Outer rotor wind wheel, outer rotor fan and air conditioner

Abstract

The utility model discloses an outer rotor wind wheel, an outer rotor fan and an air conditioner. The outer rotor wind wheel comprises a wind wheel and an outer rotor. The wind wheel comprises a hub and a plurality of blades arranged on the peripheral wall of the hub, a concave cavity is formed in one axial side of the hub, the wind wheel is a plastic part, the outer rotor is arranged in the concave cavity and fixed to the hub, the outer rotor comprises a rotor iron core and magnetic steel arranged on the rotor iron core, and the rotor iron core, the magnetic steel and the wind wheel are integrated through injection molding. According to the outer rotor wind wheel, the concave cavity is formed in the axial side of the hub, so that the outer rotor can be contained in the concave cavity of the hub, the internal space of the hub can be effectively utilized, the overall space occupied by an outer rotor fan is reduced, and the outer rotor fan is compact in structure and small in size; moreover, the rotor iron core, the magnetic steel and the wind wheel are integrated through injection molding, so that the assembly process between the wind wheel and the rotor iron core and the assembly process between the wind wheel and the magnetic steel are omitted, and the production efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the field of fans, and in particular to an external rotor wind wheel, an external rotor fan and an air conditioner. Background Art

[0002] A fan is an important component of equipment such as an air conditioner. The fan includes a motor and a wind wheel connected to each other. The motor drives the wind wheel to rotate, thereby driving the air to flow, so as to achieve the effect of blowing or sucking the air flow. In the related art, the space occupied by the motor and the wind wheel of the fan is relatively large. Therefore, there is room for improvement. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, an object of the utility model is to provide an external rotor wind wheel, which includes a wind wheel and an external rotor. The external rotor includes a rotor core and a magnet disposed on the rotor core. By forming a concave cavity on one axial side of the hub, the external rotor can be accommodated in the concave cavity of the hub. Integrating the external rotor into the hub of the wind wheel can effectively utilize the internal space of the hub, reduce the overall space occupied by the motor and the wind wheel of the external rotor fan, and make the structure of the external rotor fan compact and small in volume. Moreover, by integrally injecting the rotor core, the magnet and the wind wheel, the reliability of the entire hub structure can be enhanced, the assembly process between the wind wheel, the rotor core and the magnet can be omitted, the production efficiency can be improved, and at the same time, the overall structure of the external rotor wind wheel is more stable and reliable.

[0004] The utility model also provides an external rotor fan having the above external rotor wind wheel.

[0005] The utility model also provides an air conditioner having the above external rotor fan.

[0006] The external rotor wind wheel according to the first aspect embodiment of the utility model includes: a wind wheel, which includes a hub and a plurality of blades disposed on the outer peripheral wall of the hub. A concave cavity is formed on one axial side of the hub, and the wind wheel is a plastic part; an external rotor, which is disposed in the concave cavity and fixed to the hub. The external rotor includes a rotor core and a magnet disposed on the rotor core, and the rotor core, the magnet and the wind wheel are integrally injection molded.

[0007] An external rotor wind wheel according to an embodiment of the present invention includes a wind wheel and an external rotor. The external rotor includes a rotor core and magnetic steel disposed on the rotor core. By forming a concave cavity on one axial side of the hub, the external rotor can be accommodated in the concave cavity of the hub. Integrating the external rotor into the hub of the wind wheel can effectively utilize the internal space of the hub, reduce the overall space occupied by the motor and the wind wheel of the external rotor fan, and make the structure of the external rotor fan compact and small in size. Moreover, by integrally injecting the rotor core, magnetic steel and wind wheel, the reliability of the entire hub structure can be enhanced, the assembly process between the wind wheel and the rotor core and the magnetic steel can be omitted, the production efficiency can be improved, and at the same time, the overall structure of the external rotor wind wheel is more stable and reliable.

[0008] According to some embodiments of the present invention, at least a part of the external rotor is embedded in the peripheral wall of the concave cavity.

[0009] According to some embodiments of the present invention, the rotor core is embedded in the peripheral wall of the concave cavity.

[0010] According to some embodiments of the present invention, the rotor core is in a circular ring shape, the magnetic steel includes a plurality of magnetic steel sheets, the plurality of magnetic steel sheets are disposed on the inner peripheral surface of the rotor core, an embedding cavity is formed in the peripheral wall of the concave cavity, the embedding cavity is in a circular ring shape extending along the circumferential direction of the hub, the rotor core is accommodated in the embedding cavity, an opening communicating with the embedding cavity is formed on the inner peripheral surface of the concave cavity, the number of the openings is the same as and corresponds to the number of the magnetic steel sheets one by one, and each magnetic steel sheet is accommodated in the corresponding opening.

[0011] According to some embodiments of the present invention, the concave cavity has a first wall surface and a second wall surface opposite to each other in the radial direction, the second wall surface surrounds the outer peripheral side of the first wall surface, the inner peripheral surface of the rotor core is attached to the first wall surface, the outer peripheral surface of the rotor core is attached to the second wall surface, and the opening penetrates the first wall surface along the radial direction of the rotor core.

[0012] According to some embodiments of the present invention, the concave cavity further has a third wall surface and a fourth wall surface opposite to each other in the axial direction, one of the two axial end surfaces of the rotor core is attached to the third wall surface, and the other of the two axial end surfaces of the rotor core is attached to the fourth wall surface.

[0013] According to some embodiments of the present invention, the opening has a fifth wall surface and a sixth wall surface opposite to each other in the axial direction of the hub, the two surfaces of the magnetic steel sheet in the axial direction of the hub are a first surface and a second surface respectively, the first surface is attached to the fifth wall surface, and the second surface is attached to the sixth wall surface.

[0014] According to some embodiments of the present utility model, a connecting rib is defined between two adjacent openings, and the connecting rib constitutes the side wall of the opening in the circumferential direction of the hub.

[0015] According to some embodiments of the present utility model, the hub includes an outer hub portion, an inner hub portion, and a hub connecting portion. The outer hub portion is cylindrical and sleeved on the outer peripheral side of the inner hub portion. One axial end of the outer hub portion is connected to one axial end of the inner hub portion through the hub connecting portion, and the concave cavity is defined inside the inner hub portion.

[0016] According to some embodiments of the present utility model, the hub further includes radially extending radial reinforcing ribs. The radially inner ends of the radial reinforcing ribs are connected to the other axial end of the inner hub portion, and the radially outer ends of the radial reinforcing ribs are connected to the inner peripheral wall of the outer hub portion. There are multiple radial reinforcing ribs, and the multiple radial reinforcing ribs are arranged at intervals in the circumferential direction of the inner hub portion.

[0017] According to some embodiments of the present utility model, in the direction from the inner hub portion to the outer hub portion, the axial height of the radial reinforcing rib gradually increases.

[0018] According to some embodiments of the present utility model, the rotor core is circular ring-shaped, an anti-rotation groove is formed on the rotor core, and a protrusion is formed on the hub, and the protrusion is embedded in the anti-rotation groove.

[0019] According to some embodiments of the present utility model, the anti-rotation groove is a notch formed at one axial end of the rotor core; and / or, there are multiple anti-rotation grooves, and the multiple anti-rotation grooves are arranged at intervals in the circumferential direction of the rotor core.

[0020] According to some embodiments of the present utility model, the outer diameter of the rotor core is 50 mm to 200 mm.

