JP4747220B1 - Heat sink using multi-layer heat dissipation unit - Google Patents

Abstract

Cooling performance is improved in a heat sink in which a heat dissipation unit is thermally connected to a base plate.
A heat dissipation unit includes a first fin layer F1 in which plate-like metal portions and opening hole portions are alternately and periodically formed in a plane perpendicular to the base plate, with a direction parallel to the base plate as a periodic direction. The second fin layer F2 is a multi-layer type in which the two fin layers F2 are arranged in parallel. As a whole heat sink structure, the cooling fluid flowing in from the inlet portion is guided to the opening hole portion of the first fin layer, and at least a part thereof Is moved between the first and second fin layers along the first and second fin layers, and then guided from the opening hole portion of the second fin layer to the outlet portion. Since the thickness of the heat radiating unit itself can be reduced, a large number of heat radiating units can exist within a predetermined width on the base plate, thereby improving the cooling efficiency and reducing the pressure loss.
[Selection] Figure 2

Description

    The present invention relates to heat sinks used for heat dissipation of various electronic parts such as CPUs, integrated circuits and semiconductor elements, electronic devices, and other various electric devices, and is particularly excellent in heat dissipation efficiency and manufactured with a small number of parts. Is about a simple heat sink.

As is well known, heat sinks are often provided for heat dissipation in electronic components such as CPUs, integrated circuits, and semiconductor elements, electronic devices, and various electric devices. The typical conventional example of this type of heat sink shown in FIG 5.

In FIG. 25 , a base plate 1 to which a heat source such as a CPU, an integrated circuit, or a semiconductor element is thermally connected is made of a metal having high thermal conductivity such as aluminum, copper, or an alloy thereof. On the base plate 1, a plurality of long plate-like heat radiating fins 2 made of a metal having a high thermal conductivity are erected in parallel to constitute a heat sink 3 as a whole.

In actual use conventional general heat sink shown in FIG. 2 5 as described above, for example, air as a cooling fluid, from one end as indicated by arrow P in FIG 5 of the base plate 1 Sprayed along the upper surface and in the longitudinal direction (the direction along the plate surface of the plate-like heat radiation fins 2), air flows between the adjacent heat radiation fins 2 and flows out of the heat sink 3 from the other end. The heat transmitted from the heat generating component to the plate-like heat radiation fin 2 via the base plate 1 is radiated to the atmosphere.

  By the way, in such a conventional general heat sink, the length of the plate-shaped radiating fins (the length in the direction from the windward side to the leeward side of the cooling air) is long, or the adjacent plate-shaped radiating fins are mutually connected. If the interval between them is small, cold air is in contact with the surface of the leeward portion of the radiating fin, but the air that is in contact with the leeward portion of the radiating fin has already risen in temperature, and as a whole In addition to not being able to obtain a sufficient heat dissipation effect, there is a problem in that heat dissipation of the heat-generating components that are thermally connected in the vicinity of the portion of the base plate near the leeward side of the radiating fin is not sufficiently performed.

  Here, it is conceivable to increase the interval between the heat dissipating fins and to flow a large amount of cooling air at a high speed in order to improve the cooling efficiency. In this case, the heat sink can be provided in a heat sink of a predetermined size. The number of fins is reduced, the total area of the heat radiating portion is reduced, and only the air passes through the central portion between adjacent radiating fins at high speed, and heat exchange is not sufficiently performed.

As described above, the conventional heat sink shown in FIG. 25 does not provide a sufficient heat dissipation effect. In particular, when cooling a plurality of heat generating components arranged in a deep depth, the heat generating component on the leeward side is particularly effective. It could not be cooled.

  In order to solve such a problem, a heat sink as shown in Patent Document 1 has already been proposed. The heat sink shown in this Patent Document 1 basically reduces the flow velocity of cooling air flowing between a large number of plate-like heat dissipating fins, so that the temperature boundary layer (that is, the cooling air flow passes between the fins). When passing, between the part of the air flow where the heat is transferred by flowing while contacting the surface of the radiating fin and the temperature rises, and the part of the air flow that is away from the surface of the radiating fin and is not affected by the heat The temperature of the surface of the heat sink plate radiating fin is averaged downwind (heat sink outlet side) This is based on the idea that the temperature can be close to the temperature.

It shows some examples of the structure of the heat sink of such invention of Patent Document 1 in FIGS. 19 to 2 4. In the invention of Patent Document 1, a plurality of plate-like fins 2 arranged in the vertical direction at a predetermined interval is called a “fin portion”. I think.

Of these, an example of FIG 4. In this example, on the base plate 1 to which at least one heat-generating component is thermally connected, a plurality of plate-like fins 2 are predetermined in a vertical direction (a direction from the inlet portion 5 side to the outlet portion 8 side). One heat dissipating unit 4 (Note: in Patent Document 1, this is referred to as “fin portion”) is formed at intervals, and each of these two heat dissipating units is V-shaped ( Note: In Patent Document 1, this arrangement is called “C-shaped”, but it is more appropriate to call it “V-shaped” because the tips are arranged so that they touch each other. Then, it is expressed as “V-shaped”). That is, the distance between the two heat radiating units 4 is gradually narrowed in the direction of the cooling air flow P from the inlet portion 5 side to the outlet portion 8 side. The heat radiating units 4 are arranged so as to contact each other at the end of the heat radiating unit on the outlet 8 side.

  In such an arrangement, the flow of the cooling air is guided in the lateral direction (direction perpendicular to the direction from the inlet portion toward the outlet portion), and is arranged at predetermined intervals in the vertical direction in each heat radiating unit 4. It flows through between the plate-like fins 2 that are present.

As shown in FIG. 2 4, by continuously disposed without interruption in the lateral direction in a V-shaped configuration comprising a heat dissipation unit 4 in pair in the plate surface and parallel to the plane of the base plate 1, a number of V-shaped A flow of cooling air can be induced inside the mold arrangement.

  According to the invention proposed in Patent Document 1 as described above, the cooling capacity is high with the same envelope volume, and there is almost no temperature difference in the windward and leeward direction (that is, cold air contacts the fins even in the leeward). An excellent heat sink can be obtained. In particular, in the case of a heat sink having a long base plate on which heat dissipating fins are disposed, a heat sink having a remarkably excellent heat dissipation efficiency can be obtained.

