A cooling fan with magnetic suspension structure

Abstract

The present invention relates to a heat dissipation fan with a magnetic suspension structure, wherein the fan frame is a plastic part, the fan frame is provided with a bottom and a peripheral wall part enclosed by the bottom, the inner center of the bottom protrudes upward to form a central axis; the motor coil is fixed on the outer periphery of the central axis and is conductively connected with a PCB board; the fan blades include a hub part and blades radially extending outward from the hub part, and the hub part is provided with an axis core and a rubber magnet; the fan blades are assembled on the fan frame, the axis core is aligned and assembled into an axis hole provided in advance in the central axis, and the rubber magnet surrounds the outer periphery of the motor coil; and the iron sheet is fixed on the bottom of the fan frame by injection molding, and the positive projection of the rubber magnet falls on the iron sheet; the rubber magnet, the motor coil and the iron sheet interact with each other to create a magnetic suspension and magnetic attraction working environment, and the fan blades rotate and operate in this working environment. The present invention has a simple structure and is convenient to manufacture and assemble. The magnetic suspension and magnetic attraction working environment will greatly reduce the friction between the axis core and the bearing, thereby reducing the noise of the fan and extending the working life of the fan.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation fans, and in particular to a magnetic heat dissipation fan. Background Art

[0002] In the prior art, in order to reduce the axial vibration generated by the rotation of the fan blades, so that the fan blades can rotate in a balanced and stable manner, a magnetic element is usually added to the cooling fan to absorb and pull the fan blades down. The structure of the existing magnetic fan on the market is that a piece of iron is set on the PCB board, and then it is fixed by the motor wire rack. This design has many disadvantages:

[0003] 1. Put the iron sheet close to the PCB board, which takes up a lot of space on the PCB, forcing the electronic components to avoid double-sided mounting, resulting in an increase in SMT costs.

[0004] 2. The iron sheet needs to reserve positioning holes for the wire rack and sensing holes for the fan Hall IC, which makes the entire iron sheet not a complete circle, and it produces different strengths of magnetic adsorption on the fan blades.

[0005] 3. The production process of assembling the positioning iron sheet is complicated and costly, and the iron sheet exposed to the outside is easily oxidized and has poor reliability. Summary of the invention

[0006] In order to overcome the problems and shortcomings of the above-mentioned magnetic suction fan, the present invention has improved the structure and designed a new type of heat dissipation fan with a magnetic suspension structure.

[0007] In order to achieve the above object, the present invention adopts the following technical scheme:

[0008] A heat dissipation fan with a magnetic suspension structure, comprising:

[0009] The fan frame is a plastic part, and is provided with a bottom and a peripheral wall portion surrounding the bottom, and the inner center of the bottom protrudes upward to form a central axis;

[0010] A motor coil, which is fixed to the outer periphery of the central shaft and is conductively connected to the PCB board;

[0011] The fan blade comprises a hub portion and blades radially extending outward from the hub portion, and the hub portion is provided with an axis core and a rubber magnet; the fan blade is assembled on the fan frame, the axis core is aligned and assembled into an axis hole provided in advance on the central axis, and the rubber magnet surrounds the periphery of the motor coil;

[0012] An iron sheet, which is fixed to the bottom of the fan frame by injection molding, and satisfies the requirement that the positive projection of the rubber magnet falls on the iron sheet;

[0013] The rubber magnet, the motor coil and the iron sheet interact with each other to create a working environment of magnetic levitation and magnetic attraction, and the fan blades rotate in this working environment.

[0014] The above solution is further characterized in that the iron sheet is fully embedded in the bottom of the fan frame.

[0015] The above solution is further that the iron sheet is fixed on the bottom of the fan frame in a semi-enclosed manner and is partially exposed on the inner side or outer side of the bottom.

[0016] The above scheme is further that a magnet is also provided on the bottom of the fan frame, the magnet is offset from the iron sheet, and the magnet is coaxially arranged with the axis core of the fan blade, so that the magnet magnetically attracts the fan blade.

[0017] The above scheme is further that the iron sheet is in a circular ring shape, the magnet is located exactly in the inner ring area of ​​the iron sheet, and the outer diameter of the magnet is larger than the diameter of the shaft core.

