JP2011119555A - Heat sink using bent louver-like heat dissipation unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat sink capable of improving cooling efficiency. <P>SOLUTION: A heat sink (100A) includes a base plate (11) to which a heat generation unit (12) is thermally connected, a plurality of bent metal plates (10A) formed by being bent and arranged over the base plate in parallel therewith and thermally connected to the base plate, an inlet (13a) on one of ends of the base plate into which a cooling fluid (CF) flows, and an outlet (13b) on the other end of the base plate from which the cooling fluid flows out. Then, gaps between the number of the bent metal plates (10A) and the neighboring bent metal plates form cooling fluid paths (15), respectively, and the cooling fluid flows from the inlet (13a) into an inter-plate path inlet (14a) formed by neighboring bent metal plates, flows through a cooling fluid path (15) formed by neighboring bent metal plates, and flows to the outlet (13b) from an inter-plate path outlet (14b) formed by neighboring bent metal plates. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat sink 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. In such a heat sink, a base plate 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. The most well-known one is that a large number of long plate-like radiating fins made of a metal having a high thermal conductivity are installed on the base plate in parallel with the flow direction of the cooling fluid. These are so-called comb heat sinks that constitute a heat sink as a whole.

  As a method for manufacturing such a heat sink, since a method of integrally forming the base plate and the heat radiating fins by extrusion is advantageous from the viewpoint of cost, it has been widely applied conventionally. Further, a method of manufacturing the base plate and the heat radiating fins separately and joining them is also applied.

  When such a heat sink is actually used, for example, air is blown as a cooling fluid from one end of the heat sink along the upper surface of the base plate and in the direction along the longitudinal direction of the heat radiating fins. Air flows between the fins. Therefore, the fin surface is cooled by surface contact while the air flow passes through the fluid passage, and thereby, heat transferred from the heat generating component to the plate-like heat radiation fin via the base plate is radiated to the atmosphere.

  By the way, in such a conventional comb heat sink, the length of the plate-shaped heat radiation fins (the length in the direction from the windward side of the cooling air toward the leeward side) is long, or the adjacent plate-shaped heat radiation fins are mutually connected. If the interval between them is small, cold air comes into contact with the surface of the windward side of the radiating fin. However, the temperature of the air in contact with the leeward portion of the radiating fin has already risen. For this reason, not only a sufficient heat dissipation effect cannot be obtained as a whole, but in particular, there is a problem that heat dissipation of a heat-generating component that is thermally connected in the vicinity of the leeward side of the radiating fin in the base plate is not sufficiently performed. is there.

  Here, it is conceivable that a large amount of cooling air is allowed to flow at a high speed in order to increase the interval between the radiation fins and to improve the cooling efficiency. However, in this case, the air only passes through the central portion between adjacent radiating fins at high speed, and heat exchange is not sufficiently performed.

  Thus, in the conventional heat sink, a sufficient heat dissipation effect cannot be obtained, and in particular, when a large number of heat generating components arranged in the vertical depth are cooled, the heat generating components on the leeward side cannot be effectively cooled.

  In order to solve the above problems, a heat sink as shown in Patent Document 1 has already been proposed. The heat sink disclosed in Patent Document 1 reduces the flow velocity of cooling air flowing between a plurality of plate-like heat dissipating fins, so that a temperature boundary layer (that is, when the cooling air flow passes between the fins). In addition, it is formed in the part of the air flow that rises in temperature as it flows in contact with the surface of the radiating fin and the heat is transmitted, and the part of the air flow that is away from the surface of the radiating fin that is not affected by the heat of the radiating fin. The boundary is overlapped. In Patent Document 1, the surface temperature of the plate-like heat radiation fins of the heat sink is averagely close to the temperature on the leeward side (heat sink outlet side).

  Further, in Patent Document 1, a fin portion is formed by arranging a large number of plate-like fins in parallel at predetermined intervals on a base plate to which at least one heat generating component is thermally connected and the base plate portion. Further, the two fin portions are arranged in a “C” shape with respect to the inlet portion, and a fin group including a pair of fin portions is formed. The “C” shape is arranged so as to gradually narrow from the inlet portion toward the discharge port along the cooling air (high speed). The plate-like fins at the top of the “C” shape are arranged so as to contact each other. The interval between the adjacent plate fins is closed, and the flow of cooling air is guided to the plate fins.

  According to the proposed invention of Patent Document 1, a heat sink that has a high cooling capacity with the same envelope volume and that has excellent heat dissipation efficiency without causing a temperature difference in the leeward and leeward direction (that is, cold air is in contact with the fins even on the leeward side). Obtainable.

JP 2008-205421 A

  As described above, the heat sink proposed in Patent Document 1 is excellent in cooling performance, but due to its spatial limitation, the length of the cooling fluid passage in the radiating fin as compared to the conventional heat sink, that is, a plate shape The length of the gap between the fins and the adjacent plate fins must be short.

  Further, in the heat sink proposed in Patent Document 1, in order to compensate for the decrease in cooling efficiency by shortening the length of the cooling fluid passage in the radiating fin, the interval between the radiating fins may be reduced to some extent. It is necessary.

  Further, the heat sink is used in an environment where the cooling fluid (for example, air) is not always clean (for example, an application used in an automobile). Under such an environment, if the distance between the radiating fins is narrow, dust is clogged there, causing a serious problem that the performance of the heat sink is impaired.

  For this reason, also in the heat sink proposed by patent document 1, it is earnestly desired that the space | interval between radiation fins should be made large to some extent. However, simply increasing the distance as described above increases the proportion of the cooling fluid (for example, air) that passes through the central portion between adjacent radiating fins at high speed, and heat exchange is not sufficiently performed. As a whole, the cooling efficiency decreases.

  An object of the present invention is to provide a heat sink that has an excellent heat exchange efficiency and can exhibit a sufficient heat radiation effect even if the interval between the radiation fins is widened.

  First, in the heat sink in which the pair of fin portions proposed in Patent Document 1 is arranged in a “C” shape, the “C” -shaped tip (arranged so that the “C” -shaped tips are in contact with each other) When this is done, it is more appropriate to refer to the “V” shape rather than the “C” shape. V ”-shaped.) The effect of the opening angle of the fin arrangement, that is, the angle formed by the two fins constituting the“ V ”-shaped, on the cooling efficiency of the heat sink is as follows. is there.

  That is, in the “V” -shaped fin arrangement, the smaller the angle, the larger the number of fin portions that can be provided on a certain width of the base plate. In order to increase the cooling efficiency of the heat sink, it is preferable to have as many fins as possible in a predetermined range of space.

  However, when the angle of the “V” shape is reduced, the region sandwiched between the fin portions on both sides (that is, from the inlet portion to the fin portion or after passing through the fin portion, heads from the fin portion to the discharge port). The cooling air passage is gradually becoming narrower.

  In order to increase the cooling efficiency of the heat sink, it is preferable to reduce the “V” -shaped angle so that as many fins as possible can exist within a predetermined width of the base plate. However, if the passage of the cooling air becomes too narrow by reducing the “V” -shaped angle, the cooling efficiency decreases.

  For this reason, there is an urgent need for a measure that can secure a wider passage of cooling air even if the "V" -shaped angle is reduced. For that purpose, the “width” of the fin portion should be made thinner. That is, in order to realize a heat sink with good cooling efficiency in the “V” -shaped fin arrangement, it is important to reduce the “V” -shaped angle and simultaneously reduce the “width” of the fin portion.

