Air conditioner fan motor, air conditioner fan and air conditioner

Abstract

The air conditioner fan motor comprises a stator assembly, the stator assembly comprises a stator body and a cantilever shaft, the stator assembly is provided with a containing cavity, one axial end of the containing cavity is a closed end, the other axial end of the containing cavity is an opening, and the cantilever shaft is arranged in the containing cavity. The cantilever shaft is located in the containing cavity, one end of the cantilever shaft is fixedly connected with the closed end, and the closed end is provided with a reinforcing structure. The rotor assembly comprises a rotor body and a bearing, the rotor assembly is installed in the containing cavity through the opening, the cantilever shaft penetrates through the rotor body and is rotatably matched with the rotor body through the bearing, a first connecting part is formed on the end face of the end, back to the containing cavity, of the rotor body, and a second connecting part is formed on the end face of the end, back to the containing cavity, of the cantilever shaft. And the first connecting part is used for connecting fan blades. The air conditioner fan motor is short in axial size, small in size and small in number of parts.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning fan motors, and more specifically, to an air-conditioning fan motor, an air-conditioning fan and an air conditioner. Background Art

[0002] As one of the main parts of an air conditioner, the permanent magnet motor for a fan will inevitably develop in the direction of miniaturization and light weight under the market cost pressure.

[0003] The air-conditioning fan motors in the related art have problems such as long axial dimensions, large volume, and many parts of the motor, which need to be further improved. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide an air-conditioning fan motor, the axial dimension of which is short, the volume is small, and the number of parts is small.

[0005] Another object of the utility model is to provide an air-conditioning fan with the above air-conditioning fan motor.

[0006] Another object of the utility model is to provide an air conditioner with the above air-conditioning fan.

[0007] The air-conditioning fan motor according to the embodiment of the utility model includes: a stator assembly, the stator assembly includes a stator body and a cantilever shaft, the stator assembly has a receiving cavity, one axial end of the receiving cavity is a closed end, the other axial end of the receiving cavity is an open mouth, the cantilever shaft is located in the receiving cavity and one end is fixedly connected to the closed end, and a strengthening structure is provided at the closed end; a rotor assembly, the rotor assembly includes a rotor body and a bearing, the rotor assembly is installed in the receiving cavity through the open mouth, the cantilever shaft passes through the rotor body and is rotatably matched with the rotor body through the bearing, and a first connecting portion is formed on the end surface of the rotor body facing away from the receiving cavity, and the first connecting portion is used for connecting a fan blade.

[0008] In the air-conditioning fan motor according to the embodiment of the utility model, the cantilever shaft is fixed to the stator body, the rotor body is rotatably matched with the cantilever shaft through a bearing, the fan blade is directly installed on the rotor body. During operation, the cantilever shaft remains stationary, the rotor body rotates to drive the fan blade to rotate, and the stator assembly does not need to be provided with additional components such as a cover plate for forming a bearing chamber, and the cantilever shaft does not need to extend out of the stator body for a long distance. Therefore, the axial dimension of the air-conditioning fan motor is shorter, the number of parts is less, and the structure is more compact. Furthermore, the volume of the air-conditioning fan motor can be reduced, and the structural complexity of the air-conditioning fan motor can be reduced, which is beneficial to the miniaturization and light weight of the air-conditioning fan motor.

[0009] In addition, the air-conditioning fan motor according to the above embodiments of the present invention may further have the following additional technical features:

[0010] According to some embodiments of the present invention, the rotor body has a shaft hole for passing through the cantilever shaft, a receiving groove is formed on the inner peripheral surface of the shaft hole, and the bearing is disposed in the receiving groove.

[0011] According to some embodiments of the present invention, one end face in the axial direction of the bearing is in limit fit with the groove wall surface of the receiving groove, the receiving groove has an opening opposite to the other end face in the axial direction of the bearing, and the other end face in the axial direction of the bearing is in limit fit with a stopper disposed on the cantilever shaft.

[0012] According to some embodiments of the present invention, there are two receiving grooves which are spaced apart in the axial direction, and an elastic gasket is abutted between the groove wall surface of at least one of the receiving grooves and one end face in the axial direction of the bearing.

[0013] According to some embodiments of the present invention, the rotor body includes an insulating main body and an annular convex portion, the annular convex portion is disposed at both axial ends of the insulating main body, the inner peripheral wall of the annular convex portion and the axial end face of the insulating main body jointly define the receiving groove, and a reinforcing rib is connected between the outer peripheral wall of the annular convex portion and the axial end face of the insulating main body.

[0014] According to some embodiments of the present invention, the annular convex portion and the insulating main body are integrally injection-molded.

[0015] According to some embodiments of the present invention, the inner diameter of the shaft hole is greater than the outer diameter of the cantilever shaft.

[0016] According to some embodiments of the present invention, there are two bearings which are spaced apart in the axial direction, the axial end faces at both ends of the rotor body are respectively a first end face and a second end face, the first connecting portion is disposed on the second end face, the distance between the bearing close to the first end face and the first end face is D1, the distance between the bearing close to the second end face and the second end face is D2, and D1 is less than D2.

[0017] According to some embodiments of the present invention, the inner peripheral surface of the bearing is in interference fit with the cantilever shaft, and the outer peripheral surface of the bearing is in transitional fit with the rotor body.

[0018] According to some embodiments of the present invention, the cantilever shaft is provided with a stopper, the other end face of the bearing abuts against the stopper, and the distance between the stopper close to the closed end and the closed end is greater than zero.

[0019] According to some embodiments of the present utility model, one end face in the axial direction of the rotor assembly is located outside the accommodation cavity, and the other end face of the cantilever shaft is located on one side close to the closed end of the end face in the axial direction of the rotor assembly.

[0020] According to some embodiments of the present utility model, the strengthening structure includes a strengthening convex part and a first strengthening rib arranged at the closed end. One end of the cantilever shaft passes through the strengthening convex part and is fixedly connected to the strengthening convex part, and the first strengthening rib is connected between the strengthening convex part and the wall surface of the closed end.

[0021] According to some embodiments of the present utility model, the middle part of the closed end is recessed in a direction away from the open end to form a concave cavity, the strengthening convex part is formed on the bottom wall of the concave cavity, and the first strengthening rib is connected between the strengthening convex part and the wall surface of the concave cavity.

[0022] According to some embodiments of the present utility model, the strengthening structure includes a second strengthening rib. The second strengthening rib is located in the accommodation cavity and connects the closed end and the circumferential wall surface of the accommodation cavity.

[0023] According to some embodiments of the present utility model, a plurality of first strengthening ribs and a plurality of second strengthening ribs are formed on the side wall surface of the closed end facing the accommodation cavity. The plurality of first strengthening ribs are arranged at intervals in the circumferential direction, the plurality of second strengthening ribs are arranged at intervals in the circumferential direction, and the second strengthening ribs and the first strengthening ribs are arranged in one-to-one correspondence in the radial direction.

[0024] According to some embodiments of the present utility model, at least one concave part is provided on the outer peripheral surface of the end part of the stator body close to the closed end. The concave part extends along the circumferential direction of the stator body. The strengthening structure includes a third strengthening rib arranged in the concave part, and the third strengthening rib connects the bottom wall and the side wall of the concave part.

[0025] According to some embodiments of the present utility model, there are a plurality of the concave parts, and the third strengthening ribs of adjacent concave parts are arranged in one-to-one correspondence in the radial direction.

[0026] According to some embodiments of the present utility model, one end of the cantilever shaft is injection-molded and connected to the stator body.

[0027] According to some embodiments of the present utility model, a groove and / or a protrusion are / is provided on the circumferential side wall of one end of the cantilever shaft, and the closed end covers the groove and / or the protrusion.

[0028] According to some embodiments of the present utility model, one end face of the cantilever shaft is exposed on the outer wall surface of the closed end.

[0029] According to some embodiments of the present utility model, the air-conditioning blower motor further includes two annular flanges, the two annular flanges are respectively a first annular flange and a second annular flange, the first annular flange is connected to the outer peripheral wall of the rotor body, and the second annular flange is connected to the end of the stator body having the open end.

[0030] The first annular flange is disposed around the second annular flange, and the outer peripheral surface of the second annular flange extends axially in a direction close to the stator assembly and inclines inwardly; or,

[0031] The second annular flange is disposed around the first annular flange, and the outer peripheral surface of the first annular flange extends axially in a direction away from the stator body and inclines inwardly.

[0032] The air-conditioning blower according to an embodiment of the present utility model includes the air-conditioning blower motor according to an embodiment of the present utility model.

[0033] The air-conditioning according to an embodiment of the present utility model includes the air-conditioning blower according to an embodiment of the present utility model.

