Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
1998-12-10
2001-07-17
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C464S102000
Reexamination Certificate
active
06261072
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a scroll compressor to be used in an air conditioner, etc., more specifically, a scroll compressor having an Oldham's ring to demonstrate the gas compression function by suppressing the rotation of an orbiting scroll, and performing the smooth turning motion relative to a fixed scroll.
2. Description of the Related Art
In a scroll compressor with the characteristics of low vibration and low noise to be used in an air conditioner for home use, etc., as indicated in
FIG. 1
of Japanese Unexamined Patent Publication No. 64-32092 Official Gazette, an orbiting scroll comprising a disk-shaped end plate and a spiral wrap which is integratedly formed on the end plate in an upright manner is engaged with a fixed scroll with similar constitution to that of the orbiting scroll and having a discharge port at the center of the end plate so that side walls of the wraps are brought into contact with each other, both scrolls are stored in a cylindrical sealed container having a suction port, the fixed scroll is fixed to the sealed container, the rotation of the orbiting scroll is prevented by a rotation preventive device, a crank shaft having an eccentric part fitted to the orbiting scroll is turned by driving a motor to drive the orbiting scroll so that the center of the spiral of the wrap of the orbiting scroll is turned around the center of the spiral of the wrap of the fixed scroll while the wraps of both scrolls are kept in a contact condition.
FIG. 4
schematically shows a compression mechanism part of a well-known scroll compressor, and its structure is described in detail.
Referring to
FIG. 4
, the scroll compressor has a compression mechanism part
20
, an orbiting scroll
21
, a boss part
21
a
, a bearing
21
b
, a wrap
21
c
, a key groove
21
d
, a fixed scroll
22
, a wrap
22
a
, a flange part
22
b
, a frame
23
, a main bearing part
23
a
, a key groove
23
b
, a flange part
23
c
, a screw hole
23
d
, a bolt
24
, a crank shaft
25
, an eccentric part
25
a
, an Oldham's ring
26
, an Oldham's key
26
a
, an annular part
26
b
of the Oldham's ring, a motor
27
, a rotor
27
a
, a stator
27
b
, and a sealed container
28
.
That is,
FIG. 4
is an elevational sectional view of a well-known typical scroll compressor, and in the compression mechanism part
20
, the stator
27
a
of the motor
27
is fitted through press-fitting, etc., to a lower end side of the crank shaft
25
inserted in the main bearing part
23
a
of the frame
23
as mentioned above, the bearing
21
b
provided on the boss part
21
a
of the orbiting scroll
21
is fitted to the eccentric part
25
a
of the crank shaft
25
, the fixed scroll
22
whose wrap
22
a
is brought into contact and engaged with the wrap
21
c
of the orbiting scroll
21
is arranged as illustrated in the figure, and further, as shown in
FIG. 5
, the projected Oldham's key
26
a
which is orthogonally arranged in an integrated manner with upper and lower surfaces of the annular part
26
b
having an arbitrary thickness which is the rotation preventive mechanism of the orbiting scroll
21
is engaged with the key groove
21
d
of the orbiting scroll
21
and the key groove
23
b
of the frame
23
respectively to prevent the rotation of the orbiting scroll
21
, a plurality of bolts
24
are inserted in through holes
22
c
provided in the flange part
22
b
of the fixed scroll
22
, and screwed in the screw holes
23
d
provided in the flange part
23
c
of the frame
23
, and the wraps
21
c
,
22
a
are regulated in alignment and tightened to complete the assembly of the compression mechanism part
20
.
The stator
27
b
of the motor
27
is welded at an arbitrary position of a lower part of the sealed container
28
, and the frame
23
of the sealed container
28
and the compression mechanism part
20
is locked through a plurality of spot welding between the inside diameter of the stator
27
b
and the outside diameter of the rotor
27
a
which is pre-welded to the crank shaft
25
of the compression mechanism part
20
while keeping an appropriate air gap.
In such a scroll compressor, the quantity of unbalance caused by the rotation for the orbiting scroll
21
, the crank shaft
25
and the rotor
27
a
of the motor
27
can be eliminated by reducing the weight thereof through appropriate spot facing, or by adding a balance weight thereto.
However, only the Oldham's ring
26
, in which its Oldham's key
26
a
is inserted in the key grooves
21
d
,
23
b
of the orbiting scroll
21
and the frame
23
respectively to prevent the rotation of the orbiting scroll
21
, and the rotational motion of the eccentric part
25
a
of the crank shaft
25
is converted into the oscillating motion of the orbiting scroll
21
in order to prevent the rotation of the orbiting scroll
21
, is reciprocated to generate the vibration attributable to its weight. In particular, the noise caused by the resonance, etc., of each part raises a problem in a room air conditioner for home use, etc., in which the high-speed rotation is required in the inverter control, etc.
Further, in such a well-known scroll compressor, a ferrous Oldham's ring is often used in order to improve the reliability in slidability between the Oldham's key
26
a
and the key grooves
21
d
,
23
b
, and the vibration is increased as the weight is increased compared with the Oldham's ring consisting of the light metal such as aluminum, with the result against the low-vibration and low-noise properties which are the original object for the scroll compressor.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a scroll compressor to be used in the air conditioner, etc., in which the weight of the Oldham's ring is reduced while securing the reliability in slidability between the key groove and the key, generation of the conventionally experienced excessive vibration is eliminated, and the reliability is excellent.
The above-mentioned object of the present invention is achieved as follows.
Firstly, in the scroll compressor in which the orbiting scroll is provided between the frame and the fixed scroll, the fixed scroll is engaged with the orbiting scroll with their spiral wraps respectively on the inner side, the Oldham's ring is provided between the frame and the orbiting scroll, and the Oldham's key of the Oldham's ring is inserted in the key grooves of the frame and the orbiting scroll, the Oldham's ring is characterized in that the Oldham's key is provided with a wear resistant bush. The sliding wear of the Oldham's key is suppressed, and its reliability in slidability is improved thereby. Thus, the weight of the Oldham's ring itself can be reduced.
Secondly, the Oldham's ring is characterized in that its annular part and a projected part of the Oldham's key are integratedly formed of the light metal such as aluminum alloy, and the bush is locked to a sliding part between the projected part and the key groove. Thus, generation of the vibration attributable to the weight is prevented more compared with a conventional scroll compressor completely formed of steel, through the weight reduction of the Oldham's ring.
Thirdly, the Oldham's key is characterized in that the outside diameter of the projected part and the inside diameter of the bush are locked through press-fitting. Thus, the bush can be easily fitted.
Fourthly, the Oldham's key is characterized in that the outside diameter of the projected part is fitted to the inside diameter of the bush with an arbitrary clearance therebetween, and the Oldham's ring is locked to the bush by pressing the projected part to achieve the plastic flow into a recessed part provided in the side wall inside diameter of the bush. Thus, the bush can surely be fixed to the projected part, and the reliability is improved.
Fifthly, the Oldham's key is characterized in that a sliding surface side with the key groove
Abe Nobuo
Sekiguchi Koichi
Antonelli Terry Stout & Kraus LLP
Denion Thomas
Hitachi Ltd
Trieu Theresa
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