DRIVE MEMBER FOR SCROLL COMPRESSOR, AND SCROLL COMPRESSOR

Abstract

A drive member for a scroll compressor and the scroll compressor including the drive member. The scroll compressor includes a first scroll plate and a second scroll plate. The drive member includes a hub portion, which has an inner hole, wherein the hub portion includes a first end and a second end opposite to each other, and a flange portion, which extends radially outwards from the first end of the hub portion of the driving member. By means of the flange portion, the drive member is connected to the first scroll plate of the scroll compressor, such that the first scroll plate is driven to rotate. The scroll compressor has a compact structure, a small size and light weight.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a National Stage application of International Patent Application No. PCT/CN2022/143419, filed on Dec. 29, 2022, which claims priority to Chinese Patent Applications No. 202111681234.3, filed on Dec. 31, 2021, and No. 202123441551.6, filed on Dec. 31, 2021, each of which is hereby incorporated by reference in its entirety.

TECHNICAL FIELD

Embodiments of the present invention relate to a drive member for a scroll compressor, and a scroll compressor comprising the same.

BACKGROUND

A conventional scroll compressor comprises a fixed scroll and an orbiting scroll. The fixed scroll has an end plate and a fixed scroll wrap projecting from the end plate. The orbiting scroll has an end plate and an orbiting scroll wrap projecting from the end plate thereof, the orbiting scroll wrap and the fixed scroll wrap cooperating to form a compression chamber for compressing a medium. An electric motor drives the orbiting scroll to rotate by means of a drive shaft, so as to compress the medium in the compression chamber.

SUMMARY

Embodiments of the present invention provide a drive member for a scroll compressor, and a scroll compressor comprising the same, whereby, for example, scroll compressor performance can be improved.

Embodiments of the present invention provide a drive member for a scroll compressor, the scroll compressor comprising: a first scroll and a second scroll, the drive member comprising: a hub part with an internal hole, the hub part comprising a first end and a second end opposite each other; and a flange part projecting radially outward from the first end of the hub part of the drive member, wherein the flange part connects the drive member to the first scroll of the scroll compressor, so as to drive the first scroll to rotate, wherein the first scroll drives the second scroll to rotate.

According to an embodiment of the present invention, the flange part comprises a connecting member, for connecting the drive member to the first scroll of the scroll compressor.

According to an embodiment of the present invention, an end face of the second end of the hub part of the drive member has an oil groove.

According to an embodiment of the present invention, the oil groove is separated from an outer peripheral edge of the end face of the second end of the hub part of the drive member.

According to an embodiment of the present invention, the oil groove extends in a radial direction.

According to an embodiment of the present invention, a step part is provided on a hole wall of the internal hole of the hub part, the step part of the hub part having a step face.

According to an embodiment of the present invention, the drive member further comprises: at least one fluid channel formed in the flange part, the flange part having a first surface facing in a direction from the first end to the second end, and a second surface facing in a direction from the second end to the first end, the fluid channel having a fluid inlet formed in the first surface, and a fluid outlet formed in the second surface, such that fluid enters the fluid channel through the fluid inlet of the fluid channel, and flows out through the fluid outlet.

According to an embodiment of the present invention, the fluid channel extends in an axial direction of the drive member.

According to an embodiment of the present invention, the fluid channel extends obliquely relative to an axial direction of the drive member, and the fluid outlet of the fluid channel is farther away from an axis of the drive member than the fluid inlet is.

According to an embodiment of the present invention, if a first plane passes through a rotation axis of the drive member and a point on an axis of the fluid channel, said point being located at the fluid inlet, and a second plane is perpendicular to the first plane and parallel to the rotation axis of the drive member, then an angle between the axis of the fluid channel and the first plane is 0-60 degrees, and an angle between the axis of the fluid channel and the second plane is 5-60 degrees.

According to an embodiment of the present invention, the drive member comprises two fluid channels, the two fluid channels being opposite each other in a radial direction of the drive member.

According to an embodiment of the present invention, the fluid channel of the drive member has a round or elliptical or curved cross section.

According to an embodiment of the present invention, the flange part has a drive member connecting hole, the drive member connecting hole having a threaded part, for fixedly connecting the drive member to the first scroll by a bolt.

According to an embodiment of the present invention, the drive member further comprises: a counterweight hole formed in the flange part, for making the drive member dynamically balanced.

According to an embodiment of the present invention, the flange part has a first surface facing in a direction from the first end to the second end, and a second surface facing in a direction from the second end to the first end, and the counterweight hole is a blind hole, which extends from the second surface of the flange part toward the first surface of the flange part.

According to an embodiment of the present invention, the drive member further comprises: an annular protrusion protruding from a surface of the flange part, the annular protrusion having an annular wedge-shaped protrusion portion, a cross section of the wedge-shaped protrusion portion in a radial direction having a wedge shape, and the wedge-shaped protrusion portion having a wedge-shaped protrusion surface facing axially outward; in a cross section in a radial direction, an axial distance between a first wedge-shaped protrusion point, in a radial direction, of the wedge-shaped protrusion surface and said surface of the flange part is largest, and an axial distance between a second wedge-shaped protrusion point in a radial direction and said surface of the flange part is zero; and at least a portion of the wedge-shaped protrusion surface, corresponding to the first wedge-shaped protrusion point, is within an annular region of said surface of the flange part of the drive member, said annular region being used to support said surface of the second end plate of the second scroll.

According to an embodiment of the present invention, at the first wedge-shaped protrusion point, an axial distance between the wedge-shaped protrusion surface and said surface of the flange part is within the range of 20 microns-40 microns or within the range of 0.1 microns −1 millimeter.

According to an embodiment of the present invention, the first wedge-shaped protrusion point is at a radially outer side of the second wedge-shaped protrusion point, or the first wedge-shaped protrusion point is at a radially inner side of the second wedge-shaped protrusion point.

According to an embodiment of the present invention, the annular protrusion also has an annular transitional protrusion portion, the transitional protrusion portion having a transitional protrusion surface facing axially outward; in a cross section in a radial direction, the transitional protrusion surface extends from a point on the wedge-shaped protrusion surface, corresponding to the first wedge-shaped protrusion point, to said surface of the flange part by extending away from the second wedge-shaped protrusion point and toward said surface of the flange part.

According to an embodiment of the present invention, a cross section of the transitional protrusion portion in a radial direction has a wedge shape.

According to an embodiment of the present invention, a dimension of the transitional protrusion portion in a radial direction is smaller than a dimension of the wedge-shaped protrusion portion in a radial direction.

