Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
2002-05-28
2004-02-24
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C418S055600, C418S057000
Reexamination Certificate
active
06695600
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a scroll compressor enabling to prevent the breakage of a scroll by coping suitably with a volume variation working in a radial direction of a compressing chamber as well as improve a reliance of the compressor.
2. Background of the Related Art
Generally, a scroll compressor is an apparatus of compressing a fluid by varying a volume of a compressing chamber formed by a pair of scroll compressors. Compared to a reciprocating compressor or a rotary compressor, the scroll compressor has a high efficiency as well as a low noise. And, the light-weighted and small-sized scroll compressor can be manufactured, thereby enlarging its applied fields gradually.
FIG. 1
illustrates a cross-sectional view of a scroll compressor according to a related art, and
FIG. 2
illustrates a magnified cross-sectional view of a part ‘A’ on FIG.
1
.
Referring to
FIG. 1
, a scroll compressor according to a related art includes a casing
106
having a hermetic space wherein a suction pipe
102
sucking a fluid and a discharge pipe
104
discharging a compressed fluid are connected to an upper side and a lateral side, respectively, a driving unit
108
arranged at lower side of the casing
106
so as to generate a driving power, and a compressing unit
112
arranged at the upper side of the casing
106
and connected to the driving unit
108
and a crankshaft
110
so as to carry out a compression of a fluid.
The driving unit
108
includes a stator
114
fixed in a circumferential direction of the casing
106
and a rotor
116
arranged at an inner circumference face of the stator
114
so as to be fixed to the crankshaft
110
. Once an electric power is applied to the stator
114
, the crankshaft
110
revolves by a reciprocal reaction between the stator
114
and rotor
116
.
The compressing unit
112
includes a fixed scroll
120
having an involute fixed wrap
118
and connected to the suction pipe
102
so as to be connected to the upper side of the casing
106
and an orbiting scroll
124
having an involute orbiting wrap
122
corresponding to the fixed wrap
118
so as to be connected to the crankshaft
110
eccentrically, wherein a uniform compressing chamber is provided between the fixed and orbiting scrolls
120
and
124
.
The crankshaft
110
is supported by a main frame
128
fixed to the upper side of the casing
106
so as to revolve. An eccentric part
132
inserted in a boss
130
of the orbiting scroll
124
to make the orbiting scroll
124
circle round is formed at the upper side of the crankshaft
110
. And, an oil flow path
134
is formed in a shaft direction so as to supply a frictional part between the orbiting scroll
124
and the eccentric part
132
with the oil filling the lower side of the casing
106
.
A back pressure chamber
136
is formed between the main frame
128
and orbiting scroll
124
so as to forming a medium pressure between sucking and discharging pressures generated from inflow and outflow of the compressed fluid. And, an Oldham ring
138
is installed at a lower face of the orbiting scroll
124
so as to prevent the rotation of the orbiting scroll
124
.
A seal ring
140
is inserted between the eccentric part
132
of the crankshaft
110
and the boss
130
of the orbiting scroll
124
so as to prevent the oil sucked through the oil flow path
134
from flowing out to the back pressure chamber
136
.
Operation of the above-constructed scroll compressor according to a related art is explained as follows.
Once the electric power is applied to the driving unit
108
, the crankshaft
110
connected to the rotor
116
starts revolving. And, the eccentric part
132
revolves so as to make the orbiting scroll
124
circle round. The fluid having flowed in the compressing chamber
126
through the suction pipe
102
moves to be compressed to a central part of the compressing chamber
126
by the circling movement of the orbiting scroll
124
, and then the compressed fluid is discharged inside the casing
106
through a discharge outlet
142
. The fluid discharged through the discharge outlet
142
at high pressure is discharged externally through the discharge pipe
104
connected to the lateral side of the casing
106
.
When the fluid discharged inside the casing
106
at the high pressure pressurizes the oil stored in the lower side of the casing
106
, the pressurized oil is supplied between the boss
130
of the orbiting scroll
124
and the eccentric part
132
along the oil flow path
134
so as to carry out a lubrication as well as pressurizes the orbiting scroll
124
upward so as to maintain a close adherence between the orbiting and fixed wraps
112
and
118
.
In this case, a cross-sectional area of the eccentric part
132
is made to be equal to that of the crankshaft
110
so that there occurs no load in a shaft direction. Namely, a pressure of the oil pressurizing the eccentric part
132
downward is equal to that of the fluid pressurizing the crankshaft
110
upward, thereby the load fails to work on the crankshaft
110
in the shaft direction.
Unfortunately, the above-explained scroll compressor according to the related art has the crankshaft and eccentric part of which cross-sectional areas are equal to each other as well as the orbiting scroll fails to move in a radial direction. When a incompressible fluid such as a liquefied refrigerant, oil or particles flows in the compressing chamber so as to increase an inner pressure of the compressing chamber abnormally, a volume of the compressing chamber fails to vary in the radial direction. Therefore, the orbiting and fixed wraps of the orbiting and fixed scrolls are broken as well as a torsion stress is concentrated on the driving unit or crankshaft.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a scroll compressor that substantially obviates one or more problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide a scroll compressor coping properly with a volume variation of a compressing chamber due to an inflow of an incompressible fluid or the like by installing a radial moving apparatus enabling an orbiting scroll to move radially between an eccentric part of a crankshaft and the orbiting scroll so as to prevent the breakage of the scroll and improve a reliance of the compressor.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a scroll compressor according to the present invention includes a casing having a high pressure inside, a driving unit arranged at a lower side of the casing and connected to a crankshaft so as to generate a driving force, a compressing unit having an orbiting scroll connected to the crankshaft eccentrically and a fixed scroll so as forming a compressing chamber between the orbiting and fixed scrolls, and a compliance means for retreating the orbiting scroll in a radial direction when an incompressible material flows in the compressing chamber, the compliance means installed between the compressing unit and the crankshaft.
Preferably, an oil flow path is formed to penetrate the crankshaft in a length direction and an eccentric part is formed at an upper side of the crankshaft so a to have a cross-sectional area smaller than that of the crankshaft.
More preferably, the compliance means is a compliance member inserted in an inner circumference face of a boss formed at a lower face of the orbiting scroll so as to revolve, a slot penetrates a
Chang Yuong-Il
Koo In-Hwe
Denion Thomas
LG Electronics Inc.
Trieu Theresa
LandOfFree
Scroll compressor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Scroll compressor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scroll compressor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3280121