CN116412133A

CN116412133A - Scroll compressor and sleeve for scroll compressor

Info

Publication number: CN116412133A
Application number: CN202111683036.0A
Authority: CN
Inventors: 孙玉松
Original assignee: Danfoss Tianjin Ltd
Current assignee: Danfoss Tianjin Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2023-07-11

Abstract

Embodiments of the present invention disclose a sleeve for a scroll compressor and a scroll compressor. The scroll compressor includes a first scroll, a second scroll, a bracket, a motor, a drive member, and a sleeve. The driving member is rotatably mounted to the bracket, the motor drives the first scroll to rotate through the driving member and the first scroll drives the second scroll to rotate, the driving member comprises a hub part with an inner hole, the hub part comprises a first end part, a second end part and a flange part which radially outwards extends from the first end part of the hub part of the driving member, the inner hole of the hub part is provided with an inner hole part positioned at the first end part, and the hub part is provided with a first fixing part arranged on the hole wall of the inner hole part. A sleeve is disposed in the inner bore portion of the hub, and the sleeve includes: the second fixing part of the sleeve is matched with the first fixing part of the hub part. The scroll compressor according to the present invention is compact, small in size and light in weight.

Description

Scroll compressor and sleeve for scroll compressor

Technical Field

Embodiments of the present invention relate to a scroll compressor and a sleeve for the scroll compressor.

Background

A conventional scroll compressor includes a fixed scroll and an orbiting scroll. The fixed scroll has an end plate and a fixed scroll wrap extending from the end plate. The orbiting scroll has an end plate and an orbiting scroll wrap extending from the end plate thereof, the orbiting scroll wrap and the fixed scroll wrap cooperating to form a compression chamber for compressing a medium. The motor drives the orbiting scroll through the drive shaft to compress a medium in the compression chamber.

Disclosure of Invention

It is an object of embodiments of the present invention to provide a scroll compressor and a sleeve for a scroll compressor, whereby for example the performance of the scroll compressor may be improved.

An embodiment of the present invention provides a scroll compressor including: a first scroll including a first end plate and a first scroll wrap extending from the first end plate in a first direction; a second scroll including a second end plate and a second scroll wrap extending from the second end plate in a second direction opposite the first direction, the second scroll wrap and the first scroll wrap cooperating to form a compression chamber for a compression medium; the bracket is positioned on one side of the second vortex plate, which is far away from the first vortex plate; a motor; the driving piece, the driving piece rotationally installs in the support and is located the one side of keeping away from first vortex dish of second vortex dish, and the motor passes through the rotation of driving piece drive first vortex dish, and first vortex dish drive second vortex dish is rotatory, and the driving piece includes: a hub having an inner bore, the hub including opposed first and second ends; and a flange portion extending radially outwardly from a first end of the hub portion of the driver, the inner bore of the hub portion having an inner bore portion at the first end, the hub portion having a first securing portion disposed on a wall of the inner bore portion; and a sleeve disposed in the inner bore portion of the hub, the sleeve comprising: the second fixing part of the sleeve is matched with the first fixing part of the hub part.

According to an embodiment of the invention, the sleeve is in clearance fit with the inner bore portion of the hub; or the sleeve may be an interference fit with the inner bore portion of the hub.

According to an embodiment of the present invention, one of the first fixing portion and the second fixing portion includes a recess, and the other of the first fixing portion and the second fixing portion includes a protrusion fitted in the recess.

According to an embodiment of the present invention, the second fixing portion includes a radial protrusion protruding radially outward from the outer peripheral surface of the cylindrical body, and the first fixing portion includes a radial recess on the wall of the inner hole portion, the radial protrusion being fitted in the radial recess.

According to an embodiment of the invention, the radial recess of the sleeve body is a plurality of circumferentially spaced radial recesses and the radial projection is a plurality of circumferentially spaced radial projections respectively fitted in the plurality of radial recesses.

According to an embodiment of the invention, the radial protrusion has a radially outward facing surface, the radially protruding surface is convex, and the radial recess has a radially inward facing surface, the surface of the radial recess is concave.

According to an embodiment of the present invention, the radial protrusion is wedge-shaped in the axial direction such that the radial dimension of the radial protrusion becomes smaller in the direction from the first end to the second end of the cylindrical body, and the radial recess is wedge-shaped in the axial direction such that the radial dimension of the radial recess becomes smaller in the direction from the first end to the second end of the hub.

According to an embodiment of the invention, the radial protrusion has a radially outwardly facing surface, which is a roughened surface.

According to an embodiment of the invention, the radial protrusion extends from the first end of the cylindrical body to between the first end and the second end of the cylindrical body, and an end of the radial protrusion facing the second end of the cylindrical body abuts an end of the radial recess facing the second end of the hub.

According to an embodiment of the present invention, the second fixing portion includes an axial protrusion protruding axially outward from an end face of the second end portion of the cylindrical body, and the hole wall of the inner hole portion of the hub portion has a fixing step having a stepped face directed in a direction from the second end portion to the first end portion of the hub portion, the first fixing portion includes an axial recess on the fixing step, and the axial protrusion is fitted in the axial recess.

According to an embodiment of the present invention, the axial recess is a plurality of circumferentially spaced axial recesses and the axial projection is a plurality of circumferentially spaced axial projections respectively fitted in the plurality of axial recesses.

According to an embodiment of the invention, the axial projection has a radially outward facing surface, the axially projecting surface is convex, and the axial recess has a radially inward facing surface, the surface of the axial recess is concave.

According to an embodiment of the invention, the axial projection is axially wedge-shaped such that the axial projection tapers in an axially outward direction from the end face of the second end of the tubular body, and the axial recess is axially wedge-shaped such that the axial recess tapers in a direction from the first end to the second end of the hub.

According to an embodiment of the invention, the sleeve further comprises a bearing bushing, which is arranged within the cylindrical body.

According to an embodiment of the invention, the bearing bushing has two circumferential ends abutting in the circumferential direction.

According to an embodiment of the invention, the bearing bush is interference fit with the cylindrical body.

According to an embodiment of the invention, the bearing bush and the cylindrical body are made of the same material, such as an aluminum alloy.

According to an embodiment of the invention, the bearing bushing is made of a different material than the cylindrical body, e.g. the bearing bushing is made of PTFE and the cylindrical body is made of steel.

According to an embodiment of the invention, the bearing bushing is made of a single material, such as an aluminum alloy.

According to an embodiment of the invention, the bearing bush is made of a composite material, for example comprising, in order from the innermost side to the outermost side of the bearing bush: PTFE layer, copper layer and steel layer; or a carbon layer and a steel layer.

According to an embodiment of the present invention, the hardness of the cylindrical body is greater than or equal to 30HRC.

According to an embodiment of the invention, the cylindrical body is made of cast iron, powder metallurgy, alloy, steel or polymeric material.

According to an embodiment of the present invention, the scroll compressor further includes: and a stationary shaft fixed to the bracket, wherein the driving member is rotatably mounted to the bracket by being rotatably mounted to the stationary shaft via a hub portion of the driving member, and wherein the hub portion of the driving member is mounted to the stationary shaft via a sleeve at a first end.

