U.S. patent application number 12/579415 was filed with the patent office on 2011-04-21 for fan structure.
This patent application is currently assigned to ASIA VITAL COMPONENTS CO., LTD.. Invention is credited to Hong-Guang Li.
Application Number | 20110091314 12/579415 |
Document ID | / |
Family ID | 43879429 |
Filed Date | 2011-04-21 |
United States Patent
Application |
20110091314 |
Kind Code |
A1 |
Li; Hong-Guang |
April 21, 2011 |
FAN STRUCTURE
Abstract
A fan structure includes a base having a receiving section; a
sleeve defining a receiving space therein, and having a shaft hole
communicating with the receiving space and an engaging end for
engaging with the receiving section of the base; a bearing having
an axial bore and received in the sleeve; and an insulating rack
externally fitted around the sleeve and having a holding section
for holding at least one silicon steel plate set therein, which is
spaced from the sleeve by at least one first space. With these
arrangements, heat produced by the silicon steel plate set during
fan operation is isolated by the first space from directly damaging
the bearing. Further, since the bearing is stably held in place in
the sleeve without the need of using any bonding material, the fan
structure can have extended service life and reduced manufacturing
cost.
Inventors: |
Li; Hong-Guang; (Sinjhuang
City, TW) |
Assignee: |
ASIA VITAL COMPONENTS CO.,
LTD.
Sinjhuang City
TW
|
Family ID: |
43879429 |
Appl. No.: |
12/579415 |
Filed: |
October 15, 2009 |
Current U.S.
Class: |
415/180 ;
415/177 |
Current CPC
Class: |
F04D 29/5853 20130101;
F04D 29/646 20130101; F04D 29/057 20130101; F04D 25/062
20130101 |
Class at
Publication: |
415/180 ;
415/177 |
International
Class: |
F04D 29/58 20060101
F04D029/58; F04D 29/056 20060101 F04D029/056 |
Claims
1. A fan structure, comprising: a base including a receiving
section; a sleeve defining a receiving space therein, and having a
shaft hole communicating with the receiving space and an engaging
end for engaging with the receiving section of the base; at least
one bearing each having an axial bore and being received in the
receiving space in the sleeve; and at least one insulating rack
being externally fitted around the sleeve, and having a holding
section for holding a silicon steel plate set therein; and the
silicon steel plate set being spaced from the sleeve by at least
one first space.
2. The fan structure as claimed in claim 1, wherein the silicon
steel plate set and the insulating rack are externally wound by a
plurality of windings.
3. The fan structure as claimed in claim 1, wherein the insulating
rack includes a first receiving recess and a second receiving
recess, and the holding section being located between the first and
the second receiving recess.
4. The fan structure as claimed in claim 1, wherein the base
further includes an oil reservoir.
5. The fan structure as claimed in claim 1, wherein the bearing has
a shaft inserted therein, and the shaft having an end extended
through the shaft hole on the sleeve into the axial bore in the
bearing, and an opposing end connected to a rotor of the fan
structure.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a fan structure, and more
particularly to a fan structure having a sleeve stably holding at
least one bearing therein and being surrounded by an insulating
rack to isolate heat from the bearing.
BACKGROUND OF THE INVENTION
[0002] Most general 3C electronic products would produce a large
amount of heat during the operation of internal electronic elements
thereof. The internal electronic elements are subject to burnout
and damage when they are in a constantly high-temperature state. To
avoid the electronic elements from becoming damaged, at least one
heat dissipating unit, such as a heat radiating fin assembly or a
heat sink, and a fan device are used to dissipate the heat produced
by the electronic elements during the operation thereof, so as to
increase the service life of the electronic elements.
[0003] FIG. 1 is an exploded perspective view showing the structure
of a prior art fan 9. As shown, the fan 9 includes at least on
rotor 91, at least one stator assembly 92, at least one bearing 93,
and a frame 94. The bearing 93 has an axial bore 931; the frame 94
has a sleeve 941 for receiving the bearing 93 therein; the rotor 91
has a shaft 911 and a plurality of blades 912 spaced around the
rotor 91, and the shaft 911 is inserted into the axial bore 931 of
the bearing 93; and the stator assembly 92 includes a silicon steel
plate set 921 and a plurality of insulating plates 922. The stator
assembly 92 is directly externally fitted around the sleeve 941.
When the fan 9 operates, the silicon steel plate set 921 of the
stator assembly 92 will produce heat, and the produced heat is
transferred from the silicon steel plate set 921 to the sleeve 941,
which is fitted in the stator assembly 92. The heat is further
transferred from the sleeve 941 to the bearing 93 received in the
sleeve 941. When the bearing 93 is heated, lubricating oil
contained in the bearing 93 is evaporated, resulting in dry
friction between the shaft 911 and the bearing 93 to damage the fan
9.
