JPH11315799A - Fan device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fan device that can reduce the overall height of the device itself and the overall height of the space for installing it. SOLUTION: This fan device comprises a device casing 2, a motor means disposed in the device casing 2, and a shuttlecock body that is rotatively driven by the motor means. The device casing 2 is constituted by a casing main body 4 and a heat sink 6. A suction port 50 is formed on a sidewall 45 of the heat sink 6, and a discharge port 52 is formed on a sidewall 47 opposite to the sidewall 45. The suction port 50 and the discharge port 52 are substantially aligned in the direction of the axial line. Moreover, a throttle protruding portion 56 which projects toward the rotation passage of the shuttlecock body is provided at the downstream of the discharge port 52, viewed from the rotation direction of the shuttlecock, at the sidewall 47 of the heat sink 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan device for cooling an internal space of an electronic device such as a copying machine, a laser printer, a personal computer, or the like, or an electronic component used for the device.

[0002]

2. Description of the Related Art A fan motor having a heat sink for cooling electronic components such as a microprocessor has been proposed and put to practical use. As this kind of fan device,
For example, there is one disclosed in Japanese Utility Model Laid-Open No. 7-32996. This known fan motor comprises a device casing having a heat sink for heat dissipation, in which the motor means is arranged. The motor means includes a stator mounted on the device casing and a rotor that is rotatable relative to the stator, and the rotor is provided with blades. In this fan device, an opening is formed on one end surface of the device casing, an opening is formed on a peripheral side wall of the device casing, and a plurality of cooling fins are provided in the opening on the peripheral side wall. The opening formed in the end wall acts as a suction port for sucking air (or a discharge port for discharging air), and the opening formed on the peripheral side wall serves as a discharge port (or suction port). Works.

Further, as a fan device for cooling an internal space of an electronic device or an electronic component, there is a fan device disclosed in Japanese Patent Application Laid-Open No. 8-331801, for example. Such a known fan device includes a box-shaped device casing, in which motor means is provided, and a rotor of the motor means is provided with a blade. In this fan device, a pair of openings are formed in the peripheral side wall of the device casing. One opening functions as a suction port for sucking air, and the other opening functions as a discharge port for discharging suctioned air.

[0004]

However, all of the above-mentioned fan devices have the following problems to be solved. That is, in the fan device disclosed in Japanese Utility Model Laid-Open Publication No. 7-32996, the air from the outside is sucked from the opening of the end wall (or the peripheral side wall) of the device casing by rotating the blade body in a predetermined direction. The sucked air is discharged from an opening in the peripheral side wall (or end wall) of the device casing. Therefore, a sufficient space is required above the apparatus casing for sucking air from outside (or discharging the sucked air), and there is a problem that the total height of the space for mounting the fan apparatus is increased.

In the fan device disclosed in Japanese Patent Application Laid-Open No. 8-331801, the suction port and the discharge port are provided on the peripheral side wall of the apparatus casing, so that air is sucked (or discharged) above the apparatus casing. There is no need for space for the fan device, and the overall height of the space for mounting the fan device can be somewhat reduced. However, since the suction port and the discharge port are displaced in the vertical direction, the overall height of the fan device cannot be sufficiently reduced. When the overall height of the fan device is reduced, the sizes of the suction port and the discharge port become small, and as a result, it becomes difficult to secure a sufficient amount of blown air.

[0006] The total height of the fan device itself and the total height of the space for mounting the fan device may not be able to sufficiently cope with the recent miniaturization and thinning of notebook personal computers and the like. Thinning is desired.

An object of the present invention is to provide a fan device capable of keeping the overall height of itself and the overall height of a space for mounting the fan device low.

[0008]

According to the present invention, there is provided an apparatus casing for defining an accommodation space, motor means disposed in the accommodation space, and a blade body which is rotationally driven in a predetermined direction by the motor means. The device casing includes: a peripheral side wall that covers an outer peripheral side of the blade body; and a pair of end walls that substantially close both end surfaces of the peripheral side wall, and a part of the peripheral side wall includes air. A suction port for suction and a discharge port for discharging the sucked air are formed, and the suction port and the discharge port are substantially aligned in the axial direction,
The motor means includes a stator attached to the device casing, and a rotor that is rotatable relative to the stator, wherein the blade body is provided on the rotor, and the blade is provided on the peripheral side wall of the device casing. A fan provided with a throttle projection protruding toward a rotation path of the blade body at a position between the discharge port and the suction port when viewed in the rotation direction of the blade body. Device.

