U.S. patent application number 09/906044 was filed with the patent office on 2003-01-23 for structure of a fan.
Invention is credited to Lin, Pao Lung.
Application Number | 20030017048 09/906044 |
Document ID | / |
Family ID | 25421850 |
Filed Date | 2003-01-23 |
United States Patent
Application |
20030017048 |
Kind Code |
A1 |
Lin, Pao Lung |
January 23, 2003 |
STRUCTURE OF A FAN
Abstract
The present invention relates to an improved structure of a fan,
which is a centrifugal fan composed of a round housing and a blade
set, where each blade is spaced in equidistance and spliced in a
round housing. Each blade forms a triangular conical face on one
side and a flat face on the other face. While a fan is running, a
blade so designed functions to guide air flow and reduce turbulence
to the minimum.
Inventors: |
Lin, Pao Lung; (Taipei,
TW) |
Correspondence
Address: |
ROSENBERG, KLEIN & LEE
3458 ELLICOTT CENTER DRIVE-SUITE 101
ELLICOTT CITY
MD
21043
US
|
Family ID: |
25421850 |
Appl. No.: |
09/906044 |
Filed: |
July 17, 2001 |
Current U.S.
Class: |
415/206 ;
416/179; 416/182; 416/185; 416/223B |
Current CPC
Class: |
F04D 29/30 20130101;
F04D 29/281 20130101 |
Class at
Publication: |
415/206 ;
416/179; 416/182; 416/185; 416/223.00B |
International
Class: |
F04D 029/58 |
Claims
What is claimed is:
1. An improved structure of a fan, comprising a round housing; and
a blade set having a plurality of blades, each of the blades is
equidistantly spaced and spliced in a round housing, the blades
respectively formed with a triangular conical face on one side and
a flat face on the other side.
2. The improved structure of a fan of claim 1, wherein each of the
blades is bent in curve.
3. The improved structure of a fan of claim 1, wherein each of the
blades having a terminal end formed a bevel face.
Description
BACKGROUND OF THE INVENTION
[0001] The present invention relates to an improvement of a blade
structure of a fan in an attempt to eliminate the turbulence more
than often taking place in the centrifugal fan, guide the air
current and lessen the air resistance on a blade and lift the
working performance of a fan.
[0002] In general, a fan is operated in two modes, the axial mode
and the centrifugal mode. As for the axial mode fan, the air
current from the intake to the outlet is in the same direction and
the air flows in and out along the fan axis. That is to say, the
air current goes along the fan axis. As for the centrifugal mode
fan, the air current is blown out along the periphery of the fan,
just perpendicular to the intake air current. While the fan in
running, due to the centrifugal effect, the air current is sucked
from the central openings and propelled by the blade along the side
wall.
[0003] However, the prior art of the centrifugal fan 10a (referred
to FIGS. 1 through 3) comprises a round housing 11a and a blade
assembly 12a arranged on the periphery of the round housing 11a.
Each blade of a blade assembly 12a is spaced at equidistance and
locked in the round housing 11a. Each blade is curved, so the whole
blade assembly 12a is in the vortex form. Each blade is a long flat
strap with two flat faces on each side. While the electric fan 10a
is running, the air current generated from the blade assembly 12a
flowing along each blade will form a whirl (as shown in FIG. 3),
which diverges the regular air direction, creates air resistance,
affects the rotation of the electric fan 10a and impairs the
performance.
[0004] Viewing from the aforesaid statement, the turbulence
generated in the prior art of a fan is a substantial defect which
has to be corrected.
[0005] The inventor has dedicated great effort to the improvement
of such a defect noted, and with a theoretical application, come up
with an improved blade structure of a fan provided in the
invention.
SUMMARY OF THE INVENTION
[0006] The main object of the present invention is to provide an
improved blade structure of a fan to remove completely the
turbulence often produced in the centrifugal fan. The improved
blade further guides the air current to flow out smoothly, so the
performance of the electric fan is therefore much bettered.
[0007] To achieve the aforesaid object, the invention provides an
improved fan structure composed of a round housing with a blade set
having a plurality of blades fixed on the periphery. Each of the
blades is equidistantly spaced and spliced in the round housing.
Each of the blades is formed with a triangular conical face on one
side and a flat face on other face. The air intake will flow first
along the triangular conical face, then toward the flat face and
finally out of the fan in a smooth air dynamic line.
[0008] The drawings attached disclose an illustrative embodiment of
the present invention which serves to exemplify the various
advantages and objects hereof but place no restraint on the
invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] FIG. 1 is a stereo of the prior art of the centrifugal
electric fan.
[0010] FIG. 2 is a top view of the prior art of the centrifugal
electric fan.
[0011] FIG. 3 is a schematic diagram showing the air movement of
prior art of the centrifugal electric fan.
[0012] FIG. 4 is a stereo of the centrifugal electric fan of the
invention.
[0013] FIG. 5 is a top view of the centrifugal electric fan of the
invention.
[0014] FIG. 6 is a schematic diagram showing the air movement of
the centrifugal electric fan of the invention.
[0015] FIG. 7 is a stereo showing the electric fan of the invention
is running.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0016] Please refer to FIGS. 4 and 5, an improved structure of a
fan provided in the invention is a centrifugal fan 1, comprising a
round housing 11, a blade set 12 having a plurality of blades
arranged on the periphery of the round housing 11. Each blade of
the blade set 12 is equidistantly spaced and bent in curve form.
The whole blade set 12 is constructed in a vortex shape. Each blade
is formed with one triangular conical face 121 on one side and a
flat face 122 on the other side. Each blade having a terminal end
is formed a bevel face tangential to the concentric circle of the
round housing 11 and forms a smooth glide line with the flat face
122. Alternatively, each blade end can be made either a vertical
cut face or a round curved face.
[0017] While the electric fan 1 is running, supposing the flat face
122 of the blade is receiving the air current as shown in FIG. 6,
on the back of the front blade face 2 is a triangular conical face
121'. The air current which is sucked in will whirl along the front
blade face 2 and triangular conical face 121', then converges along
the central line toward the rear blade face 3 of the flat face
122", and eventually flows out of the fan along the flat face 122".
Similarly, the front blade face 2 of the flat face 122' is able to
guide out the air current sucked in moving toward and along the
triangular conical face 121" of the rear blade face 3. The guided
air current forms a streamlined dynamic line so as to lessen the
air resistance and accelerate the air movement.
[0018] As shown in FIG. 7, the fan 1 is locked in a fan box 4. The
fan box 4 has openings on the top cover, which guide the air into
the fan 1. When the fan 1 is in operation, the air current is
sucked in through the top openings of the fan box 4 and blown out
through a side wall to attain ventilation and heat dissipation. The
fan 1 effects the turbulence reduction. The guided air current
design improves both turbulence and noise.
[0019] In an improved blade structure of a fan provided in the
invention, each blade has a triangular conical face on the back
side, which guides the sucked air current effectively to remove the
turbulence, to reduce the air resistance and to enhance performance
of a fan. The flat face of the blade will streamline the air
current out of the fan box to gain faster and more efficient air
movement.
[0020] The invention has substantially improved the turbulence and
air resistance, which are frequently inevitable in the centrifugal
electric fan. It is a novel and advanced product, satisfying the
patent requirements and justified for a favorable grant of patent
certificate to protect the inventor's right and interest.
[0021] Many changes and modifications in the above disclosed
embodiment of the invention can, of course, be carried out without
departing from the scope thereof. Accordingly, to promote the
progress in science and the useful arts, the invention is disclosed
and is intended to be limited only by the scope of the appended
claims.
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