JP2006147618A - Cooling device and radiator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device having a low noise, a high air volume and a high heat radiation efficiency even when an exhaust part in a plurality of directions is provided.
SOLUTION: A blower unit 3 provided with exhaust ports 8 and 9 in a plurality of directions is provided, and radiating fins 13 and 14 are arranged in these exhaust ports 8 and 9, respectively. One radiating fin 13 is formed with two or more types of lengths, and one radiating fin 13 and another radiating fin 14 are provided with fin portions 16A and 16C having the same length. If it carries out like this, the distance from the fan blade 5 outer periphery in the ventilation part 3 to the entrance surface of the radiation fin 13 can be maintained appropriately, a deterioration in noise performance can be avoided, and low noise can be realized. Moreover, the heat radiation efficiency can be improved by forming the heat radiation fins 13 and 14 partially longer.
[Selection] Figure 1

Description

  The present invention relates to a cooling device used for cooling an MPU (microprocessor unit) that is a heat generating component in a thin electronic device such as a notebook personal computer.

  The present invention also relates to a radiator used in such a cooling device.

  In recent years, along with the improvement in performance of personal computers (personal computers), the heat generated by MPUs installed in personal computers has also been increasing. On the other hand, miniaturization of personal computers has progressed, and there is a demand for higher performance of cooling devices whose main purpose is cooling the built-in MPU.

  In such a situation, the fans of the air blowing section constituting the cooling device also require various air blowing directions, and for example, cooling devices having exhaust ports in a plurality of directions such as two directions are increasing. For example, in patent document 1, the blower which provided the blowing part as an exhaust port opened in the different direction in the side part of the fan motor which is a ventilation part, respectively, and provided the radiation fin as a heat radiator in one or both blowing parts. Is disclosed.

  FIG. 42 shows an example of such an air blower. The air blower 501 is located inside a casing 502 that forms the outer shell of the air blower, and a centrifugal fan 503 is rotatably provided. An intake hole 504 is provided in the bottom surface of the casing 502, and two exhaust ports 506 and 507 are provided in different directions on the side surface of the casing 502 orthogonal to the intake hole 504. In addition, a first heat radiating fin 508 and a second heat radiating fin 509 made of a member such as a metal having good thermal conductivity are arranged in the first air outlet 506 and the second air outlet 507, respectively. .

Here, when the fan 503 constituting the blower unit 501 rotates in the direction of arrow R, the air around the outside of the casing 502 is taken into the blower unit 501 from the intake hole 504. The air is sent out in the radial direction of the outer periphery of the fan blade 510 which is the blade portion of the fan 503, passes through the heat radiation fins 508 and 509 in the exhaust ports 506 and 507, and is discharged to the outside of the cooling device. In FIG. 42, arrows F501 and F502 indicate the flow of air from the fan 503 toward the heat radiation fin 509. As shown in this figure, in the case of a centrifugal fan 503, wind is sent out in the direction of rotation of the fan blade 510 in the tangential direction of the outermost periphery of the fan blade 510.
JP 2004-140061 A

  When the exhaust from the air blowing unit 501 extends in a plurality of directions as in the above-described air blower, the air flow is complicated, and the exhaust efficiency is greatly deteriorated depending on the arrangement of the heat radiation fins 508 and 509. Specifically, as the distance between the outer periphery of the fan blade 510 and the inlets of the heat dissipating fins 508 and 509 that receive the wind from the fin blower 501 decreases, a phenomenon in which noise worsens occurs. In the blower shown in FIG. 42, the wind indicated by the arrow F501 hits another radiating fin 508 on the way, and the wind does not reach the end of the radiating fin 509 sufficiently. When the exhaust efficiency is lowered in this manner, there is a concern that noise as a blower device is increased or that the air volume is lowered or the heat radiation efficiency is deteriorated.

  If the cooling device is located at the center of the casing of the thin electronic device, there is too much distance between the side surface of the housing and the cooling device, and exhaust holes must be provided on the top and bottom surfaces of the housing. . In that case, in the blower shown in FIG. 42, the wind that has reached the heat dissipating fins 508 and 509 from the blower 501 is discharged from the side of the cooling device as it is, into the holes provided on the top and bottom surfaces of the housing. I can't send the wind.

  FIG. 43 shows a heat radiating fin 524 formed by bending a thin plate 522 having a good thermal conductivity. The heat dissipating fins 524 are formed of a single thin plate 522, which is advantageous in terms of heat transfer, but there are portions where ducts cannot be formed above and below the heat dissipating fins 524, and the wind F511 escapes from there. And heat dissipation characteristics are poor. Therefore, in order to form a duct from which the wind does not escape in the middle from the entrance to the exit, another member that covers this vertically opened portion is required.

  On the other hand, the heat dissipating fin 534 shown in FIG. 44 is formed by laminating a plurality of fin materials 530 formed by bending a metal plate material, and the claws 532 formed on the fin material 530 are engaged with adjacent fin materials 530 (not shown). ), The fin members 530 are connected and fixed. However, when the fin members 530 are disengaged, the fin materials 530 are easily disassembled, and the strength is weak, and the fin materials 530 are separated from each other. It is disadvantageous in terms of heat transfer. Further, since the heat dissipating fins 534 having a desired shape are obtained by the mechanical fastening structure of the claws 532, there is a problem that it is difficult to manufacture in a shape having a low height H511.

  FIG. 45 shows the outer member of the cooling device as shown in FIG. In the figure, the outer shell of the cooling device is configured by fixing a metal cover 542 to a resin case 540 by, for example, ultrasonic welding. Here, a plurality of cylindrical bosses 544 as protrusions are provided on the upper end surface of the case 540, and a plurality of circular holes 546 are provided corresponding to these bosses 544. Reference numeral 548 denotes an intake hole provided facing a blower (not shown).

  As shown in FIG. 46, the diameter of the hole 546 is about 0.3 mm to 0.5 mm larger than the outer diameter of the boss 544, and the boss 544 is inserted into the hole 546 with a slight gap 550. . In this case, when a plate-like cover 542 is placed on the upper surface of the case 540 so that each hole 546 fits to each boss 544, the upper portion of the boss 544 protrudes from the hole 546, and this protrusion is ultrasonically welded. The cover 542 is fixed to the case 540 by forming the flange portion 548 by crushing with a machine (not shown).

  However, since there is a slight gap 550 between the boss 544 of the case 540 and the hole 546 of the cover 542, the cover 542 is rattled in the horizontal direction, especially when driving the motor of the air blower. There was a problem that an unpleasant vibration sound was generated between the case 540 and the cover 542 which are two members.

  In the enclosure, the cooling device is fixed to an object such as a substrate with screws, but in recent years, with the improvement in performance, the heat generation of electronic components mounted on the substrate has increased, and the substrate has become denser. ing. If it becomes like this, attachment of a cooling device will be restrict | limited and sufficient insulation distance of the said screw and the electronic component arrange | positioned at a board | substrate cannot be ensured. Moreover, when fixing a cooling device to a target object, there existed a problem that workability | operativity was bad with screwing. Furthermore, there are many parts that require cooling, and there is a problem that the fixing means is limited.

  Further, regarding the attachment of the heat receiving portion and the fixed object constituting the cooling device, for example, as shown in FIGS. 47 and 48, screws 562 inserted through holes 561 provided at the four corners of the substantially rectangular heat receiving plate 560, The mainstream is to provide a floating portion 568 composed of a coil spring 564 provided between the head 563 of the screw 562 and one side surface of the heat receiving plate 560 and a stopper 566 for preventing dropout such as an E ring. It has become. In this case, a substrate (not shown) on which a heat source as an object is mounted is arranged on the other side of the heat receiving plate 560, and when the screw 562 is screwed into a screw hole (not shown), the repulsive force of the coil spring 564 is obtained. Acts on the surface of the heat generating component from the heat receiving plate 560, and the cooling device including the heat receiving plate 560 is attached to the substrate while the other side surface of the heat receiving plate 560 and the surface of the heat generating component are in close contact with each other.

  However, when mounting with the floating portion 568, a direct load is applied to the heat receiving plate 560, the heat receiving plate 560 is easily deformed, and the heat receiving plate 560 is deformed by only about 0.1 mm, resulting in increased thermal resistance and performance. Is significantly worse.

  For example, if the CPU that is the heat source has a certain height, if the male screw 567 at the tip of the screw 562 is over-tightened during attachment to the board, the heat receiving plate 560 will squeeze the coil spring 564 and move further. Thus, the entire tightening force of the male screw portion 567 acts on the substrate with the heat source. Therefore, it is necessary to limit the tightening degree of the male screw portion 567 each time so that the substrate with the heat source is not destroyed.

  As another problem, when a floating mechanism using the coil spring 564 shown in FIGS. 47 and 48 is adopted, a load is applied from the heat receiving plate 560 to the heat source side by several (for example, 3 to 5) coil springs 564. Although the adhesion between the heat receiving plate 560 and the heat source is maintained to a certain extent, the plurality of coil springs 564 are expensive in terms of cost, and an attempt is made to add more load to the heat receiving plate 560. Then, the attachment portion of the coil spring 564 is deformed, and there is a limitation on strength.

  For example, as shown in FIG. 49, for example, a plate-like elastic body, that is, a plate spring 570 is used instead of the coil spring 564. In the same figure, 582 is a heat sink that forms the outline of the cooling device 580, 586 is a cover that covers the upper surface of the concave portion 584 formed on one side of the heat sink 582, and the blower portion 590 having a rotatable fan 588 is provided in the concave portion 584. Provided. Further, a heat receiving portion 592 corresponding to a heat receiving body is formed on the other side of the heat sink 582, and a CPU attached to, for example, a personal computer housing (not shown) on a concave receiving portion 594 formed on the lower surface side of the heat receiving portion 592. A heat source 596 is disposed.

  Reference numeral 600 denotes floating portions respectively disposed at, for example, four corners of the heat receiving portion 592. The cooling device 580 is attached to the personal computer housing using the male screw portion 602 formed at the lower end of the floating portion 600. The floating part 600 has a cylindrical body 606 with a flange 604 attached to the heat receiving part 592, and a hole (not shown) formed around the leaf spring 570 is inserted into the cylindrical body 606. ing.

  As shown by the dotted line in FIG. 49, the leaf spring 570 has a curved central portion in a single state, and when the hole is inserted into the cylindrical body 606 of the floating portion 600, The part is elastically deformed with the central part as a fulcrum. As a result, the central portion of the leaf spring 570 presses the heat receiving portion 592 against the heat source 596, and the adhesion between the heat receiving portion 592 and the heat source 596 is improved.

  However, in the case shown in FIG. 49, since the load applied to the heat receiving part 592 by the leaf spring 570 is merely a point or line contact, the adhesion between the heat source 596 that is a heat generating part and the heat receiving part 592 is poor. Therefore, the heat from the heat source 596 does not sufficiently flow to the cooling device 570 side, and it becomes easy to cause an abnormal operation as a personal computer.

  An object of the present invention is to solve the above-described problems and provide a cooling device with low noise, high air volume, and high heat radiation efficiency even when an exhaust section in a plurality of directions is provided.

  A second object of the present invention is to obtain a cooling device capable of directing exhaust air in a desired direction.

  The third object of the present invention is to secure sufficient strength by forming a single plate, to easily cope with a low-profile, and to improve heat dissipation characteristics without requiring a separate member. It is to obtain a heat radiator that can be used.

  A fourth object of the present invention is to obtain a cooling device capable of greatly reducing the rattling between a plurality of members.

