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How Does a Vacuum Pump work?

Liquid Ring Vacuum Pump Technology: How does it work?

Liquid ring vacuum pumps and compressors are rotating positive displacement pumps. This liquid ring vacuum pump technology is mostly used for vacuum pumps but can sometimes be used in gas compressors as well. Liquid ring vacuum pumps compress gas by rotating impellers. Liquid is then fed into the pump and forms a moving cylindrical ring. This results in the formation of compression chambers. Gas is usually drawn into the vacuum pump through an inlet port at the end of the casing. This gas, usually air, is then trapped in the compression chambers created by the impeller vanes and the liquid ring. A reduction in volume is caused by the impeller rotation which then compresses the gas. This leads to the discharge or exhaust port at the end of the casing. Liquid ring vacuum pumps are used in a variety of applications, from vacuum printing to filtration and distillation. The diagram below shows the movement of liquid through the pump.

How Do Liquid Ring Vacuum Pumps Operate?

  • When the impeller turns, the operating liquid is put into motion and accelerated. This forms a liquid ring
  • The liquid ring rotates, centered along the housing, while the impeller is located concentrically. The remaining space between the impeller blades is varying along the rotation creating the suction chamber.
  • The gas gets compressed and exhausted on the pressure side.
  • The heat of compression is absorbed from the operating liquid.

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