JP3770958B2 - Electronic component cooling system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic component cooling device that is housed and used inside a housing case of an electronic device.
[0002]
[Prior art]
Japanese Patent Application Laid-Open Nos. Hei 2-231940 and Hei 2-231941 disclose a blower called a radial flow blower that uses an axial flow blower to flow wind in a radial direction perpendicular to the axial direction. In the first place, an axial blower has an impeller having a plurality of blades formed so as to suck air from one axial direction of the rotation shaft of the motor and flow the sucked air in the other axial direction. The structure is fixed to the rotating shaft, and at least the impeller is disposed in a cylindrical cavity defined by the peripheral wall portion of the casing. The axial blower has a characteristic that the pressure is small but the air volume is large. Therefore, the above-described radial blower was developed for the purpose of obtaining a radial blower having a small thickness, a larger air volume than a cross flow fan or a sirocco fan, and less noise than a sirocco fan.
[0003]
This conventional radial blower has a side discharge port formed by closing one end of a cavity in which an impeller is accommodated with a closed wall portion and removing a part of the peripheral wall portion of the casing in the axial direction. . The side discharge port extends completely from one end of the cavity to the other end. That is, the impeller blade is completely exposed from the side discharge port.
[0004]
U.S. Pat. No. 5,288,203 and JP-A-7-111302.GazetteDiscloses an electronic component cooling apparatus having a structure for cooling a heat sink to which an electronic element such as a CPU is attached using an axial fan.
[0005]
[Problems to be solved by the invention]
When an electronic component cooling device was made using the above-mentioned conventional radial flow fan using an axial flow fan and actually tested, the amount of air exhausted from the side outlet (air flow rate) was higher than expected. It turns out that there are few.
[0006]
Further, it has been found that when an electronic component cooling device using a conventional radial fan is stored in a storage case of a thin electronic device, the air flow rate is extremely reduced or the air flow rate is substantially zero.
[0007]
An object of the present invention is to provide an electronic component cooling device having a larger air flow than the conventional one.
[0008]
Another object of the present invention is to provide an electronic component cooling device capable of ensuring a predetermined air flow rate even when stored in a storage case of a thin electronic device.
[0009]
Another object of the present invention is to provide an electronic component cooling device capable of reliably cooling an electronic device that generates heat even when a space in a storage case of the electronic device is small.
[0010]
[Means for Solving the Problems]
An electronic component cooling device of the present invention includes a motor having a rotor and a stator, an impeller fixed to the rotor having a plurality of blades for sucking air from one of the axial directions of the rotation shaft of the motor, And a casing having a cavity in which the impeller is accommodated.
[0011]
In the present invention, there is provided spacer means that protrudes in one direction to form a space that allows air to be sucked into the cavity from the radial direction of the rotating shaft, and the spacer means includes a casing for the motor housing. It is comprised by the leg part of the some web supported with respect to.
In another invention, the casing is positioned on the other side in the axial direction of the impeller so as to define the cavity, and is opposed to the impeller and faces the other direction. A second wall for preventing the air from flowing, and a discharge port for discharging the air sucked through the cavity and flowing along the second wall. A motor housing is supported at one end of the first wall by way of a plurality of webs arranged at intervals in the circumferential direction. Spacer means is formed which protrudes in the direction of and forms a space allowing air to be sucked into the cavity from the radial direction of the rotating shaft.
In yet another invention, the casing is positioned on the other side in the axial direction of the impeller so as to define a cavity, facing the impeller, and facing the other direction. A second wall that prevents air from flowing; A discharge port for discharging air sucked through the cavity and flowing along the second wall portion. And the 2nd wall part of a casing is comprised by the to-be-cooled wall part of the electronic device which should be cooled, and is arrange | positioned at the edge part of the one direction of the 1st wall part at intervals in the circumferential direction. The motor housing is supported through a plurality of webs. Further, the first wall portion surrounds the impeller over the entire circumference so as to suppress the occurrence of an air sneak phenomenon in which much of the air exhausted from the discharge port is immediately sucked from the opening located in one direction of the cavity. A spacer having a surrounding portion and a plurality of web legs or housings projecting in one direction to form a space allowing air to be sucked into the cavity from the radial direction of the rotating shaft Configure the means.
According to the invention of this application, the spacer means for securing a space allowing air to be sucked into the cavity is constituted by a part (a plurality of webs and housings) of the electronic component cooling device. Without preparing as a separate member, a space for sucking air into the cavity can be ensured.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show an electronic component cooling apparatus.Reference exampleIt is the perspective view and sectional drawing of these. In FIG. 2, the arrows indicate the direction in which the wind flows. In these drawings, 1 is a casing which will be described in detail later, and 2 is a motor having a rotor 21 and a stator 22. As the motor 2, a two-phase DC brushless DC motor is used. As shown in FIG. 2, the stator 22 of the motor 2 is configured by winding an exciting winding 24 around an iron core 23, and is fixed to a cylindrical boss portion 12 a provided on a closing wall portion 12 described later of the casing 1. Has been. A bearing holder 25 is fitted to the boss portion 12a, and a pair of bearings 26 are accommodated in the bearing holder 25 with an interval in the axial direction. One end of the rotating shaft 27 is rotatably supported by a pair of bearings 26, and the other end of the rotating shaft 27 is fitted in a fitting hole formed in the bottom wall portion 28 a of the cup-shaped member 28. A circuit board 29 on which electronic components constituting a drive circuit are mounted is also fixed to the bearing holder 25. On the inner peripheral surface of the peripheral wall portion 28b of the cup-shaped member 28, a plurality of magnetic poles made of permanent magnets PM are fixed. The rotor 21 includes a rotating shaft 27, a cup-shaped member 28, and a permanent magnet PM.
