U.S. patent application number 16/477009 was filed with the patent office on 2019-11-21 for 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, Takuma YAMASHITA.
Application Number | 20190353160 16/477009 |
Document ID | / |
Family ID | 62979053 |
Filed Date | 2019-11-21 |
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United States Patent
Application |
20190353160 |
Kind Code |
A1 |
HIRATA; Hirofumi ; et
al. |
November 21, 2019 |
SCROLL COMPRESSOR
Abstract
The scroll compressor includes scroll members that include a
compression chamber to compress working fluid, a housing that
houses the scroll members, a second driving-side shaft portion that
discharges the compressed working fluid from the compression
chamber and is rotated around an axis with respect to the housing,
a bearing that rotatably supports the housing with respect to the
second driving-side shaft portion , and a seal member between the
second driving-side shaft portion and the housing . A lubricant is
provided between the bearing and the seal member.
Inventors: |
HIRATA; Hirofumi; (Tokyo,
JP) ; ITO; Takahide; (Tokyo, JP) ; YAMASHITA;
Takuma; (Tokyo, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
MITSUBISHI HEAVY INDUSTRIES, LTD. |
Tokyo |
|
JP |
|
|
Assignee: |
MITSUBISHI HEAVY INDUSTRIES,
LTD.
Tokyo
JP
|
Family ID: |
62979053 |
Appl. No.: |
16/477009 |
Filed: |
January 25, 2018 |
PCT Filed: |
January 25, 2018 |
PCT NO: |
PCT/JP2018/002175 |
371 Date: |
July 10, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F04C 15/0088 20130101;
F04C 29/02 20130101; F04C 29/12 20130101; F04C 2/045 20130101; F04C
2240/56 20130101; F04C 18/0238 20130101; F16J 15/3204 20130101;
F04C 27/009 20130101 |
International
Class: |
F04C 2/04 20060101
F04C002/04; F04C 15/00 20060101 F04C015/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 27, 2017 |
JP |
2017-013326 |
Claims
1. A scroll compressor, comprising: paired scroll members that
include a compression chamber to compress working fluid; a housing
that houses the paired scroll members; a discharge cylinder that
discharges the compressed working fluid from the compression
chamber and is rotated around an axis with respect to the housing;
a bearing that rotatably supports the discharge cylinder with
respect to the housing; and a seal member that is located between
the discharge cylinder and the housing, wherein a lubricant is
enclosed in a space formed between the bearing and the seal
member.
2. The scroll compressor according to claim 1, wherein the bearing
is a rolling bearing including seal plates on respective side
surfaces, and the seal plates are fixed to an outer ring of the
bearing and are not in contact with an inner ring of the
bearing.
3. The scroll compressor according to claim 1, wherein the bearing
is a rolling bearing including a seal plate on a side surface on
side opposite to the seal member side, and does not include a seal
plate on a side surface on the seal member side.
4. The scroll compressor according to claim 1, wherein the seal
member is an oil seal.
5. The scroll compressor according to claim 1, further comprising a
driving shaft that is rotationally driven by a driving unit,
wherein the scroll compressor is configured as a double rotating
scroll compressor that includes a driving-side scroll member and a
driven-side scroll member as the paired scroll members, the
driving-side scroll member being coupled to the driving shaft and
performing rotational movement, and the driven-side scroll member
receiving power transmitted from the driving-side scroll member to
perform rotational movement.
Description
TECHNICAL FIELD
[0001] The present disclosure relates to a scroll compressor
suitably used for, for example, a double rotating scroll
compressor.
BACKGROUND ART
[0002] A double rotating scroll compressor has been well-known
(refer to PTL 1). Such a double rotating scroll compressor includes
a seal plate on a front end surface of a discharge cylinder. The
seal plate seals high-pressure side occupied by compressed working
fluid and low-pressure side that is an internal space of a
housing.
