Magnetic repulsive force transmission miniature fan

Abstract

The utility model discloses a magnetic repulsive force transmission miniature fan which comprises a shell, two motors and two impellers with a plurality of blades. The two motors are arranged in the shell side by side, the two impellers are correspondingly arranged on rotating shafts of the two motors and meshed with each other, and synchronous magnets with the same magnetic poles are arranged on the outer sides of the two impellers. The impeller is reasonable in structural design, the synchronous magnets with the same magnetic poles are arranged on the outer sides of the two impellers, namely, the magnetic poles on the outer sides of the two impellers are the same, the two impellers are kept in a non-contact state during rotation through magnetic repulsive force according to the principle that like poles repel, abrasion caused by impeller synchronization is reduced to the minimum, abrasion between the impellers is effectively reduced, and the service life of the impeller is prolonged. The service life of the fan is prolonged; meanwhile, a synchronous gear structure of a traditional Roots blower is omitted, the axial length is greatly reduced, the size is reduced, the occupied space is reduced, compactness and miniaturization of equipment are facilitated, and the structure is particularly suitable for heat dissipation of small equipment such as a notebook computer.

Description

Technical Field

[0001] The utility model relates to the technical field of micro fans, and particularly relates to a magnetic repulsion drive micro fan. Background Art

[0002] Roots blowers use two impellers to move relative to each other in a cylinder to compress and transport gas, and can provide stable and continuous air flow. For example, the utility model patent with the publication number "CN220168150U" and the name "Large-volume Roots Blower" discloses a large-volume Roots blower, which includes a main housing and an oil replenishing mechanism; an air inlet pipe is provided at the air inlet of the upper end of the main housing, and an air outlet pipe is provided at the air outlet of the right end of the main housing. The front and rear inner walls of the main housing are respectively rotatably connected with impellers through rotating shafts, and the two impellers are cooperatively installed. Gears are provided at the front ends of the rotating shafts in the middle of the two impellers, and the two gears are meshed and connected. That is, the two impellers are synchronized through a pair of gears, resulting in a relatively long overall axial dimension, which is not conducive to the compactness and miniaturization of the equipment, and is not suitable for the heat dissipation of some small devices such as notebook computers. Content of the Utility Model

[0003] Aiming at the above deficiencies, the purpose of the utility model is to provide a magnetic repulsion drive micro fan with a reasonable structural design and a small size.

[0004] To achieve the above purpose, the technical solution provided by the utility model is:

[0005] A magnetic repulsion drive micro fan includes a housing, two motors, and two impellers with multiple blades; the two motors are arranged side by side in the housing, the two impellers are correspondingly arranged on the rotating shafts of the two motors and are meshed with each other, and synchronous magnets with the same magnetic poles are arranged outside the two impellers. Using the principle of like poles repelling each other, it is ensured that the two impellers maintain a non-contact state during rotation, effectively reducing the wear between the impellers and improving the service life of the fan.

[0006] As a preferred solution of the utility model, the two motors drive the impellers at different times, so that the two impellers alternately act as the driving impellers in different angular ranges, effectively reducing the overall power consumption of the fan.

[0007] As a preferred solution of the utility model, the housing includes a base and an upper cover covering the base. The base is provided with an impeller cavity, an air inlet and an air outlet respectively communicated with the impeller cavity, and the structural design is simple and reasonable.

[0008] As a preferred embodiment of the present utility model, the motor includes a driving magnetic tile, a stator assembly, a shaft center, a bearing and a bearing seat. The stator assembly is disposed on the base. The bearing seat is fixed to the base corresponding to the central position of the stator assembly. The bearing is disposed on the bearing seat. A machine cavity matching the external dimension of the stator assembly is provided at the central position of the impeller. The driving magnetic tile is disposed on the inner side wall of the machine cavity. The shaft center is disposed on the bearing and one end thereof is fixed at the center position of the machine cavity.

[0009] As a preferred embodiment of the present utility model, the number of stator teeth of the stator assembly is the same as the number of blades of the impeller, so that each blade can obtain the most effective magnetic drive during rotation, further improving the wind power output efficiency and stability.

