CENTRIFUGAL PUMP Russian patent published in 1995 - IPC

FIELD: fan engineering. SUBSTANCE: working wheel is mounted in the space of the centrifugal fan housing. The working wheel consists of carrying disk, covering disk and profiled blades which is bent to the back and interposed between the disks. Each of the blades are provided with longitudinal projection having curved working and face surfaces at the outlet part of the blade and ring space which is open from the side of blade wall. There are openings in the carrying and covering disks in the zone of the face of the projection. The openings connect the space of the housing with the projection space. The axis of each opening is parallel to the guide cylindrical surface of the projection face. Small passage assembly is arranged from the outside of the disks. The assembly has converging passages arranged tangentially to the disk openings and connected with the openings. The disk openings can be conical. EFFECT: enhanced efficiency. 2 cl, 4 dwg