  Further, a heat sink as shown in Patent Document 2 has been proposed as a method for improving the cooling capacity by a method different from that of Patent Document 1. In the proposal of Patent Document 2, in a heat sink cooling device in which a heating element is arranged on a heat sink having a plurality of straight fins, another fin is arranged obliquely with respect to the longitudinal direction of the straight fin upstream of the straight fin inflow side. Is. As a result, the fluid flowing out from the other fins flows obliquely into the straight fins, causing separation of the air layer on each fin suction surface side of the straight fins, increasing the heat transfer coefficient on the fin surface, and improving the cooling capacity. It can be improved.

JP 2008-205421 A JP 2004-281484 A

As described above, although the heat sink has been proposed in Patent Document 1 is excellent in cooling performance, however the heat sink in Patent Document 1, for example 19 to second heat radiating unit itself considerable thickness as can be seen from 4 have. As a result, in the heat sink, the cooling fluid from the inlet up to the heat dissipation unit passage (in the example of FIG. 2 4, the space between the V-shape at the front side of the V-shaped configuration refers to), and the cooling fluid passage from exiting the radiator unit up to the outlet of the heat sink (in the example of FIG. 2 4, sandwiched V-shape on the other side of the V-shaped configuration However, the cooling fluid becomes difficult to flow and the pressure loss increases, and there is a possibility that sufficient cooling efficiency may not be obtained. As described below, this problem is, as the angle θ formed by two radiating units constituting the V-shape in V-shaped arrangement shown in FIG. 2 4 decreases, becomes remarkable.

  In order to solve such a problem, it is desired to make the thickness of the heat radiating unit as thin as possible. However, conventionally, this point has not been particularly studied.

  The present invention has been made against the background of the above circumstances, and it is possible to reduce the thickness of the heat dissipation unit itself without greatly reducing the cooling performance, thereby reducing the pressure loss and further improving the cooling efficiency. A heat sink that can be improved is provided.

  The present inventors have made various studies on means for solving the above problems.

First, are referred to as heat radiation unit V-shaped pair as shown in FIG. 2 4 proposed in Patent Document 1 (Patent Document 1 "shaped ha", where as described above In this case, the opening angle of the V-shaped fin array, that is, the angle θ formed by the two heat dissipating units constituting the V-shape has an influence on the cooling efficiency of the heat sink. The impact is as follows.

In V-shaped fins arranged, as can be readily understood from FIG. 2 4, opening the smaller the angle theta, vertically from the side of the constant width (inlet 5 of the base plate in a direction toward the side of the outlet portion 8 The number of heat dissipating units that can be provided on the upper side) can be increased. In order to increase the cooling efficiency of the heat sink, it is preferable that as many fins as possible exist in a predetermined range of space.

  However, when the opening angle θ is reduced, the region sandwiched between the heat radiating units 4 on both sides (that is, the passage of the cooling fluid from the inlet 5 to the heat radiating unit 4, and after passing through the heat radiating unit 4). The region corresponding to the cooling fluid passage from the heat radiation unit 4 toward the outlet 8 is narrowed.

  In order to increase the cooling efficiency of the heat sink, it is preferable to reduce the opening angle θ so that as many heat dissipating units as possible can exist within a certain width of the base plate. If the passage of the cooling fluid becomes too narrow by reducing the size, the cooling efficiency is reduced.

Therefore, there is a need for a measure that makes it possible to secure a wider cooling air passage even if the opening angle θ is reduced. For this purpose, it is considered that the “thickness” of the heat radiating unit itself may be reduced. That is, for example, in order to achieve a good cooling efficiency the heat sink in a V-shaped fin array shown in FIG. 2. 4, at the same time to reduce the V-shaped angle θ of thin "thickness" of the heat radiating unit itself It is desirable to do.

Here, if the heat dissipation unit is a heat sink as shown in FIG. 2 4 which are arranged in a V-shape, relative arrangement of fins surface of the heat radiating unit 4 (the surface are lined up each plate fin 2), each plate the smaller angle between the plate surface of the fin 2 is α (see FIG. 2 6), "thickness" of the heat-dissipating unit (shown as in FIG. 2 6 "t") becomes thinner.

  Therefore, an experiment was conducted to set the angle α to 0 ° as the limit of reducing the thickness of the heat radiating unit 4 (see FIG. 1). However, if the plate-like fins 2 are connected to each other to form a single plate, the cooling fluid cannot pass through the heat radiating unit 4 and is in a closed state. An interval between the fins 2 was set apart. That is, a so-called “fin layer” in which the plate-like metal (fin) portions 21 and the opening hole portions 22 are alternately and periodically arranged in a plane perpendicular to the base plate 1 with a direction parallel to the base plate as a periodic direction. Formed.

  Although the cooling performance was examined with such an arrangement, a satisfactory result as expected was not obtained. This is because the number of plate-like fins that can exist in the space of the predetermined range of the heat radiating unit is too small, and the total surface area of the fins contributing to cooling is too small. It is believed that there is.

Therefore, another similar one is provided behind each fin layer (referred to as the first fin layer F1) shown in FIG. 1 above and in parallel with the fin layer F1 at a predetermined interval. An attempt was made to increase the number of plate-like fins existing in the space of a predetermined range of the heat radiating unit by arranging each fin layer (these are referred to as second fin layers F2) (see FIG. 2). If arranged in this manner, the heat dissipation unit has a thickness equal to the thickness of the second fin layer F2 and the gap between the first fin layer F1 and the second fin layer F2 as compared with the case of the fin layer F1 alone. the total thickness of the is to be increased, for example, FIG. 2 4 and does not lead to the arrangement as shown in FIG. 2 2 more plate fin rows occupied thickness. The heat dissipating unit having such an arrangement composed of two fin layers arranged in parallel to each other at a predetermined interval will be referred to as a “multi-layer heat dissipating unit”.

