Helical impeller high-rotation-speed Roots blower

The invention provides a spiral impeller high rotation speed Roots blower, which comprises a casing, a wall plate, an oil tank and a high speed variable frequency motor, the casing is fixedly connected with the oil tank through the wall plate, a driving shaft and a driven shaft are symmetrically arranged in the casing, and the driving shaft comprises a left bearing section, a middle shaft section, an oil seal section, a right bearing section and a gear section. A left tensioning section is arranged between the left bearing section and the middle shaft section, knurls are arranged on the outer surface of the left tensioning section, a right tensioning section is arranged between the middle shaft section and the oil seal section, knurls are arranged on the outer surface of the right tensioning section, and a V-shaped groove is formed between the right tensioning section and the oil seal section. The impeller of the blower adopts a four-blade spiral design; meanwhile, the impeller is made of aluminum alloy, so t