U.S. patent application number 16/321661 was filed with the patent office on 2020-12-03 for co-rotating scroll compressor.
This patent application is currently assigned to MITSUBISHI HEAVY INDUSTRIES, LTD.. The applicant listed for this patent is MITSUBISHI HEAVY INDUSTRIES, LTD.. Invention is credited to Hirofumi HIRATA, Takahide ITO, Keita KITAGUCHI, Makoto TAKEUCHI, Takuma YAMASHITA.
Application Number | 20200378383 16/321661 |
Document ID | / |
Family ID | 1000005036628 |
Filed Date | 2020-12-03 |
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United States Patent
Application |
20200378383 |
Kind Code |
A1 |
YAMASHITA; Takuma ; et
al. |
December 3, 2020 |
CO-ROTATING SCROLL COMPRESSOR
Abstract
A co-rotating scroll compressor includes a driving-side scroll
member, a driven-side scroll member, and a housing that
accommodates both of the scroll members. The housing includes
partition surfaces partitioned at a plane including both of the
scroll members and approximately orthogonal to rotational axes of
the scroll members, and flange parts that fasten the partition
surfaces in a region on a periphery of the scroll members and on a
lateral side when seen from a straight line connecting the
rotational axes of the scroll members to each other.
Inventors: |
YAMASHITA; Takuma; (Tokyo,
JP) ; ITO; Takahide; (Tokyo, JP) ; TAKEUCHI;
Makoto; (Tokyo, JP) ; KITAGUCHI; Keita;
(Tokyo, JP) ; HIRATA; Hirofumi; (Aichi,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
MITSUBISHI HEAVY INDUSTRIES, LTD. |
Tokyo |
|
JP |
|
|
Assignee: |
MITSUBISHI HEAVY INDUSTRIES,
LTD.
Tokyo
JP
|
Family ID: |
1000005036628 |
Appl. No.: |
16/321661 |
Filed: |
August 1, 2017 |
PCT Filed: |
August 1, 2017 |
PCT NO: |
PCT/JP2017/027939 |
371 Date: |
January 29, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F04C 2240/603 20130101;
F04C 18/023 20130101; F04C 2240/30 20130101; F04C 2240/50 20130101;
F04C 2240/40 20130101; F04C 18/0215 20130101 |
International
Class: |
F04C 18/02 20060101
F04C018/02 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 1, 2016 |
JP |
2016-151544 |
Claims
1. A co-rotating scroll compressor, comprising: a driving-side
scroll member driven by a drive unit so as to rotate, and
comprising a plurality of spiral driving-side walls provided about
a center of a driving-side end plate at predetermined angular
intervals; a driven-side scroll member comprising spiral
driven-side walls, the driven-side walls being provided about a
center of a driven-side end plate at predetermined angular
intervals and in a number corresponding to the driving-side walls,
the driven-side walls being engaged with the corresponding
driving-side walls so as to form a compression space; a synchronous
driving mechanism that transmits driving force from the
driving-side scroll member to the driven-side scroll member so that
the driving-side scroll member and the driven-side scroll member
rotationally move in a same direction at a same angular velocity;
and a housing that accommodates the scroll members and the
synchronous driving mechanism, wherein the housing comprises:
partition surfaces partitioned at a plane comprising the scroll
members and approximately orthogonal to rotational axes of the
scroll members; and fastening portions that fasten the partition
surfaces in a region on a periphery of the scroll members and on a
lateral side when seen from a straight line connecting the
rotational axes of the scroll members to each other.
2. The co-rotating scroll compressor according to claim 1, wherein
the fastening portions are provided in a region approximately
orthogonal to the straight line connecting the rotational axes of
the scroll members to each other.
3. The co-rotating scroll compressor according to claim 1, wherein
the fastening portions are provided on an inner side with respect
to a circumscribed circle surrounding the driving-side scroll
member and the driven-side scroll member.
4. The co-rotating scroll compressor according to claim 1, further
comprising: a driving-side bearing supporting rotation of the
driving-side scroll member; and a driven-side bearing supporting
rotation of the driven-side scroll member, wherein a mounting hole
for performing mounting on an external structure is formed on an
outer peripheral side of the driving-side bearing and/or the
driven-side bearing.
Description
TECHNICAL FIELD
[0001] The present invention relates to a co-rotating scroll
compressor.
