JP4128055B2 - Heating element cooling device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heating element cooling device for cooling a heating element such as an electronic component.
[0002]
[Prior art]
A base on which a heating element to be cooled is mounted on the back surface, a heat sink composed of a plurality of radiation fins fixed to the base, and air disposed along at least the plurality of radiation fins disposed above the heat sink. 2. Description of the Related Art There is known a heating element cooling device that includes a fan device that flows and promotes heat radiation from a radiation fin. In this heating element cooling device, the heat generated from the heating element is transmitted from the base to the plurality of radiation fins, and the air flowing along the plurality of radiation fins from the fan device takes the heat of the radiation fins to remove the heating element. Cooling.
[0003]
U.S. Pat. No. 6,137,680 and U.S. Pat. No. 5,724,228 disclose an electronic component cooling apparatus for cooling a heat sink having a plurality of heat radiation fins arranged in parallel on a base with a fan device. It is shown. A space through which air flows is formed between the fan case and the heat radiating fins of the heat sink. This space is open in the direction in which the heat dissipating fins extend.
[0004]
U.S. Pat. No. 6,301,110 discloses an electronic component cooling device in which a plurality of slits for partially cutting a plurality of heat dissipating fins extending in parallel and a base are formed.
[0005]
U.S. Pat. No. 5,943,209 discloses an electronic component cooling device having a plurality of radiating fins arranged radially on a base. The fan case has a structure provided with a skirt portion surrounding a space located above the radiating fin.
[0006]
European Patent Application Publication No. EP 0856888A2 has a structure in which a plurality of slits are formed on the outer edge of a base having pin-shaped heat dissipating fins, and the wind sent from the fan device flows through the slits to the lower side of the base. A cooling device is shown.
[0007]
[Problems to be solved by the invention]
However, in recent years, the amount of heat generated by the heating elements has increased with the improvement in performance of heating elements such as electronic components. Therefore, there has been a demand for further enhancing the cooling effect of the heating element cooling device without increasing the size of the heat sink and without increasing the weight of the device.
[0008]
An object of the present invention is to provide a heating element cooling device that can sufficiently enhance the cooling effect of the heating element without increasing the size of the heat sink and without increasing the weight of the device.
[0009]
An object of the present invention is to provide a heating element cooling device having high cooling performance and low noise generation.
[0010]
[Means for Solving the Problems]
The heating element cooling device to be improved in the present invention includes a base on which a heating element to be cooled is mounted on the back surface, a heat sink composed of a plurality of radiation fins fixed to the base, and an upper side of the heat sink And a fan device that promotes heat dissipation from the radiation fins by flowing air along at least a plurality of radiation fins. In the heat sink used in the present invention, the base has a columnar shape. The base is disposed so as to stand in the vertical direction toward the fan device (so that the center of the base and the center of the fan device substantially coincide). The plurality of heat dissipating fins are configured to be positioned outside the outline of the base viewed from the side where the fan device is disposed. If comprised in this way, the cooling air from a fan apparatus will flow along the outer peripheral surface of a base and the outer surface of a radiation fin. Since the base does not exist outside the plurality of heat dissipating fins located on the side opposite to the side where the fan device is located, the presence of the base does not cause a large resistance. The heat from the heating element moves from the heating element side to the fan device side along the columnar base. Therefore, heat is transmitted from the base from each of the heat dissipating fins from a position close to the fan device and from a position far from the fan device, and the cooling performance can be greatly improved as compared with the conventional case.
[0011]
More specifically, the present invention relates to a heat sink composed of a base on which a heating element to be cooled is mounted on the back surface and a plurality of heat radiation fins fixed to the base, and an upper portion of the heat sink. It is intended to be a heating element cooling device including a fan device that is arranged on the side to flow air along at least a plurality of radiating fins constituting the radiating fin group to promote heat dissipation from the radiating fins. The heat sink base has a columnar shape. The plurality of radiating fins are located on the radially outer side of the base from the outer peripheral portion of the base. That is, the plurality of radiating fins are directly or indirectly fixed to the columnar base, and extend along the radial outer side of the base and the height direction of the outer peripheral surface of the base (the direction from the fan device toward the heat sink). Extends in both directions.
[0012]
A preferred fan device includes a motor, a blade mounting portion that is fixed and rotated with respect to the rotor of the motor, and an impeller that includes a plurality of blades provided on a cylindrical outer peripheral portion of the blade mounting portion, A fan case having a cylindrical wind tunnel for rotatably storing an impeller, and a plurality of webs arranged between the fan case and the motor to support the motor, toward the plurality of radiation fins An axial fan device configured to blow air.
