JPH0676872B2 - heatsink - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat sink that is applied to a heat-generating device such as electronic devices to recover heat generated.

[Conventional technology]

Generally, the heat sink has a function of absorbing excess heat energy. For such a heat sink, a thick plate made of a good conductor of heat such as metal is used to cut a flow path groove by using a machine tool such as a milling machine or press punching, and a cover plate is formed so as to cover the flow path groove. Some are formed by joining to a thick plate by brazing, etc.Also, a thin metal plate is press-formed to form a channel-shaped recess, and then a lid plate is bonded to the metal thin plate to form the recess. It is known to be configured to cover.

[Problems to be Solved by the Invention]

However, in the conventional heat sink described above, the shape of the groove formed in the plate material is limited to a planar flow path due to the performance of the machine tool used and the manufacturing cost, and a three-dimensional flow path cannot be formed. Has the problem of.

Alternatively, when the lid plate and the flow path forming plate are joined by brazing in the production of the heat sink, as shown in FIG. 11, before the brazing, the brazing is performed between the plate materials 71, 72, 73, 74. Material 75
Each plate material 71, 72, 73, 74 will be joined with sandwiching,
As shown in FIG. 12, the brazing material flows out from the joint 77, and as shown by the reference numeral 76, a brazing phenomenon occurs, and at the same time, the brazing material in this portion is insufficient and a shrinking phenomenon occurs due to the contraction of the brazing material during solidification. A gap 78 is likely to occur at the joint 77.

Therefore, the defective rate at the time of manufacturing due to defective bonding increases, and the cooling fluid easily leaks due to pinholes or the like at the joint between the lid plate and the flow path forming plate, and the flow rate of the cooling fluid to the lid plate increases. There is a risk of damage to the joint when the joint with the passage forming plate has a problem of pressure resistance and a high cooling fluid pressure is applied.

In order to avoid these drawbacks, as shown in FIG.
Although measures have been taken to chamfer the end faces of the lid plates 81, 84 and the flow path forming plates 82, 83 to form the brazing pool 85, the cost increases cannot be avoided because the number of processing steps increases.

Therefore, an object of the present invention is to solve the above-mentioned problems, and the heat sink body itself is composed of a plurality of plate materials as a whole, and various processing such as a contour shape, a flow path, a communication hole is performed by pressing each plate material. The present invention provides a heat sink that can be manufactured by performing the three-dimensional flow path in a short time and at low cost by joining the plate materials adjacent to each other by brazing.

[Means for Solving the Problems]

The present invention is configured as follows to achieve the above object. That is, according to the present invention, two surface plates each having at least one of the inlet port and the outlet port are formed, and a plurality of laminated surface laminates are arranged between the surface plates, and an appropriate cutting radius of a shear plane is obtained by press punching. And a flow path plate having a large number of independent flow paths formed so as to communicate so that the flow paths of the flow path plate merge with the flow paths of the other flow path plates. The respective flow path plates are laminated in a state, and the contact surfaces between the surface plate and the adjacent flow path plates and between the adjacent flow path plates are integrally joined to each other by brazing. , The void formed between the flow path plates and the flow path plates adjacent to each other is filled with a brazing material and the flow path plates are hermetically joined, and formed on the surface plate. The flowable heat medium flowing in from the inlet port Serial relates sink, characterized in that constructed since the flow path of the flow path plate diversion or merge to and flows out to the outlet port.

[Operation] Since the heat sink according to the present invention is configured as described above, it has the following operation. That is, in this heat sink, an inlet port and an outlet port are provided on either one of the two surface plates, and a plurality of independently arranged flow channels are formed by press punching to form a flow path body with the two surface plates. Since they are hermetically joined together by brazing in a laminated manner between them, the flowable heat medium flowing in from the inlet port flows through the flow passage formed by press-pressing the flow passage body and is exposed. It surely flows out from the exit port of the face plate. Then, during this time, the heat energy conducted to the flow path body through the surface plate is absorbed by the fluid heat medium and carried out to the outside of the heat sink.

