External rotor fan

Abstract

The present invention provides an outer rotor fan, comprising an outer rotor motor body arranged on one side of a base, an electric control unit arranged on the other side of the base, the outer rotor motor body comprising a main shaft and a motor stator sleeved on the main shaft, a rotor assembly arranged outside the motor stator, a cylindrical connecting cover arranged outside the rotor assembly, the inner side wall of the connecting cover is tightly fitted with the rotor assembly, an annular blade seat is sleeved on the outer side wall of the connecting cover, and the connecting cover and the blade seat are fixedly connected in a direction perpendicular to the side wall of the connecting cover. The present invention makes the connection between the connecting cover and the blade seat more secure, further simplifies the assembly process, and saves the production cost of the enterprise. In addition, by forming a 22-pole 18-slot structure, under the same aspect ratio structure, a smaller-sized motor stator and rotor assembly can be used in a narrow scene to output a higher torque and a larger moment of force, and the structure is more compact.

Description

Technical Field

[0001] The invention relates to the field of fans, and in particular to an outer rotor fan. Background Art

[0002] Traditional electric motors have stators on the outside and rotors that rotate to generate power. External rotor motors have the opposite structure, with the stator in the middle of the motor and the rotor on the outside. External rotor fans use an advanced structure in which the external rotor motor directly drives the impeller and a reasonable aerodynamic design, and have the characteristics of high efficiency, low noise, light weight, compact structure, and easy installation and maintenance.

[0003] The invention patent with publication number CN220470259U discloses an improved outer rotor fan, including a base, an oil-containing bearing, a stator assembly, a rotor, and a fan blade assembly. A tubular mounting seat is arranged on the upper side of the base, a magnet is arranged at the bottom of the inner cavity of the mounting seat, the stator assembly is arranged on the outer side of the mounting seat along the circumferential direction, the fan blade assembly includes a blade seat with an opening downward, at least three wind blades are evenly arranged on the outer wall of the blade seat along the circumferential direction, and a metal fan blade shaft is arranged on the lower side of the upper end cover of the blade seat. The beneficial effects are: improving the fan mechanism, reducing the number of bearings, thereby reducing costs; simplifying the installation process and improving production efficiency; using a magnetic structure to ensure that no movement occurs during the operation of the fan.

[0004] However, the above scheme has the following defects. First, the side wall of the rotor is directly connected and fixed to the blade seat in the same direction as the centrifugal force. This fixing method is not affected when the rotor rotates at a low speed and the volume of the wind blades on the rotor and the blade seat is not much different. However, if the rotor needs to rotate at a high speed and the volume of the rotor is very different from the volume of the wind blades on the blade seat, a huge centrifugal force will be generated when the rotor drives the blade seat to rotate, which makes the connection between the rotor and the blade seat unstable (from the material point of view, the rotor and the blade seat cannot be integrally formed), and there is a risk of falling off between the two. Secondly, the number of stages and slots of the outer rotor motor used in the above-mentioned fan cannot meet the requirements of providing sufficient speed and torque in a compact volume in a small space, and the output power and torque are insufficient under high speed conditions. Thirdly, the rotor is directly assembled with the blade seat, and its assembly process is also relatively complicated in the existing process. Finally, since the rotor is directly assembled with the blade seat, the two are tightly fitted without a gap. Due to the material problem of the blade seat, the heat generated when the rotor rotates at a high speed cannot be dissipated even through the blade seat. Summary of the invention

