A DC brushless motor cooling fan with high conical stator stability

Abstract

The present invention relates to the technical field of DC brushless motor cooling fans, specifically a DC brushless motor cooling fan with high stability of a conical stator, comprising a base frame, a sleeve is arranged at the center position of the top of the base frame, a bearing, the bearing is installed on the inner wall of the sleeve, an axis, the axis is fixed in the bearing, one end of which is plugged into the base frame, a tapered stator, the tapered stator is fixed on the outer wall of the sleeve, a motor shell, the motor shell is fixed on the top, a conical magnet, the conical magnet is combined on the inner wall of the motor shell, and a PCBA board, the PCBA board is arranged at the bottom of the tapered stator. The present invention uses the interaction of magnetic repulsion between the conical magnet and the conical stator, the magnetic repulsion of the conical magnet on the conical stator obliquely presses the conical stator downward, forcing the conical stator to have a downward movement trend, and secondly the PCBA board and the conical stator form a magnetic attraction constraint structure, thereby increasing the stability of the rotor.

Description

Technical Field

[0001] The invention relates to the technical field of a brushless DC motor cooling fan, in particular to a brushless DC motor cooling fan with a conical stator and high stability. Background Art

[0002] When the axial flow fan is working, the blades push the air to flow in the same direction as the axis, so it is called a brushless DC motor cooling fan. Brushless DC motor cooling fans are divided into large brushless DC motor cooling fans, medium brushless DC motor cooling fans, and small brushless DC motor cooling fans. Choose the appropriate brushless DC motor cooling fan according to the required place of use. Generally speaking, large brushless DC motor cooling fans are mainly suitable for exhaust in places such as dust and gravel fields; medium brushless DC motor cooling fans are mainly suitable for indoor ventilation and heat dissipation, such as granaries; small brushless DC motor cooling fans are mainly suitable for ventilation and heat dissipation of mechanical equipment, such as electrical cabinets.

[0003] Since the wind pressure of a traditional turbo fan is not generated in the center of the fan, but by the rotation of the fan blades, no matter how high the speed is, there will be no wind blowing down from the axis. However, the heat core is located under the fan axis, which is the main source of heat. This situation has caused the inherent defects of the traditional DC brushless motor cooling fan: blocked by the motor, the airflow cannot reach the center smoothly, resulting in a "blind spot". The existence of the blind spot causes the core part of the radiator to have a high temperature, affecting the overall heat dissipation effect.

[0004] The Chinese invention patent with application number CN201310561565.2 discloses an axial flow fan, which includes: an impeller and a fan frame. The impeller has a first outer diameter. The fan frame includes a first frame body and a second frame body, the first frame body includes a plurality of connectors and a base, the connectors are connected to the base, the second frame body is a hollow frame body, which is used to be arranged around the impeller, and the second frame body has a flow channel, and a first inner diameter of the flow channel is not greater than the first outer diameter of the impeller. The axial flow fan of the present invention utilizes the first frame body and the second frame body to form the fan frame, so that the first inner diameter of the flow channel of the second frame body is not greater than the maximum outer diameter of the impeller, so that the size of the second frame body will not limit the maximum outer diameter of the impeller, and the shape of the impeller and the shape of the housing can be flexibly designed according to actual needs.

[0005] The Chinese invention patent with application number CN201911168261.3 discloses a brushless motor stator assembly for an automobile cooling fan, including a stator shell, a stator assembly and a PCBA assembly. The stator assembly is embedded in the stator shell. The stator assembly includes a stator core, a front insulating end cover and a rear insulating end cover arranged at the front and rear ends of the stator core. A stator winding is arranged between the front insulating end cover and the rear insulating end cover. Three or six metal hooks are fixed on the rear insulating end cover. The stator winding is wound according to the winding rule and crosses the metal hook and is clamped and welded to it, so that the stator winding forms a three-phase winding; a conductive bracket is fixed on the rear insulating end cover. The conductive bracket is fixed on the rear insulating end cover. The electrical bracket is provided with a through hole for the convenient passage of the protective hook. The rear end of the conductive bracket is detachably fixed with a PCBA board, and the PCBA board is provided with a welding through hole. The metal protective hook passes through the welding through hole and is welded and electrically connected with the PCBA board. The metal protective hook includes a protective hook body, the front end of the protective hook body is fixed with the rear insulating end cover, and the outer side of the protective hook body is provided with a hook portion for convenient winding. The protective hook body is a plate-like structure, and the front end of the protective hook body is opened to have two strip-like openings extending forward and backward. The plate portion between the strip-like openings is bent outward to form the hook portion, and the front ends of the protective hook body are provided with inverted tooth structures, and the surface of the rear insulating end cover is provided with an embedding groove.

