Outer rotor motor for cross-flow fan

Abstract

The invention discloses an external rotor motor for a cross-flow fan, and the motor comprises an external rotor which is coaxially fixed at the end part of an impeller of the cross-flow fan; the inner stator is partially arranged in the outer rotor and is coaxial with the outer rotor; and the oil-containing sliding bearing is arranged between the rotating shaft of the impeller and the outer rotor and allows the rotating shaft to rotate in the oil-containing sliding bearing. The assembling process of the external rotor motor is simpler, more convenient and faster, vibration and noise are smaller, the manufacturing difficulty and cost of the external rotor motor and the cross-flow fan can be reduced, and the use experience of a user can be improved.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of household electrical appliances. More specifically, the present invention relates to an outer rotor motor for a crossflow fan. Background Art

[0002] As a core component of household appliances, crossflow fans are widely used in air conditioners, air purifiers, heaters and other equipment. Their performance directly affects the overall operating efficiency and user experience of the product. As consumers' requirements for the performance of household appliances continue to increase, higher requirements are also placed on the quietness, reliability and energy efficiency of crossflow fans.

[0003] Among the known cross-flow fans, outer rotor motors are being widely used due to their compact structure and good heat dissipation. However, existing outer rotor motors mostly use rolling bearings as supporting elements between the rotating shaft and the inner stator. Although rolling bearings have certain load-bearing capacity and precision, they have exposed many defects in practical applications. Specifically, rolling bearings have strict requirements on installation accuracy and tightness, which makes their assembly process time-consuming and labor-intensive, and invisibly increases the difficulty and cost of the production process. More importantly, when the rolling bearing is in a high-speed rotation state, the vibration and noise levels it generates are often high, which can easily have an adverse effect on the user experience. Summary of the invention

[0004] In order to solve one or more of the technical problems mentioned above, the present invention provides an outer rotor motor for a cross-flow fan, which has a simpler and faster assembly process and has smaller vibration and noise. It is not only beneficial to reduce the manufacturing difficulty and cost of the cross-flow fan, but also can enhance the user experience.

[0005] According to the present invention, there is provided an outer rotor motor for a crossflow fan, comprising: an outer rotor coaxially fixed to the end of an impeller of the crossflow fan; an inner stator partially disposed inside the outer rotor and coaxial with the outer rotor; and an oil-containing sliding bearing disposed between the rotating shaft of the impeller and the outer rotor and allowing the rotating shaft to rotate therein.

[0006] Furthermore, the outer rotor includes an elastic buffer pad coaxially fixed on the end of the impeller, and a magnetic ring component coaxially fixed on the elastic buffer pad.

[0007] Furthermore, the elastic buffer pad includes a first latching protrusion arranged on one side thereof and embedded in the magnetic ring component, and a second latching protrusion arranged on the other side thereof and embedded in the end of the impeller.

[0008] Further, the cross section of the first clamping protrusion is continuously reduced or stepped along the direction approaching the second clamping protrusion, and the cross section of the second clamping protrusion is continuously reduced or stepped along the direction approaching the first clamping protrusion.

[0009] Furthermore, the elastic buffer pad is made of rubber or silicone, the impeller body of the impeller is made of resin, the magnetic ring component includes a resin substrate and magnetic powder evenly dispersedly buried in the resin substrate, and the impeller, elastic buffer pad and magnetic ring component are multi-component injection molded parts.

[0010] Furthermore, the oil-containing sliding bearing includes: a bearing body, which includes a spherical outer peripheral surface, a circular inner peripheral surface matching and contacting the outer peripheral surface of the rotating shaft and having an oil release port, an oil containing cavity formed between the circular inner peripheral surface and the spherical outer peripheral surface and connected to the oil release port, and grease filled in the oil containing cavity; a buffer ring, which includes a sleeve structure sleeved on the bearing body, and a plurality of elastic ridges arranged on the outer peripheral surface of the sleeve structure at intervals along the axial or circumferential direction and used to abut against the inner stator, wherein the sleeve structure includes a ball socket opened on its inner peripheral surface and used to interference fit with the spherical outer peripheral surface of the bearing body.

[0011] Furthermore, the bearing body is made of resin or metal, and the buffer ring is made of rubber or silicone.

