JP3662245B2 - Electronic component cooling system - Google Patents

Description

  The present invention relates to an electronic component cooling apparatus used for cooling an electronic component such as a microprocessor unit (MPU).

  Recent microprocessor units are highly integrated to improve performance, and the amount of heat generated is greatly increased. Therefore, an electronic component cooling device called an MPU cooler is used for the purpose of forcibly cooling the microprocessor unit itself. FIG. 8 shows an example of a conventional heat sink integrated fan. In this figure, 201 is a rotor abduction type motor in which the rotor rotates outside the stator, 202 is an impeller fixed to the rotor with a plurality of blades 203. , 205... Are webs that interconnect the motor housing 201 </ b> A and the casing 204, and 206 is a plurality of recesses in which a part (about 1/3) of the impeller 202 is accommodated. A heat sink provided with a plurality of heat radiation fins 207. In this fan, the heat radiating fins 207 are provided so as to surround the impeller 202, and all the heat radiating fins 207 are provided so as to be orthogonal to the respective sides of the casing 204. The blades 203... Provided on the impeller 202 are configured to suck air from the heat sink 206 side and discharge the air to the web 205.

  If air is sucked from the heat sink 206 side and discharged to the web 205... Like the conventional cooling device, the heat sink 206 becomes an obstacle that blocks the intake side of the fan, so the air blowing efficiency is deteriorated and the cooling performance. There is a problem of getting worse. Further, since the air heated by the heat emitted from the heat sink 206 flows around the motor 201, the temperature inside the motor 201 becomes high and the life of the motor 201 is shortened.

  Further, in the conventional cooling device, the heat dissipating fins 207 are arranged so as to be perpendicular to the respective sides of the casing 204 irrespective of the air flow, so that a sufficient air flow can be created around all the heat dissipating fins 207. The actual heat radiation area was not necessarily large.

  An object of the present invention is to provide an electronic component cooling apparatus that has a high heat sink cooling efficiency and a long motor life.

  Another object of the present invention is to provide a thin electronic component cooling apparatus.

  Still another object of the present invention is to provide an electronic component cooling apparatus that generates less noise.

  Another object of the present invention is to provide an electronic component cooling device that can be easily attached to an electronic device.

  Still another object of the present invention is to provide an electronic component cooling apparatus that is compact and easy to assemble.

  The present invention provides a motor having a rotor and a stator, an impeller having a plurality of blades and fixed to the rotor, a casing surrounding the motor, and a plurality of housings that interconnect the motor housing and the casing. An electronic component cooling apparatus including a web and a heat sink having a plurality of heat radiation fins provided on a base and having a heat sink fixed to a casing is an object of improvement.

  The plurality of radiating fins are provided on the base so as to surround at least a part of the periphery of the impeller. The cooling device can be thinned by enclosing most of the periphery of the impeller with a plurality of heat radiation fins. In the present invention, the plurality of blades of the impeller are configured such that air is sucked from the plurality of web sides and air flows toward the plurality of radiation fins. The plurality of heat radiating fins are arranged on the base so that the air flow flowing out from the rotating impeller is guided to the outside through a flow path formed between the heat radiating fins. If it does in this way, the flow of sufficient air can be made around each radiation fin, and the substantial radiation area can be enlarged. As a result, the cooling performance can be further enhanced.

  When air is sucked from the web side, wind noise increases due to the presence of the web, and noise increases. Therefore, if the web-side edges of the plurality of blades are separated from the web toward the radially outer side, wind noise can be reduced.