[0006] However, in the process of implementing the above scheme, the stator device and magnet sleeved on the outer side of the axial flow fan axis are of regular structure, and the center of gravity of the stator and the magnet are centered. The stator and the magnet will force the stator to generate stress during rotation, making the stator unstable, thereby causing the DC brushless motor cooling fan to be noisy.

[0007] Therefore, a brushless DC motor cooling fan with a conical stator and high stability is proposed. Summary of the invention

[0008] The invention relates to the technical field of a brushless DC motor cooling fan, and aims to solve the shortcomings of the prior art by proposing a brushless DC motor cooling fan with a conical stator and high stability.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A brushless DC motor cooling fan with a conical stator and high stability, comprising:

[0011] A base frame, wherein a shaft sleeve is arranged at the center of the top of the base frame;

[0012] A bearing, wherein the bearing is mounted on the inner wall of the sleeve and the bearing is freely rotatable inside the sleeve;

[0013] A shaft, the shaft is fixed in the bearing, and one end of the shaft is plugged into the base frame;

[0014] A tapered stator, wherein the tapered stator is fixed on the outer wall of the shaft sleeve;

[0015] The stator is an important part of the cooling fan. Its main function is to assist the stator winding group to generate a rotating magnetic field and drive the rotor to rotate at high speed. Most of the stators commonly seen on the market have a halo on the surface, which makes it easy for the enameled wire to be unevenly stacked during winding, affecting the tightness and density of the winding. It does not have the function of preventing winding from misalignment.

[0016] The front and rear shot packages of the sand steel sheet of the stator adopted in this solution are not only connected by bolts, so that it has the function of fixing the front and rear shot packages to prevent them from falling off. During the driving process of the cooling fan, the rotor rotates at a high speed in the empty slot in the center of the stator to avoid axial deviation, thereby avoiding wear on the enameled wire and sand steel sheet inside the stator; the sand steel sheets of the tapered stator are stacked in sequence, and the shapes of their internal brackets match each other, and are injection-molded into external brackets of several sand steel sheets, thereby improving the overall stability of the frame.

[0017] The magnetic repulsion between the conical magnet and the conical stator interacts with each other. The magnetic repulsion of the conical magnet on the conical stator obliquely presses the conical stator downward, forcing the conical stator to move downward, thereby increasing the stability of the conical stator and facilitating the formation of a stable magnetic field. The coil is conveniently fixed close to the axis, making the overall structure of the conical stator compact, so as to facilitate the positioning and fixing of the conical stator.

[0018] A motor housing, the motor housing and the shaft are mutually engaged and fixed to the top of the shaft;

[0019] The base frame and the axis are combined to form the overall frame, and the shapes of the fan blades and the motor housing can be flexibly designed according to actual needs. In addition, the base frame and the motor housing can be combined or disassembled by utilizing the structure of the base frame and the motor housing.

[0020] A conical magnet, wherein the conical magnet is combined with the inner wall of the motor housing;

[0021] The PCBA board is arranged at the bottom of the tapered stator, and the PCBA board is sleeved on the outside of the shaft sleeve.

[0022] Preferably, the thickness of the upper portion of the conical magnet is greater than that of the lower portion.

[0023] Preferably, the outer diameter of the tapered stator increases from top to bottom.

