Outer rotor motor, cross-flow fan and air conditioner

Abstract

The utility model discloses an external rotor motor, cross-flow fan and air conditioner, the external rotor motor comprises: a motor body and a motor cover, the motor body comprises a rotor and a stator, the rotor comprises a rotor ring, the stator comprises a stator body, the stator body extends into the rotor ring, and the motor cover is arranged on the rotor ring. Two axial sides of the motor body are respectively a first side and a second side; the stator is fixedly installed on the motor cover, the motor cover comprises an annular ring and a cover end cover, the annular ring surrounds the motor body in the circumferential direction of the motor body, and the cover end cover is arranged on the first side of the motor body and covers a shaft side opening of the annular ring. And the cover end cover and the annular ring are clamped and matched through the clamping structure and are fixedly connected through a fastener, so that the motor cover is simple in structure and convenient to process, and the assembly efficiency and the reliability of the motor cover can be considered at the same time.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning, and in particular to an external rotor motor, a cross-flow fan, and an air conditioner. Background Technology

[0002] Some external rotor motors in related technologies use motor covers for installation. However, the structure of the motor cover is relatively complex, and the processing and assembly are also relatively complicated, and the structural reliability is relatively weak. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an external rotor motor with a simple motor cover structure, easy processing, and which balances assembly efficiency and reliability.

[0004] An external rotor motor according to an embodiment of the present invention includes: a motor body and a motor cover. The motor body includes a rotor and a stator. The rotor includes a rotor ring, and the stator includes a stator body that extends into the rotor ring. The axial sides of the motor body are a first side and a second side, respectively. The stator is fixedly mounted on the motor cover. The motor cover includes an annular ring and a cover end cap. The annular ring surrounds the motor body circumferentially. The cover end cap is located on the first side of the motor body and covers the axial opening of the annular ring. The cover end cap and the annular ring are engaged by a snap-fit ​​structure and fixedly connected by fasteners.

[0005] According to the embodiment of the present invention, the external rotor motor includes an annular ring and a cover end cap. The motor cover has a simple structure and is easy to process. By setting the cover end cap and the annular ring to be engaged by a snap-fit ​​structure and fixedly connected by fasteners, the assembly efficiency and reliability of the motor cover can be taken into account. This allows the stator to be stably fixed inside the motor cover, so as to avoid the stator from shifting and to ensure that the stator and rotor have good concentricity, thereby improving the overall performance of the external rotor motor.

[0006] In some embodiments, the snap-fit ​​structure includes a first snap-fit ​​portion disposed on the annular ring and a second snap-fit ​​portion disposed on the end cap, wherein one of the first snap-fit ​​portion and the second snap-fit ​​portion is a snap-fit ​​protrusion and the other is a snap-fit ​​groove, and the snap-fit ​​protrusion engages with the snap-fit ​​groove.

[0007] In some embodiments, the end cap is embedded in the annular ring, the snap-fit ​​groove penetrates the peripheral wall of the annular ring along the radial direction of the stator, and the snap-fit ​​protrusion protrudes from the outer peripheral edge of the end cap toward the center away from the end cap.

[0008] In some embodiments, the annular ring includes an arc segment and a clearance segment continuously arranged along the circumference of the stator. In the axial projection of the external rotor motor, the outer contour of the arc segment is a superior arc, and the outer contour of the clearance segment is located within the range enclosed by the base circle line where the outer contour of the arc segment is located, and a clearance area is left between the arc segment and the base circle line. The first snap-fit ​​portion is provided on the clearance segment.

[0009] In some embodiments, the avoidance section includes a plurality of straight edge segments arranged sequentially along the circumference of the stator. In the axial projection of the external rotor motor, the outer contour of the straight edge segment extends along the chord of the base circle line, the included angle between the outer contours of two adjacent straight edge segments is an obtuse angle, and each straight edge segment is provided with the first snap-fit ​​portion.

[0010] In some embodiments, the fastener is located at the arc segment.

[0011] In some embodiments, the annular ring has a first connecting portion, the end cap has a second connecting portion, the second connecting portion overlaps the first side of the first connecting portion along the axial direction of the motor body, and the fastener is a threaded fastener that passes through the second connecting portion and is threadedly connected to the first connecting portion.

[0012] In some embodiments, the stator includes a limiting protrusion disposed at one end of the stator body near the end cap and protruding from the outer peripheral surface of the stator body. A limiting groove is formed inside the annular ring. The limiting groove is open on the side of the stator facing the end cap along the axial direction to form a slot, and a bottom wall is formed on the side away from the end cap. A vibration damping sleeve is provided outside the limiting protrusion. The vibration damping sleeve at least covers the two axial end faces of the limiting protrusion. The limiting protrusion and the vibration damping sleeve together extend from the slot into the limiting groove along the axial direction of the stator and are clamped between the end cap and the bottom wall of the groove along the axial direction of the stator.

