CN118487403B

CN118487403B - Outer rotor fan

Info

Publication number: CN118487403B
Application number: CN202410642775.2A
Authority: CN
Inventors: 陈亮; 许海波; 钱志存; 朱银; 金洪平
Original assignee: Hangzhou Kangbade Electric Motor Co ltd
Current assignee: Hangzhou Kangbade Electric Motor Co ltd
Priority date: 2024-05-23
Filing date: 2024-05-23
Publication date: 2024-12-27
Anticipated expiration: 2044-05-23
Also published as: CN118487403A

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

Outer rotor fan

Technical Field

The invention relates to the field of fans, in particular to an outer rotor fan.

Background

The traditional motor is characterized in that a stator is outside, and a rotor rotates to generate power. The outer rotor motor is of an opposite structure, the stator is arranged in the middle of the motor, and the rotor is arranged outside. The outer rotor fan adopts an advanced structure and reasonable pneumatic design of directly driving the impeller by an outer rotor motor, and has the characteristics of high efficiency, low noise, light weight, compact structure, convenient installation and maintenance and the like.

The invention patent of publication No. CN220470259U discloses an improved external rotor fan, which comprises a base, an oil-containing bearing, a stator assembly, a rotor and a fan blade assembly, wherein a tubular mounting seat is arranged on the upper side of the base, a magnet is arranged at the bottom of an 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 comprises a blade seat with a downward opening, at least three fan blades are uniformly 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 an upper end cover of the blade seat.

However, the above scheme has the following defects that firstly, the side wall of the rotor is directly connected and fixed with the blade seat in the same direction of centrifugal force, the fixing mode is not affected when the rotor rotates at a low speed and the volume of the rotor and the blade body above the blade seat are not greatly different, but if the rotor needs to rotate at a high speed, and meanwhile, when the volume of the rotor and the volume of the blade body above the blade seat are greatly different, the rotor drives the blade seat to rotate, and then, extremely large centrifugal force is generated, so that unstable connection between the rotor and the blade seat is caused (the rotor and the blade seat cannot be integrally formed from the material angle), and the rotor and the blade seat can be in a falling danger; the rotor is directly assembled with the blade seat, the assembly process is complex in the prior art, and finally, no gap is formed between the rotor and the blade seat due to the direct assembly of the rotor and the blade seat, and heat generated by the rotor during high-speed rotation cannot be dissipated through the blade seat due to the material problem of the blade seat.

Disclosure of Invention

In order to solve the problems, the application provides an external rotor fan which can meet the requirements of high-speed rotation of a rotor and miniaturization of the rotor, and connection stability of the rotor and external components and good heat dissipation, and particularly relates to an external rotor fan which comprises an external rotor motor body arranged on one side of a base, an electric control unit arranged on the other side of the base, the external rotor motor body comprises a main shaft and a motor stator sleeved on the main shaft, 18 tooth crowns extending outwards along the outer circumference of the motor stator, a gear is used for winding coils, the 18 tooth crowns divide the outer circumference of the motor stator into 18 tooth grooves, the tail end of each tooth crown is provided with a stator tooth pole, a rotor assembly is sleeved outside the motor stator, the rotor assembly comprises an integrally formed rotor core and 22 permanent magnets embedded in the rotor core, a cylindrical connecting cover is arranged outside the rotor assembly, the inner side wall of the connecting cover is tightly attached to the rotor assembly, an annular blade seat is sleeved on the outer side wall of the connecting cover, and the connecting cover and the side wall of the blade seat is fixedly connected with the connecting cover in the direction perpendicular to the connecting cover.

Further, the connection cover further includes a top surface on which a first through hole is provided, and the spindle is inserted into the first through hole when the connection cover is assembled with the rotor assembly.

Furthermore, one end of the side wall far away from the top surface extends outwards to form a connecting surface, the connecting surface is perpendicular to the side wall, a distance exists between the base and the side wall, the blade seat comprises an inner ring, an outer ring and a connecting groove between the inner ring and the outer ring, and the connecting groove is mutually fixed with the connecting surface through a bolt structure in a direction perpendicular to the side wall.

