Pumps – Motor driven – Resiliently mounted pump or motor
Reexamination Certificate
2000-11-03
2002-07-23
Freay, Charles G. (Department: 3746)
Pumps
Motor driven
Resiliently mounted pump or motor
C417S415000, C417S902000
Reexamination Certificate
active
06422833
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 for compressing and discharging refrigerant in a refrigerator or an air conditioner, etc.
2. Description of the Prior Art
Generally, as shown in
FIG. 1
, a conventional hermetic reciprocating compressor includes a sealed casing
10
, an motor portion
20
, a compression device portion
30
, an elastic supporting portion
40
, and a crankshaft stopper
50
.
The sealed casing
10
includes upper and lower shells
11
and
12
, respectively, which are substantially hemispheric in shape. The sealed casing
10
accommodates the motor portion
20
, compression device portion
30
, elastic supporting portion
40
, and the crankshaft stopper
50
.
The motor portion
20
includes a stator
21
, rotor
22
, and crankshaft
23
. The crankshaft
23
is press-fit to the rotor
22
and includes 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
32
reciprocally movable within the compressing chamber
31
a
of the cylinder block
31
, 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
into a linear reciprocal movement of the piston
32
.
The elastic supporting portion
40
absorbs and damps various vibrations generated during operation of the compressor by elastically supporting the cylinder block
31
of the compression device portion
30
toward the lower shell
12
of the sealed casing
10
. Such an elastic supporting portion
40
includes a plurality of snubbers
41
arranged on the bottom surface of the lower shell
12
, a plurality of protrusions
42
protruding from the lower portion of the cylinder block
31
, and a plurality of suspension springs
43
disposed between the snubbers
41
and the protrusions
42
for elastically supporting the cylinder block
31
.
The motor portion
20
and the compression device portion
30
can move vertically and horizontally during conveyance of the compressor into contact with the inner wall of the sealed casing
10
. The crankshaft stopper
50
restricts the movement of the motor portion
20
and the compression device portion
30
, both of which are elastically and movably supported in the sealed casing
10
by the elastic supporting portion
40
. The crankshaft stopper
50
is welded onto the inner upper side of the upper shell
11
and includes a movement restricting hole
51
, into which an upper end of the crankshaft
23
is inserted. Since the upper end of the crankshaft
23
is received and supported in the movement restricting hole
51
of the crankshaft stopper
50
, movement of the motor portion
20
and the compression device portion
30
is limited. Accordingly, possible deformation and breakage of compressor components by contact with the inner wall of the sealed casing
10
during wide horizontal and vertical movements of the electronic device portion
20
and the compression device portion
30
during the operation of the compressor are, prevented.
In the conventional hermetic reciprocating compressor such as that described above when electricity is supplied, rotary movement of the crankshaft
23
is transformed and transmitted into linear reciprocal movement of the piston
32
through the connecting rod
33
. The piston
32
linearly reciprocates within the compressing chamber
31
a
of the cylinder block
31
to compress and discharge a refrigerant. The high-speed refrigerant flow and vibrations from various parts of the motor portion
20
and the compression device portion
30
inevitably produce noise. The suction and discharge mufflers
13
and
14
reduce the noise from the refrigerant flow, while the elastic supporting portion
40
absorbs and damps the vibrational noise.
In the conventional hermetic reciprocating compressor, however, the suction muffler
13
, discharge muffler
14
, and the elastic supporting portion
40
only reduce the noise produced during the operation of the compressor to a certain extent. The noise of the compressor remains high due to lack of structure for reducing transmission noise that is caused from the resonance of the sealed casing
10
.
SUMMARY OF THE INVENTION
The present invention has been made to overcome the above-mentioned problems of the prior art, and accordingly, it is an object of the present invention to provide a hermetic reciprocating compressor for reducing the noise level of the compressor by reducing transmission noise caused by resonance of a sealed casing.
Another object of the present invention is to provide a hermetic reciprocating compressor capable of reducing the transmission noise caused by resonance of the sealed casing by making simple changes to the existing structure without changing the design of the compressor itself.
The above objects are accomplished by a hermetic reciprocating compressor according to the present invention having a resonance reducer portion integrally formed on the crankshaft stopper which is attached to the upper inner portion of the sealed casing. The resonance reducer portion of the crankshaft stopper restricts movement of motor portion and the compression device portion to increase the rigidity of the sealed casing and reduce the resonance of the sealed casing.
According to the present invention, the vibration, which is produced during the operation of the compressor and is transmitted to the sealed casing, is absorbed or damped by the resonance reducer portion of the crankshaft stopper, thereby reducing and/or preventing resonance of the sealed casing. Accordingly, transmission noise due to resonance of the sealed casing can also be reduced.
According to the preferred embodiment of the present invention, the crankshaft stopper includes a centrally formed movement restriction hole. The movement restriction hole receives the upper end of the crankshaft, the resonance reducer portion vertically bent and formed around the movement restriction hole, and at least two welding portions for connecting the crankshaft stopper.
There may be either two or four welding portions that extend vertically upward and radially outward from the movement restriction hole. Each welding portion has a plurality of embossings formed thereon.
Further, it is preferable that the crankshaft stopper with the integrally formed resonance reducer portion be attached to the upper shell of the sealed casing at an offset angle approximately of 45° from the reciprocal movement path of the piston of the compression device portion.
REFERENCES:
patent: 2907515 (1959-10-01), Davey
patent: 2929552 (1960-03-01), Mcgregor
patent: 2965289 (1960-12-01), Weibel, Jr.
patent: 3215343 (1965-11-01), Gannaway
patent: 3279683 (1966-10-01), Kleinlein
patent: 3445059 (1969-05-01), Hannibal et al.
patent: 3509907 (1970-05-01), Gannaway
patent: 3887303 (1975-06-01), Matsuzaka et al.
patent: 4406593 (1983-09-01), Kessler
The Random House College Dictionary, Random House, Inc. Ney York, N.Y. p. 426.
Freay Charles G.
Samsung Kwangju Electronics Co., Ltd.
Solak Timothy P.
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