公开(公告)号：US20180073509A1

公开(公告)日：2018-03-15

申请号：US15700666

申请日：2017-09-11

Applicant: Grundfos Holding A/S

Inventor： Christian MADSEN

IPC: F04D9/02 ,  F04D1/06 ,  F04D13/06 ,  F04D15/00 ,  E03B7/04

CPC classification number: F04D9/02 ,  E03B7/04 ,  F04D1/00 ,  F04D1/06 ,  F04D9/001 ,  F04D9/005 ,  F04D9/006 ,  F04D13/06 ,  F04D13/16 ,  F04D15/0005 ,  F04D15/0066

Abstract: A centrifugal pump assembly (2) includes an impeller, an electric drive motor (4), driving the impeller (12), and a back-flow channel (24), forming a flow connection from a delivery side (18) to a suction side (16). A valve (26), in a pressure-dependent manner, closes the flow connection. A control device (28) adjusts/sets the speed (n) of the drive motor (4), and is configured with a venting function for venting the centrifugal pump assembly (2) on operation. According to the venting function, after the detection of an air accumulation, the speed (n) of the drive motor (4) is automatically reduced, and subsequently the speed (n) is rapidly increased again. A method is also provided for removing an air accumulation from a centrifugal pump assembly during operation, which method includes reducing the speed (n) of the centrifugal pump assembly and subsequently rapidly increasing the speed (n) of the centrifugal pump again.