In manufacturing this heat sink by press punching, when laminating the flow path plates, a brazing filler metal is attached and this is heated to seal and join. The optimum value of is required experimentally. That is, if the punching radius generated on the cut surface of the flow channel plate after press punching is set to 0.1 mm to 0.5 mm according to the wetting angle of the brazing filler metal, when the flow channel plates are laminated, the brazing deposit on the end face is beautifully brazed. While forming the end face, the brazing phenomenon that the wax flows out from the joint between the plates and the shrinkage phenomenon due to the contraction of the brazing filler metal that occurs when the brazing filler metal is solidified do not occur, and there is no gap in the joint portion it can. Therefore, the defective rate at the time of manufacturing due to a defective joint between the flow path plate and the surface plate is low, and no leak occurs at the joint with the lid plate or the flow path plate.

In the case where the flow path body is composed of a single flow path plate having a meandering flow path, or is composed of a plurality of flow path plates having the same shape of the meandering flow path and laminated and joined to each other, the inlet The fluid heat medium flowing in from the port flows through the flow path and flows out from the outlet port. When it is composed of a plurality of flow path plates, it is possible to form a thin and deep flow path.

When the two flow path plates are overlapped with each other, the flow path body has two types of press punching patterns in which the flow path of one flow path plate communicates with the two flow paths of the other flow path plate. When the flow path plates are alternately laminated and joined, the fluid heat medium flowing from the inlet port reaches the outlet port while branching or merging each time it passes through the flow path. In this case, since the flow path is of the so-called offset fin type, the heat absorption efficiency is good.

In addition, the flow path body is joined to both sides of the flow path plate having a pair of small holes, and the flow path plates of different press punching patterns are joined, and laminated so that the flow direction of the heat transfer medium passing through the small holes is different. In the case of bonding, the flowable heat medium flows in from the inlet port, absorbs heat around the flow path of the flow path plate formed by pressing the flow path, and the flow path plate having the small holes is The small hole descends or rises and flows through a flow path of another press-punching pattern formed on the next flow path plate. In this case, two types of press punching patterns may be prepared and used alternately every time a flow channel plate having flow channels is laminated.

If the flow paths formed in the inlet port, the outlet port and the flow path body are two systems in which fluid heat mediums having different temperatures respectively flow, the fluid heat medium flowing from the inlet port of one system is While circulating around the body, heat is exchanged between the fluid heat transfer mediums having different temperatures flowing in from the inlet port of the other system, and the fluid flows out from the outlet port of each system. In this case, the heat sink can function as a heat exchanger, and the heat sink can be used as a heat exchanger.

〔Example〕

An embodiment of a heat sink according to the present invention will be described below with reference to the drawings. In each of the drawings, the same reference numerals are given to the components having the same configurations and the same functions, and the duplicate description will be omitted.

FIG. 1 (A) and FIG. 1 (B) are an exploded perspective view and an exploded main part enlarged view showing a state of components before joining of an embodiment of a heat sink according to the present invention.

The surface plates 1 and 2 are formed into a rectangular shape as shown by a process such as press punching. In the flow path body 3 sandwiched between the surface plates 1 and 2, a meandering flow path 8 is formed by press punching. The surface plate 1 has holes communicating with the flow path 8 at positions corresponding to both ends of the flow path 8 of the flow path body 3.
6,7 are provided. These holes 6 and 7 are also preferably formed by press punching. In the holes 6 and 7 of the surface plate 1,
An inlet port 4 and an outlet port 5 are attached.

2 (A) and 2 (B) are a perspective view and an enlarged end view showing a heat sink completed by joining the components shown in FIG. 1 (A). The cooling medium, which is a fluid heat medium that has flowed in from the inlet port 4, receives the flow path 8 of the flow path plate 3.
Through which the thermal energy stored in the face plate 2 is carried out and out of the outlet port 5 of the face plate 1.

