Double-layer noise reduction air guide ring and fan thereof

By using a double-layer noise-reducing air guide ring structure, and utilizing a resonant cavity and sound-absorbing materials to reduce fan noise, the problem of high noise and low efficiency of existing fans has been solved, achieving high-efficiency and low-noise fan operation.

CN115823021BActive Publication Date: 2026-08-18FANS TECH ELECTRIC CO LTD
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Patent Information

Application Number
CN202211666478.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-12-23
Publication Date
2026-08-18
Estimated Expiration
2042-12-23

AI Technical Summary

Technical Problem

The existing overlapping axial flow fan's guide ring structure results in high fan noise and low efficiency, mainly because the blades are too close to the guide ring inlet, creating airflow turbulence.

Method used

It adopts a double-layer noise reduction air guide ring structure, including an inner layer and an outer layer. The outer layer is equipped with a resonant cavity and sound-absorbing material, while the inner layer performs secondary rectification. The resonant cavity reduces low-frequency noise, and the airflow after rectification in the outer layer enters the resonant cavity to consume sound energy, while the sound-absorbing material reduces high-frequency noise.

Benefits of technology

It effectively reduces fan noise, improves fan efficiency, optimizes sound quality, reduces airflow turbulence, and achieves efficient and low-noise operation.

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Abstract

The application discloses a double-layer noise reduction air guide ring, which comprises an inner air guide ring layer and an outer air guide ring layer. The inner air guide ring layer comprises a circular ring segment, a mounting panel, an inlet flow guide segment and an outlet diffuser segment. The inlet flow guide segment and the outlet diffuser segment are fixedly connected with the two ends of the circular ring segment respectively. The inlet flow guide segment is in a circular arc shape. The mounting panel is fixedly connected with the side of the inlet flow guide segment, which is away from the circular ring segment. The outer air guide ring layer comprises a flat segment, a circular arc segment and a partition plate. The end of the circular arc segment, which is close to the inner air guide ring layer, is provided with an outer layer outlet end. The end of the circular arc segment, which is away from the inner air guide ring layer, is provided with an outer layer inlet end. The mounting panel and the flat segment are provided with a connecting structure. The partition plate is provided with a plurality of partition plates. The resonant cavities between the adjacent partition plates are different in size. The application further discloses a fan comprising the double-layer noise reduction air guide ring. The application has the advantages of high fan efficiency and low air inlet noise.
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