Outer rotor fan and air conditioner

Abstract

The application discloses an outer rotor fan and an air conditioner. The outer rotor fan comprises a stator assembly, a rotor assembly, an air wheel and a flexible piece. The stator assembly comprises a stator frame. The rotor assembly comprises a rotor frame and a rotating shaft fixed on the rotor frame. The rotating shaft is rotatably arranged on the stator frame. The air wheel is provided with a connecting piece at the end portion in the circumferential direction. The connecting piece is arranged in the direction away from the air wheel. The connecting piece and the end portion of the air wheel form an accommodating space. The rotor frame is accommodated in the accommodating space. The flexible piece is located between the rotor frame and the connecting piece. The first transmission structure is arranged between the flexible piece and the rotor frame. The second transmission structure is arranged between the flexible piece and the connecting piece. The rotor frame is in transmission connection with the connecting piece through the first transmission structure and the second transmission structure. The torque generated by the rotor assembly is transmitted to the air wheel. The flexible piece is compressed under force. The vibration of the rotor assembly and the air wheel is absorbed. The shock absorption effect is realized. The noise of the fan is reduced.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to an external rotor fan and an air conditioner. Background Technology

[0002] Traditional air conditioners use external rotor motors to reduce the axial space of the air conditioner. In order to connect the motor and the impeller, the existing technology usually welds the external rotor motor rotor assembly to the impeller as a whole. This means that the rotor assembly cannot form an independent motor system with the stator assembly, which is not conducive to the control of motor quality. At the same time, the direct welding of the rotor assembly to the impeller can easily amplify and transmit the vibration caused by the electromagnetic force of the motor through the impeller, resulting in increased noise and worsened hearing. Summary of the Invention

[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 fan that can both ensure the axial space of the air conditioner and integrate the motor into one unit, isolating it from the impeller, thereby solving the quality control and noise problems of the air conditioner.

[0004] The present invention also provides an air conditioner employing the above-described external rotor fan.

[0005] According to a first aspect of the present invention, an external rotor fan includes a stator assembly, a rotor assembly, a rotor, and a flexible member. The stator assembly includes a stator frame; the rotor assembly includes a rotor frame and a rotating shaft fixedly disposed on the rotor frame, the rotating shaft being rotatably disposed on the stator frame; a connecting member is circumferentially disposed at the end of the rotor, the connecting member extending in a direction away from the rotor, forming a receiving space between the connecting member and the end of the rotor, the rotor frame being at least partially accommodated in the receiving space; the flexible member is arranged in a ring shape along the circumference of the rotor frame and is located between the rotor frame and the connecting member, a first transmission structure is provided between the flexible member and the rotor frame, and a second transmission structure is provided between the flexible member and the connecting member, the rotor frame being drively connected to the connecting member through the first transmission structure and the second transmission structure to transmit the torque generated by the rotor assembly to the rotor.

[0006] The external rotor fan according to embodiments of the present invention has at least the following beneficial effects: The rotor assembly and impeller of the present invention are connected by a flexible member disposed circumferentially on the rotor frame. The torque generated by the rotor assembly is transmitted to the impeller through the flexible member. The torque transmission sequence is as follows: the rotor assembly generates electromagnetic torque, which is then transmitted to the flexible member through the rotor frame, and finally to the impeller through the flexible member. During this process, the flexible member is compressed, absorbing the vibration of the rotor assembly and the impeller to achieve vibration damping, thereby reducing fan noise. Furthermore, the flexible member isolates the rotor assembly and the impeller radially and axially, preventing mutual interference between them. The external rotor motor and the impeller are connected by the flexible member, facilitating the assembly and disassembly of the external rotor motor and the impeller, thus aiding in motor quality control. Simultaneously, the rotor assembly and the impeller are connected by a flexible member disposed circumferentially on the rotor frame and a connecting member disposed circumferentially along the end of the impeller, thereby reducing the axial distance between the motor and the impeller.

[0007] According to some embodiments of the present invention, the first transmission structure includes a plurality of spaced-apart first transmission bosses and a plurality of spaced-apart first grooves. One of the first transmission bosses and the first grooves extends axially along the rotor frame and is disposed on the outer peripheral surface of the rotor frame, and the other is disposed on the inner wall surface of the flexible member. The first transmission bosses and the first grooves are disposed in a one-to-one correspondence, and the first transmission boss is disposed on the corresponding first groove.