[0021] According to some embodiments of the present utility model, the rotor core is circular ring-shaped, the magnetic steel includes multiple magnetic steel sheets, the multiple magnetic steel sheets are arranged on the inner peripheral surface of the rotor core, the radial thickness of the rotor core is 1 mm to 40 mm, or the radial thickness of the magnetic steel sheet is 2 mm to 40 mm, or the magnetic steel sheet is arc-shaped and the inner surface radian and the outer surface radian of the magnetic steel sheet are the same.

[0022] The outer-rotor fan according to the embodiments of the second aspect of the present utility model includes: an outer-rotor wind wheel according to the embodiments of the first aspect of the present utility model; a stator assembly, the outer rotor is sleeved on the outer peripheral side of the stator assembly, and at least part of the stator assembly is located in the concave cavity; a rotating shaft, the stator assembly is sleeved on the outer peripheral side of the rotating shaft, and the rotating shaft is connected to the hub.

[0023] According to the external rotor fan of the embodiment of the present utility model, by including the external rotor impeller according to the embodiment of the first aspect of the present utility model, a concave cavity is formed on one axial side of the hub of the external rotor impeller, so that the stator assembly can be accommodated in the concave cavity, making the overall structure of the external rotor fan compact and small in size; and, by integrally injecting the rotor core, the magnetic steel and the impeller, the reliability of the entire hub structure can be enhanced, the production efficiency can be improved, and at the same time, the structure of the external rotor impeller is made more stable and reliable.

[0024] According to some embodiments of the present utility model, a through hole for passing through the rotating shaft is formed on the bottom wall of the concave cavity, and the rotating shaft is connected to the bottom wall of the concave cavity.

[0025] According to some embodiments of the present utility model, a bushing is installed in the through hole, the bushing is a metal part, the bushing is fixed relative to the hub, the bushing has a shaft hole for cooperating with the rotating shaft, and the bushing is fixed relative to the rotating shaft.

[0026] According to some embodiments of the present utility model, the shaft hole is D-shaped or circular; and / or, the bushing is integrally injection molded with the hub.

[0027] According to some embodiments of the present utility model, the external rotor fan further includes a rolling bearing, the rolling bearing is sleeved on the outer peripheral side of the rotating shaft and is located between the rotating shaft and the stator, and one axial end of the bushing abuts against the inner ring of the rolling bearing axially; the external rotor fan further includes a locking nut, the locking nut is threadedly connected to the rotating shaft and is located on the side of the bushing away from the rolling bearing, and the locking nut is located outside the concave cavity and abuts against both the bushing and the bottom wall of the concave cavity axially.

[0028] According to some embodiments of the present utility model, the stator assembly includes a stator and a plastic sealing member, the stator and the plastic sealing member are integrally injection molded, the plastic sealing member includes an outer end plastic sealing portion, the outer end plastic sealing portion is located on the side of the stator facing the open mouth of the concave cavity, and the outer end plastic sealing portion covers at least part of the open mouth or the outer end plastic sealing portion and the sealing cover jointly cover the open mouth.

[0029] According to some embodiments of the present utility model, the stator assembly includes a stator and a plastic sealing member, the stator and the plastic sealing member are integrally injection molded, the plastic sealing member includes an outer end plastic sealing portion, the outer end plastic sealing portion is located on the side of the stator facing the open mouth of the concave cavity, and fixing holes for installing and fixing the stator assembly are formed on the outer end plastic sealing portion.

[0030] According to some embodiments of the present utility model, a receiving groove is formed on the outer end plastic sealing portion, fixing holes are formed on the bottom wall of the receiving groove, and a gasket is provided in the receiving groove.

[0031] An air conditioner according to an embodiment of the third aspect of the present utility model includes: an external rotor fan according to an embodiment of the second aspect of the present utility model.

[0032] By including an external rotor fan according to an embodiment of the second aspect of the present utility model, the air conditioner according to an embodiment of the present utility model occupies a relatively small space.

[0033] According to some embodiments of the present utility model, the air conditioner includes an indoor unit and an outdoor unit, wherein the outdoor unit includes the external rotor fan.

[0034] The additional aspects and advantages of the present utility model will be partly given in the following description, partly become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0035] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0036] Figure 1 is the front view of an external rotor fan according to some embodiments of the present utility model;

[0037] Figure 2 is Figure 1 the sectional view taken along line A-A in

[0038] Figure 3 is the rear view of an external rotor impeller according to some embodiments of the present utility model;

[0039] Figure 4 is Figure 3 the sectional view taken along line B-B in

[0040] Figure 5 is Figure 4 the enlarged view at C in

[0041] Figure 6 is Figure 3 the top view of the external rotor impeller in

[0042] Figure 7 is Figure 6 the sectional view taken along line E-E in

[0043] Figure 8 is Figure 7 the enlarged view at F in

[0044] Figure 9 is Figure 2 the schematic diagram of the rotor core in

[0045] Figure 10 is Figure 2Schematic diagram of the middle permanent magnet.

[0046] Reference numerals:

[0047] 101, external rotor fan; 100, external rotor wind wheel;

[0048] 10, wind wheel; 11, hub; 12, blade; 13, concave cavity; 14, embedding cavity; 15, opening; 16, first wall surface; 17, second wall surface; 18, third wall surface; 19, fourth wall surface; 20, fifth wall surface; 21, sixth wall surface; 22, connecting rib; 23, outer hub part; 24, inner hub part; 25, hub connecting part; 26, radial reinforcing rib; 27, through hole; 28, mounting protrusion; 29, open mouth; 30, bearing cavity;

[0049] 40, external rotor; 41, rotor core; 42, permanent magnet; 43, permanent magnet sheet; 44, first surface; 45, second surface; 46, anti-rotation groove;

[0050] 50, rotating shaft; 51, shaft sleeve; 52, rolling bearing; 53, locking nut;

[0051] 60, stator assembly; 61, stator; 62, plastic seal; 63, outer plastic seal part; 64, sealing cover; 65, waterproof cover. Detailed implementation manners

[0052] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0053] Reference is made below to Figures 1 - 10 Describe the external rotor wind wheel 100 according to an embodiment of the present utility model.

[0054] The external rotor wind wheel 100 according to the first aspect embodiment of the present utility model includes: a wind wheel 10 and an external rotor 40.

[0055] Reference is made to Figure 3, the wind wheel 10 includes a hub 11 and a plurality of blades 12 provided on the outer peripheral wall of the hub 11. A concave cavity 13 is formed on one axial side of the hub 11, and the wind wheel 10 is a plastic part. By forming the concave cavity 13 on one axial side of the hub 11, the outer rotor 40 can be accommodated in the concave cavity 13 of the hub 11, and the outer rotor 40 can be integrated into the hub 11 on the wind wheel 10, effectively utilizing the internal space of the hub 11, reducing the overall space occupied by the motor of the outer rotor fan 101 and the wind wheel 10, making the structure of the outer rotor fan 101 compact and small in size; and, by integrally injecting the rotor core 41, the magnet 42 and the wind wheel 10, the reliability of the entire hub 11 structure can be enhanced, and the assembly process between the wind wheel 10, the rotor core 41 and the magnet 42 can be omitted, improving production efficiency and making the overall structure of the outer rotor wind wheel 100 more stable and reliable.

[0056] For example, the wind wheel 10 can be an axial flow wind wheel 10.

[0057] For example, referring to Figure 3 , the concave cavity 13 has a bottom wall of the concave cavity 13 and a side wall of the concave cavity 13. The side wall of the concave cavity 13 is annularly arranged around and connected to the bottom wall of the concave cavity 13. An open mouth 29 of the concave cavity 13 is surrounded on the side of the side wall of the concave cavity 13 away from the bottom wall of the concave cavity 13.

