Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Plural rigidly related blade sets
Reexamination Certificate
2001-07-16
2003-04-01
Look, Edward K. (Department: 3745)
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Plural rigidly related blade sets
C415S191000, C416S19800R, C416S24400R, C361S697000
Reexamination Certificate
active
06540479
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an axial flow fan having dual rotors and dual stators so as to generate an air flow with higher pressure.
BACKGROUND OF THE INVENTION
A conventional axial flow fan for dispensing heat generated by a central processing unit of a computer is shown in FIG.
1
and generally includes a rotor
10
and a stator
11
which is located in alignment with the rotor
10
and a fan shaft rotates the rotor
10
to generate air flow by the blades on the rotor
10
. The size of the axial flow fan used to dispense the heat in the computer is limited because the modern computers are required to be thin and minimized. The heat generated by Intel Pentium 4 is 55 watts so that it requires a fan with a specification of 40×40×28 mm and is operated at 9500 rpm to generate air flow of 15 cfm. The total area of the rotor
10
and the stator
11
is limited so that it cannot generate enough air flow to properly dispense the heat. The ideal ratio of the pressure surface S
1
of the rotor
10
and the pressure surface S
2
should be slightly less than one. However, the ratio of the conventional axial flow fan is far less than one.
The present invention intends to provide an axial flow fan that generates high pressure and high of air flow rate.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided an axial flow fan which comprises a first rotor having first blades extending radially outward therefrom and a second rotor connected to the first rotor has second blades extending radially outward therefrom. A first stator has third blades extending from radially inward from an inner periphery thereof and the first rotor and the second rotor are received in the first stator with the third blades located between the first blades and the second blades. A second stator is connected to the first stator and has fourth blades extending radially inward from an inner periphery of the fourth ring.
The primary object of the present invention is to provide an axial flow fan that has larger area of blades located axially in the fan so as to produce efficient air flow with higher air flow pressure.
The other object of the present invention is to provide an axial flow fan that has less loss of air flow pressure.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention.
REFERENCES:
patent: 3241493 (1966-03-01), Frey
patent: 3574477 (1971-04-01), Dolf
patent: 5611668 (1997-03-01), Yapp et al.
patent: 6318964 (2001-11-01), Yang
Liao William C.
Yeuan Jian J.
Baxley Charles E.
Look Edward K.
McAleenan James M
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