JP2008103400A - Watercooled heat sink and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a watercooled heat sink that has components easily press-formed, restrains facility cost increace, can be manufactured with the same components, and has various kinds of capacity, and also to provide a manufacturing method of the watercooled heat sink. <P>SOLUTION: A first plate 1 having a pair of communicating holes 5 at both the ends in the longitudinal direction, and a second plate 2 that communicates with respective communicating holes 5 and is formed in a frame, are laminated alternately; an end plate 3 is arranged at both the edge positions in the lamination direction for composing a core 4; inlet and outlet ports 6 of cooling water are connected to the communicating holes 5; and the surface of the core 4 is set to be a mount surface 7a of a heat receiving plate 7. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a water-cooled heat sink for efficiently cooling a power module, a microprocessing unit (MPU), etc., which are electronic components having a large amount of heat generation.

Conventionally, in order to cool the MPU and power module of a computer, an air-cooled heat sink is generally used, and a water-cooled heat sink is used for a power module having a larger heat dissipation.
The present applicant has already proposed a water-cooled heat sink disclosed in the following patent document.

JP-A-2005-123260

In the water-cooled heat sink described in Patent Document 1, an inner fin is disposed inside a flat casing, cooling water is circulated inside the casing, and an electronic component is joined to the outer surface of the casing via a heat receiving plate. It was.
Such a water-cooled heat sink requires the casing and inner fins to be designed according to the specifications of the electronic components and other specifications, and the production equipment is too expensive when providing heat sinks for high-mix low-volume production. was there.
Accordingly, the present invention aims to provide a water-cooled heat sink and a method of manufacturing the same, which can simplify parts of the heat sink, reduce the cost of molds for forming the parts, and can easily manufacture parts having various capacities using the parts as common parts. And

In the first aspect of the present invention, a large number of first plates (1) and second plates (2) made up of elongated flat plate-shaped press-formed bodies whose outer peripheries are aligned are alternately stacked in the stacking direction. A pair of end plates (3) are arranged at both ends, and the cores (4) are formed by brazing and fixing the plates together.
The first plate (1) has a pair of communication holes (5) at both longitudinal ends thereof.
The second plate (2) is formed in a frame shape communicating with the pair of communication holes (5),
A pair of cooling water inlet / outlet (6) provided in the end plate (3) communicates with the communication hole (5),
A water-cooled heat sink in which the surface of the core (4) formed as an aggregate of the four peripheral edges of each plate serves as the mounting surface (7a) of the heat receiving plate (7).

The present invention according to claim 2 is the method according to claim 1,
The first plate (1) has a corrugated portion (15) bent in a corrugated shape except for the peripheral edge in the width direction between the pair of communication holes (5), and the corrugated portion (15) has a thickness direction. This is a water-cooled heat sink in which the protruding amount t is less than half the thickness S of the second plate (2).
The present invention described in claim 3 provides the method according to claim 2,
The ridge lines of the corrugated portion (15) of the first plate (1) are inclined with respect to the width direction, and the corrugated portions of the first plates (1) facing each other through the second plate (2) ( The ridge lines of 15) are water-cooled heat sinks arranged so as to cross each other.

According to the present invention, the outer peripheries of the first and second plates (1) and (2), each of which is formed of an elongated flat plate-shaped press-molded body, are alternately laminated. A pair of end plates (3) are arranged at both ends in the direction, and the cores (4) are formed by brazing and fixing the plates together.
The first plate (1) has a pair of communication holes (5) at both ends in the longitudinal direction, and a plurality of first intermediate holes (8) are arranged apart from each other between the communication holes (5). ,
The second plate (2) has a pair of end holes (9) whose both ends communicate with both communication holes (5) of the first plate (1), and between the both end holes (9). A plurality of second intermediate holes (10) are spaced apart from each other;
The first intermediate hole (8) and the second intermediate hole (10) communicate with each other at a part of the opening,
A pair of cooling water inlets and outlets (6) provided in the end plate (3) are communicated with the communication hole (5),
A water-cooled heat sink in which a mounting surface (7a) of a heat receiving plate (7) is disposed on the surface of the core (4).