According to an embodiment of the present invention, the cylindrical body has a notch recessed axially inward from an end face of the first end portion for lubricating oil to flow from an inner side of the cylindrical body to an outer side of the cylindrical body.

According to an embodiment of the invention, the motor is an axial flux motor, and comprises a stator and a rotor, wherein the stator is fixed on the bracket, and the rotor is fixedly connected with the driving piece and used for driving the driving piece to rotate so as to drive the first vortex plate to rotate.

Embodiments of the present invention also provide a sleeve for a scroll compressor, comprising: the fixing part is arranged on the tubular main body and is used for being matched and connected with other components.

According to an embodiment of the invention, the fixing portion comprises a recess or a protrusion.

According to an embodiment of the present invention, the fixing portion includes a radial protrusion protruding radially outward from the outer peripheral surface of the cylindrical body.

According to an embodiment of the invention, the radial projections are a plurality of circumferentially spaced radial projections.

According to an embodiment of the present invention, the plurality of radial protrusions are equally spaced circumferentially.

According to an embodiment of the invention, the radial projection has a radially outwardly facing surface, which is convex.

According to an embodiment of the present invention, the radial protrusion is wedge-shaped in the axial direction such that the radial protrusion becomes gradually smaller in size in the radial direction in the direction from the first end portion to the second end portion of the cylindrical body.

According to an embodiment of the invention, the radial protrusion extends from the first end of the cylindrical body to between the first end and the second end of the cylindrical body.

According to an embodiment of the present invention, the fixing portion includes a recess recessed radially inward from an outer peripheral surface of the cylindrical body.

According to an embodiment of the invention, the radial recess is a plurality of circumferentially spaced radial recesses.

According to an embodiment of the present invention, the plurality of radial recesses are equally spaced circumferentially.

According to an embodiment of the present invention, the fixing portion includes an axial protrusion protruding axially outward from an end face of the second end portion of the cylindrical body.

According to an embodiment of the invention, the axial projections are a plurality of circumferentially spaced axial projections.

According to an embodiment of the present invention, the plurality of axial protrusions are equally spaced circumferentially.

According to an embodiment of the invention, the axial projection has a radially outwardly facing surface, which is convex.

According to an embodiment of the invention, the axial projection is wedge-shaped in the axial direction such that the axial projection tapers in a direction axially outwards from the end face of the second end of the tubular body.

According to an embodiment of the invention, the fixing portion includes an axial recess recessed axially inward from an end face of the second end of the cylindrical body.

According to an embodiment of the invention, the axial recess is a plurality of circumferentially spaced axial recesses.

According to an embodiment of the present invention, the plurality of axial recesses are equally spaced in the circumferential direction.

According to an embodiment of the invention, the sleeve further comprises: and a bearing bush disposed in the cylindrical body.

According to an embodiment of the invention, the bearing bush is made of the same material as the cylindrical body, such as aluminium.

For example, the scroll compressor according to the embodiment of the present invention may improve performance of the scroll compressor, for example.

Drawings

FIG. 1 is a schematic cross-sectional view of a scroll compressor according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of a first scroll of the scroll compressor shown in FIG. 1;

FIG. 3 is a schematic perspective view of a second scroll of the scroll compressor shown in FIG. 1;

FIG. 4 is a schematic perspective view of a drive member of the scroll compressor shown in FIG. 1;

fig. 5 is a schematic perspective view of a driving member of a scroll compressor according to a modification of the embodiment of the present invention;

FIG. 6 is a schematic perspective view of a drive member of the scroll compressor shown in FIG. 4;

FIG. 7 is a schematic top view of a drive of the scroll compressor shown in FIG. 4;

FIG. 8 is a schematic top view of a drive of a scroll compressor according to a variation of an embodiment of the present invention;

FIG. 9 is a schematic cross-sectional view of the drive member of the scroll compressor shown in FIG. 8, taken along line AA in FIG. 8;

FIG. 10 is a schematic cross-sectional view of the drive member of the scroll compressor shown in FIG. 8, taken along line DD in FIG. 8;

fig. 11 is a schematic cross-sectional view of a driving member of the scroll compressor shown in fig. 8 along line EE in fig. 8;

FIG. 12 is a schematic cross-sectional view of a drive member of the scroll compressor shown in FIG. 8, taken along line FF in FIG. 8;

FIG. 13 is a schematic cross-sectional view of the drive member of the scroll compressor shown in FIG. 8, taken along line GG in FIG. 8;

FIG. 14 is a schematic top view of a drive of a scroll compressor according to another variation of the embodiment of the present invention;

fig. 15 is a schematic cross-sectional view of a driving member of the scroll compressor shown in fig. 14, taken along the line JJ in fig. 14;

fig. 16 is a schematic cross-sectional view of a driving member of a scroll compressor according to still another modification of the embodiment of the present invention;

fig. 17 is a schematic cross-sectional view of a driving member of a scroll compressor according to still another modification of the embodiment of the present invention;

FIG. 18 is a schematic perspective view of a sleeve of a drive member of the scroll compressor shown in FIG. 1;

FIG. 19 is another schematic perspective view of a sleeve of a drive member of the scroll compressor shown in FIG. 18;

fig. 20 is a schematic cross-sectional view of the scroll compressor shown in fig. 1 in an assembled state of a driving member, a second scroll, a fixed shaft, an oil applying bolt, etc.;

FIG. 21 is a schematic perspective view of a bearing bushing of a sleeve of a drive of the scroll compressor shown in FIG. 1;

fig. 22 is a schematic perspective view of a sleeve of a driving member of a scroll compressor according to a modification of the embodiment of the present invention;

FIG. 23 is another schematic perspective view of a sleeve of a drive member of the scroll compressor shown in FIG. 22;

FIG. 24 is a schematic cross-sectional view of the scroll compressor shown in FIG. 1 in an assembled state with a drive member, stationary shaft, sleeve, etc.;

FIG. 25 is a schematic exploded perspective view of a drive member, stationary shaft, sleeve, etc. of the scroll compressor shown in FIG. 24;

FIG. 26 is a schematic exploded cross-sectional view of a drive member, stationary shaft, sleeve, etc. of the scroll compressor illustrated in FIG. 24;

fig. 27 is a schematic cross-sectional view of a driving member, a first scroll, a second scroll, a fixed shaft, etc. of the scroll compressor shown in fig. 1;

fig. 28 is a schematic exploded cross-sectional perspective view of a driving member, a first scroll, a second scroll, a fixed shaft, etc. of the scroll compressor shown in fig. 27;

FIG. 29 is a schematic perspective view of a bracket of the scroll compressor shown in FIG. 1;

FIG. 30 is a schematic cross-sectional view of a bracket of the scroll compressor shown in FIG. 29;

fig. 31 is a schematic cross-sectional view of a driving member, a first scroll, a second scroll, etc. of the scroll compressor shown in fig. 1;

fig. 32 is a schematic exploded cross-sectional perspective view of a driving member, a first scroll, a second scroll, etc. of the scroll compressor shown in fig. 31; and

fig. 33 is a schematic cross-sectional view of a scroll compressor according to a modification of the embodiment of the present invention in an assembled state of a bracket, a fixed shaft, a driving member, a second scroll, and the like.