  That is, the multi-layer type heat radiation unit referred to in this specification is such that, as shown in FIG. 2, the plate-shaped metal portions 61 and the opening hole portions 62 are alternately arranged in a plane perpendicular to the base plate, with the direction parallel to the base plate as a periodic direction. The first fin layer F1 periodically arranged on the first fin layer F2 and a second similar fin layer F2 arranged in parallel to the first fin layer F1 at a predetermined interval (this second layer) The plate-like metal portion of the fin layer F2 is indicated by reference numeral 63, and the opening hole portion is indicated by reference numeral 64).

  In such an arrangement, the cooling fluid that has flowed in from the inlet portion (lower side in FIG. 2) of the heat sink is first the plate surface of the fin plate (plate-like metal portion 61) of the first fin layer F1. To the opening hole portion 62 while taking heat away from it, and then passes through the opening hole portion 62 to reach between the first fin layer F1 and the second fin layer F2, and along the fin layers. The plate surface of the fin plate (plate-like metal portion 61) of the first fin layer F1 and the plate surface of the fin plate (plate-like metal portion 63) of the second fin layer F2, , And reaches the opening hole portion 64 of the second fin layer, and passes through the opening hole portion 64 toward the outlet portion of the heat sink (upper side in FIG. 2). At this time, the cooling fluid flowing between the first fin layer F1 and the second fin layer F2 is the plate surface of the plate metal portion 61 of the first fin layer F1 and the plate metal portion 63 of the second fin layer F2. While moving between them, meandering and wobbling between them, there is a movement that moves along those plate surfaces, which increases the chances of contact between the cooling fluid and the fin plate surface, and heat dissipation The process proceeds effectively.

  Here, the plate surface of the first fin layer F1 is slanted with respect to the inflow direction from the inlet of the cooling fluid (as if the "potential" surface of pressure is considered, it seems as if it stands up to it) Therefore, the cooling fluid is strongly pressed against the plate surface of the first fin layer F1, and the heat transfer coefficient from the cooling fluid to the first fin layer F1 is Is expected to improve the cooling performance. Further, as described in the above-mentioned Patent Document 2 (particularly, [0021] column), separation of the air layer occurs on each fin suction surface side, the heat transfer coefficient on the fin surface is increased, and the cooling capacity is increased. Will be improved.

Incidentally, since the sheet metal part 61 or 63 and the open hole portion 62 or 64 that are periodically arranged alternately multilayered heat-dissipating unit each fin layer, arranged so as mutually complementary to each other, these The first fin layer F1 and the second fin layer F2 can be made from a common metal plate. The specific configuration will be described later in detail, but a representative example is shown in FIGS. 3 to 5, and the outline will be described next.

That is, as shown in FIGS. 3 to 5, a large number of belt-like zones 57 (see FIG. 5) that are continuously arranged except for the upper and lower edges 53 and 55 are formed from one metal plate 51. Extruded belts are formed by bending the strips 57 so as to alternately extrude or retract toward both sides of the plate surface, with a large number of vertical cuts 59 (see FIG. 5) as a boundary. The entire zone and the entire pull-in zone may be configured to form the first fin layer F1 and the second fin layer F2, respectively. In this way, the first fin layer F1 and the second fin layer F2 of the multilayer heat dissipating unit can be formed at the same time only by cutting and bending from a single metal plate. It becomes extremely easy. Therefore, the present invention is basically based on the use of a multilayer heat dissipating unit in which the first fin layer F1 and the second fin layer F2 are formed from a single metal plate 51.

On the other hand, with respect to the passage of the cooling fluid, by a multilayered heat radiating unit, such as a heat-dissipating unit shown in FIGS. 3 to 5, since it is possible to reduce the thickness of the heat dissipation unit itself, as described above Even with a V-shaped array structure, higher cooling efficiency can be ensured.

  Specifically, the present invention is as follows.

That is, in the heat sink using the multilayer heat dissipation unit according to the first aspect of the present invention, the heat dissipation unit for transferring heat to the cooling fluid is provided on the base plate to which the heat generating component is thermally connected. In the heat sink provided in a state of being connected to each other, the heat sink has an inlet portion into which the cooling fluid flows in and an outlet portion through which the cooling fluid flows out, and each of the heat dissipation units is in a plane perpendicular to the base plate. In which the first fin layer and the second fin layer in which the plate-shaped metal portions and the opening hole portions are alternately and periodically formed with the direction parallel to the base plate as a periodic direction are mutually predetermined between the layers. consists multilayered heat-dissipating unit composed disposed in parallel at a distance, the first fin layer and the second fin layer of the multilayered heat dissipation unit in their entirety The metal plate is cut and raised from a single continuous metal plate, and a number of cuts along the vertical direction are formed on the single metal plate in parallel at predetermined intervals, leaving the upper and lower edges. As a result, a belt-like zone is formed in parallel between the cuts, and a large number of the belt-like zones are alternately cut out on the opposite side of the plate surface and cut on one side of the plate surface. A plurality of raised belt-like zones each constitute a plate-like metal portion of the first fin layer, and a plurality of belt-like zones cut and raised on the other side of the plate surface are respectively provided to the second fin layer. As a whole heat sink configuration, the cooling fluid flowing from the inlet portion is guided from the inlet portion to the opening hole portion of the first fin layer of the multilayer heat dissipation unit. The amount of cooling fluid that passes through the opening At least a part of the metal plate moves between the first fin layer and the second fin layer along the plate surface of the plate-like metal portion, and then passes from the opening hole portion of the second fin layer to the outlet portion. As a result, the flow of the cooling fluid is guided so as to be guided.