The present invention according to claim 5 is the invention according to claim 4,
The communication hole (5), the end hole (9), the first intermediate hole (8), and the second intermediate hole (10) are water-cooled heat sinks formed in a quadrilateral shape.
The present invention described in claim 6 provides the method according to claim 5,
The first intermediate hole (8) and the second intermediate hole (10) are formed in a parallelogram, and the inclination of each side located in the width direction is determined by the first intermediate hole (8) and the second intermediate hole. It is a water-cooled heat sink that is opposite in (10).

A seventh aspect of the present invention provides the method according to any one of the first to sixth aspects,
Instead of the one or more first plates (1) located in the middle of the stacking direction, a partition plate (11) having a structure in which one communication hole (5) of the first plate (1) is closed is disposed. This is a water-cooled heat sink in which the cooling water in the core (4) flows through multiple paths.
The present invention according to claim 8 provides the method according to any one of claims 1 to 7,
The water-cooled heat sink is configured such that a positioning projection (16) is provided on end faces in the width direction of at least a pair of the plates spaced apart from each other, and a heat receiving plate (7) is adjacent to the projection.

The present invention according to claim 9 is a method of manufacturing a heat sink according to claims 1 to 8,
A step of stamping the first plate (1), the second plate (2) and the end plate (3) by a press machine, a step of assembling the core (4), and an assembled core ( And 4) a step of integrally brazing between the contact portions of the parts.

  In the first water-cooled heat sink of the present invention, the second plate 2 is formed in a frame shape, and the inside thereof is communicated with the pair of communication holes 5 of the first plate 1. Since the cooling water flow path is formed and the first plate 1 constitutes the heat transfer fin, the heat radiation area on the water channel side is increased by the large number of first plates, and heat exchange can be promoted. Since the mounting surface 7a of the heat receiving plate 7 on the surface of the core 4 uses the outer surface of the core made of a laminated body at the periphery of each plate, a large number of cooling water flow paths are adjacent to each part of the mounting surface 7a. Thus, each part of the mounting surface 7a can be uniformly and efficiently cooled. A high-performance water-cooled heat sink with a narrow gap between the fins can be easily and inexpensively manufactured.

In the above configuration, when the pair of communication holes 5 of the first plate 1 are bent in a waveform, the cooling water flow path formed in the second plate 2 is corrugated to stir the cooling water, and heat exchange performance Can be further improved.
In the above configuration, the ridgeline of the wave of the first plate 1 is inclined with respect to the width direction, and the ridgelines facing each other are arranged so as to intersect each other, and the cooling water is further efficiently stirred, and the heat exchange performance is improved. It can be further improved.

In the second water-cooled heat sink of the present invention, a plurality of first intermediate holes 8 and second intermediate holes 10 are provided in the first plate 1 and the second plate 2, respectively, so that they communicate with each other at a part of the openings. Therefore, the cooling water can move in a meandering manner through the first intermediate hole 8 of the first plate 1 and the second intermediate hole 10 of the second plate 2. Thereby, the cooling water can be further stirred and heat exchange can be promoted.
In the above configuration, in the case where the communication hole 5, the end hole 9, the first intermediate hole 8, and the second intermediate hole 10 are formed in a quadrilateral shape, the peripheral length of these openings is made longer, The agitation effect of cooling water can be improved and heat exchange can be promoted.

In the above configuration, the first intermediate hole 8 and the second intermediate hole 10 are parallelograms, and the inclination of the side located in the width direction is reversed between the first intermediate hole 8 and the second intermediate hole 10. Can further increase the stirring effect of cooling water and further promote heat exchange.
In any of the above-described configurations, in the case where the partition plate 11 is positioned in the middle of the stacking direction instead of the first plate 1 and the cooling water is circulated in the core through multiple passes, the cooling water flow path is made longer. Therefore, it is possible to provide a water-cooled heat sink that is efficient with a small flow rate and has a large heat transfer area.
In any of the above-described configurations, in the case where the projections 16 for positioning the pair of plates are provided, the heat receiving plate 7 can be positioned accurately and quickly.

