JP2005057092A - Heatsink fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent the contact of a fitting member 26 with an axial flow fan 22, to increase the air quantity of the axial flow fan 22, to improve the heat radiation effect of a heatsink, and to reduce also the generation of noise due to the increase of the air quantity. <P>SOLUTION: In the heatsink fan constituted of the heatsink 2 to be mounted on an electronic component to be heated and a fan housing 4 provided with the axial flow fan 22 for actively cooling the heatsink 2 by blowing air, the movement of the fitting member 26 for fixedly holding the heatsink fan on the electronic component to the side of the axial flow fan 22 is regulated by supports 16-16c for supporting the axial flow fan 22. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat sink fan for cooling an electronic component such as an MPU.

  A heat sink fan mounted on an electronic component that generates heat, such as an MPU (Micro Processing Unit), is generally attached to a heat sink provided with a plurality of heat radiation fins mounted on the electronic component, and is attached to the heat sink. The fan housing includes an axial fan that actively cools by blowing air. A circular hole is formed in the center of the upper wall portion of the fan housing of such a heat sink fan, and a column portion for holding an axial fan formed in the circular hole is provided around the outer edge of the circular hole. It is provided at equal intervals in the direction. The heat sink fan is, for example, screwed or elastically engaged with a mounting member made of a resin or a thin plate metal material that is mounted so as to be opposed to and adjoin a circular hole provided in the upper wall portion of the fan housing. Then, the heat sink fan is tightened and fixed onto the electronic component (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2003-17640 (FIGS. 3 and 6)

  By the way, in recent years, the speed of calculation processing of the MPU has increased more and more, and the MPU itself has become smaller and highly integrated, and accordingly, the amount of heat generated by the MPU has also increased. For this reason, even for a heat sink fan that cools the MPU, a larger amount of wind is actively blown to the heat sink than ever before to increase the heat dissipation effect. In response to such demands, in the heat sink fan, the axial fan is rotated at a high speed, and the axial fan is disposed so as to protrude on the opposite side of the heat sink from the upper wall portion of the fan housing. It is necessary to improve the heat dissipation effect by increasing the heat radiation area of the fan and by allowing as much air as possible to be sucked in by the axial fan so that more air can be supplied from the axial fan to the heat sink. is there.

  However, when the axial fan is rotated at a high speed, the amount of air supplied to the heat sink can be increased. On the other hand, the generation of noise becomes a problem with the high speed rotation. In particular, when the axial fan is arranged so as to protrude from the fan housing as described above, the inflow resistance when the axial fan takes in air increases as the number of structures such as support portions around the axial fan increases. Increase the air intake volume and limit the amount of air sucked in. Also, since the generation of noise due to turbulence becomes more noticeable when the axial fan rotates, avoid placing structures around the axial fan as much as possible. Is desirable. However, when using a method of fixing the heat sink fan on an electronic component such as an MPU with a mounting member as in the conventional heat sink fan described above, for example, when the mounting member is mounted, it is mounted by pressing force or biasing force. The member may slide on the fan housing. In particular, when the mounting member is provided adjacent to the axial fan, the mounting member moves and contacts the axial fan. The fan housing is designed to avoid contact with the axial fan even when the mounting member moves, because the fan may stop rotating or the axial fan may be damaged. There is a need to. Therefore, in the heat sink fan, the heat dissipation effect of the heat sink is increased by increasing the air volume supplied from the axial fan to the heat sink, and the generation of noise due to the increase in the air volume of the axial fan and high speed rotation is reduced. It is necessary to simultaneously solve the conflicting problems.

  The present invention has been made in view of the above problems, and an object thereof is to solve the following technical problems in a heat sink fan.

(1) To reliably prevent contact between the mounting member and the axial fan.

(2) To increase the air volume of the axial fan and improve the heat dissipation effect of the heat sink.

(3) To reduce the generation of noise associated with an increase in the air volume of the axial fan and high-speed rotation.

In order to solve the above-mentioned problem, a heat sink fan according to claim 1 of the present invention includes a base having one surface attached to a component to be cooled, such as an electronic component, and a plurality of heat dissipation provided on the other surface of the base. A heat sink having fins, an upper wall portion located at the top of the heat radiating fin, a circular hole formed in the center of the upper wall portion, and a heat sink from the upper wall portion located at the outer peripheral portion of the circular hole. A plurality of support portions each consisting of a support column standing on the opposite side and an extending portion extending from the support column into the circular hole, and supported by the plurality of support portions so as to be positioned in the circular hole. A fan housing having an axial flow fan for supplying a cooling air flow to the heat sink, and is fixedly held to the component to be cooled by at least one mounting member disposed adjacent to the axial flow fan. Heat sink A § down,
The attachment member is characterized in that movement to the axial fan side is restricted by at least one of the plurality of support portions.