[0013] In some embodiments, the damping sleeve has a protrusion extending in a direction away from the end cap, and the end cap has a groove formed at a position corresponding to the protrusion, the protrusion extending into the groove along the axial direction of the stator.

[0014] In some embodiments, there are multiple limiting protrusions that are spaced apart circumferentially along the stator, and there are multiple limiting grooves that correspond one-to-one with the multiple limiting protrusions. The damping sleeve also covers the radial outer surface and the two circumferential sides of the limiting protrusions.

[0015] This utility model also proposes a cross-flow fan.

[0016] The cross-flow fan according to an embodiment of the present utility model includes a cross-flow impeller and an external rotor motor according to any of the above embodiments. The external rotor motor is disposed at one axial end of the cross-flow impeller, and the rotor ring is coaxially arranged and fixedly connected to the cross-flow impeller.

[0017] According to the embodiments of the present invention, the stator and rotor of the cross-flow fan have good concentricity, which improves the overall performance of the external rotor motor and helps to improve the reliability of the cross-flow fan.

[0018] This utility model proposes another type of air conditioner.

[0019] An air conditioner according to an embodiment of the present invention includes: an air conditioner body and a cross-flow fan according to any of the above embodiments, wherein the external rotor motor is fixedly installed on the air conditioner body through the motor cover.

[0020] According to the embodiments of the present invention, the stator and rotor of the air conditioner have good concentricity, which improves the overall performance of the external rotor motor, helps to improve the reliability of the cross-flow fan, and enhances the product competitiveness of the air conditioner.

[0021] In some embodiments, the annular ring includes an arc segment and a clearance segment continuously arranged circumferentially along the stator. In the axial projection of the external rotor motor, the outer contour of the arc segment is a superior arc, and the outer contour of the clearance segment is located within the range enclosed by the base circle line where the outer contour of the arc segment is located, and a clearance area is left between the clearance segment and the base circle line. The air conditioner is a wall-mounted air conditioner, the air conditioner body includes a chassis, the axis of the cross-flow fan is in the left-right direction, the motor cover is mounted on the chassis, the clearance segment is located on the rear side of the motor cover, the chassis includes a chassis back plate located on the rear side of the cross-flow fan, the chassis back plate is recessed into the clearance area at the location corresponding to the clearance segment to define a clearance space that intrudes forward into the front side of the rear surface of the chassis back plate, and a refrigerant pipe passes through the clearance space.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is a cross-sectional view of a cross-flow fan according to some embodiments of the present invention;

[0025] Figure 2 This is a schematic diagram of an external rotor motor according to some embodiments of the present invention;

[0026] Figure 3 This is an exploded view of an external rotor motor according to some embodiments of the present invention;

[0027] Figure 4 This is a schematic diagram of the end cap according to some embodiments of the present utility model;

[0028] Figure 5 This is an isometric view of the annular ring according to some embodiments of the present invention;

[0029] Figure 6 This is a front view of an annular ring according to some embodiments of the present invention;

[0030] Figure 7 This is a partial schematic diagram of an air conditioner according to some embodiments of the present utility model;

[0031] Figure 8 This is a partial exploded view of an air conditioner according to some embodiments of the present invention;

[0032] Figure 9 This is a cross-sectional schematic diagram of the chassis according to some embodiments of the present utility model.

[0033] Figure label:

[0034] Air conditioner 1000;

[0035] Cross-flow fan 100; Air conditioner body 200; Chassis 201; Chassis back panel 2011; Space clearance 2012; Cover 300;

[0036] External rotor motor 1; Motor body 10;

[0037] Rotor 11; Rotor ring 111; Shaft 112;

[0038] Stator 12; Stator body 121; Mounting part 122; Limiting protrusion 1221; Shaft hole 123; Sliding bearing 124;

[0039] Motor cover 13; Annular ring 131; Arc segment 1311; Clearance segment 1312; Straight edge segment 13121; Snap-fit ​​groove 1313; First connecting part 1314; Limiting groove 1315; Mounting ear 1316; Base circle line C1; Clearance area C2;

[0040] Cover end cap 132; snap-fit ​​protrusion 1321; second connecting part 1322; groove 1323;

[0041] Threaded fastener 14; Vibration damping sleeve 15; Protrusion 151; Snap-fit ​​structure 16; Fastener 17;

[0042] Cross-flow wind turbine 2. Detailed Implementation

[0043] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0044] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0046] Hereinafter, with reference to the accompanying drawings, an external rotor motor 1 according to an embodiment of the present invention will be described.

