Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
2002-09-04
2004-01-20
Vrablik, John J. (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C418S055400, C418S149000
Reexamination Certificate
active
06679690
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to a scroll compressor for use in a refrigerator, an air conditioner, or the like.
BACKGROUND OF THE INVENTION
One of conventional scroll compressors known in the art is, for example, disclosed in JP-A-2000-161254 and its construction will be described with reference to FIG.
6
.
A fixed scroll member
12
and an oscillating scroll member
14
are disposed in a closed vessel
10
. The fixed scroll member
12
and the oscillating scroll member
14
have plate-like scroll teeth
16
and
18
having substantially the same shape, respectively. The plate-like scroll teeth
16
and
18
are in gear with each other so as to form a compression chamber
20
which changes in volume relatively between the plate-like scroll teeth
16
and
18
.
The fixed scroll member
12
is fixed to a guide frame
22
by a plurality of bolts which are not shown. The guide frame
22
is fixedly attached to the inner wall of the closed vessel
10
by such means as shrink-fitting or welding. The oscillating scroll member
14
and a compliant frame
24
are received in an internal space formed by the fixed scroll member
12
and the guide frame
22
. The compliant frame
24
is located under the oscillating scroll member
14
so as to support the oscillating scroll member
14
in the axial direction of the scroll compressor.
At substantially the center portion of a base plate portion
15
of the oscillating scroll member
14
, a hollow cylindrical boss portion
26
is formed to extend into the inside of the compliant frame
24
. A crank shaft
29
in the upper end portion of a main shaft
28
is rotatably connected to the boss portion
26
through a bearing
27
.
The main shaft
28
is driven to rotate by a motor
30
. The motor
30
is constituted by a rotor
31
fixed to the main shaft
28
, and a stator
32
fixed to the inner wall of the closed vessel
10
. The main shaft
28
extends downward so as to be rotatably supported by the compliant frame
24
through first and second bearings
34
and
36
disposed at the upper portion, and by a sub-frame
35
through a third bearing
38
disposed at the lower portion. Further, a main shaft balancer
41
is fixedly attached to the main shaft
28
at the lower side of the crank shaft
29
by shrink-fitting, etc, and an upper balancer
42
and a lower balancer
43
are fixed to the main shaft
28
on the upper and lower surfaces of the rotor
31
respectively. Static balance and dynamic balance of the main shaft
28
are ensured by the three balancers
41
,
42
and
43
. Incidentally, in
FIG. 6
, the reference numeral
44
represents glass-sealed terminals for motor power supply purposes.
In addition, an Oldham's ring
45
is mounted on the compliant frame
24
so as to prevent the oscillating scroll member
14
from rotating on its own axis. The Oldham's ring
45
has two pairs of claws
46
and
47
, and the claws
46
and
47
in each pair have a phase difference of 90 degrees from each other (in
FIG. 1
, the claws
46
and
47
are shown to have a phase difference of 180 degrees in order to facilitate understanding). The claws
46
are engaged with two Oldham's guide grooves
48
so that the claws
46
can slide in the grooves
48
reciprocatingly, respectively. The Oldham's guide grooves
48
are formed substantially in a straight line on a base plate portion
13
of the fixed scroll member
12
. The claws
47
are engaged with two Oldham's guide grooves
49
so that the claws
47
can slide in the grooves
49
reciprocatingly, respectively. The Oldham's guide grooves
49
are formed substantially in a straight line on the base plate portion
15
of the oscillating scroll member
14
and the Oldham's guide grooves
49
have a phase difference of 90 degrees with respect to the Oldham's guide grooves
48
, respectively. Thus, the oscillating scroll member
14
driven by the rotation of the crank shaft
29
of the main shaft
28
makes an eccentric turning motion without rotating on its own axis.
The compliant frame
24
has at least two cylindrical surfaces
23
and
25
in its upper and lower outer circumferential portions, respectively. The cylindrical surfaces
23
and
25
engage with cylindrical surfaces
33
and
35
formed in the guide frame
22
so as to be supported in the radial direction of the scroll compressor, respectively. The compliant frame
24
and the guide frame
22
are fitted over each other through upper and lower sealing materials
37
and
39
. Thus, a frame space
50
formed between the two members
24
and
22
is sealed off by the sealing materials
37
and
39
.
The frame space
50
communicates with a communication passageway
51
provided in the compliant frame
24
. The upper end portion of the communication passageway
51
is somewhat expanded in diameter so as to form an opening portion
52
. The opening portion
52
is opened to the upper end surface of the compliant frame
24
. The upper end surface of the compliant frame
24
serves as a thrust bearing
56
. The oscillating scroll member
14
is supported through the thrust bearing
56
slidably in pressure contact with a thrust surface
58
. The thrust surface
58
is formed on the lower surface of the base plate portion
15
of the oscillating scroll member
14
.
An extraction hole
53
is provided in the base plate portion
15
of the oscillating scroll member
14
. A lower end opening portion
54
of the extraction hole
53
is opened to the thrust surface
58
while its upper end opening portion
55
is opened to the compression chamber
20
. Further, the thrust-surface-side opening portion
54
of the extraction hole
53
is located so that the circular locus of the opening portion stays in the opening portion
52
of the communication passageway
51
opened to the thrust bearing
56
surface of the compliant frame
24
during the normal operation. Thus, there is no leak to a suction pressure atmosphere space
17
because of the oscillating scroll member
14
and the compliant frame
24
sliding in close contact with each other.
The suction pressure atmosphere space
17
is provided in the outer circumferential portion of the base plate portion
13
of the fixed scroll member
12
. A suction pipe
19
for refrigerant gas is press fit into the space
17
through the closed vessel
10
. In addition, a discharge port
21
for compressed refrigerant gas is provided in the base plate portion
13
. The discharge port
21
communicates with a high pressure chamber
40
formed between the fixed scroll member
12
and the closed vessel
10
. The discharge port
21
further communicates with a similar high pressure chamber
62
under the guide frame
22
through a passageway
60
. The passageway
60
is composed of a notch groove provided in the outer circumferential portions of the fixed scroll member
12
and the guide frame
22
. A discharge pipe
64
is attached to the closed vessel
10
so as to communicate with the high pressure chamber
62
.
Lubricating oil
70
such as refrigerating machine oil is stored in the bottom portion of the closed vessel
10
. An oil pipe
72
connected with the lower end portion of the main shaft
28
is inserted into the lubricating oil
70
. The lubricating oil
70
sucked up through the oil pipe
72
passes through an oil passageway hole
74
extending through the main shaft
28
in its axial direction. Thus, the lubricating oil
70
is directed to the bearing portion
27
of the crank shaft
29
through an opening portion
76
at the upper end of the oil passageway hole. Further, the lubricating oil
70
lubricating the bearing portion
27
fills a space (boss portion space)
78
surrounded by the oscillating scroll member
14
and the compliant frame
24
.
FIG. 7
is a partially sectional view showing a pressure regulating mechanism provided in the compliant frame
24
.
As shown in
FIG. 7
, an intermediate pressure regulating valve
80
is incorporated in the compliant frame
24
. The intermediate pressure regulating valve
80
use
Fushiki Takeshi
Ikeda Kiyoharu
Nishiki Teruhiko
Ogawa Yoshihide
Sano Fumiaki
Mitsubishi Denki & Kabushiki Kaisha
Vrablik John J.
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