According to the present invention, the apparatus casing is constituted by a pair of end walls and a peripheral side wall, and a suction port and a discharge port are formed in the peripheral side wall, so that external air is sucked from the suction port. Exhausted through the rear outlet, the air flow is in a direction substantially perpendicular to the axial direction of the fan device. Therefore, there is no need for a space for sucking or discharging air above the device casing. Further, since the suction port and the discharge port are aligned in the axial direction, a sufficiently large opening can be secured even if the width of the peripheral side wall is small. Air volume can be secured. Also, since a throttle projection projecting toward the rotation path of the blade is provided at a portion of the peripheral side wall of the device casing between the discharge port and the suction port,
The air is compressed by the throttle projection, whereby the wind pressure of the airflow near the throttle projection is increased.Thus, most of the air flowing from the suction port is discharged from the discharge port and passes through the throttle projection. The amount of air flowing downstream can be suppressed.

The present invention is characterized in that the throttle projection is provided on a portion of the peripheral side wall of the device casing, which defines a downstream side of the discharge port as viewed in a rotation direction of the blade. I do.

According to the present invention, since the throttle projection is provided on the peripheral side wall at a position defining the downstream side of the discharge port, the air flowing from the suction port is guided to the discharge port by the throttle projection. Thus, the sucked air can be efficiently discharged from the discharge port.

Further, the present invention is characterized in that a plurality of cooling fins are provided at intervals on the suction port and / or the discharge port of the apparatus casing.

According to the present invention, since the cooling fin is provided at the suction port and / or the discharge port of the apparatus casing, the cooling effect is enhanced by the cooling fin, for example, for directly cooling electronic components. Can be applied conveniently.

Further, according to the present invention, the apparatus casing comprises a casing body constituting one of the pair of end walls, and a heat sink constituting the other of the pair of end walls and the peripheral side wall. The motor means is attached, and the cooling fin is provided on the heat sink.

According to the present invention, since the device casing is composed of the casing body and the heat sink, it can be advantageously applied as a device for directly cooling the electronic components.

Further, according to the present invention, the pair of end walls of the device casing are rectangular, and the peripheral side wall is composed of four side walls provided between the pair of end walls. The discharge port is formed on one side, and the suction port is formed on one side wall adjacent to the side wall on which the discharge port is formed.

According to the present invention, since the suction port is provided on the side wall adjacent to the side wall on which the discharge port is formed, air sucked from the suction port can be efficiently discharged from the discharge port.

Further, the present invention is characterized in that the suction port and the discharge port are formed over substantially the entire width of the device housing.

According to the present invention, since the suction port and the discharge port are formed over almost the entire height of the apparatus housing,
Even if the fan device itself is thin, a large opening can be ensured, whereby a sufficient air flow can be ensured.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. First Embodiment First, a first embodiment of a fan device according to the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a first embodiment of a fan device according to the present invention,
FIG. 2 is an exploded perspective view showing the fan device of FIG. 1 in a disassembled state into a casing body and a heat sink, FIG. 3 is a plan view showing the heat sink, and FIG. 4 is a thrust bearing piece mounted on the heat sink and the thrust bearing piece. It is a partial expanded sectional view showing the related composition.

In FIGS. 1 and 2, the illustrated fan device includes a substantially box-shaped device casing 2 which is composed of a casing body 4 and a casing body 4.
The motor means 5 is attached to the casing main body 4.

First, the casing main body 4 and the motor means 5 will be described. The illustrated casing main body 4 is formed of a synthetic resin and has a substantially rectangular main body 8.
Projections 10 projecting toward the heat sink 6 are provided at four side edges of the main body 8. A circular opening is formed in the center of the casing body 4, and a cylindrical support wall 16 is integrally provided in this opening.

The motor means 5 has a rotor 18 driven to rotate in a predetermined direction, and the rotor 18 is rotatably supported. The rotor 18 has a cup-shaped rotor body 20, which has an end wall 22 and an end wall 2.
2 has a peripheral wall portion 24 extending from the outer peripheral edge. A rotating shaft 26 is fixed to the end wall 22. One end (upper end) of the rotating shaft 26 extends upward from the end wall 22 in FIG. 1, and the other end (lower end) is an end wall. FIG. 1 from the part 22
At the bottom. In this embodiment, the vicinity of one end of the rotating shaft 26 is rotatably supported by the support wall 16 via one ball bearing 28 constituting a radial bearing,
The ball bearing 28 supports a radial load acting on the rotating shaft 26. The other end of the rotating shaft 26 is rotatably supported by the heat sink 4 via a thrust bearing piece 30, as will be described later.
To support the thrust load acting on the In the first embodiment, a step 16 a is provided on the support wall 16, and the outer ring 33 of the ball bearing 28 is fixed by an adhesive so as to contact the step 31.