[0004] Therefore, the prior art fan structure has the following
disadvantages: (1) having short service life; and (2) heat being
easily accumulated at the bearing and the sleeve.
SUMMARY OF THE INVENTION
[0005] A primary object of the present invention is to provide a
fan structure that is able to isolate heat produced during the fan
operation from a bearing of the fan, so that the bearing is not
damaged by the heat.
[0006] Another object of the present invention is to provide a fan
structure that is able to stably and accurately hold a bearing in
place.
[0007] To achieve the above and other objects, the fan structure
according to the present invention includes a base, a sleeve, at
least one bearing, and at least one insulating rack. The base
includes a receiving section. The sleeve defines a receiving space
therein, and has a shaft hole communicating with the receiving
space and an engaging end for engaging with the receiving section
of the base. The bearing has an axial bore and is received in the
receiving space in the sleeve. The insulating rack is externally
fitted around the sleeve and has a holding section for holding at
least one silicon steel plate set therein. The silicon steel plate
set is spaced from the sleeve by at least one first space. With the
insulating rack being directly fitted around the sleeve and the
silicon steel plate set being spaced from the sleeve by the first
space, heat produced by the silicon steel plate set during the
operation of the fan is isolated by the first space from directly
damaging the bearing. Further, since the bearing is enclosed and
stably held in place in the sleeve without the need of using any
bonding material, the fan structure can have extended service life
and reduced manufacturing cost.
[0008] In brief, the fan structure of the present invention has the
following advantages: (1) having extended service life; (2)
allowing the bearing to accurately located in place; (3) saving the
cost for bonding material; and (4) isolating the bearing from
heat.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The structure and the technical means adopted by the present
invention to achieve the above and other objects can be best
understood by referring to the following detailed description of
the preferred embodiments and the accompanying drawings,
wherein
[0010] FIG. 1 is an exploded perspective view of a conventional fan
structure;
[0011] FIG. 2 is an assembled sectional view of a fan structure
according to an embodiment of the present invention; and
[0012] FIG. 3 is an exploded sectional view of FIG. 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0013] Please refer to FIGS. 2 and 3 that are assembled and
exploded sectional views, respectively, of a fan structure
according to an embodiment of the present invention. As shown, the
fan structure includes a base 1, a sleeve 2, at least one bearing
3, and at least one insulating rack 4. The base 1 includes a
receiving section 11. The sleeve 2 defines a receiving space 21
therein, and has a shaft hole 22 communicating with the receiving
space 21 and an engaging end 23 for engaging with the receiving
section 11 of the base 1. The bearing 3 has an axial bore 31, and
is received in the receiving space 21 in the sleeve 2. The
insulating rack 4 is externally fitted around the sleeve 2, and has
a holding section 41 for holding at least one silicon steel plate
set 6 therein. The silicon steel plate set 6 and the sleeve 2 is
spaced from each other by at least one first space 25. The
insulating rack 4 is directly fitted around the sleeve 2, and used
to hold the silicon steel plate set 6 thereto. Since the silicon
steel plate set 6 is spaced from the sleeve 2 by the first space
25, heat produced by the silicon steel plate set 6 during the
operation of the fan is isolated by the first space 25 from
directly damaging the bearing 3. Further, since the bearing 3 is
enclosed in the sleeve 2, the bearing 3 is stably held in place in
the sleeve 2 without the need of using any bonding material to save
the cost therefor. Thus, the fan structure of the present invention
can have extended service life and reduced manufacturing cost.
[0014] The bearing 3 has a shaft 5 inserted therein. The shaft 5
has an end extended through the shaft hole 22 on the sleeve 2 into
the axial bore 31 of the bearing 3, and an opposing end connected
to a rotor 7 with a plurality of blades 71. The shaft 5 is tightly
fitted in the axial bore 31 of the bearing 3 and then disposed in
the sleeve 2. The shaft hole 22 and the axial bore 31 are
communicable with each other. The engaging end 23 is located at an
end of the sleeve 2 opposite to the end with the shaft hole 22. The
base 1 further includes at least one oil reservoir 12.
[0015] The insulating rack 4 further includes a first receiving
recess 42 and a second receiving recess 43. The holding section 41
is located between the first and the second receiving recess 42,
43. A plurality of windings 24 is wound the insulating rack 4 in
the first and the second receiving recess 42, 43.
[0016] The present invention has been described with a preferred
embodiment thereof and it is understood that many changes and
modifications in the described embodiment can be carried out
without departing from the scope and the spirit of the invention
that is intended to be limited only by the appended claims.
* * * * *