[0012] Furthermore, the outer rotor motor also includes a plurality of elastic adapter blocks arranged between the mounting seat of the crossflow fan and the inner stator and arranged at intervals along the circumference of the inner stator, the plurality of elastic adapter blocks are snapped into the plurality of reserved recesses of the mounting seat one by one and each have a snap-in groove, the inner stator is provided with a plurality of snap-in protrusions arranged at intervals along the circumference and inserted into the corresponding snap-in grooves one by one, wherein the elastic adapter block also has a first material-reducing through hole and a second material-reducing through hole which are symmetrical about the snap-in groove and arranged at intervals along the circumference of the inner stator.

[0013] Furthermore, the outer rotor motor also includes a protective ring fixed on the end of the impeller and coaxial with the impeller, the mounting seat includes a mounting section for mounting the elastic adapter block and a protective section connected to the mounting section and extending toward the impeller, and the protective ring and the protective section of the mounting seat are sleeved around the outer rotor with a gap.

[0014] Furthermore, the inner stator includes a plastic-encapsulated shell partially disposed in the outer rotor, a stator core buried in the plastic-encapsulated shell, and a winding buried in the plastic-encapsulated shell and wound around the stator core. The plastic-encapsulated shell has a central hole for accommodating and clamping the oil-containing sliding bearing.

[0015] The outer rotor motor for the crossflow fan of the present invention uses an oil-containing sliding bearing and replaces the rolling bearing in the prior art as a supporting element between the inner stator and the impeller shaft. Since the oil-containing sliding bearing has greatly reduced requirements for installation accuracy and tightness compared to rolling bearings, the assembly process of the outer rotor motor, especially the oil-containing sliding shaft, is simpler and faster, which is conducive to reducing the manufacturing difficulty and cost of the outer rotor motor, crossflow fan and even household appliances. In addition, the oil-containing sliding bearing relies on grease for lubrication, forming a stable lubricating oil film between it and the shaft, ensuring that the shaft can rotate smoothly and stably with low friction in the oil-containing sliding bearing. This method brings better vibration reduction and noise reduction effects, which can effectively improve the user experience and meet the high standard requirements of modern household appliances for quietness. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0017] Figure 1 A diagram showing the installation state of an outer rotor motor for a crossflow fan according to an embodiment of the present invention;

[0018] Figure 2 An exploded view of an outer rotor motor for a crossflow fan according to an embodiment of the present invention in an installed state is shown;

[0019] Figure 3 Shows Figure 1 A cross-sectional view of the outer rotor motor, impeller and mounting seat shown in the axial direction;

[0020] Figure 4 Shows Figure 1 A perspective view of a bearing body of an outer rotor motor shown;

[0021] Figure 5 Shows Figure 1 A three-dimensional view of a buffer ring of an outer rotor motor shown;

[0022] Figure 6 Shows Figure 1 A cross-sectional view of the outer rotor motor and the impeller in the axial direction is shown;

[0023] Figure 7 Shows Figure 1 A radial cross-sectional view of the outer rotor motor and the mounting seat is shown.

[0024] Explanation of the reference numerals in the accompanying drawings: 100, outer rotor motor; 200, impeller; 2001, rotating shaft; 300, mounting seat; 3001, mounting section; 3002, protective section; 1, outer rotor; 11, magnetic ring component; 12, elastic buffer pad; 121, first latching protrusion; 122, second latching protrusion; 2, inner stator; 21, plastic-sealed shell; 211, snap-fit ​​protrusion; 22, stator core; 23, winding; 3, oil-containing sliding bearing; 31, bearing body; 311, oil release port; 312, oil containing cavity; 32, buffer ring; 321, sleeve structure; 322, elastic ridge; 4, elastic adapter block; 41, snap-fit ​​groove; 42, first material-reducing through hole; 43, second material-reducing through hole; 5, protective ring. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0026] The embodiment of the present invention provides an outer rotor motor 100 for a crossflow fan, see Figure 1 Among them, the crossflow fan, as a core component of household appliances, is widely used in air conditioners, air purifiers, heaters and other equipment, and the outer rotor motor 100 is being widely used in the crossflow fan due to its compact structure and good heat dissipation effect.

