Magnetic repulsive force transmission miniature fan with supporting device

Abstract

The utility model discloses a magnetic repulsive force transmission miniature fan with a supporting device. The magnetic repulsive force transmission miniature fan comprises an outer frame, two motors and two impellers with a plurality of blades. The two motors are arranged in the outer frame side by side, the two impellers are correspondingly arranged on rotating shafts of the two motors and meshed with each other, and repellent magnets are arranged on the outer sides of the two impellers. And a supporting device is arranged on the impeller. The Roots blower is reasonable in structural design, the repelling magnets with the same magnetic poles are arranged on the outer sides of the two impellers, the two impellers are kept in a non-contact state during rotation according to the principle that the same poles repel, 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, and the service life of the Roots blower is prolonged. The compactness and miniaturization of the equipment are facilitated; and meanwhile, the supporting devices on the impellers are used for axial supporting, so that the impellers are more stable during rotation, meanwhile, the one-way pressure of the two impellers on the axis due to magnetic repulsive force is reduced, and the service life is long.

Description

Technical Field

[0001] The utility model relates to the technical field of micro fans, in particular to a magnetic repulsion transmission micro fan with a supporting device. Background Art

[0002] Roots blower uses two impellers to make relative motion in the cylinder to compress and transport gas, and can provide stable and continuous airflow. For example, the utility model patent with publication number "CN220168150U" and the name "Large Air Volume Roots Blower" discloses a large air volume Roots blower, including a main housing and an oil replenishing mechanism; an air inlet pipe is provided at the air inlet at the upper end of the main housing, and an air outlet pipe is provided at the air outlet at the right end of the main housing. The front and rear inner walls of the main housing are respectively connected to the impellers through the rotating shaft. The two impellers are installed in coordination, and the front end of the rotating shaft in the middle of the impeller is provided with a gear. The two gears are meshed and connected, that is, the two impellers are synchronized through a pair of gears, resulting in a 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 laptops. Utility Model Content

[0003] In view of the above-mentioned shortcomings, the purpose of the utility model is to provide a magnetic repulsion transmission micro fan with a supporting device which has a reasonable structural design and a compact size.

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

[0005] A magnetic repulsion transmission micro fan with a support device, comprising an outer frame, two motors and two impellers with multiple blades; the two motors are arranged side by side in the outer frame, the two impellers are correspondingly arranged on the rotating shafts of the two motors and mesh with each other, and the outer sides of the two impellers are provided with repelling magnets with the same magnetic poles, and the principle of like poles repel each other is used to ensure that the two impellers maintain a non-contact state when rotating, effectively reducing the wear between the impellers and prolonging the service life of the fan. The impeller is provided with a support device that limits its axial movement. The support device makes the impeller rotate more smoothly, and the support device also reduces the unidirectional pressure of the two impellers on the axis due to magnetic repulsion, thereby prolonging the service life.

[0006] As a preferred solution of the utility model, the outer frame includes 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 to the impeller cavity, and the structural design is simple and reasonable.

[0007] As a preferred solution of the utility model, the supporting device is a rolling body, and the rolling body can be a ball, a needle or a roller. The upper and lower surfaces of the impeller are provided with grooves adapted to the rolling body. The rolling body is in contact with the base and the upper cover to achieve axial limiting, effectively improving the stability of rotation.

[0008] As a preferred solution of the utility model, 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, 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.

[0009] As a preferred solution of the utility model, the number of slots 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 output efficiency and stability.

[0010] As a preferred solution of the utility model, the repelling magnets are integral magnetic rings or spliced ​​magnetic rings to meet different assembly requirements.

[0011] As a preferred solution of the utility model, the number of blades of the impeller is n, and n is an even number ≥ 4. When rotating at high speed, the load can be distributed relatively evenly, reducing the impact of asymmetric factors on the operation of the rotor and improving the running stability of the fan.

[0012] As a preferred solution of the utility model, two motors drive the impellers in a time-sharing manner, so that the two impellers interact as active impellers within different angle ranges, effectively reducing the overall power consumption of the fan.