[0005] In order to solve the above problems, the present application provides an outer rotor fan that can meet the requirements of high-speed rotation of the rotor and miniaturization of the rotor, stability of the connection between the rotor and external components, and good heat dissipation. Specifically, it is an outer rotor fan, including an outer rotor motor body arranged on one side of a base, and an electronic control unit is arranged on the other side of the base. The outer rotor motor body includes a main shaft and a motor stator sleeved on the main shaft, 18 tooth crowns extending outward along the outer circumference of the motor stator, the gear is used to wind the coil, and the 18 tooth crowns divide the outer circumference of the motor stator into 18 tooth slots, and stator tooth poles are arranged at the ends of the tooth crowns. A rotor assembly is arranged outside the motor stator, and the rotor assembly includes an integrally formed rotor core and 22 permanent magnets embedded in the rotor core. A cylindrical connecting cover is arranged outside the rotor assembly, and the side wall of the connecting cover is tightly fitted with the rotor assembly. An annular blade seat is sleeved on the outside of the side wall of the connecting cover, and the connecting cover and the blade seat are fixedly connected in a direction perpendicular to the side wall of the connecting cover.

[0006] Furthermore, the connection cover also includes a top surface, on which a first through hole is provided, and when the connection cover is assembled with the rotor assembly, the main shaft is inserted into the first through hole.

[0007] Furthermore, a connecting surface extends outwardly from one end of the side wall away from the top surface, the connecting surface is perpendicular to the side wall and there is a distance between the base, the blade seat includes an inner ring, an outer ring and a connecting groove therebetween, the connecting groove is fixed to the connecting surface in a direction perpendicular to the side wall by a bolt structure.

[0008] Furthermore, the blade seat further includes an inner ring and an outer ring, the inner ring is in contact with the outside of the side wall, and the outside of the outer ring is provided with an integrally formed wind blade.

[0009] Furthermore, a second through hole is provided on the connecting surface, and a first through groove is provided in the connecting groove.

[0010] Furthermore, the rotor assembly and the connecting cover are integrally formed.

[0011] Furthermore, a top cover is provided at one end of the blade seat away from the connecting surface, a second through groove is provided on the connecting groove, and a connecting rod matching the shape of the second through groove is provided on one side of the top cover.

[0012] Furthermore, the connecting rod has inward elasticity.

[0013] Furthermore, a convex point is arranged on the connection groove, and a third through hole matching the shape of the convex point is arranged on the top cover.

[0014] Furthermore, a plurality of convex strips are arranged at preset intervals on the inner ring of the blade seat, and the top cover is arranged with an outward concave shape, so that a gap surrounding the connection cover is formed between the connection cover, the blade seat and the top cover.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] Compared with the prior art, this application:

[0017] 1. Compared with the prior art, in the application scenarios of the present solution, for example, when the outer rotor motor body needs to be miniaturized and rotate at high speed, the rotor assembly in the present solution is connected to the blade seat through a connecting cover, thereby avoiding the direct connection between the rotor assembly and the blade seat, which may affect the rotor assembly. Secondly, the connection between the connecting cover and the blade seat is not that the side wall is connected to the inner wall of the blade seat, but that a connecting surface perpendicular to the side wall of the connecting cover is set between the blade seat to form a fixation in a direction perpendicular to the rotor assembly. In this way, when the rotor assembly rotates at high speed, the connection direction between the connecting cover and the blade seat is perpendicular to the direction of the centrifugal force, which can maximize the avoidance of the influence of the centrifugal force on the connection between the connecting cover and the blade seat, thereby further increasing the stability of the connection between the two.

[0018] 2. Secondly, under the same aspect ratio, in the 22-pole 18-slot structure, the present application can output a higher speed with a smaller motor stator and rotor assembly in a narrow scene, and at the same time, can provide greater output power and better motor efficiency in a high-speed environment.

[0019] 3. Third, during the assembly process, when assembling the present solution, the rotor assembly is connected to the blade seat through the connecting cover. The rotor assembly and the connecting cover can be designed to be integrally formed (due to material compatibility issues in the prior art, it is almost impossible to design the rotor assembly and the blade seat to be integrally formed). In this way, the connecting cover is assembled first, and then the blade seat is assembled on the outside of the connecting cover, and then the two are fixed by screws. In this way, while enhancing the stability of the connection between the blade seat and the connecting cover, it also further simplifies the assembly process and saves the production cost of the enterprise.

