Outer rotor fan

Abstract

The present invention provides an outer rotor fan, comprising an outer rotor motor body disposed on one side of a base. An electronic control unit is provided on the other side of the base; the outer rotor motor body comprises a main shaft and a motor stator sleeved on the main shaft; a rotor assembly is sleeved outside the motor stator; a cylindrical connecting cover is provided outside the rotor assembly; the side wall of the connecting cover is internally tightly attached to the rotor assembly; an annular blade seat is sleeved outside the side wall of the connecting cover; and the connecting cover and the blade seat are fixedly connected in the direction perpendicular to the side wall of the connecting cover. In the present invention, the connection between the connecting cover and the blade seat is firmer, the assembly process is further simplified, and the production cost of an enterprise is reduced; in addition, by forming a 22-pole 18-slot structure, under the structure having a same length-to-diameter ratio, higher moment and larger torque are output outwards in a narrow environment by the motor stator and the rotor assembly each having a smaller size, and the structure is more compact.

Description

Outer rotor fan TECHNICAL FIELD

[0001] The present application relates to the field of fan, in particular to an outer rotor fan. BACKGROUND

[0002] The traditional motor is that the stator is outside and the rotor rotates to generate power. The outer rotor motor is the opposite structure, the stator is in the middle of the motor, and the rotor is outside. The outer rotor fan adopts the advanced structure of the outer rotor motor directly driving the impeller and the reasonable aerodynamic design, and has the characteristics of high efficiency, low noise, light weight, compact structure, easy installation and maintenance, etc.

[0003] The patent for invention with publication number CN220470259U discloses an improved outer rotor fan, which comprises a base, an oil-containing bearing, a stator assembly, a rotor, and a fan blade assembly. The upper side of the base is provided with a tubular mounting seat, the bottom of the inner cavity of the mounting seat is provided with a magnet, the stator assembly is arranged on the outer side of the mounting seat in the circumferential direction, and the fan blade assembly comprises an open downward blade seat, the outer wall of the blade seat is uniformly provided with at least three fan blades in the circumferential direction, and the lower side of the upper end cover of the blade seat is provided with a metal fan blade shaft. The beneficial effects are: the fan mechanism is improved, the number of bearings is reduced, thereby reducing the cost; the installation process is simplified, and the production efficiency is improved; the magnetic attraction structure is used to ensure that the fan does not produce movement during operation.

[0004] However, the above-mentioned scheme has the following defects: first, the side wall of the rotor is directly connected and fixed with the blade seat in the same direction of the centrifugal force. This fixing method is not affected when the rotor rotates at low speed and the volume of the rotor is not much different from that of the fan blades on the blade seat. However, if the rotor needs to rotate at high speed and the volume of the rotor is much different from that of the fan blades on the blade seat, the rotor will generate a great centrifugal force when driving the blade seat to rotate, which causes the connection between the rotor and the blade seat to be unstable (the rotor and the blade seat cannot be integrally formed from the material point of view), and there is a risk of separation between the two; second, the outer rotor motor used in the above-mentioned fan cannot meet the requirements of providing sufficient rotating speed and torque in a compact volume in a narrow space, and the output power and torque are insufficient under high rotating speed; third, the rotor is directly assembled with the blade seat, and the assembly process is relatively complex in the existing process; finally, since the rotor is directly assembled with the blade seat, there is no gap between the two, and due to the material problem of the blade seat, heat generated by the rotor when rotating at high speed cannot be dissipated through the blade seat.

[0005] SUMMARY

[0006] In order to solve the above problems, the application provides an outer rotor fan which can meet the stability of the connection between the rotor and the external components and good heat dissipation on the basis of high-speed rotation of the rotor and miniaturization of the rotor. Specifically, the outer rotor fan comprises 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, a motor stator sleeved on the main shaft, 18 tooth crowns extending outward along the outer circumference of the motor stator, the tooth gears being used for winding coils, the 18 tooth crowns dividing the outer circumference of the motor stator into 18 tooth grooves, stator tooth poles arranged at the ends of the tooth crowns, a rotor assembly arranged outside the motor stator, the rotor assembly comprising an integrally formed rotor core and 22 permanent magnets embedded in the rotor core, a cylindrical connecting cover arranged outside the rotor assembly, the side wall of the connecting cover being tightly fitted with the rotor assembly, an annular blade seat being arranged outside the side wall of the connecting cover, and the connecting cover and the blade seat being fixedly connected in a direction perpendicular to the side wall of the connecting cover.

