urges the locking member in the locking direction to hold the water-cooling jacket in the mounted state, and brings the water-cooling jacket into contact with the heat receiving portion to increase the cooling efficiency. Although both functions are combined, these two functions may be exhibited by separate springs.
(4) In the first embodiment, the axis of the plug to which the hose is connected is oriented substantially parallel to the attaching / detaching direction of the water cooling jacket. However, the axis of the plug may be oriented in a direction intersecting the attaching / detaching direction of the water cooling jacket. Good. In this case, the axis line of the plug may be either a direction parallel to the plate surface of the heat receiving unit or a direction intersecting the plate surface of the heat receiving unit.
(5) In Embodiment 2 above, the axis of the plug to which the hose is connected is oriented substantially parallel to the direction of attaching and detaching the water cooling jacket, but the axis of the plug may be oriented in a direction that intersects with the direction of attaching and detaching the water cooling jacket. Good.
(6) In the first and second embodiments, the axes of the two connecting portions are parallel to each other, but the axes of the two connecting portions may be in different directions.
(7) In the said Embodiment 1, you may provide the fin for air cooling in a base member or a water cooling jacket.
(8) In the second embodiment, the air cooling fins may not be provided in the water cooling jacket, or the air cooling fins may be provided in both the water cooling jacket and the base member.
(9) The form of the water channel of the first embodiment can also be applied to the second embodiment, and the form of the water channel of the second embodiment can also be applied to the first embodiment.

A ... Heat sink 10 ... Water cooling jacket 16 ... Heat transfer plate (Heat transfer path)
17 ... Water channel 30 ... Base member 35 ... Heat receiving plate (heat receiving portion)
DESCRIPTION OF SYMBOLS 40 ... Locking member 45 ... Holding means 44 ... Combined spring 48 ... Contact spring 49 ... Heat transfer path B ... Heat sink 60 ... Water cooling jacket 65 ... Heat receiving plate (heat receiving part)
67 ... Water channel 69 ... Fin 70 ... Holding means 75 ... Abutting spring 79 ... Heat transfer path 80 ... Base member

Claims (4)

A water cooling jacket having a cooling water channel;
A base member provided in the vicinity of the heat generating member and capable of attaching and detaching the water cooling jacket;
A heat receiving part that constitutes a heat transfer path for transferring heat received from the heat generating member to the cooling water in the water channel;
A heat sink, comprising: holding means for holding the heat receiving portion in contact with the heat generating member.   The heat sink according to claim 1, wherein the holding unit includes a contact spring that urges the heat receiving portion in a direction to contact the heat generating member. The heat receiving portion is provided on the base member;
The base member is
A locking member that is displaceable between a locking state that locks the water cooling jacket and holds the water cooling jacket in a mounted state, and a release state that releases the locking to the water cooling jacket;
A dual-purpose spring that biases the locking member in the locking direction and biases the water-cooling jacket in a direction to contact the heat receiving portion via the locking member. The heat sink according to claim 1 or 2.   The heat sink according to any one of claims 1 to 3, further comprising air-cooling fins.

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