[0013]
3 sucks air from one axial direction of the rotating shaft 27 of the motor 2 (hereinafter referred to as a suction direction), and flows the sucked air mainly in the other axial direction (hereinafter referred to as a discharge direction). The impeller has a plurality of blades 31 formed as described above and is fixed to the rotor 21. The impeller 3 is configured by integrally forming a ring portion 30 and a blade 31 that are fitted to the peripheral wall portion 28 b of the cup-shaped member 28 of the rotor 21. The plurality of blades 31 provided in the impeller 3 are determined in shape and mounting angle so that the sucked air can flow in the radial direction as much as possible.
[0014]
The casing 1 will be specifically described. The casing 1 is integrally formed using a synthetic resin such as polybutylene terephthalate. The casing 1 has a cylindrical cavity 4 in which the motor 2 and the impeller 3 are housed. The casing 1 also has a peripheral wall portion 11 that defines or forms the cavity 4 and a closing wall portion 12 that closes the end portion of the cavity 4 located on the other axial direction, that is, the discharge direction side. In this example, the peripheral wall portion 11 constitutes a first wall portion surrounding the impeller 3 so as to define the cavity 4, and the blocking wall portion 12 prevents the air from flowing in the other direction. Part.
[0015]
The peripheral wall part 11 is comprised from four side wall parts 11a-11d comprised so that the outline shape seen from the axial direction may make a substantially rectangular shape. BookreferenceIn the example, a cylindrical wall portion 13 surrounding the outer periphery of the impeller and a frame body portion 14 located outside the cylindrical wall portion are formed by these four side wall portions 11a to 11d. BookreferenceIn the example, a part of the cylindrical wall part 13 also serves as a part of the frame part 14. And in one side wall part 11a of four side wall parts 11a-11d, the surrounding part 15 which surrounds the impeller 3 over the perimeter is left in the position near the edge part by the side of a suction direction, and the edge by the side of a discharge direction is left. One side discharge port 5 that discharges the air sucked through the inside of the cavity 4 from the suction side opening 41 of the cavity 4 in the radial direction of the rotary shaft 27 is formed at a position near the portion. In other words, the peripheral wall portion 11 including the cylindrical wall portion 13 in which the impeller 3 is accommodated communicates with the inside of the cylindrical wall portion 13 at a position near the end in the discharge direction, and enters the inside of the cylindrical wall portion 13. A side discharge port 5 for discharging the sucked air in the radial direction of the rotary shaft 27 is formed.
[0016]
In this example, in order to increase the amount of air blown from the side discharge port 5, most of the air discharged from the side discharge port 5 is located on the suction direction side of the cavity 4 (or the cylindrical wall portion 13).Suction side openingThe shape and dimensions of the side discharge port 5 are determined so that the air circulation phenomenon that is immediately sucked from the nozzle 41 does not occur. Specifically, the dimension L1 in the axial direction of the wall portion of the side wall portion 11a is determined so that the blade 31 of the impeller 3 is not completely exposed from the side discharge port 5. Although this dimension L1 varies depending on the size and air volume of the blower, it is preferable to set this dimension L to about 5 mm or more in a blower of 40 mm × 40 mm × 16 mm (thickness) and rotating at 5,000 rpm. The dimension L2 in the axial direction of the side discharge port 5 is preferably set to a dimension in which the blade 31 is exposed in the axial direction by about 3 mm.
[0017]
Also bookreferenceIn the example, the dimension L1 in the axial direction of the surrounding portion 15 of the peripheral wall portion 11 is determined as follows. That is, even when the suction side opening 41 of the cavity 4 is blocked by a gas-permeable member such as a mesh plate or a perforated plate, the dimension between the suction direction side end of the blade 31 and the suction side opening 41 is sufficient. L3 is determined to have a size that establishes a suction pressure capable of sucking sufficient air into the cavity 4. In other words, when the impeller 3 rotates, there is a pressure difference in which the wind flows in the space formed between the suction direction side end of the blade 31 and the suction side opening 41. It is a dimension to do. If the dimension L1 is set in this way, for example, even when the suction side opening 41 is attached in close contact with the wall portion of the storage case of the electronic device, a net or a plurality of through holes or the like is formed on the wall portion of the storage case. If the ventilation part is formed, the air can be blown into the inside of the storage case of the electronic device without any trouble. When used in a state where the suction side opening of the cavity 4 is not closed, the dimension L3 is set in the space formed between the suction direction side end of the blade 31 and the suction side opening 41. It is not necessary to have dimensions that generate a flowing pressure difference.
