JP3533319B2 - Electronic component cooling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component cooling device used for cooling electronic components such as a microprocessor unit (MPU).

[0002]

2. Description of the Related Art Recent microprocessor units are highly integrated in order to improve their 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 having a plurality of blades 203 ...
Reference numeral 204 denotes a casing surrounding the motor 201,
Reference numeral 205 denotes a motor housing 201A and a casing 2
Reference numeral 206 is a web for interconnecting 04, and 206 is a heat sink provided with a plurality of heat radiation fins 207 so as to form a recess in which a part (about 1/3) of the impeller 202 is housed. In this fan, the radiation fins 207
Are provided so as to surround the impeller 202, and all the radiation fins 207 are provided so as to be orthogonal to the respective sides of the casing 204. Then, the blades 203 provided on the impeller 202 suck the air from the heat sink 206 side as shown by the arrow in the figure, and the web 2
The air is discharged to the 05 ... side.

[0003]

Like the conventional cooling device, the web 2 is obtained by sucking air from the heat sink 206 side.
When air is discharged to the 05 .. side, the heat sink 206 becomes an obstacle that blocks the intake side of the fan, and thus there is a problem that the ventilation efficiency becomes poor and the cooling performance becomes poor. Further, since the air heated by the heat generated 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 becomes short.

Further, in the conventional cooling device, the radiation fin 20
7 ... are arranged so as to be orthogonal to each side of the casing 204 irrespective of the flow of air, so that all the radiation fins 20
A sufficient air flow could not be created around 7, and the actual heat dissipation area was not necessarily large.

It is an object of the present invention to provide an electronic component cooling device having a high heat sink cooling efficiency and a long motor life.

Another object of the present invention is to provide an electronic component cooling device having a small thickness.

Still another object of the present invention is to provide an electronic component cooling device which produces less noise.

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

Yet another object of the present invention is to provide an electronic component cooling device which is compact and easy to assemble.

[0010]

According to the present invention, there is provided a motor having a rotor and a stator, an impeller having a plurality of blades fixed to the rotor, a casing surrounding the motor, and a motor housing. An electronic component cooling device including a plurality of webs interconnecting a casing and a heat sink having a plurality of heat radiation fins provided on a base, and having the heat sink fixed to the casing is an object of improvement.

The plurality of heat radiation fins are provided on the base so as to surround at least a part of the periphery of the impeller. If the most part around the impeller is surrounded by a plurality of heat radiation fins, the thickness of the cooling device can be reduced. In the present invention, the plurality of blades of the impeller are configured to suck air from the plurality of web sides and blow air toward the plurality of heat radiation fins. Then, a plurality of radiating fins are arranged on the base so that the airflow flowing out from the rotating impeller is guided to the outside through the flow path formed between the radiating fins. By doing so, a sufficient air flow can be created around each heat radiation fin, and the substantial heat radiation area can be increased. As a result, the cooling performance can be further enhanced.

When the air is sucked from the web side, the presence of the web makes the wind noise loud and the noise loud. Therefore, the wind-cutting noise can be reduced by arranging the web-side edges of the plurality of blades so as to separate from the web as they go radially outward.

In order to increase the heat dissipation area and improve the heat dissipation efficiency, it is considered preferable to increase the height of the heat dissipation fin extending from the base of the heat sink as much as possible to increase the heat dissipation area. However, when air is sucked from the web side, if the height of the radiation fins is too high,
It was found that not only the noise becomes louder, but the cooling efficiency may worsen. These problems are caused when the air is sucked in from the web side, and if the height of the heat radiation fin is too high, the air is sucked in from the outside of the heat radiation fin (particularly the portion near the casing). Occur. The air sucked from the outside of the radiating fins collides with the air sucked from the web side to generate noise, and the flow velocity of the air sucked from the web side is reduced to reduce the cooling efficiency. Conceivable. Therefore, as in the present invention, when the radiation fin is extended from the base so as not to exceed the web-side edges of the plurality of blades, the outside of the radiation fin (particularly the portion near the casing)
It is possible to prevent air from being sucked in from the inside. As a result, the generation of noise can be suppressed, and the reduction 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 to 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 hard to move even if the impeller rotates. Therefore, the surface of the base of the heat sink facing the cup-shaped member of the impeller cannot be positively cooled. The cup-shaped member of the impeller may be provided with a plurality of ribs for agitating air at a portion facing the surface of the base of the heat sink. By doing so, the air between the cup-shaped member of the impeller and the surface of the base of the heat sink can be positively stirred to further enhance the cooling performance. The plurality of ribs are preferably provided corresponding to the plurality of blades and extend from the central region of the cup-shaped member to the rear end edge of the corresponding blade. In this way, not only can the air be agitated, but the agitated air can be smoothly discharged, further improving the cooling performance.