  In order to increase the heat radiation area and increase the heat radiation efficiency, it is preferable to increase the heat radiation area by increasing the height of the heat radiation fins extending from the base of the heat sink as much as possible. However, it has been found that when air is sucked from the web side, if the height of the heat dissipating fins is made too high, not only will the noise increase, but cooling efficiency may worsen. These problems occur when air is sucked from the web side, and if the height of the heat dissipating fins is too high, air is sucked into the inside from the outside of the heat dissipating fins (particularly near the casing). Occur. The air sucked from the outside of the radiating fins collides with the air sucked from the web side, generating noise and reducing the cooling efficiency by reducing the flow rate of the air sucked from the web side. Conceivable. Therefore, as in the present invention, if the radiating fin is extended from the base so as not to exceed the web-side edge of the plurality of blades, air is sucked into the inside from the outside of the radiating fin (particularly near the casing). Can be suppressed. As a result, the generation of noise can be suppressed, and the decrease in cooling efficiency can be suppressed.

  The impeller can be composed of a plurality of blades and a cup-shaped member having a plurality of blades fixed on the outer periphery. The air located between the cup-shaped member of the impeller and the surface of the base of the heat sink is difficult to move even if the impeller rotates. Therefore, the surface of the base of the heat sink that faces the cup-shaped member of the impeller cannot be actively cooled. A plurality of ribs for air agitation can be provided on the cup-shaped member of the impeller at a portion facing the surface of the base of the heat sink. If it does in this way, the air which exists between the cup-shaped member of an impeller and the surface of the base of a heat sink can be stirred positively, and cooling performance can be improved further. The plurality of ribs are preferably provided corresponding to the plurality of blades, respectively, and extend from the central region of the cup-shaped member to the rear edge of the corresponding blade. In this way, not only the air is agitated, but the agitated air can be discharged smoothly, and the cooling performance is further enhanced.

  Each of the plurality of radiating fins is preferably composed of a first portion facing a part of an edge on the base side of the plurality of blades and a second portion positioned outside the plurality of blades. . Providing the first portion that opposes a part of the base side edge of the plurality of blades increases the thickness of the apparatus but improves the cooling efficiency.

  If the radiating fins are formed so that the two virtual planes extending from both sides in the thickness direction of the radiating fins intersect in the space surrounded by the plurality of radiating fins, the radiating fins against the air flow sent from the impeller side Air resistance is reduced, heat dissipation efficiency is increased, and wind noise is reduced.

  When the base of the heat sink has a substantially quadrangular outline shape, it is preferable to provide a pair of pillars integrally at a pair of corners located on the diagonal of the base and screw the casing to the pair of pillars. . As a result, the number of screwing points is reduced, and assembly is facilitated. Further, when the pillars are paired, a plurality of heat dissipating fins can be extended to the end of the base excluding the pair of pillars, so that the heat dissipating area can be increased.

  If the casing is provided with a connector having a plurality of terminals for receiving power necessary for driving the motor, the electronic component cooling device can be attached to the electronic device without worrying about the wiring cord. Even if the device breaks down, it can be easily replaced. In addition, when the connector portion is provided at the corner portion of the casing without the screwing portion, the presence of the connector portion does not hinder the casing screwing operation.

  The casing includes a base portion that has a contour shape substantially similar to the contour shape of the base of the heat sink and comes into contact with the plurality of heat radiation fins, and a cylindrical portion that is connected to the base portion and surrounds a part of the impeller. If it comprises and a connector part is provided in a cylindrical part, a connector part can be arrange | positioned without projecting outside the base part largely.

  In the present invention, air is sucked from the web side and air is caused to flow through the flow path formed between the heat dissipating fins of the plurality of heat dissipating fins. Increase the cooling performance. Further, since the motor is not exposed to the air heated by the heat sink, the temperature inside the motor does not become higher than necessary, and the life of the motor can be extended.

  According to the present invention, air is sucked from the web side and air is allowed to flow through the flow path formed between the heat dissipating fins of the plurality of heat dissipating fins. There is an advantage that the cooling performance can be increased by increasing the temperature. Further, since the motor is not exposed to the air heated by the heat sink, the temperature inside the motor does not become higher than necessary, and there is an advantage that the life of the motor can be extended.

