JP2012182411A - Heat generating body cooling device and heat generating body cooling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat generating body cooling device and a heat generating body cooling method that reduce a flow resistance by linearly conducting a cooling fluid, and emit heat in groove portions without stagnating it.SOLUTION: A heat generating body cooling device 1 includes a radiator 2 having many plate-shaped radiation fins 2a formed at predetermined intervals on one surface of a metal plate to form groove portions 2b between adjacent radiation fins 2a, and a dish-shaped cover 3 covering the radiation fins 2a, and is configured to cool the radiation fins 2a with a cooling fluid. Tip ends of the radiation fins 2a are spaced from a bottom surface of the cover 3 to form a flow passage 8 for conducting the cooling fluid, openings 3a are formed in the positions of a front end 8a and a back end 8b of the flow passage 8 in the cover 3 to conduct the cooling fluid linearly, the radiation fins 2a have plate surfaces arranged in parallel with the openings 3, and the cooling fluid is conducted substantially at right angles to the plate surfaces.

Description

  The present invention relates to a heating element cooling device and a heating element cooling method for efficiently cooling heat generated from a heating element such as an electronic component.

  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 radiating fins are arranged in parallel on a radiating plate thermally connected to the heating element. 2. Description of the Related Art A heat dissipating device that cools a heating element by passing a coolant through a gap between heat dissipating fins is known. As a generally known heat radiating device, a liquid cooling type in which a liquid is circulated between a plurality of heat radiating fins arranged in parallel and an air cooling type in which a cooling air is circulated are known.

  An air-cooled heat dissipation device is disclosed in, for example, Japanese Patent Application Laid-Open No. 2010-123891 (Patent Document 1), Japanese Patent Application Laid-Open No. 2010-177623 (Patent Document 2), or Japanese Patent Application Laid-Open No. 2010-165761 (Patent Document 3). Has been.

  In the cooling devices shown in Patent Documents 1 and 2, a plurality of heat radiation fins are provided at a predetermined interval on the base of the heat radiator, and a blower fan is disposed on one side of the heat radiator so as to face the heat radiation fins. ing. Then, cooling air is supplied to one side of the radiating fin by the blower fan, this cooling air is inserted between the radiating fins, guided to the radiating fin, moved to the other side, and forcedly exhausted from the other side. I have to.

  In addition, the cooling device shown in Patent Document 3 is devised to dissipate heat generated from a heating element such as an electronic component more efficiently, and a plurality of sheets are provided on the back side of the base portion provided with the electronic component. A plate-like fin is provided, and a fan for discharging the heat-exchanged air is provided on one side of the cooling fin. Further, a ventilation hole is formed in the base portion, and cooling air is supplied to the cooling fin through the ventilation hole, thereby improving the cooling efficiency of the heating element such as an electronic component.

JP 2010-123891 A JP 2010-177623 A JP 2010-165761 A

  The conventional air-cooling type cooling devices disclosed in Patent Documents 1 and 2 described above supply cooling air from one side of the radiating fin by a blower fan, and circulate this cooling air between the radiating fins and move it to the other side. It is configured to let you. In an air-cooled cooling system in which a plurality of radiating fins are provided at a predetermined interval on the base of a radiator, in order to dissipate heat generated from heating elements such as electronic components with high efficiency, the radiating area is increased by increasing the number of radiating fins. It is necessary to enlarge it. For this reason, as a countermeasure, measures have been taken to increase the number of radiating fins by narrowing the interval between adjacent radiating fins in a limited space.

  However, when cooling air is circulated between the radiating fins by the blower fan to dissipate heat, since the space between the radiating fins becomes narrow, the flow resistance inevitably increases. Distribution may become difficult and may stagnate in some cases. This tendency becomes prominent when the number of fins is increased by narrowing the interval between the heat dissipating fins in order to increase the heat dissipating efficiency, which inevitably has a problem that the efficiency of the air-cooled cooling device is limited.

  The air-cooling type cooling device disclosed in Patent Document 3 forms a vent hole in the base portion to dissipate heat stagnating in the gap between the radiating fins, and supplies cooling air from the vent hole to the cooling fin. By trying to improve the heat dissipation efficiency. However, similarly to the air-cooling type cooling device shown in Patent Documents 1 and 2 described above, the cooling air of the blower fan is circulated between the radiating fins. The problem that the resistance is increased and the efficiency of the air-cooled cooling device is limited cannot be solved.

  Accordingly, an object of the present invention is to provide a heating element cooling device and a heating element cooling that can reduce the flow resistance by linearly circulating the cooling fluid and can discharge the heat in the groove without stagnation. It is to provide a method.