[0007] Further, the connecting cover further comprises a top surface, a first through hole being arranged on the top surface, and the main shaft being inserted into the first through hole when the connecting cover is assembled with the rotor assembly.

[0008] Further, a connecting surface extends outward from one end of the side wall away from the top surface, the connecting surface being perpendicular to the side wall and having a distance from the base, the blade seat comprising an inner ring, an outer ring, and a connecting groove between the inner ring and the outer ring, the connecting groove being fixedly connected with the connecting surface in a direction perpendicular to the side wall by a bolt structure.

[0009] Further, the blade seat further comprises an inner ring and an outer ring, the inner ring being tightly fitted with the outside of the side wall, and the outer ring being provided with integrally formed fan blades on the outside thereof.

[0010] Further, a second through hole is arranged on the connecting surface, and a first through groove is arranged in the connecting groove.

[0011] Further, the rotor assembly and the connecting cover are integrally formed.

[0012] Further, a top cover is further arranged at one end of the blade seat away from the connecting surface, a second through groove is further arranged on the connecting groove, and a connecting rod is arranged on one side of the top cover and cooperates with the second through groove.

[0013] Further, the connecting rod has inward elasticity.

[0014] Further, a convex point is further arranged on the connecting groove, and a third through hole is arranged on the top cover and cooperates with the convex point.

[0015] Further, the inner ring of the blade seat is provided with a plurality of protrusions arranged at preset intervals, and the top cover is provided with an outer concave shape, thereby forming a gap around the connecting cover between the connecting cover and the blade seat and the top cover.

[0016] Compared with the prior art, the application has the following beneficial effects:

[0017] Compared with the prior art, the application has the following beneficial effects:

[0018] 1. Compared with the prior art, in the application scenario of the present application, for example, the outer rotor motor body needs to be miniaturized and rotated at high speed, the rotor assembly in the present application is connected to the blade seat through the connecting cover, thereby avoiding the influence of the direct connection of the rotor assembly and the blade seat on the rotor assembly, and secondly, the connection between the connecting cover and the blade seat is not the connection of the side wall and the inner wall of the blade seat, but the connection between the connecting surface perpendicular to the side wall of the connecting cover and the blade seat, thereby forming a fixation in a direction perpendicular to the rotor assembly, so that when the rotor assembly rotates at high speed, since the connection direction of the connecting cover and the blade seat is perpendicular to the direction of the centrifugal force, the influence of the centrifugal force on the connection between the connecting cover and the blade seat can be maximally avoided, thereby further increasing the stability of the connection between the two.

[0019] 2. Secondly, in the structure of 22-pole 18-slot, under the same length-diameter ratio, the application can output higher rotational speed of the motor stator and rotor assembly in a small space, and can provide greater output power and better motor efficiency in a high-speed environment.

[0020] 3. Thirdly, in the assembly process, when the present application is assembled, the rotor assembly is connected to the blade seat through the connecting cover, and the rotor assembly and the connecting cover can be designed as an integral molding (in the prior art, due to the material compatibility problem, it is almost impossible to design the rotor assembly and the blade seat as an integral molding), so that the connecting cover is assembled first, then the blade seat is assembled outside the connecting cover, and then the two are fixed by using a screw rod, thereby further simplifying the assembly process and saving the production cost of the enterprise while enhancing the stability of the connection between the blade seat and the connecting cover.

[0021] 4. Finally, in the present embodiment, when the outer rotor motor body rotates at high speed, heat will be generated, and the wind generated by the rotation of the rotor assembly will flow out from between the connecting cover and the base, thereby playing a preliminary heat dissipation role, and since the heat will cause the connecting cover to heat up, and the wind generated by the rotation of the rotor assembly will flow out from between the connecting cover and the base and then flow into the gap around the connecting cover between the connecting cover, the blade seat and the top cover, thereby further playing a heat dissipation role on the connecting cover.