[0058] Optionally, referring to Figure 3 , the number of the blades 12 is n, and the value of n ranges from 3 to 10. For example, n can be 3, 5, 7, 9, 10, etc. By making the number n of the blades 12 not less than 3, the blades 12 can have sufficient power to blow or suck the air flow; by making the number n of the blades 12 not greater than 10, it is possible to avoid the excessive weight of the blades 12 increasing the load on the motor bracket and reduce the material of the blades 12 to save costs.

[0059] Optionally, referring to Figure 3 and Figure 4 , the blade 12 is provided with an inner edge and an outer edge, and the inner edge is connected to the hub 11. The blade 12 is provided with a windward side and a leeward side. The blade 12 is in the shape of a curved panel, and the blade 12 is first recessed towards the leeward side and then towards the windward side in the direction from the inner edge to the outer edge. By making the blade 12 first recessed towards the leeward side and then towards the windward side in the direction from the inner edge to the outer edge, when the blade 12 rotates, the air is guided by the blade 12 to move towards the windward side of the blade 12, and the blade 12 blows out the air.

[0060] Furthermore, referring to Figure 3 and Figure 4, the length of the outer edge in the circumferential direction is greater than the length of the inner edge in the circumferential direction. By making the length of the outer edge of the blade 12 in the circumferential direction greater than the length of the inner edge in the circumferential direction, the area of the blade 12 can be increased, and the air guiding ability of the blade 12 can be enhanced.

[0061] Furthermore, referring to Figure 3 and Figure 4 , the blade 12 is provided with a leading edge and a trailing edge. The leading edge, inner edge, trailing edge, and outer edge are connected end to end to form a complete outline of the blade 12.

[0062] The outer rotor 40 is disposed in the concave cavity 13 and the outer rotor 40 is fixed to the hub 11. The outer rotor 40 includes a rotor core 41 and a permanent magnet 42 disposed on the rotor core 41. The rotor core 41, the permanent magnet 42, and the wind wheel 10 are injection-molded into one body. By injection-molding the rotor core 41, the permanent magnet 42, and the wind wheel 10 into one body, the reliability of the entire hub 11 structure can be enhanced, the production efficiency can be improved, and at the same time, the structure of the outer rotor wind wheel 100 becomes more stable and reliable.

[0063] Optionally, referring to Figure 5 , the rotor core 41 is completely embedded in the peripheral wall of the concave cavity 13, and the permanent magnet 42 is attached to the inner wall of the rotor core 41.

[0064] Optionally, the rotor core 41 is completely embedded in the peripheral wall of the concave cavity 13, and the permanent magnet 42 is embedded in the rotor core 41.

[0065] Optionally, referring to Figure 10 , the permanent magnet 42 includes a plurality of magnet sheets 43. The plurality of magnet sheets 43 are arranged along the circumferential direction of the rotor core 41. The number of magnet sheets 43 can be an even number, and the magnetization directions of two adjacent magnet sheets 43 are opposite.

[0066] The outer rotor wind wheel 100 according to the embodiment of the present invention includes a wind wheel 10 and an outer rotor 40. The outer rotor 40 includes a rotor core 41 and a permanent magnet 42 disposed on the rotor core 41. By forming a concave cavity 13 on one axial side of the hub 11, the outer rotor 40 can be accommodated in the concave cavity 13 of the hub 11, and the outer rotor 40 can be integrated into the hub 11 on the wind wheel 10, effectively utilizing the internal space of the hub 11, reducing the overall space occupied by the motor of the outer rotor fan 101 and the wind wheel 10, making the structure of the outer rotor fan 101 compact and small in volume; and, by injection-molding the rotor core 41, the permanent magnet 42, and the wind wheel 10 into one body, the reliability of the entire hub 11 structure can be enhanced, and the assembly process between the wind wheel 10 and the rotor core 41 and the permanent magnet 42 can be omitted, improving the production efficiency, and at the same time making the overall structure of the outer rotor wind wheel 100 more stable and reliable.

[0067] According to some embodiments of the present invention, referring toFigure 2 and Figure 5 , at least a part of the outer rotor 40 is embedded in the peripheral wall of the concave cavity 13. For example, the rotor core 41 is completely accommodated in the peripheral wall of the concave cavity 13, and the magnet 42 is attached to the inner peripheral wall of the rotor core 41, and the magnet 42 is not accommodated in the peripheral wall of the concave cavity 13; for another example, both the rotor core 41 and the magnet 42 are accommodated in the peripheral wall of the concave cavity 13. By embedding at least a part of the outer rotor 40 in the peripheral wall of the concave cavity 13, the outer rotor 40 can make full use of the space of the concave cavity 13, improving the space utilization rate; and, the connection between the outer rotor 40 and the hub 11 can be made more stable.

[0068] According to some embodiments of the present utility model, referring to Figure 2 and Figure 5 , the rotor core 41 is embedded in the peripheral wall of the concave cavity 13. By embedding the rotor core 41 in the peripheral wall of the concave cavity 13, the rotor core 41 can make full use of the space of the concave cavity 13, improving the space utilization rate; and, the connection between the rotor core 41 and the hub 11 can be made more stable.

[0069] According to some embodiments of the present utility model, referring to Figure 2 , Figure 9 and Figure 10 , the rotor core 41 is in a circular ring shape, the magnet 42 includes a plurality of magnet sheets 43, the plurality of magnet sheets 43 are arranged on the inner peripheral surface of the rotor core 41, an embedding cavity 14 is formed in the peripheral wall of the concave cavity 13, the embedding cavity 14 is in a circular ring shape extending along the circumferential direction of the hub 11, and the rotor core 41 is accommodated in the embedding cavity 14. The peripheral wall and the side wall of the rotor core 41 abut against the wall of the embedding cavity 14, and the embedding cavity 14 prevents the rotor core 41 from moving relative to the hub 11. By accommodating the rotor core 41 in the embedding cavity 14, the hub 11 can limit the rotor core 41 more fully.

[0070] Wherein, an opening 15 communicating with the embedding cavity 14 is formed on the inner peripheral surface of the concave cavity 13, the number of the openings 15 is the same as and corresponds one-to-one to the number of the magnet sheets 43, and each magnet sheet 43 is accommodated in the corresponding opening 15. The side of the magnet sheet 43 abuts against the side wall of the opening 15, and the side wall of the opening 15 prevents the magnet sheet 43 from moving or rotating relative to the hub 11. By making the number of the openings 15 the same as and corresponding one-to-one to the number of the magnet sheets 43, and each magnet sheet 43 is accommodated in the corresponding opening 15, the hub 11 can limit the magnet sheet 43 more fully.

[0071] According to some embodiments of the present utility model, referring to Figure 2, the concave cavity 13 has a first wall surface 16 and a second wall surface 17 that are radially opposite to each other. The second wall surface 17 surrounds the outer peripheral side of the first wall surface 16. The inner peripheral surface of the rotor core 41 is attached to the first wall surface 16, and the outer peripheral surface of the rotor core 41 is attached to the second wall surface 17. The opening 15 penetrates the first wall surface 16 along the radial direction of the rotor core 41. By attaching the inner peripheral surface of the rotor core 41 to the first wall surface 16 and the outer peripheral surface of the rotor core 41 to the second wall surface 17, the rotor core 41 can be limited in the radial direction, preventing the rotor core 41 from moving radially relative to the hub 11, making the limitation of the hub 11 on the rotor core 41 more sufficient.