A rotor magnet 36 is mounted on the inner peripheral surface of the peripheral wall 24 of the rotor 18 via an annular yoke 34. Further, a stator 38 is provided so as to face the rotor magnet 36. The stator 38 constituting a part of the motor means 5 has a stator core 40 and a coil 42 wound around the stator core 40.
Is attached to the outer peripheral surface of the support wall 16 of the casing body 4.

The rotor 18 is provided with blades 31 for generating an air flow. The blade body 31 is composed of a plurality of blades 32, and the blades 32 are provided on the outer peripheral surface of the peripheral wall portion 24 of the rotor 18 at intervals in the circumferential direction.

Next, the heat sink 6 will be described with reference to FIG. 3 together with FIG.
Has a substantially rectangular heat sink body 44. The four side edges of the heat sink body 44 have side walls 4 respectively.
5, 46, 47 and 48 are provided, and these side walls 45 to 4 are provided.
8 constitutes a peripheral side wall of the device casing 2. In this embodiment, a rectangular notch is formed in one side wall 45 of the heat sink 6, and a rectangular notch is also formed in a side wall 47 facing the side wall 45. In the height direction of the fan device, the notch extends from the upper surface of the side walls 45 and 47 (the surface in contact with the casing body 4) to the inner surface of the heat sink body 44, and extends in the vertical direction of the fan device (FIG. 2).
In the direction from the lower left to the upper right, and the vertical direction in FIG. 3)
Are formed over substantially the entire length except for both ends thereof. In this embodiment, as understood from FIGS. 1 and 2, when the heat sink 6 is mounted on the casing body 4, the suction port 50 is formed by the notch formed on the side wall 45, and the suction port 50 is formed on the opposing side wall 47. The notch forms the discharge port 52. Since the suction port 50 and the discharge port 52 are formed by such notches, the suction port 50 and the discharge port 52 are provided over substantially the entire height of the fan device and over substantially the entire length in the lateral direction. Large suction port 5 even in casing 2
0 and the discharge port 52 can be formed, and the amount of air blown by the fan device can be increased.

In this embodiment, the arrow 54 of the blade 31
When viewed in the rotation direction shown in FIG.
A throttle projection 56 is provided between the first and second members. Throttle projection 5
Numeral 6 protrudes from the peripheral side wall of the apparatus casing 2, in this embodiment, from the inner peripheral surface of the side wall 47 toward the rotation path of the blade body 31. The aperture projection 56 extends to the vicinity of the rotation path of the blade body 31, and reduces the gap with the tip of the rotating blade body 31 (tip of the blade 32). By providing the throttle projection 56 in this way, the flow of air generated by the rotation of the blade body 31 is restricted by the throttle projection 56. Therefore, the pressure of the air flow in the vicinity of the throttle protrusion 56 increases, and most of the generated air flow flows toward the discharge port 52 having a low pressure, and the air thus sucked flows from the discharge port 52 to the outside. Is discharged. When the amount of protrusion of the throttle projection 56 is small, in other words, when the gap between the tip of the throttle projection 56 and the rotation path of the blade body 31 (the tip of the blade body 31) is large, the generated air flow becomes smaller. , And flows toward the suction port 50, whereby the amount of air blown by the fan device is reduced, and the cooling effect is also reduced. For this reason,
It is desirable that the tip of the throttle projection 56 be close to the rotation path of the blade body 31. Although it is important that the throttle projection 56 is provided between the discharge port 52 and the suction port 50, in order to guide the air flow to the discharge port 52 more effectively, as shown in FIGS. On the peripheral side wall of the device casing 2,
It is desirable to provide a portion that defines the downstream side of the discharge port 52 in the rotation direction of the blade body 31, that is, a portion that defines the downstream side of the discharge port 52 on the side wall 47. In addition, the wing body 31
Can be formed in a shape suitable for generating an air flow from the suction port 50 toward the discharge port 52, and the inner surface of the side wall 48 of the heat sink 6 also applies the air sucked from the suction port 50 to the blade body 31. It can be formed in a shape suitable for being guided to the discharge port 52 by rotation.

