Noise reduction fan wall for shell-free centrifugal fan

The invention discloses a noise reduction fan wall for a shell-free centrifugal fan.The noise reduction fan wall comprises a fan box body, a flow collector, an impeller, a flow guide plate, a porous noise reduction wavy partition plate and a volute tongue.The box body is a shell-free fan box body.The shell-free centrifugal fan is placed in the box body.The inlet end of the flow collector and an air inlet are connected and fixed.The impeller is a volute-free centrifugal fan impeller with eight blades.The flow guide plate is connected with an impeller cover.The whole molded line conforms to the log spiral rule, and the whole flow guide plate is of a half-surrounded structure relative to the whole impeller.The porous noise reduction wavy partition plate is made of noise reduction materials.The volute tongue is located at the bottom of the outlet of the box body and connected with the bottom and the two sides of the box body.The efficient, energy-saving and low-noise fan wall can be obtained through three improve