[0020] 4. Finally, in this embodiment, the outer rotor motor body will generate heat when it rotates at high speed. This heat will generate wind as the rotor assembly rotates, and will flow out from between the connecting cover and the base, playing a preliminary heat dissipation role. At the same time, the heat will cause the connecting cover to heat up, and the rotor assembly will generate wind. After flowing out from between the connecting cover and the base, a part of it will flow into the gap between the connecting cover and the blade seat and the top cover to form a surrounding connecting cover, thereby further cooling the connecting cover.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 This is an exploded view of the overall structure of the outer rotor fan of the present invention;

[0024] Figure 2 It is a schematic diagram of the assembly structure of the base, the outer rotor motor body and the connection cover of the outer rotor fan of the present invention;

[0025] Figure 3 This is an overall structural diagram of the connection cover of the outer rotor fan of the present invention;

[0026] Figure 4 The overall structural diagram of the blade seat of the outer rotor fan of the present invention;

[0027] Figure 5 The figure is an overall structural diagram of the top cover of the outer rotor fan of the present invention;

[0028] Figure 6 It is a structural schematic diagram of the motor stator and rotor assembly of the external rotor fan of the present invention;

[0029] Figure 7 is a cross-sectional view of the outer rotor fan of the present invention;

[0030] Figure 8 is a performance curve diagram of an outer rotor motor body in the prior art under the working environment of this embodiment;

[0031] Fig. 9 is a performance curve diagram of the outer rotor motor body of the outer rotor fan of the present invention under the working environment of this embodiment;

[0032] The reference numerals and names in the figures are as follows:

[0033] Base 30, outer rotor motor body 10, electronic control unit 20, main shaft 11, motor stator 12, tooth crown 111, tooth slot 112, stator tooth pole 113, rotor assembly 13, rotor core 114, permanent magnet 115, groove 116, connecting cover 100, side wall 110, top surface 120, first through hole 121, connecting surface 130, blade seat 200, inner ring 210, outer ring 220, connecting groove 230, wind blade 221, second through hole 131, first through groove 231, screw 40, top cover 300, second through groove 232, connecting rod 310, protrusion 233, third through hole 320, convex strip 211, gap 50. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The preferred embodiments of the invention will now be further described in conjunction with the accompanying drawings. Figures 1 to 3 As shown, an outer rotor fan comprises an outer rotor motor body 10 arranged on one side of a base 30, an electric control unit 20 is arranged on the other side of the base 30, the outer rotor motor body 10 comprises a main shaft 11 and a motor stator 12 sleeved on the main shaft 11, 18 tooth crowns 111 extending outward along the outer circumference of the motor stator 12, the gear is used to wind a coil (not shown in the figure), the 18 tooth crowns 111 divide the outer circumference of the motor stator 12 into 18 tooth slots 112, stator tooth poles 113 are arranged at the ends of the tooth crowns 111, a rotor assembly 13 is arranged on the outer sleeve of the motor stator 12, the rotor assembly 13 comprises an integrally formed rotor core 114 and 22 permanent magnets 115 embedded in the rotor core 114, the motor stator 12 is electrically connected to the electric control unit 20, and when the motor stator 12 is energized, a magnetic field is generated to drive the rotor assembly 13 to rotate around the motor stator 12.

[0036] Combination Figure 1 and Figure 3 As shown, a cylindrical connection cover 100 is arranged outside the rotor assembly 13, and the connection cover 100 is closely connected to the rotor assembly 13. When the rotor assembly 13 rotates, it will drive the connection cover 100 to rotate synchronously.

[0037] Combination Figure 1 and Figure 3As shown, the connecting cover 100 includes a side wall 110 and a top surface 120. The side wall 110 is tightly fitted with the rotor assembly 13. A first through hole 121 is provided on the top surface 120. When the connecting cover 100 and the rotor assembly 13 are assembled, the main shaft 11 is inserted into the first through hole 121, which can guide the assembly between the connecting cover 100 and the rotor assembly 13.

