Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
2002-06-04
2003-12-30
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C418S069000
Reexamination Certificate
active
06669456
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to scroll compressor, and more particularly, to a scroll compressor, and more particularly, to a scroll compressor having a reversion preventing device that is capable of preventing a driving unit of a compressor from rotating in the opposite direction of a rotational direction to compress a fluid.
2. Description of the Background Art
In general, various types of compressors can be adopted according to a compression method, and a scroll compressor is mostly used for an air-conditioning device that requires a small and light compressor.
FIG. 1
is a sectional view of a scroll compressor in accordance with a conventional art.
As shown in
FIG. 1
, the conventional scroll compressor includes: a casing
106
having a suction pipe
102
for sucking a fluid and a discharge pipe
104
for discharging a compressed fluid that are connected and having a closed certain space; a driving unit
108
disposed at a lower side of the casing
106
and generating a driving force; and a compressing unit
110
disposed at an upper side of the casing
106
, connected to the driving unit
108
and the rotational shaft
112
to compress the fluid sucked into the suction pipe
102
according to the rotation of the rotational shaft
112
and discharge it to the discharge pipe
104
.
A main frame
113
is installed at an upper side of the casing
106
to rotatably support the upper side of the rotational shaft
112
and support the compressing unit
110
, and a lower frame
114
is installed at a lower side of the casing
106
to rotatably supporting the lower side of the rotational shaft
112
.
A separating panel
120
is installed at one side of the casing
106
, sectioning the inside of the casing
106
into a lower pressure side and a high pressure side.
The driving unit
108
includes a stator
122
fixed in the circumferential direction of the casing
106
and a rotor
124
disposed at the inner circumferential face of the stator
122
and fixed at the rotational shaft
112
, so that when power is applied to the stator
122
, the rotor
124
is rotated according to the interaction between the stator
122
and the rotor
124
, to thereby rotate the rotational shaft
112
.
The compressing unit
110
includes a fixed scroll
127
having a fixed vane
126
in an involute shape and being fixed at the separating panel
120
; and an orbiting scroll
132
having an orbiting vane
130
in an involute shape corresponding to the fixed vane
126
to have a certain compression space between itself and the fixed vane
126
, being orbitably supported by the support frame
114
, and orbiting when the rotational shaft
112
is rotated.
A discharging passage
136
is formed at the central portion of the fixed scroll
128
to discharge the fluid compressed according to the interaction between the fixed vane
126
and the orbiting vane
130
, and a check valve
138
is installed at an upper side of the discharging passage
136
to prevent reversion of the discharged fluid.
In the above-described conventional scroll compressor, when power is applied to the stator
122
, the rotor
124
is rotated according to the interaction between the stator
122
and the rotor
124
, and the rotational shaft
112
fixed at the rotor
124
is rotated in a normal direction.
Then, the orbiting scroll
132
is moved in an orbiting manner according to the rotation of the rotational shaft
112
, to compress the fluid sucked through the suction pipe
102
owing to the interacton with the fixed scroll
127
and discharge outwardly the compressed fluid through the discharge pipe
104
.
At this time, the fluid discharged to the high pressure side through the discharging passage
136
is prevented from reversing by the check valve
138
installed at the discharging passage
136
.
The upper side and lower side of the rotational shaft
112
are rotatably supported by the main frame
114
and the lower frame
114
, respectively, and rotated in the normal direction according to the driving of the driving unit
108
.
However, the conventional scroll compressor has the following problem.
That is, in case of employing a single phase motor as the driving unit generating the rotational force, if a load generated during the operation of the compressor becomes greater than a motor torque, the rotational force of the motor is reduced, and moreover, the motor is reversely rotated, causing an abnormal vibration of the compressor and an abnormal noise, resulting in that a reliability of the compressor is degraded.
In addition, in case of employing a three phase motor as the driving unit generating the rotational force, if a connection of the motor is made erroneously, the motor is rotated in a reverse direction, causing an abnormal vibration and a noise, also resulting in that a reliability of the compressor is degraded.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a scroll compressor having a reversion preventing device in which when a driving unit of a compressor is rotated in a normal direction, the rotation is allowed, while when the driving unit is rotated in a reverse direction, its rotation is stopped, thereby preventing occurrence of an abnormal vibration and noise of the driving unit and improving a reliability 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 scroll compressor having a reversion preventing device including: a driving unit inserted in a closed casing and generating a driving force; a compressing unit for compressing and discharging a fluid when the driving unit is driven; a rotational shaft rotatably supported by a main frame and a sub-frame that are fixed at the casing and transmitting the rotational force generated from the driving unit to the compressing unit; and a reversion preventing device installed at one side of the rotational shaft and stopping the rotation of the rotational shaft when the driving unit is rotated in a direction opposite to the direction in which the driving unit compresses the fluid.
The reversion preventing device of the scroll compressor of the present invention includes: an eccentric part formed eccentrically as long as a certain distance from the center of the rotational shaft at one side of the rotational shaft; an eccentric ring rotatably inserted in a certain range into the eccentric part, and formed such that the center of an inner diameter is eccentric as long as a certain distance from the center of an outer diameter; a supporting part formed to be corresponded to the center of the rotational shaft at an outer side of the rotational shaft, so as to limit a rotational range of the eccentric ring; and a stopper protruded upwardly from the lower frame and interfering the eccentric ring when the rotational shaft is rotated in a reverse direction.
In the scroll compressor having a reversion preventing device of the present invention, the eccentric part of the reversion preventing device is formed as a disk type having a radius larger than the radius of the rotational shaft at the outer circumferential surface of the rotational shaft, and the center of the eccentric part is eccentric as long as a certain distance from the center of the rotational shaft.
In the scroll compressor having a reversion preventing device of the present invention, the supporting part of the reversion preventing device is formed as a disk type extended in a right angle direction of the rotational shaft from the lower surface of the eccentric part, and a hinge pin is protruded upwardly from the upper side of the opposite side of the portion that is eccentric of the eccentric part.
In the scroll compressor having a reversion preventing device of the present invention, the supporting part of the reversion preventing device has a radius larger than that of the eccentric part, and the center of the supporting part is corresponded to the center of the rotational shaft.
In the scroll
Denion Thomas
LG Electronics Inc.
Ostrolenk Faber Gerb & Soffen, LLP
Trieu Theresa
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