Fan

Abstract

The utility model provides a fan. The reliability of the fan can be improved based on the design. The fan comprises a motor, a mounting bracket, a fixing plate, a plurality of fan blades capable of rotating around a rotating axis under the driving of the motor, and an air inlet mesh enclosure, the motor comprises a stator and a rotor, and the stator comprises a coil winding, a stator iron core and a positioning bracket for fixing the stator. The fixing plate is located on one side of two opposite sides of the stator in the axial direction of the motor, the positioning support surrounds the rotation axis, the fixing plate is made of metal materials, the positioning support is made of metal materials, the fixing plate is fixed to the installation support, and the positioning support is installed and fixed to the fixing plate.

Description

Technical Field

[0001] This utility model relates to a fan. Background Technology

[0002] An existing fan includes a motor, a mounting bracket, several fan blades that can rotate around a rotation axis under the drive of the motor, and an air inlet grille. The motor includes a stator and a rotor. The stator includes coil windings and a stator core. The stator is directly mounted and fixed on a mounting bracket made of plastic material. The plastic mounting bracket is prone to insufficient mechanical strength. When the motor is working, the heat of the motor can be directly transferred from the stator to the mounting bracket, causing the plastic mounting bracket to weaken and become less mechanically strong. This results in the stator's position relative to the mounting bracket being unstable when the motor is working, thus reducing the reliability of the fan. Utility Model Content

[0003] This patent application provides a fan, based on which the reliability of the fan can be improved.

[0004] The fan of this design includes a motor, a mounting bracket, a fixing plate, several fan blades that can rotate around a rotation axis under the drive of the motor, and an air inlet grille. The motor includes a stator and a rotor. The stator includes coil windings, a stator core, and a positioning bracket for fixing the stator. The fixing plate is located on one side of the stator on opposite sides along the axial direction of the motor. The positioning bracket surrounds the rotation axis. The fixing plate is made of metal. The positioning bracket is made of metal. The fixing plate is fixed to the mounting bracket, and the positioning bracket is fixed to the fixing plate.

[0005] Optionally, the rotor includes a rotating shaft that passes through a fixed plate. The positioning bracket is cylindrical and surrounds the rotating shaft. The positioning bracket has a first end, which is one of the opposite ends of the positioning bracket in the axial direction of the motor. The first end is fixedly mounted on the fixed plate. The mounting bracket includes a mounting wall. The fixed plate is located on one side of the mounting wall opposite to the coil winding and stator core in the axial direction of the motor. The fixed plate is fixedly mounted on the mounting wall. The mounting wall has an inner periphery surrounding the rotation axis, and the inner periphery of the mounting wall surrounds the first end of the positioning bracket.

[0006] Optionally, the stator core has a first mounting opening corresponding to the positioning bracket. A portion of the positioning bracket is installed into the first mounting opening and fixed to the stator core. The first mounting opening includes at least one guide groove. The positioning bracket includes at least one guide rail corresponding to the at least one guide groove. The at least one guide rail is located on the outer periphery of the positioning bracket. The guide groove passes through the stator core in the axial direction of the motor. The at least one guide groove and the at least one guide rail are used to guide the positioning bracket to be installed into the first mounting opening. The at least one guide rail is embedded in the corresponding at least one guide groove.

[0007] Optionally, the positioning bracket is pressed into the first mounting port and fixed together with the stator core by interference fit. The positioning bracket includes a plurality of stop protrusions located on the outer periphery of the positioning bracket. The guide rail extends integrally from the corresponding stop protrusion. The plurality of stop protrusions stop on one side of the stator core on opposite sides in the axial direction of the motor, so as to prevent the positioning bracket from being over-inserted into the first mounting port.

[0008] Optionally, the fan further includes a plurality of first locking elements and a plurality of second locking elements. The fixing plate is mounted and fixed to the mounting bracket. The fixing plate has a plurality of first mounting holes corresponding to the plurality of first locking elements and a plurality of second mounting holes corresponding to the plurality of second locking elements. The plurality of first locking elements are used to lock the positioning bracket to the fixing plate, and the plurality of second locking elements are used to lock the fixing plate to the mounting bracket. The mounting bracket is made of plastic material, and the vertical distance from each second locking element to the rotation axis is greater than the vertical distance from each first locking element to the rotation axis.

[0009] Optionally, the vertical distance from each of the second mounting holes to the rotation axis is greater than the vertical distance from each of the first mounting holes to the rotation axis; the plurality of first locking elements and the plurality of first mounting holes are distributed on a first circumference surrounding the rotation axis, and the plurality of second locking elements and the plurality of second mounting holes are distributed on a second circumference surrounding the rotation axis, the radius of the second circumference is greater than that of the first circumference, and the second circumference and the first circumference are respectively centered on the rotation axis; each of the first locking elements passes through the corresponding first mounting hole, and each of the second locking elements passes through the corresponding second mounting hole.

[0010] Optionally, the rotation axis is perpendicular to the fixed plate, and each second locking element and its corresponding first locking element are located on a virtual plane to which the rotation axis belongs; each second mounting hole and its corresponding first mounting hole are located on a virtual plane to which the rotation axis belongs; in the radial direction of the motor, each second locking element is located outside the corresponding first locking element; in the radial direction of the motor, each second mounting hole is located outside the corresponding first mounting hole; the plurality of first locking elements are evenly distributed on the circumference surrounding the rotation axis, and the plurality of second locking elements are evenly distributed on the circumference surrounding the rotation axis; the plurality of first mounting holes are evenly distributed on the circumference surrounding the rotation axis, and the plurality of second mounting holes are evenly distributed on the circumference surrounding the rotation axis.

[0011] Optionally, the first locking element is a metal screw or a metal bolt, and the second locking element is a metal screw or a metal bolt.

[0012] Optionally, the fan further includes an outer casing and a control switch. The mounting bracket is located between the plurality of fan blades and the outer casing. The mounting bracket and the outer casing are assembled and fixed together to form a box shape. The control switch is exposed on the side of the outer casing opposite to the mounting bracket. The mounting bracket is a single plastic part integrally formed. The rotor, stator, and fixing plate are located within the receiving space enclosed by the outer casing and the mounting bracket.

[0013] Optionally, the fan further includes an electrical connection port and a battery pack slot. The fan is an AC / DC dual-purpose fan. The electrical connection port is used to obtain external AC power. The battery pack slot allows an external battery pack to be inserted. The electrical connection port and the battery pack slot are exposed on the side of the outer casing opposite to the mounting bracket. The battery pack slot intersects the vertical plane containing the rotation axis. The battery pack slot may intersect the rotation axis or not intersect the rotation axis and be located below the rotation axis.

