Oil diffusion ejector vacuum pumps, also known as oil-sealed rotary vane pumps, are a type of vacuum pump that use an oil-sealed rotor to compress and pump gases. They are widely used in a variety of industrial and scientific applications to create and maintain high vacuum levels.

The pump works by using an oil-sealed rotor that rotates inside a sealed chamber. As the rotor turns, it compresses the gas inside the chamber, which is then expelled through an outlet valve. As the gas is expelled, a partial vacuum is created inside the chamber, which allows more gas to be drawn in and compressed.

Oil diffusion ejector vacuum pumps have several advantages over other types of vacuum pumps, such as:

High pumping speed: Oil diffusion ejector vacuum pumps can pump large volumes of gas quickly and efficiently.

High ultimate vacuum: They can achieve an ultimate vacuum of around 10^-3 mbar.

Low maintenance: Oil diffusion ejector vacuum pumps require minimal maintenance, only the oil needs to be changed periodically.

Durability: They are robust and able to withstand continuous operation.

Low noise: They operate at low noise levels.

Oil diffusion ejector vacuum pumps are widely used in a variety of industrial and scientific applications, including vacuum distillation, vacuum drying, vacuum metallurgy, vacuum coating, and vacuum impregnation. They are also used in the production of semiconductors, vacuum packaging, and vacuum heat treatment.

It is important to note that oil diffusion ejector vacuum pumps require regular maintenance and the oil should be regularly changed to avoid contamination of the pumped gas.