Embodiments of the present invention further provide a scroll compressor, comprising: a first scroll, comprising a first end plate and a first scroll wrap projecting from the first end plate in a first direction; a second scroll, comprising a second end plate and a second scroll wrap projecting from the second end plate in a second direction opposite to the first direction, the second scroll wrap and the first scroll wrap cooperating to form a compression chamber for compressing a medium; a support, located at a side of the second scroll that is remote from the first scroll; an electric motor; and the drive member described above, the drive member being rotatably mounted to the support and located at the side of the second scroll that is remote from the first scroll, the drive member comprising: a hub part with an internal hole, the hub part comprising a first end and a second end opposite each other; and a flange part projecting radially outward from the first end of the hub part of the drive member, the drive member being connected to the first scroll by means of the flange part, the electric motor driving the first scroll to rotate by means of the hub part of the drive member, and the first scroll driving the second scroll to rotate.

According to an embodiment of the present invention, the first scroll further comprises an outer wall projecting from the first end plate in the first direction, the outer wall being at a radially outer side of the first scroll wrap and the second scroll, and the outer wall being provided with a connecting member, the drive member being connected to the first scroll by means of the connecting member.

According to an embodiment of the present invention, the outer wall has an annular shape.

According to an embodiment of the present invention, the scroll compressor further comprises: a fixed shaft fixed to the support, the drive member being rotatably mounted to the support by having the hub part of the drive member rotatably mounted on the fixed shaft.

According to an embodiment of the present invention, the second end plate of the second scroll is rotatably supported on the flange part of the drive member.

According to an embodiment of the present invention, the scroll compressor further comprises: a first bearing, the first end of the hub part being mounted on the fixed shaft by means of the first bearing; and a second bearing, the second end of the hub part being mounted on the fixed shaft by means of the second bearing.

According to an embodiment of the present invention, a step part is provided on a hole wall of the internal hole of the hub part of the drive member, the step part of the hub part of the drive member having a step face facing in the second direction; the fixed shaft has a step part, the step part of the fixed shaft having a step face facing in the first direction; and the scroll compressor further comprises a first thrust bearing, the first thrust bearing being disposed between the step face of the step part of the hub part of the drive member and the step face of the step part of the fixed shaft.

According to an embodiment of the present invention, the support comprises a tubular part, and a flange part projecting radially from the tubular part of the support, the second end of the hub part of the drive member being supported on the flange part of the support.

According to an embodiment of the present invention, an end face of the second end of the hub part of the drive member has an oil groove in an annular region of contact between the second end of the hub part of the drive member and the flange part of the support, the oil groove extending transversely from a radially inner side of the annular region of contact toward a radially outer side of the annular region of contact and thereby traversing a portion of the annular region of contact, and the oil groove being radially separated from a radially outer edge of the annular region of contact.

According to an embodiment of the present invention, the oil groove is separated from an outer peripheral edge of the end face of the second end of the hub part of the drive member.

According to an embodiment of the present invention, the flange part of the drive member is in sealed connection with the outer wall of the first scroll, so as to form a suction chamber of the scroll compressor, and fluid enters the compression chamber via the suction chamber.

According to an embodiment of the present invention, the drive member comprises at least one fluid channel formed in the flange part of the drive member; the fluid channel has a fluid inlet formed in a surface, facing in the first direction, of the flange part of the drive member, and a fluid outlet formed in a surface, facing in the second direction, of the flange part of the drive member, such that fluid enters the fluid channel through the fluid inlet of the fluid channel, and enters the suction chamber through the fluid outlet.

According to an embodiment of the present invention, the fluid channel extends obliquely relative to an axial direction of the drive member, and the fluid outlet of the fluid channel is farther away from a rotation axis of the drive member than the fluid inlet is.

According to an embodiment of the present invention, if a first plane passes through a rotation axis of the drive member and a point on an axis of the fluid channel, said point being located at the fluid inlet, and a second plane is perpendicular to the first plane and parallel to the rotation axis of the drive member, then an angle between the axis of the fluid channel and the first plane is 0-60 degrees, and an angle between the axis of the fluid channel and the second plane is 5-60 degrees.

According to an embodiment of the present invention, the outer wall has a recess at a position corresponding to the position of the fluid outlet of the fluid channel, the recess being formed on a surface of the outer wall that faces toward a rotation axis of the first scroll; and a wall face of the recess that faces toward the rotation axis of the first scroll is gradually inclined or curved toward the rotation axis of the first scroll in a direction toward the first end plate of the first scroll.

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

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic sectional drawing of a scroll compressor according to an embodiment of the present invention.

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

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

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

FIG. 5 is a schematic perspective drawing of a drive member of a scroll compressor according to a variant example of an embodiment of the present invention.

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

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

FIG. 8 is a schematic top view of a drive member of a scroll compressor according to a variant example of an embodiment of the present invention.

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

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

FIG. 11 is a schematic sectional drawing, taken along line EE in FIG. 8, of the drive member of the scroll compressor shown in FIG. 8.

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

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

FIG. 14 is a schematic top view of a drive member of a scroll compressor according to another variant example of an embodiment of the present invention.

FIG. 15 is a schematic sectional drawing, taken along line JJ in FIG. 14, of the drive member of the scroll compressor shown in FIG. 14.

FIG. 16 is a schematic sectional drawing of a drive member of a scroll compressor according to another variant example of an embodiment of the present invention.

FIG. 17 is a partial enlarged drawing of part S of the drive member of the scroll compressor shown in FIG. 16.

FIG. 18 is a schematic sectional drawing of a drive member of a scroll compressor according to another variant example of an embodiment of the present invention.

FIG. 19 is a schematic sectional drawing of a drive member of a scroll compressor according to a further variant example of an embodiment of the present invention.

FIG. 20 is a schematic exploded perspective drawing of a drive member, thrust bearing and second scroll of a scroll compressor according to a variant example of an embodiment of the present invention.

FIG. 21 is a schematic sectional perspective drawing of the drive member, thrust bearing and second scroll of the scroll compressor shown in FIG. 20.

FIG. 22 is a schematic sectional perspective drawing of a drive member, thrust bearing and second scroll of a scroll compressor according to another variant example of an embodiment of the present invention.

FIG. 23 is a schematic perspective drawing of a sleeve of the drive member of the scroll compressor shown in FIG. 1.

FIG. 24 is a schematic perspective drawing of the drive member, first scroll, second scroll and fixed shaft of the scroll compressor shown in FIG. 1, in an assembled state.

FIG. 25 is a schematic exploded perspective drawing of the drive member, first scroll, second scroll and fixed shaft of the scroll compressor shown in FIG. 24.

FIG. 26 is a schematic sectional drawing of the drive member, first scroll, second scroll and fixed shaft of the scroll compressor shown in FIG. 24.

FIG. 27 is a schematic exploded sectional perspective drawing of the drive member, first scroll, second scroll and fixed shaft of the scroll compressor shown in FIG. 24.

