U.S. patent application number 09/884035 was filed with the patent office on 2002-12-26 for radiator fan with a magnetic spindle.
Invention is credited to Chu, Ching-Hung.
Application Number | 20020197175 09/884035 |
Document ID | / |
Family ID | 25383831 |
Filed Date | 2002-12-26 |
United States Patent
Application |
20020197175 |
Kind Code |
A1 |
Chu, Ching-Hung |
December 26, 2002 |
Radiator fan with a magnetic spindle
Abstract
A radiator fan has a magnetic spindle rotatably positioned in a
suspended situation between two magnetic guide seats, and a fan
propeller fixedly mounted around one end portion of the magnetic
spindle. When an alternating current runs in an inductor coil fixed
in the radiator fan provided between the magnetic spindle and a
magnet fixedly attached on the fan propeller, the fan propeller is
driven by repulsion force of an alternating magnetic field produced
by the inductor coil to run. Because the magnetic spindle is
positioned in the suspended situation between the two guide seats,
almost no frictional resistance exists between motional elements
and static elements of the radiator fan, therefore the fan
propeller runs free from noise in stable and reliable way, and the
life span of the radiator fan is greatly increased.
Inventors: |
Chu, Ching-Hung; (Hsi-Chih
City, TW) |
Correspondence
Address: |
Rabin & Champagne, P.C.
1101 14th Street, Suite 500
Washington
DC
20005
US
|
Family ID: |
25383831 |
Appl. No.: |
09/884035 |
Filed: |
June 20, 2001 |
Current U.S.
Class: |
417/423.12 ;
417/423.1 |
Current CPC
Class: |
F04D 29/057 20130101;
F04D 25/062 20130101; F04D 29/058 20130101 |
Class at
Publication: |
417/423.12 ;
417/423.1 |
International
Class: |
F04B 035/04; F04B
017/00 |
Claims
What is claimed is:
1. A radiator fan comprising: a frame (20) having an upper frame
(21) securely fixed on a lower frame (22); two magnetic guide seats
(23) respectively and securely fixed in centers of the upper and
lower frames (21, 22); a magnetic spindle (10) rotatably positioned
in a suspended situation between the two magnetic guide seats (23),
wherein each of the magnetic guide seats has a south and a north
magnetic poles at two opposed ends thereof respectively
corresponding to south and north magnetic poles of two opposite
ends of the magnetic spindle (10); a fan propeller (11) fixedly
mounted around one end portion of the magnetic spindle (10); and an
inductor coil (12) fixed in the frame (20) and provided between the
magnetic spindle (10) and a magnet (13) fixedly attached on an
inner side face of the fan propeller (11).
2. The radiator fan as claimed in claim 1, wherein the magnetic
spindle (10) has two opposite ends thereof respectively formed with
two guide posts corresponding to two guide slots respectively
defined in the two magnetic guide seats (23a).
3. The radiator fan as claimed in claim 1, wherein the magnetic
spindle (10) has two opposite ends thereof respectively defined
therein with two guide slots corresponding to two guide posts
respectively formed on the two magnetic guide seats (23).
4. The radiator fan as claimed in claim 1, wherein the magnetic
spindle (10) has a guide post and a guide slot respectively formed
on and defined in two opposite ends thereof, the two magnetic guide
seats (23a, 23) respectively have a guide slot and a guide post
provided at two opposed ends thereof corresponding to the guide
post and the guide slot of the magnetic spindle (10).
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a radiator fan having a
magnetic spindle rotatably positioned in a suspended situation
between two magnetic guide seats to enable a fan propeller to run
against almost zero frictional resistance.
[0003] 2. Description of Related Art
[0004] As shown in FIG. 5, a conventional radiator fan (50)
normally comprises a frame (51), a bearing (52) fitted in a center
of the frame (51), a spindle (55) securely fixed in an inner ring
(520) of the bearing (52), and a fan propeller (56) mounted around
a first end portion of the spindle (55).
[0005] The fan propeller (56) has a magnet (54) fixedly attached on
an inner side face thereof facing towards the spindle (55). An
inductor coil (53) is provided between the magnet (54) and an outer
ring of the bearing (52). A C-ring (57) is provided around a second
end portion of the spindle (55) to fixedly secure the spindle (55)
with the inner ring of the bearing (52).
[0006] When an alternating current runs in the inductor coil (53),
an alternating magnet field is produced by the inductor coil (53).
The magnet (54) is forced by repulsion force of the alternating
magnetic field to run around inductor coil (53) and drives the fan
propeller (56) to run about the spindle (55). Because the fan
propeller (56) is fixedly mounted around the first end portion of
the spindle (55), and the spindle (55) is fixed with the inner ring
(520) of the bearing (52), the inner ring (520) of the bearing (52)
rotates with respect to the static outer ring of the bearing
(52).
[0007] It is appreciated that due to the frictional resistance
between balls and the inner and outer rings of the bearing (52),
the running of the radiator fan (50) must produce some noise.
Furthermore, after long-term use the elements of the radiator fan
(50) become worn and aged, and the life span of the conventional
radiator fan is thus limited.
[0008] Therefore, it is an objective of the invention to provide an
improved radiator fan to mitigate and/or obviate the aforementioned
problems.