The heat sink with multilayered heat radiation unit of inventions of claims 2, on the base plate heat generating component is thermally connected, the heat dissipation unit for performing heat transfer base plate and the heat to the cooling fluid In the heat sink that is provided in a state of being connected,
An inlet portion through which the cooling fluid flows in and an outlet portion through which the cooling fluid flows out;
The heat dissipating unit includes a first fin layer and a second fin layer formed by alternately and periodically forming a plate-like metal portion and an opening hole portion in a plane perpendicular to the base plate with a direction parallel to the base plate as a periodic direction. The fin layer is composed of a multilayer heat dissipating unit that is arranged in parallel with a predetermined distance between those layers,
The first fin layer and the second fin layer of the multilayer heat dissipating unit are composed of a single continuous metal plate as a whole, and the upper and lower edges of the single metal plate A plurality of cuts along the vertical direction are formed in parallel with a predetermined interval, so that a band-like zone is formed in parallel between the cuts. A plurality of belt-like zones cut and raised on one side of the surface and formed on one side of the plate surface each constitute a plate-like metal portion of the first fin layer, and a plate A plurality of band-like zones that remain without being extruded from the surface constitute a plate-like metal portion of the second fin layer,
As a configuration of the entire heat sink, the cooling fluid that has flowed in from the inlet portion is led from the inlet portion to the opening hole portion of the first fin layer of the multilayer heat dissipation unit, and cooled through the opening hole portion. After at least a part of the working fluid moves between the first fin layer and the second fin layer along the plate surface of the plate-like metal portion, the outlet from the opening hole portion of the second fin layer It is configured to guide the flow of the cooling fluid so as to be guided to the section .

Here, in the heat sink using the multilayer heat dissipation unit defined in claim 1 or claim 2 as described above, as the form of the arrangement structure of the multilayer heat dissipation unit or the overall configuration of the heat sink, For example, there are the following forms.

That is, first, in the first embodiment, two multilayer heat dissipation units are used as the heat dissipation unit, and the structure for inducing the flow of the cooling fluid is a mutual configuration of the two multilayer heat dissipation units. Are arranged so that the distance between them gradually decreases from the inlet side toward the outlet side, and these two multilayer heat dissipation units are in contact with each other at the end of the multilayer heat dissipation unit on the outlet side. It is the form arranged in .

Further, in the second mode, in the first mode, a plurality of multilayer heat dissipation units are arranged in a direction perpendicular to the direction from the inlet to the outlet in a plane parallel to the plate surface of the base plate. It is a form that is repeated several times and connected without interruption .

Further, in the third embodiment, as a configuration for guiding the flow of the cooling fluid, a large number of the multilayer heat dissipating units are arranged in parallel in a direction perpendicular to the direction from the inlet to the outlet. The space sandwiched between the multilayer heat dissipating units is used as a cooling fluid passage, and the cooling fluid passage includes a baffle plate for connecting adjacent end portions of the multilayer heat dissipating units. It is configured such that the opening direction of the cooling fluid passage is alternately switched between the inlet portion side and the outlet portion side by being alternately provided at the end portions on the portion side or at the end portions on the outlet portion side. It is a form .

According to a fourth aspect of the present invention, there is provided a configuration for inducing a flow of the cooling fluid in the space on the first fin layer side of the multilayer heat dissipating unit and the opening of the inlet portion and the first fin layer. Except for the holes, the second partition wall is provided in the space on the side of the second fin layer of the multilayer heat dissipating unit and the first partition wall for preventing outflow of cooling fluid and inflow of fluids other than the cooling fluid. except the opening hole and the outlet portion of the fin layer is a second embodiment comprising and a partition wall for preventing the outflow and inflow of fluid other than the cooling fluid of the cooling fluid.

In addition, in a fifth form according to the fourth form , the first partition is separated from the first fin layer of the multilayer heat dissipating unit and is substantially parallel to the first fin layer. A first side wall plate that is provided, and a first side wall plate that connects the end portion of the multi-layer heat radiation unit on the outlet side and the first side wall plate in a space on the first fin layer side of the multi-layer heat radiation unit. And a second side wall plate provided so that the second partition wall is separated from the second fin layer and substantially parallel to the second fin layer, and the second side wall plate. in a form in space on the side of the fin layer is constituted by a second baffle plate for connecting with said inlet side of the multi-layer heat dissipating unit end and the second side wall plates.

Further, a sixth aspect is the fourth aspect , wherein the first partition is constituted by a third side wall plate provided in a space on the first fin layer side of the multilayer heat dissipating unit, In the space on the first fin layer side, the distance between the first fin layer and the third side wall plate gradually becomes narrower from the inlet side toward the outlet side, and the heat dissipation unit end on the outlet side And the second partition is constituted by a fourth side wall plate provided in a space on the second fin layer side of the heat dissipation unit, and the heat dissipation unit In the space on the second fin layer side, the distance between the second fin layer and the fourth side wall plate gradually becomes narrower from the outlet portion side toward the inlet portion side, and the heat dissipation unit end on the inlet portion side both are configured to contact substantially in parts It is a state.

In addition, in a seventh aspect, in any one of the fourth to sixth aspects, the arrangement of the combination of the heat dissipation unit, the partition wall, the side wall plate, and the baffle plate in these forms is parallel to the plate surface of the base plate. It is a form that is repeated a plurality of times in a direction perpendicular to or parallel to the direction from the inlet to the outlet.

  In the heat sink of the present invention, by using the multilayer heat dissipation unit, the thickness of the multilayer heat dissipation unit itself can be reduced without greatly impairing the cooling efficiency. Therefore, the total area of the heat radiating metal plates (fins) can be increased, and the cooling efficiency can be improved.

  Further, since the thickness of the multilayer heat dissipating unit itself is thin, a cooling fluid passage occupying the space on the base plate having a predetermined width, that is, a cooling fluid passage from the heat sink inlet to the heat dissipating unit, and After passing through the heat dissipation unit, it becomes possible to secure a wider passage of cooling fluid from the heat dissipation unit to the heat sink outlet, improving the overall cooling efficiency of the heat sink, and at the same time, cooling fluid The pressure loss with respect to can be further reduced, which also contributes to the improvement of the cooling efficiency.

Furthermore, in the heat sink according to the present invention, the first and second fin layers can be simultaneously formed by cutting up (extrusion) from the plate surface of a single metal plate when making a multilayer heat dissipation unit. In addition, it is easy to manufacture, and also in the work for assembling the heat sink, it is not necessary to individually attach the first and second fin layers on the base plate, and the assembling work is also facilitated.