[0027] like Figure 2 and Figure 3 As shown, the outer rotor motor 100 comprises an outer rotor 1 coaxially fixed to the end of the impeller 200 of the cross-flow fan, an inner stator 2 partially disposed in the outer rotor 1 and coaxially arranged with the outer rotor 1, and an oil-containing sliding bearing 3 disposed between the rotating shaft 2001 of the impeller 200 and the outer rotor 1 and allowing the rotating shaft 2001 to rotate therein. Among them, the outer rotor 1 at least comprises a magnetic ring component 11 made of a magnetic material or a magnetic composite material, and the magnetic ring component 11 can be directly or indirectly fixed to the impeller 200. When current is passed through the inner stator 2, the inner stator 2 generates a magnetic field, and the outer rotor 1 with the magnetic ring component 11 drives the impeller 200 to rotate in the air duct housing of the cross-flow fan under the action of the magnetic field, thereby realizing the blowing or exhausting function of the cross-flow fan.

[0028] Based on the above description, the outer rotor motor 100 uses an oil-containing sliding bearing 3 and replaces the rolling bearing in the prior art as a supporting element between the inner stator 2 and the rotating shaft 2001 of the impeller 200. Compared with the rolling bearing, the oil-containing sliding bearing 3 has greatly reduced requirements for installation accuracy and tightness, making its assembly process simpler and faster, which is conducive to reducing the manufacturing difficulty and cost of the outer rotor motor 100, the cross-flow fan and even the household appliances using it. In addition, the oil-containing sliding bearing 3 relies on grease for lubrication, and a stable lubricating oil film is formed between it and the rotating shaft 2001, ensuring that the rotating shaft 2001 can rotate smoothly and stably with low friction in the oil-containing sliding bearing 3. This method brings better vibration reduction and noise reduction effects, which can effectively improve the user experience and meet the high standard requirements of modern household appliances for quietness.

[0029] In this embodiment, if Figure 3 and Figure 4 As shown, the oil-containing sliding bearing 3 at least includes a bearing body 31 directly or indirectly disposed between the bearing body 31 and the inner stator 2 and containing grease. The bearing body 31 is made of resin or metal, but it is more recommended to be made of resin with lower cost. When in use, the rotating shaft 2001 rotates in the bearing body 31, and the grease needs to flow into the space between the bearing body 31 and the rotating shaft 2001 through the oil release port 311 formed on the bearing body 31 and form a stable lubricating oil film there, ensuring that the rotating shaft 2001 can rotate smoothly and stably with low friction in the oil-containing sliding bearing 3, and achieve better vibration reduction and noise reduction effects.

[0030] As an example, the oil-containing sliding bearing 3 specifically includes a bearing body 31 sleeved on the rotating shaft 2001, and a buffer ring 32 provided between the bearing body 31 and the inner stator 2. Figure 3 and Figure 4 As shown, the bearing body 31 includes a spherical outer peripheral surface, a circular inner peripheral surface that matches and contacts the outer peripheral surface of the rotating shaft 2001 and has an oil release port 311, an oil containing cavity 312 formed between the circular inner peripheral surface and the spherical outer peripheral surface and connected to the oil release port 311, and lubricating grease (not shown) loaded into the oil containing cavity 312. When in use, the rotating shaft 2001 rotates in the bearing body 31, and the lubricating grease in the oil containing cavity 312 enters between the bearing body 31 and the rotating shaft 2001 through the oil release port 311 and forms a stable lubricating oil film there, ensuring that the rotating shaft 2001 can rotate smoothly, steadily and with low friction in the oil-containing sliding bearing 3. Figure 3 , Figure 4 and Figure 5As shown, the buffer ring 32 includes a sleeve structure 321 sleeved on the bearing body 31, and a plurality of elastic ridges 322 arranged at intervals along the axial or circumferential direction on the outer peripheral surface of the sleeve structure 321 and used to abut the inner stator 2. The buffer ring 32 is made of highly elastic materials such as rubber or silicone. When the buffer ring 32 can absorb and consume the vibration from the bearing body 31 or the inner stator 2 and transmit it to the other party through elastic deformation, this method can not only protect the bearing body 31 and the inner stator 2, but also help reduce their vibration and noise during operation.