[0047] like Figures 1-9 As shown, the external rotor motor 1 according to an embodiment of the present invention includes: a motor body 10 and a motor cover 13. The motor body 10 includes a rotor 11 and a stator 12. The rotor 11 includes a rotor ring 111, and the stator 12 includes a stator body 121. The stator body 121 extends into the rotor ring 111. The two sides of the axial direction F of the motor body 10 are respectively the first side F1 and the second side F2. The stator 12 is fixedly installed on the motor cover 13. The motor cover 13 includes an annular ring 131 and a cover end cap 132. The annular ring 131 surrounds the motor body 10 circumferentially. The cover end cap 132 is located on the first side F1 of the motor body 10 and covers the axial opening of the annular ring 131. The cover end cap 132 and the annular ring 131 are engaged by a snap-fit ​​structure 16 and fixedly connected by fasteners 17.

[0048] According to the embodiment of the present invention, the external rotor motor 1 includes a motor cover 13 comprising an annular ring 131 and a cover end cap 132. The motor cover 13 has a simple structure and is easy to process. By setting the cover end cap 132 and the annular ring 131 to be engaged by a snap-fit ​​structure 16 and fixedly connected by fasteners 17, the assembly efficiency and reliability of the motor cover 13 can be taken into account. This allows the stator 12 to be stably fixed inside the motor cover 13, preventing the stator 12 from shifting. This helps to ensure that the stator 12 and the rotor 11 have good concentricity, thus improving the overall performance of the external rotor motor 1.

[0049] For example, refer to Figures 1-3 As shown, the external rotor motor 1 includes a rotor 11, a stator 12, and a motor housing 13. The rotor 11 includes a rotor ring 111, and the stator 12 includes a stator body 121 and a mounting portion 122. The stator body 121 extends into the rotor ring 111, thereby eliminating the axial fitting clearance between the rotor 11 and the stator 12, improving the fit compactness, and facilitating a reduction in the axial dimensions of the external rotor motor 1, thus saving space.

[0050] The stator 12 has a central shaft hole 123, within which a sliding bearing 124 is disposed. The rotor 11 includes a rotating shaft 112 disposed within a rotor ring 111. The rotating shaft 112 is fixedly connected to the rotor ring 111 (e.g., directly or indirectly). The rotating shaft 112 passes through the sliding bearing 124 and is rotatably engaged with the stator body 121 via the sliding bearing 124. This allows for relative rotation between the rotor 11 and the stator 12, reducing assembly difficulty and improving assembly efficiency. The rotor ring 111 can be an annular magnetic ring, and the stator body 121 can include a stator core and stator windings.

[0051] The mounting portion 122 is located axially outside the rotor ring 111 and is connected to the shaft end of the stator body 121. The motor cover 13 includes an annular ring 131 and a cover end cap 132. The annular ring 131 surrounds the mounting portion 122 circumferentially around the stator 12 and has an axially open opening. The cover end cap 132 is located on the side of the mounting portion 122 away from the center of the stator body 121 and covers the axially open opening of the annular ring 131. The cover end cap 132 and the annular ring 131 are engaged by a snap-fit ​​structure 16 and fixedly connected by fasteners 17 to fix the mounting portion 122 inside the motor cover 13. Thus, the motor cover 13 has a simple structure, is easy to manufacture, and is easy to assemble with the motor body 10. Moreover, the assembly of the motor cover 13 itself is simple and quick, and the structure after connection is reliable and stable.

[0052] For example, in the specific installation process, the annular ring 131 can be first fitted onto the outside of the mounting part 122, and then the end cover 132 can be installed on the side of the mounting part 122 away from the center of the stator body 121. The end cover 132 can be engaged with the annular ring 131 through the snap-fit ​​structure 16 to achieve the positioning of the end cover 132 and the annular ring 131. At this time, the end cover 132 and the annular ring 131 can be fixedly connected together by the fastener 17. The mounting part 122 can be clamped between the annular ring 131 and the end cover 132 to achieve the fixed installation of the stator 12 and the motor cover 13. Finally, the stator 12 can be engaged with the rotor 11 to complete the assembly of the external rotor motor 1.

[0053] Understandably, the end cover 132 and the annular ring 131 are engaged by the snap-fit ​​structure 16 and fixedly connected by the fastener 17, which can stably fix the stator 12 inside the motor cover 13, prevent the stator 12 from shifting, and help ensure that the stator 12 and the rotor 11 have good concentricity.

[0054] In addition, the end cap 132 and the annular ring 131 are engaged by the snap-fit ​​structure 16 and fixedly connected by the fastener 17. Compared with the method of fixing only by the snap-fit ​​structure 16, the structure of the motor cover 13 is more reliable, less prone to loosening, and less likely to produce abnormal resonance sounds. Moreover, compared with the method of fixing only by the fastener 17, the number of fasteners 17 can be reduced, which helps to reduce the assembly difficulty of the motor cover 13 and improve the assembly efficiency.