Each of the plurality of heat radiation fins is composed of a first portion facing a part of the base-side end edge of the plurality of blades and a second portion located outside the plurality of blades. Is preferred. Providing the first portion facing a part of the base-side edge of the plurality of blades increases the thickness of the device, but improves the cooling efficiency.

When the radiating fins are formed so that the two imaginary 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 air flow sent out from the impeller side can be prevented. The air resistance of the radiation fins is reduced, the radiation efficiency is increased, and the wind noise is reduced.

When the base of the heat sink has a substantially quadrangular outline shape, a pair of pillars are integrally provided at a pair of corners located on the diagonal of the base, and the casing is screwed to the pair of pillars. Is preferred. In this way, the number of screwed points is reduced, and the assembly becomes easy. Further, when the pillars are paired, the plurality of heat radiation fins can be extended to the end portion of the base except for the pair of pillars, so that the heat radiation area can be increased.

If the casing is provided with a connector portion having a plurality of terminals for receiving at least electric power required 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 component cooling device fails, the replacement work can be easily performed. Further, when the connector portion is provided at the corner portion of the casing having no screw fastening portion, the presence of the connector portion does not hinder the screw fastening work of the casing.

The casing has a base portion having a contour shape substantially similar to that of the base of the heat sink and in contact with a plurality of heat radiation fins, and a cylindrical shape having one end connected to the base portion and surrounding a part of the impeller. When the connector portion is provided on the tubular portion, the connector portion can be arranged without largely protruding to the outside of the base portion.

In the present invention, since air is sucked from the web side and the air is caused to flow through the flow passage formed between the heat radiating fins of the plurality of heat radiating fins, there is no large obstacle on the suction side. Blower efficiency can be improved to improve cooling performance. Further, since the motor is not exposed to the air heated by the heat sink, the temperature inside the motor does not rise more than necessary, and the life of the motor can be extended.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. 1 to 3 are a partially cutout front view, a partially cutout side view, and a partially cutout rear view of an embodiment of an electronic component cooling device of the present invention. In these figures, 1 is a rotor abduction motor in which a rotor 2 rotates outside a stator 3, and 4 is a cup-shaped member 6 in which seven blades 5 are fixed to a peripheral wall portion 6b. This is an impeller in which seven ribs 7 for agitating air are fixed to the bottom wall portion 6a of 6. The impeller 4 is integrally formed of 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 constructed by winding an exciting winding 8b around an iron core 8a, and a cylindrical boss portion 10 provided in a central portion of a housing 9 made of synthetic resin. It is fixed. A bearing holder 11 is fitted in the boss portion 10 of the housing 9, and a pair of bearings 12 are housed in the bearing holder 11 with a gap in the axial direction. One end of the rotary shaft 13 is rotatably supported by a pair of bearings 12 (one of which is not shown), and the other end of the rotary shaft 13 is the bottom wall portion 6 a of the cup-shaped member 6.
It is fitted in the fitting hole formed in (FIG. 3). Also fixed to the housing 9 is a circuit board 14 on which electronic components forming a drive circuit are mounted. On the inner peripheral surface of the peripheral wall portion 6b of the cup-shaped member 6, a plurality of magnetic poles 1 made of permanent magnets are formed.
A magnetic conducting ring 16 supporting 5 ... on the inner peripheral surface is fixed. The rotor 2 includes a cup-shaped member 6, magnetic poles 15 and a magnetic conductive ring 16.

