Outer rotor motor, cross-flow fan and air conditioner

Abstract

The utility model discloses an external rotor motor, a cross-flow fan and an air conditioner, and belongs to the technical field of motors, the external rotor motor comprises a rotor, a stator and a stator cover, and the rotor comprises a rotor ring; the stator comprises a stator body and an installation part, the stator body extends into the rotor ring, the installation part is located on the axial outer side of the rotor ring and connected with the shaft end of the stator body, and the installation part comprises a protruding block protruding out of the peripheral face of the stator body; the stator cover comprises an annular ring, the annular ring surrounds the mounting part in the circumferential direction of the stator, a limiting groove is formed in the inner wall of the annular ring, and the limiting groove corresponds to the protruding block and is matched with the protruding block to limit relative circumferential rotation of the stator and the stator cover. According to the outer rotor motor, the limiting grooves are formed in the circumferential direction of the stator cover and matched with the protruding blocks on the installation part of the stator, relative rotation of the stator and the stator cover is limited, and therefore the operation stability and reliability of the outer rotor motor can be improved.

Description

Technical Field

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

[0002] In external rotor motors of related technologies, the rotor rotatably surrounds the stator, and the motor mounting cover is fixedly connected to the stator via an interference fit with a mounting shaft inside the stator. Theoretically, this connection provides stability and support. However, during high-speed motor operation, due to vibrations of internal mechanical components and changes in external load, the stator may rotate circumferentially relative to the motor mounting cover. This not only affects the motor's operational stability but may also cause interference and wear between the stator's wiring and the wiring holes of the motor mounting cover, thus affecting the motor's operational reliability. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the present invention provides an external rotor motor, which is beneficial to improving the operational stability and reliability of the external rotor motor.

[0004] This utility model also proposes a cross-flow fan having the aforementioned external rotor motor.

[0005] This utility model also proposes an air conditioner having the above-mentioned cross-flow fan.

[0006] An external rotor motor according to a first aspect of the present invention includes a rotor, a stator, and a stator cover. The rotor includes a rotor ring; the stator includes a stator body and a mounting portion, the stator body extending into the rotor ring, the mounting portion being located axially outside the rotor ring and connected to the shaft end of the stator body, the mounting portion including a protrusion protruding from the outer circumferential surface of the stator body; the stator cover includes an annular ring surrounding the mounting portion circumferentially around the stator, the annular ring having a limiting groove on its inner wall, the limiting groove corresponding to and cooperating with the protrusion to restrict the relative circumferential rotation of the stator and the stator cover.

[0007] According to the embodiment of the present invention, the external rotor motor restricts the relative rotation between the stator and the stator cover by setting a limiting groove in the circumferential direction of the stator cover and cooperating with the protrusion on the mounting part of the stator, thereby improving the operating stability and reliability of the external rotor motor.

[0008] In some embodiments, the mounting portion includes a plurality of protrusions, which are spaced apart circumferentially along the stator. The inner wall of the annular ring has a plurality of limiting grooves, which correspond one-to-one with the plurality of protrusions.

[0009] In some embodiments, the stator abuts against the annular ring via a plurality of the protrusions to limit the relative radial movement of the stator and the stator cover.

[0010] In some embodiments, the annular ring has a flange at the axial end near the rotor ring, and the stator cover further includes a cover end cap that is fitted to the axial end of the annular ring away from the rotor ring. The protrusion is axially positioned between the flange and the cover end cap to restrict relative axial movement between the stator and the stator cover.

[0011] In some embodiments, the protrusion is covered with a third damping sleeve, which covers the radial outer surface, axial end faces, and circumferential side faces of the protrusion.

[0012] In some embodiments, the annular ring includes an arc segment and a clearance portion 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 portion is located within the range enclosed by the base circle line of the outer contour of the arc segment, and a clearance area is left between the clearance portion and the base circle line. The limiting groove is provided on the arc segment so that the protrusion and the clearance portion are offset along the circumference of the stator.

[0013] In some embodiments, an outer mounting structure protrudes from the outer wall of the annular ring, and the outer mounting structure is disposed on the arc segment so as to be offset from the avoidance portion along the circumference of the stator.

[0014] In some embodiments, the clearance portion is located on one side of the central vertical plane of the stator. The external mounting structure includes a first mounting ear, a second mounting ear, and a positioning pin. The first mounting ear and the positioning pin are respectively located at the two circumferential ends of the clearance portion and are both located on the same side of the central vertical plane as the clearance portion. The positioning pin is lower than the first mounting ear. The second mounting ear and the clearance portion are respectively located on both sides of the central vertical plane and are lower than the central horizontal plane of the stator.

[0015] In some embodiments, the positioning pin outer sleeve is provided with a first damping sleeve; and / or, at least one of the first mounting ear and the second mounting ear is provided with a second damping sleeve.

[0016] In some embodiments, the stator cover further includes a cover end cap, which is assembled with the annular ring and stops at the axial end of the protrusion away from the rotor. The outer periphery of the cover end cap matches the shape of the inner periphery of the annular ring so that the cover end cap is embedded in the annular ring and covers the axial end of the annular ring.

[0017] In some embodiments, the end cap has a plurality of connecting seats, which are spaced apart circumferentially along the stator, and the connecting seats are connected to the annular ring by fasteners passing through the connecting seats axially.

[0018] In some embodiments, the clearance portion 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, and the included angle between the outer contours of two adjacent straight edge segments is an obtuse angle.

[0019] In some embodiments, the stator cover further includes a protective ring, the outer diameter of which is smaller than the outer diameter of the arc segment. The protective ring is connected to the side of the annular ring axially close to the stator body and surrounds the rotor ring, and is clearance-fitted with the rotor ring.