[0024] Preferably, a lower gasket and an upper gasket are provided at the bottom and the top of the bearing in sequence, and both the lower gasket and the upper gasket are sleeved on the outside of the shaft center.

[0025] The lower gasket and the upper gasket are arranged at the bottom and the top of the bearing respectively, and the lower gasket and the upper gasket are sleeved on the outside of the axis. The bearing is fixed by the cooperation of the lower gasket and the upper gasket, which has a good sealing effect, reduces the volatilization of oil in the bearing, prevents dust from entering the bearing, and prolongs the service life of the bearing.

[0026] Preferably, the motor housing comprises a hub and a plurality of blades, and the plurality of blades are equidistantly arranged on the circumferential outer wall of the hub.

[0027] Preferably, the PCBA board is a magnetic structure, and the PCBA board and the tapered stator form a magnetic attraction constraint structure.

[0028] The PCBA board is provided with welding through holes, and a centralized wiring area is provided on the back of the PCBA board. A wiring bracket is provided on the centralized wiring area. Several conductive pins on the wiring bracket are welded and fixed to the PCBA board. When the stator winding is wound, it crosses the metal hook, and the metal hook can clamp the winding. Then, the winding will be broken during clamping and welding. In this way, the welding conductive connection of the corresponding end is completed, thereby realizing the three-phase winding. The winding of the entire stator assembly is more convenient and neater. At the same time, there is no need to use copper rings, which saves manpower. The winding can be directly wound and then automatically clamped and welded, which is more efficient. The welding through holes facilitate the welding conductive connection of the PCBA board. A centralized wiring area is provided on the back of the PCBA board. A wiring bracket is provided on the centralized wiring area. Several conductive pins on the wiring bracket are welded and fixed to the PCBA board. The conductive pins can be well integrated by using the wiring bracket, which makes it more convenient to connect the PCBA board with external wires.

[0029] Compared with the traditional structure in which the stator and the PCBA board are fixed by welding, the positioning and assembly of the present invention is fast and stable. The bonding force between the tapered stator and the PCBA board is fixed by welding points, which strengthens the bonding force between the tapered stator and the PCBA board, avoids the risk of falling off, and is beneficial to increasing the stability and life of the combined structure between the tapered stator and the PCBA board.

[0030] Preferably, a spring is provided between the motor housing and the upper gasket, and the spring is sleeved on the upper outer wall of the shaft.

[0031] Preferably, the fixing structure includes a rotating groove of an arc-shaped structure provided at the four corners of the lower end surface of the base frame, an ear plate is rotatably connected inside the rotating groove, and a second mounting hole is provided at the rotating connection of the ear plate, a corresponding hole is provided on the base frame at a position corresponding to the second mounting hole, the base frame is rotatably connected to the ear plate through a bearing, a mounting hole one is provided at a position of the ear plate away from the second mounting hole, a strong magnet is embedded in the lower end surface of the ear plate, a movable groove of an arc-shaped structure is symmetrically provided inside the ear plate at a position outside the second mounting hole, an extrusion plate is movably connected in the movable groove, and an airbag is provided at the upper end of the extrusion plate, a conical cylinder is fixed to the upper end surface of the ear plate at a position corresponding to the movable groove, an expansion bag is glued to the inner side of the conical cylinder, and the expansion bag is connected to the airbag.

[0032] During operation, when the reserved installation holes on the object to be installed correspond to the holes and the second installation hole on the base frame, the user can insert the screws directly into the holes and thread them together with the object to be installed through the second installation hole, and the ear plate will be squeezed during the further installation process. At this time, the squeezing plate moves upward relatively inside the movable groove, and then squeezes the airbag inside the movable groove. The gas in the airbag is compressed and enters the interior of the expansion bag. Then the expansion bag expands and wraps the area of ​​the screw that has passed through, forming a sealing and waterproof effect, avoiding water from entering the threaded connection between the screw and the hole of the object to be installed and causing rust, which is convenient for subsequent users to disassemble. At the same time, when the reserved installation holes on the object to be installed do not correspond to the holes and the second installation hole on the base frame, the user can rotate the ear plate inside the rotating groove, make the mounting hole one on the ear plate correspond to the hole on the object to be installed, and then perform the screw installation steps to solve the problem that the object to be installed cannot be installed due to the mismatch between the mounting hole of the device.