  In the heat sink fan according to claim 2 of the present invention, the fan housing is provided with at least one protrusion for restricting movement of the attachment member in cooperation with a support portion for restricting movement of the attachment member to the axial fan side. It is characterized by being.

  In the heat sink fan according to claim 3 of the present invention, one of the support portions is provided with a guide portion of a coil lead wire for supplying a driving current to the axial fan, and the axial fan of the mounting member The movement to the side is restricted by a support part other than the support part provided with the guide part.

  In the heat sink fan according to claim 4 of the present invention, a pair of mounting members are provided so as to face each other via the axial fan, and a support portion for restricting the movement of the mounting member to the axial fan side corresponds to this. And a pair of support members for restricting the movement of the pair of attachment members toward the axial fan are disposed diagonally with respect to the rotational axis of the axial fan. To do.

  In the heat sink fan according to claim 1 of the present invention, an attachment member for holding the heat sink fan fixedly to the component to be cooled by at least one of the plurality of support portions for supporting the axial fan. Since movement to the axial fan side is restricted, the structure provided on the outer periphery of the axial fan is kept to a minimum, the inflow resistance of air is reduced, and a large amount of wind is supplied to the heat sink by the axial fan. As a result, it is possible to improve the heat dissipation effect of the heat sink and to suppress the generation of turbulent flow due to the rotation of the axial fan, thereby suppressing the generation of noise due to turbulent flow. . In addition, the support portion can prevent the attachment member from moving toward the axial fan, and the contact between the axial fan and the attachment member can be prevented.

  In the heat sink fan according to claim 2 of the present invention, by providing the protrusion, the structure around the circular hole is somewhat increased, but the mounting member can be reliably prevented from moving toward the axial fan.

  In the heat sink fan according to claim 3 of the present invention, the movement of the mounting member to the axial fan side is restricted by a support portion other than the support portion provided with the guide portion of the coil lead wire that supplies the drive current to the axial fan. Therefore, it is possible to freely arrange the support portion on which the guide portion of the coil lead wire is provided according to the position of the external power source, etc., and the degree of freedom of design is increased to cope with cooling of various types of cooled parts. be able to.

  In the heat sink fan of claim 4 of the present invention, the heat sink fan can be more stably fixed to the component to be cooled by using the pair of mounting members, and the arrangement of the structure around the circular hole is an axial fan. It becomes close to point symmetry with respect to the rotation axis, and it is possible to more effectively suppress the generation of air inflow resistance and the generation of turbulent flow.

  Hereinafter, the heat sink fan of each embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  The heat sink fan shown in FIG. 1 basically includes a heat sink 2 and a fan housing 4 that is detachably attached to the heat sink 2.

  The heat sink 2 is a member formed by extruding a material having a relatively high thermal conductivity such as aluminum, for example, and a base 6 on which one surface is mounted on an electronic component such as an MPU, and the other of the base 6 And a plurality of flat plate-like heat radiation fins 8 formed so as to extend in parallel with each other. Note that the heat sink 2 is not limited to the one formed by extrusion molding as described above, and a metal thin plate is used as a heat sink or a radiation fin in which the base and the radiation fin are separately formed and the radiation fin is fitted and fixed to the base. A heat sink that is bent so as to have a rectangular wave shape with a continuous cross section to form a heat radiating fin is also applicable to the present invention.

  On the other hand, the fan housing 4 has a substantially rectangular upper wall portion 10 and an outermost portion in the width direction W of the upper wall portion 10 (a direction orthogonal to the extending direction of the heat radiation fin 8 in the heat sink fan shown in FIG. 1). And a side wall portion 12 depending from the side wall. A circular hole 14 is formed at the center of the longitudinal direction L of the upper wall portion 10 of the fan housing 4 (a direction parallel to the extending direction of the radiating fins 8 in the heat sink fan shown in FIG. 1). Further, a support member 15 for holding an axial fan 22 described later is formed on the outer peripheral portion.