  Also, if the heat dissipating fins are extended from the base so that they do not exceed the web-side edges of multiple blades, air can be prevented from being sucked into the inside from the outside of the heat dissipating fins (particularly near the casing). Generation | occurrence | production can be suppressed and the fall of cooling efficiency can be suppressed.

  Furthermore, if a plurality of ribs for air agitation are provided in the part facing the surface of the base of the heat sink, the air between the impeller cup-shaped member and the surface of the heat sink base is actively agitated to provide cooling performance. Can be further increased.

  In addition, if the heat dissipation fin is formed so that two virtual surfaces extending from both sides in the thickness direction of the heat dissipation fin intersect in the space surrounded by the plurality of heat dissipation fins, the heat dissipation fin against the air flow sent from the impeller side The air resistance is reduced, the heat dissipation efficiency is increased, and the wind noise is reduced.

  In addition, if the casing is provided with a connector having at least a plurality of terminals for receiving power necessary for driving the motor, the electronic component cooling device can be attached to the electronic device without worrying about the wiring cord, and the electronic component cooling can be performed. Even if the device breaks down, there is an advantage that the replacement work can be easily performed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 3 are a partially cutaway front view, a partially cutaway side view, and a partially cutaway rear view of an embodiment of the electronic component cooling apparatus of the present invention. In these drawings, 1 is a rotor abduction type motor in which the rotor 2 rotates outside the stator 3, and 4 is a cup-shaped member having seven blades 5 fixed to the peripheral wall portion 6 b of the cup-shaped member 6. 7 is an impeller in which seven air stirring ribs 7 are fixed to a bottom wall portion 6a of the six. The impeller 4 is integrally formed of a synthetic resin such as polybutylene terephthalate. In this embodiment, a two-phase brushless DC motor is used as the motor 1. As shown in FIG. 2, the stator 3 of the motor 1 is formed by winding an exciting winding 8 b around an iron core 8 a, and a cylindrical boss portion 10 provided at the center of a synthetic resin housing 9. It is fixed. A bearing holder 11 is fitted to the boss portion 10 of the housing 9, and a pair of bearings 12 are accommodated in the bearing holder 11 with an interval in the axial direction. One end of the rotating shaft 13 is rotatably supported by a pair of bearings 12 (one not shown), and the other end of the rotating shaft 13 is fitted in a fitting hole formed in the bottom wall portion 6a of the cup-shaped member 6. (FIG. 3). A circuit board 14 on which electronic components constituting a drive circuit are mounted is also fixed to the housing 9. On the inner peripheral surface of the peripheral wall portion 6b of the cup-shaped member 6, a magnetic conducting ring 16 that supports a plurality of magnetic poles 15 made of permanent magnets on the inner peripheral surface is fixed. The rotor 2 includes a cup-shaped member 6, magnetic poles 15, and a magnetic conducting ring 16.

  The housing 9 of the motor 1 is connected to a casing 18 whose contour is rectangular or quadrangular via three webs 17a to 17c (FIG. 1). In the present embodiment, the housing 9, the webs 17a to 17c, and the casing 18 are integrally formed of a synthetic resin such as polybutylene terephthalate. The webs 17a to 17c are provided at intervals of approximately 120 degrees, and in particular, the web 17c is configured to be capable of guiding the cord 19. The casing 18 is provided with through holes for inserting mounting screws 20 at four corners, and stepped portions 18a for accommodating the heads of the mounting screws are formed at portions where these through holes are formed. As shown in FIG. 2, the casing 18 has a thickness dimension that is thicker than the webs 17 a to 17 c and slightly surrounds the outer periphery of the impeller 4. Specifically, the casing 18 has a thickness dimension that extends to a position that is lowered about 1.5 to 2.5 mm toward the heat sink 21 from the radially outer end 5b1 of the edge 5b on the web 17a to 17c side of each blade 5. Has. If it does in this way, it can control that air is inhaled from the outside (especially part near a casing) of radiation fin 23. As a result, the generation of noise can be suppressed, and the decrease in cooling efficiency can be suppressed.