[0034] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0036] Figure 1 is the front view of the air-conditioning blower motor according to an embodiment of the present utility model;

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

[0038] Figure 3 is Figure 1 the sectional view taken along line B-B in

[0039] Figure 4 is Figure 2 the structural schematic diagram of part A in

[0040] Figure 5 is Figure 2 the structural schematic diagram of part B in

[0041] Figure 6 is the first three-dimensional structural diagram of the rotor assembly of the air-conditioning blower motor according to an embodiment of the present utility model;

[0042] Figure 7It is a cross-sectional view of a rotor assembly of an air-conditioning fan motor according to an embodiment of the present utility model;

[0043] Figure 8 It is a cross-sectional view of a rotor body in a rotor assembly of an air-conditioning fan motor according to an embodiment of the present utility model;

[0044] Figure 9 It is a second three-dimensional structure diagram of a rotor assembly of an air-conditioning fan motor according to an embodiment of the present utility model, wherein an end portion of the rotor assembly close to the open end is shown;

[0045] Figure 10 It is a third three-dimensional structure diagram of a rotor assembly of an air-conditioning fan motor according to an embodiment of the present utility model, wherein an end portion of the rotor assembly far from the open end is shown;

[0046] Figure 11 It is a first cross-sectional view of a stator assembly of an air-conditioning fan motor according to an embodiment of the present utility model;

[0047] Figure 12 For Figure 11 A structural schematic diagram of part C in;

[0048] Figure 13 It is a second cross-sectional view of a stator assembly of an air-conditioning fan motor according to an embodiment of the present utility model;

[0049] Figure 14 It is a first three-dimensional structure diagram of a stator assembly of an air-conditioning fan motor according to an embodiment of the present utility model;

[0050] Figure 15 It is a second three-dimensional structure diagram of a stator assembly of an air-conditioning fan motor according to an embodiment of the present utility model;

[0051] Figure 16 It is a front view of a stator assembly of an air-conditioning fan motor according to an embodiment of the present utility model;

[0052] Figure 17 It is a cross-sectional view of an air-conditioning fan according to an embodiment of the present utility model;

[0053] Figure 18 It is a structural schematic diagram of an air-conditioning according to an embodiment of the present utility model.

[0054] Reference numerals:

[0055] Air-conditioning 2000; Air-conditioning fan 1000; Air-conditioning fan motor 100;

[0056] Stator assembly 10;

[0057] Stator body 11; Stator core 12; Insulating bracket 131; Stator insulator 14;

[0058] Receiving cavity 141; Closed end 142; Outer wall surface 1421 of the closed end; Concave cavity 1422;

[0059] Open end 143; Second annular flange 144; Third annular flange 145; Recess 146;

[0060] Connecting ear 147; Counterbore 1471; Second connecting portion 148; Opening 1481;

[0061] Buffer member 149; Limit boss 1491; Stator winding 17;

[0062] Cantilever shaft 15;

[0063] Blocking member 151; End face 152 of one end of the cantilever shaft; Groove 154; Card slot 155; Pin 16;

[0064] Rotor assembly 20;

[0065] Rotor core 21; Magnet 22; Rotor insulator 23; Insulating body 231;

[0066] Annular convex portion 232; First segment 2321; Second segment 2322; Second annular portion 233;

[0067] Reinforcing rib 234; First connecting portion 235; First annular flange 236; Receiving groove 237;

[0068] Shaft hole 239; First end face 2310; Second end face 2311; Bearing 24;

[0069] Annular groove 25; Rotor body 26;

[0070] Fan blade 30; Elastic gasket 40.

[0071] Reinforcing convex portion 41; First reinforcing rib 42; Second reinforcing rib 43; Third reinforcing rib 44; Axial direction F. Detailed implementation manners

[0072] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0073] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial direction F", "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0074] In the description of the present utility model, the "first feature" and "second feature" may include one or more of such features. The meaning of "a plurality" is two or more. The first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may also include the first and second features not being in direct contact but being in contact through additional features therebetween. The first feature being "above", "over" and "on" 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.

[0075] Currently, the air-conditioning fan motor usually has a traditional inner rotor structure. The rotating shaft rotates together with the inner rotor, and the output torque of the air-conditioning fan motor is transmitted through the rotating shaft. Since the rotating shaft needs to rotate relative to the stator assembly, bearing chambers need to be additionally designed at both axial ends of the stator assembly to support the bearings. The bearings support the rotating shaft for the rotating shaft and the inner rotor to rotate together, and the rotating shaft needs to extend out of the stator assembly by a relatively long length to facilitate the installation of the fan blade. Therefore, the existing air-conditioning fan motor has a relatively long axial dimension, a large number of components, a large volume, and a complex structure.

[0076] However, the present application proposes an air-conditioning fan motor 100. The cantilever shaft 15 is fixed to the stator body 11. The rotor body 26 is rotatably fitted with the cantilever shaft 15 through a bearing 24. The fan blade 30 is directly installed on the rotor body 26. During operation, the cantilever shaft 15 remains stationary, and the rotor body 26 rotates to drive the fan blade 30 to rotate. The structure is more compact. The stator assembly 10 does not need to be provided with additional components such as a cover plate for forming a bearing chamber. The cantilever shaft 15 does not need to extend out of the stator body 11 by a long distance. Thus, the axial F dimension of the air-conditioning fan motor 100 is shorter and the number of components is less, thereby reducing the volume of the air-conditioning fan motor 100 and lowering the complexity of the structure of the air-conditioning fan motor 100, which is beneficial to the miniaturization and lightweight of the air-conditioning fan motor 100.

[0077] The air-conditioning fan motor 100 according to an embodiment of the present utility model will be described below with reference to the drawings.

[0078] Refer to Figures 1 - 16As shown in the figure, the air-conditioning fan motor 100 according to an embodiment of the present utility model may include a stator assembly 10 and a rotor assembly 20.

[0079] The stator assembly 10 includes a stator body 11 and a cantilever shaft 15. The stator assembly 10 has a receiving cavity 141. One axial F end of the receiving cavity 141 is a closed end 142, and the other axial F end of the receiving cavity 141 is an open mouth 143, where the axial F refers to the extending direction of the central axis of the cantilever shaft 15. The cantilever shaft 15 is located in the receiving cavity 141 and one end is fixedly connected to the closed end 142. The closed end 142 is provided with a strengthening structure; the rotor assembly 20 includes a rotor body 26 and a bearing 24. The rotor assembly 20 is installed in the receiving cavity 141 through the open mouth 143. The cantilever shaft 15 passes through the rotor body 26 and is rotatably matched with the rotor body 26 through the bearing 24. A first connecting portion 235 is formed on the end face of one axial F end of the rotor body 26 facing away from the receiving cavity 141, and the first connecting portion 235 is used to connect the fan blade 30.

[0080] In the related art, the stator insulator includes an insulating body and end caps covering the axial two ends of the insulating body and opening at both ends. The two end caps define a bearing chamber for accommodating the bearing. The bearings in the bearing chambers at both ends are used to penetrate and support the rotating shaft. The rotating shaft is fixed to the rotor insulator, and the rotor insulator drives the fan blade installed on the rotating shaft to rotate through the rotating shaft.

[0081] In the present application, the design of setting end caps on the stator body 11 is cancelled. The cantilever shaft 15 is directly connected to the closed end 142 of the stator body 11. The structural integrity of the stator body 11 is good, the number of components is small, the volume is small, and the assembly is more convenient. The open mouth 143 is used to install the rotor assembly 20 in the receiving cavity 141. That is to say, the outer diameter of the open mouth 143 is larger than the maximum outer diameter of the rotor assembly 20. The other end of the receiving cavity 141 is directly designed as the open mouth 143 to facilitate the installation of the rotor assembly 20, and at the same time, the number of components is small and the assembly is convenient. The rotor assembly 20 is installed in the receiving cavity 141. That is to say, the air-conditioning fan motor 100 in the present application is an inner rotor motor, and the structure is more compact.

[0082] The cantilever shaft 15 passes through the rotor body 26 and is rotatably matched with the rotor body 26 through the bearing 24. Specifically, the outer ring of the bearing 24 is matched with the rotor body 26, and the inner ring of the bearing 24 is used to penetrate the cantilever shaft 15 and is matched with the cantilever shaft 15 so that the rotor body 26 can rotate relative to the cantilever shaft 15; a first connecting portion 235 is formed on the end face of one axial F end of the rotor body 26, and the first connecting portion 235 is used to connect the fan blade 30. That is to say, the cantilever shaft 15 is matched with the rotor body 26 through the bearing 24, so that the rotor body 26 can rotate relative to the cantilever shaft 15. The cantilever shaft 15 is fixed, and the rotor body 26 directly drives the fan blade 30 to rotate. The fan blade 30 is used to drive the gas flow.

[0083] Specifically, the first connecting portion 235 may be a plurality of threaded holes, and the fan blade 30 is connected to the rotor body 26 through the threaded holes; alternatively, the first connecting portion 235 may be a plurality of hot melt columns, and the fan blade 30 is hot melt connected to the plurality of hot melt columns.

[0084] In the related art, the fan blade is installed on the rotating shaft, and the rotating shaft drives the fan blade to rotate. In order to enable the rotating shaft to be better connected to the fan blade, the rotating shaft usually extends a relatively long distance from the rotor insulator, resulting in a relatively long axial dimension and a relatively heavy weight of the entire fan motor. In this application, the cantilever shaft 15 is fixed relative to the stator body 11, and the cantilever shaft 15 only plays a role of supporting and limiting the rotor assembly 20. Therefore, the axial dimension F of the cantilever shaft 15 can be designed to be relatively short. Thus, it is beneficial to shorten the axial dimension F of the air-conditioning fan motor 100; at the same time, the fan blade 30 is installed at one axial end F of the rotor body 26, and the connection area between the fan blade 30 and the rotor assembly 20 is larger, and the connection stability is also better.

[0085] Compared with the related art, in which the fan blade is installed on the rotating shaft and the rotor assembly needs to be completely installed inside the stator assembly, and the fan blade needs to be spaced apart from the stator assembly by a certain distance. In this application, the fan blade 30 is directly installed on the rotor assembly 20, and one side of the stator assembly 10 is open. Therefore, the structural arrangement in this application can be more compact, which is beneficial to reducing the size of the entire air-conditioning fan 1000.

[0086] Wherein, the outer ring of the bearing 24 and the rotor body 26 can be in transitional fit, and correspondingly, the inner ring of the bearing 24 and the cantilever shaft 15 are in interference fit, so that the installation stability of the bearing 24 is better.

