U.S. patent application number 15/030611 was filed with the patent office on 2016-09-22 for electric scroll compressor.
This patent application is currently assigned to Valeo Japan Co., Ltd.. The applicant listed for this patent is VALEO JAPAN CO., LTD.. Invention is credited to Hironobu DEGUCHI.
Application Number | 20160273536 15/030611 |
Document ID | / |
Family ID | 52992642 |
Filed Date | 2016-09-22 |
United States Patent
Application |
20160273536 |
Kind Code |
A1 |
DEGUCHI; Hironobu |
September 22, 2016 |
ELECTRIC SCROLL COMPRESSOR
Abstract
[Task] In an electric scroll compressor which includes a housing
member in which a motor fixing portion and an end plate are
integrated with each other, and in which a thrust load of a swing
scroll is supported by the end plate, deformation of the end plate
decreases. [Solution] In an electric scroll compressor in which
stator contact portions 61 which come into contact with a stator 41
of an electric motor 4 and stator non-contact portions 62 which do
not come into contact with the stator are alternately disposed in a
circumferential direction on an inner circumferential wall of a
motor fixing portion 6a, a hole 63 is provided at a position of the
end plate 6b corresponding to each of the stator contact portions
61 in an axial direction, and a disadvantage in which the end plate
6b is deformed due to the motor fixing portion 6a being deformed to
increase the diameter, is prevented. In addition, a reinforcing rib
65 reinforcing the end plate 6b is provided at a position of the
end plate 6b corresponding to each of the stator non-contact
portions 62 in the axial direction, and deformation of the stator
contact portion 61 influencing the end plate 6b via the reinforcing
rib 65 is prevented.
Inventors: |
DEGUCHI; Hironobu; (Saitama,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
VALEO JAPAN CO., LTD. |
Saitama |
|
JP |
|
|
Assignee: |
Valeo Japan Co., Ltd.
Saitama
JP
|
Family ID: |
52992642 |
Appl. No.: |
15/030611 |
Filed: |
September 16, 2014 |
PCT Filed: |
September 16, 2014 |
PCT NO: |
PCT/JP2014/074357 |
371 Date: |
April 20, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H02K 5/161 20130101;
F04C 29/0085 20130101; F04C 18/0261 20130101; F04C 2240/40
20130101; F01C 21/10 20130101; H02K 5/15 20130101; F04C 18/0215
20130101; F04C 29/0057 20130101; F01C 17/06 20130101; F04C 23/02
20130101; F04C 2240/30 20130101 |
International
Class: |
F04C 18/02 20060101
F04C018/02; F04C 29/00 20060101 F04C029/00 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 25, 2013 |
JP |
2013-221734 |
Claims
1. An electric scroll compressor, comprising: a housing member; a
compression mechanism which is accommodated in the housing member ,
and in which a fixing scroll having a substrate and a spiral wall
and a swing scroll having a substrate and a spiral wall mesh with
each other to form a compression chamber; a drive shaft by which
the swing scroll is revolved; a rotation preventing mechanism which
prevents rotation of the swing scroll; and an electric motor which
is accommodated in the housing member and rotates the drive shaft,
wherein the electric motor includes a rotor which is fixed to the
drive shaft and a stator which excites and drives the rotor,
wherein in the housing member, a motor fixing portion to which the
electric motor is fixed, and an end plate which supports an axial
load of the swing scroll and rotatably supports the drive shaft are
integrally formed, wherein stator contact portions which come into
contact with the stator and stator non-contact portions which do
not come into contact with the stator are alternately disposed in a
circumferential direction on an inner circumferential wall of the
motor fixing portion, and wherein a hole, which is formed on a
position corresponding to each of the stator contact portions in an
axial direction and penetrates the end plate in the axial
direction, is provided on the end plate.
2. The electric scroll compressor according to claim 1, wherein a
reinforcing rib, which is formed on a position corresponding to
each of the stator non-contact portions in the axial direction and
reinforces the end plate, is provided on the end plate.
3. The electric scroll compressor according to claim 2, wherein the
hole is a long hole which is long in a circumferential direction of
the end plate.
4. The electric scroll compressor according to claim 3, wherein the
hole is a fluid passage through which a fluid to be compressed,
which is compressed in the compression chamber, flows.
5. The electric scroll compressor according to claim 4, wherein the
rotation preventing mechanism includes a plurality of ring members
which are disposed in a circumferential direction and a plurality
of pins which engage with the ring members, between the substrate
of the swing scroll and the end plate, and wherein each of the ring
members is accommodated in a recessed portion formed on the
substrate of the swing scroll, and each of the pins is fixed to the
end plate.