[0033] Beneficial effects of the present invention:

[0034] The thickness of the upper part of the conical magnet is greater than that of the lower part. The outer diameter of the conical stator increases from top to bottom. The center of gravity of the conical stator moves downward. The magnetic repulsion between the conical magnet and the conical stator interacts with each other. The magnetic repulsion of the conical magnet on the conical stator tilts downward to press the conical stator, forcing the conical stator to move downward. Secondly, the PCBA board and the conical stator form a magnetic attraction constraint structure, thereby increasing the stability of the conical stator.

[0035] Compared with the traditional structure in which the stator and the PCBA are fixed by welding, the positioning and assembly of the present invention is fast and stable. The bonding force between the tapered stator and the PCBA is fixed by welding points, which strengthens the bonding force between the tapered stator and the PCBA, avoids the risk of falling off, and is conducive to increasing the stability and life of the combined structure between the tapered stator and the PCBA.

[0036] The PCBA board is provided with welding through holes, and a centralized wiring area is provided on the back of the PCBA board. A wiring bracket is provided on the centralized wiring area. Several conductive pins on the wiring bracket are welded and fixed to the PCBA board. When the stator winding is wound, it crosses the metal hook, and the metal hook can clamp the winding. Then, when the clamping welding is performed, the winding will be broken. In this way, the welding conductive connection of the corresponding end is completed, thereby realizing the three-phase winding. The winding of the entire stator assembly is more convenient and neater. At the same time, there is no need to use copper rings, which saves manpower. The winding can be directly wound and then automatically clamped and welded, which is more efficient. The welding through holes facilitate the welding conductive connection of the PCBA board. A centralized wiring area is provided on the back of the PCBA board. A wiring bracket is provided on the centralized wiring area. Several conductive pins on the wiring bracket are welded and fixed to the PCBA board. The conductive pins can be well integrated by using the wiring bracket, which is more convenient for the PCBA board to connect with external wires.

[0037] The lower gasket and the upper gasket are arranged at the bottom and the top of the bearing respectively, and the lower gasket and the upper gasket are sleeved on the outside of the axis. The lower gasket and the upper gasket are used to fix the bearing, which has a good sealing effect, reduces the oil volatilization in the bearing, prevents dust from entering the bearing, and prolongs the service life of the bearing;

[0038] By designing a fixing structure, the screw connections between the base frame and external objects can be sealed to achieve a waterproof effect and reduce the chance of screw rust. The ear plate design can increase the fixation of the device to different installation positions and improve the applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the internal cross-sectional structure of the present invention.

[0040] Figure 2 A bottom view of the present invention;

[0041] Figure 3 It is a schematic diagram of the cross-sectional structure of the fixed structure of the present invention;

[0042] Figure 4 It is a three-dimensional diagram of the overall structure of the present invention;

[0043] Figure 5 It is a bottom view of the overall structure of the present invention.

[0044] In the figure: 1 base frame, 2 sleeve, 3 lower gasket, 4 bearing, 5 upper gasket, 6 axis, 7 tapered stator, 8 motor housing, 9 conical magnet, 10 fan blade, 11 PCBA board, 12 spring; 13 rotating groove; 14 ear plate; 15 mounting hole one; 16 strong magnet; 17 extrusion cylinder; 18 airbag; 19 movable groove; 20 mounting hole two; 21 conical cylinder; 22 expansion bag. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0047] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0049] Reference Figure 1 A DC brushless motor cooling fan with high stability of a conical stator comprises a base frame 1, a shaft sleeve 2 is arranged at the center of the top of the base frame 1, a bearing 4 is installed on the inner wall of the shaft sleeve 2, the bearing 4 rotates freely inside the shaft sleeve 2, and a shaft 6 is fixed in the bearing 4, and one end of the shaft 6 is plugged into the base frame 1;

[0050] The base frame 1 and the axis 6 are combined to form the overall frame, and the shapes of the fan blades 10 and the motor housing 8 can be flexibly designed according to actual needs. In addition, the structure of the base frame 1 and the motor housing 8 allows the base frame 1 and the motor housing 8 to be combined or disassembled.