[0014] Optionally, the fan further includes a plurality of first locking elements and a plurality of second locking elements. The mounting bracket includes a mounting wall made of plastic. The fixing plate abuts against the mounting wall. The mounting wall is located on one side of opposite sides of the stator along the axial direction of the motor. The fixing plate is fixedly mounted to the mounting wall. The fixing plate has a plurality of first mounting holes corresponding to the plurality of first locking elements and a plurality of second mounting holes corresponding to the plurality of second locking elements. The plurality of first locking elements are used to lock the positioning bracket to the fixing plate. The plurality of second locking elements are used to lock the fixing plate to the mounting wall. The mounting wall is provided with a plurality of third mounting holes corresponding to the plurality of second locking elements and the plurality of second mounting holes.

[0015] Optionally, the fixing plate, mounting wall, and stator core are distributed sequentially along the axial direction of the motor. The mounting wall has a second mounting opening, through which the rotation axis passes. The positioning bracket is partially accommodated in the second mounting opening. The mounting wall has an inner periphery that surrounds the second mounting opening. The inner periphery of the mounting wall surrounds the positioning bracket. The positioning bracket has a fourth mounting hole corresponding to the first mounting hole and the first locking element. Each first locking element is at least partially accommodated in the corresponding fourth mounting hole. The vertical distance from each third mounting hole to the rotation axis is greater than the vertical distance from each fourth mounting hole to the rotation axis.

[0016] Optionally, the positioning bracket includes several locking parts, the fourth mounting hole is opened in the corresponding locking part, each first locking element is locked in the corresponding locking part, the positioning bracket does not contact the mounting wall, the second mounting port includes several clearance grooves corresponding to the several locking parts, the several clearance grooves are distributed on the inner periphery of the mounting wall, each locking part is embedded in the corresponding clearance groove, and each locking part protrudes from the outer periphery of one end of the positioning bracket.

[0017] Optionally, the fan further includes an impeller comprising the plurality of blades, and the rotor includes a rotating shaft for driving the impeller to rotate, the rotating axis forming the central axis of the rotating shaft; the positioning bracket surrounds the rotating shaft, and the motor further includes at least one bearing housed within the space enclosed by the positioning bracket, the rotating shaft passing through the at least one bearing, the at least one bearing for rotatable connection between the rotating shaft and the positioning bracket, the rotating shaft passing through the fixed plate, the mounting wall, and the positioning bracket, the rotating shaft being perpendicular to the fixed plate, and the vertical distance from each of the second mounting holes to the rotating axis being greater than the vertical distance from each of the first mounting holes to the rotating axis.

[0018] Optionally, the mounting bracket includes a first outer ring wall, which is integrally connected to the mounting wall and surrounds the motor.

[0019] Optionally, the rotor includes a magnet and a shaft, the shaft passing through a fixed plate and a mounting wall, the fixed plate and the mounting wall being fitted together axially in the motor, and the shaft being perpendicular to the fixed plate; the mounting wall is provided with an annular protrusion, the annular protrusion being protruding on the side of the mounting wall opposite to the coil winding and stator core, and the fixed plate being embedded in the area formed by the annular protrusion.

[0020] Optionally, the stator is at least partially housed within the space enclosed by the rotor, the motor is an external rotor motor, and the rotor includes a magnet located between the stator core and the first outer ring wall.

[0021] Optionally, the rotor includes a magnet, a rotor housing, and a rotating shaft. The magnet is fixedly disposed inside the rotor housing. The rotor housing includes a second outer ring wall and a first side wall. The first outer ring wall is spaced apart from the second outer ring wall and located on the periphery of the second outer ring wall. The magnet is located between the periphery of the stator core and the second outer ring wall. The magnet is made of annular magnets and is attached to the inner circumferential surface of the second outer ring wall. The first side wall and the mounting wall are located on opposite sides of the stator in the axial direction of the motor. The first side wall is connected to the opposite ends of the second outer ring wall, away from the mounting wall. The rotating shaft is used to drive the plurality of fan blades to rotate. The rotating shaft is fixedly connected to the first side wall. When the rotor rotates, it drives the rotating shaft to rotate through the rotor housing. The first side wall and the second outer ring wall are integrally connected. The second outer ring wall extends from the outer periphery of the first side wall toward the mounting wall. The rotor housing is made of metal material.

[0022] Optionally, the motor further includes wires connecting to the stator. The fixing plate has a first wiring hole, and the mounting wall has a second wiring hole. The first wiring hole and the second wiring hole are positioned opposite each other. The wires pass through the first wiring hole and the second wiring hole. The mounting bracket also includes a back plate. The mounting bracket abuts against the air inlet grille through the back plate. The mounting bracket also has a wiring channel. A portion of the wire extends along the wiring channel. The wiring channel is located radially outside the first outer ring wall. The wiring channel passes through opposite sides of the mounting bracket in the axial direction of the motor. One end of the wiring channel is closer to the first wiring hole than the other end of the wiring channel. The other end of the wiring channel is located on the back plate. The wires extend from the side of the mounting wall facing the coil winding to the side of the fixing plate away from the coil winding via the second wiring hole and the first wiring hole. The wires sequentially pass through the second wiring hole, the first wiring hole, one end of the wiring channel, and the other end of the wiring channel.

[0023] Optionally, the fan further includes a main control board and an outer casing. The mounting bracket is assembled and fixed together with the outer casing. The wires are electrically connected between the main control board and the coil winding. The main control board is located between the back plate and the outer casing. The positioning bracket includes several limiting protrusions located at one end of the positioning bracket at opposite ends along the axial direction of the motor. The fixing plate has several limiting grooves corresponding to the limiting protrusions. The limiting protrusions are embedded in the corresponding limiting grooves. One of the limiting protrusions has a different size than the other limiting protrusions, and a limiting groove that corresponds to one of the limiting protrusions has a different size than the other limiting grooves, in order to prevent mistaken assembly position between the positioning bracket and the fixing plate.

[0024] Optionally, the fan further includes an impeller, which includes the plurality of blades and a hub. The rotor includes a shaft, and the hub includes a third outer ring wall and a second side wall. The third outer ring wall surrounds the shaft, and the fixing plate and mounting wall are located inside the hub. The third outer ring wall surrounds and is spaced apart from the first outer ring wall. The plurality of blades are distributed around the periphery of the hub and connected to the third outer ring wall. The second side wall is integrally connected to the third outer ring wall, and the shaft passes through the second side wall and is fixed to the second side wall. The fixing plate is located between the second side wall and the mounting wall. The second side wall, the fixing plate, the mounting wall, and the stator core are distributed in sequence.

