Reciprocating compressor

Details Reciprocating compressor Reciprocating compressor

2003-02-18

2004-12-28

Freay, Charles G. (Department: 3746)

Pumps

With muffler acting on pump fluid

C417S540000

Reexamination Certificate

active

06835050

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a reciprocating compressor, and more particularly, to a reciprocating compressor having a discharge pulsation reducing structure for reducing noise made during the discharge of refrigerant step.
2. Description of the Related Art
A general reciprocating compressor is used in refrigerating machines, such as refrigerators and water cooling machines, for compressing low pressure gas refrigerant into high pressure refrigerant.
As shown in
FIG. 1
, a conventional reciprocating compressor comprises a case
10
comprised of an upper shell
11
and a lower shell
12
, a compression unit
30
disposed inside the lower part of the compressor and comprised of apparatuses for compressing refrigerant, and an electrically-driven unit
20
for driving the compression unit
30
.
The compression unit
30
comprises a cylinder head
60
having a refrigerant suction chamber
61
and a refrigerant discharge chamber
62
, a cylinder block
70
having a compression chamber
71
in which refrigerant is compressed, a valve assembly
80
controlling the flow of refrigerant between the cylinder head
60
and the cylinder block
70
, a piston
50
disposed inside the compression chamber
71
, and a connecting rod
40
moving the piston
50
to reciprocate linearly.
The electrically-driven unit
20
for driving the compression unit
30
comprises a stator
21
fixed to the case
10
, a rotor
22
rotating by means of electromagnetic reciprocating operation relative to the stator
21
, and a crank shaft
23
press-fit in the rotor
22
and having an eccentric portion
23
a
. The eccentric portion
23
a
is connected to the connecting rod
40
.
As shown in
FIG. 2
, a protruding discharge muffler
72
is provided at the bottom of the cylinder block
70
. The discharge muffler
72
is connected with a refrigerant discharge pipe
74
, which is connected to a condenser (not shown) and the discharge muffler
72
is sealed by a muffler cover
73
. In addition, the discharge muffler
72
is connected to a refrigerant path
75
formed through the cylinder block
70
. The refrigerant in the refrigerant discharge chamber
62
flows into the discharge muffler
72
through the refrigerant path
75
.
In the above-described conventional compressor, as shown in
FIGS. 1 and 2
, the refrigerant flows into the compression chamber
71
sequentially through a refrigerant suction pipe
91
, a muffler
90
, and into the refrigerant suction chamber
61
, and is discharged into the refrigerant discharge chamber
62
after being compressed by linear reciprocation of the piston
50
. The refrigerant discharged into the refrigerant discharge chamber
62
flows into the discharge muffler
72
through the refrigerant path
75
and then into the condenser through the refrigerant discharge pipe
74
.
However, in such a conventional reciprocating compressor, discharge pulsation occurs because the piston
50
in the compression chamber
71
sucks in, compresses, and discharges the refrigerant while linearly reciprocating. Such discharge pulsation of the refrigerant causes noise and vibration in the compressor. Particularly, since the vibration of the compressor occurs at the acoustic low frequency band corresponding to the natural or resonant frequency of other parts of the refrigerator, this creates resonance with other parts of the refrigerator. This resonance causes noise and vibration to increase in the overall refrigerator during operation.
The discharge pulsation of the refrigerant may be reduced by increasing the flow resistance of the discharge refrigerant. That is, the discharge pulsation of the refrigerant may be reduced by reducing the sectional area of the refrigerant path
75
between the refrigerant discharge chamber
62
and the discharge muffler
72
, or lengthening the refrigerant path
75
, either of which causes an increase in flow resistance. However, when the sectional area of the refrigerant path
75
is too small, the refrigerant cannot flow smoothly between the refrigerant discharge chamber
62
and the discharge muffler
72
, and therefore the compression efficiency of the compressor drops. In addition, the refrigerant cannot be sufficiently lengthened as it is formed through the cylinder block
70
.
SUMMARY OF THE INVENTION
In order to solve the above-mentioned problem, the present invention has been developed to provide a reciprocating compressor capable of efficiently reducing the discharge pulsation by improving the refrigerant discharge structure.
In order to achieve the object of the present invention, the reciprocating compressor comprises a main frame disposed inside a case to support an electrically-driven unit, a cylinder block connected with the main frame and having a compression chamber, a cylinder head having a refrigerant discharge chamber and connected with the cylinder block to seal the compression chamber, a first chamber formed at one side of the cylinder block to be connected with the refrigerant discharge chamber, a second chamber connected with a refrigerant discharge pipe and formed at another side of the cylinder block, and a gasket disposed between the main frame and the cylinder block, the gasket having a groove for providing a connecting path connecting the first chamber and the second chamber and thus fluid communication between the chambers.
Accordingly, discharge pulsation is reduced as the compressed refrigerant flows through the first chamber, the connecting path, and the second chamber before being discharged through the refrigerant discharge pipe.
In the above-described structure, it is preferable that a first oil chamber corresponding to the first chamber is disposed at one side of the main frame adjacent the first chamber, and a second oil chamber corresponding to the second chamber is disposed at another side of the main frame.
In addition, it is preferable that the first and the second chambers have a height of between about 14 mm and 30 mm and a volume of between about 15 and 25 cc.
The connecting path has a cross sectional area of between about 2.5 and 10 mm
2
.
It is preferable that the first and second oil chambers have a volume of between about 8 and 10 cc.
It is preferable that an insertion hole is formed at one side of the second chamber, and the refrigerant discharge pipe is connected with the refrigerant discharge tube inserted in the insertion hole.


REFERENCES:
patent: 2236112 (1941-03-01), Philipp
patent: 5173034 (1992-12-01), Riffe
patent: 5577901 (1996-11-01), Yoon
patent: 5749714 (1998-05-01), Lee
patent: 6533064 (2003-03-01), Kim et al.

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