[0018] The above scheme is further that the shaft core of the fan blade is assembled into the shaft hole pre-provided in the central shaft through a hydraulic oil-containing bearing.

[0019] The above scheme is further that the inner bottom of the shaft hole is provided with a wear-resistant gasket, and the insertion end of the shaft core is abutted against the wear-resistant gasket.

[0020] The above scheme is further that the rubber magnet is made by evenly adding magnetic powder into the rubber, and after the jig is pressed into the iron shell, a closed ring of rubber is formed. After high-voltage magnetization, the magnetic powder will gather in the rubber with N / S polarity, thus forming a fixed annular magnetic field; and the motor coil forms a variable magnetic field by changing different winding impedance methods; thus, the fixed annular magnetic field covers the variable magnetic field, forming a magnetic levitation effect of attraction and repulsion.

[0021] The present invention realizes the magnetic attraction effect through the cooperation of the rubber magnet and the iron sheet, and the iron sheet is directly formed and fixed on the bottom when the bottom of the fan frame is formed, which not only simplifies the assembly of the iron sheet, simplifies the production process, and reduces the production cost; at the same time, it also ensures the integrity and reliability of components such as the PCB board, and ensures the usability and service life of the cooling fan. Furthermore, the iron sheet is fixed by injection molding, and the distance and strength of the magnetic attraction can be arbitrarily set according to needs to improve the magnetic attraction effect; at the same time, by setting the assembly size of the motor coil and the rubber magnet, an upward magnetic levitation force can be generated on the motor coil when the fan blade is running. When these two magnetic levitation and magnetic attraction forces reach a balanced boundary point, the fan blade can be placed in a suspended magnetic field to achieve the magnetic levitation effect. The structure of this magnetic field will greatly reduce the friction between the shaft core and the bearing, thereby reducing the noise of the fan and extending the working life of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attached Figure 1 It is a schematic structural diagram of one embodiment of the present invention;

[0023] Attached Figure 2 for Figure 1 A schematic cross-sectional view of the combined structure of an embodiment;

[0024] Attached Figure 3 It is a schematic cross-sectional view of the combined structure of the second embodiment of the present invention. DETAILED DESCRIPTION

[0025] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention.

[0026] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0027] See also Figure 1 , 2, 3 are schematic diagrams of preferred embodiments of the present invention. The present invention is related to a heat dissipation fan with a magnetic levitation structure, which has a fan frame 1, fan blades 3, a motor coil 2, a PCB board 8 and an iron sheet 4. The fan frame 1 is a plastic part, which is obtained by integral molding or split molding and then assembled. The fan frame 1 is provided with a bottom 11 and a peripheral wall portion 12 enclosed by the bottom 11. The inner center of the bottom 11 protrudes upward to form a central axis 13, and an assembly space is reserved between the outer periphery of the central axis 13 and the peripheral wall portion 12. The motor coil 2 is assembled in the assembly space and fixed on the outer periphery of the central axis 13. The motor coil 2 is conductively connected to the PCB board 8 to obtain power. In this embodiment, the motor coil 2 is connected to the PCB board 8 to form a whole and then assembled into the fan frame 1. The fan blade 3 includes a hub portion 31 and blades 32 extending radially outward from the hub portion 31. The hub portion 31 is provided with an axis core 33 and a rubber magnet 34. The fan blade 3 is assembled on the fan frame 1. The axis core 33 is aligned and assembled into the axis hole 131 provided in advance by the central axis 13. The rubber magnet 34 surrounds the periphery of the motor coil 2, and the fan blade 3 is driven to rotate by the motor coil 2. The specific working principle of the rotation of the fan blade 3 is the prior art and will not be repeated here. The iron sheet 4 is fixed on the bottom 11 of the fan frame 1 by injection molding, and the positive projection of the rubber magnet 34 falls on the iron sheet 4. The magnetic attraction generated between the iron sheet 4 and the rubber magnet 34 is used to reduce the axial vibration generated when the fan blade rotates, so that the fan blade can rotate in a balanced and stable manner, and a magnetic attraction type heat dissipation fan is obtained. The iron sheet 4 is directly formed and fixed on the bottom when the bottom of the fan frame is formed. This not only simplifies the assembly of the iron sheet, simplifies the production process, and reduces the production cost; it also ensures the integrity and reliability of components such as PCB boards, and ensures the usability and service life of the heat dissipation fan. The present invention sets the interaction between magnetic levitation and magnetic attraction, so that the fan blades can rotate more balanced and stably. The rubber magnet 34 is made by evenly adding magnetic powder to the rubber, and after the jig is pressed into the iron shell, a closed ring rubber is made. After high-voltage magnetization, the magnetic powder will gather in the rubber with N / S polarity, thus forming a fixed annular magnetic field; and the motor coil 2 forms a variable variable magnetic field by changing different winding impedance methods; thus, the fixed annular magnetic field covers the variable magnetic field, forming a magnetic levitation effect of attraction and repulsion, and improving the running performance of the fan blades.