[0013]
The fan device is attached to the heat sink so that the rotation center of the rotor and the center of the base are substantially aligned. Further, the outline of the base when the base is viewed from the back side is determined so as to be located inside the outline of the impeller when viewed from the back side (heat sink side) (preferably, inside the outer peripheral portion of the blade mounting portion). . If it does in this way, the magnitude | size of the several radiation fin substantially cooled by the fan apparatus can be enlarged in the possible range. As a result, the cooling device can be further improved.
[0014]
The fan case includes an opposing wall portion that is located outside the wind tunnel portion and faces the heat sink, and a peripheral wall portion that is provided on the opposing wall portion and extends toward the heat sink side. The fan case forms a space through which the air discharged from the impeller passes between the opposing wall portion and the heat sink. However, all or most of the air passing through the space does not pass directly between the radiating fin groups. It is preferable to be configured so as to prevent discharge to the outside of the case. If comprised in this way, since all or most of the air exhaled from the impeller passes between the plurality of radiating fins, the flow rate of the cooling air passing through the radiating fin group can be increased, and the heating element is cooled. The effect can be enhanced.
[0015]
Even in this case, it is preferable that the fan case is formed so that the thickness of the space decreases as the distance from the wind tunnel portion increases. If it does in this way, also in the part of the position away from the wind tunnel part of the several radiation fin, it can prevent that the flow velocity of cooling air falls, and can improve the cooling effect of a heat generating body. Moreover, the turbulent flow of the cooling air can be prevented and the noise of the fan device can be reduced.
[0016]
The radiating fin group includes two or more space dividing radiating fins that extend directly in the radial direction from the outer peripheral portion of the base and divide the surrounding space that surrounds the outer peripheral portion of the base into a plurality of divided spaces; For subdividing a plurality of subdivisions extending outward from each of two adjacent space dividing radiating fins and from the outer peripheral portion of the base located between the two space dividing radiating fins so as to further divide the divided space It can comprise from a radiation fin. In this way, the total surface area of the plurality of heat dissipating fins can be increased compared to the case where a plurality of heat dissipating fins are arranged radially around the base. Therefore, the cooling performance can be improved.
[0017]
The plurality of subdividing radiating fins positioned in one divided space preferably extend substantially in parallel to each other. In this way, the number of subdividing radiating fins can be increased as much as possible.
[0018]
In addition, it is preferable that the plurality of subdividing radiating fins positioned in one divided space be inclined in a direction opposite to the direction in which the impeller rotates. In this way, the cooling effect can be enhanced. The reason for this is not clear, but it is considered that the cooling air efficiently hits the fins.
[0019]
The shape of the two or more space dividing radiating fins is preferably determined so that sufficient heat radiation can be performed through the plurality of subdividing radiating fins coupled to each space dividing radiating fin. Since the temperature of the space dividing radiating fin decreases as the distance from the base increases, the thickness of the space dividing radiating fin may be reduced as the distance from the base increases.
[0020]
Locked portions for locking the fan case can be integrally provided at the front ends of the two or more space dividing radiating fins. The fan case can be integrally provided with two or more locking pieces that are locked to the plurality of locked portions. The fan device is preferably attached to the heat sink by locking the locking piece to the locked portion. If it does in this way, positioning of a heat sink and a fan device can be performed easily, and both can be fixed.
[0021]
In order to specifically configure such a locking structure, for example, the following is performed. First, two space-dividing radiating fins are arranged at two positions 180 degrees apart from each other in the circumferential direction of the base. Further, two heat dissipating fins for space division are arranged at two other positions separated from each other by 180 ° in the circumferential direction of the base. Then, the four space-dividing radiating fins are arranged so that the angles between the two space-dividing radiating fins surrounding the two divided spaces opposed to each other in the radial direction of the base are equal. In addition, a locked portion for locking the fan case is integrally provided at the front end portion of the four space dividing radiating fins. The fan case is integrally provided with four locking pieces that are locked to the four locked portions. The fan device is attached to the heat sink by locking the four locking pieces to the four locked portions. If it does in this way, the latching structure which can ensure positioning of a heat sink and a fan apparatus using the four space-dividing radiating fins can be constituted simply.