  A fifth object of the present invention is to obtain a cooling device that can improve workability when being fixed to an object and can sufficiently secure an insulation distance from an electronic component mounted on the object.

  The sixth object of the present invention is to obtain a cooling device that can prevent deformation of the heat receiving portion when the heat receiving portion is thermally connected to the heat source and maintain good thermal conductivity.

  A seventh object of the present invention is to obtain a cooling device that prevents an excessive force from being applied to an object without increasing the number of parts.

  An eighth object of the present invention is to obtain a cooling device that can easily improve the adhesion between a heat source and a heat receiving portion.

  In the cooling device according to the first aspect of the present invention, the exhaust portions are provided in a plurality of directions, for example, and the heat dissipating members are arranged in these exhaust portions, and at least one heat dissipating member is made to have two or more different lengths. ing. In this way, the distance from the outer periphery of the fan blade to the radiator in the air blower can be maintained appropriately, so that it is possible to avoid deterioration in noise performance due to the distance between the outer periphery of the fan blade and the radiator being reduced, and low noise. Can be realized. In addition, since the heat radiator is partially formed in accordance with the outer peripheral shape of the fan blade, the heat radiation area is increased accordingly, and the heat radiation efficiency can be increased.

  Further, when the blower unit includes a centrifugal fan, the wind is sent in the direction in which the fan blade rotates and in the tangential direction of the outermost periphery of the fan blade. Therefore, by changing the length of at least one radiator to two or more types, it is possible to prevent the wind from the blower sent from the centrifugal fan from hitting another radiator on the way and not reaching the desired radiator it can. In other words, it is possible to anticipate the flow path from the blower part to the heat dissipator in the direction of the heat dissipator so as not to obstruct the air flow, minimizing airflow loss, The air can be efficiently sent out to the whole. Thereby, more air volume is obtained and the heat radiation efficiency is further improved.

  Furthermore, since there is a heat dissipation part with the same length in one heatsink and another heatsink, a set of heatsinks with several lengths can be configured with common parts as a heat dissipation part. It is possible to effectively suppress the mold cost when manufacturing the radiator. As a result, a more efficient and inexpensive cooling device can be provided.

  In the cooling device according to the second aspect of the present invention, since the heat dissipating member disposed in the exhaust part is formed with two or more lengths, the noise and the air volume become lower, and the heat dissipating effect can be further enhanced.

  In the cooling device according to the third aspect of the present invention, the amount of exhaust gas passing through the radiator and the heat radiation area can be arbitrarily controlled by changing the pitch of the radiator. For example, if the pitch of the heat dissipating body such as a heat pipe is intentionally shortened, the heat dissipating area is increased and the heat dissipating efficiency is increased. The heat carried by can be efficiently taken away.

  In the cooling device of the invention of claim 4, since the wind hits the wall portion and the wind can be directed in the flow path direction of the radiator, the wind efficiently passes through the radiator and further increases the air volume. Can be achieved.

  In the cooling device according to the fifth aspect of the present invention, since there is a portion of the exhaust portion where no heat radiating body is present, air resistance is not generated by the heat radiating body at that portion, and air passes smoothly. Therefore, the amount of exhaust air as a cooling device can be increased.

  In the cooling device according to the sixth aspect of the present invention, the heat transmitted from the heat receiving portion to the heat radiating portion is taken away by the wind passing from the air blowing portion to the heat radiating portion. The direction of the wind that has taken away this heat is different depending on the wind direction portion. Therefore, it is possible to direct the exhaust air as it is to a desired direction, for example, the exhaust hole of the housing that houses the cooling device.

  In the cooling device according to the seventh aspect of the present invention, even if the heat receiving portion and the heat radiating portion are separated, heat can be efficiently guided to the heat radiating portion by the transmission means.

  In the heat radiator of the invention of claim 8, if the duct having a triangular cross-section is formed by folding the plate-like body, the air escapes in the middle of the duct without using another member. The heat dissipation characteristics are significantly improved. In addition, since a radiator with a duct can be formed by a single plate, sufficient strength can be ensured, and a fastening part such as a claw is not required, so that it is possible to easily cope with a shape having a low height. Further, since the flat portions are formed at the upper and lower portions of the radiator, for example, a heat receiving portion that receives heat from a heat source can be thermally connected to the flat portions without loss, and the heat conduction characteristics can be improved.

  In the cooling device of the ninth aspect of the invention, each of the plurality of hole portions is provided with a receiving portion in a different direction, and the protrusions are respectively engaged with the receiving portions of the respective hole portions. Even if one member is moved in a certain direction, the engaging portion of the protrusion immediately hits the receiving portion of the hole portion, and further movement is restricted. As a result, rattling between the plurality of members is greatly reduced.

  In the cooling device according to the tenth aspect of the present invention, a sufficient insulation distance can be secured even when an electronic component or the like is disposed in the vicinity of the pin by using the resin-made pin for fixing to the object. Moreover, the cooling device can be easily fixed to the object simply by sandwiching the object between the fixing part and the flange by the biasing force of the elastic body.

  In the cooling device according to the eleventh aspect of the present invention, when the pin is inserted into the hole, the diameter changes toward the predetermined part inside the hole. A pin can be easily inserted into the part.

  In the cooling device according to the twelfth aspect of the present invention, even when a part or the like is arranged in the vicinity of the fixing part or the pin, the fixing part realizes fixing to the object by the pin at a position where the fixing part avoids the part by the notch part be able to.

  In the cooling device of the thirteenth aspect of the present invention, the heat receiving portion that abuts on the object and the mounting portion to be biased are configured as separate members, so that the biasing force of the elastic body acts on the mounting plate directly. Does not reach the heat receiving portion, and deformation of the heat receiving portion can be suppressed.

  In the cooling device according to the fourteenth aspect of the present invention, when the fixing member is fixed to the object by, for example, screw tightening, if the stopper hits the object, the fixing member receives the heat against the urging of the elastic body. It cannot be moved to the part side. Therefore, if the dimensions of the stopper are determined in advance so that the stopper abuts against the object before the heat receiving portion crushes the elastic body, excessive force is not applied to the object, and destruction of the object is avoided. The In addition, since this stopper is originally provided to prevent the fixing member from coming out of the heat receiving portion, the number of parts does not increase at all.

  In the cooling device according to the fifteenth aspect of the present invention, since each of the convex portions provided on the plate-like elastic body applies a load equally to the heat receiving body, the heat receiving section is less likely to tilt with respect to the heat source. And the heat receiving part can be improved.

  According to the first aspect of the present invention, it is possible to provide a cooling device with low noise, high air volume, and high heat dissipation efficiency even when an exhaust section in a plurality of directions is provided. Furthermore, the mold cost when manufacturing the heat radiator can be effectively suppressed by sharing parts.

  According to the second aspect of the present invention, the noise and the air volume become lower, and the heat dissipation effect can be further enhanced.

  According to invention of Claim 3, the exhaust_gas | exhaustion amount and heat dissipation area which pass a heat radiator can be controlled arbitrarily.

  According to invention of Claim 4, since a wind can be directed to the flow path direction of a heat radiator by a wall part, the further high air volume can be achieved.

  According to the fifth aspect of the present invention, it is possible to allow air to pass smoothly through the exhaust port where no heat radiator is present, and the amount of exhaust air as the cooling device can be increased.

  According to the invention described in claim 6, the exhaust air can be directed in a desired direction.

  According to invention of Claim 7, heat can be efficiently guide | induced to a thermal radiation body from a heat receiving part.

  According to the eighth aspect of the present invention, sufficient strength can be ensured by forming a single plate, and it is possible to easily cope with a shape having a low height, and to improve heat dissipation characteristics without requiring a separate member. Can do. Furthermore, the heat conduction characteristics can be improved by the flat portion.

  According to the ninth aspect of the present invention, the rattling between the plurality of members can be greatly reduced.

  According to the invention described in claim 10, workability at the time of fixing to the object can be improved, and a sufficient insulation distance from the electronic component mounted on the object can be secured.

  According to the eleventh aspect of the present invention, the pin can be easily inserted into the hole portion at the tip of the step portion.

  According to invention of Claim 12, fixation with the target object by a pin is realizable in the position where the fixing | fixed part avoided components.

  According to the thirteenth aspect of the invention, it is possible to prevent the heat receiving portion from being deformed when the heat receiving portion is thermally connected to the heat source, and to maintain good thermal conductivity.

  According to the fourteenth aspect of the present invention, it is possible to obtain a cooling device that prevents an excessive force from being applied to an object without increasing the number of parts.

  According to the fifteenth aspect of the present invention, the adhesiveness between the heat source and the heat receiving portion can be easily improved by simply providing a plurality of convex portions on the plate-like elastic body.

  Embodiments of the cooling device according to the present invention will be described below with reference to the accompanying drawings. In each embodiment, the same portions are denoted by the same reference numerals, and description of common portions is omitted as much as possible. The cooling device shown in each embodiment is housed in a thin electronic device having a built-in heat-generating component such as a notebook computer, but may be used in any device.

  FIG. 1 shows a first embodiment of the present invention. An outer member of a cooling device is formed into a thin and flat shape by a bottomed casing 1 and a cover (not shown) covering the upper surface opening of the casing 1. Composed. A blower unit 3 including a centrifugal fan 2 is provided inside the blower surrounded by the casing 1 and the cover. As is well known, the fan 2 includes a plurality of fan blades 5 around a rotor 4 having a cup shape, a magnet (not shown) attached to the inner peripheral surface of the rotor 4, The fan 2 rotates in the direction of the arrow R shown in FIG. 1 by an electromagnetic action with an enclosed motor portion (not shown).

  An air inlet 7 is formed on the bottom surface of the casing 1 so as to face the lower surface of the fan 2. Similarly, although not shown here, another air inlet is formed in the cover so as to face the upper surface of the fan 2, and air is taken into the blower unit 3 from both surfaces of the fan 2. In addition, two exhaust ports 8 and 9 are provided in different directions on the side surface of the casing 1 orthogonal to the intake port 7. The exhaust ports 8 and 9 form a flow path for discharging the air sent from the fan 2 to the outside of the blower, but may be provided in the direction of the side portion 3 of the blower unit 3 or more. In the present embodiment, exhaust ports 8 and 9 are provided on two adjacent sides of the peripheral side surface of the blower unit 3 and the other two sides are connected by an R-shaped curved surface portion 10. May be provided on two opposite sides.

  The first exhaust port 8 includes a plurality of fin materials 11A formed by bending a metal plate and a plurality of fin materials 11B formed by bending the metal plate in a different shape from the fin material 11A. A radiating fin 13 is provided and connected. Further, another second exhaust port 9 is also provided with heat radiating fins 14 formed by arranging a plurality of fin materials 11C formed by bending a metal plate. The fin members 11A to 11C are arranged side by side in the direction that does not obstruct the flow of air discharged from the side surface of the blower unit 3 as much as possible, that is, in the width direction of the exhaust ports 8 and 9.

  In this embodiment, at least the heat dissipating fins 13 arranged at the first exhaust port 8 are formed of fin materials 11A and 11B having different lengths along the direction in which the wind flows. More specifically, although the outlet surfaces of the radiating fins 13 from which the air is discharged are arranged in a straight line for both fin materials 11A and 11B, the inlet surfaces of the radiating fins 13 into which the air enters are fins having different lengths. A step is generated by the materials 11A and 11B. That is, here, the two types of fin materials 11A and 11B having different lengths are arranged so that the distance from the outer periphery of the fan blade 5 to the inlet surface of the radiating fin 13 is as constant as possible in the width direction of the radiating fin 13. ing. On the other hand, the radiating fins 14 disposed in the second exhaust port 9 are formed of only one kind of fin material 11C, and the inlet surface and the outlet surface thereof are aligned in a straight line.