[0010] As a preferred embodiment of the present utility model, the synchronous magnet is an integral magnetic ring or a spliced magnetic ring to meet different assembly requirements.

[0011] As a preferred embodiment of the present utility model, the number of blades of the impeller is n, and n is an even number greater than or equal to 4. During high-speed rotation, the load can be relatively evenly distributed, reducing the influence of asymmetric factors on the operation of the rotor and improving the operation stability of the fan.

[0012] The beneficial effects of the present utility model are as follows: The structure of the present utility model is reasonably designed. Synchronous magnets with the same magnetic poles are provided on the outer sides of the two impellers, that is, the magnetic poles on the outer sides of the two impellers are the same. Using the principle of like poles repelling each other, the two impellers are kept in a non-contact state during rotation through magnetic repulsion force, minimizing the wear caused by impeller synchronization, effectively reducing the wear between the impellers, and improving the service life of the fan. At the same time, the synchronous gear structure of the traditional Roots blower is also omitted, greatly reducing the axial length, shrinking the volume, reducing the occupied space, facilitating the compactness and miniaturization of the equipment, and being particularly suitable for the heat dissipation of some small devices such as laptop computers.

[0013] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments. Description of the Drawings

[0014] Figure 1 is a three-dimensional structural schematic diagram of the present utility model.

[0015] Figure 2 is an exploded structural schematic Figure 1 .

[0016] Figure 3 is an exploded structural schematic Figure 2 .

[0017] Figure 4 is an exploded structural schematic Figure 3。

[0018] Figure 5 It is a schematic diagram of the magnetization direction of the impeller in the present utility model.

[0019] Figure 6 It is a schematic diagram of a mechanical cycle in the present utility model.

[0020] Figure 7 It is a schematic diagram of the structure of another embodiment of the present utility model. Specific implementation mode

[0021] Example 1, see Figures 1 to 6 A magnetic repulsion drive micro fan provided in this embodiment includes a housing 1, two motors 2 and two impellers 3 with multiple blades; the impeller 3 is made of a metal material. The number of blades of the impeller 3 is n, and the n is preferably an even number ≥ 4, which can distribute the load relatively evenly, reduce the influence of asymmetric factors on the operation of the rotor, and improve the operation stability of the fan. In this embodiment, the case where the impeller 3 has four blades is taken as an example for description.

[0022] The two motors 2 are arranged side by side in the housing 1. Specifically, the housing 1 includes a base 11 and an upper cover 12 covering the base 11. An impeller cavity 13, an air inlet 14 and an air outlet 15 communicating with the impeller cavity 13 are provided on the base 11.

[0023] The motor 2 includes a driving magnetic tile 21, a stator assembly 22, a shaft center 23, bearings 24 and a bearing seat 25. The stator assembly 22 is arranged on the base 11. A PCBA board 4 is provided on the outer bottom surface of the base 11 and is connected to the stator assembly 22. The number of stator teeth of the stator assembly 22 is preferably the same as the number of blades of the impeller 3, so that each blade can obtain the most effective magnetic drive during rotation, further improving the wind power output efficiency and stability. The bearing seat 25 is fixed on the base 11 corresponding to the center position of the stator assembly 22. The bearing 24 is arranged on the bearing seat 25. A machine cavity matching the outer dimension of the stator assembly 22 is provided at the center position of the impeller 3. The driving magnetic tile 21 is arranged on the inner side wall of the machine cavity. The shaft center 23 is arranged on the bearing 24 and one end is fixed at the center position of the machine cavity, so as to realize the corresponding arrangement of the two impellers 3 on the two motors 2, and the blades on the two impellers 3 are meshed with each other. Synchronous magnets 5 with the same magnetic poles are arranged outside the two impellers 3, that is, the magnetic poles outside the two impellers 3 are the same. Using the principle of like poles repelling each other, it is ensured that the two impellers 3 keep a non-contact state during rotation, reducing the wear caused by impeller 3 synchronization to the lowest level, effectively reducing the wear between the impellers 3, and improving the service life of the fan. For the magnetization direction of the two impellers 3, see Figure 5, the magnetization method is unipolar normal magnetization. The synchronous magnet 5 can be a spliced magnetic ring, such as being spliced by MQ magnetic tiles. The synchronous magnets 5 on the two impellers 3 can both be N poles or S poles.

