Vacuum pumps / systems

As general rule, vacuum pumps are pumps that convey gases and/or steam and therefore generate pressures on the suction side that are below atmospheric pressure. There are various operating principles and designs of vacuum pumps with the most diverse advantages and disadvantages, which are suitable for various processes and applications. Our product portfolio includes pumps for rough vacuum ( suction pressure minimum 1 mbar) and here mainly liquid ring vacuum pumps, if necessary with upstream vacuum ejectors (gas jet pumps), side channel compressors and partly also rotary vane pumps.

Liquid ring and rotary vane vacuum pumps operate similarly. The eccentric arrangement of the impeller leads to the formation of a delivery chamber that increases in size during the first half of a rotation and then decreases again. This initially reduces the internal pressure and the pump sucks in. In the second part of the rotation, compression to suction pressure takes place.

The advantage of a liquid ring pump here is that the sealing of these chambers against the housing at the end faces of the rotor is realised mechanically without contact by the liquid ring and not by pressing the slides against the housing.
Furthermore, due to their principle, liquid ring pumps are very good at conveying steam, liquids and even particles under certain conditions.

To build up and maintain the liquid ring, fresh liquid must be continuously supplied to the pump. Depending on the process and application, it is possible that the liquid escaping with the exhaust gas is collected again and returned to the pump cooled.
In most cases, water is used as the operating fluid. However, a variety of other media (acetone, petrol, brake fluid, etc.) can also be used, depending on requirements and their physical properties.