Miniature high-speed fan

Abstract

The utility model discloses a miniature high-speed fan. Comprising a shell, an impeller, a stator and a rotor, a through cavity is formed in the shell, a frame is arranged in the through cavity of the shell, the stator is fixedly installed in the frame, a through opening is formed in one end of the frame, a rear cover is arranged at the other end of the frame, and bearing installation grooves are formed in the through opening and the rear cover; the bearings of the shaft rods at the two ends of the rotor are installed in the bearing installation grooves respectively, at least one shaft rod of the rotor is provided with a pre-pressed spring, one end of the spring abuts against the bearings, and the impeller is arranged at the symmetrical end of the rear cover and connected with the shaft rods of the rotor. According to the utility model, the spring is arranged at the shaft rod of the rotor and the bearings, so that the bearings at the two ends are subjected to outward pushing force, and the pre-tightening force is provided when the bearings are mounted in the bearing mounting grooves by virtue of the acting force, so that the loosening feeling after the bearings are mounted can be effectively avoided, and the whole rotor can better meet the working requirement of high-speed rotation.

Description

Technical Field

[0001] This utility model relates to the field of high-speed fan technology, and in particular to a micro high-speed fan. Background Technology

[0002] As we all know, a fan is a machine that uses input mechanical energy to increase gas pressure and discharge gas. It is a type of driven fluid machinery, as well as a gas compression and gas conveying machinery. It converts rotational mechanical energy into gas pressure energy and kinetic energy, and then transports the gas out. Fans are widely used in various places and in household appliances such as vacuum cleaners and hair dryers.

[0003] Currently, when fans are used in household appliances, they are often made into small or miniature models. However, to meet efficiency requirements, these fans need to be designed as high-speed fans, meaning they need to rotate at higher speeds. A typical fan consists of an impeller, casing, inlet and outlet, support frame, stator, rotor, and transmission components (bearings). The rotor shaft needs to be assembled with the bearings, which in turn need to be mounted on the casing or support frame. The impeller is fitted onto the rotor shaft. Due to the small size and high-speed requirements, installation is difficult, and tolerances in bearing installation can easily lead to insufficient tightness. Insufficient tightness in the bearing mounting can result in a loose feel, generating noise and affecting the rotational speed, thus posing a disadvantage to miniature high-speed fans. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a miniature high-speed fan.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A miniature high-speed fan includes a housing, an impeller, a stator, and a rotor. The housing has a central cavity, and a frame is disposed within the central cavity. The stator is fixedly installed inside the frame, and the rotor is located in the middle of the stator. One end of the frame has a through-hole, and the other end of the frame has a rear cover. Both the through-hole and the rear cover have bearing mounting grooves. Bearings on the shafts at both ends of the rotor are respectively installed in the bearing mounting grooves, so that the rotor is located between the through-hole and the rear cover. At least one shaft of the rotor has a pre-compressed spring, one end of which presses against the bearing. The impeller is disposed at the symmetrical end of the rear cover and connected to the shaft of the rotor.

[0007] Preferably, it also includes a circuit board, on which conductive pins are provided, one end of which is connected to the coil of the stator, and the other end of which passes through the rear cover and is placed outside the housing and soldered to the circuit board.

[0008] Preferably, there are six conductive pins arranged in a circular array around the perimeter of the circuit board.

[0009] Preferably, the back cover is made of insulating plastic.

[0010] Preferably, a guide plate is provided between the frame and the cavity wall of the central cavity.

[0011] Preferably, the frame is provided with flow guide holes at one end of the impeller and on the rear cover, and the flow guide holes are in communication with the interior of the frame.

[0012] Preferably, the conductive pin passes through the flow guide hole.

[0013] By adopting the above-mentioned solution, this utility model relies on a spring installed at the rotor shaft and bearing to subject both bearings to an outward pushing force. This force provides preload when the bearings are installed in the bearing mounting slot, effectively preventing looseness after bearing installation and allowing the entire unit to better adapt to high-speed rotation requirements. At the same time, using conductive pins as circuit guides places the circuit board in the external environment, isolating it from the stator, frame, and housing. This improves the heat dissipation efficiency of the circuit board, prevents excessive heat transfer to the circuit board, and extends its service life. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0015] Figure 2 This is a structural schematic diagram of another end of an embodiment of the present utility model.

