Outer rotor motor, outer rotor fan and air conditioner

Abstract

The utility model discloses an external rotor motor, an external rotor fan and an air conditioner, the external rotor motor comprises an external rotor assembly and a stator assembly, one end of the external rotor assembly adjacent to an opening of an external rotor shell is a first matching end, and one end of the stator assembly adjacent to the opening of the external rotor shell is a second matching end. A sealing structure is arranged between the first matching end and the second matching end. According to the external rotor motor provided by the embodiment of the utility model, the first matching end is arranged at one end, close to the opening of the external rotor shell, of the external rotor assembly, the second matching end is arranged at one end, close to the opening of the external rotor shell, of the stator assembly, and the sealing structure is arranged between the first matching end and the second matching end; the sealing structure seals the gap between the stator assembly and the outer rotor shell, water and dust can be effectively prevented from entering the motor through the joint of the stator assembly and the outer rotor assembly, and the waterproof and dustproof effects are achieved.

Description

Technical Field

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

[0002] In the related art, due to the lack of an effective waterproof and dustproof design, external rotor motors often exhibit poor waterproof and dustproof performance. Water, dust and other impurities entering the motor not only affect the normal operation of the motor, but may also damage the electrical components inside the motor, thus seriously affecting the service life and reliability of the motor. Therefore, improvement is needed. 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 motor, which includes an external rotor assembly and a stator assembly. By providing a first mating end at one end of the external rotor assembly adjacent to the open end of the external rotor housing, and a second mating end at one end of the stator assembly adjacent to the open end of the external rotor housing, and having a sealing structure between the first mating end and the second mating end, the sealing structure can close the gap between the stator assembly and the external rotor housing, effectively preventing water and dust from entering the motor through the joint between the stator assembly and the external rotor assembly, and playing a role in waterproofing and dustproofing.

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

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

[0006] The external rotor motor according to the first aspect embodiment of the utility model includes: an external rotor assembly, including an external rotor housing, an external rotor and a rotating shaft, the external rotor including a rotor core and a permanent magnet, the external rotor being located inside the external rotor housing and fixed to the external rotor housing, the rotating shaft being connected to the external rotor housing, one axial side of the external rotor housing being open to form an open end and the other axial side of the external rotor housing being closed; a stator assembly, the stator assembly being located inside the external rotor housing and sleeved on the outer peripheral side of the rotating shaft, the external rotor being sleeved on the outer peripheral side of the stator assembly; wherein, one end of the external rotor assembly adjacent to the open end of the external rotor housing is a first mating end, one end of the stator assembly adjacent to the open end of the external rotor housing is a second mating end, and there is a sealing structure between the first mating end and the second mating end.

[0007] According to the external rotor motor of the embodiment of the present utility model, by providing a first mating end at one end of the external rotor assembly adjacent to the open end of the external rotor housing, and a second mating end at one end of the stator assembly adjacent to the open end of the external rotor housing, and having a sealing structure between the first mating end and the second mating end, the sealing structure closes the gap between the stator assembly and the external rotor housing, which can effectively prevent water and dust from entering the motor interior through the joint of the stator assembly and the external rotor assembly, playing a role in waterproofing and dustproofing.

[0008] According to some embodiments of the present utility model, the sealing structure includes a first sealing structure and a second sealing structure. The first sealing structure is provided on the first mating end and on the external rotor housing. The second sealing structure is provided on the second mating end and on the outer peripheral side of the stator assembly. Both the second sealing structure and the first sealing structure are annular and extend along the circumferential direction of the stator assembly. The second sealing structure is in sealing cooperation with the first sealing structure.

[0009] According to some embodiments of the present utility model, the second sealing structure includes an annular extension plate. The extension plate is connected to the outer peripheral side of the stator assembly and is disposed around the stator assembly. A mating groove is formed on the inner peripheral wall of the external rotor housing. The mating groove is annular and extends along the circumferential direction of the external rotor housing. At least a part of the extension plate is received in the mating groove.

[0010] 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 injection-molded as a whole. 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 end of the external rotor housing. The extension plate is connected to the outer peripheral wall of the outer end plastic sealing portion and is integrally injection-molded with the plastic sealing member.

[0011] According to some embodiments of the present utility model, along the radial direction of the external rotor housing, the inner peripheral wall of the mating groove has a stepped structure.

[0012] According to some embodiments of the present utility model, the first sealing structure includes a protective plate. The protective plate is provided on the external rotor housing and is annular and extends along the circumferential direction of the external rotor housing. The protective plate includes a fixing portion and a protective portion disposed along the radial direction. The fixing portion is fixed to the axial end face of the external rotor housing. In the axial direction of the stator assembly, the protective portion is located outside the extension plate.

[0013] According to some embodiments of the present utility model, a mating notch extending along the circumferential direction of the extension plate is formed on the extension plate. The protective portion is received in the mating notch.

[0014] According to some embodiments of the present utility model, the gap range between the protection part and the inner wall of the mating notch is 0 to 3 mm.

[0015] According to some embodiments of the present utility model, a positioning hole is provided on the fixing part, and a positioning protrusion is provided on the outer rotor housing, and the positioning protrusion is inserted into the positioning hole.

[0016] According to some embodiments of the present utility model, a sealing protrusion is provided on the inner side in the axial direction of the extension plate. The part of the inner wall of the mating groove that is opposite to the extension plate in the axial direction is the groove bottom wall, and a sealing groove that cooperates with the sealing protrusion is provided on the groove bottom wall. Both the sealing protrusion and the sealing groove are annular and extend along the circumferential direction of the extension plate.

[0017] According to some embodiments of the present utility model, a plurality of first sealing protrusions arranged at intervals in the radial direction are provided on the inner side in the axial direction of the extension plate. The part of the inner wall of the mating groove that is opposite to the extension plate in the axial direction is the groove bottom wall, and a plurality of second sealing protrusions arranged at intervals in the radial direction are provided on the groove bottom wall. The first sealing protrusions and the second sealing protrusions are arranged alternately in the radial direction.

[0018] According to some embodiments of the present utility model, the gap range between the first sealing protrusion and the second sealing protrusion is 0 to 3 mm.

[0019] According to some embodiments of the present utility model, the outer peripheral surface of the extension plate is the first surface, and the first surface extends obliquely toward the central axis of the stator assembly in the direction from the groove bottom wall to the open end.

[0020] According to some embodiments of the present utility model, a sealing member is provided at the outer radial end of the extension plate. The sealing member is annular and extends along the circumferential direction of the extension plate. The sealing member is located in the mating groove and is used to seal the gap between the outer radial end of the extension plate and the inner wall of the mating groove.

[0021] According to some embodiments of the present utility model, an installation groove is formed on the sealing member, and the outer radial end of the extension plate is received in the installation groove.

[0022] According to some embodiments of the present utility model, the sealing member includes a sealing ring body and a sealing lip. The sealing ring body is fixed to the outer radial end of the extension plate, and the sealing lip is connected to the sealing ring body. The sealing lip is one or a plurality arranged along the axial direction of the sealing ring. At least one of the sealing lips includes a first sealing lip, and the first sealing lip abuts against the outer rotor housing.

[0023] According to some embodiments of the present utility model, the compression amount of the first sealing lip is 0 to 2 mm.

[0024] According to some embodiments of the present utility model, an activity notch for the movement of the first sealing lip is formed on the outer peripheral surface of the sealing ring body.

[0025] According to some embodiments of the present utility model, the outer peripheral surface of the sealing ring body is the second surface, and a first gap is defined between the second surface and the side wall of the groove.

[0026] According to some embodiments of the present utility model, the part of the inner wall of the mating groove that is axially opposite to the extension plate is the bottom wall of the groove, the part of the inner wall of the mating groove that is radially opposite to the extension plate is the side wall of the groove, a sealing boss is provided at the connection between the bottom wall of the groove and the side wall of the groove, and the first sealing lip abuts against the sealing boss.

[0027] According to some embodiments of the present utility model, the sealing boss has a first step surface and a second step surface arranged at an angle, the first step surface is connected between the side wall of the groove and the second step surface, and the first sealing lip abuts against the first step surface.

[0028] According to some embodiments of the present utility model, there is an angle between the protruding direction of the first sealing lip relative to the sealing ring body and the first step surface; and / or, the first sealing lip extends obliquely in a direction approaching the bottom wall of the groove in the radially outward direction.

[0029] According to some embodiments of the present utility model, there are multiple sealing lips, and the multiple sealing lips further include a second sealing lip, the second sealing lip is arranged opposite to the second step surface, and at least part of the sealing boss is accommodated in a sealing space defined between the second sealing lip and the first sealing lip.

[0030] According to some embodiments of the present utility model, a second gap is defined between the second sealing lip and the second step surface.

[0031] According to some embodiments of the present utility model, there are multiple sealing lips, and the multiple sealing lips further include a third sealing lip, and the third sealing lip is located axially outside the first sealing lip.

[0032] According to some embodiments of the present utility model, a third gap is defined between the third sealing lip and the side wall of the groove.

[0033] According to some embodiments of the present utility model, the third sealing lip extends obliquely in a direction away from the first sealing lip in the radially outward direction.

[0034] According to some embodiments of the present utility model, an activity space for the movement of the first sealing lip is defined between the third sealing lip and the first sealing lip.

[0035] According to some embodiments of the present utility model, a bearing chamber is defined on the inner circumferential side of the stator assembly. The rotating shaft passes through the bearing chamber. The outer rotor motor includes a bearing, and the bearing is disposed in the bearing chamber and sleeved on the outer circumferential side of the rotating shaft. A sealing cover is provided on one side of the bearing chamber close to the open end, and the sealing cover is fixed to the stator assembly.

