TECHNICAL FIELD
Embodiments of the present invention relate to a 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 protruding from the end plate. The orbiting scroll has an end plate and an orbiting scroll wrap protruding from the end plate of the orbiting scroll. The orbiting scroll wrap and the fixed scroll wrap cooperate to form a compression cavity for compressing a medium. A motor drives, through a drive shaft, the orbiting scroll to orbit, in order to compress the medium in the compression cavity.
SUMMARY
It is an object of the embodiments of the present invention to provide a scroll compressor, thereby, for example, improving the performance of the scroll compressor.
An embodiment of the present invention provides a scroll compressor including: a first scroll including a first end plate and a first scroll wrap protruding from the first end plate along a first direction; a second scroll including a second end plate and a second scroll wrap protruding from the second end plate along a second direction opposite to the first direction, the second scroll wrap and the first scroll wrap cooperating to form a compression cavity for compressing a medium; a support located on a side of the second scroll away from the first scroll; a motor; and a driving member rotatably supported by the support and located on the 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.
According to an embodiment of the present invention, the scroll compressor further includes: a connecting member connecting the first scroll to the driving member.
According to an embodiment of the present invention, the first scroll further includes an outer wall protruding from the first end plate along the first direction, the outer wall is on a radially outer side of the first scroll wrap and the second scroll, the outer wall is provided with the connecting member, and the driving member is connected to the first scroll through 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 driving member includes: a hub portion having an inner hole, the hub portion including a first end and a second end opposite to each other; and a flange portion protruding radially outwards from the first end of the hub portion of the driving member, the driving member being connected to the first scroll through the flange portion.
According to an embodiment of the present invention, the scroll compressor further includes: a fixed shaft fixed to the support, the driving member being rotatably mounted to the support by rotatably mounting the hub portion of the driving member to the fixed shaft.
According to an embodiment of the present invention, the second end plate of the second scroll is rotatably supported by the flange portion of the driving member.
According to an embodiment of the present invention, all bearings of the scroll compressor are disposed on a side of the second end plate of the second scroll facing the first direction.
According to an embodiment of the present invention, the scroll compressor further includes: a first bearing, the first end of the hub portion being mounted to the fixed shaft through the first bearing; and/or a second bearing, the second end of the hub portion being mounted to the fixed shaft through the second bearing.
According to an embodiment of the present invention, the second scroll further includes a hub portion protruding from the second end plate along the first direction, the fixed shaft has an axial inner hole, the scroll compressor further includes a third bearing, the hub portion of the second scroll being mounted in the axial inner hole of the fixed shaft through the third bearing.
According to an embodiment of the present invention, a hole wall of the inner hole of the hub portion of the driving member has a stepped portion, and the stepped portion of the hub portion of the driving member has a stepped surface facing the second direction, the fixed shaft has a stepped portion, and the stepped portion of the fixed shaft has a stepped surface facing the first direction, the scroll compressor further includes a first thrust bearing, the first thrust bearing being disposed between the stepped surface of the stepped portion of the hub portion of the driving member and the stepped surface of the stepped portion of the fixed shaft.
According to an embodiment of the present invention, the support includes: a cylindrical portion, and a flange portion radially protruding from the cylindrical portion of the support, the second end of the hub portion of the driving member being supported by the flange portion of the support.
According to an embodiment of the present invention, a part of the fixed shaft is inserted into the cylindrical portion of the support and fixed to the cylindrical portion of the support, and the fixed shaft has a cylindrical shape.
According to an embodiment of the present invention, a surface of the second end plate of the second scroll has a first oil groove on an annular contact area between the second end plate of the second scroll and the flange portion of the driving member, the first oil groove extends transversely across a part of the annular contact area from a radially inner side of the annular contact area towards a radially outer side of the annular contact area, and the first oil groove is spaced radially from a radially outer edge of the annular contact area.
According to an embodiment of the present invention, the first oil groove extends along a radial direction.
According to an embodiment of the present invention, an annular recess is formed on the surface of the second end plate of the second scroll, the annular recess is on the radially inner side of the annular contact area, and the first oil groove extends transversely from a radially outer edge of the annular recess towards the radially outer side of the annular contact area and communicates with the annular recess.
According to an embodiment of the present invention, the scroll compressor further includes: a second thrust bearing disposed between the second end plate of the second scroll and the flange portion of the driving member.
According to an embodiment of the present invention, one of an end surface of the second end of the hub portion of the driving member and a surface of the flange portion of the support has a second oil groove on an annular contact area between the second end of the hub portion of the driving member and the flange portion of the support, the second oil groove extends transversely across a part of the annular contact area from a radially inner side of the annular contact area towards a radially outer side of the annular contact area, and the second oil groove is spaced radially from a radially outer edge of the annular contact area.
According to an embodiment of the present invention, the second oil groove extends along a radial direction.
According to an embodiment of the present invention, the second oil groove is formed on the end surface of the second end of the hub portion of the driving member.
According to an embodiment of the present invention, the second oil groove is spaced apart from an outer periphery of the end surface of the second end of the hub portion of the driving member.
According to an embodiment of the present invention, the scroll compressor further includes: a third thrust bearing disposed between the second end of the hub portion of the driving member and the flange portion of the support
According to an embodiment of the present invention, the motor includes a rotor and a stator fixed to the support, and the rotor of the motor drives the first scroll to rotate through the driving member.
