Pumps – Motor driven – Resiliently mounted pump or motor
Reexamination Certificate
2000-11-03
2002-08-20
Walberg, Teresa (Department: 3742)
Pumps
Motor driven
Resiliently mounted pump or motor
C417S312000
Reexamination Certificate
active
06435841
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a compressor, and more particularly, to a hermetic reciprocating compressor employed in a refrigerator or an air conditioner to compress and discharge refrigerant.
2. Description of the Prior Art
Generally, as shown in
FIG. 1
, a hermetic reciprocating compressor includes a sealed casing
10
made up of upper and lower shells
11
and
12
, an electronic device portion
20
, which is a driving source arranged in the sealed casing
10
, and a compression device portion
30
also arranged in the sealed casing
10
and driven by the driving force transmitted from the electronic device portion
20
to compress and discharge refrigerant.
The electronic device portion
20
includes a stator
21
, a rotor
22
, and a crankshaft
23
. The crankshaft
23
is press-fit to the rotor
22
and has an eccentric portion
23
a
formed on one side thereof.
The compression device portion
30
includes a cylinder block
31
having a compressing chamber
31
a
, a piston reciprocally movable in the compressing chamber
31
a
of the cylinder block
31
in a linear direction, and a connecting rod
33
disposed between the piston
32
and the eccentric portion
23
a
of the crankshaft
23
to transform and transmit the rotary movement of the crankshaft
23
to the linear reciprocal movement of the piston
32
.
In the hermetic reciprocating compressor constructed as above, when electricity is supplied, the rotary movement of the crankshaft
23
is transformed and transmitted to the linear reciprocating movement of the piston
32
. The piston
32
linearly reciprocates in the compressing chamber
31
a
of the cylinder block
31
to compress and discharge refrigerant. The high speed flow of the refrigerant produces a lot of noise. In addition, there is a lot of vibration from various valves, rotating portions, and sliding portions. In order to reduce vibration and noise produced during the operation of the compressor, the hermetic reciprocating compressor employs the following noise/vibration reducing systems.
One of the noise/vibration reducing systems employed in the hermetic reciprocating compressor is a muffler system which has a suction muffler
41
disposed in the refrigerant suction channel, and a discharge muffler
42
disposed in the refrigerant discharge channel. The muffler system significantly reduces the noise from the high-speed refrigerant flow.
Another noise/vibration reducing system is a suspension system which controls the direct transmission of the vibration produced from the electronic and compression device portions
20
and
30
to the sealed casing
10
. Such a suspension system
50
absorbs or damps the vibration produced from the electronic and compression device portions
20
and
30
by elastically and movably supporting the compression device portion
30
on the lower shell
12
of the sealed casing
10
. The suspension system
50
includes a plurality of snubbers
51
arranged on the bottom of the lower shell
12
, a plurality of protrusions
52
protruding from the lower portion of the cylinder block
31
, and a plurality of suspension springs
53
disposed between the snubbers
51
and the protrusions
52
for elastically supporting the cylinder block
31
.
The reference numeral
60
refers to a crankshaft stopper for restricting the movement of the electronic device portion
20
and the compression device portion
30
, which are elastically and movably supported within the sealed casing
10
by the suspension system
50
and are often vertically and horizontally moved during the conveyance of the compressor into contact with the inner wall of the sealed casing
10
.
By the above-described noise/vibration reducing system, noise produced during the operation of the compressor is first reduced and controlled by the muffler system and the suspension system
50
, and finally reduced and controlled by the sealed casing
10
.
In the conventional hermetic reciprocating compressor described above, however, the muffler system and the suspension system only reduce the noise and vibration to a certain degree. Since the rigidity of the sealed casing
10
is too weak, the noise and vibration control efficiency is deteriorated, and accordingly, noise from the compressor increases.
After the vibration produced from the electronic device portion
20
and the compression device portion
30
is first damped or reduced by the suspension springs
53
, the remaining vibration is transmitted to the sealed casing
10
through the snubbers
51
. Additional noise is produced from the resonance of the sealed casing
10
.
The vibration transmitted to the sealed casing
10
through the snubbers
51
is directly transmitted to the compressor without being damped or reduced, thereby contributing to and increasing the vibration and noise from the compressor.
SUMMARY OF THE INVENTION
The present invention has been made to overcome the above-mentioned problems of the prior art. It is an object of the present invention to provide a hermetic reciprocating compressor capable of lowering the noise level of the compressor by increasing the rigidity of the sealed casing with minimal changes to the design of the compressor, and thus increasing the vibration
oise controlling efficiency of the sealed casing.
Another object of the present invention is to provide a hermetic reciprocating compressor capable of damping and absorbing the vibration by dispersing the transmission paths of the vibration produced from the electronic device portion and the compression device portion and transmitted to the sealed casing. Thus, the present invention controls the resonance of the sealed casing to reduce the vibration of the compressor.
The above objects are accomplished by a hermetic reciprocating compressor according to the present invention, including: a sealed casing having an upper shell and a lower shell; an electronic device portion located in the sealed casing; a compression device portion driven by the electronic device portion to compress and discharge a refrigerant; a suspension system for absorbing or damping the vibration produced from the electronic device portion and the compression device portion by elastically and movably supporting the compression device portion on the lower shell of the sealed casing; and a casing rigidity increasing portion for exerting elasticity between the compression device portion and the lower shell, thus controlling the transmission of the noise produced from the electronic device portion and the compression device portion through the sealed casing and dispersing the vibration is transmitted to the sealed casing.
Here, the casing rigidity increasing portion is made of an elastic member which can exert elasticity between the compression device portion and the lower shell of the sealed casing, to obtain a shell rigidity similar to that which results by increasing the thickness of the shell of the compressor. Accordingly, noise and vibration controlling efficiency is increased by the sealed casing, and noise of the compressor can be reduced.
The elastic member includes a body having an annular hole in contact with the center of the bottom of the lower shell, and at least four supporting legs extending from the body which are elastically connected to a plurality of snubbers arranged on the lower shell, respectively. Accordingly, the transmission path of the vibration, which is produced from the electronic device portion and the compression device portion and transmitted to the sealed casing, is dispersed among the supporting legs, and some vibration is absorbed by the sealed casing itself. Accordingly, vibration of the compressor can be reduced.
Meanwhile, on the end of each supporting leg is a groove or connecting hole whose one end is open to permit the supporting leg to be easily fitted in the snubber. The elastic member may be made of a steel plate or a plastic material having a high vibration absorbing efficiency.
REFERENCES:
patent: 4487555 (1984-12-01), Ohinata et al.
patent: 4511314 (1985-0
Fastovsky Leonid
Ladas & Parry
Samsung Kwangju Electronics Co., Ltd.
Walberg Teresa
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