KR20080075319A - Cooling fan - Google Patents

Abstract

A cooling fan is provided to maximize efficiency of the cooling fan and realize close cooling by using a plurality of magnetic members on outside of the frame instead of using a motor installed to a central part of the cooling fan. An inner wheel(21) has a predetermined thickness. A wing unit(23) blows air at an inner side of the inner wheel according to rotation of the inner wheel. A plurality of magnetic members(27) such as a permanent magnet are installed on an outer side of the inner wheel at predetermined intervals. A frame(25) surrounds the inner wheel and a stator(29) is formed to the frame for electromagnetic reaction with the magnetic members. The wing unit is equipped with a plurality of wings and the wings are met at the center of the inner wheel. The stator is an electromagnet and a bearing is installed to a part contacting the inner wheel and the magnetic member. Non-conductive lubricant is coated between the frame and the inner wheel.

Description

Cooling Fan {COOLING FAN}

1 is a view showing a central axis cooling fan generally used in the prior art.

2 is a view showing a cooling fan according to an embodiment of a cooling fan according to the present invention.

3 is a view showing the rotor 20 of the cooling fan of FIG.

4 is a diagram illustrating various embodiments in which the wing part 23 of FIG. 2 is formed.

FIG. 5 is a view schematically showing the arrangement of the frame 25 and the stator 29 of FIG. 2.

6 is a view showing a cut surface of the cooling fan according to another embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

20: rotor

21: inner ring

23 wings

25: frame

27: magnetic material

29: stator

TECHNICAL FIELD The present invention relates to a cooling fan, and more particularly, to an air-cooled cooling fan for cooling overheating of electronic equipment with a flow of air.

In general, electronic equipment generates heat from a number of computing devices or light sources, and when the heat rises above a certain level, the normal operation of the electronic equipment becomes difficult and deteriorates the equipment. Therefore, electronic equipment requires a device to cool the device heat. In order to cope with the cost and noise aspects of the cooling of such electronic equipment, a lot of air-cooling fan (fan) is used. Fans, which are mainly used for cooling electronic equipment, are mainly composed of a axial fan that causes flow in the axial direction and a radial fan that causes flow in the circumferential direction.

In particular, the central fan is less noise than the radioactive fan, and the price is also low, it is widely used in noise-sensitive display equipment.

1 is a view showing a central axis cooling fan generally used in the prior art. The conventional cooling fan is composed of a frame 11, a rotary blade 13 and a drive unit 15 as shown in Figure 1 (a). When the motor in the driving unit 15 rotates, the rotary blades 13 connected to the shaft rotate to extract heat from the inside of the electronic device to the outside or introduce cold air from the outside into the inside device. FIG. 1B shows a partial cross-sectional view showing a schematic structure of the drive unit 15. The drive unit rotates the rotor 17 by the repulsive force between the stator 18 and the rotor 17, and the rotating shaft 14 connected to the rotor rotates together. The rotary shaft 14 is supported by the frame 19 by a bearing 18 or the like. Since the specific rotation principle of the driving unit is well known as a general motor operation, a detailed description thereof will be omitted.

Such a conventional cooling fan has a drive unit 15 for rotating the rotary blade 13 is located in the center of the fan by the connecting portion 15 for fixing the drive unit 15 and the rotary blade 13 to the frame of the air. In order to remove the hot spots by collecting the air volume in one place because air flow does not occur in the center of the fan by the driving unit 13, the duct must be configured or spaced at regular intervals. There was a problem. That is, the conventional fan is vulnerable to the cooling of the small area due to the complex flow characteristics by rotation.

The technical problem to be achieved by the present invention is to provide a cooling fan that can effectively cool the heat generated in the small area by removing the drive unit of the cooling fan installed in the center of the conventional cooling fan.

In order to achieve the above object, the cooling fan according to the present invention is formed on the inner ring portion having a constant thickness, the inner blade portion is formed on the inner surface of the inner ring portion to flow air in accordance with the rotation of the inner ring, on the outer surface of the inner ring portion It characterized in that it comprises a magnetic body formed at regular intervals, the frame surrounding the inner ring portion and the stator formed in the frame to electromagnetically react with the magnetic body.

Preferably, the magnetic material is made of a permanent magnet, and the wing portion includes a plurality of wings, and the wings meet at the center of the inner ring portion. Fasteners are further provided at points where the wings meet at the center of the inner ring portion.

In addition, the stator is preferably made of an electromagnet, the inner ring portion and the magnetic body has a convex donut shape with a constant radius of curvature, and the frame is formed concave with a radius of curvature formed by the inner ring portion and the magnetic body so that the inner ring portion does not escape It is desirable to.

The frame may further include a bearing in a portion where the inner ring portion and the magnetic material contact each other.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, the configuration and operation of the present invention through the embodiment of the cooling fan according to the present invention will be described in detail.

2 is a view showing a cooling fan according to an embodiment of a cooling fan according to the present invention. 2 (a) shows a perspective view of the cooling fan according to the present embodiment, and (b) is a cutaway view showing the structure of the cooling fan according to the present embodiment in more detail.