[0022] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and the description or be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0024] Fig. 1 is an overall structure exploded view of the outer rotor fan of the present application;

[0025] Fig. 2 is an assembly structure schematic view of the base, the outer rotor motor body and the connecting cover of the outer rotor fan of the present application;

[0026] Fig. 3 is an overall structure view of the connecting cover of the outer rotor fan of the present application;

[0027] Fig. 4 is an overall structure view of the blade seat of the outer rotor fan of the present application;

[0028] Fig. 5 is an overall structure view of the top cover of the outer rotor fan of the present application;

[0029] Fig. 6 is a structure schematic view of the motor stator and rotor assembly of the outer rotor fan of the present application;

[0030] Fig. 7 is a sectional view of the outer rotor fan of the present application;

[0031] Fig. 8 is a performance curve diagram of the outer rotor motor body in the prior art under the working environment of the present embodiment;

[0032] Fig. 9 is a performance curve diagram of the outer rotor motor body of the outer rotor fan of the present application under the working environment of the present embodiment;

[0033] The reference signs and names in the drawings are as follows: base 30, outer rotor motor body 10, electric control unit 20, main shaft 11, motor stator 12, tooth crown 111, tooth slot 112, stator tooth pole 113, rotor assembly 13, rotor iron core 114, permanent magnet 115, recess 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 slot 230, fan blade 221, second through hole 131, first through slot 231, screw rod 40, top cover 300, second through slot 232, connecting rod 310, convex point 233, third through hole 320, convex strip 211, gap 50. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0035] The preferred embodiments of the application will be further described in conjunction with the accompanying drawings, as shown in FIGS. 1-3, an outer rotor fan, comprising an outer rotor motor body 10 arranged on one side of a base 30, and an electric control unit 20 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 toothed crowns 111 extending outward along the outer circumference of the motor stator 12, the toothed crowns 111 being used for winding coils (not shown in the figure), the 18 toothed crowns 111 dividing the outer circumference of the motor stator 12 into 18 tooth grooves 112, a stator tooth pole 113 being arranged at the end of the toothed crown 111, a rotor assembly 13 being sleeved outside the motor stator 12, the rotor assembly 13 comprising an integrally formed rotor core 114 and 22 permanent magnets 115 embedded in the rotor core 114, the motor stator 12 being electrically connected with the electric control unit 20, a magnetic field being generated after the motor stator 12 is electrified, and the rotor assembly 13 being driven to rotate around the motor stator 12.

[0036] As shown in FIGS. 1 and 3, a cylindrical connecting cover 100 is arranged outside the rotor assembly 13, the connecting cover 100 being closely connected with the rotor assembly 13, and the connecting cover 100 being driven to rotate synchronously when the rotor assembly 13 rotates.

[0037] As shown in FIGS. 1 and 3, the connecting cover 100 comprises a side wall 110 and a top surface 120, the side wall 110 being closely attached to the rotor assembly 13, and a first through hole 121 being arranged on the top surface 120, the main shaft 11 being inserted into the first through hole 121 when the connecting cover 100 is assembled with the rotor assembly 13, so that the assembly of the connecting cover 100 and the rotor assembly 13 is guided.

[0038] As shown in FIG. 3 and FIG. 4, the connecting surface 130 extends outwardly from the end of the side wall 110 away from the top surface 120, and the connecting surface 130 is perpendicular to the side wall 110 and has a distance from the base 30. The annular blade seat 200 is arranged on the outside of the side wall 110 of the connecting cover 100. The blade seat 200 includes an inner ring 210, an outer ring 220, and a connecting groove 230 between the inner ring 210 and the outer ring 220. The inner ring 210 is in close contact with the side wall 110. The outer ring 220 is provided with an integrally formed fan blade 221. When the blade seat 200 is assembled with the connecting cover 100, the inner ring 210 is in close contact with the side wall 110, and the connecting groove 230 is fixed to the connecting surface 130 by a bolt structure in a direction perpendicular to the side wall 110, thereby fixing the blade seat 200 and the connecting cover 100 in a direction perpendicular to the rotor assembly 13.

[0039] In the application scenario of the present scheme, for example, the outer rotor motor body 10 needs to be miniaturized and rotated at high speed. The rotor assembly 13 in the present scheme is connected to the blade seat 200 through the connecting cover 100, which avoids the influence of the direct connection of the rotor assembly 13 and the blade seat 200 on the rotor assembly 13. In addition, the connection between the connecting cover 100 and the blade seat 200 is not the connection of the side wall 110 and the inner wall of the blade seat 200, but the connection between the connecting surface 130 perpendicular to the side wall 110 of the connecting cover 100 and the blade seat 200, which forms a fixed direction perpendicular to the rotor assembly 13. When the rotor assembly 13 rotates at high speed, the connection direction of the connecting cover 100 and the blade seat 200 is perpendicular to the direction of the centrifugal force, which can maximize the influence of the centrifugal force on the connection between the connecting cover 100 and the blade seat 200, thereby further increasing the stability of the connection between the two.