CITATION LIST
Patent Literature
[0003] [PTL 1] Japanese Unexamined Patent Application, Publication
No. 2015-1175
SUMMARY OF INVENTION
Technical Problem
[0004] In PTL 1, a seal plate 48 sandwiched between a front end
surface of a discharge cylinder 46 and a boss portion 50 is
compressed in an axis direction to achieve sealing (reference
numerals are those described in PTL 1). In a case where force
pressing the seal plate in the axis direction is not sufficient,
however, sealability may be deteriorated.
[0005] In contrast, it is conceivable to have a configuration to
seal an outer peripheral surface of the discharge cylinder that is
rotated around the axis. When a seal member is disposed on an outer
periphery of the discharge cylinder, however, an axial dimension of
the discharge cylinder is increased and pressure loss is
increased.
[0006] Further, in a case of an oilless compressor in which no
misty oil is contained in the fluid to be compressed, it is
necessary to supply a lubricant to lubricate the sealing
member.
[0007] The present disclosure is made in consideration of such
circumstances, and an object of the present disclosure is to
provide a scroll compressor that makes it possible to reduce the
axial dimension of the discharge cylinder rotated around the axis
while supplying a lubricant when the outer peripheral surface of
the discharge cylinder is sealed.
Solution to Problem
[0008] To solve the above-described issues, a scroll compressor
according to the present disclosure adopts the following solutions.
The scroll compressor according to the present disclosure includes
paired scroll members that include a compression chamber to
compress working fluid, a housing that houses the paired scroll
members, a discharge cylinder that discharges the compressed
working fluid from the compression chamber and is rotated around an
axis with respect to the housing, a bearing that rotatably supports
the discharge cylinder with respect to the housing, and a seal
member that is provided on outlet side of the discharge cylinder
relative to the bearing and seals an outer peripheral surface of
the discharge cylinder. A lubricant is enclosed in a space formed
between the bearing and the seal member.
[0009] The space is formed between the seal member and the bearing
that rotatably supports the discharge cylinder, and the lubricant
is enclosed in the space. This makes it possible to configure the
space in which the lubricant is enclosed, without waste. For
example, as compared with a configuration in which two seal members
are disposed side by side in the axis direction and the lubricant
is enclosed in a space between the seal members, it is sufficient
to provide one seal member, and it is possible to reduce the number
of components and to reduce the axial dimension of the discharge
cylinder. Accordingly, the outer peripheral surface of the
discharge cylinder can be sealed in compact, and pressure loss of
the working fluid can be reduced.
[0010] In particular, even in an oilless compressor in which the
working fluid contains no lubricant oil, lubrication of the seal
member is achieved by the lubricant enclosed between the seal
member and the bearing, which allows for reduction of wear.
[0011] Even when the oilless compressor is used in a case where
clean working fluid containing no oil is desired in a demander of
the compressed working fluid, the scroll compressor according to
the present disclosure can reduce wear of the seal member.
[0012] Further, in the scroll compressor according to the present
disclosure, the bearing may be a rolling bearing including seal
plates on respective side surfaces, and the seal plates may be
fixed to an outer ring of the bearing and may be not in contact
with an inner ring of the bearing.
[0013] In the case where the rolling bearing including the seal
plates on respective end surface sides is used for the bearing,
such a non-contact system, in which the seal plates do not come
into contact with the inner ring, makes it possible to prevent
energy loss due to generation of heat and the like due to the
contact, and to prevent deterioration of system efficiency of the
scroll compressor.
[0014] Further, in the scroll compressor according to the present
disclosure, the bearing may be a rolling bearing including a seal
plate on a side surface on side opposite to the seal member side,
and may not include a seal plate on a side surface on the seal
member side.
[0015] The side surface of the bearing on the seal member side
faces the space in which high-pressure working fluid is
sufficiently sealed by the seal member and in which the lubricant
is enclosed. This allows for omission of the seal plate on the seal
member side. On the other hand, a side surface of the bearing on
the side opposite to the seal member faces an inside of the
housing. Therefore, the seal plate is disposed to prevent leakage
of the lubricant.
[0016] Further, in the scroll compressor according to the present
disclosure, the seal member may be an oil seal.