  The manufacturing method of the water-cooled heat sink of the present invention includes a step of stamping and forming the first plate 1, the second plate 2 and the end plate 3 with a press machine, a step of assembling the core 4, and a step of assembling the core 4. It is possible to provide a water-cooled heat sink that is easy to manufacture and inexpensive. That is, since the component parts of the heat sink of the present invention are formed of a punching material, a press die can be easily manufactured, equipment cost can be reduced, and a water-cooled heat sink can be provided at low cost.

Further, by changing the number of stacked first plates 1 and 2, heat sinks of various capacities can be provided.
Furthermore, heat sinks of various specifications can be provided by changing the plate thickness of the first plate 1 and the second plate 2. At the same time, the pitch of the channel and the fin can be easily changed. Thereby, a variety of heat sinks can be provided with the same press mold.

Next, embodiments of the present invention will be described with reference to the drawings.
1 is an exploded perspective view of a water-cooled heat sink according to the present invention, FIG. 2 is a perspective view showing an assembled state thereof, FIG. 3 is a cross-sectional view taken along the line III-III in FIG. The state which has arrange | positioned the heat-receiving board 7 and the electronic component 13 to the surface 7a is shown.
As shown in FIG. 1, the water-cooled heat sink has a first plate 1, a second plate 2, an end plate 3, and an inlet / outlet pipe 12. The first plate 1, the second plate 2, and the end plate 3 are each formed of an elongated flat plate-shaped metal rectangular plate whose outer periphery is stamped and formed with a press machine in the same shape.

  The first plate 1 is formed with a pair of rectangular communication holes 5 at both longitudinal ends thereof. The second plate 2 is formed in a frame shape punched except for the four peripheral portions, and the frame width at the short side of the frame is equal to the width of the hole edge on the short side of the communication hole 5. At the same time, the frame width on the long side of the second plate 2 is also equal to the width of the long side of the first plate 1 and the hole edge of the communication hole 5. A large number of such first plates 1 and second plates 2 are alternately stacked, and end plates 3 are disposed at both end positions in the stacking direction.

  One end plate 3 is formed in a flat plate shape having no holes, and the other end plate 3 has a pair of entrances 6. The first plate 1, the second plate 2, and the end plate 3 are each made of, for example, an aluminum brazing sheet material, and are fastened by a jig in a stacked state. With one end disposed, the heat sink shown in FIG. 2 is completed by brazing and fixing integrally in a furnace. An attachment surface 7a is formed on the outer peripheral surface of the core 4 made of a laminate of the first plate 1, the second plate 2, and the end plate 3. The heat receiving plate 7 is joined to the mounting surface 7a by means such as brazing.

  Furthermore, the electronic component 13 shown in FIG. 4 is joined to the heat receiving plate 7. Then, as shown in FIG. 3, the cooling water 14 flows from one of the inlet / outlet pipes 12 and flows from one of the longitudinal directions of the second plate 2 to the other through the communication holes 5 of the first plate 1. Let it flow out of the inlet / outlet pipe 12. At this time, the second plate 2 forms a flow path for the cooling water 14, and the first plate 1 forms heat transfer fins. And each part of the outer peripheral surface of the core 4 is cooled uniformly, and the electronic component 13 attached thereto is efficiently cooled via the heat receiving plate 7.

  Next, FIG. 5 is a perspective view of a principal part showing a modification of the above embodiment, and this example is different from that of FIG. 4 in that one edge of the long side of the first plate 1 or the second plate 2 is used. Convex part 16 is projected from the part. At least a pair of convex portions 16 are provided in the first plate 1 or the second plate 2 at different positions, thereby positioning the heat receiving plate 7. That is, the edge portion of the heat receiving plate 7 can be brought into contact with the wall surface of the convex portion 16 and can be joined at an accurate position.

