JP5341549B2 - heatsink - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat sink constituted by stacking porous flat plate-shaped plates, improving reliability of its seal section, easily manufacturable, and reducing use materials. <P>SOLUTION: A core 4 composed of a laminated body of porous flat plate-shaped first plate 1 and second plate 2, is integrally brazed and fixed between a first casing member 7a and a second casing member 7b at least one of which is recessed and formed into the dish shape, and has a pair of tank sections 10a. Further, peripheral edges of the first casing member 7a and the second casing member 7b are liquid-tightly brazed and bonded. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a heat sink in which a core is formed by stacking flat perforated plates.

The present applicant has already proposed the invention of the following patent document.
The core of this heat sink has a frame part on the outer periphery, and except for both ends in the longitudinal direction of the frame part, a large number of slits are formed obliquely from each frame part to form a core plate. The slits of the overlapping and adjacent core plates are arranged so as to intersect each other. Then, lid plates are arranged at both the upper and lower ends in the stacking direction, and the plates in contact with each other are integrally brazed and fixed.

JP 2007-327732 A

The core of the heat sink described in Patent Document 1 has a simple structure, but there are a large number of seal portions, which may cause liquid leakage. Further, it is necessary to provide a tank portion on each plate itself, which makes the structure of the mold complicated and disadvantageous in that many materials are required.
Then, this invention makes it a subject to solve the fault which concerns.

The present invention according to claim 1 is composed of a laminate of a flat plate-like first plate (1) and a second plate (2) each formed by punching a metal plate and adjacent to each other. A core (4) in which the holes (1c) and (2c) of both plates (1) and (2) are displaced in a plane,
A first casing member (7a) and a second casing member (7b) that are fixed in a liquid-tight manner with their outer circumferences aligned and at least one of which is recessed and formed in a dish shape and has a pair of tank portions (10a). A casing (7) in which the core (4) contacts and is housed in both casing members (7a) and (7b) except for both tank portions (10a) and (10a),
The plates (1) and (2) constituting the core (4) are integrally brazed, and the core (4) and the casing (7) are brazed and fixed integrally. And
The coolant (11) is supplied to the inside of the casing (7) through the tank portion (10a), and the holes (1c) (2c) of the plates (1) (2) of the core (4). While circulating inside, an element (12) for cooling is attached to the outer surface of the casing (7) ,
The element (12) to be cooled is fixed to the outer surface of the casing (7), and the core (4) is disposed directly below the element (12) through the casing (7),
Each of the plates (1) and (2) of the core (4) is arranged in parallel with each other in a direction perpendicular to the flow direction of the cooling liquid (11), and a plurality of elongate plates respectively positioned in the flow direction of the cooling liquid. The longitudinal members (1a) and (2a) and the oblique members (1b) and (2b) that obliquely connect the adjacent longitudinal members are integrally formed,
Each plate (1) (2) has its vertical members (1a) (2a) aligned and completely overlapped, thereby forming a wall in which the vertical members (1a) (2a) are continuous in the stacking direction. And both end surfaces in the stacking direction of the walls are joined to both casing members (7a) and (7b),
The respective slant members (1b) and (2b) of the plates (1) and (2) are arranged apart from each other in the flow direction, and their orientations are arranged symmetrically or asymmetrically opposite to each other. It is the heat sink characterized .

The present invention according to claim 2 is the method according to claim 1,
A pair of inlets and outlets (9) of the coolant (11) are opened at one end and the other end of the casing (7), and the plurality of cores (4) are intermittently arranged between the pair of inlets and outlets (9). And at the position of the space (13) between the adjacent cores, the casing (7) is formed with convex portions (14) made of dimples or beats protruding to the inner surface side, and each core ( 4) The heat sink is positioned at the end.

