Acoustics – Sound-modifying means – Muffler – fluid conducting type
Reexamination Certificate
2000-03-23
2003-03-18
Dang, Khanh (Department: 2837)
Acoustics
Sound-modifying means
Muffler, fluid conducting type
C181S403000, C417S312000
Reexamination Certificate
active
06533064
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a noise reduction device for use in a reciprocating compressor; and, more particularly, to a noise reduction device for use in a hermetic reciprocating compressor employed in a refrigerator, the noise reduction device incorporating therein a side-branch silencer formed in a discharge valve assembly.
DESCRIPTION OF THE PRIOR ART
Compressors often generate undesirably exceedingly high levels of noise. A certain kind of reciprocating compressor often produces noise having band ranges lower than about 4 kHz. Of the noises produced, noises having frequencies of 3.15 kHz and 2.5 kHz are most problematic because human ears are generally more sensitive to noises at these frequencies.
There is shown in
FIGS. 1
a
through
2
, one of the prior art hermetic reciprocating compressors. A main body of the compressor is mounted within a pair of cases
10
and
20
. The compressor is largely divided into a frame
30
, a motor
40
which rotates a shaft
60
and a machinery part
50
which transforms a rotational movement of the shaft
60
into a rectilinear movement of a piston
120
, allowing the piston
120
to compress refrigerant gases and discharge the same.
The frame
30
supports the motor
40
and the machinery part
50
through supporting a side stopper
70
and a coil spring
80
which function as a cushioning means and a noise attenuation means, respectively.
The machinery part
50
includes a cylinder
110
, the piston
120
rectilinearly moving within the cylinder
110
, and a piston rod
130
connecting the piston
120
to a crank
61
of the shaft
60
to transform a rotational movement of the shaft
60
into a rectilinear movement of the piston
120
. The rectilinear movement of the piston
120
within the cylinder
110
compresses refrigerant gases introduced into the cylinder
110
and discharges compressed gases therefrom.
A valve plate
140
having an intake port and a discharge port is mounted at one side of the cylinder
110
. An intake muffler
150
and a discharge muffler
160
for guiding an intake and a discharge process of the refrigerant gases, respectively, are formed outside the valve plate
140
. An intake and a discharge pipe
170
and
180
are connected to the intake and the discharge muffler
150
and
160
, respectively. The discharge muffler
160
into which the refrigerant gases are compressed to a high temperature and a high pressure are discharged from the cylinder
110
, attenuates the noise caused by a pulsation of the refrigerant gases which is discharged from the cylinder
110
.
The discharge muffler
160
is provided with a muffler plate
182
having an intake hole through which the refrigerant gases are introduced into the cylinder
110
, a discharge hole and a delivery hole (not shown), and a valve cover
184
having a first room communicating with the discharge hole and formed with an internal plate and an external plate. The discharge muffler
160
is also provided with a muffler cup
190
connected to the delivery hole of the muffler plate
182
and having a second room communicating with the delivery hole and the discharge pipe
180
connected to the muffler cup
190
, and a noise reducer
200
connected to a side of the muffler cup
190
through a connection pipe
210
.
In the discharge muffler
160
described above, when the piston
120
is reciprocated by the shaft
60
to compress the refrigerant gases, the compressed refrigerant gases are discharged through the discharge hole of the muffler plate
170
into the first room of the valve cover
184
, and then are delivered through the delivery hole, to the muffler cup
190
and finally to the discharge pipe
180
in that order. Sounds generated by the pulsation of the refrigerant gases being discharged and by the refrigerant gases colliding on valves are attenuated by the noise reducer
200
connected to the muffler cup
190
via the connection pipe
210
.
The noise reducer
200
described above, however, has shortcomings in that its efficiency in attenuating the noise is low and that it requires a large mounting space therefor in the hermetic reciprocating compressor.
SUMMARY OF THE INVENTION
It is, therefore, a primary object of the invention to provide a noise reduction device having an enhanced efficiency in attenuating a noise, especially, a noise at a particular frequency, without demanding any external mounting space for an installation thereof.
The above and other objects of the invention are realized by providing a noise reduction device for use in a hermetic reciprocating compressor, wherein the hermetic reciprocating compressor is provided with a discharge valve assembly having a discharge muffler, a gasket, a discharge valve piece and a valve plate, the discharge valve assembly being mounted on a cylinder block, the noise reduction device further comprising: a side branch silencer formed within a discharge valve assembly.
REFERENCES:
patent: 5173034 (1992-12-01), Riffle
patent: 5328338 (1994-07-01), Hirano et al.
patent: 6043187 (1985-03-01), None
patent: 61197777 (1986-09-01), None
patent: 62193187 (1987-12-01), None
patent: 2161178 (1990-06-01), None
Kim Byung Hwan
Kim Jeong Woo
Lee Kyoo Han
Daewoo Electronics Corporation
Dang Khanh
Pennie & Edmonds LLP
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