Impeller pumps are dry and self-primming rotary pumps. They unite the characteristics of a rotary pump and a positive displacement pump into one. The working principle is very simple: The heart of the pump is a flexible wheel (impeller), which is made of an elastomer material called Neoprene and the individual wings of the impeller are strongly bent, due to rotation, against the eccentric plate.
On the priming side, the wings spread apart through residual stress. The suction area increases. A vacuum develops, whereby the pump independently self-primes.
On the pressure side, the wings are squeezed together. Gaps become smaller and are emptied.