CN112761986A

CN112761986A - Heat radiation fan with magnetic suspension structure

Info

Publication number: CN112761986A
Application number: CN202110177934.2A
Authority: CN
Inventors: 吴进平; 胡科祥; 董桂玲; 朱晶
Original assignee: Hong Sheng Electronic Co ltd
Current assignee: Hong Sheng Electronic Co ltd
Priority date: 2021-02-09
Filing date: 2021-02-09
Publication date: 2021-05-07

Abstract

The invention relates to a heat radiation fan with a magnetic suspension structure, wherein a fan frame is a plastic piece, the fan frame is provided with a bottom and a peripheral wall part enclosing the bottom, and the inner center of the bottom protrudes upwards to form a central shaft; the motor coil is fixed on the periphery of the middle shaft and is in conductive connection with the PCB; the fan blade comprises a hub part and blades extending outwards from the hub part in the radial direction, and a shaft core and a rubber magnet are arranged on the hub part; the fan blades are assembled on the fan frame, the shaft core is assembled in a shaft hole provided in advance by the middle shaft in an alignment way, and the glue magnet surrounds the periphery of the motor coil; the iron sheet is fixed on the bottom of the fan frame in an injection molding mode, and the requirement that the orthographic projection of the glue magnet falls on the iron sheet is met; the glue magnet, the motor coil and the iron sheet interact to create a working environment of magnetic suspension and magnetic attraction, and the fan blades rotate and run in the working environment. The invention has simple structure and convenient manufacture and assembly, and the working environment of magnetic suspension and magnetic attraction can greatly reduce the friction between the shaft core and the bearing, thereby reducing the noise of the fan and prolonging the service life of the fan.

Description

Heat radiation fan with magnetic suspension structure

Technical Field

The invention relates to the technical field of cooling fans, in particular to a magnetic suction type cooling fan.

Background

In the prior art, a magnetic element is usually added to attract and pull down the fan blades in order to reduce the axial vibration generated when the fan blades rotate and to make the fan blades rotate stably and balancedly. The fan is inhaled to magnetism on current market, its structure is that to set up an iron sheet on the PCB board, and the line frame of rethread motor removes to block fixedly, and the design of this kind has a lot of drawbacks:

1. the iron sheet is tightly attached to the PCB, so that a large space of the PCB is occupied, electronic elements are forced to avoid and changed into double-sided attaching pieces, and the SMT cost is increased.

2. The iron sheet is required to be reserved with a positioning hole of the wire frame and an induction hole of the fan Hall IC, so that the whole iron sheet is not a complete circle, and the magnetic adsorption force of the iron sheet on the fan blades generates different forces.

3. The production process is complicated when assembling and positioning the iron sheet, the cost is high, and the iron sheet exposed outside is easy to oxidize and has poor reliability.

Disclosure of Invention

In order to overcome the problems and the defects of the magnetic suction fan, the invention improves the structure again and designs the radiating fan with a novel magnetic suspension structure.

In order to achieve the purpose, the invention adopts the following technical scheme:

a heat radiation fan with a magnetic suspension structure comprises:

the fan frame is a plastic part and is provided with a bottom and a peripheral wall part enclosing the bottom, and the inner center of the bottom protrudes upwards to form a central shaft;

the motor coil is fixed on the periphery of the middle shaft and is in conduction connection with the PCB;

the fan blade comprises a hub part and blades extending outwards from the hub part in the radial direction, wherein a shaft core and a rubber magnet are arranged on the hub part; the fan blades are assembled on the fan frame, the shaft core is assembled in a shaft hole provided in advance by the middle shaft in an alignment way, and the glue magnet surrounds the periphery of the motor coil;

the iron sheet is fixed on the bottom of the fan frame in an injection molding mode and meets the requirement that the orthographic projection of the rubber magnet falls on the iron sheet;

the glue magnet, the motor coil and the iron sheet interact to create a working environment of magnetic suspension and magnetic attraction, and the fan blades rotate and run in the working environment.

In the scheme, the iron sheet is fully covered and buried in the bottom of the fan frame.