[0020] According to a second aspect of the present invention, the cross-flow fan includes a fan wheel and a motor. The fan wheel is a cross-flow fan wheel, and the motor is an external rotor motor according to a first aspect of the present invention. The motor is located at one axial end of the fan wheel, and the rotor is coaxially arranged and fixedly connected to the fan wheel.

[0021] According to the embodiments of the present invention, by providing an external rotor motor as described in the first aspect embodiment, the operational stability of the cross-flow fan is improved, and the axial dimension of the impeller is reduced.

[0022] According to a third aspect of the present invention, the air conditioner includes a fan and a chassis. The fan is a cross-flow fan according to a second aspect of the present invention, and the motor is fixedly mounted on the chassis via the stator cover.

[0023] According to the embodiments of the present invention, by incorporating the cross-flow fan of the second aspect embodiment described above, the air conditioner's operational stability is improved, its service life is extended, and its size can be reduced.

[0024] 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

[0025] Figure 1 This is a schematic diagram of a portion of the structure of an air conditioner according to an embodiment of the present invention;

[0026] Figure 2 yes Figure 1 The exploded view of the wind turbine shown;

[0027] Figure 3 yes Figure 1 An exploded view of the components of the motor shown;

[0028] Figure 4 yes Figure 3 A schematic diagram of the stator shown;

[0029] Figure 5 yes Figure 3 A schematic diagram of the ring shown;

[0030] Figure 6 yes Figure 3 An exploded view of the stator cover shown;

[0031] Figure 7 yes Figure 1 A partial cross-sectional view of the fan shown;

[0032] Figure 8 yes Figure 1 A schematic diagram of the axial orthographic projection of the motor shown;

[0033] Figure 9 This is a schematic diagram of a stator cover and a protective ring according to an embodiment of the present invention;

[0034] Figure 10 yes Figure 6 A schematic diagram of the stator cover shown;

[0035] Figure 11 yes Figure 6 A schematic diagram of the end cap shown;

[0036] Figure 12 yes Figure 1 A schematic diagram of the axial orthographic projection of the air conditioner shown;

[0037] Figure 13 yes Figure 1 The rear view of the clearance space shown;

[0038] Figure 14 yes Figure 1 The top view of the vacant space shown.

[0039] Figure 15 yes Figure 1 A schematic diagram of the axial orthographic projection of the chassis shown;

[0040] Figure label:

[0041] Air conditioner 100;

[0042] Chassis 10; clearance space Y; center vertical plane S1; center horizontal plane S2; slot 121;

[0043] Fan 20; Cross-flow fan 20a;

[0044] Wind turbine 2; Cross-flow wind turbine 2a;

[0045] Motor 3; External rotor motor 3a;

[0046] Rotor 31; Rotor ring 311; Shaft 312;

[0047] Stator 32; Stator body 321; Mounting part 322; Protrusion 3222;

[0048] Stator cover 33;

[0049] External structure 330;

[0050] First mounting ear 3311a; Second mounting ear 3311b; Positioning pin 3321; Through hole 33111;

[0051] Circular ring 333;

[0052] Arc segment 3331; clearance section 3332; limiting groove 3333; straight edge segment 3334; flange 3335;

[0053] Base circle C1; Clearance zone C2;

[0054] End cap 334; Connecting seat 3343;

[0055] Protective ring 335;

[0056] First damping sleeve 34; Second damping sleeve 35; Third damping sleeve 36;

[0057] Fastener 40;

[0058] Heat exchanger 60; refrigerant pipe 61. Detailed Implementation

[0059] The embodiments of this utility model are described in detail below. Examples of the 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 intended to explain this utility model, and should not be construed as limiting this utility model.

[0060] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0061] In external rotor motors of related technologies, the rotor rotatably surrounds the stator, and the motor mounting cover is fixedly connected to the stator via an interference fit with a mounting shaft inside the stator. Theoretically, this connection provides stability and support. However, during high-speed motor operation, due to vibrations of internal mechanical components and changes in external load, the stator may rotate circumferentially relative to the motor mounting cover. This not only affects the motor's operational stability but may also cause interference and wear between the stator's wiring and the wiring holes of the motor mounting cover, thus affecting the motor's operational reliability.

[0062] To solve one of the above-mentioned technical problems, this utility model proposes an external rotor motor 3a.

[0063] In some embodiments of this utility model, see Figures 1-3 The external rotor motor 3a includes a rotor 31, a stator 32, and a stator cover 33. The rotor 31 includes a rotor ring 311; the stator 32 includes a stator body 321 and a mounting portion 322. The stator body 321 extends into the rotor ring 311, and the mounting portion 322 is located axially outside the rotor ring 311 and connected to the shaft end of the stator body 321. The mounting portion 322 includes a protrusion 3222 protruding from the outer peripheral surface of the stator body 321; the stator cover 33 includes an annular ring 333. The mounting portion 322 is circumferentially mounted around the stator 32. The inner wall of the annular ring 333 has a limiting groove 3333 corresponding to the protrusion 3222. The limiting groove 3333 cooperates with the protrusion 3222 to restrict the relative circumferential rotation of the stator 32 and the stator cover 33. That is, through the cooperation of the limiting groove 3333 and the protrusion 3222, the stator 32 is prevented from rotating relative to the stator cover 33 in the circumferential direction of the outer rotor motor 3a, or in other words, the stator 32 is prevented from rotating relative to the stator cover 33 around the axis of the stator 32.