The housing 9 of the motor 1 is connected to a casing 18 having a rectangular or quadrangular contour through three webs 17a to 17c (FIG. 1). In this embodiment, the housing 9, the webs 17a to 17c, and the casing 18 are integrally formed of synthetic resin such as polybutylene terephthalate. Webs 17a-17
The c's are provided at intervals of about 120 degrees, and in particular, the web 17c has a structure capable of guiding the cord 19. The casing 18 is provided with through holes into which the mounting screws 20 are inserted at the four corners thereof, and stepped portions 18a for accommodating the heads of the mounting screws are formed in the portions where these through holes are formed. Further, as shown in FIG.
Is thicker than the webs 17a to 17c and has a thickness dimension that slightly surrounds the outer circumference of the impeller 4. Specifically, the webs 17a to 17c of each blade 5 are
The casing 18 has a thickness dimension that extends to a position about 1.5 to 2.5 mm lower than the radially outer end 5b1 of the side edge 5b on the heat sink 21 side. With this configuration, it is possible to prevent air from being sucked in from the outside (particularly the portion near the casing) of the radiation fin 23. As a result, the generation of noise can be suppressed, and the reduction 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 suck air from the webs 17a to 17c side, and a plurality of heat radiation fins 23 provided on the base 22 of the heat sink 21. The air is made to flow through the flow path formed between the respective heat radiation fins. A rear end edge 5a of each blade 5 (an end 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 this embodiment, the gap 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. This gap size is 2m
When it is set to m or less, the flow velocity of the air flowing on the surface of the base 22 becomes faster. Further, in this embodiment, each blade 5
The end edges 5b on the side of the webs 17a to 17c are configured so as to be separated from the web as they go radially outward. When such a blade 5 is used, when the air is sucked from the web side, the wind noise can be reduced and the generation of noise can be suppressed even if the thickness of the fan is reduced.

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

The heat sink 21 has a structure in which a plurality of radiating fins 23 ... Are integrally provided on one surface of a plate-shaped base 22. The heat sink 21 is integrally formed of a metal having a high thermal conductivity such as aluminum. It is molded. 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 are screwed are projectingly provided at four corners thereof. Radiating fin 2
3 ... 4 of the base 22 so as to surround the outer circumference of the impeller 4.
It is arranged along one side and protrudes from the base 22. The heat radiation fins 23 are preferably arranged on the base 22 so as to guide the air flowing out of the rotating impeller 4 to the outside. Further, in this embodiment, each of the radiation fins 23 ...
Extends to a position that does not exceed the edge 5b of each blade 5 on the web 17a to 17c side.

The outflow direction of the air flow varies depending on the place,
Since they are not constant, the heat radiation fins 23 are actually arranged so as not to hinder the outflow of air as much as possible and to allow the air to flow along the surface of each heat radiation fin 23.
In the present embodiment, the heat 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. In addition, the rotation speed of the impeller 4 is 40
In the case of 00 rpm to 6000 rpm, the angle is suitable,
This angle may be increased as the rotation speed of the impeller 4 increases, and may be decreased as the rotation speed of the impeller 4 decreases.

Further, in this embodiment, among the heat dissipating fins 23 arranged along one side of the base 22, the heat dissipating fins 23 are located on the rear side in the rotation direction of the impeller 4 (the direction shown by the arrow in FIGS. 1 and 3). A plurality of radiation fins 23a-23h (FIG. 3)
Have their lengths determined so that the envelope (imaginary line) connecting the inner ends thereof is convex toward the inside. The lengths of the remaining radiating fins 23 located on the front side in the rotation direction of the impeller 4 are determined so that the envelope connecting the inner ends of the radiating fins 23 is substantially linear. By the way, the size of one side of the base 22 is 45 mm.
And, when the gap size between each radiation fin is 0.7mm,
The length of the radiation fins 23a to 23h is 3.3 m in order.
m, 4.5 mm, 5.3 mm, 6.1 mm, 5.9 m
m, 5.7 mm, 4.5 mm and 3.8 mm. The length of the remaining radiating fins 23 was constant at 3.3 mm.
The convex shape formed by these heat radiation fins 23a to 23h is adopted in order to increase the area of the heat radiation surface while preventing the outflow of air as much as possible. Further, in the present embodiment, the remaining heat radiation fins 23 located on the front side in the rotation direction of the impeller 4 are configured so that the envelopes connecting the inner ends thereof are substantially linear. This is to prevent the flow of air flowing between the fins from being obstructed.

Based on this embodiment, 45 mm × 45 mm ×
When a cooling device with a size of 12 mm was made, the rotation speed of the impeller 4 was set to 6000 rpm, and the ambient temperature was set to 25 ° C., a heat generation model of 10 W was placed on the heat sink 21 to test the cooling performance. The temperature rise value was 17 ° C. By the way, when the same test was conducted under the same conditions using the conventional fan (45 mm × 45 mm × 13 mm) shown in FIG. 4, the temperature rise value of the heat generation model was 3
It was 9 ° C. In addition, when the other commercially available heat sink-integrated fans were tested, none of the temperature rise values of the heat generation model fell below 20 ° C.