[0008] According to some embodiments of the present invention, the connector is annular, and the second transmission structure includes a plurality of spaced second transmission bosses and a plurality of spaced second grooves. One of the second transmission bosses and the second grooves extends along the axial direction of the rotor frame and is disposed on the inner wall surface of the connector, and the other is disposed on the outer wall surface of the flexible member. The second transmission bosses and the second grooves are disposed in a one-to-one correspondence, and the second transmission boss is disposed on the corresponding second groove.

[0009] According to some embodiments of the present invention, both the first groove and the second groove are provided on the flexible member, and a transmission portion is formed between adjacent first grooves and second grooves, wherein the thickness of the transmission portion along the circumferential direction of the flexible member is greater than or equal to 2 mm.

[0010] According to some embodiments of the present invention, a receiving groove is formed between two adjacent first transmission bosses, and the receiving groove extends through the outer peripheral surface of the rotor frame along the axial direction of the rotor frame.

[0011] According to some embodiments of the present invention, a receiving groove is formed between two adjacent first transmission bosses, the receiving groove is closed at one end away from the impeller, and the other end extends along the axial direction of the rotor frame to the outer peripheral edge of the rotor frame.

[0012] According to some embodiments of the present invention, the end of the first groove near the wind turbine is closed.

[0013] According to some embodiments of the present invention, a shaft positioning boss is provided on one side of the rotor frame near the wind turbine.

[0014] According to some embodiments of the present invention, an end plate is provided at the end of the wind turbine near the rotor frame, and the end plate is provided with a clearance hole for avoiding the positioning boss of the rotating shaft.

[0015] According to some embodiments of the present invention, the elastic modulus of the rotor frame connected to the flexible member is E1, the elastic modulus of the connector connected to the flexible member is E2, and the elastic modulus of the flexible member is less than or equal to (E1+E2) / 10.

[0016] According to some embodiments of the present invention, the stator frame is provided with a rubber ring, the rubber ring is provided with a sealing ring, the sealing ring extends radially toward the rotating shaft along the rubber ring, the rubber ring is interference-fitted with the circumferential surface of the stator frame, and the sealing ring abuts against the end edge of the stator frame near the impeller.

[0017] According to some embodiments of the present invention, the sealing ring is provided with a protective ear, which is inclined along the axial direction of the rotor toward the impeller, and a waterproof structure is formed between the protective ear and the connecting member.

[0018] An air conditioner according to a second aspect of the present invention includes an external rotor fan according to a first aspect of the present invention.

[0019] The air conditioner according to embodiments of the present invention has at least the following beneficial effects: The external rotor fan used in the air conditioner of the present invention has its rotor assembly and impeller connected by a flexible component disposed around the rotor frame. The torque generated by the rotor assembly is transmitted to the impeller through the flexible component. The torque transmission sequence is as follows: the rotor assembly generates electromagnetic torque, which is transmitted to the flexible component through the rotor frame, and then to the impeller through the flexible component. During this process, the flexible component is compressed, absorbing the vibration of the rotor assembly and the impeller to achieve a shock absorption effect, thereby reducing fan noise and improving the quality of the air conditioner. Furthermore, the flexible component isolates the rotor assembly and the impeller radially and axially, avoiding mutual interference between the rotor assembly and the impeller. The connection between the external rotor motor and the impeller through the flexible component facilitates the assembly and disassembly of the external rotor motor and the impeller, which is beneficial for motor quality control. At the same time, the connection between the rotor assembly and the impeller through the flexible component disposed around the rotor frame and the connecting component disposed around the end of the impeller reduces the axial distance between the motor and the impeller, thereby reducing the axial space of the air conditioner.

[0020] Additional aspects and advantages of the 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

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0022] Figure 1 This is a schematic diagram of the assembly of an external rotor fan according to an embodiment of the present invention;

[0023] Figure 2 This is an exploded view of the motor portion of an external rotor fan according to an embodiment of the present invention;

[0024] Figure 3 This is a cross-sectional view of the motor portion of an external rotor fan according to an embodiment of the present invention;

[0025] Figure 4 This is a front view of the rotor and impeller assembly of an external rotor fan according to an embodiment of the present invention;

[0026] Figure 5 This is a three-dimensional schematic diagram of the impeller of an external rotor fan according to an embodiment of the present invention;

[0027] Figure 6 This is a three-dimensional schematic diagram of the flexible component of an external rotor fan according to an embodiment of the present invention;

[0028] Figure 7 This is a three-dimensional schematic diagram of the rotor assembly of an external rotor fan according to an embodiment of the present invention;

[0029] Figure 8 This is a three-dimensional schematic diagram of the rotor assembly of an external rotor fan according to an embodiment of the present invention.

[0030] Figure 9 This is a three-dimensional schematic diagram of the stator assembly of an external rotor fan according to an embodiment of the present invention;

[0031] Figure 10 for Figure 1 A magnified view of a portion of point A in the middle.