FIG. 1 (B) shows press-cutting cross sections of the surface plates 1 and 2 and the flow path plate 3. In each plate, a cutting radius R is formed on one side (upper side in the drawing) of the cut surface. ing. In the illustrated example, the press die and the punching speed are adjusted so that the height H of the punched radius R is 0.1 to 0.5 mm.

As shown in FIG. 2 (B), the surface plates 1 and 2 and the flow path plate 3 having the cut-out R formed in this manner are arranged and joined in a laminated manner, so that the brazing surfaces 10 facing each other are formed. Braze in. At this time, on the end surface of the heat sink, a brazing reservoir 9 is generated due to the cutting radius R, and the brazing end surface is finished flat.

FIG. 3 (A) is an exploded perspective view showing a state of components before joining of another embodiment of the heat sink according to the present invention, and FIG. 3 (B) is a flow path plate of the heat sink of FIG. 3 (A). It is an end part enlarged view showing a part of FIG.

The face plates 1 and 2 have an inlet port 4 and an outlet port 5 attached to the holes 6 and 7. In this embodiment, the laminated flow path plate 13 is formed by arranging and joining a plurality of flow path plates 13a, 13b, 13c, 13d formed by press-pressing the meandering flow path 8 of the same shape. Has been done. Therefore, as the flow path of the laminated flow path plate 13, as compared with the flow path 8 shown in FIG.
It is possible to configure the flow path 18 having a depth that is twice the number of flow path plates,
Suitable for constructing narrow and deep channels.

In FIG. 3 (B), the flow path plates 13 a, which form the laminated flow path plate 13,
A part of 13b, 13c, 13d is shown, and each flow path plate 13a, 13b, 1
3c and 13d show the case of punching from a plate material by fine blanking by punching from both upper and lower sides, and punched radius R is formed on both sides of the plate. When the flow path plates 13a, 13b, 13c, 13d are joined on the brazing surface 10, the brazing pool 9 is formed between the adjacent rounded corners R of the flow path plates.
The end face of the laminated body, that is, the laminated flow path plate 13 is formed to have a good finish. In this case, it is desirable that the rounded radius is about 1/2 of the rounded radius R shown in FIG. 2 (B).

FIG. 4 (A) is an exploded perspective view showing still another embodiment of the heat sink according to the present invention, and an offset flow path which is another form of the three-dimensional flow path of the heat sink shown in FIG. 3 (A) is constituted. To be done. FIG. 4 (B) is a plan view showing each flow path plate constituting the laminated flow path plate 23 of the heat sink of FIG. 4 (A). The surface plates 1 and 2 have an inlet port 4 and an outlet port 5 attached to the holes 6 and 7, respectively, and have the same structure as the surface plates 1 and 2 shown in FIG. 1 (A). .

In this embodiment, the laminated flow channel plate 23 is composed of a plurality of flow channel plates, and in the drawing, as an example, the laminated flow channel plate 23 is
It is formed by joining five flow path plates 23a, 23b, 23c, 23d, 23e. In this figure, the flow path plates 23a, 23c, 23e are formed in the flow paths 28 having the same shape, but of course, they may be formed in the flow paths having different shapes. Here, the flow path plates 23a, 23c, 23
In e, a plurality of elongated channels 28a, 28c, 28e having the same shape are formed by press punching in a regular array, and the positions of the channels in the respective channel plates are exactly the same.

A flow path plate 23b sandwiched between the flow path plate 23a and the flow path plate 23c,
The flow path plate 23d sandwiched between the flow path plate 23c and the flow path plate 23e may be similarly formed in the flow paths 28b and 28d having the same shape. The patterns of the flow paths 28b and 28d formed in the flow path plates 23b and 23d are formed in different shapes by press punching. That is, regarding the flow path plates 23a, 23c, 23e, each elongated flow path 28a, 28c, 28e, the inlet side and the outlet side with respect to the flow paths 28b, 28d of the other flow path plates 23b, 23d vertically adjacent to each other. The two ports communicate with each other.