  The blades 5 provided on the outer periphery of the peripheral wall of the cup-shaped member 6 of the impeller 4 sucks air from the webs 17a to 17c and radiates heat from the plurality of heat radiating fins 23 provided on the base 22 of the heat sink 21. It is comprised so that air may flow through the flow path formed between the fins. The rear edge 5a of each blade 5 (the edge facing the surface of the base 22 of the heat sink 21) extends beyond the bottom wall portion 6a of the cup-shaped member 6 in the axial direction. In the present embodiment, the gap dimension between the rear edge 5a of each blade 5 and the edge of the rib 7 and the surface of the base 22 of the heat sink 21 is set to about 1 mm. If the gap size is set to 2 mm or less, the flow velocity of the air flowing on the surface of the base 22 becomes faster. Further, in this embodiment, the end edges 5b on the webs 17a to 17c side of the blades 5 are configured to be separated from the webs toward the radially outer side. When such a blade 5 is used, when air is sucked from the web side, wind noise can be reduced even if the thickness of the fan is reduced, and generation of noise can be suppressed.

  Further, a plurality of air stirring ribs 7 provided on the outer surface of the bottom wall portion 6a of the cup-shaped member 6 and facing the surface of the base 22 of the heat sink 21 are provided corresponding to the blades 5. . Each rib 7 extends continuously from the central region of the cup-shaped member 6 to the rear end edge 5a of the corresponding blade 5. In the present embodiment, the radially inner ends of the ribs 7 are not coupled to each other, and no ribs are present in the central region of the cup-shaped member 6. In this way, the air on the surface of the base 22 of the heat sink 21 can be moved smoothly. If the air is simply agitated, it is not necessary to provide each rib 7 corresponding to each blade 5, and if a rib having an appropriate shape and length is provided on the bottom wall portion 6 a of the cup-shaped member 6. Good.

  The heat sink 21 has a configuration in which a plurality of heat radiation fins 23 are integrally provided on one surface of a plate-like base 22, and is integrally formed of a metal having good thermal conductivity such as aluminum. Yes. The base 22 has a quadrangular outline shape, and pillars 24 each having a screw hole into which a mounting screw 20 for fixing the casing 18 is screwed project. The heat radiating fins 23 are arranged along the four sides of the base 22 so as to surround the outer periphery of the impeller 4 and project from the base 22. The heat radiating fins 23 are preferably arranged on the base 22 so that the air flowing out from the rotating impeller 4 is led to the outside. Further, in this embodiment, each radiation fin 23 extends to a position not exceeding the edge 5b of each blade 5 on the webs 17a to 17c side.

  Since the outflow direction of the airflow varies depending on the location and is not constant, the heat dissipating fins 23 are arranged so that the air flows out along the surfaces of the heat dissipating fins 23 as much as possible in practice. It will be. In this embodiment, the radiation fins 23 are arranged so as to form an angle of about 30 degrees with respect to a line orthogonal to each side of the base 22. This angle is a suitable angle when the rotation speed of the impeller 4 is 4000 rpm to 6000 rpm. The angle increases as the rotation speed of the impeller 4 increases, and decreases as the rotation speed of the impeller 4 decreases. do it.

