Acoustics – Refrigerator compresssor muffler
Reexamination Certificate
2002-07-10
2004-02-17
Nappi, Robert (Department: 2837)
Acoustics
Refrigerator compresssor muffler
C181S221000, C181S229000, C181S233000, C181S237000, C181S262000
Reexamination Certificate
active
06691823
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a suction muffler in a hermetic reciprocating compressor, in particular, which provides a valve construction having distribution paths inside the suction muffler in order to facilitate the flow of refrigerant gas as well as attenuate various noises created from suction valve.
2. Description of the Related Art
As well known to the skilled in the art, compressors for converting mechanical energy into compressed energy of compressive fluid are divided into a reciprocating compressor, a scroll-type compressor, a centrifugal (turbo) compressor, a vane-type (rotary) compressor and the like.
In the reciprocating compressor (so-called hermetic reciprocating compressor) of the above compressors, a driving motor drives a crank shaft with rotating force, which is converted into linear reciprocating motion by a connecting rod connected to the crank shaft so that a piston sucks in refrigerant gas with low temperature and pressure to discharge the same after converting into the refrigerant gas with high temperature and pressure while linearly reciprocating within a cylinder.
FIG. 1
is the schematic construction of a reciprocating compressor.
Referring to
FIG. 1
, the reciprocating compressor is constituted of a hermetic vessel
110
defining a housing, a frame
120
installed inside the hermetic vessel
110
, a driving motor M installed under the frame
120
and having a stator
130
and a rotor
140
, a crank shaft
150
coupled to the inside diameter of the rotor
140
of the driving motor and having an eccentric section
151
at one end, a connecting rod
171
connected to the eccentric section
151
of the crank shaft
150
and the lower end of the piston
170
for converting the rotating force of the crank shaft
150
into linear reciprocating motion, a cylinder
160
coupled to the upper part of the frame
120
and a piston
170
connected to the connecting rod
171
coupled to the eccentric section
151
of the crank shaft
150
for linearly reciprocating inside the cylinder
160
.
The cylinder
160
is provided with suction and discharge valves
180
and
190
for sucking in and exhausting refrigerant gas, in which the suction and discharge valves
180
and
190
are respectively provided with a suction muffler
230
and a discharge plenum
240
as shown in FIG.
2
.
Referring to
FIG. 2
, in the discharge plenum
240
, the refrigerant gas compressed in high temperature and pressure through linear movement of the piston
170
is ejected via a outlet
162
and the discharge valve
190
of the cylinder
160
, and the refrigerant gas in high temperature and pressure ejected through the outlet
162
and the outlet
190
flows to the discharge pipe
241
which is installed in one side of the cylinder.
Further, the suction muffler
230
is provided with a refrigerant suction portion
231
at one side and a suction pipe
220
linearly extended from the suction portion
231
, in which the refrigerant gas changed into low temperature and pressure by an evaporator (not shown) is introduced to the refrigerant suction portion
231
, and sucked into the suction portion
161
and the suction valve
180
of the cylinder
160
.
The suction tube
220
of the suction muffler
230
is spaced from the suction tube
210
penetrating the hermetic vessel
110
with a predetermined interval so that the refrigerant gas in low temperature and pressure flowing from the evaporator is introduced into a compressor. Also shown is a refrigerant outlet
232
.
The hermetic reciprocating compressor constructed as above is operated as follows.
Referring to
FIGS. 1 and 2
, when the hermetic reciprocating compressor is energized, a current is induced between the stator
130
and the rotor
140
which are components of the driving motor M so as to rotate the rotator
140
. Rotation of the rotor
140
makes the crank shaft
150
inserted into the rotor
140
rotate in the same direction as the rotor
140
.
Rotation of the crank shaft
150
causes the connecting rod
171
connecting between the eccentric section
151
of the crank shaft
150
and the piston
170
to linearly reciprocate as well as the piston
170
to linearly reciprocate within the cylinder
160
also.
When the piston
170
linearly reciprocates like this, the refrigerant gas in low temperature and pressure ejected from the evaporator is introduced into the suction muffler
230
through the suction tube
220
of the suction muffler
230
and the refrigerant suction portion
231
.
The refrigerant gas in low temperature and pressure introduced into the suction muffler
230
is introduced into the cylinder through the suction valve
180
and the suction portion
161
mounted in the exit side, and the refrigerant gas introduced into the cylinder
160
is compressed into a high temperature and pressure by the piston
170
linearly reciprocating within the cylinder
160
.
The refrigerant gas compressed into the high temperature and pressure by the piston is ejected to the discharge plenum
240
through the outlet
162
and the discharge valve
190
of the cylinder, and the refrigerant gas discharged to the discharge plenum
240
is flown into the discharge pipe
241
installed under the discharge plenum
240
so as to circulate in a cooling cycle.
However, referring to the flow of the refrigerant gas in the suction muffler
230
of the related art as shown in
FIG. 2
, the refrigerant gas in low temperature and pressure flows backward into the suction muffler
230
from the suction valve
180
while it flows along a suction path of the refrigerant gas leading to the suction portion
161
of the cylinder
160
and the suction valve
180
through the suction muffler
230
, which is caused by suction valve closure.
In this case, the refrigerant gas flowing into the suction muffler
230
after ejected from the evaporator meets the refrigerant gas flowing backward into the suction muffler
230
from the suction valve
180
.
Accordingly, the flowing pressure of the refrigerant gas flown backward into the suction muffler
230
obstructs the new refrigerant gas ejected from the evaporator from feeding into the cylinder
160
thereby causing a problem that the cooling power of the compressor is degraded by a large amount.
Further, when the refrigerant gas ejected from the evaporator passes through the suction valve
180
via the suction muffler
230
, a complex sound pressure (noise) including vibrational noise and valve sonance produced from the suction valve and flowing noise of refrigerant gas is transferred to the refrigerant outlet
232
of the suction muffler
230
along the suction path of the refrigerant gas, i.e. a path along which the refrigerant gas is sucked to the suction portion
161
of the cylinder
160
through the suction muffler
230
and the suction valve
180
.
In this case, the complex sound pressure transferred as above is not completely attenuated in the suction muffler
230
. Accordingly, there is a problem that noise in the suction muffler
230
and the compressor is intensified. Further, the noise created in the compressor itself is transferred to the outside incurring noise pollution. In particular, there is a severe problem that the noise from the compressor may cause the compressor itself to break down.
SUMMARY OF THE INVENTION
Accordingly, the present invention has been made to solve the foregoing problems and it is an object of the present invention to provide a muffler in a reciprocating compressor which can reduce various noises produced from the flow of refrigerant and enhance the cooling ability as well as mount a floating valve within the muffler to reduce the reflow and enhance the attenuation effect of sound pressure.
The muffler of the invention is characterized in that the floating valve diverges and converges the reflowing refrigerant so that the refrigerant is converged again at a certain point after divergence to create a vortex flow thereby prevent any flow toward an inlet.
The muffler of the invention is further characterized in that th
An Kwang Hyup
Lee In Seop
Lee In Won
Lee Jeong Ho
Birch & Stewart Kolasch & Birch, LLP
LG Electronics Inc.
McCloud Renata
Nappi Robert
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