Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
2002-01-04
2004-01-13
Freay, Charles G. (Department: 3746)
Pumps
Motor driven
Electric or magnetic motor
C417S415000, C417S440000, C417S441000, C417S545000
Reexamination Certificate
active
06676388
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a gas compression apparatus for reciprocating compressor, and more particularly, to a gas compression apparatus for reciprocating compressor that is capable of controlling a piston stroke distance to control a compression amount of a compressed refrigerant gas and capable of minimizing a dead volume.
2. Description of the Background Art
In general, a compressor compresses a fluid. A reciprocating compressor of the present invention is operated that a piston directly connected to a motor which generates a linear reciprocal driving force is linearly and reciprocally moved within a cylinder, so as to compress a refrigerant gas.
As shown in
FIG. 1
, the reciprocating compressor includes a closed container
10
, a reciprocating motor
20
installed in the closed container
10
and generating a linear reciprocal driving force, a rear frame
30
and a middle frame
40
respectively supporting both sides of the motor
20
, a front frame
50
coupled to one side of the middle frame
40
, a cylinder
60
for being coupled to the front frame
50
to have a predetermined distance along an axial direction with the reciprocating motor
20
; a piston
70
connected to the reciprocating motor
20
and inserted into the cylinder
60
, making a linear reciprocal movement in the cylinder
60
upon receiving the linear reciprocal driving force of the reciprocating motor
20
; a valve assembly
80
combined to the cylinder
60
and the piston
70
and sucking and discharging gas into the cylinder according to a pressure difference generated by the reciprocation movement of the piston
70
; and a resonance spring unit
90
elastically supporting the linear reciprocal movement of the reciprocating motor
20
and the piston
70
.
The reciprocating motor
20
includes a cylindrical outer stator
21
fixedly coupled to the rear frame
30
and the middle frame
40
; an inner stator
22
inserted into the outer stator
21
with a certain distance; a winding coil
23
wound inside the outer stator
21
; and an armature (A) inserted to be linearly and reciprocally movable between the outer stator
21
and the inner stator
22
with a certain distance, respectively.
The armature (A) includes a cylindrical magnet holder
24
, and a plurality of permanent magnets
25
coupled to the outer circumferential face of the magnet holder
24
along the circumferential direction at regular intervals. The armature (A) is coupled to the piston
70
.
The resonance spring unit
90
includes a support
91
formed bent to have a predetermined area, one side thereof being coupled to one face of the piston
70
or the armature (A) so that the support can be positioned between the front frame
50
and the middle frame
40
, a front spring
92
positioned between the front frame
50
and the support
91
, and a rear spring
93
positioned between the support
91
and the middle frame
40
.
The valve assembly
80
includes a discharge cover
81
covering the compression space (P) of the cylinder
60
, a discharge valve
82
being positioned inside the discharge cover
81
and opening and closing the compression space (P) of the cylinder
60
, a valve spring
83
elastically supporting the discharge valve
82
, and a suction valve
84
coupled at an end portion of the piston
70
and opening and closing a refrigerant suction passage (F) formed in the piston
70
.
A discharge pipe
2
is coupled at one side of the discharge cover
81
to guide gas compressed to a high temperature and high pressure to be discharged, and a suction pipe
1
for guiding the refrigerant gas to be introduced into the closed container
10
is coupled at one side of the closed container
10
so as to be positioned at the side of the rear frame
30
.
The operation of the conventional reciprocating compressor constructed as described above will now be explained.
First, when current flows through the winding coil
23
as a power is supplied to the reciprocating motor
20
, the armature (A) having the permanent magnet
25
is linearly and reciprocally moved owing to the interaction between the magnetic flux formed at the outer stator
21
and the inner stator
22
by the current flowing through the winding coil
23
and the permanent magnet
25
.
As the linear reciprocal driving force of the armature (A) is transferred to the piston
70
, the piston
70
is linearly and reciprocally moved in the compression space (P) inside the cylinder, and at the same time, the valve assembly
80
is operated so that gas is sucked into the compression space (P) of the cylinder, compressed and discharged. And this process is repeatedly performed.
The spring unit
90
stores and discharges the linear reciprocal kinetic movement force of the reciprocating motor
20
as an elastic energy and causes a resonance movement.
As shown in
FIG. 2
, the reciprocating compressor is assembled with its initial position (a) set in such a manner that the end portion of the piston
70
positioned inside the cylinder
60
is positioned at the center of a maximum upper dead point (H
max
) and a maximum lower dead point (L
max
), of which the distance between the two points is a maximum stroke distance (S
max
).
In general, as a voltage of a power is controlled, an arbitrary stroke distance (S
1
) between an arbitrary upper dead point (H
1
) and an arbitrary lower dead point (L
1
) is moved with reference to the initial position (a), the right center of the maximum upper dead point (H
max
) and the maximum lower dead point (L
max
), so as to compress the refrigerant gas.
That is, in case where a relatively much amount of refrigerant gas is to be compressed and discharged in the compression space (P) of the cylinder
60
, as shown in
FIG. 3
, the stroke distance (S
2
) of the piston
70
is increased, though shorter than the maximum stroke distance (S
max
), to increase the amount of the compressed refrigerant gas.
Meanwhile, if a relatively small amount of refrigerant gas is to be compressed and discharged in the compression space (P) of the cylinder
60
, as shown in
FIG. 4
, the stroke distance (S
3
) of the piston
70
is made to be smaller.
At this time, the piston is moved on the basis of the initial position (a), the right center of the maximum upper dead point (H
max
) and the maximum lower dead point (L
max
). Thus, if the stroke distance of the piston
70
is made to be larger, the distance between the upper dead point
70
of the piston and the bottom surface of the discharge valve
82
, that is, a top-clearance, is shortened. Meanwhile, if the stroke distance of the piston
70
is made to be smaller, the top-clearance, that is, the distance between the upper dead point
70
of the piston and the discharge valve
82
, is lengthened.
However, though the conventional structure has an advantage in that the compression amount of the refrigerant gas can be controlled by controlling the stroke distance of the piston under the voltage control, so that the gas can be compressed as much as desired, since the piston is always moved along the stroke distance set on the basis of the initial position, the middle between the maximum upper dead point and the maximum lower dead point, the top-clearance is increased. Due to the increased top-clearance, a dead volume is increased, degrading a compression efficiency.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a gas compression apparatus for reciprocating compressor that is capable of controlling a piston stroke distance for a compression amount control of a refrigerant gas and capable of minimizing a dead volume.
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 compression apparatus for reciprocating compressor including: a reciprocating motor generating a linear reciprocal driving force; a compressing cylinder positioned with a predetermined distance from the reciprocating motor; a position controlling cylin
Heo Jong Tae
Lee Hyeong Kook
Birch & Stewart Kolasch & Birch, LLP
Freay Charles G.
LG Electronics Inc.
Rodriquez William H.
LandOfFree
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