[0025] Optionally, the fan further includes a plurality of third locking elements and an outer casing assembled and fixed together with the mounting bracket. The mounting bracket is fixed to the air inlet grille by means of the plurality of third locking elements. The mounting bracket also includes a back plate. The mounting bracket rests against the air inlet grille through the back plate. The first outer ring wall extends integrally from the back plate in a direction away from the outer casing. The mounting wall is located at the end of the first outer ring wall away from the back plate.

[0026] Optionally, the fan further includes a control switch exposed on the outside of the outer casing. The mounting bracket is fixed to the air inlet mesh cover, which is a metal mesh cover. The air inlet mesh cover has a plurality of first positioning feet corresponding to the plurality of third locking elements and a third mounting port. The mounting bracket passes through the third mounting port. The plurality of first positioning feet are adjacent to the third mounting port. The plurality of first positioning feet are located on the side of the back plate opposite to the outer casing. The mounting bracket is locked to the plurality of first positioning feet by means of the plurality of third locking elements and fixed to the air inlet mesh cover. One end of the first outer ring wall connected to the back plate is adjacent to the third mounting port. The plurality of first positioning feet are distributed around the periphery of the end of the first outer ring wall connected to the back plate.

[0027] Optionally, the mounting wall is provided with at least one first heat dissipation hole, the fixing plate is provided with at least one second heat dissipation hole corresponding to the at least one first heat dissipation hole, at least one third heat dissipation hole is provided at the junction of the first outer ring wall and the back plate, and at least one fourth heat dissipation hole is provided at the junction of the first outer ring wall and the mounting wall.

[0028] In this design, the metal positioning bracket for fixing the stator is indirectly fixed to the mounting bracket by means of a metal fixing plate. Since the fixing plate and the positioning bracket are made of metal, they can provide stronger mechanical strength and withstand greater torque, which helps the stator to maintain a stable position relative to the mounting bracket when the motor is working, thereby improving the reliability of the fan. Attached Figure Description

[0029] Figure 1 This is a perspective view of the fan according to this patent application;

[0030] Figure 2 is an exploded view of the fan of this patent application;

[0031] Figure 3 is Figure 2 a partial enlarged view of;

[0032] Figure 4 is a partial three-dimensional enlarged view of the fan of this patent application after removing the outer housing;

[0033] Figure 5 is a partial enlarged view of the fan of this patent application after vertical sectioning (the section plane is the vertical plane where the rotation axis is located);

[0034] Figure 6 is a partial enlarged view of the fan of this patent application after horizontal sectioning (the section plane is the horizontal plane where the rotation axis is located);

[0035] Figure 7 is an exploded view of the motor, mounting bracket, fixing plate, and outer housing of the fan of this patent application;

[0036] Figure 8 is another exploded view of the motor, mounting bracket, fixing plate, and outer housing of the fan of this patent application;

[0037] Figure 9 is an exploded view of the motor of the fan of this patent application;

[0038] Figure 10 is another exploded view of the motor of the fan of this patent application (the rotor housing is not shown). Detailed implementation manners

[0039] Refer Figures 1 to 10The fan 1 shown includes a motor 2, a mounting bracket 3, a fixing plate 4, several fan blades 170 that can rotate around a rotation axis A under the drive of the motor 2, and an air inlet grille 10. The motor 2 includes a stator 20 and a rotor 22. The stator 20 includes coil windings 200, a stator core 201, and a positioning bracket 21 for fixing the stator 20. The fixing plate 4 is located on one of the opposite sides of the stator 20 along the axial direction of the motor 2. The fixing plate 4 is made of metal. The positioning bracket 21 is made of metal. The fixing plate 4 is fixed to the mounting bracket 3. The positioning bracket 21 is arranged around the rotation axis A and is fixed to the fixing plate 4. The axial direction of the motor 2 is parallel to the rotation axis A of the motor 2. In this design, the positioning bracket 21 for fixing the stator 20 is indirectly fixed to the mounting bracket 3 by means of a metal fixing plate 4. The fixing plate 4 and the positioning bracket 21 are made of metal, providing greater mechanical strength and the ability to withstand greater torque. This helps the stator 20 maintain a stable position relative to the mounting bracket 3 when the motor 2 is operating, thereby improving the reliability of the fan 1. The rated power of the motor 2 is between 10W and 1000W, and can be selected between 30W and 600W, such as 40W, 70W, 125W, and 250W. Considering factors such as cost and mechanical strength, a suitable metal material (such as common steel) can be selected to make the fixing plate 4 and the positioning bracket 21.

[0040] The rotor 22 includes a rotating shaft 23 that passes through the fixed plate 4. The positioning bracket 21 is cylindrical and surrounds the rotating shaft 23. The positioning bracket 21 has a first end 210, which is one of the opposite ends of the positioning bracket 21 in the axial direction of the motor 2. The first end 210 is fixedly mounted on the fixed plate 4. The mounting bracket 3 includes a mounting wall 30. The fixed plate 4 is located on one side of the mounting wall 30 in the axial direction of the motor 2, opposite to the coil winding 200 and the stator core 201. The fixed plate 4 is fixedly mounted on the mounting wall 30. The mounting wall 30 has an inner periphery 300 surrounding the rotation axis A. The inner periphery 300 of the mounting wall 30 surrounds the first end 210 of the positioning bracket 21. This design achieves an effective and reasonable layout, making it convenient to install the fixed plate 4, the mounting wall 30, and the motor 2 together.

[0041] The stator core 201 is formed by stacking multiple silicon steel sheets. The stator core 201 has a first mounting port 2010 corresponding to the positioning bracket 21. A portion of the positioning bracket 21 is installed into the first mounting port 2010 and fixed to the stator core 201. The first mounting port 2010 includes at least one guide groove 2011. The positioning bracket 21 includes at least one guide rail 211 corresponding to the at least one guide groove 2011. The at least one guide rail 211 is located on the outer periphery of the positioning bracket 21. The guide groove 2011 passes through the stator core 201 in the axial direction of the motor 2. The at least one guide groove 2011 and the at least one guide rail 211 are used to guide the positioning bracket 21 to be installed into the first mounting port 2010. The at least one guide rail 211 is embedded in the corresponding at least one guide groove 2011.

[0042] The positioning bracket 21 is pressed into the first mounting port 2010 and fixed together with the stator core 201 by interference fit. The positioning bracket 21 includes a plurality of stop protrusions 212, which are located on the outer periphery of the positioning bracket 21. The guide rail 211 extends integrally from the corresponding stop protrusion 212. The plurality of stop protrusions 212 stop on one of the opposite sides of the stator core 201 in the axial direction of the motor 2, so as to prevent the positioning bracket 21 from being over-inserted into the first mounting port 2010 and ensure that the positioning bracket 21 is installed in place relative to the first mounting port 2010.