[0018]
When the amount of air blown in the axial direction by an ordinary axial blower is 1,referenceThe amount of air that can be blown in the radial direction by the cooling device of the example is about 0.33. By the way, the sirocco fan made for the purpose of blowing air in the radial direction has an air volume of about 0.2.referenceRequires more than 15% more power than the example cooling device.
[0019]
In FIG. 1, through holes 6 formed in the four corners of the casing 1 are screw insertion holes for inserting mounting screws.
[0020]
3 and 4 areotherCooling systemreferenceIt is the perspective view and sectional drawing of an example. As shown in FIG. 1 and FIG.referenceThe difference from the example is that spacer means extending in the suction direction (the direction away from the casing 1) is provided at the end or end face of the casing 1 in the suction direction. Other configurations are substantially the same as those in the example of FIGS. 1 and 2, and thus the same reference numerals as those in FIGS. BookreferenceAn example is a cooling device suitable for being placed inside a thin storage case of an electronic device such as a microcomputer. When the thickness of the storage case is reduced, the end face in one direction of the blower device (the opening in one direction of the cavity 4, that is, the suction side opening 41) and the circuit stored in the inner wall surface of the storage case or in the storage case. The distance between the opposing member such as the substrate is shortened. If this distance is too short, the air cannot be blown. In the blower, the blades rotate to lower the atmospheric pressure, and the wind flows from the surrounding high atmospheric pressure portion to the low atmospheric pressure portion. However, when the distance to the opposing member is shortened, it is assumed that the high pressure portion and the low pressure portion cannot be separated, and thus the wind does not flow. That is, it is presumed that the opposing member becomes a barrier between a portion having a low atmospheric pressure and a portion having a high atmospheric pressure (a central portion of the impeller), so that the wind does not move. However, a user who uses this type of cooling device for an electronic device does not know how much this distance should be. BookreferenceIn the example, four protrusions or pillars 7 constituting the spacer means extending in the direction away from the casing 1 are provided at the end of the casing 1 on the suction direction side. These four pillars 7 are formed integrally with the casing 1, and through holes 6 used as screw insertion holes are formed at the respective centers.
[0021]
The length (protrusion dimension) of the pillars 7 in the axial direction is such that the cavity 4 has a length in the cavity 4 even when an opposing member that is entirely opposed to the cavity 4 is disposed on the end or end surface of the pillar 7 in the suction direction. It is set to a size that establishes a suction pressure capable of sucking sufficient air. In other words, this dimension is a dimension that generates a pressure difference in which wind flows in the space formed by the pillars 7 when the impeller rotates. If a spacer means composed of such pillars 7 is provided, the thickness of the book can be stored in the storage case.referenceEven if the blower of the example is installed, in order to secure the space necessary for the pillars 7 ... to establish the suction pressure, the blower can be easily incorporated into the storage case of the electronic device without any special design. it can.
[0022]
BookreferenceIn the example, the four pillars 7 arranged at each corner of the casing 1 ensure a predetermined space. Further, since through holes 6 for inserting mounting screws are formed in these four pillars 7..., It is easy to mount the cooling device, and a space for forming spacer means is particularly provided in the casing. There is no need, and the casing can be made compact.
[0023]
The thickness of a storage case of a notebook type microcomputer that is currently on the market tends to become thinner. Therefore, in the future, it is expected that the thickness (axial dimension) of the cooling device housed in the housing case will need to be 20 mm or less. However, with a cross flow fan or a sirocco fan, it is extremely difficult to obtain a certain amount of air flow even if the thickness is reduced. These problems can be solved by using the cooling device of the present invention.
[0024]
FIG. 5 is shown in FIGS.Other referencesIt is the schematic which shows the example of a storage in the case of using the cooling device of an example as an electronic component cooling device for cooling the microprocessor accommodated in the storage case of the notebook type microcomputer (electronic device). In FIG. 5, W is a wall portion of the storage case of the electronic device, and MPU is a microprocessor directly mounted on the circuit board CB. BookreferenceIn the example, a cooling device is mounted on the circuit board CB adjacent to the microprocessor MPU. In this example, the closed wall portion 12 of the casing 1 of the cooling device is placed on the circuit board CB. The side discharge port 5 is open toward the microprocessor MPU. When the cooling device is arranged in this way, the microprocessor MPU can be directly cooled.
[0025]
6 is the same as FIG. 1 and FIG.referenceThe example cooling device is secured to a heat sink H for cooling the microprocessor MPU.referenceThe schematic structure of an example is shown. In FIG. 6, S is a socket into which the microprocessor MPU is mounted. The cooling device is provided on the heat sink H.Mounting bracket8 is screwed using a through hole 6 provided in the casing 1. thisreferenceIn the example, the side discharge port 5 opens toward the heat sink H that cools the microprocessor MPU. When the cooling device is arranged in this manner, the microprocessor MPU can be indirectly cooled by cooling the heat sink H.