FIG. 1 is a schematic plan view of a heat dissipating unit for explaining the concept underlying the present invention. FIG. 2 is a schematic plan view of the heat radiating unit for explaining the principle concept of the present invention. FIG. 3 is a perspective view showing an example of a multilayer heat dissipating unit used in the heat sink of the present invention. 4 is a plan sectional view of the multilayer heat dissipating unit shown in FIG. 3, which is cut along the aa plane in FIG. FIG. 5 is a diagram showing a strip-shaped zone of a single metal plate before the multilayer heat radiation unit shown in FIG. 3 is cut and raised. FIG. 6 is a schematic perspective view showing a heat sink according to the first embodiment of the present invention. FIG. 7 is a schematic plan view of the heat sink shown in FIG. FIG. 8 is a diagram for explaining an experiment conducted on the operation of the heat sink of the present invention, particularly the flow of the cooling fluid. FIG. 8A is a schematic plan sectional view showing the entire configuration of the heat sink used in the experiment. , (B) is a schematic plan sectional view showing an enlarged part B on the upstream side of (A), and (C) is a schematic plan view showing an enlarged part C on the downstream side of (A). It is sectional drawing. FIG. 9 is a perspective view showing another example of the multilayer heat dissipating unit used in the heat sink of the present invention. 10 is a cross-sectional plan view of the multilayer heat dissipating unit shown in FIG. 9, which is cut along the bb plane in FIG. FIG. 11 is a schematic perspective view showing a heat sink according to a second embodiment of the present invention. FIG. 12 is a schematic perspective view showing a heat sink according to a third embodiment of the present invention. FIG. 13 is a schematic plan cross-sectional view of the heat sink shown in FIG. FIG. 14 is a schematic perspective view showing a heat sink according to a fourth embodiment of the present invention. FIG. 15 is a schematic plan sectional view showing a heat sink according to a fifth embodiment of the present invention. FIG. 16 is a schematic perspective view showing a heat sink according to a sixth embodiment of the present invention. 17 is a schematic plan sectional view of the heat sink shown in FIG. FIG. 18 is a schematic perspective view showing a heat sink according to a seventh embodiment of the present invention. FIG. 19 is a schematic partially cutaway perspective view showing a first structural example of a conventionally proposed heat exchanger. FIG. 20 is a schematic plan view of the heat exchanger shown in FIG. FIG. 21 is a schematic plan view showing a second structural example of a conventionally proposed heat exchanger. FIG. 22 is a schematic plan view showing a third structural example of a conventionally proposed heat exchanger. FIG. 23 is a schematic perspective view showing a fourth structural example of a conventionally proposed heat exchanger. FIG. 24 is a schematic perspective view showing a fifth structural example of a conventionally proposed heat exchanger. FIG. 25 is a schematic perspective view showing a typical example of a conventional general heat exchanger. FIG. 26 is a schematic plan sectional view for explaining the angle of the plate-like fin in the conventionally proposed heat sink.

  Embodiments of the present invention will be described below with reference to the drawings.

First, FIG. 3 to FIG. 5 show an example of a multilayer heat dissipation unit 60A (60B) used in the heat sink of the present invention.
In the multilayer heat dissipation unit 60A (60B), a large number of cuts 59 (see FIG. 5) along the vertical direction are provided on a single metal plate 51 with predetermined intervals, leaving the upper and lower edges 53 and 55. Are formed in parallel between the cuts 59, and a number of the belt-like zones 57 are alternately cut out to the opposite side of the plate surface. The plurality of belt-like zones 57 cut and raised on one side of the plate surface respectively constitute the plate-like metal portion 61 of the first fin layer F1, and the plurality of belt-like zones cut and raised on the other side of the plate surface 57 constitutes the plate-like metal portion 63 of the second fin layer F2. In the multilayer heat dissipation unit 60A (60B), the plate-like metal portion 61 of the first fin layer F1 and the plate-like metal portions 61 and 63 of the second fin layer F2 are the edges 53 of the single metal plate 51. , 55 as a common part, and the plate surface of the single metal plate 51 is cut (extruded).

6 and 7 show the heat sink of the first embodiment corresponding to the invention of claim 1 and corresponding to the first form as an arrangement form of the multilayer heat dissipating units .

6 and 7, the base plate 1 is one in which a heat generating component such as a semiconductor element, an integrated circuit, or a CPU (not shown) is thermally connected to the back side, and heat conduction such as aluminum, copper, or an alloy thereof. For example, the base plate 1 has a pair of multilayer heat radiation units 60A and 60B standing upright so as to form a V shape. Yes. These multilayer heat dissipation units 60A and 60B each have two fin layers, that is, a first fin layer F1 and a second fin, using a single metal plate, as shown in FIGS. A fin layer F2 is formed, and each of the fin layers F1 and F2 includes a plurality of plate-shaped metal portions (that is, fin plate portions) 61 and a plurality of opening hole portions (that is, slit portions) 63. It is comprised so that it may be arranged periodically alternately by making the direction parallel to the plate surface of a metal-like metal part into a periodic direction. The first of these, the second fin layer F1, F2 is arranged in parallel at a predetermined interval, a multilayered heat radiation unit 60A (or 60B) is formed. And, in this way, in the two multilayer heat dissipation units 60A, 60B each consisting of two fin layers F1, F2, the plate surface of the plate-like metal portion (fin plate portion) 61 is a surface perpendicular to the base plate 1, And the surface which the some plate-shaped part 61 makes is standingly arranged on the baseplate 1 so that V shape may be made. When two multilayer heat dissipating units 60A and 60B are arranged on the base plate 1 in this way, the V-shaped open side is the heat sink inlet 5 and the V-shaped closed side is the heat sink outlet 8 It is usually done.

  In the multilayer heat dissipating unit 60A (or 60B) configured as described above, the cooling fluid flowing in from the inlet portion 5 on one side on the base plate 1 is first the fin plate of the first fin layer F1 ( (Plate-shaped metal portion) 61 reaches the opening hole portion 62 while taking heat away from the plate surface (see FIG. 2), and between the first fin layer F1 and the second fin layer F2. While the space moves along the fin layers F1 and F2, that is, along the plate surfaces of the plate-like metal plate portions 61 and 63, the plate-like metal portion 61 and the second fin layer of the first fin layer F1. The plate-like metal plate portion 63 of F2 is contacted to reach the opening hole portion 64 of the second fin layer F2 while taking the heat, and passes through the opening hole portion 64 toward the outlet portion 8.

