JP3076306U - cooling fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling fan which has a non-contact friction effect, has low noise, can increase a rotation speed, has a low manufacturing cost, and is easy to assemble. SOLUTION: A fixed base base 20 is provided with a first contact portion 221 which is wear-resistant, and is parallel to a first air bearing ring surface 2.
The first ring portion 25 provided with 51 is provided. The fan blade set 30 including the magnetism generating portion 35, the central portion 31 provided with the wear-resistant second contact portion 311 and the second ring portion 33 is driven by the starter set 21 to rotate. The second ring portion 33 provided with the second air bearing ring surface 331 corresponds to the first ring portion 25, and the first contact portion 221 and the second contact portion 311 contact at a single point, and the first ring portion Has a small gap between the first air bearing ring surface 251 and the second air bearing ring surface 331 of the second ring portion, and forms a thin film of air when the fan blade set rotates. A bearing effect is produced.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a structure of a cooling fan, and more particularly, to a cooling fan utilizing characteristics of a single point contact and an air bearing.

[0002]

[Prior art]

 As shown in FIG. 1, a cooling fan having a conventional ball bearing includes a fan blade structure 11, a magnet 12, a starter 13, a fitting tube 14, a circuit board 15, two ball bearings 16, a pressing spring 17, and a pressing stop. A washer 18 and a gantry 19 are included. The ball bearing 16 is used to support the fan blade structure 11 during operation.

[0003]

[Problems to be solved by the invention]

 However, in the above configuration, the noise is large and the rotation speed cannot be increased. Because this cooling fan is used on many electronic parts inside the computer, its volume is small (the cross-section is usually smaller than the top surface of the computer CPU and smaller than about 12 cm x 12 cm). Since the bearings used in such applications have even smaller volumes, these bearings require precision, are relatively expensive, and are more complicated to assemble. Therefore, the main object of the present invention is to provide a cooling fan which has a non-contact friction effect, has low noise, can increase the rotation speed, has low manufacturing cost and is easy to assemble.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the cooling fan according to claim 1 of the present invention is provided with a starter set on a fixed base table, and a wear-resistant first contact section at the center of the base table. Is provided. A first ring portion provided with a first air bearing ring surface in parallel with the first contact portion; a magnetism generating portion; a central portion provided with a wear-resistant second contact portion; The fan blade set including the second ring portion provided with the blades is driven by the starter set to rotate. The second ring portion provided with the second air bearing ring surface corresponds to the first ring portion, the first contact portion and the second contact portion contact at a single point, and the first ring portion has a first contact portion. There is a small gap between the air bearing ring surface and the second air bearing ring surface of the second ring part, and when the fan blade set rotates, a thin film of air is formed to achieve the effect of the air bearing. Is generated.

[0005] The cooling fan according to the second aspect of the present invention is provided with a protective cover for preventing the fan blade set from being detached. In the cooling fan according to the third aspect of the present invention, one of the first contact portion and the second contact portion is formed as a flat surface, and the other is formed as a spherical surface or a convex arc surface. In the cooling fan according to the fourth aspect of the present invention, the first contact portion and the second contact portion are all spherical surfaces or convex arc surfaces.

According to the cooling fan of the present invention, the minute gap is between 5 and 40 micrometer. According to the present invention, the structure including the fixed base, the rotatable fan blade set, and the protective cover can reduce the noise, increase the rotating speed, and achieve the effect of reducing the cost and simplifying the assembly.

[0007]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The improved structure of the cooling fan of the present invention can be attached to a system unit or device that requires heat dissipation, cooling, or convection, and in particular, it is attached to the CPU of a computer to forcibly conduct convection. The invention belongs to a small cooling fan (the cross section of which is generally smaller than the top surface of the computer's CPU and smaller than about 12 cm x 12 cm).

FIGS. 2 and 3 show a first embodiment of the present invention, which mainly includes a fixed base 20, a rotatable fan blade set 30, and a protective cover 40. A starter set 21 is provided on the fixed base 20. The central portion 22 of the base table 20 is provided with a first contact portion 221 that is wear-resistant, and the central portion 22 is provided with a first ring portion 25 that is parallel (or coaxial). The first ring portion 25 has a first air bearing ring surface 251.

The fan blade set 30 is driven and rotated by the starter set 21, and the fan blade set 30 is provided with a magnetism generator 35, a central portion 31, a plurality of blades 32, and a second ring portion 33. Have been. The center portion 31 is provided with one wear-resistant second contact portion 311, the second ring portion 33 corresponds to the first ring portion 25, and the second ring portion 33 has one second air bearing. A ring surface 331 is provided.

The protective cover 40 is used to prevent the fan vane set 30 from being detached, and the protective cover 40 can be omitted depending on circumstances. There is a magnetic attraction between the magnetic generator 35 of the fan blade set 30 and the starter set 21 of the base 20. The first contact 221 and the second contact 311 contact at a single point due to the attraction. ing.

A small gap is provided between the first air bearing ring surface 251 of the first ring portion 25 and the second air bearing ring surface 331 of the second ring portion 33, and a suitable width of the gap is 5 to 5. It is between 40 micrometers. When the fan blade set 30 rotates, the gap becomes a single thin film of air, thereby producing the effect of an air bearing.

In this embodiment, the first contact portion 221 is a steel ball (or a convex arc surface molded integrally) into which abrasion-resistant is fitted, and the second contact portion 311 is a flat surface having abrasion resistance. . The first contact portion 221 and the second contact portion 311 can all take the shape of a steel ball or a convex arc.