FIG. 28 is a schematic sectional drawing of the drive member, second scroll, fixed shaft and oil lifting bolt of the scroll compressor shown in FIG. 1, in an assembled state.

FIG. 29 is a schematic perspective drawing of the support of the scroll compressor shown in FIG. 1.

FIG. 30 is a schematic sectional drawing of the support of the scroll compressor shown in FIG. 29

FIG. 31 is a schematic sectional drawing of a drive member and second scroll of a scroll compressor according to a variant example of an embodiment of the present invention.

FIG. 32 is a partial enlarged schematic sectional drawing of the part of FIG. 31 associated with the annular protrusion.

FIG. 33 is a schematic sectional drawing of a drive member and second scroll of a scroll compressor according to another variant example of an embodiment of the present invention.

FIG. 34 is a partial enlarged schematic sectional drawing of the part of FIG. 33 associated with the annular protrusion.

FIG. 35 is a schematic sectional drawing of the drive member, first scroll and second scroll of the scroll compressor shown in FIG. 1.

FIG. 36 is a schematic exploded sectional perspective drawing of the drive member, first scroll and second scroll of the scroll compressor shown in FIG. 35.

FIG. 37 is a schematic sectional drawing of a support, fixed shaft, drive member and second scroll of a scroll compressor according to a variant example of an embodiment of the present invention, in an assembled state.

DETAILED DESCRIPTION OF THE INVENTION

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

Referring to FIG. 1, a scroll compressor 100 according to an embodiment of the present invention comprises a first scroll 11 and a second scroll 12. Referring to FIGS. 4-23, a drive member 3 according to an embodiment of the present invention comprises: a hub part 31 with an internal hole 30, the hub part 31 comprising a first end 311 and a second end 312 opposite to each other; and a flange part 32 projecting radially outward from the first end 311 of the hub part 31 of the drive member 3, the drive member 3 being connected to the first scroll 11 by means of the flange part 32. The flange part 32 connects the drive member 3 to the first scroll 11, so as to drive the first scroll 11 to rotate. For example, the flange part 32 comprises a connecting member 130 (FIGS. 25-27), the connecting member 130 connecting the drive member 3 to the first scroll 11, so as to drive the first scroll 11 to rotate; thus, gas generated by rotation of the first scroll 11 can drive the second scroll 12 to rotate therewith. The connecting member 130 may form a single piece with either the first scroll 11 or the drive member 3, or may be a separate connecting member.

Referring to FIG. 5, in an embodiment of the present invention, an end face 3120 of the second end 312 of the hub part 31 of the drive member 3 has an 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 separated from an outer peripheral edge 3121 of the end face 3120 of the second end 312 of the hub part 31 of the drive member 3. The oil groove 56 may be at least one oil groove, or two or more oil grooves distributed so as to be spaced apart at a certain interval (e.g. equidistantly).

Referring to FIGS. 4 and 6, in an embodiment of the present invention, a step part 302 is provided on a hole wall 301 of the internal hole 30 of the hub part 31 of the drive member 3, the step part 302 of the hub part 31 of the drive member 3 having a step face 303 facing in a second direction D2.

Referring to FIGS. 4, 6, 7, 8, 10, 14 and 15, in an embodiment of the present invention, the drive member 3 comprises at least one fluid channel 6 formed in the flange part 32 of the drive member 3; the flange part 32 has 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 has 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 flows out through the fluid outlet 62. The drive member 3 may comprise two fluid channels 6, the two fluid channels 6 being opposite each other in a radial direction of the drive member 3. The fluid channel 6 of the drive member 3 may have a round or elliptical or curved cross section. According to an example of the present invention, as shown in FIGS. 4, 6, 7, 8 and 10, the fluid channel 6 extends obliquely relative to an axial direction of the drive member 3, and the fluid outlet 62 of the fluid channel 6 is farther away from a rotation axis 91 of the drive member 3 than the fluid inlet 61 is. For example, if a first plane passes through the rotation axis 91 of the drive member 3 and a point on an axis 93 of the fluid channel 6, said point being located at the fluid inlet 61, and a second plane is perpendicular to the first plane and parallel to the rotation axis 91 of the drive member 3, then an angle between the axis 93 of the fluid channel 6 and the first plane is 0-60 degrees, and an angle between the axis 93 of the fluid channel 6 and the second plane is 5-60 degrees. According to another example of the present invention, as shown in FIGS. 14 and 15, the fluid channel 6 extends in the axial direction of the drive member 3, i.e. the axis 93 of the fluid channel 6 is parallel to the rotation axis 91 of the drive member 3, an angle between the axis 93 of the fluid channel 6 and the first plane is 0 degrees, and an angle between the axis 93 of the fluid channel 6 and the second plane is also 0 degrees.

Referring to FIGS. 8, 13 and 14, in an embodiment of the present invention, the flange part 32 of the drive member 3 has a drive member connecting hole 323, the drive member connecting hole 323 of the flange part 32 of the drive member 3 having a threaded part 324, and the connecting member 130 (FIGS. 25-27) comprises a bolt 132, the bolt 132 fixedly connecting the first scroll 11 to the drive member 3 via the drive member connecting hole 323.

Referring to FIGS. 2, 4, 8, 12, 14 and 25, in an embodiment of the present invention, the flange part 32 of the drive member 3 has a drive member pin hole 322. An outer wall 111 of the first scroll 11 has a scroll pin hole 114, and the connecting member 130 further comprises: a pin 131, the pin 131 being inserted into the scroll pin hole 114 of the outer wall 111 of the first scroll 11 (FIG. 2) and the drive member pin hole 322 of the flange part 32 of the drive member 3 (FIG. 7), so as to fix the relative positions of the first scroll 11 and the drive member 3.

Referring to FIGS. 8, 11 and 14, in an embodiment of the present invention, the drive member 3 further comprises: a counterweight hole 325 formed in the flange part 32, the counterweight hole 325 being used to make the drive member 3 dynamically balanced. The counterweight hole may be a blind hole, which extends from the second surface 320 of the flange part 32 toward the first surface 321 of the flange part 32. Referring to FIG. 19, in a variant example of an embodiment of the present invention, the drive member 3 has no counterweight hole 325.

Referring to FIGS. 4, 6, 7, 8, 11, 35, 36 and 37, in an embodiment of the present invention, the drive member 3 further comprises: an eccentric ring hole 326 formed in the flange part 32, an eccentric ring 341 (see FIGS. 25, 27, 35, 36 and 37) being disposed in the eccentric ring hole 326, and a coupling pin 342 being inserted into a coupling pin hole 126 formed in the second end plate 123 of the second scroll 12 (FIG. 3) and a hole 3410 of the eccentric ring 341 (see FIGS. 25, 27, 35, 36 and 37). The drive member 3 may have three eccentric ring holes 326.