Therefore, the cooling medium flowing in from the inlet port 4 is
a into the upper left flow path 28a of the a, through the upper left flow path hole 28b of the next flow path plate 23b and further into the upper left flow path 28c of the next flow path plate 23c, The upper left channel 28a of the road plate 23a
From the right end of the flow path plate 23b into the flow path 28b in the second uppermost row. From this channel 28b, the cooling medium is the channel 28 of the channel plate 23a.
a and the flow paths 28c and 28d of the flow path plate 23c.

As described above, the cooling medium flowing from the inlet port 4 is
Flow passage plates 23a, 23b, 23c, 23d, 23e are formed in each flow passage 28a, 28b, 28c, 28d, 28e is divided into a plurality of flow passages, and finally flows out again at the outlet side of the flow passage plate 23a. It joins the flow path 28a communicating with the hole 7 and flows out from the outlet port 25.

FIG. 4 (C) shows these flow path plates 23a, 23b, 23c, 23d, 23e.
FIG. 6 is a partial end view showing a flow path plate 23 of the heat sink when the layers are laminated. FIG. 4 (C) is a view similar to FIG. 2 (B), in which the laminated flow path plates and the surface plates 1 and 2 laminated above and below the flow path plates are brazed as in the previous embodiment. It is joined.

FIG. 5 (A) is an exploded perspective view showing still another embodiment having a three-dimensional flow path of the heat sink according to the present invention, and FIG.
FIG. 5B is a laminated flow path plate 33 of the heat sink of FIG.
FIG. The surface plates 1 and 2 connecting the inlet port 4 and the outlet port 5 with the holes 6 and 7 are the surface plates 1 and 2 shown in FIG.
Same as 2.

In this embodiment, the laminated flow channel plate 33 includes three flow channel plates 33a and 33a.
It consists of b and 33c. The flow path plate 33b located at the center has a function as a kind of partition plate, is provided with two communication holes 38b, 38b, and the flow direction of the cooling medium through these communication holes is different as described later.

The flow path plate 33a has a meandering flow path 3 communicating with the inlet port 4.
A hole formed with 8a and communicating with the outlet port 5
39a is formed. Similarly, the flow path plate 33c is formed with a meandering flow path 38c that communicates with the communication hole 38b at one end and communicates with the communication hole 38b at the other end.

Therefore, the cooling medium flowing from the inlet port 34 is
It flows from one end of the flow path 38a of 33a to the other end, descends through the communication hole 38b of the separator 33b, and flows into one end of the flow path 38c of the inflow plate 33c. The cooling medium flowing through the flow path 38c and reaching the other end rises up the flow path 38b of the flow path plate 33b and the hole 39a of the flow path plate 33a.
And flows out from the outlet port 5.

In this embodiment, the laminated flow channel plate 33 is composed of three flow channel plates, but it is also possible to increase the number of flow channel plates by stacking another flow channel plate through a separator plate. Such a channel body 33a,
As for 33b and 33c, the combination of the position of the end portion of the flow path and the position of the communication hole may be taken into consideration, and a sufficient number of stacked flow path plates 33 can be obtained.

FIG. 6 (A) is an exploded perspective view showing another embodiment of the heat sink according to the present invention having a three-dimensional flow path, and FIG. 6 (B) forms the laminated flow path plate of FIG. 6 (A). It is a top view which shows each flow path plate.

In the heat sink in this embodiment, two sets of fluid medium flow channel systems consisting of two flow channels 48, 48 'are provided on the surface plates 41, 42 and the laminated flow channel plate 43, and these cooling medium flow channel systems have different temperatures. This is an example in which two fluid heat mediums are made to function as a heat exchanger in which heat is exchanged between the two mediums. Accordingly, the front plate 41 is also provided with two sets of inlet ports 4 and outlet ports 5. That is, the inlet port 4 and the outlet port 5 are connected to one set of holes 6 and 7 formed in the surface plate 41, and the inlet port 4 and the outlet port 5 are connected to the other set of holes 6 and 7. ing.