[0017] The lubricant is provided between the oil seal and the
bearing, which makes it possible to reduce wear of the oil
seal.
[0018] Furthermore, the scroll compressor according to the present
disclosure may further include a driving shaft that is rotationally
driven by a driving unit, and the scroll compressor may be
configured as a double rotating scroll compressor that includes a
driving-side scroll member and a driven-side scroll member as the
paired scroll members. The driving-side scroll member is coupled to
the driving shaft and performs rotational movement, and the
driven-side scroll member receives power transmitted from the
driving-side scroll member to perform rotational movement.
[0019] In the double rotating scroll compressor not including a
static scroll member, possibility of wear of the seal member is
remarkable. The wear can be reduced by providing the lubricant
between the seal member and the bearing.
Advantageous Effects of Invention
[0020] It is possible to reduce the axial dimension of the
discharge cylinder rotated around the axis while supplying the
lubricant when the outer peripheral surface of the discharge
cylinder is sealed.
BRIEF DESCRIPTION OF DRAWINGS
[0021] FIG. 1 is a vertical cross-sectional view illustrating a
double rotating scroll compressor according to an embodiment of the
present disclosure.
[0022] FIG. 2 is a vertical cross-sectional view illustrating a
main part of FIG. 1 in an enlarged manner.
[0023] FIG. 3 is a vertical cross-sectional view illustrating a
modification 1.
[0024] FIG. 4 is a vertical cross-sectional view illustrating a
modification 2.
[0025] FIG. 5 is a plan view illustrating a driving-side scroll
member.
DESCRIPTION OF EMBODIMENTS
[0026] An embodiment of the present disclosure is described below
with reference to FIG. 1 and FIG. 2.
[0027] FIG. 1 illustrates a double rotating scroll compressor
(scroll compressor) 1. The double rotating scroll compressor 1 can
be used as, for example, a supercharger that compresses combustion
air (fluid) to be supplied to an internal combustion engine such as
a vehicle engine.
[0028] The double rotating scroll compressor 1 includes a housing
3, a motor (driving unit) 5 accommodated on one end side in the
housing 3, and a driving-side scroll member 70 and a driven-side
scroll member 90 that are accommodated on the other end side in the
housing 3.
[0029] The housing 3 has a substantially cylindrical shape, and
includes a motor accommodation portion (first housing) 3a that
accommodates the motor 5, and a scroll accommodation portion
(second housing) 3b that accommodates the scroll members 70 and
90.
[0030] A cooling fin 3c to cool the motor 5 is provided on an outer
periphery of the motor accommodation portion 3a. A discharge
opening 3d from which compressed air (working fluid) is discharged
is provided at an end part of the scroll accommodation portion 3b.
Note that, although not illustrated in FIG. 1, the housing 3
includes an air suction opening from which air (working fluid) is
sucked in.
[0031] The scroll accommodation portion 3b of the housing 3 is
divided at a division surface P that is located at a substantially
center in an axis direction of the scroll members 70 and 90. The
housing 3 includes a flange portion (not illustrated) that
protrudes outward at a predetermined position in a circumferential
direction. A bolt or the like as a fastening means is inserted into
and fixed to the flange portion, which results in fastening at the
division surface P.
[0032] The motor 5 is driven by being supplied with power from an
unillustrated power supply source. Rotation of the motor 5 is
controlled by an instruction from an unillustrated control unit. A
stator 5a of the motor 5 is fixed to an inner periphery of the
housing 3. A rotor 5b of the motor 5 rotates around a driving-side
rotation axis CL1. A driving shaft 6 that extends on the
driving-side rotation axis CL1 is connected to the rotor 5b. The
driving shaft 6 is connected to a first driving-side shaft portion
7c of the driving-side scroll member 70.
[0033] 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 discharge opening 3d
side.
[0034] The first driving-side scroll portion 71 includes a first
driving-side end plate 71a and first driving-side walls 71b.