  Further, in this embodiment, among the heat dissipating fins 23 arranged along one side of the base 22, a plurality of sheets located on the rear side in the rotation direction of the impeller 4 (the direction indicated by the arrows in FIGS. 1 and 3). The lengths of the radiation fins 23a to 23h (FIG. 3) are determined so that envelopes (imaginary lines) connecting the inner end portions thereof are convex toward the inside. Moreover, about the remaining radiation fin 23 located in the front side of the rotation direction of the impeller 4, each length is defined so that the envelope which connects those inner edge parts may become substantially linear form. Incidentally, when the dimension of one side of the base 22 is 45 mm and the gap dimension between the radiation fins is 0.7 mm, the lengths of the radiation fins 23a to 23h are 3.3 mm, 4.5 mm, 5.3 mm, They were 6.1 mm, 5.9 mm, 5.7 mm, 4.5 mm, and 3.8 mm. The length of the remaining heat dissipating fins 23 was constant 3.3 mm. The convex shape formed by these heat radiation fins 23a to 23h is employed to increase the heat radiation surface area without hindering the outflow of air as much as possible. In the present embodiment, the remaining radiating fins 23 positioned on the front side in the rotational direction of the impeller 4 are configured so that the envelope connecting the inner end portions thereof is substantially linear. This is in order not to disturb the flow of air flowing between the fins.

  Based on this embodiment, a cooling device having dimensions of 45 mm × 45 mm × 12 mm is made, and when the rotational speed of the impeller 4 is 6000 rpm and the ambient temperature is 25 ° C., a 10 W heat generation model is placed on the heat sink 21. When the cooling performance was tested, the temperature rise value of the exothermic model was 17 ° C. Incidentally, when the same test was performed under the same conditions using the conventional fan (45 mm × 45 mm × 13 mm) shown in FIG. 4, the temperature rise value of the exothermic model was 39 ° C. In addition, when a heat sink-integrated fan currently on the market was tested, none of the heat generation models had a temperature rise value lower than 20 ° C.

  According to the present embodiment, among the plurality of radiation fins arranged along one side of the base of the heat sink having a quadrangular outline shape, the length of each of the plurality of radiation fins positioned on the rear side in the rotation direction of the impeller. Since the envelope connecting the inner ends of each radiating fin is convex toward the inside, the radiating area of the radiating fin can be increased without hindering the outflow of air, and the cooling performance There are advantages that can be enhanced. Moreover, since the thickness of the casing is reduced and the impeller is surrounded by the majority of the plurality of heat dissipating fins, the thickness of the entire apparatus can be significantly reduced as compared with the conventional apparatus.

  In the above embodiment, the radiating fins 23 are all inclined at the same angle with respect to the side of the base 22, but it is needless to say that the inclination angle may be varied depending on the location. Moreover, in the said Example, although the radiation fin 23 ... has comprised linear form, of course, you may curve a radiation fin so that the flow of air may be followed.

  4 is a plan view of another embodiment of the present invention, FIG. 5 is a right side view of the embodiment of FIG. 4, FIG. 6 is a plan view of a heat sink used in this embodiment, and FIG. 7 is a line AA in FIG. A schematic sectional view is shown. In this embodiment, the same members as those in the embodiment shown in FIGS. 1 to 3 are given the same reference numerals as those in the embodiment shown in FIGS. 1 to 3 plus 100. is there. The present embodiment is significantly different from the embodiments of FIGS. 1 to 3 in terms of the shape of the casing 118, the shapes and arrangement of the radiation fins F1 to F60, the use of the connector portion 125, and the number of pillars. The casing 118 of the present embodiment has a base portion 118A having a contour shape substantially similar to the contour shape of the base 122 of the heat sink 121 and contacting the plurality of heat radiation fins F1 to F60, and one end connected to the base portion 118A. And a cylindrical portion 118B surrounding a part of the impeller. In the base portion 118A of the casing 118, a notch 118A1 is formed at a corner portion located below the connector portion 125 fixed to the cylindrical portion 118B. Therefore, a part of the radiation fins F23 to F25 is exposed from this portion. Further, through holes (not shown) through which the mounting screws 120 are inserted are formed in a pair of corner portions located on the diagonal line of the base portion 118A. As shown in FIG. 7, the casing 118 has a height (length in the axial direction) surrounding about ¾ of the blade 105 of the impeller 104. Therefore, the cylindrical portion 118 </ b> B constitutes most of the air path of the impeller 104. In this way, the thickness of the apparatus is increased as in the conventional apparatus shown in FIG. 8, but the cooling fins can be further improved because a plurality of heat radiation fins provided on the heat sink 121 can be extended to the lower side of the blade 105. Become.