The present invention described in claim 3 provides the method according to claim 2,
A part of the casing (7) has a trapezoidal part (15) protruding in a stepped manner on the inner surface side, and a core (4) thinner than the others is contacted and fixed to the trapezoidal part (15), and the outer surface thereof This is a heat sink in which an element to be cooled (12) that generates less heat than the others is fixed on the side.
The present invention according to claim 4 provides the method according to claim 1,
The casing (7) is a heat sink in which the plane is circular and the plane of the core (4) is circular.

The present invention described in claim 5 provides the method according to claim 1,
A pin hole (16) and a pin (17) are formed in the longitudinal members (1a) and (2a) of the first plate (1) and the second plate (2) of the core (4), and the pins A pin (17) is inserted into the hole (16), and the heat sink is positioned between the plates (1) and (2).
The present invention described in claim 6 provides the method according to claim 1,
Except for the end plate in the stacking direction, notches (18) are formed on the side surfaces of the vertical members (1a) and (2a) of the plates (1) and (2), and the end plate in the stacking direction is formed. A part of the vertical member located at the corner of the plate is bent, and the bent portion (19) is a heat sink fitted into the notched portion (18) of each plate.

  The heat sink of the present invention is composed of a laminated body of a flat plate-like first plate 1 and second plate 2 having a core 4 formed in a porous shape, and is housed in a casing 7 having a pair of tank portions 10a. Since it is fixed by brazing together, the leakage portion of the cooling water in the heat sink is extremely small and highly reliable. At the same time, it is possible to provide a heat sink that has a simple configuration, is easy to manufacture, and is low cost. Furthermore, it is not necessary to form a tank part in the core 4 itself, and the amount of materials used can be reduced accordingly.

Furthermore, since the core 4 is disposed immediately below the element 12 to be cooled fixed to the outer surface of the casing 7, the cooling performance of the element 12 can be improved.
Further, the first plate 1 and the second plate 2 of the core 4 are integrally formed by a large number of elongated vertical members 1a and 2a and oblique members 1b and 2b connecting the vertical members,
Each plate (1) (2) has its vertical members (1a) (2a) aligned and completely overlapped, thereby forming a wall in which the vertical members (1a) (2a) are continuous in the stacking direction. And both end surfaces in the stacking direction of the walls are joined to both casing members (7a) and (7b),
Since the respective slant members (1b) and (2b) of each plate (1) and (2) are arranged apart from each other in the flow direction, and their directions are arranged symmetrically or asymmetrically opposite to each other, The coolant flowing through the flow path 6 between the vertical members is meandered in the vertical direction and is also meandered in the horizontal direction. As a result, the coolant can be spirally circulated. Thereby, cooling water can be stirred smoothly and heat exchange performance can be improved.
Further, since each vertical member (1a) (2a) forms a continuous wall in the stacking direction and is integrally joined, both end surfaces of the wall in the stacking direction are joined to both casing members (7a) (7b). In addition, the heat generated by the element to be cooled can be effectively transferred through the casing members (7a) and (7b) and the respective walls, and the heat exchange performance can be improved.
In the above configuration, as described in claim 2, the plurality of cores 4 are intermittently arranged in the casing 7, and the convex portion 14 is formed on the inner surface side of the casing 7 at the space 13 between the cores 4. When the core 4 is positioned, the rigidity of the casing 7 is improved and the pressure resistance is high. In addition, a heat sink that facilitates positioning of the plurality of cores 4 can be provided.

In the above configuration, as described in claim 3, a stepped trapezoidal portion 15 is formed on a part of the inner surface side of the core 4, and the core 4 having a thinner thickness than that of the core 4 is contacted and fixed to the outer surface side. When the element 12 to be cooled with a smaller calorific value is fixed, it becomes a heat sink that exhibits optimum cooling performance for each element.
In the above-described configuration, when the casing 7 is formed in a flat circular shape and the flat surface of the core 4 is formed in an arc shape as described in claim 4 , the heat sink is compact and easy to handle and has a good appearance.