In the above scheme, the iron sheet is fixed on the bottom of the fan frame in a half-wrapping manner and is partially exposed on the inner side surface or the outer side surface of the bottom.

Above-mentioned scheme is further, still be equipped with magnet on the bottom of fan frame, this magnet and iron sheet dislocation, and magnet and the axle center coaxial arrangement of flabellum, magnet magnetism inhale the flabellum.

The scheme is further that the iron sheet is circular, the magnet is just located 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.

The above scheme is further that the shaft cores of the fan blades are assembled in a shaft hole provided in the middle shaft in advance through a hydraulic oil bearing.

Above-mentioned scheme is further, the inner bottom in shaft hole is equipped with wear-resisting gasket, and wear-resisting gasket supplies the insertion end of axle core to support and leans on.

According to the scheme, further, the rubber magnet is formed by uniformly adding magnetic powder into rubber, pressing a jig into an iron shell to form closed circular rubber, and after high-pressure magnetization, the magnetic powder can form N/S polarity aggregation in the rubber, so that a fixed annular magnetic field is formed; the motor coil forms a variable magnetic field by changing different winding impedance modes; thus, the fixed annular magnetic field covers the variable magnetic field to form attractive and repulsive magnetic levitation.

The magnetic attraction effect is realized by matching the rubber magnet with the iron sheet, and the iron sheet is directly formed and fixed on the bottom when the bottom of the fan frame is formed, so that the assembly of the iron sheet is simplified, the production process is simple, and the manufacturing cost is reduced; meanwhile, the integrity and the reliability of elements such as a PCB (printed Circuit Board) and the like are ensured, and the usability and the service life of the cooling fan are ensured. Furthermore, the iron sheet is fixed by injection molding, the magnetic attraction distance and strength can be set arbitrarily according to requirements, and the magnetic attraction effect is improved; meanwhile, the assembly size of the motor coil and the rubber magnet can be set, so that an upward magnetic levitation force is generated on the motor coil when the fan blade runs, when the two magnetic levitation and magnetic attraction forces reach a balanced boundary point, the fan blade can be arranged in a suspended magnetic field to achieve the magnetic levitation effect, and the structure of the magnetic field can greatly reduce the friction between the shaft core and the bearing, thereby reducing the noise of the fan and prolonging the service life of the fan.

Description of the drawings:

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the assembly of the embodiment of FIG. 1;

FIG. 3 is a schematic sectional view of the assembly structure of two embodiments of the present invention.

The specific implementation mode is as follows:

the conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1, 2 and 3, which are schematic views of a preferred embodiment of the present invention, the present invention relates to a heat dissipation fan with a magnetic suspension structure, which includes a fan frame 1, fan blades 3, a motor coil 2, a PCB 8 and an iron sheet 4. The fan frame 1 is a plastic part and is obtained by integral molding or split molding in assembly, the fan frame 1 is provided with a bottom 11 and a peripheral wall part 12 enclosing the bottom 11, the inner center of the bottom 11 protrudes upwards to form a center shaft 13, and an assembly space is reserved between the outer periphery of the center shaft 13 and the peripheral wall part 12. The motor coil 2 is assembled in the assembling space and fixed on the periphery of the middle shaft 13, and the motor coil 2 is connected with the PCB 8 in a conduction manner to obtain a power supply. In this embodiment, the motor coil 2 and the PCB board 8 are connected to form a whole and then assembled into the fan frame 1. The fan blade 3 comprises a hub part 31 and a blade 32 extending outwards from the hub part 31 in the radial direction, wherein a shaft core 33 and a rubber magnet 34 are arranged on the hub part 31; the fan blade 3 is assembled on the fan frame 1, the shaft core 33 is assembled in the shaft hole 131 provided in the middle shaft 13 in an aligned manner, the glue magnet 34 surrounds the periphery of the motor coil 2, the fan blade 3 is driven to rotate by the motor coil 2, and the specific rotating working principle of the fan blade 3 is the prior art and is not described herein again. This iron sheet 4 is fixed on the bottom 11 of fan frame 1 through ejection moulding mode, and satisfies the orthographic projection of gluing magnetism 34 and falls on iron sheet 4, inhales through the magnetism that produces between iron sheet 4 and the gluing magnetism 34 and reduces the produced axial vibrations when the flabellum rotates, makes the flabellum can rotate in balanced stability, obtains magnetism and inhales formula radiator fan. The iron sheet 4 is directly formed and fixed on the bottom when the bottom of the fan frame is formed, so that the assembly of the iron sheet is simplified, the production process is simple, and the manufacturing cost is reduced; meanwhile, the integrity and the reliability of elements such as a PCB (printed Circuit Board) and the like are ensured, and the usability and the service life of the cooling fan are ensured. The invention sets the interaction of magnetic suspension and magnetic attraction, so that the fan blade can rotate more stably and balancedly. The rubber magnet 34 is a closed circular ring rubber prepared by uniformly adding magnetic powder into rubber and pressing a jig into an iron shell, and the magnetic powder is subjected to N/S polarity aggregation in the rubber after high-pressure magnetization, so that a fixed annular magnetic field is formed; the motor coil 2 forms a variable magnetic field by changing different winding impedance modes; thus, the fixed annular magnetic field covers the variable magnetic field, the attractive and repulsive magnetic levitation effect is formed, and the running performance of the fan blade is improved.