  In order to solve the above-described problems, the heating element cooling device according to the present invention has a plurality of plate-like heat radiation fins formed at a predetermined interval on one surface of a metal plate, and a groove is formed between adjacent heat radiation fins. A heating element cooling device configured to cool the radiation fins with a cooling fluid, the tip of the radiation fins and the cover A flow passage that allows the cooling fluid to flow is formed apart from the bottom surface, and openings that allow the cooling fluid to flow linearly are formed at positions of a front end and a rear end of the flow passage of the cover. The radiating fin is configured so that the plate surface is arranged in parallel with the opening and the cooling fluid is circulated substantially perpendicular to the plate surface with respect to the plate surface.

  Further, the plate-like heat radiation fins formed in a large number of strips have at least the tip side facing the flow passage directed toward the front end side of the flow passage.

  It is desirable to form the plate surface of the radiating fin formed in a number of strips at least at the tip side facing the flow path at right angles to the flow direction of the cooling fluid.

  The heat radiating plate is formed of a metal plate such as aluminum or copper having a good thermal conductivity, and the heat radiating plate includes a large number of plate-shaped heat radiating fins standing up by digging up the metal plate itself at a predetermined interval. A strip is formed, and a groove is formed between the adjacent heat radiating fins.

  The radiating fins formed in a large number of strips may be divided into a plurality of rows and provided with gap portions spaced between the rows at a predetermined interval.

  A slit is formed on the side surface of the cover on the base end side of the end surface of the heat radiating fin, and the base end side of the heat radiating fin communicates with the slit formed on the side surface of the cover. It is desirable to communicate with the flow path through a groove between adjacent heat radiating fins.

  Moreover, the heating element cooling method according to the present invention uses the above-described heating element cooling device, and includes a circulation device that circulates the cooling fluid in the flow passage, and the rear of the flow passage from the front end by the circulation device. When the cooling fluid is circulated toward the end at a predetermined flow rate, the cooling fluid is introduced into the grooves formed between the adjacent ones of the radiating fins, and then returned to the flow path, together with the cooling fluid. It discharges toward the rear end of the flow passage.

  According to the heating element cooling device according to the present invention, the flow passage for circulating the cooling fluid is formed between the tip of the radiating fin and the bottom surface of the cover, and the cooling fluid can be circulated linearly in this flow passage. Therefore, the flow resistance of the cooling body can be reduced, and the flow velocity of the cooling fluid from the front end to the rear end of the flow path can be increased. In addition, by arranging the plate surface of the radiating fin parallel to the opening and allowing the cooling fluid to circulate almost perpendicularly to the plate surface, a plate-shaped radiating fin in which a part of the cooling fluid having a high flow velocity is formed in a number of strips. Therefore, the heat stagnated in the groove can be quickly discharged to the rear end together with the cooling fluid flowing in the flow path after being discharged in the direction of the flow path.

  At this time, a plurality of plate-like heat radiation fins are formed so that at least the tip side facing the flow path faces the front end of the flow path, so that a part of the cooling fluid is in the groove between the heat radiation fins. It is possible to promptly flow the heat into the groove, and the heat stagnated in the groove can be quickly discharged.

  Further, by forming the plate surface on at least the front end side of the radiating fin facing the flow path so as to be perpendicular to the flow direction of the cooling fluid, after a part of the cooling fluid comes into contact with the plate surface of the radiating fin, The cooling fluid is in a turbulent state in the groove, such as flowing into the back while repeatedly reflecting between the opposing plate surfaces in the groove, so the heat stagnated in the groove can be discharged while stirring, and the heat dissipation efficiency is improved. It becomes possible to raise.

    By digging up a metal plate itself made of aluminum, copper or the like having a good thermal conductivity as a heat sink, a plurality of plate-like heat sink fins are formed upright, so that groove portions of arbitrary spacing can be formed between adjacent heat sink fins. It becomes possible to form, and it becomes possible to increase a heat radiation area by forming many heat radiation fins, and it becomes possible to improve a heat radiation effect.

  Dividing a large number of strips of radiating fins into multiple rows and separating each row at a predetermined distance to provide a gap, so that the cooling fluid can be circulated in a straight line in the gap as well as in the flow path. Therefore, the cooling fluid can also flow into the groove part from the gap part, and the heat stagnated in the groove part can be quickly discharged. In addition, since the cooling fluid is allowed to flow from the side of the radiating fin, the heat stagnated in the deepest portion in the groove can be discharged in a short time, and the heat radiating effect can be further improved.

  A slit is formed on the side surface of the cover located on the base end side of the end surface of the heat dissipating fin, and the slit and the flow path are connected to the heat dissipating fin by connecting the base end side of the heat dissipating fin and the slit formed on the side surface of the cover. It communicates through a groove between adjacent ones. The cooling fluid flowing through the flow path can flow into the grooves between the plate-like heat radiation fins, and then the heat stagnated in the grooves can be discharged from the slit to the outside of the cover, thus improving the heat dissipation effect. It becomes possible.

