Classification of vacuum generators that create vacuum states using compressed air. Mainly ejector-type vacuum pumps utilizing the Venturi effect, used for workpiece suction/transport, vacuum chucks, vacuum packaging, and degassing operations. Unlike electric vacuum pumps, they are compressed air-driven, making explosion-proof applications easier and featuring maintenance-free operation. Key specifications include suction flow rate, ultimate vacuum level, and air consumption. Widely used in automation lines combined with suction cups and vacuum pads.