Centrifugal pump, has external shovel on the circular coaxial cover disk forming a gap with the pump housing inner wall so that part of the conveyed liquid flows back to the suction face of the motor-wheel

摘要

The pump has a motor-wheel (1) with a suction face on which process fluid is axially supplied. A circular coaxial cover disk (4) covers the shovels (3) on the suction face, with an external shovel (8) on the disk forming a gap (7) with the pump housing inner wall (6) so that part of the conveyed liquid flows back to the suction face.