Further, the blade seat further comprises an inner ring and an outer ring, the inner ring is attached to the outer portion of the side wall, and integrally formed wind blades are arranged on the outer portion of the outer ring.

Further, a second through hole is formed in the connecting surface, and a first through groove is formed in the connecting groove.

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

Furthermore, a top cover is further arranged at one end, far away from the connecting surface, of the blade seat, a second through groove is further formed in the connecting groove, and a connecting rod matched with the second through groove in shape is arranged on one side of the top cover.

Further, the connecting rod has inward elasticity.

Further, the connecting groove is also provided with a bump, and the top cover is provided with a third through hole matched with the bump in shape.

Further, a plurality of raised strips are arranged on the inner ring of the blade seat according to preset intervals, the top cover is provided with an outer concave, and a gap surrounding the connecting cover is formed between the connecting cover and the blade seat and the top cover.

Compared with the prior art, the invention has the beneficial effects that:

Compared with the prior art, the application has the advantages that:

1. Compared with the prior art, in the application scenario of this scheme, for example, in the outer rotor motor body needs miniaturization and high-speed rotation, rotor subassembly in this scheme links to each other with the blade seat through the junction housing, thereby avoided rotor subassembly and blade seat to link to each other directly and can cause the influence to rotor subassembly, secondly, link to each other between junction housing and the blade seat is not the lateral wall links to each other with the blade seat inner wall, but between through setting up the junction surface and the blade seat of perpendicular to junction housing lateral wall, form and form fixedly with the direction of perpendicular to rotor subassembly, like this when rotor subassembly carries out high-speed rotation, because the direction of connection of junction housing and blade seat can be perpendicular with the direction of centrifugal force, can furthest avoid the influence that centrifugal force is connected between junction housing and the blade seat like this, thereby further increased the steadiness that both link to each other.

2. Secondly, under the structure of the same length-diameter ratio, in the structure of the 22-pole 18-slot, the application can output higher rotating speed outwards by using a motor stator and rotor assembly with smaller size in a narrow scene, and can provide higher output power and better motor efficiency in the environment of high rotating speed.

3. Third, in the assembly process, when this scheme was assembled, rotor subassembly passed through the junction housing and was linked to each other with the blade seat, can be earlier with rotor subassembly and junction housing design integrated into one piece (because material compatibility problem in the prior art, can't design rotor subassembly and blade seat into integrated into one piece), assemble the junction housing earlier like this, then assemble the outside at the junction housing with the blade seat again, reuse the screw rod with fixed between the two get final product, in like this when having strengthened the steadiness that blade seat links to each other with the junction housing, still further simplified the assembly flow, practiced thrift the manufacturing cost of enterprise.

4. Finally, in this embodiment, the outer rotor motor body generates heat when rotating at a high speed, and the heat generates wind along with the rotation of the rotor assembly and flows out from between the connection cover and the base, so as to perform a preliminary heat dissipation function, and meanwhile, the heat generates heat due to the connection cover, and the rotation of the rotor assembly generates wind, and after flowing out from between the connection cover and the base, a part of the wind flows into a gap between the connection cover and the blade seat and the top cover, so as to perform a further heat dissipation function on the connection cover.

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.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is an exploded view of the overall structure of an outer rotor fan of the present invention;

FIG. 2 is a schematic diagram of the assembly structure of the base, outer rotor motor body and connecting cover of the outer rotor fan of the present invention;

FIG. 3 is an overall block diagram of a connecting cover of an outer rotor fan of the present invention;

FIG. 4 is an overall block diagram of a blade mount of an outer rotor fan of the present invention;

FIG. 5 is an overall block diagram of the top cover of the outer rotor fan of the present invention;

FIG. 6 is a schematic diagram of a motor stator and rotor assembly of an outer rotor fan of the present invention;

FIG. 7 is a cross-sectional view of an outer rotor fan of the present invention;

Fig. 8 is a graph showing performance of an outer rotor motor body in the working environment of the present embodiment in the prior art;

FIG. 9 is a graph showing the performance of the outer rotor motor body of the outer rotor fan according to the present invention in the working environment of the present embodiment;

reference numerals and names in the drawings are as follows:

The motor comprises a base 30, an outer rotor motor body 10, an electric control unit 20, a main shaft 11, a motor stator 12, a tooth crown 111, tooth grooves 112, stator teeth 113, a rotor assembly 13, a rotor core 114, a permanent magnet 115, a groove 116, a connecting cover 100, a side wall 110, a top surface 120, a first through hole 121, a connecting surface 130, a blade seat 200, an inner ring 210, an outer ring 220, a connecting groove 230, a blade 221, a second through hole 131, a first through groove 231, a screw 40, a top cover 300, a second through groove 232, a connecting rod 310, a salient point 233, a third through hole 320, a convex strip 211 and a gap 50.

