Cooling fan

Details Cooling fan Cooling fan

2001-09-24

2003-06-03

Walberg, Teresa (Department: 3742)

Pumps

Motor driven

Motor within rotary pumping member

C310S06800R

Reexamination Certificate

active

06572346

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a cooling fan, and more particularly to a dustproof cooling fan.
2. Description of Related Art
A micro cooling fan is generally assembled on an electronic element which will generate a lot of heat, such as a CPU or a video-display adapter etc., to reduce the temperature of the element. With reference to
FIG. 5
, a conventional cooling fan has a housing (
50
), a stator (
52
) and a rotator (
60
) coaxially received in the housing (
50
).
The housing (
50
) has a bottom plate (
51
) and a flange (
511
) with an opening formed at the center of the bottom plate (
51
). The stator (
52
) has a sleeve (
53
) inserted through the opening in the flange (
511
). An upper pole sheet (
54
), a coil (
55
), a lower pole sheet (
56
) and a circuit board (
57
) are in turn and coaxially provided outside the sleeve (
53
). An oil-retaining bearing (
58
) is provided in the sleeve (
53
).
The rotator (
60
) has a cap (
61
) covering the stator (
52
). A ring-like permanent magnet (
63
) is secured on an inner wall of the cap (
61
) and a bushing (
62
) is provided between the permanent magnet (
63
) and the cap (
61
). A spindle (
64
) is formed at the center of the cap (
61
) and inserted into the oil-retaining bearing (
58
). A plurality of blades (not numbered) is radially formed on an outer periphery of the cap (
61
).
In operating, the oil-retaining bearing (
58
) will emit oil to lubricate the spindle (
64
). However, there is a gap (D) between the circuit board (
57
) and the cap (
61
), by which dust can enter into the sleeve (
53
) and accumulate on the oil-retaining bearing (
58
) and the spindle (
64
). The accumulated dust blocks the oil-retaining bearing (
58
) and the oil in the bearing (
58
) cannot emit out. In this case, the spindle (
64
) will not rotate smoothly and may even be stopped.
Therefore, the invention provides an improved cooling fan to mitigate and/or obviate the aforementioned problem.
SUMMARY OF THE INVENTION
The main objective of the invention is to provide a cooling fan which can prevent dust from entering into an oil-retaining bearing.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.


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patent: 5532533 (1996-07-01), Mizutani
patent: 5729403 (1998-03-01), Schuh
patent: 5731954 (1998-03-01), Cheon
patent: 5979541 (1999-11-01), Saito
patent: 6136250 (2000-10-01), Brown
patent: 6271609 (2001-08-01), Hollenbeck et al.
patent: 6309191 (2001-10-01), Hu
patent: 6360703 (2002-03-01), Rahbar et al.
patent: 6429566 (2002-08-01), Kuwahara
patent: 6488475 (2002-12-01), Murata et al.
patent: 2002/0024264 (2002-02-01), Matsumoto
patent: 2002/0046915 (2002-04-01), Inoue et al.
patent: 3153746 (1991-10-01), None
patent: 898353 (1999-02-01), None

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