According to the present embodiment, among the plurality of heat radiation fins arranged along one side of the base of the heat sink having a rectangular contour shape, the plurality of heat radiation fins located on the rear side in the rotational direction of the impeller are arranged. Since the length of each is determined so that the envelope connecting the inner ends of the radiation fins is convex toward the inside, the radiation area of the radiation fins can be increased without hindering the outflow of air. Further, there is an advantage that the cooling performance can be enhanced. Further, since the thickness of the casing is reduced and the impeller is surrounded by most of the plurality of heat radiation fins, the thickness of the entire device can be significantly reduced as compared with the conventional case.

In the above embodiment, the radiation fins 23 are all inclined at the same angle with respect to the sides of the base 22, but the inclination angle may be changed depending on the place. Further, in the above-mentioned embodiment, the heat radiation fins 23 ... Have a linear shape, but it goes without saying that the heat radiation fins may be curved so as to follow the flow of air.

FIG. 4 is a plan view of another embodiment of the present invention, and FIG.
4 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 schematic sectional view taken along the line AA of FIG. In this embodiment, the same members as the members of the embodiment shown in FIGS. 1 to 3 are designated by the reference numerals of the embodiment shown in FIGS. 1 to 3 plus 100. is there. The present embodiment is greatly different from the embodiments of FIGS. 1 to 3 in the shape of the casing 118, the shape 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 this 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 in contact with the plurality of heat radiation fins F1 to F60, and one end of the base portion 118A.
And a cylindrical portion 118B that is connected to and surrounds a part of the impeller. Base portion 118 of casing 118
In A, the connector portion 12 fixed to the tubular portion 118B is provided.
A cutout portion 118A1 is formed at a corner located on the lower side of 5. Therefore, from this part, the radiation fin F23
-A part of F25 is exposed. Also, the base portion 118
At a pair of corners located on the diagonal line of A, a mounting screw 12
A through hole (not shown) for inserting 0 is formed. The casing 118 has a height (axial length) that encloses about 3/4 of the blade 105 of the impeller 104 as shown in FIG. 7. Therefore, the tubular portion 118B
Form most of the wind path of the impeller 104. By doing so, the thickness of the device becomes thick as in the conventional device shown in FIG. 8, but since a plurality of heat radiation fins provided on the heat sink 121 can be extended to the lower side of the plate 105, the cooling efficiency is further increased. Become.

The connector portion 125 integrally provided at the end of the cylindrical portion 118B of the casing 118 opposite to the heat sink 121 has a male connector structure. Pin terminals 119a and 11 arranged on the connector part 125
9b is a plus terminal and a minus terminal for power supply,
The 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 heatsing 121 of the present embodiment, the base 122 has a substantially quadrangular outline shape, and the pair of pillars 124 are integrally provided at a pair of corner portions located on the diagonal line of the base 122. The radiating fins F1 to F60 are respectively first portions F1a to F60a facing the end edge 105a of the plurality of blades 105 on the base side and second portions F1b to F60b located radially outside of the plurality of blades 105. Composed of and. The heat radiation fins F1 to F60 have a first portion F1a.
By providing F60a to F60a, the plurality of radiating fins form a recess in the center thereof that accommodates a part of the impeller 104. Explaining based on the radiation fins F46, each radiation fin has a shape in which two virtual surfaces extending on both side surfaces in the thickness direction intersect in a space surrounded by a plurality of radiation fins. That is, the thickness becomes smaller toward the inner side in the radial direction. This is to secure a necessary and sufficient air flow path between two adjacent heat radiation fins. If the width of the air passage is too narrow or too wide, it causes a decrease in cooling efficiency. Therefore, depending on the number of rotations of the motor and the air volume,
It is necessary to determine the width dimension of the air flow path formed between two adjacent heat radiation fins.

Incidentally, in the device of this embodiment, the outer dimensions of the heat sink are 45 mm × 45 mm, the height of the second portion of the heat radiation fin is 6.5 mm, and the impeller 104 is
Is an example in which the rotation speed of is set to 5000 rpm. In this case, the arrangement configuration of each heat radiation fin is determined as follows.
Radiating fins F4 located at the center of each side of the heat sink
The angle θ1 between the center line L1 of 6 (F1, F16, F31) and the line L2 extending from the axial center C of the motor and orthogonal to each side is 10 °, and the distance between both side surfaces of each heat radiation fin is set to 10 °. The angle θ2 is set to 5 ° to 6 °. The other heat radiation fins are arranged in order so that the angle θ3 between adjacent heat radiation fins is 6 °. The radiating fins F1 to F60 extend to the end of the heat sink 121 except for the radiating 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 integrally formed with the annular hub 105A. The hub 105A is fitted around the cup-shaped member 106 of the impeller 104.

