suck air from small to big

English to Russian Tech/Engineering Engineering (general) vacuum pump

When the pump rotor which was driven by the motor clockwise rotated, chamber 1 will suck air from small to big, and chamber 2 will complete the transmission of air, then chamber 3 will compress and exhaust air from big to small, and complete a work cycle from suction-compress-exhaust finally, achieve the vacuum of the system.