In the laminated flow channel plate 43 of this embodiment, two types of flow channel plates are combined to form two sets of flow channels. That is, in the laminated flow channel plate 43, one flow channel plate 43a, 43c, 43e, 43g, a pair of communication holes 49a, 49c, 49e, 49g is formed at one corner of the flow channel plate. A single meandering channel 48a, 48c, 48e, 48g serving as an inlet end and an outlet end is formed at the other corner.

In the laminated flow channel plate 43, each flow channel plate 43a, 43c, 43e, 43g
Other flow path plates 43b, 43d, 43f located between the, function as a separator, the positions corresponding to the communication holes 49a, 49c, 49e, 49g and the meandering flow paths 48a, 48c, 48e, 48g. Communication holes 49b, 49d, 49f are provided at positions corresponding to both ends. It is preferable that the communication holes at the four corners are formed at symmetrical positions because the parts can be shared in terms of processing. Since the laminated flow channel plate 43 can be configured by two types of flow channel plates, the flow channel plate can be easily manufactured by press punching at a very low cost, and the manufacturing control of the finished moat is easy.

Such two types of flow path plates are alternately stacked, but flow path plates 43a, 43c, 43e, 43g having meandering flow paths 48a, 48c, 48e, 48g.
Are further staggered in alternating directions.

That is, one fluid heat medium flowing in from the inlet port 4 of the other set passes through the communication hole 49a of the flow path plate 43a and the communication hole 49b of the flow path plate 43b, and the meandering flow path 48c of the flow path plate 43c. Of the fluid heat medium, a part of the fluid heat medium flows through the flow path 48c. The other flowable heat medium further descends and the communication hole 4 of the flow path plate 43d.
9d, through the communication hole 49e of the flow path plate 43e, and the communication hole 49f of the flow path plate 43f to reach one end of the meandering flow path 48g of the flow path plate 43g. The medium flowing in the meandering flow path 48g is a communication hole 49f of the flow path plate 43f, a communication hole 49e of the flow path plate 43e, a communication hole 49d of the flow path plate 43d, a flow path plate 43c.
The other end of the meandering flow path 48c, the communication hole 49b of the flow path plate 43b, the flow path plate 4
It flows out from the outlet port 5 through the communication hole 49a of 3a.

In addition, the fluid heat medium that has flowed in from the other set of the inlet ports 4 similarly has the meandering flow path of the flow path plates 43a and 43e.
Flow through 48e and out exit port 5.

In this way, the flowable heat medium with different temperature is
The two flow paths are independently circulated, and heat exchange is performed in the meantime. Moreover, since the respective flow paths are alternately arranged as in this example, heat exchange between both media can be efficiently performed.

FIG. 7 is a flow-schematic block diagram showing the manufacturing process for manufacturing the heat sink according to the present invention.

That is, first, the contour shape, the flow path, the meandering flow path, and the communication hole are all formed by press punching on the plate-shaped material forming the surface plate and the flow path plate (step 50).

Next, the material for which the press punching process has been completed is subjected to a surface modification process including a surface roughening process and a subsequent cleaning process (step 51).

After performing the surface modification treatment on the plate-shaped material, in the assembly process for joining each surface plate and the flow path plate, holes are formed in the parts of the inlet port and the outlet port as the part assembly process. In addition to being attached to the other surface plate, a brazing material for joining is assembled between the surface plate and the flow path plates and between the flow path plates as a brazing material assembling step (step 52).

After the assembling process is completed, the process proceeds to the process of joining the surface plates and the flow path plates (step 53). In step 53, first, the entire assembled surface plate and flow path plate is heated (heating step), and the surface plate and flow path plate in which the assembled brazing material is melted, or between the flow path plates After brazing (brazing process), finally, the surface plates and the flow path plates joined to each other by brazing are cooled (cooling process). The heat sink according to the present invention is completed through the above steps.