6. The electric scroll compressor according to claim 4, wherein a
positioning pin which positions the fixing scroll with respect to
the end plate is disposed on the end plate, and the positioning pin
is provided on a virtual circle including the hole.
7. The electric scroll compressor according to any one of claim 5,
wherein a positioning pin which positions the fixing scroll with
respect to the end plate is disposed on the end plate, and the
positioning pin is provided on a virtual circle including the
hole.
8. The electric scroll compressor according to claim 2, wherein the
hole is a fluid passage through which a fluid to be compressed,
which is compressed in the compression chamber, flows.
9. The electric scroll compressor according to claim 8, wherein the
rotation preventing mechanism includes a plurality of ring members
which are disposed in a circumferential direction and a plurality
of pins which engage with the ring members, between the substrate
of the swing scroll and the end plate, and wherein each of the ring
members is accommodated in a recessed portion formed on the
substrate of the swing scroll, and each of the pins is fixed to the
end plate.
10. The electric scroll compressor according to claim 8, wherein a
positioning pin which positions the fixing scroll with respect to
the end plate is disposed on the end plate, and the positioning pin
is provided on a virtual circle including the hole.
11. The electric scroll compressor according to claim 1, wherein
the hole is a long hole which is long in a circumferential
direction of the end plate.
12. The electric scroll compressor according to claim 11, wherein
the hole is a fluid passage through which a fluid to be compressed,
which is compressed in the compression chamber, flows.
13. The electric scroll compressor according to claim 12, wherein
the rotation preventing mechanism includes a plurality of ring
members which are disposed in a circumferential direction and a
plurality of pins which engage with the ring members, between the
substrate of the swing scroll and the end plate, and wherein each
of the ring members is accommodated in a recessed portion formed on
the substrate of the swing scroll, and each of the pins is fixed to
the end plate.
14. The electric scroll compressor according to claim 12, wherein a
positioning pin which positions the fixing scroll with respect to
the end plate is disposed on the end plate, and the positioning pin
is provided on a virtual circle including the hole.
15. The electric scroll compressor according to claim 1, wherein
the hole is a fluid passage through which a fluid to be compressed,
which is compressed in the compression chamber, flows.
16. The electric scroll compressor according to claim 15, wherein
the rotation preventing mechanism includes a plurality of ring
members which are disposed in a circumferential direction and a
plurality of pins which engage with the ring members, between the
substrate of the swing scroll and the end plate, and wherein each
of the ring members is accommodated in a recessed portion formed on
the substrate of the swing scroll, and each of the pins is fixed to
the end plate.
17. The electric scroll compressor according to claim 15, wherein a
positioning pin which positions the fixing scroll with respect to
the end plate is disposed on the end plate, and the positioning pin
is provided on a virtual circle including the hole.
18. The electric scroll compressor according to claim 1, wherein
the rotation preventing mechanism includes a plurality of ring
members which are disposed in a circumferential direction and a
plurality of pins which engage with the ring members, between the
substrate of the swing scroll and the end plate, and wherein each
of the ring members is accommodated in a recessed portion formed on
the substrate of the swing scroll, and each of the pins is fixed to
the end plate.
19. The electric scroll compressor according to claim 1, wherein a
positioning pin which positions the fixing scroll with respect to
the end plate is disposed on the end plate, and the positioning pin
is provided on a virtual circle including the hole.
Description
TECHNICAL FIELD
[0001] The present invention relates to an electric scroll
compressor which is used in a refrigeration cycle of a vehicular
air conditioner, or the like, and particularly, to an electric
scroll compressor, in which a housing member in which an electric
motor is accommodated is configured such that a motor fixing
portion to which the electric motor is fixed and an end plate which
supports an axial load of a swing scroll and rotatably supports a
drive shaft are integrally formed.
BACKGROUND ART
[0002] In the related art, for example, as an electric scroll
compressor, a configuration described in PTL 1 below is known. The
electric scroll compressor includes a discharge housing which
includes a discharge port and in which a compression portion
(compression mechanism) configured such that a fixing scroll member
and a movable scroll member are disposed so as to face each other
is accommodated, a suction housing which includes a suction port,
and an intermediate housing which is interposed between the
discharge housing and the suction housing and in which an electric
motor is accommodated along with the suction housing, in which the
intermediate housing is configured so as to include a motor fixing
portion in which a portion of the electric motor is accommodated
and fixed, and a bearing support portion (end plate) which is
integrally formed on the discharge housing side of the motor fixing
portion, supports a thrust load of a swing scroll, and supports a
drive shaft via a bearing.
