Pumps – Motor driven – Resiliently mounted pump or motor
Reexamination Certificate
2000-08-23
2002-11-26
Freay, Charles G. (Department: 3746)
Pumps
Motor driven
Resiliently mounted pump or motor
C417S902000
Reexamination Certificate
active
06485271
ABSTRACT:
TECHNICAL FIELD
The present invention relates, in general, to motored compressors and, more particularly, to a body supporting apparatus for such motored compressors designed to support a frame in a compressor while minimizing operational vibration of the frame, thus improving the operational reliability of such compressors.
BACKGROUND ART
FIG. 1
shows the internal construction of a conventional motored compressor. As shown in the drawing, the conventional motored compressor comprises a hermetic housing
1
consisting of upper and lower casings
1
t
and
1
b
, with a plurality of desired parts constituting the motored compressor being set within the interior of the housing
1
. For example, a frame
2
is set within the interior of the housing
1
. A stator
3
is fixedly mounted to the frame
2
while being held at a desired position by a spring
3
S.
FIG. 2
shows a structure for holding the stator
3
on the frame by the spring
3
S in detail. As shown in the drawing, the upper end of the spring
3
S is inserted into a seat spring
3
′ provided on the lower surface of the stator
3
, while the lower end of the spring
3
S is inserted into a seat spring
1
b
′ of the lower casing
1
b
. In the above structure, the seat spring
1
b
′ of the lower casing
1
b
also acts as a stopper used for limiting the downward vibration of the stator
3
. That is, the lower end of the seat spring
3
′ comes into contact with the upper end of the other seat spring
1
b
′, thus allowing the seat spring
1
b
′ to collaterally act as a stopper for limiting the downward vibration of the stator
3
.
On the other hand, a crankshaft
5
is installed within the hermetic housing
1
while passing through the central portion of the frame
2
, while a rotor
4
is integrated with the crankshaft
5
into a single structure. The above rotor
4
is electromagnetically rotated along with the crankshaft
5
in cooperation with the stator
3
.
An eccentric pin
5
b
is provided on the upper end of the crankshaft
5
while being eccentric from the rotating axis of the crankshaft
5
. A balance weight
5
c
is provided on the crankshaft
5
at a position opposite to the eccentric pin
5
b
. The above crankshaft
5
is rotatably held on the frame
2
.
An oil passage
5
a
is formed in the crankshaft
5
and guides lubrication oil L from the bottom of the hermetic housing
1
to the upper portion of the frame
5
prior to spraying the oil at the upper portion of the frame
5
. In addition, a pump
5
d
is provided on the lower end of the crankshaft
5
and generates pumping force for sucking the lubrication oil L from the bottom of the housing
1
to the oil passage
5
a
of the crankshaft
5
.
On the other hand, a cylinder
6
, having a compression chamber
6
′, is integrated with the frame
2
into a single structure, with a piston
7
being set in the compression chamber
6
′ of the cylinder
6
. The above piston
7
is connected to the eccentric pin
5
b
of the crankshaft
5
through a connecting rod
8
. A valve assembly
9
is installed on the end of the cylinder
6
. This valve assembly
9
controls a flowing of refrigerant which is sucked into and exhausted from the compression chamber
6
′ of the cylinder
6
. A head cover
10
is mounted to the valve assembly
9
. In the head cover
10
, a suction muffler
11
is connected to the valve assembly
9
and introduces the refrigerant into the compression chamber
6
′ through the valve assembly
9
.
In the drawings, the reference numeral
12
denotes a suction pipe used for leading the refrigerant into the interior of the hermetic housing
1
, and the reference numeral
13
denotes an exhaust pipe used for discharging the compressed working fluid from the compressor into the outside of the compressor.
The above-mentioned motored compressor is operated as follows. When the compressor is electrically activated, the rotor
4
is electromagnetically rotated in cooperation with the stator
3
. The crankshaft
5
, integrated with the rotor
4
, is thus rotated along with the rotor
4
. When the crankshaft
5
is rotated as described above, the eccentric pin
5
b
is rotated along with of the crankshaft
5
while forming a circular trace around the shaft
5
. In addition, the connecting rod
8
, connected to the eccentric pin
5
b
, is driven by the pin
5
b
, thus allowing the piston
7
to perform a linear reciprocating action within the compression chamber
6
′ of the cylinder
6
. Due to such a linear reciprocating action of the piston
7
within the compression chamber
6
′, the refrigerant is compressed.
During such an operation of the compressor, the stator
3
is may be undesirably vibrated due to several causes, for example, a rotating action of both the rotor
4
and the crankshaft
5
and a linear reciprocating action of the piston
7
. The conventional motored compressor is thus designed to reduce such a vibration of the stator
3
using the spring
3
S, which holds the stator
3
on the lower casing
1
b.
However, the conventional support structure, designed to simply support the stator
3
on the lower casing
1
b
using the spring
3
S, is problematic in that it fails to effectively reduce the vibration of the stator
3
. In an effort to overcome such a problem, another support structure of
FIG. 3
is proposed.
In the support structure of
FIG. 3
, a stator
3
is held on the lower casing
1
b
using two springs
3
S
1
and
3
S
2
, with a connection member M being used for connecting the two springs
3
S
1
and
3
S
2
. When the two springs
3
S
1
and
3
S
2
are connected to each other using the connection member M, it is possible to remarkably improve the elastic vertical support characteristics V of the springs
3
S
1
and
3
S
2
holding the stator
3
on the lower casing
1
b
. However, this support structure has a problem in elastic lateral support characteristics C of the springs
3
S
1
and
3
S
2
. Therefore, the lateral movement of the stator
3
is gradually increased during an operation of the motored compressor, and so the frame
2
and/or the stator
3
are undesirably brought into partial contact with the interior surface of the hermetic housing
1
.
In addition, the connection member M undesirably forms two gaps G
1
and G
2
between the connection member M and the two seat springs
3
′ and
1
b
′ of both the stator
3
and the lower casing
1
b
, with the two gaps G
1
and G
2
requiring a special precise management. That is, the presence of the connection member M between the two seat springs
3
′ and
1
b
′ in the support structure undesirably forces a user to more precisely manage the two gaps G
1
and G
2
and to allow the connection member M along with the two seat springs
3
′ and
1
b
′ to act as a stopper.
DISCLOSURE OF THE INVENTION
Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a body supporting apparatus for motored compressors, which is designed to support a frame in a hermetic housing while desirably reducing operational vibration of the frame.
In order to accomplish the above object, the present invention provides a body supporting apparatus for motored compressors, comprising a stator installed on the frame of a motored compressor, the frame having a vibration source, an elastic member connected to the stator so as to support the stator, a fixed support part fixedly installed relative to the stator and used for supporting the elastic member, and a guider installed at the middle portion of the elastic member and used for guiding an elastic movement of the elastic member.
In the above body supporting apparatus, the guider receives the middle portion of the elastic member therein, thus intercepting an undesirable elastic lateral movement of the elastic member.
The body supporting apparatus for motored compressors of this invention is designed to intercept an undesirable lateral movement of a
Freay Charles G.
LG Electronics Inc.
Rodriguez William
LandOfFree
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