Cooling fan structure

Details Cooling fan structure Cooling fan structure

2000-08-21

2002-07-09

Walberg, Teresa (Department: 3742)

Pumps

Motor driven

Electric or magnetic motor

Reexamination Certificate

active

06416300

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to an improved cooling fan structure, and more particularly to a cooling fan structure. In which, the vane assembly and the fixed base seat contact with each other at one single point and an air bearing is formed to retain the vane assembly so that almost no contact abrasion will take place and the noise is minimized and the rotational speed can be increased. The cooling fan structure is manufactured at low cost and can be easily assembled.
FIG. 1
shows a conventional cooling fan with ball bearings, including a vane structure
11
, a magnet
12
, a stator
13
, a sleeve
14
, a circuit board
15
, two ball bearings
16
, a thrust spring
17
, a thrust washer
18
and a housing
19
. The ball bearings
16
serve to retain the vane structure
11
in operation. In high speed operation, the central shaft of the vane structure
11
contacts with and abrade the ball bearings
16
. This leads to great noise and makes it impossible to increase the rotational speed.
Moreover, most of such cooling fans are used inside a computer for cooling the electronic elements so that such cooling fan has small volume (the cross-section thereof is generally smaller than the top face of the central processor of the computer, that is, smaller than 12×12 cm). As a result, the bearings employed in such cooling fan have even smaller volume. Therefore, the bearings must have very high precision so that the cost is relatively high and it is troublesome to assemble the bearings.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide an improved cooling fan structure. In which, the vane assembly and the fixed base seat contact with each other at one single point and an air bearing is formed to retain the vane assembly so that almost no contact abrasion will take place and the noise is minimized and the rotational speed can be increased.
It is a further object of the present invention to provide the above cooling fan structure that is manufactured at low cost and can be easily assembled.
The present invention can be best understood through the following description and accompanying drawings wherein:


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patent: 5893705 (1999-04-01), Khan et al.
patent: 5924851 (1999-07-01), Obata et al.

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