SUMMARY OF THE INVENTION
[0009] The main object of the present invention is to provide a
radiator fan, which particularly has a magnetic spindle rotatably
positioned in a suspended situation between two magnetic guide
seats. A fan propeller is fixedly mounted around one end portion of
the magnetic spindle. An inductor coil is fixed in the radiator fan
and provided between the magnetic spindle and a magnet is fixedly
attached on an inner side face of the fan propeller. When an
alternating current runs in the coil the fan propeller is driven to
turn by repulsion force of an alternating magnetic field produced
by the inductor coil. Because the magnetic spindle is positioned in
the suspended situation between the two magnetic guide seats,
almost no frictional resistance exists between motional elements
and static elements of the radiator fan, therefore the fan
propeller runs free from noise in stable and reliable way, and the
life span of the radiator fan is greatly increased.
[0010] Other objects, advantages and novel features of the
invention will become more apparent from the following detailed
description when taken in conjunction with the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 is a perspective view of a radiator fan in accordance
with the invention;
[0012] FIG. 2 is a cross sectional view of a first embodiment of
the radiator fan in accordance with the invention;
[0013] FIG. 3 is a cross sectional view of a second embodiment of
the radiator fan in accordance with the invention;
[0014] FIG. 4 is a cross sectional view of a third embodiment of
the radiator fan in accordance with the invention; and
[0015] FIG. 5 is a cross sectional view of a conventional radiator
fan.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0016] The present invention relates to a radiator fan having
almost no frictional resistance existing in a running operation
between motional and static elements.
[0017] As shown in FIGS. 1 and 2, a first embodiment of the
radiator fan in accordance with the present invention has a frame
(20) comprising an upper frame (21) fixed on a lower frame (22), a
magnetic spindle (10) rotatably fitted between the upper and lower
frames (21, 22), and a fan propeller (11) fixedly mounted around
one end portion of the magnetic spindle (10).
[0018] An inductor coil (12) is provided around the magnetic
spindle (10) and secured with the frame (20) as a static element.
The fan propeller (11) has a magnet (13) attached on an inner side
face thereof facing towards the magnetic spindle (10).
[0019] Two magnetic guide seats (23) are respectively fixed in the
upper and lower frames (21, 22) and have south and north magnetic
poles of two opposed ends thereof respectively corresponding to
south and north magnetic poles of two opposite ends of the magnetic
spindle (10). Due to the repulsion force between the like magnetic
poles of two adjacent opposed ends of the magnetic guide seats (23)
and the magnetic spindle (10), the magnetic spindle (10) is
positioned between the two magnetic guide seats (23) in a suspended
situation.
[0020] When an alternating current runs in the inductor coil (12),
an alternating magnetic field is produced by the inductor coil
(12). The magnet (13) is then forced by repulsion force of the
alternating magnetic field to run along with the fan propeller
(11). Because the fan propeller (11) is fixed with the magnetic
spindle (10), the magnetic spindle (10) runs along with the fan
propeller (11) in a motional status with respect to a static status
of the magnetic guide seats (23). Because the magnetic spindle (10)
is positioned between the two magnetic guide seats (23) in a
suspended situation, the frictional resistance between the magnetic
spindle (10) and the magnetic guide seats (23) is almost completely
eliminated.
[0021] In the first embodiment of the invention, the opposite ends
of the magnetic spindle (10) are respectively defined with two
guide sockets corresponding to two guide posts respectively formed
on the two opposed ends of the magnetic guide seats (23), whereby
the magnetic spindle (10) is rotatably positioned between the two
magnetic guide seats (23).
[0022] As shown in FIG. 3, in a second practicable embodiment of
the invention, the opposite ends of the magnetic spindle (10a) are
respectively formed with two guide posts corresponding to two guide
slots respectively defined in the opposed ends of the two magnetic
guide seats (23a), whereby the magnetic spindle (10a) is rotatably
positioned between the two magnetic guide seats (23a).
[0023] As shown in FIG. 4, in a third practicable embodiment of the
invention, the magnetic spindle (10b) has a guide post integrally
formed at a first end thereof corresponding to a guide slot defined
in a first one of the magnetic guide seats (23a), and a guide slot
defined in a second end thereof corresponding to a guide post
formed on a second one of the magnetic guide seats (23), whereby
the magnetic spindle (10b) is rotatably positioned between the two
magnetic guide seats (23a, 23).
[0024] It can be understood that the radiator fan in accordance
with the invention has a first outstanding advantage that the
magnetic spindle (10) is positioned in a suspended situation
between the two magnetic guide seats (23), almost no frictional
resistance exists between motional elements and static elements of
the radiator fan. Therefore the fan propeller runs free from noise
in stable and reliable way, and the life span of the radiator fan
is very long.
[0025] A second important advantage of the present invention is
that the structure of the radiator fan is simple, so that the
production efficiency of the radiator fan of the invention is
increased accordingly.
[0026] It is to be understood, however, that even though numerous
characteristics and advantages of the present invention have been
set forth in the foregoing description, together with details of
the structure and function of the invention, the disclosure is
illustrative only, and changes may be made in detail, especially in
matters of shape, size, and arrangement of parts within the
principles of the invention to the full extent indicated by the
broad general meaning of the terms in which the appended claims are
expressed.
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