CITATION LIST
[0003] Patent Literature
[0004] [PTL 1] JP-A-2000-291557
SUMMARY OF INVENTION
Technical Problem
[0005] In general, since a stator of an electric motor is closely
fitted so as to be fixed to a housing member, in which the electric
motor is accommodated, using pressure-fitting, shrinkage-fitting,
or the like, if a motor fixing portion is deformed such that the
diameter of the motor fixing portion increases due to the
close-fitting of the motor, an end plate which is integrated with
the motor fixing portion is also deformed.
[0006] Since the end plate is a member which supports a thrust load
of a swing scroll, deformation of the end plate makes management of
a thrust gap or contact surface pressure difficult, and there is a
disadvantage that the deformation influences the performance or
reliability of a compressor. Accordingly, if it is not possible to
prevent the deformation of the motor fixing portion due to the
close-fitting of the motor, a configuration in which the
deformation of the end plate is decreased is required.
[0007] The present invention is made in consideration of the
above-described circumstances, and a main object thereof is to
decrease deformation of an end plate in an electric scroll
compressor which includes a housing member in which a motor fixing
portion and an end plate are integrated with each other, and a
thrust load of a swing scroll is supported by the end plate.
Solution to Problem
[0008] In order to achieve the above-described object, there is
provided an electric scroll compressor, including: a housing
member; a compression mechanism which is accommodated in the
housing member, and in which a fixing scroll having a substrate and
a spiral wall and a swing scroll having a substrate and a spiral
wall mesh with each other to form a compression chamber; a drive
shaft by which the swing scroll is revolved; a rotation preventing
mechanism which prevents rotation of the swing scroll; and an
electric motor which is accommodated in the housing member and
rotates the drive shaft, in which the electric motor includes a
rotor which is fixed to the drive shaft and a stator which excites
and drives the rotor, in the housing member, a motor fixing portion
to which the electric motor is fixed, and an end plate which
supports an axial load of the swing scroll and rotatably supports
the drive shaft are integrally formed, stator contact portions
which come into contact with the stator and stator non-contact
portions which do not come into contact with the stator are
alternately disposed in a circumferential direction on an inner
circumferential wall of the motor fixing portion, and a hole, which
is formed at a position corresponding to each of the stator contact
portions in an axial direction and penetrates the end plate in the
axial direction, is provided on the end plate.
[0009] Accordingly, since the hole is formed at the position
corresponding to each of the stator contact portions in the axial
direction, even when the stator contact portions come into contact
with the stator and are deformed to be widened, stress due to
deformation is not easily transmitted to the end plate because of
the hole. Therefore, it is possible to prevent a disadvantage in
which the end plate is deformed due to the motor fixing portion
being deformed so as to increase the diameter.
[0010] In addition, assuming the above-described configuration, a
reinforcing rib reinforcing the end plate may be provided on the
end plate at a position corresponding to each of the stator
non-contact portions in the axial direction.
[0011] In order to increase stiffness of the end plate, providing
the reinforcing rib on the end plate is effective. However, if the
reinforcing rib is formed at the position corresponding to the
stator contact portion in the axial direction, stress due to the
deformation of the stator contact portion is directly transmitted
to the end plate via the reinforcing rib. Accordingly, by forming
the reinforcing rib at the position corresponding to the stator
non-contact portion in the axial direction, it is possible to
prevent the deformation of the stator contact portion from
influencing the end plate via the reinforcing rib.
[0012] Herein, the hole may be a long hole which is long in a
circumferential direction of the end plate. According to this
configuration, the deformation of the motor fixing portion (stator
contact portion) is not easily transmitted to the end plate.
[0013] In addition, the hole may be a fluid passage through which a
fluid to be compressed, which is compressed in the compression
chamber, flows. In this way, since the hole is the passage of the
fluid to be compressed, it is not necessary to form a hole for
preventing deformation in addition to the hole of the fluid
passage.
[0014] Moreover, in the above-described configuration, in a case in
which the rotation preventing mechanism includes a plurality of
ring members which are disposed in a circumferential direction and
a plurality of pins which engage with the ring members, between the
substrate of the swing scroll and the end plate, each of the ring
members may be accommodated in a recessed portion formed on the
substrate of the swing scroll, and each of the pins may be fixed to
the end plate.
[0015] According to this configuration, it is possible to fix the
pins to the end plate in which deformation is prevented and which
has high stiffness, and it is possible to improve the performance
and reliability of the compressor by increasing the accuracy during
assembly of the pins.
[0016] Moreover, a positioning pin which positions the fixing
scroll with respect to the end plate may be disposed on the end
plate, and the positioning pin may be provided on a virtual circle
including the hole.
