Two-stage axial flow fan with vibration and noise reduction

By combining aerodynamic optimization and mechanical vibration reduction in a dual-path design, the problem of low vibration reduction and noise reduction efficiency of axial flow fans is solved, achieving low-noise operation and high-efficiency energy conversion, and adapting to complex working conditions.

CN121345799BActive Publication Date: 2026-07-21HANGZHOU ZHIXIN ELECTROMECHANICAL DESIGN CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HANGZHOU ZHIXIN ELECTROMECHANICAL DESIGN CO LTD
Filing Date
2025-12-03
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing axial flow fans are inefficient in terms of vibration reduction and noise reduction, and their noise levels exceed the standard. Traditional rigid connection methods are complex and cannot effectively isolate high-frequency motor vibration and aerodynamic noise.

Method used

It adopts a dual-path design, combining aerodynamic optimization and mechanical vibration reduction. It reduces turbulent noise through streamlined arc transition and gradual flow channel design, uses composite damping ring to suppress resonance, and the front guide cover adopts a biomimetic shark gill structure to optimize airflow entry. The rear guide vanes rectify the airflow, and the tilting blades adjust the airflow angle to reduce noise.

Benefits of technology

It achieves low-noise operation, reduces mechanical vibration and aerodynamic noise, improves the flow guiding efficiency and energy conversion efficiency of the fan, adapts to complex working conditions, and meets industrial low-noise design specifications.

✦ Generated by Eureka AI based on patent content.

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    Figure CN121345799B_ABST
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Abstract

The application discloses a two-stage axial flow fan with vibration and noise reduction, which comprises an inner casing, a driving cavity is arranged in the middle of the inner casing, a driving shaft is rotatably arranged in the middle of the driving cavity, a driving assembly for driving the driving shaft is arranged in the driving cavity, an outer casing is arranged outside the inner casing, the inner casing is connected with the outer casing through a damping ring, a front flow guide cover and a rear flow guide cover are respectively arranged at the ends of the outer casing, a primary impeller group is arranged at one end of the driving shaft close to the front flow guide cover, and a secondary impeller group is arranged at one end of the driving shaft close to the rear flow guide cover. Through the double-path design of 'aerodynamic optimization + mechanical damping', the turbulent flow noise caused by flow rate mutation is avoided, the rectification effect of the flow guide ring at the air outlet effectively reduces the vortex intensity and aerodynamic noise, meanwhile, the damping ring effectively controls the mechanical vibration noise by inhibiting the resonance phenomenon of the shafting and the casing, and the low-noise operation of industrial sites is realized.
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