[0072] According to some embodiments of the present invention, referring to Figure 2 , the concave cavity 13 further has a third wall surface 18 and a fourth wall surface 19 that are axially opposite to each other. One of the two axial end faces of the rotor core 41 is attached to the third wall surface 18, and the other of the two axial end faces of the rotor core 41 is attached to the fourth wall surface 19. For example, the axial end face of the rotor core 41 away from the open end 29 of the concave cavity 13 is attached to the third wall surface 18, and the axial end face of the rotor core 41 close to the opening 15 of the concave cavity 13 is attached to the fourth wall surface 19. By attaching one of the two axial end faces of the rotor core 41 to the third wall surface 18 and the other of the two axial end faces of the rotor core 41 to the fourth wall surface 19, the rotor core 41 can be limited in the axial direction of the rotor core 41, avoiding the rotor core 41 from moving axially relative to the hub 11, making the limitation of the hub 11 on the rotor core 41 more sufficient.

[0073] According to some embodiments of the present invention, referring to Figure 2 , the opening 15 has a fifth wall surface 20 and a sixth wall surface 21 that are axially opposite to each other along the hub 11. The two surfaces of the magnetic steel sheet 43 in the axial direction of the hub 11 are respectively a first surface 44 and a second surface 45. The first surface 44 is attached to the fifth wall surface 20, and the second surface 45 is attached to the sixth wall surface 21. For example, the fifth wall surface 20 and the sixth wall surface 21 are axially opposite to each other along the hub 11. The fifth wall surface 20 is farther from the open end 29 than the sixth wall surface 21. The first surface 44 and the second surface 45 are axially opposite to each other along the hub 11. The first surface 44 is farther from the open end 29 than the second surface 45. The first surface 44 is attached to the fifth wall surface 20, and the second surface 45 is attached to the sixth wall surface 21. By attaching the first surface 44 to the fifth wall surface 20 and the second surface 45 to the sixth wall surface 21, the magnetic steel sheet 43 can be limited in the axial direction of the rotor core 41, avoiding the magnetic steel sheet 43 from moving axially relative to the hub 11, making the limitation of the hub 11 on the magnetic steel sheet 43 more sufficient.

[0074] According to some embodiments of the present invention, referring to Figure 5, a connecting rib 22 is defined between two adjacent openings 15, and the connecting rib 22 forms the side wall of the opening 15 in the circumferential direction of the hub 11. By defining the connecting rib 22 between two adjacent openings 15, the side wall of the magnet steel sheet 43 in the circumferential direction can be abutted against the side wall of the connecting rib 22 in the circumferential direction, and the connecting rib 22 performs circumferential limitation on the magnet steel sheet 43 to prevent the magnet steel sheet 43 from rotating relative to the hub 11.

[0075] According to some embodiments of the present invention, referring to Figure 2 , the hub 11 includes an outer hub portion 23, an inner hub portion 24, and a hub connecting portion 25. The outer hub portion 23 is cylindrical and the outer hub portion 23 is sleeved on the outer peripheral side of the inner hub portion 24. One axial end of the outer hub portion 23 is connected to one axial end of the inner hub portion 24 through the hub connecting portion 25. By making the hub 11 include the outer hub portion 23, the inner hub portion 24, and the hub connecting portion 25, the weight of the hub 11 is smaller and the structural strength is higher.

[0076] A concave cavity 13 is defined in the inner hub portion 24. Components such as the outer rotor 40 and the stator 61 can be accommodated in the concave cavity 13. By making the concave cavity 13 defined in the inner hub portion 24, the inner hub portion 24 can have sufficient space to accommodate components such as the outer rotor 40, the stator 61, and the motor, reducing the axial length of the outer rotor wind wheel 100, which is beneficial to the miniaturization of related equipment such as air conditioners.

[0077] According to some embodiments of the present invention, referring to Figure 1 , the hub 11 further includes a radially extending radial reinforcing rib 26. The radially inner end of the radial reinforcing rib 26 is connected to the other axial end of the inner hub portion 24, and the radially outer end of the radial reinforcing rib 26 is connected to the inner peripheral wall of the outer hub portion 23. By making the radially inner end of the radial reinforcing rib 26 connected to the other axial end of the inner hub portion 24 and the radially outer end of the radial reinforcing rib 26 connected to the inner peripheral wall of the outer hub portion 23, the structural strength of the inner hub portion 24 and the outer hub portion 23 can be improved.

[0078] There are a plurality of radial reinforcing ribs 26, and the plurality of radial reinforcing ribs 26 are arranged at intervals in the circumferential direction of the inner hub portion 24. By making the plurality of radial reinforcing ribs 26 arranged at intervals in the circumferential direction of the inner hub portion 24, the improvement of the structural strength of the inner hub portion 24 and the outer hub portion 23 by the radial reinforcing ribs 26 can be more sufficient.

[0079] Optionally, the number of the radial reinforcing ribs 26 is x, and the value of x can be 3 to 15. For example, the value of x can be 3, 5, 7, 9, 10, 12, 15, etc. By making the number of the radial reinforcing ribs 26 no less than 3, it can be ensured that the radial reinforcing ribs 26 can have sufficient reinforcing ability, and the structural strength of the inner hub portion 24 and the outer hub portion 23 can be more fully improved; by making the number of the radial reinforcing ribs 26 no more than 15, the cost can be reduced while ensuring that the structural strength of the inner hub portion 24 and the outer hub portion 23 can be fully improved, and the weight of the outer rotor wind wheel 100 can be appropriately reduced, and the load on the motor bracket can be reduced.

[0080] According to some embodiments of the present invention, referring to Figure 1 , in the direction from the inner hub portion 24 to the outer hub 11, the axial height of the radial reinforcing rib 26 gradually increases. The axial height of the inner hub 11 is small, and the axial height of the outer hub portion 23 is large. By making the axial height of the radial reinforcing rib 26 gradually increase in the direction from the inner hub portion 24 to the outer hub portion 23, the radial reinforcing rib 26 can be more easily connected to the inner hub 11 and the outer hub 11 respectively.

[0081] Radial reinforcing rib 26 Radial reinforcing rib 26 Radial reinforcing rib 26

[0082] According to some embodiments of the present invention, referring to Figure 9 , the rotor core 41 is in a circular ring shape, an anti-rotation groove 46 is formed on the rotor core 41, and a protrusion is formed on the hub 11, and the protrusion is embedded in the anti-rotation groove 46. By making a protrusion formed on the hub 11 and an anti-rotation groove 46 formed on the rotor core 41, and making the protrusion on the hub 11 embedded in the anti-rotation groove 46 of the rotor core 41, the connection stability and reliability between the rotor core 41 and the hub 11 can be further enhanced, and since the side wall of the protrusion and the anti-rotation groove 46 abuts against each other in the circumferential direction of the rotor core 41, the limiting of the rotor core 41 can be better realized, and the rotation of the rotor core 41 relative to the hub 11 can be better avoided.

[0083] According to some embodiments of the present invention, referring to Figure 9 , the anti-rotation groove 46 is a notch formed at one axial end of the rotor core 41. By making the anti-rotation groove 46 formed at one axial end of the rotor core 41, it is convenient for the formation of the anti-rotation groove 46, and the influence of the anti-rotation groove 46 on the performance of the rotor core 41 can be reduced.