BACKGROUND ART
[0002] Hitherto, a co-rotating scroll compressor is known (see PTL
1). The co-rotating scroll compressor includes a driving-side
scroll and a driven-side scroll that rotates together with and in
synchronization with the driving-side scroll. The co-rotating
scroll compressor rotates the driving shaft and the driven shaft in
the same direction at the same angular velocity by offsetting a
driven shaft that supports the rotation of the driven-side scroll
from a driving shaft that rotates the driving-side scroll by the
turning radius.
CITATION LIST
Patent Literature
[PTL 1]
the Publication of Japanese Patent No. 5443132
SUMMARY OF INVENTION
Technical Problem
[0003] Also for the co-rotating scroll compressor as that in PTL 1,
downsizing is desired so that mounting ability and the like is
enhanced.
[0004] The present invention has been made in view of the situation
as above, and an object thereof is to provide a co-rotating scroll
compressor that can be downsized.
Solution to Problem
[0005] In order to solve the abovementioned problem, a co-rotating
scroll compressor of the present invention employs the following
solutions.
[0006] That is, a co-rotating scroll compressor according to an
aspect of the present invention includes: a driving-side scroll
member driven by a drive unit so as to rotate, and including a
plurality of spiral driving-side walls provided about a center of a
driving-side end plate at predetermined angular intervals; a
driven-side scroll member including spiral driven-side walls, the
driven-side walls being provided about a center of a driven-side
end plate at predetermined angular intervals and in a number
corresponding to the driving-side walls, the driven-side walls
being engaged with the corresponding driving-side walls so as to
form a compression space; a synchronous driving mechanism that
transmits driving force from the driving-side scroll member to the
driven-side scroll member so that the driving-side scroll member
and the driven-side scroll member rotationally move in a same
direction at a same angular velocity; and a housing that
accommodates the scroll members and the synchronous driving
mechanism, in which the housing includes: partition surfaces
partitioned at a plane including the scroll members and
approximately orthogonal to rotational axes of the scroll members;
and fastening portions that fasten the partition surfaces in a
region on a periphery of the scroll members and on a lateral side
when seen from a straight line connecting the rotational axes of
the scroll members to each other.
[0007] The driving-side walls arranged about the center of the end
plate of the driving-side scroll member at predetermined angular
intervals and the corresponding driven-side walls of the
driven-side scroll member are engaged with each other. As a result,
a plurality of pairs each formed by one driving-side wall and one
driven-side are provided, and the scroll-type compressor including
a plurality of lines of walls is formed. The driving-side scroll
member is driven by the drive unit so as to rotate, and the driving
force transmitted to the driving-side scroll member is transmitted
to the driven-side scroll member via the synchronous driving
mechanism. As a result, the driven-side scroll member rotationally
moves in the same direction at the same angular velocity as the
driving-side scroll member while rotating. As described above, the
double rotating-type scroll-type compressor in which both of the
driving-side scroll member and the driven-side scroll member rotate
is provided.
[0008] The housing that accommodates both of the scroll members and
the synchronous driving mechanism is included. The housing includes
the partition surfaces including both of the scroll members and
approximately orthogonal to the rotational axes of both of the
scroll members. The housing includes the fastening portions for
fastening the partition surfaces. Further, the fastening portions
are provided in the region on the periphery of both of the scroll
members and on the lateral side when seen from the straight line
connecting the rotational axes of both of the scroll members to
each other.
[0009] In the case of the co-rotating scroll compressor, the center
of the housing is provided between the rotation center of the
driving scroll and the rotation center of the driven scroll.
Therefore, when both of the scroll members are seen from the
rotational axis, the projected shape of both of the scroll members
becomes an elliptical shape having the major axis in the direction
in which the rotational axes are connected to each other.
Therefore, a space is formed in the region on the periphery of both
of the scroll members and on the lateral side when seen from the
straight line connecting the rotational axes of both of the scroll
members. By providing the fastening portions in the region, the
external form of the housing can be caused to be as small as
possible, and the co-rotating scroll compressor can be configured
in a compact manner.
[0010] Further, in the co-rotating scroll compressor according to
an aspect of the present invention, the fastening portions are
provided in a region approximately orthogonal to the straight line
connecting the rotational axes of the scroll members to each
other.
