Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
2002-07-03
2004-05-04
Yu, Justine R. (Department: 3746)
Pumps
Motor driven
Electric or magnetic motor
C417S363000, C417S902000
Reexamination Certificate
active
06729861
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a reciprocating compressor and particularly, to a reciprocating compressor, capable of enabling miniaturization of a compressor as a diameter of a compressor can be reduced and attenuating the installation space of the compressor.
2. Description of the Background Art
Generally, a compressor is an instrument for compressing fluid such as air and refrigerant gas and is classified into many kinds of compressors, such as a rotary compressor, reciprocating compressor, a scroll compressor and the like, according to the structure of the compressing method.
FIG. 1
is a longitudinal sectional view showing a reciprocating compressor in accordance with the conventional art,
FIG. 2
is a longitudinal sectional view showing an arrangement structure of a spring of the reciprocating compressor in accordance with the conventional art and
FIG. 3
is a cross-sectional view taken along section line III—III of FIG.
2
.
The reciprocating compressor in accordance with the conventional art includes a hermetic casing
10
which is connected with a suction tube
12
to which gas is sucked and discharging tube
14
, a driving motor
30
which is positioned inside the hermetic casing
10
, for generating a reciprocating driving force, a compressing unit
40
for compressing gas moving reciprocatingly by receiving the driving force of the driving motor
30
and a plurality of frames which are fixed inside the hermetic casing, for supporting the driving motor
30
and compressing unit
40
.
The driving motor
30
includes a cylindrical outer core
31
, an inner core
32
which is positioned at a predetermined interval with the inner circumferential surface of the outer core
31
, a winding coil
35
which is wound inside the outer core
31
and to which a power source is supplied from the outside, a magnet
33
which is positioned between the outer core
31
and inner core
32
at a predetermined interval and performs a linear reciprocating movement when the power source is supplied to the winding coil
35
.
The compressing unit
40
includes a piston
42
which is connected with the magnet
33
by a magnet holder
34
, a cylinder
41
in which the piston
42
is inserted slidably, for forming a predetermined compression space, and a valve assembly
44
positioned at the front of the cylinder
41
, for performing opening and closing operations for the discharged gas.
Here, a first frame
21
is fixed on the outer circumferential surface of the cylinder
41
and the second and third frames
22
and
23
are supported on the both surfaces of the outer core
31
.
The first frame
21
and second frame
22
are connected to each other by a connection member
24
and the second and third frames
22
and
23
are connected to each other by a bolt
61
. The piston
42
is connected to the portion between the first and second frames
21
and
22
, and a spring seat member
53
which performs a reciprocating movement together is positioned therein. A first spring
51
for giving an elastic force in the direction that the piston
42
moves backwards is positioned between a side surface of the first frame
21
and a side surface of the spring seat member
53
, and a second spring
52
for giving an elastic force in the direction that the piston
42
moves forwards is positioned between the spring seat member
53
and second frame
22
.
Here, the first spring
51
is mounted between an inner surface of a portion which is connected with the connection member
24
of the first frame
21
and a side surface of the spring seat member
53
, stores an elastic force when the piston
42
moves forwards and gives the force when the piston
42
moves backwards. The second spring
52
is mounted between an another surface of a spring seat member
53
and a side surface of the second frame
22
, stores an elastic force when the piston
42
moves forwards and gives the force when the piston
42
moves backwards.
Such reciprocating compressor has been gradually miniaturized and accordingly technology for miniaturizing the compressor maintaining an identical operation performance is required.
Therefore, the technology for miniaturizing the diameters of the first, second and third frames has become more influential, since the diameter of the hermetic casing is determined by the diameters of the first, second and third frames.
However, since the first and second springs are mounted on the inner surface of a part which is connected with the connection member of the first frame, diameter of each frame must be maintained larger than a predetermined level. Therefore, it is impossible to reduce the diameter, and accordingly the diameter of the compressor is larger than a predetermined level, thus to require larger installation space where the compressor is positioned and increase manufacturing cost of the compressor.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a reciprocating compressor, capable of reducing a diameter of a compressor by reducing diameters of frames, thus to miniaturize the compressor and substantially reduce the installation space of the compressor.
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 reciprocating compressor, including a compressing unit fixed by a first frame inside a hermetic casing, for compressing gas, a driving motor fixed by a second frame and a third frame inside the hermetic casing, a spring seat member connected with a piston of the compressing unit and positioned between the first frame and the second frame, a plurality of connection members respectively connecting the first and second frame and having a predetermined space in the circumferential direction of the first and second frame, a first spring installed between the first frame and the spring seat member and a second spring installed between the spring seat member and the second frame, wherein each end of the first and second springs is positioned in a space among the connection members.
Further, there is provided a reciprocating compressor wherein the second and third frames are connected by a plurality of bolts and the bolts are inserted into a plurality of through holes circumferentially formed in a outer core of the driving motor.
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: 5772410 (1998-06-01), Chang
patent: 6435842 (2002-08-01), Song
patent: 2002/0057974 (2002-05-01), Toyama et al.
patent: 2002/0164255 (2002-11-01), Burr et al.
patent: 2003/0095879 (2003-05-01), Oh et al.
patent: 2003/0129069 (2003-07-01), Bae et al.
patent: 2003/0133812 (2003-07-01), Puff et al.
Kim Hyung-Jin
Lee Hyuk
Oh Won-Sik
Birch & Stewart Kolasch & Birch, LLP
LG Electronics Inc.
Sayoc Emmanuel
Yu Justine R.
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