Based on this embodiment, 45 mm × 45 mm ×
When a cooling device having a size of 18 mm was made, the rotating speed of the impeller 104 was 5000 rpm, and the ambient temperature was 25 ° C., a 10 W heat generation model was placed on the heat sink 121, and the cooling performance was tested. Similar to the example shown in FIG. 3, the temperature rise value of the exothermic model was 17 ° C. Compared to the embodiment shown in FIGS. 1 to 3, in this embodiment, the thickness of the cooling device becomes thicker, but the rotation speed of the impeller 104 can be reduced by 1000 rpm.
There is an advantage that power consumption and noise generation can be reduced.

[0037]

According to the present invention, the air is sucked from the web side and the air is caused to flow through the flow passage formed between the heat radiating fins of the plurality of heat radiating fins. Is eliminated, and there is an advantage that the ventilation efficiency can be increased and the cooling performance can be improved. Further, since the motor is not exposed to the air heated by the heat sink, the temperature inside the motor does not rise more than necessary, and there is an advantage that the life of the motor can be extended.

Further, if the heat radiation fins are extended from the base so as not to exceed the edges of the plurality of blades on the web side, it is possible to suppress the intake of air from the outside of the heat radiation fins (particularly the portion near the casing) to the inside. The generation of noise can be suppressed, and the reduction of cooling efficiency can be suppressed.

Further, if a plurality of ribs for agitating air are provided in a portion facing the surface of the heat sink base, the air between the cup-shaped member of the impeller and the surface of the heat sink base is actively agitated. The cooling performance can be further enhanced.

When the radiating fins are formed so that the two imaginary 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 air flow sent out from the impeller side. The air resistance of the heat radiation fin is reduced, the heat radiation efficiency is increased, and the wind noise is reduced.

Further, if the casing is provided with a connector portion having a plurality of terminals for receiving at least electric power required to drive the motor, the electronic component cooling device can be attached to the electronic equipment without worrying about the wiring cord. Even if the electronic component cooling device fails, there is an advantage that the replacement work can be easily performed.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of an embodiment of an electronic component cooling device of the present invention.

2 is a partially cutaway side view of the embodiment of FIG. 1. FIG.

FIG. 3 is a partially cutaway rear view of the embodiment of FIG.

FIG. 4 is a plan view of another embodiment of the present invention.

5 is a right side view of the embodiment of FIG.

FIG. 6 is a plan view of a heat sink.

7 is a schematic cross-sectional view taken along the line AA of FIG.

FIG. 8 is a partially cutaway sectional view of a conventional heat sink integrated fan.

[Explanation of symbols]

1 Rotor abduction motor 2 rotor 3 stator 4,104 impeller 5,105 blade 6,106 Cup-shaped member 7 Air stirring ribs 9,109 housing 17a to 17c, 117a to 117c Web 18,118 casing 21,121 heat sink 22,122 base 23, F1 to F60 Radiating fins 24,124 pillars 125 connector

Continuation of the front page (56) References JP 62-55000 (JP, A) JP 62-49700 (JP, A) Actually opened 63-113460 (JP, U) Actually opened 5-48397 (JP , U) Actual Kaihei 6-62548 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01L 23/467 H05K 7/20

Claims (3)

(57) [Claims] 1. A rotor abduction motor in which a rotor rotates outside a stator, an impeller having a plurality of blades and fixed to the rotor, a casing surrounding the motor, and a motor for the motor. An electronic component cooling device comprising: a plurality of webs interconnecting a housing and the casing; and a heat sink fixed to the casing, the base having a plurality of heat radiation fins. Is provided in the base so as to surround a part of the impeller, and the plurality of blades of the impeller draw air from the plurality of web sides to blow air toward the plurality of heat radiation fins. The plurality of radiating fins are configured so that the airflow flowing from the rotating impeller is passed through a flow path formed between the radiating fins. Is arranged to direct the said radiation fins, the electronic component cooling apparatus, characterized in that extending from the base to a position not exceeding the said web side edge of said plurality of blades. 2. The impeller is composed of the plurality of blades and a cup-shaped member having the plurality of blades fixed to the outer periphery, and the cup-shaped member of the impeller faces the surface of the base. The electronic component cooling device according to claim 1, wherein a plurality of ribs for air agitation are provided in the portion. 3. 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 rear end edge of the corresponding blade. Electronic component cooling device described.