The thrust bearing piece 30 (not shown in FIG. 3) is mounted at the center of the heat sink body 44 corresponding to the rotating shaft 26 of the motor means 52. The thrust bearing piece 30 is formed in, for example, a short cylindrical shape, and is fixed to a circular concave portion formed in the heat sink body 44 with an adhesive or the like. The thrust bearing piece 30 is formed of a synthetic resin material, a ceramic material, a wear-resistant metal material, an oil-impregnated metal material, or the like.

In connection with the thrust bearing piece 30, it is desirable to configure as follows. Referring to FIG.
6 is formed so that its other end is substantially hemispherical, in other words, its axial cross-sectional shape is an arc shape protruding toward the thrust bearing piece 30. Also, the thrust bearing piece 3
For 0, a supporting concave portion 54 for supporting the rotating shaft 26 is provided on the surface thereof, and the supporting surface of the supporting concave portion 54 is formed so as to have a substantially hemispherical concave shape, in other words, so that its cross-sectional shape becomes an arc shape toward the inside. Is done. It is desirable that the radius of curvature R1 of the other end of the rotary shaft 26 be set smaller than the radius of curvature R2 of the support recess 54 of the thrust bearing piece 30 (R2> R1). By setting the radii of curvature R1 and R2 of the rotating shaft 26 and the thrust bearing piece 30 in this manner, the contact portion between the rotating shaft 26 and the thrust bearing piece 30 becomes substantially a point contact. 26 can be rotatably and stably supported.

This fan device can be advantageously used for directly cooling electronic components such as microprocessors, in which connection the heat sink 4 is constructed as follows. The heat sink 6 is formed of a material having good heat conductivity, for example, a metal material such as aluminum or an aluminum alloy. Further, a plurality of cooling fins 58 are provided at predetermined intervals in the suction port 50 and the discharge port 52 of the apparatus casing 2. As shown in FIGS. 2 and 3, these cooling fins 58 are provided integrally with the heat sink body 44 and extend from the inner surface to the casing body 4. If a sufficient cooling effect can be obtained, the suction port 50 and / or the discharge port 52
May be omitted.

The casing body 4 and the heat sink 6 are
It is assembled as follows. Referring again to FIGS. 1 and 2, connecting wall portions 60 are provided at the four corners of the heat sink main body 44, and connecting connecting portions 62 protruding toward the casing main body 8 are integrally formed on each of the connecting wall portions 60. Is provided. On the other hand, receiving recesses (both not shown) are provided at the four corners of the casing body 8 in correspondence with the respective connecting projections 62. Therefore, the casing main body 4 and the heat sink 6 are detachably attached to each other by inserting the respective connection protrusions 60 of the heat sink 6 into the corresponding receiving recesses of the casing main body 4.

When the casing body 4 and the heat sink 6 are connected to each other, as understood from FIGS.
The protrusion 10 provided on the casing body 4 and the side walls 45 to 48 of the heat sink 6 constitute a peripheral side wall of the device casing 2, and the peripheral side wall covers the outer periphery of the blade body 31.
The casing body 4 constitutes one end wall of the device casing 2 and substantially closes one end face (upper end face) of the peripheral side wall. Further, the heat sink body 44 constitutes the other end wall of the device casing 2 and substantially closes the other end surface (lower end surface) of the peripheral side wall. Therefore, as will be easily understood, the device casing 2 defines a housing space by the pair of end walls and the peripheral side walls, and the motor means 5 and the blade body 31 are housed in the housing space.

In this embodiment, the rotating shaft 26 of the motor means 5 is magnetically biased toward the thrust bearing piece 30. As shown in FIG.
The magnetic center in the axial direction of 0 (vertical direction in FIG. 1) is at the position of the axis L1, and the magnetic center of the rotor magnet 36 in the rotor 18 in the axial direction is at the position of the axis L2. The magnetic center of 36 is shifted to the side opposite to the thrust bearing piece 30 side with respect to the magnetic center of the stator 30.
Therefore, due to the magnetic action of the stator 30 and the rotor magnet 36, a magnetic biasing force acts downward on the rotor 18 in FIG. 1, in other words, in the direction of the thrust bearing piece 30. By force, ball bearing 2
8, a preload is applied, and the rotating shaft 26 is securely supported by the thrust bearing piece 30.