Referring to fig. 1 and 2, in the present embodiment, the iron sheet 4 is fixed on the bottom 11 of the fan frame 1 in a half-wrapping manner and partially exposed on the inner side surface of the bottom 11, and certainly, the outer side surface of the bottom 11 may also be exposed, and as shown in the figure, in order to increase the fixing performance, the iron sheet 4 is further provided with a bending portion 41 folded into the bottom 11, so as to achieve the grasping effect and increase the injection contact surface and depth. Of course, as shown in fig. 3, the iron piece 4 may be buried in the bottom 11 of the fan frame 1 in a fully-covered manner. The specific mode is selected according to actual need, thereby distance and intensity that can inhale magnetically, promote the effect of inhaling magnetically, and the cooperation is set for motor coil and gluey magnetic assembly size, produce an ascending magnetic suspension dynamics to motor coil when making the flabellum move, when these two kinds of magnetic suspensions and inhale the dynamics and reach a balanced boundary point, the flabellum just can be arranged in a unsettled magnetic field, the structure of this kind of magnetic field can the greatly reduced axle core and the friction of bearing, thereby reduce the noise of fan, the life of extension fan.

Referring to fig. 1, 2 and 3, in the embodiment, the bottom 11 of the fan frame 1 is further provided with a magnet 5, the magnet 5 is dislocated from the iron sheet 4, the magnet 5 is coaxially arranged with the axial core 33 of the fan blade 3, and the magnet 5 magnetically attracts the fan blade 3. The magnet 5 increases the magnetic attraction effect on the fan blades, and particularly can ensure that the fan blades rotate stably in a balanced manner for a product with large magnetic levitation generated by a high-speed rotating fan. In this embodiment, iron sheet 4 is the ring shape, and magnet 5 is located the inner ring region of iron sheet 4 just, and magnet 5's external diameter is greater than the diameter of axle core 33, and the preferred metal material preparation of axle core 33 obtains more magnetic attraction effect. The iron sheet and the magnet at the bottom of the fan frame form a fixed magnetic attraction piece relative to the glue magnetism and the shaft core of the fan blade, so that the fan blade is arranged in an upward magnetic suspension and a downward magnetic attraction double-way action, and the fan blade is completely arranged in a magnetic suspension magnetic field when the magnetic action just reaches a balanced force.

Referring to fig. 1, 2 and 3, in this embodiment, the shaft core 33 of the fan blade 3 is assembled into a shaft hole 131 provided in advance in the middle shaft 13 through the hydraulic oil-retaining bearing 6, a snap ring 91 is added at one end of the hydraulic oil-retaining bearing 6 to be clamped with the shaft core 33, and the oil returning wheel 92 is assembled at the other end of the hydraulic oil-retaining bearing 6, so that the structure ensures the combination of the shaft core 33 and the hydraulic oil-retaining bearing 6, and can ensure the service life. The inner bottom of the shaft hole 131 is provided with a wear-resistant gasket 7, the wear-resistant gasket 7 is used for the insertion end of the shaft core 33 to abut against, and the wear-resistant gasket 7 is made of high-hardness and high-wear-resistance materials such as alloy steel and ceramic. By adopting the hydraulic oil-retaining bearing with the latest technology, the bearing adopts a Japanese imported copper metallurgy process, the copper has the content of more than 90 percent, the material of the bearing is closer to the wear-resistant hardness of an all-copper material, and the latest nano-scale graphene grease is matched, so that the high temperature resistance and the oxidation resistance of the lubricating oil are greatly improved; the working life and the mute performance of the radiating fan are favorably improved.