[0038] Combination Figure 3 and Figure 4 As shown, a connecting surface 130 extends outward from one end of the side wall 110 away from the top surface 120, the connecting surface 130 and the side wall 110 are perpendicular to each other and there is a distance between the base 30, and an annular blade seat 200 is sleeved on the outside of the side wall 110 of the connecting cover 100, and the blade seat 200 includes an inner ring 210, an outer ring 220 and a connecting groove 230 therebetween, the inner ring 210 fits with the side wall 110, and an integrally formed wind blade 221 is arranged on the outside of the outer ring 220, when the blade seat 200 and the connecting cover 100 are assembled, the inner ring 210 fits with the side wall 110, and the connecting groove 230 is fixed to the connecting surface 130 in a direction perpendicular to the side wall 110 by a bolt structure, thereby fixing the blade seat 200 and the connecting cover 100 in a direction perpendicular to the rotor assembly 13.

[0039] In this way, in the application scenario of the present solution, for example, when the outer rotor motor body 10 needs to be miniaturized and rotate at high speed, the rotor assembly 13 in the present solution is connected to the blade seat 200 through the connecting cover 100, thereby avoiding the direct connection between the rotor assembly 13 and the blade seat 200, which may affect the rotor assembly 13. Secondly, the connection between the connecting cover 100 and the blade seat 200 is not the connection between the side wall 110 and the inner wall of the blade seat 200, but through the connection surface 130 perpendicular to the side wall 110 of the connecting cover 100 and the blade seat 200, so as to form a fixation in a direction perpendicular to the rotor assembly 13. In this way, when the rotor assembly 13 rotates at high speed, since the connection direction between the connecting cover 100 and the blade seat 200 is perpendicular to the direction of the centrifugal force, the influence of the centrifugal force on the connection between the connecting cover 100 and the blade seat 200 can be avoided to the greatest extent, thereby further increasing the stability of the connection between the two.

[0040] The present application forms a 22-pole 18-slot structure by designing 22 permanent magnets 115 and 18 tooth slots 112. Therefore, under the structure with the same aspect ratio, the present application can output a higher speed to the outside with a smaller-sized motor stator 12 and rotor assembly 13 in a narrow scene. At the same time, in a high-speed environment, it can provide greater output power and better motor efficiency. It should be noted that the aspect ratio mentioned here refers to the ratio between the thickness and the end face diameter of the entire motor stator 12 and rotor assembly 13 after assembly. In the field targeted by the present application, in a narrow application scenario, the 22-pole 18-slot structure can be designed into a flatter structure, and can provide greater output power and better motor efficiency. Figure 8 and Fig. 9 To further elaborate on the above effects, Figure 8 for Fig. 9 They are respectively the performance curve diagram of the outer rotor motor body in the prior art under the working environment of the present embodiment and the performance curve diagram of the outer rotor motor body in the working environment of the present application, wherein the reference symbol A represents the speed (RSpeed), the reference symbol B represents the input current (InputDCCurrent), the reference symbol C represents the motor efficiency (Efficiency), and the reference symbol D represents the output power (OutputPower). By comparison Figure 8 for Fig. 9 It can be seen that at high speeds (speeds above 1000), the 22-pole 18-slot structure of the present application can provide higher output power and better working efficiency compared to the prior art. At the same time, at ultra-high speeds (speeds above 1500), it can still maintain the above-mentioned advantages in output power and working efficiency.

[0041] Combination Figure 3 and Figure 4 As shown, a second through hole 131 is provided on the connecting surface 130, and a first through groove 231 is provided in the connecting groove 230. When the blade seat 200 and the connecting cover 100 are assembled, the first through groove 231 is aligned with the second through hole 131, and then the screw 40 is passed through the first through groove 231 and the second through hole 131 to fix the blade seat 200 and the connecting cover 100.

