U.S. patent application number 13/808823 was filed with the patent office on 2013-08-15 for scroll compressor.
This patent application is currently assigned to Sanden Corporation. The applicant listed for this patent is Yuji Takei. Invention is credited to Yuji Takei.
Application Number | 20130209305 13/808823 |
Document ID | / |
Family ID | 45441132 |
Filed Date | 2013-08-15 |
United States Patent
Application |
20130209305 |
Kind Code |
A1 |
Takei; Yuji |
August 15, 2013 |
SCROLL COMPRESSOR
Abstract
A scroll compressor configured in such a manner that a back
pressure chamber is formed on the back surface side of the movable
scroll using an annular seal means, and pressurized fluid is
introduced into the back pressure chamber through a pressure
introduction hole. A thrust bearing member which is a separate
member from the seal means and bears a thrust force acting toward
the main bearing member from the bottom plate section side of the
movable scroll is disposed between the back surface of the bottom
plate section of the movable scroll and the front surface of the
main bearing member which faces the back surface of the bottom
plate section. The scroll compressor is configured in such a manner
that the scroll compressor can satisfy the demand for more
compactness and that a reduction in the durability and sealing
function of the annular seal means can be minimized.
Inventors: |
Takei; Yuji; (Isesaki-shi,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Takei; Yuji |
Isesaki-shi |
|
JP |
|
|
Assignee: |
Sanden Corporation
Gunma
JP
|
Family ID: |
45441132 |
Appl. No.: |
13/808823 |
Filed: |
June 29, 2011 |
PCT Filed: |
June 29, 2011 |
PCT NO: |
PCT/JP2011/064885 |
371 Date: |
February 7, 2013 |
Current U.S.
Class: |
418/55.3 |
Current CPC
Class: |
F04C 23/008 20130101;
F04C 18/0253 20130101; F04C 2240/50 20130101; F04C 27/005 20130101;
F04C 18/0215 20130101 |
Class at
Publication: |
418/55.3 |
International
Class: |
F04C 18/02 20060101
F04C018/02 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 6, 2010 |
JP |
2010-153750 |
Claims
1. A scroll compressor, which has a scroll type compression
mechanism consisting of a fixed scroll and a movable scroll to
swing relatively to the fixed scroll and which comprises a shaft
having an eccentric crank part on an end and driving the movable
scroll by the crank part, a main bearing member to rotatably
support the shaft through a main bearing, a rotation preventing
mechanism which is provided between a back face of a bottom plate
part of the movable scroll and a front face of the main bearing
member facing the back face and which prevents the movable scroll
from rotating, a back pressure chamber formed as a space between
the back face of the bottom plate part of the movable scroll and
the front face of the main bearing member facing the back face, at
least one annular groove formed on a side either of the back face
of the bottom plate part of the movable scroll or the front face of
the main bearing member, a seal means which is movably attached in
the annular groove and which is brought into sliding contact with
another side, a shaft seal means attached between the shaft and the
main bearing member, and a pressure inlet hole through which a
pressurized fluid is supplied into the back pressure chamber as a
sealed space sealed by the seal means and the shaft seal means,
characterized in that a thrust bearing member, which bears a thrust
force subjected from the bottom plate side of the movable scroll to
the main bearing member side, is interposed as a member other than
the seal means.
2. The scroll compressor according to claim 1, wherein the thrust
bearing member is interposed such that the bottom plate part of the
movable scroll contacts the thrust bearing member when the
compressor starts up and the bottom plate part doesn't contact
thrust bearing members in a steady operation.
3. The scroll compressor according to claim 1, wherein the thrust
bearing member is made of a plate member which annularly extends on
the front face of the main bearing member in a circumferential
direction.
4. The scroll compressor according to claim 1, wherein the thrust
bearing member is made of a plurality of circular members which are
formed on the front face of the main bearing member and which are
freely fitted in a plurality of circular grooves placed
intermittently in the circumferential direction.
5. The scroll compressor according to claim 1, wherein the thrust
bearing member is made of metal or resin being of abrasion
resistance.
6. The scroll compressor according to claim 1, wherein the annular
groove and the seal means are placed at a position including the
rotation preventing mechanism in a radial direction.
7. The scroll compressor according to claim 1, wherein the
compressor is mounted in an air-conditioning system for vehicles.
Description
TECHNICAL FIELD OF THE INVENTION
[0001] The present invention relates to a scroll compressor, and
specifically relates to improvements of a back pressure mechanism
section provided at the back side of a movable scroll constituting
the scroll compression mechanism.
