Pumps – With condition responsive pumped fluid control – Pumped fluid temperature responsive
Reexamination Certificate
2002-06-17
2004-02-03
Koczo, Michael (Department: 3746)
Pumps
With condition responsive pumped fluid control
Pumped fluid temperature responsive
C417S310000, C236S09200D
Reexamination Certificate
active
06685441
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a scroll compressor, and particularly, to a scroll compressor including a protecting device which is able to control temperature in the compressor, as well as to control pressure in the compressor.
2. Description of the Background Art
Generally, various types of compressors can be used according to compressing methods, and a scroll compressor is mainly used for an air conditioner which needs to be small and light weight.
FIG. 1
is a cross-sectional view showing a scroll compressor including a pressure protecting device according to the conventional art.
The scroll compressor according to the conventional art comprises: a casing
106
having a hermetic space and connected a suction pipe
102
for sucking a fluid and a discharge pipe
104
are for discharging compressed fluid respectively; a driving unit
108
disposed on a lower part of the casing
106
for generating a driving force; and a compressed unit
110
disposed on an upper part of the casing
106
and connected to the driving unit
108
by a rotating shaft
112
for compressing the fluid sucked through the suction pipe
102
and for discharging the compressed fluid to the discharging pipe
104
.
A supporting frame
114
for supporting the rotating shaft
112
to be rotatable and supporting the compressed unit
110
is installed in the casing
106
, and a separating panel
120
is installed in the casing
106
to divide the inner area of the casing
106
into a first chamber
116
for maintained a low pressure state and a second chamber
118
for maintained a high pressure state.
The driving unit
108
comprises a stator
122
fixed toward a boundary direction of the casing
106
, and a rotor
124
disposed on an inner circumferential surface of the stator
122
and fixed on the rotating shaft
112
. In addition, when an electric power is applied to the stator
122
, the rotor
124
is rotated by an interaction between the stator
122
and the rotor
124
to rotate the rotating shaft
112
.
The compressed unit
110
includes a fixed scroll
128
having a fixed vane
126
of an involute form and fixed on the separating panel
120
; and an orbiting scroll
132
having an orbiting vane
130
of an involute form corresponding to the fixed vane
126
so that a predetermined compressing chamber is formed between the fixed vane
126
and the orbiting vane
130
, supported by the supporting frame
114
so as to orbit and orbited when the rotating shaft rotates.
A discharging passage
136
through which the fluid compressed by the interaction between the fixed vane
126
and the orbiting vane
130
is discharged toward the second chamber
118
is formed on a center part of the fixed scrolled
128
, and a check valve
138
for preventing the fluid discharged into the second chamber
118
from flowing backward the first chamber
116
is installed on an upper part of the discharging passage
136
.
The check valve
138
includes a valve body
142
, which is fixed on a central upper end of the fixed scroll
128
on which the discharging passage
136
is formed and has a penetrated center part so as to be connected to the discharging passage
136
, and a valve member
144
of a piston type inserted on an inner side of the valve body
142
so as to move in up-and-down direction for blocking the discharging passage
136
by the self weight.
In addition, a pressure protecting device (A) for by-passing the fluid of high pressure in the second chamber
118
to the first chamber
116
in case that the pressure difference between the first and the second chambers
116
and
118
is larger than a predetermined value or in case that the pressure in the first chamber
116
is too low is installed on one side of the separating panel
120
.
As shown in
FIG. 2
, the pressure protecting device (A) comprises: a cylinder
150
for connecting the first chamber
116
and the second chamber
118
; a piston
152
for opening/closing the cylinder
150
as moving in up-and-down direction inside the cylinder
150
; and a spring
154
disposed between one side surface of the piston
152
and the inner wall of the cylinder
150
for providing the piston
152
with a certain elastic force.
The cylinder
150
is fixed on one side of the separating panel
120
, and bypass flow passages
156
through which the fluid of high pressure in the second chamber
118
is by-passed to the first chamber
116
are formed on an upper and lower parts of the cylinder
150
.
The upper surface of the piston
152
is disposed to adhere to the bypass flow passage
156
, and the elastic member
154
is disposed between the lower surface of the piston
152
and the inner wall of the cylinder
150
to provide the piston
152
with the elastic force by which the bypass flow passage
156
is closed.
Operation of the pressure protecting device in the scroll compressor according to the conventional art will be described as follows.
FIG. 3
is a view showing an operational status of the pressure protecting device in the scroll compressor according to the conventional art.
In case that the operational range of the compressor is normal, when the electric source is applied to the driving unit
108
, the rotating shaft
112
rotates to orbit the orbiting scroll
132
, and the fluid sucked into the first chamber
116
through the suction pipe
102
is compressed by the interaction between the orbiting vane
130
and the fixed vane
126
. In addition, the compressed fluid is flowed into the second chamber
118
and discharged to outer side through the discharging pipe
104
.
During the operation of the compressor as described above, if the pressure difference between the first chamber
116
and the second chamber
118
is larger than a predetermined value or if the pressure in the first chamber
116
is lower than a predetermined level, the pressure protecting device is operated to provide the first chamber
116
with the fluid of high pressure in the second chamber
118
, and thereby, the pressure difference between the first chamber
116
and the second chamber
118
is maintained to be an appropriate level.
That is, when the pressure difference between the first chamber
116
and the second chamber
118
becomes larger than pre-set value, the piston
152
moves downward as overcoming the elastic force of the spring
154
by the pressure of the high pressure fluid in the second chamber
118
. Then, the bypass flow passage
156
is opened, and the fluid of high pressure in the second chamber
118
is by-passed to the first chamber
116
to maintain the pressure of the fluid in the first and second chambers
116
and
118
to be the set status.
FIG. 4
is a cross-sectional view showing a state that a temperature protecting device is installed on the scroll compressor according to the conventional art, and
FIG. 5
is a cross-sectional view showing the temperature protecting device according to the conventional art.
The temperature protecting device (B) comprises: a bypass hole
170
penetrating between the first chamber
116
and the second chamber
118
formed on one side of the separating panel
120
; a thermo-disk
172
disposed on an upper surface of the bypass hole
170
; and a cover
174
for supporting both ends of the thermo-disk
172
fixed in the boundary direction of an upper part of the bypass hole
170
. Herein, the thermo-disk is formed as overlapping two members having different thermal deformation rates, and a through hole
176
through which the fluid passes is formed on an upper part of the cover
174
.
FIG. 6
is a view showing an operational status of the temperature protecting device according to the conventional art.
The temperature protecting device (B) maintains the state that the thermo-disk
172
blocks the bypass hole
170
when the compressor is normally operated, and when the temperature in the second chamber
118
is larger than a set value, the thermo-disk is distorted by the heat to open the bypass hole
170
. Then the fluid in the second chamber
118
is by-passed to the f
Koczo Michael
LG Electronics Inc.
Ostrolenk Faber Gerb & Soffen, LLP
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