  In the present invention, instead of the plate-like heat radiation fins arranged in parallel in Patent Document 1, they are replaced with a bent louver-like heat radiation unit, thereby solving the above-mentioned problems. The bent louver-like heat radiating unit means that a large number of metal plates thermally connected to the base plate as plate-like radiating fins are arranged in parallel above the base plate, and a gap between adjacent louver-like metal plates. Are the cooling fluid passages. The louver-like metal plate is bent into a bent louver-like metal plate, whereby the cooling fluid passage is bent. An important point in this configuration is that the cooling fluid passage is not straight but bent.

  With such a configuration, it is possible to ensure a long cooling fluid passage even when the “width” of the heat dissipation unit is limited to a predetermined size or less. In addition, since the cooling fluid passage is lengthened, the time during which the cooling fluid is in contact with the surface of the bent louver-like metal plate as the radiation fin is lengthened. As a result, the heat transmitted from the heat generating component to the bent louver-like metal plate via the base plate is easily radiated to the cooling fluid, and the cooling efficiency is improved.

  The fact that the “width” of the heat dissipation unit can be reduced is particularly significant when the “V” -shaped angle is reduced in a heat sink in which the heat dissipation unit is arranged in a “V” shape (“C” shape). Have.

  Further, with such a configuration, the cooling fluid passage is bent, so that the cooling fluid is disturbed in a laminar flow state, and some agitation occurs in the flow. The ratio of the cooling fluid that passes through only the central portion of the gap between the heat radiating fin metal plates at a high speed and does not contact the surface of the heat radiating fin metal plate is reduced. Since a larger proportion of the cooling fluid comes into contact with the surface of the radiating fin metal plate, the cooling efficiency is improved as a whole.

  A heat sink according to a first aspect of the present invention includes a base plate to which heat-generating components are thermally connected, a number of bent metal plates that are arranged in parallel above the base plate and are thermally connected to the base plate, and The heat sink includes an inlet portion into which the cooling fluid on one end side of the base plate flows in and an outlet portion from which the cooling fluid on the other end side of the base plate flows out. And the space | gap between many bent metal plates arrange | positioned in parallel and the bent metal plate adjacent to it becomes a cooling fluid channel | path, and the cooling fluid was comprised by the bent metal plates adjacent from the inlet part. It flows into the inter-plate passage inlet, flows through the cooling fluid passage constituted by the adjacent bent metal plates, and flows from the inter-plate passage outlet constituted by the adjacent bent metal plates to the outlet portion. Here, the cooling fluid flows while being bent in the cooling fluid passage.

  In the heat sink of the second aspect, a large number of the bent metal plates form a single heat dissipating unit aligned as a whole, and the heat dissipating unit includes a large number of bent metal plates and a plurality of inter-plate passage inlets and inter-plate passage outlets. Is provided. Then, the cooling fluid flows from the inlet portion into the surface where the many inter-plate passage inlets are arranged, passes through the cooling fluid passage, and then flows out from the surface where the many inter-plate passage outlets are arranged.

  In the heat sink according to the third aspect, the heat dissipation unit has a frame body connected to a large number of bent metal plates.

  In the heat sink of the fourth aspect, two heat radiating units are arranged, and the two heat radiating units are arranged in a V shape so that the interval between the two heat radiating units becomes narrower from the inflow portion inlet portion side toward the outflow portion outlet portion side.

  In the heat sink of the fifth aspect, a large number of V-shaped heat dissipating units are repeatedly arranged, and adjacent heat dissipating units of adjacent V-shaped dispositions become wider from the inlet side toward the outlet side.

  In the heat sink of the sixth aspect, the angle formed by the heat dissipating unit arranged in a V shape so as to become narrower from the inlet side toward the outlet side is within 20 °, preferably within 10 °, more preferably 5 °. Is within.

  In the heat sink of the seventh aspect, the angle formed by the adjacent heat dissipating units in the V-shaped arrangement arranged so as to widen from the inlet side to the outlet side is within 20 °, preferably within 10 °, Preferably, it is within 5 °.

  In the heat sink of the eighth aspect, a large number of bent metal plates are formed from a single metal plate material, and the metal plate material has a shape that is cut and raised toward both surfaces thereof.

  In the heat sink according to the ninth aspect, the large number of bent metal plates are formed of two metal plate materials, and the two metal plate materials have the same shape and are raised toward one surface of the metal plate material.

  In the heat sink according to the tenth aspect, a large number of bent metal plates are constituted by two metal plate materials, one metal plate material is cut up toward one surface, and another metal plate material has a large number of holes on the surface. Have.

  In the heat sink according to the eleventh aspect, the cross section of the bent metal plate has a shape bent into a number of straight lines.

  In the heat sink of the twelfth aspect, the cross section of the bent metal plate has a “Z” shape bent in three straight lines.

  In the heat sink of the thirteenth aspect, the cross section of the bent metal plate has a shape in which several portions are curved in an arc shape.

  In the heat sink of the fourteenth aspect, the cross section of the bent metal plate has an “S” shape in which two portions are curved in an arc shape.

  In the heat sink of the fifteenth aspect, a first partition is provided on the surface where a large number of inter-plate passage inlets of the heat radiating unit are arranged so that the cooling fluid does not flow out, and the heat radiating unit of the heat radiating unit is prevented from flowing in. A 2nd partition is provided in the surface where many board passage exits are located in a line.

  In the heat sink according to the sixteenth aspect, the first partition wall is provided on the side where the first side wall plate which is separated from the heat dissipation unit and is parallel to the surface where the inter-plate passage entrances are arranged, and the side where many inter-plate passage entrances of the heat dissipation unit are arranged. The first baffle plate connecting the end portion of the heat radiating unit on the outlet side and the first side wall plate, the second partition wall being away from the heat radiating unit and parallel to the surface where the passage exits between the plates are arranged. 2 side wall plates, and the 2nd baffle plate which is provided in the side where many board passage exits of a heat sink unit are located in a line, and connects the end of the heat sink unit by the side of an entrance, and the 2nd side wall plate.

  In the heat sink of the seventeenth aspect, the first partition includes a third side wall plate provided on a side where a large number of inter-plate passage inlets of the heat radiating unit are arranged, and the distance between the heat radiating unit and the third side wall plate is from the inlet side. The second partition wall includes a fourth side wall plate provided on a side where a large number of inter-plate passage outlets of the heat radiating unit are arranged side by side, and the second partition wall is formed between the heat radiating unit and the fourth side wall plate. The interval is configured to become narrower from the outlet side toward the inlet side.

  In the heat sink according to the eighteenth aspect, the heat dissipation unit, the first partition, and the second partition are arranged so as to repeat many times on the base plate.

The present invention makes it possible to lengthen the cooling fluid passage even when the “width” of the heat radiating unit is narrowed, thereby improving the cooling efficiency of the heat sink.
In addition, a large number of metal plates thermally connected to the base plate as plate-like radiating fins are arranged in parallel above the base plate, so that a cooling fluid formed between adjacent similar louver-like metal plates. The gap of the passage can be expanded without greatly reducing the cooling efficiency of the heat sink. For this reason, it is possible to prevent a serious trouble that the gap is clogged with dust and the performance of the heat sink is impaired.

  Further, since the cooling fluid passage is bent, the cooling fluid is disturbed in the laminar flow state, and a certain amount of stirring occurs in the flow. Therefore, only the central portion between the adjacent radiating fin metal plates is high-speed. The proportion of cooling fluid that passes through is reduced. Since a larger proportion of the cooling fluid comes into contact with the radiating fin metal plate, the cooling efficiency of the heat sink can be improved as a whole.