[0031] Preferably, the sleeve structure 321 includes a ball socket provided on its inner circumference and used for interference fit with the spherical outer circumference of the bearing body 31. The spherical fit and interference fit between the spherical outer circumference of the bearing body 31 and the ball socket of the buffer ring 32 ensure that the oil-containing sliding bearing 3 has a certain self-adjustment ability while bearing radial loads, that is, it can automatically compensate for assembly errors between the rotating shaft 2001 and the inner stator 2 in aspects such as axial size and coaxiality, which is beneficial to improving the yield rate and production efficiency of the outer rotor motor 100.

[0032] In this embodiment, if Figure 2 and Figure 3 As shown, the inner stator 2 at least includes a stator core 22 and a winding 23 wound on the stator core 22. When in use, the winding 23 can generate a magnetic field required for driving the outer rotor 1 to rotate with the assistance of the stator core 22 after being energized. Preferably, the inner stator 2 also includes a plastic-encapsulated shell 21 that is partially arranged in the outer rotor 1 and embeds the stator core 22 and the winding 23 therein, and the plastic-encapsulated shell 21 has a center hole for accommodating and clamping the oil-containing sliding bearing 3. The application of the plastic-encapsulated shell 21 in the inner stator 2 not only achieves a high degree of integration and sealing, but also effectively isolates the external environment from erosion of the inner stator 2, especially impurities such as water vapor and dust, thereby significantly improving the operating stability and service life of the outer rotor motor 100.

[0033] In this embodiment, in addition to the magnetic ring component 11, the outer rotor 1 may also include an elastic buffer pad 12 coaxially fixed to the end of the impeller 200, so that the magnetic ring component 11 is coaxially fixed to the elastic buffer pad 12 and indirectly fixed to the impeller 200 through the elastic buffer pad 12. The elastic buffer pad 12 is generally made of highly elastic materials such as rubber or silicone to have high elastic properties. The elastic buffer pad 12 is arranged between the impeller 200 and the magnetic ring component 11, which can effectively absorb the vibration generated by the outer rotor motor 100 at the moment of opening and closing and from the magnetic ring component 11, and further reduce the vibration and noise of the outer rotor motor 100.

[0034] like Figure 6As shown, in order to improve the connection strength between the impeller 200 and the elastic buffer pad 12 and the connection strength between the magnetic ring component 11 and the elastic buffer pad 12, the elastic buffer pad 12 includes a first clamping protrusion 121 provided on one side thereof and embedded in the magnetic ring component 11, and a second clamping protrusion 122 provided on the other side thereof and embedded in the end of the impeller 200. Thus, the first clamping protrusion 121 embedded in the magnetic ring component 11 can effectively improve the connection strength and reliability between the magnetic ring component 11 and the elastic buffer pad 12, and the second clamping protrusion 122 embedded in the end of the impeller 200 can also effectively improve the connection strength and reliability between the impeller 200 and the elastic buffer pad 12, thereby ensuring that the outer rotor motor 100 can operate stably and safely.

[0035] Preferably, the cross section of the first clamping protrusion 121 is continuously reduced or stepped along the direction close to the second clamping protrusion 122, and the cross section of the second clamping protrusion 122 is continuously reduced or stepped along the direction close to the first clamping protrusion 121. The cross-sectional reduction design of the first clamping protrusion 121 and the second clamping protrusion 122 can improve the connection strength of the corresponding connection. In addition, the continuous reduction design can also reduce the stress concentration phenomenon at the connection and avoid the occurrence of breaking compared to the step-by-step reduction design.

[0036] More preferably, the magnetic ring component 11 includes a base portion connected to the elastic buffer pad 12 and used to accommodate the first clamping protrusion 121 of the elastic buffer pad 12, and a magnetic ring portion connected to the base portion and sleeved outside the inner stator 2, wherein the radial thickness of the base portion is greater than the radial thickness of the magnetic ring portion. The base portion of the magnetic ring component 11 has a larger radial thickness, which is suitable for accommodating the first clamping protrusion 121 of a larger size, which is conducive to further improving the connection strength between the impeller 200 and the elastic buffer pad 12.