[0051] The tapered stator 7 is fixed on the outer wall of the sleeve 2. The stator is an important component inside the cooling fan. Its main function is to assist the stator winding group to generate a rotating magnetic field and drive the rotor to rotate at high speed. Most of the stators commonly seen on the market have a halo on the surface, which makes it easy for the enameled wire to be unevenly stacked during winding, affecting the compactness and density of the winding, and does not have the function of facilitating winding and preventing misalignment.

[0052] The front and rear shot packages of the sand steel sheet of the stator adopted in this solution are not only connected by bolts, so that it has the function of fixing the front and rear shot packages to prevent them from falling off. During the driving process of the cooling fan, the rotor rotates at a high speed in the empty slot in the center of the stator to avoid axial deviation, thereby avoiding wear on the enameled wire and sand steel sheet inside the stator; the sand steel sheets of the tapered stator 7 are stacked in sequence, and the shapes of their internal brackets match each other, and are injection-molded into external brackets of several sand steel sheets, thereby improving the overall stability of the frame.

[0053] The motor housing 8 is engaged with the shaft 6 and fixed on the top of the shaft 6;

[0054] A conical magnet 9, the conical magnet 9 is combined with the inner wall of the motor housing 8;

[0055] The PCBA board 11 is arranged at the bottom of the tapered stator 7 , and the PCBA board 11 is sleeved on the outside of the shaft sleeve 4 .

[0056] Furthermore, the thickness of the upper part of the conical magnet 9 is greater than the thickness of the lower part thereof, the outer diameter of the conical stator 7 increases from top to bottom, and the center of gravity of the conical stator 7 moves downward, making the conical stator 7 more stable.

[0057] The magnetic repulsion between the conical magnet 9 and the conical stator 7 interacts with each other. The magnetic repulsion of the conical magnet 9 on the conical stator 7 tilts downward to press the conical stator 7, forcing the conical stator 7 to have a downward movement trend, thereby increasing the stability of the conical stator 7 and facilitating the formation of a stable magnetic field. The coil is conveniently fixed by being close to the axis 6, making the overall structure of the conical stator 7 compact, so as to facilitate positioning and fixing the conical stator 7.

[0058] Specifically, a lower gasket 3 and an upper gasket 5 are provided at the bottom and the top of the bearing 4 in sequence, and both the lower gasket 3 and the upper gasket 5 are sleeved on the outside of the shaft center 6 .

[0059] The bottom and top of the bearing 4 are sequentially provided with a lower gasket 3 and an upper gasket 5, and the lower gasket 3 and the upper gasket 5 are both sleeved on the outside of the shaft center 6. The bearing 4 is fixed by the cooperation of the lower gasket 3 and the upper gasket 5, so as to achieve a good sealing effect, reduce the volatilization of oil in the bearing, prevent dust from entering the bearing, and extend the service life of the bearing.

[0060] Specifically, the motor housing 8 includes a hub and a plurality of blades 10, and the plurality of blades 10 are equidistantly arranged on the circumferential outer wall of the hub.

[0061] Specifically, the PCBA board 11 is a magnetic structure, and the PCBA board 11 and the tapered stator 7 form a magnetic attraction constraint structure. A welding through hole is provided on the PCBA board 11, and a centralized wiring area is provided on the back of the PCBA board. A wiring bracket is provided on the centralized wiring area. Several conductive pins on the wiring bracket are welded and fixed to the PCBA board 11. When the stator winding crosses the metal hook during winding, the metal hook can clamp the winding, and then the winding will be broken during clamping welding, so that the welding conductive connection of the corresponding end is completed to achieve The three-phase winding is completed, and the winding of the entire stator assembly is more convenient and neater. At the same time, there is no need to use copper rings, which saves manpower. The winding can be directly performed and then automatically clamped and welded, which is more efficient. The welding through-hole facilitates the welding and conductive connection of the PCBA board 11. A centralized wiring area is provided on the back of the PCBA board 11, and a wiring bracket is provided on the centralized wiring area. Several conductive pins on the wiring bracket are welded and fixed to the PCBA board 11. The conductive pins can be well integrated by using the wiring bracket, which makes it more convenient to connect the PCBA board 11 with external wires.