Referring to FIGS. 16 and 17, in an embodiment of the present invention, the drive member 3 further comprises: an annular protrusion 326 projecting from the surface 320 of the flange part 32 of the drive member 3 at an edge of the flange part 32, and an annular groove 327 formed on an inner peripheral face of the annular protrusion 326. An O-shaped sealing ring may be placed in the annular groove 327, thereby sealing a gap between the outer wall 111 of the first scroll 11 and the annular protrusion 326 of the drive member 3, see FIGS. 1 and 24-27.

Referring to FIGS. 31-34, in an embodiment of the present invention, the drive member 3 further comprises an annular protrusion 73 protruding from the surface 320 of the flange part 32, the annular protrusion 73 having an annular wedge-shaped protrusion portion 731, a cross section of the wedge-shaped protrusion portion 731 in a radial direction having a wedge shape, and the wedge-shaped protrusion portion 731 having a wedge-shaped protrusion surface 7310 facing axially outward. In a cross section in a radial direction, an axial distance between the first wedge-shaped protrusion point P1, in a radial direction, of the wedge-shaped protrusion surface 7310 and the surface 320 is largest, and an axial distance between the second wedge-shaped protrusion point P2 in a radial direction and the surface 320 is zero; and at least a portion of the wedge-shaped protrusion surface 7310, corresponding to the first wedge-shaped protrusion point P1, is within an annular region of the surface 320 of the flange part 32 of the drive member 3, said annular region being used to support the surface 1230 of the second end plate 123 of the second scroll 12. For example, at least a portion of the wedge-shaped protrusion surface 7310, corresponding to the first wedge-shaped protrusion point P1, is within an annular region of contact between the second end plate 123 of the second scroll 12 and the flange part 32 of the drive member 3. For example, a portion of the wedge-shaped protrusion surface 7310, corresponding to the first wedge-shaped protrusion point P1, and most or all of the remainder of the wedge-shaped protrusion surface 7310, are located within an annular region of the surface 320 of the flange part 32 of the drive member 3, said annular region being used to support the surface 1230 of the second end plate 123 of the second scroll 12. For example, a portion of the wedge-shaped protrusion surface 7310, corresponding to the first wedge-shaped protrusion point P1, and most or all of the remainder of the wedge-shaped protrusion surface 7310, are located within an annular region of contact between the second end plate 123 of the second scroll 12 and the flange part 32 of the drive member 3. According to an example of the present invention, at the first wedge-shaped protrusion point P1, an axial distance between the wedge-shaped protrusion surface 7310 and the surface 320 is within the range of 0.1 microns-1 millimeter, or within the range of 20 microns-40 microns. The first wedge-shaped protrusion point PI may be at a radially outer side of the second wedge-shaped protrusion point P2, or the first wedge-shaped protrusion point P1 may be at a radially inner side of the second wedge-shaped protrusion point P2.

Referring to FIGS. 31-34, in an embodiment of the present invention, the annular protrusion 73 also has an annular transitional protrusion portion 732, the transitional protrusion portion 732 having a transitional protrusion surface 7320 facing axially outward; in a cross section in a radial direction, the transitional protrusion surface 7320 extends from a point on the wedge-shaped protrusion surface 7310, corresponding to the first wedge-shaped protrusion point P1, to the surface 320 by extending away from the second wedge-shaped protrusion point P2 and toward the surface 320. A cross section of the transitional protrusion portion 732 in a radial direction may have a wedge shape. A dimension of the transitional protrusion portion 732 in a radial direction may be smaller than a dimension of the wedge-shaped protrusion portion 731 in a radial direction.

Referring to FIGS. 4 and 6, in an embodiment of the present invention, the internal hole 30 of the hub part 31 has an internal hole portion located at the first end 311, a hole wall of the internal hole portion being provided with a recess 306. As shown in FIG. 23, a sleeve 9 for the drive member comprises: a tubular body 94, and a protrusion 96 protruding radially outward from an outer peripheral face 95 of the tubular body. The protrusion 96 has a surface 961 facing radially outward, and the surface 961 may be a convex face. The protrusion 96 is wedge-shaped in the axial direction, such that a dimension of the protrusion 96 in a radial direction gradually decreases in the direction from one end 97 to another end 98 of the tubular body 94. The sleeve 9 is disposed in the internal hole portion of the hub part 31, and the protrusion 96 of the sleeve 9 is mated in the recess 306 in the hole wall of the internal hole portion of the hub part 31. A bearing bush acting as a first bearing 51 is disposed in the tubular body 94. Referring to FIG. 18, in another embodiment of the present invention, the hole wall of the internal hole portion has no recess 306, and the sleeve 9 correspondingly has no protrusion 96.

Referring to FIG. 1, a scroll compressor 100 according to an embodiment of the present invention comprises: the first scroll 11, the second scroll 12, a support 4, an electric motor 7 and the drive member 3. The first scroll 11 comprises a first end plate 112, and a first scroll wrap 113 projecting from the first end plate 112 in a first direction D1. The second scroll 12 comprises a second end plate 123, and a second scroll wrap 124 projecting from the second end plate 123 in the 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 support 4 is located at a side of the second scroll 12 that is remote from the first scroll 11. The drive member 3 is rotatably mounted to the support 4 and located at the side of the second scroll 12 that is remote from the first scroll 11; the electric motor 7 drives the first scroll 11 to rotate about the rotation axis 91 by means of the drive member 3 (FIGS. 4, 6, 9-13, 15, 16 and 27), and the first scroll 11 drives the second scroll 12 to rotate about a rotation axis 92 (FIG. 27). The rotation axis 91 is a rotation axis or axis of the drive member 3 (FIGS. 4, 6, 9-13, 15 and 16). The rotation axis 91 and the rotation axis 92 are parallel and spaced apart. The drive member 3 comprises: the hub part 31 with the internal hole 30, the hub part 31 comprising the first end 311 and the second end 312 opposite each other; and the flange part 32 projecting radially outward from the first end 311 of the hub part 31 of the drive member 3, the drive member 3 being connected to the first scroll 11 by means of the flange part 32. The electric motor 7 drives the first scroll 11 to rotate by means of the hub part 31 of the drive 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 comprises a housing 101, and the housing 101 may comprise 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; the first scroll 11, the second scroll 12, the support 4, the electric motor 7 and the drive member 3, etc. are disposed in the housing 101. The second housing 1012 and the third housing 1013 define a gas discharge chamber. The support 4 may be fixed to the first housing 1011; for example, the support 4 is welded to the first housing 1011, the support 4 is fixed to the first housing 1011 by interference fit with the first housing 1011, or the support 4 is fixed to the first housing 1011 by a bolt. One end of the support 4 may be fixed to the bottom of the housing 101 or the bottom of the first housing 1011.