According to an embodiment of the present invention, the rotor of the motor is disposed on a side of the stator facing the first direction or the second direction.
According to an embodiment of the present invention, the driving member includes: a hub portion having an inner hole, the hub portion including a first end and a second end opposite to each other; and a flange portion protruding radially outwards from the first end of the hub portion, the flange portion of the driving member is tightly connected to the outer wall of the first scroll, to form a suction cavity of the scroll compressor, and fluid enters the compression cavity through the suction cavity.
According to an embodiment of the present invention, the driving member includes at least one fluid passage formed in the flange portion of the driving member, the fluid passage has a fluid inlet which is formed in a surface of the flange portion of the driving member facing the first direction and a fluid outlet which is formed in a surface of the flange portion of the driving member facing the second direction, so that fluid enters the fluid passage through the fluid inlet of the fluid passage, and enters the suction cavity from the fluid outlet.
According to an embodiment of the present invention, the fluid passage extends along an axial direction of the driving member.
According to an embodiment of the present invention, the fluid passage extends obliquely relative to an axial direction of the driving member, and the fluid outlet of the fluid passage is farther from a rotation axis of the driving member than the fluid inlet.
According to an embodiment of the present invention, the outer wall has a recess at a position corresponding to a position of the fluid outlet of the fluid passage, the recess is formed on a surface of the outer wall facing a rotation axis of the first scroll, and a wall surface of the recess facing the rotation axis of the first scroll is gradually inclined or curved towards the rotation axis of the first scroll in a direction towards the first end plate of the first scroll.
According to an embodiment of the present invention, the driving member includes two fluid passages opposite to each other in a radial direction of the driving member.
According to an embodiment of the present invention, the fluid passage of the driving member has a circular, oval or curved cross section.
According to an embodiment of the present invention, the driving member includes: a hub portion having an inner hole, the hub portion including a first end and a second end opposite to each other; and a flange portion protruding radially outwards from the first end of the hub portion of the driving member, the driving member being connected to the first scroll through the flange portion, the outer wall of the first scroll has a scroll pin hole, and the flange portion of the driving member has a driving-member pin hole, the outer wall of the first scroll has a scroll connection hole, the flange portion of the driving member has a driving-member connection hole, one of the driving-member connection hole of the flange portion of the driving member and the scroll connection hole of the outer wall of the first scroll has a threaded portion, and the connecting member includes: a pin inserted into the scroll pin hole of the outer wall of the first scroll and the driving-member pin hole of the flange portion of the driving member, to determine a relative position of the first scroll and the driving member, and a bolt, the bolt fixedly connecting the first scroll to the driving member through the scroll connection hole and the driving-member connection hole.
According to an embodiment of the present invention, the scroll compressor further includes: an annular protrusion protruding from one of a surface of the second end plate of the second scroll and a surface of the flange portion of the driving member, the annular protrusion has an annular wedge-shaped protrusion portion, a cross section of the wedge-shaped protrusion portion in a radial direction has a wedge shape, and the wedge-shaped protrusion portion has a wedge-shaped protrusion surface facing axially outwards, in the cross section in the radial direction, the wedge-shaped protrusion surface has a largest axial distance from said one surface at a first wedge-shaped protrusion point in the radial direction, and an axial distance of zero from said one surface at a second wedge-shaped protrusion point in the radial direction, and at least a portion of the wedge-shaped protrusion surface corresponding to the first wedge-shaped protrusion point is in an annular area of the surface of the flange portion of the driving member for supporting the surface of the second end plate of the second scroll.
According to an embodiment of the present invention, at least the portion of the wedge-shaped protrusion surface corresponding to the first wedge-shaped protrusion point is in an annular contact area between the second end plate of the second scroll and the flange portion of the driving member.
According to an embodiment of the present invention, at the first wedge-shaped protrusion point, the axial distance between the wedge-shaped protrusion surface and said one surface is in a range of 0.1 microns to 1 mm.
According to an embodiment of the present invention, at the first wedge-shaped protrusion point, the axial distance between the wedge-shaped protrusion surface and said one surface is in a range of 20 microns to 40 microns.
According to an embodiment of the present invention, the first wedge-shaped protrusion point is on a radially outer side of the second wedge-shaped protrusion point.
According to an embodiment of the present invention, the first wedge-shaped protrusion point is on a radially inner side of the second wedge-shaped protrusion point.
According to an embodiment of the present invention, the annular protrusion is on the surface of the flange portion of the driving member.
According to an embodiment of the present invention, the annular protrusion is on the surface of the second end plate of the second scroll.
According to an embodiment of the present invention, the annular protrusion further has an annular transition protrusion portion, the transition protrusion portion has a transition protrusion surface facing axially outwards, in the cross section in the radial direction, the transition protrusion surface extends from a point of the wedge-shaped protrusion surface corresponding to the first wedge-shaped protrusion point to said one surface in such a manner as to run away from the second wedge-shaped protrusion point and towards said one surface.
According to an embodiment of the present invention, a cross section of the transition protrusion portion in the radial direction has a wedge shape.
