The difference between twin screw pump and screw vacuum pump

The twin-screw pump adopts a double-suction structure, and both ends of the screw are in the same pressure chamber, and the axial force can be balanced by itself. The bearings at both ends are externally equipped and lubricated by lubricating oil (Grease) alone, so it is not affected by the conveying medium. The two screws are driven by a pair of synchronous gears, and there is no contact between the tooth surfaces of the screw, it can transport materials containing particles, gases, and liquids.

The screw vacuum pump is the use of a pair of screws, in the pump casing for synchronous high-speed reverse rotation and the suction and exhaust function of the pumping equipment, can pump out gas occasions containing a large amount of water vapor and a small amount of dust.

The conveying medium is different: the screw pump mainly transports liquid, while the screw vacuum pump mainly transports gas, and the conveying medium is obviously different.

Different components: screw vacuum pump shell for double shell structure. The front and rear outer layers are metal pump shells. The inner shell includes a volute, front guard, and rear guard. The front volute and rear volute can be made of high chromium alloy cast iron or made of rubber. The impeller is composed of blades, back blades, front cover and rear cover. The twin-screw pump is mainly composed of pump body, Bushing, screw sleeve and main driven shaft.

Twin-screw pumps are mainly used in: oil fields: used as oil, gas, water, trace fine solid particles and other multi-phase mixed transport pumps and crude oil transfer pumps; Shipbuilding industry: used as marine loading pumps, bottom sweeping and sewage treatment, main engine lubrication pump, fuel oil pump; Petrochemical industry: used as a loading and transportation pump for various resins, pigments, paraffin, paint, ink, latex, various oil products, crude oil, heavy oil, etc.; Thermal power plant: used as a heavy oil, crude oil pump, main engine lubricating oil pump; Food industry: used as alcohol, honey, syrup, juice, animal and vegetable oil, milk, soy sauce delivery pump.

Screw vacuum pumps are mainly used in the semiconductor industry, chemical industry, film industry, petrochemical, food and other evaporation, drying, polymerization, sublimation, distillation, distillation, distillation, negative pressure concentration and other processes.