Referring to FIGS. 1 and 2, in an embodiment of the present invention, the first scroll 11 further comprises the outer wall 111 projecting from the first end plate 112 in the first direction D1, the outer wall 111 being at a radially outer side of the first scroll wrap 113 and the second scroll 12, and the outer wall 111 being provided with the connecting member 130 (FIGS. 24-27), the drive member 3 being connected to the first scroll 11 by means of the connecting member 130 (FIGS. 24-27). The outer wall 111 may have an annular shape.

Referring to FIGS. 1 and 24-30, in an embodiment of the present invention, the scroll compressor 100 further comprises: a fixed shaft 5, the fixed shaft 5 being fixed to the support 4. The drive member 3 is rotatably mounted to the support 4 by having the hub part 31 of the drive member 3 rotatably mounted on the fixed shaft 5. Referring to FIGS. 1, 2-28 and 31-34, in an embodiment of the present invention, the second end plate 123 of the second scroll 12 is rotatably supported on the flange part 32 of the drive member 3. According to an example of the present invention, referring to FIGS. 2, 4, 8, 10, 12, 14 and 25-27, the outer wall 111 of the first scroll 11 has the scroll pin hole 114 (FIG. 2), and the flange part 32 of the drive member 3 has the drive member pin hole 322 (FIGS. 4, 8, 12 and 14). The outer wall 111 of the first scroll 11 has a scroll connecting hole 116 (FIGS. 25, 26 and 27), the flange part 32 of the drive member 3 has the drive member connecting hole 323 (FIGS. 8, 13, 14 and 26-27), either the drive member connecting hole 323 of the flange part 32 of the drive member 3 or the scroll connecting hole 116 of the outer wall 111 of the first scroll 11 has a threaded part 324, the connecting member 130 (FIGS. 25-27) comprises: the pin 131 and the bolt 132, the pin 131 is inserted into the scroll pin hole 114 of the outer wall 111 of the first scroll 11 (FIG. 2) and the drive member pin hole 322 of the flange part 32 of the drive member 3 (FIGS. 4, 8, 12 and 14), so as to fix the relative positions of the first scroll 11 and the drive member 3, and the bolt 132 fixedly connects the first scroll 11 to the drive member 3 via the scroll connecting hole 116 (FIGS. 25-27) and the drive member connecting hole 323.

Referring to FIGS. 1 and 26-28, in an embodiment of the present invention, the scroll compressor 100 further comprises: the first bearing 51 and/or a second bearing 52. The first end 311 of the hub part 31 is mounted on the fixed shaft 5 by means of the first bearing 51, and the second end 312 of the hub part 31 is mounted on the fixed shaft 5 by means of the second bearing 52. Referring to FIGS. 1 and 26-28, in an embodiment of the present invention, the second scroll 12 further comprises a hub part 121 projecting from the second end plate 123 in the first direction D1; and referring to FIGS. 1 and 28, the fixed shaft 5 has an axial internal hole 50. The scroll compressor 100 further comprises a third bearing 53, and the hub part 121 of the second scroll 12 is mounted in the axial internal hole 50 of the fixed shaft 5 by means of the third bearing 53.

Referring to FIGS. 1, 4, 6 and 28, in an embodiment of the present invention, the step part 302 is provided on the hole wall 301 of the internal hole 30 of the hub part 31 of the drive member 3, the step part 302 of the hub part 31 of the drive member 3 having the step face 303 facing in the second direction D2; the fixed shaft 5 has a step part 501, the step part 501 of the fixed shaft 5 having a step face 502 facing in the first direction D1; the scroll compressor 100 further comprises a first thrust bearing 54, the first thrust bearing 54 being disposed between the step face 303 of the step part 302 of the hub part 31 of the drive member 3 and the step face 502 of the step part 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 metal or non-metal material, or the first thrust bearing 54 may be a ball thrust bearing, a roller thrust bearing, etc.

Referring to FIGS. 1, 29 and 30, in an embodiment of the present invention, the support 4 comprises: a tubular part 41, and a flange part 42 projecting radially from the tubular part 41 of the support 4, the second end 312 of the hub part 31 of the drive member 3 being supported on the flange part 42 of the support 4. According to an example of the present invention, a portion of the fixed shaft 5 is inserted into the tubular part 41 of the support 4 and fixed to the tubular part 41 of the support 4, and the fixed shaft 5 has a tubular shape.

Referring to FIGS. 20-22, in an embodiment of the present invention, the scroll compressor 100 further comprises: a second thrust bearing 55, disposed between the second end plate 123 of the second scroll 12 and the flange part 32 of the drive member 3. Specifically, the surface 320 of the flange part 32 of the drive member 3 has an annular groove 3201. In the embodiment shown in FIGS. 20 and 21, the groove 3201 is deeper, whereas in the embodiment shown in FIG. 22, the groove 3201 is shallower. The second thrust bearing 55′ is disposed in the groove 3201, and is in contact with the surface 1230 of the second end plate 123 of the second scroll 12. The groove 3201 is disposed at an inner side, in a radial direction, of the eccentric ring hole 326 in the flange part 32.

Referring to FIGS. 1 and 5, in an embodiment of the present invention, the end face 3120 of the second end 312 of the hub part 31 of the drive member 3 has the oil groove 56 in an annular region of contact between the second end 312 of the hub part 31 of the drive member 3 and the flange part 42 of the support 4, the oil groove 56 extending transversely from a radially inner side of the annular region of contact toward a radially outer side of the annular region of contact and thereby traversing a portion of the annular region of contact, and the oil groove 56 being radially separated from a radially outer edge of the annular region of contact. The oil groove 56 may extend in a radial direction. According to an example of the present invention, the oil groove 56 is separated from the outer peripheral edge 3121 of the end face 3120 of the second end 312 of the hub part 31 of the drive member 3. The oil groove 56 may also be formed on a surface 420 of the flange part 42 of the support 4. The oil groove 56 may be at least one oil groove, or two or more oil grooves distributed so as to be spaced apart at a certain interval (e.g. equidistantly).

Referring to FIG. 1, in an alternative embodiment of the present invention, the scroll compressor 100 further comprises: a third thrust bearing, disposed between the second end 312 of the hub part 31 of the drive member 3 and the flange part 42 of the support 4. The third thrust bearing may be any suitable existing thrust bearing. For example, the third thrust bearing may be an annular thrust washer made of a wear-resistant metal or non-metal material, or the third thrust bearing may be a ball thrust bearing, a roller thrust bearing, etc.

