Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Radially extending web or end plate
Reexamination Certificate
2001-09-28
2003-06-03
Look, Edward K. (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Rotor having flow confining or deflecting web, shroud or...
Radially extending web or end plate
C416S203000, C416S21200A
Reexamination Certificate
active
06572336
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an impeller structure, and more particularly to an impeller structure that may be made easily and may have more blades, so that the impeller has a larger blade driving face, thereby increasing the air flow rate driven by the blades.
2. Description of the Related Art
A conventional axial flow type impeller
90
in accordance with the prior art as shown in
FIGS. 1 and 2
comprises a hub
91
provided with a central shaft
92
that may be pivoted to rotate. The hub
91
is provided with a plurality of blades
93
. When the impeller
90
is rotated, the blades
93
may drive the air to flow. The conventional axial flow type impeller
90
is made of a plastic material. After the impeller ha been formed in the die, it is stripped from the die. Thus, the head and tail ends
93
a
and
93
b
of two adjacent blades
93
have to be located at the two sides of the stripping line That is, the head and tail ends
93
a
and
93
b
of any two adjacent blades
93
cannot cross the stripping line to overlap each other. The air flow rate driven by the impeller is positively proportional to the area of the blade
93
that drives the air flow. Thus, if the area of the blade
93
is to be increased, the diameter of the hub
91
has to be increased correspondingly. However, after the conventional axial flow type impeller
90
is formed in the die, it is limited by the stripping restriction. Thus, the driving area of the blade
93
cannot be increased to increase the air flow rate driven by the impeller without increasing the diameter of the hub
91
.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide an impeller structure that may increase the blade area for driving the air flow without increasing the diameter of the hub, thereby increasing the air flow rate driven by the impeller. In addition, the impeller structure may be made easily.
In accordance with the present invention, there is provided an impeller structure including a hub body having one end provided with a top plane which is provided with a central shaft. The hub body has a periphery provided with a plurality of blades. The other end of the hub body is provided with a joint portion that may be combined and secured with the extension hub which has a plurality of blades.
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: 6318964 (2001-11-01), Yang
Hong Ching-Shen
Horng Alex
Bacon & Thomas PLLC
Look Edward K.
Sunonwealth Electric Machine Industry Co. Ltd.
White Dwayne J.
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