Compressor

Details Compressor Compressor

2002-06-26

2004-06-08

Yu, Justine R. (Department: 3746)

Pumps

Motor driven

Including means utilizing pump fluid for augmenting cooling,...

C417S902000, C418S055600

Reexamination Certificate

active

06746215

ABSTRACT:

DETAILED EXPLANATION OF THE INVENTION
1. Technical Field of the Invention
The present invention relates to a refrigerant compressor which has a compression mechanism part and an electric motor part in a hermetic container.
2. Description of the Related Art
FIG. 8
shows a longitudinal sectional view of a conventional scroll compressor disclosed in Japanese Unexamined Patent Publication No. 2000-161254. In
FIG. 8
, a fixed scroll
1
and a guide frame
15
are shown. The peripheral part of the fixed scroll
1
is fixed to the guide frame
15
by bolts (not shown). From the side of the fixed scroll
1
, a suction tube
10
a
is pressed penetrating a hermetic container
10
.
A spiral blade
2
b
is provided on a seat
2
a
of an orbiting scroll
2
. The form of the spiral blade
2
b
is substantially the same as a spiral blade
1
b
provided on a seat
1
a
of the fixed scroll
1
. The spiral blade
1
b
and the spiral blade
2
b
geometrically form a compression chamber
1
d
. A boss part
2
f
being a hollow cylinder is provided at the central part of the surface of the seat
2
a
opposite to the surface where the spiral blade
2
b
exists. The boss part
2
f
is rotatably engaged with an orbiting shaft part
4
b
provided at the upper end of a main shaft
4
. A thrust surface
2
d
is formed on the surface of the seat
2
a
opposite to the surface where the spiral blade
2
b
exists. The thrust surface
2
d
is slidably in contact with a thrust bearing
3
a
of a compliant frame
3
.
The compliant frame
3
is supported in the radial direction at an upper surface
3
d
and a lower surface
3
e
provided on the external circumferential part of the compliant frame
3
, by an upper surface
15
a
and a lower surface
15
b
provided on the internal circumferential part of the guide frame
15
. A main bearing
3
c
and a sub-main bearing
3
h
at the center of the compliant frame
3
support the main shaft
4
rotated by a stator
7
, in the radial direction. A connection passage
3
s
penetrating along the axial direction from the inside of the thrust bearing
3
a
is also provided. A thrust bearing side opening
2
k
is provided facing an orbiting scroll extraction hole
2
j.
Although an external circumferential surface
15
g
of the guide frame
15
is adhered to the hermetic container
10
by means of shrinkage fitting or welding, a passage is secured which leads refrigerant gas of high pressure discharged from a discharge port
1
f
of the fixed scroll
1
to a discharge tube
10
b
provided between the compression mechanism part and the electric motor element. This passage is formed by a concave part
15
c
provided at the outer peripheral part of the guide frame
15
.
The orbiting shaft
4
b
at the upper end of the main shaft
4
is rotatably engaged with an orbiting bearing
2
c
of the orbiting scroll
2
, and a main shaft balancer
4
e
is provided below the orbiting shaft
4
b
by shrinkage fitting. Furthermore, a main shaft part
4
c
which contacts the main bearing
3
c
and the sub-main bearing
3
h
of the compliant frame
3
during rotation is provided below the main shaft balancer
4
e
. Below the main shaft
4
, a sub-shaft part
4
d
which is rotatably engaged with a sub-bearing
6
a
of a sub-frame
6
is formed. A rotor
8
is provided by shrinkage fitting between the sub-shaft part
4
d
and the main shaft part
4
c
. A first balancer
8
a
is fixed to the upper end surface of the rotor
8
and a second balancer
8
b
is fixed to the lower end surface of the rotor
8
. Static balance and dynamic balance are retained by the three balancers: the first balancer
8
a
, the second balancer
8
b
, and the main shaft balancer
4
e
. An oil pipe
4
f
pressed in the lower end of the main shaft
4
sucks up refrigerating machine oil
10
e
collected in an oil reservoir
10
g
at the bottom of the hermetic container
10
.
Now, the basic operation of this conventional scroll compressor will be explained. Sucked low-pressure refrigerant is led from the suction tube
10
a
into the compression chamber
1
d
formed by the spiral blades of the fixed scroll
1
and the orbiting scroll
2
. The orbiting scroll
2
driven by the stator
7
decreases the capacity of the compression chamber
1
d
by an eccentric revolution movement. The sucked refrigerant becomes high pressure by this compression process, and is discharged into the hermetic container
10
from the discharge port
1
f
of the fixed scroll
1
.
The refrigerating machine oil
10
e
collected in the oil reservoir
10
g
at the bottom of the hermetic container
10
is led by a difference of pressure to an orbiting bearing part
2
g
through a hollow space
4
g
penetrating, along the axial direction, the main shaft
4
. The refrigerating machine oil which has become intermediate pressure by a throttle action of the orbiting bearing part
2
g
fills a space
2
h
(boss part space) surrounded by the orbiting scroll
2
and the compliant frame
3
. Then, the refrigerating machine oil which has become intermediate pressure is led to a low pressure space via a pressure adjustment valve (not shown) connecting the space
2
h
and a low-pressure atmosphere space, and sucked into the compression chamber
1
d
with the refrigerant gas of low-pressure. By dint of this compression process, the refrigerating machine oil is discharged into the hermetic container
10
from the discharge port
1
f
with high-pressure refrigerant gas.
In the conventional scroll compressor of high-pressure shell type explained above, the refrigerant gas and the refrigerating machine oil are discharged in the state of being mixed as shown in FIG.
9
.
FIG. 9
illustrates flows of the refrigerant gas and the refrigerant according to the conventional compressor. In
FIG. 9
, the discharge port
1
f
, the concave part
15
c
provided at the outer peripheral part of the guide frame
15
, and the discharge tube
10
b
are shown. The white arrow in
FIG. 9
indicates a flow of the refrigerant gas, and the black arrow indicates a flow of the refrigerating machine oil.
The refrigerant gas and the refrigerating machine oil discharged from the discharge port
1
f
go through the concave part
15
c
in the state of mixed, go between the guide frame
15
and the electric motor element, and are finally discharged from the discharge tube
10
b
to the outside of the compressor. However, when they are discharged, rather much refrigerating machine oil is carried out of the compressor with the refrigerant gas. Therefore, there is a problem that pressure loss and deterioration of heat-conducting performance are performed in the unit and seizure of bearings in the compressor occurs because of oil lack, which decreases the reliability of the compressor.
SUMMARY OF THE INVENTION
One of objects of the present invention is to solve the above-mentioned problem in order to obtain a compressor of high reliability. It is another object to obtain a compressor in which the refrigerant gas and the refrigerating machine oil can be separated. Moreover, the present invention aims at obtaining a compressor in which the separated refrigerating machine oil can be returned to the oil reservoir and the mount of refrigerating machine oil carried outside of the compressor can be suppressed.
According to one aspect of the compressor of the present invention, the compressor includes:
a compression mechanism part, included in a hermetic container, for compressing refrigerant sucked from the outside of the hermetic container and discharging compressed refrigerant to a discharge space in the hermetic container;
an electric motor part composed of a stator and a rotor, facing a first space which is at the opposite side, along the axial direction, of the discharge space with respect to the compression mechanism part in the hermetic container, for driving the compression mechanism part through a main shaft;
a discharge tube provided in the hermetic container, being open to the first space;
a passage at the external circumferential side of the compression mechanism part, for connecting the dischar

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