[0043] The fan 1 also includes a plurality of first locking elements 110 and a plurality of second locking elements 111. A fixing plate 4 is mounted and fixed to a mounting bracket 3. The fixing plate 4 has a plurality of first mounting holes 40 corresponding to the plurality of first locking elements 110 and a plurality of second mounting holes 41 corresponding to the plurality of second locking elements 111. The plurality of first locking elements 110 are used to lock the positioning bracket 21 to the fixing plate 4, and the plurality of second locking elements 111 are used to lock the fixing plate 4 to the mounting bracket 3. The mounting bracket 3 is made of plastic material, and the vertical distance from each second locking element 111 to the rotation axis A is greater than that of each first locking element. The vertical distance from 110 to the rotation axis A; this design facilitates the realization that when the motor 2 is working, the torque arm borne by the mounting bracket 3 and the fixing plate 4 at the plurality of second locking elements 111 is larger, thus the torque value borne is relatively smaller, reducing the mechanical strength requirements of the plastic mounting bracket 3, making it less prone to damage, while the torque arm borne by the positioning bracket 21 and the fixing plate 4 at the plurality of first locking elements 110 is smaller, thus the torque value borne is relatively larger. Since the positioning bracket 21 and the fixing plate 4 are made of metal, they are not easily damaged under relatively large torque; in summary, this improves the reliability of the fan 1.

[0044] From another perspective, the vertical distance between the part of the fixed plate 4 that is locked to the positioning bracket 21 and the rotation axis A is greater than the vertical distance between the part of the fixed plate 4 that is locked to the mounting bracket 3 and the rotation axis A.

[0045] The plurality of first locking elements 110 are distributed on a first circumference surrounding the rotation axis A, the plurality of second locking elements 111 are distributed on a second circumference surrounding the rotation axis A, the plurality of first mounting holes 40 are distributed on the first circumference surrounding the rotation axis A, and the plurality of second mounting holes 41 are distributed on the second circumference surrounding the rotation axis A. The radius of the second circumference is larger than that of the first circumference, and the second circumference and the first circumference are respectively centered on the rotation axis A. Each first locking element 110 passes through a corresponding first mounting hole 40, and each second locking element 111 passes through a corresponding second mounting hole 41. The vertical distance from each second mounting hole 41 to the rotation axis A is greater than the vertical distance from each first mounting hole 40 to the rotation axis A.

[0046] The rotation axis A is perpendicular to the fixed plate 4 and the mounting wall 30. Each second locking element 111 and its corresponding first locking element 110 are located on a virtual plane belonging to the rotation axis A; each second mounting hole 41 and its corresponding first mounting hole 40 are located on a virtual plane belonging to the rotation axis A; from another perspective, each second locking element 111 and its corresponding first locking element 110 are located in the radial direction of the motor 2; each second mounting hole 41 and its corresponding first mounting hole 40 are located in the radial direction of the motor 2; in the radial direction of the motor 2... Each second locking element 111 is located outside a corresponding first locking element 110; each second mounting hole 41 is located outside a corresponding first mounting hole 40 in the radial direction of the motor 2; the plurality of first locking elements 110 are evenly distributed on the circumference surrounding the rotation axis A, the plurality of second locking elements 111 are evenly distributed on the circumference surrounding the rotation axis A; the plurality of first mounting holes 40 are evenly distributed on the circumference surrounding the rotation axis A, and the plurality of second mounting holes 41 are evenly distributed on the circumference surrounding the rotation axis A. This design helps to improve the overall layout of the plurality of first locking elements 110, the plurality of second locking elements 111, the plurality of first mounting holes 40, and the plurality of second mounting holes 41. The first locking element 110 can be a metal screw or a metal bolt, and the second locking element 111 can be a metal screw or a metal bolt; the metal can be common steel, etc. In this embodiment, three first locking elements 110, three second locking elements 111, three first mounting holes 40, and three second mounting holes 41 are evenly arranged on the circumference surrounding the rotation axis A.

[0047] The fan 1 also includes an outer casing 12 and a control switch 13. The control switch 13 is disposed on the outer casing 12 and exposed on the outside of the outer casing 12. A mounting bracket 3 is assembled and fixed together with the outer casing 12. The control switch 13 is exposed on the side of the outer casing 12 facing away from the mounting bracket 3. The mounting bracket 3 is a single, integrally molded plastic part. The rotor 22, stator 20, and fixing plate 4 are located within the receiving space enclosed by the outer casing 12 and the mounting bracket 3. The control switch 13 can be an adjustment knob, rocker switch, etc. The fan 1 also includes an AC / DC conversion module 14 and a main control board 15. The AC / DC conversion module 14 is electrically connected to the main control board 15. The AC / DC conversion module 14 and the main control board 15 are located within the receiving space enclosed by the outer casing 12 and the mounting bracket 3. The outer casing 12 is a single, integrally molded part made of plastic material. The mounting bracket 3 and the outer casing 12 are assembled together to form a box shape.

[0048] The fan 1 also includes an electrical connection port 160 and a battery pack slot 161. In this embodiment, the fan 1 is an AC / DC dual-purpose fan. The electrical connection port 160 is used to obtain external AC power. The electrical connection port 160 is for connecting to an external cable connector, thereby obtaining AC power through an external AC power source (e.g., mains power). The received AC power is converted to DC power by the AC / DC conversion module 14 and supplied to the main control board 15, which then supplies power to the motor 2. The external battery pack can be plugged into the battery pack slot 161. Battery pack slot 161 is electrically connected to main control board 15; electrical connection port 160 and battery pack slot 161 are fixedly mounted on outer casing 12, with electrical connection port 160 and battery pack slot 161 exposed on the side of outer casing 12 facing away from mounting bracket 3. Battery pack slot 161 intersects with the vertical plane where rotation axis A is located. Battery pack slot 161 may intersect with rotation axis A or not intersect with rotation axis A and be located below rotation axis A, so as to facilitate the control of the center of gravity of fan 1 after the battery pack is inserted - making the center of gravity more centered from left to right and avoiding the center of gravity being too high.

[0049] The mounting wall 30 is made of plastic. The fixing plate 4 is attached to the mounting wall 30. The mounting wall 30 is located on one side of the stator 20 on opposite sides of the motor 2 in the axial direction. The fixing plate 4 is fixed to the mounting wall 30. The mounting wall 30 is provided with a plurality of third mounting holes 301 corresponding to the plurality of second locking elements 111 and the plurality of second mounting holes 41. Each second locking element 111 is fastened to the corresponding third mounting hole 301. The third mounting hole 301 is opposite to the corresponding second mounting hole 41.