[0036] The outer rotor blower according to the second aspect embodiment of the present utility model includes: a wind wheel including a hub and a plurality of blades disposed on the outer peripheral wall of the hub; an outer rotor motor according to the first aspect embodiment of the present utility model, and the outer rotor is connected to the hub.

[0037] According to the outer rotor blower of the embodiment of the present utility model, by including the outer rotor motor according to the first aspect embodiment of the present utility model, the motor can effectively prevent water and dust from entering the interior of the motor through the joint of the stator assembly and the outer rotor assembly, playing a role in waterproofing and dustproofing.

[0038] According to some embodiments of the present utility model, a concave cavity is formed in the hub, and both the outer rotor assembly and the stator assembly are located in the concave cavity, and at least a part of the hub constitutes the outer rotor housing.

[0039] The air conditioner according to the third aspect embodiment of the present utility model includes: an outer rotor blower according to the second aspect embodiment of the present utility model.

[0040] According to the air conditioner of the embodiment of the present utility model, by including the outer rotor blower according to the second aspect embodiment of the present utility model, and the outer rotor blower includes the outer rotor motor according to the first aspect embodiment of the present utility model, the motor can effectively prevent water and dust from entering the interior of the motor through the joint of the stator assembly and the outer rotor assembly, playing a role in waterproofing and dustproofing.

[0041] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0043] Figure 1 is a schematic diagram of an outer rotor blower according to some embodiments of the present utility model;

[0044] Figure 2 isFigure 1 Front view of an external-rotor fan;

[0045] Figure 3 is Figure 2 Sectional view along line A-A in;

[0046] Figure 4 is Figure 3 Enlarged view at B in;

[0047] Figure 5 Sectional view of an external-rotor motor according to some embodiments of the present utility model;

[0048] Figure 6 is Figure 5 Enlarged view at D in;

[0049] Figure 7 Sectional view of an external-rotor motor according to some embodiments of the present utility model;

[0050] Figure 8 is Figure 7 Enlarged view at E in;

[0051] Figure 9 is Figure 7 Sectional view of the seal of the external-rotor motor in;

[0052] Figure 10 Sectional view of an external-rotor motor according to some embodiments of the present utility model;

[0053] Figure 11 is Figure 10 Enlarged view at G in;

[0054] Figure 12 is Figure 10 Sectional view of the seal of the external-rotor motor in;

[0055] Figure 13 Sectional view of an external-rotor motor according to some embodiments of the present utility model;

[0056] Figure 14 is Figure 13 Enlarged view at I in;

[0057] Figure 15 is Figure 13 Sectional view of the seal of the external-rotor motor in.

[0058] Reference numerals:

[0059] 100, external-rotor fan; 101, external-rotor motor;

[0060] 10, wind wheel; 11, hub; 12, blade;

[0061] 20. outer rotor assembly; 21. outer rotor housing; 22. outer rotor; 23. rotating shaft; 24. iron core; 25. magnetic steel; 26. open mouth; 27. first mating end;

[0062] 30. stator assembly; 31. second mating end; 32. outer end plastic sealing portion; 33. bearing chamber; 34. bearing; 36. stator; 37. plastic sealing member; 38. sealing cover;

[0063] 40. Sealing structure; 41. First sealing structure; 42. Second sealing structure; 43. Extension plate; 44. Matching groove; 45. Protective plate; 46. Fixed part; 47. Protective part; 48. Matching notch; 51. Sealing protrusion; 52. Groove bottom wall; 53. Groove side wall; 54. Sealing groove; 55. First sealing protrusion; 56. Second sealing protrusion; 57. First surface; 58. Sealing boss; 59. First step surface; 60. Second step surface; 70. Sealing element; 71. Mounting groove; 72. Sealing ring body; 73. Sealing lip; 74. Movable notch; 75. Second surface; 76. First gap; 77. Second gap; 78. Third gap; 79. First sealing lip; 80. Second sealing lip; 81. Third sealing lip; 82. Movable space. DETAILED DESCRIPTION

[0064] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0065] Reference below Figures 1 - 15 An outer rotor motor according to an embodiment of the present invention is described.

[0066] According to the outer rotor motor 101 of the first embodiment of the utility model, Figures 1 - 3 , including: an outer rotor assembly 20, a stator assembly 30 and a sealing structure 40.

[0067] The outer rotor assembly 20 includes an outer rotor shell 21, an outer rotor 22 and a rotating shaft 23. The outer rotor 22 includes a rotor core 24 and a magnetic steel 25. The outer rotor 22 is located in the outer rotor shell 21 and fixed to the outer rotor shell 21. The rotating shaft 23 is connected to the outer rotor shell 21. For example, the outer rotor shell 21 and the outer rotor 22 can be injection molded as one body. By injection molding the outer rotor shell 21 and the outer rotor 22 as one body, the connection between the outer rotor shell 21 and the outer rotor 22 is more tightly secured.

[0068] Optionally, the magnetic steel 25 is attached to the inner wall of the rotor core 24 .

[0069] Optionally, the permanent magnet 25 is embedded in the rotor core 24.

[0070] Optionally, the permanent magnet 25 includes a plurality of permanent magnet sheets, which are arranged circumferentially along the rotor core 24. The number of permanent magnet sheets can be even, and the magnetization directions of two adjacent permanent magnet sheets are opposite.

[0071] One axial side of the outer rotor housing 21 is open to form an opening 26, and the other axial side of the outer rotor housing 21 is closed.

[0072] For example, a through hole for passing through the rotating shaft 23 is formed on the side of the outer rotor housing 21 away from the opening 26. A bushing is installed in the through hole. The bushing is a metal part, which is fixed relative to the outer rotor housing 21. The bushing has a shaft hole for cooperating with the rotating shaft 23, and the bushing is fixed relative to the rotating shaft 23. The bushing and the rotating shaft 23 seal the shaft hole to prevent water from entering the interior of the outer rotor motor 101 through the shaft hole.

[0073] Optionally, the outer rotor motor 101 may further include a locking nut, which is threadedly connected to the rotating shaft 23. The locking nut is located outside the outer rotor housing 21, and the locking nut abuts against the bushing and the outer rotor housing 21 axially. By providing the locking nut and making the locking nut located outside the outer rotor housing 21 and the locking nut abut against the bushing and the outer rotor housing 21 axially, the locking nut can limit the position of the bushing, prevent the bushing from moving circumferentially away from the rolling bearing 34 and causing the bushing to fall off, and ensure that the position of the bushing can be fixed. The locking nut and the rotating shaft 23 jointly cover the shaft hole to prevent water from entering the interior of the outer rotor motor 101 through the shaft hole.

[0074] The stator assembly 30 is located inside the outer rotor housing 21, and the stator assembly 30 is sleeved on the outer peripheral side of the rotating shaft 23. The outer rotor 22 is sleeved on the outer peripheral side of the stator assembly 30.

[0075] For example, the stator assembly 30 includes a stator 36 and a plastic encapsulation 37, and the stator 36 and the plastic encapsulation 37 are injection-molded into one body. By injection-molding the stator 36 and the plastic encapsulation 37 into one body, the connection between the stator 36 and the plastic encapsulation 37 can be made more firm; and, a connection structure can be formed on the plastic encapsulation 37, avoiding punching or setting a connection structure on the stator 36 to affect the performance of the stator 36. By connecting the plastic encapsulation 37 with other components, the stator assembly 30 can be limited in position to achieve the effect of fixing the stator assembly 30.

[0076] Optionally, the plastic encapsulation 37 can completely wrap the stator 36, and the stator 36 is accommodated in the plastic encapsulation 37. By making the plastic encapsulation 37 completely wrap the stator 36, the stator 36 can be protected by the plastic encapsulation 37, avoiding the stator 36 being worn or corroded and affecting its performance.

[0077] Optionally, the encapsulation member 37 includes an outer end encapsulation portion 32, and the outer end encapsulation portion 32 is located on one side of the stator 36 facing the open end 26 of the outer rotor housing 21. A bearing chamber 33 is defined inside the stator assembly 30. The rotating shaft 23 passes through the bearing chamber 33. The bearing 34 is provided in the bearing chamber 33 and the bearing 34 is sleeved on the outer peripheral side of the rotating shaft 23. The outer rotor motor 101 may further include a sealing cover 38. The sealing cover 38 may be circular. The sealing cover 38 is covered on the side of the bearing chamber 33 facing the open end 26. The outer end encapsulation portion 32 may be annular. The outer end encapsulation portion 32 is disposed around the outer peripheral side of the sealing cover 38. The sealing cover 38 and the outer end encapsulation portion 32 jointly cover the open end 26 to prevent external dust or water from entering the inside of the outer rotor motor 101 from the open end 26.

[0078] Wherein, one end of the outer rotor assembly 20 adjacent to the open end 26 of the outer rotor housing 21 is a first mating end 27, and one end of the stator assembly 30 adjacent to the open end 26 of the outer rotor housing 21 is a second mating end 31. A sealing structure 40 is provided between the first mating end 27 and the second mating end 31. By providing the sealing structure 40 between the first mating end 27 and the second mating end 31, the sealing structure 40 closes the gap between the first mating end 27 and the second mating end 31, which can effectively prevent water and dust from entering the inside of the motor through the joint of the stator assembly 30 and the outer rotor assembly 20, playing a role of waterproofing and dustproofing.

[0079] According to the outer rotor motor 101 of the embodiment of the present invention, by providing a first mating end 27 at one end of the outer rotor assembly 20 adjacent to the open end 26 of the outer rotor housing 21, and a second mating end 31 at one end of the stator assembly 30 adjacent to the open end 26 of the outer rotor housing 21, and having a sealing structure 40 between the first mating end 27 and the second mating end 31, the sealing structure 40 closes the gap between the stator assembly 30 and the outer rotor housing 21, which can effectively prevent water and dust from entering the inside of the motor through the joint of the stator assembly 30 and the outer rotor assembly 20, playing a role of waterproofing and dustproofing.