BACKGROUND ART OF THE INVENTION
[0002] Well known is a scroll compressor having a scroll
compression mechanism made by a fixed scroll and a movable scroll
to swing around the fixed scroll. In such a scroll compressor, a
compressive reaction force of fluid being compressed might generate
a thrust load on the movable scroll, so as to cause the abrasion
between the movable scroll and a housing supporting the movable
scroll. In order to suppress such an abrasion, known is an
effective measure where the pressurized fluid is introduced from
the inside of the compression mechanism to the back side of the
movable scroll so as to react a back pressure to the movable scroll
in a direction opposing the thrust load, so that the back pressure
reduces the thrust load which might cause the abrasion, etc.
[0003] Patent document 1 discloses a scroll compressor, comprising
a back pressure chamber formed as a space between a back face of a
bottom plate section of a movable scroll and a front face of main
bearing member surface facing it, at least one annular groove
formed on either the back face or the front face, an annular seal
means which is movably attached to the inside of the annular groove
and is brought into sliding contact with the other face, an annular
shaft seal means which is movably attached to the inside of a gap
between a crankshaft to drive the movable scroll and the main
bearing member, and a pressure inlet hole to supply pressurized
fluid to the back pressure chamber which is formed by sealing the
gap with the seal means and the shaft seal means at the back face
side of the bottom plate of the movable scroll.
PRIOR ART DOCUMENTS
Patent documents
[0004] Patent document 1: JP-4262949-B
SUMMARY OF THE INVENTION
Problems to be Solved by the Invention
[0005] However, it may be difficult to provide the back pressure
mechanism on the back plate side of the bottom plate section of the
movable scroll in the same radius as a compressor without the back
pressure mechanism, because the above-described annular groove and
an annular seal means to be attached to the groove are required
while it is necessary to provide a rotation preventing mechanism of
the movable scroll at the back face side thereof. In addition,
because the annular groove and the annular seal means to form the
back pressure chamber are located at the side of inside diameter of
the rotation preventing mechanism of the movable scroll in a
structure disclosed in Patent document 1, such a seal means, etc.,
which define the radial directional size of the back pressure
chamber, are positioned as corresponding to comparatively small
radius, so that the area to bear the back pressure in the back
pressure chamber becomes comparatively small. In order to increase
the pressure-bearing area of the back pressure chamber, it is
necessary for the compressor to make its shell diameter larger, and
therefore, it becomes difficult for the compressor to make compact
as a whole. On the other hand, in order to generate a predetermined
force from the back pressure without increasing the shell diameter
of the compressor, it is necessary to increase pressure in the back
pressure chamber. In such a case, fluid which has been introduced
from the compression mechanism to the inside of the back pressure
chamber tends to leak from the seal section forming the back
pressure chamber. And then, the volume efficiency of the compressor
might deteriorate when the leakage becomes great. Further, when the
pressure increases in the back pressure chamber, the annular seal
means might deteriorate greatly in durability and sealing
performance with age, etc.
[0006] Accordingly, focused on the above-described problems, an
object of the present invention is to provide a scroll compressor,
in which a desirable back pressure mechanism can be realized
without increasing the shell diameter of the compressor and the
pressure can be kept low in the back pressure chamber as making the
pressure-bearing area in the back pressure chamber greater, so as
to meet a demand to downsize compressors and to improve the volume
efficiency of the compressor by reducing the leakage at the sealed
region in the back pressure chamber, while the annular seal means
is prevented from aging deterioration, etc., in durability and
sealing performance by reducing pressure in the back pressure
chamber, the rotation preventing mechanism of the movable scroll is
well lubricated and the reliability is improved.
Means for Solving the Problems
[0007] To achieve the above-described object, a scroll compressor
according to the present invention is a scroll compressor which has
a scroll type compression mechanism consisting of a fixed scroll
and a movable scroll to swing relatively to the fixed scroll and
which comprises a shaft having an eccentric crank part on an end
and driving the movable scroll by the crank part, a main bearing
member to rotatably support the shaft through a main bearing, a
rotation preventing mechanism which is provided between a back face
of a bottom plate part of the movable scroll and a front face of
the main bearing member facing the back face and which prevents the
movable scroll from rotating, a back pressure chamber formed as a
space between the back face of the bottom plate part of the movable
scroll and the front face of the main bearing member facing the
back face, at least one annular groove formed on a side either of
the back face of the bottom plate part of the movable scroll or the
front face of the main bearing member, a seal means which is
movably attached in the annular groove and which is brought into
sliding contact with another side, a shaft seal means attached
between the shaft and the main bearing member, and a pressure inlet
hole through which a pressurized fluid is supplied into the back
pressure chamber as a sealed space sealed by the seal means and the
shaft seal means, characterized in that a thrust bearing member,
which bears a thrust force subjected from the bottom plate side of
the movable scroll to the main bearing member side, is interposed
as a member other than the seal means.
