JP2013153116A - Heating body cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating body cooling device capable of improving heat radiation efficiency by causing a refrigerant to be distributed to the entire groove formed between heat radiation fins.SOLUTION: A heating body cooling device 1 includes: a heat radiation plate 2 in which a plurality of plate-like heat radiation fins 2a formed to be raised by digging a metal plate itself are formed with a predetermined interval; a dish-like cover 3 in which a tip end of the heat radiation fin 2a is abutted on an internal bottom surface for capping and an end face of an opening is abutted on an outer peripheral side of the heat radiation plate 2 for sealing; a liquid reservoir 4 formed on both sides in a width direction of the plurality of heat radiation fins 2a; and a pair of through-holes 3a formed at the cover 3 positioned to correspond to the liquid reservoir 4. A refrigerant is distributed, through the through hole 3a, to a groove 2b formed between adjoining heat radiation fins 2a, formed in multiple numbers. The plate thickness of the bottom surface of the groove 2b is formed thinner than the plate thickness of the metal plate, and near both ends of the groove 2b, a slope or an arc-like surface is formed between one side of the metal plate and the bottom surface of the groove 2b.

Description

  The present invention relates to a heating element cooling device for efficiently cooling heat generated from a heating element such as an electronic component, and more specifically, between adjacent ones of a plurality of radiating fins that are integrally formed upright on a radiating plate. The present invention relates to a heating element cooling device configured to allow a refrigerant to flow therethrough.

  For example, as a heating element cooling structure for cooling heat generated from a heating element made of an electronic component such as a semiconductor integrated circuit, a plurality of radiation fins are arranged in parallel on a radiation surface thermally connected to the heating element. A heating element cooling device that cools a heating element by allowing a refrigerant to flow between adjacent ones of the radiating fins is disclosed in, for example, Japanese Patent Application Laid-Open No. 2010-182980 (Patent Document 1).

  FIG. 9 shows a heating element cooling device disclosed in Patent Document 1. In FIG. In the heating element cooling device 100, the peripheral edges of the heat radiating plate 102 and the metal cover 103 to be crowned by the heat radiating plate 102 are joined together and sealed, and the inside thereof is formed into a hollow sealed structure. Yes. The cover 103 is formed in a substantially dish shape. A plurality of plate-like fins 104 are formed on the inner surface of the substantially flat heat sink 102, and a groove 105 is formed between each of the fins 104. The opening side end face of the cover 103 and the peripheral edge of the heat sink 102 are joined together and sealed by a sealing means such as welding, brazing or adhesion.

  Further, the cover 103 is formed with a pair of hollow cylindrical portions 106 which project from the hollow interior to the exterior. Then, after a refrigerant such as pure water flows into the hollow interior from one cylindrical portion 106 and flows through the plurality of grooves 105, the refrigerant is allowed to flow out from the other cylindrical portion 106.

  The heating element cooling device 100 is joined to a heat-generating component such as a semiconductor element or an integrated circuit on the heat-dissipating plate 102, and when the heat-generating component generates heat, it is transmitted to the plurality of plate-like fins 104 via the heat-dissipating plate 102. Since the refrigerant flows in the hollow space formed in the sealed structure of the heating element cooling device 100, the plate-like fins 104 are cooled to suppress the temperature rise of the heat generating components.

JP 2010-182980 A

  In the heating element cooling apparatus 100 described above, in order to increase the heat radiation efficiency, it is desirable to distribute the refrigerant through the entire groove 105 formed between the fins 104. However, in the heating element cooling device 100 shown in Patent Document 1, since the steps 107 are formed at substantially right angles at both ends of the groove 105, the refrigerant flowing from one of the grooves 105 passes near the cover 103 side. For this reason, the bottom surface of the groove 105 causes the stagnation of the refrigerant due to the step 107, so that the circulation of the refrigerant is hindered. As a result, the refrigerant flows through a part of the fins 104, and there is a problem that the assumed heat dissipation efficiency cannot be obtained.

  Then, the subject of this invention is providing the heat generating body cooling device which can improve heat dissipation efficiency by distribute | circulating a refrigerant | coolant to the whole groove | channel formed between each of a radiation fin.

