JP2550683Y2 - Heat sink fan - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sink fan having a small fan motor.

[0002]

2. Description of the Related Art Small fan motors are widely used, for example, for various devices such as OA equipment, medical equipment, research and experiment equipment, and other devices for preventing heat generation in equipment incorporating many electronic components. ing.

FIGS. 3 and 4 show an example of application as a device for preventing heat generation. In these figures, a fan motor 1 includes an upper casing 2 having a rectangular planar shape,
Similarly, an axial fan motor having a lower casing 3 having a rectangular planar shape and a driving portion including a propeller-shaped impeller 4 housed in the upper casing 2. The upper casing 2 and the lower casing 3 define a space in which the drive part rotates.

The upper casing 2 has a plurality of openings 5 around the upper surface through which air can freely flow, and blind holes 6 at four corners.
(See FIG. 4).
On the other hand, the lower casing 3 is a heat sink, and has a heat sink fin portion 9 rising from the periphery of the heat sink bottom portion 8 having a blind bottom or a circular or other punched window (not shown) as shown in the drawing, and a heat sink fin 9 at each of the four corners. And a connecting portion 11 having a protruding portion 10 that is received in the blind hole 6 of the upper casing 2.

The impeller 4 includes a bowl-shaped rotating member 12, a plurality of blades 13 protruding from the outer periphery of the bowl-shaped rotating member 12,
One end of a rotating shaft 14 is fitted into a through hole provided in the center of the bowl-shaped rotating member 12, and the rotating shaft 14
Is rotatably supported via a bearing 15 in a cylindrical recess provided at the center of the upper casing 2. A rotor magnet 16 is attached to the inner peripheral surface of the bowl-shaped rotating member 12 via a yoke, and the bowl-shaped rotating member 12, the yoke, and the rotor magnet 16 form a rotor 17.

Further, a cylindrical core provided in the center of the upper casing 2 has a stator core having a plurality of teeth arranged along a circumferential direction, a coil wound around the teeth of the stator core, The stator 18 is externally fitted. When using the fan motor 1
Heat sink bottom 8 of lower casing 3 constituting
Is placed in contact with a component 20 such as an IC disposed on the substrate 19.

Next, the fan motor 1 is connected via the power line 21.
When the is rotated, the impeller 4 of the driving portion rotates, and an air flow path is formed in the axial direction in the drawing, for example, through the opening 5 of the upper casing 2 from the heat sink fin 9 through the heat sink bottom 8 of the lower casing 3. You. In this way, the heat generated from the IC component 20 and the like is sufficiently dissipated, and this greatly contributes to preventing damage to the component and the like.

Further, for example, when air flows from the fin side of the lower casing to the opening of the upper casing, the dust is blocked off outside the fins, so that it is possible to prevent the dust from entering the inside of the casing. It is also easy to remove dust adhering to the casing of the fan motor.

[0009]

As described above, the conventional fan motors themselves provide extremely efficient working characteristics. However, miniaturization of fan motors has progressed, and accordingly, fan motor casings have been considerably reduced. Therefore, since the surface area of the heat sink that dissipates heat is reduced, the amount of heat dissipated by the heat sink is limited. However, if heat is not reliably dissipated, the heat generated from the IC components may have a bad influence on itself.

The present invention has been made to solve the above problems, and has as its object to provide a heat sink fan having a heat sink having a high heat radiation effect even with a small fan motor.

[0011]

In order to achieve the above object, a heat sink fan according to the present invention comprises a fan motor,
A fan motor mounting casing having this fan motor mounted and one end of which is open and having a rectangular planar shape, and a casing having a rectangular planar shape attached to the opening edge of the casing in a lid shape, the latter The casing is a heat sink for heat dissipation, and grooves are provided on the inner bottom surface of the heat sink.

[0012]

In the present invention, grooves are provided on the inner bottom surface of the heat sink to increase the surface area of the heat sink.
The heat radiating effect of the heat sink is further enhanced, and the adverse effects of heat on IC components and the like are prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show an embodiment of the present invention.

The difference between the fan motor 30 of this embodiment shown in FIGS. 1 and 2 and the known fan motor 1 shown in FIGS.
That is, Other points, for example, the configuration of driving parts such as an impeller, a rotor magnet, a rotor, and a stator attached to the upper casing 32, and a method of attaching them, a heat sink fin portion 50 of the lower casing 36, and the upper casing 32 There is no substantial difference in the method of assembling the lower casing 36 and the lower casing 36.