[0008] In such a scroll compressor according to the present
invention, a thrust bearing member is interposed separately from
the annular seal means which is attached to the annular groove to
form the back pressure chamber, so that the annular seal means,
which has had both functions of the seal function and the thrust
force bearing function in a conventional structure, chiefly has
charge of only the seal function and that the thrust bearing member
has charge of the thrust force bearing function. Namely, the
annular seal means can specialize in the seal function by omitting
the function for bearing a thrust force. Consequently, the annular
seal means can be designed flexibly, so as to increase the seal
performance and the durability. Such a high seal performance and a
high durability makes it possible that the back pressure chamber
has charge of desirable back pressure function, such as thrust load
reduction function and pushing function toward the fixed scroll
side, with respect to the movable scroll. Therefore, it is possible
that the abrasion derived from the thrust load is suppressed so as
to improve the volume efficiency and the coefficient of performance
of the compressor.
[0009] In the scroll compressor according to the present invention,
it is preferable that the thrust bearing member is interposed such
that the bottom plate part of the movable scroll contacts the
thrust bearing member when the compressor starts up and the bottom
plate part doesn't contact thrust bearing members in a steady
operation. Because inner pressure of the back pressure chamber may
not be sufficient at the start up, comparatively great thrust load
might be applied to the front face of the main bearing member from
the bottom plate part of the movable scroll. If the bottom plate
part of the movable scroll contacts the thrust bearing member, the
thrust bearing member can surely bear the thrust load to prevent
the annular seal means from being subjected to the thrust load
undesirably. Therefore, the abrasion derived from the thrust load
can be suppressed while the annular seal means have further
excellent seal performance and further excellent durability. On the
other hand, since the pressurized fluid is supplied into the back
pressure chamber sufficiently in a stable operation so that the
inner pressure of the back pressure chamber is kept high enough to
bear the thrust load, the non-contact between the bottom plate part
of the movable scroll and the thrust bearing member can improve the
durability and the lifetime of the thrust bearing member.
[0010] In the scroll compressor according to the present invention,
various embodiments can be employed for the thrust bearing member.
For example, it is possible that the thrust bearing member is made
of a plate member which annularly extends on the front face of the
main bearing member in a circumferential direction, or that the
thrust bearing member is made of a plurality of circular members
which are formed on the front face of the main bearing member and
which are freely fitted (namely, which are movably attached) in a
plurality of circular grooves placed intermittently in the
circumferential direction. In each embodiment, it is preferable
that the thrust bearing member is made of material, such as metal
and resin, having high abrasion resistance to have charge of the
thrust load.
[0011] In addition to the above-described improvement of the seal
performance and the durability achieved by increasing the
flexibility in designing the annular seal means, it is possible
that the annular groove and the seal means are placed at a position
including the rotation preventing mechanism in a radial direction
so that the annular seal means is provided as having larger outer
shape than the position disclosed in Patent document 1. Then the
radial dimension of the back pressure chamber is increased, so as
to enlarge the pressure-bearing area in the back pressure chamber.
Namely, the pressure-bearing area can be extended in the back
pressure chamber without extending the shell diameter of the
compressor. Therefore, demand to downsize the compressor can be
satisfied and the lowered pressure in the back pressure chamber can
reduce the leakage at the sealed region in the back pressure
chamber, so as to improve the volume efficiency of the compressor.
Further, the lowered pressure in the back pressure chamber can
reduce the loading condition of the annular seal means, so that the
annular seal means are prevented from deteriorating in durability
and the seal performance across the ages, etc, so as to improve the
seal performance and the durability further. Furthermore, because
the rotation preventing mechanism section of the movable scroll can
be incorporated substantively in the back pressure chamber, the
pressurized fluid containing lubricant oil introduced in the back
pressure chamber through the pressure inlet hole from the
compression mechanism can be utilized to lubricate the rotation
preventing mechanism section, so as to improve the durability and
the reliability.
