Supercharging structure for a fan

Details Supercharging structure for a fan Supercharging structure for a fan

2001-09-28

2003-04-15

Thorpe, Timothy S. (Department: 3746)

Pumps

Motor driven

Electric or magnetic motor

C417S423500, C417S423800, C417S424100, C415S211200, C415S208200, C361S695000, C361S697000

Reexamination Certificate

active

06547540

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a supercharging structure for a fan, wherein the thickness of the casing of the fan can be varied in response to a change in the height of the fan wheel while providing an airflow driven by the axial flow fan with a relatively high blast pressure on the air outlet side.
2. Description of the Related Art
U.S. Pat. No. 6,244,818 to Chang issued on Jun. 12, 2001 discloses a fan guard structure for additional supercharging function. As illustrated in
FIG. 1
of the drawings that corresponds to
FIG. 2A
of U.S. Pat. No. 6,244,818, the fan guard
90
comprises a motor holder
91
and plural radial guard blades
92
. A rotor device is mounted to the motor holder
91
and comprises a motor
93
for driving a shaft ring (fan wheel)
94
. When the fan wheel
94
turns, surrounding air is introduced by the rotor blades
95
to generate an airflow which is outputted after passing through gaps between the guard blades
92
. The blast pressure is changed from a relatively low value on the air inlet side into a relatively high value on the air outlet side. That is, there is a blast pressure enhancement on the air outlet side.
As illustrated in
FIG. 2
that corresponds to
FIG. 7
of U.S. Pat. No. 6,244,818, a composite fan comprises two fan units
90
each including guard blades
92
and the rotor device mentioned above, which also fulfills the function of improving performance of the fan.
The fan disclosed in U.S. Pat. No. 6,244,818 has a fixed thickness (or height), as the thickness of the casing
90
and of the fan wheel
94
is fixed. Thus, factories manufacturing the fans must prepare molds for manufacturing casings
90
of various thicknesses. In addition, spare products are required for different needs.
Furthermore, mounting of the motor
93
, fan wheel
94
, and drive circuit of the rotor device into the casing
90
becomes difficult when the casing
90
is relatively thick. Further, inconvenience was found when mounting the fan disclosed in U.S. Pat. No. 6,244,818 on a heat-dissipating member, which is the most common use of the fan.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a supercharging structure for a fan, wherein the thickness of the casing of the fan can be varied in response to a change in the fan wheel.
Another object of the present invention is to provide a supercharging structure for a fan, wherein the rotor device of the fan can be assembled easily.
A further object of the present invention is to provide a supercharging structure for a fan, wherein the fan can be directly engaged with a heat-dissipating member to thereby form a heat-dissipating unit.
A fan having a supercharging structure comprises a casing having an air passage hole with an air inlet at a first end thereof and an air outlet at a second end thereof. A base is mounted to the air outlet end of the casing. A supporting plate is mounted in the air passage hole of the casing or in an air outlet in the base for engaging with a stator bobbin that pivotally holds a fan wheel to be driven. Plural supercharging plates are mounted between the supporting plate and the base.
Other objects, specific advantages, and novel features of the invention will become more apparent from the following detailed description and preferable embodiments when taken in conjunction with the accompanying drawings.


REFERENCES:
patent: 4080096 (1978-03-01), Dawson
patent: 6017185 (2000-01-01), Kuo
patent: 6244818 (2001-06-01), Chang
patent: 6386276 (2002-05-01), Chen et al.
patent: 6388880 (2002-05-01), El-Ghobashy et al.
patent: 6407919 (2002-06-01), Chou
patent: 2002/0018336 (2002-02-01), Liang et al.
patent: 2002/0060900 (2002-05-01), Qiu

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