[0062] Compared with the traditional structure in which the stator and the PCBA board 11 are fixed by welding, the positioning and assembly of the present invention is fast and stable. The bonding force between the tapered stator 7 and the PCBA board 11 is fixed by welding points, which strengthens the bonding force between the tapered stator 7 and the PCBA board 11, avoids the risk of falling off, and is beneficial to increase the stability and life of the combined structure between the tapered stator 7 and the PCBA board 11.

[0063] Specifically, a spring 12 is provided between the motor housing 8 and the upper gasket 5 , and the spring 12 is sleeved on the upper outer wall of the shaft core 6 .

[0064] Specifically, the fixed structure includes a rotating groove 13 of an arc-shaped structure opened at the four corners of the lower end surface of the base frame 1, an ear plate 14 is rotatably connected inside the rotating groove 13, and a mounting hole 20 is opened at the rotating connection of the ear plate 14, a corresponding hole is opened on the base frame 1 at a position corresponding to the mounting hole 20, the base frame 1 is rotatably connected to the ear plate 14 through a bearing, a mounting hole 15 is opened at a position of the ear plate 14 away from the mounting hole 20, a strong magnet 16 is embedded in the lower end surface of the ear plate 14, an movable groove 19 of an arc-shaped structure is symmetrically opened inside the ear plate 14 at a position outside the mounting hole 20, an extrusion plate 17 is movably connected in the movable groove 19, and an air bag 18 is arranged on the upper end of the extrusion plate 17, a conical cylinder 21 is fixed to the upper end surface of the ear plate 14 at a position corresponding to the movable groove 19, an expansion bag 22 is glued to the inner side of the conical cylinder 21, and the expansion bag 22 is connected to the air bag 18.

[0065] During operation, when the reserved installation hole position on the object to be installed corresponds to the hole position and the second installation hole 20 on the base frame, the user can directly insert the screw into the hole position through the second installation hole 20 and threadedly connect and fix it with the object to be installed, and the ear plate 14 will be squeezed during the further installation process. At this time, the squeezing plate 17 will move up relatively inside the movable groove 19, and then squeeze the air bag 18 inside the movable groove 19. The gas in the air bag 18 is compressed and enters the inside of the expansion bag 22, and then the expansion bag 22 expands and wraps the passed screw area to form a sealing and waterproof effect, avoiding water from entering the threaded connection between the screw and the hole position of the object to be installed and causing rust, which is convenient for subsequent users to disassemble. At the same time, when the reserved installation hole position on the object to be installed does not correspond to the hole position and the second installation hole 20 on the base frame, the user can rotate the ear plate 14 inside the rotating groove 13, and make the mounting hole 15 on the ear plate 14 correspond to the hole position on the object to be installed, and then perform the screw installation step to solve the problem that the object to be installed does not correspond to the mounting hole position of the device and cannot be installed;

[0066] When the present invention is used, the thickness of the upper part of the conical magnet 9 is greater than the thickness of the lower part thereof, the outer diameter of the conical stator 7 increases from top to bottom, the center of gravity of the conical stator 7 moves downward, the magnetic repulsion between the conical magnet 9 and the conical stator 7 interacts with each other, and the magnetic repulsion of the conical magnet 9 on the conical stator 7 tilts downward to press the conical stator 7, forcing the conical stator 7 to have a downward movement trend. Secondly, the PCBA board 11 and the conical stator 7 form a magnetic attraction constraint structure, thereby increasing the stability of the conical stator 7.