Detailed Description

Embodiments of the present invention are described below with reference to the accompanying drawings.

Referring to fig. 18 to 26, a sleeve 9 for a driving member 3 of a scroll compressor 100 according to an embodiment of the present invention includes: a cylindrical body 94, and a fixing portion provided to the cylindrical body 94 for mating connection with other components such as the driving member 3. The fixing portion may include a recess or a protrusion.

Referring to fig. 18 to 19, in the embodiment of the present invention, the fixing portion includes a radial protrusion 96 protruding radially outward from an outer peripheral surface 95 of the cylindrical main body 94. The radial projections 96 may be a plurality of circumferentially spaced radial projections 96. The plurality of radial projections 96 may be equally spaced circumferentially. The radial projection 96 has a radially outward facing surface 961, and the surface 961 may be convex. For example, surface 961 is a roughened surface. According to an example of the present invention, the radial protrusion 96 is wedge-shaped in the axial direction such that the radial protrusion 96 becomes gradually smaller in size in the radial direction in the direction from the first end 97 to the second end 98 of the cylindrical body 94. The radial protrusion 96 may extend from a first end 97 of the cylindrical body 94 to between the first end 97 and a second end 98 of the cylindrical body 94.

In the embodiment shown in fig. 18 to 19, the fixing portion may also include a recess recessed radially inward from the outer peripheral surface 95 of the cylindrical main body 94. The radial recess may be a plurality of circumferentially spaced radial recesses. The plurality of radial recesses may be equally spaced in the circumferential direction.

Referring to fig. 22-23, in an embodiment of the present invention, the securing portion includes an axial projection 99 projecting axially outwardly from an end face 981 of the second end 98 of the tubular body 94. The axial projections 99 may be a plurality of circumferentially spaced axial projections 99. The plurality of axial projections 99 may be equally spaced apart in the circumferential direction. The axial projection 99 has a radially outward facing surface 991, and the surface 991 may be convex. The axial projection 99 may be wedge-shaped in the axial direction such that the axial projection 99 tapers in a direction axially outward from the end face 981 of the second end 98 of the cylindrical body 94.

In the embodiment shown in fig. 22-23, the securing portion may also include an axial recess recessed axially inward from the end face 981 of the second end 98 of the tubular body 94. The axial recess may be a plurality of circumferentially spaced axial recesses. The plurality of axial recesses may be equally spaced in the circumferential direction.

Referring to fig. 18 to 26, in an embodiment of the present invention, the sleeve 9 further includes: as the bearing bush of the first bearing 51, a bearing bush is provided in the cylindrical body 94, and the bearing bush is fixed in the cylindrical body 94. As shown in fig. 21, the bearing bush may have two circumferential end portions 511 that abut in the circumferential direction. The bearing cartridge may be an interference fit with the cylindrical body 94.

Referring to fig. 18-26, in an embodiment of the present invention, the bearing bushing is made of the same material as the cylindrical body 94, such as an aluminum alloy. The bearing bushing and the cylindrical body 94 may also be made of different materials, such as the bearing bushing being made of PTFE and the cylindrical body 94 being made of steel. The bearing bush may be made of a single material, for example, an aluminum alloy. The bearing bush may also be made of a composite material, for example, comprising, in order from the innermost side to the outermost side of the bearing bush: PTFE layer, copper layer and steel layer; or a carbon layer and a steel layer. According to an example of the invention, the hardness of the cylindrical body 94 may be greater than or equal to 30HRC. The cylindrical body 94 may be made of cast iron, alloy, steel, polymeric material, or powder metallurgy. This makes the cylindrical body 94 more wear-resistant and longer in life, and makes the cylindrical body 94 easy to process and low in cost.

Referring to fig. 18, 19, in the embodiment of the present invention, the cylindrical body 94 has a notch 940 recessed axially inward from the end face 971 of the first end 97 for lubricating oil to flow from the inside of the cylindrical body 94 to the outside of the cylindrical body 94.

Referring to fig. 1, a scroll compressor 100 according to an embodiment of the present invention includes a first scroll 11 and a second scroll 12. Referring to fig. 4 to 26, the driving member 3 according to the embodiment of the present invention includes: a hub 31 having an inner bore 30, the hub 31 including opposed first 311 and second 312 ends; and a flange portion 32 protruding radially outward from a first end portion 311 of the hub portion 31 of the driver 3, the driver 3 being connected to the first scroll 11 through the flange portion 32. The flange portion 32 connects the driving member 3 to the first scroll 11, thereby driving the first scroll 11 to rotate. For example, the flange portion 32 includes a connection member 130 (fig. 27, 28), and the connection member 130 connects the driving member 3 to the first scroll 11, thereby driving the first scroll 11 to rotate. The connection member 130 may be formed integrally with one of the first scroll 11 and the driving member 3, or may be a separate connection member.

Referring to fig. 5, in the embodiment of the present invention, the end surface 3120 of the second end 312 of the hub 31 of the driver 3 has the oil groove 56. The oil groove 56 may extend in a radial direction. According to an example of the present invention, as shown in fig. 5, the oil groove 56 is spaced apart from the outer periphery 3121 of the end surface 3120 of the second end 312 of the hub portion 31 of the driving member 3. The oil groove 56 may be at least one oil groove, or two or more oil grooves spaced apart at a certain distance (e.g., equidistant).

Referring to fig. 4 and 6, in the embodiment of the present invention, the hole wall 301 of the inner hole 30 of the hub 31 of the driver 3 has a stepped portion 302, and the stepped portion 302 of the hub 31 of the driver 3 has a stepped surface 303 facing the second direction D2. Referring to fig. 1 and 20, in the embodiment of the present invention, the fixed shaft 5 has a stepped portion 501, the stepped portion 501 of the fixed shaft 5 has a stepped surface 502 facing the first direction D1, and the scroll compressor 100 further includes a first thrust bearing 54, the first thrust bearing 54 being disposed between the stepped surface 303 of the stepped portion 302 of the hub portion 31 of the driver 3 and the stepped surface 502 of the stepped portion 501 of the fixed shaft 5.

Referring to fig. 4, 6, 7, 8, 10, 14, 15, in an embodiment of the invention, the driver 3 comprises at least one fluid channel 6 formed in a flange portion 32 of the driver 3, the flange portion 32 having a first surface 321 facing in a direction from the first end 311 to the second end 312; and a second surface 320 facing in a direction from the second end 312 to the first end 311, the fluid channel 6 having a fluid inlet 61 formed in the first surface 321, and a fluid outlet 62 formed in the second surface 320, such that fluid enters the fluid channel 6 through the fluid inlet 61 of the fluid channel 6 and exits from the fluid outlet 62. The driver 3 may comprise two fluid channels 6, the two fluid channels 6 being opposite to each other in the radial direction of the driver 3. The fluid channel 6 of the driver 3 may have a circular or elliptical or curved cross section. According to an example of the invention, as shown in fig. 4, 6, 7, 8, 10, the fluid channel 6 extends obliquely with respect to the axial direction of the driver 3, the fluid outlet 62 of the fluid channel 6 being further from the rotational axis 91 of the driver 3 than the fluid inlet 61. For example, assuming that a first plane passes through the point of the axis 93 of the fluid channel 6 at the fluid inlet 61 and the rotation axis 91 of the driver 3, and a second plane is perpendicular to the first plane and parallel to the rotation axis 91 of the driver 3, the angle of the axis 93 of the fluid channel 6 to the first plane is 0 to 60 degrees and the angle of the axis 93 of the fluid channel 6 to the second plane is 5 to 60 degrees. According to another example of the invention, as shown in fig. 14, 15, the fluid channel 6 extends in the axial direction of the driver 3, i.e. the axis 93 of the fluid channel 6 is parallel to the rotation axis 91 of the driver 3, the axis 93 of the fluid channel 6 is at an angle of 0 degrees to the first plane and the axis 93 of the fluid channel 6 is also at an angle of 0 degrees to the second plane.