[0084] According to some embodiments of the present invention, referring to Figure 9, there are multiple anti-rotation grooves 46, and the multiple anti-rotation grooves 46 are arranged at intervals along the circumferential direction of the rotor core 41. For example, there may be two anti-rotation grooves 46, and the two anti-rotation grooves 46 are arranged at intervals along the circumferential direction of the rotor core 41. Correspondingly, there are also two anti-rotation protrusions, and the two anti-rotation protrusions are respectively received in the middle of the two anti-rotation grooves 46. By matching the multiple anti-rotation grooves 46 with the anti-rotation protrusions, the hub 11 can limit the rotor core 41 more fully, and avoid the rotor core 41 rotating circumferentially relative to the hub 11.

[0085] According to some embodiments of the present invention, referring to Figure 8 , the outer diameter of the rotor core 41 is R, and the value range of R is 50 mm to 200 mm. For example, the value of the outer diameter R of the rotor core 41 can be 50 mm, 70 mm, 100 mm, 120 mm, 150 mm, 180 mm, 200 mm, etc. By making the value of the outer diameter R of the rotor core 41 not less than 50 mm, the rotor core 41 can be large enough, and there is enough space for the rotor core 41 to place the magnet sheets 43; by making the outer diameter R of the rotor core 41 not greater than 200 mm, it can be avoided that the hub 11 cooperating with the rotor core 41 is too large, and the hub 11 occupies too much volume, which is beneficial to the miniaturization of equipment such as air conditioners.

[0086] According to some embodiments of the present invention, referring to Figure 8 , the rotor core 41 is in an annular shape, the magnet 42 includes multiple magnet sheets 43, the multiple magnet sheets 43 are arranged on the inner circumferential surface of the rotor core 41, and the radial thickness of the rotor core 41 is a, and the value range of a is 1 mm to 40 mm. For example, the value of a can be 1 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, etc. By making the value of a not less than 1 mm, the rotor core 41 can have sufficient structural strength to avoid the rotor core 41 from breaking or twisting; by making the value of a not greater than 40 mm, it can be avoided that the rotor core 41 is too large, resulting in the hub 11 cooperating with the rotor core 41 being too large, and the hub 11 occupies too much volume, which is beneficial to the miniaturization of equipment such as air conditioners.

[0087] According to some embodiments of the present invention, referring to Figure 8, the rotor core 41 is annular, the magnet 42 includes a plurality of magnet sheets 43, the plurality of magnet sheets 43 are arranged on the inner peripheral surface of the rotor core 41, the radial thickness of the magnet sheet 43 is b, and the value range of b is 2 mm to 40 mm. For example, the value of b can be 2 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, etc. By making the value of b not less than 2 mm, the volume of the magnet sheet 43 can be made large enough to accommodate sufficient magnetic force; by making the value of b not greater than 40 mm, it can be avoided that the magnet sheet 43 is too thick to be difficult to fit with the rotor core 41.

[0088] According to some embodiments of the present invention, referring to Figure 8 , the rotor core 41 is annular, the magnet 42 includes a plurality of magnet sheets 43, the plurality of magnet sheets 43 are arranged on the inner peripheral surface of the rotor core 41, the magnet sheet 43 is arc-shaped and the inner surface curvature and the outer surface curvature of the magnet sheet 43 are the same. By making the inner surface curvature and the outer surface curvature of the magnet sheet 43 the same, the processing of the magnet sheet 43 can be made more convenient.

[0089] The outer rotor fan 101 according to the second aspect embodiment of the present invention, referring to Figure 1 , includes: an outer rotor wheel 100, a stator assembly 60 and a rotating shaft 50 according to the first aspect embodiment of the present invention.

[0090] The outer rotor 40 is sleeved on the outer peripheral side of the stator assembly 60, and at least part of the stator assembly 60 is located in the concave cavity 13. The stator assembly 60 is sleeved on the outer peripheral side of the rotating shaft 50, and the rotating shaft 50 is connected to the hub 11 and fixed relative to the hub 11.

[0091] The outer rotor fan 101 according to the embodiment of the present invention, by including the outer rotor wheel 100 according to the first aspect embodiment of the present invention, the rotor core 41, the magnet 42 and the wind wheel 10 of the outer rotor wheel 100 are injection-molded into one body, so that the outer rotor wheel 100 occupies less space and has lower cost.

[0092] According to some embodiments of the present invention, referring to Figure 2 , a through hole 27 for passing through the rotating shaft 50 is formed on the bottom wall of the concave cavity 13, and the rotating shaft 50 is connected to the bottom wall of the concave cavity 13. By providing a through hole 27 for passing through the rotating shaft 50 on the bottom wall of the concave cavity 13, a placement space can be provided for the rotating shaft 50. At the same time, the through hole 27 can also limit the rotating shaft 50 to prevent relative movement between the rotating shaft 50 and the hub 11 in the radial direction.

[0093] According to some embodiments of the present invention, referring to Figure 2, a bushing 51 is installed in the through hole 27. The bushing 51 is a metal part and is fixed relative to the hub 11. The bushing 51 has a shaft hole for mating with the rotating shaft 50, and the bushing 51 is fixed relative to the rotating shaft 50. By installing the bushing 51 in the through hole 27 and making the bushing 51 a metal part, relative friction between the shaft and the hub 11 can be avoided, so that the hub 11 is not worn. For example, the hub 11 is a plastic part, and the wear resistance of the metal bushing 51 is stronger than that of the hub 11. Therefore, by installing the bushing 51 in the through hole 27 and making the bushing 51 a metal part, the service life of the hub 11 can be extended.

[0094] According to some embodiments of the present invention, referring to Figure 3 , the shaft hole is D-shaped or circular. By making the shaft hole D-shaped, the bushing 51 can limit the shaft, prevent relative rotation between the bushing 51 and the shaft, and further prevent relative rotation between the shaft and the hub 11, so that the rotation of the shaft is synchronized with the hub 11. By making the shaft hole circular, the assembly process of the shaft hole and the shaft can be more convenient.

[0095] According to some embodiments of the present invention, the bushing 51 and the hub 11 are injection-molded as one body. By injection-molding the bushing 51 and the hub 11 as one body, the connection between the bushing 51 and the hub 11 can be made more stable and reliable, preventing relative movement or relative rotation between the bushing 51 and the hub 11, and making the bushing 51 and the hub 11 relatively fixed and rotating synchronously.

[0096] According to some embodiments of the present invention, referring to Figure 2 , the external rotor fan 101 further includes a rolling bearing 52. The rolling bearing 52 is sleeved on the outer peripheral side of the rotating shaft 50 and the rolling bearing 52 is located between the rotating shaft 50 and the stator 61. One axial end of the bushing 51 abuts against the inner ring of the rolling bearing 52 axially. By providing the rolling bearing 52 in the external rotor fan 101 and making one axial end of the bushing 51 abut against the inner ring of the rolling bearing 52 axially, while the bushing 51 can rotate relative to the stator assembly 60, the axial position of the bushing 51 can be ensured to be fixed.

[0097] For example, the external rotor fan 101 includes a bushing 51 and a rolling bearing 52. One end of the bushing 51 close to the rolling bearing 52 abuts against the inner ring of the rolling bearing 52. By making one end of the bushing 51 close to the rolling bearing 52 abut against the rolling bearing 52, the rolling bearing 52 can axially limit the bushing 51, prevent the bushing 51 from moving axially towards the rolling bearing 52 along the circumferential direction, resulting in the bushing 51 falling off, and ensure that the position of the bushing 51 can be fixed.