[0017] From the viewpoint of accurately performing the positioning
between the end plate and the fixing scroll using the positioning
pin, preferably, the pins are provided at locations away from a
shaft center if possible. Meanwhile, the influence (deformation)
due to the pressure-fitting of the motor with respect to the end
plate is decreased on the virtual circle in which the holes are
provided or the portion inside the virtual circle. Accordingly, the
most suitable disposition location of the positioning pin at which
both conditions are satisfied is the location positioned on the
virtual circle including the hole, and if the positioning pin is
provided at this position, it is possible to prevent tilting of the
positioning pin and it is possible to increase positioning
accuracy.
Advantageous Effects of Invention
[0018] As described above, according to the present invention, in
an electric scroll compressor including a housing member, in which
a motor fixing portion to which an electric motor is fixed, and an
end plate which supports an axial load of a swing scroll and
rotatably supports a drive shaft are integrally formed, and in
which stator contact portions which come into contact with a stator
and stator non-contact portions which do not come into contact with
the stator are alternately disposed in a circumferential direction
on an inner circumferential wall of the motor fixing portion, a
hole penetrating in an axial direction is provided at a position of
the end plate corresponding to each of the stator contact portions
in the axial direction. Accordingly, even in a case in which the
stator contact portions are deformed, it is possible to decrease
deformation of the end plate, and it is possible to prevent a
decrease in the performance or reliability of the compressor.
[0019] In addition, in a case in which a reinforcing rib
reinforcing the end plate is formed on the end plate, since the
reinforcing rib is formed at the position corresponding to each of
the stator non-contact portions in the axial direction, it is
possible to prevent the deformation of the stator contact portion
from influencing the end plate via the reinforcing rib.
[0020] In addition, assuming the above-described configuration, a
rotation preventing mechanism includes a plurality of ring members
which are disposed in a circumferential direction and a plurality
of pins which engage with the ring members, between a substrate of
the swing scroll and the end plate, and each of the ring members is
accommodated in a recessed portion formed on the substrate of the
swing scroll, and each of the pins is fixed to the end plate.
Accordingly, since the pins are fixed to the portions at which
deformation is suppressed, the accuracy during assembly of the pins
increases and it is possible to improve the performance or
reliability of the compressor.
[0021] In addition, since a positioning pin which positions the
fixing scroll is provided on a virtual circle including the hole of
the end plate, it is possible to increase positioning accuracy
while preventing tilting of the positioning pin.
BRIEF DESCRIPTION OF DRAWINGS
[0022] FIG. 1 is a section view showing an electric scroll
compressor according to the present invention.
[0023] FIG. 2A is a rear view of a swing scroll.
[0024] FIG. 2B is sectional view of a swing scroll taken along line
A-A of FIG. 2A.
[0025] FIG. 3A is a view showing a housing member into which an end
plate is integrated, when viewed in an axial direction from a motor
fixing portion side.
[0026] FIG. 3B is a view showing a housing member into which an end
plate is integrated, when viewed in the axial direction from a
compression mechanism side.
[0027] FIG. 4 is a side sectional view showing the housing member
into which the end plate is integrated.
[0028] FIG. 5 is a partially cut perspective view showing the
housing member into which the end plate is integrated.
DESCRIPTION OF EMBODIMENTS
[0029] Hereinafter, an electric scroll compressor according to the
present invention will be described with reference to the
drawings.
[0030] In FIG. 1, an electric scroll compressor 1 is an electric
compressor suitable for a refrigeration cycle which has a
refrigerant as a working fluid, and in a housing 2 formed of
aluminum alloy, a compression mechanism 3 is disposed on the right
side of the drawing, and an electric motor 4 which drives the
compression mechanism 3 is disposed on the left side of the
drawing. In addition, in FIG. 1, the left side of the drawing is
referred to as a front side of the compressor 1, and the right side
of the drawing is referred to as a rear side of the compressor
1.
[0031] The housing 2 includes a compression mechanism accommodation
housing member 5 in which the compression mechanism 3 is
accommodated, a motor accommodation housing member 6 in which the
electric motor 4 driving the compression mechanism 3 is
accommodated, and an inverter accommodation housing member 7 in
which an inverter device (not shown) which drives and controls the
electric motor 4 is accommodated, and the housing members are
positioned by positioning pins (not shown) and fastened in an axial
direction by fastening bolts 8 and 9.