  The support member 15 includes four support columns 16a to 16d formed on the outer periphery of the circular hole 14, and a plurality of extending portions 18a that are positioned at the upper ends of the support columns 16a to 16d and extend inward from the upper ends. To 18d. Further, the support member 15 is located at the tip of the extending portions 18a to 18d, and has a disk portion 20 formed coaxially with the axial fan 22 and holding the circular hole 14 above the circular hole 14. In this case, the disk portion 20 is provided so as to protrude in a direction opposite to the heat sink 2 from the upper wall portion 10 by the support portions 16a to 16d and the extending portions 18a to 18d, and thus the axial fan 22 is also provided. The whole is disposed so as to be located on the outer side of the upper wall portion 10. In other words, the axial fan 22 is held in a state where the entire outer peripheral portion thereof is exposed from the fan housing 4, and is cooled from the intake port defined between the adjacent column portions 16a to 16d and the extending portions 18a to 18d. Air is sucked and the cooling air is supplied to the heat sink 2 to actively cool the heat sink 2. Since the axial fan 22 can be detachably attached to the disk portion 20, the heat sink fan of the present invention can be used semi-permanently by replacing the axial fan 22.

  On the outer peripheral portion of the circular hole 14 of the fan housing 4, there is a substantially rectangular locking portion 24 · deg; 24b between the support columns 16a and 16b and between the support columns 16c and 16d. 4 is erected integrally with the upper wall portion 10. Further, flat portions 16a1 and 16c1 are provided at the base portion of the support column 16 · deg; 16c arranged adjacent to the locking portions 24 · deg; 24b. The locking portion 24a and the flat portion 16a1 form a plane parallel to the width direction W at substantially the same position in the longitudinal direction L, and the locking portion 24c and the flat portion 16c1 similarly. The planes parallel to the width direction W are formed at substantially the same position in the longitudinal direction L.

  The extending portion 18d is provided with a guide groove 18d1 having an upper opening extending over the entire length of the extending portion 18d, and the axial fan 22 and an external power source (not shown) are electrically connected through the guide groove 18d1. A coil lead wire 25 is guided.

  As the material of the fan housing 4, a material having heat resistance such as engineer plastic, a low thermal expansion coefficient and excellent dimensional stability is preferable. Of these, saturated polyester is preferable from the viewpoint of ease of processing and molding, and polybutadiene terephthalate (PBT) and polyethylene terephthalate (PET) reinforced with glass fiber are particularly preferable. The glass fiber content may be appropriately determined from the required mechanical strength, dimensional stability, etc., but is generally in the range of 10 to 40% by weight, and particularly preferably in the range of 25 to 35% by weight. A method for producing the fan housing 4 using such a material is not particularly limited, and a conventionally known molding method such as injection molding can be used.

  The fan housing 4 is provided on the heat dissipating fin 8 that is located on the outermost side in the width direction W among the heat dissipating fins 8 provided on the heat sink 2, with claw portions (not shown) provided on the lower portion of the side wall portion 12 of the fan housing 4. The heat sink 2 is fixed by engaging with a recessed portion (not shown). Then, the heat sink fan is placed on the MPU that generates heat, and the elastically deformable attachment member 26 indicated by the broken line is attached to the upper wall portion 10 of the fan housing 4, and then the attachment member 26 is tightened to the heat sink 2 side. The heat sink fan is tightly fixed on the MPU. The fan housing 4 and the heat sink 2 can be engaged not only with the above embodiment but also with a conventionally known one. For example, an engagement protrusion is provided at the lower part of the side wall, and an engagement hole is provided on the heat sink. Both may be engageable.

  When the axial flow fan 22 is rotationally driven in a predetermined direction in the heat sink fan, the air sucked from the circular hole 14 of the fan housing 4 is supplied to the heat sink 2 and flows along the radiation fins 8. On the other hand, heat generated by a heating element such as an electronic component is conducted to the plurality of radiating fins 8 through the base 6 of the heat sink 2. And when the supplied air flows along the radiation fin 8, heat moves from the radiation fin 8 to the air. In this way, the heat generated by the electronic component moves from the heat sink 2 to the air flow, and is dissipated to the outside of the heat sink 2 by the air flow.

  In the first embodiment of the present invention, the locking portion 24a provided on the upper wall portion 10 of the fan housing 4 and the flat portion 16a1 of the column portion 16a, and the flat portion 16c1 of the locking portion 24b and the column portion 16c, Even when the mounting member 26 slips when the mounting member 26 is tightened to the heat sink 2 side, the movement to the axial fan 22 side is restricted, so that contact between the mounting member 26 and the axial fan 22 is avoided. Therefore, it is possible to prevent the rotation failure and damage of the axial fan 22 from occurring. Further, since the structures formed on the outer peripheral portion of the circular hole 14 are only the locking portion 24 · deg; y 24c and the column portions 16a to 16d, air inflow resistance and disturbance during rotation of the axial fan 22 Two conflicting problems of improving the cooling effect and reducing the noise are solved at the same time by minimizing the generation of flow. In this case, when it is possible to restrict the movement of the mounting member 26 using only the flat surface portion 16a1 of the support column portion 16a and the flat surface portion 16c1 of the support column portion 16c, the locking portions 24 · deg; 24b can be omitted. is there.