Referring to fig. 8, 13 and 14, in the embodiment of the present invention, the flange portion 32 of the driving member 3 has a driving member coupling hole 323, the driving member coupling hole 323 of the flange portion 32 of the driving member 3 has a screw portion 324, and the coupling member 130 (fig. 27 and 28) includes a bolt 132, and the bolt 132 fixedly couples the first scroll 11 to the driving member 3 through the driving member coupling hole 323.

Referring to fig. 2, 4, 8, 12, 14, in an embodiment of the present invention, the flange portion 32 of the driver 3 has a driver pin hole 322. The outer wall 111 of the first scroll 11 has a scroll pin hole 114, and the connection 130 further includes: the pin 131, the pin 131 is inserted into the scroll pin hole 114 (fig. 2) of the outer wall 111 of the first scroll 11 and the driver pin hole 322 (fig. 7) of the flange portion 32 of the driver 3 to determine the relative positions of the first scroll 11 and the driver 3.

Referring to fig. 8, 11 and 14, in an embodiment of the present invention, the driving member 3 further includes: a weight port 325 formed in the flange portion 32, the weight port 325 being used to dynamically balance the driver 3. The weight ports may be blind holes extending from the second surface 320 of the flange portion 32 toward the first surface 321 of the flange portion 32. Referring to fig. 17, in a variant of the embodiment of the invention, the driver 3 does not have a weight port 325.

Referring to fig. 4, 6, 7, 8, 11, 31, 32, 33, in an embodiment of the present invention, the driving member 3 further includes: an eccentric ring hole 326 formed in the flange portion 32, an eccentric ring 341 (see fig. 28, 31, 32, 33) is provided in the eccentric ring hole 326, and a coupling pin 342 is inserted into a coupling pin hole 126 (fig. 3) formed in the second end plate 123 of the second scroll 12 and a hole 3410 (see fig. 28, 31, 32, 33) of the eccentric ring 341. The driver 3 may have three eccentric annular holes 326.

Referring to fig. 1, 18 to 26, a scroll compressor 100 according to an embodiment of the present invention includes: a first scroll 11, a second scroll 12, a bracket 4, a motor 7, a driving member 3 and a sleeve 9. The first scroll 11 includes a first end plate 112 and a first scroll wrap 113 extending from the first end plate 112 in the first direction D1. The second scroll 12 includes a second end plate 123 and a second scroll wrap 124 protruding from the second end plate 123 in a second direction D2 opposite to the first direction D1, the second scroll wrap 124 and the first scroll wrap 113 cooperating to form a compression chamber for compressing a medium. The bracket 4 is located on the side of the second scroll 12 remote from the first scroll 11. The drive member 3 is rotatably mounted to the frame 4 and located on the side of the second scroll 12 remote from the first scroll 11, the motor 7 drives the first scroll 11 to rotate about an axis of rotation 91 (fig. 4, 6, 9 to 13, 15, 28) by the drive member 3, and the first scroll 11 drives the second scroll 12 to rotate about the axis of rotation 92 (fig. 28). The rotation axis 91 is the rotation axis or axis of the driver 3 (fig. 4, 6, 9 to 13, 15). The rotation axis 91 and the rotation axis 92 are parallel to each other and spaced apart. The driving member 3 includes: a hub 31 having an inner bore 30, the hub 31 including opposed first 311 and second 312 ends; and a flange portion 32 extending radially outwardly from the first end portion 311 of the hub portion 31 of the driver 3. The inner bore 50 of the hub 31 has an inner bore portion 504 (see fig. 4 and 6) at the first end 311, and the hub 31 has a first fixing portion provided on the bore wall 304 (see fig. 4 and 6) of the inner bore portion 504. Referring to fig. 18 to 26, the sleeve 9 is disposed in the inner hole portion 504 of the hub 31, and the sleeve 9 includes: the tubular body 94, and a second fixing portion provided to the tubular body 94, the second fixing portion of the sleeve 9 being engaged with the first fixing portion of the hub 31. The sleeve 9 and the inner bore portion 504 of the hub 31 may be clearance fit; or the sleeve 9 may be an interference fit with the inner bore portion 504 of the hub 31. One of the first and second fixing parts may include a recess, and the other of the first and second fixing parts may include a protrusion fitted in the recess.

Referring to fig. 4 and 6 and fig. 18 to 20, in an embodiment of the present invention, the second fixing portion includes a radial protrusion 96 protruding radially outward from the outer peripheral surface 95 of the cylindrical body 94, and the first fixing portion includes a radial recess 306 on the hole wall 304 of the inner hole portion 504, the radial protrusion 96 being fitted in the radial recess 306. The radial recess 306 may be a plurality of circumferentially spaced radial recesses 306 and the radial projection 96 may be a plurality of circumferentially spaced radial projections 96 that fit into the plurality of radial recesses 306, respectively. The radial protrusion 96 has a radially outward facing surface 961, the surface 961 of the radial protrusion 96 may be convex, and the radial recess 306 has a radially inward facing surface 3061, and the surface 3061 of the radial recess 306 may be concave. The surface 961 may be a roughened surface. In the example of the present invention, the radial protrusion 96 is axially wedge-shaped such that the radial protrusion 96 becomes smaller in size in the radial direction in the direction from the first end 97 to the second end 98 of the cylindrical body 94, and the radial recess 306 is axially wedge-shaped such that the radial recess 306 becomes smaller in size in the radial direction in the direction from the first end 311 to the second end 312 of the hub 31. In the example of the invention, the radial protrusion 96 extends from the first end 97 of the cylindrical body 94 to between the first end 97 and the second end 98 of the cylindrical body 94, and an end 962 of the radial protrusion 96 facing the second end 98 of the cylindrical body 94 abuts an end 3062 of the radial recess 306 facing the second end 312 of the hub 31.

Referring to fig. 4 and 6 and fig. 18 to 20, in an embodiment of the present invention, which is not shown, the second fixing portion includes a radial recess, and the first fixing portion includes a radial protrusion, contrary to the above-described embodiment.