[0013] The beneficial effects of the utility model are as follows: the utility model has a reasonable structural design, and by arranging repelling magnets with the same magnetic poles on the outer sides of the two impellers, the principle of like poles repelling each other is utilized to ensure that the two impellers remain in a non-contact state when rotating, eliminating the synchronous gear structure of the traditional Roots blower, greatly reducing the axial length, reducing the volume, reducing the occupied space, and being conducive to the compactness and miniaturization of the equipment; at the same time, axial support is provided by the supporting device on the impeller, so that the impeller rotates more smoothly, and at the same time, the unidirectional pressure of the two impellers on the axis due to the magnetic repulsion is reduced, thereby extending the service life.

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0016] Figure 2 This is a schematic diagram of the decomposition structure of the utility model Figure 1 .

[0017] Figure 3This is a schematic diagram of the decomposition structure of the utility model Figure 2 .

[0018] Figure 4 It is a schematic diagram of the magnetizing direction of the impeller in the utility model.

[0019] Figure 5 It is a mechanical cycle schematic diagram in the utility model. DETAILED DESCRIPTION

[0020] For example, see Figures 1 to 3 , this embodiment provides a magnetic repulsion transmission micro fan with a supporting device, which includes an outer frame 1, two motors 2 and two impellers 3 with multiple blades; the impeller 3 is made of magnetic conductive material. The number of blades of the impeller 3 is n, and n is preferably an even number ≥4, which can distribute the load relatively evenly, reduce the impact of asymmetric factors on the operation of the rotor, and improve the running stability of the fan. In this embodiment, the impeller 3 with four blades is used as an example for explanation. In other embodiments, the number of blades of the impeller 3 can also be six, eight, ten, etc.

[0021] Two motors 2 are arranged side by side in the outer frame 1. Specifically, the outer frame 1 includes a base 11 and an upper cover 12 covering the base 11. The base 11 is provided with an impeller cavity 13 and an air inlet 14 and an air outlet 15 respectively connected to the impeller cavity 13. The upper cover 12 is fixed to the base 11 by screws to encapsulate the impeller cavity 13.

[0022] The motor 2 includes a driving magnetic tile 21, a stator assembly 22, an axis 23, a bearing 24 and a bearing seat 25. The stator assembly 22 is arranged on the base 11. A PCBA board 6 is arranged on the outer bottom surface of the base 11 and connected to the stator assembly 22. The number of slots 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 the rotation process, further improving the wind 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, the center position of the impeller 3 is provided with a machine cavity matching the outer dimensions of the stator assembly 22, the driving magnetic tile 21 is arranged on the inner side wall of the machine cavity, the axis 23 is arranged on the bearing 24, and one end is fixed at the center position of the machine cavity, so that the two impellers 3 are arranged on the two motors 2 correspondingly, and the blades on the two impellers 3 are meshed with each other. The outer sides of the two impellers 3 are provided with magnets 4 with the same magnetic poles that repel each other, that is, the outer sides of the two impellers 3 have the same magnetic poles, and the principle of like poles repel each other is used to ensure that the two impellers 3 remain in a non-contact state when rotating, and the wear caused by the synchronization of the impellers 3 is minimized, effectively reducing the wear between the impellers 3 and prolonging the service life of the fan. Figure 4 The repelling magnet 4 may be an integral magnetic ring or a spliced ​​magnetic ring. The integral magnetic ring may be an injection-molded magnet, while the spliced ​​magnetic ring may be spliced ​​with MQ magnetic tiles.

[0023] The impeller 3 is provided with a support device 5 that limits its axial movement. The support device 5 makes the impeller 3 rotate more smoothly, and the support device 5 also reduces the unidirectional pressure of the two impellers 3 on the axis 23 due to the magnetic repulsion, thereby extending the service life. In this embodiment, the support device 5 is a rolling body, and the rolling body can be a ball, a needle or a roller. Grooves 51 that are compatible with the rolling body are provided on the upper and lower surfaces of the impeller 3. The rolling body is in contact with the base 11 and the upper cover 12 to achieve axial limitation and effectively improve the stability of rotation. Preferably, the two rolling bodies are a group, and are symmetrically arranged on the upper and lower surfaces of the impeller 3 in a circle center, so that the support effect is better. In other embodiments, other methods can also be used for layout. In addition, the support device 5 can also be a ball screw, and the impeller 3 is provided with a screw hole that is compatible with the ball screw. The ball screw is composed of a spring, a steel ball and a shell. The elastic force of the spring makes the steel ball have a certain rebound effect, which can effectively absorb the axial vibration produced during the rotation process, further improve the operation stability and high reliability. Of course, the support device 5 can also be other structures as long as it can achieve the axial support effect.