[0026]
FIG. 7 shows another example of the type of cooling device shown in FIGS.referenceFig. 3 shows an example where the exemplary cooling device is used to cool a microprocessor MPU. In this cooling device, the inner wall surface of the closing wall portion 12 ′ of the casing 1 ′ is inclined toward the side discharge port 5 (inclination so that the thickness of the closing wall portion 12 ′ becomes thinner toward the side discharge port 5). is doing. If it does in this way, the wind which hit | blocked obstruction | occlusion wall part 12 'can be smoothly guide | induced to the side discharge outlet 5. FIG. BookreferenceIn the example, the blower is fixed to the circuit board CB with the pillars 7... Constituting the spacer means provided on the casing 1 ′ of the blower being in contact with the circuit board CB. An electronic component EP such as a transistor is disposed on the portion of the circuit board CB that faces the blower. BookreferenceAccording to the example, when the cooling device is activated, both the electronic component EP such as the transistor and the heat sink H can be simultaneously cooled.
[0027]
FIG. 8 shows still another type of cooling device shown in FIGS.referenceFig. 3 shows an example where the exemplary cooling device is used to cool a microprocessor MPU. In this blower, two side discharge ports 5a and 5b are formed in the casing 1 ''. These two side discharge ports 5a and 5b open toward two heat sinks H for cooling the two microprocessors MPU arranged on the circuit board CB. When a plurality of side discharge ports 5a and 5b are formed in a plurality of side wall portions of the casing 1 ″ as described above, a plurality of electronic components can be cooled simultaneously.
[0028]
5 to 8referenceIn the example, the cooling device is mounted on the circuit board CB, but the blower may be fixed to the wall W of the storage case.
[0029]
5 to 8referenceIn the example, the cooling device is used to blow air directly to the electronic components inside the storage case, but the purpose is to exhaust the air inside the storage case to the outside of the storage case, Of course, the blower of the present invention may be used for the purpose of incorporating into the interior.
[0030]
According to each of the above examples, the side of the peripheral wall portion of the casing near the other end portion in the axial direction is left so as to leave the surrounding portion surrounding the impeller over the entire circumference at a position near the end portion in one axial direction. In order to form the side discharge port, the air exhausted from the side discharge port is immediately discharged from the cavity or the cylindrical wall portion.Suction side openingTo be sucked in. Therefore, it is possible to suppress the occurrence of the air circulation phenomenon, and in the case where the side discharge port is formed in the peripheral wall portion of the casing, it is possible to obtain a sufficient air flow rate.
[0031]
If the casing is provided with spacer means, a special design is required to ensure the space necessary for the spacer means to establish the suction pressure even when the blower is placed in the storage case of a thin electronic device. And there is an advantage that the blower can be easily incorporated into the storage case of the electronic device.
[0032]
9 to 11 show the present invention.The fruitThe top view of an example of embodiment, sectional drawing, and the top view of the heat sink to be used are shown. The cooling apparatus shown in FIGS. 1 to 4 is greatly different in the motor mounting structure, the casing structure, and the spacer means structure. The other points are substantially the same as those of the cooling device shown in FIGS.
[0033]
In FIG. 10, 101 is a casing that will be described in detail later, and 102 is a two-phase DC brushless DC motor having a rotor 121 and a stator 122. Reference numeral 123 is an iron core, 124 is an excitation winding, 125 is a housing, 125a is a bearing holder provided in the housing, and 126 is a pair of bearings arranged at intervals in the axial direction. Reference numeral 127 denotes a rotating shaft, and the other end of the rotating shaft 127 is fitted in a fitting hole formed in the bottom wall portion 128a of the cup-shaped member 128. Also fixed to the housing 125 is a circuit board 129 on which electronic components constituting a drive circuit are mounted. On the inner peripheral surface of the peripheral wall portion 128b of the cup-shaped member 128, a plurality of magnetic poles made of permanent magnets PM are fixed. The rotor 121 includes a rotating shaft 127, a cup-shaped member 128, and a permanent magnet PM.
[0034]
Reference numeral 103 denotes an impeller fixed to the rotor 121 having a plurality of blades 131 for sucking air from one axial direction (hereinafter referred to as a suction direction) of the rotating shaft 127 of the motor 102. The impeller 103 is configured by integrally forming a ring portion 130 and a plurality of blades 131... Fitted into the peripheral wall portion 128 b of the cup-shaped member 128 of the rotor 121. The housing 125 of the motor 101 is fixed to the casing 101 via three webs 108a to 108c arranged at intervals of 120 degrees in the circumferential direction. In particular, a connector conductor 109 for cord connection is fixed to the web 108a. Each of the webs 108a to 108c includes a leg portion 108d extending in parallel to the axial direction and a connecting portion 108e extending in the radial direction.
