Pumps – Expansible chamber type – Valved piston
Reexamination Certificate
2002-10-10
2004-10-12
Yu, Justine R. (Department: 3746)
Pumps
Expansible chamber type
Valved piston
C417S547000, C417S555100, C092S18100P, C092S18100P, C137S315330, C137S533270
Reexamination Certificate
active
06802701
ABSTRACT:
This nonprovisional application claims priority under 35 U.S.C. §119(a) on Patent Application No. 2001-0067223 filed in KOREA on Oct. 30, 2001, which is herein incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a suction valve assembly opened and closed by a fluid pressure, and more particularly, to a suction valve assembly of a compressor that is capable of preventing generation of a dead volume inside a compressor.
2. Description of the Background Art
In general, a suction valve assembly is installed between a compression chamber in which a fluid is compressed in a compressor or the like and a suction passage which sucks the fluid, so that, when the fluid is sucked, the suction valve assembly is opened by an inertia and supplies the fluid introduced through the suction passage to the compression chamber, and when the fluid is compressed, the suction valve assembly prevents the fluid being compressed in the compression chamber from flowing backward to the suction passage.
FIG. 1
is a partial sectional view of a compressor employing the suction valve assembly in accordance with a conventional art, and
FIG. 2
is a view showing an operational state of the compressor employing the suction valve assembly in accordance with the conventional art.
The conventional compressor includes a cylinder fixedly disposed at a case (not shown) and forming a compression chamber
102
, a piston
106
inserted into the cylinder
104
to be linearly and reciprocally movable to compress a fluid, and a suction valve assembly disposed at a front side of the piston
106
and opening and closing the fluid being sucked.
The piston
106
includes a suction passage
108
formed at the center thereof in a longitudinal direction to suck a fluid. A support portion
112
is formed at a front side of the piston
106
, having a suction hole
110
to supply the fluid introduced into the suction passage
108
to the compression chamber
102
. A valve seat
114
is formed at a front side of the support portion
112
.
The suction valve assembly consists of a valve body
116
tightly adhered to the valve seat
114
and opened and closed, and a connection bolt
118
connected between the valve body
116
and the support portion
112
in order to prevent the valve body from releasing from the valve seat
114
.
The valve body
116
is formed tapered with a certain angle at its outer circumferential surface and contacted to the valve seat
114
, a through hole
120
is formed at the center thereof that the connection bolt
118
penetrates, and a guide groove
124
is formed with a diameter extended from the through hole
120
so that a bolt head
126
of the connection bolt
118
can be inserted to be linearly movable.
The connection bolt
118
passes the through hole
120
and bolt-engaged with the support portion
112
, and the bolt head
126
of the connection bolt
118
is inserted into and linearly movable in the guide groove
124
.
That is, when the valve body
116
is linearly moved and released from the valve seat
114
, the bolt head of the connection bolt
118
is hooked at the inner side of the guide groove
124
, so as to prevent the valve body
116
from releasing outwardly from the piston
106
.
In the conventional suction valve assembly of a compressor constructed as described above, when the piston
106
is retreated by the operation of the driving unit (not shown) of the compressor to supply a fluid into the compression chamber
102
, the valve body
116
is released from the valve seat
114
owing to the pressure of the fluid, so that the fluid introduced into the suction hole
110
of the piston is supplied to the compression chamber
102
.
In this state, when the piston
106
is advanced for a compression operation of the fluid, the valve body
116
is tightly contacted to the valve seat
114
owing to the pressure of the fluid, whereby the fluid of the compression chamber
102
is prevented from flowing backward to the suction side.
However, the conventional suction valve assembly of a compressor has the following problems. That is, as described above, the guide groove with a certain volume is formed in the valve body so that the bolt head supporting the linear movement of the valve body can be linearly moved. In this respect, since the guide groove forms a portion of the compression chamber, the fluid of the compression chamber is introduced into the guide groove, when the fluid is compressed, to create a dead volume, which results in degradation of a compression efficiency.
In addition, when the fluid is compressed, in order to prevent the fluid from leaking into a gap between the through hole formed at the valve body and the connection bolt, a precision processing is required for sealing the parts. This causes a problem of increase in a fabrication cost.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a suction valve assembly of a compressor in which a guide groove inside a compression chamber is removed to prevent generation of a dead volume, thereby improving an efficiency of a compressor.
Another object of the present invention is to provide a suction valve assembly of a compressor in which a portion of a valve from which a fluid is leaked is removed to thereby reduce a fabrication cost and prevent degradation of a compression efficiency due to fluid leakage as a precision processing of a part for preventing the fluid leakage is not necessary.
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 compressor including: a piston disposed movable in a cylinder forming a compression chamber, having a suction passage for sucking a fluid and a valve seat formed at a front side thereof; a valve body contacted to the valve seat to open and close the fluid, of which a front side making a portion of the compression chamber is formed hermetical; a support rod inserted into a rear portion of the valve body and fixed at one side of the piston and supporting the valve body to be moved in a certain range; and a release preventing unit formed between the valve body and the support rod to prevent the valve body from releasing from the support rod.
In the suction valve assembly of a compressor of the present invention, the valve body of the suction valve assembly is formed tapered at its outer circumferential surface with a certain angle so as to be tightly adhered to the valve seat, and has a through hole formed at a rear side, into which the support rod is inserted, and a space part extended from the through hole and having a diameter larger than that of the through hole.
In the suction valve assembly of a compressor of the present invention, the support rod is formed integrally with the support portion formed at a front side of the piston.
In the suction valve assembly of a compressor of the present invention, the release preventing unit of the suction valve assembly includes a female screw formed at an inner circumferential face of an insertion groove of a valve body and a male screw formed at an end portion of the support rod and engaged with the female screw.
In the suction valve assembly of a compressor of the present invention, the space part of the valve body is formed with a certain gap so that an inner side of the space part and an upper face of the male screw of the support rod are not in contact with each other when the valve body is tightly adhered to the valve seat.
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 307862 (1884-11-01), Loth
patent: 946684 (1910-01-01), Neighbors
patent: 1293936 (1919-02-01), Rose
patent: 1294014 (1919-02-01), Worster
patent: 1808745 (1931-06-01), Bledsoe et al.
patent: 2044594 (1936-06-01), Scholfield
patent: 2701581 (195
Jung Choong-Min
Noh Ki-Won
LG Electronics Inc.
Sayoc Emmanuel
Yu Justine R.
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