FIG. 8 shows that when the surface plate or the flow path plate is brazed, there is no misalignment, dent, brazing or brazing.
It is the figure which showed the relationship only of the punching at the time of press punching with respect to the board thickness of a surface board and a flow-path board.

FIG. 8 is a region diagram showing the relationship between the plate thickness (plotted on the horizontal axis) of the plate-shaped material forming the surface plate and the flow channel plate and the height of the rounded radius R (plotted on the vertical axis).

In FIG. 8, the hatched area shows the optimum area for brazing according to the wetting angle of the brazing material, and the drawing height H, that is, the length of the cutting radius R seen in the plate thickness direction is , If the plate thickness is 0.5 mm or more, it may be in the range of 0.1 mm to 0.5 mm, and if the plate thickness is in the range of 0.1 mm to 0.5 mm, the punching radius R from 0.1 mm or more to the length of the plate thickness
It is understood that it is sufficient to form

Here, in the region above the hatched region in FIG. 8, that is, in the region in which only the punching radius R is excessively large with respect to the plate thickness, the brazing becomes inconsistent as shown in FIG. A phenomenon occurs in which a dent 80 or a depression 80 is likely to occur. Further, in the region below the hatched region in FIG. 8, that is, in the region where only the cutting radius R becomes too small with respect to the plate thickness, as shown in FIG. 79 phenomenon easily occurs.

〔The invention's effect〕

The heat sink according to the present invention is configured as described above and has the following effects. That is, the heat sink according to the present invention has two face plates each having an inlet port and an outlet port formed in at least one of them, and the face plates are laminated between the face plates and are integrally joined by brazing. Since the flowable heat medium flowing in from the inlet port can flow out to the outlet port, the flow channel plate has a plurality of independent flow channels formed by press punching, so that the flow channel is formed in the flow channel plate. However, it is not necessary to form the flow channel in the flow channel plate by cutting as in the conventional case.

Therefore, the shape of the flow path can be formed in a complicated and highly accurate manner as compared with forming the flow path on the flow path plate by cutting.

In addition, when the length of the flow path becomes long, the machining time becomes longer in the case of cutting in proportion to the length, but in the case of press punching, it can be formed by one press punching operation, so Is shortened regardless of the length of the channel.

Further, in the case of press punching, if the number of flow path plates to be laminated is increased, the depth of the flow path can be increased correspondingly, and as in the case of cutting, the processing time becomes longer depending on the depth. In addition, there is no limit in depth as in the case of cutting.

In the case of cutting or press forming, it was not possible to make a three-dimensional flow path because the shape of the groove was limited in plan, but multiple press-cut flow path plates were stacked. In this case, the structure of the flow channel itself can be configured into a three-dimensional structure.

As described above, in the production of this heat sink, the flow path plate is formed by the press punching process, and then the surface modification treatment step, the assembly step and the joining step are performed,
Since a large number of flow path plates constituting the heat sink can be formed in a short time, mass productivity is excellent and manufacturing can be performed at low cost.

The contour shape of the flow channel plate itself can also be formed from the plate material by press punching, but the punching radius generated on the cut surface of the flow channel plate subjected to the press punching is 0.1 mm or more depending on the wetting angle of the brazing material. If it is set to 0.5 mm, empirically, when the flow path plates are stacked and joined by brazing, a clean brazing end face is formed by the brazing deposit on the end face, so the brazing phenomenon and the brazing material The shrinkage phenomenon due to the shrinkage of the brazing material that occurs during solidification does not occur, and no gap is formed in the joint portion, and sealing can be performed.

Therefore, the defective rate at the time of manufacturing due to a defective joint between the flow path plate and the surface plate is low, and no leak occurs at the joint with the lid plate or the flow path plate. There is no risk of damage to the joint even when high pressure is applied to the joint.

