Fluid handling – Line condition change responsive valves – Direct response valves
Reexamination Certificate
2002-09-13
2004-07-27
Rivell, John (Department: 3753)
Fluid handling
Line condition change responsive valves
Direct response valves
C137S856000, C251S064000
Reexamination Certificate
active
06766823
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a valve apparatus for a hermetic compressor, and more particularly, to a valve apparatus for a hermetic compressor capable of improving the discharging efficiency of a refrigerant, and reducing abrasion and noise generated by the valve apparatus.
BACKGROUND OF THE INVENTION
Generally, a hermetic compressor includes a reciprocal compressor, a linear compressor, and a rotary compressor. Most of the compressors have a valve apparatus for preventing a refrigerant from being drawn into a compressing chamber.
The valve apparatus of a conventional reciprocal compressor associated with hermetic compressors is shown in FIG.
1
. As shown in
FIG. 1
, the valve apparatus comprises a valve plate
10
having a refrigerant discharging hole
10
a
being disposed between a cylinder block (not shown) and a cylinder head (not shown), a discharging valve
11
disposed at the valve plate
10
, a stopper
13
, and a keeper
15
.
One end of the discharging valve
11
and the stopper
13
are connected to an outer surface of the valve plate
10
. The stopper
13
has a longer length than that of the discharging valve
11
. The keeper
15
is placed above the stopper
13
and is protuberant upwardly. A free end of the stopper
13
contacts a bend portion of the keeper
15
, particularly when the compressor is operating.
In the above construction, a refrigerant is compressed by a piston (not shown) and discharged through the discharging hole
10
a
. At this time, the discharging valve
11
is pressed against the stopper
13
as the discharging valve
11
is opened by the pressure of the discharging refrigerant. The stopper
13
is repeatedly pressed against the keeper
15
as the center of the stopper
13
is bent by the discharging pressure.
Additionally, the discharging force and noise can be reduced by reducing the movement of the discharging valve
11
, as the free end of the stopper
13
is stopped by the bent portion of the keeper
15
. In other words, when the compressor operates, the level of the discharging force and the noise of the valve apparatus can be controlled by adjusting the height of the keeper
15
and the size of the refrigerant discharging hole
10
a.
However, the keeper
15
and the discharging valve
11
are fixed in the above valve apparatus, and the height of the keeper
15
and the size of the discharging valve
11
cannot be adjusted. This makes it difficult to find an appropriate point to allow the discharging valve
11
to be opened in accordance with the discharging pressure of the refrigerant.
Moreover, as the size of the refrigerant discharging hole
10
a
formed at the valve plate
10
is varied in accordance with the amount of the refrigerant, a valve plate
10
having a standardized refrigerant discharging hole
10
a
size cannot be manufactured. Accordingly, valve plates
10
having various dimension and specifications must be manufactured to meet each particular situation.
SUMMARY OF THE INVENTION
The present invention has been made to overcome the above-mentioned problems of the related art. Accordingly, it is an object of the present invention to provide a valve apparatus of a hermetic compressor having an improved structure for freely adjusting a height of the valve in accordance with a discharging pressure and discharging amount of refrigerant.
The valve apparatus of the hermetic compressor according to the present invention comprises a valve plate having a refrigerant discharging hole for discharging a refrigerant, a discharging valve having one end fixed at the valve plate and another end for opening and closing the refrigerant discharging hole, a stopper having one end fixed at the valve plate in order to support the discharging valve, a keeper fixed at the valve plate and disposed at an upper part of the stopper at a predetermined distance, a first shock absorbing means disposed at the keeper for buffering the opening and closing of the stopper, and a second shock absorbing means disposed at the keeper in order to move up and down. The second shock absorbing means is for buffering the opening and closing of the stopper together with the first shock absorbing means.
In the preferred embodiment, the first shock absorbing means includes a spring disposed at a lower part of the keeper and a shock absorbing plate supported at the spring and connected with the stopper in order to buffer the stopper. The second shock absorbing means includes a cylinder disposed at the keeper and a piston having one end connected with the first shock absorbing means and another end that reciprocates in the cylinder. Additionally, in the preferred embodiment the cylinder is an air cylinder.
REFERENCES:
patent: 1768638 (1930-07-01), Sheats
patent: 2302447 (1942-11-01), King et al.
patent: 3939867 (1976-02-01), Lundvik et al.
patent: 4749340 (1988-06-01), Ikeda et al.
patent: 5228468 (1993-07-01), Kapadia
patent: 5647395 (1997-07-01), Hashimoto et al.
patent: 6314990 (2001-11-01), Brabek et al.
patent: 6701961 (2004-03-01), Okuyama et al.
Blank Rome LLP
Rivell John
Samsung Gwangju Electronics Co. Ltd.
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