  Next, FIG. 6 shows a second embodiment of the present invention, and this example is different from that of FIG. 3 only in the position of the inlet / outlet of the cooling water 14. In FIG. 3, the cooling water 14 circulates in a U-shape as a whole, whereas in the case of FIG. 6, it circulates in a bowl shape. For this purpose, one end plate 3 is provided with an entrance / exit 6 at one end in the longitudinal direction, and the other end plate 3 is provided with an entrance / exit 6 on the other side in the longitudinal direction, and an entrance / exit pipe 12 is joined thereto. It is.

  Next, FIG. 7 shows a third embodiment of the present invention. In this example, a partition plate 11 is disposed at an intermediate position in the stacking direction of the cores 4. The partition plate 11 has a shape in which the communication hole 5 on one side of the first plate 1 is closed. In addition, in order to illustrate the partition plate 11 in an easy-to-understand manner, the hatch line of the cross section is displayed thickly. In addition, an entrance / exit 6 is provided on each side in the longitudinal direction of the pair of end plates 3, and an entrance / exit pipe 12 is joined to the entrance / exit 6. Then, the cooling water 14 flows from one of the inlet / outlet pipes 12, and the cooling water 14 flows in a U-shape as a whole with the partition plate 11 as a boundary. By doing so, the flow path length of the cooling water 14 can be increased, and the heat exchange performance can be improved with a small flow path.

Further, FIG. 8 shows a fourth embodiment of the present invention. In this example, a pair of partition plates 11 are arranged at two positions in the middle in the stacking direction so as to be separated from each other. One partition plate 11 has a communication hole at one end in the longitudinal direction, and the other partition plate 11 has a communication hole at the other. As a result, the cooling water 14 circulates in a meandering manner across the partition plates 11.
The shape of each partition plate 11 is the same as that in FIG. Further, in this example, there are two partition plates 11, but it may be three or more.

  Next, FIGS. 9 to 11 show another embodiment of the first plate 1 and the second plate 2 constituting the heat sink of the present invention, FIG. 9 is an exploded perspective view thereof, and FIG. The side view which shows the state which piled up 2 plates 2, FIG. 11: is XI-XI arrow sectional drawing in FIG. This example differs from that of FIG. 1 in that a large number of first intermediate holes 8 are arranged at regular intervals between a pair of communication holes 5 in the first plate 1, and ends at both longitudinal ends of the second plate 2. The part holes 9 are arranged, and a plurality of second intermediate holes 10 are arranged at regular intervals between the both end part holes 9. The pair of communication holes 5 and the end hole 9 in the first plate 1 communicate with each other.

  The first plate 1 and the second plate 2 are stacked alternately in the same manner as in FIG. 1, and end plates 3 are disposed at both ends thereof. In the overlapping state of the first plate 1 and the second plate 2, the communication hole 5 and the end hole 9 communicate with each other. Further, the first intermediate hole 8 of the first plate 1 and a part of the second intermediate hole 10 of the second plate 2 communicate with each other. Then, the cooling water 14 flows from the communication hole 5 of the first plate 1 into the end hole 9 of the second plate 2 and circulates between the first plate 1 and the second plate 2 in a meandering manner as shown in FIG. . In this figure, the cooling water 14 reaching the right end is led to the outside from the communication hole 5. In this example, the communication hole 5, the first intermediate hole 8, the end hole 9, and the second intermediate hole 10 are each opened in a square shape.