According to an embodiment of the present invention, a size of the transition protrusion portion in the radial direction is smaller than a size of the wedge-shaped protrusion portion in the radial direction.
According to an embodiment of the present invention, the scroll compressor further includes: a shell; wherein the first scroll, the second scroll, the support, the motor and the driving member are located in the shell, and an end of the support is fixed to a bottom of the shell.
According to an embodiment of the present invention, the shell includes a first shell, a second shell and a third shell; the first shell is connected to the second shell to form a sealed space; and the second shell is connected to the third shell to define a discharge cavity; and the sealed space accommodates the first scroll, the second scroll, the support, the motor and the driving member, wherein the support is fixed to the first shell.
According to an embodiment of the present invention, the scroll compressor further includes: an oil feeding screw received in the inner hole of the fixed shaft, and having one end located in a sump at a bottom of the shell and the other end connected to the hub portion of the second scroll.
According to an embodiment of the present invention, the driving member further includes an eccentric ring hole formed in the flange portion, the second end plate of the second scroll has a coupling pin hole therein, an eccentric ring is disposed in the eccentric ring hole, and a coupling pin is inserted into the coupling pin hole and a hole of the eccentric ring.
For example, with the scroll compressor according to the embodiment of the present invention, for example, the performance of the scroll compressor can be improved.
BRIEF DESCRIPTION OF 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 second scroll of a scroll compressor according to a modified example of the embodiment of the present invention;
FIG. 5 is a schematic bottom view of the second scroll of the scroll compressor shown in FIG. 4;
FIG. 6 is a schematic cross-sectional view of the second scroll of the scroll compressor shown in FIG. 4 taken along a line FF in FIG. 5;
FIG. 7 is a schematic perspective view of a driving member of the scroll compressor shown in FIG. 1;
FIG. 8 is a schematic perspective view of a driving member of a scroll compressor according to a modified example of the embodiment of the present invention;
FIG. 9 is a schematic perspective view of the driving member of the scroll compressor shown in FIG. 7, showing a fluid passage in a form;
FIG. 10 is a schematic top view of the driving member of the scroll compressor shown in FIG. 7;
FIG. 11 is a schematic perspective view of the driving member of the scroll compressor shown in FIG. 1, showing a fluid passage in another form;
FIG. 12 is a schematic perspective view of the driving member, the first scroll, the second scroll, a fixed shaft, etc., in an assembled state, of the scroll compressor shown in FIG. 1;
FIG. 13 is a schematic exploded perspective view of the driving member, the first scroll, the second scroll, the fixed shaft, etc. of the scroll compressor shown in FIG. 12;
FIG. 14 is a schematic sectional view of the driving member, the first scroll, the second scroll, the fixed shaft, etc. of the scroll compressor shown in FIG. 12;
FIG. 15 is a schematic exploded perspective view of the driving member, the first scroll, the second scroll, the fixed shaft, etc. of the scroll compressor shown in FIG. 12;
FIG. 16 is a schematic cross-sectional view of the driving member, the second scroll, the fixed shaft, and an oil feeding screw, etc., in an assembled state, of the scroll compressor shown in FIG. 1;
FIG. 17 is a schematic perspective view of a support of the scroll compressor shown in FIG. 1;
FIG. 18 is a schematic cross-sectional view of the support of the scroll compressor shown in FIG. 17;
FIG. 19 is a schematic cross-sectional view of a driving member and a support, in an assembled state, of a scroll compressor according to a modified example of the embodiment of the present invention;
FIG. 20 is a schematic perspective view of the support of the scroll compressor shown in FIG. 19;
FIG. 21 is a schematic exploded perspective view of the driving member, the first scroll, and the second scroll of the scroll compressor shown in FIG. 1;
FIG. 22 is a schematic cross-sectional view of the driving member, the first scroll, and the second scroll, in an assembled state, of the scroll compressor shown in FIG. 21;
FIG. 23 is a schematic exploded perspective view of the driving member, the first scroll, and the second scroll of the scroll compressor shown in FIG. 21;
FIG. 24 is a schematic cross-sectional view of a support, a fixed shaft, a driving member, and a second scroll, in an assembled state, of a scroll compressor according to a modified example of the embodiment of the present invention;
FIG. 25 is a schematic cross-sectional perspective view of the support, the fixed shaft, the driving member, and the second scroll, in an assembled state, of the scroll compressor shown in FIG. 24;
FIG. 26 is a schematic perspective view of a fixed shaft for an interference fit connection according to a modified example of the embodiment of the present invention;
FIG. 27 is a schematic cross-sectional view of the fixed shaft shown in FIG. 26;
FIG. 28 is a schematic cross-sectional perspective view of the fixed shaft shown in FIG. 26;
FIG. 29 is a schematic perspective view of a fixed shaft for a threaded connection according to a modified example of the embodiment of the present invention;
FIG. 30 is a schematic cross-sectional view of the fixed shaft shown in FIG. 29;
FIG. 31 is a schematic cross-sectional perspective view of the fixed shaft shown in FIG. 29;
FIG. 32 is a schematic perspective view of a support for an interference fit connection according to a modified example of the embodiment of the present invention;
FIG. 33 is a schematic cross-sectional view of the support shown in FIG. 32;