  In order to solve the above problems, a heating element cooling apparatus according to the present invention is formed with a plurality of plate-like heat radiation fins at predetermined intervals formed on one side of a metal plate by digging up the metal plate itself. A heat sink, a dish-shaped cover sealed by bringing the tip of the heat sink fin into contact with the inner bottom surface and sealing the end face of the opening in contact with the outer peripheral side of the heat sink, And at least a pair of through holes formed in the cover corresponding to the liquid pool portion, and adjacent to each of the multiple fins of the heat sink fins. The heating element cooling device is configured to allow the refrigerant to flow through the groove formed in the groove, and the thickness of the bottom surface of the groove is smaller than the thickness of the heat dissipation plate. In addition, near the both ends of the groove, the heat dissipation To form a slope or arcuate surface between the one surface and the bottom surface of the.

  The tips of the heat radiating fins formed on the heat radiating plate are in contact with the bottom surface inside the cover to isolate the grooves formed between the adjacent radiating fins.

  Desirably, the tips of the heat radiating fins formed on the heat radiating plate are brought into contact with the bottom surface inside the cover, and the bottom surface of the cover and the tips of the heat radiating fins are sealed with a sealing material such as a brazing material. .

  According to the heating element cooling device according to the present invention, by forming the inclined surface or the arc surface in the vicinity of both ends of the groove formed between adjacent ones of the multiple radiating fins formed on the heat radiating plate, one of the grooves It is possible to smoothly circulate the refrigerant flowing in from the bottom to the bottom of the groove along the inclined surface or the arc surface. For this reason, since a refrigerant | coolant is distribute | circulated through the whole groove | channel, since the heat | fever of a radiation fin can be rapidly radiated with a refrigerant | coolant, efficiency can be improved.

  Moreover, since the groove | channel between each radiating fin is isolated by making the front-end | tip of the multiple radiating fin formed in the heat sink abut | in contact with the bottom face inside a cover, since a refrigerant | coolant distribute | circulates a groove | channel reliably. Therefore, it is possible to stably maintain the heat radiation efficiency.

  Furthermore, by sealing the tip of each radiating fin and the bottom surface of the cover with a sealing material such as a brazing material, the groove is reliably isolated and integrated with the tip of each radiating fin and the cover. Therefore, even a thin radiating fin can increase the mechanical strength, so that deformation of the groove and the like can be prevented, and the refrigerant can be circulated stably.

It is front sectional drawing which shows an example of the heat generating body cooling device concerning this invention. It is a disassembled perspective view which shows the state which covers a heat sink with a cover. It is a sectional side view of the heat generating body cooling device in FIG. It is a fragmentary sectional view which shows the state which sealed the cover inner surface and the radiation fin front-end | tip. It is explanatory drawing which shows the distribution | circulation state of a refrigerant | coolant. It is a perspective view which shows the outline | summary of the standing formation method of a radiation fin. (A), (B), and (C) are process diagrams showing a method for forming the radiating fins upright. It is front sectional drawing which shows the other Example of the heat generating body cooling device concerning this invention. It is explanatory drawing which shows the distribution | circulation state of the refrigerant | coolant in the conventional heat generating body cooling device.

  The heat generating device cooling device includes a heat radiating plate in which a large number of plate-shaped radiating fins are formed on one side of a metal plate by digging the metal plate itself at a predetermined interval, and a tip of the radiating fin is provided inside. A plate-shaped cover that is crowned by being brought into contact with the bottom surface of the plate and sealed by bringing the end face of the opening into contact with the outer peripheral side of the heat radiating plate, and a liquid pool formed on both sides in the width direction of the heat radiating fins. And a pair of through-holes formed in the cover corresponding to the liquid reservoir, and a refrigerant formed in a groove formed between adjacent ones of the plurality of radiating fins via the through-holes. It is configured to flow through. The thickness of the bottom surface of the groove is formed thinner than the thickness of the heat sink, and an inclined surface or an arc surface is formed between one surface of the heat sink and the bottom surface near both ends of the groove. doing.