[0011] In the region approximately orthogonal to the straight line
connecting the rotational axes of the scroll members to each other,
the largest space can be secured. Therefore, it is preferred that
the fastening portions be provided in this region.
[0012] Further, in the co-rotating scroll compressor according to
an aspect of the present invention, the fastening portions are
provided on an inner side with respect to a circumscribed circle
surrounding the driving-side scroll member and the driven-side
scroll member.
[0013] By providing the fastening portions on the inner side with
respect to the circumscribed circle surrounding both of the scroll
members, the housing can be configured in a compact manner.
[0014] Further, the co-rotating scroll compressor according to an
aspect of the present invention further includes: a driving-side
bearing supporting rotation of the driving-side scroll member; and
a driven-side bearing supporting rotation of the driven-side scroll
member, in which a mounting hole for performing mounting on an
external structure is formed on an outer peripheral side of the
driving-side bearing and/or the driven-side bearing.
[0015] A predetermined space can be secured between the outer
peripheral side of the driving-side bearing and the driven-side
bearing and the external form of the housing. In this space,
mounting holes for performing mounting on an external structure
such as an engine, for example, are formed. As a result, the
mounting holes can be formed without upsizing the external form of
the housing, and hence the co-rotating scroll compressor can be
configured in a compact manner.
[0016] The mounting holes are typically used as holes for attaching
mounting feet for performing mounting on the external structure.
The mounting holes may be through holes or bottomed holes.
Advantageous Effects of Invention
[0017] The fastening portions are provided in the space formed in
the region on the periphery of both of the scroll members and on
the lateral side when seen from the straight line connecting the
rotational axes of both of the scroll members to each other, and
hence the external form of the housing can be caused to be as small
as possible, and the co-rotating scroll compressor can be
configured in a compact manner.
BRIEF DESCRIPTION OF DRAWINGS
[0018] FIG. 1 is a longitudinal cross-sectional view illustrating a
co-rotating scroll compressor according to a first embodiment of
the present invention.
[0019] FIG. 2 is a plan view illustrating a driving-side scroll
member in FIG. 1.
[0020] FIG. 3 is a plan view illustrating a driven-side scroll
member in FIG. 1.
[0021] FIG. 4 is a side view of both of the scroll members in FIG.
1 seen from the rotational axis side.
[0022] FIG. 5 is a longitudinal cross-sectional view illustrating a
co-rotating scroll compressor according to a second embodiment of
the present invention.
[0023] FIG. 6 is a longitudinal cross-sectional view illustrating a
modification of FIG. 5.
DESCRIPTION OF EMBODIMENTS
[0024] A first embodiment of the present invention is described
below with reference to FIG. 1 and the like.
[0025] FIG. 1 illustrates a co-rotating scroll compressor 1A. The
co-rotating scroll compressor 1A can be used as a supercharger that
compresses combustion air (fluid) to be supplied to an internal
combustion engine such as a vehicle engine, for example.
[0026] The co-rotating scroll compressor 1A includes a housing 3, a
motor (drive unit) 5 accommodated in the housing 3 on one end side
thereof, and a driving-side scroll member 70 and a driven-side
scroll member 90 accommodated in the housing 3 on another end
thereof.
[0027] The housing 3 has a substantially cylindrical shape, and
includes a motor accommodation portion 3a in which the motor 5 is
accommodated, and a scroll accommodation portion 3b in which the
scroll members 70 and 90 are accommodated.
[0028] Cooling fins 3c for cooling the motor 5 are provided on the
outer periphery of the motor accommodation portion 3a. An exhaust
opening 3d for exhausting air that has been compressed is formed in
an end portion of the scroll accommodation portion 3b. Note that,
although not shown in FIG. 1, an air suction opening for sucking
air is provided in the housing 3.
[0029] The scroll accommodation portion 3b of the housing 3 is
partitioned by partition surfaces P located in the substantially
middle part in the axial direction of the scroll members 70 and 90.
In the housing 3, as illustrated in FIG. 4 described below, flange
parts (fastening portions) 30 that protrude outward are provided in
predetermined positions in the circumferential direction. The
partition surfaces P are fastened by inserting a bolt 32 serving as
a fastening means in the flange parts 30 and by fixing the bolt
32.