[0064] Therefore, according to the embodiment of the present invention, the external rotor motor 3a, by providing a limiting groove 3333 on the circumferential direction of the stator cover 33 and cooperating with the protrusion 3222 on the mounting part 322 of the stator 32, effectively resists the relative rotation between the stator 32 and the stator cover 33, thereby improving the operational stability of the external rotor motor 3a. Furthermore, when the stator cover 33 has a wire outlet hole for the stator 32's wires to extend out, the relative rotation between the stator 32 and the stator cover 33 is hindered, thereby reducing interference wear between the stator 32's wires and the stator cover 33's outlet hole, which would otherwise affect the operational reliability of the external rotor motor 3a.

[0065] Furthermore, compared to the method of "the motor mounting cover being fixedly connected to the stator by an interference fit to the mounting shaft inside the stator," the elimination of the interference fit reduces the assembly difficulty of the stator 32 and the stator cover 33, thereby improving production efficiency. Additionally, the interaction between the protrusion 3222 and the limiting groove 3333 ensures accurate relative positioning between the stator 32 and the annular ring 333, serving a positioning function during installation and further improving assembly efficiency.

[0066] For example, see Figure 2 The stator 32 has a shaft hole 323 at its center, and a sliding bearing 37 is disposed within the shaft hole 323. The rotor ring 311 has a rotating shaft 312 at its center. The rotating shaft 312 is relatively fixed to the rotor ring 311 (for example, it can be directly or indirectly fixed). The rotating shaft 312 is rotatably mounted through the sliding bearing 37 and has a clearance fit with the sliding bearing 37. This allows for relative rotation between the rotor 31 and the stator 32, and helps to reduce the assembly difficulty and improve assembly efficiency. The rotor ring 311 can be an annular magnetic ring, and the stator body 321 can include a stator core and stator windings.

[0067] In the embodiments of this utility model, since the mounting part 322 is connected to the shaft end of the stator body 321, the mounting part 322 can be located on the axial outside of the rotor 31. On the one hand, it can be used for the installation and fixation of the stator 32, and on the other hand, it will not interfere with the rotation of the rotor 31.

[0068] It is worth noting that the protrusion 3222 protruding from the outer peripheral surface of the stator body 321 means that, when projected orthographically along the axial direction of the motor 3, the protrusion 3222 protrudes beyond the outline of the stator body 321 on the projection surface. The stator body 321 may include a stator core, stator coils, and a retaining element. The stator core and stator coils form a stator assembly, and the retaining element encloses the stator assembly and defines the outer peripheral surface of the stator body 321. The projection of the outer peripheral surface of the retaining element is the outline of the stator body 321.

[0069] In the embodiments of this utility model, the shape of the protrusion 3222 is not limited, and is not limited to the elongated shape shown in the figure. It can also be a triangle or other shapes that can cooperate with the limiting groove 3333 to limit the rotation of the stator 32. The shape of the limiting groove 3333 is not limited, and its shape is not limited to the groove shape shown in the figure. It can also be other shapes, but it should cooperate with the protrusion 3222 to limit the rotation of the stator 32. The number of protrusions 3222 and limiting grooves 3333 is not limited to the number shown in the figure. It can be reasonably set according to the force conditions.

[0070] In some embodiments, see Figure 4 The mounting portion 322 includes a plurality of protrusions 3222, which are spaced apart circumferentially along the stator 32. See [reference needed] Figure 5 The inner wall of the annular ring 333 has multiple limiting grooves 3333, and the multiple limiting grooves 3333 correspond to and cooperate with multiple protrusions 3222 one by one.

[0071] This utility model, by setting multiple protrusions 3222 and multiple limiting grooves 3333, can disperse the stress between the stator 32 and the annular ring 333 through the cooperation of the protrusions 3222 and the limiting grooves 3333, avoid structural damage caused by excessive local stress, thereby enhancing the strength of the overall structure and more reliably restricting the relative rotation between the stator 32 and the stator cover 33.

[0072] In some embodiments, see Figure 3 The stator 32 abuts against the annular ring 333 via multiple protrusions 3222 to restrict the relative radial movement of the stator 32 and the stator cover 33, that is, to prevent the stator 32 from moving relative to the stator cover 33 in a direction perpendicular to the axis of the stator 32. Thus, by restricting the relative radial movement of the stator 32 and the stator cover 33 via multiple protrusions 3222, the relative radial movement of the stator 32 and the stator cover 33 no longer needs to be restricted by a through-shaft, thereby simplifying the structure and reducing costs.

[0073] In some embodiments, see Figure 3 and Figure 7Each protrusion 3222 is fitted with a third damping sleeve 36, and the protrusion 3222 abuts radially against the annular ring 333 through the third damping sleeve 36. Thus, by setting the third damping sleeve 36 as a buffer, the vibration energy between the protrusion 3222 and the annular ring 333 can be effectively absorbed and dispersed, thereby reducing noise and vibration during mechanical operation. Furthermore, the third damping sleeve 36 can reduce direct friction and collision between the protrusion 3222 and the annular ring 333, extending their service life and preventing structural damage or wear caused by long-term vibration. Moreover, by selecting damping sleeves of different materials or thicknesses, the damping effect can be adjusted to meet the vibration and noise control requirements under different working conditions. In addition, the third damping sleeve 36 can produce elastic deformation, and the stator 32 can generate a small displacement by compressing the third damping sleeve 36. The stator 32 can adaptively adjust its position relative to the stator cover 33 to improve the coaxiality of the rotor 31 and the stator 32. Of course, this utility model is not limited to this. For example, in other embodiments of this utility model, the third damping sleeve 36 is not omitted, and the protrusion 3222 can also directly abut against the annular ring 333.