[0022]
In order to form and maintain the space located between the opposing wall portion and the plurality of radiating fin groups, for example, a plurality of spacer means may be disposed on the opposing wall portion.
[0023]
The base is preferably formed of a material having higher thermal conductivity than the radiating fin group. In this way, it is possible to reduce the weight of the heat sink at a low cost and to increase the thermal conductivity of the entire heat sink. In this case, for example, the base is formed integrally with the radiating fin group and has a hollow inside, and the base is used to form the radiating fin group and the hollow portion arranged in the cavity so as to be able to transfer heat. It is comprised from the high thermal conductivity body whose heat conductivity is higher than material. If it does in this way, heat can be efficiently transmitted to a radiation fin through a base. In this case, the cavity can be formed from a through hole that opens in the vertical direction. The high thermal conductivity body may be configured to completely fill a space of 80% or more and 90% or less from the lower surface to the upper surface in the through hole.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
1A to 1D are a plan view, a right side view, a front view, and a bottom view of a heating element cooling device according to a first embodiment of the present invention applied to an electronic component cooling device. Fig. 2 conceptually shows a cross-sectional view of the electronic component cooling device of Fig. 1. As shown in these drawings, the electronic component cooling device 1 of this example includes a heat sink 3 and an axial fan device 5. As shown in detail in FIGS. 3A to 3D, the heat sink 3 includes a base 7 and a radiating fin group 9 fixed to the base 7. The base 7 has a cylindrical hollow portion 7a having a cavity inside, and a high thermal conductivity higher than that of a material used for forming the hollow portion 7a by being disposed in the cavity so as to be able to conduct heat. It is comprised from the rate body 7b. The high thermal conductivity body 7b is made of copper having a higher thermal conductivity than the material (aluminum) of the radiating fin group 9 and the hollow portion 7a, and has a substantially cylindrical shape. As shown in FIG. 2, the diameter dimension of the base 7 (the outer dimension of the hollow portion 7a) is equal to or smaller than the outer diameter dimension of the impeller 23 of the axial fan device 5 described later. In this example, the high thermal conductivity body 7b completely fills a space of 80% or more and 90% or less from the lower surface to the upper surface of the hollow portion 7a. A heat radiating fin group 9 is fixed to the outer periphery of the base 7. On the back surface of the base 7 (the surface opposite to the side on which the axial fan device 5 is located, that is, the bottom surface 7c), a heating element E made of electronic components to be cooled is mounted. In this heat sink 3, all of the plurality of heat radiating fins (13 </ b> A to 13 </ b> D, 15) of the heat radiating fin group 9 are the outline of the base 7 (the outline of the hollow portion 7 a) as viewed from the side where the axial fan device 5 is disposed. It is comprised so that it may be located outside beyond.
[0025]
The radiating fin group 9 includes a plurality of space-dividing radiating fins 13A to 13D fixed integrally to the cylindrical hollow portion 7a, and a plurality of radiating fin groups 9 fixed to the hollow portion 7a and the space-dividing radiating fins 13A to 13D. The subdividing heat dissipating fins 15. The structure of the radiating fin group 9 will be described with reference to FIGS. 1D and 3A to 3D. The four space dividing radiating fins 13A to 13D are plates fixed to the hollow portion 7a. A fin-shaped fin body 13a, a first plate-like portion 13b fixed to the tip of the fin body 13a, and a second plate-like portion 13c fixed to the tip of the first plate-like portion 13b. Yes. The fin body 13a gradually decreases in thickness (dimension along the circumferential direction of the hollow portion 7a) from the base portion integrally fixed to the hollow portion 7a toward the distal end portion (toward the radially outer side of the hollow portion 7a). It has a shape. This shape is determined so that sufficient heat radiation can be performed through the plurality of subdividing heat radiation fins 15. The first plate-like portion 13b and the second plate-like portion 13c are arranged so that the cross-sectional shape (the shape seen from the back side of the heat sink 3) is L-shaped. The second plate-like portion 13c of the space-dividing radiating fin 13A and the second plate-like portion 13c of the space-dividing radiating fin 13D are parallel, and the second plate-like portion of the space-dividing radiating fin 13B. The four space-dividing radiating fins 13A to 13D are arranged so that 13c and the second plate-like portion 13c of the space-dividing radiating fin 13C are parallel to each other. As shown in FIG. 1C and FIGS. 3C and 3D, a cutout portion 13d is formed in the second plate-like portion 13c. The notch 13d constitutes a locked portion for locking a locking piece 35 of the fan case 25 described later.