FIG. 34 is a schematic cross-sectional perspective view of the support shown in FIG. 32;
FIG. 35 is a schematic perspective view of a support for a threaded connection according to a modified example of the embodiment of the present invention;
FIG. 36 is a schematic cross-sectional view of the support shown in FIG. 35;
FIG. 37 is a schematic cross-sectional perspective view of the support shown in FIG. 35;
FIG. 38 is a schematic cross-sectional view of a driving member and a second scroll of a scroll compressor according to a modified example of the embodiment of the present invention;
FIG. 39 is a schematic partial enlarged cross-sectional view of a part relevant to an annular protrusion in FIG. 38;
FIG. 40 is a schematic cross-sectional view of a driving member and a second scroll of a scroll compressor according to another modified example of the embodiment of the present invention;
FIG. 41 is a schematic partial enlarged cross-sectional view of a part relevant to an annular protrusion in FIG. 40;
FIG. 42 is a schematic cross-sectional view of a driving member and a second scroll of a scroll compressor according to yet another modified example of the embodiment of the present invention;
FIG. 43 is a schematic partial enlarged cross-sectional view of a part relevant to an annular protrusion in FIG. 42;
FIG. 44 is a schematic cross-sectional view of a driving member and a second scroll of a scroll compressor according to still another modified example of the embodiment of the present invention;
FIG. 45 is a schematic partial enlarged cross-sectional view of a part relevant to a annular protrusion in FIG. 44;
FIG. 46 is a schematic cross-sectional perspective view of a support, a fixed shaft, and a driving member of a scroll compressor according to a modified example of the embodiment of the present invention;
FIG. 47 is a schematic cross-sectional view of a support, a fixed shaft, and a driving member of a scroll compressor according to a modified example of the embodiment of the present invention;
FIG. 48 is a schematic exploded perspective view of a driving member, a thrust bearing and a second scroll of a scroll compressor according to a modified example of the embodiment of the present invention;
FIG. 49 is a schematic perspective view of the driving member, the thrust bearing and the second scroll, in an assembled state, of the scroll compressor shown in FIG. 48;
FIG. 50 is a schematic cross-sectional perspective view of the driving member, the thrust bearing and the second scroll of the scroll compressor shown in FIG. 49;
FIG. 51 is a schematic cross-sectional view of the driving member, the thrust bearing and the second scroll of the scroll compressor shown in FIG. 49;
FIG. 52 is a schematic exploded perspective view of a driving member, a thrust bearing and a second scroll of a scroll compressor according to another modified example of the embodiment of the present invention;
FIG. 53 is a schematic perspective view of the driving member, the thrust bearing and the second scroll, in an assembled state, of the scroll compressor shown in FIG. 52;
FIG. 54 is a schematic cross-sectional perspective view of the driving member, the thrust bearing, and the second scroll of the scroll compressor shown in FIG. 53; and
FIG. 55 is a schematic cross-sectional view of the driving member, the thrust bearing and the second scroll of the scroll compressor shown in FIG. 53.
DETAILED DESCRIPTION
Embodiments of the present invention will be described below in conjunction with the accompanying drawings.
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 support 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 protruding from the first end plate 112 along a 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 along a second direction D2 opposite to the first direction D1. The second scroll wrap 124 and the first scroll wraps 113 cooperate to form a compression cavity for compressing a medium. The support 4 is located on a side of the second scroll 12 away from the first scroll 11. The driving member 3 is rotatably mounted to the support 4 and is located on the side of the second scroll 12 away from the first scroll 11. The motor 7 drives the first scroll 11 to rotate around a rotation axis 91 (FIGS. 15, 27, and 30) through the driving member 3, and the first scroll 11 drives the second scroll 12 to rotate around a rotation axis 92 (FIGS. 15, 27, and 30). The rotation axis 91 is a rotation axis of the driving member 3 (FIGS. 7, 9, and 11). The rotation axis 91 and the rotation axis 92 are parallel to each other and spaced apart from each other. The second scroll 12 and the driving member 3 may have the same rotational speed and rotational direction, but have different rotational axes.
According to an embodiment of the present invention, all bearings of the scroll compressor 100 may be disposed on a side of the second end plate 123 of the second scroll 12 facing the first direction D1. Any bearing may not be disposed on a side of the first end plate 112 of the first scroll 11 of the scroll compressor 100 facing the second direction D2.
Referring to FIG. 1, in an embodiment of the present invention, the scroll compressor 100 further includes a shell 101, and the shell 101 may include a first shell 1011, a second shell 1012 and a third shell 1013. The first shell 1011 and the second shell 1012 form a sealed space, and the first scroll 11, the second scroll 12, the support 4, the motor 7 and the driving member 3 and the like are disposed in the shell 101. The second shell 1012 and the third shell 1013 define a discharge cavity. The support 4 may be fixed to the first shell 1011. For example, the support 4 is welded to the first shell 1011, the support 4 is fixed to the first shell 1011 through interference fitting with the first shell 1011, or the support 4 is fixed to the first shell 1011 by bolts. An end of the support 4 may be fixed to a bottom of the shell 101 or the bottom of the first shell 1011.