[0035] The first driving-side end plate 71a is connected to the
first driving-side shaft portion 7c connected to the driving shaft
6, and extends in a direction orthogonal to the driving-side
rotation axis CL1. The first driving-side shaft portion 7c is
provided so as to be rotatable with respect to the housing 3
through a first driving-side bearing 11 that is a ball bearing.
[0036] The first driving-side end plate 71a has a substantially
disc shape in a planar view. The first driving-side wall 71b formed
in a spiral shape is provided on the first driving-side end plate
71a. The three lines of first driving-side walls 71b are disposed
at an equal interval around the driving-side rotation axis CL1 (see
FIG. 5).
[0037] As illustrated in FIG. 1, the second driving-side scroll
portion 72 includes a second driving-side end plate 72a and second
driving-side walls 72b. The second driving-side walls 72b are each
formed in a spiral shape as with the above-described first
driving-side walls 71b.
[0038] A second driving-side shaft portion (discharge cylinder) 72c
that extends in the driving-side rotation axis CL1 and has a
cylindrical shape 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 through a second
driving-side bearing 14 that is a ball bearing. The second
driving-side end plate 72a includes a discharge port 72d extending
along the driving-side rotation axis CL1.
[0039] A seal member 16 is provided on downstream side of the
second driving-side bearing 14 in a discharge direction of the
compressed air, namely, on front end side that is a free end of the
second driving-side shaft portion 72c, between the second
driving-side shaft portion 72c and the housing 3. The seal member
16 and the second driving-side bearing 14 are disposed at a
predetermined interval in the driving-side rotation axis CL1
direction, and a space R is provided therebetween. A lubricant 17
that is grease as, for example, semi-solid lubricant is enclosed in
the space R.
[0040] The first driving-side scroll portion 71 and the second
driving-side scroll portion 72 are fixed while front ends (free
ends) of the walls 71b and 72b corresponding to each other face
each other. The first driving-side scroll portion 71 and the second
driving-side scroll portion 72 are fixed by bolts (wall fixing
parts) 31 that are fastened to respective flange portions 73
provided at a plurality of positions in the circumferential
direction. The flange portions 73 are provided so as to protrude
outward in a radial direction.
[0041] The driven-side scroll member 90 includes a first
driven-side scroll portion 91 and a second driven-side scroll
portion 92. Driven-side end plates 91a and 92a are located at a
substantially center of the driven-side scroll member 90 in the
axis direction (horizontal direction in figure). The driven-side
end plates 91a and 92a are fixed while rear surfaces (other side
surfaces) of the respective driven-side end plates 91a and 92a are
superimposed and in contact with each other. Although not
illustrated, the fixing is performed by a bolt, a pin, etc. The
through hole 90h is provided at a center of each of the driven-side
end plates 91a and 92a, and causes the compressed air to flow
toward the discharge port 72d.
[0042] The first driven-side walls 91b are provided on one side
surface of the first driven-side end plate 91a, and the second
driven-side walls 92b are provided on one side surface of the
second driven-side end plate 92a. The first driven-side walls 91b
provided on the motor 5 side from the first driven-side end plate
91a engage with the first driving-side walls 71b of the first
driving-side scroll portion 71. The second driven-side walls 92b
provided on the discharge opening 3d side from the second
driven-side end plate 92a engage with the second driving-side walls
72b of the second driving-side scroll portion 72.
[0043] The support members 33 and 35 described later are fixed to
the outer peripheries of the first driven-side walls 91b. The
second driven-side walls 92b also have the similar
configuration.
[0044] The first support member 33 and the second support member 35
are provided at the respective ends of the driven-side scroll
member 90 in the axis direction (horizontal direction in figure).
The first support member 33 is disposed on the motor 5 side, and
the second support member 35 is disposed on the discharge opening
3d side. The first support member 33 is fixed to the front ends
(free ends) of the first driven-side walls 91b, and the second
support member 35 is fixed to the front ends (free ends) of the
second driven-side walls 92b. The shaft portion 33a is provided on
the center axis side of the first support member 33, and the shaft
portion 33a is fixed to the housing 3 through the first support
member bearing 37. The shaft portion 35a is provided on the center
axis side of the second support member 35, and the shaft portion
35a is fixed to the housing 3 through the second support member
bearing 38. As a result, the driven-side scroll member 90 rotates
around the driven-side rotation axis CL2 through the support
members 33 and 35.