It is a perspective view of the 1st heat sink 100A. It is a top view of the 1st heat sink 100A. It is a perspective view of the 2nd heat sink 100B. It is a top view of the 2nd heat sink 100B. It is a top view of the 3rd heat sink 100C. It is a top view of 4th heat sink 100D. It is a perspective view of 4th bending louver-like heat radiation unit 20Da of 4th heat sink 100D. It is a figure for demonstrating the case where 4th bending louver-like heat radiating unit 20D is formed with two metal plate materials. It is a top view of the 5th heat sink 100E. It is a perspective view of the 6th heat sink 100F. It is a top view of the 6th heat sink 100F. It is a top view of the 7th heat sink 100G. It is a top view of the 8th heat sink 100H. It is a top view of the 9th heat sink 100J.

(First embodiment)
<Configuration of the first heat sink 100A>
FIG. 1 is a perspective view of the first heat sink 100A of the first embodiment. Here, the surface of the base plate part 11 is an XY plane, and the direction perpendicular to the base plate part 11 is a Z-axis direction.

  As shown in FIG. 1, the first heat sink 100A is attached to a heat generating component 12 such as a power transistor or an integrated circuit such as an LSI. Although the heat generating component 12 is drawn larger than the base plate portion 11 to help understanding, there are cases where the heat generating component 12 is actually smaller than the base plate portion 11. In addition, a plurality of small heat generating components 12 may be thermally connected to the back side of the base plate portion 11. The heat generating component 12 is not attached to the first heat sink 100A. The first heat sink 100A has a base plate portion 11 extending in the XY plane and a first bent louver-like heat radiation unit 20A. The base plate portion 11 is placed in close contact with the XY plane of the heat generating component 12. The first bent louver-like heat radiation unit 20A is composed of a plurality of first bent metal plates 10A. These first bent metal plates 10 </ b> A are connected perpendicularly to the base plate portion 11.

  The first bent metal plate 10A is formed by bending one metal plate material into a three-stage metal flat plate. Here, the first bent metal plate 10 </ b> A has a suitable shape that can easily cope with a request to reduce the width W <b> 1 of the first bent louver-like heat radiation unit 20 </ b> A. Further, since the first bent metal plate 10A is directly connected to the base plate portion 11, the first bent louver-like heat radiation unit 20A and the base plate portion 11 are in a thermally connected state. Thereby, the heat from the heat generating component 12 is transmitted to the first bent louver-like heat radiating unit 20 </ b> A via the base plate portion 11. Further, the first bent louver-like heat radiating unit 20A in the first embodiment is composed of four first bent metal plates 10A for easy understanding of the description, but actually hundreds or thousands of first bent metals are formed. It is comprised by the board 10A.

  In addition, a connection method for thermally connecting the first bent metal plate 10A to the base plate portion 11 is not particularly limited. For example, a fixing method such as brazing, soldering, or adhesion can be applied. The connecting method may be a means in which a groove is formed in advance on the plate surface of the base plate portion 11, and the edge of the first bent metal plate 10A is inserted into the groove to perform brazing, soldering, bonding, or the like. Further, the connection method may be a method by press-fitting the edge of the first bent metal plate 10A into the groove, mechanical caulking, or the like. Of course, a fixing method using these methods together may be used.

  In the case of joining by brazing, a brazing material may be disposed near the joining portion and brazed as a separate member from the first bent metal plate 10A, or the brazing material and the core material are clad and integrated. You may braze using what is called a brazing sheet. Further, when a groove is formed on the base plate portion 11 and the edge portion of the first bent metal plate 10A is inserted and fixed by press-fitting or mechanical caulking, heat conduction grease or the like may be used together.

  The first bent metal plate 10A has a rectangular plate shape with a thickness H (see FIG. 2) of about 0.4 mm to 0.8 mm, for example, and has good thermal conductivity such as aluminum, copper, and alloys thereof. Consists of materials. The first bent metal plate 10A can be easily formed by a mold, for example.

  The base plate portion 11 is made of a material having good thermal conductivity such as aluminum, copper, or an alloy thereof having a thickness of about 0.8 mm, and is made into a square plate shape of 50 mm square according to the heat-generating component 12, for example. ing.

Hereinafter, the first bent louver-like heat radiation unit 20A will be described with reference to FIG.
FIG. 2 is a plan view of the first heat sink 100A of the first embodiment. As shown in FIG. 2, the four first bent metal plates 10A of the first bent louver-like heat radiating unit 20A are arranged with a constant interval in the X-axis direction. An inlet portion 13 a into which the cooling fluid CF flows is formed on the + Y side of the base plate portion 11, and an inlet portion 13 b from which the cooling fluid CF flows out is formed on the −Y side of the base plate portion 11. Further, the inlet portion 13a includes an inter-plate passage inlet 14a constituted by two adjacent first bent metal plates 10A, and the inlet portion 13b is constituted by two adjacent first bent metal plates 10A. The inter-plate passage outlet 14b is included. Further, a cooling fluid passage 15A through which the cooling fluid CF flows is formed between the pair of corresponding inter-plate passage inlets 14a and inter-plate passage outlets 14b. In FIG. 2, the inter-plate passage inlets 14a are arranged in the X-axis direction, and the inter-plate passage outlets 14b are also arranged in the X-axis direction.

  As shown in FIG. 2, the first bent metal plate 10A includes a first metal flat plate portion 10Aa, a second metal flat plate portion 10Ab, and a third metal flat plate portion 10Ac. The first metal flat plate portion 10Aa and the second metal flat plate portion 10Ab are set to an angle α1, and the second metal flat plate portion 10Ab and the third metal flat plate portion 10Ac are set to an angle α2.

  Since the first bent metal plate 10A is arranged in parallel along the X-axis, the first bent metal plate 10A is formed by the flat surface formed by the inter-plate passage inlets 14a of the first bent louver-like heat radiation unit 20A and the inter-plate passage outlets 14b. The flat plane is the XZ plane. That is, the XZ plane formed by the first metal flat plate portion 10Aa and each inter-plate passage inlet 14a is disposed at an angle γ1, and the XZ plane formed by the third metal flat plate portion 10Ac and each inter-plate passage outlet 14b. Is arranged at an angle γ2.

  The angle α1 and the angle α2 of the first bent metal plate 10A may be equal to or different from each other. That is, 1st metal flat plate part 10Aa and 3rd metal flat plate part 10Ac may be parallel, and do not need to be parallel. However, the angle α1 and the angle α2 are 90 ° or more (that is, the shape that is stretched in the lateral direction so that the “Z” shape is unraveled) rather than the acute angle. It is better harmonized with the flow and is preferred.

  Moreover, when the angle α1 or the angle α2 is close to 90 °, the stirring effect of the cooling fluid CF is easily generated, and a larger proportion of the cooling fluid CF can be brought into contact with the surface of the first bent metal plate 10A. However, when the angle α1 or the angle α2 is close to 90 °, the shape of the gap between the adjacent adjacent first bent metal plates 10A becomes angular, so the flow of the cooling fluid CF does not flow smoothly, and the pressure In some cases, a loss may easily occur.

  On the other hand, if the angle α1 or the angle α2 is larger than 160 °, the cooling fluid passage that can be secured within the predetermined width W1 of the bent louver-like heat radiating unit cannot be made so long, so the angles α1 and α2 are made 160 ° or less. It is preferable.