  Next, FIGS. 12 to 14 show a first plate 1 and a second plate 2 showing still another example of the present invention, FIG. 12 is an exploded perspective view thereof, and FIG. 13 shows the first plate 1 and the second plate 2. FIG. 14 is a cross-sectional view taken along arrow XIV-XIV in FIG. 13. This example is different from that of FIG. 10 in that the openings of the communication hole 5, the first intermediate hole 8, the end hole 9, and the second intermediate hole 10 are formed in a trapezoidal shape or a parallelogram, the first plate The only difference is that the inclination of the oblique side of the first first intermediate hole 8 and the inclination of the oblique side of the second plate 2 are reversed. Also in this example, the cooling water 14 circulates in a meandering manner through the openings of the first plate 1 and the second plate 2 as shown in FIG.

  Next, FIG. 15 is a perspective view of still another embodiment of the present invention, and FIG. 16 is a plan view of the first plate 1. This example is different from that of FIG. 1 only in the corrugated portion 15 of the first plate 1. In the first plate 1, the corrugated portion 15 is bent between the pair of communication holes 5 except for the peripheral portion thereof. The ridge lines of the corrugated portion 15 are formed obliquely. By turning the first plate 1 upside down, the ridgelines of the corrugated portions 15 facing each other are opposite to each other in the width direction as shown in the figure. Therefore, a large number of the first plates 1 and the second plates 2 are stacked so that the ridge lines of the corrugated portions 15 of the first plate 1 facing each other through the second plate 2 are opposite to each other.

  1, a pair of end plates 3 are arranged at both ends in the stacking direction, and an inlet / outlet pipe 12 is arranged at the inlet / outlet 6 of the end plate 3, and the parts are integrally brazed and fixed to form a water-cooled heat sink. . In this example, as shown in FIGS. 15 and 16, the protruding amount t of the corrugated portion 15 of the first plate 1 is formed to be ½ of the thickness S of the second plate 2. Thereby, the ridge lines of the corrugated portions 15 of the adjacent first plates 1 come into contact with each other. Then, as shown in FIG. 17, the ridgelines of the corrugated portions 15 intersect, and the cooling water flowing into the second plate 2 from one communication hole 5 circulates in a meandering manner by the corrugated portions 15 of the respective water channels. However, heat exchange is promoted by an increase in the heat transfer area and a stirring effect. The protruding amount t of the corrugated portion 15 may be equal to or less than ½ of the thickness S of the second plate 2.

  Next, FIG. 18 shows another example of the corrugated portion 15 provided on the first plate 1. In this example, the corrugated portion 15 of one first plate 1 is the same as that of the other through the second plate 2. The two are synchronized. In this example, the cooling water flowing in the second plate 2 meanders in a waveform by the waveform unit 15.

The disassembled perspective view which shows 1st Embodiment of the water cooling heat sink of this invention. The perspective view which shows the assembly state of the heat sink. III-III arrow sectional drawing in FIG. It is a front view of the heat sink, and shows a state where the heat receiving plate 7 and the electronic component 13 are arranged. The principal part perspective view which shows the other example of the heat sink. It is sectional drawing which shows the other example of the heat sink of this invention, Comprising: It corresponds to FIG.

It is sectional drawing which shows the other example of the heat sink of this invention, Comprising: It corresponds to FIG. FIG. 6 is a cross-sectional view of still another embodiment of the heat sink according to the present invention, corresponding to FIG. 3. The disassembled perspective view which shows the other example of the 1st plate 1 of the heat sink of this invention, and the 2nd plate 2. FIG. The side view which shows the overlapping state of the heat sink. XI-XI arrow sectional drawing of FIG. The disassembled perspective view which shows the further another example of the 1st plate 1 of the heat sink of this invention, and the 2nd plate 2. FIG.

The side view which shows the overlapping state of the heat sink. FIG. 14 is a cross-sectional view taken along arrow XIV-XIV in FIG. 13. The principal part disassembled perspective view which shows the further another example of the heat sink of this invention. The top view of the 1st plate 1 of the heat sink. Explanatory drawing which shows the state which laminated | stacked the pair of 1st plate 1 of the heat sink via the 2nd plate 2. FIG. The principal part sectional drawing which shows the further another example of the 1st plate 1 of the heat sink of this invention. The side view which shows the overlapping state of the heat sink.