    According to the heating element cooling method according to the present invention, the cooling fluid is circulated at a predetermined wind speed from the blower or the suction device that circulates the cooling fluid to the flow path of the heating element cooling device to the flow path. Therefore, the flow resistance of the cooling body can be reduced, and the flow velocity of the cooling fluid from the front end to the rear end of the flow passage can be increased. When the cooling fluid flows through the flow passage, a part of the cooling fluid is brought into contact with the plate surface of the radiating fins arranged in parallel with the openings and flows into the grooves between the radiating fins. The stagnant heat can be discharged quickly.

  The heating element cooling device includes a heat sink in which a plurality of plate-like heat radiation fins are formed at a predetermined interval on one surface of a metal plate, and a groove is formed between adjacent heat radiation fins, and a dish that covers the heat radiation fins. And a heating element cooling device configured to cool the radiation fins with a cooling fluid, wherein the cooling fluid is circulated by separating a tip of the radiation fins from a bottom surface of the cover. An opening for linearly circulating the cooling fluid is formed at the front end and the rear end of the flow path of the cover, and the plate surface of the radiating fin is parallel to the opening. The cooling fluid is configured to flow substantially perpendicularly to the plate surface with respect to the plate surface.

  Further, the heating element cooling method uses the above-described heating element cooling device, and includes a flow machine that circulates the cooling fluid in the flow path, and the flow machine moves from the front end to the rear end of the flow path. When the cooling fluid is circulated at a predetermined flow rate, the cooling fluid is introduced into the grooves formed between adjacent ones of the heat dissipating fins, and then returned to the flow passage. Together with the cooling fluid, the flow passage It discharges toward the rear end.

  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 side view 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 plate-shaped radiating fins 2a are formed at predetermined intervals, and a dish-shaped cover 3 that forms a space inside. The heat radiating plate 2 is formed of a metal plate material such as aluminum, aluminum alloy, copper alloy, or stainless steel, which can be plastically processed and has good thermal conductivity. Similarly, the cover 3 is formed by pressing a metal plate material such as aluminum, copper, or stainless steel that can be plastically processed. The cover 3 may be a synthetic resin having relatively heat resistance.

  As shown in FIGS. 2 and 4, the multiple plate-like heat radiation fins 2 a formed on one surface of the heat radiating plate 2 have the same width dimension as the width of the heat radiating plate 2. . The longitudinal dimension in which the multiple radiating fins 2 a are arranged is substantially the same as the longitudinal dimension of the radiating plate 2. In addition, the dimension in the longitudinal direction of the heat radiating fins 2 a may be formed shorter than the dimension in the longitudinal direction of the heat radiating plate 2, and may be formed substantially at the center in the longitudinal direction of the heat radiating plate 2.

  The multiple radiating fins 2a are integrally formed upright by digging up the metal plate itself as a material with a cutting tool. For this reason, a groove portion 2b is formed between each adjacent radiating fin 2a, and the thickness of the bottom surface of the groove portion 2b is formed thinner than the thickness of the metal plate itself. Thereby, when the heating element is joined to the other surface of the heat radiating plate 2, the base end portion of each radiating fin 2 a is close to the other surface of the heat radiating plate 2. Since it can be transmitted to 2a, it contributes to the improvement of heat dissipation efficiency.

  As shown in FIG. 5, the heat radiating plate 2 first forms a large number of plate-shaped heat radiating fins 2 a on one surface of a metal plate material 4 having a predetermined plate thickness and size. The heat radiating fins 2 a are formed upright by the cutting tool 5. The cutting tool 5 is formed with a blade portion perpendicular to the moving direction at the bottom end, and the width thereof is set to be the same as or slightly larger than the width of the metal plate material 4. Further, the cutting tool 5 is attached to a drive device (not shown) with an inclination at a predetermined angle so that the rear end side becomes higher with respect to one surface of the metal plate material 4. The inclination angle is appropriately set according to the height of the heat radiating fins 2a, the plate thickness, the material of the metal plate material 4, and the like, but is set to about 5 to 20 degrees.

  And after making the blade part of the cutting tool 5 contact | abut to one side of the metal plate raw material 4, if the cutting tool 5 is inserted in the direction of an arrow at a predetermined angle with a drive device, the blade part of the cutting tool 5 will be The heat radiating fins 2a having a predetermined height are formed upright by biting into one surface of the metal plate material 4 and further moving until reaching a predetermined depth. Next, by moving the cutting tool 5 to the upstream position and repeating the digging process for moving the cutting tool 5 until it reaches a predetermined depth, the radiating fins 2a are erected at the same height, the same angle, and the same interval. It is formed. The heat sink 2 is formed by such a process. As shown in FIG. 3, the multiple radiating fins 2 a erected in this way are curled from the proximal end side to the distal end side. The radiating fin is formed in various shapes as will be described later.