[0074] In some embodiments, see Figure 5 and Figure 7 The annular ring 333 has a flange 3335 at its axial end near the rotor ring 311. The stator cover 33 also includes a cover end cap 334, which is assembled and connected to the axial end of the annular ring 333 away from the rotor ring 311. A protrusion 3222 is positioned axially along the stator 32 between the flange 3335 and the cover end cap 334 to restrict the relative axial movement of the stator 32 and the stator cover 33. Thus, by restricting the relative axial movement of the stator 32 and the stator cover 33 through multiple protrusions 3222, the relative axial movement of the stator 32 and the stator cover 33 does not need to be restricted by other means, thereby simplifying the structure and reducing costs. The assembly connection between the cover end cap 334 and the annular ring 333 refers to the fact that they are two separate parts connected together by an assembly method, such as screw connection, snap-fit ​​connection, welding, etc.

[0075] In some embodiments, see Figure 3 and Figure 7 Each protrusion 3222 is fitted with a third damping sleeve 36. The protrusion 3222 abuts against the flange 3335 and the end cap 334 along the axial direction of the stator 32 through the third damping sleeve 36. That is, the side of the protrusion 3222 facing the flange 3335 abuts against the flange 3335 along the axial direction of the stator 32 through the third damping sleeve 36, and the side of the protrusion 3222 facing the end cap 334 abuts against the end cap 334 along the axial direction of the stator 32 through the third damping sleeve 36.

[0076] Therefore, by setting the third damping sleeve 36 as a buffer, the vibration energy between the protrusion 3222 and the stator cover 33 can be effectively absorbed and dispersed, thereby reducing the noise and vibration during mechanical operation. On the other hand, the third damping sleeve 36 can reduce the direct friction and collision between the protrusion 3222 and the stator cover 33, extend the service life of both, and avoid structural damage or wear caused by long-term vibration. Furthermore, by selecting damping sleeves of different materials or thicknesses, the damping effect can be adjusted to meet the vibration and noise control requirements under different working conditions. Of course, this utility model is not limited to this. For example, in other embodiments of this utility model, the third damping sleeve 36 is not omitted, and the protrusion 3222 can also directly abut against the flange 3335 and the end cover 334 respectively.

[0077] In some embodiments, see Figure 3 The protrusion 3222 is covered by a third damping sleeve 36, which encloses the radial outer surface, axial end faces, and circumferential side faces of the protrusion 3222. Thus, the third damping sleeve 36 can indirectly contact the limiting groove 3333 in the circumferential direction, indirectly contact the annular ring 333 in the radial direction, and indirectly contact the flange 3335 and the end cap 334 in the axial direction. Therefore, by using the third damping sleeve 36 as a buffer, the vibration energy between the protrusion 3222 and the stator cover 33 can be effectively absorbed and dispersed, improving the reliability of the external rotor motor 3a and reducing the vibration noise of the external rotor motor 3a.

[0078] In some embodiments, see Figure 5 , Figure 6 and Figure 8 The annular ring 333 includes an arc segment 3331 and a clearance portion 3332 continuously arranged along the circumference of the stator 32. In the axial projection of the outer rotor motor 3a, the outer contour of the arc segment 3331 is a superior arc. The outer contour of the clearance portion 3332 is located within the range enclosed by the base circle line C1 where the outer contour of the arc segment 3331 is located, and a clearance area C2 is left between it and the base circle line C1. The limiting groove 3333 is provided on the arc segment 3331 so that the protrusion 3222 and the clearance portion 3332 are offset along the circumference of the stator 32.

[0079] This invention, by setting the outer contour of the arc segment 3331 as a superior arc and rationally designing the position and size of the clearance part 3332, provides additional space for other components or structures (such as the refrigerant pipes mentioned later), which helps to optimize the spatial layout of the entire system, improve the compactness and integration of the overall structure, and simultaneously ensure the assembly requirements of the stator 32, optimize the overall structure of the annular ring 333, and enhance its deformation resistance and structural strength. In addition, the clearance part 3332 makes it easier for the protrusion 3222 to find the correct position during assembly, thus improving assembly efficiency.

[0080] In the embodiments of this utility model, the arc segment 3331 is an arc-shaped portion continuously arranged along the circumference of the annular ring 333, forming the basic outline of the annular ring 333; the outer outline of the clearance portion 3332 is located inside the base circle line C1 where the arc segment 3331 is located, which means that relative to the entire base circle line C1, the clearance portion 3332 is recessed towards the center of the base circle line C1 to reduce the space occupied, so that the empty clearance area C2 can be used to accommodate other components or structures (such as refrigerant pipes, etc., as described below).

[0081] The outer contour shape of the avoidance part 3332 is not limited to the chord shape shown in the figure. For example, the shape of the avoidance part 3332 can be a curve. The size and position of the avoidance part 3332 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 force situation of the annular ring 333.

[0082] In some embodiments, see Figure 5 , Figure 6 and Figure 8 An outer structure 330 protrudes from the outer wall of the annular ring 333. The outer structure 330 is located on the arc segment 3331 so as to be offset from the avoidance part 3332 along the circumference of the stator 32.

[0083] This utility model places the outer mounting structure 330 on the arc segment 3331 and offset it from the avoidance part 3332. In this way, the outer mounting structure 330 will not occupy the space of the avoidance area C2, which is conducive to better avoidance of the annular ring 333 from other components or structures (such as the refrigerant pipe mentioned later). Moreover, the outer mounting structure 330 will not interfere with the avoided components, which is conducive to the connection of the outer mounting structure 330, thereby simplifying the assembly process and improving assembly efficiency. In addition, the outer mounting structure 330 can be designed in various shapes, sizes and forms to meet different connection, fixing or protection needs, enhancing the practicality and adaptability of the stator cover 33.