[0032] Icon labels:

[0033] External rotor fan 100;

[0034] External rotor motor 200;

[0035] Stator assembly 300, stator core 301, insulating frame 302, enameled wire 303, pin 304, stator frame 305, positioning ring 306, rubber ring 307, sealing ring 308, protective ear 309, bearing housing 310, bearing 311, rotation space 312, end cover 313;

[0036] Rotor assembly 400, rotor frame 401, first transmission boss 402, shaft positioning boss 403, receiving groove 404, shaft 405, permanent magnet 406, rotor yoke 407.

[0037] Wind turbine 500, end plate 501, clearance hole 502, connector 503, accommodating space 504, second transmission boss 505;

[0038] Flexible component 600, first groove 601, axial positioning boss 602, second groove 603, transmission part 604. Detailed Implementation

[0039] Embodiments of the present invention 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 the present invention, and should not be construed as limiting the present invention.

[0040] In the description of this invention, it should be understood that the orientation descriptions, such as left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and 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. Therefore, they should not be construed as limiting this invention.

[0041] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0042] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0043] To reduce the axial space of air conditioners, an external rotor motor is typically used. The connection between the external rotor motor and the impeller is a major problem in the industry. In existing technology, the external rotor motor rotor assembly is usually welded to the impeller as a single unit. This prevents the rotor assembly from forming an independent motor system with the stator assembly, hindering motor quality control. Furthermore, direct welding of the rotor assembly to the impeller amplifies vibrations caused by the motor's electromagnetic forces, leading to increased noise and a worse listening experience.

[0044] To address the aforementioned problems in the prior art, the present invention provides an external rotor fan.

[0045] The following is combined Figures 1 to 10 The structure and working principle of the external rotor fan 100 according to an embodiment of the present invention are described in detail.

[0046] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 The external rotor fan 100 of the first aspect of the present invention includes a stator assembly 300, a rotor assembly 400, a wind turbine 500 and a flexible component 600.

[0047] like Figure 1 , Figure 3 As shown, the stator assembly 300 and the rotor assembly 400 are assembled into an external rotor motor 200. The stator assembly 300 includes a stator frame 305, which is provided with a bearing housing 310 and a positioning ring 306. A bearing 311 is installed in the bearing housing 310. A rotation space 312 is provided between the positioning ring 306 and the bearing housing 310. The stator assembly 300 is provided with an end cover 313.

[0048] The rotor assembly 400 includes a rotor frame 401 and a rotating shaft 405. The rotating shaft 405 is fixed to the rotor frame 401 and is rotatably mounted on the stator frame 305 via a bearing 311. The end edge portion of the rotor frame 401 away from the rotating shaft 405 is located within the rotation space 312. When the rotating shaft 405 rotates, it drives the rotor frame 401 to rotate synchronously.

[0049] The wind turbine 500 is connected to the external rotor motor 200 through the flexible component 600, thereby driving the wind turbine 500 to rotate through the external rotor motor 200.

[0050] Specifically, refer to Figures 1 to 5 A connector 503 is provided circumferentially at the end of the impeller 500. The connector 503 extends in a direction away from the impeller 500, and the end of the connector 503 away from the impeller 500 is located in the rotation space 312. A receiving space 504 is formed between the connector 503 and the end of the impeller 500. The rotor frame 401 is at least partially housed in the receiving space 504. The flexible member 600 can be made of a shock-absorbing material, such as rubber, silicone rubber, etc. The flexible member 600 is arranged in a ring along the circumference of the rotor frame 401 and is located between the rotor frame 401 and the connector 503. It should be noted that the flexible component 600 is located between the rotor frame 401 and the connecting component 503. This means that the rotor frame 401, the flexible component 600, and the connecting component 503 are arranged in sequence in the radial direction away from the rotor shaft. Thus, the flexible component 600 isolates the rotor assembly 400 from the impeller 500 in both the radial and axial directions, preventing direct contact between the rotor assembly 400 and the impeller 500.

[0051] A first transmission structure is provided between the flexible component 600 and the rotor frame 401, and a second transmission structure is provided between the flexible component 600 and the connecting component 503. The rotor frame 401 is connected to the connecting component 503 through the first and second transmission structures to transmit the torque generated by the rotor assembly 400 to the wind turbine 500.

