Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Casing having tangential inlet or outlet
Reexamination Certificate
2001-09-28
2003-05-27
Look, Edward K. (Department: 3745)
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Casing having tangential inlet or outlet
C416S185000, C416S188000, C416S22300B
Reexamination Certificate
active
06568905
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fan wheel structure for a blower fan. In particular, the present invention relates to a fan wheel structure for a blower fan that drives air to flow in an improved, smoother manner.
2. Description of the Related Art
FIG. 1
of the drawings illustrates a conventional blower fan comprising a casing
90
having an axle tube
91
around which a stator
92
is mounted. A bearing
93
is mounted in the axle tube
91
for rotatably holding a central shaft
95
of a fan wheel
94
. The fan wheel
94
comprises an annular wall
98
and an annular plate
96
extending radially outward from a bottom edge of the annular wall
98
. Plural blades
97
are mounted upright on an annular outer edge of the annular plate
96
and spaced from the annular wall
98
by an appropriate gap. When the fan wheel
94
is driven to turn, air is sucked into the blower fan an exits via an outlet by the blades
97
. Such a conventional blower fan creates a suction force for driving the air by means of a turbulent flow passing through a swirl passage in the casing
90
. Therefore, the blowing effect largely depends on the smoothness of the flow. However, the joint area between the annular wall
98
and the annular plate
96
is at a right angle such that the sucked air would accumulate in the joint area and thus form turbulence.
Taiwan Utility Model Publication No. 388203, issued to Applicant on Apr. 21, 2000 and entitled AN WHEEL STRUCTURE as illustrated in
FIG. 2
of the accompanying drawings of the present application, discloses a fan wheel
80
comprising plural axial flow blades
82
and plural blower blades
83
on an outer periphery of an annular wall
81
thereof. When the annular wall
82
turns, the axial flow blades
82
drives air along an axial direction while the blower blades
83
drives air along a direction orthogonal to the axial direction.
SUMMARY OF THE INVENTION
It is the primary object of the present invention to provide a fan wheel structure for a blower fan that drives air to flow in an improved, smoother manner, thereby providing an improved blowing effect.
The fan wheel structure in accordance with the present invention comprises an annular wall, a central shaft extending along a central axis of the annular wall, an annular bottom plate extending outward from a bottom of the annular wall, and plural blades provided on the bottom plate. A joint area between the annular wall and the annular bottom plate is an annular arcuate wall to avoid interference with the air driven by the fan wheel, thereby providing a smoother airflow.
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: 3893817 (1975-07-01), Hackbarth et al.
patent: 4128364 (1978-12-01), Papst et al.
Hong Ching-Shen
Horng Alex
Bacon & Thomas PLLC
Look Edward K.
Sunonwealth Electric Machine Industry Co. Ltd.
White Dwayne J.
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