[0024] During operation, the radial support and axial support are realized by the shaft center 23 and bearing 24 of the motor 2, and the non-contact synchronous rotation state of the two impellers 3 is maintained by the magnetic repulsive force of the synchronous magnet 5. When driving, it is preferably to drive the impellers in a time-sharing manner. The magnetic field transformation of the stator assemblies 22 of the two motors 2 is controlled by the IC on the PCBA board 4, so that the two impellers alternately act as the driving impeller in different angular ranges, effectively reducing the overall power consumption of the fan.

[0025] In one mechanical cycle, refer to Figure 6 , due to the adoption of magnetic repulsive force synchronization, in one driving mechanical cycle, the same impeller is sometimes the driving impeller and sometimes the driven impeller. For example, if the black impeller is used to represent the driving impeller, it rotates actively; if the white impeller is used to represent the driven impeller, it rotates passively.

[0026] Such as Step1: When the angle is from 0° to 45°, the impeller on the left side rotates actively, and the blades of the impeller on the left side will be close to the blades of the impeller on the right side, and effective synchronous driving rotation is achieved through magnetic repulsive force.

[0027] In Step2: When the angle is from 45° to 90°, the impeller on the right side rotates actively, and the blades of the impeller on the right side will be close to the blades of the impeller on the left side, and effective synchronous driving rotation is achieved through magnetic repulsive force.

[0028] And so on to complete Step3-8, that is, to complete one mechanical cycle, which can ensure that the gas is continuously and evenly compressed and transported, realizing continuous air blowing and having a good heat dissipation effect.

[0029] Embodiment 2, refer to Figure 7 , a magnetic repulsive force transmission micro fan provided in this embodiment has basically the same structure as that in Embodiment 1. The difference is that the number of blades n of the impeller is six. In other embodiments, the number of blades of the impeller can also be eight, ten, etc. The synchronous magnet 5 is an integral magnetic ring, such as injection molding magnet.

[0030] Based on the disclosure and teachings of the above specification, those skilled in the art to which the present utility model pertains can also make changes and modifications to the above embodiments. Therefore, the present utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present utility model should also fall within the protection scope of the claims of the present utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present utility model. As described in the above embodiments of the present utility model, other fans obtained by adopting the same or similar structures are all within the protection scope of the present utility model.

Claims

1. A magnetic repulsion transmission micro fan, comprising a housing, characterized in that: It also includes two motors and two impellers with multiple blades; the two motors are arranged side by side in the shell, the two impellers are correspondingly arranged on the rotating shafts of the two motors and mesh with each other, and synchronous magnets with the same magnetic poles are arranged on the outer sides of the two impellers.

2. The magnetic repulsion transmission micro fan according to claim 1, characterized in that: Two motors drive the impeller in a time-sharing manner.

3. The magnetic repulsion transmission micro fan according to claim 1, characterized in that: The shell comprises a base and an upper cover covering the base. The base is provided with an impeller cavity and an air inlet and an air outlet respectively connected with the impeller cavity.

4. The magnetic repulsion transmission micro fan according to claim 3, characterized in that: The motor includes a driving magnetic shoe, a stator assembly, an axis, a bearing and a bearing seat. The stator assembly is arranged on the base, and the bearing seat is fixed on the base corresponding to the center position of the stator assembly. The bearing is arranged on the bearing seat. The center position of the impeller is provided with a machine cavity matching the outer dimensions of the stator assembly. The driving magnetic shoe is arranged on the inner side wall of the machine cavity, the axis is arranged on the bearing, and one end is fixed at the center position of the machine cavity.

5. The magnetic repulsion transmission micro fan according to claim 4, characterized in that: The number of stator teeth of the stator assembly is the same as the number of blades of the impeller.

6. The magnetic repulsion transmission micro fan according to any one of claims 1 to 4, characterized in that: The synchronous magnet is an integral magnetic ring or a spliced ​​magnetic ring.

7. The magnetic repulsion transmission micro fan according to any one of claims 1 to 4, characterized in that: The number of blades of the impeller is n, and n is an even number ≥4.

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