[0087] In this application, the bearing 24 cooperates with the rotor body 26. For example, it can directly cooperate with the shaft hole 239 of the rotor body 26 itself, so that there is no need to set too many components; secondly, the bearing 24 is also directly arranged in the accommodation cavity 141 of the stator body 11. Therefore, the waterproof-related structure of the air-conditioning fan motor 100 can be greatly simplified. Thus, the embodiments of this application are beneficial to reducing the number of components, volume and axial dimension F of the air-conditioning fan motor 100.

[0088] The closed end 142 is provided with a strengthening structure, and the strengthening structure can be a strengthening cavity formed by the stator body 11, a strengthening rib portion arranged on the stator body 11, etc. The strengthening structure is used to strengthen the closed end 142, so that the closed end 142 has a relatively high structural strength, thereby enhancing the installation strength and stability of the cantilever shaft 15, reducing the possibility that the rotor assembly 20 has radial runout during rotation, resulting in a relatively large operating noise of the air-conditioning fan motor 100 and affecting the operating stability of the air-conditioning fan motor 100, and at the same time making the stator body 11 not easily damaged and having a relatively long service life.

[0089] According to the air-conditioning fan motor 100 of the embodiments of the present utility model, the cantilever shaft 15 is fixed to the stator body 11, the rotor body 26 is rotatably fitted with the cantilever shaft 15 through the bearing 24, the fan blade 30 is directly installed on the rotor body 26. During operation, the cantilever shaft 15 remains fixed, and the rotor body 26 rotates to drive the fan blade 30 to rotate. The stator assembly 10 does not need to be provided with additional components such as a cover plate for forming a bearing chamber, and the cantilever shaft 15 does not need to extend out of the stator body 11 for a long distance, so that the axial F dimension of the air-conditioning fan motor 100 is shorter, the number of components is less, the structure is more compact, and thus the volume of the air-conditioning fan motor 100 can be reduced and the structural complexity of the air-conditioning fan motor 100 can be reduced, which is beneficial to the miniaturization and light weight of the air-conditioning fan motor 100.

[0090] According to some embodiments of the present utility model, reference may be made to Figures 2 - 7 , the rotor body 26 has a shaft hole 239 for passing through the cantilever shaft 15, and a receiving groove 237 is formed on the inner peripheral surface of the shaft hole 239, and the bearing 24 is arranged in the receiving groove 237.

[0091] For example, reference may be made to Figure 7 , the bearing 24 is located on both axial F sides of the magnet 22, and the circumferential side wall of the shaft hole 239 of the part of the rotor body 26 where the magnet 22 is provided in the axial F direction can be located inside the circumferential side wall of the receiving groove 237, so as to minimize the radial dimension of the rotor body 26 as much as possible; the wall thickness of the rotor body 26 located radially inside the magnet 22 can also be thinner, which is beneficial to reducing the mass of the rotor body 26.

[0092] Exemplarily, at least part of the circumferential side wall of the receiving groove 237 and the magnet 22 can be arranged opposite to each other in the radial direction, so that the dimension of the rotor body 26 in the axial F direction can be shortened.

[0093] By providing the receiving groove 237 for accommodating the bearing 24 on the inner peripheral wall of the shaft hole 239, the receiving groove 237 provides an installation position for the bearing 24. During installation, the bearing 24 can be directly placed in the receiving groove 237, which is convenient for installation; at the same time, the receiving groove 237 can limit the axial F position of the bearing 24, and the receiving groove 237 is not easily deformed, and the limiting effect on the bearing 24 is good.

[0094] The bearing 24 is arranged in the shaft hole 239, and the receiving groove 237 formed on the inner peripheral surface of the shaft hole 239 is used to accommodate the bearing 24. There is no need to provide additional components to form a space for accommodating the bearing 24, which is beneficial to reducing the number of components, improving the assembly efficiency, and shortening the axial F dimension.

[0095] In some embodiments, both ends of the shaft hole 239 of the cantilever shaft 15 are open. The openings at both ends of the shaft hole 239 in the axial direction F are formed as openings of the receiving groove 237 opposite to the end face of the other end of the bearing 24 in the axial direction F. In this way, the two bearings 24 cooperating with the cantilever shaft 15 can be respectively inserted into the receiving groove 237 from the openings at both ends of the shaft hole 239 in the axial direction F, which can reduce the installation difficulty of the bearing 24.

[0096] According to some embodiments of the present invention, reference can be made to Figures 2 - 5 , the end face of one end of the bearing 24 in the axial direction F is in limiting cooperation with the groove wall surface of the receiving groove 237. Here, the groove wall surface of the receiving groove 237 refers to the groove wall surface of the receiving groove 237 in the axial direction F. The receiving groove 237 has an opening opposite to the end face of the other end of the bearing 24 in the axial direction F. When installing the bearing 24, the bearing 24 can be inserted into the receiving groove 237 from this opening. The end face of the other end of the bearing 24 in the axial direction F is in limiting cooperation with the stopper 151 provided on the cantilever shaft 15.

[0097] Here, the cooperation between the stopper 151 provided on the cantilever shaft 15 and the groove wall surface of the receiving groove 237 can limit both sides of the bearing 24 in the axial direction F, realizing the fixation of the axial position of the bearing 24 relative to the cantilever shaft 15. At the same time, the bearings 24 at both ends cooperate with the receiving grooves 237 at both ends, so that the bearings 24 at both ends can limit the axial position of the rotor assembly 20 relative to the cantilever shaft 15, preventing the rotor assembly 20 and the bearing 24 from moving significantly relative to the cantilever shaft 15, which is beneficial to reducing the operating noise of the air-conditioning fan motor 100.

[0098] More specifically, the stopper 151 abuts against the end face of the inner ring of the bearing 24 in the axial direction F. The outer ring of the bearing 24 will rotate relative to the stopper 151. The stopper 151 is spaced apart from the outer ring of the bearing 24 in the radial direction, so that the stopper 151 will not generate friction relative to the outer ring of the bearing 24, reducing the heat generated by friction and the noise generated by friction, and improving the operating efficiency of the air-conditioning fan motor 100.

[0099] Specifically, the stopper 151 can be snap-connected to the cantilever shaft 15, or the stopper 151 can also be threadedly connected to the cantilever shaft 15, etc., which is not specifically limited herein.

[0100] According to some embodiments of the present invention, reference can be made to Figure 5 , there are two receiving grooves 237 provided and spaced apart along the axial direction F. An elastic gasket 40 is abutted between the groove wall surface of at least one receiving groove 237 and the end face of one end of the bearing 24 in the axial direction F.

[0101] That is to say, only one elastic gasket 40 can be provided, and one elastic gasket 40 is abutted between the groove wall surface of one receiving groove 237 and the end face of one end of the bearing 24 in the axial direction F (such as Figure 5as shown); alternatively, for the two receiving grooves 237, an elastic gasket 40 is abutted between each receiving groove 237 and the end face of one end of the bearing 24 arranged in the receiving groove 237 along the axial direction F.

[0102] The elastic gasket 40 is used to provide an axial pre-tightening force, so that the end face of the other end of the bearing 24 abuts against the stopper 151 with a certain pre-stress, ensuring that the clearance of the bearing 24 is appropriate, which is beneficial to reducing the problem of vibration noise caused by the axial movement of the bearing 24 along the axial direction F.

[0103] More specifically, the elastic gasket 40 abuts between the outer ring of the bearing 24 and the wall surface of the receiving groove 237, so that the receiving groove 237 is not easy to rotate relative to the elastic gasket 40, and the elastic gasket 40 is not easy to rotate relative to the outer ring of the bearing 24. Therefore, the rotational synchronism between the outer ring of the bearing 24 and the rotor body 26 can be improved, so that the outer ring of the bearing 24 is not easy to relatively slip relative to the rotor body 26, and the possibility of relative friction between the bearing 24 and the rotor body 26 is reduced.

[0104] Specifically, the middle of the elastic gasket 40 is hollow to avoid the cantilever shaft 15. The elastic gasket 40 can be a corrugated gasket. Along the circumferential direction of the elastic gasket 40, the elastic gasket 40 extends in a wave shape, which can provide a large pre-tightening force, is not easy to be damaged, and is convenient for processing.

[0105] According to some embodiments of the present invention, reference can be made to Figures 6 - 10 as shown, the rotor body 26 includes an insulating main body 231 and an annular convex portion 232. The annular convex portion 232 is arranged at both ends of the insulating main body 231 along the axial direction F. The inner peripheral wall of the annular convex portion 232 and the end face of the insulating main body 231 along the axial direction F jointly define the receiving groove 237. A reinforcing rib 234 is connected between the outer peripheral wall of the annular convex portion 232 and the end face of the insulating main body 231 along the axial direction F. Specifically, annular convex portions 232 can be arranged at both ends of the insulating main body 231 along the axial direction F.

[0106] Here, the outer diameter of the annular convex portion 232 is smaller than the outer diameter of the insulating main body 231. By arranging the annular convex portions 232 at both ends of the insulating main body 231 along the axial direction F, the inner peripheral surface of the annular convex portion 232 and the end face of the insulating main body 231 along the axial direction F define the receiving groove 237, and then a reinforcing rib 234 is connected between the outer peripheral surface of the annular convex portion 232 and the end face of the insulating main body 231 along the axial direction F to strengthen the structure of the annular convex portion 232, so that the actual volume and weight of the rotor body 26 can be minimized as much as possible, and thus it is beneficial to reduce the size and weight of the air-conditioning fan motor 100.

