Ducted motor noise reduction type rotor structure

Abstract

The utility model relates to the technical field of motors, in particular to a noise reduction type rotor structure of a ducted motor, which comprises a main shaft, a fan blade connected with the main shaft, a limiting block arranged on the main shaft, a bearing propped against the limiting block in a stopping manner, and a spring arranged between the bearing and the fan blade, one end of the spring abuts against the bearing, and the other end of the spring abuts against the fan blade. The bearing is compact in structure and reasonable in design, the elastic force of the spring is utilized to properly press the bearing, and the play clearance is reduced, so that the noise is effectively reduced, the structural stability is improved, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a noise-reducing rotor structure for a ducted motor. Background Technology

[0002] With the continuous advancement of technology and the improvement of people's living standards, ducted motors are widely used in products such as hair dryers, handheld fans, and mini vacuum cleaners. A ducted motor is a type of brushless DC motor, which, compared to traditional brushed motors, has higher efficiency and a longer service life. The rotor of a ducted motor has multiple permanent magnets, and the stator has multiple coils. The current in the coils is controlled by an electronic speed controller (ESC), thereby controlling the speed and direction of the ducted motor. However, existing ducted motors have high rotor energy consumption and are prone to generating significant noise. The main contributing factor is the unstable operation caused by the single-bearing structure, which affects their service life. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of existing technologies by providing a noise-reducing rotor structure for ducted motors. The structure is compact and rationally designed, and the bearings are properly compressed by the elastic force of springs to reduce axial movement and clearance, thereby effectively reducing noise, increasing structural stability, and improving service life.

[0004] To achieve the above objectives, this utility model provides a noise-reducing rotor structure for a ducted motor, comprising a main shaft, a fan blade connected to the main shaft, a limiting block disposed on the main shaft, a bearing that abuts against the limiting block, and a spring disposed between the bearing and the fan blade. The bearing is sleeved on the outside of the main shaft, one end of the spring abuts against the bearing, and the other end of the spring abuts against the fan blade.

[0005] Preferably, the fan blade includes a protruding head, a cylindrical portion disposed within the protruding head, ribs disposed between the cylindrical portion and the protruding head, and blades disposed outside the protruding head. Multiple ribs are provided, and the multiple ribs are arranged circumferentially around the outer wall of the cylindrical portion. The main shaft is connected to the cylindrical portion.

[0006] Preferably, the blade is arc-shaped and extends upward along the arc direction, and multiple blades are provided, which are arranged circumferentially around the outer wall of the protruding head.

[0007] Preferably, the end of the main shaft away from the fan blade is provided with a slot, and the slot is provided with a positioning spring.

[0008] Preferably, the spindle is provided with a magnet, which is sleeved on the outside of the spindle.

[0009] The beneficial effects of this utility model are: compact structure and reasonable design, using the elastic force of the spring to properly compress the bearing, reducing the backlash and thus effectively reducing noise, increasing structural stability and improving service life. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model.

[0011] Figure 2 This is an exploded structural diagram of the present invention.

[0012] Figure 3 This is a schematic diagram of the wind turbine blade structure of this utility model.

[0013] The reference numerals in the figures include:

[0014] 1—Spindle 11—Slot 12—Positioning Spring

[0015] 2—Wind blade 21—Head protrusion 22—Cylinder section

[0016] 23 - Ribs 24 - Leaves

[0017] 3 - Limiting block; 4 - Bearing; 5 - Spring

[0018] 6 - Magnet. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings.

[0020] like Figures 1 to 3 As shown, the present invention discloses a noise-reducing rotor structure for a ducted motor, comprising a main shaft 1, a fan blade 2 connected to the main shaft 1, a limiting block 3 disposed on the main shaft 1, a bearing 4 that abuts against the limiting block 3, and a spring 5 disposed between the bearing 4 and the fan blade 2. The bearing 4 is sleeved on the outside of the main shaft 1, one end of the spring 5 abuts against the bearing 4, and the other end of the spring 5 abuts against the fan blade 2.