[0035]
Next, the casing 101 will be described in detail. The casing 101 is composed of a first casing half 111 and a heat sink 112 formed integrally with the housing 125 and the webs 108a to 108c using a synthetic resin such as polybutylene terephthalate. The second half of the casing is combined and configured. The casing half 111 is orthogonal to the cylindrical wall from the cylindrical wall 111a surrounding the outer periphery of the impeller 103 and the base of the cylindrical wall 111a so as to define a part of the cavity 104 in which the impeller 103 is accommodated. It is comprised from the flange part 111b extended in a direction. The cylindrical wall portion 111 a corresponds to an encircling portion constituting a part of the first wall portion that defines the cavity 104. The leg portions 108d of the webs 108a to 108c whose one ends are integrally fixed to the housing 125 are integrally fixed to an end portion on one axial side (suction direction) side of the cylindrical wall portion 111a. . In this example, these leg portions 108d, the connecting portion 108e, or the housing 125 constitute spacer means. The projecting dimension in the axial direction of the legs 108d is such that a space (formed between the two legs 108d) formed when an opposing member that is entirely opposed to the cavity 104 is disposed on the coupling part 108e and the housing 125. , Or a gap formed between the end face of the cylindrical wall portion 111a and the connecting portion 108e) is determined to have a dimension capable of establishing a suction pressure capable of sucking sufficient air into the cavity 104. That is, this dimension is a dimension that generates a pressure difference in which wind flows in the space G formed by the leg portion 108d when the impeller 103 rotates.
[0036]
As for the flange part 111b, the part corresponding to the side discharge port 105 is extended longer than the other part. The flange portion 111b has four through holes.h... is formed. 4 through holesh... of the two through holes located diagonallyhThe first casing half 111 is screwed to the heat sink (second casing half) 112.
[0037]
As shown in FIG. 11, the heat sink 112 includes a base 112a constituting a second wall portion facing the impeller 103, and is integrally provided on the surface of the base 112a and extends along three sides of the base 112a. The rib 112b includes a plurality of heat radiation fins 112c provided corresponding to one side of the base 112a where the rib 112b is not provided. The base 112 a has a contour shape substantially the same as the contour of the flange portion 111 b of the first casing half 111. The rib 112b includes a flat portion 112b1 with which the flange portion 111b of the first casing half 111 contacts, and an inclined portion 112b2 that inclines from the flat portion 112b1 toward the base 112a. The inclined portion 112b2 has a horseshoe shape or a U-shape when viewed in FIG. Each of the heat radiation fins 112c extends substantially radially from the center side of the base 112a toward one short side of the base 112a. Each of the radiating fins 112c is erected so as to be orthogonal to the base 112a and is integrally provided with the base 112a, and the thickness dimension increases toward one short side (side discharge port 105) of the base 112a. The rib 112b has a first casing half 111Flange partThrough hole provided in 111bhFour screw holes SH that are aligned with ... are formed. Through hole in which screw 110 is not screwedh... and the screw hole SH are used for mounting the cooling device.
[0038]
In this example, the air sucked from the openings on the webs 108a to 108c side of the cavity 104 flows along the surface of the base 112a surrounded by the ribs 112b of the heat sink 112 as shown in FIG. From the side discharge port 105. An electronic component such as a CPU or MPU is mounted on the back surface of the base 112a of the heat sink 112 using a holder.
[0039]
In this example, since the spacer means (108d, 108c, etc.) is provided, even if the opposing member made up of the wall portion of the storage case of the electronic device is disposed close to the webs 108a-108c and the housing 125. The air can be discharged from the side discharge port 105, and the electronic component can be cooled.
[0040]
Even in this example, in order to increase the amount of air blown from the side discharge port 105, most of the air discharged from the side discharge port 105 is located on the suction direction side of the cavity 104 (or the cylindrical wall portion 111a).Suction side openingThe axial direction dimension of the cylindrical wall portion 111a or the shape dimension of the side discharge port 105 is determined so that the air circulation phenomenon that is immediately sucked from the air does not occur.
[0041]
In this example, the motor (the axis of the rotating shaft 127) is not arranged at the center of the heat sink 112. The motor (the axis line of the rotating shaft 127) extends from the central portion of the heat sink 112 to one direction of the longitudinal direction of the heat sink 112 (Side outlet(Direction away from 105). With this configuration, oneSide outletWhen air is discharged from 105, the cooling efficiency is increased.
[0042]
12A and 12B are a sectional view of a modification of the example shown in FIGS. 9 to 11 and a plan view of a heat sink to be used. In these drawings, the same members as those shown in FIGS. 9 to 11 are denoted by the same reference numerals as those shown in FIGS. 9 to 11 plus 100. This example also has one side discharge port 105 ′. The difference from the example of FIGS. 9 to 11 is a rib surrounding the periphery of the impeller 103.112bThis is that the entire circumference of the impeller 103 is surrounded by the heat radiation fins 212c without using. The passage 212d of the radiating fin 212c located on one side on the side of the side discharge port 105 'is open toward the side discharge port 105', but between the radiating fins 212c located on the remaining three sides. The outer end portion of the formed passage 212d 'is closed.
[0043]
The other points are the same as the structure shown in FIGS. In the heat sink 212 used in this example, a plurality of heat radiating fins 212c are integrally provided on the surface of the base 212a so as to entirely surround the lower half of the impeller 103. A space surrounded by the radiation fins 212c constitutes a part of the cavity 104 ′. Also in this example, since the spacer means (108d, 108c, etc.) is provided, even if the opposing member composed of the wall portion of the storage case of the electronic device is disposed close to the webs 108a-108c and the housing 125, ,SideAir can be discharged from the discharge port 105 ′, and the electronic component can be cooled.
