Roots vacuum pump is a kind of crude vacuum acquisition equipment, which is widely used in papermaking, chemical industry, medicine, building materials, food, clothing, sugar and other industries. It is the ideal equipment for the vacuum dehydration of the suction box of the long screen of the paper industry or the suction box of the long screen paper machine. Compared with water ring vacuum pump in this range, Roots vacuum pump has the advantages of high pumping speed, high efficiency, compact structure, small size, easy maintenance, long life and low power consumption. The suction medium can be a mixture of dry, wet air or water, but the medium must not contain granular substances, high dust gases or corrosive substances.