[0026]
The four space dividing radiating fins 13A to 13D extend radially from the hollow portion 7a in the radial direction, and divide the surrounding space surrounding the outer periphery of the base 7 into four divided spaces S1 to S4. More specifically, two space-dividing radiating fins 13 </ b> A and 13 </ b> C are arranged at two positions 180 degrees apart from each other in the circumferential direction of the base 7. Further, two space-dividing heat radiation fins 13B and 13D are arranged at two other positions that are 180 ° apart from each other in the circumferential direction of the base 7. The angle θ1 between the two space-dividing heat radiation fins 13A and 13B surrounding the two divided spaces S1 and S3 facing each other in the radial direction of the base 7 and the angle between the two space-dividing heat radiation fins 13C and 13D. The four space dividing radiating fins 13A to 13D are arranged so that θ2 is equal.
[0027]
The plurality of subdividing radiating fins 15 are positioned in the divided spaces S1 to S4, and further divide the divided spaces S1 to S4. The plurality of subdividing heat radiation fins 15... Located between two adjacent space division heat radiation fins (13A, 13B) (13B, 13C) (13C, 13D) (13D, 13A) are two spaces. Each of the hollow portion 7a located between the dividing heat dissipating fins and the two space dividing heat dissipating fins extend outward. The plurality of subdividing radiating fins 15 positioned in each of the divided spaces S1 to S4 extend outward substantially parallel to each other.
[0028]
As shown in FIG. 1 (A), the axial fan device 5 is provided with a motor 17, seven blades 19..., And a cup-shaped blade mounting portion 21 (FIG. 2), and is rotated by the motor 17. 23, a fan case 25, and three webs 27A to 27C. Then, the axial fan device 5 operates to suck air from the webs 27 </ b> A to 27 </ b> C and blow the air toward the radiating fin group 9. In this example, the fan case 25, the housing 17a of the motor 17 and the webs 27A to 27C are integrally formed of a molding material mainly made of a synthetic resin material.
[0029]
As shown in FIG. 2, the blade mounting portion 21 is configured to be fixed to a rotor (not shown) of the motor 17 and rotationally driven. The axial fan device 5 is attached to the heat sink 3 so that the rotation center C of the rotor and the center C ′ of the base 7 substantially coincide with each other. In this example, the outer diameter dimension of the base 7 (hollow part 7a) is set smaller than the outer diameter dimension of the blade mounting part 21.
[0030]
As shown in detail in FIGS. 1A to 1D, the fan case 25 has a cylindrical wind tunnel portion 29 that rotatably accommodates the impeller 23, and is positioned outside the wind tunnel portion 29 and faces the heat sink 3. Counter wall 31, a peripheral wall 33 provided on the counter wall 31 and extending toward the base 7, and four locking pieces 35 provided on the counter wall 31. As shown in FIGS. 1B and 1C, the wind tunnel portion 29 is configured such that a part of the blades 19 of the impeller 23 is exposed when viewed from the width direction and the lateral direction perpendicular to the width direction. Has been. As shown in FIG. 2, the opposing wall portion 31 includes two spacer means 34, 34 that are located between the opposing wall portion 31 and the radiating fin group 9 to form and maintain a space 37 therebetween. Has been placed. The number of spacer means is arbitrary.
[0031]
As shown in FIGS. 1C and 1D, the peripheral wall 33 is a first pair of laterally opposed portions of the subdividing heat radiation fins 15 in the two divided spaces S1 and S3 described above. Side wall portions 33A, 33A, and a second pair of side wall portions 33B, 33B facing the subdivision heat radiation fins 15 in the two divided spaces S2, S4 in the lateral direction. The first pair of side wall portions 33 </ b> A and 33 </ b> A includes three side wall constituting portions 38 a, 38 b, and 38 c divided by two slits 36. The two side wall constituting portions 38a and 38c on both sides are provided with hooks 38d [FIG. 1 (B)] for locking attachment brackets (not shown). The slit 36 allows the side wall components 38a and 38c to incline inward when receiving an external force. As shown in FIG. 2, the first pair of side wall portions 33A and 33A and the second pair of side wall portions 33B and 33B are air (arrows) discharged from the impeller 23 between the opposing wall portion 31 and the heat sink 3. F) forms a space 37 through which all or most of the air (arrow F) passing through the space 37 is discharged directly to the outside of the fan case 25 without passing between the plurality of subdividing heat radiation fins 15. It arrange | positions so that the side of the space 37 may be enclosed so that it may be prevented.