[0016] Figure 3 This is a cross-sectional view of an embodiment of the present utility model. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0018] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0020] like Figures 1 to 3 As shown, this embodiment provides a miniature high-speed fan, including a housing 1, an impeller 2, a stator 3, and a rotor 4. The housing 1 has a central cavity 11, and a frame 12 is provided inside the central cavity 11. The stator 3 is fixedly installed inside the frame 12, and the rotor 4 is located in the middle of the stator 3. One end of the frame 12 has a through-hole 13, and the other end of the frame has a rear cover 14. Both the through-hole 13 and the rear cover 14 have bearing mounting grooves 15. The bearings 42 of the shafts 41 at both ends of the rotor 4 are respectively installed in the bearing mounting grooves 15, so that the rotor 4 is located between the through-hole 13 and the rear cover 14. At least one shaft 41 of the rotor 4 has a pre-compressed spring 43, one end of which presses against the bearing 42. The impeller 2 is located at the symmetrical end of the rear cover 14 and is connected to the shaft 41 of the rotor 4.

[0021] In this embodiment, a spring 43 is installed at the shaft 41 of the rotor 4 and the bearing 42. The spring 43 presses against the inner ring of the bearing 42, so that the bearings 42 at both ends are subjected to an outward pushing force. In this way, when the bearing 42 is installed in the bearing mounting groove 15, the preload force can be provided by the force, thereby effectively avoiding the looseness of the bearing 42 after installation. This allows the whole to better adapt to the requirements of high-speed rotation, reduce noise generation, and ensure stability under high-speed rotation.

[0022] Furthermore, this embodiment also includes a circuit board 5. A conductive pin 31 is provided on the stator 3. One end of the conductive pin 31 is connected to the coil of the stator 3, and the other end of the conductive pin 31 passes through the rear cover 14 and is placed outside the outer shell 1 and soldered to the circuit board 5. This design uses the conductive pin 31 as a circuit guide to place the circuit board 5 outside, so that the circuit board 5 is isolated from the stator 3, the frame 12 and the outer shell 1, thereby improving the heat dissipation efficiency of the circuit board 5 and avoiding excessive heat transfer to the circuit board 5, thus improving the service life of the circuit board 5.

[0023] Furthermore, in this embodiment, there are six conductive pins 31 arranged in a circular array around the circuit board 5. This allows for more uniform connection positions and more even force distribution on the circuit board 5 during assembly.

[0024] Furthermore, since the conductive pin 31 passes through the back cover 14, the conductive pin 31 may come into contact with the back cover 14. Therefore, in order to avoid leakage or short circuit, the back cover 14 in this embodiment is made of insulating plastic.

[0025] Furthermore, in this embodiment, the fan guide relies on the impeller 2 as the driving force, and the airflow direction is in the central cavity of the outer shell 1. Therefore, in order to converge the airflow and enhance the subsequent wind speed, a guide plate 16 is provided between the frame 12 and the cavity wall of the central cavity 11 in this embodiment. The guide plate 16 is arc-shaped, and the arc direction of each guide plate 16 is consistent.

[0026] Furthermore, to prevent backflow below the impeller 2 and its impact on the impeller's rotational speed, the frame 12 in this embodiment is provided with guide holes 17 at one end of the impeller 2 and on the rear cover 14. The guide holes 17 are connected to the interior of the frame 12, and the conductive pin 31 passes through the guide holes 17. This allows airflow to occur at the lower end of the impeller and near its interior, preventing backflow. This airflow can also pass through the stator 3 and rotor 4, thus cooling the stator 3 and rotor 4.

[0027] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A miniature high-speed fan, characterized in that: The device includes a housing, an impeller, a stator, and a rotor. The housing has a central cavity, and a frame is installed inside the central cavity. The stator is fixedly installed inside the frame, and the rotor is located in the middle of the stator. One end of the frame has a through-hole, and the other end of the frame has a rear cover. Both the through-hole and the rear cover have bearing mounting grooves. The bearings of the shafts at both ends of the rotor are respectively installed in the bearing mounting grooves, so that the rotor is located between the through-hole and the rear cover. At least one shaft of the rotor has a pre-compressed spring installed on it, with one end of the spring pressing against the bearing. The impeller is located at the symmetrical end of the rear cover and is connected to the shaft of the rotor.

2. A miniature high-speed fan as described in claim 1, characterized in that: It also includes a circuit board, on which conductive pins are provided. One end of the conductive pins is connected to the coil of the stator, and the other end of the conductive pin passes through the back cover and is placed outside the housing and soldered to the circuit board.

3. A miniature high-speed fan as described in claim 2, characterized in that: There are six conductive pins arranged in a ring array around the perimeter of the circuit board.

4. A miniature high-speed fan as described in claim 3, characterized in that: The back cover is made of insulating plastic.

5. A miniature high-speed fan as described in claim 1, characterized in that: A guide plate is provided between the frame and the cavity wall of the central cavity.

6. A miniature high-speed fan as described in claim 2, characterized in that: The frame is provided with flow guide holes at one end of the impeller and on the rear cover, and the flow guide holes are connected to the interior of the frame.

7. A miniature high-speed fan as described in claim 6, characterized in that: The conductive pin passes through the flow guide hole.

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