Structure of Dry Screw Vacuum Pump

The Working Principle of Screw Vacuum Pump

A pair of parallel helical rotors are installed in a dry screw vacuum pump, one of which rotates clockwise while the other rotates counterclockwise. The two rotors are kept in synchronous opposite rotation by a pair of gears inside the pump body.

There is no friction between the rotors and between the rotors and the pump body, and there is a certain gap between them. The two rotors and the pump body form a sealing cavity, and the number of sealing cavities is equal to the number of rotation rings of the rotors.

The Working Principle of Screw Vacuum Pump

When the two rotors rotate, the sealed cavity space connected with the suction port gradually decreases during the rotation process, and the gas is compressed to the exhaust port. When the pump is operated for a long time, a proper amount of cooling water should be introduced into the jacket of the pump body and the end cover to cool the pump.

Since the compression heat is mainly produced on the exhaust side, in order to cool the rotor sufficiently, the dry screw vacuum pump can introduce a proper amount of air or other suitable gas into the pump chamber through the air injection port under most working conditions.

Performance Characteristics of Dry Screw Vacuum Pump

1. Anti-corrosion design: All components in contact with gas phases are coated with nickel-plated or Teflon layers to prevent corrosion of compression chamber components by gases.

2.The oil-free and water-free pure system operates with a clean working process, which greatly facilitates the recovery of chemical gas media.

3.The mechanical design of the low-noise system ensures long service life, low vibration, low noise and low wear consumption by eliminating metal-to-metal contact.

4.Low exhaust temperature: The rotor is cooled by water jacket system, which can regulate the gas temperature by internal strengthening cooling in the compression area.

5.Short gas path to prevent gas condensation and rust formation in the chamber.

6.Compact integrated unit with small footprint.

7.Low vacuum and high flow rate

The dry screw vacuum pump delivers a maximum vacuum pressure of 0.01 Torr, operates continuously at any pressure level, and features a highly efficient screw rotor.