Without noise reduction measures, the noise emitted by the fan's intake and exhaust ports can reach 110 to 120 decibels, significantly exceeding the required standards. Industrial fans are continuous-running equipment. The International Organization for Standardization (ISO) has set a noise standard of ≤90 decibels for such equipment.

I. Introduction

The silencer for fans is mainly used for various series of high-pressure centrifugal fans to reduce aerodynamic noise at the inlet and outlet airways.

Part II: Structural Principle

This silencer for the fan is designed based on the sound absorption principle of sound-deadening panels. It boasts excellent acoustic performance and good aerodynamic properties; the structure is rational, easy to install, and is a high-airflow resistive honeycomb-type silencer. The resistive section uses multi-chamber resistive straight pipe channels and cross-shaped sound-absorbing panels, ensuring sufficient sound absorption over a wide frequency range. The FT-type silencer's structure consists of many parallel units of silencer pipes, filled with porous sound-absorbing material between the pipes. To reduce radiated sound caused by airflow-induced shell wall vibration, reinforcing ribs are set on the outer shell.