  Preferably, the fin portion 16A in which the plurality of fin materials 11A are arranged and connected and the fin portion 16C in which the plurality of fin materials 11C are arranged and connected have the same length along the direction in which the wind flows. If it carries out like this, fin material 11A, 11C can be made into the same member, and sharing of components is achieved. Of course, instead of the fin portion 16A, a fin portion 16B in which a plurality of fin materials 11B are arranged and joined may be formed to have the same length as the fin portion 16C.

  Next, the effect | action is demonstrated about the said structure. When the fan 2 that constitutes the air blowing unit 3 rotates in the direction of the arrow R about the rotation axis, the air around the outside of the cooling device is taken into the air blowing unit 3 from the air inlet 7. The air is sent out in the radial direction of the outer periphery of the fan blade 5 which is the blade portion of the fan 2 and passes between the fin materials 11A to 11C of the heat radiation fins 13 and 14 provided at the exhaust ports 8 and 9, respectively, to be cooled. It is discharged outside the device. In FIG. 1, arrows F1, F2, and F3 indicate the flow of air from the fan 2 toward the radiating fins 13 and 14, respectively. As shown in the figure, in the case of the centrifugal fan 2, wind is sent out in the direction of rotation of the fan blade 5 in the tangential direction of the outermost periphery of the fan blade 5.

  Here, paying attention to the radiating fins 13, the steps on the inlet side of the fin materials 11A and 11B are considered so that the wind F1 from the outer periphery of the fan 2 toward one end of the fin portion 16A is not disturbed by another fin portion 16B. . Therefore, by keeping the distance between the outer periphery of the fan blade 5 and the inlet face of the radiating fin 13 constant, one end of the fin portion 16A in the vicinity of the step portion is suppressed while suppressing an increase in local noise on the inlet face of the radiating fin 13. By securing a flow path that sufficiently delivers the wind F1 to the part, it is possible to suppress the loss of the air volume. Further, in this embodiment, the position of the inlet surface of the fin portion 16A and the length of the fin portion 16A are set so that the wind F2 toward the fin portion 16C of the other heat radiating fin 14 is not disturbed by the other end portion of the fin portion 16A. Be considered. Therefore, a flow path that sufficiently delivers the wind F2 to the end portion of the fin portion 16C can be secured also here.

  As described above, in this embodiment, the air blowing part 3 provided with the exhaust ports 8 and 9 as exhaust parts in a plurality of directions is provided, and the heat radiation fins 13 and 14 as heat radiators are respectively provided in the exhaust ports 8 and 9. In the cooling device to be arranged, at least one radiating fin 13 is formed in two or more lengths, and one radiating fin 13 and another radiating fin 14 are provided with fin portions 16A and 16C having the same length. Provided.

  In this way, the distance from the outer periphery of the fan blade 5 in the blower section 3 to the inlet surface of the radiating fin 13 can be appropriately maintained by making the length of at least one radiating fin 13 different from two or more. Further, it is possible to avoid the deterioration of noise performance due to the distance between the outer periphery of the fan blade 5 and the heat radiating fins 13 and 14, and to realize low noise. Further, since the heat dissipating fins 13 and 14 are partially formed in accordance with the outer peripheral shape of the fan blade 5, the heat dissipating area is increased accordingly, and the heat dissipating efficiency can be enhanced.

  Further, when the blower unit 3 includes the centrifugal fan 2 as in this embodiment, the wind is sent out in the direction in which the fan blade 5 rotates and in the tangential direction of the outermost periphery of the fan blade 5 (see FIG. 1 wind F1, F2). Therefore, by changing the length of at least one radiating fin 13 to two or more types, the wind from the blower unit 3 sent out from the fan 2 hits another radiating fin 13 on the way and does not reach the desired radiating fin 14. You can avoid that. In other words, it is possible to predict the flow path from the blower 3 toward the heat radiating fins 13 and 14 disposed at the exhaust ports 8 and 9 so as not to obstruct the air flow, and minimize the loss of air flow. Therefore, air can be efficiently sent out to the entirety of each of the radiating fins 13 and 14. Thereby, more air volume is obtained and the heat radiation efficiency is further improved.

  Further, since one heat radiating fin 13 and another heat radiating fin 14 have fin portions 16A and 16C having the same length, one set of heat radiating fins 13 and 14 having several lengths is connected to the fin portion 16A, 16C can be composed of common parts (fin materials 11A and 11C), and the mold cost when manufacturing the radiation fins 13 and 14 can be effectively suppressed. As a result, a more efficient and inexpensive cooling device can be provided.

  FIG. 2 shows a second embodiment of the present invention. Here, a fin material 11C formed by bending a metal plate at the second exhaust port 9 and a shape different from that of the fin material 11C are the same. Radiation fins 14 are provided in which a plurality of fin members 11D formed by bending a metal plate are connected in parallel. The fin materials 11C and 11D are different in length along the direction of the flow of the wind, as in the fin materials 11A and 11B of the heat dissipating fins 13 disposed in the first exhaust port 8, and the air is discharged. Although the exit surfaces of the heat dissipating fins 14 are linearly aligned with each of the fin materials 11C and 11D, the entrance surfaces of the heat dissipating fins 14 into which air enters are stepped by the fin materials 11C and 11D having different lengths. . That is, the two types of fin materials 11C and 11D having different lengths are arranged so that the distance from the outer periphery of the fan blade 5 to the inlet surface of the radiating fin 14 is as constant as possible in the width direction of the radiating fin 14. .

  The heat radiating fins 14 are constituted by a fin portion 16C in which a plurality of fin materials 11C are arranged and connected, and a fin portion 16D in which a plurality of fin materials 11D are arranged and connected. Further, here, the fin portion 16B forming a part of one radiating fin 13 and the fin portion 16C forming a part of another radiating fin 14 are formed to have the same length along the direction in which the wind flows. If it carries out like this, fin material 11B, 11C can be made into the same member, and sharing of components is achieved.

  Further, in this embodiment, the convex portion 18 as a wall portion for directing the wind F3 flowing from the outer periphery of the fan blade 5 to the peripheral side surface where the exhaust ports 8 and 9 of the blower portion 3 are not provided is directed toward the flow path of the radiating fin 14. Is formed on the peripheral side surface (inner surface) of the blower section 3. The convex portion 18 may be provided in another part, or may be formed in a concave shape, for example. In short, any shape may be used as long as the air flowing from the outer periphery of the fan blade 5 can be applied and directed toward the flow path of the radiating fins 13 and 14. Other configurations are the same as those in the first embodiment.

  In this embodiment, when the fan 2 constituting the air blowing unit 3 rotates in the direction of the arrow R, the air around the outside of the cooling device is taken into the air blowing unit 3 from the air inlet 7. The air is sent out in the radial direction of the outer periphery of the fan blade 5 which is the blade portion of the fan 2 and passes between the fin materials 11A to 11D of the heat radiating fins 13 and 14 provided in the exhaust ports 8 and 9, respectively. It is discharged outside the device.

  Here, paying attention to the radiating fins 14, the wind F <b> 2 toward the fin portion 16 </ b> C is prevented from being disturbed by the other end portion of the fin portion 16 </ b> A that forms a part of another radiating fin 13. As a result, the lengths of the fin portions 16A and 16C are taken into consideration. Therefore, a flow path that sufficiently delivers the wind F2 to the fin portion 16C of the heat radiating fin 14 is secured, and the loss of the air volume can be suppressed. In addition, the distance from the outer periphery of the fan blade 5 to the inlet surfaces of the radiating fins 13 and 14 is kept substantially constant, and local noise is generated not only at one radiating fin 13 but also at the inlet surface of another radiating fin 14. Can be suppressed. Furthermore, in the present embodiment, the wind F3 flowing from the outer peripheral tangent direction of the fan blade 5 directly hits the convex portion 18 and is directed in the flow path direction of the radiation fins 14. Therefore, the exhaust air volume of the exhaust port 9 provided with the heat radiating fins 14 can be easily increased only by providing the convex portion 18.

  As described above, in the present embodiment, in the cooling device that includes the air blowing unit 3 provided with the exhaust ports 8 and 9 in a plurality of directions and in which the radiation fins 13 and 14 are respectively disposed in the exhaust ports 8 and 9, at least Not only one radiating fin 13 but also each radiating fin 13, 14 arranged at the exhaust ports 8, 9 is formed in two or more lengths.

  In this case, since the effects as described in the first embodiment can be obtained, the radiating fins 13 and 14 disposed at the exhaust ports 8 and 9 are both formed in two or more lengths. In each part around the radiating fins 13 and 14, the noise and the air volume become lower, and the radiating effect can be further enhanced.

  Further, in the present embodiment, a convex portion 18 as a wall portion for directing the wind in the direction of the flow path of the radiating fin 14 is provided on the inner surface of the blower portion 3. In this way, the wind from the blower unit 3 hits the convex portion 18 and can direct the wind toward the flow path of the radiating fins 14, so that the wind efficiently passes through the radiating fins 14 and further increases the air volume. Can be achieved.

  FIG. 3 shows a third embodiment of the present invention, in which the pitch between the fin materials 11C and 11D constituting the radiating fin 14 is narrower than the pitch between the fin materials 11C and 11D constituting the radiating fin 14. In addition, the second embodiment is the same as the second embodiment except that the pitch (distance) of the gap through which the air passes is different for each of the radiating fins 13 and 14.

  In this case, since the heat dissipation fins 13 have less air resistance due to the wider pitch, the air from the blower unit 3 can easily pass through, and a larger exhaust air volume can be obtained. On the contrary, the heat radiation fins 14 having a narrow pitch have a slightly larger air resistance than the heat radiation fins 13, but the number of fin portions 16C and 16D is increased and the heat radiation area is increased. Even when the end portion of the heat pipe is thermally connected to the radiating fin 14, heat can be efficiently removed from the heat pipe. Further, by providing the radiating fins 14 with the projections 18 that direct the wind F3, a sufficient exhaust airflow can be obtained even for the radiating fins 14 having a narrow pitch.

  As described above, the cooling device according to the present embodiment changes the pitch of the gap through which air passes for each of the radiating fins 13 and 14. In this way, the effects of the first and second embodiments are exhibited, and the pitch of the radiating fins 13 and 14 is changed, so that the exhaust amount passing through the radiating fins 13 and 14 and the heat radiating are changed. The area can be controlled arbitrarily. For example, if the pitch of the heat dissipating fin 14 in contact with a heat transport means such as a heat pipe is intentionally shortened, the heat dissipating area is increased and the heat dissipating efficiency is increased. The heat carried by the transportation means can be efficiently taken away.

  Here, FIG. 4 and FIG. 5 show the flow rate-wind pressure characteristics and the fan speed-noise level characteristics when the number of fin members 11A to 11D of the radiating fins 13 and 14 shown in FIG. Show. In the figure, the dotted line shows the measurement result when the total number of fin materials 11A and 11B constituting the heat radiation fin 13 is 12, and the total number of fin materials 11C and 11D constituting the heat radiation fin 14 is 8 (before optimum). The solid line shows the measurement results when the total number of fin materials 11A and 11B is nine and the total number of fin materials 11C and 11D is six (after optimum).