[0032] The compression mechanism accommodation housing member 5
fixes a fixing scroll of the compression mechanism described below,
and is formed in a bottomed tubular shape in which a side facing
the motor accommodation housing member is opened. In the motor
accommodation housing member 6, a tubular motor fixing portion 6a
to which the electric motor is fixed, and an end plate 6b are
integrally formed with each other, and the end plate 6b is provided
on a side facing the compression mechanism accommodation housing
member 5 and supports an axial load of a swing scroll 22 of the
compression mechanism 3 described below, and a shaft support
portion 10 is integrally provided with the end plate 6b. In
addition, in the inverter accommodation housing member 7, an
inverter accommodation portion 7a, which is formed in a tubular
shape, and an end plate 7b in which a shaft support portion 11 is
integrally formed on a side facing the motor accommodation housing
member 6, are integrally provided.
[0033] In addition, a drive shaft 14 is rotatably supported by the
shaft support portion 10 of the end plate 6b of the motor
accommodation housing member 6 and the shaft support portion 11 of
the end plate 7b of the inverter accommodation housing member 7 via
bearings 12 and 13. The inner portion of the housing 2 is divided
into a compression mechanism accommodation portion 15a in which the
compression mechanism 3 is accommodated, a motor accommodation
portion 15b in which the electric motor 4 is accommodated, and an
inverter accommodation portion 15c in which the inverter device is
accommodated, from the rear side by the end plates 6b and 7b which
are formed in the motor accommodation housing member 6 and the
inverter accommodation housing member 7.
[0034] Moreover, in this example, the inverter accommodation
portion 15c is defined by fixing a cover 16 to the inverter
accommodation housing member 7 using a bolt (not shown) or the
like.
[0035] The compression mechanism 3 is a scroll type mechanism which
includes a fixing scroll 21 and the swing scroll 22 which is
disposed so as to face the fixing scroll, movement in the axial
direction of the fixing scroll 21 with respect to the housing 2
(compression mechanism accommodation housing member 5) is allowed,
and movement in a radial direction of the fixing scroll 21 is
regulated by positioning pins 23 described below. The fixing scroll
21 is configured of a disk-shaped substrate 21a, a cylindrical
outer circumferential wall 21b which is provided over the entire
circumference along the outer edge of the substrate 21a and is
erected toward the front side, and a spiral wall 21c having a
spiral shape which extends toward the front side from the substrate
21a inside the outer circumferential wall 21b.
[0036] Moreover, also as shown in FIGS. 2A and 2B, the swing scroll
22 is configured of a disk-shaped substrate 22a and a spiral wall
22c having a spiral shape which is erected toward the rear side
from the substrate 22a, an eccentric shaft 25, which is provided on
the rear end portion of the drive shaft 14 and is eccentrically
provided with respect to the shaft center of the drive shaft 14, is
supported via a radial bearing 27 by a fitting recessed portion 24
which is provided at the center on the rear surface of the
substrate 22a, and the swing scroll 22 is provided so as to revolve
about the shaft center of the drive shaft 14.
[0037] In the fixing scroll 21 and the swing scroll 22, the spiral
walls 21c and 22c mesh with each other, and a compression chamber
26 is defined by a space which is surrounded by the substrate 21a
and the spiral wall 21c of the fixing scroll 21 and the substrate
22a and the spiral wall 22c of the swing scroll 22.
[0038] Moreover, positions in the radial direction of the fixing
scroll 21 and the end plate 6b of the motor accommodation housing
member 6 are regulated by the positioning pins 23.
[0039] In addition, in this example, the fixing scroll 21 is
directly assembled to the end plate 6b of the motor accommodation
housing member 6 and the axial load of the swing scroll 22 is
directly supported by the end plate 6b. However, an annular thrust
race having a thin plate shape may be interposed between the outer
circumferential wall 21b of the fixing scroll 21 and the end plate
6b, the fixing scroll 21 and the end plate 6b may be abutted
against each other via the thrust race, and the axial load of the
swing scroll 22 may be also supported by the end plate via the
thrust race.
[0040] The shaft support portion 10 which is integrally formed with
the end plate 6b of the motor accommodation housing member 6 has a
through hole 10a at the center, and in the shaft support portion
10, a bearing accommodation portion 31 in which the bearing 12 is
accommodated and a weight accommodation portion 33 in which a
balance weight 32 which is rotated so as to be integrated with the
drive shaft 14 is accommodated are formed in this order from the
front side farthest from the swing scroll 22.