Referring to fig. 22-26, in an embodiment of the present invention, the second securing portion includes an axial protrusion 99 protruding axially outward from an end face 981 of the second end 98 of the tubular body 94, and the hole wall 304 of the inner hole portion 504 of the hub 31 has a securing step 307, the securing step 307 has a step face 3071 facing in a direction from the second end 312 to the first end 311 of the hub 31, the first securing portion includes an axial recess 3072 on the securing step 307, and the axial protrusion 99 is fitted in the axial recess 3072. The axial recess 3072 may be a plurality of circumferentially spaced axial recesses 3072 and the axial projection 99 may be a plurality of circumferentially spaced axial projections 99 that fit within the plurality of axial recesses 3072, respectively. According to an example of the invention, the axial projection 99 has a radially outward facing surface 991, the surface 991 of the axial projection 99 is convex, and the axial recess 3072 has a radially inward facing surface 3073, the surface 3073 of the axial recess 3072 being concave. The axial projection 99 may be axially wedge-shaped such that the axial projection 99 tapers in a direction axially outward from the end face 981 of the second end 98 of the cylindrical body 94, and the axial recess 3702 may be axially wedge-shaped such that the axial recess 3072 tapers in a direction from the first end 311 to the second end 312 of the hub 31.

Referring to fig. 22 to 26, in an embodiment of the present invention, which is not shown, the second fixing portion includes an axial recess, and the first fixing portion includes an axial protrusion, contrary to the above-described embodiment.

Referring to fig. 18 to 26, in an embodiment of the present invention, the sleeve 9 further includes: as the bearing bush of the first bearing 51, a bearing bush is provided in the cylindrical body 94. As shown in fig. 21, the bearing bush may have two circumferential end portions 511 abutting in the circumferential direction. The bearing bush is interference fit with the cylindrical body 94.

Referring to fig. 18-26, in an embodiment of the present invention, the bearing bushing is made of the same material as the cylindrical body 94, such as an aluminum alloy. The bearing bushing and the cylindrical body 94 may also be made of different materials, such as the bearing bushing being made of PTFE and the cylindrical body 94 being made of steel. The bearing bush may be made of a single material, for example, an aluminum alloy. The bearing bush may also be made of a composite material, for example, comprising, in order from the innermost side to the outermost side of the bearing bush: PTFE layer, copper layer and steel layer; or a carbon layer and a steel layer. According to an example of the invention, the hardness of the cylindrical body 94 may be greater than or equal to 30HRC. The cylindrical body 94 may be made of cast iron, powder metallurgy, alloy, steel, or a polymeric material.

Referring to fig. 1, a scroll compressor 100 according to an embodiment of the present invention includes: a first scroll 11, a second scroll 12, a bracket 4, a motor 7 and a driving member 3. The first scroll 11 includes a first end plate 112 and a first scroll wrap 113 extending from the first end plate 112 in the first direction D1. The second scroll 12 includes a second end plate 123 and a second scroll wrap 124 protruding from the second end plate 123 in a second direction D2 opposite the first direction D1, the second scroll wrap 124 and the first scroll wrap 113 cooperating to form a compression chamber for compressing a medium. The bracket 4 is located on the side of the second scroll 12 remote from the first scroll 11. The drive member 3 is rotatably mounted to the frame 4 and located on the side of the second scroll 12 remote from the first scroll 11, the motor 7 drives the first scroll 11 to rotate about an axis of rotation 91 (fig. 4, 6, 9 to 13, 15, 28) by the drive member 3, and the first scroll 11 drives the second scroll 12 to rotate about an axis of rotation 92 (fig. 28). The rotation axis 91 is the rotation axis or axis of the driver 3 (fig. 4, 6, 9 to 13, 15). The rotation axis 91 and the rotation axis 92 are parallel to each other and spaced apart. The driving member 3 includes: a hub 31 having an inner bore 30, the hub 31 including opposed first 311 and second 312 ends; and a flange portion 32 protruding radially outward from a first end portion 311 of the hub portion 31 of the driver 3, the driver 3 being connected to the first scroll 11 through the flange portion 32. The motor 7 drives the first scroll 11 to rotate through the hub 31 of the driving member 3, and the first scroll 11 drives the second scroll 12 to rotate.

Referring to fig. 1, in an embodiment of the present invention, the scroll compressor 100 further includes a housing 101, and the housing 101 may include a first housing 1011, a second housing 1012, and a third housing 1013. The first housing 1011 and the second housing 1012 form a sealed space, and the first scroll 11, the second scroll 12, the bracket 4, the motor 7, the driver 3, and the like are provided in the housing 101. The second housing 1012 and the third housing 1013 define an exhaust chamber. The bracket 4 may be fixed to the first housing 1011, for example, the bracket 4 is welded to the first housing 1011, the bracket 4 is fixed to the first housing 1011 by interference fit with the first housing 1011, or the bracket 4 is fixed to the first housing 1011 by bolts. One end of the bracket 4 may be fixed to the bottom of the housing 101 or the bottom of the first housing 1011.

Referring to fig. 1 and 2, in the embodiment of the present invention, the first scroll 11 further includes an outer wall 111 protruding from the first end plate 112 in the first direction D1, the outer wall 111 being radially outside the first scroll 113 and the second scroll 12, the outer wall 111 being provided with a connection 130 (fig. 27, 28), and the driving member 3 being connected to the first scroll 11 by the connection 130 (fig. 27, 28). The outer wall 111 may have an annular shape.

Referring to fig. 1, 27 to 30, in an embodiment of the present invention, the scroll compressor 100 further includes: and a fixed shaft 5, the fixed shaft 5 being fixed to the bracket 4. The driving member 3 is rotatably mounted to the bracket 4 by the hub 31 of the driving member 3 being rotatably mounted to the fixed shaft 5. Referring to fig. 1, 2 to 17, 27, 28, 31 to 33, in the embodiment of the present invention, the second end plate 123 of the second scroll 12 is rotatably supported on the flange portion 32 of the driver 3. According to an example of the present invention, referring to fig. 2, 4, 8, 10, 12, 14, 27, 28, the outer wall 111 of the first scroll 11 has a scroll pin hole 114 (fig. 2), and the flange portion 32 of the driver 3 has a driver pin hole 322 (fig. 4, 8, 12, 14). The outer wall 111 of the first scroll 11 has a scroll connection hole 116 (fig. 27, 28), the flange portion 32 of the driver 3 has a driver connection hole 323 (fig. 8, 13, 14, 27, 28), one of the driver connection hole 323 of the flange portion 32 of the driver 3 and the scroll connection hole 116 of the outer wall 111 of the first scroll 11 has a screw portion 324, and the connector 130 (fig. 27, 28) includes: a pin 131 and a bolt 132, the pin 131 being inserted into the scroll pin hole 114 (fig. 2) of the outer wall 111 of the first scroll 11 and the driver pin hole 322 (fig. 4, 8, 12, 14) of the flange portion 32 of the driver 3 to determine the relative positions of the first scroll 11 and the driver 3, the bolt 132 fixedly connecting the first scroll 11 and the driver 3 through the scroll connecting hole 116 (fig. 27, 28) and the driver connecting hole 323.

