Fan capable of reducing wind noise

Abstract

The utility model discloses a fan capable of reducing wind noise, which comprises fan blades, a motor and a flow guide cover, a foot stool is arranged in the middle of the flow guide cover, a motor shaft is formed on the foot stool, the motor is fixed on the motor shaft, the motor is covered with the middle of the fan blades, and first sound insulation cotton is arranged between the middle of the fan blades and the middle of the flow guide cover. An annular air guide face is arranged in the air guide cover, second sound insulation cotton is arranged on the annular air guide face, a cavity is formed in the periphery of the air guide cover, third sound insulation cotton is arranged at an opening of the cavity, screw hole positions are formed in the periphery of the air guide cover, and fourth sound insulation cotton is arranged on the periphery of the screw hole positions and the back face of the middle of the foot stool. Wire clamping grooves are formed in the outer sides of the foot stands, and fifth sound insulation cotton is arranged on the inner sides of the wire clamping grooves. The sound insulation cotton is additionally arranged on the fan capable of reducing the wind noise, sound waves enter micropores in the surface of the porous material to cause fiber vibration, vibration energy is converted into heat energy by viscous resistance and heat loss among fibers, the structure destroys a sound wave reflection path, standing wave interference is reduced, and therefore the wind noise is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of fans, and in particular to a fan that reduces wind noise. Background Technology

[0002] As computer hardware performance improves, the need for efficient and quiet cooling systems becomes increasingly prominent. While traditional fans are effective at dissipating heat, the airflow noise they generate has become a key factor affecting user experience.

[0003] Among them, fan blade aerodynamic noise: the high-speed rotating fan blades interact with the air, causing turbulence and eddies, generating high-frequency noise (main frequency range: 100Hz–5kHz), and the discrete eddies at the fan blade edges are the main source of low-frequency noise; bearing vibration noise: the slight vibration of traditional ball bearings or oil-impregnated bearings is transmitted through the fan housing, forming mid-to-low frequency noise (20Hz–200Hz); airflow impact noise: when air flows through the fan inlet / outlet, the pressure fluctuation caused by the sudden change in air velocity forms broadband noise. Utility Model Content

[0004] One objective of this invention is to provide a fan that reduces wind noise, lowers the noise of the fan structure, and achieves a balance between heat dissipation performance and quiet operation.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A fan for reducing wind noise includes fan blades, a motor, and a shroud. A stand is located in the center of the shroud, and a motor shaft is formed on the stand. The motor is fixed to the motor shaft. The center of the fan blade covers the motor. A first sound-insulating cotton is provided between the center of the fan blade and the center of the shroud. An annular air-guiding surface is provided inside the shroud, and a second sound-insulating cotton is provided on the annular air-guiding surface. A cavity is provided around the periphery of the shroud, and a third sound-insulating cotton is provided at the opening of the cavity. Screw holes are provided around the shroud, and a fourth sound-insulating cotton is provided around the periphery of the screw holes and on the back of the center of the stand. A cable-holding groove is formed outwards on the stand, and a fifth sound-insulating cotton is provided inside the cable-holding groove.

[0007] As a preferred technical solution, the first sound insulation cotton is ring-shaped and is located on the outside of the motor.

[0008] As a preferred technical solution, the second sound insulation cotton is ring-shaped and is attached to the air guide cover. The outer density of the second sound insulation cotton is greater than the inner density of the second sound insulation cotton.

[0009] As a preferred technical solution, the shape of the third sound insulation cotton is consistent with the shape of the cavity, the shape of the fourth sound insulation cotton is consistent with the partial shape of the back of the air guide, and the shape of the fifth sound insulation cotton is consistent with the shape of the wire clamping groove.

[0010] The beneficial effects of this utility model are as follows: It provides a fan that reduces wind noise. The fan that reduces wind noise adds sound insulation cotton. The sound waves enter the micropores on the surface of the porous material, causing the fibers to vibrate. The vibration energy is converted into heat energy by the viscous resistance and heat loss between the fibers. The structure destroys the sound wave reflection path and reduces standing wave interference, thereby reducing wind noise. Attached Figure Description

[0011] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a schematic diagram of the first structure of a fan for reducing wind noise, as described in the embodiment.

[0013] Figure 2 This is a schematic diagram of the second structure of a fan for reducing wind noise, as described in the embodiment.

[0014] Figures 1 to 2 middle:

[0015] 1. Fan blades; 2. Shielding; 3. Stand; 4. First sound insulation cotton; 5. Second sound insulation cotton; 6. Third sound insulation cotton; 7. Fourth sound insulation cotton; 8. Fifth sound insulation cotton; 9. Cable tray; 10. Screw holes. Detailed Implementation

[0016] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] like Figures 1 to 2 As shown in this embodiment, a fan for reducing wind noise includes a fan blade 1, a motor, and a shroud 2. A stand 3 is provided in the middle of the shroud 2, and a motor shaft is formed on the stand 3. The motor is fixed on the motor shaft. The middle of the fan blade 1 covers the motor. A first sound insulation cotton 4 is provided between the middle of the fan blade 1 and the middle of the shroud 2. An annular air guide surface is provided inside the shroud 2, and a second sound insulation cotton 5 is provided on the annular air guide surface. A cavity is provided around the periphery of the shroud 2, and a third sound insulation cotton 6 is provided at the opening of the cavity. Screw holes 10 are provided around the shroud 2. A fourth sound insulation cotton 7 is provided around the periphery of the screw holes 10 and on the back of the middle of the stand 3. A wire clamping groove 9 is formed on the outer side of the stand 3, and a fifth sound insulation cotton 8 is provided on the inner side of the wire clamping groove 9.

