Housing structure of a fan

Details Housing structure of a fan Housing structure of a fan

2001-11-14

2003-05-13

Nguyen, Ninh H. (Department: 3745)

Rotary kinetic fluid motors or pumps

Working fluid passage or distributing means associated with...

Vane or deflector

C415S220000

Reexamination Certificate

active

06561762

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a housing structure of a fan, wherein the noise produced during rotation of the fan may be reduced, and rotation of the fan may produce a larger output air pressure at the air outlet.
2. Description of the Related Art
A conventional fan in accordance with the prior art shown in
FIGS. 1-3
comprises a housing
90
for combination of a stator
91
which includes a bearing
92
having a shaft hole for pivot and rotation of a rotation shaft
94
of an impeller
93
. When the impeller
93
is rotated, the blades
95
thereof may drive the air flow to move toward the air outlet of the housing
90
. The air outlet of the housing
90
is provided with multiple support rods
96
. The cross-sectional of each of the support rods
96
of the housing
90
has a semi-circular shape as shown in
FIG. 2
or a quarter-circular shape as shown in FIG.
3
. Thus, the air flow driven by the blades
95
of the impeller
93
is hindered by the support rods
96
of the housing
90
, so that the air flow will deflect along the direction as indicated by arrows. Thus, the air flow driven by the blades
95
of the impeller
93
is hindered by the support rods
96
of the housing
90
to produce a turbulence, thereby causing noise. In addition, the air flow driven by the blades
95
of the impeller
93
is hindered by the support rods
96
of the housing
90
, so that the output air pressure of the air flow driven by the blades
95
of the impeller
93
at the air outlet will be reduced.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a housing structure of a fan, wherein multiple support bars of the housing of the fan may be improved, so that the noise produced during rotation of the fan may be reduced, and rotation of the fan may produce a larger output air pressure at the air outlet.
In accordance with the present invention, there is provided a housing structure of a fan, comprising: a housing including multiple support bars supporting a seat plate with which a stator is combined, an impeller having a rotation shaft rotatably mounted in a shaft hole of the stator, each of the support bars having a first end connected to the housing and a second end connected to the seat plate, a cross-section of each of the support bars having a highest point, and having an air guide face and an air facing face respectively extended from the highest point, and a bottom face connecting the air guide face and the air facing face; the improvement comprising: the air guide face of each of the support bars is formed with a shape of an inclined face, and an acute included angle is formed between the inclined face of the air facing face and a vertical line that is vertical to a horizontal line of a bottom face of the seat plate.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.


REFERENCES:
patent: 3644066 (1972-02-01), Heob et al.
patent: 4221546 (1980-09-01), Papst et al.
patent: 4482302 (1984-11-01), Grignon
patent: 5028216 (1991-07-01), Harmsen et al.
patent: 6017191 (2000-01-01), Harmsen
patent: 6386276 (2002-05-01), Chen et al.

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