It is to be understood that the foregoing detailed description of the present invention has been provided only for the purpose of illustrating the technical spirit and features of the present invention, and the present invention is not limited thereto.

Claims

1. A heat radiation fan with a magnetic suspension structure is characterized by comprising:

the fan frame (1), the fan frame (1) is a plastic part, the fan frame (1) is provided with a bottom (11) and a peripheral wall part (12) enclosing the bottom (11), and the inner center of the bottom (11) protrudes upwards to form a central shaft (13);

the motor coil (2), the motor coil (2) is fixed on the periphery of the middle shaft (13) and is connected with the PCB (8) in a conduction way;

the fan blade (3) comprises a hub part (31) and blades (32) extending outwards from the hub part (31) in the radial direction, wherein a shaft core (33) and a rubber magnet (34) are arranged on the hub part (31); the fan blade (3) is assembled on the fan frame (1), the shaft core (33) is assembled in a shaft hole (131) provided in advance by the middle shaft (13) in an alignment way, and the rubber magnet (34) surrounds the periphery of the motor coil (2);

the iron sheet (4) is fixed on the bottom (11) of the fan frame (1) in an injection molding mode, and the orthographic projection of the glue magnet (34) falls on the iron sheet (4);

glue magnetism (34), motor coil (2) and iron sheet (4) and build the operational environment of magnetism suspension and magnetism after the interact, flabellum (3) rotate the operation in this operational environment.

2. The heat-dissipating fan of magnetic suspension structure as claimed in claim 1, wherein the iron sheet (4) is buried in the bottom (11) of the fan frame (1) in a fully-covered manner.

3. The heat dissipation fan of a magnetic suspension structure as claimed in claim 1, wherein the iron sheet (4) is half-wrapped and fixed on the bottom (11) of the fan frame (1) and partially exposed on the inner side or outer side of the bottom (11).

4. The heat dissipation fan with magnetic suspension structure as claimed in claim 1, wherein the bottom (11) of the fan frame (1) is further provided with a magnet (5), the magnet (5) is offset from the iron sheet (4), the magnet (5) is coaxially arranged with the axial core (33) of the fan blade (3), and the magnet (5) magnetically attracts the axial core (33) of the fan blade.

5. The heat-dissipating fan of magnetic suspension structure as claimed in claim 4, wherein the iron plate (4) is circular ring-shaped, the magnet (5) is located just in the inner ring area of the iron plate (4), and the outer diameter of the magnet (5) is larger than the diameter of the shaft core (33).

6. The heat-dissipating fan of a magnetic levitation structure as recited in claim 1 or 4, wherein the shaft core (33) of the fan blade (3) is assembled into a shaft hole (131) provided in advance of the center shaft (13) through a hydraulic oil bearing (6).

7. The heat-dissipating fan of magnetic suspension structure as claimed in claim 6, wherein the inner bottom of the shaft hole (131) is provided with a wear-resistant pad (7), the wear-resistant pad (7) is abutted by the insertion end of the shaft core (33).

8. The heat dissipation fan with magnetic suspension structure as claimed in claim 1, wherein the rubber magnet (34) is made into a closed ring rubber by uniformly adding magnetic powder into rubber, pressing the jig into an iron shell, and after high-pressure magnetization, the magnetic powder will become N/S polarity aggregation in the rubber, thus forming a fixed ring magnetic field; the motor coil (2) forms a variable magnetic field by changing different winding impedance modes; thus, the fixed annular magnetic field covers the variable magnetic field to form attractive and repulsive magnetic levitation.