[0098] According to some embodiments of the present invention, referring to Figure 2The outer rotor fan 101 further includes a locking nut 53, which is threadedly connected to the rotating shaft 50 and is located on the side of the sleeve 51 away from the rolling bearing 52. The locking nut 53 is located outside the concave cavity 13 and the locking nut 53 abuts against the sleeve 51 and the bottom wall of the concave cavity 13 in the axial direction. By arranging the locking nut 53 on the outer rotor fan 101 and making the locking nut 53 outside the concave cavity 13 and making the locking nut 53 abut against the sleeve 51 and the bottom wall of the concave cavity 13 in the axial direction, the locking nut 53 can limit the sleeve 51, prevent the sleeve 51 from moving in the circumferential direction away from the rolling bearing 52 and causing the sleeve 51 to fall off, and ensure that the position of the sleeve 51 can be fixed.

[0099] According to some embodiments of the present invention, reference Figure 2 The stator assembly 60 includes a stator 61 and a plastic sealing member 62, and the stator 61 and the plastic sealing member 62 are injection molded as one. By injection molding the stator 61 and the plastic sealing member 62 as one, the connection between the stator 61 and the plastic sealing member 62 can be made tighter; and a connection structure can be formed on the plastic sealing member 62 to avoid punching holes or setting a connection structure on the stator 61 to affect the performance of the stator 61. By connecting the plastic sealing member 62 with other components, the stator assembly 60 can be limited, thereby achieving the effect of fixing the stator assembly 60.

[0100] For example, the plastic packaging member 62 completely wraps the stator 61 , and the stator 61 is accommodated in the plastic packaging member 62 . By making the plastic packaging member 62 completely wrap the stator 61 , the stator 61 can be protected by the plastic packaging member 62 , thereby preventing the stator 61 from being worn or corroded and affecting its performance.

[0101] The plastic sealing member 62 includes an outer plastic sealing portion 63, Figure 2 The outer plastic sealing part 63 is located on the side of the open opening 29 of the stator 61 facing the concave cavity 13, and the outer plastic sealing part 63 covers at least part of the open opening 29, or the outer plastic sealing part 63 and the sealing cover 64 cover the open opening 29 together. By making the outer plastic sealing part 63 cover at least part of the open opening 29, or the outer plastic sealing part 63 and the sealing cover 64 cover the open opening 29 together, part of the plastic sealing part 62 of the stator 61 can be used as at least part of the end cover of the outer rotor fan 101, or part of the plastic sealing part 62 of the stator 61 and the sealing cover 64 can be used together as at least part of the end cover of the outer rotor fan 101, so as to cover the open opening 29 of the hub 11 and prevent external dust and water from entering the inner part of the outer rotor fan 101 through the open opening 29.

[0102] For example, a bearing cavity 30 is defined inside the stator assembly 60. The rotating shaft 50 passes through the bearing cavity 30. A bearing is provided in the bearing cavity 30 and sleeved on the outer peripheral side of the rotating shaft 50. The sealing cover 64 is circular. The sealing cover 64 covers one side of the bearing cavity 30 facing the open port 29. The outer end plastic sealing part 63 is annular. The outer end plastic sealing part 63 is disposed around the outer peripheral side of the sealing cover 64. The sealing cover 64 and the outer end plastic sealing part 63 jointly seal the open port 29 to prevent external dust or water from entering the interior of the external rotor blower 101 through the open port 29.

[0103] Furthermore, the external rotor blower 101 further includes a waterproof cover 65. The outer end plastic sealing part 63 is annular. The waterproof cover 65 surrounds the outside of the outer end plastic sealing part 63 and is in clearance fit with the outer end plastic sealing part 63. A plurality of mounting protrusions 28 are provided on the hub 11. Correspondingly, a plurality of mounting grooves are provided on the waterproof cover 65. Each mounting protrusion 28 is received in a corresponding mounting groove, so that the waterproof cover 65 is fixed relative to the hub 11. The waterproof cover 65, the outer end plastic sealing part 63 and the sealing cover 64 jointly seal the open port 29 to prevent external dust or water from entering the interior of the external rotor blower 101 through the open port 29.

[0104] According to some embodiments of the present invention, the stator assembly 60 includes a stator 61 and a plastic sealing member 62. The stator 61 and the plastic sealing member 62 are injection-molded into one body. The plastic sealing member 62 includes an outer end plastic sealing part 63. The outer end plastic sealing part 63 is located on one side of the stator 61 facing the open port 29 of the concave cavity 13. Fixing holes for installing and fixing the stator assembly 60 are formed on the outer end plastic sealing part 63. By the outer end plastic sealing part 63 being located on one side of the stator 61 facing the open port 29 of the concave cavity 13 and fixing holes for installing and fixing the stator assembly 60 being formed on the outer end plastic sealing part 63, the outer end plastic sealing part 63 can be fixed to other components, thereby fixing the external rotor blower 101. For example, fixing holes are formed on the outer end plastic sealing part 63, and the outer end plastic sealing part 63 is fixedly connected to the motor bracket by screws, thereby fixing the external rotor blower 101 to the motor bracket.

[0105] According to some embodiments of the present invention, a receiving groove is formed on the outer end plastic sealing part 63. Fixing holes are formed on the bottom wall of the receiving groove. A gasket is provided in the receiving groove. For example, the gasket can be a rubber gasket. By providing a gasket in the receiving groove, the gasket has a buffering effect, which can prevent wear from occurring when the outer end plastic part is connected to other components, resulting in connection failure, and can extend the service life of the outer end plastic part. For example, the outer end plastic part is connected to the motor bracket, and the motor bracket abuts against the gasket. The gasket can prevent insufficient connection strength or connection failure caused by wear of the outer end plastic part and extend the service life of the outer end plastic part.

[0106] The air conditioner according to the third aspect embodiment of the present invention includes: the external rotor blower 101 according to the second aspect embodiment of the present invention.

[0107] An air conditioner according to an embodiment of the present utility model includes an external rotor fan 101 according to an embodiment of the second aspect of the present utility model. The external rotor fan 101 includes an external rotor impeller 100 according to an embodiment of the first aspect of the present utility model. The rotor core 41, the permanent magnet 42 and the impeller 10 of the external rotor impeller 100 are integrally injection-molded, so that the external rotor impeller 100 occupies a relatively small space.

[0108] According to some embodiments of the present utility model, the air conditioner includes an indoor unit of the air conditioner and an outdoor unit of the air conditioner, wherein the outdoor unit of the air conditioner includes an external rotor fan 101.

[0109] For example, the air conditioner is a split air conditioner. The air conditioner includes an indoor unit of the air conditioner and an outdoor unit of the air conditioner. The outdoor unit of the air conditioner includes an external rotor fan 101 and a motor bracket. The stator assembly 60 of the external rotor fan 101 is connected to the motor bracket, and the motor bracket fixes the external rotor fan 101 inside the outdoor unit of the air conditioner.

[0110] The following refers to Figures 1 - 10 Describe the external rotor fan 101 and the air conditioner according to some embodiments of the present utility model.

[0111] Refer to Figures 1 - 10 , in this embodiment, the external rotor impeller 100 includes: an impeller 10 and an external rotor 40. The impeller 10 is an axial flow impeller 10. The impeller 10 includes a hub 11 and three blades 12 provided on the outer peripheral wall of the hub 11. A concave cavity 13 is formed on one axial side of the hub 11. The impeller 10 is a plastic part. The blade 12 is provided with an inner edge and an outer edge, and the inner edge is connected to the hub 11. The blade 12 is provided with a windward side and a leeward side. The blade 12 is in the shape of a curved panel. The blade 12 is first recessed toward the leeward side and then recessed toward the windward side in the direction from the inner edge to the outer edge. The length of the outer edge in the circumferential direction is greater than the length of the inner edge in the circumferential direction. The blade 12 is provided with a leading edge and a trailing edge. The leading edge, the inner edge, the trailing edge and the outer edge are connected end to end to form a complete blade 12 profile.