It is also possible to provide one third ring portion 34 outside the second ring portion 33 of the fan blade set 30. A plurality of blades 32 are provided thereon. However, the gap between the first ring portion 25 and the third ring portion 34 is between the first air bearing ring surface 251 of the first ring portion 25 and the second air bearing ring surface 331 on the second ring portion 33. Larger than a small gap. It is also possible to modify the space between the first ring portion 25 and the third ring portion 34 to change the clearance. This changes the gap between the first ring portion 25 and the second ring portion 33 to a relatively large gap.

There are at least two types of installation positions of the first ring portion 25 and the second ring portion 33. The first embodiment is an inner type of a wing plate, and the second embodiment is an outer type of a wing plate. This is described in detail below. 4 and 5 show a second embodiment of the cooling fan of the present invention. The first ring portion 25 and the second ring portion 33 are all provided outside the blade 32. Similarly, the first contact portion 221 and the second contact portion 311 are in a single point contact, and the first air bearing ring surface 251 of the first ring portion 25 and the second air bearing ring surface 331 of the second ring portion 33 are provided. A small gap is formed between them, and when the fan blade set 30 is rotated, the small gap becomes a thin film of one air, thereby producing an air bearing effect.

FIGS. 6, 7, 8 and 9 show a third embodiment of the cooling fan according to the present invention. Since the second embodiment is the same as the second embodiment, detailed description of the structure is omitted. The length of the central portion 22 at which the base 20 can be separated is relatively short, and the central portion 22 is provided with a first contact portion 221 which is wear-resistant and can be hooked. This simplifies manufacturing.

One of the central portion 22 of the base 20 and the central portion 31 of the fan blade set 30 is a shaft that can be integrally formed or a shaft that can be separated. The other is a flat surface that can be formed integrally or a flat plate that can be hooked, all of which achieve the same effect and belong to the same variation of effect.

Next, one of the first contact portion 221 and the second contact portion 311 can be modified to have a convex axis or a convex conical shape (not shown in the figure). The top end is a spherical surface or a convex arc surface, the other is a corresponding concave axis or concave cone, and the bottom surface is a plane. This convex axis or convex conical portion has a function of guiding Shosuke, which also belongs to one of the same effects of the present invention.

A groove having a predetermined shape (not shown in the figure) is additionally provided between the first air bearing ring surface 251 and the second air bearing ring surface 331, and the flat surface is further increased when the air bearing is operating. I can do it in order.

[0019]

[Effect of the present invention]

 As described above, the present invention has the following advantages and effects. 1. There is no friction effect due to contact, the noise is low, and the rotation speed can be increased. The structure according to the present invention can achieve the above advantages by using only a single point of contact between the rotating fan blade plate set 30 and the fixed base table 20 and supporting them with air bearings. . 2. Low manufacturing cost and easy assembly. Since the present invention does not use the conventional ferrule 14, the two ball bearings 16, the pressing spring 17 and the pressing washer 18, the cost is reduced and the assembly becomes easier.

The above is a description of the present invention in a relatively good embodiment of the present invention, and any simple modifications and changes made to the embodiment should be considered as the scope and spirit of the present invention. Add and emphasize something.

[Brief description of the drawings]

FIG. 1 is a three-dimensional exploded view of a cooling fan having a conventional ball bearing.

FIG. 2 is a perspective view showing a configuration of the cooling fan according to the first embodiment of the present invention;

FIG. 3 is a view showing a cross section of the cooling fan according to the first embodiment of the present invention;

FIG. 4 is a perspective view showing a configuration of a cooling fan according to a second embodiment of the present invention;

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

FIG. 6 is a first perspective view showing a configuration of a cooling fan according to a third embodiment of the present invention;

FIG. 7 is a second perspective view showing a configuration of a cooling fan according to a third embodiment of the present invention;

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

FIG. 9 is an enlarged view showing a marking area in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 Base stand 21 Starter set 22 Central part 25 First ring part 30 Fan blade set 31 Central part 32 Plural blades 33 Second ring part 34 Third ring part 35 Magnetic generation part 40 Protective cover 221 First contact part 251 First air bearing ring surface 311 Second contact portion 331 Second air bearing ring surface

Claims (5)

[Utility model registration claims] 1. A starter set is provided on a fixed base base, a wear-resistant first contact part is provided at a center part of the base base, and a first air bearing ring is provided in parallel with the first contact part. A first ring portion provided with a surface, a magnetic generation portion, a central portion provided with a second wear-resistant contact portion, and a second ring portion provided with a plurality of blades The fan blade plate set having the following is rotated by being driven by the starter set, the second ring portion provided with a second air bearing ring surface corresponds to the first ring portion, and the first contact Part and the second contact part contact at a single point, and between the first air bearing ring surface of the first ring part and the second air bearing ring surface of the second ring part, the fan blades When the plate set rotates, a thin film of air is formed to create the effect of the air bearing. Cooling fan and having a gap because of the small. 2. The cooling fan according to claim 1, wherein a protective cover is provided to prevent the fan blade set from detaching. 3. The cooling fan according to claim 1, wherein one of the first contact portion and the second contact portion is formed as a flat surface, and the other is formed as a spherical surface or a convex arc surface. 4. The cooling fan according to claim 1, wherein both the first contact portion and the second contact portion are formed in a spherical surface or a convex arc surface. 5. The cooling fan according to claim 1, wherein the minute gap is between 5 and 40 micrometers.