Fan with low noise, high air flow and high wind pressure

Details Fan with low noise, high air flow and high wind pressure Fan with low noise, high air flow and high wind pressure

1998-12-04

2001-05-29

Lopez, F. Daniel (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Radial flow devices

C416S19700C, C416S19700C, C416S182000, C416S183000, C416S185000

Reexamination Certificate

active

06238185

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a fan, particularly to a design of the shape of a fan and fan blades.
2. Description of the Prior Art
FIG. 1
shows the shape of a conventional fan. The conventional fan
1
comprises a center portion
11
and a plurality of fan blades
12
. According to the rotational direction F, the outermost point
1211
of the front side
121
of fan blade
12
is equal in height to the innermost point
1212
of the front side
121
. According to the rotational direction F, the front side
121
is a portion first contacting air. Because the whole face of the front side
121
first contacts air, the noise created by the conventional fan is very high. Furthermore, the wake side
122
is a plane surface such that the air contacting the fan blade can drain away from the wake side
122
, and a turbulence is easily created to reduce the air flow and the wind pressure. It is necessary to provide a fan with low noise, high air flow and high wind pressure.
SUMMARY OF THE INVENTION
It is an object of the invention to provide fan blades for minimizing the portion of the blade which first contacts air, so that the noise of the fan blade is minimized.
It is another object of the invention to provide fan blades such that the air can smoothly contact the fan blades along the surface of the fan blade to improve air flow and wind pressure.
It is still another object of the invention to provide a fan blade such that air can smoothly drain away from the fan blade to improve air flow and wind pressure.
It is further another object of the invention to provide a fan such that the diameter of the top side is smaller than that of the peripheral wall for improving the air flow entering the fan.


REFERENCES:
patent: 4722608 (1988-02-01), Salzman et al.
patent: 5226783 (1993-07-01), Mita
patent: 5320493 (1994-06-01), Shih et al.
patent: 5655884 (1997-08-01), Rose
patent: 259061 (1987-08-01), None

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