Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
2002-11-22
2004-09-21
Yu, Justine R. (Department: 3746)
Pumps
Motor driven
Electric or magnetic motor
C092S13000R, C092S13000R
Reexamination Certificate
active
06793470
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a spring support structure of a reciprocating compressor, and more particularly, to a spring support structure of a reciprocating compressor for elastically supporting an armature of a reciprocating motor.
Generally, a reciprocating compressor is to suck, compress and discharge a gas while a piston makes a reciprocal movement within a cylinder.
FIG. 1
is a vertical-sectional view of a reciprocating compressor of a conventional art.
As shown in
FIG. 1
, the conventional reciprocating compressor includes a closed container
10
in which a suction pipe (SP) and a discharge pipe (DP) communicate to each other, a reciprocating motor
20
fixed inside the closed container
10
, a compression unit
30
installed in the closed container
10
and sucking, compressing and discharging a gas, a frame unit
40
supporting the reciprocating motor
20
and the compression unit
30
, and a spring unit
50
elastically supporting the armature of the reciprocating motor
20
in a movement direction and inducing a resonance.
The reciprocating motor
20
includes a stator
21
consisting of an inner stator
21
A and an outer stator
21
B and an armature
22
inserted in an air-gap between the inner stator
21
A and the outer stator
21
B and making a reciprocal movement along with a piston
31
(to be described).
The compression unit
30
includes the piston
31
making a reciprocal movement by being combined to a magnet support member
22
A of the reciprocating motor
20
, a cylinder
32
fixed at a front frame
41
so that the piston
31
is slidably inserted thereto, and forming a compressive space along with the piston
31
, a suction valve
33
mounted at the front end of the piston
31
, opening and closing a gas hole
31
b
of the piston
31
to limit suction of a gas, and a discharge valve assembly
34
mounted at the front end face of the cylinder
32
to cover the compressive space and limit discharging of a compressed gas.
The frame unit
40
includes a front frame
41
supportedly contacting the front side of the inner stator
21
A and the outer stator
21
B, with which the cylinder
32
is insertedly combined, a middle frame
42
supportedly contacting the rear side of the outer stator
21
B, and a rear frame
43
combined with the middle frame
42
to support the rear side of a rear spring
52
(to be described).
The spring unit
50
includes a front spring
51
, both ends of which are supported at the front face of a combining portion of the armature
22
and the piston
31
and its corresponding inner face of the front frame
41
, so as to be inserted into the outer circumference of the cylinder
32
, and a rear spring
52
, both ends of which are supported at a rear face of the combining portion of the armature
22
and the piston
31
and its corresponding front face of the rear frame
43
.
The operation of the conventional reciprocating compressor constructed as described above will now be explained.
When a power is applied to the outer stator
21
B of the reciprocating motor
20
and a flux is formed between the inner stator
21
A and the outer stator
21
B, the armature
22
positioned at an air gap between the inner stator
21
A and the outer stator
21
B is moved in the flux direction to continuously make a reciprocal movement by virtue of the spring unit
50
, and accordingly, the piston
31
combined with the armature
22
makes a reciprocal movement within the cylinder
32
, so that the volume of the compressive space is changed and a coolant gas is sucked into the compressive space, compressed therein and discharged therefrom.
In the sucking stroke of the piston, the coolant gas is sucked into the closed container
10
through the suction pipe (SP), passes through a gas flow passage
31
a
and the gas hole
31
b
of the piston
31
and opens the suction valve
33
so as to be sucked into the compressive space, and, in a compression stroke of the piston, the gas is compressed to a predetermined pressure and then discharged through the discharge pipe (DP) by opening the discharge valve assembly
34
. The series of processes are repeatedly performed.
However, the conventional reciprocating compressor has a problem. That is, as the front spring
51
and the rear spring
52
are arranged in a straight line with the armature
22
therebetween, as shown in
FIG. 2
, the horizontal directional length (L) of the spring should be equivalent to at least the sum of the length (L
1
) of the front spring
51
and the length (L
2
) of the rear spring, causing a problem that the horizontal length of the compressor is lengthened.
In addition, the front spring
51
and the rear spring
52
are both compressive coil springs, which has a property of being deflected in the radial direction while being staggered in the winding direction when it is compressedly tensed. Thus, when the armature
22
and the piston
31
are making a reciprocal movement, they are vibrated in the radial direction due to the characteristics of front spring
51
and the rear spring
52
supporting them, resulting in that a general reliability of the compressor is degraded.
DISCLOSURE OF THE INVENTION
Therefore, an object of the present invention is to provide a spring support structure of a reciprocating compressor that is capable of reducing a horizontal length of a compressor.
Another object of the present invention is to provide a spring support structure of a reciprocating compressor that is capable of reducing a vibration in the radial direction due to a coil spring elastically supporting an armature and a piston of a compressor and improving a stability 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 spring support structure of a reciprocating compressor having a frame unit elastically supported inside a closed container; a reciprocating motor fixed at the frame unit; a compression unit having a piston combined to an armature of the reciprocating motor and a cylinder into which the piston is slidably-inserted to be fixed at the frame unit; and a spring unit supporting a spring support provided at the armature or the piston and guiding a reciprocal movement of the piston, wherein the spring unit includes a plurality of front springs supporting one side of the spring support in parallel and a plurality of the rear springs supporting the other side of the spring support.
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: 133952 (1872-12-01), Quirk
patent: 1372943 (1921-03-01), Constantinesco
patent: 1970963 (1934-08-01), Hose
patent: 3788778 (1974-01-01), Miller
patent: 3813192 (1974-05-01), Adams
patent: 4027211 (1977-05-01), Omura et al.
patent: 6089836 (2000-07-01), Seo
patent: 6413057 (2002-07-01), Hong et al.
patent: 2001-73942 (2001-03-01), None
Han Seong-Joo
Kim Jeong-woo
Song Gye-Young
LG Electronics
Solak Timothy P.
Yu Justine R.
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