[0028] See also Figure 1 , 2 As shown, in this embodiment, the iron sheet 4 is fixed on the bottom 11 of the fan frame 1 in a semi-enclosed manner and partially exposed on the inner side of the bottom 11. Of course, the outer side of the bottom 11 can also be exposed. As shown in the figure, in order to increase the fixing performance, the iron sheet 4 is also provided with a bending portion 41 folded into the bottom 11 to achieve a gripping effect and increase the injection molding contact surface and depth. Of course, it can also be as Figure 3As shown, the iron sheet 4 is fully embedded in the bottom 11 of the fan frame 1. The specific method is selected according to actual needs, so as to increase the distance and strength of magnetic attraction, improve the magnetic attraction effect, and coordinate with the assembly size of the motor coil and the rubber magnet to generate an upward magnetic levitation force on the motor coil when the fan blade is running. When these two magnetic levitation and magnetic attraction forces reach a balanced boundary point, the fan blade can be placed in a suspended magnetic field. The structure of this magnetic field will greatly reduce the friction between the shaft core and the bearing, thereby reducing the noise of the fan and extending the working life of the fan.

[0029] See also Figure 1 , 2 As shown in Figure 3, in this embodiment, a magnet 5 is also provided on the bottom 11 of the fan frame 1. The magnet 5 is misaligned with the iron sheet 4, and the magnet 5 is coaxially arranged with the shaft core 33 of the blade 3, and the magnet 5 magnetically attracts the blade 3. The magnet 5 increases the magnetic attraction on the blade, especially for high-speed fans that produce products with greater magnetic levitation, which can ensure that the blades rotate in a balanced and stable manner. In this embodiment, the iron sheet 4 is annular, and the magnet 5 is located exactly in the inner ring area of ​​the iron sheet 4. The outer diameter of the magnet 5 is greater than the diameter of the shaft core 33. The shaft core 33 is preferably made of metal material to obtain a better magnetic attraction effect. The iron sheet and magnet at the bottom of the fan frame form a fixed magnetic attraction part relative to the rubber magnet and shaft core of the blade, so that the blade is placed in a two-way action of upward magnetic levitation and downward magnetic attraction. When this magnetic force just reaches a balanced force, the blade is completely placed in a magnetic suspension magnetic field.

[0030] See also Figure 1 , 2 As shown in Figure 3, in this embodiment, the shaft core 33 of the fan blade 3 is assembled into the shaft hole 131 provided in advance by the central shaft 13 through the hydraulic oil-containing bearing 6. A clamping ring 91 is added to one end of the hydraulic oil-containing bearing 6 to clamp the shaft core 33, and an oil return wheel 92 is arranged at the other end of the hydraulic oil-containing bearing 6. This structure ensures the combination of the shaft core 33 and the hydraulic oil-containing bearing 6 and can ensure the service life. The inner bottom of the shaft hole 131 is provided with a wear-resistant gasket 7, and the wear-resistant gasket 7 is used for the insertion end of the shaft core 33 to abut. The wear-resistant gasket 7 is made of high hardness and high wear resistance materials such as alloy steel and ceramics. By adopting the latest technology of hydraulic oil-containing bearings, this bearing adopts the copper metallurgy process imported from Japan, and the copper content is more than 90%, which makes its material closer to the wear resistance and hardness of all copper materials, and is matched with the latest nano-graphene grease, which greatly improves the high temperature resistance and oxidation resistance of the lubricating oil; it helps to improve the working life and quiet performance of the cooling fan.

