公开(公告)号：US11162504B2

公开(公告)日：2021-11-02

申请号：US16472596

申请日：2017-12-22

Applicant: GRUNDFOS HOLDING A/S

Inventor： Helge Grann ,  John Frigård Nielsen ,  Erik Bundesen Svarre ,  Per Frost Vedsted

IPC: F04D29/12 ,  F04D1/06 ,  F16J15/34 ,  F04D29/10 ,  F04D1/00

Abstract: A cartridge seal is provided for sealing a shaft (4) with respect to a housing (2) and is intended to be a slide ring seal arrangement (12) for a centrifugal pump. The cartridge seal includes a shaft protection sleeve which is rotationally connected to the shaft (4) by a retaining ring, a support (24) for incorporating the cartridge seal into a housing opening of the pump housing (2), a slide ring which is rotationally connected to the shaft protection sleeve and a counter slide ring which is rotationally connected to the support (24), as well as an enclosed space (30) within the sealing arrangement. The space (30) is fluidically connected to a sealing gap formed between the slide ring and the counter slide ring, and is at least partially prefilled with liquid in order to prevent dry running when the pump is operated for the first time.