[0018] In the specific structure of each sound insulation cotton component, the first sound insulation cotton 4 is ring-shaped and located on the outside of the motor to reduce discrete eddy current noise; the second sound insulation cotton 5 is ring-shaped and is attached to the air guide 2, with the outer density of the second sound insulation cotton 5 being greater than the inner density, optimizing the airflow path and reducing turbulence noise; the third sound insulation cotton 6 is shaped to match the shape of the cavity, and the cavity is formed by removing glue to ensure uniform wall thickness and reduce injection molding shrinkage, and the contoured third sound insulation cotton 6 reduces cavity vibration and whistling; the fourth sound insulation cotton 7 is shaped to match the local shape of the back of the air guide 2 to prevent resonance noise; the fifth sound insulation cotton 8 is shaped to match the shape of the wire groove 9 to reduce wind noise.

[0019] The acoustic characteristics and working principles of the first sound insulation cotton 4, the second sound insulation cotton 5, the third sound insulation cotton 6, the fourth sound insulation cotton 7, and the fifth sound insulation cotton 8 are as follows: the density is 10–200 kg / m³, the high-density material absorbs low-frequency sound waves, and the low-density material targets high-frequency noise; the porosity is 80%–95%, and the multi-level pore structure achieves wide-band sound absorption; the impedance matching is 50–1000 Hz, optimizing the acoustic impedance to adapt to the energy attenuation of sound waves at different frequencies.

[0020] The sound energy is consumed in three stages: 1. Sound wave penetration: Sound waves enter the micropores on the surface of the porous material, causing fiber vibration; 2. Kinetic energy conversion: Vibration energy is converted into heat energy by the viscous resistance and heat loss between fibers; 3. Reflection interference: The complex internal structure of the material disrupts the sound wave reflection path and reduces standing wave interference.

[0021] The technical advantages are: 1. Wideband and efficient noise reduction: covering the entire frequency band from 20Hz to 5kHz, especially targeting the sensitive area of ​​the human ear from 300Hz to 1kHz (noise reduction up to 20dB); 2. Thermal management compatibility: using hydrophobic fiber materials (contact angle >130°) to avoid accumulation affecting airflow efficiency.

[0022] Overall cost is controllable, and the sound insulation cotton reduces costs by 40% compared to traditional metal shock absorption structures. In terms of process compatibility, automated ultrasonic welding technology is used to achieve a seamless fit with the air guide shroud 2 of the fan body, with a yield rate of 98.5%. Through the multi-layer composite sound insulation cotton structure, the fan operating noise is successfully reduced while maintaining stable heat dissipation performance. Actual test data shows that this design can significantly improve the user experience in high-load scenarios such as game consoles and workstations.

[0023] It should be stated that the above-described specific embodiments are merely preferred embodiments of this utility model and the technical principles applied thereto. Within the scope of the technology disclosed in this utility model, any variations or substitutions that are easily conceived by those skilled in the art should be covered within the protection scope of this utility model.

Claims

1. A fan that reduces wind noise, characterized in that, The device includes fan blades, a motor, and a shroud. A support frame is located in the center of the shroud, and a motor shaft is formed on the support frame. The motor is fixed to the motor shaft. The center of the fan blade covers the motor. A first sound-insulating cotton is placed between the center of the fan blade and the center of the shroud. An annular air-guiding surface is provided inside the shroud, and a second sound-insulating cotton is placed on the annular air-guiding surface. A cavity is provided around the periphery of the shroud, and a third sound-insulating cotton is placed at the opening of the cavity. Screw holes are provided around the shroud, and a fourth sound-insulating cotton is placed around the periphery of the screw holes and on the back of the center of the support frame. A cable-holding groove is formed outwards on the support frame, and a fifth sound-insulating cotton is placed inside the cable-holding groove.

2. The fan for reducing wind noise according to claim 1, characterized in that, The first sound insulation cotton is ring-shaped and is located on the outside of the motor.

3. A fan for reducing wind noise according to claim 1, characterized in that, The second sound insulation cotton is ring-shaped and is attached to the air guide cover. The outer density of the second sound insulation cotton is greater than the inner density of the second sound insulation cotton.

4. A fan for reducing wind noise according to claim 1, characterized in that, The shape of the third sound insulation cotton is consistent with the shape of the cavity, the shape of the fourth sound insulation cotton is consistent with the partial shape of the back of the air guide, and the shape of the fifth sound insulation cotton is consistent with the shape of the wire slot.

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