In the above-described configuration, as described in claim 5 , pin holes 16 and 17 are formed in the longitudinal members 1a and 2a of the first plate 1 and the second plate 2 of the core 4 so as to be aligned with each other. When the pin 17 is inserted into the first plate 1, the first plate 1 and the second plate 2 can be easily and reliably positioned when the core 4 is assembled.
In the above configuration, as described in claim 6, folding a portion of the corner of the plate in the stacking direction of the edge, when fitted the bent portion 19 to the cutout portion 18 of each plate, the core 4 The first plate 1 and the second plate 2 can be easily positioned during assembly.

The disassembled perspective view of the heat sink of this invention. The cross-sectional schematic of the heat sink. The top view of the 1st plate 1 which comprises the core 4 comprised by the same heat sink. The top view of the 2nd plate 2. FIG.

The top view of the same core 4. FIG. The perspective schematic diagram of the same core 4. FIG. FIG. 3 is a longitudinal sectional explanatory view showing a flow state of the cooling liquid 11 in the heat sink. Plane explanatory drawing of the same flow state.

Explanatory drawing which showed the relationship of the reduction | decrease ratio of the flow-path cross-sectional area in each position of the diagonal members 1b and 2b of the same core 4 with%. The longitudinal cross-sectional explanatory drawing which shows 2nd Embodiment of the heat sink of this invention, and its corner | angular part perspective view. The plane schematic diagram of the core group built in the heat sink. The longitudinal cross-sectional view which shows the other example of the heat sink of this invention.

The disassembled perspective view which shows the further another example of the heat sink of this invention. The partial exploded perspective view of the core of the heat sink. The principal part perspective view of the other core 4 comprised by the heat sink of this invention. The disassembled perspective view which shows the further another example of the heat sink of this invention.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of a heat sink in which a pair of cores 4 are housed, and FIG. 2 is a transverse sectional view thereof.
3 is a plan view of the first plate 1 constituting the core 4 of the present invention, FIG. 4 is a plan view of the second plate 2, FIG. 5 is a plan view of the core 4 in which both plates 1 and 2 are laminated, and FIG. Is a perspective view thereof.
The core 4 is formed by alternately laminating the first plate 1 and the second plate 2. The first plate 1 and the second plate 2 are formed by punching a metal plate such as aluminum, and a large number of straight vertical members 1a and 2a are arranged in parallel at regular intervals in the width direction. Has been. The adjacent vertical members 1a and 2a are integrally connected to each other diagonally by the diagonal members 1b and 2b.

When the first plate 1 and the second plate 2 are laminated, the vertical member 1a of the first plate 1 and the vertical member 2a of the second plate 2 are aligned and overlapped as shown in FIG. The oblique member 1b and the oblique member 2b of the second plate 2 are spaced apart from each other in the longitudinal direction, and the direction θ of the oblique member 1b of the first plate 1 and the oblique member 2b of the second plate 2 are arranged. The direction −θ is formed symmetrically in the reverse direction.
The position of the oblique member 2b of the second plate 2 exists in the middle of the oblique member 1b adjacent in the longitudinal direction of the first plate 1.

  The core 4 in which the first plate 1 and the second plate 2 are laminated in this manner is housed in the casing 7 as shown in FIGS. 1 and 2. In this example, the casing 7 includes a dish-shaped first casing member 7a and a plate-shaped second casing member 7b. The first casing member 7a has an outer periphery and an intermediate portion raised, a pair of groove portions 10 are formed between them, and the ends of the pair of groove portions 10 communicate with each other, and a pair of tank portions common to both cores 4 there. 10a is provided. The second casing member 7b is formed with coolant inlets 9 at both longitudinal ends thereof, and communicates with the tank portion 10a. In the above embodiment, the second casing member 7b may be formed in a dish shape.