Referring to FIG. 1, in an embodiment of the present invention, the scroll compressor 100 further includes a connecting member 130 (FIG. 22), and the connecting member 130 may connect the first scroll 11 to the driving member 3. The connecting member 130 may be integrated with one of the first scroll 11 and the driving member 3, or may also be a separate connecting member.
Referring to FIG. 1 and FIG. 2, in an embodiment of the present invention, the first scroll 11 further includes an outer wall 111 protruding from the first end plate 112 along the first direction D1. The outer wall 111 is on a radially outer side of the first scroll wrap 113 and the second scroll 12. The outer wall 111 may be provided with the connecting member 130 (FIG. 22), and the driving member 3 is connected to the first scroll 11 through the connecting member 130 (FIG. 22). The outer wall 111 may have an annular shape.
Referring to FIGS. 1, 7-16, and 24-37, in an embodiment of the present invention, the driving member 3 includes: a hub portion 31 having an inner hole 30 The hub portion 31 includes a first end 311 and a second end 312 opposite to each other; and a flange portion 32 protruding radially outwards from the first end 311 of the hub portion 31 of the driving member 3. The driving member 3 is connected to the first scroll 11 through the flange portion 32. Referring to FIGS. 1, 12-16, and 24-37, in an embodiment of the present invention, the scroll compressor 100 further includes: a fixed shaft 5 fixed to the support 4. The driving member 3 is rotatably mounted to the fixed shaft 5 through the hub portion 31 so that the driving member 3 is rotatably mounted to the support 4. Referring to FIGS. 1, 13-16, 21-25, and 38-41, in an embodiment of the present invention, the second end plate 123 of the second scroll 12 is rotatably supported by the flange portion 32 of the driving member 3. According to an example of the present invention, referring to FIGS. 2, 7, and 21-23, the outer wall 111 of the first scroll 11 has a scroll pin hole 114 (FIG. 2), and the flange portion 32 of the driving member 3 has a driving-member pin hole 322 (FIG. 7). The outer wall 111 of the first scroll 11 has a scroll connection hole 116 (FIGS. 22 and 23), the flange portion 32 of the driving member 3 has a driving-member connection hole 323, and one of the driving-member connection hole 323 of the flange portion 32 of the driving member 3 and the scroll connection hole 116 of the outer wall 111 of the first scroll 11 has a threaded portion 324. The connecting member 130 (FIG. 22) may include: a pin 131 and a bolt 132. 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 driving-member pin hole 322 (FIG. 7) of the flange portion 32 of the driving member 3, to determine a relative position of the first scroll 11 and the driving member 3. The connecting member 130 (FIG. 22) may further include a bolt 132, which may fixedly connect the first scroll 11 to the driving member 3 through the scroll connection hole 116 (FIGS. 22 and 23) and the driving-member connection hole 323. In an embodiment, as shown in FIG. 23, the threaded portion 324 may be disposed in the driving-member connection hole 323. The scroll connection hole 116 may be a through hole. The bolt 132 is inserted into the driving-member connection hole 323 from an end of the scroll connection hole 116 and fits in the threaded portion 324, to fixedly connect the first scroll 11 to the driving member 3.
Referring to FIGS. 1, 14, and 16, in an embodiment of the present invention, the scroll compressor 100 further includes: a first bearing 51 and a second bearing 52. The first bearing 51 is located in a space between a radially inner surface of the first end 311 of the hub portion 31 and a radially outer surface of the fixed shaft 5. The first end 311 of the hub portion 31 may be mounted to the fixed shaft 5 through the first bearing 51, and the second end 312 of the hub portion 31 is mounted to the fixed shaft 5 through the second bearing 52. Referring to FIGS. 1, 3, 4, 6, and 16, in an embodiment of the present invention, the second scroll 12 further includes a hub portion 121 protruding from the second end plate 123 along the first direction D1. Referring to FIGS. 1, 14, and 16, the fixed shaft 5 has an axial inner hole 50. The scroll compressor 100 further includes a third bearing 53, which may be located in a space between a radially outer side of the hub portion 121 of the second scroll 12 and a radially inner side of the axial inner hole 50 of the fixed shaft 5. The hub portion 121 of the second scroll 12 is mounted in the axial inner hole 50 of the fixed shaft 5 through the third bearing 53. The first bearing 51 is mounted in a central hole of the first end 311 of the hub portion 31. The first bearing 51 may also be a bearing including a lining and a bushing, with the lining mounted in the central hole of the first end 311 of the hub portion 31, and the bushing assembled with an outer surface of the fixed shaft 5. The second bearing 52 is mounted in an inner hole of the second end 312 of the hub portion 31. The third bearing 53 may also be a bearing including a lining and a bushing.
Referring to FIGS. 1, 7, 9, 11, 16, 24, 25, and 42, in an embodiment of the present invention, a hole wall 301 of the inner hole 30 of the hub portion 31 of the driving member 3 has a stepped portion 302. The stepped portion 302 of the hub portion 31 of the driving member 3 has a stepped surface 303 facing the second direction D2. The fixed shaft 5 has a stepped portion 501, and the stepped portion 501 of the fixed shaft 5 has a stepped surface 502 facing the first direction D1. The scroll compressor 100 further includes a first thrust bearing 54. The first thrust bearing 54 is disposed between the stepped surface 303 of the stepped portion 302 of the hub portion 31 of the driving member 3 and the stepped surface 502 of the stepped portion 501 of the fixed shaft 5. The first thrust bearing 54 may be any suitable known 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. The first thrust bearing 54 may also be a thrust surface.
