roots vacuum pump

roots vacuum pump which is oil free for vacuum coating

The Roots vacuum pump is usually used in series with a pre-stage pump (e.g. screw pump, rotary vane pump, water ring pump, etc.). By means of a pair of high-speed counter-rotating figure-of-eight rotors, a periodic suction and discharge process is formed in the pump chamber.

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Description

Roots vacuum pumps are specialized devices designed for efficient and clean vacuum generation across a range of industrial applications. Due to their structural and operational characteristics, Roots vacuum pumps cannot exhaust directly to the atmosphere and must be used in conjunction with a preliminary (foreline) pump to provide initial airflow extraction.

Technical Parameters

  • Power: 1.1 kW to 100 kW
  • Pumping rate: 250 m³/h to 4300 m³/h
  • Ultimate pressure: 4000 Pa to 8000 Pa

Characteristics of Roots Vacuum Pump

  1. Stability: Low vibration and noise during operation ensure smooth system performance and minimal environmental impact.
  2. Energy saving: Low power consumption and high efficiency reduce operational costs.
  3. Fast startup: Quick start-up and rapid attainment of target vacuum levels improve system efficiency.
  4. Oil-free design: No lubricating oil required, preventing contamination and suitable for clean applications.
  5. Anti-overload protection: Equipped with a relief valve to automatically prevent overload, enhancing operational safety.
  6. Dual-type design: Available as standard and relief-valve-equipped models for routine and demanding applications, respectively.

Working Principle

The core mechanism consists of two high-speed, intermeshing rotors rotating in opposite directions inside the pump chamber. As the rotors turn, air is drawn in from the intake port, compressed, and pushed toward the exhaust port, achieving effective gas discharge. The precise fit between rotors and chamber ensures stable and controlled gas flow. Roots pumps operate oil-free, making them ideal for applications requiring high gas purity. For optimal performance, Roots pumps are typically paired with a foreline pump.

Application Areas

  • Chemical industry: Stable vacuum environments for chemical reactions and gas purification.
  • Pharmaceutical industry: Used in vacuum drying, evaporation, and sterilization to ensure drug quality and efficient production.
  • Vacuum coating: Provides efficient gas extraction, ensuring film layer quality in coating processes.
  • Food industry: Ideal for vacuum packaging, drying, and preservation to maintain food quality.
  • Smelting and metal processing: Gas extraction in smelting and casting, reducing harmful gas concentration and enhancing safety.
  • Electronics industry: Maintains clean vacuum environments for precision electronic component production.
  • Solar energy industry: Enhances performance and efficiency in solar cell manufacturing and surface treatment through precise vacuum control.
  • Distillation and freeze-drying: Suitable for processes involving water vapor, often used with screw pumps and condensers for optimal results.