  In addition, what is necessary is just to make the amount of digging by the cutting tool 5 constant in order to form the radiation fin 2 of the same height. In addition, when the material of the metal plate raw material 4 is the same, the height of the radiation fin 2a can be set to an arbitrary height by appropriately changing the digging angle and the depth of the cutting tool 5.

  As described above, the multiple radiating fins 2a formed upright by the cutting tool 5 have a plate thickness of 0.01 to 1.0 mm, and the width of the groove 2b formed between the adjacent radiating fins 2a is also the same. It is formed to 0.01 to 1.0 mm. As described above, by reducing the plate thickness of the radiating fin 2a and reducing the width of the groove 2b, the radiating area per unit area of the radiating plate 2 can be significantly increased. Can be greatly increased.

  On the other hand, the cover 3 is formed from a metal plate material selected from aluminum, an aluminum alloy, a copper alloy, stainless steel, or the like into a substantially dish shape or a substantially U shape by pressing. And the opening 3a is formed in the front end and back end which are the right-and-left both sides in FIG. Since the cover 3 shown in FIGS. 1 and 2 is formed in a substantially U shape, the opening 3a is formed to be large in the vertical direction. In addition, in FIG. 3, as shown with a dashed-dotted line, the downward side of the opening 3a may be obstruct | occluded by the cover part 3e, and a cooling fluid may distribute | circulate only to the flow path 8 mentioned later. In the cover 3 configured in this manner, the leg portions 3 c on both sides are fixed to the end surface in the width direction of the heat radiating plate 2 by an appropriate means.

  In a state where the cover 3 is covered and fixed to the heat radiating plate 2, the flow path 8 for circulating cooling fluid described later is formed by separating the tips of the multiple radiating fins 2 a and the inner bottom surface of the cover. is doing. The flow path 8 is formed in a straight line that penetrates from the left front end side 8a to the right rear end side 8b in FIG. The front end side 8 a and the rear end side 8 b are positioned corresponding to the opening 3 a formed at the front end and the rear end of the cover 3. In addition, it is desirable that the end faces on both sides in the width direction of the radiating fins 2a formed in multiple strips are in contact with the side wall inner surface 3d of the cover 3, as shown in FIG. Further, as shown in FIG. 3, the multiple radiating fins 2a facing the flow passage 8 are formed in an arc shape, and the front end side of the radiating fin 2a is directed to the opening 3a on the front end side 8a.

  Next, an air-cooling heating element cooling method in which cooling air is circulated as a cooling fluid will be described as a heating element cooling method. On the front end side 8a side of the heating element cooling device 1 described above, as shown in FIG. As the blower 10, for example, an air cooling fan such as an axial fan that cools a CPU or a personal computer is used. By driving the blower 10 to blow air, the cooling air indicated by the arrows is circulated through the flow passage 8. That is, the cooling air blown from the blower 10 is blown to the front end side 8a. The cooling air circulates linearly in the flow passage 8 formed by separating the tips of the multiple fins 2a and the inner bottom surface of the cover, and is discharged from the opening 3a on the rear end side 8b. There is CW1 and cooling air CW2 directed toward the front end side of the radiation fins 2a formed facing the front end side 8a as a result of the cooling air blown from the blower 10 being diffused.

  As indicated by the solid line in FIG. 3, the cooling air CW1 flows straight because the flow passage 8 is a space free of obstacles, and is discharged from the rear end side 8b at a predetermined wind speed. On the other hand, as indicated by the alternate long and short dash line in FIG. 3, the cooling air CW2 comes into contact with the tip end side of the radiating fin 2a and then flows into the groove 2b formed between the adjacent radiating fins 2a. At this time, as a flow path of the cooling air CW1, a reciprocating flow path that reaches the bottom of the groove 2b along one surface of the heat radiating fin 2a and then returns to the tip side along the other surface; A turbulent flow channel or the like is formed that reaches the bottom while changing its direction in a complicated manner such as spirally or meandering in the groove 2b of the fin 2a and then returns to the tip. After reaching the bottom of the groove 2b, the cooling air CW2 that has returned to the tip side of the radiating fin 2a merges with the cooling air CW1 that circulates in a straight line, flows through the flow passage 8, and is discharged from the opening 3a. At this time, since the cooling air CW1 flows straight through the flow passage 8 at a predetermined wind speed, the cooling air CW2 returned from the inside of the groove portion 2b to the front end side of the radiating fin 2a is sucked into the cooling air CW1. Acts and thus promotes emissions.