[0042] From the above assembly process, it can be seen that when assembling this solution, the rotor assembly 13 is connected to the blade seat 200 through the connecting cover 100, and the rotor assembly 13 and the connecting cover 100 can be designed to be integrally formed (due to material compatibility issues in the prior art, it is almost impossible to design the rotor assembly 13 and the blade seat 200 to be integrally formed). In this way, the connecting cover 100 is assembled first, and then the blade seat 200 is assembled on the outside of the connecting cover 100, and then the two are fixed together using the screw 40. In this way, while enhancing the stability of the connection between the blade seat 200 and the connecting cover 100, it also further simplifies the assembly process and saves the company's production costs.

[0043] Furthermore, if Figure 5 As shown, a top cover 300 is further provided at the end of the blade seat 200 away from the connecting surface 130, and the top cover 300 is fixedly connected to the blade seat 200 by a snap. Specifically, a second through groove 232 is further provided on the connecting groove 230, and a connecting rod 310 matching the shape of the second through groove 232 is provided on one side of the top cover 300. When the top cover 300 needs to be installed on the blade seat 200, it is only necessary to align the connecting rod 310 with the second through groove 232 and insert it. Preferably, the connecting rod 310 has a certain inward elasticity, so that when the connecting rod 310 is inserted into the second through groove 232, it can be better clamped inside the second through groove 232.

[0044] Furthermore, a protrusion 233 is also provided on the connecting groove 230, and a third through hole 320 matching the shape of the protrusion 233 is provided on the top cover 300. When the top cover 300 is installed on the blade seat 200, the protrusion 233 is inserted into the third through hole 320, so as to better cooperate with the connecting rod 310 to limit the top cover 300 on the circumferential surface, thereby better preventing the top cover 300 from falling off the blade seat 200 when rotating.

[0045] Combination Figure 1 As shown, the top cover 300 completely covers the end of the blade seat 200 away from the connecting surface 130 , so as to prevent water vapor or other impurities from invading from one end of the blade seat 200 and affecting the rotation of the rotor assembly 13 .

[0046] Furthermore, if Figure 6 As shown, a plurality of grooves 116 are provided inside the rotor core 114 at preset intervals, and the permanent magnets 115 are installed in the grooves 116 by interference fit. Compared with the existing structure in which a hole is opened inside the rotor core 114 and then the permanent magnets 115 are inserted, the processing of the rotor core 114 can be reduced, thereby improving production efficiency and reducing the waste of core materials.