As for the core 4, the upper and lower surfaces which are the lamination directions contact the 1st casing member 7a and the 2nd casing member 7b, and the whole is integrally brazed and fixed. That is, between the first plate 1 and the second plate 2 and between them and the inner surface of the casing 7 are integrally brazed and fixed. Then, the coolant is introduced into one of the inlets and outlets 9 of the casing 7, and flows through the pair of cores 4 and flows out of the other inlet / outlet 9.
An element 12 for cooling such as a power module is attached to the outer surface of the casing 7, and the generated heat is absorbed by the coolant via the core 4. At this time, the coolant flows in the longitudinal direction in FIG. The cooling liquid 11 flows through the flow path 6 between the adjacent vertical members 1a and 2a of the first plate 1 and the second plate 2.

The state of circulation of the coolant 11 is shown in FIGS. FIG. 7 is a longitudinal sectional view of the main part, and FIG. 8 is a plan view of the main part.
In FIG. 8, the coolant 11 flowing between the adjacent vertical members 1a and 2a meanders in the vertical direction as shown in FIG. In this way, it also meanders in the plane direction. This is because the oblique members 1b and 2b are arranged obliquely in reverse symmetry or asymmetric with respect to the flow path 6. As a result, the cooling liquid 11 meanders in a plane and meanders in the vertical direction, and as a result, it circulates in the flow path 6 in a spiral shape.
At this time, the cross-sectional area of the flow path 6 gradually decreases from the upstream side to the intermediate portion and gradually increases from the intermediate portion to the downstream side at the positions of the oblique members 1b and 2b.

  When this is expressed with respect to the diagonally symmetrical member arrangement along the flow path, it is as shown in FIG. In the figure, m is a plan view of the main part of the core 4, and n is a change in flow channel cross-sectional area expressed in%. This represents a change in the cross section of each flow path at the location where the cross section of the flow path 6 at a position where the oblique members 1b and 2b do not exist is 100%. As is clear from the figure, in the slant members 1b and 2b, the cross section of the flow path gradually decreases to the downstream side and gradually increases after becoming constant in the middle. This avoids a sudden increase / decrease in the flow path 6 and increases the stirring effect while minimizing the pressure loss associated with the circulation of the coolant 11 by gradually decreasing and increasing gradually.

  In the first embodiment, the first plate 1 and the second plate 2 are alternately stacked. Instead, a spacer (not shown) is interposed between the first plate 1 and the second plate 2. You may disguise. In that case, the spacer is interposed only at the position of the vertical member 1a of the first plate 1 and the vertical member 2a of the second plate 2, and they are integrally brazed and fixed. Due to the presence of the spacer, the flow path resistance accompanying the circulation of the coolant 11 can be further reduced.

  Next, FIG. 10 (A) is a longitudinal sectional view of a heat sink showing a second embodiment of the present invention, and FIG. 11 is a plan view of a core built in the heat sink. In this example, the cores 4 having a predetermined length are intermittently arranged in the series direction. As described above, by using a plurality of cores 4 as blocks having a predetermined length, a heat sink having an appropriate capacity can be easily manufactured by increasing or decreasing the number of connections.

  The second casing member 7b of the heat sink casing 7 has a trapezoidal portion 15 projecting in a stepped manner on the inner surface side in the longitudinal direction. The core 4 having a smaller thickness than the other parts is fixed on the trapezoidal portion 15 and is cooled at a position on the outer surface side of the first casing member 7a facing the trapezoidal portion 15 so as to generate a smaller amount of heat than the others. The element 12 is fixed. The thick core 4 is contacted and fixed at a position other than the trapezoidal portion 15, and the element 12 to be cooled with a large amount of heat generation is fixed at the position of the first casing member 7a facing it. With this configuration, optimal cooling can be performed according to the elements 12 of each capacity.

  Further, in this example, the outer peripheral edge of the second casing member 7b is raised, and slits 20 are formed at appropriate intervals as shown in (B), and the upper portion of the slit 20 is caulked to form the caulking portion 21. Thus, the first casing member 7a and the second casing member 7b can be positioned and fixed, and the whole can be brazed and fixed integrally in that state. Then, the cooling liquid 11 flows into the tank portion 10a from the one inlet / outlet 9, flows through each core 4 in order, and flows out from the other inlet / outlet 9. The heat generated by each element 12 is absorbed by the coolant 11.