[0055] In some embodiments of this utility model, the snap-fit ​​structure 16 includes a first snap-fit ​​portion disposed on the annular ring 131 and a second snap-fit ​​portion disposed on the end cap 132. One of the first snap-fit ​​portion and the second snap-fit ​​portion is a snap-fit ​​protrusion 1321 and the other is a snap-fit ​​groove 1313. The snap-fit ​​protrusion 1321 and the snap-fit ​​groove 1313 engage in snap-fit ​​cooperation.

[0056] For example, refer to Figures 2-5 As shown, the snap-fit ​​structure 16 includes a first snap-fit ​​part and a second snap-fit ​​part. The first snap-fit ​​part is disposed on the annular ring 131, and the second snap-fit ​​part is disposed on the end cap 132. The end cap 132 can be snapped and connected to the first snap-fit ​​part of the annular ring 131 through the second snap-fit ​​part, so as to snap and fix the end cap 132 on the annular ring 131.

[0057] In this configuration, one of the first and second snap-fit ​​portions can be configured as a snap-fit ​​protrusion 1321 and the other as a snap-fit ​​groove 1313. The snap-fit ​​protrusion 1321 and the snap-fit ​​groove 1313 engage to connect the end cap 132 to the annular ring 131. For example, the first snap-fit ​​portion can be configured as a snap-fit ​​protrusion 1321 and the second snap-fit ​​portion as a snap-fit ​​groove 1313; or, the second snap-fit ​​portion can be configured as a snap-fit ​​protrusion 1321 and the first snap-fit ​​portion as a snap-fit ​​groove 1313.

[0058] The above-described design reduces the installation difficulty between the annular ring 131 and the end cap 132, simplifies the structure of the motor cover 13, and reduces its processing cost. Of course, this application is not limited to this. For example, both can be machined as snap-fit ​​protrusions, with transition pieces having snap-fit ​​grooves to snap-fit ​​with each other; or both can be machined as snap-fit ​​grooves, with transition pieces having snap-fit ​​protrusions to snap-fit ​​with each other, etc., which will not be elaborated here.

[0059] In some embodiments of this utility model, such as Figures 3-5 As shown, the end cap 132 can be configured to be embedded in the annular ring 131. In this case, the first snap-fit ​​portion on the annular ring 131 can be constructed as a snap-fit ​​groove 1313, which penetrates the peripheral wall of the annular ring 131 along the radial direction of the stator 12. The second snap-fit ​​portion on the end cap 132 can be constructed as a snap-fit ​​protrusion 1321, which protrudes from the outer peripheral edge of the end cap 132 toward a direction away from the center of the end cap 132. The snap-fit ​​protrusion 1321 is used to pass through the snap-fit ​​groove 1313 to realize the snap-fit ​​engagement between the end cap 132 and the annular ring 131.

[0060] The above-mentioned design makes it easy to process and fit the snap-fit ​​groove 1313 and the snap-fit ​​protrusion 1321, and simplifies the structure of the motor cover 13, improves the axial structural compactness of the motor cover 13, and enhances the design rationality of the motor cover 13.

[0061] In some embodiments of this utility model, such as Figures 5-6 As shown, the annular ring 131 includes an arc segment 1311 and a clearance segment 1312, which are continuously arranged along the circumference of the stator 12. In the axial projection of the external rotor motor 1, the outer contour of the arc segment 1311 is a superior arc, and the outer contour of the clearance segment 1312 is located within the range enclosed by the base circle line C1 where the outer contour of the arc segment 1311 is located. A clearance area C2 is left between the clearance segment 1312 and the base circle line C1, and the first snap-fit ​​part is provided on the clearance segment 1312.

[0062] It should be noted that the arc segment 1311 is the continuously arranged arc-shaped portion along the circumference of the annular ring 131, forming the basic outline of the annular ring 131; the outer outline of the clearance segment 1312 is located inside the base circle line C1 where the arc segment 1311 is located, meaning that relative to the entire base circle line C1, the clearance segment 1312 is recessed inward towards the center of the base circle line C1 to form a clearance area C2. The first snap-fit ​​part is provided on the clearance segment 1312 to face the clearance area C2, so that the clearance area C2 can accommodate the snap-fit ​​structure 16. Of course, the clearance area C2 can also be used to accommodate other components and structures, for example, to form a clearance for the arrangement of refrigerant pipes.

[0063] Understandably, by setting the clearance section 1312 and placing the first snap-fit ​​part within the clearance section 1312, the clearance section 1312 provides space for the snap-fit ​​structure 16, helping to prevent interference between the snap-fit ​​structure 16 and other components or structures. It also allows for a more compact structure of the external rotor motor 1, improving the design rationality of the external rotor motor 1. Furthermore, the clearance section 1312 makes it easier to position the annular ring 131 and the end cap 132 during assembly, thus improving assembly efficiency.

