Pumps – With muffler acting on pump fluid
Reexamination Certificate
1999-09-09
2001-11-06
Walberg, Teresa (Department: 3742)
Pumps
With muffler acting on pump fluid
C417S313000
Reexamination Certificate
active
06312233
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rotary compressor, and more particularly, to a rotary compressor which can attenuate a noise generated in operation of the rotary compressor and improve lubrication.
2. Background of the Related Art
The compressor for compressing air or gas to a required pressure is used in an air conditioner or the like for compressing a refrigerant gas to a required pressure.
A related art rotary compressor will be explained with reference to
FIGS. 1 and 2
.
The related art rotary compressor is provided with a hermetic case
1
having a suction pipe
16
for drawing refrigerant and a discharge pipe
5
for discharging the compressed refrigerant, both connected thereto respectively, a driving unit
6
in the case
1
for providing a rotating force, and a compression unit
10
for compressing the refrigerant. The driving unit
6
has a stator
2
and a rotor
3
of a motor disposed at an upper portion in the case
1
. The rotor
3
is coupled to a shaft
4
for transmission of the rotating power to the compression unit
10
. The rotor
3
has an eccentric portion
4
a
at a lower portion thereof. The compression unit
10
has a compression chamber ‘C’ enclosed by a cylinder
11
forming a wall of the compression chamber ‘C’, and a main bearing
14
and a supplementary bearing
15
mounted at an upper side and a lower side of the compression chamber ‘C’ respectively. The compression chamber ‘C’ has the suction pipe
16
connected thereto for receiving refrigerant from outside of the compression chamber ‘C’. The cylinder
11
and the main bearing
14
have a discharge opening
11
a
and a discharge passage
14
b
formed therein respectively for discharging refrigerant, which discharge passage
14
b
is opened/closed by a valve(not shown). In the meantime, the eccentric portion
4
a
of the shaft is mounted in the compression chamber ‘C’, i.e., inside of the cylinder
11
. There is a roller
12
fitted to an outside of the eccentric portion
4
a
for making a compression action as the eccentric portion
4
a
keeps making contact with an inside surface of the cylinder
11
following rotation of the eccentric portion
4
a.
And, there is a vane
13
mounted in the cylinder
11
to be always in contact with an outside of the roller
12
biased by a spring for dividing the compression chamber ‘C’ into a high pressure portion and a low pressure portion. There is a muffler
20
above the main bearing
14
for attenuation of noise, which has a muffler discharge opening
21
for discharging refrigerant flowed into the muffler
20
to an outside of the muffler
20
.
The muffler will be explained with reference to
FIGS. 3A-3B
.
The muffler
20
in a form of a cap has a boss hole
22
at a center for passing a boss portion
14
a
of the main bearing
14
, and recessed bolt fixing parts
23
in an outer circumference thereof. The muffler
20
has a muffler discharge opening
21
formed at a position between an inside diameter and an outside diameter for discharging the compressed gas flowed into the muffler
20
.
In the meantime, lubrication oil is applied to various components of the compressor for smooth operation. That is, a pump(not shown) draws lubricating oil stored on a bottom of the case
1
and supplies to between the main bearing
14
or the supplementary bearing
15
and the shaft
4
through a hollow
4
b
in the shaft
4
. As the lubrication oil and the refrigerant are mixed in a process of refrigerant circulation, and discharged to outside of the compressor, there is an accumulator
30
provided on the suction pipe
16
side of the compressor for separating and recovering the lubrication oil.
The operation of the related art rotary compressor will be explained with reference to
FIGS. 1 and 2
.
Upon starting the rotary compressor, the rotor
3
of the motor is rotated, to rotate the eccentric portion
4
a
of the shaft, eccentrically rotating the roller
12
inside of the cylinder
11
in a state the roller
12
is in contact with the vane
13
. The eccentric rotation of the roller
12
reduces a volume of the compression chamber ‘C’, compressing low pressure refrigerant flowed into the compression chamber ‘C’ through the suction pipe
16
to a required pressure. Following operation of the valve, the compressed high pressure refrigerant is discharged into the muffler
20
above the main bearing
14
through the cylinder discharge opening
11
a
and the discharge passage
14
b
in the main bearing. The high pressure refrigerant thus discharged into the muffler
20
is discharged outside of the muffler
20
through the muffler discharge opening
21
. And, the high pressure refrigerant discharged outside of the muffler
20
is discharged outside of the rotary compressor through the discharge pipe
5
on top of the case
1
through gaps between the rotor
3
and the stator
2
or the case
1
and the stator
2
. And, the high pressure refrigerant discharged outside of the compressor through the discharge pipe
5
is circulated through a refrigerating cycle to flow into the compressor again through the suction pipe
16
.
However, the related art rotary compressor has the following problems.
First, because a pressure fluctuation and a kinetic turbulent energy contained in the compressed refrigerant is discharged without being consumed fully, noise can not be attenuated, effectively. And, a size of noise generation is directional depending on a position of a muffler discharge opening formed in the muffler. Moreover, the related art muffler has a limitation in attenuating the noise for a large sized compressor because the pressure fluctuation of the compressed refrigerant is substantial.
Second, since the hollow in the shaft merely serves in supplying lubricating oil to the main bearing and the supplementary bearing, and the lubricating oil supply fully depends on the pump, an overall compressor efficiency is dropped.
Third, because the high pressure refrigerant compressed in the compression chamber flows into the muffler through a discharge passage formed in one side of the main bearing, exerting an eccentric load to the shaft, a lifetime of the shaft is shortened.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a rotary compressor that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
One object of the present invention is to provide a rotary compressor which can improve a noise attenuation performance.
Other object of the present invention is to provide a rotary compressor which can improve a lubrication for improving a compressor performance.
Another object of the present invention is to provide a rotary compressor which can prolong a lifetime of the shaft.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will 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 and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, the rotary compressor including a main bearing which is a component for forming a compression chamber having a discharge passage for discharging a compressed gas and a boss for inserting a shaft of a motor therethrough, and a muffler on a top of the main bearing having a boss hole for passing the boss of the main bearing therethrough and provided for attenuation of a noise, wherein the muffler has no separate refrigerant discharge opening, the boss of the main bearing has a plurality of first discharge openings, and the shaft has a hollow and a plurality of second discharge openings in communication with the first discharge openings.
There is a lubrication cavity between the first discharge openings in the main bearing and the second dischar
Ahn Byung Ha
Kim Young Jong
Lee Jang Woo
Fleshner & Kim LLP
LG Electronics Inc.
Van Quang
Walberg Teresa
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