  Next, FIG. 12 is a longitudinal sectional view of a heat sink showing a third embodiment of the present invention. In this example, a pair of inlets / outlets 9 of the coolant 11 are opened at one end and the other end of the casing 7, A plurality of cores 4 are intermittently arranged between the pair of entrances 9. A space 13 is provided between the adjacent cores 4, and at that position, the first casing member 7 a is formed with a convex portion 14 formed of a convex line projecting toward the inner surface side, and the end of each core 4 is formed on the convex portion 14. Is positioned. By comprising in this way, each core 4 can be positioned simultaneously. The structure of each core can be the same as that shown in FIGS.

Next, FIGS. 13 and 14 show a fourth embodiment of the present invention, FIG. 13 is an exploded perspective view of the heat sink, and FIG. 14 is a partially exploded schematic view of the core 4.
In the first plate 1 and the second plate 2 constituting the core 4, the longitudinal members 1a and 2a are bent into a waveform at a constant pitch in plan view. Adjacent vertical members 1a and 2a are integrally connected by oblique members 1b and 2b. Also in this example, the vertical members 1a and 2a of the first plate 1 and the second plate 2 are aligned with each other as shown in FIG. The oblique member 1b of the first plate 1 and the oblique member 2b of the second plate 2 are arranged away from each other in the flow direction of the flow path 6. In this example, since the vertical members 1a and 2a are formed in a meandering shape, the oblique members 1b and 2b are inclined with respect to the meandering flow path 6 and the oblique members 1b and 2b are inclined with respect to the meandering flow. 2b are formed in opposite directions to the meandering flow.

  Furthermore, pin holes 16 and pins 17 are formed in a plurality of positions aligned with each of the vertical members 1a and 2a of the first plate 1 and the second plate 2 of the core 4, and the pins 16 are pinned to the respective pin holes 16. The first plate 1 and the second plate 2 are positioned by inserting 17. The both sides of the core 4 on which the plates 1 and 2 are laminated are formed in a corrugated shape, and the outer peripheral surface of the first casing member 7a is formed in a corrugated shape accordingly. The core 4 is disposed between the first casing member 7a and the second casing member 7b, and the parts are integrally brazed and fixed.

  Next, FIG. 15 shows another example of the positioning of the first plate 1 and the second plate 2 of the core 4. This example is a vertical member 1 a at the four corners of the first plate 1 positioned at the uppermost stage in the stacking direction. The other first plate 1 and second plate 2 are formed with notches 18 that are aligned with each other. Then, the outer side of each slit 20 of the uppermost first plate 1 is bent to form a bent portion 19, and the bent portion 19 is inserted into the notched portion 18. Thereby, each plate can be easily positioned.

  Next, FIG. 16 is an exploded perspective view of still another example of the heat sink of the present invention. The casing 7 of this example is formed in a flat circular shape, and the core 4 inserted therein is formed in a circular arc shape. It is a thing. That is, the first casing member 7a is formed in a circular dished shape, and the second casing member 7b is a flat plate with a circular convex portion 22 projecting integrally at the center thereof. And a pair of entrance / exit 9 is provided on the diameter line on both sides of the circular convex part 22. As shown in FIG.

  The cores 4 are each formed in an arc shape so as to be substantially aligned with a position excluding the pair of entrances 9. In the core 4 of this example, the longitudinal members 1a and 2a of the first plate 1 and the second plate 2 constituting the core 4 are formed in an arc shape instead of being formed in a linear shape in FIGS. . Then, the cooling water is circulated through the pair of cores 4 in an arc from opposite one of the entrances 9 and flows out to the other entrance 9. Also in this example, the first plate 1 and the second plate 2 constituting the core 4 are integrally brazed and fixed between the contact portions of the first plate 1 and the second plate 2 and the inner surface of the casing 7, and the first casing member 7a. The flange portion provided on the outer periphery of the second casing member 7b and the outer peripheral edge of the second casing member 7b are fixed in a liquid-tight manner by brazing.