  On the other surface of the heat radiating plate 2 opposite to the one surface on which the heat radiating fins 2a are formed, a heating element (not shown) such as a semiconductor integrated circuit, a power transistor, or an electronic component of a resistance element is disposed. The heat generated from the heat generating element is transmitted to the heat radiating fins 2a through the heat radiating plate 2, and is radiated from the base end side of the heat radiating fins 2a into the groove 2b. When the width of the groove 2b formed between the multiple heat radiation fins 2a is set to be as small as 0.01 to 1.0 mm as in a conventional cooling device, heat is radiated toward the groove 2b. The heat to stagnate. In the cooling device of the present invention, the cooling air CW2 was introduced into the groove portion 2b and then pushed out toward the flow passage 8. Thus, it was confirmed that the heat radiation efficiency was improved.

  Hereinafter, the measurement results of the heating element cooling device 1 shown in FIGS. 1 to 3 will be described. As shown in FIG. 3, the multiple radiating fins 2 a are curled from the proximal end side to the distal end side. The radiation fins 2a have a height of 5.6 mm, a pitch between the radiation fins of 2.0 mm, and a thickness of the radiation fins of 0.7 mm. In addition, as a measuring device, the other side of the heating element cooling device 1 is heated by a 60 W heating element (electric heater), and 4 m / s of cooling air is blown from the front end side 8 a from the blower 10 to the flow path 8. The thermal resistance in this state was measured.

  As a result, the thermal resistance was 0.408 (° C./W). Incidentally, when the cooling air is blown in parallel with the groove portion of the radiating fin 2a and the cooling air is circulated between the groove portions as in the conventional heating element cooling device, the thermal resistance is 0.583 (° C. / W), and it was confirmed that the heat radiation efficiency was improved by about 43%. In addition, when using the radiation fin 2a having a height of 5.6 mm, a pitch between the radiation fins of 1.0 mm, and a thickness of the radiation fin of 0.45 mm, the thermal resistance is 0.392 (° C./W). Met. When cooling air was blown in parallel with the grooves of the radiating fins 2a, it was 0.618 (° C./W), and it was confirmed that the radiating efficiency was improved by about 58%.

  In the above-described embodiment, the cover 3 is formed in a substantially dish shape or a substantially U shape, and both sides of the heat radiating fins 2a of the heat radiating plate 2 are closed. However, in FIGS. As shown, a slit 3b may be formed on the lower end side of the side wall on both sides of the cover 3 so that the bottom of the groove 2b of the radiating fin 2a communicates with the outside via the slit 3b. Incidentally, the thermal resistance when the slit 3b is formed is 0.363 (° C./W) in the case of the former radiating fin 2a, and 0.425 (° C./W) in the case of the latter radiating fin 2a. After all, it was confirmed that the heat dissipation efficiency was greatly improved.

  When the slits 3b are formed on the lower end sides on both sides of the cover 3, the cooling air CW2 is in contact with the front end side of the heat radiating fins 2a and then the grooves 2b formed between the heat radiating fins 2a, as in the above-described example. And reaches the bottom of the groove 2b in the form of the above-described one-way channel or turbulent channel. After that, as indicated by the dotted line in FIG. 3, the cooling air CW2 flows out from the slit 3b, so that the heat dissipated into the groove 2b is discharged to the outside. On the other hand, the heat radiated from the front end side of the radiating fin 2a of the radiating plate 2 is discharged from the opening 3a while being sucked by the cooling air CW1. Thus, the heat radiated to the bottom side of the groove 2b of the radiating fin 2a is discharged through the slit 3b, and the heat radiated to the tip side of the radiating fin 2a is sucked by the cooling air CW1 that flows straight. By discharging from the opening 3a, the heat in the groove 2b can be shared and discharged, and the heat dissipation efficiency can be further enhanced.

  In the embodiment described above, the blower 10 is provided on the front end side 8 a side of the heating element cooling device 1, and the cooling air CW <b> 1 blown from the blower 10 is circulated through the flow passage 8. As described above, in order to allow the cooling air CW1 to flow through the flow passage 8, a suction device (not shown) is provided on the rear end side 8b, and the inside of the flow passage 8 is sucked by the suction device, thereby flowing in from the front end side 8a side. Alternatively, the cooling air CW1 may be circulated through the flow passage 8 and discharged from the opening 3a on the rear end side 8b through a suction device. Note that the suction device may be an air-cooling fan such as an axial flow fan, similar to the blower 10 described above. Moreover, even if it is the liquid cooling type which used liquids, such as water and alcohol, as a cooling fluid as a cooling fluid, it can be used similarly. However, when using a liquid, an infusion pump or the like as a distributor is used.