[0041] A suction chamber 35, into which a refrigerant introduced
from a suction port 38 described below is sucked via a suction
passage 45, is formed between the outer circumferential wall 21b of
the above-described fixing scroll 21 and the outermost
circumferential portion of the spiral wall 22c of the swing scroll
22, and a discharge chamber 37, to which refrigerant gas compressed
in the compression chamber 26 is discharged via a discharge hole 36
formed at approximately the center of the fixing scroll 21, is
formed between the rear side of the fixing scroll 21 in the housing
and the rear end wall of the compression mechanism accommodation
housing member 5. The refrigerant gas which is discharged to the
discharge chamber 37 is pressure-fed to an external refrigerant
circuit via a discharge port 39.
[0042] A stator 41 and a rotor 42 configuring the electric motor 4
are accommodated in the motor fixing portion 6a which is formed on
the front side of the end plate 6b of the motor accommodation
housing member 6. The stator 41 is configured of an iron core which
is cylindrically formed and a coil which is wound around the iron
core, and is fixed to the inner surface of the housing 2 (motor
accommodation housing member 6). In addition, the rotor 42, which
is configured of a magnet rotatably accommodated inside the stator
41, is mounted so as to be fixed to the drive shaft 14, and the
rotor 42 is rotated by a rotation magnetic force formed by the
stator 41 so as to rotate the drive shaft 14.
[0043] In addition, the inverter device accommodated in the
inverter accommodation housing member 7 is electrically connected
to the stator 41 via a terminal (an airtight terminal) attached to
a through hole (not shown) formed on the end plate 7b, and power is
supplied from the inverter device to the electric motor 4.
[0044] The suction port 38, through which the refrigerant gas is
sucked to the motor accommodation portion 15b, is formed on the
side surface of the housing 2 (motor accommodation housing member
6), and the suction passage 45, through which the refrigerant
flowing from the suction port 38 into the motor accommodation
portion 15b is introduced to the suction chamber 35, is configured
via a gap between the stator 41 and the housing 2 (motor
accommodation housing member 6), holes 63 formed on the end plate
6b, a gap formed between the fixing scroll 21 and the housing 2, or
the like.
[0045] As shown in FIGS. 3A to 5, stator contact portions 61 which
come into contact with the stator 41 and stator non-contact
portions 62 which do not come into contact with the stator are
alternately formed on the inner circumferential surface of the
motor accommodation housing member 6 in the circumferential
direction. The stator contact portions 61 and the stator
non-contact portions 62 are formed so as to extend in the axial
direction, and the stator 41 is fixed to the housing (motor
accommodation housing member 6) by tightly fitting the outer
circumferential portion of the stator 41 to the stator contact
portions 61 by pressure-fitting, shrinkage-fitting, or the like.
Accordingly, the gap between the stator 41 and the housing 2 (motor
accommodation housing member 6) configuring a portion of the
suction passage 45 is formed by gaps between the inner walls of the
stator non-contact portions 62 and the outer circumferential
portion of the stator 41.
[0046] In this example, six stator non-contact portions 62 and six
stator contact portions 61 are formed with intervals of
approximately 60.degree. in a center angle in the circumferential
direction, and in this example, widths of the stator contact
portions 61 in the circumferential direction are relatively smaller
than widths of the stator non-contact portions 62 in the
circumferential direction (the width of each of the stator contact
portions 61 is formed so as to have approximately 20.degree., and
the width of each of the stator non-contact portions 62 is formed
so as to have approximately 40.degree. in a circumferential
angle).
[0047] In addition, the holes 63 which communicate with the motor
accommodation portion 15b and the compression mechanism
accommodation portion 15a are formed on the end plate 6b of the
motor accommodation housing member 6, and the refrigerant flowing
from the suction port 38 into the motor accommodation portion 15b
is introduced into the suction chamber 35 via the holes 63.
[0048] The holes 63 are formed on the outside in the radial
direction from pins 51 of the rotation preventing mechanism
described below. The plurality of holes 63 are formed in the
circumferential direction at positions corresponding to the stator
contact portions 61 in the axial direction, that is, positions
approximately overlapping with the stator contact portions 61 in
the circumferential direction (positions having approximately the
same phases), and in this example, the holes 63 are formed in long
holes extending in the circumferential direction and are formed at
positions (five locations) corresponding to all remaining stator
contact portions except for one position corresponding to one
stator contact portion.
[0049] In addition, reference numeral 64 indicates bolt holes into
which the bolts 9 are inserted.