[0045] The pin-ring mechanism (synchronous driving mechanism) 15 is
provided between the first support member 33 and the first
driving-side end plate 71a. More specifically, a circular hole is
provided in the first driving-side end plate 71a, and the pin
member 15b is provided on the first support member 33. The pin-ring
mechanism 15 transmits the driving force from the driving-side
scroll member 70 to the driven-side scroll member 90, and causes
the scroll members 70 and 90 to perform rotational movement in the
same direction at the same angular velocity.
[0046] As illustrated in FIG. 2, the scroll accommodation portion
3b includes a second driving-side shaft portion accommodation
portion 3b1 that accommodates the second driving-side shaft portion
72c, and the second driving-side bearing 14 is provided between an
outer peripheral surface X of the second driving-side shaft portion
72c and an inner peripheral surface Y of the second driving-side
shaft portion accommodation portion 3b1.
[0047] The seal member 16 is an oil seal, and a position of the
seal member 16 in the axis direction is regulated by a stopper ring
19 that is fitted in the inner peripheral surface Y of the second
driving-side shaft portion accommodation portion 3b1 as illustrated
in FIG. 2. The seal member 16 includes a seal lip portion 16a made
of a resin. The seal lip portion 16a includes a lip front end part
16a1 that protrudes to the inner peripheral side and comes into
contact with the outer peripheral surface X of the second
driving-side shaft portion 72c. An annular spring 16a2 is provided
on rear-surface side (outer peripheral side) of the seal lip
portion 16a. The lip front end part 16a1 is pressed against the
entire circumference of the outer peripheral surface X of the
second driving-side shaft portion 72c by elastic force of the
spring 16a2.
[0048] The lubricant 17 is enclosed in the space R surrounded by a
surface of the seal member 16 and a surface of the second
driving-side bearing 14 facing each other, namely, a side surface Z
of the seal member 16 and a surface W1 of the second driving-side
bearing 14, the outer peripheral surface X of the second
driving-side shaft portion 72c, and the inner peripheral surface Y
of the second driving-side shaft portion accommodation portion
3b1.
[0049] The double rotating scroll compressor 1 including the
above-described configuration operates in the following manner.
[0050] When the driving shaft 6 rotates around the driving-side
rotation axis CL1 by the motor 5, the first driving-side shaft
portion 7c connected to the driving shaft 6 also rotates, and the
driving-side scroll member 70 accordingly rotates around the
driving-side rotation axis CL1. When the driving-side scroll member
70 rotates, the driving force is transmitted from the support
members 33 and 35 to the driven-side scroll member 90 through the
pin-ring mechanisms 15, and the driven-side scroll member 90
rotates around the driven-side rotation axis CL2. At this time,
when the pin member 15b of the pin-ring mechanism 15 moves while
being in contact with the inner peripheral surface of the circular
hole, the both scroll members 70 and 90 perform rotational movement
in the same direction at the same angular velocity.
[0051] When the scroll members 70 and 90 perform rotational
movement, the air sucked through the air suction opening of the
housing 3 is sucked in from outer peripheral side of each of the
scroll members 70 and 90, and is taken into the compression
chambers formed by the scroll members 70 and 90. Further,
compression is separately performed in the compression chambers
formed by the first driving-side walls 71b and the first
driven-side walls 91b and in the compression chambers formed by the
second driving-side walls 72b and the second driven-side walls 92b.
A volume of each of the compression chambers is reduced as each of
the compression chambers moves toward the center, which compresses
the air. The air compressed by the first driving-side walls 71b and
the first driven-side walls 91b passes through the through holes
90h provided in the driven-side end plates 91a and 92a, and is
joined with the air compressed by the second driving-side walls 72b
and the second driven-side walls 92b. The resultant air passes
through the discharge port 72d and is discharged to outside from
the discharge opening 3d of the housing 3. The discharged
compressed air is guided to an unillustrated internal combustion
engine, and is used as combustion air.