[Brief description of drawings]

FIG. 1 (A) is an exploded perspective view showing the state of components before joining of an embodiment of a heat sink according to the present invention, and FIG. 1 (B) is a joining of an embodiment of the heat sink of FIG. 1 (A). FIG. 2 (A) is a perspective view showing a state in which the heat sink shown in FIG. 1 is completely joined, and FIG. 2 (B) is shown in FIG. 2 (A). ) End enlarged view, FIG. 3 (A) is an exploded perspective view showing a state of components before joining of another embodiment of the three-dimensional flow path of the heat sink according to the present invention, and FIG. 3 (B) is FIG. 3 (A) is an enlarged end view showing a part of the flow path plate of the heat sink, and FIG. 4 (A) is still another embodiment of the offset flow path which is another form of the three-dimensional flow path of the heat sink according to the present invention. FIG. 4B is an exploded perspective view showing the state of the components before joining in the example, and FIG. 4B is each flow of the heat sink shown in FIG. 4A. Plan view of the plate, FIG. 4 (C) is an end enlarged view after bonding of the channel plate shown in FIG. 4 (B), fifth
FIG. 5A is an exploded perspective view showing a state of components before joining of another embodiment of the three-dimensional flow path of the heat sink according to the present invention, and FIG. 5B is a perspective view of the heat sink shown in FIG. FIG. 6 (B) is a plan view of each flow path plate, FIG. 6 (A) is an exploded perspective view showing the state of components before joining of still another embodiment in which the heat sink according to the present invention can function as a heat exchanger, FIG. 6 (B). ) Is a plan view of each flow path plate of the heat sink shown in FIG. 6 (A), FIG. 7 is a block diagram showing a manufacturing process in manufacturing the heat sink according to the present invention in a flow diagram, and FIG. FIG. 9 is a region diagram showing the relationship between the plate thickness of the plate-like material forming the surface plate and the flow channel plate and the height of the rounded radius in manufacturing, and FIG. 9 is a schematic view showing an example of the state of the flow channel plate of the heat sink with the large rounded radius. An explanatory diagram and Fig. 10 show a heater with a small radius. FIG. 11 is a schematic explanatory view showing another example of the state of the flow channel plate of the sink, FIG. 11 is a schematic explanatory diagram showing another example of the state of the flow channel plate of the heat sink with a small draft radius before joining, and FIG. FIG. 11 is a schematic explanatory view showing a state after joining the flow path plates of the heat sink shown in FIG. 11, and FIG. 13 is a schematic explanatory diagram showing still another example of the state after joining the flow path plates of the conventional heat sink. 1,2,41,42 …… Surface plate, 3,13a, 13b, 23a.23b, 23c, 23d, 23
e, 33a, 33b, 33c, 43a, 43b, 43c, 43d ... flow path plate, 13,23,33,
43 ... laminated flow board, 4 ... inlet port, 5 ... exit port, 6,7 ... hole, 8,18, 28, 38, 48, 48 '... flow path.

Claims (1)

[Claims] 1. A plurality of surface plates each having at least one of an inlet port and an outlet port, and a plurality of surface plates arranged in a laminated manner between the surface plates, and an appropriate punching radius is produced on a sheared surface by press punching. And a flow path plate having a large number of independent flow paths formed in such a manner that the flow path of the flow path plate is in a communicating state so as to be branched or merged with the flow path of the other flow path plate. The respective flow path plates are respectively laminated, and contact surfaces between the flow path plates adjacent to the surface plate and the adjacent flow path plates are integrally joined to each other by brazing, Between the adjacent flow channel plate and the flow channel plate, a void formed by the punched round is filled with a brazing filler metal and the flow channel plate is hermetically joined,
A heat sink characterized in that the fluid heat medium flowing in from the inlet port formed in the surface plate is divided or merged in the flow passages of the flow passage plates to flow out to the outlet port. .