  FIG. 6 shows a modified example of a large number of radiating fins 2 a formed upright on the radiating plate 2. 6A, the base end side of the radiating fin 2a is curled in the same manner as the radiating fin 2a shown in FIG. 3, but in particular, the tip end side is substantially flat so as to be perpendicular to the radiating plate 2. In this example, the cooling air CW1 is applied at a right angle. Thus, by forming the tip side vertically, the thermal resistance was lowered to 0.492 (° C./W), and the heat dissipation efficiency was improved. FIG. 6B shows an example in which the heat radiating fins 2a are formed substantially flat and the tip is inclined toward the front end side 8a. When the radiating fins 2a are inclined as described above, the cooling air CW1 can easily flow into the bottom of the groove 2b. When the heat dissipating fins 2a shown in FIG. 6B are formed, the thermal resistance is 0.503 (° C./W), but the heat dissipating efficiency is improved by about 36% compared to the conventional case. FIG. 6C shows an example in which flat radiating fins 2 a are vertically formed with respect to the radiating plate 2. Even with the heat dissipating fins 2a formed in this way, the heat dissipating efficiency is improved by about 19%.

  7 and 8 show a second embodiment of the heating element cooling device according to the present invention. The difference from the above-described embodiment is that the heat dissipating fins 2a formed in a large number of strips are divided into two in the width direction, and gap portions 9 spaced apart by a predetermined interval are provided between the rows. As in the above-described embodiment, when the cooling air CW1 is blown from the blower provided on the front end side 8a side of the heating element cooling device 1, the air flows through the flow path 8 in a straight line and is discharged from the rear end side 8b. . At this time, the cooling air CW1 also circulates linearly in the gap 9. Since the gap 9 is also a space free of obstacles, the cooling air CW1 flows straight through the gap 9 and is discharged from the rear end side 8b at a predetermined wind speed. When the cooling air CW1 flows through the flow passage 8 and the gap 9 at a predetermined wind speed, a part of the cooling air CW2 (not shown) is located between the adjacent fins 2a as in the cooling air shown in FIG. It also flows into the groove 2b formed in the above. The cooling air CW2 that has flowed into the groove 2b has a single reciprocating flow path that returns to the front end side of the heat fin 2a after reaching the bottom, and has a complicated orientation such as a spiral or meandering in the groove 2b of the radiating fin 2a. After passing through a path such as a turbulent flow channel that returns to the front end side while changing the flow, it merges with the cooling air CW1 that circulates in a straight line, circulates through the flow passage 8, and is discharged from the rear end side 8b. Is done.

  In this second embodiment, since the cooling air CW1 is circulated through both the flow path 8 and the gap 9, both the front end side of the radiating fin 2 a and the lateral side in contact with the gap 9 are in the groove 2 b. Since the cooling air CW1 flows in and the heat in the groove 2b is discharged, the heat radiation efficiency can be further increased. Note that a plurality of gap portions 9 may be provided at two or more locations, and the heat radiation fins 2a may be divided into two or more rows.

  FIG. 9 shows a third embodiment of the heating element cooling device according to the present invention. This embodiment is configured to facilitate attachment to a device that uses the heating element cooling device 1. In the first embodiment described above, the multiple plate-like heat radiation fins formed on one surface of the heat radiating plate 2 are formed to have the same size as the widthwise dimension of the heat radiating plate. In the embodiment, the multiple plate-like heat radiation fins 20a formed on one surface of the heat radiating plate 20 are formed to be smaller than the width of the flat heat radiating plate 2 in the width direction. A flat portion 20c is formed. The longitudinal dimension in which the multiple radiating fins 20 a are arranged is substantially the same as the longitudinal dimension of the radiating plate 20.

  As in the above-described embodiment, the multiple radiating fins 20a are integrally formed upright by digging up a metal plate itself as a material with a cutting tool. The method for forming the heat dissipating fins 20a is the same as the method of the above-described embodiment, but the difference is that the width dimension of the cutting tool is set smaller than that of the metal plate. By digging up the radiating fins 20a with this cutting tool, groove portions 20b are formed between the adjacent radiating fins 20a. The thickness of the bottom surface of the groove portions 20b is smaller than the thickness of the metal plate itself. It is formed. Therefore, the multiple radiating fins 20a are erected from a position lower than the flat portion 20c. The flat portions 20c formed on both sides are provided with mounting holes 20d at predetermined positions, and are attached to the equipment to be used by fixing means such as screws 32. On the other hand, the cover 30 shown in FIG. 9 is configured in the same manner as the above-described embodiment, but the protruding leg portion 30b is bent and fixed to the flat portion 20c.