[0012] Thus the present invention makes it possible that the back
pressure chamber which allows low pressure and has desirable
pressure-bearing area can be configured without extending the shell
diameter of the compressor, as achieving the excellent seal
performance, durability and reliability of the back pressure
mechanism section. Therefore, the present invention is suitable to
a compressor in an air-conditioning system for vehicles, which
strongly demands downsizing and durability improvement.
Effect According to the Invention
[0013] In the scroll compressor according to the present invention,
the sealing performance, durability and reliability, etc., can be
excellent in the back pressure chamber, so as to achieve higher
volume efficiency and higher coefficient of performance compared to
a compressor which doesn't have a back pressure mechanism. In
addition, a compact and highly efficient scroll compressor can be
provided without increasing the shell diameter of the compressor,
because the back pressure chamber, of which sealing performance and
durability are excellent and of which pressure-bearing area is kept
large so as to require only low pressure, can be designed while the
shell diameter of the compressor is the same as a compressor which
doesn't have a back pressure mechanism.
BRIEF EXPLANATION OF THE DRAWINGS
[0014] FIG. 1 is a longitudinal section view of a scroll compressor
according to the first embodiment of the present invention.
[0015] FIG. 2 is a longitudinal section view of a scroll compressor
according to the second embodiment of the present invention.
[0016] FIG. 3 is an enlarged section view of a main part of the
first embodiment.
[0017] FIG. 4 is an enlarged section view of a main part of the
second embodiment.
[0018] FIG. 5 is a plan view of a main bearing member provided with
thrust bearing member in the first embodiment.
[0019] FIG. 6 is a plan view of a main bearing member provided with
thrust bearing member in the second embodiment.
[0020] FIG. 7 is a plan view showing a back face of a bottom plate
of a movable scroll in the present invention.
EMBODIMENTS FOR CARRYING OUT THE INVENTION
[0021] Hereinafter, desirable embodiments will be explained as
referring to figures.
[0022] FIG. 1 shows scroll compressor 100 according to the first
embodiment of the present invention and FIG. 2 shows scroll
compressor 200 according to the second embodiment of the present
invention. Both of them are configured to be an electric compressor
having built-in motor. Scroll compressors 100 and 200 are used as a
compressor for compressing refrigerant for an air conditioning
system for vehicles, etc. The first embodiment and the second
embodiment are different only in thrust bearing members. Because
the other parts are substantively the same, thrust bearing members
are explained by different symbols while the same symbols are used
to explain the same component parts as referring to FIGS. 1 and 2
together.
[0023] In FIG. 1 and FIG. 2, scroll compressors 100 and 200 have
scroll compression mechanism 3 consisting of fixed scroll 1 and
movable scroll 2 to swing around fixed scroll 1. While moving
toward the center of fluid pocket 4 formed in scroll compression
mechanism 3, fluid, such as refrigerant, taken into fluid pocket 4
is supposed to be compressed. The compressed fluid is discharged in
discharge chamber 7 formed in rear plate 6 from discharge hole 5
provided at the center of fixed scroll 1, and is delivered to the
external circuit (not shown) through discharge port section 9 after
lubricating oil contained is separated therefrom in separator pipe
8.
[0024] In this embodiment, fixed scroll 1 is fixed inside of an end
of stator housing 10, and rear plate 6 is fixed to an end face of
stator housing 10 with bolts, etc. Motor 12 which drives to rotate
shaft 11 for driving movable scroll 2 is built inside the other end
of stator housing 10. Motor 12 comprises stator 13 fixed inside
stator housing 10 and rotor 14 to rotate around stator 13, and
shaft rotates together with rotor 14. Shaft 11 is rotatably
supported by front bearing 17 attached to inverter case 16 housing
inverter section 15 and main bearing 19 attached to main bearing
member 18 fixed inside stator housing 10. Crank section (crank pin)
20 is formed at a position eccentric to the center of shaft 11 at
an end of shaft 11. Crank section 20 is inserted in eccentric
bushing 22 which is rotatably supported by drive bearing 21 at the
back side of movable scroll 2, and is swung as accompanied by the
rotation of shaft 11 through crank section 20, eccentric bushing 22
and drive bearing 21 in a condition where movable scroll 2 is
prevented from rotating. Counter weight 23 is formed integrally
with eccentric bushing 22. Rotation preventing mechanism 24 of
movable scroll 2 comprises rotation preventing ring 26 attached in
hole 25 formed on the back face of movable scroll 2 and rotation
preventing pin 27 provided as extruding from main bearing member 18
in rotation preventing ring 26, while a plurality of rotation
preventing mechanisms 24 consisting of ring 26 and pin 27 are
arranged in a circumferential direction.