The upper casing 32 is made of a synthetic resin material, and has a substantially rectangular planar shape. Further, a connecting portion 48 is provided on the lower surface side of each corner of the upper casing 32, and a projecting portion 4 provided on a lower casing 36 described later is provided on the lower surface side of the connecting portion 48.
A blind hole 52 is formed for receiving the hole 4.

On the other hand, similarly to the known lower casing 3 shown in FIG. 3, a lower casing 36 made of a heat conductive material such as aluminum die cast is provided at a heat sink bottom 46 and at four corners of the heat sink bottom 46. The protrusions 44 having substantially the same diameter and the heat sink bottom 4 are provided.
6, and a heat sink fin portion 50 provided between the four connecting edges 42 and rising from the four side edges.

Heat sink bottom 4 of lower casing 36
6 has a thickness of 2 mm, and a groove 1 having a depth of 1 mm is provided on the entire surface of the heat sink bottom 46. Groove 54
Are on the extension of the gap between the fins of the heat sink fin portion 50 rising from the peripheral wall of the heat sink bottom portion 46. That is, the heat sink fin portion 50 is formed by cutting the peripheral wall of the lower casing 36 with a plurality of parallel cutters. In this case, two opposing walls of the peripheral wall of the lower casing 36 are cut by one feed of the cutter, and the heat sink fins 5 are formed.
0 is formed. Then, the heat sink fin portion 5
At the time of forming 0, a part of the cutter is guided to the heat sink bottom 46 to form a parallel groove in one direction among the lattice-shaped grooves 54. Further, the heat sink fin portion 50 on the peripheral wall of the other lower casing 36 and the parallel groove perpendicular to the parallel groove are formed in the same manner as described above.

Accordingly, the protrusions 56 having a height of 1 mm and appearing by providing the grooves 54 are arranged side by side on the extension of the heat sink fin 50. In this manner, by providing the groove 54 in the heat sink bottom 46, the surface area of the heat sink bottom 46 that radiates heat is expanded.

Upper casing 32 and lower casing 36
When assembling, first, the upper casing 32 in which driving parts such as an impeller, a rotor magnet, a rotor, and a stator are attached in advance by a known procedure, a blind hole 52 of the upper casing 32 is formed on the lower casing 36. The lower casing 36 is disposed at a position facing the projecting portion 44. Next, the two casings 32 and 36 are brought close to each other, and the protrusion 44 of the lower casing 36 is inserted into the blind hole 52 of the upper casing 32. Thus, the blind hole 52 of the upper casing 32 and the projection 44 of the lower casing 36
Thus, both casings are accurately positioned.

In this embodiment, the blind hole 52 is formed in the upper casing 32 and the projection 44 is formed in the lower casing 36.
However, this is not an essential requirement, and it is natural that a protrusion may be provided on the upper casing and blind holes may be provided on the lower casing, or vice versa, if necessary. . Further, the upper casing and the lower casing can be assembled in an upside-down position, and the drive portion can be provided in the lower casing.

The grooves 54 formed in the bottom portion 46 of the heat sink of the lower casing 36 are not limited to this embodiment, and can be freely deformed. The method of forming the grooves is not limited to cutting, and a mold can be used. That is, when the lower casing 36 including the heat sink fin part 50 is cast and formed by aluminum die casting or the like, the above-described groove 54 may be formed at the same time. Alternatively, a groove on the inner bottom surface of the lower casing 36 can be formed by stamping.

[0022]

As described above, in the present invention, since the groove is provided on the inner surface of the bottom of the heat sink, the surface area of the heat sink is increased. Therefore, the amount of heat radiation increases as the heat radiation area increases, and the heat radiation effect of the heat sink can be enhanced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a heat sink fan showing an embodiment of the present invention.

FIGS. 2A and 2B show a lower casing of FIG. 1, wherein FIG. 2A is a plan view and FIG.

FIG. 3 is an exploded perspective view of a conventional heat sink fan.

FIG. 4 is a sectional view of a conventional heat sink fan.

[Explanation of symbols]

 Reference Signs List 30 fan motor 32 upper casing 36 lower casing 42 connecting part 44 projecting part 46 heat sink bottom part 48 connecting part 50 heat sink fin part 52 blind hole 54 groove 56 protrusion

Claims (1)

(57) [Scope of request for utility model registration] 1. A fan motor, a fan motor mounting casing on which the fan motor is mounted, one end of which is open, and a planar shape which is rectangular, and a planar shape which is mounted in a lid shape on an opening edge of the casing. A heat sink for radiating heat, wherein a groove group is provided on an inner bottom surface of the heat sink.