[0064] The outer contour shape of the avoidance section 1312 is not limited to the chord shape shown in the figure. For example, the shape of the avoidance section 1312 can be a curve. The size and position of the avoidance section 1312 are also not limited to the situation shown in the figure. They should be designed according to the size of the avoidance space and the stress situation of the annular ring 131.

[0065] In some embodiments of this utility model, such as Figures 5-6 As shown, the clearance section 1312 includes a plurality of straight edge sections 13121 arranged sequentially along the circumference of the stator 12. In the axial projection of the outer rotor motor 1, the outer contour of the straight edge section 13121 extends along the chord of the base circle line C1, and the included angle α between the outer contours of two adjacent straight edge sections 13121 is an obtuse angle. Each straight edge section 13121 is provided with a first locking part, and the cover end cap 132 is provided with a plurality of second locking parts, and the plurality of first locking parts and the plurality of second locking parts are matched one-to-one.

[0066] Understandably, the straight edge segment 13121 has lower processing costs and easier-to-control processing accuracy compared to complex curved edges, which helps to improve production efficiency and reduce costs. Multiple straight edge segments 13121 are arranged in sequence to form a clearance segment 1312, which allows the clearance segment 1312 to adapt to more complex interference situations and provide more flexible clearance space for other components or structures. Multiple straight edge segments 13121 and arc segments 1311 together form an annular ring 131. The stress path can be optimized and the overall strength of the structure can be improved by adjusting the number and size of the straight edge segments 13121. Each straight edge segment 13121 is provided with a first snap-fit ​​part, which can improve the limiting effect of the snap-fit ​​structure and improve the connection stability between the cover end cap 132 and the annular ring 131.

[0067] In some embodiments of this utility model, such as Figures 2-5 As shown, the annular ring 131 has a first connecting portion 1314, and the end cover 132 has a second connecting portion 1322. The second connecting portion 1322 overlaps the first side F1 of the first connecting portion 1314 along the axial direction F of the motor body 10. The fastener 17 is a threaded fastener 14. The threaded fastener 14 passes through the second connecting portion 1322 and is threadedly connected to the first connecting portion 1314 to fix the end cover 132 on the annular ring 131.

[0068] The above-described configuration improves the connection stability between the annular ring 131 and the end cover 132, enhances the reliability of the motor cover 13, and facilitates easy disassembly and assembly of the annular ring 131 and the end cover 132 for subsequent maintenance. Of course, this application is not limited to this; for example, bolts and nuts, rivets, etc., can also be used as fasteners 17.

[0069] In some embodiments of this utility model, when the first snap-fit ​​portion is located at the clearance section 1312, the fastener 17 can be located at the arc section 1311. Through this arrangement, the snap-fit ​​structure 16 and the fastener 17 can fix the annular ring 131 and the end cap 132 at different positions in the circumference, which helps to improve the connection stability between the annular ring 131 and the end cap 132 throughout the entire circumference.

[0070] In some embodiments of this utility model, the stator 12 includes a limiting protrusion 1221. The limiting protrusion 1221 is disposed at one end of the stator body 121 near the end cap 132 and protrudes from the outer peripheral surface of the stator body 121. A limiting groove 1315 is formed inside the annular ring 131. The limiting groove 1315 is open on the side of the stator 12 facing the end cap 132 in the axial direction to form a groove opening, and a groove bottom wall is formed on the side away from the end cap 132. A vibration damping sleeve 15 is provided outside the limiting protrusion 1221. The vibration damping sleeve 15 at least covers the two axial end faces of the limiting protrusion 1221. The limiting protrusion 1221 and the vibration damping sleeve 15 extend from the groove opening into the limiting groove 1315 along the axial direction of the stator 12, and are clamped between the end cap 132 and the groove bottom wall along the axial direction of the stator 12.

[0071] For example, refer to Figures 1-5 As shown, the mounting part 122 includes a plurality of limiting protrusions 1221. The limiting protrusions 1221 are located at one end of the stator body 121 near the end cover 132. The limiting protrusions 1221 protrude from the outer peripheral surface of the stator body 121. A limiting groove 1315 is formed inside the annular ring 131. In the axial direction of the stator 12, the side of the limiting groove 1315 facing the end cover 132 is open to form a groove opening, and the side of the limiting groove 1315 away from the end cover 132 forms a groove bottom wall.