[0030] The motor 5 is driven by being supplied with power from a
power supply source (not shown). The rotation control of the motor
5 is performed by a command from a control unit (not shown). A
stator 5a of the motor 5 is fixed to the inner peripheral side of
the housing 3. A rotor 5b of the motor 5 rotates about a driving
rotational axis CL1. A driving shaft 6 extending on the driving
rotational axis CL1 is connected to the rotor 5b. The driving shaft
6 is connected to a driving-side driving shaft 7c of the
driving-side scroll member 70.
[0031] The driving-side scroll member 70 includes a first
driving-side scroll portion 71 on the motor 5 side, and a second
driving-side scroll portion 72 on the exhaust opening 3d side.
[0032] The first driving-side scroll portion 71 includes a first
driving-side end plate 71a and a first driving-side wall 71b.
[0033] The first driving-side end plate 71a is connected to a
driving-side shaft portion 7c connected to the driving shaft 6, and
extends in a direction orthogonal to the driving-side rotational
axis CL1. The driving-side shaft portion 7c is provided so as to be
rotatable with respect to the housing 3 via a driving-side bearing
11 that is a ball bearing.
[0034] The first driving-side end plate 71a has a substantially
disk-like shape when seen in planar view. As illustrated in FIG. 2,
three spiral first driving-side walls 71b, that is, three lines of
spiral first driving-side walls 71b are provided on the first
driving-side end plate 71a. The three lines of first driving-side
walls 71b are provided about the driving-side rotational axis CL1
at regular intervals. Winding ending portions 71e of the first
driving-side walls 71b are not fixed to other wall portions and are
independent. That is, wall portions that connect the winding ending
portions 71e to each other so as to provide reinforcement are not
provided.
[0035] As illustrated in FIG. 1, the second driving-side scroll
portion 72 includes a second driving-side end plate 72a and a
second driving-side wall 72b. Three lines of the second
driving-side walls 72b are provided as with the abovementioned
first driving-side walls 71b (see FIG. 2).
[0036] A second driving-side shaft portion 72c that extends in the
direction of the driving-side rotational axis CL1 is connected to
the second driving-side end plate 72a. The second driving-side
shaft portion 72c is provided so as to be rotatable with respect to
the housing 3 via a second driving-side bearing 14 that is ball
bearing. An exhaust port 72d is formed in the second driving-side
shaft portion 72c along the driving-side rotational axis CL1.
[0037] The first driving-side scroll portion 71 and the second
driving-side scroll portion 72 are fixed in a state in which the
distal ends (free ends) of the walls 71b and 72b face each other.
The first driving-side scroll portion 71 and the second
driving-side scroll portion 72 are fixed by a bolt (wall fixing
portion) 31 fastened to flange parts 73 provided in a plurality of
places in the circumferential direction so as to protrude radially
outward.
[0038] The driven-side scroll member 90 includes a driven-side end
plate 90a provided in substantially the middle in the axial
direction (the horizontal direction in the drawing). A through hole
90h is formed in the middle of the driven-side end plate 90a, and
the air that has been compressed flows to the exhaust port 72d.
[0039] Driven-side walls 91b and 92b are provided on both sides of
the driven-side end plate 90a. The first driven-side wall 91b
provided from the driven-side end plate 90a to the motor 5 side is
engaged with the first driving-side wall 71b of the first
driving-side scroll portion 71, and the second driven-side wall 92b
provided from the driven-side end plate 90a to the exhaust opening
3d side is engaged with the second driving-side wall 72b of the
second driving-side scroll portion 72.
[0040] As illustrated in FIG. 3, three first driven-side walls 91b,
that is, three lines of first driven-side walls 91b are provided.
The three lines of driven-side walls 9b are arranged about a
driven-side rotational axis CL2 at regular intervals.
[0041] A first supporting member 33 and a second supporting member
35 are provided on both ends of the driven-side scroll member 90 in
the axial direction (the horizontal direction in the drawing). The
first supporting member 33 is arranged on the motor 5 side, and the
second supporting member 35 is arranged on the exhaust opening 3d
side. The first supporting member 33 is fixed to the distal end
(free end) of the first driven-side wall 91b by a fastening member
25a such as a pin or a bolt, and the second supporting member 35 is
fixed to the distal end (free end) of the second driven-side wall
92b by a fastening member 25b such as a pin or a bolt. A shaft
portion 33a is provided on the central axis side of the first
supporting member 33, and the shaft portion 33a is fixed to the
housing 3 via a bearing 37 for the first supporting member. A shaft
portion 35a is provided on the central axis side of the second
supporting member 35, and the shaft portion 35a is fixed to the
housing 3 via a bearing 38 for the second supporting member. As a
result, the driven-side scroll member 90 is rotated about a second
central axis CL2 via the supporting members 33 and 35.