[0107] More specifically, the axial dimension F of the annular convex portion 232 is greater than the axial dimension F of the bearing 24, so as to facilitate good support for accommodating the bearing 24; a plurality of reinforcing ribs 234 are provided at equal intervals along the circumferential direction of the annular convex portion 232, so as to provide good support for all parts of the circumferential direction of the annular convex portion 232 and reduce the possibility of radial runout of the rotor body 26 during rotation.

[0108] According to some embodiments of the present invention, the annular convex portion 232 and the insulating body 231 are integrally injection-molded. In this way, the number of components of the rotor assembly 20 is smaller, the assembly is more convenient, and the integrality of the annular convex portion 232 and the insulating body 231 is better. The annular convex portion 232 and the insulating body 231 are not easily separated, and the connection stability is better.

[0109] In other embodiments, the annular convex portion 232 and the insulating body 231 can also be separately formed and then heat-melted and connected, or connected by a connecting member, or connected to each other through sub-connecting portions provided on the annular convex portion 232 and the insulating body 231.

[0110] According to some embodiments of the present invention, reference can be made to Figure 2 and Figure 3 , the inner diameter of the shaft hole 239 is greater than the outer diameter of the cantilever shaft 15.

[0111] In this way, the inner side wall of the shaft hole 239 can be spaced apart from the cantilever shaft 15, avoiding friction between the inner side wall of the shaft hole 239 and the cantilever shaft 15, which is beneficial to improving the operating efficiency of the air-conditioning fan motor 100.

[0112] According to some embodiments of the present invention, reference can be made to Figure 2 and Figure 7 , two bearings 24 are provided and spaced apart along the axial direction F. The two end faces of the rotor body 26 along the axial direction F are respectively the first end face 2310 and the second end face 2311. The first connecting portion 235 is provided on the second end face 2311. On the premise of meeting the layout requirements, the two bearings 24 should be arranged as close as possible to the first end face 2310, that is, close to the end of the cantilever shaft 15 fixed to the closed end 142, so that the torque received by the end of the cantilever shaft 15 fixed to the closed end 142 can be minimized, reducing the possibility of damage and deformation of the closed end 142 of the stator body 11.

[0113] Exemplarily, for example, reference can be made to Figure 7, the distance between the bearing 24 near the first end face 2310 and the first end face 2310 is D1, and the distance between the bearing 24 near the second end face 2311 and the second end face 2311 is D2. D1 is less than D2, so that the bearing 24 near the second end face 2311 is as close as possible to the first end face 2310, which can make the torque received by the end of the cantilever shaft 15 connected to the closed end 142 as small as possible, and reduce the possibility of damage and deformation of the closed end 142 of the stator body 11.

[0114] In some embodiments, the axial dimension F of the annular convex portion 232 near the first end face 2310 is less than the axial dimension F of the annular convex portion 232 near the second end face 2311. Reference can be made to Figure 7 and Figure 8 , the annular convex portion 232 near the second end face 2311 includes a first section 2321 and a second section 2322 that are axially connected. The first section 2321 is used to accommodate the bearing 24 and cooperate with the outer peripheral surface of the outer ring of the bearing 24. The second section 2322 is located on the side of the first section 2321 close to the second end face 2311, and the inner diameter of the second section 2322 is greater than the inner diameter of the first section 2321. In this way, when the bearing 24 is installed in the receiving groove 237 near the second end face 2311, the second section 2322 can guide the bearing 24, so that it is more smooth when the bearing 24 is installed in the first section 2321.

[0115] According to some embodiments of the present invention, the inner peripheral surface of the bearing 24 is in interference fit with the cantilever shaft 15, and the outer peripheral surface of the bearing 24 is in transitional fit with the rotor body 26.

[0116] It should be noted that the cantilever shaft 15 is usually a metal part. The inner peripheral surface of the bearing 24 is in interference fit with the cantilever shaft 15, and the cantilever shaft 15 is not easily deformed. The installation and fixation stability of the bearing 24 and the cantilever shaft 15 is good, and the installation accuracy is high. The outer peripheral surface of the bearing 24 is in transitional fit with the rotor body 26. In this way, the installation of the bearing 24 is not likely to cause deformation of the rotor body 26.

[0117] According to some embodiments of the present invention, the cantilever shaft 15 is provided with a stopper 151, and the other end face of the bearing 24 abuts against the stopper 151. Specifically, for the bearing 24 near the closed end 142, a stopper 151 is provided between the other end face of the bearing 24 and the closed end 142. The stopper 151 is installed on the cantilever shaft 15 and is used for limiting cooperation with the other end face of the bearing 24. For the bearing 24 near the open end 143, a stopper 151 is provided between the other end face of the bearing 24 and the open end 143. The stopper 151 is installed on the cantilever shaft 15 and is used for limiting cooperation with the other end face of the bearing 24.

[0118] The distance L between the stopper 151 near the closed end 142 and the closed end 142 is greater than zero. Here, it means that the minimum distance between the part of the closed end 142 opposite to the stopper 151 in the axial direction F and the stopper 151 is greater than zero. That is to say, the stopper 151 and the closed end 142 do not contact each other. In this way, the possibility that the pressure of the rotor body 26 on the bearing 24 is transmitted to the closed end 142 through the stopper 151 can be reduced, and thus the possibility of deformation and damage of the stator body 11 can be reduced.

[0119] Exemplarily, the distance between the stopper 151 near the closed end 142 and the closed end 142 can be L, where L≥0.5mm. For example, L can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc., but not limited thereto. When the process and the strength of the stopper 151 permit, the smaller the distance between the stopper 151 near the closed end 142 and the closed end 142, the better, so as to reduce the torque received at the end of the cantilever shaft 15 connected to the closed end 142.

[0120] Specifically, as Figure 4 shown, the stopper 151 can be a snap ring. A groove 155 for installing the snap ring is provided on the cantilever shaft 15. During installation, the snap ring is clamped in the groove 155, with a simple structure and convenient installation.

[0121] According to some embodiments of the present invention, reference can be made to Figure 2 and Figure 3 , one end face of the rotor assembly 20 in the axial direction F is located outside the accommodation cavity 141. In this way, on the one hand, it is convenient to connect one end face of the rotor assembly 20 in the axial direction F to the fan blade 30, and the fan blade 30 is not easily in contact with the stator assembly 10; on the other hand, a part of the wall surface of the rotor assembly 20 extending out of the accommodation cavity 141 can be connected to the first annular flange 236 to achieve a better waterproof effect. The other end face of the cantilever shaft 15 is located on the side close to the closed end 142 of one end face of the rotor assembly 20 in the axial direction F. That is to say, the axial dimension of the cantilever shaft 15 is short. In this way, the torque received at the end of the cantilever shaft 15 connected to the closed end 142 is small, and at the same time, the cantilever shaft 15 is not easily interfere with the installation of the fan blade 30.

[0122] According to some embodiments of the present invention, reference can be made to Figure 3 , Figures 11 - 14 , the strengthening structure includes a strengthening convex part 41 provided on the closed end 142 and a first strengthening rib 42. One end of the cantilever shaft 15 passes through the strengthening convex part 41 and is fixedly connected to the strengthening convex part 41. The first strengthening rib 42 is connected between the strengthening convex part 41 and the wall surface of the closed end 142.

[0123] Specifically, the reinforcing protrusion 41 can protrude axially F outward relative to the closed end 142, that is, the reinforcing protrusion 41 is located outside the accommodating cavity 141; or, as Figure 3 , Figures 11 - 14 shown, the reinforcing protrusion 41 can protrude axially F inward relative to the closed end 142, that is, the reinforcing protrusion 41 is located inside the accommodating cavity 141.

[0124] The cantilever shaft 15 is an installation structure that supports the rotation of the rotor assembly 20. One end of the cantilever shaft 15 is fixed, and the other end of the cantilever shaft 15 is suspended. The longer the cantilever shaft 15 is, the farther the other end of the cantilever shaft 15 is from the closed end 142, the worse the support strength is, and the more likely radial runout occurs. In the embodiment of the present application, a reinforcing protrusion 41 is provided at the closed end 142. One end of the cantilever shaft 15 passes through the reinforcing protrusion 41 and is fixedly connected to the reinforcing protrusion 41. Thus, the connection area between the cantilever shaft 15 and the stator body 11 is larger, which is beneficial to increasing the installation strength and stability of the cantilever shaft 15, and reducing the problems that the radial runout occurs when the rotor assembly 20 rotates, resulting in poor motor noise of the air-conditioning fan 100 and affecting the stability of the air-conditioning fan motor 100.

[0125] At the same time, a first reinforcing rib 42 is provided to connect the reinforcing protrusion 41 and the wall surface of the closed end 142, so as to enhance the structural strength of the reinforcing protrusion 41, reduce the possibility of deformation of the reinforcing protrusion 41, and further increase the installation strength and stability of the cantilever shaft 15.

[0126] In some embodiments, the reinforcing protrusion 41 and the first reinforcing rib 42 can be integrally formed with the stator body 11 to reduce the number of components and assembly processes. At the same time, the integrality between the reinforcing protrusion 41 and the stator body 11 is better, and it is not easy to separate between the reinforcing protrusion 41 and the stator body 11. It can be understood that the axial F and radial dimensions of the reinforcing protrusion 41 need to meet the forming and operating conditions of the air-conditioning fan 1000.

[0127] According to some embodiments of the present invention, reference can be made to Figure 3 , a concave cavity 1422 is formed by the middle part of the closed end 142 recessing in a direction away from the open end 143. The reinforcing protrusion 41 is formed on the bottom wall of the concave cavity 1422, and a first reinforcing rib 42 is connected between the reinforcing protrusion 41 and the wall surface of the concave cavity 1422.