[0072] A damping sleeve 15 is provided outside the limiting protrusion 1221. The damping sleeve 15 can be made of elastic materials such as silicone rubber. The damping sleeve 15 at least covers the two end faces of the limiting protrusion 1221 in the axial direction of the stator 12. The limiting groove 1315 is matched with the damping sleeve 15. The limiting protrusion 1221, together with the damping sleeve 15, can extend from the groove opening into the limiting groove 1315 along the axial direction of the stator 12. The limiting protrusion 1221 can be limited and engaged with the bottom wall of the groove along the axial direction of the stator 12. The end cap 132 can be connected to the annular ring 131 and limited and engaged with the limiting protrusion 1221 along the axial direction of the stator 12 to clamp the limiting protrusion 1221 between the end cap 132 and the bottom wall of the groove. The damping sleeve 15 is used to separate the limiting protrusion 1221 from the end cap 132 and the bottom wall of the groove.

[0073] Understandably, by clamping the limiting protrusion 1221 of the stator 12 between the end cover 132 and the bottom wall of the slot, the stator 12 can be restricted from moving relative to the motor cover 13, which helps to ensure the installation stability of the stator 12 and the motor cover 13, thereby improving the operating stability of the external rotor motor 1. In addition, by wrapping the damping sleeve 15 around the axial end faces of the limiting protrusion 1221, the damping sleeve 15 can separate the limiting protrusion 1221 from the end cover 132 and the bottom wall of the slot, which can prevent the limiting protrusion 1221 from directly colliding with the end cover 132 and the bottom wall of the slot. The damping sleeve 15 can also be used to eliminate the mating clearance, thereby improving the installation stability of the stator 12.

[0074] In some embodiments of this utility model, such as Figures 3-4 As shown, the damping sleeve 15 has a protrusion 151 extending in a direction away from the end cover 132. The end cover 132 has a groove 1323 formed at the position corresponding to the protrusion 151. The protrusion 151 extends into the groove 1323 along the axial direction of the stator 12 and is matched with the end cover 132 for limiting engagement. This improves the installation stability of the end cover 132 in the axial direction of the stator 12, which is beneficial to improving the reliability of the external rotor motor 1.

[0075] In some embodiments of this utility model, such as Figure 3 As shown, multiple limiting protrusions 1221 can be provided, and these multiple limiting protrusions 1221 are spaced apart along the circumference of the stator 12. Multiple limiting grooves 1315 can also be provided, with each limiting groove 1315 corresponding to one of the multiple limiting protrusions 1221. The multiple limiting protrusions 1221 are used to extend into their respective limiting grooves 1315 to engage with the annular ring 131. The damping sleeve 15 also covers the radial outer surface and circumferential sides of the limiting protrusions 1221. The damping sleeve 15 can be used to separate the limiting protrusions 1221 from the circumferential and radial sidewalls of the limiting grooves 1315.

[0076] With the above configuration, multiple limiting protrusions 1221 can limit the stator 12 from different circumferential positions to restrict the stator 12 from moving relative to the motor cover 13 in the axial, radial or circumferential direction, thereby improving the installation stability of the stator 12 and dispersing the force between the stator 12 and the motor cover 13, avoiding structural damage caused by excessive local force, thus enhancing structural stability and improving the reliability of the external rotor motor 1.

[0077] In addition, by setting the vibration damping sleeve 15 as a buffer, the vibration energy between the limiting protrusion 1221 and the motor cover 13 can be effectively absorbed, thereby reducing the noise and vibration during mechanical operation. On the other hand, the vibration damping sleeve 15 can reduce the direct friction and collision between the limiting protrusion 1221 and the motor cover 13, extend the service life of both, and avoid structural damage or wear caused by long-term vibration. Furthermore, by selecting vibration damping sleeves 15 of different materials or thicknesses, the vibration damping effect can be adjusted to meet the vibration and noise control requirements under different working conditions. Moreover, the vibration damping sleeve 15 can produce elastic deformation, and the stator 12 can generate a small displacement by squeezing the vibration damping sleeve 15. The stator 12 can adaptively adjust its position relative to the motor cover 13 to improve the coaxiality of the rotor 11 and the stator 12. Of course, this utility model is not limited to this. For example, in other embodiments of this utility model, the vibration damping sleeve 15 can be omitted, and the limiting protrusion 1221 and the motor cover 13 can directly abut against each other.

[0078] This utility model also proposes a cross-flow fan 100.

[0079] like Figure 1 As shown, the cross-flow fan 100 according to an embodiment of the present utility model includes a cross-flow impeller 2 and an external rotor motor 1 according to any of the above embodiments. The external rotor motor 1 is located at one axial end of the cross-flow impeller 2. The rotor ring 111 is coaxially arranged and fixedly connected to the cross-flow impeller 2. The stator 12 can drive the cross-flow impeller 2 to rotate by driving the rotor 11 to rotate.

[0080] According to the embodiments of the present invention, the stator 12 and rotor 11 of the cross-flow fan 100 have good concentricity, which improves the overall performance of the external rotor motor 1 and helps to improve the reliability of the cross-flow fan 100.

[0081] This utility model also proposes an air conditioner 1000.