[0025] Back pressure chamber 28 is formed as a space between the
back face of bottom plate part 2a of movable scroll 2 and the front
face of main bearing member 18 facing the back face. Back pressure
chamber 28 is formed into a sealed space sealed by a seal section
comprising at least one annular groove 29 formed on the back face
of bottom plate part 2a of movable scroll 2 and annular seal 30 as
an annular seal means, which is attached in groove 29 and is
brought into sliding contact with the front face of main bearing
member 18, and another seal section having shaft seal 31 attached
between the outer peripheral surface of shaft 11 and the inner
peripheral surface of main bearing member 18 at the side of main
bearing 19. In back pressure chamber 28, pressurized fluid is
supplied from the inside of compression mechanism 3 through
pressure inlet hole 32 perforated on bottom plate part 2a of
movable scroll 2. The pressurized fluid introduced into back
pressure chamber 28 makes inner pressure of back pressure chamber
28 act on movable scroll 2, so that the thrust load, which is a
force to push movable scroll 2 toward main bearing member 18 and is
caused by compressive reaction force to act on movable scroll 2, is
reduced, or that movable scroll 2 is pushed toward fixed scroll 1.
In this embodiment, the fluid pressurized in compression mechanism
3 is supplied into back pressure chamber 28 through pressure inlet
hole 32 from compression mechanism 3. Alternatively, it is possible
that the fluid is supplied from a discharge chamber or an oil
separation chamber of the compressor into back pressure chamber
28.
[0026] A seal section comprising annular groove 29 and annular seal
30 which make back pressure chamber 28 a sealed space is positioned
at a place including rotation preventing mechanism 24, and the
pressure-bearing area is sufficiently ensured at bottom plate part
2a of movable scroll 2 in back pressure chamber 28. Enlargement of
such positioned pressure-bearing area in back pressure chamber 28
makes it possible to reduce inner pressure of back pressure chamber
28, so as to design annular seal 20 more flexibly and to improve
the sealing performance and the durability of annular seal 30. Such
a positioning makes it possible that the pressure-bearing area in
back pressure chamber 28 is increased without increasing the shell
diameter of the compressor and the compressor is prevented from
growing in size caused by providing a back pressure mechanism, so
that the compressor is downsized while high seal performance and
durability is ensured.
[0027] Between the back face of bottom plate part 2a of movable
scroll 2 and the front face of main bearing member 18 facing it,
thrust bearing members 33 (shown in FIG. 1) and 34 (shown in FIG.
2) are interposed separately from annular seal 30 and movably in an
axial direction, at a position closer to the inside diameter than
annular seal 30. With such a positioning of thrust bearing members
33 and 34, it is possible that annular seal 30 is designed to
specialize the seal performance since the trust force which is
applied from the side of movable scroll 2 toward main bearing
member 18 is born only by thrust bearing members 33 and 34 without
making annular seal 30 bear the trust force. Therefore, the seal
performance and durability of annular seal 30 can be improved
greatly. Namely, annular seal 30 doesn't have to bear the thrust
force and can be designed especially focused on its seal
performance. Therefore, annular seal 30 can be designed in a great
flexibility, so that appropriate design with appropriate materials
make the seal performance and the durability of annular seal 30
greatly improved. In addition to the reduction of inner pressure of
back pressure chamber 28 by increasing the pressure-bearing area in
back pressure chamber 28, such a great improvement in seal
performance and durability of annular seal 30 can greatly reduce
the leakage of the fluid introduced into back pressure chamber 28
from a region of annular seal 30, so as to improve the volume
efficiency and the coefficient of performance of the compressor. As
described above, thrust bearing members 33 and 34 can be designed
such that bottom plate part 2a of movable scroll 2 contacts thrust
bearing members 33 and 34 when the compressor starts up and the
bottom plate part doesn't contact thrust bearing members
substantively in a steady operation. Therefore the durability of
annular seal 30 and thrust bearing members 33 and 34 can be
improved.
[0028] The above-described superior function effect is accomplished
by function separation, where annular seal 30 only takes charge of
the seal function and thrust bearing members 33 and 34 only take
charge of being subjected to the thrust load. This function
separation can be achieved by thrust bearing members 33 and 34 as
members provided other than annular seal 30.
