Pumps – Expansible chamber type – Valved piston
Reexamination Certificate
2002-12-18
2004-12-28
Koczo, Michael (Department: 3746)
Pumps
Expansible chamber type
Valved piston
Reexamination Certificate
active
06835052
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a suction valve assembly of a reciprocating compressor, and more particularly, to a suction valve assembly of a reciprocating compressor that is capable of preventing occurrence of dead volume inside a compression chamber and capable of improving an operation reliability of the reciprocating compressor.
2. Description of the Background Art
In general, a suction valve assembly is installed between a compression chamber for compressing a fluid and a suction passage for sucking the fluid in a reciprocating compressor, so as to be opened owing to an inertia when the fluid is sucked to supply the fluid introduced through the suction passage to the compression chamber and prevent the fluid compressed in the compression chamber from flowing backward.
FIG. 1
is a partial sectional view of a compressor having a suction valve assembly in accordance with a conventional art,
FIG. 2
is an exploded perspective view of the suction valve in accordance with the conventional art, and
FIG. 3
is a front view of the suction valve in accordance with the conventional art.
The conventional compressor includes a cylinder
104
fixedly disposed at a case (not shown) and forming a compression chamber
102
; a piston
106
for being linearly, reciprocally and movably inserted in the cylinder
104
and compressing a fluid; a suction valve
110
mounted at a front side of the piston
106
and opening and shutting the fluid being sucked; and a discharge valve assembly
108
for discharging the fluid from the compression chamber
102
when the fluid is compressed by higher than a certain level in the compression chamber
102
.
The piston
106
includes a suction passage
112
for sucking the fluid in a longitudinal direction at the central portion thereof, a suction hole
114
formed at the front side of the piston
106
for supplying the fluid introduced into the suction passage
112
into the compression chamber
102
, and a suction valve
110
mounted at the front side of the suction hole
114
for opening and shutting the suction hole
114
.
One side of the suction valve
110
is fixed by a bolt or welded at the front side of the piston
106
and formed as a disk type having a certain elastic force.
The suction valve
110
includes a fixing portion
120
of which the center is fixed by a bolt or welded at the center of the front side of the piston
106
, a slit
122
cut in a curved line with a certain width, and an open and shut portion
126
formed at one side of the suction valve
110
divided by the slit
122
and cantacted to the suction hole
112
.
The open and shut portion
126
has a certain elastic force when it becomes open from a neck portion
124
of the slit
122
.
The discharge valve assembly
108
includes a valve cover
132
mounted at a front side of the cylinder
104
and having a discharge hole
130
for discharging a fluid, a discharge valve
134
contacted at the front side of the cylinder
104
and making an opening and shutting operation of fluid, and a spring
136
arranged between the discharge valve
134
and an inner wall of the valve cover
132
and giving a certain elastic force to the discharge valve
134
.
In the suction valve of the reciprocating compressor in accordance with the conventional art, when the piston
106
is retreated by an operation of a driving device (not shown) of the compressor so as to supply a fluid to the compression chamber
102
, the open and shut portion
126
of the suction valve
110
is separated down from the front side of the piston
106
owing to the pressure of the fluid to open the suction hole
114
, so that the fluid introduced into the suction passage
112
is supplied to the compression chamber
102
.
In this state, when the piston
106
is advanced to compress the fluid, the suction valve
126
is contacted at the front side of the piston
106
owing to the elastic force by itself to shut the suction hole
114
, and when the piston
106
is more advanced therefrom, the elastic force of the spring
136
is overcome, thereby the discharge valve
136
is separated from the front side of the cylinder
104
, and the fluid compressed in the compression chamber
102
is discharged outwardly through the discharge hole
130
.
However, the suction valve of the reciprocating compressor in accordance with the conventional art has the thin flat disk type and one side thereof is cut and bent centering around the neck portion, whereby the open and shut portion is bent to open and shut the suction hole. Thus, when the open and shut portion is separated from the front side of the piston, a stress works concentratively on the neck portion. Therefore, if the open and shut portion is continuously opened and shut or excessively opened, the neck portion can be damaged.
In addition, with these problems, if the compressor has a large capacity, when a fluid compression volume is designed large, the area in which the open and shut portion is opened is limited, degrading an efficiency of the compressor.
Moreover, as described above, the suction valve is coupled to the front side of the piston by welding or by bolt. Thus, in case of fixing with the bolt, a dead volume occurs inside the compression chamber. Meanwhile, in case of welding, a high pressure is generated so that the fixing portion of the suction valve is separated from the front side of the piston.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a suction valve assembly of a reciprocating compressor that is capable of minimizing a dead volume inside a compression chamber by making a valve side forming the compression chamber to be plane.
Another object of the present invention is to provide a suction valve assembly of a reciprocating compressor that is capable of strengthening a structural coupling strength of a valve and capable of improving an operation reliability.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a suction valve assembly of a reciprocating compressor including: a piston
6
disposed to be linearly movable at a cylinder
4
forming a compression chamber
2
and having a suction passage
8
for sucking a fluid and a valve
14
formed at a front side thereof; a valve plate
20
detachably attached at the valve seat
14
of the piston
6
, and opening and shutting the suction passage
8
; an inertial valve
16
extended from a rear side of the valve plate
20
and inserted into the suction passage
8
and having a support bar
22
with a plurality of guide grooves
24
at regular intervals in a circumferential direction; and a guide pin
18
slidably inserted into the guide groove
24
of the inertial valve and fixed at the piston
6
to limit an opening rate of the valve plate
20
.
In the suction valve assembly of a reciprocating compressor of the present invention, the inertial valve
16
includes a plurality of valve guides
26
being radially extended from an outer circumferential face of the support bar
22
so as to be in contact with an inner wall of the piston
6
to support movement of the inertial valve, one side thereof being attached to a rear side of the valve plate
20
so as to reinforce the valve plate.
In the suction valve assembly of a reciprocating compressor of the present invention, the valve guide
26
is extended at the interval of
1200
from the outer circumferential surface of the support bar
22
.
In the suction valve assembly of a reciprocating compressor of the present invention, the valve plate
20
is formed as a disk type, having a diameter larger than an inner diameter of the piston
6
and smaller than an inner diameter of the cylinder
4
.
In the suction valve assembly of a reciprocating compressor of the present invention, the valve seat
14
is formed flat and the valve plate
20
is also formed flat, so that both even surfaces are in contact with each other.
In the suction valve assembly of a reciprocating compre
Greenblum & Bernstein P.L.C.
Koczo Michael
LG Electronics Inc.
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