Clean Technology of Modern Vacuum Systems

Dry Screw Vacuum Pump: A High-Efficiency Solution

A dry screw vacuum pump is a highly efficient positive displacement vacuum pump designed to generate low and medium vacuum without the use of oil inside the pumping chamber. By utilizing two synchronized screw rotors rotating in opposite directions, the pump provides clean, environmentally friendly, and reliable gas evacuation. This makes it widely used in chemical, pharmaceutical, semiconductor, and other high-technology industries. Vacuum generation is a critical technological requirement in many industrial and scientific processes. Traditional oil-lubricated vacuum pumps can provide sufficient vacuum performance; however, they carry the risk of contaminating the working environment. To overcome these limitations, dry vacuum technology was developed, where the pumping process is performed without the use of liquid lubricants or sealing fluids. The dry screw vacuum pump has become one of the most advanced solutions in the field of oil-free vacuum technology.

• Operating Principle

  
  
  

  
  
  

  The pump operates based on the positive displacement principle. Inside the pump housing, two screw-shaped rotors are installed, which:
  - rotate synchronously in opposite directions
  - do not come into contact with each other
  - create sealed working chambers

  Main Process Stages:
  Suction — Gas enters through the inlet port into the cavities formed between the screw rotors and the pump housing.
  Transportation — As the rotors rotate, the gas is transported along the axis of the screws.
  Compression and Discharge — The volume of the working chamber decreases, compressing the gas, which is then discharged through the outlet port. The absence of contact between the rotors eliminates friction and mechanical wear, while the absence of oil in the pumping chamber guarantees a clean vacuum environment среды.

  
  

• Technical Characteristics

  
  
  

  
  
  

  Ultimate pressure: up to 10⁻² – 10⁻³ mbar
  Pumping capacity: from tens to hundreds of liters per second
  Continuous operation capability: 24/7 operation
  Cooling system: air or water cooling
  Rotor synchronization: gear-driven synchronization mechanism
  Due to internal gas compression, the pump provides stable operation across a wide range of inlet pressures.
  

• Applications

  
  
  

  
  
  

  Dry screw vacuum pumps are widely used in:
  Chemical industry — vacuum distillation, degassing processes;
  Pharmaceutical industry — freeze drying (lyophilization), sterilization;
  Food industry — vacuum packaging;
  Semiconductor manufacturing;
  Metallurgy — vacuum melting, heat treatment;
  As backing pumps for turbomolecular vacuum pump systems.
  They are particularly valuable in processes where the presence of oil contamination is unacceptable.
  

• Advantages of Dry Screw Vacuum Pump Technology

  
  
  

  
  
  

  Oil-Free Operation. The absence of oil eliminates contamination of technological processes and reduces operating and maintenance costs.
  High Reliability. The rotors do not contact each other, which minimizes mechanical wear and significantly extends equipment service life.
  Resistance to Aggressive Media. Special rotor coatings allow operation with corrosive gases, solvent vapors, and humid process environments.
  Environmental Safety. No oil emissions are generated, and there is no need for disposal of contaminated operating fluids.
  Wide Operating Range. Efficient operation from atmospheric pressure down to deep vacuum conditions.
  

• Limitations

  
  
  

  Despite numerous advantages, dry screw vacuum pumps have several specific characteristics:
  бhigher initial cost compared with oil-lubricated vacuum pumps;
  need for cooling during intensive operation;
  limited ultimate vacuum level compared with turbomolecular vacuum systems.
  

• Technical Specifications

  
  
  

  JSC “Vacuummash” is developing advanced vacuum technologies and presents a new product range: NVV-650 dry screw vacuum pump, NVV-650M dry screw vacuum pump, NVV-1200 dry screw vacuum pump. The pumps operate in the pressure range from: 10 Pa to 10⁻⁷ Pa. Pumping speed: from 630 m³/h to 12,600 m³/h

  
  
  

• Purchase Dry Screw Vacuum Pumps NVV-650, NVV-650M, NVV-1200

  
  

  The dry screw vacuum pump represents a modern engineering solution combining: clean process operation; high reliability; industrial efficiency. Thanks to oil-free technology, it meets modern requirements for environmental safety and high technological precision. With the continued development of microelectronics, pharmaceutical manufacturing, and chemical technologies, the importance of dry screw vacuum pumps continues to grow, providing stable and clean vacuum conditions for advanced industrial processes.

  
  
  

  ➜ CONTACT OUR SPECIALISTS for selecting vacuum equipment at the manufacturer’s price
  ➜ VACUUM EQUIPMENT CATALOG is available on the official VACMA.RU website
  

  +7 (843) 278-35-27 kazan@vacma.ru JSC Vacuummash (Vacma) plant: 58 Tulskaya St., Kazan, 420054, Russian Federation