Such a fan device is suitable for directly cooling electronic components. As shown in FIG. 1, a heat sink main body 44 of a heat sink 6 is provided with an electronic component 64 to be cooled, for example, a microprocessor. Attached, the attachment is made via double-sided tape 66 or adhesive or directly using mounting screws. When the fan device is attached to the electronic component 66, the electronic component 6
The heat from 6 is transferred to heat sink 66 and cooled via heat sink 66.

In this mounting state, when the motor means 5 is urged to rotate the rotor 18 in a predetermined direction, the arrow 7
0 (FIGS. 1 and 3), external air is sucked through the suction port 50 and the sucked air is
With the rotation of, the air flows in the rotation direction indicated by the arrow 54 (FIG. 3), flows toward the discharge port 52, and is thereafter discharged from the discharge port 52 to the outside as indicated by the arrow 72. Therefore, the air flow flows in the axial direction of the fan device, in other words, in a direction substantially perpendicular to the rotation axis of the rotor 18, so that the overall height of the fan device is small and even if there is no space above the fan device. A sufficient air volume can be secured. This air flow forcibly cools the heat sink 6,
The electronic component 64 is cooled via the. The air flowing from the suction port 50 flows between the cooling fins 58, and the air discharged from the discharge port 52 flows between the cooling fins 58, whereby the cooling effect of the fan sink 6 can be enhanced. .

The fan motor of this embodiment has a rotating shaft 2
6 has the following features in relation to the bearing structure supporting the same. That is, since the rotating shaft 26 is rotatably supported by one ball bearing 28 and the thrust bearing piece 30, the overall height of the fan motor is lower than that of the conventional type using two ball bearings. The present invention can be advantageously applied to cooling of electronic components in a device having a limited built-in space such as a notebook computer. Further, since only one relatively expensive ball bearing 28 is used, the manufacturing cost of the fan motor can be reduced.

In the first embodiment, the suction port 50 is provided on one side wall 45, but a suction port can be provided on the side wall 46 and / or the side wall 48 instead. In addition, sidewalls 46 and / or sidewalls 4
8, suction ports can also be provided, and in these cases, cooling fins can also be provided in these suction ports.

Second Embodiment FIGS. 5 and 6 show a fan device according to a second embodiment of the present invention. FIG. 5 is a sectional view showing a second embodiment of the fan device according to the present invention, and FIG. 6 is a plan view showing a cover casing of the fan device of FIG. The fan device according to the second embodiment can be advantageously applied to cool the internal space of the electronic device, a cover casing is used instead of the heat sink in the first embodiment, and the rotor is rotatable. The bearing structure to be supported has been modified. Note that, in the second embodiment, the same reference numerals are given to substantially the same components as those in the embodiments of FIGS. 1 to 4 and the description thereof is omitted.

Referring to FIGS. 5 and 6, the bearing structure in the fan device of this embodiment is as follows.
The cover casing 102 has a substantially rectangular cover body 10.
4 in the center of the cover main body 104.
Similar to the heat sink body 44 of FIG. 4, a thrust bearing piece 30 (omitted in FIG. 6) is mounted corresponding to the rotating shaft 26 of the rotor 18, and this thrust bearing piece 30 is provided.
Supports the end of the rotating shaft 26 rotatably. A step 106 is provided on the support wall 16 of the casing body 4, and the inner diameter of the support wall 16 on the base side (upper side in FIG. 5) is smaller than the inner diameter on the tip side. And the outer ring 33 of the ball bearing 28 constituting the radial bearing is
The support wall 16 is fixed to the tip end side with an adhesive so as to contact the step 106. The rotating shaft 26 fixed to the rotor 18 is axially movably inserted through an inner ring 35 of a ball bearing 28 fixed to the support wall portion 16 of the casing body 4, and is rotatable via the ball bearing 28. Are supported by the casing body 8.

In this embodiment, a preload applying spring 108 is used to apply a preload to the ball bearing 28.
This spring 108 is formed of a coil spring having an outer diameter at one end larger than an outer diameter at the other end, and one end of the spring 108 abuts on the inner surface (the upper surface in FIG. 5) of the end wall 22 of the rotor 18. The other end is in contact with the end face of the inner ring 35 of the ball bearing 28. By interposing the preload applying spring 108 in this way, the inner ring 35 of the ball bearing 28 is elastically biased upward in FIG. 5 by the action of the spring 108, whereby the preload is applied to the ball bearing 28.
Further, the preload applying spring 108 acts on the end wall portion 22 of the rotor 18 to elastically bias downward in FIG.
Thereby, the end (lower end) of the rotating shaft 26 is elastically pressed against the thrust bearing piece 30.