[0024] When working, the magnetic repulsion of the repelling magnets 4 maintains the non-contact synchronous rotation state of the two impellers 3, and the shaft 23 and bearing 24 of the motor 2 realize radial support and axial support, and the support device 5 is used for axial support, so that the impeller 3 rotates more smoothly, and at the same time reduces the unidirectional pressure of the two impellers 3 on the shaft 23 due to the magnetic repulsion, and prolongs the service life. When driving, it is preferred to drive the impeller 3 in time-sharing, and control the magnetic field transformation of the stator assemblies 22 of the two motors 2 through the IC on the PCBA board 6, so that the two impellers interact as active impellers in different angle ranges, effectively reducing the overall power consumption of the fan.

[0025] In a mechanical cycle, see Figure 5 Due to the use of magnetic repulsion synchronization, the same impeller is sometimes an active impeller and sometimes a driven impeller in a driving mechanical cycle. If a black impeller is used to represent an active impeller, it is an active rotation; if a white impeller is used to represent a driven impeller, it is a driven rotation.

[0026] For example, in Step 1, when the angle is between 0° and 45°, the impeller on the left side rotates actively, and the blades of the impeller on the left side are close to the blades of the impeller on the right side, achieving effective synchronous drive rotation through magnetic repulsion.

[0027] In Step 2: At an angle of 45° to 90°, the impeller on the right side actively rotates, and the blades of the impeller on the right side are close to the blades of the impeller on the left side, achieving effective synchronous drive rotation through magnetic repulsion.

[0028] By analogy, Step 3-8 is completed, that is, a mechanical cycle is completed, which can ensure that the gas is compressed and transported continuously and evenly, achieving continuous blowing and good heat dissipation effect.

[0029] According to the disclosure and teaching of the above specification, technicians in the field to which the utility model belongs can also change and modify the above implementation. Therefore, the utility model is not limited to the specific implementation methods disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation to the utility model. As described in the above embodiments of the utility model, other fans obtained by using the same or similar structure are all within the scope of protection of the utility model.

Claims

1. A magnetic repulsion transmission micro fan with a supporting device, comprising an outer frame, characterized in that: It also includes two motors and two impellers with multiple blades; the two motors are arranged side by side in the outer frame, the two impellers are correspondingly arranged on the rotating shafts of the two motors and mesh with each other, the outer sides of the two impellers are provided with repelling magnets with the same magnetic poles, and the impellers are provided with a supporting device to limit their axial movement.

2. The magnetic repulsion transmission micro fan with a supporting device according to claim 1, characterized in that: The outer frame 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.

3. The magnetic repulsion transmission micro fan with a supporting device according to claim 1, characterized in that: The supporting device is a rolling body, and the upper and lower surfaces of the impeller are provided with grooves matched with the rolling body.

4. The magnetic repulsion transmission micro fan with a supporting device according to claim 3, characterized in that: The rolling element is a ball, a needle or a roller.

5. The magnetic repulsion transmission micro fan with a supporting device according to claim 2, 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.

6. The magnetic repulsion transmission micro fan with a supporting device according to claim 5, characterized in that: The number of slots of the stator assembly is the same as the number of blades of the impeller.

7. The magnetic repulsion transmission micro fan with a supporting device according to any one of claims 1 to 6, characterized in that: The repelling magnets are integral magnetic rings or spliced ​​magnetic rings.

8. The magnetic repulsion transmission micro fan with a supporting device according to any one of claims 1 to 6, characterized in that: The number of blades of the impeller is n, where n is an even number ≥4.

9. The magnetic repulsion transmission micro fan with a supporting device according to any one of claims 1 to 6, characterized in that: Two motors drive the impeller in a time-sharing manner.

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