[0029] Hereinafter, thrust bearing members 33, 34 will be explained
concretely as referring to examples. The first embodiment as shown
in FIG. 1 can also be configured as shown in FIG. 3 and FIG. 5. The
second embodiment as shown in FIG. 2 can also be configured as
shown in FIG. 4 and FIG. 6. In the first embodiment, shallow
annular low-level step 41 may be formed on the front face of main
bearing member 18 which faces movable scroll 2 as shown in FIG. 3.
Thrust bearing member 33, which has been made of comparatively thin
plate material as extending annularly, can be placed on low-level
step 41 so that thrust bearing member 33 is supported between
low-level step 41 and the back face of bottom plate part 2a of
movable scroll 2. In order to prevent thrust bearing member 33 from
interfering with rotation preventing pin 27 extruding from the
front face of main bearing member 18, it is possible that opening
42 through which rotation preventing pin 27 is inserted is formed
on thrust bearing member 33 as shown in FIG. 5. Further, outer
peripheral surface of thrust bearing member 33 on the front face of
main bearing member 18 can be ensured as a broad area of seal
surface 43 brought into sliding contact with annular seal 30 to
swing together with movable scroll 2 as shown in FIG. 5. It is
preferable that an abrasion-resistant metal plate, such as carbon
tool steels called SK material in Japan, is employed as the
comparatively thin plate material to form thrust bearing member 33.
Such a metal plate can achieve a desirable surface roughness
easily.
[0030] In the second embodiment, a plurality of grooves 51
extending circularly in a circumferential direction are
intermittently formed on the front face of main bearing member 18
facing movable scroll 2 in a condition where arc-like thrust
bearing member 34 freely fits in each groove 51, as shown in FIG. 4
and FIG. 6. Arc-like grooves 51 and arc-like thrust bearing members
34 are placed away from rotation preventing pins 27. Outer
peripheral surface of grooves 51 and thrust bearing members 34 on
the front face of main bearing member 18 can be ensured as a broad
area of seal surface 52 brought into sliding contact with annular
seal 30 to swing together with movable scroll 2 as shown in FIG. 6.
It is preferable that an abrasion-resistant resin (particularly
engineering plastic), such as polyphenylene sulfide, is employed as
the arc-like member material to form thrust bearing material 34.
Such a resin can achieve a desirable sliding performance
easily.
[0031] On the other hand, as to a structure at the side of back
face 61 of bottom plate 2a of movable scroll 2, rotation preventing
rings 26 are attached to holes 25 for a rotation preventing rings
which are formed at the outer side of hole 62 for drive bearing 21
which is formed at the center as shown in FIG. 7. Annular groove 29
is formed as surrounding a plurality of rotation preventing rings
26 (rotation preventing mechanism), and annular seal 30 is attached
to groove 29.
INDUSTRIAL APPLICATIONS OF THE INVENTION
[0032] The structure of the scroll compressor according to the
present invention is applicable to every scroll compressor, and is
suitable for a compressor for an air-conditioning system for
vehicles, which strongly requires downsizing and durability
improvement.
EXPLANATION OF SYMBOLS
[0033] 1: fixed scroll [0034] 2: movable scroll [0035] 2a: bottom
plate part of movable scroll [0036] 3: scroll compression mechanism
[0037] 4: fluid pocket [0038] 5: discharge hole [0039] 6: rear
plate [0040] 7: discharge chamber [0041] 8: separator pipe [0042]
9: discharge port section [0043] 10: stator housing [0044] 11:
shaft [0045] 12: motor [0046] 13: stator [0047] 14: rotor [0048]
15: inverter section [0049] 16: inverter case [0050] 17: front
bearing [0051] 18: main bearing member [0052] 19: main bearing
[0053] 20: crank section [0054] 21: drive bearing [0055] 22:
eccentric bushing [0056] 23: counter weight [0057] 24: rotation
preventing mechanism [0058] 25: hole [0059] 26: rotation preventing
ring [0060] 27: rotation preventing pin [0061] 28: back pressure
chamber [0062] 29: annular groove [0063] 30: annular seal [0064]
31: shaft seal [0065] 32: pressure inlet hole [0066] 33, 34: thrust
bearing member [0067] 41: low-level step [0068] 42: opening [0069]
43: seal surface of annular seal [0070] 51: circular groove [0071]
52: seal surface of annular seal [0072] 61: back face of bottom
plate [0073] 62: hole of drive bearing [0074] 100, 200: scroll
compressor
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