Air purifier

The utility model provides an air purifier, include: casing and install spiral case and the fan in the casing, the fan includes wind wheel, motor, lock nut and elasticity vibration damper, is equipped with the connecting hole on the wind wheel, be equipped with the output shaft on the motor, the output shaft includes optical axis section and the screw shaft part that is connected with the front end of optical axis section, and the length of optical axis section is greater than the degree of depth of connecting hole to make the output shaft insert the connecting hole, and make the wind wheel install in the optical axis section, locking nut installed is on the screw shaft part, elasticity vibration damper cover is established in the optical axis section to the support is between wind wheel and lock nut. The utility model provides a fan, carry on lock nut through the screw shaft part spacing, make lock nut to the locking dynamics of wind wheel by the decision of elasticity vibration damper, avoid lock nut's packing force to spend greatly and make elasticity vibration damper lose the damping effect to the vibration that makes elasticity vibration damper active absorption wind wheel produce has at work reduced the noise that the motor produced because of mechanical oscillation.