[0050] The fixing plate 4, mounting wall 30, and stator core 201 are sequentially distributed along the axial direction of the motor 2. The mounting wall 30 has a second mounting opening 302, through which the rotation axis A passes. The positioning bracket 21 is partially accommodated in the second mounting opening 302. The inner periphery 300 surrounds the second mounting opening 302. The inner periphery 300 of the mounting wall 30 surrounds the positioning bracket 21. The positioning bracket 21 has a fourth mounting hole 2130 corresponding to the first mounting hole 40 and the first locking element 110. Each first locking element 110 is at least partially accommodated in the corresponding fourth mounting hole 2130. The vertical distance from each third mounting hole 301 to the rotation axis A is greater than the vertical distance from each fourth mounting hole 2130 to the rotation axis A.

[0051] The positioning bracket 21 includes several locking parts 213. A fourth mounting hole 2130 is formed in a corresponding locking part 213. Each first locking element 110 is locked in its corresponding locking part 213. The positioning bracket 21 does not contact the mounting wall 30, completely avoiding direct interaction between them. The second mounting opening 302 includes several clearance grooves 3020 corresponding to the locking parts 213. These clearance grooves 3020 are distributed along the inner periphery 300 of the mounting wall 30. Each locking part 213 is embedded in its corresponding clearance groove 3020 to approach and fix to the fixing plate 4. Each locking part 213 protrudes from the outer periphery of one end of the positioning bracket 21. In this embodiment, each locking part 213 forms a lug located on the outer periphery of the positioning bracket 21. In this embodiment, three clearance grooves 3020 are evenly distributed along the inner periphery 300 of the mounting wall 30.

[0052] The fan 1 also includes an impeller 17, which includes the plurality of fan blades 170. The motor 2 also includes at least one bearing 24. The impeller 17 is mounted on a rotating shaft 23, which drives the impeller 17 to rotate. The rotation axis A forms the central axis of the rotating shaft 23. The at least one bearing 24 is housed within the space enclosed by the positioning bracket 21. The rotating shaft 23 passes through the at least one bearing 24 and is used for the rotational connection between the rotating shaft 23 and the positioning bracket 21. The rotating shaft 23 passes through the fixing plate 4, the mounting wall 30, and the positioning bracket 21. The rotating shaft 23 is perpendicular to the fixing plate 4 and the mounting wall 30. The impeller 17 is fixed relative to the rotating shaft 23. The mounting bracket 3 includes a first outer ring wall 31, which is integrally connected to the mounting wall 30 and surrounds the motor 2. The mounting wall 30 has an outer periphery 304 surrounding the rotation axis A, which forms the boundary between the mounting wall 30 and the first outer ring wall 31. The mounting bracket 3 is a single, integrally molded part. The fixing plate 4 and the mounting wall 30 are attached together axially in the motor 2. The mounting wall 30 is provided with an annular protrusion 305, which protrudes from the side of the mounting wall 30 opposite to the coil winding 200 and the stator core 201. The fixing plate 4 is embedded in the area formed by the annular protrusion 305. The stator 20 and the rotor 22 are located in the space surrounded by the first outer ring wall 31. The annular protrusion 305 is an annular rib.

[0053] The stator 20 is at least partially housed within the space enclosed by the rotor 22. The motor 2 is an external rotor motor 2. The rotor 22 includes a magnet 220, which is located between the stator core 201 and the first outer ring wall 31.

[0054] The rotor 22 includes a rotor housing 221, and a magnet 220 is fixedly disposed within the rotor housing 221. The rotor housing 221 includes a second outer ring wall 2210 and a first side wall 2211. The magnet 220 is located radially inside the second outer ring wall 2210. The first outer ring wall 31 is spaced apart from the second outer ring wall 2210 and located on the periphery of the second outer ring wall 2210. The magnet 220 is located between the periphery of the stator core 201 and the second outer ring wall 2210. The magnet 220 is made of annular magnets and is attached to the inner circumferential surface of the second outer ring wall 2210. The first side wall 2211 and the mounting wall 30 are located on opposite sides of the stator 20 in the axial direction of the motor 2. The first side wall 2211 is connected to the opposite ends of the second outer ring wall 2210 away from the mounting wall 30. At one end, a rotating shaft 23 drives the plurality of fan blades 170 to rotate. The rotating shaft 23 is fixedly connected to the first side wall 2211, and the rotation axis A passes through the first side wall 2211. When the rotor 22 rotates, it drives the rotating shaft 23 to rotate through the rotor housing 221, and then the rotating shaft 23 drives the impeller 17 to rotate. The second outer ring wall 2210 is made of a magnetically conductive material. The first side wall 2211 and the second outer ring wall 2210 are integrally connected. The second outer ring wall 2210 extends from the outer periphery of the first side wall 2211 toward the mounting wall 30. The rotor housing 221 is made of a metal material, such as steel, specifically cold-rolled steel, which has better mechanical strength and can transmit larger torque more stably, ensuring that the rotor 22 stably transmits torque to the rotating shaft 23 to drive the rotating shaft 23 to rotate. The first side wall 2211 has a first fixing hole 2212 in the middle that mates with the rotating shaft 23. The rotating shaft 23 is interference-fitted with the first fixing hole 2212 to fix it to the first side wall 2211.

[0055] The motor 2 also includes wires (not shown) connecting to the stator 20. The fixing plate 4 has a first wiring hole 42, and the mounting wall 30 has a second wiring hole 306. The first wiring hole 42 and the second wiring hole 306 are positioned opposite each other, and the wires pass through both holes. The positioning bracket 21 includes several limiting protrusions 2140 and 2141, located at one end of the positioning bracket 21 at opposite ends along the axial direction of the motor 2. The fixing plate 4 has several limiting grooves 430 and 431 corresponding to the limiting protrusions 2140 and 2141. The protrusions 2140 and 2141 are embedded in corresponding limiting grooves 430 and 431 (the cooperation between the limiting protrusions 2140 and 2141 and the limiting grooves 430 and 431 serves as an initial limiting function between the positioning bracket 21 and the fixing plate 4, facilitating subsequent locking between the positioning bracket 21 and the fixing plate 4 using the first locking element 110); one of the limiting protrusions 2140 has a different size than the other limiting protrusions 2141, and a limiting groove 430 corresponding to one of the limiting protrusions 2140 has a different size than the other limiting grooves 431, to prevent mistaken assembly position between the positioning bracket 21 and the fixing plate 4. The mounting wall 30 also includes a mistaken-proof protrusion 307, which protrudes from the side of the mounting wall 30 opposite to the outer cover 12. The fixing plate 4 includes a mistaken-proof groove 44 corresponding to the mistaken-proof protrusion 307, and the mistaken-proof protrusion 307 is embedded in the mistaken-proof groove 44 to prevent mistaken assembly position between the fixing plate 4 and the mounting bracket 3. Based on the error-proofing of the assembly positions between the positioning bracket 21 and the fixing plate 4, and between the fixing plate 4 and the mounting bracket 3, the uniqueness of the assembly positions of the stator 20, the fixing plate 4, and the mounting bracket 3 is ensured. This achieves the uniqueness of the relative positions of the stator 20's connection point with the wire, the first wiring hole 42, and the second wiring hole 306. This facilitates the design where the connection point of the stator 20 with the wire is very close to the second wiring hole 306, reducing the length of the wire and facilitating wire exit. The first wiring hole 42 and the second wiring hole 306 also provide ventilation and heat dissipation. The stator 20 is electrically connected to the main control board 15 via wires.

