Small-delta H variable-flow centrifugal pump impeller device

The invention discloses a small-delta H variable-flow centrifugal pump impeller device. The small-delta H variable-flow centrifugal pump impeller device comprises an impeller device 1, an inlet device2, a sliding sleeve device 3 and a limiting nut 4, wherein the impeller device 1 comprises a hub 11, n layers of front cover plates 12, one layer of back cover plate 13 and (n+1) layers of blades 14;the inlet device 2 comprises a inlet shell 21, a limiting sliding rod 22, a sliding rod bracket 23 and a sliding groove 24; and the sliding sleeve device 3 comprises a sliding sleeve bracket 31 and amovable sliding sleeve 32. The small-delta H variable-flow centrifugal pump impeller device can determine to open all or part of channels in the impeller by adjusting the displacement of the movablesliding sleeve according to the requirement of system flow, thereby guaranteeing that that outlet pressure is basically not changed when the centrifugal pump regulates and controls different flows under the normal work condition