[0128] That is to say, only a part of the closed end 142 is recessed away from the open end 143 to form a concave cavity 1422. Compared with directly increasing the axial F distance between the entire closed end 142 and the open end 143, only the middle part of the closed end 142 is recessed away from the open end 143 to form the concave cavity 1422. In this way, the volume of the stator body 11 is smaller, the mass is lighter, and the closed end 142 is formed with the concave cavity 1422. In this way, the overall structural strength of the closed end 142 is also higher, and it is not easy to deform. The reinforcing convex part 41 is formed on the bottom wall of the concave cavity 1422, so that the reinforcing convex part 41 is not easy to deform and shake either. Furthermore, the installation strength and stability of the cantilever shaft 15 can be further increased.

[0129] Specifically, the first reinforcing rib 42 is connected between the radial wall surface and the circumferential wall surface of the concave cavity 1422 and the reinforcing convex part 41, so that the connection area of the first reinforcing rib 42 and the closed end 142 is larger, and the supporting effect on the reinforcing convex part 41 is better.

[0130] Exemplarily, the first reinforcing rib 42 can be a strip-shaped reinforcing rib, or the first reinforcing rib 42 can be a triangular reinforcing rib, or the first reinforcing rib 42 can also be a trapezoidal reinforcing rib, etc., and no specific limitation is made here.

[0131] According to some embodiments of the present invention, the reinforcing structure includes a second reinforcing rib 43. The second reinforcing rib 43 is located in the accommodating cavity 141 and connects the closed end 142 and the circumferential wall surface of the accommodating cavity 141.

[0132] Specifically, the second reinforcing rib 43 is connected between the circumferential edge of the closed end 142 and the circumferential wall surface of the accommodating cavity 141. By providing the second reinforcing rib 43 to strengthen the closed end 142, it is beneficial to further reduce the possibility of deformation of the closed end 142 under the action of the cantilever shaft 15, and thus it is beneficial to further increase the installation strength and stability of the cantilever shaft 15. Compared with increasing the overall thickness of the part of the closed end 142 where the concave cavity 1422 is not formed as a whole, only a plurality of second reinforcing ribs 43 are provided to strengthen the part of the closed end 142 where the concave cavity 1422 is not provided. In this way, the mass of the stator body 11 is lighter, which is beneficial to the lightweight design of the air-conditioning fan motor 100.

[0133] The wall body of the closed end 142 where the concave cavity 1422 is formed is the first wall body, the circumferential edge of the closed end 142 is the second wall body, the second wall body can connect the first wall body and the circumferential wall body of the accommodating cavity 141, and the circumferential wall body of the accommodating cavity 141 and the second wall body play a role in supporting the first wall body.

[0134] Exemplarily, the second reinforcing rib 43 can be a strip-shaped reinforcing rib, or the second reinforcing rib 43 can be a triangular reinforcing rib, or the second reinforcing rib 43 can also be a trapezoidal reinforcing rib, etc., and no specific limitation is made here.

[0135] In some embodiments, the second reinforcing rib 43 or the first reinforcing rib 42 may also be directly connected between the wall surface of the concave cavity 1422 and the wall surface of the accommodating cavity 141.

[0136] According to some embodiments of the present utility model, as Figure 14 and Figure 16 shown, a plurality of first reinforcing ribs 42 and a plurality of second reinforcing ribs 43 are formed on the side wall surface of the closed end 142 facing the accommodating cavity 141. The plurality of first reinforcing ribs 42 are arranged at intervals in the circumferential direction, the plurality of second reinforcing ribs 43 are arranged at intervals in the circumferential direction, and the second reinforcing ribs 43 and the first reinforcing ribs 42 are arranged in one-to-one correspondence in the radial direction.

[0137] That is to say, the second reinforcing rib 43 is arranged on the force transmission path of the first reinforcing rib 42. When the first reinforcing rib 42 applies a force to the closed end 142, the second reinforcing rib 43 can better transmit the force, so that the closed end 142 is not easily deformed, so as to further increase the installation strength and stability of the cantilever shaft 15.

[0138] Specifically, the plurality of first reinforcing ribs 42 are arranged at evenly spaced intervals in the circumferential direction, and the plurality of second reinforcing ribs 43 are arranged at evenly spaced intervals in the circumferential direction.

[0139] According to some embodiments of the present utility model, reference may be made to Figure 3 shown, at least one recess 146 is provided on the outer peripheral surface of the end portion of the stator body 11 close to the closed end 142. The recess 146 extends along the circumferential direction of the stator body 11, as Figure 15 shown, the reinforcing structure includes a third reinforcing rib 44 provided in the recess 146, and the third reinforcing rib 44 connects the bottom wall and the side wall of the recess 146.

[0140] Exemplarily, reference may be made to Figure 3 , a recess 146 is defined between the outer circumferential wall surface of the portion of the closed end 142 where the concave cavity 1422 is formed and the outer wall surface of the circumferential edge of the closed end 142.

[0141] By providing the recess 146 on the outer peripheral surface of the end portion of the stator body 11 close to the closed end 142 and simultaneously providing the third reinforcing rib 44 to strengthen the position where the recess 146 is provided, on the one hand, the volume and weight of the stator body 11 can be reduced, which is beneficial to the lightweight and miniaturized design of the air-conditioning blower motor 100; on the other hand, the end portion of the stator body 11 close to the closed end 142 can also have better structural strength, and the fixing strength and stability between the stator body 11 and the cantilever shaft 15 are also better.

[0142] It should be noted that the concave portion 146 is located on the axial F side of the stator winding 17 and the stator core 12, that is, the setting position of the concave portion 146 avoids the stator winding 17 and the stator core 12, so that the stator insulator 14 has a good fixing effect on the stator winding 17 and the stator core 12.

[0143] Exemplarily, reference can be made to Figure 3 As shown, a plurality of concave portions 146 may be provided along the axial direction F. Along the axial direction F and in the direction close to the closed end 142, the radius of the circumferential wall surface of the plurality of concave portions 146 gradually decreases. On the one hand, it is convenient for molding and demolding. On the other hand, the size and volume of the stator body 11 can also be relatively small, and at the same time, the structural strength of the end portion of the stator body 11 close to the closed end 142 is relatively high.

[0144] Exemplarily, the concave portion 146 may be arranged around the stator body 11, or the concave portion 146 may only be an arc-shaped concave portion 146, and a plurality of arc-shaped concave portions 146 are arranged at intervals along the circumferential direction of the stator body 11.

[0145] Exemplarily, the third reinforcing rib 44 may be a strip-shaped reinforcing rib, or the third reinforcing rib 44 may be a triangular reinforcing rib, or the third reinforcing rib 44 may also be a trapezoidal reinforcing rib, etc., and no specific limitation is made here.

[0146] According to some embodiments of the present invention, reference can be made to Figure 3 and Figure 15 , a plurality of concave portions 146 are provided, and the third reinforcing ribs 44 of adjacent concave portions 146 are arranged in one-to-one correspondence in the radial direction.

[0147] That is to say, the third reinforcing rib 44 on the radially outer side is located on the force transmission path of the third reinforcing rib 44 on the radially inner side. When the third reinforcing rib 44 on the radially inner side is stressed, the third reinforcing rib 44 on the radially outer side can better transmit the acting force, so that the closed end 142 is not easily deformed, so as to achieve the effect of further increasing the installation strength and stability of the cantilever shaft 15.

[0148] According to some embodiments of the present invention, one end of the cantilever shaft 15 is injection-molded and connected to the stator body 11.

[0149] Compared with the connection method in which the cantilever shaft 15 and the stator body 11 are connected by means of threaded connection or the like, one end of the cantilever shaft 15 is injection-molded and connected to the stator body 11. In this way, the connection stability between the stator body 11 and the cantilever shaft 15 is better, the stator body 11 is not easily disengaged, and the installation accuracy of the cantilever shaft 15 is also higher; at the same time, the connection between the stator body 11 and the cantilever shaft 15 does not require additional assembly steps, which is beneficial to improving the assembly efficiency of the air-conditioning fan motor 100.

[0150] According to some embodiments of the present invention, reference can be made toFigure 12 At one end of the cantilever shaft 15, a groove 154 is provided on the circumferential side wall, and the closed end 142 covers the groove 154.

[0151] According to some embodiments of the present invention, a protrusion is provided on the circumferential side wall at one end of the cantilever shaft 15, and the closed end 142 covers the protrusion.

[0152] According to some embodiments of the present invention, a groove 154 and a protrusion are provided on the circumferential side wall at one end of the cantilever shaft 15, and the closed end 142 covers the groove 154 and the protrusion.

[0153] Exemplarily, only one groove 154 may be provided, or multiple grooves 154 may be provided. Exemplarily, only one protrusion may be provided, or multiple protrusions may be provided.

[0154] One end of the cantilever shaft 15 is connected to the closed end 142 of the stator body 11. By providing a groove 154 and a protrusion on the circumferential side wall at one end of the cantilever shaft 15, the connection area between the cantilever shaft 15 and the stator body 11 can be increased, the bonding force between the cantilever shaft 15 and the stator body 11 can be increased, and the possibility of the cantilever shaft 15 axially disengaging from the stator body 11 in the F direction can be reduced, which is beneficial to increasing the installation stability and installation strength of the cantilever shaft 15.

[0155] According to some embodiments of the present invention, reference can be made to Figure 4 、 Figure 12 As shown, one end face 152 of the cantilever shaft 15 is exposed outside the outer wall surface 1421 of the closed end 142.

