Dry screw vacuum pumps are advanced vacuum devices that cater to diverse industrial applications with their oil-free, water-free operation and exceptional performance. This article outlines the key features of dry screw vacuum pumps and offers practical Selection Guide for Dry Screw Vacuum Pumps for your specific needs.

I. Performance Characteristics of Dry Screw Vacuum Pumps

1. Corrosion-Resistant Design
   Components in contact with gases are coated with nickel or Teflon to prevent corrosion of the compression chamber and extend the equipment’s lifespan.
2. Oil-Free and Water-Free Operation
   The pure working process ensures contamination-free recovery of chemical gases, meeting stringent environmental standards.
3. Low-Noise System Design
   Non-contacting metal and component interfaces result in reduced vibration, low noise, minimal wear, and extended operational life.
4. Low Exhaust Temperature
   Water-jacket cooling of the rotors strengthens internal cooling in the compression zone, enabling precise temperature regulation.
5. Short Gas Path Design
   This feature prevents gas condensation, reduces dew formation, and avoids chamber corrosion for longer-lasting performance.
6. Compact Integrated Design
   The pump occupies minimal space, making it suitable for applications with limited installation areas.
7. High Efficiency in Low Vacuum and High Flow Scenarios
   Capable of achieving an ultimate vacuum pressure of 0.01 Torr, these pumps deliver excellent efficiency across various pressure ranges.

II. Selection Guide for Dry Screw Vacuum Pumps

1. Ultimate Pressure Requirements
   The pump’s ultimate pressure should be approximately one order of magnitude lower than the process’s working pressure requirements.
2. Operational Pressure Range
   Ensure the pump’s operating point lies within its permissible pressure range to avoid damage during extended use.
3. Gas Handling Capacity
   The pump must be capable of fully discharging all gases generated during the process at its operating pressure.
4. Choosing Vacuum Pump Sets
   • When a single pump cannot meet vacuum and exhaust requirements, a combination of pumps may be required, such as Roots pumps paired with screw pumps.
   • Consider the characteristics of the gases being evacuated. For example, Roots-rotary vane pump combinations are unsuitable for systems with high condensable gas content.
5. Oil Contamination Concerns
   • If oil-free operation is required, opt for oil-free vacuum pumps, such as water ring pumps or cryogenic pumps.
   • For less stringent requirements, oil-sealed pumps with anti-contamination measures like cold traps or baffles may suffice.
6. Gas Composition and Properties
   Assess whether the gas contains condensable vapors, particulates, or corrosive elements. Install auxiliary equipment like condensers or dust filters on the pump’s intake if necessary.
7. Environmental Impact
   Evaluate whether oil mist from oil-sealed pumps would affect the environment. If pollution is unacceptable, choose oil-free pumps or exhaust the oil vapor outdoors.
8. Vibration Control
   Determine whether the pump’s vibrations would impact the process or environment. If necessary, select vibration-free pumps or implement anti-vibration measures.

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