[0032]
As shown in FIG. 1 (C), the four locking pieces 35... Extend from the opposing wall portion 31 toward the heat sink 3 and toward the base 7 from the edge of the main body portion 31a on the heat sink 3 side. And an engaging protrusion 31b that protrudes. A part of each of the four locking pieces 35 is provided in each locking piece 35 in a notch 13d provided in the second plate-like portion 13c at the tip of each of the four space dividing radiating fins 13A to 13D. The engagement protrusion (or hook) 31b is elastically engaged (snap-in engagement). In this way, the axial fan device 5 is detachably attached to the heat sink 3.
[0033]
As shown in FIG. 1A, the webs 27 </ b> A to 27 </ b> C are disposed between the fan case 25 and the motor 17 and support the motor 17. One of the webs 27 </ b> A to 27 </ b> C has a conductive wire 39 for supplying electric power to the motor 17. Referring to FIG. 1A, the web 27 </ b> A to 27 </ b> C includes a motor-side joint 27 a that joins the housing 17 a of the motor 17 and a wind-tunnel-side joint 27 b that joins the wind tunnel 29. Have. Then, the wind tunnel side joint portion 27b is rotated in the direction of rotation of the impeller 23 (arrow) from the intersection C1 intersecting the wind tunnel portion 29 of the virtual line L1 extending the line connecting the center point 17b of the motor 17 and the motor side joint portion 27a. The webs 27A to 27C are arranged to be inclined with respect to the virtual line L1 so as to be positioned on the A) side.
[0034]
According to the heating element cooling device of this example, as shown in FIG. 2, the cooling air from the axial fan device 5 flows along the outer peripheral surface of the base 7 and the outer surface of the radiating fin group 9. And since the base 7 does not exist in the outer side of the several radiation fin located in the opposite side to the side in which the axial-flow fan apparatus 5 is located, presence of the base 7 does not become a big resistance. The heat from the heating element E moves from the heating element E side to the axial fan device 5 side along the columnar base 7. For this reason, heat is transmitted from the base 7 to each radiating fin from a position close to or far from the axial fan device 5, and the cooling performance can be greatly improved as compared with the conventional case. Further, in this example, the first pair of side wall portions 33A, 33A and the second pair of side wall portions 33B, 33B are configured such that all or most of the air passing through the space 37 has a plurality of subdividing heat radiation fins 15. Since it is arranged so as to surround the side of the space 37 so as to prevent the air from being directly discharged to the outside of the fan case 25 without passing through the space, the air discharged from the impeller 23 is entirely or large. The portion passes between the radiating fin groups 9. Therefore, the flow rate of the cooling air passing between the radiating fin groups 9 can be increased, and the cooling effect of the heating element E can be further enhanced.
[0035]
4A to 4D are a plan view, a right side view, a front view, and a bottom view of the heat sink 103 used in the heating element cooling device according to the second embodiment of the present invention. The heat sink of the heating element cooling device of this example has the same structure as the heat sink shown in FIG. 3 except for the plurality of subdivision heat radiation fins 115. The members to be removed are denoted by the reference numerals in FIG. 3 plus 100, and the description thereof is omitted. In this example, the plurality of subdividing radiating fins 115 located in one divided space of the divided spaces S1 to S4 are inclined in the direction opposite to the direction in which the impeller rotates (arrow B). In the heating element cooling device of this example, the cooling effect can be enhanced.
[0036]
【The invention's effect】
According to the present invention, the radiating fins are arranged so that some or all of the radiating fins are located outside the base. Therefore, the presence of the base does not become a great resistance to the air flow. Therefore, the cooling performance can be improved as compared with the case where a base is present as a whole corresponding to the radiation fins. This effect becomes more prominent as the amount of air blown by the fan device increases.
[Brief description of the drawings]
FIGS. 1A to 1D are a plan view, a right side view, a front view, and a bottom view of a heating element cooling device according to a first embodiment of the present invention.
FIG. 2 is a diagram conceptually showing a cross section of the electronic component cooling apparatus shown in FIG.
FIGS. 3A to 3D are a plan view, a right side view, a front view, and a bottom view of a heat sink used in the electronic component cooling apparatus shown in FIG.