[0080] According to some embodiments of the present invention, referring to Figure 3 , the sealing structure 40 includes a first sealing structure 41 and a second sealing structure 42. The first sealing structure 41 is provided at the first mating end 27 and the first sealing structure 41 is provided on the outer rotor housing 21. The second sealing structure 42 is provided at the second mating end 31 and the second sealing structure 42 is provided on the outer peripheral side of the stator assembly 30. The second sealing structure 42 is in an annular shape extending along the circumferential direction of the stator assembly 30, and the first sealing structure 41 is in an annular shape extending along the circumferential direction of the stator assembly 30. By setting both the second sealing structure 42 and the first sealing structure 41 to be in an annular shape extending along the circumferential direction of the stator assembly 30, the circumferential annular interval of the stator assembly 30 can be sealed, making the waterproof function of the sealing structure 40 more sufficient.

[0081] The second sealing structure 42 is in sealing cooperation with the first sealing structure 41. By making the second sealing structure 42 in sealing cooperation with the first sealing structure 41, a better seal can be achieved at the joint between the outer rotor assembly 20 and the stator assembly 30, preventing water, dust, etc. from entering the outer rotor motor 101 at the joint between the outer rotor assembly 20 and the stator assembly 30, so that the outer rotor motor 101 has a better waterproof and dustproof effect.

[0082] According to some embodiments of the present utility model, referring to Figure 3 and Figure 4 , the second sealing structure 42 includes an annular extension plate 43, and the extension plate 43 is connected to the outer peripheral side of the stator assembly 30 and the extension plate 43 is disposed around the stator assembly 30. A mating groove 44 is formed on the inner peripheral wall of the outer rotor housing 21, and the mating groove 44 is an annular shape extending along the circumferential direction of the outer rotor housing 21. Further, at least a part of the extension plate 43 is received in the mating groove 44. By providing the extension plate 43 in the second sealing structure 42 and providing the mating groove 44 on the inner peripheral wall of the outer rotor housing 21, water can be blocked by the extension plate 43 or the side wall of the mating groove 44 to prevent water from entering the interior of the outer rotor motor 101, making the sealing effect of the sealing structure 40 better. By making at least a part of the extension plate 43 received in the mating groove 44, it is difficult for water to enter the interior of the outer rotor motor 101 through the gap between the extension plate 43 and the mating groove 44, making the sealing effect of the sealing structure 40 better.

[0083] According to some embodiments of the present utility model, referring to Figure 3 , the stator assembly 30 includes a stator 36 and a plastic sealing member 37, and the stator 36 and the plastic sealing member 37 are injection-molded into one body. By injection-molding the stator 36 and the plastic sealing member 37 into one body, the connection between the stator 36 and the plastic sealing member 37 can be made more firm; and, a connection structure can be formed on the plastic sealing member 37, avoiding punching holes or providing connection structures on the stator 36 that may affect the performance of the stator 36. By connecting the plastic sealing member 37 to other components, the stator assembly 30 can be limited in position, achieving the effect of fixing the stator assembly 30.

[0084] The plastic sealing member 37 includes an outer end plastic sealing portion 32, and the outer end plastic sealing portion 32 is located on the side of the stator 36 facing the open end 26 of the outer rotor housing 21. By making the outer end plastic sealing portion 32 located on the side of the stator 36 facing the open end 26 of the outer rotor housing 21, at least a part of the plastic sealing member 37 of the stator 36 can be used as at least a part of the end cover of the outer rotor fan 100, realizing the sealing of the open end 26 of the hub 11 and preventing external dust and water from entering the interior of the outer rotor fan 100 through the open end 26.

[0085] The extension plate 43 is connected to the outer peripheral wall of the outer plastic-sealed part 32 and integrally injection-molded with the plastic-sealed part 37. By connecting the extension plate 43 to the outer peripheral wall of the outer plastic-sealed part 32 and integrally injection-molding with the plastic-sealed part 37, the extension plate 43 can seal the open part 26 of the outer peripheral wall of the outer plastic-sealed part 32, resulting in a better sealing effect. By integrally injection-molding the extension plate 43 with the plastic-sealed part 37, the connection between the extension plate 43 and the plastic-sealed part 37 can be more sufficient.

[0086] According to some embodiments of the present invention, referring to Figure 4 , along the radial direction of the outer rotor housing 21, the inner peripheral wall of the fitting groove 44 has a stepped structure. By making the inner peripheral wall of the fitting groove 44 have a stepped structure, the sealing path defined between the fitting groove 44 and the extension plate 43 can extend tortuously, making the sealing effect of the sealing structure 40 better.

[0087] According to some embodiments of the present invention, referring to Figure 4 , the first sealing structure 41 includes a protective plate 45. The protective plate 45 is provided on the outer rotor housing 21 and is annular extending along the circumferential direction of the outer rotor housing 21. By making the protective plate 45 be provided on the outer rotor housing 21 and be annular extending along the circumferential direction of the outer rotor housing 21, the circumferential annular area of the outer rotor housing 21 can be sealed, making the waterproof function of the sealing structure 40 more sufficient.

[0088] Among them, the protective plate 45 includes a fixing portion 46 arranged in the radial direction and a protective portion 47. The fixing portion 46 is fixed to the axial end face of the outer rotor housing 21. In the axial direction of the stator assembly 30, the protective portion 47 is located outside the extension plate 43. By fixing the fixing portion 46 of the protective plate 45 to the axial end face of the outer rotor housing 21, it is convenient to install and fix the protective plate 45 to the outer rotor housing 21. By making the protective portion 47 be located outside the extension plate 43 in the axial direction of the stator assembly 30, the area between the outside of the extension plate 43 and the inside of the outer rotor housing 21 can be sealed by the protective portion 47, preventing water from entering the interior of the outer rotor motor 101 from the area between the outside of the extension plate 43 and the inside of the outer rotor housing 21.

[0089] According to some embodiments of the present invention, referring to Figure 4 , a fitting notch 48 extending along the circumferential direction of the extension plate 43 is formed on the extension plate 43, and the protective portion 47 is received in the fitting notch 48. By providing a fitting notch 48 extending along the circumferential direction of the extension plate 43 on the extension plate 43 and making the protective portion 47 be received in the fitting notch 48, interference between the extension plate 43 and the protective portion 47 can be avoided; and the sealing path at the joint of the extension plate 43 and the protective plate 45 can be extended and the sealing path is relatively tortuous, resulting in a better sealing effect.

[0090] According to some embodiments of the present utility model, referring to Figure 4 , the gap between the protective part 47 and the inner wall of the mating notch 48 is a, and the value of a ranges from 0 mm to 3 mm. For example, the value of a can be 0 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc. By making a not greater than 3 mm, the gap between the protective part 47 and the inner wall of the mating notch 48 is small, and water is difficult to enter and flow into the outer rotor motor 101 from the gap between the protective part 47 and the inner wall of the mating notch 48, so that the sealing effect is better.

[0091] According to some embodiments of the present utility model, the fixing part 46 is provided with a positioning hole, and the outer rotor housing 21 is provided with a positioning protrusion, and the positioning protrusion is inserted into the positioning hole. By providing a positioning hole on the fixing part 46 and a positioning protrusion on the outer rotor housing 21, and inserting the positioning protrusion into the positioning hole, it is convenient to install and fix the protective plate 45 to the outer rotor housing 21.

[0092] Optionally, there may be multiple positioning holes, and the multiple positioning holes are arranged at intervals along the circumferential direction of the fixing part 46. Correspondingly, there are also multiple positioning protrusions, and the multiple positioning protrusions are arranged at intervals along the circumferential direction of the outer rotor housing 21, and the multiple positioning protrusions are respectively inserted into the positioning holes. By providing multiple positioning protrusions and positioning holes, and making the multiple positioning protrusions respectively inserted into the positioning holes, the protective plate 45 can be more reliably installed on the outer rotor housing 21.

[0093] According to some embodiments of the present utility model, referring to Figure 4 , a sealing protrusion 51 is provided on the inner side in the axial direction of the extension plate 43. The part of the inner wall of the mating groove 44 that is opposite to the extension plate 43 in the axial direction is the groove bottom wall 52, and a sealing groove 54 that cooperates with the sealing protrusion 51 is provided on the groove bottom wall 52. Both the sealing protrusion 51 and the sealing groove 54 are annular and extend along the circumferential direction of the extension plate 43. By providing a sealing protrusion 51 on the inner side in the axial direction of the extension plate 43 and a sealing groove 54 that cooperates with the sealing protrusion 51 on the groove bottom wall 52, water can be blocked by the side wall of the sealing protrusion 51 or the sealing groove 54 to prevent water from entering the outer rotor motor 101, so that the sealing effect of the sealing structure 40 is better. By making both the sealing protrusion 51 and the sealing groove 54 annular and extending along the circumferential direction of the extension plate 43, the annular area along the circumferential direction of the extension plate 43 can be sealed by the sealing protrusion 51 and the sealing groove 54.

[0094] According to some embodiments of the present utility model, referring to Figure 5 and Figure 6, a plurality of first sealing protrusions 55 arranged at intervals in the radial direction are provided on the inner side in the axial direction of the extension plate 43. The part of the inner wall of the mating groove 44 opposite to the extension plate 43 in the axial direction is the groove bottom wall 52, and a plurality of second sealing protrusions 56 arranged at intervals in the radial direction are provided on the groove bottom wall 52. The first sealing protrusions 55 and the second sealing protrusions 56 are arranged alternately in the radial direction. By providing a plurality of alternately arranged first sealing protrusions 55 and second sealing protrusions 56, a labyrinth seal is formed, further improving the sealing effect. The sealing effect of the sealing structure 40 can be made better.