  In this way, in the state where the cover 30 is attached to the heat radiating plate 20 and the multiple radiating fins 20a are covered, the tips of the multiple radiating fins 20a and the inner bottom surface of the cover 30 are the same as in the above-described embodiment. Between these, a flow passage 31 for circulating cooling air is formed. Then, the cooling air is blown to the flow passage 31 by the blower, and the cooling air is linearly circulated in the flow passage 31 at a predetermined wind speed, so that a part of the cooling air is formed between the adjacent fins 20a. It also flows into the groove 20b. The cooling air that has flowed into the groove 20b changes its direction in a complicated manner such as a reciprocating flow path that returns to the tip side of the heat fin 20a after reaching the bottom, and a vortex or meander in the groove 20b of the radiating fin 20a. However, after reaching the bottom, after passing through a path such as a turbulent flow channel that returns to the tip side, the flow passes through the flow passage 31 in a straight line and circulates and is discharged from the opening. This is the same as the embodiment described above.

  FIG. 10 shows a fourth embodiment of the heating element cooling device according to the present invention. This embodiment is particularly suitable for a liquid cooling system in which a liquid such as water or alcohol is used as a cooling fluid. The difference from the air-cooled heating element cooling device described above is that, in a state where the cover 41 is fixed to the heat sink 40 by being crowned, the tips of the multiple fins 40a and the inner bottom surface of the cover 41 are separated from each other, A flow passage 42 for flowing a liquid as a cooling fluid is formed, and both sides in the width direction of the plurality of radiating fins 40a are separated from the inner side surface of the cover 41, and a first flow passage for flowing the liquid WA is provided. Two flow passages 43 are formed. The flow passage 42 and the second flow passage 43 are formed in a straight line penetrating from the front end side to the rear end side.

  By flowing the liquid WA as a cooling fluid from the front end side by an infusion pump or the like (not shown), the liquid WA flows through the flow passage 42 and the second flow passage 43 at a predetermined flow rate. At this time, a part of the liquid also flows from the flow passage 42 and the second flow passage 43 into the groove portion 40b formed between the adjacent ones of the radiation fins 40a. Then, since the liquid flows into the groove 40b from both the upper side and the side of the radiating fin 40a, a more complicated turbulent flow is generated in the groove 40b to absorb the heat in the groove 40b, and then the flow path 42. And the liquid WA that flows in a straight line through the second flow passage 43 circulates and is discharged from the rear end side. As described above, since the liquid WA as a cooling fluid has a large heat absorption capacity, the heat dissipation efficiency can be increased as compared with the air-cooling type, and thus the heating element cooling device can be downsized.

  FIG. 11 shows a fifth embodiment of the heating element cooling device according to the present invention. In this embodiment, a large number of plate-like heat radiation fins 50 a formed on one surface of the heat radiation plate 50 are meandered and bent. In order to erectly form such a meandering radiating fin 50a, the blade portion formed at the tip of a digging tool (not shown) has the same shape as the radiating fin 50a and has a substantially triangular shape having a plurality of curved portions along the width direction. It is formed by forming. The meandering heat dissipation fin 50a may be formed in a substantially sine wave shape as shown in FIG. 13A or a substantially trapezoidal shape as shown in FIG.

  As described above, the heat sink 50 having the meandering heat sink fins 50a is covered with the cover 3 and the tips of the multiple fins 50a. And a flow passage 53 for circulating cooling air from the front end side 51 to the rear end side 52 is formed between the front end side 51 and the inner bottom surface of the cover 3. Further, as shown in FIG. 11, the meandering heat radiating fin 50 a is inclined so that the tip thereof is directed toward the front end side 51, or at least the tip side is formed perpendicular to the flow passage 53 or the heat radiating plate 50. .

  Then, as in the above-described embodiment, the cooling air CW as a cooling fluid is blown to the flow passage 53 by a blower, and the cooling air CW is circulated in a straight line at a predetermined wind speed in the flow passage 53. The portion also flows into a groove portion 50b formed between adjacent ones of the radiation fins 50a. The cooling air CW generates a complicated turbulent flow in the groove 50b and discharges heat from the groove 50b. Then, the cooling air CW joins and flows through the flow passage 53 and is discharged from the opening on the rear end side 52 side.

  In this embodiment, the heat radiation fin 50a meanders and is formed upright, whereby the heat radiation area of the heat radiation fin 50a is further increased and the heat radiation effect can be enhanced. Further, if the heat radiating fins 50a are formed to meander in a substantially triangular shape, a substantially sinusoidal shape, or a trapezoidal shape, the cooling air CW bends in each valley portion of the meandering heat radiation fins 50a when the cooling air is circulated. Therefore, a turbulent flow in which the cooling air CW in the flow passage 53 is changed in a complicated manner is generated, and the heat in the groove 50b can be discharged uniformly.