[0052] In this invention, the rotor assembly 400 and the impeller 500 are connected by a flexible member 600 disposed circumferentially on the rotor frame 401. The torque generated by the rotor assembly 400 is transmitted to the impeller 500 through the flexible member 600. The torque transmission sequence is as follows: the rotor assembly 400 generates electromagnetic torque, which is transmitted to the flexible member 600 through the rotor frame 401, and then to the impeller 500 through the flexible member 600, causing the impeller 500 to rotate. During this process, the flexible member is compressed and absorbs the vibration of the rotor assembly 400 and the impeller 500 to achieve a shock absorption effect, thereby reducing the noise of the fan. Furthermore, the flexible component 600 isolates the rotor assembly 400 from the impeller 500 in the radial and axial directions, preventing mutual interference between the rotor assembly 400 and the impeller 500. The outer rotor motor 200 and the impeller 500 are connected by the flexible component 600, which facilitates the assembly and disassembly of the outer rotor motor 200 and the impeller 500 and is beneficial for the quality control of the motor. At the same time, the rotor assembly 400 and the impeller 500 are connected by the flexible component 600 located circumferentially on the rotor frame 401 and the connecting component 503 located circumferentially at the end of the impeller 500, thereby reducing the axial distance between the motor and the impeller 500.

[0053] Understandably, in order to better isolate the rotor assembly 400 and the impeller 500 along the axial direction, the end of the flexible component 600 near the impeller 500 abuts against the end plate 501 of the impeller 500.

[0054] Reference Figure 1 , Figure 3 , Figure 9 It is understandable that the stator assembly 300 typically includes components such as stator core 301, insulating frame 302, stator frame 305, enameled wire 303, and pins 304. The stator frame 305 is made of resin-based materials, including but not limited to thermoplastic and thermosetting plastic materials. The stator core 301, insulating frame 302, enameled wire 303, and pins 304 are molded together by the stator frame 305, and a circular positioning ring 306 is formed on the radial outer side of the stator frame 305.

[0055] Reference Figure 9 The stator assembly 300 also integrates the bearing housing 310 and the power cable lead wire into a single molded unit, thereby achieving functional integration and simplifying the parts.

[0056] It should be noted that the rotor assembly 400 can adopt different structural forms. Regardless of the structural form of the rotor assembly 400, as long as it can be combined with the stator assembly 300 to form an external rotor motor 200 and realize the function of the external rotor motor 200, it is acceptable.

[0057] The structure of the rotor assembly 400 is described in detail below through several embodiments.

[0058] Specifically, refer to Figure 1 , Figure 3 It is understood that in some embodiments, the rotor assembly 400 includes a permanent magnet 406, a rotor yoke 407, a rotor frame 401, and a shaft 405. The rotor frame 401 is made of a resin material, including but not limited to thermoplastic and thermosetting plastic materials. The resin material has a predetermined elastic modulus. The permanent magnet 406, the rotor yoke 407, and the shaft 405 are molded together by the rotor frame 401.

[0059] It is understood that in some embodiments, the rotor assembly 400 includes a permanent magnet 406, a rotor frame 401, and a shaft 405. The permanent magnet 406 is of Halbach magnetization type and is integrally molded with the rotor frame 401, which is made of resin-based materials such as thermoplastic or thermosetting plastic materials, and the shaft 405. It should be noted that the Halbach magnetization type permanent magnet 406 is widely used in the industry and will not be described in detail here.

[0060] It is understood that in some embodiments, the rotor assembly 400 includes a permanent magnet 406 and a rotating shaft 405. The permanent magnet 406 can be injection molded (in the form of plastic magnet, generally made by fusing plastic raw materials with ferrite magnetic powder) and then molded together with the rotating shaft 405 to form the rotor frame 401.

[0061] Reference Figure 2 , Figure 4 , Figure 6 , Figure 7 It is understood that, in some embodiments, the first transmission structure includes a plurality of first transmission bosses 402 and a plurality of first grooves 601. The first transmission bosses 402 are disposed on the outer peripheral surface of the rotor frame 401 and extend along the axial direction of the rotor frame 401. The plurality of first transmission bosses 402 are spaced apart. The first grooves 601 are disposed on the inner wall surface of the flexible member 600. The plurality of first grooves 601 are spaced apart. Furthermore, the first transmission bosses 402 and the first grooves 601 are disposed in a one-to-one correspondence. The first transmission bosses 402 are disposed on the corresponding first grooves 601. Through the cooperation of the first transmission bosses 402 and the first grooves 601, the torque transmission between the rotor assembly 400 and the flexible member 600 is realized.