[0040] The application forms a 22-pole 18-slot structure by designing 22 permanent magnets 115 and 18 tooth slots 112, so that in the same length-diameter ratio structure, the application can output higher rotating speed outside with smaller size of motor stator 12 and rotor assembly 13 in a narrow scene, and can provide greater output power and better motor efficiency in a high rotating speed environment. It should be noted that the length-diameter ratio here refers to the ratio between the thickness and the end face diameter of the assembled motor stator 12 and rotor assembly 13. In the field to which the application is directed, the 22-pole 18-slot structure can be designed to be more flat in a narrow application scene, and can provide greater output power and better motor efficiency. The above effects are further described in combination with FIGS. 8 and 9. FIG. 8 is a performance curve diagram of an outer rotor motor body in the working environment of the prior art, and FIG. 9 is a performance curve diagram of an outer rotor motor body in the working environment of the application. In the diagrams, reference sign A represents rotating speed (RSpeed), reference sign B represents input current (InputDCCurrent), reference sign C represents motor efficiency (Efficiency), and reference sign D represents output power (OutputPower). As can be seen from the comparison between FIG. 8 and FIG. 9, in a high rotating speed (above 1000), the 22-pole 18-slot structure of the application can provide higher output power and better working efficiency, and in an ultra-high rotating speed (above 1500), the advantages in output power and working efficiency can still be maintained.

[0041] In combination with FIGS. 3 and 4, the connecting surface 130 is provided with a second through hole 131, and the connecting groove 230 is provided with a first through groove 231. When the blade seat 200 is assembled with the connecting cover 100, the first through groove 231 is aligned with the second through hole 131, and then the screw rod 40 is passed through the first through groove 231 and the second through hole 131 to fix and connect the blade seat 200 and the connecting cover 100.

[0042] As can be seen from the above assembly process, when the application is assembled, the rotor assembly 13 is connected with the blade seat 200 through the connecting cover 100. The rotor assembly 13 and the connecting cover 100 can be designed to be integrally formed (in the prior art, the rotor assembly 13 and the blade seat 200 cannot be designed to be integrally formed due to material compatibility). The connecting cover 100 is assembled first, and then the blade seat 200 is assembled outside the connecting cover 100. The two are fixed by the screw rod 40, and the assembly is completed. In this way, the stability of the connection between the blade seat 200 and the connecting cover 100 is enhanced, and the assembly process is further simplified, thereby saving the production cost of the enterprise.

[0043] Further, as shown in Fig. 5, a top cover 300 is arranged at the end of the vane seat 200 away from the connecting surface 130, and the top cover 300 is connected to the vane seat 200 by snap fixing. Specifically, a second through slot 232 is arranged on the connecting groove 230, and a connecting rod 310 is arranged on one side of the top cover 300 and cooperates with the second through slot 232. When the top cover 300 is to be installed on the vane seat 200, the connecting rod 310 is only needed to be inserted into the second through slot 232. Preferably, the connecting rod 310 has a certain inward elasticity, so that the connecting rod 310 can be better clamped in the second through slot 232 after being inserted into the second through slot 232.

[0044] Further, a convex point 233 is arranged on the connecting groove 230, and a third through hole 320 is arranged on the top cover 300 and cooperates with the convex point 233. When the top cover 300 is installed on the vane seat 200, the convex point 233 is inserted into the third through hole 320, so that the top cover 300 is limited on the circumferential surface by the connecting rod 310, thereby better avoiding the top cover 300 from falling off the vane seat 200 during rotation.

[0045] As shown in Fig. 1, the top cover 300 completely covers the end of the vane seat 200 away from the connecting surface 130, so that water vapor or other impurities can be prevented from invading from the end of the vane seat 200, thereby affecting the rotation of the rotor assembly 13.

[0046] Further, as shown in Fig. 6, a plurality of recesses 116 are arranged in the rotor core 114 at predetermined intervals, and the permanent magnet 115 is installed in the recess 116 by interference fit. Compared with the structure in which a hole is opened in the rotor core 114 and then the permanent magnet 115 is inserted, the processing of the rotor core 114 can be reduced, thereby improving the production efficiency and reducing the waste of core material.