  As shown in FIG. 4, the flow rate at the same wind pressure (or the wind pressure at the same flow rate) is increased by widening the pitch of the radiation fins 13 and 14. Note that the speed of the fan 2 here is constant at 3500 rpm. Further, as shown in FIG. 5, when the pitch of the heat dissipating fins 13 and 14 is increased, noise particularly in a low speed region is reduced. From these measurement results, it is possible to obtain the optimum exhaust air volume and noise characteristics by appropriately changing the pitch of the radiating fins 13 and 14.

  FIG. 6 shows a fourth embodiment of the present invention. Here, in addition to the exhaust ports 8 and 9, another exhaust port 19 in which no heat radiating fins are arranged is provided, and further wind flows from here. It can be sent out. Further, the radiating fins 14 in the exhaust port 9 are also only partially disposed in the exhaust port 9, and a hole 20 that is discharged to the outside without passing through the radiating fins 14 is formed. Since the air passing through the hole 20 is discharged as it is without being subjected to resistance, it is possible to increase the amount of exhaust air as a cooling device in the same manner as the air discharged from the exhaust port 19. The other configuration is common to the cooling device shown in the third embodiment.

  In the present embodiment, an exhaust port 9 in which some radiating fins 14 do not exist and an exhaust port 19 in which no radiating fins exist are further provided. In this case, since there is a portion of the exhaust ports 9 and 19 where the radiating fins 14 are not present at all or at all, air resistance is not generated by the radiating fins 14 at that portion, and air passes smoothly. Therefore, the amount of exhaust air as a cooling device can be increased.

  FIG. 7 is a perspective view of an essential part of a cooling device showing a fifth embodiment of the present invention. In the figure, reference numeral 21 denotes a blower unit incorporating a fan (not shown), and heat radiating fins 22 are arranged in the blower direction of the blower unit 21. In addition, although the radiation fin 22 of the present embodiment is provided in the exhaust direction of the blower unit 21, it may be provided in the intake direction. In order to reduce the weight, the radiating fin 22 is not a die-cast integrated structure, but is formed by laminating a plurality of fin members 23 arranged in parallel. Each fin material 23 has the same shape, and has bent portions 25A and 25B formed at the upper and lower ends of the heat radiating portion 24, and an inclined portion 26 bent at the outlet side of the radiating fin 22. . The bent portion 25B and the inclined portion 26 may be bent by drawing, or may be formed by inserting a split groove (not shown) between the bent portion 25B and the inclined portion 26. . And the front-end | tip of these bending parts 25A and 25B and the inclination part 26 abuts on the back surface of the adjacent fin material 23, and is fixed. The connection and fixing between the fin members 23 and 23 can be realized by caulking, for example, in addition to bonding, welding, and soldering.

  The radiating fin 22 is formed with an inlet 27 for taking in air facing an exhaust port (not shown) of the blower unit 21 and an outlet 28 for discharging air in a direction orthogonal to the inlet 27. The The inclined portion 26 forming a part of the fin material 23 functions as a wind direction portion that changes the flow of wind (air blowing direction) passing through the heat radiating fins 22. Although the wind direction portion in the present embodiment rises in an oblique straight line from the lower end of the radiating fin 22, it may be raised with a gentle curve, for example, and its shape is not particularly limited.

  Reference numeral 29 denotes a heat receiving plate as a heat receiving portion in contact with the heat source S such as an MPU. In the example shown in FIG. 7, the heat receiving plate 29 is directly connected and fixed to the bent portion 25B forming the bottom surface of the radiation fin 22. The heat receiving plate 29 is composed of a member having excellent heat conductivity. For example, as shown in FIG. 8, the heat receiving plate 29 is connected to a bent portion 25B of the heat radiating fin 22 through a heat pipe 30 which is a heat transfer means. Also good. The heat pipe 30 injects a very small amount of hydraulic fluid into a tube body such as copper having excellent thermal conductivity, and circulates this hydraulic fluid inside the tube body. It is extremely superior to the hydraulic fluid moving at the speed of sound. Thermal responsiveness is obtained. In the modification shown in FIG. 8, the heat receiving plate 29 is thermally connected to one end of the heat pipe 30, and the radiating fins 22 are thermally connected to the other end of the heat pipe 30.

  In the example shown in FIG. 7, heat generated from the heat source S is conducted directly from the heat receiving plate 29 to the heat radiation fins 21, and in the example shown in FIG. 8, heat generated from the heat source S is transferred from the heat receiving plate 29 to the heat pipe 30. Is conducted to the heat radiating fins 22. At the same time, when air is blown from the blower portion 21 toward the inlet 27 of the radiating fin 22, the air that has entered from the inlet 27 passes between the fin members 23 and 23 while taking away the heat that has reached the radiating fin 22. Then, it reaches the inclined portion 26, where the flow of wind is changed from horizontal to vertical, and the air is smoothly discharged from the outlet 28 at the upper rear end of the radiating fin 22. In particular, even when the cooling device is in the center of the casing of the thin electronic device and the exhaust holes have to be provided on the top and bottom surfaces of the housing, the outlets 28 of the radiating fins 22 can be directly opposed to the exhaust holes. Further, since the inclined portion 26 is formed as a part of the heat radiation fin 22 in which the plurality of fin materials 23 are laminated, the cooling effect as the heat radiation fin 22 is not impaired, and as a result, the heat source S can be efficiently cooled. it can.

  As described above, as the fin material 23 constituting the heat radiating fin 22, the inclined portions 26 that change the blowing direction are laminated one by one together with the fin material 23, so that the cooling device is provided in the housing with limited space. Even when the heat source S is provided, the heat source S can be efficiently cooled while the weight of the heat dissipating fins 22 is maintained. In addition, by connecting the fin material 23 individually by caulking or the like, it is possible to assemble the radiating fin 22 having the inclined portion 26, so the manufacturability and assemblability as the radiating fin 22 are not different from the conventional ones, There is no deterioration.

  As described above, according to the present embodiment, the heat receiving plate 29 as the heat receiving portion in contact with the heat source S, the air blowing portion 21, and the heat radiating portion in the air blowing direction of the air blowing portion 21 take away heat from the heat receiving plate 29. In the cooling device having the heat radiation fins 22 as the laminated fins, the heat radiation fins 22 are formed with inclined portions 26 as wind direction portions that change the blowing direction.

  In this case, the heat transmitted from the heat receiving plate 29 to the radiating fins 22 is taken away by the wind passing through the radiating fins 22 from the blower unit 21, but the direction of the wind that has taken away this heat is changed to another direction by the inclined portion 26. Therefore, it is possible to direct the exhaust air as it is to a desired direction, for example, the exhaust hole of the housing that houses the cooling device. Moreover, since the inclined portion 26 is formed on the heat dissipating fin 22 in which a plurality of fin materials 23 are laminated, there is almost no increase in weight, and there is no need to change the wind direction using a separate part. Further, the cooling effect, assemblability, and manufacturability of the radiating fins 22 are not impaired.

  In particular, in the example shown in FIG. 8, the heat receiving plate 29 and the radiating fins 22 are connected by a heat pipe 30 that is a heat transfer means. In this way, even if the heat receiving plate 29 and the heat radiating fins 22 are separated from each other, the heat pipe 30 can efficiently conduct heat to the heat radiating fins 22.

  As another modification, the inclined portion 26 shown in FIGS. 7 and 8 may be partially provided instead of the entire fin material 23, and the remaining fin material 23 may not be provided with the inclined portion 26. . In this way, the air outlets from the radiation fins 22 can be divided into two in the vertical direction and in the horizontal direction, and it becomes possible to deal with finer arrangement of components inside the housing.

  9 to 12 show a sixth embodiment of the present invention. FIG. 9 is a perspective view of the radiating fin 31 in the present embodiment, and the radiating fin 31 is formed by bending a rectangular thin plate having excellent thermal conductivity such as metal. The material and thickness of the thin plate may be selected preferably in consideration of overall thermal conductivity, strength, bendability and the like.

  In this embodiment, the thin plate is folded so that one or more ducts 34 having a triangular cross section and closed except for the air inlet 32 and outlet 33 are formed. At the same time, one side of each duct 34 forms a substantially flat portion (flat surface) 35 that continues to the upper and lower portions of the radiating fins 31.

  As shown in FIGS. 10 to 12, the radiating fins 31 formed of a single thin plate in this manner are preferably disposed in a cooling device including a blower unit 36 having a centrifugal fan. In each of these drawings, the air blowing part 36 is disposed on a plate-shaped heat sink 37, and the heat radiation fin 31 having the structure shown in FIG. 9 is disposed on the heat receiving plate 38 which is a heat receiving part formed on one side of the heat sink 37. Is done. 39 is a cover as a duct part that covers the upper part of the heat sink 37 including the heat receiving plate 38, and the heat sink 37 and the cover 39 constitute an outer member of the cooling device having the exhaust hole 40 on one side. The radiating fin 31 has an inlet 32 facing a side surface of a blower 36 as a fan motor, and an outlet 33 facing an exhaust hole 40 of the cooling device.

  The heat sink 37 and the cover 39 are positioned in the direction of the rotation axis of the fan that constitutes the air blowing part 36, and are each provided with an intake hole 41. In addition, in order to form a part of the duct (air flow path) from the air blower 36 to the exhaust hole 40, the heat dissipating fin 31 forms a notch 42 that substantially matches the outer shape of the flat surface 35 with a part of the cover 39. Is formed. As a result, the flat surface 35 on the upper portion of the radiation fin 31 is exposed from the cover 39 of the cooling device, and the flat surface 35 and the upper surface of the cover 39 are formed substantially flush with each other.

  The heat receiving plate 38 is directly connected to another flat surface 35 below the heat radiating fins 31. In this case, since the upper surface of the heat receiving plate 38 is also substantially flat, the thermal connectivity between the heat receiving plate 38 and the radiation fins 31 is extremely good. Of course, the heat sink 37 and the heat receiving plate 38 may be configured as separate members. For example, the heat receiving plate 38 and the heat radiating fins 31 may be connected by a heat pipe (not shown). Also in this case, for example, if the flat part is formed by crushing the end of the heat pipe, a good thermal connection with the radiation fin 31 can be realized.

  Next, the operation of the above configuration will be described. When the fan constituting the air blowing unit 36 rotates in one direction around the rotation axis, air on both sides (upper side and lower side) of the outer periphery of the cooling device The air is taken into the air blowing part 36 through the air intake holes 41 provided in the cover 37 and the cover 39 respectively. The air is sent out in the radial direction of the outer periphery of the blower 36, passes through a duct formed by the heat radiating fin 31, the cover 39, and the heat sink 37, and is discharged to the exhaust hole 40 in the direction orthogonal to the intake hole 41. The

  In this series of processes, when the heat source S connected to the heat receiving plate 38 generates heat, the heat reaches the radiation fins 31 directly from the heat receiving plate 38. At this time, the air moving in the horizontal direction from the side of the heat radiating portion 36 to the inlet 32 of the heat radiating fin 31 takes the heat transmitted to the heat radiating fin 31 while passing through the respective ducts 34 and escapes in the middle. Without exit 33. Therefore, the heat source S can be quickly and efficiently cooled by the radiation fins 31 made of a single thin plate.