[0084] In this embodiment of the invention, the external mounting structure 330 is a structure protruding from the outer wall of the annular ring 333. The external mounting structure 330 can be used to connect and fix with other components to realize the installation of the external rotor motor 3a. The connection method between the external mounting structure 330 and the outer wall of the arc segment 3331 can be an integrated, non-detachable connection, for example, welding, bonding, injection molding, etc.; or it can be a detachable connection, for example, a threaded connection, etc. Furthermore, the cooperation method between the external mounting structure 330 and the external structure is not limited, and can include, for example, a fixed connection, a limiting fit, etc.

[0085] In some embodiments, see Figure 9 The stator cover 33 also includes a protective ring 335. The outer diameter of the protective ring 335 is smaller than the outer diameter of the arc segment 3331. The protective ring 335 is connected to the side of the annular ring 333 that is close to the stator body 321 in the axial direction, and surrounds the rotor ring 311 and is in clearance fit with the rotor ring 311, thereby protecting the rotor ring 311 while ensuring that the rotor ring 311 can rotate.

[0086] Therefore, by setting a protective ring 335 around the outer periphery of the rotor ring 311, the rotor ring 311 can be effectively prevented from being damaged by external objects, thus avoiding damage to the rotor ring 311 during transportation and other processes, thereby improving the operational reliability of the external rotor motor 3a. On the other hand, setting a protective ring 335 prevents the intrusion of external objects or impurities, reducing the wear and corrosion of the rotor ring 311 and helping to extend the service life of the external rotor motor 3a. Furthermore, since the protective ring 335 can block most external objects or impurities, the maintenance frequency and difficulty of the external rotor motor 3a are reduced, and the maintenance cost is correspondingly reduced.

[0087] The protective ring 335 is an annular structure added to the stator cover 33, with one end connected to the annular ring 333, used to enhance the protection of the stator body 321 and the rotor ring 311. The connection method between the protective ring 335 and the annular ring 333 is not limited. For example, it can be an integrated, non-detachable connection, such as integral molding, welding, bonding, or injection molding, which simplifies the assembly process and improves the strength and stability of the overall structure; or it can be a detachable connection, which allows for easy disassembly and replacement, facilitating maintenance and repair, and reducing maintenance costs. The shape of the protective ring 335 is not limited to the circular ring shown in the figure; it can also be an ellipse, rectangle, polygon, or other closed shapes.

[0088] For example, the protective ring 335 is annular. The annular protective ring 335 can uniformly surround the rotor ring 311, which can reduce the fitting gap between the protective ring 335 and the rotor ring 311, reduce space occupation, facilitate miniaturization, and provide all-round protection, effectively blocking the intrusion of external objects or impurities, thereby ensuring the stable operation of the motor 3; the annular protective ring 335 gives the protective ring 335 a uniform thickness and strength, which can withstand a certain amount of external impact, further enhancing the overall structural strength of the external rotor motor 3a; the manufacturing of the annular protective ring 335 is relatively simple, reducing manufacturing costs and improving production efficiency.

[0089] In some embodiments, see Figure 8 The clearance portion 3332 is located on one side of the central vertical plane S1 of the stator 32. The external mounting structure 330 includes a first mounting ear 3311a, a second mounting ear 3311b, and a positioning pin 3321. The first mounting ear 3311a and the positioning pin 3321 are respectively located at the two circumferential ends of the clearance portion 3332, and are both located on the same side of the central vertical plane S1 as the clearance portion 3332. The positioning pin 3321 is lower than the first mounting ear 3311a. The second mounting ear 3311b and the clearance portion 3332 are respectively located on both sides of the central vertical plane S1, and are lower than the central horizontal plane S2 of the stator 32. Here, the central vertical plane S1 refers to the plane that passes through the center of the stator 32 and extends vertically, and the central horizontal plane S2 refers to the plane that passes through the center of the stator 32 and extends horizontally.

[0090] The external mounting structure 330 includes a first mounting ear 3311a, a second mounting ear 3311b, and a positioning pin 3321. These three external mounting structures 330 are distributed separately, forming a three-point fixation configuration. This makes the installation of the stator 32 more stable, stabilizes the axis of the stator 32, and improves the coaxiality between the rotor 31 and the stator 32. Moreover, since the first mounting ear 3311a and the positioning pin 3321 are respectively located at the two circumferential ends of the clearance portion 3332, and are both located on the same side of the central vertical plane S1, the positioning pin 3321 is lower than the first mounting ear 3311a, and the second mounting ear 3311b and the clearance portion 3332 are respectively located on both sides of the central vertical plane S1, and are lower than the central horizontal plane S2 of the stator 32. This provides reinforcement support for the clearance portion 3332, making the installation of the stator cover 33 more reliable and enabling the stator cover 33 to achieve better installation and support.

[0091] In some embodiments, see Figure 6 The positioning pin 3321 is provided with a first damping sleeve 34; and / or, at least one of the first mounting ear 3311a and the second mounting ear 3311b is provided with a second damping sleeve 35.

[0092] By installing a first damping sleeve 34 over the positioning pin 3321, wear between the positioning pin 3321 and the slot 121 caused by vibration or impact can be effectively reduced, improving the stability of motor 3 operation. Simultaneously, the first damping sleeve 34 can absorb some vibration energy, reducing noise. Installing a second damping sleeve 35 on the mounting ear can reduce vibration and impact transmitted through the mounting ear, protecting the mounting ear and its connected components from damage. Furthermore, it facilitates adaptive adjustment of the central axis position of the stator cover 33, thereby improving the coaxiality of the stator 32 and rotor 31.

[0093] For example, the mounting ears (first mounting ear 3311a, second mounting ear 3311b) have a through hole 33111, and a first boss is provided in the through hole 33111. The second damping sleeve 35 has a first groove on its outer periphery. The first boss of the through hole 33111 and the first groove of the second damping sleeve 35 are matched to limit the rubber to ensure that it is in the right position.