  The connector part 125 provided integrally at the end of the cylindrical part 118B of the casing 118 opposite to the heat sink 121 has a male connector structure. Pin terminals 119a and 119b arranged in the connector portion 125 are a positive terminal and a negative terminal for supplying power, and a pin terminal 119c is a signal output terminal that outputs a signal indicating that the motor has stopped. In FIG. 4, the end cover of the motor housing 109 is removed to show the fixed state of each pin terminal.

  Next, the structure of the heat sink 121 will be described mainly with reference to FIGS. 6 and 7. In the heat sink 121 of this embodiment, the base 122 has a substantially quadrangular outline shape, and a pair of pillars 124 are integrally provided at a pair of corners located on the diagonal of the base 122. The radiation fins F1 to F60 respectively include first portions F1a to F60a facing the base side edge 105a of the plurality of blades 105 and second portions F1b to F60b positioned on the radially outer side of the plurality of blades 105. It consists of. By providing the first portions F1a to F60a on the heat radiating fins F1 to F60, the plurality of heat radiating fins form a recess for accommodating a part of the impeller 104 at the center. If it demonstrates based on the radiation fin F46, each radiation fin has the shape where two virtual surfaces which extended the both sides | surfaces of the thickness direction cross in the space enclosed with the several radiation fin. That is, the thickness is reduced toward the inner side in the radial direction. This is to ensure a necessary and sufficient air flow path between two adjacent heat dissipating fins. If the width of the air flow path is too narrow or too wide, the cooling efficiency is lowered. Therefore, it is necessary to determine the width dimension of the air flow path formed between the two adjacent radiating fins according to the rotation speed and the air volume of the motor.

  Incidentally, the apparatus of the present embodiment is an example in which the external dimensions of the heat sink are 45 mm × 45 mm, the height of the second portion of the heat dissipating fin is 6.5 mm, and the rotational speed of the impeller 104 is 5000 rpm. In this case, the arrangement configuration of each radiating fin is determined as follows. The angle θ1 between the center line L1 of the radiation fin F46 (F1, F16, F31) located at the center of each side of the heat sink and the line L2 extending from the motor axis center C and orthogonal to each side is 10 °. In this manner, the angle θ2 between both side surfaces of each radiating fin is set to 5 ° to 6 °. The other radiating fins are arranged in order so that the angle .theta.3 between adjacent radiating fins is 6 DEG. The radiation fins F1 to F60 extend to the end of the heat sink 121 except for the radiation fins F8 to F10 and F38 to F40 located at the pair of pillars.

  In this embodiment, as shown in FIG. 7, the plurality of blades 105 are formed integrally with an annular hub 105A. The hub 105 </ b> A is fitted on the outer periphery of the cup-shaped member 106 of the impeller 104.

  Based on this embodiment, a cooling device having a size of 45 mm × 45 mm × 18 mm is made, and when the rotational speed of the impeller 104 is 5000 rpm and the ambient temperature is 25 ° C., a 10 W heating model is placed on the heat sink 121. When the cooling performance was tested, the temperature rise value of the exothermic model was 17 ° C. as in the examples shown in FIGS. Compared with the embodiment shown in FIGS. 1 to 3, in this embodiment, the thickness of the cooling device is increased, but the rotational speed of the impeller 104 can be reduced by as much as 1000 rpm. There is an advantage that can be reduced.