  Next, the heating element cooling device according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a front sectional view showing an embodiment of a heating element cooling device according to the present invention. The heating element cooling device 1 includes a heat radiating plate 2 in which a large number of thin plate-like heat radiating fins 2a are formed at predetermined intervals, and a plate-like cover 3 that forms a space inside. The heat radiating plate 2 is made of a metal plate material having good thermal conductivity, such as aluminum, aluminum alloy, copper alloy, or stainless steel. Similarly, the cover 3 is formed by pressing a metal plate material such as aluminum, copper, or stainless steel that can be plastically processed.

  A plurality of plate-like thin radiating fins 2a formed on one surface of the radiating plate 2 have grooves 2b formed between adjacent ones. The plate thickness of the bottom surface of the groove 2b is formed by digging down the metal plate itself by a forming method to be described later. Further, as shown in FIG. 2, such a large number of plate-like thin radiating fins 2 a are formed so that the dimension in the width direction is smaller than the width dimension of the flat radiating plate 2. A flat portion 2c that becomes the pool portion 4 is formed. Furthermore, the dimension in the front-rear direction of the heat radiating plate 2 and the dimension in the front-rear direction of the multiple radiating fins 2a are set to substantially the same dimensions as shown in FIG.

  As shown in FIG. 1, slopes 2d are formed between both ends of the groove 2b between the flat portion 2c and the bottom surface of the groove 2b. The opening angle formed by the slope 2d and the bottom surface of the groove 2b is set to 110 degrees to 160 degrees.

  On the other hand, the cover 3 is formed in a dish shape from a metal plate material selected from aluminum, an aluminum alloy, a copper alloy, stainless steel, or the like by a well-known drawing process using a press. Moreover, the dimension of the opening side of the cover 3 is set to be the same as the outer dimension of the heat radiating plate 2 described above, and the end face on the opening side is formed flat. Further, as shown in FIG. 1, a liquid reservoir 4 is formed between the both sides of the multiple plate-like heat radiation fins 2 a and the inner surface of the cover 3 with a predetermined distance therebetween. The cover 3 is provided with a pair of through holes 3a on both sides of the upper surface. The position of the through hole 3 a corresponds to the liquid reservoir 4. Moreover, the through-hole 3a is provided in order to let the refrigerant | coolant mentioned later flow in the groove | channel 2b formed between each adjacent of many strip | radiation fins 2a. Each through hole 3a is provided with a cylindrical flow pipe 5 for connecting a tube to be connected to a pump (not shown).

  When such a cover 3 is crowned from above the multiple radiating fins 2 a of the radiating plate 2 and is fitted into the end face of the radiating plate 2 by light press-fitting or press-fitting, the tips of the radiating fins 2 a are inside the cover 3. The groove 2b between the heat radiating fins 2a is isolated by contacting the bottom surface. At this time, since the dimension in the front-rear direction of the heat radiating plate 2 and the dimension in the front-rear direction of the multiple radiating fins 2a are set to be substantially the same, as shown in FIG. Also, a deformed groove is formed between the inner wall of the cover 3. In this state, the end face of the heat sink 2 and the cover 3 are sealed with a sealing material. The sealing material is appropriately selected from, for example, silver brazing, phosphor copper brazing, brass brazing and the like.

  In order to reliably isolate the grooves 2b between the heat radiating fins 2a, as shown in FIG. 4, the tips of the heat radiating fins 2a and the bottom surface inside the cover 3 are sealed with a sealing material 6 such as a brazing material. It may be sealed. Thereby, the cover 3 and the radiation fin 2a are integrated. The sealing material 6 is appropriately selected from, for example, silver brazing, phosphor copper brazing, brass brazing and the like. It should be noted that since the multiple radiating fins 2a of the radiating plate 2 are thin, it is desirable to select a brazing material having a melting temperature lower than that of the radiating plate 2 and the cover 3 and having good wettability. As long as these conditions are satisfied, solder may be used.

  Thus, by sealing the tip of the radiation fin 2a and the bottom surface of the cover 3 with a sealing material such as a brazing material, the thin radiation fin 2a is integrally supported by the cover 3, so that the radiation fin 2a Is prevented, and the refrigerant surely flows through the groove 2b, so that the heat radiation efficiency can be stably maintained.