[0044]
13A and 13B show a sectional view of an embodiment having the structure shown in FIGS. 9 to 11 and the structure shown in FIG. 12 and a plan view of a heat sink to be used. . In these drawings, members similar to those shown in FIGS. 9 to 11 and FIG. 12 are given the same reference numerals as those shown in FIG. 12 plus dashes. In this example, the structure of the heat sink 212 'and the mounting position of the impeller 103 are different from the previous example. First, on the outer periphery of the heat sink 212 'Side outletA rib 212'b is provided so as to surround the outer periphery of the impeller 103 except for one side of the 105 'side. And the radiation fin 212'cSide outlet105 'side and thisSide outletArranged along one side adjacent to 105 '. These radiating fins 212'c are shaped so as to extend along the flow of air discharged from the impeller 103 when the impeller 103 rotates in the clockwise direction. That is, the shape of the radiating fins 212'c is determined so as not to have a large resistance to the flow of air discharged from the impeller 103. The shapes of the heat radiation fins 212'c1 and 212'c2 are determined so that the air discharged from the impeller 103 flows along the inner surface of the rib 212'b. In this example, the center (axis line of the rotating shaft 127) C1 of the impeller 103 is located on one corner (side opposite to the side discharge port 105) of the heat sink 212 'from the center C0 of the heat sink 212' and the impeller 103. (The corner side located in the opposite direction to the rotation direction). According to this example, the heat radiation efficiency can be improved as compared with the example of FIG.
[0045]
14A to 14C show a plan view, a side view, and a cross-sectional view of another embodiment of the present invention. In these drawings, the same members as those shown in FIGS. 9 to 11 and 12 are denoted by the same reference numerals as those shown in FIG. 12 plus 100. In this example, four side discharge ports 305 that open toward the four sides of the heat sink are formed. In this example, the contour shapes seen in the plan view of the heat sink 312 constituting the first casing half 311 and the second casing half are substantially square. This example is particularly different from the examples of FIGS. 9 to 13 in that the leg portions 308d of the three webs 308a to 308c constituting the spacer means are connected by the arc-shaped reinforcing connecting piece 310. is there. If it does in this way, it will seem that the three window parts extended in the circumferential direction were formed in the cylindrical wall part 311a. These windows serve the same function as the gap G in FIGS. According to this example, the mechanical strength of the first casing half 311 increases.
[0046]
FIG. 15 is a perspective view showing another example of the embodiment of the present invention, and FIG. 16 is a cross-sectional view of a main part in a state where the cooling device of FIG. 15 is housed inside the electronic apparatus. The cooling device shown in these drawings is used for the purpose of cooling an electronic component having a large heat generation area, such as a plasma display device. Therefore, unlike the above examples, in this example, the cooled wall portion (heat generating portion) 413 of the electronic component is used as a part of the casing 401 of the cooling device. That is, the wall portion to be cooled of the electronic component (second wall portion facing the impeller 403 in the wall portion of the casing 401 and preventing the air absorbed through the cavity 404 from flowing in the other axial direction) Exothermic part) 413 is used. The sucked air flows along the wall to be cooled (heat generating part) 413 constituting the second wall part.
[0047]
The casing 401 includes a first casing portion 411 and a second casing portion 412. The first casing portion 411 includes a cylindrical wall portion 411a that forms a surrounding portion that surrounds a half portion on one side in the axial direction of the impeller 403 over the entire circumference, and a radial direction from the base portion of the cylindrical wall portion 411a. The flange portion 411b extends. The flange portion 411b has a rectangular outline shape. And the through-hole 411c ... for attachment is formed in the four corners of the flange part 411b. The housing 425 of the motor 402 is connected to an end portion in one axial direction of the cylindrical wall portion 411a by three webs 408. Also in this example, the space G that allows the legs 408d of the webs 408 ... to protrude from the end of the cylindrical wall 411a toward the one direction and to suck air into the cavity 404 from the radial direction of the rotation shaft. The spacer means is formed. The second casing portion 412 includes a rectangular flat plate portion 412a that constitutes a third wall portion that substantially faces the cooled wall portion 413 that constitutes the second wall portion with a predetermined gap therebetween, and The flat plate portion 412a includes a pair of side wall portions 412b and 412c provided on the two long sides and extending toward the cooled wall portion 413. As shown in FIG. 16, there is a first casing at a substantially central portion of the flat plate portion 412a.portionA through hole 412d into which the cylindrical wall portion 411a of 411 is fitted is formed. As shown in FIG. 15, the flat plate portion 412a is formed with four through holes 412e for mounting that are aligned with the through holes 411c provided in the flange portion 411b of the first casing portion 411. The first casing portion 411 and the second casing portion 412 are fixed by screwing screws into the aligned through holes 411c and 412e.