Referring to FIG. 1, in an embodiment of the present invention, the electric motor 7 may be an axial flux electric motor or a radial flux electric motor. In an embodiment, the electric motor 7 comprises a rotor 71, and a stator 72 fixed to the support 4, and the rotor 71 of the electric motor 7 drives the first scroll 11 to rotate by driving the drive member 3 to rotate. The rotor 71 of the electric motor 7 is disposed at a side of the stator 72 that faces in the first direction D1 or the second direction D2.

Referring to FIGS. 1, 2, 4, 6-10, 14, 15 and 24-26, in an embodiment of the present invention, the flange part 32 of the drive member 3 is in sealed connection with the outer wall 111 of the first scroll 11, so as to form a suction chamber 88 of the scroll compressor 100, and fluid enters the compression chamber via the suction chamber 88. Referring to FIGS. 1, 4, 6-10, 14 and 15, the drive member 3 comprises at least one fluid channel 6 formed in the flange part 32 of the drive member 3; the fluid channel 6 has the fluid inlet 61 formed in the surface 321, facing in the first direction D1, of the flange part 32 of the drive member 3, and the fluid outlet 62 formed in the surface 320, facing in the second direction D2, of the flange part 32 of the drive member 3, such that fluid enters the fluid channel 6 through the fluid inlet 61 of the fluid channel 6, and enters the suction chamber 88 through the fluid outlet 62. The drive member 3 may comprise two fluid channels 6, the two fluid channels 6 being opposite each other in a radial direction of the drive member 3. The fluid channel 6 of the drive member 3 may have a round cross section. According to an example of the present invention, as shown in FIGS. 4 and 6-10, the fluid channel 6 extends obliquely relative to the axial direction of the drive member 3, and the fluid outlet 62 of the fluid channel 6 is farther away from the rotation axis 91 of the drive member 3 than the fluid inlet 61 is. For example, if a first plane passes through the rotation axis 91 of the drive member 3 and a point on an axis 93 of the fluid channel 6, said point being located at the fluid inlet 61, and a second plane is perpendicular to the first plane and parallel to the rotation axis 91 of the drive member 3, then an angle between the axis 93 of the fluid channel 6 and the first plane is 0-60 degrees, and an angle between the axis 93 of the fluid channel 6 and the second plane is 5-60 degrees. According to another example of the present invention, as shown in FIGS. 14 and 15, the fluid channel 6 extends in the axial direction of the drive member 3, i.e. the axis 93 of the fluid channel 6 is parallel to the rotation axis 91 of the drive member 3, an angle between the axis 93 of the fluid channel 6 and the first plane is 0 degrees, and an angle between the axis 93 of the fluid channel 6 and the second plane is also 0 degrees.

Referring to FIGS. 1 and 2, in an 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 channel 6, the recess 1110 being formed on a surface 1111 of the outer wall 111 that faces toward the rotation axis of the first scroll 11; and a wall face 11101 of the recess 1110 that faces toward 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 comprises: an oil lifting bolt 81, the oil lifting bolt 81 being accommodated in the internal hole 50 of the fixed shaft 5, and having one end located in an oil pool at the bottom of the housing 101, and another end fixedly connected to the hub part 121 of the second scroll 12. The scroll compressor 100 may also comprise any other suitable pump.

Referring to FIGS. 31-34, in an embodiment of the present invention, the scroll compressor 100 further comprises the annular protrusion 73 protruding from the surface 320 of the flange part 32 of the drive member 3, the annular protrusion 73 having the annular wedge-shaped protrusion portion 731, a cross section of the wedge-shaped protrusion portion 731 in a radial direction having a wedge shape, and the wedge-shaped protrusion portion 731 having the wedge-shaped protrusion surface 7310 facing axially outward. In a cross section in a radial direction, an axial distance between the first wedge-shaped protrusion point P1, in a radial direction, of the wedge-shaped protrusion surface 7310 and the surface 320 is largest, and an axial distance between the second wedge-shaped protrusion point P2 in a radial direction and the surface 320 is zero; and at least a portion of the wedge-shaped protrusion surface 7310, corresponding to the first wedge-shaped protrusion point P1, is within an annular region of the surface 320 of the flange part 32 of the drive member 3, said annular region being used to support the surface 1230 of the second end plate 123 of the second scroll 12. For example, at least a portion of the wedge-shaped protrusion surface 7310, corresponding to the first wedge-shaped protrusion point P1, is within an annular region of contact between the second end plate 123 of the second scroll 12 and the flange part 32 of the drive member 3. For example, a portion of the wedge-shaped protrusion surface 7310, corresponding to the first wedge-shaped protrusion point P1, and most or all of the remainder of the wedge-shaped protrusion surface 7310, are located within an annular region of the surface 320 of the flange part 32 of the drive member 3, said annular region being used to support the surface 1230 of the second end plate 123 of the second scroll 12. For example, a portion of the wedge-shaped protrusion surface 7310, corresponding to the first wedge-shaped protrusion point P1, and most or all of the remainder of the wedge-shaped protrusion surface 7310, are located within an annular region of contact between the second end plate 123 of the second scroll 12 and the flange part 32 of the drive member 3. According to an example of the present invention, at the first wedge-shaped protrusion point P1, an axial distance between the wedge-shaped protrusion surface 7310 and the surface 320 is within the range of 0.1 microns-1 millimeter, or within the range of 20 microns-40 microns. The first wedge-shaped protrusion point PI may be at a radially outer side of the second wedge-shaped protrusion point P2, or the first wedge-shaped protrusion point PI may be at a radially inner side of the second wedge-shaped protrusion point P2. The annular protrusion 73 may also be disposed on the surface 1230 of the second end plate 123 of the second scroll 12.

Referring to FIGS. 31-34, in an embodiment of the present invention, the annular protrusion 73 also has the annular transitional protrusion portion 732, the transitional protrusion portion 732 having the transitional protrusion surface 7320 facing axially outward; in a cross section in a radial direction, the transitional protrusion surface 7320 extends from a point on the wedge-shaped protrusion surface 7310, corresponding to the first wedge-shaped protrusion point P1, to the surface 320 by extending away from the second wedge-shaped protrusion point P2 and toward the surface 320. A cross section of the transitional protrusion portion 732 in a radial direction may have a wedge shape. A dimension of the transitional protrusion portion 732 in a radial direction may be smaller than a dimension of the wedge-shaped protrusion portion 731 in a radial direction.