Referring to fig. 1, 20-28, in an embodiment of the present invention, scroll compressor 100 further includes a second bearing 52. The first end 311 of the hub 31 is mounted on the fixed shaft 5 by a first bearing 51, while the second end 312 of the hub 31 is mounted on the fixed shaft 5 by a second bearing 52. Referring to fig. 1, 20, 27, 28, in an embodiment of the present invention, the second scroll 12 further includes a hub 121 extending from the second end plate 123 in the first direction D1, and the fixed shaft 5 has an axial inner bore 50, see fig. 1, 20. The scroll compressor 100 further includes a third bearing 53, and the hub 121 of the second scroll 12 is mounted in the axial bore 50 of the stationary shaft 5 by the third bearing 53.

Referring to fig. 1, 4, 6 and 20, in the embodiment of the present invention, the hole wall 301 of the inner hole 30 of the hub 31 of the driver 3 has a step portion 302, the step portion 302 of the hub 31 of the driver 3 has a step surface 303 facing the second direction D2, the fixed shaft 5 has a step portion 501, the step portion 501 of the fixed shaft 5 has a step surface 502 facing the first direction D1, the scroll compressor 100 further includes a first thrust bearing 54, and the first thrust bearing 54 is disposed between the step surface 303 of the step portion 302 of the hub 31 of the driver 3 and the step surface 502 of the step portion 501 of the fixed shaft 5. The first thrust bearing 54 may be any suitable existing thrust bearing. For example, the first thrust bearing 54 may be an annular thrust washer made of a wear-resistant metallic or non-metallic material, or the first thrust bearing 54 may be a ball thrust bearing, a roller thrust bearing, or the like.

Referring to fig. 1, 29, 30, in an embodiment of the present invention, the stand 4 includes: the cylindrical portion 41, and the flange portion 42 radially extending from the cylindrical portion 41 of the bracket 4, the second end 312 of the hub portion 31 of the driver 3 being supported on the flange portion 42 of the bracket 4. According to one example of the present invention, a part of the fixed shaft 5 is inserted into the cylindrical portion 41 of the holder 4 and fixed to the cylindrical portion 41 of the holder 4, and the fixed shaft 5 has a cylindrical shape.

Referring to fig. 1, 5, in the embodiment of the present invention, the end surface 3120 of the second end 312 of the hub 31 of the driver 3 has the oil groove 56 on the annular contact area of the second end 312 of the hub 31 of the driver 3 and the flange portion 42 of the bracket 4, the oil groove 56 extending laterally from the radially inner side of the annular contact area toward the radially outer side of the annular contact area to traverse a portion of the annular contact area, the oil groove 56 being spaced apart from the radially outer edge of the annular contact area in the radial direction. The oil groove 56 may extend in a radial direction. According to an example of the invention, the oil groove 56 is spaced from the outer periphery 3121 of the end face 3120 of the second end 312 of the hub 31 of the driver 3. The oil groove 56 may also be formed on the surface 420 of the flange portion 42 of the bracket 4. The oil groove 56 may be at least one oil groove, or two or more oil grooves spaced apart at a certain distance (e.g., equidistant).

Referring to fig. 1, in an embodiment of the invention, the electric machine 7 may be an axial flux electric machine or a radial flux electric machine. In one embodiment, the motor 7 includes a rotor 71 and a stator 72 fixed to the bracket 4, and the rotor 71 of the motor 7 drives the first scroll 11 to rotate by driving the driving member 3 to rotate. The rotor 71 of the motor 7 is disposed on a side of the stator 72 facing the first direction D1 or the second direction D2.

Referring to fig. 1, 2, 4, 6 to 10, 14, 15, and 27, in an embodiment of the present invention, the flange portion 32 of the driving member 3 is sealingly connected with the outer wall 111 of the first scroll 11 to form the suction chamber 88 of the scroll compressor 100, and fluid enters the compression chamber through the suction chamber 88. Referring to fig. 1, 4, 6-10, 14, 15, the driver 3 comprises at least one fluid channel 6 formed in the flange portion 32 of the driver 3, the fluid channel 6 having a fluid inlet 61 formed in a surface 321 of the flange portion 32 of the driver 3 facing the first direction D1, and a fluid outlet 62 formed in a surface 320 of the flange portion 32 of the driver 3 facing the second direction D2, such that fluid passes through the fluid inlet 61 of the fluid channel 6, into the fluid channel 6, and from the fluid outlet 62 into the suction chamber 88. The driver 3 may comprise two fluid channels 6, the two fluid channels 6 being opposite to each other in the radial direction of the driver 3. The fluid channel 6 of the driver 3 may have a circular cross-section. According to one example of the invention, as shown in fig. 4, 6 to 10, the fluid channel 6 extends obliquely with respect to the axial direction of the driver 3, the fluid outlet 62 of the fluid channel 6 being further from the rotational axis 91 of the driver 3 than the fluid inlet 61. For example, assuming that a first plane passes through the point of the axis 93 of the fluid channel 6 at the fluid inlet 61 and the rotation axis 91 of the driver 3, and a second plane is perpendicular to the first plane and parallel to the rotation axis 91 of the driver 3, the angle of the axis 93 of the fluid channel 6 to the first plane is 0 to 60 degrees and the angle of the axis 93 of the fluid channel 6 to the second plane is 5 to 60 degrees. According to another example of the invention, as shown in fig. 14, 15, the fluid channel 6 extends in the axial direction of the driver 3, i.e. the axis 93 of the fluid channel 6 is parallel to the rotation axis 91 of the driver 3, the axis 93 of the fluid channel 6 is at an angle of 0 degrees to the first plane and the axis 93 of the fluid channel 6 is also at an angle of 0 degrees to the second plane.

Referring to fig. 1, 2, in the embodiment of the present invention, the outer wall 111 has a recess 1110 at a position corresponding to the position of the fluid outlet 62 of the fluid passage 6, the recess 1110 is formed on a surface 1111 of the outer wall 111 facing the rotation axis of the first scroll 11, and a wall surface 11101 of the recess 1110 facing the rotation axis of the first scroll 11 is gradually inclined or curved toward the rotation axis of the first scroll 11 in a direction toward the first end plate 112 of the first scroll 11.

Referring to fig. 1, in an embodiment of the present invention, the scroll compressor 100 further includes: the oil applying bolt 81, the oil applying bolt 81 is accommodated in the inner hole 50 of the fixed shaft 5, and one end is positioned in the oil pool at the bottom of the housing 101, and the other end is fixedly connected with the hub 121 of the second scroll 12. Scroll compressor 100 may also include any other suitable pump.