  In the example shown in FIG. 43, the upper side of the radiating fin 524 needs to be covered with the cover 39 or other parts in order to close the upper open portion of the radiating fin 524 to form a duct. Since the radiating fin 31 itself forms the air flow path from the inlet 32 to the outlet 33 as the duct 34, it is not necessary to cover the flat surface 35 at the upper part or the lower part of the radiating fin 31. Therefore, as shown in FIG. 10, the flat surface 35 on the upper side of the radiation fin 31 can be exposed by the notch 42, and the height direction of the radiation fin 31 can be enlarged. Further, the heat transmitted to the heat radiation fins 31 can be naturally radiated H1 (see FIG. 12) from the exposed flat surface 35, and the heat radiation characteristics can also be improved in this respect.

  As described above, in this embodiment, in the heat dissipating fin 31 formed by continuously folding a plate having good thermal conductivity, that is, a thin plate, a duct 34 having a triangular cross section is formed by folding the thin plate. The flat surfaces 35 that are flat portions are formed on the upper and lower portions of the radiating fins 31.

  In this way, if the thin plate is folded and the duct 34 having a triangular cross section is formed by the heat radiating fin 31 itself, air does not escape in the middle of the duct 34 without using another member, and the heat radiation characteristics are improved. Remarkably improved. Further, since the heat dissipating fin 31 with the duct 34 can be formed by a single thin plate, sufficient strength can be secured, and a fastening portion such as a claw is not necessary, so that it is possible to easily cope with a low height shape. Furthermore, since the flat surfaces 35 are formed above and below the heat radiation fins 31, for example, a heat receiving portion that receives heat from a heat source can be thermally connected to the flat surfaces without loss, and heat conduction characteristics can be improved.

  In this embodiment, the radiating fin 31 incorporated in the cooling device has been described. However, it may be separate from the cooling device, and may be applied to other devices than the cooling device.

  13 to 16 show a seventh embodiment of the present invention. In each of these drawings, the outer shell of the cooling device is preferably formed by fixing a resin cover 45 to a resin case 45, preferably a metal cover 46 by, for example, ultrasonic welding. Here, a plurality of cylindrical bosses 48 as projections are provided on the upper end surface of the case 45 which is the first member, and a plurality of circular holes 49 are provided corresponding to these bosses 48. Reference numeral 50 denotes an intake hole provided facing a blower (not shown).

  In the present embodiment, receiving portions 51 for restricting horizontal movement of the case 45 or the cover 46 are formed in the holes 49 in different directions. Corresponding to the receiving portion 51, a convex or concave engaging portion 52 (see FIG. 15A) accompanying ultrasonic welding is formed on the boss 48 provided on the case 45. For example, in the example shown in FIG. 14, each of the receiving portions 51 is formed as a convex hole 51A communicating with the hole 49. However, as shown here, a part or all of the convex hole 51A is formed on the end surface of the cover 46. It may be extended to a groove shape. The receiving portion 51 may have a different shape for each hole 49.

  FIG. 16 shows various modifications of the receiving unit 51. As shown in FIG. 16A, a convex hole 51A communicating with one side of the hole 49 may be used as the receiving portion 51. As shown in FIG. 16B, the convex hole 51A is separated from the same hole 49. It may be provided in two different directions. In FIG. 16C and FIG. 16D, a triangular hole 51B and a round hole 51C are provided in place of the rectangular convex hole 51A. That is, the hole shape as the receiving portion 51 is not particularly limited. Further, in FIG. 16E, a recess 51D toward the hole 49 is used as the receiving portion 51. The recess 51D may be provided not only on one side of the hole 49 but also in two different directions.

  In this embodiment, when assembling the outer shell of the cooling device, for example, when the plate-like cover 46 is placed on the upper surface of the case 45 so that the respective holes 49 are fitted to the bosses 48, the holes 49 are connected to the bosses 48. The upper part protrudes, and the cover 46 is fixed to the case 45 by crushing the protruding part with an ultrasonic welder (not shown) to form the flange part 53. In this case, the diameter of the hole 49 is about 0.3 mm to 0.5 mm larger than the outer diameter of the boss 48, and the boss 48 is inserted into the hole 49 with a slight gap 54. A case material (resin) by ultrasonic welding enters the receiving portion 51 cut out in the notch, and a convex engaging portion 52 that engages with the receiving portion 51 is formed. FIG. 15 shows the state of the boss 48 and its surroundings after ultrasonic welding.

  When the cover 46 is moved in the horizontal direction with respect to the case 45, the side surface of the engaging portion 52 comes into contact with the receiving portion 51 provided in a direction different from that direction. Moreover, since the receiving portions 51 provided in the respective holes 49 are directed in different directions, the engaging portion 52 is eventually attached to any one receiving portion 51 regardless of the direction in which the cover 46 is moved. When it hits, further movement is restricted.

  As described above, in this embodiment, a plurality of members (the case 45 and the cover 46) that form an outer shell are formed by the bosses 48 that are a plurality of protrusions and the holes 49 that serve as the holes inserted into the bosses 48, for example. In the fixing cooling device, each hole 49 is provided with a receiving portion 51 facing in a different direction in which the engaging portion 52 formed on the boss 48 can be engaged.

  In this way, each of the plurality of holes 49 is provided with receiving portions 51 in different directions, and the bosses 48 are respectively engaged with the receiving portions 51 of the respective holes 49. For example, even if the cover 46 is moved in a certain direction, the engaging portion 52 of the boss 48 abuts on the receiving portion 51 of the hole 49 immediately, and further movement is restricted. As a result, the rattling between the two members forming the outline is greatly reduced.

  17 to 22 show an eighth embodiment of the present invention. First, the configuration of the cooling device 61 will be described with reference to FIGS. 17 to 19. The outer periphery of the cooling device 61 includes a fan base 63 to which a blower 62 is attached and a fan cover made of, for example, resin that covers the upper surface of the fan base 63. And 64. As is well known, the air blowing part 62 is composed of a motor part 65 including a stator and a fan 66 that is rotated by a driving force from the motor part 65, and is located above and below the air blowing part 62. Air is taken in from the intake holes 67 and 68 provided in the base 63 and the fan cover 64, and air is sent out to the exhaust holes 69 in a direction orthogonal to the intake holes 67 and 68.

  Reference numeral 71 denotes a fixing portion that is a leg portion that protrudes downward from the fan cover 64 to the cooling device 61. The fixing portion 71 is provided at, for example, the four corners of the cooling device 61, and has holes 73 through which resin pins, that is, lock pins 72 are inserted. Apart from the fixing portion 71, one or more component pressing portions 75 whose lower ends abut against the surface of a substrate 74 described later are provided so as to protrude below the cooling device 61 from the fan cover 64. The fixing part 71 and the part pressing part 75 here are both formed integrally with the fan base 63, but may be separate.

  The lock pin 72 is formed of an electrically insulated resin, and has a rod-shaped shaft portion 72A, a cap-shaped head portion 72B at the proximal end of the shaft portion 72A, and a flange portion 72C at the proximal end of the shaft portion 72A. It consists of. A coiled spring 77 is inserted into the shaft 72A of the lock pin 72 so as to be extendable and contractible. On the other hand, the hole 73 formed in the fixing portion 71 has a small-diameter portion 73A into which only the shaft portion 72A of the lock pin 72 can be inserted, and a larger diameter than the small-diameter portion 73A. Is formed by a large-diameter portion 73B through which a small diameter portion 73A and a large-diameter portion 73B are formed. In particular, on the lower side of the large-diameter portion 73B, a tapered portion 79 in which the hole diameter gradually decreases toward the small-diameter portion 73A and then the stepped portion 78 is formed. When the lock pin 72 with the spring 77 is inserted from the large diameter portion 73B side of the hole 73, the tapered portion 79 naturally guides the collar portion 72C at the tip of the lock pin 72 to the small diameter portion 73A. It is for doing so.

  A cutout portion 80 is formed at the lower end portion of the fixing portion 71 as necessary (see FIG. 19). The notch 80 is provided in order to prevent the component 81 mounted on the board 74 from interfering with the fixing portion 71. Therefore, the shape of the notch 80 may be appropriately determined in consideration of the outer shape of the component 81. Although the fixing portion 71 in this embodiment extends in a leg shape, a hole 73 is provided in a part of the flat outer shell (fan base 63 or fan cover 64), and the outer portion including the hole 73 is fixed. It may be completed as a part.

  Next, the configuration of the substrate 74 to which the cooling device 61 is attached will be described with reference to FIG. As is well known, the substrate 74 as a fixed object is formed by etching a conductive pattern such as a copper foil on one or both surfaces of an insulating base material such as glass epoxy. FIG. 20 shows a first semiconductor 82 that is a heat-generating component, a second semiconductor 83 that is slightly smaller than the first semiconductor 82 and also a heat-generating component, and one or more electrons in the vicinity of the through hole 84. Although a state in which the component 85 is mounted on the substrate 74 is shown, various components are actually mounted on the entire surface of the substrate 74 at high density. The through hole 84 has a shape in which the flange 72C of the lock pin 72 is inserted against elasticity. Further, for example, a metal heat dissipating plate 86 made of a member having good thermal conductivity is provided so as to cover the upper surfaces of the plurality of second semiconductors 83.

  Next, the operation of this embodiment will be described with reference to FIGS. 21 and 22 showing the state in which the cooling device 61 is assembled to the substrate 74. When the cooling device 61 is attached to the surface of the substrate 74, first, a lock pin 72 having a spring 77 attached in advance to the hole 73 of each fixing portion 71 formed integrally with the fan cover 64 from the upper end side of the large diameter portion 73B. Insert the buttocks 72C first. In this insertion process, the diameter of the hole 73 is gradually reduced by the taper portion 79 from the upper diameter large portion 73B toward the lower diameter small portion 73A. It is easily guided to the small-diameter portion 73A and hits there once. When the head 72B of the lock pin 72 protruding from the upper end of the large diameter portion 73B is pushed in, the collar portion 72C is elastically deformed and enters the small diameter portion 73A, and the collar portion 72C is inserted from the lower end of the small diameter portion 73A. Protruding. When the head portion 72B of the lock pin 72 is further pushed in and the entire collar portion 72C comes out of the small diameter portion 73A and is elastically restored, the collar portion 72C of the lock pin 72 is fixed as long as the collar portion 72C is not crushed by an external force. It becomes impossible to extract the lock pin 72 by hitting the bottom surface of 71. Further, in this state, the collar portion 72 </ b> C is placed on the bottom surface of the fixing portion 71 by a spring 77 sandwiched between the head portion 72 </ b> B of the lock pin 72 and the stepped portion 78 formed in the inner periphery of the hole 73 of the fixing portion 71. The lock pin 72 is constantly urged in the abutting direction (upward direction).

  Next, the cooling device 61 is temporarily placed on the surface side of the substrate 74 so that the flange portion 72 </ b> C of the lock pin 72 coincides with the through hole 84 of the substrate 74. From this state, when the heads 72B of the respective lock pins 72 are pushed into the substrate 74 against the bias of the springs 77, the collar portions 72C are elastically deformed and enter the through holes 84. When the entire collar part 72C penetrates from 84 and returns elastically, the collar part 72C of the lock pin 72 abuts against the bottom surface of the substrate 74 and the lock pin 72 cannot be extracted unless the collar part 72C is crushed by an external force. Become. At the same time, the elastic force of the spring 77 acts, the substrate 74 is sandwiched between the fixing portion 71 and the flange portion 72C of the lock pin 72, and the cooling device 61 is fixed on the substrate 74.

  FIGS. 21 and 22 show a state in which all the lock pins 72 are engaged with the substrate 74. In order to increase the mounting density of the board 74, an electronic component 81 is disposed in the vicinity of the through hole 84. However, since the fixing portion 71 of the lock pin 72 and the fan cover 64 is made of resin, Insulation is ensured, and the notch 80 provided corresponding to the component 81 allows the fixing portion 71 to be fixed to the substrate 74 by the lock pin 72 at a position where the component 81 is avoided.

