Pumps – Expansible chamber type – Valved piston
Reexamination Certificate
2001-10-16
2004-02-24
Walton, George L. (Department: 3754)
Pumps
Expansible chamber type
Valved piston
C417S549000, C417S552000
Reexamination Certificate
active
06695596
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a suction gas valve apparatus of a reciprocating compressor, and in particular to a suction gas valve apparatus of a reciprocating compressor which is capable of promoting an efficiency of a refrigerant by minimizing a heat transmission between a suction gas valve apparatus and the refrigerant by improving respondency of a suction gas valve and simplifying its structure.
BACKGROUND ART
In general, a compressor compresses a fluid such as refrigerant gas, etc. A compressor is constructed with a motor part generating a driving force and a compression part compressing a fluid by being transmitted the driving force. A shape of the compression part is various, but in general a piston inserted into a cylinder is transmitted the driving force from the motor part, sucks a fluid, compresses the fluid and discharges it while performing a linear reciprocating motion inside the cylinder.
FIG. 1
is a sectional view illustrating a piston and a suction gas valve apparatus of a compressor installed to the piston in accordance with the prior art. As depicted in
FIG. 1
, in a suction gas valve apparatus of a compressor in accordance with the prior art, a piston
10
is inserted into a cylinder
1
. Herein, the piston
10
inserted into the cylinder
1
is constructed with a cylindrical body unit
11
having a certain diameter and a certain length, a valve mounting portion K formed at a certain end of the cylindrical body unit
11
in order to be mounted with a suction valve body
20
and a hole H having a certain diameter and a certain length and formed at the other end of the cylindrical body unit
11
.
In the cylindrical body unit
11
, a mounting groove
12
having a certain diameter and a length is formed at an end of the cylindrical body unit
11
, and a multistage mounting protrusion portion N is protrusively formed from a bottom surface of the mounting groove
12
in a upward direction. By the mounting groove
12
formed at the end of the cylindrical body unit
11
, a ring-shaped rim portion
13
having a certain length and a width in a circumference direction of the piston
10
is formed, and the inner end of the rim portion
13
forms a first valve seat
14
declined to a center of the piston
10
. A plurality of suction holes
15
connected to the mounting groove
12
are formed at the rim portion
13
.
And, the mounting protrusion portion N includes a fist circular protrusion
16
upwardly extended-formed from the bottom surface of the mounting groove
12
so as to be smaller than an outer diameter of the mounting groove
12
and have an outer diameter same as an inner diameter of the mounting groove
12
, and a second circular protrusion
17
formed at the upper surface of the first circular protrusion
16
so as to have a smaller diameter than the outer diameter of the first circular protrusion
16
and have a certain height.
And, a through hole
18
is formed at the center portion of the first and the second circular protrusions
16
,
17
so as to connect to the hole H formed at the opposite side of the mounting protrusion portion N. Herein, the height of the first and the second circular protrusions
16
,
17
is lower than the height of the rim portion
13
. And, the rim portion
13
of the first circular protrusion
16
is projected so as to have a sloping side declined to the center of the piston
10
and forms a second valve seat
19
with the upper surface of the first circular protrusion
16
.
And, a suction valve body
20
installed inside the valve mounting portion K of the piston
10
has a certain height and a conic shape with a plane upper surface. The outer circumference of the suction valve body
20
is formed so as to be stepped, the upper outer circumference having a bigger outer diameter consists a first contact surface
21
, the lower outer circumference having a smaller outer diameter consists a second contact surface
22
. A plane bottom surface having a small area consists a third contact surface
23
.
And, a through hole
24
is formed at the center portion of the suction valve body
20
, a first insertion groove
25
is formed at the center portion of the third contact surface
23
so as to have an inner diameter and a height corresponded to the outer diameter and the height of the second circular protrusion
17
of the valve mounting portion K of the piston
10
, and a second insertion groove
26
is formed at the center portion of the bottom surface of the suction valve body
20
so as to have a certain inner diameter and a depth. The inner diameter of the first insertion groove
25
is larger than the inner diameter of the second insertion groove
26
, the center lines of the first and the second insertion grooves
25
,
26
are placed at the line same as the center line of the through hole
24
.
Hereinafter, installing the suction valve body
20
to the piston
10
will now be described in detail.
First, a first insertion groove
25
of the suction valve body
20
is inserted into the second circular protrusion
17
of the valve mounting portion K. Herein, the part of the third contact surface
23
and the second contact surface
22
of the suction valve body
20
is contacted to the second valve seat
19
, and the first contact surface
21
is contacted to the first valve seat
14
. In addition, the through hole
24
of the suction valve body
20
is combined to the through hole
18
of the piston
10
by corresponding their center lines.
And, a combining guide rod
30
having a certain length and head units
31
,
31
′ at both ends is combined inside the through hole
18
of the suction valve body
20
and the through hole
18
of the piston
10
. The head unit
31
combined to the end of the combining guide rod
30
is placed inside the second insertion groove
26
of the suction valve body
20
, the height of the head unit
31
is lower than the height of the second insertion groove
26
and the outer diameter of the head unit
31
is smaller than the inner diameter of the second insertion groove
26
. In addition, the head unit
31
′ combined to the other end of the combining guide rod
30
is placed inside the hole H formed at the lower end of the cylindrical body unit
11
. Accordingly, the suction valve body
20
can move up and down although the combining guide rod
30
is combined to.
Hereinafter, the operation of the suction gas valve apparatus of the compressor in accordance with the prior art will now be described.
The suction valve body
20
is open and shut by a pressure difference between up and down of the suction valve body
20
and an inertia force due to a motion of the piston
10
. First, as depicted in
FIG. 2
, when the piston
10
transmitted the driving force moves from a upper dead center to a bottom dead center, namely, in an “a” direction, gas flows into a suction hole
15
by a suction force, and the gas is sucked into the cylinder
1
through the first contact surface
21
of the mounting groove
12
and the first valve seat
14
of the suction valve body
20
while the suction valve body
20
moves in “a” direction opposite to the piston moving direction according to the combining guide rod
30
.
And, when the piston
10
moves from a lower dead center to a upper dead center, namely, in a “b” direction, suctioning the gas into the suction hole
15
is stopped, the first contact surface
21
of the suction valve body is mounted on the first valve seat
14
, the lower portion of the second contact surface
22
and the third contact surface
23
are contacted to the second valve seat
19
and are sealed while the suction valve body
20
moves to a lower portion according to the combining guide rod
30
by a pressure, and the gas flowed into the cylinder
1
is compressed
By performing the above-mentioned process, the gas flows into the cylinder
1
.
However, in the above-mentioned structure in accordance with the prior art, because the suction valve body
20
is open and shut only by the pressure difference between up and down of the suction valve body
20
and th
Oh Won-Sik
Park Jung-Sik
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