4A to 4D are a plan view, a right side view, a front view, and a bottom view of a heat sink used in a heating element cooling apparatus according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electronic component cooling device 3 Heat sink 5 Axial fan device 7 Base 9 Radiation fin group 11 Outer peripheral part 13A-13D Radiation fin 13d for space division Notch part (locked part)
15, 115 Subdividing radiation fins S1 to S4 Divided space 17 Motor 19 Blade 21 Blade mounting portion 23 Impeller 25 Fan case 27A to 27C Web 29 Wind tunnel portion 31 Opposing wall portion 33 Peripheral wall portion 35 Locking piece 37 Space

Claims (7)

A heat sink comprising a base on which a heating element to be cooled on the back surface is mounted and a plurality of heat dissipating fins and fixed to the base;
A heating element cooling device comprising: a fan device that is arranged above the heat sink and that causes air to flow along the plurality of radiation fins constituting at least the radiation fin group to promote heat radiation from the radiation fins. There,
The base of the heat sink has a columnar shape,
The plurality of heat dissipating fins are located radially outside the base from the outer periphery of the base,
The fan device includes a motor, a blade mounting portion that is fixed and rotated with respect to a rotor of the motor, and an impeller that includes a plurality of blades provided on a cylindrical outer peripheral portion of the blade mounting portion. A fan case having a cylindrical wind tunnel for rotatably storing the impeller, and a plurality of webs arranged between the fan case and the motor to support the motor, An axial fan device configured to blow air toward the heat dissipating fins,
Said fan unit to the center and GaSei case of the rotation center and the base of the rotor is attached to the heat sink,
The outline of the base when the base is viewed from the back side is determined to be located inside the outline of the impeller when the fan device is viewed from the back side ,
The fan case includes an opposing wall portion that is located outside the wind tunnel portion and faces the heat sink, and a peripheral wall portion that is provided on the opposing wall portion and extends toward the heat sink side.
The fan case forms a space through which the air discharged from the impeller passes between the opposing wall portion and the heat sink. However, the fan case directly passes through the space without passing through the radiating fin group. Configured to prevent discharge to the outside of the
The plurality of heat dissipating fins constituting the heat dissipating fin group are four spaces that extend in the radial direction directly from the outer peripheral portion of the base and divide the surrounding space surrounding the outer peripheral portion of the base into a plurality of divided spaces. Each of the space radiating fins and the space radiating fins adjacent to each other and between the space radiating fins adjacent to each other so as to divide the space further into a smaller space. Consisting of a plurality of subdividing heat dissipating fins extending outward from the outer peripheral portion of the base,
The two heat dissipating fins for space division are arranged at two positions 180 degrees apart from each other in the circumferential direction of the base,
Further, the two heat dissipating fins for space division are arranged at two other positions separated from each other by 180 ° in the circumferential direction of the base,
The four space-dividing radiating fins are arranged so that the angle between the two space-dividing radiating fins surrounding the two divided spaces opposed to each other in the radial direction of the base is equal.
Locked portions for locking the fan case are integrally provided at the front end portions of the four space dividing radiating fins,
The fan case is integrally provided with four locking pieces locked to the four locked portions,
The heating element cooling device, wherein the fan device is attached to the heat sink by locking the four locking pieces to the four locked portions . Heating element cooling device according to claim 1, the thickness of the space is the fan case so as to be smaller as the distance from the wind tunnel portion is formed. 2. The heating element cooling device according to claim 1 , wherein the plurality of subdividing radiating fins positioned in one of the divided spaces extend substantially parallel to each other. 2. The heating element cooling device according to claim 1 , wherein the plurality of subdividing radiating fins positioned in one of the divided spaces are inclined in a direction opposite to a direction in which the impeller rotates. 2. The heating element cooling device according to claim 1 , wherein a plurality of spacer means is disposed on the opposing wall portion between the opposing wall portion and the radiating fin group to form and maintain the space. The base is formed integrally with the radiating fin group and has a hollow portion therein, and is disposed in the cavity so as to be able to transfer heat to the hollow portion, thereby forming the radiating fin group and the hollow portion. The heating element cooling device according to claim 1 , comprising a high thermal conductivity body having a higher thermal conductivity than the material used for the heating element. The cavity consists of a through hole that opens in the vertical direction,
The heating element cooling device according to claim 6, wherein the high thermal conductivity body completely fills a space of 80% or more and 90% or less from the lower surface to the upper surface in the through hole.

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