Valve for hermetic compressor

Details Valve for hermetic compressor Valve for hermetic compressor

2002-11-19

2004-07-27

Yu, Justin R. (Department: 3746)

Pumps

Expansible chamber type

Having pumping chamber pressure responsive distributor

C417S313000, C417S566000, C417S567000, C137S512000

Reexamination Certificate

active

06767195

ABSTRACT:

BACKGROUND OF THE INVENTION
Field of the Invention
The present invention generally relates to a compressor, and more particularly to a valve for a hermetic compressor.
FIG. 1
shows a typical example of a hermetic compressor. Referring to
FIG. 1
, a reference numeral
100
denotes a casing,
200
is an electronic component unit, and
300
is a compression unit for compressing refrigerant with power supplied from the electronic component unit
200
.
As shown in
FIG. 1
, the casing
100
has upper and lower casings
110
,
120
, each of which has a substantially semicircular shape. The upper and lower casings
110
,
120
are coupled with each other, thereby defining a predetermined sealed space therewithin.
The electronic component unit
200
includes a stator
210
installed inside of the casing
100
, a rotator
220
that rotates in electromagnetic interaction with the stator
210
, and a rotary shaft
230
press-fit to the rotator
220
. The rotary shaft
230
has an eccentric portion
231
provided at its lower end.
The compression component unit
300
includes a piston
310
, a cylinder block
320
, a cylinder head
330
and a valve device
340
.
The piston
310
is linked to one end of a connecting rod
311
, which is connected at its other end to eccentric portion
231
of the rotary shaft
230
. The cylinder block
320
provides a cylinder
321
, in which the piston
310
is positioned. Accordingly, as the rotary shaft
230
is rotated, the piston
310
reciprocates within the cylinder
321
.
The cylinder head
330
is connected to the cylinder block
320
. The cylinder head
330
has a refrigerant suctioning chamber
332
and a refrigerant discharge chamber
333
, which are partitioned from each other by a partition
331
. The refrigerant suctioning chamber
332
is connected to a suction muffler
350
, while the refrigerant discharge chamber
333
is connected to a discharge muffler (not shown).
A valve
340
is disposed between the cylinder block
320
and the cylinder head
330
, and as shown in
FIG. 2
, the valve
340
includes a valve plate
341
, a suction valve
342
and a discharge valve
343
.
The valve plate
341
has a refrigerant suctioning hole
341
a
and a refrigerant discharge hole
341
b
formed therein. As shown in
FIG. 3
, the cylinder
321
of the cylinder block
320
and the refrigerant suctioning chamber
332
of the cylinder head
330
are interconnected with each other via the refrigerant suction hole
341
a
, while the cylinder
321
of the cylinder block
320
and the refrigerant discharge chamber
333
of the cylinder head
330
are interconnected with each other via the refrigerant discharge hole
341
b.
The suction valve
342
is disposed on the side of valve plate
341
closest to the cylinder block
320
, to selectively open the refrigerant suction hole
341
a
. The suction valve
342
is formed by partially cutting a suction valve sheet
342
a
disposed between the cylinder block
320
and the valve plate
341
.
The discharge valve
343
is disposed on the side of valve plate
341
closest to the cylinder head
330
to selectively open the refrigerant discharge hole
341
b
. At the rear portion of the discharge valve
343
, a stopper
344
and a keeper
345
are formed in sequential order to restrict the listing of the discharge valve
343
.
The suction valve
342
and the discharge valve
343
open or close the refrigerant suction hole
341
a
and the refrigerant discharge hole
341
b
by being moved by the pressure in the cylinder
321
, thereby causing the refrigerant of the refrigerant suctioning chamber
332
to be drawn into the cylinder
321
or causing the refrigerant of the cylinder
321
to be discharged out to the refrigerant discharge chamber
333
. Such operation of the conventional valve
340
will be described below in greater detail with reference to FIG.
3
.
During the stroke of the piston
310
moving from its upper dead end to its lower dead end, the suction valve
342
is moved by reduced pressure in the cylinder
321
to the position indicated by the one-dot line of
FIG. 3
, thereby opening the refrigerant suction hole
341
a
and letting the refrigerant of the refrigerant suction chamber
332
to be drawn into the cylinder
321
through the open refrigerant suction hole
341
a.
As the piston
310
is moved from its lower dead end to its upper dead end, the drawn refrigerant is compressed, and accordingly, the pressure in the cylinder
321
keeps increasing. At this time, the suction valve
342
is moved by the pressure in the cylinder
321
to the position indicated by the solid line of
FIG. 3
, thereby closing the refrigerant suction hole
341
a.
As the piston
310
keeps moving to its upper dead end, the pressure in the cylinder
321
also keeps increasing. Then, as the piston
310
moves very close to its upper dead end, the pressure in the cylinder
321
has increased to the maximum extent, and accordingly, the discharge valve
343
is moved by the pressure in the cylinder
321
to the position indicated by the one-dot line of
FIG. 3
, thereby opening the refrigerant discharge hole
341
b
. As a result, the compressed refrigerant in the cylinder
321
is discharged to the refrigerant discharge chamber
333
of the cylinder head
330
through the refrigerant discharge hole
341
b.
After reaching its upper dead end, the piston
310
is moved back to its lower dead end, and by the recovery force of the discharge valve
343
, the discharge valve
343
is moved to the position indicated by the solid line of
FIG. 3
, closing the discharge hole
341
b
. Accordingly, as the pressure is produced in the cylinder
321
, the refrigerant suction hole
341
a
is opened.
In the conventional valve for the hermetic compressor, when the suction valve
342
and the discharge valve
343
open and close, and especially when the discharge valve
343
closes the refrigerant discharge hole
341
b
, the discharge valve
343
strongly beats the valve plate
341
due to the recovery force of a neck
343
a
of the discharge valve
343
(see
FIG. 2
) and the recovery force of a bending portion
344
a
(see
FIG. 2
) of the stopper
344
. The striking energy generated during the beating of the valve plate
341
is converted into an instantaneous mass energy by the uniform beating of the valve plate
341
, and is then converted to vibration energy generating waves. Then, considerable noise is generated as the vibration energy is converted to negative pressure energy, generating sound waves in the air.
In the conventional valve for the hermetic compressor, additional parts like stopper
344
and the keeper
345
are employed to resiliently support the discharge valve
343
and to restrict the lifting of the discharge valve
343
. Accordingly, the number of parts increases and the structure becomes complex.
Further, since a certain space has to be ensured for the stopper
344
and the keeper
345
, the space for the cylinder head
330
and the refrigerant suction chamber
332
becomes narrower. Accordingly, the freedom in design is limited, like the design of the refrigerant suction hole
341
a
and the discharge hole
341
b.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a valve for a hermetic compressor capable of reducing a noise of the compressor by preventing the noise generating source, i.e., by reducing sound pressure energy coming from striking energy generated during the beating of a discharge valve on a valve plate, using sound transmission loss through a partition, which is obtained from a boundary interference between different mediums.
Another object is to provide a valve for a hermetic compressor contributing to a simpler construction with a smaller number of parts and the largest-possible space for a cylinder head, where the simpler construction is obtained by opening and closing a refrigerant discharge hole with the movement of a discharge valve in a certain space by the pressure of a cylinder, thereby omitting the need for parts like a stopper and keeper for supporting

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