Roller cell pump
The roller cell pump is a special type of positive displacement pump . The structure is similar to a vane pump , but with roller cell pumps there is rolling friction instead of sliding friction.
Layout and function
Roller cell pumps consist of an eccentrically rotating rotor, which, however, compared to a vane cell pump, has to be made significantly larger in relation to the surrounding stator . Radial guides in which the rollers run are worked into the rotor . There are inlet and outlet slots in the wall of the stator. If the pump shaft is driven, the rollers in the guides are placed against the stator wall by means of centrifugal force . Since the rotor is mounted eccentrically, the volume increases on the side with the inlet opening, while it decreases on the side with the outlet opening. This causes the pump to start working. The drive is generally electrical .
use
Such pumps are typically used as fuel pumps for intake manifold injection systems. Since the rollers on the stator wall mainly cause rolling friction, there is little wear. This type of positive displacement pump generates pressures of up to 6 bar .