[0050] Moreover, in this example, reinforcing ribs 65, which
reinforce the end plate 6b from the shaft support portion 10 to the
inner circumferential surface of the motor fixing portion 6a,
integrally extend in the radial direction on the surface of the
motor accommodation portion side of the end plate 6b. The plurality
of reinforcing ribs 65 are formed with approximately equal
intervals in the circumferential direction at positions
corresponding to the stator non-contact portions 62 in the axial
direction, that is, positions approximately overlapping with the
stator non-contact portions 62 in the circumferential direction
(positions having approximately the same phases), and in this
example, the reinforcing ribs 65 are provided at six locations in
the circumferential direction in accordance with the number of the
pins 51 described below. Accordingly, the reinforcing ribs 65 are
formed so as not to overlap the positions of the stator contact
portions 61 in the circumferential direction (so as not to have the
same phase), and stress due to deformation of the stator contact
portions 61 is not directly transmitted to the reinforcing ribs
65.
[0051] In addition, as shown in FIG. 3B, the positioning pins 23
which position the fixing scroll 21 with respect to the end plate
6b are provided on a virtual circle a including the holes 63, and
the positioning pins 23 are pressure-fitted to pin attachment holes
55 formed on the end plate 6b so as to be fixed to the end plate
6b.
[0052] In the above-described configuration, when the rotor 42
rotates and the drive shaft 14 rotates, in the compression
mechanism 3, the swing scroll 22 is driven via the eccentric shaft
25 so as to revolve.
[0053] Accordingly, the refrigerant, which is sucked from the
suction port 38 to the motor accommodation portion 15b, is
introduced into the suction chamber 35 via the holes 63 of the end
plate 6b through the gaps between the stator non-contact portions
62 and the stator 41 around the rotor or the gap between the coils
of the stator 41.
[0054] Since the compression chamber 26 of the compression
mechanism moves while the volume of the compression chamber 26 is
gradually decreased from the outer circumferential sides of the
spiral walls 21c and 22c of both scrolls to the center sides by the
revolution of the swing scroll 22, the refrigerant gas sucked from
the suction chamber 35 to the compression chamber 26 is compressed,
and the compressed refrigerant gas is discharged to the discharge
chamber 37 via the discharge hole 36 formed on the substrate 21a of
the fixing scroll 21 and is sent to the external refrigerant
circuit via the discharge port 39.
[0055] However, in the above-described electric scroll compressor
1, since a rotation force is generated in the swing scroll 22 due
to the rotation of the drive shaft 14, it is necessary to revolve
the swing scroll 22 around the shaft center of the drive shaft 14
while regulating the rotation of the swing scroll 22. Accordingly,
in the present compressor, the rotation preventing mechanism in
which the pins 51 are engaged is provided between the substrate 22a
of the swing scroll 22 and the end plate 6b of the motor
accommodation housing member 6.
[0056] In this example, for example, the rotation preventing
mechanism, in which the pins 51 are engaged, adopts a pin and ring
coupling, and is configured of the plurality of pins 51 which are
disposed in the circumferential direction, a plurality of ring
members 52 which engage with the pins 51, and a plurality of
cylindrical recessed portions 53 in which the ring members 52 are
accommodated.
[0057] As shown in FIGS. 1, 2A and 2B, the cylindrical recessed
portions 53 are configured so as to form recesses having circular
cross-sections on the rear surface of the substrate 22a of the
swing scroll 22, and are formed with equal intervals (in this
example, an interval of 60.degree.) around the fitting recessed
portion 24 of the swing scroll 22. Each of the ring members 52 is
formed of iron and has a ring shape, and has a smaller outer
diameter than an inner diameter of each of the cylindrical recessed
portions 53 so as to be loosely fitted to the cylindrical recessed
portion 53. A thickness of the ring member 52 in the axial
direction is substantially the same as a width of the cylindrical
recessed portion 53 in the axial direction, or is smaller than the
width of the cylindrical recessed portion 53.
[0058] Each of the pins 51 is formed of iron and has a columnar
shape, and is formed so as to have a smaller outer diameter than
the inner diameter of the ring member 52. The pins 51 are fixed
with equal intervals around the weight accommodation portion 33 of
the end plate 6b of the motor accommodation housing member 6 in
accordance with the positions of the cylindrical recessed portions
53. In this example, the pins 51 are pressure-fitted to pin
attachment holes 54 formed on the end plate 6b so as to be fixed to
the end plate 6b, and are fixed to the rear surface of the portions
on which the reinforcing ribs 65 of the end plate 6b are
formed.
[0059] Accordingly, even when the rotation force is generated in
the swing scroll 22 due to the rotation of the drive shaft 14, the
pins 51 fixed to the end plate 6b come into contact with the inner
circumferential surfaces of the ring members 52, the pins 51 engage
with the cylindrical recessed portions 53 via the ring members, and
the movement of the swing scroll is regulated. Therefore, in the
swing scroll 22, only the revolution of the swing scroll 22 with
respect to the shaft center of the drive shaft 14 is admitted while
the rotation of the swing scroll 22 is regulated.
