公开(公告)号：US20220220970A1

公开(公告)日：2022-07-14

申请号：US17302075

申请日：2021-04-22

Applicant: KOREA WATER RESOURCES CORPORATION

Inventor： Sang Hyun OH

IPC: F04D29/24

Abstract: A variable impeller for a pump is proposed. The variable impeller includes a hub to which a shaft is mounted, a plurality of vanes radially arranged around the hub outward from the hub, and extension wings tightly locked to the plurality of vanes and extending length of each of the vanes. The length of the vane is adjusted in response to the pumping head that is changed by a flow rate of fluid, the pump is operated within a high efficiency section, an expensive impeller rotation speed control device is not required, and energy is reduced by reducing power consumption of the pump. In addition, during the work of changing the pumping head, the replacement of the extension wings may be quickly completed while only a part of a pump housing is opened to expose only the impeller without separating the entire assembly of the impeller from the pump.