[0048]
In this example, two discharge ports are formed at both ends of the second casing portion 412 in the longitudinal direction. As shown in FIG. 16, this cooling device is mounted with the cooled wall portion 413 of the electronic device as a part of the casing, and an opposing member W made of a storage case or circuit board of the electronic device is attached to the housing 425 of the motor 402 When arranged close to each other, a space G having a height corresponding to the protruding dimension of the leg 408d of the web 408 is formed on the suction side. Also in this example, the protruding dimension of the leg 408d of the web 408 or the protruding dimension of the housing 425 is a dimension that can establish a suction pressure that can suck sufficient air into the cavity 404, that is, the leg 408d when the impeller 403 rotates. The dimension in which the pressure difference in which the wind flows is generated in the space G formed by the above is determined. Accordingly, even in such a state, air is sucked into the cavity 404 through a passage formed between the facing member W and the flat plate portion 412a constituting the third wall portion, and the flat plate portion 412a and the second wall portion are sucked. Through the passage formed between the wall to be cooled 413 constituting theDischarge port405 is discharged.
[0049]
According to this example, air can be flowed along the to-be-cooled wall part of a large area using one air blower. In addition, although the cooling device of FIG. 15 is provided with the two discharge ports 405, as shown in FIG.portionThe discharge port 405 ′ may be provided only at one end in the longitudinal direction of 412 ′. In this case, the air blower is disposed close to the end located on the side opposite to the discharge port 405 ′. In this way, even if there is only one discharge port 405 ′, the air sucked by the impeller 403 flows along the entire surface of the wall to be cooled 413.
[0050]
In the above example, the opposing member W is in contact with the housing 425 and the web 408 of the motor 403. However, if there is a dimensional margin, a space may be formed between the opposing member W and these members. Of course it is good. In the above example, the second casing portion 412 constitutes a duct structure.
[0051]
FIG. 18 shows a modification of the cooling device shown in FIGS. 15 and 17. This example is different from the cooling device shown in FIGS. 15 and 17 in that four cylindrical pillars 511d... Are integrally provided at the four corners of the flange portion 511b of the first casing portion 511. In each pillar 511d, a through hole 511c is formed. The screws are screwed into the through holes 511c and the four through holes 512d provided in the second casing portion 512, and the first casing portion 511 is fixed to the second casing portion 512. In this example, the four pillars 511d... Function as spacers that maintain the spatial dimension between the cooled wall portion 513 and the flat plate portion 512a constituting the third wall portion. Therefore, the opposing member W is the housing 525 of the motor 502 or the web.508Even when strongly pressed against the flat plate portion 512, the flat plate portion 512 is curved and the impeller 503 isCooled wall513 can be prevented from coming into contact.
[0052]
FIG. 19 is a cross-sectional view showing an example of another embodiment of the cooling device of the present invention, and FIG. 20 is a plan view of a blower used in this example. Similarly to the cooling devices shown in FIGS. 15 to 18, this cooling device is also configured such that the second wall portion of the casing 601 is constituted by an electronic component cooled wall portion 613. However, this cooling device is largely different from the cooling device shown in FIGS. 15 to 18 in that there is no equivalent to the second casing portion (412 and 512). This cooling device stirs air inside a duct D formed between the facing wall portion W and the wall portion 613 to be cooled. The casing 601 includes a cylindrical wall portion 611a that constitutes an encircling portion (first wall portion) that surrounds a half portion on one side in the axial direction of the impeller 603 over the entire circumference, a flange portion 611b that has a rectangular outline shape, and The flange portion 611b is integrally provided at the four corners, and includes a casing portion 611 including four pillars 611d having through holes 611c therein, and a part of the cooled wall portion 613. In this cooling device, the discharge port 605 opens 360 degrees around the impeller 603 (that is, opens over the entire radial direction of the lower half of the impeller 603). The axial dimension of the cylindrical wall portion 611a is such that an air sneaking phenomenon occurs in which most of the air exhausted from the discharge port 605 is directly sucked from the opening located in one direction (suction direction) of the cavity 604. It has dimensions that can be suppressed. Accordingly, as shown by the arrows in FIG. 19, the air discharged from the discharge port 605 is somewhat ducted.DAfter flowing along the wall to be cooled 613, the air is sucked again. Therefore, air circulates in a certain range within the duct D. The pillar 611 is used for mounting the facing member W and the casing portion 611 and functions as a spacer that maintains a space between the wall to be cooled 613 and the facing member W. In this example, the pillars 611... And the legs 608 d of the web 608 constitute spacer means for forming a space G that allows air to be sucked into the cavity 604 from the radial direction of the rotation shaft.
[0053]
In each of the above examples, the spacer means is constituted by the web leg, the pillar provided in the motor housing or casing, etc., but the protrusions constituting the spacer means are further integrated on the web and motor housing. It may be formed. Even when the surface of the web and motor housing and the end surface of the cylindrical wall portion of the casing are formed flush with each other, a space that allows air to be sucked into the cavity from the radial direction of the rotating shaft is formed. can do.
[0054]
【The invention's effect】
According to the invention of this application, the spacer means for securing a space allowing air to be sucked into the cavity is constituted by a part (a plurality of webs and housings) of the electronic component cooling device. Without preparing as a separate member, a space for sucking air into the cavity can be ensured.
[Brief description of the drawings]
[Figure 1]ElectronicOne part cooling devicereferenceIt is a perspective view of an example.
FIG. 2 is a cross-sectional view of the cooling device of FIG.