  For example, a heating element (not shown) disposed in an electronic device or the like is attached to the heat radiating plate 2 of the heating element cooling apparatus 1 configured as described above in a surface-bonded state. The refrigerant sent from the pump or the like flows into the one through hole 3a through the tube and the flow pipe 5. The refrigerant fills the liquid pool portion 4 formed between the cover 3 and the heat radiating plate 2 and flows through the grooves 2b between adjacent ones of the multiple heat radiating fins 2a, and eventually the other through hole 3a. And then returned to the refrigerant cooling device via the flow pipe 5 and the tube. When the refrigerant flows through the multiple grooves 2b, the heat transferred from the heating element is cooled by the radiation fins 2a.

  In the present invention, the slope 2d is formed between the flat portion 2c near the both ends of the groove 2b and the bottom surface of the groove 2b. When such a slope 2d is formed, when the refrigerant flows from one liquid reservoir 4 to the groove 2b and when it flows from the groove 2b to the other liquid reservoir 4, it is as shown by a dotted line in FIG. Then, the refrigerant flows into the bottom surface side of the groove 2b along the inclined surface 2d, and the refrigerant flowing along the bottom surface side eventually flows out into the other liquid reservoir 4 along the other inclined surface 2d. The refrigerant that has flowed into the upper portion of the groove 2 b close to the inner surface of the cover 3 smoothly flows in the groove 2 b and flows out to the other liquid reservoir 4. In this way, the refrigerant flows through the entire groove 2b, and it is possible to eliminate the stagnation of the refrigerant in the groove 2b, which has been a factor that hinders the heat radiation efficiency in the past, so that the heat radiation efficiency is improved. Can do.

  Here, a method of forming the radiation fin 2a will be described. The heat radiating plate 2 is formed by first standing up a plurality of plate-shaped heat radiating fins 2 a on one surface of a metal plate having a predetermined plate thickness and size by a digging tool 7. The metal plate is selected from, for example, aluminum, an aluminum alloy, a copper alloy, stainless steel, or the like having a good thermal conductivity.

  As shown in FIG. 6, the digging tool 7 is formed with a blade portion 7 a perpendicular to the moving direction at the tip on the bottom surface side. Further, tapered surfaces 7b are formed on both sides of the blade portion 7a. Then, as shown in FIG. 6, the digging tool 7 configured in this way is tilted at a predetermined angle θ so that the rear end side is higher than the metal plate on which the heat radiating plate 2 is formed, and is driven not shown. Attached to the device. The inclination angle θ of the digging tool 7 is appropriately set depending on the height of the radiating fin 2, the plate thickness, the material of the metal plate, or the like, but is generally set to 5 degrees to 20 degrees.

  Then, after the blade portion 7a of the digging tool 7 is brought into contact with one surface of the metal plate as shown in FIG. 7A, the digging tool 7 is moved by the driving device as shown in FIG. 7B. By inserting the metal plate in a multi-directional direction of the metal plate at a predetermined angle and moving the metal plate to a predetermined depth as shown in FIG. 7C, the radiating fins 2a having a predetermined height are formed upright. Is done. Next, the digging tool 7 is moved to the upstream position, and the digging process for moving the digging tool 7 until reaching a predetermined depth is sequentially repeated, so that the radiating fins 2a stand up at the same height, the same angle, and the same interval. The grooves 2b are formed between the heat radiating fins 2a. Thus, since the plate | board thickness in the bottom face of the groove | channel 2b formed between each radiating fin 2a digs a metal plate with the digging tool 7, and forms the radiating fin 2a, it is a metal plate, ie, the radiating plate 2 It is formed thinner than the plate thickness. The heat sink 2 is formed by such a process.

  At this time, since the taper surfaces 7b are formed on both sides of the blade portion 7a of the digging tool 7, after the blade portion 7a is brought into contact with one surface of the metal plate, a predetermined state shown in FIG. As a result, the inclined surface 2d having the same angle as the tapered surface 7b is formed in the vicinity of both ends of the groove 2b. The slope 2d is formed between the flat portion 2c and the bottom surface of the groove 2b.

