roots blower vacuum pump

A Roots blower vacuum pump, also known as a Roots pump or Roots booster pump, is a type of mechanical vacuum pump that uses two rotating impellers (often resembling figure-8 shapes) to move gas and create a vacuum. It’s a positive displacement pump, meaning it traps a fixed volume of gas and moves it, rather than compressing the gas within the pump itself. Roots blowers are frequently used as mechanical boosters in vacuum systems to achieve higher pumping speeds and deeper vacuum levels.

Here’s a more detailed explanation:

How it works:

Non-contact operation:
The two impellers rotate in opposite directions within the pump housing without touching each other or the housing.
Gas displacement:
As the impellers rotate, they trap a volume of gas between the impeller and the housing and move it from the inlet to the outlet side.
Backing pump:
Roots blowers are not capable of creating a vacuum on their own. They are typically used in conjunction with a backing pump (like a rotary vane pump) to compress the gas against the atmosphere and achieve a deeper ultimate vacuum.

Key features and applications:

High pumping speeds:
Roots blowers excel at moving large volumes of gas, making them ideal for applications requiring fast pump-down times.
Deep vacuum range:
When used as a booster pump, a Roots blower can significantly improve the ultimate pressure achievable by a vacuum system.
Dry compressing:
Most Roots blowers are dry-compressing pumps, meaning they don’t rely on oil for sealing, which is beneficial for applications where oil contamination is undesirable.
Typical applications:
Roots blowers are used in a variety of applications, including:
Vacuum metallurgy
Coating
Solar cell manufacturing
Vacuum packaging
Pulp and paper drying
Pneumatic conveying