Detailed Description

The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1 to 3, an external rotor fan according to a preferred embodiment of the present invention further includes an external rotor motor body 10 disposed on one side of a base 30, an electric control unit 20 disposed on the other side of the base 30, the external rotor motor body 10 including a main shaft 11 and a motor stator 12 sleeved on the main shaft 11, 18 crowns 111 extending outwardly along an outer circumference of the motor stator 12, a gear for winding coils (not shown), the 18 crowns 111 dividing the outer circumference of the motor stator 12 into 18 tooth slots 112, a stator tooth 113 disposed at an end of the crown 111, and a rotor assembly 13 disposed outside the motor stator 12, the rotor assembly 13 including an integrally formed rotor core 114 and 22 permanent magnets 115 embedded in the rotor core 114, the motor stator 12 being electrically connected to the electric control unit 20, and generating a magnetic field after the motor stator 12 is energized to drive the rotor assembly 13 to rotate around the motor stator 12.

As shown in fig. 1 and 3, a cylindrical connection cover 100 is disposed outside the rotor assembly 13, and the connection cover 100 is tightly connected with the rotor assembly 13, and when the rotor assembly 13 rotates, the connection cover 100 is driven to synchronously rotate.

As shown in fig. 1 and 3, the connection cover 100 includes a side wall 110 and a top surface 120, the side wall 110 is closely attached to the rotor assembly 13, a first through hole 121 is provided on the top surface 120, and when the connection cover 100 is assembled with the rotor assembly 13, the main shaft 11 is inserted into the first through hole 121, so that a guiding effect is provided for the assembly between the connection cover 100 and the rotor assembly 13.

As shown in fig. 3 and fig. 4, a connection surface 130 is extended outwards from one end of the side wall 110 far away from the top surface 120, the connection surface 130 is perpendicular to the side wall 110, a distance exists between the base 30 and the side wall 110 of the connection cover 100, an annular blade seat 200 is sleeved on the outer side of the side wall 110, the blade seat 200 comprises an inner ring 210, an outer ring 220 and a connection groove 230 between the inner ring 210 and the side wall 110, an integrally formed blade 221 is attached between the inner ring 210 and the side wall 110, when the blade seat 200 is assembled with the connection cover 100, the inner ring 210 and the side wall 110 are attached, the connection groove 230 is fixed with the connection surface 130 in a direction perpendicular to the side wall 110 through a bolt structure, and thus the blade seat 200 and the connection cover 100 are fixed in a direction perpendicular to the rotor assembly 13.

In this way, in the application scenario of the solution, for example, in the case that the outer rotor motor body 10 needs to be miniaturized and rotates at a high speed, the rotor assembly 13 in the solution is connected with the blade seat 200 through the connection cover 100, so that the influence possibly caused to the rotor assembly 13 due to the direct connection between the rotor assembly 13 and the blade seat 200 is avoided, and secondly, the connection between the connection 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 the connection surface 130 perpendicular to the side wall 110 of the connection cover 100 and the blade seat 200 is arranged, so that the connection is formed and fixed in the direction perpendicular to the rotor assembly 13, and thus, when the rotor assembly 13 rotates at a high speed, the connection direction of the connection cover 100 and the blade seat 200 is perpendicular to the direction of the centrifugal force, so that the influence of the connection between the centrifugal force and the connection cover 100 and the blade seat 200 is avoided to the greatest extent, and the stability of the connection between the connection is further increased.