[0037] The connection between the impeller 200 and the elastic buffer pad 12 and the connection between the magnetic ring component 11 and the elastic buffer pad 12 can be selected as bonding, welding or a connection implemented by a multi-component injection molding process. As an example, the magnetic ring component 11 includes a resin substrate (such as polyurethane or polyethylene, etc.) and magnetic powder (such as ferrite, Ru-Fe-Mn and Sm-Fe powder) uniformly dispersed and buried in the resin substrate, and the impeller 200, the elastic buffer pad 12 and the magnetic ring component 11 are multi-component injection moldings. In other words, when the impeller 200, the elastic buffer pad 12 and the magnetic ring component 11 are multi-component injection moldings, the above two connections can be implemented and realized by a multi-component injection molding process, which has a higher connection strength than bonding and welding, and the corresponding snap-in protrusions can also be more conveniently and reliably formed and embedded in the impeller 200 or the magnetic ring component 11.

[0038] In this embodiment, if Figure 7As shown, the outer rotor motor 100 also includes a plurality of elastic transfer blocks 4 arranged between the mounting seat 300 (fixedly connected to the air duct housing or a component of the air duct housing) and the inner stator 2 of the crossflow fan and arranged at intervals along the circumference of the inner stator 2. The plurality of elastic transfer blocks 4 are inserted into the plurality of reserved recesses of the mounting seat 300 one by one and each has a snap-in groove 41. The inner stator 2 is provided with a plurality of snap-in protrusions 211 arranged at intervals in the circumference and inserted into the corresponding snap-in grooves 41 one by one. In other words, the plurality of elastic transfer blocks 4 can be inserted into the mounting seat 300, and the inner stator 2 can be inserted into the plurality of elastic transfer blocks 4, so that the elastic transfer blocks 4 can realize the transfer between the inner stator 2 and the mounting seat 300, and complete the positioning of the inner stator 2 in the crossflow fan. In addition, the elastic adapter block 4 is generally made of highly elastic materials such as rubber or silicone. When the outer rotor motor 100 is opened and closed and causes the inner stator 2 to vibrate, the elastic adapter block 4 is forced to produce elastic deformation and absorb the vibration of the inner stator 2, thereby reducing the degree to which the vibration of the inner stator 2 is transmitted to the air duct housing and other components through the mounting base 300, thereby effectively reducing the vibration and noise generated by the cross-flow fan during use.

[0039] Preferably, the elastic adapter block 4 also has a first material-reducing through hole 42 and a second material-reducing through hole 43 that are symmetrical about the clamping groove 41 and arranged at intervals along the circumference of the inner stator 2. The first material-reducing through hole 42 and the second material-reducing through hole 43 not only have a weight-reducing effect, but also help to improve the elastic deformation ability of the elastic adapter block 4 and absorb more vibrations of the inner stator 2, and further reduce the vibration and noise generated by the cross-flow fan when in use. More preferably, the cross-sections of the first material-reducing through hole 42 and the second material-reducing through hole 43 are both rectangular, and the central axes of the first material-reducing through hole 42 and the second material-reducing through hole 43 are perpendicular to the axial direction of the inner stator 2 and intersect or coincide with the radial direction of the inner stator 2, thereby further improving the vibration absorption capacity of the elastic adapter block 4 and further reducing the vibration and noise generated by the cross-flow fan when in use.

[0040] In this embodiment, if Figure 2 and Figure 3 As shown, the outer rotor motor 100 further includes a protective ring 5 fixedly arranged on the end of the impeller 200 and coaxial with the impeller 200, the mounting seat 300 includes a mounting section 3001 for mounting the elastic adapter block 4 and a protective section 3002 connected to the mounting section 3001 and extending toward the impeller 200, and the protective ring 5 and the protective section 3002 of the mounting seat 300 are sleeved around the outer rotor 1 with a gap. When in use, the sleeved protective ring 5 and the protective section 3002 of the mounting seat 300 can reduce the risk of foreign matter or dust entering between the outer rotor 1 and the inner stator 2, thereby improving the safety and reliability of the outer rotor motor 100 when in use.

[0041] In summary, the assembly process of the outer rotor motor 100 mentioned above is simpler and faster, and has less vibration and noise, which is not only conducive to reducing the manufacturing difficulty and cost of the outer rotor motor 100 and the cross-flow fan, but also can improve the user experience.