[0047] Combination Figure 1 and Figure 7 As shown, preferably, a plurality of convex strips 211 are arranged at preset intervals on the inner ring 210 of the blade seat 200, so that when the inner ring 210 of the blade seat 200 is in contact with the connecting cover 100, a gap 50 is generated between the inner ring 210 and the connecting cover 100, thereby facilitating the flow of air, and the top cover 300 is provided with an outer concave shape, so that after the top cover 300 is installed in place, there may also be a gap 50 between the connecting cover 100 and the top cover 300, and at the same time, since the blade seat 200 and the connecting surface 130 are connected by a bolt structure, the distance between the blade seat 200 and the connecting surface 130 is also adjustable, and when there is a distance between the blade seat 200 and the connecting surface 130, a gap 50 surrounding the connecting cover 100 is formed between the connecting cover 100, the blade seat 200 and the top cover 300, and at the same time, since the connecting surface 130 is perpendicular to the side wall 110 and there is a distance between the base 30, in this embodiment, the outer rotor motor When the main body 10 rotates at high speed, heat will be generated. The heat will be accompanied by the rotation of the rotor assembly 13 to generate wind, which will flow out from between the connecting cover 100 and the base 30, playing a preliminary heat dissipation role. At the same time, the heat will cause the connecting cover 100 to heat up, and the rotor assembly 13 will rotate to generate wind. After flowing out from between the connecting cover 100 and the base 30, a part of it will flow into the gap 50 formed between the connecting cover 100 and the blade seat 200 and the top cover 300 to surround the connecting cover 100. Therefore, in the narrow environment used in this embodiment, the connecting cover 100 can be further cooled, thereby further improving the heat dissipation effect of the outer rotor motor body 10. It should be noted that in the case of this embodiment, the function of the connecting surface 130 is not only to provide a blade seat 200 for vertical connection, but also the distance between the connecting surface 130 and the blade seat 200 is adjustable, so the connecting surface 130 also helps the connecting cover 100 to dissipate heat.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. External rotor fan, characterized in that: The invention comprises an outer rotor motor body (10) arranged on one side of a base (30), an electric control unit (20) being arranged on the other side of the base (30), the outer rotor motor body (10) comprising a main shaft (11) and a motor stator (12) sleeved on the main shaft (11), 18 tooth crowns (111) extending outwardly along the outer circumference of the motor stator (12), the 18 tooth crowns (111) dividing the outer circumference of the motor stator (12) into 18 tooth slots (112), a stator tooth pole (113) being arranged at the end of the tooth crown (111), and a stator tooth pole (113) being arranged at the end of the motor stator. The rotor assembly (13) is provided on the outer shell of the rotor (12), the rotor assembly (13) comprising an integrally formed rotor core (114) and 22 permanent magnets (115) embedded in the rotor core (114); a cylindrical connecting cover (100) is provided outside the rotor assembly (13); the inner side wall (110) of the connecting cover (100) is tightly fitted with the rotor assembly (13); an annular blade seat (200) is sleeved on the outer side wall (110) of the connecting cover (100); a connection between the connecting cover (100) and the blade seat (200) is perpendicular to the connection cover ( The connecting cover (100) is fixedly connected in the direction of the side wall (110) of the connecting cover (100), the connecting cover (100) further includes a top surface (120), a first through hole (121) is arranged on the top surface (120), when the connecting cover (100) and the rotor assembly (13) are assembled, the main shaft (11) is inserted into the first through hole (121), a connecting surface (130) is extended outwardly at one end of the side wall (110) away from the top surface (120), the connecting surface (130) and the side wall (110) are perpendicular to each other and there is a distance between the base (30), the blade seat (200) includes an inner ring (21 0), an outer ring (220) and a connecting groove (230) therebetween, the connecting groove (230) being fixed to the connecting surface (130) in a direction perpendicular to the side wall (110) by a bolt structure, the blade seat (200) further comprising an inner ring (210) and an outer ring (220), the inner ring (210) being in contact with the outside of the side wall (110), an integrally formed wind blade (221) being arranged on the outside of the outer ring (220), a second through hole (131) being arranged on the connecting surface (130), and a first through groove (231) being arranged in the connecting groove (230).

2. The outer rotor fan according to claim 1, characterized in that: The rotor assembly (13) and the connection cover (100) are integrally formed.

3. The outer rotor fan according to claim 1, characterized in that: A top cover (300) is also provided at one end of the blade seat (200) away from the connecting surface (130), a second through groove (232) is also provided on the connecting groove (230), and a connecting rod (310) matching the shape of the second through groove (232) is provided on one side of the top cover (300).

4. The outer rotor fan according to claim 3, characterized in that: The connecting rod (310) has inward elasticity, and a convex point (233) is also provided on the connecting groove (230), and a third through hole (320) matching the shape of the convex point (233) is provided on the top cover (300).

5. The outer rotor fan according to claim 1, characterized in that: A plurality of grooves (116) are arranged at preset intervals on the inner side of the rotor core (114), and the permanent magnets (115) are installed in the grooves (116) by interference fit.

6. The outer rotor fan according to claim 4, characterized in that: A plurality of convex strips (211) are arranged at preset intervals on the inner ring (210) of the blade seat (200), and the top cover (300) is provided with an outer concave shape, so that a gap (50) surrounding the connection cover (100) is formed between the connection cover (100), the blade seat (200) and the top cover (300).

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