[0156] It should be noted that the cantilever shaft 15 can be used as an insert to realize the connection between the stator body 11 and the cantilever shaft 15 during the molding process of the stator body 11. One end face 152 of the cantilever shaft is exposed outside the outer end face of the closed end 142, and the other end of the cantilever shaft 15 is suspended in the accommodation cavity 141. In this way, during injection molding, the injection molding module can abut against both end faces of the cantilever shaft 15, so as to facilitate the positioning of the position of the cantilever shaft 15 and reduce the possibility of the cantilever shaft 15 axially moving in the F direction during injection molding, which is beneficial to making the axially fixed position of the cantilever shaft 15 more accurate.

[0157] In some embodiments, reference can be made to Figure 2 and Figure 3, the rotor assembly 20 includes a rotor body 26 and a bearing 24. The outer ring of the bearing 24 is in transition fit with the rotor body 26, and the inner ring of the bearing 24 is in interference fit with the outer peripheral surface of the cantilever shaft 15. Since the cantilever shaft 15 is a metal part, the bearing 24 and the cantilever shaft 15 are in interference fit, so that both the installation accuracy and stability of the bearing 24 are relatively good. Due to the interference fit between the cantilever shaft 15 and the bearing 24, if one end face 152 of the cantilever shaft is covered within the closed end 142, during the installation process of the bearing 24, only the stator body 11 can be fixed, and one end of the cantilever shaft 15 cannot be directly fixed. The structural strength of the stator body 11 is low, the fixing effect on one end of the cantilever shaft 15 is poor, and it is prone to damage under the relatively large installation pressure of the bearing 24.

[0158] In the embodiment of the present application, one end face 152 of the cantilever shaft is exposed outside the outer wall surface 1421 of the closed end. Thus, when installing the bearing 24, one end face 152 of the cantilever shaft can be directly clamped and fixed, the fixing effect on the cantilever shaft 15 is good, the cantilever shaft 15 is not prone to move under the installation pressure, and the influence of the bearing 24 installation process on the rotor body 26 is relatively small, which can reduce the possibility of damage to the rotor body 26 during the installation process of the bearing 24.

[0159] According to some embodiments of the present invention, the air-conditioning fan motor 100 further includes two annular flanges, which are the first annular flange 236 and the second annular flange 144 respectively. The first annular flange 236 is connected to the outer peripheral wall of the rotor body 26, and the second annular flange 144 is connected to the end of the stator body 11 having an open end 143. The first annular flange 236 is arranged to surround the second annular flange 144, the first annular flange 236 is located radially outside the second annular flange 144, and the outer peripheral surface of the second annular flange 144 extends inwardly in the direction along the axis F towards the stator assembly 10.

[0160] According to some embodiments of the present invention, reference can be made to Figure 2 and Figure 3 , the air-conditioning fan motor 100 further includes two annular flanges, which are the first annular flange 236 and the second annular flange 144 respectively. The first annular flange 236 is connected to the outer peripheral wall of the rotor body 26, and the second annular flange 144 is connected to the end of the stator body 11 having an open end 143. The second annular flange 144 is arranged to surround the first annular flange 236, the second annular flange 144 is located radially inside the first annular flange 236, and the outer peripheral surface of the first annular flange 236 extends inwardly in the direction along the axis F away from the stator body 11.

[0161] It should be noted that the annular flange located on the outer ring can play a role in blocking water. When water flows radially (or from top to bottom) towards the stator body 11, the annular flange on the outer ring will block the water and conduct axial F diversion, reducing the possibility of water directly entering the gap between the stator body 11 and the rotor body 26.

[0162] The water blocked by the annular flange on the outer ring will flow towards the annular flange on the inner ring. For the embodiment where the second annular flange 144 is provided on the inner ring, the outer peripheral surface of the second annular flange 144 extends axially F towards the stator assembly 10 and inclines inward, so that the second annular flange 144 can conduct the water axially F towards the stator body 11, that is, conduct the water in a direction away from the mating gap between the rotor body 26 and the stator body 11; as Figure 2 shown, for the embodiment where the first annular flange 236 is provided on the inner ring, the outer peripheral surface of the first annular flange 236 extends axially F away from the stator body 11 and inclines inward, so that the first annular flange 236 can conduct the water in a direction away from the stator body 11, that is, conduct the water in a direction away from the mating gap between the rotor body 26 and the stator body 11; thus, the possibility of water flowing into the mating gap between the rotor body 26 and the stator body 11 can be reduced, achieving a good waterproof effect.

[0163] Exemplarily, the first annular flange 236 can be integrally formed with the rotor body 26, or the first annular flange 236 can be separately formed from the rotor body 26 and then connected to each other. For example, the rotor body 26 is injection-molded and connected to the first annular flange 236 as a whole.

[0164] Exemplarily, the second annular flange 144 can be integrally formed with the stator body 11, or the second annular flange 144 can also be separately formed from the stator body 11 and then connected to each other. For example, the stator assembly 10 is injection-molded and connected to the second annular flange 144 as a whole.

[0165] In some embodiments, the air-conditioning blower motor 100 may further include a third annular flange 145. Reference can be made to Figure 2, for the embodiment in which the second annular flange 144 is disposed around the first annular flange 236, the third annular flange 145 is connected to the end of the stator body 11 having the open end 143, and the first annular flange 236 is disposed around the third annular flange 145. In this way, it is beneficial to reduce the possibility of moisture and impurities entering the fitting gap between the rotor body 26 and the stator body 11. For the embodiment in which the first annular flange 236 is disposed around the second annular flange 144, the third annular flange 145 is connected to the end of the stator assembly 10 having the open end 143, and the third annular flange 145 is disposed around the first annular flange 236. In this way, it is beneficial to reduce the possibility of impurities entering the fitting gap between the rotor body 26 and the stator body 11, and is beneficial to further increase the waterproof property of the air-conditioning blower motor 100.

[0166] In some embodiments, reference may be made to Figure 6 and Figure 9 , an annular groove 25 is formed on the axial F end face of the rotor body 26 near the open end 143. A portion of the axial F end of the rotor body 26 near the open end 143 located inside the annular groove 25 is formed into an annular convex portion 232. A reinforcing rib 234 for strengthening the annular convex portion 232 is disposed in the annular groove 25, and the reinforcing rib 234 connects the radially opposite wall surfaces of the annular groove 25. A portion of the axial F end of the rotor body 26 near the open end 143 located outside the annular groove 25 is formed into a second annular portion 233, and the second annular portion 233 is connected with a first annular flange 236. In this way, the axial F dimension of the rotor body 26 is smaller, which is beneficial to reducing the axial F dimension of the air-conditioning blower motor 100 and the cantilever shaft 15, so as to reduce the weight of the rotor assembly 20.

[0167] In some embodiments, reference may be made to Figures 6 - 8 , the axial F end face of the annular convex portion 232 near the open end 143 is located axially F inside the axial end face of the second annular portion 233. In this way, the annular convex portion 232 is not likely to interfere with the installation of the fan blade 30, and is beneficial to saving materials and reducing the weight of the rotor body 26.

[0168] According to some embodiments of the present invention, as Figures 14 - 16 shown, a plurality of connecting lugs 147 are provided on the circumferential side wall of the stator body 11. The connecting lugs 147 are provided with second connecting portions 148, and the second connecting portions 148 are used for the installation of the stator assembly 10. As Figure 2 and Figure 3 shown, a buffer member 149 is provided at the second connecting portion 148.

[0169] More specifically, the connecting ear 147 is provided on the radial outer side of the stator winding 17 and the stator core 12. The stator core 12 and the stator winding 17 are relatively heavy. The connecting ear 147 is arranged corresponding to the stator core 12 and the stator winding 17 in the radial direction. In this way, the connecting ear 147 can better support the stator body 11, which is beneficial to reducing the vibration degree of the stator body 11 during operation.

[0170] In some embodiments, as Figure 2 and Figure 3 shown, a buffer member 149 is provided at the second connecting portion 148. It should be noted that the second connecting portion 148 is used to be connected to an external support member through a connecting member. The buffer member 149 is arranged between the connecting member and the second connecting portion 148 to reduce the possibility of direct contact between the connecting member and the second connecting portion 148. The buffer member 149 plays a role in buffering and shock absorption, which is beneficial to reducing the operating noise generated by the air-conditioning blower motor 100 during operation.

[0171] Exemplarily, as Figures 14 - 16 shown, the second connecting portion 148 is a connecting hole axially penetrating through F. The connecting hole has an opening 1481 on the side along the radial direction and away from the stator body 11. A cylindrical buffer member 149 is inserted through the connecting hole. The size of the opening 1481 is smaller than the outer diameter of the cylindrical buffer member 149. The opening 1481 is provided to facilitate the installation of the cylindrical buffer member 149. The size of the opening 1481 is smaller than the outer diameter of the cylindrical buffer member 149, so that the cylindrical buffer member 149 is not easily disengaged from the opening 1481. Limiting bosses 1491 are formed at both ends of the cylindrical buffer member 149. The connecting ear 147 is formed with a counterbore 1471 for accommodating the limiting bosses 1491. The outer diameter of the limiting bosses 1491 is larger than the outer diameter of the middle part of the cylindrical buffer member 149. Thus, the limiting bosses 1491 can play a role in limiting the cylindrical buffer member 149, making the cylindrical buffer member 149 not easily axially disengage from the connecting hole. The counterbore 1471 can position the radial installation position of the cylindrical buffer member 149 to reduce the possibility of the cylindrical buffer member 149 slipping.