[0042] In the above description of the present application, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" and the like should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in the present application, those skilled in the art can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0043] According to the above description of the present application, those skilled in the art may also understand that the terms used below, such as "inner", "outer", "axial", "radial", "circumferential", etc., which indicate orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings of the present application, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0044] In addition, the terms "first" or "second" used in this application to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0045] Although multiple embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art may conceive of many changes, modifications, and alternatives without departing from the thought and spirit of the present invention. It should be understood that in the process of practicing the present invention, various alternatives to the embodiments of the present invention described herein may be adopted. The appended claims are intended to define the scope of protection of the present invention, and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. An outer rotor motor for a crossflow fan, characterized in that: include: An outer rotor coaxially fixed to the end of the impeller of the crossflow fan; An inner stator, part of which is disposed inside the outer rotor and is coaxial with the outer rotor; An oil-containing sliding bearing is provided between the rotating shaft of the impeller and the outer rotor, and allows the rotating shaft to rotate therein.

2. The outer rotor motor according to claim 1, characterized in that: The outer rotor comprises an elastic buffer pad coaxially fixed on the end of the impeller, and a magnetic ring component coaxially fixed on the elastic buffer pad.

3. The outer rotor motor according to claim 2, characterized in that: The elastic buffer pad comprises a first locking protrusion arranged on one side thereof and embedded in the magnetic ring component, and a second locking protrusion arranged on the other side thereof and embedded in the end of the impeller.

4. The outer rotor motor according to claim 3, characterized in that: The cross section of the first clamping protrusion decreases continuously or in steps along a direction approaching the second clamping protrusion, and the cross section of the second clamping protrusion decreases continuously or in steps along a direction approaching the first clamping protrusion.

5. The outer rotor motor according to claim 3, characterized in that: The elastic buffer pad is made of rubber or silicone, the impeller body of the impeller is made of resin, the magnetic ring component includes a resin substrate and magnetic powder uniformly dispersedly buried in the resin substrate, and the impeller, the elastic buffer pad and the magnetic ring component are multi-component injection molded parts.

6. The outer rotor motor according to claim 1, characterized in that: The oil-containing sliding bearing comprises: A bearing body, comprising a spherical outer peripheral surface, a circular inner peripheral surface matching and contacting the outer peripheral surface of the rotating shaft and having an oil release port, an oil containing cavity formed between the circular inner peripheral surface and the spherical outer peripheral surface and communicating with the oil release port, and lubricating grease filled in the oil containing cavity; A buffer ring comprises a sleeve structure sleeved on the bearing body, and a plurality of elastic ridges arranged on the outer circumference of the sleeve structure at intervals along the axial or circumferential direction and used to abut against the inner stator, wherein the sleeve structure comprises a ball socket opened on its inner circumference and used for interference fit with the spherical outer circumference of the bearing body.

7. The outer rotor motor according to claim 6, characterized in that: The bearing body is made of resin or metal, and the buffer ring is made of rubber or silicone.

8. The outer rotor motor according to claim 6, characterized in that: It also includes a plurality of elastic adapter blocks arranged between the mounting seat of the crossflow fan and the inner stator and arranged at intervals along the circumference of the inner stator. The plurality of elastic adapter blocks are snapped into the plurality of reserved recesses of the mounting seat one by one and each have a snap-in groove. The inner stator is provided with a plurality of snap-in protrusions arranged at intervals along the circumference and inserted into the corresponding snap-in grooves one by one. The elastic adapter block also has a first material-reducing through hole and a second material-reducing through hole which are symmetrical about the snap-in groove and arranged at intervals along the circumference of the inner stator.

9. The outer rotor motor according to claim 8, characterized in that: It also includes a protective ring fixed on the end of the impeller and coaxial with the impeller, the mounting seat includes a mounting section for mounting the elastic adapter block and a protective section connected to the mounting section and extending toward the impeller, the protective ring and the protective section of the mounting seat are sleeved around the outer rotor with a gap.

10. The outer rotor motor according to claim 1, characterized in that: The inner stator comprises a plastic-encapsulated shell partly arranged in the outer rotor, a stator core buried in the plastic-encapsulated shell and a winding buried in the plastic-encapsulated shell and wound around the stator core. The plastic-encapsulated shell has a central hole for accommodating and clamping the oil-containing sliding bearing.

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