When the compressor 100 is operating, referring to FIG. 1, the electric motor 7 drives the first scroll 11 to rotate by means of the drive member 3, and the first scroll 11 drives the second scroll 12 to rotate. Refrigerant enters the sealed space formed by the first housing 1011 and second housing 1012 of the housing 101 through an inlet 82; a portion of refrigerant flows upward, around an upper end of a tubular baffle 83, and then downward, and enters the fluid channel 6 via the fluid inlet 61 of the fluid channel 6 (see FIGS. 4, 6-8, 10, 14 and 15), and another portion of refrigerant flows downward, enters the electric motor 7 below a lower end of the tubular baffle 83 so as to cool the electric motor, and then flows upward, and enters the fluid channel 6 via the fluid inlet 61 of the fluid channel 6. All of the refrigerant enters the compression chamber formed by the second scroll wrap 124 and the first scroll wrap 113 via the suction chamber 88, and compressed refrigerant is discharged through an outlet 84. Referring to

FIGS. 4, 6-8 and 10, if the fluid channel 6 extends obliquely relative to the axial direction of the drive member 3, then refrigerant entering the fluid channel 6 through the fluid inlet 61 of the fluid channel 6 undergoes primary compression due to centrifugal force, and then enters the compression chamber formed by the second scroll wrap 124 and the first scroll wrap 113 via the suction chamber 88 to undergo secondary compression. At the same time, the second scroll 12 drives the oil lifting bolt 81 disposed in the axial internal hole 50 of the fixed shaft 5 to rotate, sucking lubricating oil contained in an oil sump at the bottom of the first housing 1011 of the housing 101 into the axial internal hole 50 of the fixed shaft 5, and a first portion of lubricating oil flows through a transverse through-hole 85 (e.g. a radial through-hole) in the fixed shaft 5 to the second bearing 52 and between the second end 312 of the hub part 31 of the drive member 3 and the flange part 42 of the support 4 (see FIG. 1). A second portion of lubricating oil enters a gap between the hub part 121 of the second scroll 12 and the third bearing 53 so as to lubricate the third bearing 53; a portion of the lubricating oil entering the gap between the hub part 121 of the second scroll 12 and the third bearing 53 enters a gap between the second end plate 123 of the second scroll 12 and the flange part 32 of the drive member 3, and finally enters a space formed by the first scroll 11 and the second scroll 12 via the fluid channel 6, so as to lubricate the first scroll 11 and the second scroll 12. Another portion of the lubricating oil entering the gap between the hub part 121 of the second scroll 12 and the third bearing 53 flows around an upper end of the third bearing 53 and partly enters the first bearing 51, and partly enters an oil return channel 862 formed in the fixed shaft 5, and then enters an oil return channel 861 formed in the fixed shaft 5 via a connecting hole 89, finally returning into the oil sump at the bottom of the first housing 1011 of the housing 101. The lubricating oil entering the first bearing 51 enters the oil return channel 862 via a transverse through-hole 87 (e.g. a radial through-hole), then enters the oil return channel 861 via the connecting hole 89, finally returning into the oil sump at the bottom of the first housing 1011 of the housing 101.

In the scroll compressor according to an embodiment of the present invention, compression efficiency is increased because the first scroll and the second scroll rotate together, each about its own rotation axis. Furthermore, an axial flux electric motor may be used, so the axial dimension of the electric motor can be reduced, thereby making the compressor structure more compact. In addition, due to the structural design of the drive member, the first scroll may be driven to rotate by the drive member, and the first scroll drives the second scroll to rotate; thus, it is additionally possible to have all of the bearings disposed at the same side of the compressor, for example at the same side of the second scroll in the first direction D1, and the compressor structure can thus be made even more compact. Moreover, the drive member design of the drive member 3 enables the scroll compressor to have secondary compression.

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

Claims

1. A drive member for a scroll compressor, the scroll compressor comprising a first scroll and a second scroll, the drive member comprising:

a hub part with an internal hole, the hub part comprising a first end and a second end opposite each other; and

a flange part projecting radially outward from the first end of the hub part of the drive member, wherein the flange part connects the drive member to the first scroll of the scroll compressor, so as to drive the first scroll to rotate, wherein the first scroll drives the second scroll to rotate.

2. The drive member as claimed in claim 1, wherein:

the flange part comprises a connecting member, for connecting the drive member to the first scroll of the scroll compressor.

3. The drive member as claimed in claim 1, wherein:

an end face of the second end of the hub part of the drive member has an oil groove.

4. The drive member as claimed in claim 3, wherein:

the oil groove is separated from an outer peripheral edge of the end face of the second end of the hub part of the drive member.

5. The drive member as claimed in claim 4, wherein:

the oil groove extends in a radial direction.

6. The drive member as claimed in claim 1, wherein:

a step part is provided on a hole wall of the internal hole of the hub part, the step part of the hub part having a step face.

7. The drive member as claimed in claim 1, further comprising:

at least one fluid channel formed in the flange part, the flange part having a first surface facing in a direction from the first end to the second end, and a second surface facing in a direction from the second end to the first end, the fluid channel having a fluid inlet formed in the first surface, and a fluid outlet formed in the second surface, such that fluid enters the fluid channel through the fluid inlet of the fluid channel, and flows out through the fluid outlet.

8. The drive member as claimed in claim 7, wherein:

the fluid channel extends in an axial direction of the drive member.

9. The drive member as claimed in claim 7, wherein:

the fluid channel extends obliquely relative to an axial direction of the drive member, and the fluid outlet of the fluid channel is farther away from an axis of the drive member than the fluid inlet is.

10. The drive member as claimed in claim 9, wherein:

if a first plane passes through a rotation axis of the drive member and a point on an axis of the fluid channel, said point being located at the fluid inlet, and if a second plane is perpendicular to the first plane and parallel to the rotation axis of the drive member, an angle between the axis of the fluid channel and the first plane is 0-60 degrees, and an angle between the axis of the fluid channel and the second plane is 5-60 degrees.

11. The drive member as claimed in claim 7, wherein:

the drive member comprises two fluid channels, the two fluid channels being opposite each other in a radial direction of the drive member.

12. The drive member as claimed in claim 7, wherein:

the fluid channel of the drive member has a round or elliptical or curved cross section.

13. The drive member as claimed in claim 1, wherein:

the flange part has a drive member connecting hole, the drive member connecting hole having a threaded part, for fixedly connecting the drive member to the first scroll by means of a bolt.

14. The drive member as claimed in claim 1, further comprising:

a counterweight hole formed in the flange part, for making the drive member dynamically balanced.

15. The drive member as claimed in claim 14, wherein:

the flange part has a first surface facing in a direction from the first end to the second end, and a second surface facing in a direction from the second end to the first end, and the counterweight hole is a blind hole, which extends from the second surface of the flange part toward the first surface of the flange part.