[0172] The rotor body 26 includes a rotor core 21, a magnet 22, and a rotor insulator 23. The rotor insulator 23 covers the rotor core 21 and the magnet 22. The rotor insulator 23 has good water-proof, air-proof, and electrical insulation properties. On the one hand, the rotor insulator 23 plays a role in fixing the rotor core 21 and the magnet 22; on the other hand, the rotor insulator 23 can reduce the possibility of contact between the rotor core 21 and the magnet 22 with air and moisture, which is beneficial to extending the service life of the rotor core 21 and the magnet 22.

[0173] In some embodiments, the rotor core 21 is a plurality of segmented rotor cores, and the rotor core has the same number of poles as the air conditioner fan motor 100. The rotor core 21 adopts a segmented structure to improve the utilization rate of stamping of the motor silicon steel material and reduce the magnetic leakage effect of the conduction channel on the rotor core 21. The plurality of magnets 22 are correspondingly built into the plurality of mounting slots of the rotor core 21, and the rotor core 21 and the plurality of magnets 22 are integrally packaged by the rotor body 26 of the PBT material to ensure the safety of the rotor assembly 20 during operation.

[0174] In some embodiments, the connection between the rotor core 21 and the magnet 22 and the rotor insulator 23 can be achieved during the injection molding process of the rotor insulator 23, that is, the rotor insulator 23 is injection molded to connect the rotor core 21 and the magnet 22 to further increase its structural strength and reduce the risk of axial movement of the magnet 22 during the rotation of the rotor body 26 and the risk of the rotor core 21 being detached and thrown out.

[0175] More specifically, the rotor insulator 23 can be made of PBT (polybutylene terephthalate) material, so that the rotor insulator 23 has good comprehensive properties such as heat resistance, flame retardancy, electrical insulation and good processing performance; but not limited to this, the rotor insulator 23 can also be made of other materials such as plastic.

[0176] The stator body 11 includes a stator core 12, a stator winding 17 and a stator body 11. The stator body 11 covers the stator core 12 and the stator winding 17. The stator body 11 has good water-proof, air-proof and electrical insulation properties. On the one hand, the stator body 11 plays a role in fixing the stator core 12 and the stator winding 17. On the other hand, the stator body 11 can reduce the possibility of contact between the stator core 12 and the stator winding 17 and the air and moisture, which is beneficial to prolonging the service life of the stator core 12 and the stator winding 17.

[0177] In some embodiments, the stator assembly 10 of the air conditioner fan motor 100 further includes a pin 16, which is used to connect the stator winding 17 and the power supply. The stator body 11 is injection molded with the pin 16 (such as Figure 15 As shown), stator winding 17, stator core 12 and insulating bracket 131.

[0178] In some embodiments, the stator core 12 and the stator winding 17 can be connected to the stator body 11 during the injection molding process of the stator body 11, that is, the stator body 11 is injection molded to connect the stator core 12 and the stator winding 17, so as to further increase the structural strength of the stator body 11 and reduce the risk of axial movement of the stator winding 17 and the stator core 12 being detached and thrown out during the rotation of the stator body 11; at the same time, the stator body 11 covers the stator core 12 and the stator winding 17 to play a role in waterproofing and insulation.

[0179] Exemplarily, the stator body 11 can be a BMC (bulk molding compound) material part. The bulk molding compound has excellent flow characteristics, insulation, and flame retardancy, which is convenient for processing. The stator body 11 made of BMC also has better insulation and flame retardancy performance.

[0180] Next, an air-conditioning blower motor 100 according to a specific embodiment of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the following description is only an exemplary illustration and should not be construed as a limitation of the present invention.

[0181] As Figures 1 - 17 shown, an air-conditioning blower motor 100 according to a specific embodiment of the present invention includes: a stator assembly 10 and a rotor assembly 20. The stator assembly 10 includes a stator body 11 and a cantilever shaft 15. The stator assembly 10 has a receiving cavity 141. One axial F end of the receiving cavity 141 is a closed end 142, and the other axial F end of the receiving cavity 141 is an open end 143. The cantilever shaft 15 is located in the receiving cavity 141 and one end is fixedly connected to the closed end 142. The closed end 142 is provided with a strengthening structure. The rotor assembly 20 includes a rotor body 26 and a bearing 24. The rotor assembly 20 is installed in the receiving cavity 141 through the open end 143. The cantilever shaft 15 passes through the rotor body 26 and is rotatably matched with the rotor body 26 through the bearing 24. A first connecting portion 235 is formed on an end face of the rotor body 26 facing away from the receiving cavity 141. The first connecting portion 235 is used to connect the fan blade 30.

[0182] The rotor body 26 has a shaft hole 239 for passing through the cantilever shaft 15. A receiving groove 237 is formed on the inner peripheral surface of the shaft hole 239. The bearing 24 is disposed in the receiving groove 237. One axial F end face of the bearing 24 is in limit fit with the groove wall surface of the receiving groove 237. The receiving groove 237 has an opening opposite to the other axial F end face of the bearing 24. The other axial F end face of the bearing 24 is in limit fit with a stopper 151 provided on the cantilever shaft 15. The inner diameter of the shaft hole 239 is larger than the outer diameter of the cantilever shaft 15.

[0183] There are two receiving grooves 237 which are spaced apart along the axial F direction. An elastic gasket 40 is abutted between the groove wall surface of at least one receiving groove 237 and one axial F end face of the bearing 24. There are two bearings 24 which are spaced apart along the axial F direction. The two axial F end faces of the rotor body 26 are respectively a first end face 2310 and a second end face 2311. The first connecting portion 235 is disposed on the second end face 2311. The distance between the bearing 24 close to the first end face 2310 and the first end face 2310 is D1, and the distance between the bearing 24 close to the second end face 2311 and the second end face 2311 is D2. D1 is less than D2.

[0184] The rotor body 26 includes an insulating body 231 and an annular convex portion 232. The annular convex portion 232 is provided at both axial ends F of the insulating body 231. The inner peripheral wall of the annular convex portion 232 and the axial end face F of the insulating body 231 jointly define a receiving groove 237. A reinforcing rib 234 is connected between the outer peripheral wall of the annular convex portion 232 and the axial end face F of the insulating body 231. The annular convex portion 232 and the insulating body 231 are integrally injection-molded. The inner peripheral surface of the bearing 24 is in interference fit with the cantilever shaft 15, and the outer peripheral surface of the bearing 24 is in transitional fit with the rotor body 26.

[0185] The cantilever shaft 15 is provided with a stopper 151. The other end face of the bearing 24 abuts against the stopper 151. The distance L between the stopper 151 close to the closed end 142 and the closed end 142 is greater than zero, so as to reduce the possibility that the stopper 151 transmits the axial F force of the rotor body 26 to the closed end 142. One end face of the rotor assembly 20 in the axial direction F is located outside the receiving cavity 141, and the other end face of the cantilever shaft 15 is located on the side close to the closed end 142 of one end face of the rotor assembly 20 in the axial direction F. In this way, the rotor body 26 is convenient to be connected with the fan blade 30, and the cantilever shaft 15 is not likely to interfere with the installation of the fan blade 30.

[0186] The reinforcing structure includes a reinforcing convex portion 41 and a first reinforcing rib 42 provided on the closed end 142. One end of the cantilever shaft 15 passes through the reinforcing convex portion 41 and is fixedly connected to the reinforcing convex portion 41. The first reinforcing rib 42 is connected between the reinforcing convex portion 41 and the wall surface of the closed end 142. The middle part of the closed end 142 is recessed in the direction away from the open end 143 to form a concave cavity 1422. The reinforcing convex portion 41 is formed on the bottom wall of the concave cavity 1422. A first reinforcing rib 42 is connected between the reinforcing convex portion 41 and the wall surface of the concave cavity 1422. The reinforcing structure includes a second reinforcing rib 43. The second reinforcing rib 43 is located in the receiving cavity 141 and connects the closed end 142 and the circumferential wall surface of the receiving cavity 141. A plurality of first reinforcing ribs 42 and a plurality of second reinforcing ribs 43 are formed on the side wall surface of the closed end 142 facing the receiving cavity 141. The plurality of first reinforcing ribs 42 are arranged at intervals in the circumferential direction, and the plurality of second reinforcing ribs 43 are arranged at intervals in the circumferential direction. The second reinforcing ribs 43 and the first reinforcing ribs 42 are arranged in one-to-one correspondence in the radial direction. Two concave portions 146 are provided on the outer peripheral surface of the end portion of the stator body 11 close to the closed end 142. The concave portions 146 extend along the circumferential direction of the stator body 11. The reinforcing structure includes a third reinforcing rib 44 provided in the concave portion 146. The third reinforcing rib 44 connects the bottom wall and the side wall of the concave portion 146. The third reinforcing ribs 44 of the two concave portions 146 are arranged in one-to-one correspondence in the radial direction. In this way, the fixing effect of the closed end 142 on one end of the cantilever shaft 15 is good, and the installation stability of the cantilever shaft 15 is good.

[0187] One end of the cantilever shaft 15 is injection-molded and connected to the stator body 11. A groove 154 is provided on the circumferential side wall of one end of the cantilever shaft 15. The closed end 142 covers the groove 154, and one end face of the cantilever shaft 15 is exposed outside the outer wall surface 1421 of the closed end. In this way, the connection effect between the cantilever shaft 15 and the stator body 11 is good.

[0188] The air-conditioning blower motor 100 further includes two annular flanges, which are the first annular flange 236 and the second annular flange 144 respectively. The first annular flange 236 is connected to the outer peripheral wall of the rotor body 26, and the second annular flange 144 is connected to the end of the stator body 11 with an open end 143. The second annular flange 144 is arranged around the first annular flange 236. The outer peripheral surface of the first annular flange 236 extends axially in the F direction away from the stator body 11 and inclines inward. In this way, impurities such as water are not easily introduced between the rotor body 26 and the stator body 11, which is beneficial to extending the service life of the air-conditioning blower motor 100.