  When the angle α1 and the angle α2 are 110 ° to 140 °, an appropriate stirring effect of the cooling fluid CF can be generated, the flow of the cooling fluid CF is smooth, and the predetermined width W1 of the heat radiating unit. The cooling fluid passage 15A that can be secured in the inside can be made correspondingly long and is often particularly suitable. Therefore, in the first bent metal plate 10A of the first embodiment, the angle α1 and the angle α2 are the same 120 °.

  Hereinafter, the inflow angle and the outflow angle of each cooling fluid passage in the first bent louver-like heat radiation unit 20A will be described. That is, the angle γ1 between the first metal flat plate portion 10Aa shown in FIG. 2 and the XZ plane formed by each inter-plate passage inlet 14a, the XZ plane formed by each inter-plate passage outlet 14b, and the third metal flat plate portion. A suitable range of the angle γ2 with 10Ac is 0 ° to 90 °. That is, from the state where the first metal flat plate portion 10Aa is parallel to the XZ plane formed by each inter-plate passage inlet 14a, or the third metal flat plate portion 10Ac is parallel to the XZ plane formed by each inter-plate passage outlet 14b, The first metal flat plate portion 10Aa is perpendicular to the XZ plane formed by each inter-plate passage inlet 14a, or the third metal flat plate portion 10Ac is perpendicular to the XZ plane formed by each inter-plate passage outlet 14b.

  When these angles γ1 and γ2 are shallow (that is, 0 ° to 30 °), the cooling fluid passage that can be secured within the predetermined width W1 of the first bent louver-like heat radiation unit 20A is designed to be long. It becomes easy. When these angles γ1 and γ2 are somewhat large (that is, 30 ° or more and 70 ° or less), the cooling fluid flows smoothly into each cooling fluid passage in the bent louver-like heat radiation unit.

  Here, in the first bent louver-like heat radiation unit 20A, the angle γ1 and the angle γ2 may be the same or different.

  Further, the lengths of the first metal flat plate portion 10Aa, the second metal flat plate portion 10Ab, and the third metal flat plate portion 10Ac of the first bent metal plate 10A are not particularly limited. That is, the first metal flat plate portion 10Aa, the second metal flat plate portion 10Ab, and the third metal flat plate portion 10Ac may have the same length, may be different from each other, or may be longer. However, since the contact area with the cooling fluid CF increases as the length of each metal flat plate portion increases, the cooling efficiency remains high even if the distance between the adjacent first bent metal plates 10A increases. is there.

  In the first embodiment, the angles α1 and α2 are both 120 °, the angles γ1 and γ2 are both 0 °, the Y-axis width W1 is 3.1 mm, and the first bent metal plates 10A are 6 mm apart. It is particularly preferable to arrange with the peach. As a result, the cooling fluid CF is disturbed in the laminar flow state, and some agitation occurs in the flow. For this reason, only the central portion of the cooling fluid passage 15A passes through at a high speed, and the ratio of the cooling fluid CF that does not contact the surface of the first bent metal plate 10A decreases. Since a larger proportion of the cooling fluid CF comes into contact with the surface of the first bent metal plate 10A, the cooling efficiency is improved as a whole.

  Further, in the first embodiment, the first bent metal plate 10A configured by three metal flat plate portions is formed by bending one metal plate material at two locations. It should be within the place. Furthermore, it is more excellent to bend within 6 places (see the second embodiment).

<Heat exchange operation by the first heat sink 100A>
Next, the heat exchange operation by the first heat sink 100A will be described with reference to FIG. The cooling fluid CF flows from the external air cooling fan (not shown) into the inlet portion 13a of the first heat sink 100A along the −Y axis direction. The cooling fluid CF flows into the cooling fluid passage 15A from each inter-plate passage inlet 14a. Since the cooling fluid passage 15A is composed of adjacent first bent metal plates 10A, the cooling fluid CF flowing into the cooling fluid passage 15A meanders in accordance with the shape of the first bent metal plate 10A. It flows like. The cooling fluid CF that has passed through the cooling fluid passage 15A exits from each inter-plate passage outlet 14b and flows out of the first heat sink 100A from the outlet portion 13b.

  Since the cooling fluid passage 15A configured by the first bent metal plate 10A is bent, the laminar flow state of the cooling fluid CF is disturbed, and some agitation occurs in the flow. Therefore, only the central portion of the cooling fluid passage 15A passes through at a high speed, and the ratio of the cooling fluid CF that does not contact the surface of the first bent metal plate 10A decreases. Since a larger proportion of the cooling fluid CF comes into contact with the surface of the first bent metal plate 10A, the cooling efficiency is improved as a whole.

(Second Embodiment)
<Configuration of Second Heat Sink 100B>
FIG. 3 is a perspective view of the second heat sink 100B of the second embodiment, and FIG. 4 is a plan view of the second heat sink 100B of the second embodiment.

  In the second embodiment, the second bent louver-like heat radiating unit 20 </ b> B includes a plurality of second bent metal plates 10 </ b> B connected perpendicularly to the base plate portion 11. The second bent metal plate 10B has seven metal flat plate portions (bent at six locations), and has a staircase shape when viewed from the + Z side. That is, in the second embodiment, the metal flat plate portion of the second bent metal plate 10B is a case where α1 and α2 are 90 ° and γ1 and γ2 are 0 °. The width W2 of the second bent louver-like heat radiation unit 20B is further narrowed. The same constituent elements as those in the first embodiment will be described with the same reference numerals.

  The four second bent metal plates 10B shown in FIG. 3 or FIG. 4 are arranged at a constant interval in the X-axis direction. An inlet portion 13 a into which the cooling fluid CF flows is formed on the + Y side of the base plate portion 11, and an inlet portion 13 b from which the cooling fluid CF flows out is formed on the −Y side of the base plate portion 11. In addition, the inlet portion 13a includes an inter-plate passage inlet 14a constituted by two adjacent second bent metal plates 10B, and the inlet portion 13b is constituted by two adjacent second bent metal plates 10B. The inter-plate passage outlet 14b is included. Further, a cooling fluid passage 15B through which the cooling fluid CF flows is formed between the pair of corresponding inter-plate passage inlets 14a and inter-plate passage outlets 14b.

  In the second embodiment, the laminar flow state of the cooling fluid CF is disturbed many times, and some agitation occurs in the flow. Therefore, only the central portion of the cooling fluid passage 15B passes through at high speed. The ratio of the cooling fluid CF that does not contact the surface of the second bent metal plate 10B is reduced. Since a larger proportion of the cooling fluid CF comes into contact with the surface of the second bent metal plate 10B, the cooling efficiency is improved as a whole.

  Since the heat exchange operation by the second heat sink 100B is the same as that of the first embodiment, the description thereof is omitted.

(Third embodiment)
<Configuration of Third Heat Sink 100C>
FIG. 5 is a plan view of a third heat sink 100C of the third embodiment.
In the first embodiment and the second embodiment, a bent metal plate is formed by bending a single metal plate material in a straight line at several locations. The third bent metal plate 10C of the third embodiment has an “S” shape formed by curving one metal plate material in a curved shape at four locations. The third bent louver-like heat dissipation unit 20 </ b> C is configured by a plurality of third bent metal plates 10 </ b> C connected perpendicularly to the base plate portion 11. The third bent metal plate 10 </ b> C has a suitable shape that can easily meet the demand for reducing the width W <b> 3 of the third bent louver-like heat radiation unit 20 </ b> C.

  The inlet angle γ1 on the inlet portion 13a side and the outlet angle γ2 on the outlet portion 13b side of the third bent louver-like heat radiation unit 20C may be configured as described in the first embodiment.