[0047] As shown in FIG. 1 and FIG. 7, preferably, a plurality of protrusions 211 are arranged on the inner ring 210 of the vane seat 200 at preset intervals, so that when the inner ring 210 of the vane seat 200 is attached to the connecting cover 100, a gap 50 is formed between the inner ring 210 and the connecting cover 100, thereby facilitating air flow. The top cover 300 is provided with an outer concave shape, so that after the top cover 300 is installed in place, a gap 50 can also exist between the connecting cover 100 and the top cover 300. Since the vane seat 200 and the connecting surface 130 are connected by a bolt structure, the distance between the vane seat 200 and the connecting surface 130 is also adjustable. When the vane seat 200 and the connecting surface 130 also have a distance, a gap 50 around the connecting cover 100 is formed between the connecting cover 100 and the vane seat 200 and the top cover 300. Since the connecting surface 130 is perpendicular to the side wall 110 and there is a distance between the base 30, in this embodiment, heat is generated when the outer rotor motor body 10 rotates at high speed, and the wind generated by the rotation of the rotor assembly 13 will flow out from the gap between the connecting cover 100 and the base 30, thereby playing a preliminary role in heat dissipation. Since heat causes the connecting cover 100 to heat up, and the wind generated by the rotation of the rotor assembly 13 flows out from the gap between the connecting cover 100 and the base 30, a portion of the wind will flow into the gap 50 around the connecting cover 100 formed between the connecting cover 100 and the vane seat 200 and the top cover 300, thereby further improving the heat dissipation effect of the connecting cover 100 in the narrow environment of this embodiment, thereby further improving the heat dissipation effect of the outer rotor motor body 10. It should be noted that in this embodiment, the connecting surface 130 not only provides a vertical connection for the vane seat 200, but also the distance between the connecting surface 130 and the vane seat 200 is adjustable, so the connecting surface 130 also helps the connecting cover 100 dissipate heat.

[0048] It is apparent for those skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to include all changes falling within the meaning and range of equivalents of the claims.

Claims

1. An external rotor fan, characterized by, The application relates to an outer rotor motor body (10) arranged on one side of a base (30), an electric control unit (20) 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 outward along the outer periphery of the motor stator (12), the 18 tooth crowns (111) dividing the outer periphery of the motor stator (12) into 18 tooth grooves (112), stator tooth poles (113) arranged at the ends of the tooth crowns (111), a rotor assembly (13) sleeved on the motor stator (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) arranged outside the rotor assembly (13), the side wall (110) of the connecting cover (100) being tightly combined with the rotor assembly (13), an annular blade seat (200) arranged on the side wall (110) of the connecting cover (100), and the connecting cover (100) and the blade seat (200) being fixedly connected in the direction perpendicular to the side wall (110) of the connecting cover (100).

2. The outer rotor fan according to claim 1, characterized in that The connecting cover (100) further comprises a top surface (120), a first through hole (121) is arranged on the top surface (120), and the main shaft (11) is inserted into the first through hole (121) when the connecting cover (100) is assembled with the rotor assembly (13).

3. The outer rotor fan according to claim 2, characterized in that A connecting surface (130) extends outward at the end of the side wall (110) away from the top surface (120), the connecting surface (130) is perpendicular to the side wall (110) and has a distance from the base (30), the blade seat (200) comprises an inner ring (210), an outer ring (220) and a connecting groove (230) between the inner ring (210) and the outer ring (220), the connecting groove (230) is fixedly connected with the connecting surface (130) through a bolt structure in the direction perpendicular to the side wall (110).

4. The outer rotor fan according to claim 3, characterized in that The blade seat (200) further comprises the inner ring (210) and the outer ring (220), the inner ring (210) is combined with the outside of the side wall (110), and the outer ring (220) is externally provided with integrally-formed fan blades (221).

5. The outer rotor fan according to claim 3, characterized in that A second through hole (131) is arranged on the connecting surface (130), and a first through groove (231) is arranged in the connecting groove (230).

6. The outer rotor fan according to claim 5, characterized in that The rotor assembly (13) and the connecting cover (100) are integrally formed.

7. The outer rotor fan according to claim 4, characterized in that A top cover (300) is further arranged at the end of the blade seat (200) away from the connecting surface (130), a second through groove (232) is further arranged on the connecting groove (230), and a connecting rod (310) is arranged on one side of the top cover (300) and matched with the type of the second through groove (232).

8. The outer rotor fan according to claim 7, characterized in that The connecting rod (310) has inward elasticity, a convex point (233) is further arranged on the connecting groove (230), and a third through hole (320) is arranged on the top cover (300) and matched with the shape of the convex point (233).

9. The external rotor fan of claim 1, wherein A plurality of recesses (116) are arranged at preset intervals on the inner side of the rotor core (114), and the permanent magnet (115) is installed in the recess (116) by interference fit.

10. The outer rotor fan according to claim 7, 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 type, forming a gap (50) around the connecting cover (100) between the connecting cover (100) and the blade seat (200) and the top cover (300).

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