[0095] According to some embodiments of the present invention, referring to Figure 6 , the gap between the first sealing protrusion 55 and the second sealing protrusion 56 is b, and the value range of b is 0 mm to 3 mm. For example, the value of b can be 0 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc. By making b not greater than 3 mm, the gap between the first sealing protrusion 55 and the second sealing protrusion 56 can be made smaller, and it is difficult for water to enter and flow into the inner part of the outer rotor motor 101 from the gap between the first sealing protrusion 55 and the second sealing protrusion 56, making the sealing effect of the sealing structure 40 better.

[0096] According to some embodiments of the present invention, referring to Figure 6 , the outer peripheral surface of the extension plate 43 is the first surface 57, and the first surface 57 extends obliquely away from the central axis direction of the stator assembly 30 in the direction from the groove bottom wall 52 to the open end 26. In practical applications, the outer rotor motor 101 is generally installed horizontally. By making the first surface 57 extend obliquely towards the central axis direction of the stator assembly 30 in the direction from the groove bottom wall 52 to the open end 26, when water falls on the first surface 57, under the guiding action of the first surface 57, it can slide out to the outside of the outer rotor motor 101 along the first surface 57, making it difficult for water to flow into the inner part of the outer rotor motor 101 from the outside along the first surface 57, and the sealing effect of the extension plate 43 can be made better; and when the outer rotor motor 101 is running, the rotating action can also throw the water away from the outer rotor motor 101, further ensuring the waterproof performance of the outer rotor motor 101.

[0097] According to some embodiments of the present invention, referring to Figures 7 - 15, a seal 70 is provided at the radially outer end of the extension plate 43. The seal 70 is an annular shape extending along the circumferential direction of the extension plate 43. The seal 70 is located in the mating groove 44 and is used to seal the gap between the radially outer end of the extension plate 43 and the inner wall of the mating groove 44. By arranging the seal 70 at the radially outer end of the extension plate 43 and making it an annular shape extending along the circumferential direction of the extension plate 43, the circumferential annular area of the extension plate 43 can be sealed, making the waterproof function of the sealing structure 40 more sufficient. By arranging the seal 70 in the mating groove 44 and enabling the seal 70 to seal the gap between the radially outer end of the extension plate 43 and the inner wall of the mating groove 44, it is difficult for water to enter the interior of the outer rotor motor 101 through the gap between the radially outer end of the extension plate 43 and the inner wall of the mating groove 44, making the sealing effect of the sealing structure 40 better.

[0098] Optionally, the seal 70 can be a rubber part or a silica gel part.

[0099] According to some embodiments of the present invention, referring to Figure 7 , an installation groove 71 is formed on the seal 70, and the radially outer end of the extension plate 43 is received in the installation groove 71. By providing the installation groove 71 on the seal 70 and making the radially outer end of the extension plate 43 received in the installation groove 71, the connection between the seal 70 and the extension plate 43 can be made more firm, avoiding the seal 70 falling off and resulting in a reduction in the waterproof performance due to seal failure.

[0100] According to some embodiments of the present invention, referring to Figures 7 - 9 , the seal 70 includes a seal ring body 72 and a seal lip 73. The seal ring body 72 is fixed to the radially outer end of the extension plate 43, and the seal lip 73 is connected to the seal ring body 72. The seal lip 73 is one, or the seal lip 73 is a plurality arranged along the axial direction of the seal ring body 72. At least one seal lip 73 includes a first seal lip 79, and the first seal lip 79 abuts against the outer rotor housing 21. By arranging the seal 70 to include the seal ring body 72 and at least one seal lip 73 provided on the seal ring body 72, and making the seal lip 73 one or a plurality arranged along the axial direction of the seal ring body 72, the sealing effect of the seal 70 can be made more sufficient. By making at least one seal lip 73 include the first seal lip 79 and the first seal lip 79 abut against the outer rotor housing 21, the gap between the outer rotor housing 21 and the extension plate 43 can be sealed by the seal lip 73, avoiding water from entering the interior of the outer rotor motor 101 through the gap between the outer rotor housing 21 and the extension plate 43, making the sealing effect of the seal 70 better.

[0101] According to some embodiments of the present utility model, the compression amount of the first sealing lip 79 is c, and the value range of c is 0 mm to 2 mm. For example, the value of c can be 0 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, etc. By making the compression amount of the first sealing lip 79 not greater than 2 mm, the first sealing lip 79 can smoothly abut and cooperate with the outer rotor housing 21, avoiding difficulties in installing the first sealing lip 79.

[0102] The compression amount of the first sealing lip 79 refers to: when the seal 70 is installed on the extension plate 43 and abuts against the outer rotor housing 21, the first sealing lip 79 is compressed and deformed, and at this time, the compression deformation amount of the first sealing lip 79 is the compression amount of the first sealing lip 79.

[0103] According to some embodiments of the present utility model, referring to Figure 9 , a moving notch 74 for the movement of the first sealing lip 79 is formed on the outer peripheral surface of the seal ring body 72. Since the seal ring body 72 is fixed on the stator 36, the seal ring body 72 is fixed relative to the stator 36, while the outer rotor housing 21 rotates relative to the stator 36. Therefore, the outer rotor housing 21 rotates relative to the seal ring body 72. By providing a moving notch 74 for the movement of the first sealing lip 79 on the outer peripheral surface of the seal ring body 72, the first sealing lip 79 can move, reducing the wear of the first sealing lip and increasing the sealing performance of the first sealing lip 79.

[0104] According to some embodiments of the present utility model, referring to Figure 8 , the outer peripheral surface of the seal ring body 72 is the second surface 75, and a first gap 76 is defined between the second surface 75 and the groove side wall 53. The width of the first gap 76 is small. By defining a first gap 76 between the second surface 75 and the groove side wall 53, it is difficult for water to enter the interior of the outer rotor motor 101 through the first gap 76, making the sealing effect of the sealing structure 40 better; and, the outer rotor housing 21 can rotate freely relative to the seal 70 fixed on the stator assembly 30.

[0105] According to some embodiments of the present utility model, referring to Figure 8, the part of the inner wall of the mating groove 44 that is opposite to the extension plate 43 in the axial direction is the groove bottom wall 52, and the part of the inner wall of the mating groove 44 that is opposite to the extension plate 43 in the radial direction is the groove side wall 53. A sealing boss 58 is provided at the connection between the groove bottom wall 52 and the groove side wall 53, and the first sealing lip 79 abuts against the sealing boss 58. By providing the sealing boss 58 at the connection between the groove bottom wall 52 and the groove side wall 53, the distance between the sealing boss 58 and the first sealing lip 79 can be smaller, which is convenient for the abutting and cooperation between the sealing boss 58 and the first sealing lip 79, making the sealing effect of the first sealing lip 79 better; moreover, by providing the sealing boss 58 at the connection between the groove bottom wall 52 and the groove side wall 53, a step can be formed at the connection between the groove side wall 53 and the groove bottom wall 52, and there are more turns between the groove side wall 53, the side wall of the sealing boss 58 and the groove bottom wall 52, so that water is difficult to flow into the outer rotor motor 101 along the groove side wall 53, the side wall of the sealing boss 58 and the groove bottom wall 52, making the sealing effect of the sealing structure 40 better.

[0106] According to some embodiments of the present invention, referring to Figure 8 , the sealing boss 58 has a first step surface 59 and a second step surface 60 arranged at an angle. The first step surface 59 is connected between the groove side wall 53 and the second step surface 60, and the first sealing lip 79 abuts against the first step surface 59. For example, the first step surface 59 can be perpendicular to the axial direction of the outer rotor housing 21, and the second step surface 60 can be perpendicular to the first step surface 59. By making the sealing boss 58 have the first step surface 59 and the second step surface 60 arranged at an angle, there can be more turns between the groove side wall 53, the first step surface 59, the second step surface 60 and the groove bottom wall 52, so that water is difficult to flow into the outer rotor motor 101 along the groove side wall 53, the first step surface 59, the second step surface 60 and the groove bottom wall 52, making the sealing effect of the sealing structure 40 better. By making the first sealing lip 79 abut against the first step surface 59, the first sealing lip 79 can seal at a position closer to the open end 26, better blocking the water flow to the second step surface 60.

[0107] According to some embodiments of the present invention, referring to Figure 8 , there is an angle α between the protruding direction of the first sealing lip 79 relative to the seal ring body 72 and the first step surface 59. By making there be an angle between the protruding direction of the first sealing lip 79 relative to the seal ring body 72 and the first step surface 59, the first sealing lip 79 can be pressed against the first step surface 59, making the fit between the first sealing lip 79 and the first step surface 59 closer, and making the sealing effect of the seal 70 better.

[0108] According to some embodiments of the present invention, referring to Figure 8, the first sealing lip 79 extends obliquely in a radially outward direction toward the bottom wall 52 of the groove. By making the first sealing lip 79 extend obliquely in a radially outward direction toward the bottom wall 52 of the groove, the first sealing lip 79 can be made to abut against the first stepped surface 59, making the fit between the first sealing lip 79 and the first stepped surface 59 closer and resulting in a better sealing effect of the seal 70.

[0109] According to some embodiments of the present invention, referring to Figure 14 and Figure 15 , there are multiple sealing lips 73. By having multiple sealing lips 73, the sealing effect of the seal 70 can be better. The multiple sealing lips 73 further include a second sealing lip 80, and the second sealing lip 80 is disposed opposite to the second stepped surface 60. By making the second sealing lip 80 disposed opposite to the second stepped surface 60, it is difficult for water to enter the outer rotor motor 101 through the gap between the second sealing lip 80 and the second stepped surface 60. At least a part of the sealing boss 58 is received in the sealing space defined between the second sealing lip 80 and the first sealing lip 79, so that a labyrinth seal can be formed, making the sealing effect of the sealing structure 40 better.

