A heat dissipation fan structure

Abstract

The utility model discloses a heat dissipation fan structure relates to fan technical field, including outer frame, motor and fan blade. The motor is installed through bracket in the inside of outer frame, and the casing top end of motor is connected with the insulating plastic material's isolation end cover, and the isolation end cover top end groove body rotationally connects fan drive disc, and fan drive disc is connected with fan blade and has the axle core in the middle, and the axle core bottom end extends to the casing and is rotationally connected with the casing through ball bearing, and the casing inner wall is fixed stator, and the axle core outside fixed corresponding rotor, and the bracket recess installs circuit board and is blocked through the closing cap. This structure utilizes metal parts heat dissipation, blocks magnetic conduction through isolation end cover, reduces ball bearing electric corrosion, reduces the rotating friction, promotes fan operation stability and service life.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a cooling fan structure. Background Technology

[0002] In existing cooling fan structures, the motor shaft and housing (iron shell) are often assembled through direct connection or without effective isolation, making it easy for a magnetic conduction path to form between them. When the fan is running, the magnetic field generated by the stator and rotor is conducted to the shaft through the housing, causing the shaft to become charged. At the same time, during high-speed rotation, the ball bearings between the shaft and housing are prone to generating a small current due to the potential difference between the steel balls and the inner and outer rings, leading to electro-corrosion.

[0003] Electro-corrosion can cause pitting and accelerated wear on the surface of ball bearings, increasing fan noise and vibration, significantly shortening the lifespan of the bearing and the entire fan, and in severe cases, even causing fan jamming or failure. Furthermore, if the connection between the shaft and housing in traditional structures (such as riveting) breaks, current designs cannot effectively block magnetic conduction, leading to persistent electro-corrosion problems. This affects the stability and reliability of the cooling fan, making it difficult to meet the requirements for long-term, high-efficiency operation of the equipment. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a cooling fan structure.

[0005] This utility model proposes a cooling fan structure, including an outer frame, a motor installed inside the outer frame, fan blades installed at the drive end of the motor, a housing installed inside the outer frame, an isolation end cover connected to the top of the housing, a groove formed at the top of the isolation end cover, a fan drive disk rotatably connected inside the groove, the fan drive disk being connected to the fan blades to drive the fan blades to rotate, a shaft core connected to the middle of the fan drive disk, the bottom end of the shaft core extending into the interior of the housing, and the isolation end cover located between the fan drive disk and the housing.

[0006] Furthermore, the bottom end of the outer frame is integrally connected to the bracket, and the motor is installed in the middle of the bracket.

[0007] Furthermore, a groove is formed at the bottom of the middle part of the bracket, and a circuit board is installed inside the groove. The opening of the groove is sealed by a snap-fit ​​cap.

[0008] Furthermore, the stator is fixedly connected to the inner wall of the housing, and the rotor corresponding to the stator is fixedly connected to the outer side of the shaft core.

[0009] Furthermore, the shaft and the housing are rotatably connected by ball bearings.

[0010] Furthermore, the housing, shaft, and fan drive disk are all made of metal.

[0011] Furthermore, the isolation end cap is made of insulating plastic.

[0012] The beneficial effects of this utility model are as follows: By setting an insulating plastic end cap between the fan drive disk and the housing, and combining it with the structural design of the metal housing, shaft, and fan drive disk, the heat generated by the generator can be dissipated in a timely manner by utilizing the good heat dissipation properties of the metal material. At the same time, the insulating end cap can block the magnetic conduction path, reduce the electro-corrosion of the ball bearings caused by potential difference when rotating at high speed, and reduce the rotational friction of the shaft by using the ball bearings, thereby improving the stability and service life of the fan. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the disassembled structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the disassembled structure of the motor in this utility model;

[0015] Figure 3 This is a half-sectional view of the motor in this utility model with the rotor removed;

[0016] Figure 4 This is a schematic diagram of the structure of the inner and outer frames of this utility model;

[0017] Figure 5 This is a half-sectional view of the assembled version of this utility model.

[0018] In the diagram: 1. Outer frame; 11. Bracket; 2. Motor; 21. Housing; 22. Stator; 23. Rotor; 24. Isolation end cover; 25. Slot; 26. Shaft core; 27. Fan drive plate; 28. Ball bearing; 3. Fan blade; 4. Circuit board; 5. Cover. Detailed Implementation

[0019] Reference Figure 1-5 The present invention proposes a cooling fan structure, comprising an outer frame 1, a motor 2, fan blades 3, a circuit board 4, and a cover 5. The specific technical solution is as follows:

[0020] The outer frame 1 serves as the supporting structure for the entire cooling fan. Its bottom end has an integrally formed bracket 11, which provides a stable mounting base for the motor 2. The motor 2 is fixedly mounted in the middle of the bracket 11 using bolts or clips, ensuring that the motor 2 will not wobble during operation. The drive end of the motor 2 is connected to the fan blades 3. When the motor 2 operates, it drives the fan blades 3 to rotate synchronously, achieving the function of heat dissipation and ventilation.

