CENTRIFUGAL PUMP (EMBODIMENTS) Russian patent published in 2020 - IPC F04D29/16 

FIELD: pumps.

SUBSTANCE: invention relates to pump engineering, particularly, to centrifugal pumps. Centrifugal pump has at least one pump stage, which has centrifugal wheel (5) capable of rotation, having suction hole (6), which is sealed relative to fixed part (1) of pump by means of sealing system, wherein this sealing system has sealing ring (9) between centrifugal wheel (5) and fixed part (1) of pump. Sealing system is designed so that it is at least in the mode of pump injection, if viewed in circumferential direction of sealing ring (9), has sequentially next to each other, located at a distance from the opposite sealing surface and adjacent to the opposite sealing surface sealing areas. O-ring (9a, 9e, 9f) has on its outer perimeter sealing sections (10, 16, 16a) that are preferably parallel to each other.

EFFECT: better sealing of surface between suction opening of pump and its fixed part during operation and at the same time reducing losses for friction.

13 cl, 9 dwg