The air-recycling aspirator is mainly used for granular materials cleaning in grain storage, flour, feed, pharmaceutical, oil, food, brewing and other industries. The air-recycling aspirator can separate low density impurities and granular materials (such as wheat, barley, paddy, oil, corn, etc.) from grain. The air-recycling aspirator adopts closed cycle air form, so the machine itself has the function of removing dust. This can save other dust removal machines. And due to it doesn’t exchange air with the outside world, therefore, it can avoid the loss of heat, and doesn’t pollute the environment.