  At this time, the cooling fluid that reaches between the first fin layer F1 and the second fin layer F2 meanders between the first fin layer F1 and the second fin layer F2 and undulates between them several times. The movement along them is also added, thereby increasing the chance of contact between the cooling fluid and the fin plate, and the heat dissipation process proceeds effectively. The result of confirming this state by computer simulation when the cooling fluid is air will be described with reference to FIGS.

  In FIG. 8, (A) shows a plurality of sets of a pair of multilayer heat dissipation units (each composed of a first fin layer F1 and a second fin layer F2) 60A and 60B arranged in a V shape. 1 shows a configuration of a heat sink arranged on the base plate 1 so that an end of the letter-shaped opening side is in contact (this configuration will be described later in detail with reference to FIG. 12). A computer simulation was performed in which air was flown from the inlet 5 side as the cooling fluid, with the inlet 5 on the right and the outlet 8 on the left. FIG. 8B and FIG. 8C show the results of examining the air flow for one multilayer heat dissipating unit 60B surrounded by the chain line B in FIG. 8A at this time. Here, FIG. 8B shows an enlarged view of a portion surrounded by a chain line B in FIG. 8A, that is, a windward portion of the multilayer heat dissipation unit 60B, and FIG. The part surrounded by the chain line C in (A), that is, the part on the leeward side of the multilayer heat dissipation unit 60B is shown enlarged, and the flow of air is shown by a thick arrow.

  As shown in FIG. 8B and FIG. 8C, air flows between the first fin layer F1 and the second fin layer F2 in both the leeward portion B and the leeward portion C. It was confirmed that it was flowing along the plate surface.

Here, the plate-like metal portions 61 or 63 and the opening hole portions 62 or 64 that are alternately and periodically formed as the first fin layers F1 and the second fin layers F2 of the multilayer heat dissipation unit 60A (60B) are mutually connected. In order to arrange them so as to complement each other, the first fin layer F1 and the second fin layer F2 of the multilayer heat dissipation unit 60A (60B) are cut from the plate surface of the single metal plate 51 in which they are continuous as a whole. It is assumed that Specifically, as shown in FIGS. 3 to 5, this multi-layer heat-dissipating unit 60A (60B) includes a plate-shaped metal part 61 of the first fin layer F1 sheet metal of the second fin layer F2 portions 61 and 63, as a common part the edges 53, 55 of one metal plate 51, causing off the plate surface of the one metal plate 51 (pushing) have been prepared by.

  When the multilayer heat radiation unit 60A (60B) is manufactured in this way, the first and second fin layers F1 and F2 are simultaneously formed by cutting up (extrusion) from the plate surface of one metal plate. Therefore, it is easy to manufacture, and in the operation for assembling the heat sink, the first and second fin layers F1 and F2 do not need to be individually mounted on the base plate, and the assembling operation is facilitated.

Here, in the examples shown in FIGS. 3 to 5, the respective plate-like metal portions 61 of the first and second fin layers F <b> 1 and F <b> 2 are formed by extruding them on both sides of the plate surface of the single metal plate 51. , 63 travels to both sides of the base plate (both sides with respect to the surface including the edges 53 and 55 of the metal plate 51), but in some cases , as defined in claim 2 In addition, even if the plate surface is cut and raised only on one side of one metal plate 51, a plurality of first and second fin layers F1 and F2 are formed from one metal plate 51 as described above. A layered heat dissipation unit can be created. Examples of such cases are shown in FIGS.

  That is, in the multilayer heat dissipation unit shown in FIG. 9 and FIG. 10, a large number of cuts 59 along the vertical direction are formed on a single metal plate 51 at predetermined intervals in parallel, leaving the upper and lower edges 53 and 55. By forming, a belt-like zone is formed in parallel between the cuts 59, and a large number of the belt-like zones are pushed out on the other side of the plate surface, and one of the plate surfaces is formed. The plate-like metal portion 61 of the first fin layer F1 is constituted by a plurality of belt-like zones cut and raised on the side of the plate, and a plurality of belt-like zones (that is, upper and lower edges) remaining without being pushed out from the plate surface. The plate-like metal portion 63 of the second fin layer F2 is constituted by a band-like zone located on the same plane as the portions 53 and 55.

  9 and FIG. 10 also has the first and second fin layers F1 from the single metal plate 51 in the same manner as the multilayer heat dissipation unit shown in FIGS. , F2 can be created at the same time, so that the manufacture becomes easy and the heat sink assembly work becomes easy.

Hereinafter, further for embodying example a heat sink of the present invention will be described with reference to FIG. 1. 1 to FIG. 1 8.

First are those Figure 1 1 is showing the heat sink corresponding to the second embodiment, the arrangement of the multi-layer heat dissipating unit described as the first embodiment (see FIGS. 6 and 7), namely a pair of multilayered A configuration in which the V-shaped arrangement of the heat radiating units 60A and 60B is repeatedly connected in a direction perpendicular to the direction from the inlet portion 5 to the outlet portion 8 in a plane parallel to the plate surface of the base plate 1 without interruption. Show. According to such a configuration, a large number of multilayer heat dissipation units can be efficiently provided in a limited fixed space.

Meanwhile, 1 2, FIG. 1 3, for example, a single multi-layer heat dissipating unit 60A forming the fin layer F1, F2 of the two layers from one metal plate as shown in FIGS. 3 to 5 1 shows a heat sink that is erected on the base plate 1 in parallel with the direction from the inlet portion 5 toward the outlet portion 8. In this case, the first and second side wall plates 71A and 71B are provided at intervals on both sides of the single multilayer heat radiation unit 60A, and one of the inlet side end portions of the multilayer heat radiation unit 60A is provided. By providing first and second baffle plates 73A and 73B on the other side of the side and outlet side end portions, cooling fluid passages are defined on both sides of the multilayer heat dissipation unit 60A. ing. This example corresponds to the fourth and fifth embodiments , and the first side wall plate 71A and the first baffle plate 73A correspond to the first partition wall referred to in the fourth embodiment . The two side wall plates 71B and the second baffle plate 73B correspond to the second partition wall in the fourth embodiment .