[0021] Motor 2 is the core driving component of the fan, and its structure and assembly relationship are as follows:

[0022] The housing 21 of the motor 2 is made of metal, which has good structural strength and heat dissipation performance. The housing 21 is fixedly installed on the bracket 11 inside the outer frame 1.

[0023] The stator 22 is fixedly connected to the inner wall of the housing 21 by interference fit or adhesive bonding. The stator 22 is the fixed part of the motor and is used to generate a rotating magnetic field.

[0024] The top of the housing 21 is connected to the isolation end cover 24. The isolation end cover 24 is made of insulating plastic material, which can not only isolate and protect the internal structure of the motor, but also play a good insulating role to prevent safety hazards such as leakage.

[0025] The top of the isolation end cover 24 has a groove 25, and the fan drive disk 27 is rotatably connected inside the groove 25. The fan drive disk 27 is also made of metal and is fixedly connected to the fan blade 3 by bolts or snap-fit ​​so that the fan blade 3 can rotate together when the fan drive disk 27 rotates.

[0026] The fan drive plate 27 is fixedly connected to the shaft core 26 by welding or threaded connection in the middle. The shaft core 26 is made of metal and its bottom end extends into the interior of the housing 21. The rotor 23 corresponding to the stator 22 is fixedly connected to the outside of the shaft core 26 by interference fit. The rotor 23 drives the shaft core 26 to rotate together under the action of the rotating magnetic field generated by the stator 22.

[0027] To ensure the smooth rotation of the shaft core 26, the shaft core 26 and the housing 21 are rotatably connected by a ball bearing 28. The ball bearing 28 can effectively reduce the friction when the shaft core 26 rotates, reduce energy loss, and improve the operating efficiency of the motor.

[0028] A groove is formed at the bottom of the middle part of the bracket 11. The size of the groove matches that of the circuit board 4. The circuit board 4 is used to control the operating status of the motor 2, such as speed adjustment and start / stop control. After the circuit board 4 is placed inside the groove, the opening of the groove is sealed by the snap-fit ​​cover 5. The cover 5 not only protects the circuit board 4, preventing dust and moisture from entering and affecting the normal operation of the circuit board 4, but also makes the overall structure of the fan more aesthetically pleasing.

[0029] When the cooling fan is powered on, circuit board 4 supplies power to motor 2. Stator 22 generates a rotating magnetic field upon energization. Under the influence of this magnetic field, rotor 23 drives shaft 26 to rotate. Shaft 26, through fan drive disk 27, drives fan blades 3 to rotate. The rotation of fan blades 3 promotes airflow, thus achieving heat dissipation. Throughout the entire operation, the insulation provided by isolation end cover 24 ensures electrical safety. The metal housing 21, shaft 26, and fan drive disk 27 effectively dissipate the heat generated by the motor. Ball bearings 28 ensure stable and smooth rotation of shaft 26 and fan blades 3.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A cooling fan structure, comprising an outer frame (1), wherein a motor (2) is installed inside the outer frame (1), and fan blades (3) are installed at the drive end of the motor (2), characterized in that, The motor (2) includes a housing (21) installed inside the outer frame (1). The top of the housing (21) is connected to an isolation end cover (24). The top of the isolation end cover (24) has a groove (25). The inside of the groove (25) is rotatably connected to a fan drive disk (27). The fan drive disk (27) is connected to a fan blade (3) to drive the fan blade (3) to rotate. The middle part of the fan drive disk (27) is connected to a shaft core (26). The bottom end of the shaft core (26) extends into the inside of the housing (21). The isolation end cover (24) is located between the fan drive disk (27) and the housing (21).

2. The heat dissipating fan structure according to claim 1, wherein The bottom end of the outer frame (1) is integrally connected to the bracket (11), and the motor (2) is installed in the middle of the bracket (11).

3. The heat dissipating fan structure according to claim 2, wherein A groove is provided at the bottom of the middle part of the bracket (11), and a circuit board (4) is installed inside the groove. The opening of the groove is sealed by a snap-fit ​​cover (5).

4. The heat dissipating fan structure according to claim 1, wherein The stator (22) is fixedly connected to the inner wall of the housing (21), and the rotor (23) corresponding to the stator (22) is fixedly connected to the outside of the shaft core (26).

5. The heat dissipating fan structure according to claim 1, wherein The shaft (26) and the housing (21) are rotatably connected by a ball bearing (28).

6. The heat dissipating fan structure according to claim 1, wherein The housing (21), shaft (26), and fan drive disk (27) are all made of metal.

7. The heat dissipating fan structure according to claim 1, wherein The isolation end cap (24) is made of insulating plastic.

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