Lubrication – Systems – Rotary compressor
Reexamination Certificate
2002-05-15
2003-12-23
Fenstermacher, David (Department: 3682)
Lubrication
Systems
Rotary compressor
C415S088000
Reexamination Certificate
active
06666301
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an oil supply apparatus for a hermetic compressor, and more particularly, to an oil supplying apparatus for a hermetic compressor that is capable of increasing oil supply quantity and increasing a lubricating performance of oil.
2. Description of the Background Art
Generally, a hermetic compressor as an apparatus for compressing a fluid to supply is mainly applied to a cooling system such as a refrigerator, an air conditioner, or the like.
FIG. 1
illustrates a cross-sectional view of a hermetic compressor according to a related art.
Referring to
FIG. 1
, a hermetic compressor according to a related art includes a hermetic casing
1
providing a hermetic space inside, a motor
3
installed inside the hermetic casing
1
so as to provide a driving power, a compression unit
30
carrying out a compression of a fluid by the driving power of the motor
3
, and a oil supply apparatus
20
supplying an inside of the hermetic casing
1
with an oil so as to perform lubrication and cooling.
The motor
3
includes a stator
4
wound with a exciting coil and a rotor
5
made of a permanent magnet, thereby generating a rotating force by an electromagnetic reciprocal reaction between the stator
4
and rotor
5
.
The compression unit
30
includes a crankshaft
7
connected to the motor
3
to rotate and having an eccentric part at an upper part, a connecting rod
8
transferring a rotating force generated from a rotation of the crankshaft
7
, a piston
9
connected to the connecting rod
8
to reciprocate so as to carry out a compression of a fluid, a cylinder
6
having the piston
9
reciprocate inside and providing a compression room for compressing the fluid, and a valve assembly
10
arranged at a front side of the cylinder
6
so as to open/close the compressed fluid.
The oil supply apparatus
20
includes an oil flow path
12
formed inside the crankshaft
7
in a length direction so as to supply sliding and frictional parts inside the compressor with the oil, a sleeve
11
coupled with a lower part of the crankshaft
7
so as to rotate together with the crankshaft
7
, a sucking member
13
arranged so as to maintain a predetermined gap with an inner circumference face of the sleeve
11
and sucking the oil through the gap when the sleeve
11
rotates so as to supply the oil flow path
12
with the sucked oil, and a support bracket
14
supporting a state that the sucking member
13
is inserted in the inner circumference face of the sleeve
11
.
The sucking member
13
, of which lower part is supported by the support bracket
14
, is arranged so as to maintain a predetermined gap with an outer circumference face of the sleeve
11
as well as stop relatively inside the sleeve
11
rotation together with the crankshaft
7
. And, a spiral oil flow path is formed at an outer circumference face of the sucking member
13
so as to suck the oil along the spiral oil flow path when the sleeve
11
rotates.
The bracket
14
has a predetermined elasticity. A central part of the bracket
14
is fixed to the lower part of the sucking member
13
so as to support the sucking member
13
not to rotate. And, both extending parts of the bracket
14
from the central part are fixed to the lower part of the stator
4
.
Operation of the above-constructed oil supply apparatus in the hermetic compressor is explained as follows.
First, once the motor
3
rotates, the crankshaft
7
rotates to transfer a dynamic power to the compression unit
30
so as to compress the fluid. When the crankshaft
7
rotates by the rotation of the motor
3
, the sleeve
11
rotates while the sucking member
13
supported by the bracket
14
maintains a static state inside the sleeve
11
. Hence, the oil is sucked in along the spiral oil flow path at the outer circumference face of the sucking member
13
by the relative rotation of the sleeve
11
for the sucking member
13
.
The oil having sucked in through the sucking member
13
is carried to an upper part through the oil flow path
12
of the crankshaft
7
as well as sliding and exothermic parts of the hermetic casing
1
so as to carry out lubrication and heat dissipation.
Even if the state that the sucking member
13
is fixed to the bracket in the above-constructed hermetic compressor according to the related art, the sleeve
111
rotates together with the crankshaft
7
. When a vibration occurs in driving the compressor, the sucking member
13
is fixed but the sleeve
11
shakes due to the vibration of the compressor. Hence, it is difficult to maintain precisely the gap between the outer circumference face of the sucking member
13
and the inner face of the sleeve
11
, whereby the suction power of the oil is reduced. Thus, the frictional and sliding parts in the compressor fail to be supplied with the oil sufficiently. Hence, abrasion and damage are caused on the frictional and sliding parts so as to degrade a performance of the hermetic compressor.
Moreover, in the assembly process, the bracket
14
supports the lower part of the sucking member
13
having been inserted in the sleeve
11
, and then both ends of the support bracket
14
should be fixed to the stator
5
. Therefore, the assembly process becomes more complicated.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to an oil supply apparatus in a hermetic compressor that substantially obviates one or more problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide an oil supply apparatus in a hermetic compressor enabling to increase an oil supply performance by maintaining a precise gap between a sucking member and a sleeve in a manner that amplitudes of the sucking member and sleeve are kept equal to each other by having the sucking member of the compressor supported by the sleeve when the hermetic compressor generates vibration.
Another object of the present invention is to provide an oil supply apparatus in a hermetic compressor enabling to improve a lubrication performance, and further, a compressor performance by increasing an oil quantity supplied to frictional and sliding parts by making a sucking member revolve in a reverse direction when a sleeve rotates in a forward direction.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, an oil supply apparatus in a hermetic compressor according to the present invention includes a crankshaft coupled with a rotor of a motor so as to revolve together and having an oil flow path inside, a sleeve connected to a lower part of the crankshaft so as to revolve together with the crankshaft
107
in one body, a sucking member arranged to maintain a uniform interval with an inner circumference face of the sleeve so as to revolve in a direction opposite to that of the sleeve to carry out a suction of an oil, and a rotating force transferring means for supporting the sucking member so that the sucking member revolves together with the sleeve and receiving a rotating force of the sleeve so as to revolve the sucking member in a direction opposite to a revolving direction of the sleeve.
Preferably, the rotating force transferring means includes a sun gear connected to the sleeve so as to rotate together with the sleeve and a planetary gear geared between the sun gear and the sucking member in teeth so as to revolve along an outer circumference face of the sun gear as well as rotate and making the sucking member revolve in a direction oppo
Fenstermacher David
Fleshner & Kim LLP
LG Electronics Inc.
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