Further in FIG. 1. 4, FIG. 1 3, the arrangement of the multi-layer heat dissipating unit shown in FIG. 1 4, a plurality of times in a direction perpendicular to the direction from the inlet 5 on the base plate 1 to the outlet portion 8 A repeated heat sink is shown.

This heat sink is a space sandwiched between adjacent multilayer heat dissipating units by arranging a plurality of multilayer heat dissipating units 60A in parallel at a predetermined interval in parallel with the direction from the inlet portion 5 to the outlet portion 8. Is used as a cooling fluid passage, and the cooling fluid passage includes baffle plates 73A or 73B for connecting adjacent end portions of the multilayer heat dissipating units between the end portions on the outlet portion 8 side. Alternatively, by alternately providing the end portions on the inlet portion 5 side, the opening direction of the cooling fluid passage is alternately switched between the inlet portion 5 side and the outlet portion 8 side. Incidentally side walls 71A for preventing the outflow of the cooling fluid to the side, it is provided with the 71B is 1 2, it is similar to the example of FIG. 1 3, also cross each multilayer heat dissipating unit 60A In order to partition the space, another side wall plate 71C is provided.

Further, in FIG. 1 5, on the base plate 1, a number of multi-layer type heat dissipation unit 60A from the inlet portion 5 in a direction perpendicular to the direction toward the outlet section 8 arranged in parallel form, layer multiple adjacent heat dissipating An example of a heat sink in which a space sandwiched between the units 60A is used as a cooling fluid passage, that is, an embodiment corresponding to the third mode will be described. In the heat sink shown in FIG. 15 , baffle plates 73A and 73B for connecting the ends of adjacent multilayer heat dissipation units 60A to each other are connected to the ends on the outlet 8 side or the ends on the inlet 5 side. They are provided alternately with each other so that the opening direction of the cooling fluid passage is alternately switched between the inlet portion 5 side and the outlet portion 8 side. Incidentally side walls 71A for preventing the outflow of the cooling fluid to the side, that 71B is provided on both sides of the whole is similar to the example of FIG 4.

With such a 1 5 to shown construction, similarly to the heat sink shown in FIG. 11 described above, in the constrained fixed spatial, provide multiple multilayered heat-dissipating unit efficient be able to.

In this case, the V-shaped arrangement of the multi-layer heat dissipating unit as shown in FIG. 1 1 described above, but is inevitable weakness that space of flow of the cooling fluid becomes narrower at the tip of the V, Figure 1 with 5-described configuration, it is possible to eliminate such weaknesses.

Further, FIGS. 16 and 17 show another example of the heat sink of the present invention, that is, an example corresponding to the fourth and sixth embodiments .

In the examples of FIGS. 16 and 17, a single multilayer heat radiation unit 60A similar to the above is erected on the base plate 1 in parallel with the direction from the inlet 5 to the outlet 8. Side wall plates 71D and 71E are arranged on both sides of the multilayer heat radiation unit 60A so as to form a V shape with respect to the multilayer heat radiation unit 60A. That is, the first partition referred to in the fourth embodiment is constituted by the side wall plate 71D provided in the space on the first fin layer F1 side of the multilayer heat dissipation unit 60A, and the first fin layer F1 side. In this space, the distance between the first fin layer F1 and the third side wall plate 71D gradually becomes narrower from the inlet portion 5 side toward the outlet portion 8 side, and the end of the heat dissipation unit on the outlet portion 8 side. In the fourth embodiment , the second partition wall is constituted by the side wall plate 71E provided in the space on the second fin layer F2 side of the heat dissipation unit, In addition, in the space on the second fin layer F2 side of the heat dissipation unit, the interval between the second fin layer F2 and the fourth side wall plate 71E is gradually narrowed from the outlet portion 8 side toward the inlet portion 5 side. Radiating unit on the inlet 5 side Outlet More 1 8 that both are configured to contact substantially in parts, Figure 1 6, the arrangement of the multi-layer heat dissipating unit shown in FIG. 1 7, the inlet 5 on the base plate 1 An example of a heat sink that is repeated a plurality of times in a direction perpendicular to the direction toward the portion 8, that is, a heat sink corresponding to the seventh embodiment will be described.

That is, in the heat sink shown in FIG. 18 , a plurality of multilayer heat radiation units 60A are arranged in parallel at predetermined intervals in a direction perpendicular to the direction from the inlet portion 5 to the outlet portion 8, and adjacent multilayer layers are formed. A space sandwiched between the heat radiating units is used as a V-shaped cooling fluid passage, and the side wall plates 71D to 71G on both sides of the multilayer heat radiating unit and between the adjacent multilayer heat radiating units, A cooling fluid passage is formed between the inlet side, the outlet side, and the intermediate multilayer heat dissipating unit of the multilayer heat dissipating unit on both ends. Also in this case, the side wall plates 71D to 71G are configured such that the opening direction of the cooling fluid passage is alternately switched between the inlet portion 5 side and the outlet portion 8 side.

Above, provisions have been described for each example, detailed shape of the multi-layer heat dissipating unit used to the heat sink of the present invention, not intended dimensions such that particularly limited, short in claim 1 or claim 2 As described above, the multilayer heat dissipating unit is configured such that the plate-shaped metal portions and the opening hole portions are alternately and periodically formed in a plane perpendicular to the base plate, with a direction parallel to the base plate as a periodic direction. The one fin layer and the second fin layer are arranged in parallel with each other at a predetermined distance between the layers, and the first fin layer and the second fin layer are continuous as a whole. A plurality of cuts along the vertical direction are formed in parallel with a predetermined interval on the single metal plate, leaving upper and lower edges. By each A belt-like zone is formed in parallel between the grooves, and a plurality of belt-like zones are alternately cut out on the opposite side of the plate surface, and a plurality of belt-like zones are cut up on one side of the plate surface. Each of the band-shaped zones constitutes a plate-shaped metal portion of the first fin layer, and each of the plurality of band-shaped zones cut and raised on the other side of the plate surface is a plate-shaped metal portion of the second fin layer. Or a plurality of belt-like zones that are cut and raised on one side of the plate surface every other side, and a plurality of belt-like zones cut and raised on one side of the plate surface, Each of the band-shaped metal portions of the first fin layer constitutes a plate-shaped metal portion of the first fin layer, and a plurality of band-like zones remaining without being pushed out from the plate surface constitute a plate-shaped metal portion of the second fin layer. and, further as a whole a heat sink, flows from the inlet The cooling fluid is introduced from the inlet portion to the opening hole portion of the first fin layer of the multilayer heat dissipation unit, and at least part of the cooling fluid passing through the opening hole portion is the first fin layer. The flow of the cooling fluid is guided between the layer and the second fin layer along the plate surface of the plate-like metal portion, and then led to the outlet portion from the opening hole portion of the second fin layer. It suffices if the configuration is such that it can be guided.