  Further, the third bent louver-like heat radiation unit 20C has an advantage that the flow of the cooling fluid CF is smoother than those of the first and second embodiments. On the other hand, the stirring effect of the cooling fluid CF is narrower than in the first and second embodiments.

  Further, when the third bent metal plate 10C is manufactured, how much the curvature is to be determined depends on the design conditions of the heat sink, for example, the initial inflow speed of the cooling fluid CF, and each cooling of the bent louver-like heat radiating unit. It is determined in consideration of restrictions related to the gap of the fluid passage and other various conditions.

  Further, the heat exchanging operation by the third heat sink 100C is the same as that of the first embodiment, and thus the description thereof is omitted.

(Fourth embodiment)
<Configuration of Fourth Heat Sink 100D>
FIG. 6 is a plan view of a fourth heat sink 100D of the fourth embodiment. FIG. 7 is a perspective view of the fourth bent louver-like heat radiation unit 20D of the fourth heat sink 100D. Further, the direction in which the inter-plate passage inlets 14a formed by the fourth bent louver-like heat radiation unit 20D are arranged is indicated by the X ′ axis, and the direction orthogonal to the X ′ axis is indicated by the Y ′ axis. The same constituent elements as those in the first embodiment will be described with the same reference numerals.

  In the first, second, and third embodiments, four bent metal plates are formed by bending four individual metal plate members. In 4th Embodiment, it has the flame | frame part 16 which connects five 4th bending metal plates 10D and the 5th 4 bending metal plates 10D by pressing one big metal plate material with a press machine not shown. A fourth bent louver-like heat radiation unit 20D is formed.

  In the fourth embodiment, the five fourth bent metal plates 10D have the same shape as the first bent metal plate 10A described in the first embodiment. The bending angles α1 and α2 of the fourth bent metal plate 10D and the angles γ1 and γ2 with respect to the X ′ axis are the same as those in the first embodiment.

  The fourth heat sink 100D of the fourth embodiment is composed of two fourth bent louver-like heat radiation units 20Da and 20Db. The two fourth bent louver-like heat radiating units 20Da and 20Db are arranged in a “V” shape so that the distance between the four bent louver-like heat radiating units 20Da and 20Db decreases from the inlet portion 13a side to the outlet portion 13b side. The angle formed by 20 Db is θ. Further, in the fourth embodiment, the fourth bent louver-like heat radiation units 20Da and 20Db may be in contact with each other on the + Y side, or may be arranged with a slight interval.

  Further, in the fourth heat sink 100D, the fourth bent louver-like heat radiation units 20Da and 20Db are disposed obliquely with respect to the cooling fluid CF from the inlet portion 13a. The cooling fluid CF sent from the outside of the fourth heat sink 100D to the inlet portion 13a flows into the space between the fourth bent louver-like heat radiation units 20Da and 20Db from the inlet portion 13a and is sent to the back side thereof. . Here, the distance between the fourth bent louver-like heat radiation units 20Da and 20Db gradually decreases from the inlet 13a side toward the back. In the fourth bent metal plate 10D at the innermost side, the fourth bent louver-like heat radiation units 20Da and 20Db are arranged so as to be in contact with each other or to have a small interval. For this reason, the cooling fluid CF is evenly distributed in the gaps (cooling fluid passages 15D) between the many fourth bent metal plates 10D in the fourth bent louver-like heat radiation unit 20D. For this reason, the cooling fluid CF that has evenly flowed into the cooling fluid passage 15D can cool the fourth bent louver-like heat radiation unit 20D evenly.

Here, even if the angle θ is reduced, in the fourth embodiment, the bending angle α1 and the angle α2 of the fourth bent metal plate 10D are set so that the width W1 of the fourth bent louver-like heat radiation units 20Da, 20Db is reduced. By adjusting, cooling efficiency can be maintained.
Further, the angle θ formed by the two fourth bent louver-like heat radiation units 20Da and 20Db constituting the “V” shape can be set according to the size of the actual base plate portion 11.

  In the fourth embodiment, both the angle α1 and the angle α2 are 120 °, both the angle γ1 and the angle γ2 are 0 °, the width W1 of the Y axis is 3.1 mm, and the fourth bent metal plates 10D are 6 mm. It is particularly preferable that the angle θ formed by the fourth bent louver-like heat radiation units 20Da and 20Db is 2.8 °. As a result, the cooling fluid is disturbed in the laminar flow state, and some agitation occurs in the flow. For this reason, only the central portion of the cooling fluid passage 15D passes through at a high speed, and the ratio of the cooling fluid CF that does not contact the surface of the fourth folded metal plate 10D decreases. Since a larger proportion of the cooling fluid CF comes into contact with the surface of the fourth bent metal plate 10D, the cooling efficiency is improved as a whole.

  A large number of fourth bent metal plates 10D that are thermally connected to the base plate portion 11 are arranged in parallel in the louver shape on the base plate portion 11, thereby forming a cooling space formed between the adjacent fourth bent metal plates 10D. Even if the gap of the fluid passage 15D expands, the cooling efficiency does not decrease much. Specifically, the heat sink performance that has conventionally been achieved when the gap is about 0.5 mm can be obtained even if the gap is expanded to 1.5 mm or more.

  Further, in the fourth embodiment, the fourth bent metal plate 10D has the same shape as the first bent metal plate 10A described in the first embodiment, but the second bent metal plate 10B described in the second embodiment. Alternatively, the third bent metal plate 10C described in the third embodiment may be used.

<Manufacturing method of fourth bent louver-like heat radiation unit 20D>
The fourth bent louver-like heat radiating unit 20D is formed by pressing one metal plate material. The following description is about the fourth bent louver-like heat radiating unit 20D formed by stacking two metal plate materials. To do. FIG. 8 is a diagram for explaining a case where the fourth bent louver-like heat radiating unit 20D is configured by two metal plate members. In FIG. 8, the direction in which the inter-plate passage inlets 14a configured by the fourth bent louver-like heat radiation unit 20D are arranged is indicated by the X ′ axis, and the direction orthogonal to the X ′ axis is indicated by the Y ′ axis.

As shown in FIG. 8, the fourth bent louver-like heat radiation unit 20D is formed by pressing metal plate materials separately and then joining them.
First, the 1st bending unit 21 shown by Fig.8 (a) is manufactured with a press machine not shown. The first metal flat plate portion 10D1 and the second metal flat plate portion 10D2 are cut and raised by pressing a single metal plate such as aluminum having a thickness of H / 2. A portion that is not cut and raised from one metal plate material becomes the first frame portion 161. The second metal flat plate portion 10D2 is cut and raised by about 45 degrees from the first frame portion 161, and the angle between the first metal flat plate portion 10D1 and the second metal flat plate portion 10D2 is α1. The angle between the first metal flat plate portion 10D1 and the X ′ axis is γ1. Further, the width of the first bending unit 21 in the Y′-axis direction is W1 / 2.

  Similarly, the 2nd bending unit 22 shown by FIG.8 (b) is manufactured with a press machine not shown. The second metal flat plate portion 10D2 and the third metal flat plate portion 10D3 are cut and raised by pressing one metal plate material such as aluminum having a thickness of H / 2. A portion not cut and raised from one metal plate material becomes the second frame portion 162. The width in the Y′-axis direction of the second bending unit 22 is also W1 / 2. Here, the second bending unit 22 may be a member obtained by inverting the first bending unit 21 by 180 degrees.

