Subsonic axial fan construction and design method

Abstract

The application provides a subsonic axial flow fan structure and a design method, the fan structure comprising a sound absorption body arranged at the periphery of fan blades, the sound absorption body comprising a ring-shaped plate and a ring-shaped Helmholtz muffler, the ring-shaped Helmholtz muffler and the ring-shaped plate being connected to form a ring-shaped structure in sequence from the inside to the outside. The sound absorption structure of the application adopts a micro-perforated plate in series connection with multiple parallel Helmholtz mufflers, can convert sound energy into heat energy in the sound propagation process, and can realize resonance sound elimination at the blade passing frequency and its multiple frequency bands of the fan, reduce the sound pressure level of specific frequency bands, improve the problem of narrow absorption frequency band of the micro-perforated plate, and realize overall sound elimination of the fan. The structure is small in size, thin in thickness, and strong in adaptability, and will not greatly change the original structure of the fan.

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