  In this state, the component pressing portion 75 provided on the fan cover 64 has a structure for pressing the heat radiating plate 86 that takes heat from the second semiconductor 83 and cools it from the upper surface. Therefore, it is possible to suppress the floating of the heat radiating plate 86 and improve the adhesion with the second semiconductor 83, and the heat radiating effect by the heat radiating plate 86 is improved.

  Then, when the fan 66 is rotated with the cooling device 61 attached to the substrate 74, relatively cool air around the upper portion of the cooling device 61 is taken in from the intake hole 67 and generated from the first semiconductor 82. Due to the heat generated and the heat efficiently transmitted from the second semiconductor 83 to the heat radiating plate 86, air that is relatively warmed around the upper portion of the cooling device 61 is taken in from another intake hole 68. These airs are integrated in the air blowing unit 62 and are discharged from the exhaust hole 69 on one side of the cooling device 61, thereby effectively suppressing the temperature rise of the first semiconductor 82 and the second semiconductor 83. Can do.

  As described above, the cooling device 61 according to the present embodiment is a resin that can be inserted into the fixing portion 71 having the hole 73 that is the hole portion, and the retaining flange portion 72C at the tip thereof. A spring as an elastic body that urges the lock pin 72 in a direction to come out from the hole 73 and pinches the substrate 64 that is an object to be fixed between the fixing portion 71 and the collar portion 72C. And 77.

  As described above, by using the resin lock pin 72 for fixing to the substrate 64, a sufficient insulation distance can be secured even when the electronic component 81 or the like is disposed in the vicinity of the lock pin 72. Moreover, the cooling device 61 can be simply fixed to the substrate 74 by simply holding the substrate 64 between the fixing portion 71 and the collar portion 72C by the biasing force of the spring 77, eliminating the trouble of turning a conventional screw. can do.

  Further, here, a step 78 is provided on the inner periphery of the hole 73, and a spring 77 is interposed between the step 78 and the head 72B at the end of the lock pin 72, and a step 78 which is a predetermined portion. A tapered portion 79 is provided as a changing portion that gradually changes the diameter of the hole 73 toward the bottom.

  In this way, when the lock pin 72 is inserted into the hole 73, the diameter changes to be smaller toward the stepped portion 78 inside the hole 73. It becomes possible to easily insert the lock pin 72 into the hole 73 at the tip of 78.

  Further, in the present embodiment, a notch portion 80 is provided in the fixing portion 71 and the like so as to avoid interference with the component 81 that is the object. That is, even when a part 81 or the like is arranged near the fixing part 71 or the lock pin 72, the fixing part 71 can be fixed to the substrate 74 by the lock pin 72 at a position where the fixing part 71 avoids the part 81 by the notch part 80. can do.

  23 to 25 show a ninth embodiment of the present invention. In each of these drawings, reference numeral 91 denotes a heat receiving plate as a heat receiving portion of a cooling device that receives heat from a heat source 92 such as a CPU. In this embodiment, 91 is provided separately from a mounting plate 95 having a floating portion 94. ing. In addition, 96 is a board | substrate which mounts the heat source 92, The board | substrate 96 containing the said heat source 92 becomes a target object which fixes a cooling device.

  The configuration of the heat receiving plate 91, the floating portion 94, and the mounting plate 95 will be described in more detail. The heat receiving plate 91 is composed of a member having good thermal conductivity, and a contact portion 91A of the heat source 92 and both sides from the contact portion 91A. And a tongue piece 91 </ b> B extending in the direction. On the other hand, the frame-shaped mounting plate 95 is provided with holes (not shown) through which the screws 97 of the floating portion 94 are inserted at the four corners, and the tongue pieces 91B of the heat receiving plate 91 abut against the mounting plate 95. That is, here, the mounting plate 95 surrounded by a frame is placed on the heat receiving plate 91, but a material that is less deformable than the heat receiving plate 91 is selected for the mounting plate 95.

  The floating portion 94 has a flange-shaped head portion 97B at the base end of the shaft portion 97A, a screw 97 having a male screw portion 97C at the tip, and a portion between the head portion 97B of the screw 97 and one side surface of the mounting plate 95. A coil spring 98 as an elastic body that urges the mounting plate 95 toward the substrate 96 with the heat source 92 and a shaft portion 97A of the screw 97, and the mounting plate 95 falls off the screw 97. It consists of a stopper 99 such as an E-ring to prevent. In this embodiment, the floating portion 94 is not attached to the heat receiving plate 91, and the load by the coil spring 98 does not directly act on the heat receiving plate 91.

  In the above configuration, when fixing the heat receiving plate 91 to the substrate 96 with the heat source 92, a through-hole provided at an appropriate position of the substrate 96 with the heat receiving plate 91 interposed between the mounting plate 95 and the heat source 92. The male screw portion 97C of the screw 97 is inserted into the 96A from one side of the substrate 96, and a fastening member such as a nut is screwed to the tip portion of the male screw portion 97C protruding from the other side of the substrate 96. As a result, the substrate 96 is sandwiched and fixed between the bottom surface of the shaft portion 97A of the screw 97 and the nut. At this time, since the heat receiving plate 91 contacts the heat source 92 on the surface side of the substrate 96, the mounting plate 95 is lifted from the stopper 99 against the bias of the coil spring 98, but the elastic force of the coil spring 98 is Since it acts on the plate 95 and does not reach the heat receiving plate 91 directly, deformation of the heat receiving plate 91 can be suppressed. Therefore, the thermal resistance between the heat receiving plate 91 and the heat source 92 is reduced, and the heat conduction performance from the heat source 92 to the heat receiving plate 91 is not deteriorated.

  As described above, in this embodiment, the screw 97 as the fixing member fixed to the substrate 96 with the heat source 92 as the object, the coil spring 98 as the elastic body attached to the screw 97, and the coil spring 98 are used. A mounting plate 95 that is a mounting portion that is biased toward the substrate 96 with the heat source 92, and a heat receiving plate 91 that is provided separately from the mounting plate 95 and that is in contact with the substrate 96 with the heat source 92. ing.

  In this way, the heat receiving plate 91 that contacts the substrate 96 with the heat source 92 and the mounting plate 95 that is biased toward the substrate 96 with the heat source 92 by the coil spring 98 are configured as separate members. Although this urging force acts on the mounting plate 95, it does not directly reach the heat receiving plate 91, and deformation of the heat receiving plate 91 can be suppressed.

  FIG. 26 shows a tenth embodiment of the present invention. In addition, since this embodiment has many common parts with the ninth embodiment, the same portions will be described with the same reference numerals.

  In the present embodiment, it is noted that a cylindrical stopper 101 that contacts the surface of the substrate 96 is provided so as to be movable in the axial direction of the screw 97 instead of the ring-shaped fixed stopper 99 shown in FIG. . The screw 97 as an insert has a second shaft portion 97D slightly smaller in diameter than the first shaft portion 97A between the first shaft portion 97A and the male screw portion 97C, and the stopper 101 has moved. Can be brought into contact with the bottom surface of the first shaft portion 97A.

  The stopper 101 includes a first hole 101A that can be inserted into the second shaft portion 97D and a second hole 101B having a diameter larger than the first hole 101A and the through hole 96A formed in the substrate 96. The bottom surface 101C of the stopper 101 is placed in contact with the surface (upper surface) of the substrate 96. In addition, a bulging portion 97E having a diameter larger than that of the first hole 101A is provided below the second shaft portion 97D in order to prevent a stopper 101 and a heat receiving plate 103 described later from dropping from the screw 97. It is formed. As a result, the stopper 101 can move between the bulging portion 97E for retaining and the bottom surface of the first shaft portion 97A. As a modification, the stopper 101 may be fixed to the screw 97.

  Reference numeral 102 denotes a wing nut that is screwed into a male screw portion 97 </ b> C protruding to the back side of the substrate 96. Note that another fastening member other than the wing nut 102 may be used. In this embodiment, the heat receiving plate 103 that contacts the heat source 92 is directly urged by the coil spring 98 to the substrate 96 with the heat source 92. However, the heat receiving plate 91 and the mounting plate 95 as in the ninth embodiment You may employ | adopt the structure which isolate | separated as a heat receiving body.

  Next, the operation of the above configuration will be described. When the heat receiving plate 91 is fixed to the substrate 96 with the heat source 92, the screw 97 is inserted into the through hole 96A provided at an appropriate position of the substrate 96 from one side of the substrate 96. The male screw portion 97C is inserted, and the wing nut 102 is screwed to the tip portion of the male screw portion 97C protruding from the other side of the substrate 96. As the male screw portion 97C of the screw 97 is screwed into the wing nut 102, the substrate 96 approaches the heat receiving plate 103 side together with the heat source 92, and when the upper surface (heat receiving surface) of the heat source 92 eventually comes into contact with the lower surface of the heat receiving plate 103, the coil spring 98 The substrate with the heat source 92 and the heat receiving plate 103 are pushed up against the urging of.

  Here, in the case of a conventional stopper such as an E ring, the screw 96 can be screwed in until the coil spring 98 is completely crushed. In this embodiment, when both ends of the cylindrical stopper 101 come into contact with the bottom surface of the first shaft portion 97A of the screw 97 and the surface of the substrate 96, the movement of the heat source 92 and the substrate 96 toward the heat receiving plate 103 is restricted. As a result, the screw 97 cannot be tightened any further. Therefore, if the dimensions of the stopper 101 are defined in advance so that the screw 97 cannot be tightened before the coil spring 98 is completely crushed, excessive tightening of the screw 97 can be reliably prevented.

  As described above, in this embodiment, the screw 97 as a fixing member fixed to the substrate 96 with the heat source 92 that is the object and the heat source 92 can come into contact with each other. A heat receiving plate 103 as a heat receiving portion that can be inserted into the second shaft portion 97D, a coil spring 98 as an elastic body that urges the heat receiving plate 103 toward the substrate 96 with the heat source 92, and the first of the substrate 96 and the screw 97. In order to restrict the movement of the substrate 96 to the heat receiving plate 103 side, and to prevent the screw 97 from coming out of the heat receiving plate 103, it is interposed between the bottom surface of one shaft portion 97A. And a stopper 101 in contact with the portion 97E.

  In this way, when the screw 97 is fixed to the substrate 96 with the heat source 92 by, for example, screwing, if the stopper 101 abuts against the substrate 96, the screw 97 is further resisted against the bias of the coil spring 98. Cannot move to the 103 side. Therefore, if the dimensions of the stopper 101 are determined in advance so that the stopper 101 abuts against the substrate 96 before the heat receiving plate 103 crushes the coil spring 98, excessive force is not applied to the substrate 96 with the heat source 92. The destruction of the substrate 96 with the heat source 92 is avoided. The stopper 101 is originally provided to prevent the screw 97 from coming off from the heat receiving plate 103, so that the number of parts does not increase at all as compared with the conventional one.

  In this embodiment, the substrate 96 may be fixed to the heat receiving plate 103 by another fixing means other than the screw 97 and the wing nut 102.