[0060] In addition, in the above-described configuration in which
the pin and ring coupling is used as the rotation preventing
mechanism, since the cylindrical recessed portions are formed on
the substrate of the swing scroll, it is possible to decrease
weight of the swing scroll 22 which is a movable member, and it is
possible to improve drivability of the swing scroll 22. In
addition, since the pins 51 are pressure-fitted and fixed to the
end plate 6b of the motor accommodation housing member 6 which is a
fixing member having higher stiffness than that of the substrate
22a of the swing scroll 22, deformation of the end plate 6b is
little generated during pressure-fitting of the pins 51. Moreover,
even in the case in which the pins 51 engage with the cylindrical
recessed portions 53 via the ring members 52 and receive the radial
load, the locations of the cylindrical recessed portions 53 to
which the pins 51 are pressure-fitted are not deformed by the
radial load, and it is possible to increase accuracy during
assembly of the pins 51 (it is possible to prevent tilting of the
pins).
[0061] In addition, in the above-described configuration, since the
holes 63 are formed on the outside in the radial direction from the
locations of the pins 51 fixed to the end plate 6b, even in a case
where the motor fixing portion 6a is pressed and widened when the
stator 41 of the electric motor is tightly fitted to the motor
fixing portion 6a (the stator contact portions 61) of the motor
accommodation housing member 6, deformation of the end plate 6b is
prevented by the holes 63, and it is possible to prevent
deformation at the locations of the fixed pins 51. Particularly, in
the present embodiment, in the case where the holes 63 formed on
the end plate 6b are formed in the long holes extending in the
circumferential direction and are formed at the positions
corresponding to the stator contact portions 61 in the axial
direction, it is possible to reliably prevent transmission of
stress from the stator contact portions 61, at which deformation of
the motor fixing portion 6a is most significantly generated, by the
holes, and it is possible to more effectively prevent deformation
of the end plate 6b (deformation at the locations of the fixed
pins).
[0062] Moreover, in the above-described configuration, since the
pins 51 are fixed to the portions at which the reinforcing ribs 65
provided on the end plate 6b are formed, the pins 51 are fixed to
the locations having higher stiffness in the end plate 6b, and it
is more reliably prevent the deformation at the locations to which
the pins 51 are pressure-fitted when the pins 51 are
pressure-fitted so as to be fixed or when the pins 51 receive the
radial load.
[0063] Moreover, since the reinforcing ribs 65 are formed at the
positions corresponding to the stator non-contact portions 62 in
the axial direction, it is possible to prevent the stress due to
the deformation of the stator contact portions 61 from being
transmitted to the end plate 6b via the reinforcing ribs 65.
[0064] Moreover, in the above-described configuration, since the
positioning pins 23 which position the end plate 6b and the fixing
scroll 21 are provided on the virtual circle including the holes
63, it is possible to satisfy a demand of providing the positioning
pins 23 at locations away from the shaft center if possible to
secure positioning accuracy between the end plate 6b and the fixing
scroll 21, and a demand of suppressing influences (deformation) of
the end plate 6b due to the pressure-fitting (tightly fitting) of
the electric motor 4 with respect to the motor accommodation
housing member 6, and it is possible to secure accuracy during
assembly of the positioning pins 23 while securing positioning
accuracy of the fixing scroll 21.
[0065] Moreover, in the above-described configuration example, the
example is exemplified in which the cylindrical recessed portions
53 engage with the pins 51 via the ring members 52. However, in
order to secure a rotation prevention function, it is also possible
to omit the ring member 52, and in this case, the cylindrical
recessed portions 53 may directly engage with the pins 52. Also in
this configuration, effects similar to those of the above-described
configuration example can be obtained.
REFERENCE SIGNS LIST
[0066] 1: electric scroll compressor
[0067] 2: housing
[0068] 3: compression mechanism
[0069] 4: electric motor
[0070] 6: motor accommodation housing member
[0071] 6a: motor fixing portion
[0072] 6b: end plate
[0073] 14: drive shaft
[0074] 21: fixing scroll
[0075] 21a: substrate
[0076] 21c: spiral wall
[0077] 22: swing scroll
[0078] 22a: substrate
[0079] 22c: spiral wall
[0080] 23: positioning pin
[0081] 26: compression chamber
[0082] 51: pin
[0083] 52: ring member
[0084] 53: cylindrical recessed portion
[0085] 61: stator contact portion
[0086] 62: stator non-contact portion
[0087] 63: hole
[0088] 65: reinforcing rib
* * * * *