[0067] The product model provided by the present invention is only used for the technical solution according to the structural characteristics of the product. The product will be adjusted and modified after purchase to make it more matching and conforming to the technical solution of the present invention. It is a technical solution for the best application of the technical solution. The model of the product can be replaced and modified according to the required technical parameters, which is well known to the technical personnel in this field. Therefore, the technical personnel in this field can clearly obtain the corresponding use effect through the technical solution provided by the present invention.

[0068] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents. It will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A brushless DC motor cooling fan with high conical stator stability, characterized in that: include: A base frame (1), wherein a shaft sleeve (2) is arranged at the center position of the top of the base frame (1); A bearing (4), the bearing (4) being mounted on the inner wall of the shaft sleeve (2), and the bearing (4) being freely rotatable inside the shaft sleeve (2); An axis (6), wherein the axis (6) is fixed in the bearing (4), and one end of the axis (6) is plugged into the base frame (1); A tapered stator (7), wherein the tapered stator (7) is fixed on the outer wall of the shaft sleeve (2); A motor housing (8), wherein the motor housing (8) and the shaft (6) are mutually engaged and fixed to the top of the shaft (6); A conical magnet (9), wherein the conical magnet (9) is coupled to the inner wall of the motor housing (8); A PCBA board, wherein the PCBA board (11) is arranged at the bottom of the tapered stator (7), and the PCBA board (11) is sleeved on the outside of the shaft sleeve (2); The lower end surface of the base frame (1) is provided with a fixing structure at the corners around it. The fixing structure comprises a rotating groove (13) of an arc structure provided at four corners of the lower end surface of the base frame (1); an ear plate (14) is rotatably connected inside the rotating groove (13); a second mounting hole (20) is provided at a rotatably connected position of the ear plate (14); a corresponding hole is provided on the base frame (1) at a position corresponding to the second mounting hole (20); the base frame (1) is rotatably connected to the ear plate (14) via a bearing; The ear plate (14) is provided with a first mounting hole (15) at a position away from the second mounting hole (20), and a strong magnet (16) is embedded and connected to the lower end surface of the ear plate (14). The interior of the ear plate (14) is symmetrically provided with an arc-shaped movable groove (19) at a position outside the second mounting hole (20); an extrusion plate (17) is movably connected to the movable groove (19); an air bag (18) is arranged at the upper end of the extrusion plate (17); a conical cylinder (21) is fixed to the upper end surface of the ear plate (14) at a position corresponding to the movable groove (19); an expansion bag (22) is glued to the inner side of the conical cylinder (21); and the expansion bag (22) is connected to the air bag (18).

2. A brushless DC motor cooling fan with high conical stator stability according to claim 1, characterized in that: The thickness of the upper portion of the conical magnet (9) is greater than the thickness of the lower portion thereof.

3. A brushless DC motor cooling fan with high conical stator stability according to claim 1, characterized in that: The outer diameter of the tapered stator (7) increases from top to bottom.

4. A brushless DC motor cooling fan with high conical stator stability according to claim 1, characterized in that: A lower gasket (3) and an upper gasket (5) are arranged at the bottom and top of the bearing (4) in sequence, and the lower gasket (3) and the upper gasket (5) are both sleeved on the outside of the shaft center (6).

5. A brushless DC motor cooling fan with high conical stator stability according to claim 1, characterized in that: The motor housing (8) comprises a hub and a plurality of blades (10), and the plurality of blades (10) are arranged at equal distances on the circumferential outer wall of the hub.

6. A brushless DC motor cooling fan with high conical stator stability according to claim 1, characterized in that: The PCBA board (11) is a magnetic structure, and the PCBA board (11) and the tapered stator (7) form a magnetic attraction constraint structure.

7. A brushless DC motor cooling fan with a conical stator and high stability according to claim 4, characterized in that: A spring (12) is provided between the motor housing (8) and the upper gasket (5), and the spring (12) is sleeved on the upper outer wall of the shaft core (6).

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