[0082] like Figures 7-8 As shown, the air conditioner 1000 according to an embodiment of the present utility model includes: an air conditioner body 200 and a cross-flow fan 100 according to any of the above embodiments, wherein an external rotor motor 1 is fixedly installed on the air conditioner body 200 through a motor cover 13.

[0083] According to the embodiment of the present invention, the stator 12 and rotor 11 of the air conditioner 1000 have good concentricity, which improves the overall performance of the external rotor motor 1, helps to improve the reliability of the cross-flow fan 100, and enhances the product competitiveness of the air conditioner 1000.

[0084] In some embodiments of this utility model, the annular ring 131 includes an arc segment 1311 and a clearance segment 1312 continuously arranged along the circumference of the stator 12. In the axial projection of the external rotor motor 1, the outer contour of the arc segment 1311 is a superior arc, and the outer contour of the clearance segment 1312 is located within the range defined by the base circle line C1 where the outer contour of the arc segment 1311 is located, and a clearance area C2 is left between the clearance segment 1312 and the base circle line C1; the air conditioner 1000 is a wall-mounted air conditioner, and the air conditioner body 20 The device includes a chassis 201, with the axis of the cross-flow fan 2 pointing left and right. The motor cover 13 is mounted on the chassis 201, and the clearance section 1312 is located on the rear side of the motor cover 13. The chassis 201 includes a chassis back plate 2011 located on the rear side of the fan. The chassis back plate 2011 is recessed into the clearance area C2 at the corresponding clearance section 1312 to define a clearance space 2012 that intrudes forward into the front side of the rear surface of the chassis back plate 2011. A refrigerant pipe passes through the clearance space 2012.

[0085] For example, refer to Figures 6-9As shown, the annular ring 131 includes an arc segment 1311 and a clearance segment 1312 continuously arranged along the circumference of the stator 12. In the axial projection of the external rotor motor 1, the outer contour of the arc segment 1311 is a superior arc, and the outer contour of the clearance segment 1312 is located within the range enclosed by the base circle line C1 where the outer contour of the arc segment 1311 is located. Furthermore, a clearance area C2 is left between the outer contour of the clearance segment 1312 and the base circle line C1.

[0086] It should be noted that the arc segment 1311 is the arc-shaped part continuously arranged along the circumference of the ring 131, forming the basic outline of the ring 131; the outer outline of the avoidance segment 1312 is located inside the base circle line C1 where the arc segment 1311 is located, which means that relative to the entire base circle line C1, the avoidance segment 1312 is recessed inward towards the center of the base circle line C1 to form the clearance area C2.

[0087] The air conditioner 1000 is a wall-mounted air conditioner. The air conditioner body 200 includes a chassis 201. The axis of the cross-flow fan 2 and the axis of the external rotor motor 1 are both in the left-right direction. The motor cover 13 is installed on the chassis 201. The clearance section 1312 is located on the rear side of the motor cover 13. The chassis 201 includes a chassis back plate 2011. The chassis back plate 2011 is located on the rear side of the cross-flow fan 100. The chassis back plate 2011 is recessed into the clearance area C2 at the corresponding clearance section 1312 to define a clearance space 2012 on the rear side of the chassis back plate 2011. The clearance space 2012 intrudes forward into the front side of the rear surface of the chassis back plate 2011. The clearance space 2012 is used for the passage of refrigerant pipes.

[0088] With the above configuration, the chassis back plate 2011 can provide clearance 2012 for the refrigerant pipe to pass through, which can prevent the refrigerant pipe from protruding from the rear surface of the chassis back plate 2011. This allows the chassis back plate 2011 of the chassis 201 to be installed close to the wall, reducing the size of the air conditioner 1000 in the front-rear direction. Furthermore, the refrigerant pipe does not occupy the outer space of the cross-flow fan 100 in the axial direction, thereby reducing the size of the air conditioner 1000 in the axial direction (i.e., the left-right direction), which is conducive to the miniaturization design of the air conditioner 1000.

[0089] In some embodiments of this utility model, such as Figure 5 as well as Figures 7-8 As shown, the air conditioner 1000 also includes a pressure cap 300. A mounting ear 1316 protrudes from the outer wall of the annular ring 131. The chassis 201 has mounting holes. The pressure cap 300 is used to press onto the side of the motor cover 13 facing away from the chassis 201. Fasteners can penetrate the pressure cap 300 and the mounting ear 1316 to extend into the mounting holes, thereby fixing the pressure cap 300 and the motor cover 13 to the chassis 201. This improves the installation stability of the external rotor motor 1.

[0090] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0091] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An external rotor electric machine characterized by, include: The motor body includes a rotor and a stator. The rotor includes a rotor ring, and the stator includes a stator body that extends into the rotor ring. The axial sides of the motor body are a first side and a second side, respectively. The motor cover includes an annular ring and a cover end cap. The annular ring surrounds the motor body circumferentially. The cover end cap is located on the first side of the motor body and covers the axial opening of the annular ring. The cover end cap and the annular ring are engaged by a snap-fit ​​structure and fixedly connected by fasteners.