[0062] Reference Figure 2 , Figure 4 , Figure 5 It is understood that in some embodiments, the connector 503 has an annular cylindrical structure, and the second transmission structure includes multiple second transmission bosses 505 and multiple second grooves 603. The second transmission bosses 505 are disposed on the inner wall surface of the connector 503 and extend along the axial direction of the rotor frame 401. The multiple second transmission bosses 505 are spaced apart, and the second grooves 603 are disposed on the outer wall surface of the flexible member 600. The multiple second grooves 603 are spaced apart, and the second transmission bosses 505 and the second grooves 603 correspond one-to-one. The second transmission bosses 505 are disposed on the corresponding second grooves 603. Through the cooperation of the second transmission bosses 505 and the second grooves 603, the torque transmission between the flexible member 600 and the wind turbine 500 is realized.

[0063] It should be noted that the first transmission boss 402 and the first groove 601 can be integrally formed with the rotor assembly 400 or the flexible component 600 during the molding process of the rotor assembly 400 and the flexible component 600. The second transmission boss 505 and the second groove 603 can also be integrally formed with the flexible component 600 or the impeller 500 during the molding process of the flexible component 600 and the impeller 500. Therefore, no additional processing is required, which simplifies the processing procedure.

[0064] It is understandable that the first transmission boss 402 can also be provided on the flexible member 600, and correspondingly, the first groove 601 is provided on the rotor frame 401; similarly, the second transmission boss 505 can be provided on the flexible member 600, and correspondingly, the second groove 603 is provided on the connecting member 503. Using the above-mentioned arrangement, torque transmission between the rotor assembly 400 and the flexible member 600, and between the flexible member 600 and the impeller 500, can also be achieved, and no limitation is made here.

[0065] It should be noted that the connector 503 can also be configured as a strip structure. When the connector 503 is configured as a strip structure, multiple connectors can be configured. Multiple connectors 503 are configured along the circumference of the end of the impeller 500 and extend in a direction away from the impeller 500. The connectors 503 are directly connected to the second groove 603 of the flexible member 600 for transmission. This can also realize the transmission of torque between the flexible member 600 and the impeller 500. No limitation is made here.

[0066] It is understandable that in order to achieve torque transmission between the rotor assembly 400 and the flexible component 600, and between the flexible component 600 and the impeller 500, the flexible component 600 needs to have a certain elastic modulus. Therefore, in some embodiments, the elastic modulus of the rotor frame 401 connected to the flexible component 600 is E1, and the elastic modulus of the connector 503 connected to the flexible component 600 is E2. The elastic modulus of the flexible component 600 is less than or equal to (E1+E2) / 10. That is, the elastic modulus of the flexible component 600 is one order of magnitude smaller than that of the rotor assembly 400 and the impeller 500. This allows the torque to be transmitted to the impeller 500 through the flexible component 600, and also allows the flexible component to be compressed during the process, absorbing the vibration of the rotor assembly 400 and the impeller 500 to achieve a damping effect, thereby reducing the noise of the wind turbine.

[0067] It should be noted that the elastic modulus is an important performance parameter for engineering materials. From a macroscopic perspective, the elastic modulus measures the ability of an object to resist elastic deformation; from a microscopic perspective, it reflects the bond strength between atoms, ions, or molecules. Any factor affecting bond strength can influence the elastic modulus of a material, such as bonding method, crystal structure, chemical composition, microstructure, and temperature. Due to differences in alloy composition, heat treatment state, and cold plastic deformation, the elastic modulus value of metallic materials can fluctuate by 5% or more. However, generally speaking, the elastic modulus of metallic materials is a mechanical property indicator that is insensitive to microstructure. Alloying, heat treatment (microstructure), and cold plastic deformation have relatively small effects on the elastic modulus, and external factors such as temperature and loading rate also have little impact. Therefore, the elastic modulus is generally treated as a constant in engineering applications.

[0068] The modulus of elasticity can be considered an indicator of how easily a material undergoes elastic deformation. The higher the value, the greater the stress required to induce a certain elastic deformation, meaning the material is more stiff and, under a given stress, undergoes less elastic deformation. The modulus of elasticity refers to the stress required for a material to produce a unit elastic deformation under external force. It reflects a material's ability to resist elastic deformation, equivalent to the stiffness of a common spring.

[0069] During the assembly of the outer rotor impeller 500 of the present invention, the flexible component 600 is fitted onto the rotor assembly 400 and assembled with the rotor assembly 400 to form an integrated motor, which is then inserted into the impeller 500. At this time, the flexible component 600 and the rotor assembly 400 form mutual compression to prevent the flexible component 600 from falling off the rotor assembly 400. At the same time, the flexible component 600 and the impeller 500 are in clearance fit to prevent the flexible component 600 from being squeezed on both sides during assembly, so as to facilitate the insertion of the rotor assembly 400.