As shown in FIG. 2, the cooling fan according to the present invention has an inner ring portion 21 having a predetermined thickness, and a wing portion 23 formed on an inner surface of the inner ring portion 21 to flow air according to the rotation of the inner ring. ), A magnetic body 27 formed at regular intervals on the outer surface of the inner ring portion 21, a frame 25 surrounding the inner ring portion 21, and a stator 29 formed in the frame around the inner ring portion 21. It consists of).

The inner ring portion 21 has a wing portion 23 and a magnetic body 23 is formed in the form of a bridle having a predetermined thickness to form the rotor 20 in the cooling fan.

3 is a view showing the rotor 20 of the cooling fan. Magnetic body 27 The magnetic body 27 is formed on the outer surface of the inner ring portion 21. The magnetic body 27 functions to generate a magnetic field, and an electromagnet for generating a magnetic field may be used, but it is preferable to use a permanent magnet to minimize the volume of the device and smoothly rotate the rotor. As shown in FIG. 3, the magnetic body 27 is symmetrically formed at regular intervals on the outer surface of the inner ring portion 21 and protrudes to the outer surface of the inner ring portion 21 as shown in FIG. As illustrated in FIG. 3B, the inner ring portion 21 may be recessed to the outer surface of the inner ring part 21.

The wing portion 23 is formed on the inner surface of the inner ring portion 21. In the present invention, the wing 23 is formed inside the inner ring 21 to allow air to flow even near the center of the fan. Thus, to remove hot spots, the ducts can be cooled down to the center even in close proximity, without the need for ducts or spaced apart. 4 is a view illustrating various embodiments in which the wing is formed. As shown in FIG. 4, the wing part 23 is fixed to the inner surface of the inner ring part and is formed toward the center of the inner ring. Each wing of the wing part may or may not meet at the center. Figure 4 (a) shows the shape of the wings do not meet at the center of the inner ring, Figure 4 (b) is a view showing that the wings of the wings 23 meet at the center of the inner ring. In this case, as shown in (b) of FIG. 4, when the wings meet at the center of the inner ring, a fastener 24 for holding each wing at the center thereof may be further formed. The fastener 24 has a function of allowing the wing unit 23 to rotate stably even with strong rotation. However, if the volume of the fastener is large, the air flow in the center of the inner ring is difficult, so the volume should be minimized.

5 is a diagram schematically showing the arrangement of the frame 25 and the stator 29. The stator 29 is formed on the frame 25, and the stator 29 may be formed of an electromagnet to change a magnetic flux by winding a coil around an iron core. The stator 29 is connected to a control unit and a power source (not shown) through the conductor 30. The outer portion of the frame may be further formed with a connecting portion that can be fixed to the electronic equipment to be cooled.

The magnetic flux and electric field generated through the stator 29 and the magnetic field of the magnetic body 27 formed on the inner ring 21 generate torque, and the rotor rotates by the torque. In a specific magnetic field, the rotation algorithm is the same as that of the rotor and stator of a general motor, and thus a detailed description thereof will be omitted.

6 is a view showing a cut surface of the cooling fan according to another embodiment of the present invention. As shown in FIG. 6, in the present embodiment, the inner ring part 21 and the magnetic body 27 are formed convexly to a portion where the stator 29 is formed at a portion adjacent to the frame, and the stator 29 and the frame are formed. 25 is formed concave with the same curvature of the inner ring portion and the magnetic material to prevent the rotor 20 from protruding out of the frame even at high speed. In addition, a non-conductive lubricant may be further added between the rotor 20 and the stator 29 for smoother rotation, and a bearing may be further formed at a portion where the inner ring portion and the magnetic body contact the frame. .

As described above, the present invention can maximize the efficiency of the cooling fan by causing the flow of air in the entire region of the inner ring, including the center of the cooling fan.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

As seen above, the cooling fan according to the present invention maximizes the efficiency of the cooling fan and enables cooling in close proximity to the heating element.

Claims (8)

An inner ring portion having a constant thickness; A wing part formed on an inner side of the inner ring part to flow air according to the rotation of the inner ring; Magnetic material formed at regular intervals on the outer surface of the inner ring portion; A frame surrounding the inner ring portion; And And a stator formed in the frame to electromagnetically react with the magnetic material. The method of claim 1, The magnetic body is a cooling fan, characterized in that consisting of a permanent magnet. The method of claim 1, The wing unit has a plurality of wings, the wings are characterized in that the cooling fan in the center of the inner ring portion. The method of claim 3, wherein Cooling fan, characterized in that the fastener is further provided at the point where the wings meet in the center of the inner ring portion. The method of claim 1, Cooling fan, characterized in that the stator is made of an electromagnet. The method of claim 1, The inner ring portion and the magnetic body are convexly formed in a portion where the stator is formed in a portion adjacent to the frame, Cooling fan, characterized in that the stator and the frame is formed concave with the same curvature of the inner ring portion and the magnetic material to prevent the rotor from protruding out of the frame even at high speed rotation. The method of claim 1, The frame is a cooling fan, characterized in that the bearing is further formed in the contact portion of the inner ring portion and the magnetic material. The method of claim 1, Cooling fan, characterized in that further comprising a non-conductive lubricant between the frame and the inner ring portion.

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