Rotary kinetic fluid motors or pumps – Bearing – seal – or liner between shaft or shaft sleeve and... – Seal
Reexamination Certificate
2002-04-29
2004-04-27
Look, Edward K. (Department: 3745)
Rotary kinetic fluid motors or pumps
Bearing, seal, or liner between shaft or shaft sleeve and...
Seal
C415S220000, C417S354000, C417S423120
Reexamination Certificate
active
06726450
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to fans having sealing devices, and particular to a fan with a device that conveniently seals lubricant in a bearing sleeve of the fan.
2. Description of the Prior Art
Referring to
FIG. 5
, a conventional electric fan
90
comprises a bearing sleeve
92
, a self-lubricating bearing
94
located in the bearing sleeve
92
, and a locking ring
96
located in the bearing sleeve
92
at one end thereof to confine the bearing
94
. A lubricant insulation ring
97
at an opposite end of the bearing sleeve
92
prevents lubricant from leaking. A rotatable central rod
98
is held in the bearing
94
.
In operation of the fan
90
, the central rod
98
rotates, and centrifugal forces act on the lubricant and cause the lubricant to leak. After assembly of the fan
90
, there is no means to check whether the locking ring
96
is still at its correct location or not. The locking ring
96
is liable to become ruined without warning, whereupon the entire fan
90
must be discarded. Many devices have good sealing apparatuses. Typical examples of such devices are disclosed in Taiwan Patent Applications Nos. 86217298 and 88204384. However, changing over the sealing apparatuses of such devices entails undue difficulty.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a fan having a sealing device that can be conveniently assembled and detached.
To achieve the above-mentioned object, a fan of the present invention includes a housing, a vane assembly, and a sealing device. The housing includes a base portion, a bearing sleeve, a self-lubricating bearing received in the bearing sleeve, and a lubricant insulation ring received in the bearing sleeve. The vane assembly is rotatably attached in the housing, with a central rod of the vane assembly extending through the bearing and the lubricant insulation ring. The sealing device is attached to the base portion such that the bearing is sealed in the bearing sleeve between the lubricant insulation ring and the sealing device. A sealing ring of the sealing device is disposed in an annular groove defined in the base portion, and is pressed tightly between the sealing lid and the base portion.
REFERENCES:
patent: 2471180 (1949-05-01), Wightman
patent: 3188153 (1965-06-01), Turk
patent: 3726575 (1973-04-01), Moorman
patent: 4955791 (1990-09-01), Wrobel
patent: 5195860 (1993-03-01), Steye
patent: 5441386 (1995-08-01), Hsieh
patent: 5610462 (1997-03-01), Takahashi
patent: 6274958 (2001-08-01), Kobayashi et al.
patent: 6278207 (2001-08-01), Matsumoto
patent: 6332763 (2001-12-01), Kohsokabe et al.
Lee Min-Chang
Zhu Xi-Jian
Chung Wei Te
Hon Hai - Precision Ind. Co., Ltd.
Look Edward K.
McAleenan J. M.
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