Pumps – With muffler acting on pump fluid
Reexamination Certificate
1999-01-28
2002-06-04
Freay, Charles G. (Department: 3746)
Pumps
With muffler acting on pump fluid
C062S296000, C181S403000, C181S133000
Reexamination Certificate
active
06398520
ABSTRACT:
CLAIM OF PRIORITY
This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. §119 from my application DISCHARGE MUFFLER OF A HERMETIC ROTARY COMPRESSOR filed with the Korean Industrial Property Office on Jan. 14, 1999 and there duly assigned Serial No. 754/1999.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a hermetic rotary compressor which constitutes a refrigerating cycle of an air conditioner, a refrigerator, or the like, and more particularly to a discharge muffler for reducing noises which occur due to pulsation of refrigerant and impact to a valve when the refrigerant, which is compressed in a cylinder, is discharged.
2. Description of the Prior Art
Generally, a hermetic compressor comprises a compression unit, and a motor for driving the compression unit, which are installed within a sealed casing. Such a hermetic compressor is usually classified according to the operation type of compression unit, into a reciprocating type compressor, a scroll type compressor, and a rotary type compressor.
Among these,
FIG. 1
shows a rotary type compressor which has a relatively superb performance in comparison with its simple structure.
FIG. 1
is a vertical sectional view of a conventional hermetic rotary compressor, in which the reference numeral
10
refers to a sealed casing,
20
refers to a motor, and
30
refers to a compression unit.
As shown in
FIG. 1
, the compression unit
30
comprises a pair of flanges
32
and
34
for supporting an eccentric shaft
22
of the motor, a cylinder
36
which is disposed between the flanges
32
and
34
, and a roller
38
which surrounds the eccentric shaft
22
.
The refrigerant which is sucked into an inner space defined by the cylinder
36
through a suction port
52
, is compressed by the rotational movement of the roller
38
. The compressed
25
refrigerant is discharged into an inner space of the sealed casing
10
through a discharge port
33
which is formed on the upper flange
32
.
The reference numeral
40
in
FIG. 1
refers to a discharge muffler. The discharge muffler
40
functions to reduce the noise which occurs due to the pulsation of the refrigerant and the noise which occurs due to the impact to a valve
39
when the refrigerant is discharged through the discharge port
33
. Such the discharge muffler
40
is in such a shape that is shown in
FIGS. 2 and 3
, and is disposed above the upper flange
32
to define a noise reducing space with the upper flange
32
, so that the noise reducing space is defined between the discharge muffler
40
and the upper flange
32
. Accordingly, the refrigerant is discharged through the discharge port
33
to the noise reducing space, and then discharged into the inner space of the sealed casing
10
through a pair of discharge openings
42
which are formed on the discharge muffler
40
. In such a situation, the noise, which is produced while the refrigerant is discharged, is reduced while the refrigerant is expanded in the discharge muffler
40
. As described, the purpose of employing the discharge muffler
40
is to reduce the noise. In
FIG. 1
, the reference numeral
60
refers to an accumulator.
In the conventional discharge muffler, however, since the refrigerant, which is discharged into the noise reducing space, is directly discharged through the discharge openings, the noise from the pulsation of refrigerant and the impact to the valve are not reduced, satisfactorily.
Further, in the conventional hermetic rotary compressor, since the oil for lubricating the eccentric shaft
22
is discharged together with the refrigerant when the refrigerant is discharged through the discharge port
33
, and since there is no separate device for suppressing the amount of discharged oil, the amount of discharged oil increases while the amount of discharged refrigerant decreases. Accordingly, the efficiency of the compressor is deteriorated.
A Japanese Patent Laid-Open No. 2-61375 discloses a noise reducing device of a hermetic compressor, which overcomes the above-described problems of the prior art, and is shown in
FIGS. 4 and 5
.
As shown in
FIGS. 4 and 5
, the noise reducing device of the hermetic compressor has a connecting pipe
44
′ which is disposed at a lower side of the discharge opening
42
′ of the discharge muffler
40
′. The connecting pipe
44
′ serves as a resonance device to reduce the noise. The hermetic compressor, however, has a disadvantage in that the structure and manufacturing process thereof are complex.
SUMMARY OF THE INVENTION
The present invention has been developed to overcome the above-mentioned problem of the prior art, and accordingly, it is an object of the present invention to provide a discharge muffler of a hermetic rotary compressor which has a simple structure and reduces the noises which occur due to the pulsation of the refrigerant and the impact to the valve when the refrigerant is discharged.
The above object will be accomplished by the discharge muffler according to the present invention which comprises a muffler body, and a phase varying means. The muffler body is disposed above an upper flange having a refrigerant discharge port to define a noise reducing space with the upper flange. The muffler body has a pair of discharge openings. The phase varying means blocks the noises which occur due to the pulsation of the refrigerant and the impact to a valve when the refrigerant is discharged. Here, the valve is disposed at a discharge port. The phase varying means prevent the noises which occurs due to the pulsation of the refrigerant and the impact to the valve, from being discharged together with the refrigerant. The phase varying means also counterbalances the noises by varying the phases of the noises.
The phase varying means comprises a pair of covers which extend from the muffler body toward the center of the discharge opening. The covers cover approximately half portion of the discharge opening from above and from below, respectively, in an alternating pattern.
Here, the phase varying means is formed at a pair of discharge openings, respectively, and has such an arrangement that permits the refrigerant to be discharged in the circumferential direction of the muffler body.
Further, a pair of covers can be designed either in a hemispheric shape, or in a semi-oval shape, or in any shape only if it is of spheric shape.
Accordingly, the noise which is produced while the refrigerant is discharged, is blocked by the phase varying means, and simultaneously, the phases of the noises are varied so that the noises are counterbalanced. As a result, the great noise reduction effect is guaranteed with a simple structure.
REFERENCES:
patent: 1691305 (1928-11-01), Replogle
patent: 1918149 (1933-07-01), Sullivan
patent: 2557687 (1951-06-01), Rainville
patent: 3107484 (1963-10-01), Touhey
patent: 4557349 (1985-12-01), Crump
patent: 4601644 (1986-07-01), Gannaway
patent: 48-108026 (1972-03-01), None
patent: 57-068113 (1980-10-01), None
patent: 60-180708 (1985-11-01), None
Bushnell , Esq. Robert E.
Rodriguez William
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