Cylinder assembly and hermetic compressor having the same

Details Cylinder assembly and hermetic compressor having the same Cylinder assembly and hermetic compressor having the same

2003-02-19

2004-12-07

Freay, Charles G. (Department: 3746)

Pumps

Expansible chamber type

Having pumping chamber pressure responsive distributor

C417S569000

Reexamination Certificate

active

06827561

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a hermetic compressor, and more particularly, to a cylinder assembly having the structure improved for easy suction of refrigerant into a cylinder, and a hermetic compressor having the cylinder assembly.
2. Background of the Related Art
As is known to those skilled in the art, a conventional hermetic compressor comprises a casing
100
, a drive unit
200
disposed inside the casing
100
, a compression unit
300
, and a cylinder assembly
400
, as shown in FIG.
1
.
The casing
100
is comprised of an upper casing
110
and a lower casing
120
attached to each other, as shown, and has an inlet tube
130
and a discharge tube
140
. Lubricant is stored at the bottom of the lower casing
120
and refrigerant flows in through the inlet tube
130
to be charged inside the casing
100
.
The drive unit
200
comprises a stator
210
fixed in the casing
100
, a rotor
220
disposed inside the stator to rotate relative thereto, and a crank shaft
230
disposed to rotate together with the rotor
220
.
The compression unit
300
comprises a connecting rod
310
connected with an eccentric portion
240
of the crank shaft
230
being capable of converting the rotary movement of the rotor
220
into linear reciprocation, and a piston
320
connected with one end of the connecting rod
310
.
The cylinder assembly
400
shown in exploded detail in
FIG. 2
comprises a cylinder block
420
defining a cylindrical volume or cylinder
410
in which the piston is inserted, a cylinder head
430
connected with the cylinder block
420
by bolts A for sealing the cylinder
410
, and a valve plate
440
interposed between the cylinder block
420
and the cylinder head
430
.
Referring now to both
FIGS. 1 and 2
, the cylinder head
430
has a wall
431
formed at an inner side. The wall
431
divides the inside of the cylinder head
430
into a suction chamber
432
and a discharge chamber
433
. The cylinder head
430
has a refrigerant path
434
and refrigerant from a suction muffler
500
flows into the suction chamber
432
through the refrigerant path
434
.
A gasket
450
is interposed between the cylinder head
430
and the valve plate
440
for sealing therebetween.
The valve plate
440
comprises a suction port
441
and a discharge port
442
. The suction port
441
connects the suction chamber
432
and the cylinder
410
, and the discharge port
442
connects the discharge chamber
433
and the cylinder
410
.
The suction port
441
is opened and closed by a suction valve
471
. The suction valve
471
is integrally formed with a suction valve sheet
470
interposed between the cylinder block
420
and the valve plate
440
. A gasket
460
is interposed between the suction valve sheet
470
and the cylinder block
420
for sealing therebetween.
The discharge port
442
is opened or closed by the movement of a discharge valve
481
. The discharge valve
481
together with a stopper
482
and a keeper
483
are disposed in a recess
480
, which is formed in the valve plate
440
.
As shown in
FIG. 3
, in the conventional cylinder assembly
400
structured as described above, the pressure of the cylinder
410
is lower than that of the suction chamber
432
when the piston
320
moves from the top dead end to the bottom dead end, and the suction valve
471
moves in accordance with the pressure difference and thereby opens the suction port
441
. Then, the refrigerant in the casing
100
flows into a suction muffler
500
(FIG.
1
), and the refrigerant of the suction muffler
500
is sucked inside the cylinder
410
through the suction port
441
after passing the suction chamber
432
.
However, in the case of a conventional cylinder assembly as described above, refrigerant is not easily sucked into the cylinder
410
because only the refrigerant inside the suction muffler
500
is sucked through the refrigerant path
434
at the time of the suction stroke of the piston
320
.
In addition, since there is a large gap in pressure between the cylinder
410
and the suction chamber
432
, the parts comprising the compressor are likely to undergo stress and the strength and starting efficiency of the compressor decrease.
SUMMARY OF THE INVENTION
An object of the invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
Accordingly, one object of the present invention is to solve the foregoing problems by providing a cylinder assembly having improved strength and starting efficiency and a hermetic compressor employing the same by permitting the refrigerant to be more easily sucked into the cylinder.
In order to achieve the above object of the present invention, the cylinder assembly comprises a cylinder block having a cylinder for compressing refrigerant, a valve plate contacted to one side of the cylinder block and having a suction port for sucking refrigerant into the cylinder, a suction valve for opening and closing the suction port, a cylinder head connected with the valve plate and having a suction chamber, a refrigerant path formed at one side of the cylinder head for letting refrigerant flow into the suction chamber, and a groove formed on the valve plate removed from the refrigerant path for guiding refrigerant into the suction chamber.
It is preferable that the groove extended from one edge of the valve plate to the suction chamber.
In addition, the hermetic compressor according to the present invention comprises a casing into which refrigerant can flow, a rotor rotatably inserted in a stator disposed inside the casing, a crank shaft rotated by the rotor, a connecting rod having one end connected with the crank shaft, a piston connected with another end of the connecting rod, and a cylinder assembly in which refrigerant is compressed by operation of the piston, and the cylinder assembly comprises a cylinder block having a cylinder for compressing refrigerant, a valve plate contacted to one side of the cylinder block and having a suction port for sucking refrigerant into the cylinder and a discharge port for discharging the compressed refrigerant from the cylinder, a suction valve for opening and closing the suction port, a discharge valve for opening and closing the discharge port, a cylinder head disposed at one side of the valve plate and having a suction chamber and a discharge chamber, a refrigerant path formed at one side of the cylinder head for letting refrigerant flow into the suction chamber, and a groove formed on the valve plate removed from the refrigerant path for guiding refrigerant inside the casing into the suction chamber.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the specification and drawings or may be learned from practice of the invention. The objects and advantages of the invention may be realized and attained as particularly pointed out in the appended claims.


REFERENCES:
patent: 4854839 (1989-08-01), DiFlora
patent: 5542824 (1996-08-01), Lee
patent: 5577901 (1996-11-01), Yoon
patent: 10196536 (1998-07-01), None

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