Catapult wheel for forming particle jet, has space in communication with particle exit opening formed between pump wheel and casing

摘要

The radial distance between the pump wheel and the casing (2) increases in the pump wheel rotation direction, forming a cavity in communication with the particle exit opening. The catapult wheel (1) comprises a casing with an inlet opening and an outlet opening for the particles, a pump wheel rotatably mounted in the casing for transporting the particles from the inlet opening to the outlet opening, and scoops (3) which are located outside and essentially coaxial with casing for rotating simultaneously with the pump wheel, in order to accelerate the particles and form a particle jet.