EJECTOR Russian patent published in 1994 - IPC

FIELD: pumping. SUBSTANCE: front edges of blades of coaxially mounted screw insert are stepped. Front edges of the blade of lesser diameter are positioned within an active nozzle. Inner edges of the blades are located at ejector axis. Front and trailing edges of the blades of grater diameter have alternative radius that increases from the nozzle. Each blade of the step of grater diameter has a slot that begins from radius equal to or grater than radius of outlet section of the nozzle. The slots are directed from ejector axis to a wall of a mixing chamber. Radius of each point of line of the slot increases with increasing the distance from the outlet section of the nozzle. Parts of the blades positioned downstream of the slot are bent smoothly in the direction of swirling over the line that passes through the beginning of the slot. Longitudinal slot grooves that form longitudinal cantilever blades between them are provided in the blades of the insert from the side of the trailing edges. EFFECT: enhanced efficiency. 18 cl, 7 dwg