Fan with improved self-cooling capability

Details Fan with improved self-cooling capability Fan with improved self-cooling capability

2002-03-20

2004-08-10

Koczo, Michael (Department: 3746)

Pumps

Motor driven

Motor within rotary pumping member

C310S062000, C417S423800

Reexamination Certificate

active

06773239

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fan, and particularly to a fan with improved self-cooling capability.
2. Description of the Related Art
In a conventional fan, heat is generated by the internal components of the fan, such as the coils, in operation. Self-cooling heat dissipation is necessary to prevent the fan from overheating or being damaged due to the cumulative operation heat. However, the conventional fan self-cooling heat dissipation has drawbacks, as described hereafter.
FIG.
1
(
a
), FIG.
1
(
b
), FIG.
1
(
d
), FIG.
1
(
e
) and FIG.
1
(
c
) illustrate an example of a conventional fan. FIG.
1
(
a
) and FIG.
1
(
d
) shows the exploded view, FIG.
1
(
b
) and FIG.
1
(
e
) shows the cross-sectional view, and FIG.
1
(
c
) shows the top view of the conventional fan. The conventional fan has a frame
10
, a stator
20
, a magnetic ring
30
, an iron case
50
and a rotor blade impeller
60
.
The frame
10
has a base
11
in which the stator
20
is formed. The stator
20
has a plurality of coils
21
as shown in FIG.
1
(
b
). The magnetic ring
30
is positioned around the stator
20
. A cup-shaped iron case
50
is coupled to the magnetic ring
30
, and the iron case
50
is provided with several heat dissipation holes
51
and several engaging holes
52
as shown in the enlarged illustration of FIG.
1
(
d
). The heat dissipation holes
51
provided on the upper surface of the iron case
50
are positioned above the coils
21
, and the engaging holes
52
are provided around the periphery of the heat dissipation holes
51
. Further, the rotor blade impeller
60
is connected to the iron case
50
, and an opening
65
is provided on the hub
61
of the rotor blade impeller
60
in order to expose the heat dissipation holes
51
to the environment.
Since the heat dissipation holes
51
are positioned above the coils
21
in the conventional fan, the coils
21
are exposed to the environment, as shown in the top view of FIG.
1
(
c
). Thus, foreign matter such as dust or particles may directly fall onto the coils
21
, diminishing the fan's performance.
SUMMARY OF THE INVENTION
Thus, the present invention discloses a fan with improved self-cooling capability, in which foreign matter does not directly fall onto the coils of the fan.
The present invention discloses a fan with improved self-cooling capability including a frame, a stator, a magnetic ring, an iron case, and a rotor blade impeller. The frame is provided with a base and selectively formed with a plurality of guard blades. The stator is disposed on the base and provided with a plurality of coils and other components, such as a circuit board and electric components mounted on the circuit board, e.g. a driving IC and a Hall component.
The magnetic ring is magnetically coupled to the stator, which means the magnetic ring may be disposed substantially around the stator. The iron case is coupled to the magnetic ring and provided with at least a first heat dissipation hole. The rotor blade impeller has a hub, in which, in a first embodiment, at least a second heat dissipation hole aligned to the first heat dissipation hole is formed on the hub. In a second embodiment, an opening is formed on the hub and at least a heat dissipation notch aligned to the first heat dissipation hole is provided around the opening.
The rotor blade impeller is coupled to the iron case, in which the rotor blade impeller may be provided with at least an extrusion in order to couple to a part of the first heat dissipation hole of the iron case. In this case, it should be noted that the number of the first heat dissipation holes is greater than the number of extrusions.
In the present invention, the first heat dissipation hole and the second heat dissipation hole (or the heat dissipation notch) are not formed to directly alien to a position of the coils. For example, the first heat dissipation hole and the second heat dissipation hole can be formed above the magnetic ring; that is, the first heat dissipation hole and the second heat dissipation hole are not formed directly above the end of the coils. In this case, no part of the coils is directly exposed in the top view of the fan assembly, so that foreign matter does not directly fall onto the coils of the fan.
Further, the first heat dissipation hole and the second heat dissipation hole (or the heat dissipation notch) provide a heat exchange route to the outer environment, which provides for the desired self-cooling capability of the device by dissipating heat generated by the coils and other internal components. Thus, the fan of the present invention may be operated at a higher rotational speed and have a lengthened operation time.


REFERENCES:
patent: 4955791 (1990-09-01), Wrobel
patent: 6379126 (2002-04-01), Konno
patent: 6384494 (2002-05-01), Avidano et al.
patent: 6394768 (2002-05-01), Fukuda et al.
patent: 6461124 (2002-10-01), Morelli
patent: 6488483 (2002-12-01), Hsieh

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