  As shown in FIG. 8C, the manufactured first bending unit 21 and the second bending unit 22 are then brazed, bonded, or crimped. In that case, it aligns so that 2nd metal flat plate part 10D2 of the 1st bending unit 21 and 2nd metal flat plate part 10D2 of the 2nd bending unit 22 may become linear form.

  Thereby, the 4th bending louver-like heat radiation unit 20D used for the 4th heat sink 100D is manufactured. The frame portion 16 has a thickness H that is the sum of the first frame portion 161 and the second frame portion 162, and the fourth bent metal plate 10D has a thickness H / 2. The width in the Y′-axis direction of the fourth bent metal plate 10D is W1.

<Heat exchange operation by the fourth heat sink 100D>
Hereinafter, the heat exchange operation by the fourth heat sink 100D will be described with reference to FIG.
A cooling fluid CF indicated by an arrow AR1 flows from an inlet of the fourth heat sink 100D from an air cooling fan (not shown). The fourth bent louver-like heat radiation units 20D on both sides arranged in a “V” shape are arranged obliquely with respect to the cooling fluid CF (AR1). The cooling fluid CF (ARI) flows obliquely between the fourth bent metal plates 10D of the fourth bent louver-like heat radiation unit 20D as indicated by the arrow AR2. That is, the cooling fluid CF (AR2) flowing into the inter-plate passage inlet 14a flows out of the inter-plate passage outlet 14b through the cooling fluid passage 15D between the adjacent fourth bent metal plates 10D. At this time, the cooling fluid CF (AR2) flows while taking the heat of the surface of the fourth bent metal plate 10D. The cooling fluid CF (AR3) exiting from the inter-plate passage outlet 14b of the fourth bent louver-like heat radiating unit 20D does not collide with other members so as not to slow down the flow rate, and the fourth from the outlet portion 13b in the + X-axis direction. It flows out of the heat sink 100D.

  When the two fourth bent louver-like heat dissipating units 20D are observed from the Z-axis direction, they are arranged in a “V” shape, so that the cooling fluid CF (AR1) flowing into the inlet portion 13a is upstream (−X The cooling fluid CF (AR2) flows between the fourth bent metal plates 10D on the side) and flows to the outlet portion 13b one after another. AR2) flows. That is, in FIG. 6, substantially the same flow rate of the cooling fluid CF flows out from the ten fourth bent metal plates 10D of the two fourth bent louver-like heat radiation units 20D. The heat from the heat-generating component 12 spreads throughout the ten fourth bent metal plates 10D, and the fourth bent metal plate 10D flows with almost the same flow rate of the cooling fluid CF. The cooling efficiency of the louver-like heat radiation unit 20D is improved.

(Fifth embodiment)
<Configuration of Fifth Heat Sink 100E>
FIG. 9 is a plan view of a fifth heat sink 100E of the fifth embodiment.
As shown in FIG. 9, the fifth heat sink 100E of the fifth embodiment is obtained by arranging three fourth heat sinks 100D of the fourth embodiment in parallel in the X-axis direction. In the fifth embodiment, the three fourth heat sinks 100D are arranged in parallel, but the number thereof can be changed as appropriate. Further, in the fifth embodiment, the first bent metal plate 10A described in the first embodiment is used, but the second bent metal plate 10B described in the second embodiment or the third embodiment will be described. The third bent metal plate 10C may be used. Here, the same components as those in the fourth embodiment will be described with the same reference numerals.

  In order to increase the cooling efficiency of the fifth heat sink 100E, it is preferable to reduce the angle θ1 so that as many fourth bent louver-like heat radiation units 20D as possible are arranged within a predetermined width of the base plate portion 11. On the other hand, if the cooling fluid passage 15D becomes too narrow by reducing the angle θ1, the cooling efficiency decreases. In the fifth embodiment, the cooling fluid passage 15D is secured wider by narrowing the width W1 of the fourth bent louver-like heat radiating unit 20D, so that the above-mentioned drawback when the angle θ1 is reduced is compensated.

  In addition, by making the angle θ1 formed by the two fourth bent louver-like heat radiation units 20D constituting the “V” shape within 20 °, a large number of fourth bent louver-like shapes are formed on a certain width of the base plate portion 11. A heat dissipation unit 20D is provided. Further, by setting the angle θ1 within 10 °, the number of the fourth bent louver-like heat radiation units 20D that can be arranged on a certain width of the base plate portion 11 is almost doubled when the angle θ1 is 20 °. be able to. Further, when the angle θ1 is within 5 °, the number of fourth bent louver-like heat radiation units 20D that can be disposed on a certain width of the base plate portion 11 increases.

  As a result, the cooling fluid passage 15D formed by the large number of fourth bent metal plates 10D that are thermally connected to the base plate portion 11 as a plate-like heat dissipator above the base plate portion 11 causes a significant decrease in cooling efficiency. It can be expanded without any problems. Specifically, in the fifth embodiment, conventionally, the heat sink performance achieved when the gap is about 0.5 mm may expand the gap to 1.5 mm or more.

  In the fifth embodiment, the angle formed by the fourth bent metal plates 10D of the two adjacent fourth heat sinks 100D is set to θ2. Further, the heat exchanging operation by the fifth heat sink 100E is the same as that of the fourth embodiment, and thus the description thereof is omitted.

(Sixth embodiment)
<Configuration of the sixth heat sink 100F>
FIG. 10 is a perspective view of a sixth heat sink 100F of the sixth embodiment, and FIG. 11 is a plan view of the sixth heat sink 100F of the sixth embodiment.
The sixth embodiment is an example in which the first partition wall 19a and the second partition wall 19b are provided on the second heat sink 100B of the second embodiment. The same constituent elements as those in the second embodiment will be described with the same reference numerals.

  More specifically, the first partition wall 19a and the second partition wall 19b are provided on both sides of the base plate portion 11 in the Y-axis direction because the cooling fluid CF, for example, air is guided in a plane parallel to the plate surface of the base plate portion 11. Is provided. Here, the 1st partition 19a and the 2nd partition 19b are about 0.4 mm to 1.2 mm, for example.

  The first partition wall 19a is disposed in the space on the + Y side of the second bent louver-like heat radiation unit 20B. The first partition wall 19a is for partitioning from adjacent portions except for the inlet 23a and each cooling fluid passage 15. The first partition wall 19a includes a first side wall plate 18a that is provided so as to be separated from the second bent louver-like heat radiation unit 20B in the Y-axis direction and substantially parallel to each first metal flat plate portion 10Ba. Further, the first partition wall 19a has a first baffle plate 17a that connects the first metal flat plate portion 10Ba of the second bent metal plate 10B on the −X side of the second bent louver-like heat radiating unit 20B and the first side wall plate 18a. is doing.

  Further, the second partition wall 19b is arranged in the space on the −Y side of the second bent louver-like heat radiation unit 20B. The second partition wall 19b is for partitioning from adjacent portions except for the outlet portion 23b and each cooling fluid passage 15B. The second partition wall 19b includes a second side wall plate 18b provided so as to be separated from the second bent louver-like heat radiation unit 20B in the Y-axis direction and substantially parallel to each of the seventh metal flat plate portions 10Bg. Further, the second partition wall 19b has a second baffle plate 17b that connects the seventh metal flat plate portion 10Bg of the second bent metal plate 10B on the + X side of the second bent louver-like heat radiating unit 20B and the second side wall plate 18b. ing.