According to the application, by designing a structure that 22 permanent magnets 115 and 18 tooth grooves 112 form 22 pole 18 grooves, under the structure of the same length-diameter ratio, the application can use a motor stator 12 and a rotor assembly 13 with smaller size to output higher rotating speed outwards in a narrow scene, and simultaneously can provide higher output power and better motor Efficiency in the high-rotating-speed environment, wherein the length-diameter ratio refers to the ratio between the thickness and the end surface diameter of the whole motor stator 12 and the rotor assembly 13 after the assembly is completed, the application aims at the field, in the narrow application scene, the structure of the 22 pole 18 grooves can be designed into a flatter structure, and can provide higher output power and better motor Efficiency, the effects are further illustrated by combining with fig. 8 and 9, fig. 8 is a performance graph of an outer rotor motor body in the working environment of the embodiment in the prior art and the performance of the motor body in the working environment of the embodiment in the application, wherein the reference sign A represents the rotating speed (RSpeed), the reference sign B represents the input current and the reference sign B represents the ratio between the thickness and the end surface diameter of the rotor assembly 13, the 22 pole 18 grooves can be designed into a flatter structure in the narrow application scene, and the effect can be further illustrated by combining with fig. 8 and fig. 9, the graph of fig. 9 is the performance graph of the outer rotor motor body in the working environment of the embodiment in the prior art, the performance graph of the outer rotor motor body in the working environment, the performance of the embodiment is better than the outer rotor motor body, and the performance graph of the outer rotor motor body in the working Efficiency (the outer rotor motor body can still can represent the performance of the outer rotor in the working Efficiency of the rotor in the working Efficiency) can be compared with the performance graph of the application at higher performance (higher Efficiency) can and higher output Efficiency of the performance graph can be compared with the performance graph can.1000).

As shown in fig. 3 and 4, the second through hole 131 is formed in the connection surface 130, the first through groove 231 is formed in the connection groove 230, and when the blade mount 200 is assembled with the connection cover 100, 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 fixedly connect the blade mount 200 with the connection cover 100.

From the above assembling process, it can be seen that, when the rotor assembly 13 is assembled by the present embodiment, the rotor assembly 13 is connected with the blade seat 200 through the connection cover 100, and the rotor assembly 13 and the connection cover 100 can be designed into an integrated form (in the prior art, the rotor assembly 13 and the blade seat 200 can not be designed into an integrated form almost due to the material compatibility problem), so that the connection cover 100 is assembled, then the blade seat 200 is assembled outside the connection cover 100, and then the connection cover 100 is fixed by the screw 40, so that the assembling process is further simplified while the connection stability of the blade seat 200 and the connection cover 100 is enhanced, and the production cost of enterprises is saved.

Further, as shown in fig. 5, a top cover 300 is further disposed at an end of the blade seat 200 away from the connection surface 130, the top cover 300 is fixedly connected with the blade seat 200 through a buckle, specifically, a second through groove 232 is further disposed on the connection groove 230, a connecting rod 310 matched with the second through groove 232 is disposed at one side of the top cover 300, when the top cover 300 needs to be mounted on the blade seat 200, the connecting rod 310 is only required to be inserted into the second through groove 232, preferably, the connecting rod 310 has a certain elasticity in an inward direction, so that the connecting rod 310 can be better clamped inside the second through groove 232 after being inserted into the second through groove 232.

Furthermore, the connecting groove 230 is further provided with a protruding point 233, and the top cover 300 is provided with a third through hole 320 matching the protruding point 233, and when the top cover 300 is mounted on the blade seat 200, the protruding point 233 is inserted into the third through hole 320, so that the top cover 300 is well matched with the connecting rod 310 to form a limit on the circumferential surface, and thus, falling off from the blade seat 200 when the top cover 300 rotates can be well avoided.

Referring to fig. 1, the top cover 300 completely covers the end of the blade seat 200 away from the connection surface 130, so that moisture or other impurities can be prevented from entering from the end of the blade seat 200, thereby affecting the rotation of the rotor assembly 13.

Further, as shown in fig. 6, a plurality of grooves 116 are formed in the rotor core 114 at predetermined intervals, and the permanent magnets 115 are installed in the grooves 116 by interference fit, so that compared with the structure in which the permanent magnets 115 are inserted after the permanent magnets 115 are opened in the rotor core 114, the processing of the rotor core 114 can be reduced, thereby improving the productivity and the waste of core materials.