It is a partially cutaway front view of one Example of the electronic component cooling device of this invention. It is a partially cutaway side view of the embodiment of FIG. It is a partially cutaway rear view of the embodiment of FIG. It is a top view of the other Example of this invention. It is a right view of the Example of FIG. It is a top view of a heat sink. It is an AA line schematic sectional drawing of FIG. It is a partially cutaway sectional view of a conventional heat sink integrated fan.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor abduction type motor 2 Rotor 3 Stator 4,104 Impeller 5,105 Blade 6,106 Cup-shaped member 7 Air stirring rib 9,109 Housing 17a-17c, 117a-117c Web 18,118 Casing 21,121 Heat sink 22, 122 Base 23, F1-F60 Radiation fin 24, 124 Pillar 125 Connector part

Claims (9)

A rotor abduction motor whose rotor rotates outside the stator;
An impeller fixed to the rotor having a plurality of blades;
A casing surrounding the motor;
A plurality of webs interconnecting the motor housing and the casing;
In an electronic component cooling device comprising a heat sink fixed to the casing with a plurality of heat radiation fins on a base,
The plurality of radiating fins are provided on the base so as to surround at least a part of the impeller,
The plurality of blades of the impeller are configured to suck air from the plurality of web sides and flow air toward the plurality of heat dissipating fins,
The plurality of heat dissipating fins are arranged so as to guide the air flow flowing out of the rotating impeller to the outside through a flow path formed between the heat dissipating fins,
2. An electronic component cooling apparatus according to claim 2, wherein two imaginary planes obtained by extending both side surfaces in the thickness direction of the radiating fin intersect in a space surrounded by the plurality of radiating fins . The impeller is composed of the plurality of blades and a cup-shaped member having the plurality of blades fixed to the outer periphery,
The electronic component cooling device according to claim 1, wherein the cup-shaped member of the impeller is provided with a plurality of ribs for air agitation at a portion facing the surface of the base.   The electronic component cooling according to claim 2, wherein the plurality of ribs are provided corresponding to the plurality of blades, respectively, and extend from a central region of the cup-shaped member to a corresponding rear end edge of the blade. apparatus.   2. Each of the plurality of heat dissipating fins includes a first portion facing an end edge on the base side of the plurality of blades and a second portion positioned outside the plurality of blades. The electronic component cooling device described in 1. The base of the heat sink has a substantially rectangular contour;
A pair of pillars are integrally provided at a pair of corners located diagonally on the base,
The electronic component cooling device according to claim 1, wherein the casing is screwed to the pair of pillars. The electronic component cooling device according to claim 5 , wherein the plurality of heat dissipating fins extend to an end portion of the base except for the pair of pillars. A motor having a rotor and a stator;
An impeller fixed to the rotor having a plurality of blades;
A frame-like casing for fixing the motor;
A plurality of webs interconnecting the motor housing and the casing;
In an electronic component cooling device comprising a heat sink fixed to the casing with a plurality of heat radiation fins on a base,
The plurality of heat dissipating fins are provided in the base so as to form a recess that accommodates a part of the impeller in a central portion,
The plurality of blades of the impeller are configured to suck air from the plurality of web sides and flow air through a flow path formed between the radiation fins of the plurality of radiation fins,
It said casing connector portion having a plurality of terminals for receiving power necessary for driving of at least the motor provided we are in,
2. An electronic component cooling apparatus according to claim 2, wherein two imaginary planes obtained by extending both side surfaces in the thickness direction of the radiating fin intersect in a space surrounded by the plurality of radiating fins . The base of the heat sink has a substantially rectangular contour;
A pair of pillars are integrally provided at a pair of corners located diagonally on the base,
The casing is screwed to the pair of pillars,
The electronic component cooling device according to claim 7 , wherein the connector portion is provided at a corner portion of the casing having no screwing portion. The casing has a base shape that is substantially the same as that of the base of the heat sink and is in contact with the plurality of heat dissipating fins. It consists of a cylindrical part that surrounds,
The electronic component cooling device according to claim 8 , wherein the connector portion is provided in the cylindrical portion.

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