[0189] The present utility model proposes an inner rotor structure of a cantilever shaft 15 with one end fixed and the other end suspended. The rotor body 26 is installed on the cantilever shaft 15 through a bearing 24 to realize the air-conditioning blower motor 100 with a new inner rotor structure in which the cantilever shaft 15 is fixed and the inner rotor rotates, saving the axial F space of the air-conditioning blower motor 100 and realizing the miniaturization and light-weight design of the air-conditioning blower motor 100.

[0190] As Figure 17 shown, the air-conditioning blower 1000 according to an embodiment of the present utility model includes the air-conditioning blower motor 100 according to an embodiment of the present utility model. Since the air-conditioning blower motor 100 according to an embodiment of the present utility model has the above-mentioned beneficial technical effects, in the air-conditioning blower 1000 according to an embodiment of the present utility model, the cantilever shaft 15 is fixed to the stator body 11, the rotor body 26 is rotatably matched with the cantilever shaft 15 through a bearing 24, and the fan blade 30 is directly installed on the rotor body 26. During operation, the cantilever shaft 15 remains fixed, and the rotor body 26 rotates to drive the fan blade 30 to rotate. The stator assembly 10 does not need to be provided with additional components such as a cover plate for forming a bearing chamber. The cantilever shaft 15 does not need to extend a long distance out of the stator body 11, so that the axial F dimension of the air-conditioning blower motor 100 is shorter and the number of components is less, and the structure is more compact. Furthermore, the volume of the air-conditioning blower motor 100 can be reduced and the structural complexity of the air-conditioning blower motor 100 can be reduced, which is beneficial to the miniaturization and light-weight of the air-conditioning blower motor 100.

[0191] As Figure 18As shown, the air conditioner 2000 according to an embodiment of the present invention includes an air conditioner fan 1000 according to an embodiment of the present invention. Since the air conditioner fan 1000 according to an embodiment of the present invention has the above-mentioned beneficial technical effects, for the air conditioner 2000 according to an embodiment of the present invention, the cantilever shaft 15 is fixed to the stator body 11, the rotor body 26 is rotatably engaged with the cantilever shaft 15 through a bearing 24, and the fan blade 30 is directly mounted on the rotor body 26. During operation, the cantilever shaft 15 remains stationary, and the rotor body 26 rotates to drive the fan blade 30 to rotate. The stator assembly 10 does not need to be provided with additional components such as a cover plate for forming a bearing chamber, and the cantilever shaft 15 does not need to extend a long distance out of the stator body 11, so that the axial dimension F of the air conditioner fan motor 100 is shorter, the number of components is less, and the structure is more compact. Furthermore, the volume of the air conditioner fan motor 100 can be reduced and the structural complexity of the air conditioner fan motor 100 can be reduced, which is beneficial to the miniaturization and lightweight of the air conditioner fan motor 100.

[0192] The other components and operations of the air conditioner fan motor 100, the air conditioner fan 1000, and the air conditioner 2000 according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

[0193] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0194] In the description of this specification, the descriptions referring to terms such as "embodiment", "specific embodiment", "example", etc. mean 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 invention. 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 can be combined in a suitable manner in any one or more embodiments or examples.

[0195] Although the embodiments of the present invention 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 purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air conditioner fan motor, characterized in that: include: A stator assembly, the stator assembly comprising a stator body and a cantilever shaft, the stator assembly having a housing cavity, one axial end of the housing cavity being a closed end, the other axial end of the housing cavity being an open opening, the cantilever shaft being located in the housing cavity and one end of the cantilever shaft being fixedly connected to the closed end, the closed end being provided with a reinforcement structure; A rotor assembly, comprising a rotor body and a bearing, wherein the rotor assembly is mounted in the accommodating cavity through the open opening, the cantilever shaft passes through the rotor body and is rotatably engaged with the rotor body through the bearing, and a first connecting portion is formed on an end surface of the rotor body facing away from the accommodating cavity, wherein the first connecting portion is used to connect to the fan blades.

2. The air conditioner fan motor according to claim 1, characterized in that: The rotor body has an axial hole for penetrating the cantilever shaft, and an accommodating groove is formed on the inner circumferential surface of the axial hole, and the bearing is arranged in the accommodating groove.

3. The air conditioner fan motor according to claim 2, characterized in that: The end face of one axial end of the bearing is limitedly matched with the groove wall of the accommodating groove, and the accommodating groove has an opening opposite to the other axial end face of the bearing, and the other axial end face of the bearing is limitedly matched with a stopper provided on the cantilever shaft.

4. The air conditioner fan motor according to claim 3, characterized in that: The receiving grooves are provided with two and are spaced apart in the axial direction, and an elastic gasket is abutted between the groove wall surface of at least one of the receiving grooves and the axial end surface of the bearing.

5. The air conditioner fan motor according to claim 2, characterized in that: The rotor body includes an insulating body and an annular protrusion, the annular protrusion is arranged at both axial ends of the insulating body, the inner circumferential wall of the annular protrusion and the axial end surface of the insulating body jointly define the accommodating groove, and a reinforcing rib is connected between the outer circumferential wall of the annular protrusion and the axial end surface of the insulating body.

6. The air conditioner fan motor according to claim 5, characterized in that: The annular protrusion and the insulating body are integrally injection-molded.

7. The air conditioner fan motor according to claim 2, characterized in that: The inner diameter of the shaft hole is greater than the outer diameter of the cantilever shaft.

8. The air conditioner fan motor according to claim 1, characterized in that: The bearings are provided with two and are spaced apart in the axial direction. The end faces of the rotor body at both axial ends are respectively a first end face and a second end face. The first connecting portion is provided at the second end face. The distance between the bearing close to the first end face and the first end face is D1, and the distance between the bearing close to the second end face and the second end face is D2, and D1 is smaller than D2.

9. The air conditioner fan motor according to claim 1, characterized in that: The inner circumferential surface of the bearing is interference-fitted with the cantilever shaft, and the outer circumferential surface of the bearing is transitionally-fitted with the rotor body.

10. The air conditioner fan motor according to claim 1, characterized in that: The cantilever shaft is provided with a stopper, the other end surface of the bearing abuts against the stopper, and the distance between the stopper close to the closed end and the closed end is greater than zero.

11. The air conditioner fan motor according to claim 1, characterized in that: An axial end surface of the rotor assembly is located outside the accommodating cavity, and the other end surface of the cantilever shaft is located on a side of the axial end surface of the rotor assembly close to the closed end.

12. The air conditioner fan motor according to claim 1, characterized in that: The reinforcement structure includes a reinforcement protrusion and a first reinforcement rib arranged at the closed end, one end of the cantilever shaft is passed through the reinforcement protrusion and fixedly connected to the reinforcement protrusion, and the first reinforcement rib is connected between the reinforcement protrusion and the closed end wall.

13. The air conditioner fan motor according to claim 12, characterized in that: The middle portion of the closed end is recessed in a direction away from the open mouth to form a cavity, the reinforcing protrusion is formed on the bottom wall of the cavity, and the first reinforcing rib is connected between the reinforcing protrusion and the wall surface of the cavity.

14. The air conditioner fan motor according to claim 1, characterized in that: The reinforcement structure includes a second reinforcement rib, which is located in the accommodating cavity and connects the closed end and the circumferential wall of the accommodating cavity.

15. The air conditioner fan motor according to claim 1, characterized in that: A plurality of first reinforcing ribs and a plurality of second reinforcing ribs are formed on a side wall of the closed end facing the accommodating cavity, the plurality of first reinforcing ribs are arranged spaced apart along the circumferential direction, the plurality of second reinforcing ribs are arranged spaced apart along the circumferential direction, and the second reinforcing ribs and the first reinforcing ribs are arranged one-to-one in the radial direction.

16. The air conditioner fan motor according to claim 1, characterized in that: The outer circumferential surface of the end portion of the stator body close to the closed end is provided with at least one recess, the recess extending along the circumferential direction of the stator body, the reinforcement structure includes a third reinforcement rib provided in the recess, the third reinforcement rib connecting the bottom wall and the side wall of the recess.

17. The air conditioner fan motor according to claim 16, characterized in that: There are a plurality of recesses, and the third reinforcing ribs of adjacent recesses are arranged one by one in the radial direction.

18. The air conditioner fan motor according to claim 1, characterized in that: The stator body is injection-moldedly connected to one end of the cantilever shaft.

19. The air conditioner fan motor according to claim 18, characterized in that: A circumferential side wall of one end of the cantilever shaft is provided with a groove and / or a protrusion, and the closed end covers the groove and / or the protrusion.

20. The air conditioner fan motor according to claim 1, characterized in that: One end surface of the cantilever shaft is exposed on the outer wall surface of the closed end.

21. The air conditioner fan motor according to any one of claims 1 to 20, characterized in that: The rotor body also includes two annular flanges, the two annular flanges are respectively a first annular flange and a second annular flange, the first annular flange is connected to the outer peripheral wall of the rotor body, and the second annular flange is connected to the end of the stator body having the open opening. The first annular flange is arranged around the second annular flange, and the outer peripheral surface of the second annular flange extends axially toward the direction of the stator assembly and inwardly inclined; or, The second annular flange is arranged around the first annular flange, and the outer peripheral surface of the first annular flange extends in an axial direction away from the stator body and in an inwardly inclined manner.

22. An air conditioner fan, characterized in that: Comprising an air conditioning fan motor according to any one of claims 1-21.

23. An air conditioner, characterized in that: Comprising the air conditioning fan according to claim 22.

Images