  27 to 29 show a tenth embodiment of the present invention. First, the configuration of the cooling device 110 will be described with reference to FIGS. 27 and 28. The cooling device 110 is formed on one side of the heat sink 111 by, for example, die-casting a material having good thermal conductivity. An outer shell is formed by a plate-like cover 113 that closes the upper surface of the recessed portion 112. The recess 112 accommodates a blower unit 116 having a rotatable fan 115. The heat sink 111 and the cover 113 are formed with intake holes 117 and 118, respectively, facing the rotation axis direction of the fan 115. Further, an exhaust hole (not shown) is formed in the side surface of the recess 112 orthogonal to the intake holes 117 and 118.

  Reference numeral 121 denotes a heat receiving portion corresponding to a heat receiving body integrally formed on the other side of the heat sink 111. A concave receiving portion 122 is formed on the lower surface side of the heat receiving portion 121, and a heat source 123 such as a CPU attached to a personal computer housing (not shown) is disposed on the receiving portion 122. Note that the heat receiving part 121 may be provided separately from the heat sink 111, and the heat sink 111 and the heat receiving part 121 may be connected by a heat pipe (not shown) as heat transfer means.

  131 are floating portions respectively disposed at, for example, four corners of the heat receiving portion 121. The floating portion 131 includes a male thread portion 132 protruding from the lower surface of the heat receiving portion 121 and a cylindrical body 134 with a flange 133 attached to the heat receiving portion 121. And formed. The male threaded portion 132 is for screwing the wing nut 102 as in the tenth embodiment, for example, so that the cooling device 110 can be attached to the personal computer housing as an object. A structure may be applied.

  Reference numeral 135 denotes a leaf spring as a plate-like elastic body disposed on the upper side of the heat receiving portion 121. As shown in FIG. 29, the leaf spring 135 forms a central portion 136 corresponding to a location where the heat source 123 of the heat receiving portion 121 is connected, and an arm portion 137 extending in four directions from the periphery of the central portion 136. Thus, a hole 138 into which the cylindrical body 134 of the floating part 131 can be inserted is formed at the tip of each arm part 137. In the present embodiment, a plurality of (three to five) convex portions 139 are arranged substantially evenly with respect to the center of the heat source 123 on the side of the central portion 136 facing the heat receiving portion 121. As shown by a dotted line in FIG. 27, the leaf spring 135 is curved in a convex shape on the side where the convex portion 139 of the central portion 136 is provided.

  Next, the operation of the above-described configuration will be described. The cooling device 110 of the present embodiment is fixed to an object such as a personal computer housing by a male screw portion 132 of the floating portion 131, and is also mounted on a printed circuit board or the like. 123 is arranged in a receiving part 122 formed on the lower surface side of the heat receiving part 121. In this state, the cylindrical body 134 of the floating portion 131 is inserted in the hole 138 around the leaf spring 135 in advance, and the arm portion 137 in contact with the flange 133 at the upper end of the floating portion 131 is the heat receiving portion. It is elastically deformed with a central part 136 facing 121 as a fulcrum. At this time, since the central portion 136 of the leaf spring 135 has a plurality of convex portions 139 protruding toward the heat receiving portion 121, a load is evenly applied to the portion of the heat receiving portion 121 where the heat source 123 contacts. Therefore, the heat source 123 is less likely to tilt with respect to the heat receiving unit 121, and the adhesion between the two is improved.

  As described above, in the present embodiment, in the cooling device 110 including the heat receiving portion 121 as the heat receiving portion to which the heat source 123 is connected and the plate spring 135 that is a plate-like elastic body that biases the heat receiving portion 121 to the heat source 123, The leaf spring 135 is provided with a plurality of convex portions 139 that come into contact with the heat receiving portion 121.

  In this way, each convex part 139 provided on the leaf spring 135 applies a load evenly to the heat receiving part 121, so that the heat receiving part 121 is less likely to tilt with respect to the heat source 123, and the heat source 123 and the heat receiving part Adhesion with 121 can be improved.

  30 and 31 show a twelfth embodiment of the present invention. This embodiment, like the seventh embodiment, relates to the mounting structure of the case 141 and the cover 142 that form the outline of the cooling device. The case 141 and the cover 142 are made of resin or metal. There may be. Reference numerals 143 and 144 denote air intake holes formed in the case 141 and the cover 142, respectively. The air tunnel surrounded by the case 141 and the cover 142 is opposed to the air intake holes 143 and 144. A blower is provided. Further, in this embodiment, an exhaust hole 145 opened on one side of the cooling device is formed.

  A case 141 corresponding to a casing is formed by a bottom portion 151 in which the intake hole 144 is formed, and a peripheral wall 152 that rises perpendicularly from an edge of the bottom portion 151. A plurality of recesses 153 are provided. A plurality of convex claws 155 are integrally provided on the side surface of the cover 142 so as to correspond to the concave portions 153. Further, in order to prevent the claw 155 engaged with the concave portion 153 from easily coming out, raised portions 157 that can be elastically deformed are provided on both sides of the upper portion of the concave portion 153 at intervals slightly narrower than the width of the concave portion 153 and thus the claw 155. . The upper end of the raised portion 157 is formed to have the same height as the upper end of the peripheral wall 152, or slightly higher as shown in FIG.

  In this embodiment, when the cover 142 is attached to the case 141, the claw 155 of the cover 142 is placed between the raised portions 157 and 157 facing the case 141, and the direction of the arrow M shown in FIG. From the direction, each claw 155 is pushed toward the recess 153 against the elasticity of the raised portions 157 and 157. If the cover 142 is pushed in until the claw 155 gets over the raised portions 157 and 157 and hits the recessed portion 153, the raised portions 157 and 157 are elastically restored so that the claw 155 cannot come out, and the cover 142 is fixed to the case 141. Figured.

  In the state where the cover 142 is incorporated in the case 141, the tip of the claw 155 does not protrude from the outer surface of the peripheral wall 152, and the upper end of the raised portion 157 which is the uppermost surface of the cooling device is almost the same height as the upper end of the peripheral wall 152. Therefore, the external shape of the cooling device can be made compact. In addition, since it is only an operation to push the cover 142 into the case 141, there is no need for processing to be bent later, processing equipment is reduced, vibration is not given like welding, and variation does not occur. The cover 142 can be securely attached to the case 141. This can be realized by the claw 155 extending on the side surface of the cover 142 in the present embodiment and the recessed portion 153 with the raised portions 157 and 157 formed in the case 141.

  32 to 34 show a thirteenth embodiment of the present invention. FIG. 32 illustrates a wind speed (wind speed) from a blower 170 of a general turbofan. 172 is a fan provided in the blower 170, and 173 is a peripheral wall of a case 174 surrounding the outer periphery of the fan 172. When the fan 172 is rotated in the direction of the arrow R, the wind is discharged from the exhaust port 175 on one side of the case 174. The wind speed Fs from the exhaust port 175 is larger on the one side 175A from which more wind is discharged along the outer circumferential tangent direction of the fan 172 than on the other side 175B. That is, the wind speed Fs from the exhaust port 175 is not uniform, and varies depending on the amount of wind exhausted from the direction of the outer peripheral tangent of the fan 172.

  Conventionally, each fin piece of the heat dissipating fin disposed in the exhaust port 175 has the same length, regardless of the arrangement position, as described in, for example, Patent Document 1 and Japanese Patent Application Laid-Open No. 2001-44348. The fin pitch through which the air passes was also the same. However, this makes the wind contact area per unit area of the radiating fin constant regardless of the wind speed characteristics of the cooling device, so that sufficient cooling performance cannot be exhibited.

  FIG. 33 shows an example of a cooling device that copes with such a problem. In FIG. 33, a heat radiating fin 182 in which a plurality of fin pieces 181 are arranged in parallel is arranged at the exhaust port 175. The length of each fin piece 181 is gradually increased from the other side 175B of the small exhaust port 175 toward the one side 175A of the exhaust port 175 having a high wind speed Fs. That is, the length of the fin piece 181 is adjusted in proportion to the wind speed Fs from the exhaust port 175, and the wind contact area per unit area in the radiating fin 182 as the radiating portion is changed according to the arrangement site. Yes.

  In such a configuration, since the area of the radiating fin 182 that comes into contact with the wind increases around one side 175A where the wind speed Fs of the exhaust port 175 is large, the heat exchange performance with the air (wind) is constant. Therefore, the cooling fin can contribute to the improvement of the cooling performance. In addition, since each fin piece 181 is arranged so that the distance from the outer periphery of the fan 172 to the entrance surface of the radiating fin 182 is substantially constant from one side 175A to the other side 175B of the radiating fin 182, the radiating fin An increase in local noise at the entrance surface of 182 can be suppressed.

  As another modification, as shown in FIG. 34, one side 175A of the exhaust port 175 having a high wind speed Fs is changed from the other side 175B of the exhaust port 175 having a low wind speed Fs in accordance with the distribution of the wind speed Fs at the exhaust port 175. In addition to changing the length of each fin piece 181, the fin pitch through which air passes may be gradually narrowed. That is, the fin pitch between the fin pieces 181 is adjusted in inverse proportion to the wind speed Fs from the exhaust port 175, and the wind contact area per unit area in the radiating fin 182 as the radiating portion varies depending on the arrangement site. I am letting.

  In this way, by adjusting both the length of the fin piece 181 and the fin pitch, the heat exchange performance of the radiating fin 182 can be further improved. 34, the length of each fin piece 181 may be constant, and only the fin pitch between the fin pieces 181 may be changed according to the arrangement position. Also in this case, the fin pitch between the fin pieces 181 may be adjusted as appropriate so that the area of the heat radiation fin 182 in contact with the wind increases around one side 175A where the wind speed Fs of the exhaust port 175 is large.

  35 to 37 show a fourteenth embodiment of the present invention. In this figure, 191 is a heat sink made of a material having good thermal conductivity, 192 is a cover that covers the back side (lower side) of the heat sink 191 to which the blower 193 is attached, and also in this embodiment, the axial direction of the blower 193 Air is sucked from the intake holes 194 and 195 on both sides, and air is sent out from the exhaust port 196 in the direction orthogonal to the intake holes 194 and 195. Reference numeral 197 denotes a heat radiating fin formed by arranging a plurality of fin pieces 198 arranged in the exhaust port 196.

  Reference numeral 201 denotes a substantially flat mounting portion integrally formed with the heat sink 191. A heat receiving plate 203, which is a plate-shaped heat receiving portion, is engaged with a window hole 202 formed in the approximate center of the mounting portion 201. A heat source such as a CPU (not shown) is tightly connected to the back side of the heat receiving plate 203, while one end portion 205A of a heat pipe 205, for example, heat transfer means is attached to the front side (upper side) of the heat receiving plate 203 by welding or the like. Connected thermally and mechanically. The other end 205B of the heat pipe 205 is disposed along the longitudinal direction of the heat radiating fin 197, and is thermally and mechanically connected to the heat radiating fin 197 by, for example, welding.

  The attachment portion 201 is formed with a piece, that is, a contact piece 206, with which the front side surface of the heat receiving plate 203 disposed in the window hole 202 can partially abut. In addition, on the front side surface of the attachment portion 201, contact portions 208 and 209 that can contact the proximal end and the distal end of the one end portion 205A of the heat pipe 205 are formed. The connection body 211 connecting the heat receiving plate 203 and the heat pipe 205 and the mounting portion 201 which is a part of the heat sink 191 are not mechanically connected, but the mounting is achieved by forming the abutting piece 206. The back side surface of the portion 201 can come into contact with the heat receiving plate 203, and the contact portions 208 and 209 are formed so that the front side surface of the mounting portion 201 can come into contact with the heat pipe 205. Since the connecting body 211 connecting the heat receiving plate 203 and the heat pipe 205 sandwiches both sides of the mounting portion 201, the connecting body 211 is prevented from being detached from the heat sink 191. When the heat receiving plate 203 comes into contact with the abutting piece 206, a gap is formed between the heat pipe 205 and the contact portions 208 and 209, and conversely, the heat pipe 205 comes into contact with the contact portions 208 and 209. In this case, a gap is formed between the abutting piece 206 and the heat receiving plate 203. That is, as shown by an arrow B in FIG. 37, in consideration of the adhesion between the heat receiving plate 203 and the heat source, the coupling body 211 can move to some extent in the vertical direction of the mounting portion 201.

