Gas escapes via the intake port (D) a. The impeller in some pumps is mounted directly on the motor shaft for non-contact compression, resulting in increased durability. When the gas enters the side channel (A) occurs, the rotating impeller (B) spirally accelerated in direction of rotation. The effect of centrifugal force ensures that the gas in the impellers (B) is accelerated radially outwards and the pressure is increased. With each re-entry into the impeller, kinetic energy is fed back to the impeller along the side channel. The cross-section of the side channel decreases at the interrupter, the gas is scraped off by the impeller and leaves the pump through the outlet opening (C). A high degree of operational safety and a long service life, even with high differential pressures, is guaranteed by the arrangement of the bearings outside the compressor chamber.
* This description does not reflect each manufacturer's approach to the technology, but represents a general description that attempts to include the basic operating principle.