[0052] A high-pressure space HP occupied by the compressed air that
has been discharged from the discharge port 72d but before being
discharged to the outside from the discharge opening 3d and a
low-pressure space LP occupied by sucked air that is sucked from
the suction opening of the housing 3 and is taken in from the outer
peripheral side of the both scroll members 70 and 90 are
partitioned by the seal member 16, the lubricant 17, and the second
driving-side bearing 14.
[0053] The lip front end part 16a1 that is a front end of the seal
lip portion 16a of the seal member 16 is pressed against the outer
peripheral surface X of the second driving-side shaft portion 72c
by the spring 16a2 provided on the seal lip portion 16a, and an oil
film is formed by the lubricant 17 between the lip front end part
16a1 and the outer peripheral surface X of the second driving-side
shaft portion 72c.
[0054] The present embodiment achieves the following action
effects.
[0055] The space R is formed between the seal member 16 and the
second driving-side bearing 14 that rotatably supports the second
driving-side shaft portion 72c, and the lubricant 17 is enclosed in
the space R. Therefore, it is possible to configure the space in
which the lubricant 17 is enclosed, without waste. For example, as
compared with a configuration in which two seal members are
disposed side by side in the axis direction and the lubricant is
enclosed in a space between the seal members, it is possible to
reduce the number of components and to reduce an axial dimension of
the second driving-side shaft portion 72c. Accordingly, the outer
peripheral surface X of the second driving-side shaft portion 72c
can be sealed in compact, which makes it possible to reduce
pressure loss of the compressed air.
[0056] In particular, even in an oilless compressor in which the
air does not contain the lubricant oil, lubrication of the seal
member 16 is achieved by the lubricant 17 enclosed between the seal
member 16 and the second driving-side bearing 14, which allows for
reduction of wear.
[0057] Even when the oilless compressor is used in a case where
clean compressed air containing no oil is desired in a demander of
the compressed air, the scroll compressor 1 according to the
present embodiment can reduce wear of the seal member.
[0058] The present embodiment may be modified in the following
manner.
Modification 1
[0059] As illustrated in FIG. 3, a sealed ball bearing may be used
as the second driving-side bearing 14. A second driving-side
bearing 14' includes seal plates 14d and 14e on respective side
surfaces. The seal plates 14d and 14e prevent leakage of the
lubricant oil inside the second driving-side bearing 14'. Each of
the seal plates 14d and 14e is formed in an annular plate shape,
and a seal plate in which a steel plate is coated with rubber is
suitably used for each of the seal plates 14d and 14e. An outer
periphery of each of the seal plates 14d and 14e is fixed to an
outer ring 14b of the second driving-side bearing 14', and an inner
periphery of each of the seal plates 14d and 14e is separated from
an inner ring 14a so as not to come into contact with the inner
ring 14a.
[0060] As described above, a non-contact configuration in which the
seal plates 14d and 14e do not come into contact with the inner
ring 14a makes it possible to prevent energy loss due to generation
of heat and the like due to the contact, thereby preventing
deterioration of system efficiency of the scroll compressor 1.
Modification 2
[0061] As illustrated in FIG. 4, a second driving-side bearing 14''
may include only the seal plate 14d on side W2 opposite to the seal
member 16 without the seal plate 14e on the seal member side W1
illustrated in FIG. 3.
[0062] A side surface of the bearing 14'' on the seal member side
W1 faces the space R in which the high-pressure air of the
high-pressure space HP is sufficiently sealed by the seal member 16
and in which the lubricant 17 is enclosed. This allows for omission
of the seal plate on the seal member side W1. On the other hand, a
side surface of the bearing 14'' on the side W2 opposite to the
seal member 16 faces the inside of the housing 3. Therefore, the
seal plate 14d is disposed to prevent leakage of the lubricant.