  In this embodiment, the heat receiving plate 203 as the heat receiving portion is provided only at one place, but there may be a plurality of heat receiving portions. A plurality of heat pipes 205 may be used.

  In this embodiment, when the cooling device is assembled, the heat receiving plate 203 is engaged with the window hole 202 of the mounting portion 201 formed integrally with the heat sink 191, and one end portion 205 </ b> A of the heat pipe 205 is disposed above the heat receiving plate 203. Put on. Here, the abutting piece 206 and the abutting portion 209 are each formed with a pair of wall portions 213 and 214 for positioning the heat pipe 205 so as to rise on the surface side of the attaching portion 201. The heat pipe 205 is naturally arranged at the contact portions 208 and 209 of the 201 so that the proximal end and the distal end of the one end portion 205A are located. In this state, when one end portion 205A of the heat pipe 205 and the heat receiving plate 203 are joined together by welding or the like, for example, a connecting body 211 composed of the heat pipe 205 and the heat receiving plate 203 is formed, and the connecting body 211 is attached. The both sides of the part 201 are clamped.

  As described above, in this embodiment, the heat pipe 205, which is a heat transfer means, and the connection body 211 formed by fixing the heat receiving plate 203, which is a heat reception part, and the attachment part of the heat sink 191 sandwiched by the connection body 211 A cooling device composed of 201 is proposed. In this case, there is no mechanical connection between the heat receiving plate 203 and the heat sink 191, and mechanical fixation is achieved only between the heat pipe 205 and the heat receiving plate 203, and the heat receiving plate 203 is slightly spaced from the heat sink 205. Therefore, the ability to follow the heat source of the heat receiving plate 203 is improved.

  That is, if the heat receiving plate is fixed to the heat sink as in the conventional case, the heat receiving plate cannot be separated from the heat sink and moved when there is a slight gap between the heat receiving plate and the heat source. However, in this embodiment, since the heat receiving plate 203 can be moved separately from the mounting portion 201 of the heat sink 191, deterioration of the cooling performance as a cooling device can be easily avoided.

  38 to 41 show a fifteenth embodiment of the present invention. In this figure, reference numeral 231 denotes a heat sink made of a material having good thermal conductivity, and 232 denotes a cover that partially covers the heat sink 231 to which the air blowing part 233 is attached. Air is sucked from the intake holes 234 and 235, and air is sent out from the exhaust port 236 in a direction orthogonal to the intake holes 234 and 235. Reference numeral 31 denotes a heat radiating fin having the same structure as that of the sixth embodiment provided to face the exhaust port 236, and is mounted and fixed on a heat receiving plate 240 forming a part of the heat sink 231 here. In this embodiment, the heat from the heat source 241 connected to the lower surface of the heat receiving plate 240 is quickly transferred from the heat receiving plate 240 to the heat radiating fin 31, and the wind sent from the exhaust port 236 there is the duct of the heat radiating fin 31. By passing through 34, the heat reaching the heat radiating fins 31 is efficiently taken away.

  In the present embodiment, the heat receiving plate 240 including the heat sink 231, the heat radiation fins 31 as the heat radiator, and the cover 232 are all formed of a plastic processed product having a thickness t of 1.0 mm or less. As described above, if the heat sink 231 and the cover 232 that form the outline of the cooling device and the heat receiving plate 240 as the heat receiving portion are all plastic processed products having a thickness t of 1.0 mm or less, a thin and lightweight cooling is possible. While being able to set it as an apparatus, even if it is the same external dimension, the ventilation part 233 can be enlarged more and high air volume can be achieved. Furthermore, it is possible to provide a low-cost blower with less capital investment than die casting.

  As a modification, in addition to the above-described configuration, as shown in FIG. 41, a heat pipe 251 serving as a heat transport means for guiding the heat reaching the heat receiving plate 240 to the periphery of the blower 233 is disposed along the heat sink 231. May be.

  In addition, this invention is not limited to said each Example, A various deformation | transformation implementation is possible. For example, it is good also as a structure which combined the characteristic shown in each Example.

It is a top view of the state which removed the cover of the cooling device in 1st Example of this invention. It is a top view of the state which removed the cover of the cooling device in 2nd Example of this invention. It is a top view of the state which removed the cover of the cooling device in 3rd Example of this invention. It is a graph which shows the characteristic of flow volume-wind pressure when changing the number of fin materials of each radiation fin same as the above. It is a graph which shows the characteristic of fan speed-noise level when changing the number of fin materials of each radiation fin. It is a top view of the state which removed the cover of the cooling device in 4th Example of this invention. It is a principal part perspective view of the cooling device in 5th Example of this invention. It is a principal part perspective view of the cooling device which shows the modification using a heat pipe same as the above. It is a whole perspective view of the radiation fin in the 6th example of the present invention. It is a top view of the cooling device incorporating the radiation fin of FIG. 9 same as the above. It is a front view of the cooling device incorporating the radiation fin of FIG. FIG. 10 is a left side view of the cooling device incorporating the heat dissipating fins of FIG. It is a principal part perspective view after welding of the cooling device in 7th Example of this invention. It is a top view of a cover simple substance same as the above. The boss | hub after performing ultrasonic welding same as the above, the principal part top view of the periphery, and the II sectional view taken on the line. It is a principal part top view which shows the various modifications of a receiving part same as the above. It is a partially notched sectional view of the cooling device in the eighth embodiment of the present invention. It is a sectional view of a fixed part same as the above. It is the II sectional view taken on the line of FIG. It is a top view of the board | substrate only which is a fixed object same as the above. It is a top view of the state which attached the cooling device on the board | substrate same as the above. It is a front view of the state which attached the cooling device on the board | substrate same as the above. It is a top view of the heat receiving plate and its periphery in 9th Example of this invention. It is a side view of a heat-receiving board and its periphery same as the above. It is the II sectional view taken on the line of FIG. It is sectional drawing of the principal part in 10th Example of this invention. It is a fragmentary sectional view of the cooling device in 11th Example of this invention. It is a partial top view of a cooling device same as the above. It is a top view of a leaf | plate spring same as the above. It is a principal part disassembled perspective view of the cooling device in 12th Example of this invention. FIG. 31 is a view taken in the direction of arrow A in FIG. 30. It is explanatory drawing which showed the wind speed characteristic of the turbo fan as a cooling device in 13th Example of this invention. It is explanatory drawing of the improved cooling device same as the above. It is explanatory drawing of another improved cooling device same as the above. It is a top view of the cooling device in 14th Example of this invention. It is a principal part perspective view same as the above. It is the II sectional view taken on the line of FIG. It is a top view of the cooling device in 15th Example of this invention. It is a top view of the cooling device in 15th Example of this invention which is the II line sectional drawing of FIG. 38 same as the above. It is a side view of a cooling device same as the above. It is a rear view of the cooling device which shows another modification same as the above. It is a top view of the state which removed the cover of the cooling device in a prior art example. It is a perspective view of the radiation fin formed by bending the thin plate simple substance in a prior art example. It is a perspective view of the radiation fin which laminated | stacked multiple metal plate materials in a prior art example. It is a disassembled perspective view showing the outline of the cooling device in a conventional example. It is the principal part top view of the boss | hub before and behind performing the ultrasonic welding in a prior art example, and its periphery. It is a top view of the heat receiving plate and floating part in a prior art example. It is the II sectional view taken on the line of FIG. It is a fragmentary sectional view of another cooling device in a conventional example.

Explanation of symbols

3 Ventilation part 8, 9, 19 Exhaust port (exhaust part)
13, 14 Radiating fins (heat sink)
16A, 16C Fin part (heat radiation part)
18 Convex (wall)
21 Air blower
22 Radiation fin (heat sink)
26 Inclined part (wind direction part)
29 Heat receiving plate (heat receiving part)
30 Heat pipe (transmission means)
34 Duct
35 flat surface
45 Case
46 Cover
48 Boss (projection)
49 holes
51 Receiver
52 Engagement part
64 Substrate (object)
71 Fixed part
72 Lock pin (pin)
72C Isobe
73 holes
77 Spring (elastic body)
78 steps
79 Tapered part (change part)
80 Notch
81 Parts (objects)
91 Heat receiving plate (heat receiving part)
92 Heat source (object)
95 Mounting plate (Mounting part)
96 Substrate (object)
97 Screw (fixing member)
98 Coil spring (elastic body)
101 Stopper
103 Heat receiving plate (heat receiving part)
121 Heat receiver
123 heat source
135 leaf spring (plate-like elastic body)
139 Convex

Claims (15)

In the cooling device provided with the air blowing part provided with the exhaust part, and the radiator is arranged,
A cooling device, wherein at least one of the heat dissipating bodies is formed in two or more lengths, and a heat dissipating part having the same length is provided in one heat dissipating body and another heat dissipating body. The cooling device according to claim 1, wherein the radiator disposed in the exhaust portion is formed with two or more types of lengths. The cooling device according to claim 1 or 2, wherein the pitch is changed for each of the radiators. The cooling device according to any one of claims 1 to 3, further comprising a wall portion for directing air in a flow path direction of the radiator. The cooling device according to any one of claims 1 to 4, further comprising an exhaust part in which the heat radiating body is not present at all or partly. The cooling device provided with the heat receiving part which contact | connects a heat source, the ventilation part, and the thermal radiation part in the ventilation direction of the said ventilation part WHEREIN: The cooling device characterized by forming the air direction part which changes a ventilation direction. The cooling device according to claim 6, wherein the heat receiving portion and the heat radiating portion are connected by a transmission means. A heat radiator formed of a plate-like body, wherein a duct having a triangular cross-section is formed by folding, and flat portions are formed on upper and lower portions. In the cooling device for mounting a plurality of members by a plurality of protrusions and the respective hole portions inserted into these protrusions, receiving portions facing in different directions in which the protrusions can be engaged are provided in the respective hole portions. A cooling device characterized by. A fixing part having a hole; a resin-made pin that can be inserted into the hole; and a pin made of resin, and biasing the pin in a direction of coming out of the hole, and between the fixing part and the hook And an elastic body for sandwiching the object. A step portion is provided in the hole portion, and the elastic body is interposed between the step portion and the end portion of the pin, and a change portion that changes the diameter of the hole portion toward a predetermined portion is provided. The cooling device according to claim 10. The cooling device according to claim 10, wherein a notch is provided to avoid interference with the object. A fixing member fixed to an object, an elastic body attached to the fixing member, an attachment portion urged by the elastic body, and a heat receiving member that is provided separately from the attachment portion and contacts the object And a cooling device. A fixing member fixed to the object, a heat receiving part that contacts the object and is inserted through the fixing member, an elastic body that urges the heat receiving part, and an object interposed between the object and the fixing member And a stopper for preventing the fixing member from slipping out of the heat receiving portion. In the cooling device provided with the heat receiving part which connects a heat source, and a plate-shaped elastic body, the convex part was provided in the said plate-shaped elastic body, The cooling device characterized by the above-mentioned.

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