[Fig. 3]ElectronicOther parts cooling devicereferenceIt is a perspective view of an example.
4 is a cross-sectional view of the apparatus of FIG.
FIG. 5 shown in FIGS. 1 and 2Reference exampleIt is the schematic which shows the attachment aspect at the time of cooling the electronic component accommodated in the storage case of the electronic device cooling device.
6 is fixed to a heat sink for cooling the microprocessor using the electronic component cooling apparatus of FIGS. 1 and 2. FIG.referenceIt is the schematic of an example.
7 shows another type of electronic component cooling apparatus shown in FIGS. 3 and 4; FIG.SaWhen coolingreferenceIt is the schematic of an example.
FIG. 8 shows another type of electronic component cooling apparatus shown in FIGS. 3 and 4;SaWhen coolingreferenceIt is the schematic of an example.
FIG. 9 shows an electronic component cooling apparatus according to the present invention.The fruitIt is a top view of an example of an embodiment.
10 is a cross-sectional view of the apparatus of FIG.
11 is a plan view of a heat sink used in the apparatus of FIG.
FIGS. 12A and 12B are views of the electronic component cooling apparatus of the present invention.otherIt is sectional drawing of embodiment and a top view of the heat sink to be used.
13A and 13B are a sectional view of a modification of the example shown in FIGS. 9 to 11 and a plan view of a heat sink to be used.
FIGS. 14A to 14C are views of the electronic component cooling apparatus according to the present invention.otherIt is the top view of embodiment, a side view, and sectional drawing.
FIG. 15 shows an electronic component cooling apparatus according to the present invention.MoreIt is a perspective view of other embodiment.
16 is a cross-sectional view of a main part in a state where the cooling device of FIG.
FIG. 17 is a perspective view of still another embodiment of the electronic component cooling device of the present invention.
18 is a cross-sectional view showing a modified example of the cooling device shown in FIGS. 15 and 17. FIG.
FIG. 19 is a cross-sectional view showing an example of another embodiment of the electronic component cooling device of the present invention.
20 is a plan view of the air blower used in the example of FIG.
[Explanation of symbols]
1,101,401,501,601 casing
11 Perimeter wall
12 Blocking wall
13, 111a, 311a, 411a, 511a, 611a cylindrical wall
2,102,302,402,502,602 Motor
21,121 rotor
22,122 stator
3,103,303,403,503,603 Impeller
31,131,331,431,531,631 blade
4,104,304,404,504,604 cavity
5,105 Side outlet
6 Through hole
7 Pillar
8 Mounting bracket
108a-108c, 308, 408, 508, 608 web
413, 513, 613 Cooled wall (second wall)
W Opposite wall

Claims (3)

  A motor having a rotor and a stator;
  An impeller fixed to the rotor having a plurality of blades for sucking air from one of the axial directions of the rotating shaft of the motor;
  A casing having a cavity in which the impeller is stored;
  Spacer means for projecting toward the one direction and forming a space allowing air to be sucked into the cavity from the radial direction of the rotating shaft,
  The electronic component cooling apparatus according to claim 1, wherein the spacer means is constituted by a plurality of web leg portions that support the housing of the motor with respect to the casing.   A motor having a rotor and a stator;
  An impeller fixed to the rotor having a plurality of blades for sucking air from one of the axial directions of the rotating shaft of the motor;
  A casing having a cavity in which the motor and the impeller are housed,
  The casing has a first wall portion surrounding the impeller so as to define the cavity, and is positioned on the other side of the axial direction with respect to the impeller so as to face the impeller and toward the other direction. A second wall for preventing the air from flowing; and a discharge port for discharging the air sucked through the cavity and flowing along the second wall;
  A housing of the motor is supported at an end portion in the one direction of the first wall portion via a plurality of webs arranged at intervals in the circumferential direction,
  The plurality of webs constitute spacer means that protrudes in the one direction and forms a space that allows air to be sucked into the cavity from the radial direction of the rotating shaft. Electronic component cooling device.   A motor having a rotor and a stator;
  A plurality of blurs for sucking air from one axial direction of the rotating shaft of the motor. An impeller fixed to the rotor having a blade;
  A casing having a cavity in which the motor and the impeller are housed,
  The casing has a first wall portion surrounding the impeller so as to define the cavity, and is positioned on the other side of the axial direction with respect to the impeller so as to face the impeller and toward the other direction. A second wall for preventing the air from flowing; and a discharge port for discharging air sucked through the cavity and flowing along the second wall,
  The second wall portion of the casing is constituted by a cooled wall portion of an electronic device to be cooled;
  A housing of the motor is supported at an end portion in the one direction of the first wall portion via a plurality of webs arranged at intervals in the circumferential direction,
  The first wall portion completely prevents the impeller from generating an air sneak phenomenon in which much of the air exhausted from the discharge port is immediately sucked from an opening located in the one direction of the cavity. It has a go part that surrounds the circumference,
  The leg portions of the plurality of webs or the housing constitute spacer means that protrudes in the one direction and forms a space that allows air to be sucked into the cavity from the radial direction of the rotating shaft. An electronic component cooling device characterized by being formed as described above.

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