[0063] In the present embodiment, the oil seal is used as the seal
member 16; however, the oil seal may be replaced with a self-seal
packing such as a gasket, a mechanical seal, a piston ring, and an
O-ring. The lubricant 17 can reduce wear at a contact portion
between the seal member 16 that is a self-seal packing such as a
gasket, a mechanical seal, a piston ring, and an O-ring and the
outer peripheral surface X of the second driving-side shaft portion
72c.
[0064] Further, grease that is semi-solid lubricant has been used
as the lubricant 17. Alternatively, lubricant oil that is fluid
lubricant and is represented by mineral oil may be used.
[0065] The above-described scroll compressor 1 may be an "oilless"
or "oil-free" compressor in which the compressed air that has been
compressed in the compression chamber formed by the scroll members
7 and 9 contains no lubricant oil, and the compressed air is
discharged to the outside from the discharge opening 3d through the
discharge port 72d. In the case of the oilless compressor, the seal
member 16 may be worn down because no lubricant oil is contained in
the housing 3 including the high-pressure space HP and the
low-pressure space LP; however, providing the lubricant 17 to the
space between the seal member 16 and the second driving-side
bearing 14 makes it possible to achieve lubrication of the seal
member 16 and to reduce wear of the seal member 16.
[0066] Note that, in the above-described embodiments and
modifications, the double rotating scroll compressor is used as the
supercharger; however, the present disclosure is not limited
thereto. The double rotating scroll compressor is widely used to
compress fluid, and for example, can be used as a refrigerant
compressor used in air conditioner. In addition, the scroll
compressor 1 according to the present disclosure is applicable to
an air brake device using air force, as a brake system for a
railway vehicle.
REFERENCE SIGNS LIST
[0067] 1 Double rotating scroll compressor (scroll compressor)
[0068] 3 Housing [0069] 3a Motor accommodation portion [0070] 3b
Scroll accommodation portion [0071] 3b1 Second driving-side shaft
portion accommodation portion. [0072] 3c Cooling fin [0073] 3d
Discharge opening [0074] 5 Motor (driving unit) [0075] 5a Stator
[0076] 5b Rotor [0077] 6 Driving shaft [0078] 7c First driving-side
shaft portion [0079] 11 First driving-side bearing [0080] 14, 14',
14'' Second driving-side bearing [0081] 14a Inner ring [0082] 14b
Outer ring [0083] 14d Seal plate [0084] 14e Seal plate [0085] 15
Pin-ring mechanism (synchronous driving mechanism) [0086] 15b Pin
member [0087] 16 Seal member (oil seal) [0088] 16a Seal lip portion
[0089] 16a1 Lip front end part [0090] 16a2 Spring [0091] 17
Lubricant (grease) [0092] 31 Bolt (wall fixing part) [0093] 33
First support member [0094] 33a Shaft portion [0095] 35 Second
support member [0096] 35a Shaft portion [0097] 37 First support
member bearing [0098] 38 Second support member bearing [0099] 70
Driving-side scroll member [0100] 71 First driving-side scroll
portion [0101] 71a First driving-side end plate [0102] 71b First
driving-side wall [0103] 72 Second driving-side scroll portion
[0104] 72a Second driving-side end plate [0105] 72b Second
driving-side wall [0106] 72c Second driving-side shaft portion
[0107] 72d Discharge port [0108] 73 Flange portion [0109] 90
Driven-side scroll member [0110] 90h Through hole [0111] 91 First
driven-side scroll portion [0112] 91a First driven-side end plate
[0113] 91b First driven-side wall [0114] 92 Second driven-side
scroll portion [0115] 92a Second driven-side end plate [0116] 92b
Second driven-side wall [0117] CL1 Driving-side rotation axis
[0118] CL2 Driven-side rotation axis [0119] P Division surface
[0120] X Outer peripheral surface of second driving-side shaft
portion [0121] Y Inner peripheral surface of second driving-side
shaft portion accommodation portion [0122] Z Side surface of seal
member [0123] W1 Seal member side of second driving-side bearing
[0124] W2 Side of second driving-side bearing opposite to seal
member [0125] HP High-pressure space [0126] LP Low-pressure space
[0127] R Space
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