  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, although the heating element cooling device described above is formed in a quadrangle, it may be formed in a circle, an ellipse, or a polygon. Further, a blower pipe may be connected between the opening of the cover and the blower or the suction machine, and the cooling air may be directly blown to circulate in the flow passage. Furthermore, although the example which stood up by digging up metal plate itself was shown as a radiation fin formed in the radiator, it is applicable also to the well-known radiator which has a radiation fin.

  It is a side view which shows the 1st Example of the heat generating body cooling device concerning this invention.   It is a perspective view which shows the heat generating body cooling device in FIG.   It is a fragmentary sectional view of the heat generating body cooling device in FIG.   It is front sectional drawing of the heat generating body cooling device in FIG.   It is a perspective view which shows the formation means of a radiation fin.   (A) (B) (C) is a fragmentary sectional view which shows the shape of a radiation fin.   It is a perspective view which shows the 2nd Example of the heat generating body cooling device concerning this invention.   It is front sectional drawing of the heat generating body cooling device in FIG.   It is a perspective view which shows the 3rd Example of the heat generating body cooling device concerning this invention.   It is front sectional drawing which shows the 4th Example of the heat generating body cooling device concerning this invention.   It is a sectional side view which shows the 5th Example of the heat generating body cooling device concerning this invention.   It is a perspective view of the heat generating body cooling device in FIG.   (A) (B) is a top view which shows the modification of the radiation fin in FIG.

DESCRIPTION OF SYMBOLS 1 Heat generating body cooling device 2 Radiating plate 2a Radiating fin 2b Groove part 3 Cover 3b Slit 8 Flow path 8a Front end side 8b Rear end side 9 Crevice part 10 Fan 40 Metal plate CW1 Cooling air (cooling fluid)
CW2 cooling air

Claims (7)

A plurality of plate-like radiating fins are formed on one side of the metal plate at predetermined intervals, and a radiating plate in which grooves are formed between the radiating fins, and a dish-shaped cover for covering the radiating fins. A heating element cooling device configured to cool the radiating fin with a cooling fluid,
A flow passage is formed in which the cooling fluid is circulated by separating the tip of the radiating fin and the bottom surface of the cover,
At the positions of the front end side and the rear end side of the flow passage of the cover, an opening through which the cooling fluid flows linearly is formed.
The heat dissipating fin has a plate surface arranged in parallel with the opening, and causes the cooling fluid to flow substantially perpendicular to the plate surface with respect to the plate surface.   2. The heating element cooling device according to claim 1, wherein a plurality of plate-like heat radiation fins formed in a plurality of strips have at least a tip side facing the flow passage directed toward a front end side of the flow passage.   2. The heating element cooling device according to claim 1, wherein the plate surfaces of the plurality of radiating fins formed on at least a tip side facing the flow passage are formed at right angles to a flow direction of the cooling fluid.   The heat radiating plate is formed of a metal plate such as aluminum or copper having a good thermal conductivity, and the heat radiating plate includes a large number of plate-shaped heat radiating fins standing up by digging up the metal plate itself at a predetermined interval. The heating element cooling device according to any one of claims 1 to 3, wherein the heating element cooling device is formed in a strip and a groove is formed between adjacent ones of the radiation fins.   The heating element cooling device according to any one of claims 1 to 3, wherein the plurality of radiating fins formed in a plurality of strips are divided into a plurality of rows, and a gap is provided between each row at a predetermined interval.   A slit is formed on the side surface of the cover on the base end side of the end surface of the heat radiating fin, and the base end side of the heat radiating fin communicates with the slit formed on the side surface of the cover. The heating element cooling device according to claim 1, wherein the flow passage is communicated with a groove between adjacent ones of the radiating fins. A heat dissipation plate having a plurality of plate-like heat radiation fins formed at predetermined intervals on one surface of a metal plate, and a bottom surface of a dish-shaped cover covering the heat radiation fin and a tip of the heat radiation fin are separated from each other. A flow passage through which the cooling fluid flows is formed, and an opening through which the cooling fluid flows is formed at a front end and a rear end of the flow passage of the cover, and a base end of an end surface of the radiating fin is formed on a side surface. A heating element cooling device is formed with a slit on the side, and the heat dissipating fin has a plate surface arranged in parallel with the opening and allows the cooling fluid to flow substantially perpendicular to the plate surface with respect to the plate surface;
A flow machine for circulating the cooling fluid in the flow path,
When the cooling fluid is circulated at a predetermined flow rate from the front end to the rear end of the flow passage by the flow machine, the cooling fluid is caused to flow into a groove formed between adjacent ones of the radiating fins. After that, the heating element is returned to the flow passage and discharged toward the rear end of the flow passage together with the cooling fluid.

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