DESCRIPTION OF SYMBOLS 1 1st plate 2 2nd plate 3 End plate 4 Core 5 Communication hole 6 Entrance / exit 7 Heat receiving plate
7a Mounting surface 8 First intermediate hole

9 End hole
10 Second intermediate hole
11 Partition plate
12 Entrance pipe
13 Electronic components
14 Cooling water
15 Waveform part
16 Convex

Claims (9)

A large number of first plates (1) and second plates (2) made of elongated flat plate-shaped press-formed bodies whose outer peripheries are aligned are alternately stacked, and a pair of end plates (3) are provided at both ends in the stacking direction. Arranged and brazed together between the plates to form the core (4),
The first plate (1) has a pair of communication holes (5) at both longitudinal ends thereof.
The second plate (2) is formed in a frame shape communicating with the pair of communication holes (5),
A pair of cooling water inlet / outlet (6) provided in the end plate (3) communicates with the communication hole (5),
A water-cooled heat sink in which the surface of the core (4) formed as an assembly of four peripheral edges of each plate serves as the mounting surface (7a) of the heat receiving plate (7). In claim 1,
The first plate (1) has a corrugated portion (15) bent in a corrugated shape except for the peripheral edge in the width direction between the pair of communication holes (5), and the corrugated portion (15) has a thickness direction. A water-cooled heat sink in which the projection amount t of the second plate (2) is less than half the thickness S of the second plate (2). In claim 2,
The ridge lines of the corrugated portion (15) of the first plate (1) are inclined with respect to the width direction, and the corrugated portions of the first plates (1) facing each other through the second plate (2) ( 15) Water-cooled heat sinks arranged so that the ridgelines cross each other. A plurality of first plates (1) and second plates (2) made of an elongated flat plate-shaped press-molded body are alternately stacked while the outer peripheries thereof are aligned, and a pair of end plates (3 ) Are arranged, and the plates are integrally brazed and fixed to form the core (4),
The first plate (1) has a pair of communication holes (5) at both ends in the longitudinal direction, and a plurality of first intermediate holes (8) are arranged apart from each other between the communication holes (5). ,
The second plate (2) has a pair of end holes (9) whose both ends communicate with both communication holes (5) of the first plate (1), and between the both end holes (9). A plurality of second intermediate holes (10) are spaced apart from each other;
The first intermediate hole (8) and the second intermediate hole (10) communicate with each other at a part of the opening,
A pair of cooling water inlets and outlets (6) provided in the end plate (3) are communicated with the communication hole (5),
A water-cooled heat sink in which a mounting surface (7a) of a heat receiving plate (7) is disposed on the surface of the core (4). In claim 4,
A water-cooled heat sink in which the communication hole (5), the end hole (9), the first intermediate hole (8), and the second intermediate hole (10) are formed in a quadrilateral shape. In claim 5,
The first intermediate hole (8) and the second intermediate hole (10) are formed in a parallelogram shape, and the inclination of each side located in the width direction of the plate is changed between the first intermediate hole (8) and the second intermediate hole (8). Water-cooled heat sink that is opposite to the middle hole (10). In any one of Claims 1-6,
Instead of the one or more first plates (1) located in the middle of the stacking direction, a partition plate (11) having a structure in which one communication hole (5) of the first plate (1) is closed is disposed. A water-cooled heat sink in which the cooling water in the core (4) circulates in multiple paths. In any one of Claims 1-7,
A water-cooled heat sink in which positioning convex portions (16) are provided on end faces in the width direction of at least a pair of the plates spaced apart from each other, and a heat receiving plate (7) is adjacent to the convex portions. In the method of manufacturing the heat sink according to claim 1,
A step of stamping the first plate (1), the second plate (2) and the end plate (3) by a press machine, a step of assembling the core (4), and an assembled core ( And 4) a step of integrally brazing the contact portions of the components.

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