  Thus, in order to form the inclined surface 2d formed between the flat portion 2c and the bottom surface of the groove 2b without a step, as shown in FIG. 7C, the height of the tapered surface 7b of the digging tool 7 is obtained. Is preferably larger than the depth of the bottom surface of the groove 2b formed between the radiating fins 2a.

  When the method for forming the heat dissipating fins 2a as described above is adopted, when the blade portion 7a of the digging tool 7 is brought into contact with one surface of the metal plate and moved to reach a predetermined depth, Due to the friction generated therebetween, the heat radiating fins 2a are gradually formed thinner from the base on the heat radiating plate 2 side to the tip. By forming the radiating fin 2a in such a shape, the heat transferred from the heating element via the radiating plate 2 is first radiated from the base of the radiating fin 2a having a relatively large heat capacity, and then thinned. Since heat is transmitted toward the leading end side while being cooled, efficient cooling is possible.

  FIG. 8 shows another embodiment of the heating element cooling device 1 according to the present invention. The difference from the embodiment shown in FIG. 1 is that an arcuate surface 2e is formed between the flat portion 2c near both ends of the groove 2b and the bottom surface of the groove 2b. Even in such a circular arc surface 2e, the refrigerant flows from the liquid reservoir 4 along the circular arc surface 2e to the bottom surface side of the groove 2b and then flows out to the other liquid reservoir 4 as in the above-described embodiment. Can be made. For this reason, since a refrigerant | coolant distribute | circulates the whole without stagnation in the groove | channel 2b, heat dissipation efficiency can be improved.

  In order to form the arc surface 2e between the flat portion 2c near both ends of the groove 2b and the bottom surface of the groove 2b, both sides of the blade portion 7a of the digging tool 7 described above are formed on the arc surface 7b. A circular arc surface is formed by erecting the heat dissipating fins 2 a with the tool 7.

  Although the present invention has been specifically described above based on the embodiments, it is needless to say that the present invention is not limited to the above embodiments and can be variously modified without departing from the gist thereof. For example, in the embodiment described above, a slope or an arc surface is formed between the flat portion near both ends of the groove and the bottom surface of the groove, but in the case of the slope, as a slope connecting the center of the groove and the flat portions on both sides, The bottom surface of the groove may be formed in a substantially V shape. Moreover, in the case of a round lake surface, you may form the whole groove | channel in U shape. Moreover, you may curl especially the front end side of a radiation fin. In this case, since the curling portion contacts the inner surface of the cover, the grooves can be easily separated.

DESCRIPTION OF SYMBOLS 1 Heat generating body cooling device 2 Radiating plate 2a Radiating fin 2b Groove 2c Flat part 2d Slope 3 Cover 3a Through-hole 4 Liquid reservoir part

Claims (3)

A heat radiating plate in which a large number of plate-like heat radiating fins are formed at predetermined intervals on one side of the metal plate, and the tips of the radiating fins are brought into contact with the inner bottom surface. And a dish-shaped cover sealed with the end face of the opening being in contact with the outer peripheral side of the heat radiating plate, a liquid reservoir formed on both sides in the width direction of the radiating fin, and the liquid reservoir At least a pair of through holes formed in the cover corresponding to the portion, so that the coolant flows through grooves formed between adjacent ones of the plurality of radiating fins. A heating element cooling device configured;
The thickness of the bottom surface of the groove is formed thinner than the thickness of the heat sink, and an inclined surface or an arc surface is formed between one surface of the heat sink and the bottom surface near both ends of the groove. A heating element cooling device characterized by that.   2. The heating element cooling device according to claim 1, wherein the tips of the heat radiating fins formed on the heat radiating plate are in contact with a bottom surface inside the cover to isolate a groove formed between adjacent ones of the heat radiating fins. .   The front end of the heat radiating fin formed on the heat radiating plate is brought into contact with the bottom surface inside the cover, and the bottom surface of the cover and the front end of the heat radiating fin are sealed with a sealing material such as a brazing material. The heating element cooling device according to 1.

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