  Here, the materials of the side wall plates 18a and 18b and the baffle plates 17a and 17b constituting the first partition wall 19a and the second partition wall 19b are not particularly limited, and an appropriate material is considered in consideration of bonding properties and the like. It may be used, and an alloy having good thermal conductivity such as aluminum, copper, or an alloy thereof similar to the base plate portion or the bent louver-like heat radiation unit may be used.

  10 and 11, the first baffle plate 17a and the second baffle plate 17b are provided so as to be substantially perpendicular to the first metal flat plate portion 10Ba and the seventh metal flat plate portion 10Bg. The first baffle plate 17a and the second baffle plate 17b may be provided so as to form an angle with respect to the first metal flat plate portion 10Ba and the seventh metal flat plate portion 10Bg. Further, the side wall plates 18a and 18b and the baffle plates 17a and 17b do not have to be made as separate members, and may be made by bending a single metal plate as an integral member.

  In the sixth embodiment, the second bent metal plate 10B described in the second embodiment is used. However, the first bent metal plate 10A described in the first embodiment or the third embodiment will be described. The third bent metal plate 10C may be used.

<Heat exchange operation by the sixth heat sink 100F>
Next, the heat exchange operation by the sixth heat sink 100F will be described with reference to FIG.
The cooling fluid CF (arrow AR1) sent from an air cooling fan (not shown) flows along the first side wall plate 18a into the inlet 23a of the sixth heat sink 100F. Since the inter-plate passage inlet 14a of the second bent metal 10B is disposed obliquely with respect to the cooling fluid CF (AR1), the cooling fluid CF (ARI) is the second bent of the second bent louver-like heat radiating unit 20B. It flows diagonally between the metals 10B as indicated by the arrow AR2. That is, the cooling fluid CF (AR2) flowing into each inter-plate passage inlet 14a flows along the cooling fluid passage 15B formed between the adjacent second bent metals 10B and exits from each inter-plate passage outlet 14b. Go. The heat of the heat generating component 12 is transmitted to the second bent metal 10 </ b> B through the base plate portion 11. The cooling fluid CF (AR2) flows while taking heat from the surface of the second bent metal 10B. In the cooling fluid passage 15B, the direction of the cooling fluid CF (AR2) can be changed, but the flow rate of the cooling fluid CF (AR2) does not become too slow because of the gradual change in direction. The cooling fluid CF (AR3) exiting from the inter-plate passage outlet 14b flows out of the sixth heat sink 100F from the outlet portion 23b in the −X axis direction along the second side wall plate 18b.

(Seventh embodiment)
<Configuration of seventh heat sink 100G>
FIG. 12 is a plan view of a seventh heat sink 100G of the seventh embodiment.
The seventh heat sink 100G of the seventh embodiment is obtained by arranging three sixth heat sinks 100F of the sixth embodiment in parallel in the X-axis direction. In the seventh embodiment, three sixth heat sinks 100F are arranged in parallel, but any number of sixth heat sinks 100F may be arranged in parallel. Further, in the seventh embodiment, the second bent metal plate 10B described in the second embodiment is used, but the first bent metal plate 10A described in the first embodiment or the third embodiment will be described. The third bent metal plate 10C may be used. Here, the same constituent elements as those in the sixth embodiment will be described with the same reference numerals.

  In the seventh embodiment, the first side wall plate 18 a and the second side wall plate 18 b (see FIG. 11) that are adjacent to each other can be used as one, so that the single side wall plate 28 is used. Further, the first baffle plate 17 a and the side wall plate 28 or the second baffle plate 17 b and the side wall plate 28 form the partition wall 29.

  In the seventh heat sink 100G, the inlet portion 33a is constituted by the first metal flat plate portions 10Ba of the two adjacent second bent louver-like heat radiating units 20B, and the outlet portion 33b is adjacent to the two second bent louver-like heat radiating units. It is comprised by 20B 7th metal flat plate part 10Bg.

  In order to increase the cooling efficiency of the seventh heat sink 100G, it is preferable to arrange as many second bent louver-like heat radiation units 20B as possible in a predetermined range of space. Moreover, even if the space | gap of the cooling fluid channel | path 15B formed between the adjacent 2nd bending metal plates 10B expands, it does not cause a fall of cooling efficiency. Specifically, in the seventh embodiment, conventionally, the heat sink performance achieved when the gap is about 0.5 mm is maintained even if the gap between the second bent metal plate 10B is expanded to 1.5 mm or more. Is done.

  Further, the heat exchange operation by the seventh heat sink 100G is the same as that of the sixth embodiment, and thus the description thereof is omitted.

(Eighth embodiment)
<Configuration of the eighth heat sink 100H>
FIG. 13 is a plan view of an eighth heat sink 100H of the eighth embodiment.
As shown in FIG. 13, the eighth heat sink 100H has a third side wall plate 18c and a fourth side wall plate 18d as first partitions in the fourth bent louver-like heat radiation unit 20D of the fourth embodiment. . Here, the same components as those in the fourth embodiment will be described with the same reference numerals.

  In the eighth embodiment, a fourth bent louver-like heat radiating unit 20 </ b> D is provided on the base plate portion 11. And the 3rd side wall board 18c is provided in the entrance part 13a side of 4th bending louver-like thermal radiation unit 20D, and the 4th side wall board 18d is provided in the exit part 13b side of 4th bending louver-like thermal radiation unit 20D.

  The fourth bent louver-like heat radiating unit 20D and the third side wall plate 18c are arranged so that the distance between the fourth bent louver-like heat radiating unit 20D and the fourth side wall plate is gradually narrowed from the inlet portion 13a toward the outlet portion 13b. 18d is arranged so that the interval gradually increases from the inlet 13a toward the outlet 13b. Here, the fourth bent louver-like heat radiating unit 20D may be disposed so as to be in contact with the third side wall plate 18c and the fourth side wall plate 18d at both ends of the frame portion 16, or arranged so as to be separated from each other with a slight gap. May be.

  In the eighth heat sink 100H, the angle formed by the fourth bent louver-shaped heat radiating unit 20D and the third side wall plate 18c is θ1, and the angle formed by the fourth bent louver-shaped heat radiating unit 20D and the fourth side wall plate 18d is θ2. is there. Here, the setting of the angle θ1 and the angle θ2 is the same as the setting of the angle θ1 and the angle θ2 of the fifth embodiment.

  As the material of the third side wall plate 18c and the fourth side wall plate 18d, the same material as the first side wall plate 18a and the second side wall plate 18b of the sixth and seventh embodiments is used. The same method as in the sixth and seventh embodiments is used as a method of fixing the four side wall plates 18d to the base plate portion 11.

  In the eighth embodiment, the first bent metal plate 10A described in the first embodiment is used, but the second bent metal plate 10B described in the second embodiment or the third embodiment will be described. The third bent metal plate 10C may be used.

<Operation of heat exchange by the eighth heat sink 100H>
Next, the heat exchange operation by the eighth heat sink 100H will be described with reference to FIG.
The cooling fluid CF sent from the outside of the eighth heat sink 100H to the inlet portion 13a along the arrow AR1 flows between the third side wall plate 18c and the fourth bent louver-like heat radiation unit 20D from the inlet portion 13a. And sent to the back side. Since the distance between the fourth bent louver-like heat radiating unit 20D and the third side wall plate 18c is gradually narrowed from the inlet portion 13a side toward the back, the gaps between the many fourth bent metal plates 10D (for cooling) Dispersed in the fluid passage 15B). As a result, the cooling fluid CF (AR2) flows almost evenly into the inter-plate passage inlet 14a of each cooling fluid passage 15B, passes through each cooling fluid passage 15B, and flows out from the inter-plate passage outlet 14b. Further, the cooling fluid CF flowing out from the inter-plate passage outlet 14b is as indicated by an arrow AR3 in a space formed by the fourth bent louver-like heat radiation unit 20D and the fourth side wall plate 18d on the outlet portion 13b side. It flows out of the eighth heat sink 100H.