[0070] The flexible component 600 of the present invention, together with the rotor assembly 400 and the impeller 500, achieves torque transmission through the cooperation of the circumferential concave and convex structure. The structure is simple, easy to process, and has a reliable fit, which can effectively transmit the torque generated by the rotor assembly 400 to the impeller 500.

[0071] Reference Figure 5 , Figure 6 , Figure 7 It is understood that in some embodiments, the first transmission boss 402 and the second transmission boss 505 may adopt a rectangular shape as shown in the figure, and the first groove 601 and the second groove 603 are correspondingly set as rectangles that cooperate with the first transmission boss 402 and the second transmission boss 505.

[0072] It should be noted that the first transmission boss 402 and the second transmission boss 505 may also adopt tooth shape, semi-circular shape, etc. Correspondingly, the first groove 601 and the second groove 603 are set to the shape corresponding to the first transmission boss 402 and the second transmission boss 505, which is not limited here.

[0073] It should be noted that the first and second transmission structures of the present invention can also adopt other structural forms, as long as they are provided between the rotor assembly 400 and the flexible member 600 and between the flexible member 600 and the impeller 500, and can compress the flexible member and transmit the torque generated by the rotor assembly 400 to the impeller 500. In this way, the vibration of the rotor assembly 400 and the impeller 500 can be absorbed through these transmission structures, thereby achieving the effect of shock absorption and reducing the noise of the fan.

[0074] It is understood that in some embodiments, the number of first transmission bosses 402 and first grooves 601 is 2N or 3N, and the number of second transmission bosses 505 and second grooves 603 is 2N or 3N, where N is an integer. By setting the above-mentioned number of first transmission bosses 402 and first grooves 601 and second transmission bosses 505 and second grooves 603, it is beneficial to ensure the torque transmission effect between the rotor assembly 400 and the flexible member 600, and between the flexible member 600 and the impeller 500, thereby ensuring the efficiency of the fan.

[0075] Reference Figure 4 , Figure 6It is understood that in some embodiments, the first groove 601 and the second groove 603 are both provided on the flexible member 600, and a transmission part 604 is formed between adjacent first grooves 601 and second grooves 603, thereby forming multiple transmission parts 604 in the circumference of the flexible member 600. During the operation of the external rotor fan 100, the first transmission boss 402 and the second transmission boss 505 respectively compress the corresponding transmission parts 604, causing the transmission parts 604 to produce a certain elastic deformation, absorbing the vibration of the rotor assembly 400 and the impeller 500, thereby achieving the shock absorption effect. The thickness of the transmission part 604 along the circumference of the flexible member 600 is greater than or equal to 2 mm, which not only helps the flexible member 600 to better absorb the vibration of the rotor assembly 400 and the impeller 500 and achieve the shock absorption effect, but also ensures the torque transmission effect between the rotor assembly 400 and the flexible member 600, and between the flexible member 600 and the impeller 500, thus ensuring the efficiency of the fan.

[0076] Reference Figure 6 It is understood that in some embodiments, the first groove 601 is closed at one end near the impeller 500, thereby forming an axial positioning boss 602 of the flexible member 600 at one end of the first groove 601. When the flexible member 600 is assembled, the axial positioning boss 602 abuts against the side edge of the rotor frame 401, thereby realizing the assembly positioning of the flexible member 600.

[0077] Reference Figure 7 It is understood that, in some embodiments, a receiving groove 404 is formed between two adjacent first transmission bosses 402, and the receiving groove 404 penetrates the outer peripheral surface of the rotor frame 401 along the axial direction of the rotor frame 401. The flexible member 600 forms a protrusion between two adjacent first grooves 601, and the receiving groove 404 is used to accommodate the protrusion to realize the assembly between the flexible member 600 and the rotor frame 401, ensuring that the flexible member 600 can effectively transmit torque.

[0078] It is understood that in some embodiments, a receiving groove 404 is formed between two adjacent first transmission bosses 402. The receiving groove 404 is closed at one end away from the impeller 500, and the other end extends along the axial direction of the rotor frame 401 to the outer peripheral end edge of the rotor frame 401. It should be noted that the outer peripheral end edge of the rotor frame 401 refers to the connection between the outer peripheral surface and the end surface. The other end extending along the axial direction of the rotor frame 401 to the outer peripheral end edge of the rotor frame 401 means that the other end of the receiving groove is a structure that penetrates the outer peripheral surface of the rotor frame. When the receiving groove 404 is closed at one end away from the impeller 500, the length of the receiving groove 404 along the axial direction of the rotor frame 401 is usually set to 3 to 20 mm, which can ensure that the flexible member 600 can effectively realize torque transmission. Furthermore, the fact that the receiving groove 404 is closed at one end away from the impeller 500, that is, connected between two adjacent first transmission bosses 402, is equivalent to providing a reinforcing structure between two adjacent first transmission bosses 402, which can improve the strength of the rotor frame 401.

