An ultra-low-
noise mining local fan comprises an outlet silencer, a main
machine body and an inlet silencer. The main
machine body comprises a motor, an
impeller, an inner shell and an outer shell. The inlet silencer comprises a flow collector, a silencing wall, a silencing
barrel, a side air inlet and an air inlet cover plate. The ultra-low-
noise mining local fan has the beneficial effects that the inner shell and the outer shell are connected and fixed through elastic materials, and
radiation noise of the main
machine outer shell is greatly lowered; the inlet silencer achieves the purpose of primary silencing through section area changes and sudden expansion or shrinkage of the pipeline section; when sound
waves enter the silencing wall, one part of
sound energy is subjected to friction in gaps of porous materials and is converted into
heat energy to be dissipated, and therefore the purpose of secondary silencing is achieved; after the silencing wall is blocked by dust, the silencing wall can be very conveniently pulled out to be cleaned or replaced, the silencing effect is kept, and the overhauling time is short; and after part of sound
waves at the position of a sound source reach a side air inlet hole plate, one part of the sound
waves are absorbed by the silencing material, and accordingly the purpose of
tertiary silencing is achieved.