SCREW VACUUM PUMPS

Driven directly by an integrated frequency inverter, these pumps no longer require any drive transmission. The area in which the units work is 100% oil-free. The integrated speed governor optimizes the use of energy by matching delivery to actual demand. This creates high efficiency levels and minimizes energy consumption. Suction air remains pulsation-free all the time. Various accessories, such as intake filter, non-return valve, sound absorbs as well as the air delivery and discharge system, are integrated in the completely soundproof cover structure.

Advantages

  • dry running
  • process safe and economical
  • high vacuum in one stage
  • low noise level
  • application specific options
  • long up-times
  • maintenance friendly
  • Flushing / CIP capable
  • insensitive against water shocks
  • high water vapor tolerance
  • short evacuation time due to high suction capacities
  • process safe and reliable
  • low compression temperatures

Areas of applications examples

Chemical industry


  • Drying
  • Distillation
  • Fractionation
  • Evaporation
  • Degassing
  • Cooling

Surface technology / electronics


  • Vacuum metallurgy

General applications


  • Dust extraction systems
  • Drying
  • Coating
  • Metallurgy
  • Cleaning
  • Industrial furnaces

Pneumatic Conveying


  • Centralized vacuum systems

R&D / laboratory


  • Different process applications

Packaging


  • Centralized vacuum systems for food processing / packaging
  • Centralized vacuum systems non food packaging

Advantages

  • dry running
  • process safe and economical
  • high vacuum in one stage
  • low noise level
  • application specific options
  • long up-times
  • maintenance friendly
  • Flushing / CIP capable
  • insensitive against water shocks
  • high water vapor tolerance
  • short evacuation time due to high suction capacities
  • process safe and reliable
  • worldwide service

Areas of applications examples

Chemical industry


  • Drying
  • Distillation
  • Fractionation
  • Evaporation
  • Degassing
  • Cooling

Surface technology / electronics


  • Vacuum metallurgy

Industry


  • Dust extraction systems
  • Drying
  • Coating
  • Metallurgy
  • Cleaning
  • Industrial furnaces

Pneumatic Conveying


  • Centralized vacuum systems

R&D / laboratory


  • Different process applications

Packaging


  • Centralized vacuum systems for food processing / packaging
  • Centralized vacuum systems non food packaging

Principle of Operation

Within the pumps housing (C), without friction and at very tight clearance two parallel screw-shaped rotors (A, B) rotate in a opposite direction. The rotation of the rotors is synchronized by a precision gear (D). One screw rotor has a right-hand thread and the other with a left-hand thread. Compression chambers (E) are formed by the housing and the specific shape of the screw rotors. Due to the opposite rotation of both screws the chamber connected with the suction port (G) is enlarged and the gas is transported into the compression chamber. The arrow indicates the axial movement of the chambers within the housing. On the pressure side, the chamber is moved against the axial housing wall and the volume is reduced until the front surface of the screw opens the pressure channel and the pre-compressed gas is discharged through the pressure connection (F). Cooling is achieved by water chambers (H), additional cooling gas and similar methods, depends on the manufacturer and the size of the pump.

*This description does not consider the approach of each manufacturer to the technology, but represents a generalized description that tries to cover the basic operating principle.

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