[0056] The wires are electrically connected between the main control board 15 and the coil winding 200. The mounting bracket 3 also includes a back plate 32, which abuts against the air intake grille 10. The mounting bracket 3 is also provided with a cable routing channel 33, along which a portion of the wire extends. The cable routing channel 33 is located radially outside the first outer ring wall 31 and passes through opposite sides of the mounting bracket 3 in the axial direction of the motor 2. One end 330 of the cable routing channel 33 is opposite to the other end 33. 31 is located near the first wiring hole 42. The other end 331 of the wiring channel 33 is located on the back plate 32. The wire extends from the side of the mounting wall 30 facing the coil winding 200 to the side of the fixing plate 4 opposite to the coil winding 200 via the second wiring hole 306 and the first wiring hole 42. The wire passes through the second wiring hole 306, the first wiring hole 42, one end 330 of the wiring channel 33, and the other end 331 of the wiring channel 33 in sequence. The main control board 15 is located between the back plate 32 and the outer casing 12. This design improves the routing of the wires; one end of the wire is connected to the main control board 15, and the other end of the wire is connected to the coil winding 200.

[0057] The impeller 17 includes a hub 171, and a rotating shaft 23 is fixedly connected to the hub 171. The hub 171 includes a third outer ring wall 1710 and a second side wall 1711. The third outer ring wall 1710 surrounds the rotating shaft 23. The mounting wall 30 and the fixing plate 4 are located inside the hub 171. The third outer ring wall 1710 surrounds the first outer ring wall 31 and is spaced apart from the first outer ring wall 31. The plurality of fan blades 170 are distributed on the periphery of the hub 171 and connected to the third outer ring wall 1710. The second side wall 1711 is integrally connected to the third outer ring wall 1710. The rotating shaft 23 passes through the second side wall 1711 and is fixed together with the second side wall 1711. The fixing plate 4 is located between the second side wall 1711 and the mounting wall 30. The second side wall 1711, the fixing plate 4, the mounting wall 30, and the stator core 201 are distributed in sequence. The second sidewall 1711, the fixing plate 4, the mounting wall 30, the stator core 201, and the first sidewall 2211 are distributed sequentially along the axial direction of the motor 2. The second sidewall 1711 has a second fixing hole 1712 in the middle that mates with the rotating shaft 23, and the rotating shaft 23 passes through the second fixing hole 1712.

[0058] The fan 1 also includes several third locking elements 112. The mounting bracket 3 is fixed to the air inlet grille 10 by means of the several third locking elements 112. The first outer ring wall 31 extends integrally from the back plate 32 in a direction away from the outer cover 12. The mounting wall 30 is located at the end of the first outer ring wall 31 away from the back plate 32. The third locking elements 112 are metal screws or metal bolts.

[0059] The mounting bracket 3 is fixed to the air inlet mesh cover 10. The air inlet mesh cover 10 is a metal mesh cover (preferably a wire mesh cover). The air inlet mesh cover 10 is provided with a plurality of first positioning legs 100 corresponding to the plurality of third locking elements 112 and a third mounting port 101. The mounting bracket 3 passes through the third mounting port 101. The plurality of first positioning legs 100 are adjacent to the third mounting port 101. The plurality of first positioning legs 100 are located on the side of the back plate 32 opposite to the outer cover 12. Each third locking element 112 passes through its corresponding third locking element 112. The mounting bracket 3 is locked to the plurality of first positioning legs 100 by means of the plurality of third locking elements 112, and thus fixed to the air inlet mesh cover 10. One end of the connecting back plate 32 of the first outer ring wall 31 is adjacent to the third mounting port 101. The plurality of first positioning legs 100 are distributed on the periphery of one end of the connecting back plate 32 of the first outer ring wall 31. This layout facilitates the installation and fixation between the mounting bracket 3 and the air inlet mesh cover 10.

[0060] The mounting wall 30 has at least one first heat dissipation hole 308, and the fixing plate 4 has at least one second heat dissipation hole 45 corresponding to the at least one first heat dissipation hole 308. At least one third heat dissipation hole 50 is formed at the junction of the first outer ring wall 31 and the back plate 32, and at least one fourth heat dissipation hole 51 is formed at the junction of the first outer ring wall 31 and the mounting wall 30, thereby improving the heat dissipation of the motor 2. The second side wall 1711 has at least one fifth heat dissipation hole 1713. The first side wall 2211 has at least one sixth heat dissipation hole 2213.

[0061] The stator 20 also includes an insulating shell layer 202 that serves as an insulating barrier between the stator core 201 and the coil winding 200. The insulating shell layer 202 is an insulating layer formed by spraying insulating powder onto the stator core 201, and the thickness of the insulating shell layer 202 is approximately 0.3-0.5 mm.

[0062] The fan 1 also includes a fan duct 180 and an exhaust screen 181. The fan duct 180 surrounds the rotation axis A of the motor 2 and surrounds the plurality of fan blades 170. The plurality of fan blades 170 are located between the air inlet screen 10 and the air outlet screen 181. The air inlet screen 10 and the air outlet screen 181 are respectively installed and fixed to the fan duct 180. The airflow generated by the rotation of the impeller 17 is blown out through the air outlet screen 181. During installation, the fixing plate 4 is first fixed to the mounting wall 30 using the plurality of second locking elements 111; then the motor 2 is installed as a whole onto the fixing plate 4—that is, the first end 210 of the positioning bracket 21 is installed and fixed to the fixing plate 4; then the mounting bracket 3 is installed and fixed to the air inlet screen 10.