[0031] The present invention realizes the magnetic attraction effect through the cooperation of the rubber magnet and the iron sheet, and the iron sheet is directly formed and fixed on the bottom when the bottom of the fan frame is formed, which not only simplifies the assembly of the iron sheet, simplifies the production process, and reduces the production cost; at the same time, it also ensures the integrity and reliability of components such as the PCB board, and ensures the usability and service life of the cooling fan. Furthermore, the iron sheet is fixed by injection molding, and the distance and strength of the magnetic attraction can be arbitrarily set according to needs to improve the magnetic attraction effect; at the same time, by setting the assembly size of the motor coil and the rubber magnet, an upward magnetic levitation force can be generated on the motor coil when the fan blade is running. When these two magnetic levitation and magnetic attraction forces reach a balanced boundary point, the fan blade can be placed in a suspended magnetic field to achieve the magnetic levitation effect. The structure of this magnetic field will greatly reduce the friction between the shaft core and the bearing, thereby reducing the noise of the fan and extending the working life of the fan.

[0032] Of course, the above detailed description of the present invention in combination with the implementation method is only for illustrating the technical concept and features of the present invention, and its purpose is to allow people familiar with this technology to understand the content of the present invention and implement it. Therefore, all equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A cooling fan with a magnetic suspension structure, characterized in that: have: A fan frame (1), the fan frame (1) being a plastic part, the fan frame (1) being provided with a bottom (11) and a peripheral wall portion (12) surrounding the bottom (11), the inner center of the bottom (11) protruding upward to form a central axis (13); A motor coil (2), the motor coil (2) being fixed to the outer periphery of the central shaft (13) and being conductively connected to the PCB board (8); The fan blade (3) comprises a hub portion (31) and blades (32) extending radially outward from the hub portion (31), and the hub portion (31) is provided with an axis core (33) and a rubber magnet (34); the fan blade (3) is assembled on the fan frame (1), the axis core (33) is aligned and assembled into an axis hole (131) provided in advance on the central axis (13), and the rubber magnet (34) surrounds the periphery of the motor coil (2); An iron sheet (4), the iron sheet (4) being fixed to the bottom (11) of the fan frame (1) by injection molding, and satisfying that the positive projection of the rubber magnet (34) falls on the iron sheet (4); The rubber magnet (34), the motor coil (2) and the iron sheet (4) interact with each other to create a working environment of magnetic levitation and magnetic attraction, and the fan blade (3) rotates and operates in the working environment; The iron sheet (4) is fully embedded in the bottom (11) of the fan frame (1), and the shaft core (33) of the fan blade (3) is assembled into a pre-provided shaft hole (131) of the central shaft (13) through a hydraulic oil-containing bearing (6).

2. The heat dissipation fan with a magnetic suspension structure according to claim 1, characterized in that: A magnet (5) is also provided on the bottom (11) of the fan frame (1). The magnet (5) is offset from the iron sheet (4), and the magnet (5) is coaxially arranged with the shaft core (33) of the fan blade (3). The magnet (5) magnetically attracts the shaft core (33) of the fan blade.

3. The heat dissipation fan with a magnetic suspension structure according to claim 2, characterized in that: The iron sheet (4) is in the shape of a ring, the magnet (5) is located exactly in the inner ring region of the iron sheet (4), and the outer diameter of the magnet (5) is greater than the diameter of the shaft core (33).

4. The heat dissipation fan with a magnetic suspension structure according to claim 1, characterized in that: The inner bottom of the shaft hole (131) is provided with a wear-resistant gasket (7), against which the insertion end of the shaft core (33) abuts.

5. The heat dissipation fan with a magnetic suspension structure according to claim 1, characterized in that: The rubber magnet (34) is made by uniformly adding magnetic powder into rubber, and after the jig is pressed into the iron shell, a closed annular rubber is formed. After high-voltage magnetization, the magnetic powder will gather in the rubber with N / S polarity, thus forming a fixed annular magnetic field; and the motor coil (2) forms a variable variable magnetic field by changing different winding impedance methods; thus, the fixed annular magnetic field covers the variable magnetic field, forming a magnetic levitation effect of attraction and repulsion.

Images