The cover casing 102 will be described mainly with reference to FIG.
The side walls 110, 112, 114, and 116 are provided on the four side edges of the cover body 104 of 02, respectively, and these side walls 110 to 116 constitute the peripheral side wall of the device casing 2. In this embodiment, a rectangular notch is formed in one side wall 110 of the cover casing 102, and this side wall 11
A rectangular notch is also formed on the side wall 114 facing the zero, and a notch is also formed on the side wall 116 between the side wall 110 and the side wall 114. These three notches are formed in the side walls 110, 114, 1 in the height direction of the fan device.
16 extends from the upper surface (the surface in contact with the casing body 4) to the vicinity of the inner surface of the cover body 102. In the vertical direction (vertical direction in FIG. 6) of the fan device, the cutouts of the side walls 110 and 114 are formed over substantially the entire length except for both ends thereof, and the cutouts of the side wall 116 are formed from one end in the horizontal direction. It extends to the middle part. In this embodiment, as understood from FIG. 5, when the cover casing 102 is attached to the casing main body 4, the suction ports 118 and 120 are formed by the cutouts formed in the side walls 110 and 116,
Further, a discharge port 122 is formed by a notch formed in the side wall 114 facing the side wall 110. Since the suction ports 118 and 120 and the discharge port 122 are formed by such notches, the suction ports 118 and 120 and the discharge port 12 are formed.
The suction port 11 is formed over substantially the entire height of the fan device and over substantially the entire width in the lateral direction of the fan device.
8, 120 and the discharge port 122 can be enlarged.

Also in the second embodiment, the blade body 3
A throttle projection 126 is provided between the discharge port 122 and the suction port 120 when viewed in the rotation direction indicated by the arrow 124 (FIG. 6). The throttle projection 126 protrudes from the inner peripheral surface of the peripheral side wall of the device casing 2A, in this embodiment, the side wall 114 of the cover casing 102 toward the rotation path of the blade body 31. The throttle projection 126 can be formed in the same manner as in the first embodiment. In addition, also in this form, in order to guide the air flow to the discharge port 122 more effectively,
As shown in FIG. 5, the peripheral side wall of the device casing 2 </ b> A is provided at a portion that defines the downstream side of the discharge port 122 when viewed in the rotation direction of the blade body 31, that is, at a portion that defines the downstream side of the discharge port 114 of the side wall 114. It is desirable.

In the second embodiment, when the casing main body 4 and the cover main body 102 are connected to each other, as understood from FIG. 5, the protrusion 10 provided on the casing main body 4 and the side walls 110 to 110 of the cover casing 102 are formed. 11
6 constitutes the peripheral side wall of the device casing 2A. The casing body 4 constitutes one end wall of the device casing 2A, substantially closes one end surface (upper end surface) of the peripheral side wall, and the cover casing 102 constitutes the other end wall of the device casing 2A. Then, the other end surface (lower end surface) of the peripheral side wall is substantially closed, and the device casing 2A defines a housing space for housing the motor means 5 by the pair of end walls and the peripheral side wall. Other configurations of the second embodiment are the same as those of the first embodiment.
The embodiment is substantially the same as the embodiment.

In this fan device, when the motor means 5 is urged to rotate the rotor 18 in a predetermined direction,
As shown by arrows 128 and 130 (FIG. 6), suction port 11
External air is sucked into the apparatus casing 2A through 8, 120, and the sucked air flows in the rotation direction indicated by the arrow 124 (FIG. 6) by the rotation of the rotor 18, and then as indicated by the arrow 132 (FIG. 6). Is discharged from the discharge port 132 to the outside. Therefore, the air flow flows in the axial direction of the fan device, in other words, in a direction substantially perpendicular to the rotation axis of the rotor 18, so that the overall height of the fan device is small and even if there is no space above the fan device. A sufficient air volume can be secured. In this embodiment, since the suction ports 118 and 120 are formed particularly in the side walls 110 and 116, the amount of air suction can be increased, and the amount of air blown can be further increased.

Since the fan device of this embodiment mainly performs air blowing, it is advantageously applied to discharge the warm air in the internal space of the electronic device to the outside and to indirectly cool the electronic components by the air flow. be able to.

In the second embodiment, the suction port 118 is provided in the side wall 110 of the cover casing 102, and the side wall 11 is
6 is provided with a suction port 120, but when a sufficient suction amount can be secured, the suction port of the side wall 120 can be omitted, and a suction port is formed in the side wall 112 as necessary. be able to.

