Guide ring structure, semi-open axial flow fan and air conditioner

By improving the guide ring structure and adopting a combination design of arc-shaped and straight guide sections, the periodicity of the vortex is disrupted, and the backflow at the blade tip gap is cut off. This solves the problems of blade tip leakage and vortex noise in semi-open axial flow fans, thereby increasing air volume and reducing noise.

CN224432915UActive Publication Date: 2026-06-30GREE ELECTRIC APPLIANCE INC OF ZHUHAI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
GREE ELECTRIC APPLIANCE INC OF ZHUHAI
Filing Date
2025-07-17
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing semi-open axial flow fans in air conditioning outdoor units suffer from blade tip clearance leakage and blade tip vortex noise, resulting in reduced air volume and efficiency. Existing guide ring structures cannot effectively optimize flow loss and noise.

Method used

The design of the guide ring structure includes an arc-shaped guide section and a straight guide section. The arc-shaped guide section has radial and axial undulation curves, and the straight guide section has a protruding structure on the inner side to disrupt the vortex periodicity, cut off the backflow path of the blade tip clearance, and optimize flow stability and noise.

Benefits of technology

It effectively reduces the range and intensity of tip vortex influence, lowers vortex noise, increases fan airflow, optimizes performance, increases airflow by about 2%, and reduces noise sound pressure level by about 0.7 dB(A).

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model discloses a guide ring structure, a semi-open axial flow fan, and an air conditioner. The guide ring structure includes a guide ring with an arc-shaped guide section and a straight guide section. Airflow flows from the arc-shaped guide section to the straight guide section. The inner diameter of the arc-shaped guide section gradually decreases from the inlet end to the outlet end, and the arc-shaped guide section has a wavy outer edge. The wavy outer edge uniformly undulates in the radial direction of the guide ring to form a smooth and continuous radial undulation curve, and the wavy outer edge uniformly undulates in the axial direction of the guide ring to form a smooth and continuous axial undulation curve. This utility model, through the improvement of the guide ring shape, effectively reduces the influence range and intensity of tip vortices in the fan system and tip leakage losses, reduces vortex noise, and optimizes the performance of the axial flow fan.
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