[0094] For example, the positioning pin 3321 is provided with a second protrusion, and the first damping sleeve 34 is provided with a second groove. The second protrusion of the positioning pin 3321 and the second groove of the first damping sleeve 34 are matched in a limiting manner, so that the two can fit tightly together, thereby increasing the operating stability of the external rotor motor 3a.

[0095] In some embodiments, see Figure 7 , Figure 10 and Figure 11 The stator cover 33 also includes a cover end cover 334, which is assembled and connected to the annular ring 333 and stops at the shaft end of the protrusion 3222 away from the rotor 31. The outer periphery of the cover end cover 334 matches the shape of the inner periphery of the annular ring 333 so that the cover end cover 334 is embedded in the annular ring 333 and covers the shaft end of the annular ring 333.

[0096] The end cover 334 is embedded in the annular ring 333, which means that the end cover 334 is installed into the annular ring 333. The outer periphery of the end cover 334 matches the inner periphery of the annular ring 333 in shape, which means that the shape of the surface of the end cover 334 facing the annular ring 333 matches the shape of the surface of the annular ring 333 facing the end cover 334. After the end cover 334 is embedded and assembled, the fit gap between the two is uniform, which is conducive to forming a smaller fit gap between the two, thereby improving the sealing performance of the stator cover 33 on the side away from the rotor 31.

[0097] In the above technical solution, since the outer periphery of the end cover 334 matches the inner periphery of the annular ring 333, the end cover 334 is embedded in the annular ring 333 and seals the shaft end of the annular ring 333. The end cover 334 enhances the structural integrity of the stator cover 33, enabling the stator cover 33 to better fix and protect the stator 32, thereby improving the overall stability and durability of the motor 3. It also helps prevent external impurities such as dust and moisture from entering the motor 3, improving the sealing performance and operational safety of the motor 3. Furthermore, it makes the assembly, installation, and disassembly between the stator cover 33 and the stator 32 simpler and easier to produce.

[0098] In some embodiments, see Figure 7 The end of the annular ring 333 away from the end cap 334 has a flange 3335, and the protrusion 3222 is positioned between the flange 3335 and the end cap 334 along the axial direction of the stator 32.

[0099] This invention enhances the stability of the stator 32 structure by providing a flange 3335 at the end of the annular ring 333 away from the end cap 334, which, together with the end cap 334, axially limits the protrusion 3222. The flange 3335 and the end cap 334 serve as two fixed support points, preventing the protrusion 3222 from moving axially in the stator 32. During assembly, the protrusion 3222 is first inserted into the annular ring 333, directly or indirectly abutting against the flange 3335. Then, the end cap 334 is installed onto the annular ring 333, directly or indirectly abutting against the other end of the protrusion 3222. This eliminates the need for additional axial limiting devices or complex assembly steps, simplifying the structure and assembly.

[0100] In the embodiments of this utility model, the connection between the flange 3335 and the annular ring 333 can be integrally formed, which can simplify the manufacturing process and improve the strength and stability of the overall structure; or it can be detachably connected, which can be easily disassembled and replaced, facilitate maintenance and repair, and reduce maintenance costs; the shape of the flange 3335 is not limited to the circular ring shown in the figure, but can also be elliptical, rectangular, polygonal or other closed shapes.

[0101] In some embodiments, see Figure 6 and Figure 11 The end cover 334 has multiple connecting seats 3343, which are spaced apart circumferentially along the stator 32. The connecting seats 3343 are connected to the annular ring 333 by fasteners 40 passing through the connecting seats 3343 axially.

[0102] This invention enhances the connection stability between the end cover 334 and the annular ring 333 by providing multiple connecting seats 3343 on the end cover 334 and connecting them to the annular ring 333 via fasteners 40. The multiple connecting seats 3343 are spaced apart circumferentially along the stator 32, resulting in a more uniform connection and effectively preventing the end cover 334 from twisting or deforming under stress. The multiple connecting seats 3343 also facilitate the maintenance and replacement of the end cover 334, reducing maintenance costs and improving the maintainability of the equipment. When repairing or replacing the stator 32, the end cover 334 can be easily disassembled without complex disassembly of the entire stator 32 structure. Furthermore, the fasteners 40 pass axially through the connecting seats 3343, reducing the space occupied on the outer periphery of the annular ring 333 and decreasing the ring width requirement for the fasteners 40.

[0103] In an embodiment of this invention, the connecting seat 3343 is the portion of the end cap 334 used for connection with the annular ring 333. The connecting seat 3343 is spaced circumferentially along the stator 32 to form a stable connection with the annular ring 333. Exemplarily, the fastener 40 can be a screw, and the connecting seat 3343 is a simple columnar structure with a through hole that matches the fastener 40. The fastener 40 passes through the through hole of the connecting seat 3343 and connects with the threaded hole on the annular ring 333. This design is simple in structure and easy to process and assemble.

[0104] In some embodiments, see Figure 8 The clearance portion 3332 includes a plurality of straight edge segments 3334 arranged sequentially along the circumference of the stator 32. In the axial projection of the outer rotor motor 3a, the outer contour of the straight edge segment 3334 extends along the chord of the base circle line C1, and the included angle α between the outer contours of two adjacent straight edge segments 3334 is an obtuse angle.