Third Embodiment FIG. 7 is a sectional view showing a fan device according to a third embodiment of the present invention. In the third embodiment, the casing body is modified. In the third embodiment, members that are substantially the same as those in the second embodiment are given the same numbers, and descriptions thereof are omitted.

Referring to FIG. 7, in the third embodiment, the casing main body is formed of a circuit board 202. An electric circuit 204 for supplying a current to the coil 42 of the stator 38 of the motor means 5 as required is provided on the inner surface of the circuit board 202.
Has electronic components such as a semiconductor chip, a Hall element, and a resistor. A support wall member 206 (corresponding to the support wall portion 16 in the second embodiment) for supporting the rotor 18 is fixed to the circuit board 202. Circuit board 202
Are fixed to the four corners of the cover casing 102 by, for example, mounting screws 206. By fixing in this manner, the side walls 110 to 1 to 1 of the cover casing 102 are fixed.
16 constitutes a peripheral side wall of the apparatus casing 2B, the circuit board 202 constitutes one end wall of the apparatus casing 2B, substantially closes one end face (upper end face) of the peripheral side wall, and the cover casing 102 The other end wall of the device casing 2B is formed, and the other end surface (lower end surface) of the peripheral side wall is substantially closed.

In this embodiment, the suction port 118
The protrusion 110a is integrally provided on the outer surface of the side wall 110 on which is formed. The protrusion 110a protrudes outward in an arc shape in the vertical direction. Thus, the protrusion 110a
Is provided, even if the fan device is mounted such that the side wall 110 comes into contact with a component or the like in the electronic device, a gap for sucking air is secured between the side wall 110 and the component or the like. Thus, external air can be sucked in as required. Note that such a protrusion can be provided on the side wall 114 where the discharge port 122 is formed. Other configurations of the third embodiment include:
This is substantially the same as the second embodiment.

In the third embodiment, the suction port 118,
Since the basic structures of the 120, the discharge port 122, and the configuration related thereto are substantially the same, the same operation and effect as in the second embodiment are achieved. In addition, the circuit board 20
Since the casing 2 constitutes a casing main body, a dedicated casing main body is not required, and thus the configuration of the fan device can be simplified.

Fourth Embodiment FIG. 8 is a sectional view showing a fourth embodiment of the fan device according to the present invention. In the fourth embodiment, the device casing, the support structure of the rotor, and the blade are modified. In the fourth embodiment, members that are substantially the same as those in the second embodiment will be described with the same reference numerals.

Referring to FIG. 8, in the fourth embodiment, device casing 2C is substantially box-shaped and has four side walls. One side wall 204 of the device casing 202 (FIG. 8)
A left side wall), a discharge port 206 is formed, and a suction port 210 is formed in a side wall 208 adjacent to the one side wall 204 (a side wall located on the upstream side of the side wall 204 in the rotation direction of the rotor 18). I have. Thus, the discharge port 206
And by providing the suction port 208, the air blowing amount is increased in relation to the shape of the blade body 212 described later,
The cooling effect can be enhanced.

In this embodiment, a pair of ball bearings 214 and 216 are provided as a bearing structure, and a pair of ball bearings 214 and 21 are provided on the support wall 218 of the device casing 202.
The rotation shaft of the rotor 18 is rotatably supported via the shaft 6.

The blade body 212 in this embodiment has an annular end wall 220 extending radially outward from the lower end of the peripheral wall portion 24 of the rotor 18. A plurality of blade-like blades 22
2 are provided. These blades 222 linearly extend from the annular end wall 220 in the axial direction of the fan device (the vertical direction in FIG. 8).

In the fourth embodiment, the basic configuration is the same as that of the second embodiment.
The same operation and effect as those of the embodiment are achieved.

Although various embodiments of the fan device according to the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and corrections can be made without departing from the scope of the present invention. It is.

For example, in each of the above-described embodiments, the bearing structure for supporting the rotor is constituted by one ball bearing and one thrust bearing piece, but various bearing structures may be used. it can. For example, instead of a ball bearing as a radial bearing, a slide bearing such as a sleeve bearing can be used. As the sleeve bearing, like the thrust bearing piece, a synthetic resin material, a ceramic material,
It can be formed from a wear-resistant metal material or an oil-containing metal material.

In the first and second embodiments, the heat sink (cover main body) and the casing main body are assembled by a combination of the projection and the receiving recess. However, the present invention is not limited to this. It is also possible to use another means such as a hook.

