Air-bearing fan

Details Air-bearing fan Air-bearing fan

2000-02-24

2001-12-25

Tyler, Cheryl J. (Department: 3746)

Pumps

Motor driven

Motor within rotary pumping member

C417S365000, C417S423120

Reexamination Certificate

active

06332758

ABSTRACT:

BACKGROUND OF INVENTION
1. Field of the Invention
The present invention relates to an air-bearing fan. Particularly, it can be used in any element that needs air cooling or compulsive ventilation such as for the computer's CPU (central processing unit). This invention can achieve the advantages of lower noise, higher fan blade rotating speed, higher fan capacity and longer life.
2. Description of the Prior Art
The traditional fan can be seen in FIG.
1
. It includes a fan blade structure
11
, a magnet
12
, a stator
13
, a sleeve
14
, an electronic circuit board
15
, a ball-bearing
16
, a thrust spring
17
, a thrust washer
18
and a housing
19
. The function of the ball-bearing
16
is to support the fan blade structure
11
while rotating. While the fan blade structure
11
is rotating, the central shaft (not shown) of the fan blade structure
11
and the ball-bearing
16
will create a contacting friction effect. It will make noise and limit the maximum rotation speed.
While the fan blade structure
11
is rotating at a high speed, an axial thrust force is created. Because the fan blade structure
11
directly contacts the thrust spring
17
and the thrust washer
18
, it not only causes the noise, but also increases the frictional resistance. After a long period of use, the thrust spring
17
and the thrust washer
18
are possible to be worn out.
SUMMARY OF THE INVENTION
The primary object of the present invention is to provide an air-bearing fan by utilizing the air bearings to replace the traditional ball-bearing. It can reduce the contacting resistance between the shaft and the ball-bearing so as to significantly reduce the noise and increase the fan's rotating speed, fan capacity and life.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a perspective view of the disassembled prior art.
FIG. 2
is a perspective view of the disassembled present invention.
FIG. 3
is a cross-sectional view of the assembled present invention.
FIGS. 4A and 4B
illustrate the sample patterns on the surface of outer surface of the fan blade structure and the housing inner surface.
FIGS. 5A
to
5
D show the sample patterns on the surface of the thrust disk and the bottom of the housing.
FIG. 6
shows the air flowing path inside the present invention


REFERENCES:
patent: 4783608 (1988-11-01), Gruber et al.
patent: 4820950 (1989-04-01), Hijiya et al.
patent: 4955791 (1990-09-01), Wrobel
patent: 4969797 (1990-11-01), Takara et al.
patent: 5028216 (1991-07-01), Harmsen et al.
patent: 5818133 (1998-10-01), Kershaw et al.
patent: 2000/81028A (2000-03-01), None
patent: 2000-341907A (2000-12-01), None

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