16. The drive member as claimed in claim 1, further comprising:

an annular protrusion protruding from a surface of the flange part, the annular protrusion having an annular wedge-shaped protrusion portion, a cross section of the wedge-shaped protrusion portion in a radial direction having a wedge shape, and the wedge-shaped protrusion portion having a wedge-shaped protrusion surface facing axially outward; in a cross section in a radial direction, an axial distance between a first wedge-shaped protrusion point, in a radial direction, of the wedge-shaped protrusion surface and said surface of the flange part is largest, and an axial distance between a second wedge-shaped protrusion point in a radial direction and said surface of the flange part is zero; and at least a portion of the wedge-shaped protrusion surface, corresponding to the first wedge-shaped protrusion point, is within an annular region of said surface of the flange part of the drive member, said annular region being used to support said surface of the second end plate of the second scroll.

17. The drive member as claimed in claim 16, wherein:

at the first wedge-shaped protrusion point, an axial distance between the wedge-shaped protrusion surface and said surface of the flange part is within a range of 20 microns-40 microns; or is within a range of 0.1 microns-1 millimeter.

18. The drive member as claimed in claim 16, wherein:

the first wedge-shaped protrusion point is at a radially outer side of the second wedge-shaped protrusion point, or is at a radially inner side of the second wedge-shaped protrusion point.

19. The drive member as claimed in claim 16, wherein:

the annular protrusion also has an annular transitional protrusion portion, the transitional protrusion portion having a transitional protrusion surface facing axially outward;

in a cross section in a radial direction, the transitional protrusion surface extends from a point on the wedge-shaped protrusion surface, corresponding to the first wedge-shaped protrusion point, to said surface of the flange part by extending away from the second wedge-shaped protrusion point and toward said surface of the flange part.

20. The drive member as claimed in claim 19, wherein:

a cross section of the transitional protrusion portion in a radial direction has a wedge shape.

21. The drive member as claimed in claim 20, wherein

a dimension of the transitional protrusion portion in a radial direction is smaller than a dimension of the wedge-shaped protrusion portion in a radial direction.

22. A scroll compressor, comprising:

a first scroll, comprising a first end plate and a first scroll wrap projecting from the first end plate in a first direction (D1);

a second scroll, comprising a second end plate and a second scroll wrap projecting from the second end plate in a second direction (D2) opposite to the first direction, the second scroll wrap and the first scroll wrap cooperating to form a compression chamber for compressing a medium;

a support, located at a side of the second scroll that is remote from the first scroll;

an electric motor; and

the drive member as claimed in claim 1, the drive member being rotatably mounted to the support and located at the side of the second scroll that is remote from the first scroll, the drive member comprising: a hub part with an internal hole, the hub part comprising a first end and a second end opposite each other; and a flange part projecting radially outward from the first end of the hub part of the drive member, the drive member being connected to the first scroll by means of the flange part, the electric motor driving through the hub part of the drive member the first scroll to rotate, and the first scroll driving the second scroll to rotate.

23. The scroll compressor as claimed in claim 22, wherein

the first scroll further comprises an outer wall projecting from the first end plate in the first direction, the outer wall being at a radially outer side of the first scroll wrap and the second scroll, and the outer wall being provided with a connecting member, the drive member being connected to the first scroll by means of the connecting member.

24. The scroll compressor as claimed in claim 23, wherein

the outer wall has an annular shape.

25. The scroll compressor as claimed in claim 22, further comprising:

a fixed shaft fixed to the support,

the drive member being rotatably mounted to the support by having the hub part of the drive member rotatably mounted on the fixed shaft.

26. The scroll compressor as claimed in claim 22, wherein:

the second end plate of the second scroll is rotatably supported on the flange part of the drive member.

27. The scroll compressor as claimed in claim 25, further comprising:

a first bearing, the first end of the hub part being mounted on the fixed shaft by means of the first bearing; and/or

a second bearing, the second end of the hub part being mounted on the fixed shaft by means of the second bearing.

28. The scroll compressor as claimed in claim 25, wherein:

a step part is provided on a hole wall of the internal hole of the hub part of the drive member, the step part of the hub part of the drive member having a step face facing in the second direction,

the fixed shaft has a step part, the step part of the fixed shaft having a step face facing in the first direction,

the scroll compressor further comprises a first thrust bearing, the first thrust bearing being disposed between the step face of the step part of the hub part of the drive member and the step face of the step part of the fixed shaft.

29. The scroll compressor as claimed in claim 25, wherein

the support comprises: a tubular part, and a flange part projecting radially from the tubular part of the support, the second end of the hub part of the drive member being supported on the flange part of the support.

30. The scroll compressor as claimed in claim 29, wherein

an end face of the second end of the hub part of the drive member has an oil groove in an annular region of contact between the second end of the hub part of the drive member and the flange part of the support, the oil groove extending transversely from a radially inner side of the annular region of contact toward a radially outer side of the annular region of contact and thereby traversing a portion of the annular region of contact, and the oil groove being radially separated from a radially outer edge of the annular region of contact.

31. The scroll compressor as claimed in claim 30, wherein

the oil groove is separated from an outer peripheral edge of the end face of the second end of the hub part of the drive member.

32. The scroll compressor as claimed in claim 24, wherein:

the flange part of the drive member is in sealed connection with the outer wall of the first scroll, so as to form a suction chamber of the scroll compressor, and fluid enters the compression chamber via the suction chamber.

33. The scroll compressor as claimed in claim 32, wherein:

the drive member comprises at least one fluid channel formed in the flange part of the drive member; the fluid channel has a fluid inlet formed in a surface, facing in the first direction, of the flange part of the drive member, and a fluid outlet formed in a surface, facing in the second direction, of the flange part of the drive member, such that fluid enters the fluid channel through the fluid inlet of the fluid channel, and enters the suction chamber through the fluid outlet.

34. The scroll compressor as claimed in claim 33, wherein:

the fluid channel extends obliquely relative to an axial direction of the drive member, and the fluid outlet of the fluid channel is farther away from a rotation axis of the drive member than the fluid inlet is.

35. The scroll compressor as claimed in claim 34, wherein:

if a first plane passes through a rotation axis of the drive member and a point on an axis of the fluid channel, said point being located at the fluid inlet, and a second plane is perpendicular to the first plane and parallel to the rotation axis of the drive member, then an angle between the axis of the fluid channel and the first plane is 0-60 degrees, and an angle between the axis of the fluid channel and the second plane is 5-60 degrees.

36. The scroll compressor as claimed in claim 34, wherein:

the outer wall has a recess at a position corresponding to the position of the fluid outlet of the fluid channel, the recess being formed on a surface of the outer wall that faces toward a rotation axis of the first scroll; and a wall face of the recess that faces toward the rotation axis of the first scroll is gradually inclined or curved toward the rotation axis of the first scroll in a direction toward the first end plate of the first scroll.