[0021] The fan blade 2 is connected to the main shaft 1 and is stopped and pressed between the bearing 4 and the magnet 6 by the limiting block 3, which respectively provides stable positioning and safety protection for the bearing 4 and the magnet 6. Since one end of the spring 5 abuts against the bearing 4 and the other end of the spring 5 abuts against the fan blade 2, the elastic force of the spring 5 appropriately presses the inner ring of the bearing 4, thereby reducing the play and helping to reduce noise and enhance structural stability during the rotation of the fan blade 2. Play, also known as bearing clearance, is the amount of radial or axial movement of one of the inner or outer rings of the bearing 4 relative to the fixed part. When the clearance is too small, it may cause the operating temperature of the bearing 4 to rise, making it unable to work properly, or even causing the rolling elements to seize. When the clearance is too large, it may cause large operating vibration and noise. Therefore, a suitable and elastically adjustable clearance helps the bearing 4 to work properly and reduce noise. This application uses the flexible elastic adjustment force of the spring 5 to ensure that the inner ring of the bearing 4 has a suitable clearance, so as to ensure the normal operation of the bearing 4 and the working stability of the product. This utility model has a compact structure and reasonable design. It uses the elastic force of spring 5 to properly press the bearing 4, reducing the backlash and thus effectively reducing noise, increasing structural stability, and improving service life.

[0022] The fan blade 2 in this embodiment includes a protruding head 21, a cylindrical portion 22 disposed within the protruding head 21, ribs 23 disposed between the cylindrical portion 22 and the protruding head 21, and blades 24 disposed outside the protruding head 21. Multiple ribs 23 are provided, arranged circumferentially around the outer wall of the cylindrical portion 22. The main shaft 1 is connected to the cylindrical portion 22. Specifically, the protruding head 21 has an internally hollow structure, the cylindrical portion 22 is located in the middle of the protruding head 21, the blades 24 are evenly distributed on the outer periphery of the protruding head 21, and multiple ribs 23 are arranged circumferentially around the outer wall of the cylindrical portion 22. Furthermore, the multiple ribs 23 support and hold the protruding head 21 and the cylindrical portion 22, resulting in good structural stability, effectively supporting and fixing the position of the cylindrical portion 22, and improving the reliability of the connection between the main shaft 1 and the cylindrical portion 22.

[0023] In this embodiment, the blades 24 are arc-shaped and extend upward along the arc direction. Multiple blades 24 are arranged circumferentially around the outer wall of the protruding head 21. Specifically, the multiple blades 24 are arranged circumferentially around the outer wall of the protruding head 21, and their arc shape and upward extension along the arc direction allow airflow to enter the guide plate of the casing from the external environment along the arc direction. Because the fan blades 2 and the guide plate are spaced apart and opposite to each other, the input airflow is further guided and converged by the guide plate, significantly accelerating the airflow and generating a strong, high-speed airflow output.

[0024] In this embodiment, a slot 11 is provided at the end of the main shaft 1 away from the fan blade 2, and a positioning spring 12 is provided in the slot 11. Specifically, the slot 11 is provided with a positioning spring 12. The rotor structure can be separately produced from the modular brushless coreless high-speed ducted motor, and then the rotor structure is inserted into the stator structure and assembled into a finished motor. The positioning spring 12 is used to limit the relative position of the rotor structure and the stator structure.

[0025] In this embodiment, the main shaft 1 is equipped with a magnet 6, which is sleeved on the outside of the main shaft 1. Specifically, when the stator winding is energized, a rotating magnetic field is generated. This rotating magnetic field forms an electromagnetic interaction with the magnet 6 sleeved on the outside of the main shaft 1, generating an induced electromotive force and current, thereby forming an electromagnetic torque on the main shaft 1, causing the main shaft 1 to be subjected to force and drive the fan blade 2 to rotate.

[0026] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A noise-reducing rotor structure for a ducted motor, characterized in that: It includes a main shaft, a fan blade connected to the main shaft, a limiting block disposed on the main shaft, a bearing that stops and abuts against the limiting block, and a spring disposed between the bearing and the fan blade. The bearing is sleeved on the outside of the main shaft, one end of the spring abuts against the bearing, and the other end of the spring abuts against the fan blade.

2. The ducted motor noise-reducing rotor structure according to claim 1, characterized in that: The fan blade includes a protruding head, a cylindrical part disposed within the protruding head, ribs disposed between the cylindrical part and the protruding head, and blades disposed outside the protruding head. Multiple ribs are provided, and the multiple ribs are arranged circumferentially around the outer wall of the cylindrical part. The main shaft is connected to the cylindrical part.

3. The ducted motor noise-reducing rotor structure according to claim 2, characterized in that: The blades are arc-shaped and extend upward along the arc direction. There are multiple blades, which are arranged circumferentially around the outer wall of the protruding head.

4. The ducted motor noise-reducing rotor structure according to claim 1, characterized in that: The main shaft is provided with a slot at the end away from the fan blade, and the slot is provided with a positioning spring.

5. The ducted motor noise-reducing rotor structure according to claim 1, characterized in that: The spindle is equipped with a magnet, which is sleeved on the outside of the spindle.

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