1 First plate
1a Longitudinal member
1b Diagonal member
1c hole 2 2nd plate
2a Longitudinal member
2b Diagonal member
2c hole

4 Core 6 Flow path 7 Casing
7a First casing member
7b Second casing member 9 Entrance / exit
10 Groove
10a Tank part

11 Coolant
12 elements
13 space
14 Convex
15 Trapezoid
16 pin hole
17 pin

18 Notch
19 Bending part
20 slits
21 Caulking section
22 Circular convex

Claims (6)

Each of the adjacent plates (1) and (2) consists of a laminate of a flat plate-like first plate (1) and second plate (2) formed by punching a metal plate. A core (4) in which the holes (1c) and (2c) are displaced in a plane,
A first casing member (7a) and a second casing member (7b) that are fixed in a liquid-tight manner with their outer circumferences aligned and at least one of which is recessed and formed in a dish shape and has a pair of tank portions (10a). A casing (7) in which the core (4) contacts and is housed in both casing members (7a) and (7b) except for both tank portions (10a) and (10a),
The plates (1) and (2) constituting the core (4) are integrally brazed, and the core (4) and the casing (7) are brazed and fixed integrally. And
The coolant (11) is supplied to the inside of the casing (7) through the tank portion (10a), and the holes (1c) (2c) of the plates (1) (2) of the core (4). While circulating inside, an element (12) for cooling is attached to the outer surface of the casing (7) ,
The element (12) to be cooled is fixed to the outer surface of the casing (7), and the core (4) is disposed directly below the element (12) through the casing (7),
Each of the plates (1) and (2) of the core (4) is arranged in parallel with each other in a direction perpendicular to the flow direction of the cooling liquid (11), and a plurality of elongate plates respectively positioned in the flow direction of the cooling liquid. The longitudinal members (1a) and (2a) and the oblique members (1b) and (2b) that obliquely connect the adjacent longitudinal members are integrally formed,
Each plate (1) (2) has its vertical members (1a) (2a) aligned and completely overlapped, thereby forming a wall in which the vertical members (1a) (2a) are continuous in the stacking direction. And both end surfaces in the stacking direction of the walls are joined to both casing members (7a) and (7b),
The respective slant members (1b) and (2b) of the plates (1) and (2) are arranged apart from each other in the flow direction, and their orientations are arranged symmetrically or asymmetrically opposite to each other. Features heat sink. In claim 1 ,
A pair of inlets and outlets (9) of the coolant (11) are opened at one end and the other end of the casing (7), and the plurality of cores (4) are intermittently arranged between the pair of inlets and outlets (9). And at the position of the space (13) between the adjacent cores, the casing (7) is formed with convex portions (14) made of dimples or beats protruding to the inner surface side, and each core ( 4) Heat sink with end positioned. In claim 2 ,
A part of the casing (7) has a trapezoidal part (15) protruding in a stepped manner on the inner surface side, and a core (4) thinner than the others is contacted and fixed to the trapezoidal part (15), and the outer surface thereof A heat sink to which an element (12) to be cooled that generates less heat than the other is fixed on the side. In claim 1,
A heat sink in which the casing (7) is formed in a flat circular shape, and the flat surface of the core (4) is formed in an arc shape. In claim 1 ,
A pin hole (16) and a pin (17) are formed in the longitudinal members (1a) and (2a) of the first plate (1) and the second plate (2) of the core (4), and the pins A heat sink in which the pin (17) is inserted through the hole (16) and the space between the plates (1) and (2) is positioned. In claim 1 ,
Except for the end plate in the stacking direction, notches (18) are formed on the side surfaces of the vertical members (1a) and (2a) of the plates (1) and (2), and the end plate in the stacking direction is formed. A heat sink in which a part of the vertical member located at the corner of the plate is bent and the bent portion (19) is fitted into the notched portion (18) of each plate.

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