[0110] According to some embodiments of the present invention, referring to Figure 14 , a second gap 77 is defined between the second sealing lip 80 and the second stepped surface 60. The width of the second gap 77 is small. By defining the second gap 77 between the second sealing lip 80 and the second stepped surface 60, it is difficult for water to enter the interior of the outer rotor motor 101 through the second gap 77, making the sealing effect of the sealing structure 40 better; and, the outer rotor housing 21 can rotate freely relative to the seal 70.

[0111] According to some embodiments of the present invention, referring to Figure 10 and Figure 11 , there are multiple sealing lips 73. The multiple sealing lips 73 further include a second sealing lip 81, and the second sealing lip 81 is located axially outside the first sealing lip 79. By having multiple sealing lips 73 and the second sealing lip 81 located axially outside the first sealing lip 79, in the axial direction of the outer rotor motor 101, through the layered sealing action of the multiple sealing lips 73, the sealing effect of the seal 70 is further improved.

[0112] According to some embodiments of the present invention, referring to Figure 10 and Figure 11, a third gap 78 is defined between the second sealing lip 81 and the side wall 53 of the groove. The width of the third gap 78 is small. By defining the third gap 78 between the second sealing lip 81 and the side wall 53 of the groove, it can be made difficult for water to enter the interior of the outer rotor motor 101 through the third gap 78, making the sealing effect of the sealing structure 40 better; and, the outer rotor housing 21 can be freely rotated relative to the seal 70.

[0113] According to some embodiments of the present invention, referring to Figure 11 , the second sealing lip 81 extends obliquely in a direction away from the first sealing lip 79 in the radially outward direction. By making the second sealing lip 81 extend obliquely in a direction away from the first sealing lip 79 in the radially outward direction, sufficient space can be provided between the second sealing lip 81 and the first sealing lip 79, and the first sealing lip 79 can swing and move in the space between the second sealing lip 81 and the first sealing lip 79, reducing the wear of the first sealing lip 79.

[0114] According to some embodiments of the present invention, referring to Figure 12 , an activity space 82 for the activity of the first sealing lip 79 is defined between the second sealing lip 81 and the first sealing lip 79. By defining the activity space 82 for the activity of the first sealing lip 79 between the second sealing lip 81 and the first sealing lip 79, the first sealing lip 79 can swing and move, reducing the wear of the first sealing lip 79.

[0115] According to some embodiments of the present invention, referring to Figure 3 , a bearing chamber 33 is defined on the inner peripheral side of the stator assembly 30. The rotating shaft 23 is disposed through the bearing chamber 33. The outer rotor motor 101 includes a bearing 34. The bearing 34 is disposed in the bearing chamber 33 and sleeved on the outer peripheral side of the rotating shaft 23. A sealing cover 38 is provided on one side of the bearing chamber 33 close to the open end 26. The sealing cover 38 is fixed to the stator assembly 30. By providing the sealing cover 38 on one side of the bearing chamber 33 close to the open end 26 and fixing the sealing cover 38 to the stator assembly 30, the sealing cover 38 can seal the bearing chamber 33, preventing external dust or water from entering the bearing chamber 33.

[0116] The outer rotor fan 100 according to the second aspect embodiment of the present invention includes: a wind wheel 10 and an outer rotor motor 101. The wind wheel 10 includes a hub 11 and a plurality of blades 12 provided on the outer peripheral wall of the hub 11. The plurality of blades 12 are arranged at intervals along the circumferential direction of the hub 11, and the outer rotor 22 is connected to the hub 11.

[0117] The external rotor fan 100 according to an embodiment of the present utility model includes an external rotor motor 101 according to an embodiment of the first aspect of the present utility model. The motor can effectively prevent water and dust from entering the interior of the motor through the joint between the stator assembly 30 and the external rotor assembly 20, playing a role in waterproofing and dustproofing.

[0118] According to some embodiments of the present utility model, referring to Figure 3 , a concave cavity is formed in the hub 11. Both the external rotor assembly 20 and the stator assembly 30 are located in the concave cavity, and at least part of the hub 11 constitutes the external rotor housing 21. By providing a concave cavity in the hub 11 and making both the external rotor assembly 20 and the stator assembly 30 located in the concave cavity, the external rotor assembly 20 and the stator assembly 30 can make full use of the space of the concave cavity, reduce the axial length of the external rotor fan 100, and improve the space utilization rate.

[0119] An air conditioner according to an embodiment of the third aspect of the present utility model includes: an external rotor fan 100 according to an embodiment of the second aspect of the present utility model.

[0120] The air conditioner according to an embodiment of the present utility model includes an external rotor fan 100 according to an embodiment of the second aspect of the present utility model. The external rotor fan 100 includes an external rotor motor 101 according to an embodiment of the first aspect of the present utility model. The motor can effectively prevent water and dust from entering the interior of the motor through the joint between the stator assembly 30 and the external rotor assembly 20, playing a role in waterproofing and dustproofing.

[0121] Next, referring to Figures 1 - 15 describe the external rotor motor 101 and the external rotor fan 100 according to some embodiments of the present utility model.

[0122] Embodiment 1,

[0123] Referring to Figures 1 - 4 , in this embodiment, the external rotor fan 100 includes a wind wheel 10 and an external rotor motor 101. The wind wheel 10 includes a hub 11 and a plurality of blades 12 provided on the outer peripheral wall of the hub 11. The external rotor 22 is connected to the hub 11. A concave cavity is formed in the hub 11. Both the external rotor assembly 20 and the stator assembly 30 are located in the concave cavity, and at least part of the hub 11 constitutes the external rotor housing 21.

[0124] The external rotor motor 101 includes an external rotor assembly 20, a stator assembly 30, and a sealing structure 40. The external rotor assembly 20 includes an external rotor housing 21, an external rotor 22, and a rotating shaft 23. The external rotor 22 includes a rotor core 24 and a permanent magnet 25. The external rotor 22 is located inside the external rotor housing 21 and fixed to the external rotor housing 21. The rotating shaft 23 is connected to the external rotor housing 21. One axial side of the external rotor housing 21 is open to form an open port 26, and the other axial side of the external rotor housing 21 is closed.

[0125] The stator assembly 30 is located inside the outer rotor housing 21 and sleeved on the outer peripheral side of the rotating shaft 23, and the outer rotor 22 is sleeved on the outer peripheral side of the stator assembly 30. The stator assembly 30 includes a stator 36 and a plastic encapsulation 37, and the stator 36 and the plastic encapsulation 37 are injection molded into one body. The plastic encapsulation 37 includes an outer end plastic encapsulation part 32, and the outer end plastic encapsulation part 32 is located on one side of the stator 36 facing the open end 26 of the outer rotor housing 21.

[0126] Among them, one end of the outer rotor assembly 20 adjacent to the open end 26 of the outer rotor housing 21 is the first mating end 27, and one end of the stator assembly 30 adjacent to the open end 26 of the outer rotor housing 21 is the second mating end 31. There is a sealing structure 40 between the first mating end 27 and the second mating end 31. The sealing structure 40 includes a first sealing structure 41 and a second sealing structure 42. The first sealing structure 41 is provided on the first mating end 27 and on the outer rotor housing 21. The second sealing structure 42 is provided on the second mating end 31 and on the outer peripheral side of the stator assembly 30. Both the second sealing structure 42 and the first sealing structure 41 are annular extending along the circumferential direction of the stator assembly 30, and the second sealing structure 42 is in sealing cooperation with the first sealing structure 41.

[0127] The second sealing structure 42 includes an annular extension plate 43. The extension plate 43 is connected to the outer peripheral side of the stator assembly 30 and is arranged around the stator assembly 30. The extension plate 43 is connected to the outer peripheral wall of the outer end plastic encapsulation part 32 and is integrally injection molded with the plastic encapsulation 37. The outer peripheral surface of the extension plate 43 is the first surface 57, and the first surface 57 extends obliquely away from the central axis direction of the stator assembly 30 in the direction from the groove bottom wall 52 to the open end 26.

[0128] A mating groove 44 is formed on the inner peripheral wall of the outer rotor housing 21. The mating groove 44 is annular extending along the circumferential direction of the outer rotor housing 21. At least a part of the extension plate 43 is received in the mating groove 44. Along the radial direction of the outer rotor housing 21, the inner peripheral wall of the mating groove 44 has a stepped structure.

[0129] The first sealing structure 41 includes a protection plate 45. The protection plate 45 is provided on the outer rotor housing 21 and is annular extending along the circumferential direction of the outer rotor housing 21. Among them, the protection plate 45 includes a fixing part 46 and a protection part 47 arranged along the radial direction. The fixing part 46 is fixed to the axial end face of the outer rotor housing 21. The fixing part 46 is provided with a positioning hole, and the outer rotor housing 21 is provided with a positioning protrusion. The positioning protrusion is inserted into the positioning hole. In the axial direction of the stator assembly 30, the protection part 47 is located outside the extension plate 43. A mating notch 48 extending along the circumferential direction of the extension plate 43 is formed on the extension plate 43, and the protection part 47 is received in the mating notch 48. The clearance range between the protection part 47 and the inner wall of the mating notch 48 is a, and the value of a is 0 mm to 3 mm.

[0130] A sealing bump 51 is provided on the inner side in the axial direction of the extension plate 43. The part of the inner wall of the mating groove 44 that is opposite to the extension plate 43 in the axial direction is the groove bottom wall 52, and a sealing groove 54 that mates with the sealing bump 51 is provided on the groove bottom wall 52. Both the sealing bump 51 and the sealing groove 54 are annular and extend along the circumferential direction of the extension plate 43.

[0131] Embodiment 2

[0132] Referring to Figures 5 - 6 , in this embodiment, the external rotor fan 100 includes a wind wheel 10 and an external rotor motor 101. The wind wheel 10 includes a hub 11 and a plurality of blades 12 provided on the outer peripheral wall of the hub 11, and the external rotor 22 is connected to the hub 11. A concave cavity is formed inside the hub 11, and both the external rotor assembly 20 and the stator assembly 30 are located inside the concave cavity, and at least part of the hub 11 constitutes the external rotor housing 21.

