Pumps – With condition responsive pumped fluid control – Pressure responsive relief or bypass valve
Reexamination Certificate
2002-01-30
2003-12-09
Tyler, Cheryl J. (Department: 3746)
Pumps
With condition responsive pumped fluid control
Pressure responsive relief or bypass valve
C137S513000, C137S521000, C137S112000
Reexamination Certificate
active
06659735
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a scroll compressor, and in particular to a scroll compressor which is capable of simplifying a structure of a valve, decreasing a size of a whole compressor and lowering a noise occurred in the valve by reducing the number of construction parts.
2. Description of the Prior Art
Generally, compressors can be divided into various kinds in accordance with compression methods, among them an air conditioning system required to be small-sized and lightweight mainly uses a scroll compressor.
FIG. 1
is a sectional view illustrating a scroll compressor in accordance with the prior art.
The scroll compressor in accordance with the prior art includes a casing
106
respectively connected to a suction pipe
102
at which a fluid is sucked, a discharge pipe
104
at which a compressed fluid is discharged and having a hermetically sealed certain space, a driving unit
108
placed at the lower portion of the casing
106
and generating a driving force, and a compressing unit
110
placed at the upper portion of the casing
106
, connected to the driving unit
108
by a rotational shaft
112
, compressing the fluid sucked through the suction pipe
102
and discharging it through the discharge pipe
104
by the rotation of the rotational shaft
112
.
A supporting frame
114
is installed inside the casing in order to support the rotational shaft
112
rotatively and support the compressing unit
110
, and a separation panel
120
is installed inside the casing
106
in order to divide the inner space of the casing
106
into a first chamber
116
putting a low pressure on a fluid and a second chamber
118
putting a high pressure on the fluid.
Because the driving unit
108
is constructed with a stator
122
fixed to the casing
106
and a rotor
124
installed to the inner circumference of the stator
122
and fixed to the rotational shaft
112
, when power is applied to the stator
122
, the rotor
124
is rotated by the mutual operation of the stator
122
and the rotor
124
, accordingly the rotational shaft
112
is rotated.
The compressing unit
110
includes a fixed scroll
128
formed with a fixed vane
126
having an involute shape and fixed to the separation panel
120
, and an orbiting scroll
132
formed as an orbiting vane
130
having an involute shape corresponding to vane
126
so as to have a certain compression space between the fixed vane
126
of the fixed scroll
128
, supported by the supporting panel
114
so as to perform an orbiting motion and orbiting in the rotation of the rotational shaft
112
.
A discharge passage
136
is formed at the center of the fixed scroll
128
in order to discharge the fluid compressed by the mutual operation of the fixed scroll
128
and the orbiting scroll
132
into the second chamber
118
, a check valve
138
is installed to the upper portion of the discharge passage
136
in order to prevent the fluid discharged into the second chamber
118
from flowing backward into the first chamber
116
, and a vacuum preventive valve
140
is installed to the side of the fixed scroll
128
in order to prevent the first chamber
116
from being in a vacuum state by flowing the fluid of the second chamber
118
to the first chamber
116
when the driving unit
108
is stopped or the suction pipe
102
is closed.
The check valve
138
is constructed with a valve body
142
combined to the central upper end portion of the fixed scroll
128
at which the discharge passage
136
is formed by a bolt and having a penetrated central portion so as to connect to the discharge passage
136
, and a piston type valve member
144
installed inside the valve body
142
so as to be movable up and down in order to close the discharge passage
136
by a self weight.
In the check valve
138
, when the fluid compressed by the mutual operation of the fixed scroll
128
and the orbiting scroll
132
is discharged into the discharge passage
136
, the valve member
144
is lifted by a pressure of the discharged fluid. Herein, the compressed fluid flows into the second chamber
118
while the discharge passage
136
is opened and is discharged outside through the discharge pipe
104
.
As depicted in
FIG. 2
, the vacuum preventive valve
140
includes a cylinder unit
150
formed at the side of the fixed scroll
128
so as to have a certain space, a valve spool
152
installed to the inner circumference of the cylinder unit
150
so as to be slidable, and an elastic member
158
engaged between the side surface of the valve spool
152
and the internal wall of the cylinder unit
150
and providing a certain elastic force to the valve spool
152
.
Herein, the side of the cylinder portion
150
is opened so as to connect with the first chamber
118
. And, the fluid compressed at the compression space between the fixed vane
126
and the orbiting vane
130
flows into the cylinder unit
150
through a first flow channel
154
, and because the cylinder unit
150
is connected to the second chamber
118
by a second flow channel
156
, the fluid inside the second chamber
118
flows into the cylinder unit
150
.
A spring constant of an elastic member
158
is smaller than a pressure of the fluid flowing into the first flow channel
154
.
In the vibration preventive valve
140
, when the fluid compressed in the compression space puts to the side of the cylinder unit
150
through the first flow channel
154
and operates on the valve spool
152
, the valve spool
152
is moved in the right direction in
FIG. 2
by overcoming the elastic force of the elastic member
158
, accordingly the closed state of the second flow channel
156
can be maintained.
In the closed state, when the operation of the orbiting scroll
132
is stopped due to the stopping of the driving unit
108
, as depicted in
FIG. 3
, a hydraulic pressure acting on the valve spool
152
through the first flow channel
154
is removed, the valve spool
152
is moved in the left direction in
FIG. 3
by the elastic force of the elastic member
158
. Herein, because the second flow channel
156
and the first chamber
116
are connected by the movement of the valve spring
152
, the high pressure fluid inside the second chamber
118
flows into the first chamber
116
, accordingly the first chamber
116
and the second chamber
118
can keep a balance pressure.
And, when the driving unit
108
is operated in the closed state of the suction pipe
102
, the hydraulic pressure acting on the valve spool
152
through the first flow channel
154
is removed, the valve spool
152
is moved in the left direction in
FIG. 2
, then, the second flow channel
156
and the second chamber
118
are connected each other, the fluid inside the second chamber
118
is supplied to the first chamber
116
, accordingly it is possible to prevent the first chamber from being in a vacuum state.
However, in the conventional scroll compressor, because a check valve preventing a backward flow of a fluid and a vacuum preventive valve preventing a first chamber from being in a vacuum state are respectively installed to a fixed scroll, the structure is complicate, and because the two valves are respectively installed to the fixed scroll, a space for housing the valves has to be increased, accordingly the size of a whole compressor is increased.
In addition, because the structure of the compressor is complicate due to the vibration preventive valve and the check valve, production processes are intricate, accordingly a production cost is increased.
In addition, because a valve member of the check valve is formed as a piston type, the valve member is moved up and down inside the valve body in accordance with a pressure of a fluid, when a discharge pressure is unstable, the valve member generates a noise by being collided with the internal wall of the valve body or the upper surface of the fixed scroll.
SUMMARY OF THE INVENTION
In order to solve the above-mentioned problems, it is an object of the present invention to provide a scroll compressor which is capa
LG Electronics Inc.
Liu Han L
Ostrolenk Faber Gerb & Soffen, LLP
Tyler Cheryl J.
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