  Further, the column portion 16d integrated with the extending portion 18d provided with the guide groove 18d1 for guiding the coil lead wire 25 is not used for restricting the movement of the mounting member 26. Since it is free, it is possible to select an optimal arrangement in the positional relationship with an external power source (not shown). For this reason, the degree of freedom in design increases and it becomes possible to cope with the cooling of various types of MPUs, so the versatility as a heat sink fan increases.

  FIG. 2 is a perspective view showing another embodiment of the present invention. Since the basic structure of the heat sink fan is the same as the structure shown in FIG.

  The fan housing 54 is formed with a substantially rectangular upper wall part 60 and a side wall part 62 depending from the outermost part in the width direction W of the upper wall part 60. A circular hole 64 is formed at the center of the upper wall portion 60 of the fan housing 54, and a support member 65 for holding an axial flow fan 72 described later is formed at the upper portion and the outer peripheral portion of the circular hole 64.

  The support member 65 is located on the outer peripheral portion of the circular hole 64 in the longitudinal direction L, is formed at regular intervals in the width direction W, and is located at the upper end portions of the support portions 66a to 66d and the support portions 66a to 66d. It has a support portion composed of extending portions 68a and 68b parallel to each other in the longitudinal direction L connecting the supporting column portions 66 · deg; 66d and the supporting column portions 66b and 66c. Further, the support member 65 is positioned between the extending portion 68a and the extending portion 68b in the width direction W, is formed coaxially with the axial fan 72 above the circular hole 64, and holds the disk portion 70. have. Further, the base portions of the column portions 66 b and 66 b and the column portions 66 c and 66 d are formed as surfaces parallel to the width direction W at substantially the same position in the longitudinal direction L.

  In the second embodiment of the present invention, the movement of the mounting member 26 toward the axial fan 72 side is restricted by the column portions 66 a to 66 b arranged on the outer peripheral portion of the circular hole 64 of the upper wall portion 60 of the fan housing 54. Therefore, although there is a restriction on the guide structure of the coil lead wire 75 for electrically connecting the axial fan 72 and an external power source (not shown), it is provided on the outer peripheral portion of the axial fan 22. The number of structures can be further reduced, and the effect of suppressing the inflow resistance and turbulence of air described in the description of the first embodiment becomes more remarkable.

It is a perspective view which shows one Embodiment of this invention. It is a perspective view which shows other embodiment of this invention.

Explanation of symbols

2 Heat sink 4 Fan housing 10 Upper wall portion 14 Circular hole 16a, 16b, 16c, 16d Strut portion 16a1, 16c1 Planar portion 18a, 18b, 18c, 18d Extension portion 22 Axial fan 24a, 24b Locking portion 26 Mounting member

Claims (4)

A heat sink having a base having one surface attached to a component to be cooled such as an electronic component, and a plurality of heat dissipating fins provided on the other surface of the base;
An upper wall portion located above the heat radiating fin, a circular hole formed in the center of the upper wall portion, and an outer peripheral portion of the circular hole that stands on the opposite side of the heat sink from the upper wall portion. A plurality of support portions each including a support portion and an extending portion extending from the support portion into the circular hole, and supported by the plurality of support portions so as to be positioned in the circular hole and cooling the heat sink. And a fan housing having an axial flow fan for supplying an air flow, and a heat sink fixedly held to the cooled component by at least one mounting member disposed adjacent to the axial flow fan A fan,
The heat sink fan is characterized in that movement of the mounting member toward the axial fan is restricted by at least one of the plurality of support portions.   The fan housing is provided with at least one protrusion for restricting movement of the attachment member in cooperation with a support portion for restricting movement of the attachment member toward the axial fan. Item 2. The heat sink fan according to Item 1.   One of the support parts is provided with a guide part of a coil lead wire for supplying a driving current to the axial fan, and the movement of the mounting member toward the axial fan side is performed by the guide part. 3. The heat sink fan according to claim 1, wherein the heat sink fan is regulated by a support portion other than the support portion provided with the heat sink.   A pair of the mounting members are provided so as to face each other via the axial fan, and a pair of support portions for restricting the movement of the mounting member to the axial fan side is also provided, 4. The support portion for restricting the movement of the pair of mounting members toward the axial fan side is disposed diagonally with respect to the rotational axis of the axial fan. The heat sink fan described in Crab.

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