[0112] The outer rotor 40 is disposed in the concave cavity 13 and fixed to the hub 11, and at least a part of the outer rotor 40 is embedded in the peripheral wall of the concave cavity 13. The outer rotor 40 includes a rotor core 41 and a permanent magnet 42 disposed on the rotor core 41, and the rotor core 41, the permanent magnet 42 and the wind wheel 10 are integrally injection-molded. The rotor core 41 is embedded in the peripheral wall of the concave cavity 13. The rotor core 41 is in a circular ring shape, the permanent magnet 42 includes a plurality of magnet sheets 43, the plurality of magnet sheets 43 are disposed on the inner peripheral surface of the rotor core 41, an embedding cavity 14 is formed in the peripheral wall of the concave cavity 13, the embedding cavity 14 is in a circular ring shape extending along the circumferential direction of the hub 11, and the rotor core 41 is received in the embedding cavity 14. The concave cavity 13 has a first wall surface 16 and a second wall surface 17 that are opposite to each other in the radial direction, the second wall surface 17 surrounds the outer peripheral side of the first wall surface 16, the inner peripheral surface of the rotor core 41 is attached to the first wall surface 16, the outer peripheral surface of the rotor core 41 is attached to the second wall surface 17, and the opening 15 penetrates through the first wall surface 16 along the radial direction of the rotor core 41. The concave cavity 13 further has a third wall surface 18 and a fourth wall surface 19 that are opposite to each other in the axial direction, one of the two axial end surfaces of the rotor core 41 is attached to the third wall surface 18, and the other of the two axial end surfaces of the rotor core 41 is attached to the fourth wall surface 19.

[0113] An opening 15 communicating with the embedding cavity 14 is formed in the inner peripheral surface of the concave cavity 13, the number of the openings 15 is the same as and corresponds to the number of the magnet sheets 43 one by one, and each magnet sheet 43 is received in the corresponding opening 15. A connecting rib 22 is defined between two adjacent openings 15, and the connecting rib 22 constitutes the side wall of the opening 15 in the circumferential direction of the hub 11. The number of the magnet sheets 43 is 14, and the magnetization directions of two adjacent magnet sheets 43 are opposite. The opening 15 has a fifth wall surface 20 and a sixth wall surface 21 that are opposite to each other in the axial direction of the hub 11, the two surfaces of the magnet sheet 43 in the axial direction of the hub 11 are respectively a first surface 44 and a second surface 45, the first surface 44 is attached to the fifth wall surface 20, and the second surface 45 is attached to the sixth wall surface 21.

[0114] The hub 11 includes an outer hub portion 23, an inner hub portion 24 and a hub connecting portion 25, the outer hub portion 23 is in a cylindrical shape and sleeved on the outer peripheral side of the inner hub portion 24, one axial end of the outer hub portion 23 is connected to one axial end of the inner hub portion 24 through the hub connecting portion 25, and the concave cavity 13 is defined in the inner hub portion 24. The hub 11 further includes a radially extending radial reinforcing rib 26, the radially inner end of the radial reinforcing rib 26 is connected to the other axial end of the inner hub portion 24, and the radially outer end of the radial reinforcing rib 26 is connected to the inner peripheral wall of the outer hub portion 23. The number of the radial reinforcing ribs 26 is six, the six radial reinforcing ribs 26 are arranged at intervals along the circumferential direction of the inner hub portion 24, and in the direction from the inner hub portion 24 to the outer hub 11, the axial height of the radial reinforcing rib 26 gradually increases.

[0115] The rotor core 41 is annular. An anti-rotation groove 46 is formed on the rotor core 41. A protrusion is formed on the hub 11, and the protrusion is embedded in the anti-rotation groove 46. The anti-rotation groove 46 is a notch formed at one axial end of the rotor core 41. There are two anti-rotation grooves 46, and the two anti-rotation grooves 46 are arranged at intervals along the circumferential direction of the rotor core 41. The outer diameter of the rotor core 41 is R, and the value range of R is from 50 mm to 200 mm. The rotor core 41 is annular. The magnet 42 includes a plurality of magnet sheets 43, and the plurality of magnet sheets 43 are arranged on the inner circumferential surface of the rotor core 41. The radial thickness of the rotor core 41 is a, and the value range of a is from 1 mm to 40 mm, or the radial thickness of the magnet sheet 43 is b, and the value range of b is from 2 mm to 40 mm. The plurality of magnet sheets 43 are arranged on the inner circumferential surface of the rotor core 41. The magnet sheet 43 is arc-shaped and the radian of the inner surface and the outer surface of the magnet sheet 43 is the same.

[0116] The outer-rotor fan 101 includes an outer-rotor wind wheel 100, a stator assembly 60, and a rotating shaft 50 according to the embodiment of the first aspect of the present invention. The outer rotor 40 is sleeved on the outer peripheral side of the stator assembly 60, and at least part of the stator assembly 60 is located in the concave cavity 13. The stator assembly 60 is sleeved on the outer peripheral side of the rotating shaft 50, and the rotating shaft 50 is connected to the hub 11. A through hole 27 for passing through the rotating shaft 50 is formed on the bottom wall of the concave cavity 13, and the rotating shaft 50 is connected to the bottom wall of the concave cavity 13. A bush 51 is installed in the through hole 27. The bush 51 is a metal part. The bush 51 is fixed relative to the hub 11. The bush 51 has a shaft hole for cooperating with the rotating shaft 50, and the bush 51 is fixed relative to the rotating shaft 50. The shaft hole is D-shaped or circular. The bush 51 and the hub 11 are injection-molded as one body. The outer-rotor fan 101 further includes a rolling bearing 52. The rolling bearing 52 is sleeved on the outer peripheral side of the rotating shaft 50 and is located between the rotating shaft 50 and the stator 61. One axial end of the bush 51 abuts against the inner ring of the rolling bearing 52 axially. The outer-rotor fan 101 further includes a lock nut 53. The lock nut 53 is threadedly connected to the rotating shaft 50 and is located on the side of the bush 51 away from the rolling bearing 52. The lock nut 53 is located outside the concave cavity 13 and abuts against both the bush 51 and the bottom wall of the concave cavity 13 axially. The stator assembly 60 includes a stator 61 and a plastic-sealed part 62, and the stator 61 and the plastic-sealed part 62 are injection-molded as one body.

[0117] The outer plastic-sealed part 63 is located on the side of the stator 61 facing the open mouth 29 of the concave cavity 13. The outer plastic-sealed part 63 and the sealing cover 64 jointly seal the open mouth 29. A fixing hole for installing and fixing the stator assembly 60 is formed on the outer plastic-sealed part 63. A receiving groove is formed on the outer plastic-sealed part 63. A fixing hole is formed on the bottom wall of the receiving groove, and a metal gasket is provided in the receiving groove.

[0118] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0119] In the description of the present utility model, the "first feature" and the "second feature" may include one or more of such features.

[0120] In the description of the present utility model, the meaning of "a plurality of" is two or more.

[0121] In the description of the present utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0122] In the description of the present utility model, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0123] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0124] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. An outer rotor wind wheel, characterized in that: include: A wind wheel, comprising a hub and a plurality of blades arranged on the outer peripheral wall of the hub, a concave cavity is formed on one axial side of the hub, and the wind wheel is a plastic part; The outer rotor is arranged in the concave cavity and fixed to the hub. The outer rotor includes a rotor core and a magnetic steel arranged on the rotor core. The rotor core, the magnetic steel and the wind wheel are injection molded as a whole.