  In addition, when using such a heat sink for heat dissipation of electronic parts such as semiconductor elements and electrical parts, for example, as in the case of heat sinks of conventional heat sinks such as comb heat sinks, the part of the multilayer heat dissipation unit Needless to say, a cooling fluid such as air or LLC (Long Life Coolant) must be allowed to flow through. For this purpose, a cooling fluid drive source such as a fan or a pump for forcing a cooling fluid such as air to flow through the multilayer heat dissipation unit is used except for the case of natural air cooling where air flows by gravity. It is usually arranged upstream or downstream of the flow.

  In order to ensure that the cooling fluid flows through the heat sink portion having the multilayer heat dissipation unit, it is preferable that the flow path of the cooling fluid outside the heat sink is partitioned by a duct or the like. When the fan or pump is arranged upstream of the cooling fluid flow, the cooling fluid is not leaked out of the path, and the fan or pump is arranged downstream of the cooling fluid flow. In such a case, it is preferable that the fluid other than the cooling fluid is not mixed from outside the path. The place where these ducts and the like are arranged may be only upstream of the heat sink, only downstream, or both upstream and downstream.

  Similarly, it is preferable that a duct or the like is disposed so as to surround the heat sink having the multilayer heat dissipation unit in the heat sink portion having the multilayer heat dissipation unit. In that case, at least the open part above the multilayer heat dissipation unit must be covered, and as its specific structure, the cover is joined and integrated with the upper end of the multilayer heat dissipation unit. But it doesn't matter. Further, the cover may be a separate part or an integral part of a duct or the like disposed only on the upstream side, only the downstream side, or both upstream and downstream of the heat sink.

  In general, it is not necessary to ensure that the cooling fluid flows through the heat radiating fins (in the case of the present invention, the multi-layered heat radiating unit). This also applies to certain heat sinks.

1 Base plate 5 Inlet part 8 Outlet part 51 Metal plate 53, 55 Edge part 59 Cut 57 Belt-like zone
60A, 60B Multi-layer type heat radiation unit 61, 63 Plate-shaped metal part 62, 64 Opening hole part 71A-71G Side wall plate 73, 73A, 73B Baffle plate F1 First fin layer F2 Second fin layer

Claims (2)

In a heat sink in which a heat radiating unit for performing heat transfer to a cooling fluid is provided in a state of being thermally connected to the base plate on a base plate to which a heat generating component is thermally connected,
An inlet portion through which the cooling fluid flows in and an outlet portion through which the cooling fluid flows out;
The heat dissipating unit includes a first fin layer and a second fin layer formed by alternately and periodically forming a plate-like metal portion and an opening hole portion in a plane perpendicular to the base plate with a direction parallel to the base plate as a periodic direction. The fin layer is composed of a multilayer heat dissipating unit that is arranged in parallel with a predetermined distance between those layers,
The first fin layer and the second fin layer of the multilayer heat dissipating unit are cut and raised from one continuous metal plate as a whole. A plurality of cuts along the vertical direction are formed in parallel with a predetermined interval so as to leave the edge of the band, and a band-like zone is formed in parallel between each cut, and the plurality of band-like zones are alternately formed. A plurality of belt-like zones cut and raised on the opposite side of the plate surface and formed on one side of the plate surface each constitute a plate-like metal portion of the first fin layer, and the plate surface A plurality of belt-like zones cut and raised on the other side of each of the plate-shaped metal portions of the second fin layer,
As a configuration of the entire heat sink, the cooling fluid that has flowed in from the inlet portion is led from the inlet portion to the opening hole portion of the first fin layer of the multilayer heat dissipation unit, and cooled through the opening hole portion. After at least a part of the working fluid moves between the first fin layer and the second fin layer along the plate surface of the plate-like metal portion, the outlet from the opening hole portion of the second fin layer A heat sink using a multilayer heat radiating unit, characterized in that it is configured to induce a flow of a cooling fluid so as to be guided to the section. In a heat sink in which a heat radiating unit for performing heat transfer to a cooling fluid is provided in a state of being thermally connected to the base plate on a base plate to which a heat generating component is thermally connected,
An inlet portion through which the cooling fluid flows in and an outlet portion through which the cooling fluid flows out;
The heat dissipating unit includes a first fin layer and a second fin layer formed by alternately and periodically forming a plate-like metal portion and an opening hole portion in a plane perpendicular to the base plate with a direction parallel to the base plate as a periodic direction. The fin layer is composed of a multilayer heat dissipating unit that is arranged in parallel with a predetermined distance between those layers,
The first fin layer and the second fin layer of the multilayer heat dissipating unit are composed of a single continuous metal plate as a whole, and the upper and lower edges of the single metal plate A plurality of cuts along the vertical direction are formed in parallel with a predetermined interval, so that a band-like zone is formed in parallel between the cuts. A plurality of belt-like zones cut and raised on one side of the surface and formed on one side of the plate surface each constitute a plate-like metal portion of the first fin layer, and a plate A plurality of band-like zones that remain without being extruded from the surface constitute a plate-like metal portion of the second fin layer,
As a configuration of the entire heat sink, the cooling fluid that has flowed in from the inlet portion is led from the inlet portion to the opening hole portion of the first fin layer of the multilayer heat dissipation unit, and cooled through the opening hole portion. After at least a part of the working fluid moves between the first fin layer and the second fin layer along the plate surface of the plate-like metal portion, the outlet from the opening hole portion of the second fin layer A heat sink using a multilayer heat radiating unit, characterized in that it is configured to induce a flow of a cooling fluid so as to be guided to the section.

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