[0105] The application of straight edge segment 3334 as a clearance part 3332 can effectively reduce the space occupied by the structure, making the overall design more compact. Compared with complex curved edges, straight edge segment 3334 has lower processing costs and easier processing accuracy control, which helps to improve production efficiency and reduce costs. Multiple straight edge segments 3334 are arranged in sequence to form clearance part 3332, which allows clearance part 3332 to adapt to more complex interference situations and provide more flexible clearance space for other components or structures. Multiple straight edge segments 3334 and arc segment 3331 together form the annular ring 333 of stator cover 33. By rationally distributing multiple straight edge segments 3334, stress path can be optimized and the overall strength of the structure can be improved.

[0106] This utility model also proposes a cross-flow fan 20a having the aforementioned external rotor motor 3a.

[0107] In some embodiments of this utility model, see Figure 1 and Figure 2 The cross-flow fan 20a includes a fan wheel 2 and a motor 3. The fan wheel 2 is a cross-flow fan wheel 2a, and the motor 3 is an external rotor motor 3a of any of the above embodiments. The motor 3 is located at one axial end of the fan wheel 2, and the rotor 31 is coaxially arranged and fixedly connected to the fan wheel 2.

[0108] According to the present invention, the cross-flow fan 20a improves the operational stability of the cross-flow fan 20a by setting an external rotor motor 3a in any embodiment, and since the rotor 31 is fixedly connected to the impeller 2, it is beneficial to shorten the axial length of the cross-flow fan 20a.

[0109] This utility model also proposes an air conditioner 100 having the above-mentioned cross-flow fan 20a.

[0110] In some embodiments of this utility model, see Figure 1 The air conditioner 100 includes a fan 20 and a chassis 10. The fan 20 is a cross-flow fan 20a as described in the above embodiment, and the motor 3 is fixedly installed on the chassis 10 through a stator cover 33.

[0111] According to the present invention, by setting the cross-flow fan 20a of the above embodiment, the air conditioner 100 improves the operational stability of the air conditioner 100, extends the service life of the air conditioner 100, and achieves miniaturization of the size of the air conditioner 100.

[0112] In some embodiments, see Figure 1 and combined Figure 12-14 The air conditioner 100 is a wall-mounted air conditioner. The axial direction of the cross-flow fan 2a and the axial direction of the motor 3 are both in the left-right direction. The axis of the stator 32 is horizontally set. The rear plate of the chassis 10 forms a clearance space Y that intrudes in the direction of the motor 3 (i.e., forward) at the corresponding motor 3. The clearance part 3332 is located behind the arc segment 3331 and avoids the clearance space Y. The refrigerant pipe 61 of the heat exchanger 60 of the air conditioner 100 passes through the clearance space Y. Thus, the clearance part 3332 provides clearance space for the passage of the refrigerant pipe 61, thereby preventing the refrigerant pipe 61 from protruding backward from the rear plate of the chassis 10. This allows the rear plate of the chassis 10 to be installed against the wall, reducing the size of the air conditioner 100 in the front-rear direction. Furthermore, the refrigerant pipe 61 does not occupy the outer space of the fan 20 in the axial direction, thereby reducing the size of the air conditioner 100 in the axial direction (i.e., left-right direction).

[0113] For example, see Figure 12 and Figure 15 The chassis 10 has a recessed slot 121 facing away from the motor 3. The positioning pin 3321 is positioned and engaged with the slot 121 to achieve accurate installation of the stator cover 33 on the chassis 10.

[0114] Hereinafter, with reference to the accompanying drawings, an air conditioner 100 according to a specific embodiment of the present invention will be described.

[0115] See Figures 1-8 and combined Figures 10-15 The air conditioner 100 includes a fan 20 and a chassis 10. The fan 20 is a cross-flow fan 20a, which includes a rotor 2 and a motor 3. The rotor 2 is a cross-flow impeller 2a, and the axial direction of the cross-flow impeller 2a and the axial direction of the motor 3 are both in the left-right direction. The motor 3 is located at one end of the axial direction of the rotor 2. The motor 3 is an external rotor motor 3a, which includes a rotor 31, a stator 32, and a stator cover 33. The rotor 31 includes a rotor ring 311, which is coaxially arranged and fixedly connected to the impeller 2. The stator 32 includes a stator body 321 and a mounting part 322. The axis of the stator 32 is horizontally arranged, the stator body 321 extends into the rotor ring 311, and the mounting part 322 is located on the rotor ring 311. The mounting part 322 is located on the side of the stator body 321 away from the impeller 2 along the axial direction of the stator body 321. The mounting part 322 includes a plurality of protrusions 3222 protruding from the outer peripheral surface of the stator body 321. The stator cover 33 includes an annular ring 333 and a cover end cap 334. The annular ring 333 surrounds the mounting part 322 along the circumference of the stator 32. The inner wall of the annular ring 333 has a plurality of limiting grooves 3333 that correspond to the plurality of protrusions 3222. The cover end cap 334 covers the side of the annular ring 333 away from the impeller 2. The end of the annular ring 333 near the impeller 2 has a flange 3335. The protrusions 3222 are limited between the flange 3335 and the cover end cap 334 along the axial direction of the stator 32. Each protrusion 3222 is fitted with a third damping sleeve 36. The protrusion 3222 is indirectly in contact with the stator cover 33 in the circumferential, radial and axial directions of the stator 32 through the third damping sleeve 36.

[0116] The annular ring 333 includes a continuous circumferential arc segment 3331 and a clearance portion 3332. The arc segment 3331 is a superior arc, and an outer mounting structure 330 protrudes from the outer wall of the arc segment 3331. The outer mounting structure 330 and the clearance portion 3332 are offset from each other along the circumference of the stator 32. The clearance portion 3332 is located behind the central vertical surface S1 of the stator 32. The outer mounting structure 330 includes a first mounting ear 3311a, a second mounting ear 3311b, and a positioning pin 3321. The first mounting ear 3311a and the positioning pin 3321 are also located behind the central vertical surface S1 of the stator 32, and are respectively located above and below the clearance portion 3332. The second mounting ear 3311b is located in front of the central vertical surface S1 and is higher than the central horizontal surface S2 of the stator 32. The positioning pin 3321 is covered with a first damping sleeve 34; the first mounting ear 3311a and the second mounting ear 3311b are both provided with second damping sleeves 35.