2. The outer rotor wind wheel according to claim 1, characterized in that: At least a portion of the outer rotor is embedded in the peripheral wall of the concave cavity.

3. The outer rotor wind wheel according to claim 2, characterized in that: The rotor core is embedded in the peripheral wall of the concave cavity.

4. The outer rotor wind wheel according to claim 3, characterized in that: The rotor core is in a circular ring shape, and the magnetic steel includes a plurality of magnetic steel sheets, which are arranged on the inner circumferential surface of the rotor core. An embedding cavity is formed in the circumferential wall of the concave cavity. The embedding cavity is in a circular ring shape extending along the circumferential direction of the hub. The rotor core is accommodated in the embedding cavity, and an opening connected to the embedding cavity is formed on the inner circumferential surface of the concave cavity. The number of the openings is the same as the number of the magnetic steel sheets and corresponds one to one, and each of the magnetic steel sheets is accommodated in the corresponding opening.

5. The outer rotor wind wheel according to claim 4, characterized in that: The concave cavity has a first wall surface and a second wall surface that are radially opposite to each other, the second wall surface surrounds the outer peripheral side of the first wall surface, the inner peripheral surface of the rotor core is in contact with the first wall surface, the outer peripheral surface of the rotor core is in contact with the second wall surface, and the opening passes through the first wall surface in the radial direction of the rotor core.

6. The outer rotor wind wheel according to claim 5, characterized in that: The concave cavity further has a third wall surface and a fourth wall surface which are opposite to each other in the axial direction. One of the two axial end surfaces of the rotor core is in contact with the third wall surface, and the other of the two axial end surfaces of the rotor core is in contact with the fourth wall surface.

7. The outer rotor wind wheel according to claim 4, characterized in that: The opening has a fifth wall and a sixth wall which are arranged opposite to each other along the axial direction of the hub. The two surfaces of the magnetic steel sheet along the axial direction of the hub are respectively a first surface and a second surface. The first surface is in contact with the fifth wall, and the second surface is in contact with the sixth wall.

8. The outer rotor wind wheel according to claim 4, characterized in that: A connecting rib is defined between two adjacent openings, and the connecting rib constitutes a side wall of the opening along the circumferential direction of the hub.

9. The outer rotor wind wheel according to claim 1, characterized in that: The wheel hub comprises an outer wheel hub portion, an inner wheel hub portion and a wheel hub connecting portion. The outer wheel hub portion is cylindrical and is sleeved on the outer circumference of the inner wheel hub portion. An axial end of the outer wheel hub portion is connected to an axial end of the inner wheel hub portion via the wheel hub connecting portion, and the concave cavity is defined in the inner wheel hub portion.

10. The outer rotor wind wheel according to claim 9, characterized in that: The wheel hub also includes radially extending radial reinforcing ribs, wherein the radial inner end of the radial reinforcing ribs is connected to the other axial end of the inner wheel hub portion, and the radial outer end of the radial reinforcing ribs is connected to the inner circumferential wall of the outer wheel hub portion. There are multiple radial reinforcing ribs, and the multiple radial reinforcing ribs are arranged at intervals along the circumference of the inner wheel hub portion.

11. The outer rotor wind wheel according to claim 10, characterized in that: In the direction from the inner hub portion to the outer hub portion, the axial height of the radial reinforcing ribs gradually increases.

12. The outer rotor wind wheel according to claim 1, characterized in that: The rotor core is in a circular ring shape, an anti-rotation groove is formed on the rotor core, a protrusion is formed on the hub, and the protrusion is embedded in the anti-rotation groove.

13. The outer rotor wind wheel according to claim 12, characterized in that: The anti-rotation groove is a notch formed at one axial end of the rotor core; and / or, there are a plurality of anti-rotation grooves, which are spaced apart along the circumference of the rotor core.

14. The outer rotor wind wheel according to claim 1, characterized in that: The outer diameter of the rotor core is 50 mm to 200 mm.

15. The outer rotor wind wheel according to claim 1, characterized in that: The rotor core is in a circular ring shape, and the magnetic steel includes a plurality of magnetic steel sheets, which are arranged on the inner circumferential surface of the rotor core. The radial thickness of the rotor core is 1 mm to 40 mm, or the radial thickness of the magnetic steel sheets is 2 mm to 40 mm, or the magnetic steel sheets are arc-shaped and the curvature of the inner surface and the outer surface of the magnetic steel sheets are consistent.

16. An external rotor fan, characterized in that: include: The outer rotor wind wheel according to any one of claims 1 to 15; A stator assembly, wherein the outer rotor is sleeved on the outer peripheral side of the stator assembly, and at least a portion of the stator assembly is located in the concave cavity; The stator assembly is sleeved on the outer circumference of the rotating shaft, and the rotating shaft is connected to the wheel hub.

17. The outer rotor fan according to claim 16, characterized in that: The bottom wall of the concave cavity is formed with a penetration hole for penetrating a rotating shaft, and the rotating shaft is connected to the bottom wall of the concave cavity.

18. The outer rotor fan according to claim 17, characterized in that: A shaft sleeve is installed in the penetration hole. The shaft sleeve is a metal piece. The shaft sleeve is fixed relative to the wheel hub. The shaft sleeve has an axial hole matched with the rotating shaft. The shaft sleeve is fixed relative to the rotating shaft.

19. The outer rotor fan according to claim 18, characterized in that: The shaft hole is D-shaped or circular; and / or the shaft sleeve and the wheel hub are injection molded as one piece.

20. The outer rotor fan according to claim 18, characterized in that: It also includes a rolling bearing, which is sleeved on the outer peripheral side of the rotating shaft and located between the rotating shaft and the stator, and one axial end of the sleeve is axially abutted against the inner ring of the rolling bearing; the outer rotor fan also includes a locking nut, which is threadedly connected to the rotating shaft and is located on the side of the sleeve away from the rolling bearing, and the locking nut is located outside the concave cavity and is axially abutted against the sleeve and the bottom wall of the concave cavity.

21. The outer rotor fan according to claim 16, characterized in that: The stator assembly includes a stator and a plastic sealing part, wherein the stator and the plastic sealing part are injection molded as one body, and the plastic sealing part includes an outer end plastic sealing part, wherein the outer end plastic sealing part is located on a side of an open opening of the stator facing the concave cavity, and the outer end plastic sealing part covers at least a portion of the open opening, or the outer end plastic sealing part and a sealing cover jointly cover the open opening.

22. The outer rotor fan according to claim 16, characterized in that: The stator assembly includes a stator and a plastic sealing part, wherein the stator and the plastic sealing part are injection molded as one piece, and the plastic sealing part includes an outer end plastic sealing part, wherein the outer end plastic sealing part is located on a side of an open opening of the stator facing the concave cavity, and a fixing hole for installing and fixing the stator assembly is formed on the outer end plastic sealing part.

23. The outer rotor fan according to claim 22, characterized in that: An accommodating groove is formed on the outer end plastic sealing portion, the fixing hole is formed on the bottom wall of the accommodating groove, and a gasket is arranged in the accommodating groove.

24. An air conditioner, characterized in that: include: An external rotor blower according to any one of claims 16 to 23.

25. The air conditioner according to claim 24, characterized in that: The air conditioner comprises an air conditioner indoor unit and an air conditioner outdoor unit, wherein the air conditioner outdoor unit comprises the outer rotor fan.

Images