Referring to FIGS. 1, 17, 18, 20, and 24-37, in an embodiment of the present invention, the support 4 includes: a cylindrical portion 41, and a flange portion 42 radially protruding from the cylindrical portion 41 of the support 4. The second end 312 of the hub portion 31 of the driving member 3 is supported by the flange portion 42 of the support 4. According to an example of the present invention, a part of the fixed shaft 5 is inserted into the cylindrical portion 41 of the support 4 and fixed to the cylindrical portion 41 of the support 4, and the fixed shaft 5 has a cylindrical shape.
Referring to FIGS. 24-37, in an example of the embodiment of the present invention, the fixed shaft 5 has a fitting shaft portion 59, the cylindrical portion 41 of the support 4 has a fitting hole portion 49, and the fitting shaft portion 59 of the fixed shaft 5 is fixedly connected to the fitting hole portion 49 of the cylindrical portion 41 of the support 4, to fix the fixed shaft 5 to the support 4. Referring to FIGS. 26-28, and 32-34, according to an example of the present invention, the fitting shaft portion 59 of the fixed shaft 5 is fixedly connected to the fitting hole portion 49 of the cylindrical portion 41 of the support 4 through interference fitting. Referring to FIGS. 29-31, and 35-37, according to another example of the present invention, the fitting shaft portion 59 of the fixed shaft 5 is fixedly connected to the fitting hole portion 49 of the cylindrical portion 41 of the support 4 through threaded connection, that is, the fitting shaft portion 59 of the fixed shaft 5 and the fitting hole portion 49 of the cylindrical portion 41 of the support 4 have threads. Referring to FIGS. 1, and 4-6, in an embodiment of the present invention, a surface 1230 of the second end plate 123 of the second scroll 12 has a first oil groove 55 on an annular contact area between the second end plate 123 of the second scroll 12 and the flange portion 32 of the driving member 3. The first oil groove 55 extends transversely across a part of the annular contact area from a radially inner side of the annular contact area towards a radially outer side of the annular contact area. The first oil groove 55 is spaced radially from a radially outer edge of the annular contact area. The first oil groove 55 may extend along a radial direction. An annular recess 122 is formed on the surface 1230 of the second end plate 123 of the second scroll 12. The annular recess 122 is on the radially inner side of the annular contact area, and the first oil groove 55 extends transversely from a radially outer edge 1220 of the annular recess 122 towards the radially outer side of the annular contact area and communicates with the annular recess 122.
Referring to FIGS. 48-55, in an alternative embodiment of the present invention, the scroll compressor 100 further includes: a second thrust bearing 55′ disposed between the second end plate 123 of the second scroll 12 and the flange portion 32 of the driving member 3. Specifically, a surface 320 of the flange portion 32 of the driving member 3 has an annular groove 3201. In the embodiment shown in FIGS. 48-51, the groove 3201 is relatively deep, while in the embodiment shown in FIGS. 52-55, the groove 3201 is relatively shallow. 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 provided on an inner side of an eccentric ring hole 326, formed in the flange portion 32, in the radial direction.
Referring to FIGS. 1, 8, 19, and 20, in an embodiment of the present invention, one of an end surface 3120 of the second end 312 of the hub portion 31 of the driving member 3 and a surface 420 of the flange portion 42 of the support 4 has a second oil groove 56 on an annular contact area between the second end 312 of the hub portion 31 of the driving member 3 and the flange portion 42 of the support 4. The second oil groove 56 extends transversely across a part of the annular contact area from a radially inner side of the annular contact area towards a radially outer side of the annular contact area. The second oil groove 56 is spaced radially from a radially outer edge of the annular contact area. The second oil groove 56 may extend along a radial direction. According to an example of the present invention, as shown in FIG. 8, the second oil groove 56 may be formed on the end surface 3120 of the second end 312 of the hub portion 31 of the driving member 3. The second oil groove 56 is spaced apart from an outer periphery 3121 of the end surface 3120 of the second end 312 of the hub portion 31 of the driving member 3. As shown in FIG. 20, the second oil groove 56 may also be formed on the surface 420 of the flange portion 42 of the support 4. The second oil groove 56 may be at least one oil groove, or two or more oil grooves distributed at a certain interval (such as an equal interval).
Referring to FIG. 47, in an alternative embodiment of the present invention, the scroll compressor 100 further includes: a third thrust bearing 57 disposed between the second end 312 of the hub portion 31 of the driving member 3 and the flange portion 42 of the support 4. The third thrust bearing 57 may be any suitable known thrust bearing. For example, the third thrust bearing 57 may be an annular thrust washer made of a wear-resistant metallic or non-metallic material, or the third thrust bearing 57 may be a ball thrust bearing (as shown in FIG. 47), a roller thrust bearing, etc.