Claims

1. A fan, characterized by: The motor includes a stator, a rotor, the stator includes a coil winding, a stator core, a fixed positioning support for the stator, the fixed plate is located on one side of the stator in the axial direction of the motor, the positioning support surrounds the rotation axis, the fixed plate is made of metal material, the positioning support is made of metal material, the fixed plate is fixed to the mounting support, and the positioning support is fixedly mounted to the fixed plate.

2. The fan of claim 1, wherein: The rotor includes a rotating shaft, the rotating shaft penetrates the fixed plate, the positioning support is cylindrical, the positioning support surrounds the rotating shaft, the positioning support has a first end, the first end is one end of the positioning support in the axial direction of the motor, the first end is fixedly mounted to the fixed plate, the mounting support includes a mounting wall, the fixed plate is located on one side of the mounting wall in the axial direction of the motor, the side faces away from the coil winding and the stator core, the fixed plate is fixedly mounted to the mounting wall, and the mounting wall has an inner periphery surrounding the rotation axis, and the inner periphery of the mounting wall surrounds the first end of the positioning support.

3. The fan of claim 1, wherein: The stator core forms a first mounting opening corresponding to the positioning support, a portion of the positioning support is mounted into the first mounting opening and fixed with the stator core, the first mounting opening includes at least one guide groove, the positioning support includes at least one guide rail corresponding to the at least one guide groove, the at least one guide rail is located on the outer periphery of the positioning support, the guide groove penetrates the stator core in the axial direction of the motor, and the at least one guide groove and the at least one guide rail are used to guide the positioning support to be mounted to the first mounting opening, and the at least one guide rail is embedded in the corresponding at least one guide groove.

4. The fan of claim 3, wherein: The positioning support is partially pressed into the first mounting opening and fixed together with the stator core in interference fit, the positioning support includes a plurality of stop protrusions, the plurality of stop protrusions are located on the outer periphery of the positioning support, the guide rail is integrally extended from the corresponding stop protrusion, and the plurality of stop protrusions are stopped on one side of the stator core in the axial direction of the motor to prevent the positioning support from being excessively mounted into the first mounting opening.

5. The fan of claim 1, wherein: It also includes a plurality of first locking elements and a plurality of second locking elements, the fixed plate is fixedly mounted to the mounting support, the fixed plate has a plurality of first mounting holes corresponding to the plurality of first locking elements and a plurality of second mounting holes corresponding to the plurality of second locking elements, the plurality of first locking elements are used to lock the positioning support to the fixed plate, the plurality of second locking elements are used to lock the fixed plate to the mounting support, the mounting support is made of plastic material, and the vertical distance from each second locking element to the rotation axis is greater than the vertical distance from each first locking element to the rotation axis.

6. The fan of claim 5, wherein: The vertical distance from each of the second mounting holes to the rotation axis is greater than the vertical distance from each of the first mounting holes to the rotation axis; the first locking elements, the first mounting holes are distributed on a first circle around the rotation axis, the second locking elements, the second mounting holes are distributed on a second circle around the rotation axis, the radius of the second circle is greater than that of the first circle, and the second circle and the first circle have the rotation axis as the central axis; each of the first locking elements penetrates through a corresponding first mounting hole, and each of the second locking elements penetrates through a corresponding second mounting hole.

7. The fan of claim 5, wherein: The rotation axis is perpendicular to the fixed plate, each of the second locking elements and a corresponding one of the first locking elements are on a virtual plane to which the rotation axis belongs; each of the second mounting holes and a corresponding one of the first mounting holes are on a virtual plane to which the rotation axis belongs; in the radial direction of the motor, each of the second locking elements is located outside a corresponding one of the first locking elements; in the radial direction of the motor, each of the second mounting holes is located outside a corresponding one of the first mounting holes; the first locking elements are uniformly distributed on a circle around the rotation axis, the second locking elements are uniformly distributed on a circle around the rotation axis; the first mounting holes are uniformly distributed on a circle around the rotation axis, and the second mounting holes are uniformly distributed on a circle around the rotation axis.

8. The fan of claim 5, wherein: The first locking elements are metal screws or metal bolts, and the second locking elements are metal screws or metal bolts.

9. The fan of claim 1, wherein: The installation support is located between the plurality of fan blades and the outer shell, the installation support and the outer shell are assembled and fixed together to form a box shape; the control switch is exposed on the side of the outer shell opposite to the installation support, the installation support is a single plastic part formed integrally; the rotor, the stator, and the fixed plate are located in the accommodation space surrounded by the outer shell and the installation support.

10. The fan of claim 9, wherein: The fan is an AC / DC dual-purpose fan, the electric connection port is used to obtain external AC power supply; the battery pack slot can be plugged with an external battery pack, the electric connection port and the battery pack slot are exposed on the side of the outer shell opposite to the installation support, the battery pack slot intersects with the vertical plane in which the rotation axis is located, and the battery pack slot intersects with the rotation axis or does not intersect with the rotation axis and is located below the rotation axis.

11. The fan of claim 1, wherein: The mounting bracket comprises a mounting wall made of plastic material, the fixing plate is attached to the mounting wall, the mounting wall is located on one side of the stator in the axial direction of the motor, the fixing plate is fixedly mounted on the mounting wall, the fixing plate has a plurality of first mounting holes corresponding to the plurality of first locking elements and a plurality of second mounting holes corresponding to the plurality of second locking elements, the plurality of first locking elements are used to lock the positioning bracket to the fixing plate, the plurality of second locking elements are used to lock the fixing plate to the mounting wall, and the mounting wall is provided with a plurality of third mounting holes corresponding to the plurality of second locking elements and the plurality of second mounting holes.

12. The fan of claim 11, wherein: The fixing plate, the mounting wall, and the stator core are sequentially arranged in the axial direction of the motor, the mounting wall has a second mounting opening through which the rotation axis penetrates, and the positioning bracket is partially accommodated in the second mounting opening; the mounting wall has an inner periphery surrounding the second mounting opening, and the inner periphery of the mounting wall surrounds the positioning bracket; the positioning bracket is provided with fourth mounting holes corresponding to the first mounting holes and the first locking elements, and each first locking element is at least partially accommodated in the corresponding fourth mounting hole; and the perpendicular distance from each third mounting hole to the rotation axis is greater than the perpendicular distance from each fourth mounting hole to the rotation axis.

13. The fan of claim 12, wherein: The positioning bracket comprises a plurality of locking portions, the fourth mounting holes are arranged in the corresponding locking portions, and each first locking element is locked in the corresponding locking portion; the positioning bracket is not in contact with the mounting wall, the second mounting opening comprises a plurality of accommodation grooves corresponding to the plurality of locking portions, the plurality of accommodation grooves are arranged on the inner periphery of the mounting wall, each locking portion is embedded in the corresponding accommodation groove, and each locking portion protrudes outward from one end of the positioning bracket.