[0133] The external rotor motor 101 includes an external rotor assembly 20, a stator assembly 30, and a sealing structure 40. The external rotor assembly 20 includes an external rotor housing 21, an external rotor 22, and a rotating shaft 23. The external rotor 22 includes a rotor core 24 and a permanent magnet 25. The external rotor 22 is located inside the external rotor housing 21 and fixed to the external rotor housing 21, and the rotating shaft 23 is connected to the external rotor housing 21. One axial side of the external rotor housing 21 is open to form an open port 26, and the other axial side of the external rotor housing 21 is closed.

[0134] The stator assembly 30 is located inside the external rotor housing 21 and sleeved on the outer peripheral side of the rotating shaft 23, and the external rotor 22 is sleeved on the outer peripheral side of the stator assembly 30. The stator assembly 30 includes a stator 36 and a plastic sealing member 37, and the stator 36 and the plastic sealing member 37 are injection-molded into one body. The plastic sealing member 37 includes an outer end plastic sealing portion 32, and the outer end plastic sealing portion 32 is located on one side of the stator 36 facing the open port 26 of the external rotor housing 21.

[0135] Among them, one end of the external rotor assembly 20 adjacent to the open port 26 of the external rotor housing 21 is the first mating end 27, and one end of the stator assembly 30 adjacent to the open port 26 of the external rotor housing 21 is the second mating end 31. A sealing structure 40 is provided between the first mating end 27 and the second mating end 31. The sealing structure 40 includes a first sealing structure 41 and a second sealing structure 42. The first sealing structure 41 is provided on the first mating end 27 and on the external rotor housing 21, and the second sealing structure 42 is provided on the second mating end 31 and on the outer peripheral side of the stator assembly 30. Both the second sealing structure 42 and the first sealing structure 41 are annular and extend along the circumferential direction of the stator assembly 30, and the second sealing structure 42 is in sealing cooperation with the first sealing structure 41.

[0136] A mating groove 44 is formed on the inner peripheral wall of the outer rotor housing 21. The part of the inner wall of the mating groove 44 that is axially opposite to the extension plate 43 is the groove bottom wall 52. A plurality of second sealing protrusions 56 arranged at radial intervals are provided on the groove bottom wall 52. The first sealing protrusions 55 and the second sealing protrusions 56 are arranged alternately in the radial direction. The gap range between the first sealing protrusions 55 and the second sealing protrusions 56 is b, and the value range of b is 0 mm to 3 mm.

[0137] A sealing protrusion 51 is provided on the axially inner side of the extension plate 43. The part of the inner wall of the mating groove 44 that is axially opposite to the extension plate 43 is the groove bottom wall 52. A sealing groove 54 that cooperates with the sealing protrusion 51 is provided on the groove bottom wall 52. Both the sealing protrusion 51 and the sealing groove 54 are annular and extend along the circumferential direction of the extension plate 43.

[0138] Embodiment Three

[0139] Referring to Figures 7 - 9 , in this embodiment, the outer rotor fan 100 includes a wind wheel 10 and an outer rotor motor 101. The wind wheel 10 includes a hub 11 and a plurality of blades 12 provided on the outer peripheral wall of the hub 11. The outer rotor 22 is connected to the hub 11. A concave cavity is formed inside the hub 11. The outer rotor assembly 20 and the stator assembly 30 are both located inside the concave cavity. At least part of the hub 11 constitutes the outer rotor housing 21.

[0140] The outer rotor motor 101 includes an outer rotor assembly 20, a stator assembly 30, and a sealing structure 40. The outer rotor assembly 20 includes an outer rotor housing 21, an outer rotor 22, and a rotating shaft 23. The outer rotor 22 includes a rotor core 24 and a permanent magnet 25. The outer rotor 22 is located inside the outer rotor housing 21 and fixed to the outer rotor housing 21. The rotating shaft 23 is connected to the outer rotor housing 21. One axial side of the outer rotor housing 21 is open to form an open opening 26, and the other axial side of the outer rotor housing 21 is closed.

[0141] The stator assembly 30 is located inside the outer rotor housing 21 and sleeved on the outer peripheral side of the rotating shaft 23. The outer rotor 22 is sleeved on the outer peripheral side of the stator assembly 30. The stator assembly 30 includes a stator 36 and a plastic encapsulation 37. The stator 36 and the plastic encapsulation 37 are injection-molded into one body. The plastic encapsulation 37 includes an outer end plastic encapsulation part 32, and the outer end plastic encapsulation part 32 is located on one side of the stator 36 facing the open opening 26 of the outer rotor housing 21.

[0142] Among them, one end of the outer rotor assembly 20 adjacent to the open end 26 of the outer rotor housing 21 is the first mating end 27, and one end of the stator assembly 30 adjacent to the open end 26 of the outer rotor housing 21 is the second mating end 31. A sealing structure 40 is provided between the first mating end 27 and the second mating end 31. The sealing structure 40 includes a first sealing structure 41 and a second sealing structure 42. The first sealing structure 41 is provided at the first mating end 27 and on the outer rotor housing 21. The second sealing structure 42 is provided at the second mating end 31 and on the outer peripheral side of the stator assembly 30. Both the second sealing structure 42 and the first sealing structure 41 are annular and extend circumferentially along the stator assembly 30. The second sealing structure 42 is in sealing cooperation with the first sealing structure 41.

[0143] The second sealing structure 42 includes an annular extension plate 43. The extension plate 43 is connected to the outer peripheral side of the stator assembly 30 and is arranged around the stator assembly 30. The extension plate 43 is connected to the outer peripheral wall of the outer end plastic encapsulation part 32 and is integrally injection molded with the plastic encapsulation member 37.

[0144] A sealing member 70 is provided at the radially outer end of the extension plate 43. The sealing member 70 is annular and extends circumferentially along the extension plate 43. The sealing member 70 is located in the mating groove 44 and is used to seal the gap between the radially outer end of the extension plate 43 and the inner wall of the mating groove 44. An installation groove 71 is formed on the sealing member 70. The radially outer end of the extension plate 43 is received in the installation groove 71. The sealing member 70 includes a sealing ring body 72 and a sealing lip 73. The sealing ring body 72 is fixed to the radially outer end of the extension plate 43. The sealing lip 73 is connected to the sealing ring body 72. The sealing lip 73 is one or a plurality arranged axially along the sealing ring body 72. At least one sealing lip 73 includes a first sealing lip 79. The first sealing lip 79 abuts against the outer rotor housing 21. The compression amount of the first sealing lip 79 is c, and the value range of c is 0 mm to 2 mm. An activity notch 74 for the movement of the first sealing lip 79 is formed on the outer peripheral surface of the sealing ring body 72. The outer peripheral surface of the sealing ring body 72 is the second surface 75. A first gap 76 is defined between the second surface 75 and the groove side wall 53.

[0145] A mating groove 44 is formed on the inner peripheral wall of the outer rotor housing 21. The mating groove 44 is an annular shape extending along the circumferential direction of the outer rotor housing 21. At least a part of the extension plate 43 is received in the mating groove 44. Along the radial direction of the outer rotor housing 21, the inner peripheral wall of the mating groove 44 has a stepped structure. The part of the inner wall of the mating groove 44 opposite to the extension plate 43 in the axial direction is the groove bottom wall 52, and the part of the inner wall of the mating groove 44 opposite to the extension plate 43 in the radial direction is the groove side wall 53. A sealing boss 58 is provided at the connection between the groove bottom wall 52 and the groove side wall 53, and the first sealing lip 79 abuts against the sealing boss 58. The sealing boss 58 has a first stepped surface 59 and a second stepped surface 60 arranged at an angle. The first stepped surface 59 is connected between the groove side wall 53 and the second stepped surface 60, and the first sealing lip 79 abuts against the first stepped surface 59. The sealing boss 58 has a first stepped surface 59 and a second stepped surface 60 arranged at an angle. The first stepped surface 59 is connected between the groove side wall 53 and the second stepped surface 60, and the first sealing lip 79 abuts against the first stepped surface 59. There is an angle between the protruding direction of the first sealing lip 79 relative to the sealing ring body 72 and the first stepped surface 59, and the first sealing lip 79 extends obliquely in the direction approaching the groove bottom wall 52 in the radially outward direction.

[0146] Embodiment Four

[0147] Referring to Figures 10 - 12 , in this embodiment, the external rotor fan 100 includes a wind wheel 10 and an external rotor motor 101. The wind wheel 10 includes a hub 11 and a plurality of blades 12 provided on the outer peripheral wall of the hub 11. The external rotor 22 is connected to the hub 11. A concave cavity is formed in the hub 11. The external rotor assembly 20 and the stator assembly 30 are both located in the concave cavity, and at least a part of the hub 11 constitutes the outer rotor housing 21.

[0148] The external rotor motor 101 includes an external rotor assembly 20, a stator assembly 30, and a sealing structure 40. The external rotor assembly 20 includes an outer rotor housing 21, an external rotor 22, and a rotating shaft 23. The external rotor 22 includes a rotor core 24 and a permanent magnet 25. The external rotor 22 is located inside the outer rotor housing 21 and fixed to the outer rotor housing 21. The rotating shaft 23 is connected to the outer rotor housing 21. One axial side of the outer rotor housing 21 is open to form an open port 26, and the other axial side of the outer rotor housing 21 is closed.

[0149] The stator assembly 30 is located inside the outer rotor housing 21 and sleeved on the outer peripheral side of the rotating shaft 23. The external rotor 22 is sleeved on the outer peripheral side of the stator assembly 30. The stator assembly 30 includes a stator 36 and a plastic sealing member 37. The stator 36 and the plastic sealing member 37 are injection molded into one body. The plastic sealing member 37 includes an outer end plastic sealing portion 32, and the outer end plastic sealing portion 32 is located on one side of the stator 36 facing the open port 26 of the outer rotor housing 21.