Referring to FIG. 1, in an embodiment of the present invention, the motor 7 may be an axial flux motor or a radial flux motor. In an embodiment, the motor 7 includes a rotor 71 and a stator 72 fixed to the support 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 FIGS. 1, 2, 7-16, and 21-23, in an embodiment of the present invention, the flange portion 32 of the driving member 3 is tightly connected to the outer wall 111 of the first scroll 11, to form a suction cavity 88 of the scroll compressor 100, and fluid enters the compression cavity through the suction cavity 88. Referring to FIGS. 7 and 9-11, the driving member 3 includes at least one fluid passage 6 formed in the flange portion 32 of the driving member 3, and the fluid passage 6 has a fluid inlet 61 which is formed in a surface 321 of the flange portion 32 of the driving member 3 facing the first direction D1 and a fluid outlet 62 which is formed in the surface 320 of the flange portion 32 of the driving member 3 facing the second direction D2, so that fluid enters the fluid passage 6 through the fluid inlet 61 of the fluid passage 6, and enters the suction cavity 88 from the fluid outlet 62. The driving member 3 may include two fluid passages 6 opposite to each other in the radial direction of the driving member 3. The fluid passage 6 of the driving member 3 may have a circular, oval or curved cross section. According to an example of the present invention, as shown in FIGS. 7, 9, and 10, the fluid passage 6 extends obliquely relative to the axial direction of the driving member 3, and the fluid outlet 62 of the fluid passage 6 is farther away from the rotation axis 91 of the driving member 3 than the fluid inlet 61. For example, assuming that a first plane passes through a point, at the fluid inlet 61, of an axis 93 of the fluid passage 6 and the rotation axis 91 of the driving member 3, while a second plane is perpendicular to the first plane and parallel to the rotation axis 91 of the driving member 3, then an included angle between the axis 93 of the fluid passage 6 and the first plane is 0 to 60 degrees, and an included angle between the axis 93 of the fluid passage 6 and the second plane is 5 to 60 degrees. According to another example of the present invention, as shown in FIG. 11, the fluid passage 6 extends along the axial direction of the driving member 3, that is, the axis 93 of the fluid passage 6 is parallel to the rotation axis 91 of the driving member 3, the included angle between the axis 93 of the fluid passage 6 and the first plane is 0 degrees, and the included angle between the axis 93 of the fluid passage 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 a 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 towards the rotation axis of the first scroll 11 in a direction towards 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: an oil feeding screw 81. The oil feeding screw 81 is received in the inner hole 50 of the fixed shaft 5, and has an end located in a sump at the bottom of the shell 101 and the other end connected to the hub portion 121 of the second scroll 12. The scroll compressor 100 may also include any other suitable pump.
Referring to FIGS. 7, 9, 10, 11, 13, 15, 23, 24, and 25, 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 FIGS. 13, 15, 23, 24, and 25) is disposed 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 of the eccentric ring 341. The driving member 3 may have three eccentric ring holes 326.
Referring to FIGS. 38-45, in an embodiment of the present invention, the scroll compressor 100 further includes an annular protrusion 73 protruding from one of the surface 1230 of the second end plate 123 of the second scroll 12 and the surface 320 of the flange portion 32 of the driving member 3. The annular protrusion 73 has an annular wedge-shaped protrusion portion 731. A cross section of the wedge-shaped protrusion portion 731 in the radial direction has a wedge shape, and the wedge-shaped protrusion portion 731 has a wedge-shaped protrusion surface 7310 facing axially outwards. The wear of the thrust surface can be improved by the annular protrusion disposed on the surface 1230 of the second end plate 123 or the surface 320 of the flange portion 32. In the cross section in the radial direction, the wedge-shaped protrusion surface 7310 has a largest axial distance from the surface 320 (the embodiment shown in FIGS. 38-41) or the surface 1230 (the embodiment shown in FIGS. 42-45) at a first wedge-shaped protrusion point P1 in the radial direction, and an axial distance of zero from the surface 320 (the embodiment shown in FIGS. 38-41) or the surface 1230 (the embodiment shown in FIGS. 42-45) at a second wedge-shaped protrusion point P2 in the radial direction. At least a portion of the wedge-shaped protrusion surface 7310 corresponding to the first wedge-shaped protrusion point P1 is in an annular area of the surface 320 of the flange portion 32 of the driving member 3 for supporting the surface 1230 of the second end plate 123 of the second scroll 12. For example, at least the portion of the wedge-shaped protrusion surface 7310 corresponding to the first wedge-shaped protrusion point P1 is in the annular contact area between the second end plate 123 of the second scroll 12 and the flange portion 32 of the driving member 3. For example, most or all of the portion of the wedge-shaped protrusion surface 7310 corresponding to the first wedge-shaped protrusion point P1 and the rest of the wedge-shaped protrusion surface 7310 are located in the annular area of the surface 320 of the flange portion 32 of the driving member 3 for supporting the surface 1230 of the second end plate 123 of the second scroll 12.
