Method for producing silencing device, silencing device and air purifier

An air purifier, comprising:

• a housing, an air inlet, an air outlet, a fan module and a silencing device, wherein the silencing device comprises:
• a sound insulation mesh plate and silencing cotton attached to the sound insulation mesh plate, wherein a plurality of meshes are in the sound insulation mesh plate, and the silencing cotton is located on an air outlet side of each mesh, wherein the sound insulation mesh plate and the silencing cotton is cooperatively configured to reduce a sound with the frequency value which exceeds the sound wave frequency limit for the air purifier,
• and wherein the air inlet is disposed in a peripheral lateral surface of a lower part of the housing, the air outlet is disposed in a top of the housing, an air duct structure is disposed between the air inlet and the air outlet, the fan module is located in the air duct structure, the silencing device is mounted within the air duct structure between the fan module and the air outlet.