2. An external rotor electric machine according to claim 1, characterized in that The snap-fit ​​structure includes a first snap-fit ​​portion on the annular ring and a second snap-fit ​​portion on the end cap. One of the first snap-fit ​​portion and the second snap-fit ​​portion is a snap-fit ​​protrusion and the other is a snap-fit ​​groove. The snap-fit ​​protrusion engages with the snap-fit ​​groove.

3. An external rotor electric machine according to claim 2, characterized in that, The end cap is embedded in the annular ring, the snap-fit ​​groove penetrates the peripheral wall of the annular ring along the radial direction of the stator, and the snap-fit ​​protrusion protrudes from the outer peripheral edge of the end cap toward a direction away from the center of the end cap.

4. An external rotor electric motor as claimed in claim 2, characterised in that, The annular ring includes an arc segment and a clearance segment continuously arranged along the circumference of the stator. In the axial projection of the external rotor motor, the outer contour of the arc segment is a superior arc. The outer contour of the clearance segment is located within the range enclosed by the base circle line where the outer contour of the arc segment is located, and a clearance area is left between the arc segment and the base circle line. The first snap-fit ​​part is provided in the clearance segment.

5. An external rotor electric machine according to claim 4, characterized in that, The avoidance section includes a plurality of straight edge segments arranged sequentially along the circumference of the stator. In the axial projection of the external rotor motor, the outer contour of the straight edge segment extends along the chord of the base circle line. The included angle between the outer contours of two adjacent straight edge segments is an obtuse angle. Each straight edge segment is provided with the first snap-fit ​​portion.

6. An external rotor electric motor as claimed in claim 4, characterised in that, The fastener is located at the arc segment.

7. The external rotor electric machine of claim 1, wherein, The annular ring has a first connecting portion, and the end cap has a second connecting portion. The second connecting portion overlaps the first side of the first connecting portion along the axial direction of the motor body. The fastener is a threaded fastener that passes through the second connecting portion and is threadedly connected to the first connecting portion.

8. The external rotor electric machine of claim 1, wherein, The stator includes a limiting protrusion located at one end of the stator body near the end cap and protruding from the outer circumferential surface of the stator body. A limiting groove is formed inside the annular ring. The limiting groove is open on the side of the stator facing the end cap along the axial direction, forming a groove opening, and a groove bottom wall is formed on the side away from the end cap. A vibration damping sleeve is provided outside the limiting protrusion. The vibration damping sleeve at least covers the two axial end faces of the limiting protrusion. The limiting protrusion and the vibration damping sleeve extend from the groove opening into the limiting groove along the axial direction of the stator and are clamped between the end cap and the groove bottom wall along the axial direction of the stator.

9. An external rotor electric motor as claimed in claim 8, characterised in that, The damping sleeve has a protrusion extending in a direction away from the end cover, and the end cover has a groove formed at a position corresponding to the protrusion, with the protrusion extending into the groove along the axial direction of the stator.

10. The external rotor electric machine of claim 8, wherein, The limiting protrusions are multiple and spaced apart along the circumference of the stator. The limiting grooves are multiple and correspond one-to-one with the multiple limiting protrusions. The damping sleeve also covers the radial outer surface and the two circumferential sides of the limiting protrusions.

11. A cross-flow fan characterized by It includes a cross-flow impeller and an external rotor motor according to any one of claims 1-10, wherein the external rotor motor is disposed at one axial end of the cross-flow impeller, and the rotor ring is coaxially arranged and fixedly connected to the cross-flow impeller.

12. An air conditioner characterized by comprising: include: The air conditioner body and the cross-flow fan according to claim 11, wherein the external rotor motor is fixedly installed on the air conditioner body through the motor cover.

13. The air conditioner of claim 12, wherein The annular ring includes an arc segment and a clearance segment continuously arranged along the circumference of the stator. In the axial projection of the external rotor motor, the outer contour of the arc segment is a superior arc, and the outer contour of the clearance segment is located within the range enclosed by the base circle line where the outer contour of the arc segment is located, and a clearance area is left between the clearance segment and the base circle line. The air conditioner is a wall-mounted air conditioner. The air conditioner body includes a chassis. The axis of the cross-flow fan is in the left-right direction. The motor cover is installed on the chassis. The clearance section is located on the rear side of the motor cover. The chassis includes a chassis back plate located on the rear side of the cross-flow fan. The chassis back plate is recessed into the clearance area at the location corresponding to the clearance section to define a clearance space that intrudes forward into the front side of the rear surface of the chassis back plate. A refrigerant pipe passes through the clearance space.

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