[0079] Reference Figure 8 It is understood that in some embodiments, the rotor frame 401 is provided with a shaft positioning boss 403. The shaft positioning boss 403 is located on the side of the rotor frame 401 close to the impeller 500, that is, the mating side of the rotor assembly 400 and the impeller 500. The size of the shaft positioning boss 403 is preferably 2mm-10mm. By increasing the axial length of the mating between the shaft 405 and the rotor frame 401, the dimensional accuracy of the rotor frame 401 can be well maintained, and the concentricity of the shaft 405 and the permanent magnet 406 can be well guaranteed.

[0080] Reference Figure 1 , Figure 5 It is understood that the rotor frame 401 is provided with a shaft positioning boss 403, and the end of the impeller 500 near the rotor frame 401 is provided with an end plate 501. The end plate 501 is provided with a clearance hole 502. The clearance hole 502 can avoid the shaft positioning boss 403, thereby avoiding increasing the axial distance between the motor and the impeller 500, that is, avoiding increasing the axial length of the external rotor fan 100, and thus reducing the axial space of the electrical appliances using the external rotor fan 100.

[0081] Reference Figure 1 , Figure 2 , Figure 3 , Figure 10It is understood that in some embodiments, an annular positioning ring 306 is formed on the radially outer side of the stator frame 305. The stator frame 305 is provided with a rubber ring 307, and the rubber ring 307 is provided with a sealing ring 308. The sealing ring 308 extends radially towards the rotating shaft 405 along the rubber ring 307. The rubber ring 307 and the positioning ring 306 are fitted together, so that the rubber ring 307 and the circumferential surface of the stator frame 305 are interference-fitted, and the two form mutual compression, so that the rubber ring 307 is detached from the stator. The rubber ring 307 has the effect of reducing the transmission of vibration of the stator assembly 300 to the whole machine, effectively reducing the overall noise of the fan. The sealing ring 308 abuts against the end edge of the stator frame 305 near the impeller 500. And the motor system of the external rotor fan 100 can be fixed to the air conditioning system through the rubber ring 307.

[0082] Reference Figure 3 , Figure 10 It is understood that in some embodiments, the sealing ring 308 is provided with a protective ear 309, which is inclined towards the impeller 500 along the rotor axis. This forms a preliminary waterproof structure between the protective ear 309 and the connecting member 503. Furthermore, the protective ear 309, the connecting member 503, and the inner wall of the positioning ring 306 of the stator frame 305 together form a labyrinthine waterproof structure to prevent water droplets from entering the motor from the joint between the rubber ring 307 and the impeller 500, thus ensuring the normal operation of the motor. It should be noted that there is a certain gap between the protective ear 309 and the connecting member 503. This gap serves both a waterproof function and can interfere with the operation of the impeller 500.

[0083] It is understood that the rubber ring 307, sealing ring 308 and protective ear 309 can be integrally molded or separately constructed. When separately constructed, the rubber ring 307, sealing ring 308 and protective ear 309 can be fixed together by adhesive or other means. Furthermore, the rubber ring 307, sealing ring 308 and protective ear 309 can be made of shock-absorbing materials such as resin, and there are no restrictions on this.

[0084] An air conditioner according to a second aspect of the present invention includes an external rotor fan 100 according to a first aspect of the present invention.

[0085] The stator assembly 300 and rotor assembly 400 of the present invention are connected as a whole by bearing 311, and together with end cover 313, flexible part 600 and rubber ring 307, they form an integrated external rotor motor 200. The external rotor motor 200 is assembled with the impeller 500 by flexible part 600 and installed in the air conditioner. Therefore, the air conditioner of the present invention has technical advantages such as simple assembly and improved noise of the whole machine.