When the compressor 100 is operated, referring to fig. 1, the motor 7 drives the first scroll 11 to rotate by the driving member 3, and the first scroll 11 drives the second scroll 12 to rotate. The refrigerant enters the sealed space formed by the first housing 1011 and the second housing 1012 of the housing 101 through the inlet 82, a part of the refrigerant flows upward, bypasses the upper end of the cylindrical shutter 83, then flows downward, enters the fluid passage 6 through the fluid inlet 61 of the fluid passage 6 (see fig. 4, 6 to 8, 10, 14, 15), and another part of the refrigerant flows downward, enters the motor 7 below the lower end of the cylindrical shutter 83 to cool the motor, then flows upward, and enters the fluid passage 6 through the fluid inlet 61 of the fluid passage 6. All of the refrigerant passes through the suction chamber 88, into the compression chamber formed by the second scroll wrap 124 and the first scroll wrap 113, and the compressed refrigerant is discharged through the outlet 84. Referring to fig. 4, 6 to 8, and 10, if the fluid passage 6 extends obliquely with respect to the axial direction of the driving member 3, the refrigerant entering the fluid passage 6 through the fluid inlet 61 of the fluid passage 6 undergoes primary compression due to centrifugal force and then undergoes secondary compression via the suction chamber 88 into the compression chamber formed by the second scroll wrap 124 and the first scroll wrap 113. At the same time, the second scroll 12 rotates the oil feed bolt 81 provided in the axial inner hole 50 of the fixed shaft 5, sucks the lubricating oil contained in the oil groove at the bottom of the first housing 1011 of the housing 101 into the axial inner hole 50 of the fixed shaft 5, and the first portion of the lubricating oil flows between the second bearing 52 and the second end 312 of the boss 31 of the driver 3 and the flange portion 42 (see fig. 1) of the bracket 4 through the lateral through hole 85 (e.g., radial through hole) on the fixed shaft 5. A second portion of the lubricating oil enters the gap between the hub 121 of the second scroll 12 and the third bearing 53 to lubricate the third bearing 53, and a portion of the lubricating oil entering the gap between the hub 121 of the second scroll 12 and the third bearing 53 enters the gap between the second end plate 123 of the second scroll 12 and the flange portion 32 of the driver 3, and finally enters the space formed by the first scroll 11 and the second scroll 12 through the fluid passage 6 to lubricate the first scroll 11 and the second scroll 12. Another part of the lubricating oil that entered the gap between the hub 121 of the second scroll 12 and the third bearing 53 bypasses the upper end portion of the third bearing 53 into the first bearing 51, and partly enters the oil return passage 862 formed in the fixed shaft 5, then enters the oil return passage 861 formed in the fixed shaft 5 through the communication hole 89, and finally returns to the oil groove at the bottom of the first housing 1011 of the housing 101. The lubricating oil that has entered the first bearing 51 enters the oil return passage 862 through the lateral through hole 87 (e.g., radial through hole), then enters the oil return passage 861 through the communication hole 89, and finally returns to the oil groove at the bottom of the first housing 1011 of the housing 101.

With the sleeve 9 for the driving member 3 of the scroll compressor 100 according to the embodiment of the present invention, contact between the first bearing 51 and the driving member 3 can be prevented. The driving member 3 expands due to the high speed rotation, and the sleeve 9 fixes the first bearing 51.

According to the scroll compressor of the embodiment of the invention, since the first scroll and the second scroll respectively rotate around the own rotation axis, the compression efficiency is improved. In addition, an axial flux motor (e.g., a disc motor, which may include a stator fixed to the bracket 4 and a rotor fixed to the driving member) may be used, and the axial size of the motor may be made smaller, thereby making the compressor more compact. In addition, due to the structural design of the driving member, the first scroll can be driven to rotate by the driving member, and the first scroll can be driven to rotate by the second scroll, so that all bearings can be further arranged on the same side of the compressor, such as the same side of the second scroll in the first direction D1, and the compressor can be further compact. In addition, in the conventional co-rotating scroll compressor, the shaft sleeve is often installed in the inner hole of the rotating member in an interference manner, but when the scroll compressor operates at a high speed, the inner hole becomes large under the action of centrifugal force, so that the adhesive force of the shaft sleeve can be reduced, and the risk of falling off of the shaft sleeve is increased. Meanwhile, due to the existence of a fit clearance between the bearing and the shaft and assembly errors, the problem of local contact can be caused when the inner diameter of the shaft sleeve is contacted with the outer diameter of the shaft, so that the bearing capacity of the shaft sleeve is reduced. In the embodiment of the invention, through the structural design of the driving piece and the matching of the flange design outside the sleeve and the inner hole of the deformation flange, the problem that the shaft sleeve and the driving piece cannot rotate relatively and the bearing cannot fall off can be guaranteed. And simultaneously, the outer diameter of the sleeve matched with the inner hole of the driving part is processed into an arc surface, so that the inner surface of the shaft sleeve is uniformly contacted with the matched shaft outer diameter, and the bearing capacity of the bearing is improved.

Although the above embodiments have been described, some of the features of the above embodiments can be combined to form new embodiments.

Claims

1. A scroll compressor comprising:

a first scroll (11) including a first end plate and a first scroll wrap extending from the first end plate in a first direction (D1);

a second scroll (12) including a second end plate and a second scroll wrap extending from the second end plate in a second direction (D2) opposite the first direction, the second scroll wrap and the first scroll wrap cooperating to form a compression chamber for a compressed medium;

a bracket (4) positioned on the side of the second scroll away from the first scroll;

a motor;

a driving member (3) rotatably mounted to the bracket and located at a side of the second scroll away from the first scroll, the motor driving the first scroll to rotate through the driving member, and the first scroll driving the second scroll to rotate, the driving member (3) comprising: a hub (31) having an inner bore, the hub including opposed first and second ends; and a flange portion (32) extending radially outwardly from a first end of the hub portion of the driver, the bore of the hub portion (31) having a bore portion at the first end, the hub portion (31) having a first securing portion disposed on a bore wall of the bore portion; and

-a sleeve (9) arranged in the inner bore portion of the hub (31), and the sleeve (9) comprises: the sleeve comprises a cylindrical main body (94) and a second fixing part arranged on the cylindrical main body (94), wherein the second fixing part of the sleeve is matched with the first fixing part of the hub part (31).

2. The scroll compressor of claim 1, wherein:

said sleeve being in clearance fit with said inner bore portion of said hub (31); or alternatively

The sleeve is an interference fit with the inner bore portion of the hub (31).

3. The scroll compressor of claim 1, wherein:

one of the first and second fixing portions includes a recess, and the other of the first and second fixing portions includes a protrusion fitted in the recess.

4. The scroll compressor of claim 1, wherein:

the second fixing portion includes a radial projection (96) projecting radially outwardly from an outer peripheral surface of the cylindrical body,

the first fixing portion includes a radial recess (306) on a wall of the inner bore portion, the radial projection (96) being fitted in the radial recess (306).

5. The scroll compressor of claim 4, wherein:

The radial recess is a plurality of circumferentially spaced radial recesses and the radial projection (96) is a plurality of circumferentially spaced radial projections that fit into the plurality of radial recesses, respectively.

6. The scroll press of claim 4, wherein:

the radial protrusion (96) has a radially outward facing surface (961), the surface of the radial protrusion (96) being convex, and the radial recess (306) has a radially inward facing surface (3061), the surface of the radial recess being concave.

7. The scroll compressor of claim 4, wherein:

the radial protrusion (96) is axially wedge-shaped such that a dimension of the radial protrusion in a radial direction becomes smaller in a direction from a first end (97) to a second end (98) of the cylindrical body, and the radial recess (306) is axially wedge-shaped such that a dimension of the radial recess in a radial direction becomes smaller in a direction from a first end (311) to a second end (312) of the hub.

8. The scroll compressor of claim 4, wherein:

the radial projections (96) have radially outward facing surfaces (961) that are roughened surfaces.