(Ninth embodiment)
<Configuration of ninth heat sink 100J>
FIG. 14 is a plan view of a ninth heat sink 100J of the ninth embodiment.
The ninth heat sink 100J of the ninth embodiment is obtained by arranging three eighth heat sinks 100H of the eighth embodiment in the X-axis direction. In the ninth embodiment, three eighth heat sinks 100H are arranged in parallel. However, any number of eighth heat sinks 100H may be arranged in parallel. Further, in the seventh embodiment, the first bent metal plate 10A described in the first embodiment is used, but the second bent metal plate 10B described in the second embodiment or the third embodiment will be described. The third bent metal plate 10C may be used. Here, the same constituent elements as those in the eighth embodiment will be described with the same reference numerals.

  Of course, in order to increase the cooling efficiency of the ninth heat sink 100J, it is preferable to arrange as many fourth bent louver-like heat radiation units 20D as possible in a predetermined range of space. Further, even if the gap of the cooling fluid passage 15B formed between the adjacent fourth bent metal plates 10D is widened, the cooling efficiency is not lowered. Specifically, in the ninth embodiment, conventionally, the heat sink performance achieved when this gap is about 0.5 mm is maintained even if the gap between the fourth bent metal plate 10D is expanded to 1.5 mm or more. Is done.

  As described above, the optimal embodiment of the present invention has been described in detail. However, as will be apparent to those skilled in the art, the present invention can be implemented with various modifications and variations within the technical scope thereof.

10A to 10D: bent metal plate 10Aa, 10Ab, 10Ac, 10Ba, 10Bg ... metal flat plate portion 11 ... base plate portion 12 ... heat generating component 13a, 23a, 33a ... inlet portion, 13b, 23b, 23b ... outlet portion 14a ... passage between plates Inlet 14b: Inter-plate passage outlet 15A-15D ... Cooling fluid passage 16, 16a, 16b ... Frame portion 17a, 17b ... Baffle plate 18a, 18b, 28a, 28b, 18c, 18d ... Side wall plates 19a, 19b, 29a, 29b ... Partitions 20A to 20D ... Bent louver-like heat radiation units 21, 22 ... Bending units 100A to 100J ... Heat sink CF ... Cooling fluid H ... Thickness of bent metal plate W1, W2, W3 ... Width of bent metal plate

Claims (18)

A base plate to which heat-generating components are thermally connected, a plurality of bent metal plates arranged in parallel above the base plate and thermally connected to the base plate, and cooling of one end side of the base plate In a heat sink comprising an inlet portion into which a working fluid flows and an outlet portion from which the cooling fluid flows out on the other end side of the base plate,
The gaps between the multiple bent metal plates arranged in parallel and the adjacent bent metal plates serve as cooling fluid passages, respectively.
The cooling fluid flows from the inlet portion to an inter-plate passage inlet composed of the adjacent bent metal plates, flows through a cooling fluid passage composed of the adjacent bent metal plates, and the adjacent bent portions. By flowing from the inter-plate passage exit composed of metal plates to the outlet portion,
A heat sink in which the cooling fluid flows while being bent in the cooling fluid passage. A large number of the bent metal plates form one heat radiating unit arranged in a straight line as a whole,
The heat dissipation unit includes a plurality of inter-plate passage inlets and a plurality of inter-plate passage outlets by a large number of bent metal plates,
The cooling fluid flows from the inlet portion into a surface where a large number of inter-plate passage inlets are arranged, and after passing through the cooling fluid passage, flows out from a surface where a large number of inter-plate passage outlets are arranged. The heat sink according to claim 1.   The heat sink according to claim 2, wherein the heat radiating unit includes a frame body connected to a number of the bent metal plates.   Either of the said heat radiation unit is arrange | positioned, and it arrange | positions in the V shape so that the space | interval of the two said heat radiation units may become narrow toward the said exit part side from the said entrance part side. A heat sink according to claim 1.   5. The heat radiation unit arranged in a number of V shapes is repeatedly arranged, and the adjacent heat radiation units in adjacent V shapes are widened from the inlet side toward the outlet side. The heat sink described.   An angle formed by the heat radiating unit arranged in a V shape so as to become narrower from the inlet side toward the outlet side is within 20 °, preferably within 10 °, more preferably within 5 °. Item 5. The heat sink according to item 4.   The angle formed by the adjacent heat dissipating units in the V-shaped arrangement arranged so as to widen from the inlet side toward the outlet side is within 20 °, preferably within 10 °, more preferably 5 °. The heat sink according to claim 5, wherein A large number of the bent metal plates are formed from a single metal plate material,
The heat sink according to claim 3, wherein the metal plate material has a shape cut and raised toward both surfaces thereof. A large number of the bent metal plates are composed of two metal plate materials,
The heat sink according to claim 3, wherein the two metal plate members have the same shape and are cut and raised toward one surface of the metal plate material. A large number of the bent metal plates are composed of two metal plate materials,
One sheet of metal sheet is cut and raised toward one side.
The heat sink according to claim 3, wherein another metal plate has a large number of holes on a surface thereof.   The heat sink according to claim 1, wherein a cross section of the bent metal plate has a shape bent into a number of straight lines.   The heat sink according to claim 11, wherein a cross section of the bent metal plate has a “Z” -shaped shape bent in three straight lines.   2. The heat sink according to claim 1, wherein a cross section of the bent metal plate has a shape in which several portions are curved in an arc shape.   14. The heat sink according to claim 13, wherein a cross section of the bent metal plate has an “S” shape in which two portions are curved in an arc shape. A first partition is provided on a surface where a large number of the inter-plate passage inlets of the heat radiating unit are arranged so that the cooling fluid does not flow out,
The heat sink according to claim 2, wherein a second partition wall is provided on a surface on which a large number of the inter-plate passage outlets of the heat radiating unit are arranged so that the cooling fluid does not flow in. The first partition is provided on a side of the first side wall plate that is separated from the heat dissipation unit and is parallel to a surface where the inter-plate passage entrances are arranged, and a number of the inter-plate passage entrances of the heat dissipation unit are arranged. It is constituted by a first baffle plate connecting the end portion of the heat radiating unit on the outlet side and the first side wall plate,
The second partition wall is provided on a side of the second side wall plate that is separated from the heat dissipation unit and is parallel to a surface on which the inter-plate passage outlets are arranged, and a number of the inter-plate passage outlets of the heat dissipation unit are arranged. The heat sink of Claim 15 comprised by the 2nd baffle plate which connects the edge part of the said thermal radiation unit by the side of the said entrance, and the said 2nd side wall board. The first partition includes a third side wall plate provided on a side where a large number of the inter-plate passage inlets of the heat radiating unit are arranged, and an interval between the heat radiating unit and the third side wall plate is from the inlet side. It is configured to narrow toward the exit part side,
The second partition wall includes a fourth side wall plate provided on a side where a large number of the inter-plate passage outlets of the heat radiating unit are arranged, and an interval between the heat radiating unit and the fourth side wall plate is from the outlet side. The heat sink of Claim 15 comprised so that it may become narrow toward the said entrance part side.   18. The heat sink according to claim 15, wherein the heat radiating unit, the first partition, and the second partition are repeatedly arranged on the base plate.