Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
1999-11-02
2001-02-27
Vrablik, John J. (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C418S094000
Reexamination Certificate
active
06193489
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a shaft assembly mechanism for a scroll compressor and, more particularly, to a shaft assembly mechanism which can reduce noise, let assembly process be more flexible, and let accuracy be easily controlled.
BACKGROUND OF THE INVENTION
In a scroll compressor, a stationary scroll and an orbiting scroll are meshed to form a plurality of closed spaces. The volume of the formed closed space decreases gradually from the outer edge toward the central part. As shown in
FIGS. 1 and 2
, an orbiting scroll
10
is led to orbit a stationary scroll
11
such that low-pressure working fluid a is sucked in via a suction port b, compressed through continuous orbital motion of the orbiting scroll
10
, and discharged at high-pressure state via a discharge port c at the center of the stationary scroll
11
. The compression stroke of working fluid is thus completed.
As shown in
FIG. 3
, a scroll compressor in prior art comprises an orbiting scroll
10
, a stationary scroll
11
, an isolating block
12
, an Oldham ring
13
, a frame
14
, an eccentric shaft
15
, a motor rotor
16
, and a motor stator
17
. The eccentric shaft
15
is tightly matched with the motor rotor
16
. An axially passive ring
18
is installed at the top end of the eccentric shaft
15
. When the motor is turned on, the eccentric shaft
15
is led to rotate by the motor rotor
16
, and the orbiting scroll
10
is led to orbit eccentrically the center of the motor rotor
16
by the ring
18
at the top of the eccentric shaft
15
. The Oldham ring
13
is installed at the top of the frame
14
. When the orbiting scroll
10
is driven, the Oldham
13
can be used to control the orbiting scroll such that it can orbit but can not rotate on its axis. The orbiting scroll
10
is pressed by the stationary scroll
11
to stick to the frame
14
. The stationary scroll
11
is fixed on the frame
14
via a passive blocking plate
19
. The passive blocking plate
19
allows the stationary scroll
11
to make a little axial motion. The orbiting scroll
10
and the stationary scroll
11
respectively have a plurality of spiral scroll plates
20
and
21
with a plurality of compression rooms formed between them. The isolating block
12
is fixed in a shell
22
of the scroll compressor and partitions the shell
22
into a high-pressure chamber and a low-pressure chamber. A through hole
24
is disposed at the center of the isolating block
12
to connect the two chambers. When low-pressure working fluid is sucked into the compression rooms via a suction port b, the working fluid is pressed to be discharged via a through discharge port c at the center of the stationary scroll
11
through the continuous orbital motion of the orbiting scroll
10
. High-pressure working fluid is then discharged out of the scroll compressor via an exit
23
at the shell
22
of the scroll compressor. However, in the above mentioned scroll compressor of prior art, another axially passive ring
18
needs to be lagged connectedly to the eccentric shaft
15
. Gap between the ring and the eccentric shaft will be large because of the axially passive function, resulting in louder noise.
Another scroll compressor of prior art has no axially passive rings. But the eccentric shaft (not shown) is integrally formed such that consumed material is more. Molding and forging methods are needed for manufacture such that production cost is higher. Moreover, the eccentric shaft must be assembled in advance with the frame. Flexibility of assembly process is thus small.
SUMMARY AND OBJECTS OF THE PRESENT INVENTION
Accordingly, the primary object of the present invention is to provide a shaft assembly mechanism for a scroll compressor. A ring is lagged connectedly to an eccentric potion at the top end of an eccentric shaft of the scroll compressor. A through hole arranged homocentrically is installed in the ring. The ring is lagged connectedly to the eccentric potion of the eccentric shaft via the through hole. A fixing hole is disposed at the bottom end of the orbiting scroll. A bushing is fixed in the fixing hole. A through hole is disposed in the bushing. A spiral oil groove is installed on the inner wall of the through hole of the bushing for addition of lubricating oil. The through hole of the bushing is lagged connectedly to the outer side of the ring. The ring of the present invention is a homocentric circle such that accuracy can be easily controlled. Moreover, a spiral oil groove is installed in the bushing for addition of lubricating oil to solve the lubrication problem between the bushing and the corresponding ring. Axially passive function is nullified in the present invention, but the assembly gap between the ring and the eccentric shaft becomes smaller such that noise is reduced. Also, the eccentric shaft needs not be assembled in advance with the frame, resulting in larger flexibility of assembly process.
REFERENCES:
patent: 4473343 (1984-09-01), Hazaki et al.
patent: 4545747 (1985-10-01), Tamura et al.
patent: 5358392 (1994-10-01), Ukai
patent: 5660539 (1997-08-01), Matsunaga et al.
patent: 5727935 (1998-03-01), Shigeoka et al.
Chang Lung-Tsai
Tarng Guang-Der
Rechi Precision Co., Ltd.
Rosenberg , Klein & Lee
Vrablik John J.
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