[0117] The stator cover 33 is fixedly mounted on the chassis 10. The rear plate of the chassis 10 forms a clearance space Y that intrudes towards the motor 3 at the corresponding motor 3. The refrigerant pipe 61 of the heat exchanger 60 of the air conditioner 100 passes through the clearance space Y. The clearance portion 3332 is located behind the annular ring 33 and clears the clearance space Y. The clearance portion 3332 includes a straight edge segment 3334 extending along the chord of the base circle where the arc segment 3331 is located. The clearance portion 3332 includes a plurality of straight edge segments 3334, which are arranged adjacent to each other in the circumferential direction. The outer periphery of the cover end cap 334 matches the shape of the inner periphery of the annular ring 333 so that the cover end cap 334 is embedded in the annular ring 333 and seals the shaft end of the annular ring 333.

[0118] Other configurations and operations of the air conditioner 100 according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0119] 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", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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.

[0120] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0121] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0122] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0123] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0124] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An external rotor motor, characterized in that, include: Rotor, the rotor including rotor rings; The stator includes a stator body and a mounting portion. The stator body extends into the rotor ring, and the mounting portion is located on the axial outer side of the rotor ring and connected to the shaft end of the stator body. The mounting portion includes a protrusion protruding from the outer peripheral surface of the stator body. The stator cover includes an annular ring that surrounds the mounting portion around the stator circumferentially. The inner wall of the annular ring has a limiting groove that corresponds to and cooperates with the protrusion to restrict the relative circumferential rotation of the stator and the stator cover.

2. The external rotor motor according to claim 1, characterized in that, The mounting part includes a plurality of protrusions, which are spaced apart circumferentially along the stator. The inner wall of the annular ring has a plurality of limiting grooves, which correspond one-to-one with the plurality of protrusions.

3. The external rotor motor according to claim 2, characterized in that, The stator abuts against the annular ring via a plurality of protrusions to restrict the relative radial movement of the stator and the stator cover.

4. The external rotor motor according to claim 2, characterized in that, The annular ring has a flange at the axial end near the rotor ring, and the stator cover also includes a cover end cap, which is assembled and connected to the axial end of the annular ring away from the rotor ring. The protrusion is positioned axially between the flange and the cover end cap to restrict the relative axial movement of the stator and the stator cover.

5. The external rotor motor according to claim 1, characterized in that, The protrusion is covered by a third damping sleeve, which covers the radial outer surface, axial end faces, and circumferential side faces of the protrusion.

6. The external rotor motor according to claim 1, characterized in that, The annular ring includes an arc segment and a clearance portion 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 portion is located within the range enclosed by the base circle line of the outer contour of the arc segment, and a clearance area is left between the clearance portion and the base circle line. The limiting groove is provided on the arc segment so that the protrusion and the clearance portion are offset along the circumference of the stator.

7. The external rotor motor according to claim 6, characterized in that, An external mounting structure protrudes from the outer wall of the annular ring. The external mounting structure is located on the arc segment so as to be offset from the avoidance part along the circumference of the stator.

8. The external rotor motor according to claim 7, characterized in that, The clearance portion is located on one side of the central vertical plane of the stator. The external mounting structure includes a first mounting ear, a second mounting ear, and a positioning pin. The first mounting ear and the positioning pin are respectively located at the two circumferential ends of the clearance portion, and are both located on the same side of the central vertical plane as the clearance portion. The positioning pin is lower than the first mounting ear. The second mounting ear and the clearance portion are respectively located on both sides of the central vertical plane, and are lower than the central horizontal plane of the stator.

9. The external rotor motor according to claim 8, characterized in that, The positioning pin is provided with a first damping sleeve; and / or, at least one of the first mounting ear and the second mounting ear is provided with a second damping sleeve.

10. The external rotor motor according to claim 6, characterized in that, The stator cover also includes a cover end cap, which is assembled and connected to the annular ring and stops at the shaft end of the protrusion away from the rotor. The outer periphery of the cover end cap matches the shape of the inner periphery of the annular ring so that the cover end cap is embedded in the annular ring and seals the shaft end of the annular ring.

11. The external rotor motor according to claim 10, characterized in that, The end cap has multiple connecting seats, which are spaced apart circumferentially along the stator. The connecting seats are connected to the annular ring by fasteners that pass through the connecting seats axially.

12. The external rotor motor according to claim 6, characterized in that, The clearance portion 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, and the included angle between the outer contours of two adjacent straight edge segments is an obtuse angle.

13. The external rotor motor according to claim 6, characterized in that, The stator cover also includes a protective ring, the outer diameter of which is smaller than the outer diameter of the arc segment. The protective ring is connected to the side of the annular ring that is close to the stator body in the axial direction and surrounds the rotor ring and is in clearance fit with the rotor ring.

14. A cross-flow fan, characterized in that, include: The wind turbine and the motor are provided, wherein the wind turbine is a cross-flow wind turbine, and the motor is an external rotor motor according to any one of claims 1-13. The motor is located at one axial end of the wind turbine, and the rotor is coaxially arranged and fixedly connected to the wind turbine.

15. An air conditioner, characterized in that, include: The fan and the chassis, wherein the fan is a cross-flow fan according to claim 14, and the motor is fixedly mounted on the chassis through the stator cover.

Images