[0059]

According to the fan device of the first aspect of the present invention, since the suction port and the discharge port are provided on the peripheral side wall of the device casing, the air flow is substantially in the axial direction of the fan device. The direction is vertical to the top. Therefore, there is no need for a space for sucking or discharging air above the device casing. Further, since the suction port and the discharge port are aligned in the axial direction, a sufficiently large opening can be secured even if the width of the peripheral side wall is small. Air volume can be secured. In addition, a throttle projection projecting toward the rotation path of the blade body is provided at a portion of the peripheral side wall of the apparatus casing between the discharge port and the suction port, so that the air flowing from the suction port is large. The portion is discharged from the discharge port, and the amount of air flowing downstream after passing through the throttle projection can be suppressed.

According to the fan device of the second aspect of the present invention, the air that has flowed in from the suction port is guided to the discharge port by the throttle projection, and the sucked air can be efficiently discharged from the discharge port.

According to the fan device of the third aspect of the present invention, the cooling effect can be enhanced by the cooling fins.
For example, it can be advantageously applied to a device for directly cooling an electronic component.

Further, according to the fan device of the fourth aspect of the present invention, it can be conveniently applied as a device for directly cooling electronic components.

According to the fifth aspect of the present invention, the air sucked from the suction port can be efficiently discharged from the discharge port.

Further, according to the fan device of the sixth aspect of the present invention, a large opening can be secured even if the fan device itself is thin, so that a sufficient amount of air can be secured.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a fan device according to the present invention.

FIG. 2 is an exploded perspective view showing the fan device of FIG. 1 exploded into a casing body and a heat sink.

FIG. 3 is a plan view showing a heat sink of the fan device of FIG. 1;

4 is a partially enlarged sectional view showing a thrust bearing piece mounted on the heat sink of FIG. 3 and a configuration related thereto;

FIG. 5 is a sectional view showing a second embodiment of the fan device according to the present invention.

FIG. 6 is a plan view showing a cover casing of the fan device of FIG. 5;

FIG. 7 is a sectional view showing a third embodiment of a fan device according to the present invention.

FIG. 8 is a sectional view showing a fourth embodiment of the fan device according to the present invention.

[Explanation of symbols]

2, 2A, 2B, 2C Device casing 4 Casing main body 5 Motor means 6 Heat sink 18 Rotor 26 Rotating shaft 31 Blade body 36 Rotor magnet 38 Stator 44 Heat sink main body 45, 46, 47, 48, 110, 112, 114, 1
16, 204, 208 Side wall 50, 118, 120, 210 Suction port 52, 122, 206 Discharge port 58 Cooling fin 102 Cover casing 202 Circuit board

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H05K 7/20 H05K 7/20 H

Claims (6)

[Claims] 1. An apparatus casing for defining an accommodation space,
A motor provided in the housing space; and a blade driven to rotate in a predetermined direction by the motor, wherein the device casing includes a peripheral side wall covering an outer peripheral side of the blade, and the peripheral side wall. And a pair of end walls that substantially close both end faces of the peripheral wall, a part of the peripheral side wall is formed with a suction port for sucking air and a discharge port for discharging the sucked air, The suction port and the discharge port are substantially aligned in the axial direction; and the motor means includes a stator mounted on the apparatus casing, and a rotor rotatable relative to the stator, A blade body is provided on the rotor, and a portion of the peripheral side wall of the device casing between the discharge port and the suction port viewed in a rotation direction of the blade body is directed toward a rotation path of the blade body. hand Fan apparatus characterized by stop projections and out is provided. 2. The method according to claim 1, wherein the throttle projection is provided at a position on the peripheral side wall of the device casing that defines a downstream side of the discharge port when viewed in a rotation direction of the blade. Item 7. The fan device according to item 1. 3. The fan device according to claim 1, wherein a plurality of cooling fins are provided at intervals in the suction port and / or the discharge port of the device casing. 4. The device casing comprises a casing body constituting one of the pair of end walls, and a heat sink constituting the other of the pair of end walls and the peripheral side wall. The fan device according to claim 3, wherein the cooling fin is provided on the heat sink. 5. The device casing according to claim 1, wherein the pair of end walls are rectangular, and the peripheral side wall includes four side walls provided between the pair of end walls. 5. The fan device according to claim 1, wherein the discharge port is formed, and the suction port is formed on one of side walls adjacent to a side wall on which the discharge port is formed. 6. 6. The fan device according to claim 1, wherein the suction port and the discharge port are formed over substantially the entire height of the device housing.