For example, most or all of the portion of the wedge-shaped protrusion surface 7310 corresponding to the first wedge-shaped protrusion point P1 and the rest of the wedge-shaped protrusion surface 7310 are located in the annular contact area between the second end plate 123 of the second scroll 12 and the flange portion 32 of the driving member 3. According to an example of the present invention, at the first wedge-shaped protrusion point P1, the axial distance between the wedge-shaped protrusion surface 7310 and the surface 320 (the embodiment shown in FIGS. 38-41) or the surface 1230 (the embodiment shown in FIGS. 42-45) is in a range of 0.1 microns to 1 mm. According to a further example of the present invention, at the first wedge-shaped protrusion point P1, the axial distance between the wedge-shaped protrusion surface 7310 and the surface 320 (the embodiment shown in FIGS. 38-41) or the surface 1230 (the embodiment shown in FIGS. 42-45) is in a range of 20 microns to 40 microns. The first wedge-shaped protrusion point P1 may be on a radially outer side of the second wedge-shaped protrusion point P2, or the first wedge-shaped protrusion point P1 may be on a radially inner side of the second wedge-shaped protrusion point P2. The annular protrusion 73 may be on the surface 320 of the flange portion 32 of the driving member 3 (the embodiment shown in FIGS. 38-41), or the annular protrusion 73 may be on the surface 1230 of the second end plate 123 of the second scroll 12 (the embodiment shown in FIGS. 42-45).
Referring to FIGS. 38-45, in an embodiment of the present invention, the annular protrusion 73 further has an annular transition protrusion portion 732, and the transition protrusion portion 732 has a transition protrusion surface 7320 facing axially outwards. In the cross section in the radial direction, the transition protrusion surface 7320 extends from a point of the wedge-shaped protrusion surface 7310 corresponding to the first wedge-shaped protrusion point P1 to the surface 320 (the embodiment shown in FIGS. 38-41) or the surface 1230 (the embodiment shown in FIGS. 42-45) in such a manner as to run away from the second wedge-shaped protrusion point P2 and towards the surface 320 (the embodiment shown in FIGS. 38-41) or the surface 1230 (the embodiment shown in FIGS. 42-45). The cross section of the transition protrusion portion 732 in the radial direction may have a wedge shape. A size of the transition protrusion portion 732 in the radial direction may be smaller than a size of the wedge-shaped protrusion portion 731 in the radial direction.
When the compressor 100 is in operation, referring to FIG. 1, the motor 7 drives the first scroll 11 to rotate through the driving member 3, and the first scroll 11 drives the second scroll 12 to rotate. Refrigerant enters the sealed space formed by the first shell 1011 and the second shell 1012 of the shell 101 through an inlet 82. Apart of the refrigerant flows upwards, bypasses an upper end of a cylindrical baffle 83, and then flows downwards, and enters the fluid passage 6 through the fluid inlet 61 of the fluid passage 6 (see FIGS. 7 and 9-11). Another part of the refrigerant flows downward, enters the motor 7 below a lower end of the cylindrical baffle 83 to cool the motor, and then flows upward, and enters the fluid passage 6 through the fluid inlet 61 of the fluid passage 6 (see FIGS. 7 and 9-11). All the refrigerant enters, via the suction cavity 88, the compression cavity formed by the second scroll wrap 124 and the first scroll wrap 113. The compressed refrigerant is discharged through an outlet 84. Referring to FIGS. 7, 9, and 10, if the fluid passage 6 extends obliquely relative 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 a primary-stage compression due to a centrifugal force. Then, the refrigerant enters, through the suction cavity 88, the compression cavity formed by the second scroll wrap 124 and the first scroll wrap 113 to undergo a secondary-stage compression. The compression power of the compressor can be increased through the two-stage compression. At the same time, the second scroll 12 drives the oil feeding screw 81 disposed in the axial inner hole 50 of the fixed shaft 5 to rotate, and lubricating oil contained in the sump at the bottom of the first shell 1011 of the shell 101 is drawn into the axial inner hole 50 of the fixed shaft 5. A first part of the lubricating oil flows through a transverse through hole 85 (such as a radial through hole) in the fixed shaft 5 to the second bearing 52 and a place between and the second end 312 of the hub portion 31 of the driving member 3 and the flange portion 42 of the support 4 (see FIG. 1). A second part of the lubricating oil enters a gap between the hub portion 121 of the second scroll 12 and the third bearing 53 to lubricate the third bearing 53, and a part of the lubricating oil entering the gap between the hub portion 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 portion 32 of the driving member 3, and finally enters a 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 entering the gap between the hub portion 121 of the second scroll 12 and the third bearing 53 bypasses an upper end of the third bearing 53 and enters the first bearing 51, and partly enters an oil return passage 862 formed in the fixed shaft 5, then enters an oil return passage 861 formed in the fixed shaft 5 through a communication hole 89 and finally returns to the sump at the bottom of the first shell 1011 of the shell 101. The lubricating oil entering the first bearing 51 enters the oil return passage 862 through a transverse through hole 87 (such as a radial through hole), then enters the oil return passage 861 through the communication hole 89, and finally returns to the sump at the bottom of the first shell 1011 of the shell 101.
With the scroll compressor according to the embodiment of the present invention, since the first scroll and the second scroll corotate around respective rotation axes, the compression efficiency is improved. In addition, an axial flux motor may be used, which can decrease the size of the motor, thereby making the structure of 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 second scroll can be driven to rotate by the first scroll, so that all bearings may be further arranged on the same side of the compressor, such as the same side of the second scroll in the first direction D1, so that the structure of the compressor can be further made compact.
Although the above embodiments have been described, some features of the above embodiments may be combined to form new embodiments.
Patent Application
20250067262