[0150] Among them, one end of the outer rotor assembly 20 adjacent to the open end 26 of the outer rotor housing 21 is the first mating end 27, and one end of the stator assembly 30 adjacent to the open end 26 of the outer rotor housing 21 is the second mating end 31. A sealing structure 40 is provided between the first mating end 27 and the second mating end 31. The sealing structure 40 includes a first sealing structure 41 and a second sealing structure 42. The first sealing structure 41 is provided at the first mating end 27 and on the outer rotor housing 21. The second sealing structure 42 is provided at the second mating end 31 and on the outer peripheral side of the stator assembly 30. Both the second sealing structure 42 and the first sealing structure 41 are annular and extend circumferentially along the stator assembly 30. The second sealing structure 42 is in sealing cooperation with the first sealing structure 41.

[0151] The second sealing structure 42 includes an annular extension plate 43. The extension plate 43 is connected to the outer peripheral side of the stator assembly 30 and is arranged around the stator assembly 30. The extension plate 43 is connected to the outer peripheral wall of the outer end plastic encapsulation part 32 and is integrally injection-molded with the plastic encapsulation member 37.

[0152] A sealing member 70 is provided at the radially outer end of the extension plate 43. The sealing member 70 is annular and extends circumferentially along the extension plate 43. The sealing member 70 is located in the mating groove 44 and is used to seal the gap between the radially outer end of the extension plate 43 and the inner wall of the mating groove 44. An installation groove 71 is formed on the sealing member 70. The radially outer end of the extension plate 43 is received in the installation groove 71. The sealing member 70 includes a sealing ring body 72 and a sealing lip 73. The sealing ring body 72 is fixed to the radially outer end of the extension plate 43. The sealing lip 73 is connected to the sealing ring body 72. The sealing lip 73 is one or a plurality arranged axially along the sealing ring body 72. At least one sealing lip 73 includes a first sealing lip 79. The first sealing lip 79 abuts against the outer rotor housing 21. The compression amount of the first sealing lip 79 is c, and the value range of c is 0 mm to 2 mm. An activity notch 74 for the movement of the first sealing lip 79 is formed on the outer peripheral surface of the sealing ring body 72. The outer peripheral surface of the sealing ring body 72 is the second surface 75. A first gap 76 is defined between the second surface 75 and the groove side wall 53.

[0153] A mating groove 44 is formed on the inner peripheral wall of the outer rotor housing 21. The mating groove 44 is an annular shape extending along the circumferential direction of the outer rotor housing 21. At least a part of the extension plate 43 is received in the mating groove 44. Along the radial direction of the outer rotor housing 21, the inner peripheral wall of the mating groove 44 has a stepped structure. The part of the inner wall of the mating groove 44 opposite to the extension plate 43 in the axial direction is the groove bottom wall 52, and the part of the inner wall of the mating groove 44 opposite to the extension plate 43 in the radial direction is the groove side wall 53. A sealing boss 58 is provided at the connection between the groove bottom wall 52 and the groove side wall 53, and the first sealing lip 79 abuts against the sealing boss 58. The sealing boss 58 has a first stepped surface 59 and a second stepped surface 60 arranged at an angle. The first stepped surface 59 is connected between the groove side wall 53 and the second stepped surface 60, and the first sealing lip 79 abuts against the first stepped surface 59. The sealing boss 58 has a first stepped surface 59 and a second stepped surface 60 arranged at an angle. The first stepped surface 59 is connected between the groove side wall 53 and the second stepped surface 60, and the first sealing lip 79 abuts against the first stepped surface 59. There is an angle between the protruding direction of the first sealing lip 79 relative to the sealing ring body 72 and the first stepped surface 59, and the first sealing lip 79 extends obliquely in the direction of approaching the groove bottom wall 52 in the radially outward direction.

[0154] There are multiple sealing lips 73, and the multiple sealing lips 73 further include a second sealing lip 81. The second sealing lip 81 is located on the axial outer side of the first sealing lip 79. A third gap 78 is defined between the second sealing lip 81 and the groove side wall 53. The second sealing lip 81 extends obliquely in the direction away from the first sealing lip 79 in the radially outward direction. A movement space 82 for the first sealing lip 79 to move is defined between the second sealing lip 81 and the first sealing lip 79.

[0155] Embodiment Five

[0156] Referring to Figures 13 - 15 , in this embodiment, the outer rotor fan 100 includes a wind wheel 10 and an outer rotor motor 101. The wind wheel 10 includes a hub 11 and a plurality of blades 12 provided on the outer peripheral wall of the hub 11. The outer rotor 22 is connected to the hub 11. A concave cavity is formed in the hub 11, and both the outer rotor assembly 20 and the stator assembly 30 are located in the concave cavity. At least a part of the hub 11 constitutes the outer rotor housing 21.

[0157] The outer rotor motor 101 includes an outer rotor assembly 20, a stator assembly 30, and a sealing structure 40. The outer rotor assembly 20 includes an outer rotor housing 21, an outer rotor 22, and a rotating shaft 23. The outer rotor 22 includes a rotor core 24 and a permanent magnet 25. The outer rotor 22 is located inside the outer rotor housing 21 and fixed to the outer rotor housing 21. The rotating shaft 23 is connected to the outer rotor housing 21. One axial side of the outer rotor housing 21 is open to form an open port 26, and the other axial side of the outer rotor housing 21 is closed.

[0158] The stator assembly 30 is located within the outer rotor housing 21 and sleeved on the outer peripheral side of the rotating shaft 23, and the outer rotor 22 is sleeved on the outer peripheral side of the stator assembly 30. The stator assembly 30 includes a stator 36 and a plastic encapsulation 37, and the stator 36 and the plastic encapsulation 37 are injection-molded into one body. The plastic encapsulation 37 includes an outer end plastic encapsulation portion 32, and the outer end plastic encapsulation portion 32 is located on one side of the stator 36 facing the open end 26 of the outer rotor housing 21.

[0159] Among them, one end of the outer rotor assembly 20 adjacent to the open end 26 of the outer rotor housing 21 is a first mating end 27, and one end of the stator assembly 30 adjacent to the open end 26 of the outer rotor housing 21 is a second mating end 31. A sealing structure 40 is provided between the first mating end 27 and the second mating end 31. The sealing structure 40 includes a first sealing structure 41 and a second sealing structure 42. The first sealing structure 41 is provided on the first mating end 27 and on the outer rotor housing 21. The second sealing structure 42 is provided on the second mating end 31 and on the outer peripheral side of the stator assembly 30. Both the second sealing structure 42 and the first sealing structure 41 are annular and extend along the circumferential direction of the stator assembly 30, and the second sealing structure 42 is in sealing cooperation with the first sealing structure 41.

[0160] The second sealing structure 42 includes an annular extension plate 43. The extension plate 43 is connected to the outer peripheral side of the stator assembly 30 and is disposed around the stator assembly 30. The extension plate 43 is connected to the outer peripheral wall of the outer end plastic encapsulation portion 32 and is integrally injection-molded with the plastic encapsulation 37.

[0161] A sealing member 70 is provided at the radially outer end of the extension plate 43. The sealing member 70 is annular and extends along the circumferential direction of the extension plate 43. The sealing member 70 is located within the mating groove 44 and is used to seal the gap between the radially outer end of the extension plate 43 and the inner wall of the mating groove 44. An installation groove 71 is formed on the sealing member 70, and the radially outer end of the extension plate 43 is received within the installation groove 71. The sealing member 70 includes a sealing ring body 72 and a sealing lip 73. The sealing ring body 72 is fixed to the radially outer end of the extension plate 43, and the sealing lip 73 is connected to the sealing ring body 72. The sealing lip 73 is one or a plurality arranged axially along the sealing ring body 72. At least one sealing lip 73 includes a first sealing lip 79, and the first sealing lip 79 abuts against the outer rotor housing 21. The compression amount of the first sealing lip 79 is c, and the value range of c is 0 mm to 2 mm. An activity notch 74 for the movement of the first sealing lip 79 is formed on the outer peripheral surface of the sealing ring body 72. The outer peripheral surface of the sealing ring body 72 is a second surface 75, and a first gap 76 is defined between the second surface 75 and the groove side wall 53.

[0162] A mating groove 44 is formed on the inner peripheral wall of the outer rotor housing 21, and the mating groove 44 is an annular shape extending along the circumferential direction of the outer rotor housing 21. At least a part of the extension plate 43 is received in the mating groove 44. In the radial direction of the outer rotor housing 21, the inner peripheral wall of the mating groove 44 has a stepped structure. The part of the inner wall of the mating groove 44 that is opposite to the extension plate 43 in the axial direction is the groove bottom wall 52, and the part of the inner wall of the mating groove 44 that is opposite to the extension plate 43 in the radial direction is the groove side wall 53. A sealing boss 58 is provided at the connection between the groove bottom wall 52 and the groove side wall 53, and the first sealing lip 79 abuts against the sealing boss 58. The sealing boss 58 has a first step surface 59 and a second step surface 60 arranged at an angle. The first step surface 59 is connected between the groove side wall 53 and the second step surface 60, and the first sealing lip 79 abuts against the first step surface 59. The sealing boss 58 has a first step surface 59 and a second step surface 60 arranged at an angle. The first step surface 59 is connected between the groove side wall 53 and the second step surface 60, and the first sealing lip 79 abuts against the first step surface 59. There is an angle between the protruding direction of the first sealing lip 79 relative to the seal ring body 72 and the first step surface 59, and the first sealing lip 79 extends obliquely in the direction of approaching the groove bottom wall 52 in the radially outward direction.