[0042] A pin ring mechanism 15 is provided between the first
supporting member 33 and the first driving-side end plate 71a. That
is, a ring member 15a is provided in the first driving-side end
plate 71a, and a pin member 15b is provided in the first supporting
member 33.
[0043] The pin ring mechanism 15 is provided between the second
supporting member 35 and the second driving-side end plate 72a.
That is, the ring member 15a is provided in the second driving-side
end plate 72a, and the pin member 15b is provided in the second
supporting member 35.
[0044] FIG. 4 illustrates a state of the scroll members 70 and 90
seen from the directions of the rotational axes CL1 and CL2. As
illustrated in FIG. 4, the driving-side rotational axis CL1 and the
driven-side rotational axis CL2 are offset from each other by the
turning radius when the scroll members 70 and 90 rotationally move
at the same angular velocity. The flange parts 30 are provided in a
region, which is on the lateral side with respect to a straight
line L1 connecting those rotational axes CL1 and CL2 to each other
and on the periphery of both of the scroll members 70 and 90, and
the partition surfaces P (see FIG. 1) of the housing 3 are fastened
at those positions by bolts. More specifically, the flange parts 30
are provided in a region passing through the rotational axes CL1
and CL2 and orthogonal to the straight line L1. Further, the flange
parts 30 are provided on the inner side with respect to a
circumscribed circle C1 surrounding both of the scroll members 70
and 90.
[0045] A co-rotating scroll compressor 1C of the abovementioned
configuration operates as follows.
[0046] When the driving shaft 6 is rotated about the driving-side
rotational axis CL1 by the motor 5, the driving-side shaft portion
7c connected to the driving shaft 6 also rotates. As a result, the
driving-side scroll member 70 rotates about the driving-side
rotational axis CL1. When the driving-side scroll member 70
rotates, the driving force is transmitted from the supporting
members 33 and 35 to the driven-side scroll member 90 via the pin
ring mechanism 15, and the driven-side scroll member 90 rotates
about the driven-side rotational axis CL2. At this time, the pin
member 15b of the pin ring mechanism 15 moves while being in
contact with the ring member 15a, and hence both of the scroll
members 70 and 90 rotationally move in the same direction at the
same angular velocity.
[0047] When both of the scroll members 70 and 90 rotationally move,
the air sucked from the suction opening in the housing 3 is sucked
from the outer peripheral side of both of the scroll members 70 and
90, and is taken into a compression chamber formed by both of the
scroll members 70 and 90. Then, a compression chamber formed by the
first driving-side wall 71b and the first driven-side wall 91b, and
a compression chamber formed by the second driving-side wall 72b
and the second driven-side wall 92b are separately compressed. The
capacity of the compression chambers decreases as the compression
chambers approach the center side, and the air is compressed
accordingly. The air compressed by the first driving-side wall 71b
and the first driven-side wall 91b passes through the through hole
90h formed in the driven-side end plate 90a, and is merged with air
compressed by the second driving-side wall 72b and the second
driven-side wall 92b. The merged air passes through the exhaust
port 72d and is exhausted to the outside from the exhaust opening
3d in the housing 3. The exhausted compressed air is guided to an
internal combustion engine (not shown) and is used as combustion
air.
[0048] According to this embodiment, the following effects are
exhibited.
[0049] In the case of the co-rotating scroll compressor 1A, the
rotational axes CL1 and CL2 of the scroll members 70 and 90 are
provided so as to be parallel to each other and offset from each
other by the distance with which a compression chamber can be
formed. Therefore, when both of the scroll members 70 and 90 are
seen from the rotational axis (see FIG. 4), the projected shape of
both of the scroll members 70 and 90 becomes an elliptical shape
having the major axis in the direction in which the rotational axes
CL1 and CL2 are connected to each other. Therefore, a space is
formed in the region on the periphery of both of the scroll members
70 and 90 and on the lateral side when seen from the straight line
L1 connecting both of the rotational axes CL1 and CL2 of the scroll
members 70 and 90 to each other. The partition surfaces P are
fastened by providing the flange parts 30 in the region, and hence
the external form of the housing 3 can be caused to be as small as
possible, and the co-rotating scroll compressor 1A can be
configured in a compact manner.
