Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
2002-01-08
2003-12-23
Tyler, Cheryl J. (Department: 3746)
Pumps
Motor driven
Electric or magnetic motor
C417S552000, C417S545000, C417S555100, C091S422000, C137S533310
Reexamination Certificate
active
06666663
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a compressing apparatus of refrigerant gas for a reciprocating compressor and particularly, to a gas suction apparatus for a reciprocating compressor capable of improving compressing performance of refrigerant gas and reliability of components.
2. Description of the Background Art
Generally, a compressor is an instrument for compressing fluid such as air and refrigerant gas. The compressor generally includes a driving unit installed in a closed container, for generating a driving force and a compressing unit for sucking and compressing refrigerant gas by receiving the driving force of the above driving unit and is classified into a rotary compressor, reciprocating compressor and a scroll compressor according to the structure of the compressing unit.
The reciprocating compressor among them is a compressor in which a driving force of the driving unit is transmitted to the piston and the piston sucks and compresses refrigerant gas performing linear reciprocating movement in a cylinder.
FIGS. 1 and 2
show an embodiment of the compressing unit of the reciprocating compressor and the compressing unit of the reciprocating compressor includes a cylinder
10
where a through hole
11
forming a compression space P inside the hole is formed, a piston inserted in the through hole
11
of the cylinder
10
enabling linear reciprocating movement and a discharge valve assembly
30
combined to the end portion of the cylinder
10
to cover the through hole
11
.
The piston
20
has a head portion
22
at one side of the body portion
21
having a certain length and a connection portion
23
extended into a certain area at the other side of the body portion
21
. In the body portion
21
, a first gas passage
24
having a certain depth is formed in the body portion
21
and in the head portion, a second gas passage
25
is formed.
The first gas passage
24
is composed of a hole and the second gas passage
25
is composed of a plurality of through holes.
A suction valve
40
for opening and closing the second gas passage
25
is positioned in the head portion
22
and the connection portion
23
of the piston
20
is connected into the driving unit for generating a driving force.
On the other hand, the suction valve
40
is composed of a thin plate in a round form and has a dissection portion
41
is positioned inside the valve. The suction valve is divided into a fixing portion
42
and opening and closing portion
43
by the dissection portion
41
.
The suction valve
40
is fixed-combined to the head portion
22
having a fixing bolt
50
penetrated by the fixing portion
42
under the condition that the valve is contacted on the end surface of the head portion
23
of the piston
20
.
Also, the discharge valve assembly
30
includes a discharge cover
31
combined to cover the end portion of the cylinder
10
, a discharge valve
30
inserted in the discharge cover
31
, for opening and closing the compression space P formed by the through hole
11
and piston
20
of the cylinder
10
and a valve spring
33
for elastically supporting the discharge valve
32
.
In the operation of the compressing unit of the above reciprocating compressor, first, a driving force of the driving unit is transmitted to the piston
20
and the piston
20
performs linear reciprocating movement in the cylinder
10
.
In the process, as shown in
FIG. 3
, when the piston
20
moves to the direction of a bottom dead point a, the discharge valve
32
is contacted on the end portion of the cylinder
10
by pressure difference and blocks the compression space P. At the same time, the suction valve
40
combined to the piston
20
is bent and open the second gas passage
25
, thus to suck refrigerant gas to the compression space P formed in the cylinder
10
through the first gas passage
24
and the second gas passage
25
of the piston
20
.
When the piston
20
moves to an upper dead center (b) after reaching the bottom dead center (a), the suction valve
40
is restored to the former condition and the second gas passage
25
of the piston
20
is closed, thus to compress refrigerant gas sucked to the compression space P formed in the cylinder
10
. When the piston
20
reaches the top dead center (b), the discharge valve
32
is opened and the compressed refrigerant gas is discharged.
As the above process is repeated continuously, refrigerant gas is compressed.
However, in the above structure, since the suction valve
40
formed as a thin plate is fixed-combined by the fixing bolt
50
, the head portion of the fixing bolt
50
is positioned in the compression space P in the protruded form and accordingly, a dead volume is generated, thus to decline compressing efficiency. Also, position sensing of the top dead center (b) and bottom dead center (a) of the piston
20
is difficult and accordingly, controlling of a stroke of reciprocating movement of the piston
20
becomes difficult.
Since the suction valve
40
formed as a thin plate is combined by the fixing bolt
50
, design of the second gas passage
25
is limited. Namely, in case the flowing cross section of the second gas passage
25
is large, the flowing cross section where the refrigerant gas flows becomes large. However, the suction valve
40
formed as a thin plate could be damaged by an excessive suction pressure in bending the valve and in case the size of the flowing cross section of the second gas passage
25
is small, the flowing resistance of refrigerant gas could be increased by the small cross section.
As the piston
20
moves, in the process that the suction valve
40
is repeated opened or closed, a slip rotation is generated between the suction valve
40
and the fixing bolt
50
and accordingly, compressing performance could not be performed well since the piston
20
is seceded from the second gas passage
25
.
Also, as the suction valve
40
was bent and restored to its former state, the second gas passage
25
is opened or closed and accordingly, a fatigue crack is generated and a screw hole
44
for combining the fixing bolt
50
is formed at the bending portion of the suction valve
40
. Therefore, structural strength was declined.
As a structure for making up for the above disadvantage, as shown in
FIG. 4
, an embodiment that the fixing portion
42
of the suction valve
40
is directly welded-connected to the end surface of the head portion
22
of the piston
20
is disclosed.
With such structure, the dead volume can be reduced and control of a stroke is eased but, characteristic of the material is changed by heat transformation by welding heat for welding the suction valve
40
on the head portion
22
of the piston
20
. When the opening and closing operation of the suction valve
40
is continuously performed, cracks by fatigue are generated centering around the welding point, thus to decrease reliability of the compressor.
SUMMARY OF THE INVENTION
Therefore, the present invention provides a gas suction apparatus for a reciprocating compressor which can make the suction of refrigerant gas smoothly and increase structural combining strength.
Also, another object is to provide a gas suction apparatus for a reciprocating compressor which can minimize dead volume of a compression space of refrigerant gas and ease controlling of a stroke.
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 gas suction apparatus for a reciprocating compressor comprising a piston having a gas flowing passage where refrigerant gas flows, being inserted in the compression space formed in a cylinder enabling linear reciprocating movement, a fixing means combined to the piston, an inertia valve including a valve cone portion formed to have a larger area than the cross section of the gas flowing passage and a certain thickness, for opening and closing the gas flowing passage, being contacted on the end surface of the piston or separated, a valve body portion exten
Kim Hyung Jin
Lee Hyeong Kook
Lee Hyuk
Oh Won Sik
Birch & Stewart Kolasch & Birch, LLP
LG Electronics Inc.
Sayoc Emmanuel
Tyler Cheryl J.
LandOfFree
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