Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
1999-12-06
2001-07-10
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C418S057000
Reexamination Certificate
active
06257852
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a balancing structure of axial submission device for a scroll compressor and, more particularly, to a sealing structure that is installed on an isolating block for isolating high pressure from low pressure, and presses and holds a stationary scroll more steadily.
BACKGROUND OF THE INVENTION
As shown in
FIG. 7
, a scroll compressor in prior art comprises a stationary scroll
11
, an orbiting scroll
10
, and an isolating member
12
. The inner side of the stationary scroll
11
has a predetermined number of spiral scroll plates. The stationary scroll
11
has a through discharge port
111
at the center thereof. The orbiting scroll
10
has a predetermined number of projecting spiral scroll plates to be assembled with the stationary scroll
11
. The scroll plates form a plurality of compression rooms between the two scrolls. The orbiting scroll
10
is driven (by an eccentric shaft connected to a motor) to orbit the stationary scroll
11
but not to rotate on its axis such that working fluid is led into the compression rooms, compressed from low pressure through middle pressure to high pressure, and discharged at high-pressure state via the discharge port
111
of the stationary scroll
11
. The isolating member
12
is fixed in a shell
1
of the scroll compressor and partitions the shell
1
into a high-pressure chamber
2
and a low-pressure chamber
3
. A through hole
122
is disposed at the center of the isolating member
12
to connect the two chambers
2
and
3
. A predetermined number of back pressure rooms
123
near the low-pressure chamber
3
are installed at positions at the same distance from the axis of the through hole
122
. The stationary scroll
11
is located in the low-pressure chamber
3
. The projecting edge of the discharge port
111
at the back of the stationary scroll
11
forms a tubular neck
112
. The neck
112
is lagged in the through hole
122
of the isolating member
12
and can make a little motion along the axis of the through hole
112
. A sealing ring
125
of back pressure mechanism and a resilient member
126
are installed in the neck
112
. The sealing ring
125
presses on the resilient member
126
to build back pressure. An anti-leakage member
124
is installed between the outer surface of the sealing ring
125
and the inner surface of the neck
112
to prevent high-pressure working fluid of the discharge port
111
from leaking into the low-pressure chamber
3
. A predetermined number of pressing members
13
are respectively accommodated in each back pressure room
123
to be lapped on the back
113
of the stationary scroll
11
. An anti-leakage member
114
is installed between each pressing member
13
and each back pressure room
123
. When the stationary scroll
11
and the orbiting scroll
10
are engaged, compressed working fluid generated therein is led into the back pressure rooms
123
to drive each pressing member to stick to the back
113
of the stationary scroll
11
such that the stationary scroll
11
sticks tightly to the orbiting scroll
10
. Therefore, when the orbiting scroll orbits the stationary scroll
11
, the two scrolls are tightly joined in the axial direction to prevent compressed working fluid in each compression room from leaking out.
As shown in
FIGS. 6
a
and
6
b
, the pressing member
13
is a bolt of cylindrical shape
13
b
or of cylindrical cup shape
13
a
. In the prior art, to maintain compression stability and balance of the isolating member
12
, th pressing member
13
must be evenly arranged at least every 120 degrees. Three back pressure rooms require three pressing members (also called axial submission bolts) and three corresponding anti-leakage members. If there are more back pressure rooms, more pressing members and anti-leakage members are needed such that the assembly process becomes more complex and the products cost thereof becomes higher. As shown in
FIG. 9
, a pressing member of annular groove shape
14
a
or annular shape
146
(both shown in
FIGS. 8
a
and
8
b
) have been proposed in the prior art for use with a corresponding back pressure room of annular shape. However, an annular projecting edge
115
must be installed on the back of the stationary scroll
11
to stick to each pressing member
13
or
14
a
,
14
b
. Process complexity and production cost are thus increased. As shown in
FIG. 10
, a guide hole
116
of the tubular neck
112
of the stationary scroll
11
and a connection hole
121
disposed in the isolating member
12
have been proposed such that the compression room and the back pressure room
123
are connected. However, process complexity is increased. Also, inequality of pressure in the compression room may result in imbalance of the pressing member such that noise easily arises, abrasion of components increases, and thus lifetime is reduced.
SUMMARY AND OBJECTS OF THE PRESENT INVENTION
The primary object of the present invention is to provide a balancing structure of axial submission device for a scroll compressor such that balanced pressing and supporting of the isolating block to the stationary scroll can be achieved via simple process. Thereby process complexity, number of components, and production cost are all reduced while high accuracy of pressing and supporting function can be maintained.
The present invention is characterized in that narrower cross section forms on the isolating block partitioning high pressure from low pressure in a scroll compressor such that the direction toward the stationary scroll of low pressure side has larger direct back pressure. Or at least a balance room is installed on the isolating block toward the back of the stationary scroll, a first resilient member is placed in the balance room, and the resilient member is lapped on the back of the stationary scroll. Furthermore, at least an anti-pressure room can be installed on the orbiting scroll, and a second resilient member is placed in the anti-pressure room to provide slightly larger pressure for the second resilient member than pressure of the first resilient member when the orbiting scroll starts to rotate.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawings, in which:
REFERENCES:
patent: 5192202 (1993-03-01), Lee
patent: 5435707 (1995-07-01), Hirano et al.
patent: 5447418 (1995-09-01), Takeda et al.
patent: 5474433 (1995-12-01), Chang et al.
patent: 5487653 (1996-01-01), Lee
patent: 5494422 (1996-02-01), Ukai et al.
patent: 6056523 (2000-05-01), Won et al.
patent: 5-149266 (1993-06-01), None
patent: 6-026470 (1994-01-01), None
patent: 6-173864 (1994-06-01), None
Chang Lung-Tsai
Tarng Guang-Der
Denion Thomas
Rechi Precision Co., Ltd.
Rosenberg , Klein & Lee
Trieu Theresa
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