[0050] Further, as illustrated in FIG. 4, the flange parts 30 are
provided on the inner side with respect to the circumscribed circle
C1 surrounding both of the scroll members 70 and 90, and hence the
housing 3 can be configured in a compact manner.
[0051] Note that, in this embodiment, two flange parts 30 are
provided, but the present invention is not limited thereto, and
three or more flange parts 30 may be provided.
[0052] Further, the arrangement positions of the flange parts 30
are provided in the region passing through the rotational axes CL1
and CL2 and orthogonal to the straight line L1 in FIG. 4, but are
not limited to the region. The arrangement positions may be
provided in a region rotated from those positions about the
rotational axes CL1 and CL2.
Second Embodiment
[0053] Next, a second embodiment of the present invention is
described with reference to FIG. 5.
[0054] This embodiment describes positions for forming mounting
holes 80 in the co-rotating scroll compressor 1A of the first
embodiment. Therefore, in FIG. 5, a compressor similar to the
double rotating scroll-type compression 1A of the first embodiment
is illustrated, and positions of the mounting holes 80 formed in
the housing 3 are added.
[0055] The mounting holes 80 are used to connect the co-rotating
scroll compressor 1A to an external structure such as an engine.
Specifically, the mounting holes 80 are used as holes for attaching
mounting feet in order to perform mounting with respect to the
external structure.
[0056] As illustrated in FIG. 5, the mounting holes 80 are formed
on the outer peripheral side of the driving-side bearings 11 and
the bearing 37 for the first supporting member and the outer
peripheral side of the second driving-side shaft 14 and the bearing
38 for the second supporting member. The mounting holes 80 are
formed as through holes.
[0057] As described above, in this embodiment, it is focused on the
feature in which predetermined spaces can be secured between the
outer peripheral side of the bearings 11, 14, 37, and 38 and the
external form of the housing 3. By forming the mounting holes 80 in
those spaces, the mounting holes 80 can be formed without upsizing
the external form of the housing 3, and hence the co-rotating
scroll compressor 1A can be configured in a compact manner.
[0058] Further, as illustrated in FIG. 6, the mounting holes 80 may
be formed on the outer peripheral side of the bearings 11, 14, 37,
and 38 as bottomed holes.
[0059] Note that, in the abovementioned embodiments, the
co-rotating scroll compressor is used as a supercharger, but the
present invention is not limited thereto, and the co-rotating
scroll compressor can be widely used as long as fluid is
compressed. For example, the co-rotating scroll compressor can be
used as a refrigerant compressor used in an air conditioning
unit.
REFERENCE SIGNS LIST
[0060] 1A co-rotating scroll compressor [0061] 3 housing [0062] 3a
motor accommodation portion [0063] 3b scroll accommodation portion
[0064] 3c cooling fin [0065] 3d exhaust opening [0066] 5 motor
(drive unit) [0067] 5a stator [0068] 5b rotor [0069] 6 driving
shaft [0070] 7c driving-side shaft portion [0071] 11 driving-side
bearing [0072] 15 pin ring mechanism (synchronous driving
mechanism) [0073] 15a ring member [0074] 15b pin member [0075] 25a
fastening member [0076] 25b fastening member [0077] 30 flange part
(fastening portion) [0078] 31 bolt (wall fixing portion) [0079] 32
bolt [0080] 33 first supporting member [0081] 33a shaft portion
[0082] 35 second supporting member [0083] 35a shaft portion [0084]
37 bearing for first supporting member [0085] 38 bearing for second
supporting member [0086] 70 driving-side scroll member [0087] 71
first driving-side scroll portion [0088] 71a first driving-side end
plate [0089] 71b first driving-side wall [0090] 72 second
driving-side scroll portion [0091] 72a second driving-side end
plate [0092] 72b second driving-side wall [0093] 72c second
driving-side shaft portion [0094] 72d exhaust port [0095] 73 flange
part [0096] 90 driven-side scroll member [0097] 90a driven-side end
plate [0098] 90h through hole [0099] 91b first driven-side wall
[0100] 92b second driven-side wall [0101] L1 straight line [0102] P
partition surface
* * * * *