As shown in fig. 1 and 7, it is preferable that a plurality of protrusions 211 are provided on the inner ring 210 of the blade holder 200 at predetermined intervals, so that when the inner ring 210 of the blade holder 200 is attached to the connection cover 100, a gap 50 is formed between the inner ring 210 and the connection cover 100, thereby allowing air to 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 is also formed between the connection cover 100 and the top cover 300, and at the same time, since the blade holder 200 is connected to the connection surface 130 by a bolt structure, the interval between the blade holder 200 and the connection surface 130 is also adjustable, when the interval between the blade holder 200 and the connection surface 130 is also formed, a gap 50 surrounding the connection cover 100 is formed between the connection cover 100 and the blade holder 200 and the top cover 300, meanwhile, since the connection surface 130 and the side wall 110 are perpendicular to each other and there is a distance between the base 30, in this embodiment, heat is generated when the outer rotor motor body 10 rotates at a high speed, and the heat is accompanied with the rotation of the rotor assembly 13 to generate wind, which flows out from between the connection cover 100 and the base 30, so as to perform a preliminary heat dissipation function, meanwhile, the heat is accompanied with the heat to generate heat by the connection cover 100, and the rotation of the rotor assembly 13 generates wind, after flowing out from between the connection cover 100 and the base 30, a part of the wind flows into the gap 50 formed between the connection cover 100 and the blade seat 200 and the top cover 300 and surrounds the connection cover 100, so that in the narrow environment applied in this embodiment, a further heat dissipation function is performed on the connection cover 100, so that the heat dissipation effect of the outer rotor motor body 10 is further improved, and it is noted that in the case of this embodiment, the connection surface 130 functions not only to provide a connection of the blade mount 200 in the vertical direction, but also to allow the distance between the connection surface 130 and the blade mount 200 to be adjustable, so that the connection surface 130 also functions to help the heat dissipation of the connection cover 100.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. The outer rotor fan is characterized by comprising 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 18 tooth crowns (111) sleeved on the main shaft (11), 18 tooth crowns (111) are outwards extended along the outer circumference of the motor stator (12), 18 tooth crowns (111) divide the outer circumference of the motor stator (12) to form 18 tooth grooves (112), stator teeth (113) are arranged at the tail end of the tooth crowns (111), a rotor assembly (13) is sleeved outside 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), a cylindrical connecting cover (100) is arranged outside the rotor assembly (13), the side wall (110) of the connecting cover (100) is tightly attached to the rotor assembly (13), annular blades (200) are arranged on the side wall (110) of the connecting cover (100), and the annular blades (200) are connected with the side wall (100) in a sleeved mode, and the annular blades (200) are connected with the side wall (100) in a direction perpendicular to the connecting seat (100), 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 fixed with the connecting surface (130) through a bolt structure in the direction perpendicular to the side wall (110), the blade seat (200) further comprises an inner ring (210) and an outer ring (220), the inner ring (210) is attached to the outer side of the side wall (110), an integrally formed wind blade (221) is arranged on the outer side of the outer ring (220), the connecting surface (130) is arranged on the connecting surface (130), the connecting groove (230) is arranged between the inner ring (210) and the side wall (110), and the connecting groove (230) is arranged in the connecting groove (230).

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

3. The external rotor fan according to claim 1, wherein a top cover (300) is further arranged at one end of the blade seat (200) far away from the connecting surface (130), a second through groove (232) is further arranged on the connecting groove (230), and a connecting rod (310) matched with the second through groove (232) in a shape is arranged at one side of the top cover (300).

4. An outer rotor fan according to claim 3, wherein the connecting rod (310) has inward elasticity, a bump (233) is further provided on the connecting groove (230), and a third through hole (320) matching the bump (233) in shape 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 provided at predetermined intervals inside the rotor core (114), and the permanent magnets (115) are mounted in the grooves (116) by interference fit.

6. The outer rotor fan according to claim 4, wherein a plurality of protruding strips (211) are provided at predetermined intervals on the inner ring (210) of the blade holder (200), the top cover (300) is provided with a concave-out shape, and a gap (50) surrounding the connection cover (100) is formed between the connection cover (100) and the blade holder (200) and the top cover (300).