Fundamentals of Vacuum Pumps (High Vacuum)

What is an Ejector Pump?

An ejector pump ejects vapor or steam, such as an oil diffusion pump.
A steam ejector pump is one of the most versatile vacuum pumps in industrial ways. Its advantages over mechanical vacuum pumps are durability, low cost, and more. This article picks an oil ejector pump up. Other types, for instance, steam ejector type and water ejector type, are on other articles. Check them up!

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Ejector Pump's Applications:

  • Vacuum degassing equipment for steel
  • Distillation equipment
  • Polymerization equipment


The steam ejector pump works by water vapor fluid. It has lesser moving parts than the mechanical vacuum pump, so more durable and cheaper.
The water ejector pump works by water fluid. This pump doesn't work without other combination pumps such as oil rotary vacuum pumps and so on.

Advantage Disadvantage
Very durable due to no moving parts. Low energy efficiency.

How Ejector Pump Works

The ejector pump consists of the main body, a heating section, and a jet section. The working oil is heated in the boiler and turns into steam. The steam is ejected from jet sections of each stage at high speed. The gas on the high vacuum side is entrained in the ejected steam (diffusion) and transported from the upper jet section to the lower jet section, then exhausted from the exhaust port to the fore pump side while being compressed.
The ejected steam is cooled and condensed on the inner wall of the main body and returns to the boiler. This pumps exhausts by repeating this action.



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