14. The fan of claim 11, wherein: The motor further comprises an impeller, the impeller comprises the plurality of blades, the rotor comprises a rotating shaft for driving the impeller to rotate, and the rotation axis constitutes the central axis of the rotating shaft; the positioning bracket surrounds the rotating shaft, the motor further comprises at least one bearing accommodated in the space surrounded by the positioning bracket, the rotating shaft penetrates through the at least one bearing, the at least one bearing is used for the rotational connection between the rotating shaft and the positioning bracket, the rotating shaft penetrates through the fixing plate, the mounting wall, and the positioning bracket, the rotating shaft is perpendicular to the fixing plate, and the perpendicular distance from each second mounting hole to the rotation axis is greater than the perpendicular distance from each first mounting hole to the rotation axis.

15. The fan of claim 11, wherein: The mounting bracket comprises a first outer ring wall integrally connected with the mounting wall, and the first outer ring wall surrounds the motor.

16. The fan of claim 15, wherein: The rotor comprises a magnet and a rotating shaft, the rotating shaft penetrates through the fixing plate and the mounting wall, the fixing plate and the mounting wall are attached together in the axial direction of the motor, and the rotating shaft is perpendicular to the fixing plate; the mounting wall is provided with an annular protruding portion protruding from the side of the mounting wall opposite to the coil winding and the stator core, and the fixing plate is embedded in the area surrounded by the annular protruding portion.

17. The fan of claim 15, wherein: The stator is at least partially accommodated in a space surrounded by the rotor, the motor is an outer rotor motor, and the rotor comprises a magnet.

18. The fan of claim 15, wherein: The rotor comprises a magnet, a rotor shell, and a rotating shaft. The magnet is fixedly arranged in the rotor shell. The rotor shell comprises a second outer ring wall and a first side wall. The first outer ring wall is spaced apart from the second outer ring wall and located at the periphery of the second outer ring wall. The magnet is located between the periphery of the stator core and the second outer ring wall. The magnet is composed of an annular magnetic steel and is attached to the inner circumferential surface of the second outer ring wall. The first side wall and the mounting wall are located on opposite sides of the stator in the axial direction of the motor. The first side wall is connected to one end of the second outer ring wall that is away from the mounting wall. The rotating shaft is used to drive the plurality of fan blades to rotate. The rotating shaft is fixedly connected to the first side wall. When the rotor rotates, the rotating shaft rotates through the rotor shell. The first side wall and the second outer ring wall are integrally connected. The second outer ring wall extends from the outer periphery of the first side wall towards the mounting wall. The rotor shell is made of a metal material.

19. The fan of claim 15, wherein: The motor further comprises an electric wire connected to the stator. The fixing plate is provided with a first wire hole. The mounting wall is provided with a second wire hole. The first wire hole and the second wire hole are in position correspondence. The electric wire penetrates through the first wire hole and the second wire hole. The mounting bracket further comprises a back plate. The mounting bracket is back-leaned against the air inlet net cover through the back plate. The mounting bracket is further provided with a wire channel. A part of the electric wire extends along the wire channel. The wire channel is located on the radial outside of the first outer ring wall. The wire channel penetrates through the opposite sides of the mounting bracket in the axial direction of the motor. One end of the wire channel is closer to the first wire hole than the other end of the wire channel. The other end of the wire channel is provided on the back plate. The electric wire extends from the side of the mounting wall facing the coil winding to the side of the fixing plate away from the coil winding via the second wire hole and the first wire hole. The electric wire penetrates through the second wire hole, the first wire hole, the one end of the wire channel, and the other end of the wire channel in sequence.

20. The fan of claim 19, wherein: The motor further comprises a main control board and an outer shell. The mounting bracket and the outer shell are assembled and fixed together. The electric wire is electrically connected between the main control board and the coil winding. The main control board is located between the back plate and the outer shell. The positioning bracket comprises a plurality of limiting protrusions. The plurality of limiting protrusions are located on one end of the positioning bracket in the axial direction of the motor. The fixing plate has a plurality of limiting grooves corresponding to the plurality of limiting protrusions. The limiting protrusions are embedded in the corresponding limiting grooves. One of the limiting protrusions is different in size from the other limiting protrusions. A limiting groove corresponding to the one limiting protrusion is different in size from the other limiting grooves. This is used to prevent the assembly position between the positioning bracket and the fixing plate from being mistaken.

21. The fan of claim 15, wherein: The impeller comprises the plurality of blades, a hub, the rotor comprises a rotating shaft, the hub comprises a third outer ring wall, a second side wall, the third outer ring wall surrounds the rotating shaft, the fixing plate and the mounting wall are located in the hub, the third outer ring wall surrounds the first outer ring wall and is spaced apart from the first outer ring wall, and the plurality of blades are distributed on the periphery of the hub and are connected to the third outer ring wall; the second side wall is integrally connected with the third outer ring wall, the rotating shaft penetrates through the second side wall and is fixed together with the second side wall, and the fixing plate is located between the second side wall and the mounting wall; the second side wall, the fixing plate, the mounting wall and the stator core are sequentially distributed.

22. The fan of claim 15, wherein: The mounting bracket is fixed to the air inlet mesh cover by the plurality of third locking elements, the mounting bracket further comprises a back plate, the mounting bracket is abutted against the air inlet mesh cover through the back plate, the first outer ring wall is integrally extended from the back plate in a direction away from the outer shell, and the mounting wall is located at an end of the first outer ring wall away from the back plate.

23. The fan of claim 22, wherein: The mounting bracket is fixed to the air inlet mesh cover, the air inlet mesh cover is a metal mesh cover, the air inlet mesh cover is provided with a plurality of first positioning feet and a third mounting opening corresponding to the plurality of third locking elements, the mounting bracket penetrates through the third mounting opening, the plurality of first positioning feet are adjacent to the third mounting opening, the plurality of first positioning feet are located on a side of the back plate away from the outer shell, the mounting bracket is locked to the plurality of first positioning feet by the plurality of third locking elements and is fixed to the air inlet mesh cover, and the end of the first outer ring wall connected to the back plate is adjacent to the third mounting opening.

24. The fan of claim 22, wherein: The mounting wall is provided with at least one first heat dissipation hole, the fixing plate is provided with at least one second heat dissipation hole corresponding to the at least one first heat dissipation hole, the junction of the first outer ring wall and the back plate is provided with at least one third heat dissipation hole, and the junction of the first outer ring wall and the mounting wall is provided with at least one fourth heat dissipation hole.

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