9. The scroll compressor of claim 4, wherein:

the radial protrusion (96) extends from a first end (97) of the tubular body to between the first end (97) and a second end (98) of the tubular body, and an end (962) of the radial protrusion (96) facing the second end (98) of the tubular body abuts an end (3062) of the radial recess (306) facing the second end (312) of the hub.

10. The scroll compressor of claim 1, wherein:

the second fixing portion includes an axial projection (99) projecting axially outwardly from an end face of the second end portion of the cylindrical body, and

the bore wall of the bore portion of the hub (31) has a fixing step (307), the fixing step (307) having a step face (3071) facing in a direction from the second end to the first end of the hub (31), the first fixing portion including an axial recess (3072) on the fixing step, the axial projection fitting in the axial recess.

11. The scroll compressor of claim 10, wherein:

the axial recess is a plurality of circumferentially spaced axial recesses and the axial projection is a plurality of circumferentially spaced axial projections respectively fitted in the plurality of axial recesses.

12. The scroll compressor of claim 10, wherein:

the axial projection (99) has a radially outward facing surface (991), the surface of the axial projection being convex, and the axial recess (3072) has a radially inward facing surface (3073), the surface of the axial recess being concave.

13. The scroll compressor of claim 10, wherein:

the axial projection (99) is axially wedge-shaped such that the axial projection (99) tapers in a direction axially outward from an end face (981) of the second end (98) of the tubular body, and the axial recess (3702) is axially wedge-shaped such that the axial recess tapers in a direction from the first end to the second end of the hub.

14. The scroll compressor of claim 1, wherein:

the sleeve further comprises a bearing bush (51) disposed within the cylindrical body.

15. The scroll compressor of claim 14, wherein:

the bearing bush has two circumferential ends (511) that abut in the circumferential direction.

16. The scroll compressor of claim 14 or 15, wherein:

the bearing bush is in interference fit with the cylindrical body.

17. The scroll compressor of claim 14 or 15, wherein:

the bearing bush and the cylindrical body are made of the same material.

18. The scroll compressor of claim 17, wherein:

the material is an aluminum alloy.

19. The scroll compressor of claim 14 or 15, wherein:

the bearing bush and the cylindrical body are made of different materials.

20. The scroll compressor of claim 19, wherein:

the bearing bush is made of PTFE and the cylindrical body is made of steel.

21. The scroll compressor of claim 14 or 15, wherein:

the bearing bush is made of a single material.

22. The scroll compressor of claim 21, wherein:

the material is an aluminum alloy.

23. The scroll compressor of claim 14 or 15, wherein:

the bearing bush is made of a composite material.

24. The scroll compressor of claim 23, wherein:

the composite material comprises from the innermost side to the outermost side of the bearing bush in sequence:

PTFE layer, copper layer and steel layer; or alternatively

Carbon layer and steel layer.

25. The scroll compressor of claim 1, wherein:

The hardness of the cylindrical body is greater than or equal to 30HRC.

26. The scroll compressor of claim 1, wherein:

the cylindrical main body is made of cast iron, powder metallurgy, alloy, steel or high polymer materials.

27. The scroll compressor of claim 1, further comprising:

a fixed shaft (5) fixed to the bracket,

wherein the driving member is rotatably mounted to the bracket by being rotatably mounted to the fixed shaft through the hub portion of the driving member, and

wherein the hub of the drive member is mounted at the first end on the stationary shaft via the sleeve (9).

28. The scroll compressor of claim 1, wherein:

the cylindrical body has a notch (940) recessed axially inward from an end face of the first end (97) for lubricating oil to flow from an inner side of the cylindrical body to an outer side of the cylindrical body.

29. The scroll compressor of claim 1, wherein:

the motor is an axial flux motor and comprises a stator and a rotor, wherein the stator is fixed on the bracket, and the rotor is fixedly connected with the driving piece and used for driving the driving piece to rotate so as to drive the first vortex plate to rotate.

30. A sleeve (9) for a scroll compressor, comprising:

a tubular body (94)

And a fixing part arranged on the tubular main body (94) and used for being matched and connected with other components.

31. The sleeve for a scroll compressor of claim 30, wherein:

the fixing portion includes a recess or a protrusion.

32. The sleeve for a scroll compressor of claim 30, wherein:

the fixing portion includes a radial projection (96) projecting radially outward from an outer peripheral surface (95) of the cylindrical body.

33. The sleeve for a scroll compressor of claim 32, wherein:

the radial projections (96) are a plurality of circumferentially spaced radial projections.

34. The sleeve for a scroll compressor of claim 33, wherein:

the plurality of radial projections (96) are equally spaced circumferentially.

35. The sleeve for a scroll compressor of claim 32, wherein:

the radial projection (96) has a radially outward facing surface (961), the surface being convex.

36. The sleeve for a scroll compressor of claim 32, wherein:

the radial projection (96) is wedge-shaped in the axial direction such that the radial dimension of the radial projection becomes gradually smaller in the direction from the first end (97) to the second end (98) of the cylindrical body.

37. The sleeve for a scroll compressor of claim 32, wherein:

38. The sleeve for a scroll compressor of claim 32, wherein:

the radial projection (96) extends from a first end (97) of the cylindrical body to between the first end (97) and a second end (98) of the cylindrical body.

39. The sleeve for a scroll compressor of claim 30, wherein:

the fixing portion includes a recess recessed radially inward from an outer peripheral surface of the cylindrical body.

40. The sleeve for a scroll compressor of claim 39, wherein:

the radial recess is a plurality of circumferentially spaced radial recesses.

41. The sleeve for a scroll compressor of claim 40, wherein:

the plurality of radial recesses are equally spaced circumferentially.

42. The sleeve for a scroll compressor of claim 30, wherein:

the fixing portion includes an axial projection (99) projecting axially outwardly from an end face (981) of the second end portion (98) of the cylindrical body (94).

43. The sleeve for a scroll compressor of claim 42, wherein:

The axial projection (99) is a plurality of circumferentially spaced axial projections.

44. The sleeve for a scroll compressor of claim 43, wherein:

the plurality of axial projections (99) are equally spaced circumferentially.

45. The sleeve for a scroll compressor of claim 42, wherein:

the axial projection (99) has a radially outward facing surface (991), the surface (991) being convex.

46. The sleeve for a scroll compressor of claim 42, wherein:

the axial projection (99) is axially wedge-shaped such that the axial projection (99) tapers in a direction axially outward from an end face (981) of the second end (98) of the tubular body.

47. The sleeve for a scroll compressor of claim 30, wherein:

the fixing portion includes an axial recess recessed axially inward from an end face (981) of a second end portion (98) of the cylindrical body (94).

48. The sleeve for a scroll compressor of claim 47, wherein:

the axial recess is a plurality of circumferentially spaced axial recesses.

49. The sleeve for a scroll compressor of claim 48, wherein:

the plurality of axial recesses are equally spaced circumferentially.

50. The sleeve for a scroll compressor of claim 30, further comprising:

and a bearing bush (51) provided in the cylindrical body.

51. The sleeve for a scroll press of claim 50 wherein:

the bearing bush (51) has two circumferential ends (511) that abut in the circumferential direction.