[0086] Specifically, the air conditioner of the present invention uses a fan in which the rotor assembly 400 and the impeller 500 are connected by a flexible member 600 disposed circumferentially on the rotor frame 401. The torque generated by the rotor assembly 400 is transmitted to the impeller 500 through the flexible member 600. The torque transmission sequence is as follows: the rotor assembly 400 generates electromagnetic torque, which is transmitted to the flexible member 600 through the rotor frame 401, and then to the impeller 500 through the flexible member 600. During this process, the flexible member is compressed and absorbs the vibration of the rotor assembly 400 and the impeller 500 to achieve a shock absorption effect, thereby reducing the noise of the fan and improving the quality of the air conditioner. Furthermore, the flexible component 600 isolates the rotor assembly 400 from the impeller 500 in the radial and axial directions, preventing mutual interference between the rotor assembly 400 and the impeller 500. The external rotor motor 200 and the impeller 500 are connected by the flexible component 600, which facilitates the assembly and disassembly of the external rotor motor 200 and the impeller 500 and is beneficial for the quality control of the motor. At the same time, the rotor assembly 400 and the impeller 500 are connected by the flexible component 600 located circumferentially on the rotor frame 401 and the connector 503 located circumferentially at the end of the impeller 500, which reduces the axial distance between the motor and the impeller 500, thereby reducing the axial space of the air conditioner.

[0087] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. An external rotor fan, characterized in that, include: Stator assembly, including stator frame; The rotor assembly includes a rotor frame and a rotating shaft fixedly disposed on the rotor frame, the rotating shaft being rotatably disposed on the stator frame; A wind turbine, wherein a connecting member is provided circumferentially at the end of the wind turbine, the connecting member extends in a direction away from the wind turbine, and a receiving space is formed between the connecting member and the end of the wind turbine, and the rotor frame is at least partially housed in the receiving space; A flexible component is arranged in a ring along the outer circumferential surface of the rotor frame and located between the rotor frame and the connecting component. A first transmission structure is provided between the flexible component and the rotor frame, and a second transmission structure is provided between the flexible component and the connecting component. The rotor frame is connected to the connecting component through the first transmission structure and the second transmission structure to transmit the torque generated by the rotor assembly to the wind turbine. The first transmission structure includes a plurality of spaced first transmission bosses and a plurality of spaced first grooves. One of the first transmission bosses and the first grooves is arranged along the axial direction of the rotor frame on the outer circumferential surface of the rotor frame, and the other is arranged on the inner wall surface of the flexible component. The first transmission bosses and the first grooves are arranged in a one-to-one correspondence, and the first transmission boss is arranged in the corresponding first groove.

2. The external rotor fan according to claim 1, characterized in that, The connector is annular. The second transmission structure includes a plurality of spaced second transmission bosses and a plurality of spaced second grooves. One of the second transmission bosses and the second grooves is disposed on the inner wall of the connector along the axial direction of the rotor frame, and the other is disposed on the outer wall of the flexible component. The second transmission bosses and the second grooves are disposed in a one-to-one correspondence, and the second transmission bosses are disposed on the corresponding second grooves.

3. The external rotor fan according to claim 2, characterized in that, Both the first groove and the second groove are provided on the flexible member, and a transmission part is formed between adjacent first grooves and second grooves. The thickness of the transmission part along the circumferential direction of the flexible member is greater than or equal to 2 mm.

4. The external rotor fan according to claim 3, characterized in that, A receiving groove is formed between two adjacent first transmission bosses, and the receiving groove extends through the outer peripheral surface of the rotor frame along the axial direction of the rotor frame.

5. The external rotor fan according to claim 3, characterized in that, A receiving groove is formed between two adjacent first transmission bosses. The receiving groove is closed at one end away from the impeller, and the other end extends along the axial direction of the rotor frame to the outer peripheral edge of the rotor frame.

6. The external rotor fan according to claim 3, characterized in that, The first groove is closed at the end near the wind turbine.

7. The external rotor fan according to claim 1, characterized in that, A shaft positioning boss is provided on one side of the rotor frame near the wind turbine.

8. The external rotor fan according to claim 7, characterized in that, An end plate is provided at the end of the wind turbine near the rotor frame, and the end plate is provided with a clearance hole for avoiding the positioning boss of the rotating shaft.

9. The external rotor fan according to claim 1, characterized in that, The elastic modulus of the rotor frame connected to the flexible component is E1, the elastic modulus of the connector connected to the flexible component is E2, and the elastic modulus of the flexible component is less than or equal to (E1+E2) / 10.

10. The external rotor fan according to claim 1, characterized in that, The stator frame is provided with a rubber ring, and the rubber ring is provided with a sealing ring. The sealing ring extends radially toward the rotating shaft along the rubber ring. The rubber ring is interference-fitted with the circumferential surface of the stator frame, and the sealing ring abuts against the end edge of the stator frame near the impeller.

11. The external rotor fan according to claim 10, characterized in that, The sealing ring is provided with a protective ear, which is inclined along the axial direction of the rotor towards the impeller, and a waterproof structure is formed between the protective ear and the connecting member.

12. An air conditioner, characterized in that, Includes the external rotor fan as described in any one of claims 1 to 11.

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