[0163] There are multiple sealing lips 73, and the multiple sealing lips 73 further include a second sealing lip 80, and the second sealing lip 80 is arranged opposite to the second step surface 60. At least a part of the sealing boss 58 is received in the sealing space defined between the second sealing lip 80 and the first sealing lip 79. A second gap 77 is defined between the second sealing lip 80 and the second step surface 60.

[0164] There are multiple sealing lips 73, and the multiple sealing lips 73 further include a second sealing lip 81, and the second sealing lip 81 is located axially outside the first sealing lip 79. A third gap 78 is defined between the second sealing lip 81 and the groove side wall 53. The second sealing lip 81 extends obliquely in the direction of moving away from the first sealing lip 79 in the radially outward direction. A moving space 82 for the first sealing lip 79 to move is defined between the second sealing lip 81 and the first sealing lip 79.

[0165] In the description of the present invention, it should be understood that 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. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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 invention.

[0166] In the description of the present utility model, the "first feature" and the "second feature" may include one or more of such features.

[0167] In the description of the present utility model, the meaning of "a plurality of" is two or more.

[0168] 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.

[0169] 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.

[0170] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative 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 a suitable manner in any one or more embodiments or examples.

[0171] 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 motor, characterized in that: include: An outer rotor assembly, comprising an outer rotor shell, an outer rotor and a rotating shaft, wherein the outer rotor comprises a rotor core and a magnetic steel, the outer rotor is located in the outer rotor shell and fixed to the outer rotor shell, the rotating shaft is connected to the outer rotor shell, one axial side of the outer rotor shell is open to form an open opening and the other axial side of the outer rotor shell is closed; A stator assembly, the stator assembly is located in the outer rotor housing and is sleeved on the outer circumference of the rotating shaft, and the outer rotor is sleeved on the outer circumference of the stator assembly; Among them, one end of the outer rotor assembly adjacent to the open opening of the outer rotor shell is a first mating end, and one end of the stator assembly adjacent to the open opening of the outer rotor shell is a second mating end, and a sealing structure is provided between the first mating end and the second mating end.

2. The outer rotor motor according to claim 1, characterized in that: The sealing structure includes a first sealing structure and a second sealing structure, the first sealing structure is arranged at the first mating end and at the outer rotor shell, the second sealing structure is arranged at the second mating end and at the outer peripheral side of the stator assembly, the second sealing structure and the first sealing structure are both in the form of a ring extending along the circumference of the stator assembly, and the second sealing structure is sealed and matched with the first sealing structure.

3. The outer rotor motor according to claim 2, characterized in that: The second sealing structure includes an annular extension plate, which is connected to the outer peripheral side of the stator assembly and is arranged around the stator assembly. A matching groove is formed on the inner peripheral wall of the outer rotor shell. The matching groove is annular and extends along the circumference of the outer rotor shell. At least a portion of the extension plate is accommodated in the matching groove.

4. The outer rotor motor according to claim 3, characterized in that: The stator assembly includes a stator and a plastic sealing part, the stator and the plastic sealing part are injection molded as one piece, the plastic sealing part includes an outer end plastic sealing part, the outer end plastic sealing part is located on the side of the stator facing the open opening of the outer rotor shell, and the extension plate is connected to the outer peripheral wall of the outer end plastic sealing part and is injection molded as one piece with the plastic sealing part.

5. The outer rotor motor according to claim 3, characterized in that: Along the radial direction of the outer rotor shell, the inner peripheral wall of the matching groove has a step-shaped structure.

6. The outer rotor motor according to claim 3, characterized in that: The first sealing structure includes a protective plate, which is arranged on the outer rotor shell and is in a ring shape extending along the circumference of the outer rotor shell. The protective plate includes a fixing portion and a protective portion arranged in a radial direction. The fixing portion is fixed to the axial end surface of the outer rotor shell. In the axial direction of the stator assembly, the protective portion is located on the outside of the extension plate.

7. The outer rotor motor according to claim 6, characterized in that: A matching notch extending along the circumferential direction of the extension plate is formed on the extension plate, and the protection portion is accommodated in the matching notch.

8. The outer rotor motor according to claim 7, characterized in that: The gap between the protection portion and the inner wall of the matching notch ranges from 0 to 3 mm.

9. The outer rotor motor according to claim 6, characterized in that: The fixing portion is provided with a positioning hole, the outer rotor shell is provided with a positioning protrusion, and the positioning protrusion is inserted into the positioning hole.

10. The outer rotor motor according to claim 6, characterized in that: A sealing protrusion is provided on the axial inner side of the extension plate, and the portion of the inner wall of the matching groove that is opposite to the extension plate in the axial direction is the groove bottom wall. A sealing groove that cooperates with the sealing protrusion is provided on the groove bottom wall, and the sealing protrusion and the sealing groove are both in a ring shape extending along the circumference of the extension plate.

11. The outer rotor motor according to claim 3, characterized in that: The axial inner side of the extension plate is provided with a plurality of first sealing protrusions arranged at intervals along the radial direction, the portion of the inner wall of the mating groove that is opposite to the extension plate in the axial direction is the groove bottom wall, and the groove bottom wall is provided with a plurality of second sealing protrusions arranged at intervals along the radial direction, and the first sealing protrusions and the second sealing protrusions are alternately arranged along the radial direction.

12. The outer rotor motor according to claim 11, characterized in that: The gap between the first sealing protrusion and the second sealing protrusion ranges from 0 to 3 mm.

13. The outer rotor motor according to claim 11, characterized in that: The outer peripheral surface of the extension plate is a first surface, and the first surface extends obliquely toward a direction close to a central axis of the stator assembly in a direction from the bottom wall of the groove to the open opening.

14. The outer rotor motor according to claim 3, characterized in that: A sealing member is provided at the radial outer end of the extension plate. The sealing member is annular and extends along the circumference of the extension plate. The sealing member is located in the matching groove and is used to seal the gap between the radial outer end of the extension plate and the inner wall of the matching groove.

15. The outer rotor motor according to claim 14, characterized in that: A mounting groove is formed on the sealing member, and the radial outer end of the extension plate is accommodated in the mounting groove.

16. The outer rotor motor according to claim 14, characterized in that: The seal includes a sealing ring body and a sealing lip, wherein the sealing ring body is fixed to the radial outer end of the extension plate, and the sealing lip is connected to the sealing ring body. The sealing lip is one or a plurality of sealing lips arranged along the axial direction of the sealing ring, and at least one of the sealing lips includes a first sealing lip, which abuts against the outer rotor shell.

17. The outer rotor motor according to claim 16, characterized in that: The compression amount of the first sealing lip is 0-2 mm.

18. The outer rotor motor according to claim 16, characterized in that: An active notch for the first sealing lip to move is formed on the outer peripheral surface of the sealing ring body.

19. The outer rotor motor according to claim 16, characterized in that: The outer peripheral surface of the sealing ring body is the second surface, the portion of the inner wall of the matching groove opposite to the extension plate in the radial direction is the groove side wall, and a first gap is defined between the second surface and the groove side wall.

20. The outer rotor motor according to claim 16, characterized in that: The portion of the inner wall of the mating groove that is opposite to the extension plate in the axial direction is the groove bottom wall, and the portion of the inner wall of the mating groove that is opposite to the extension plate in the radial direction is the groove side wall. A sealing boss is provided at the connection between the groove bottom wall and the groove side wall, and the first sealing lip abuts against the sealing boss.

21. The outer rotor motor according to claim 20, characterized in that: The sealing boss has a first step surface and a second step surface which are arranged at an angle, the first step surface is connected between the groove side wall and the second step surface, and the first sealing lip abuts against the first step surface.

22. The outer rotor motor according to claim 21, characterized in that An angle is formed between the protruding direction of the first sealing lip relative to the sealing ring body and the first step surface; and / or the first sealing lip extends obliquely from the radially outward direction toward the direction close to the bottom wall of the groove.

23. The outer rotor motor according to claim 21, characterized in that There are multiple sealing lips, and the multiple sealing lips also include a second sealing lip, which is arranged opposite to the second step surface, and at least a part of the sealing boss is accommodated in the sealing space defined between the second sealing lip and the first sealing lip.

24. The outer rotor motor according to claim 23, characterized in that A second gap is defined between the second sealing lip and the second step surface.

25. The outer rotor motor according to claim 16, characterized in that: There are a plurality of sealing lips, and the plurality of sealing lips further include a third sealing lip, and the third sealing lip is located axially outside the first sealing lip.

26. The outer rotor motor according to claim 25, characterized in that A third gap is defined between the third sealing lip and the groove side wall.

27. The outer rotor motor according to claim 25, characterized in that The third sealing lip extends obliquely in a radially outward direction toward a direction away from the first sealing lip.

28. The outer rotor motor according to claim 25, characterized in that A moving space for the first sealing lip to move is defined between the third sealing lip and the first sealing lip.

29. The outer rotor motor according to any one of claims 1 to 28, characterized in that: The inner circumference of the stator assembly defines a bearing chamber, the rotating shaft is inserted into the bearing chamber, the outer rotor motor includes a bearing, the bearing is arranged in the bearing chamber and sleeved on the outer circumference of the rotating shaft, and a sealing cover is provided on the side of the bearing chamber close to the open mouth, and the sealing cover is fixed to the stator assembly.

30. An external rotor fan, characterized in that: include: A wind wheel, comprising a hub and a plurality of blades arranged on an outer peripheral wall of the hub; According to any one of claims 1 to 29, the outer rotor is connected to the hub.

31. The outer rotor fan according to claim 30, characterized in that: A concave cavity is formed in the wheel hub, the outer rotor assembly and the stator assembly are both located in the concave cavity, and at least a portion of the wheel hub constitutes the outer rotor shell.

32. An air conditioner, characterized in that: include: An external rotor blower according to claim 30 or 31.

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