公开(公告)号：US10941784B2

公开(公告)日：2021-03-09

申请号：US16056903

申请日：2018-08-07

Applicant: GRUNDFOS HOLDING A/S

Inventor： Erik Bundesen Svarre ,  John Frigård Nielsen ,  Lars Skov

IPC: F04D29/10 ,  F16J15/34 ,  F04D29/12 ,  F04D29/42 ,  F04D1/06 ,  F04D13/06 ,  F04D17/08 ,  F04D25/06 ,  F04D29/62

Abstract: A centrifugal pump (1) includes a pump casing and a shaft (11) which is rotatably mounted therein and on which an impeller (10), for delivering fluid, is arranged rotationally fixed. A cartridge shaft seal (13) is arranged between the shaft (11) and an opening (16) of the casing, through which opening the shaft (11) is led. The cartridge shaft seal (13) includes a sleeve (22) which surrounds the shaft (11) at least in the region of the opening 16 and which is connected to the shaft (11) releasably and rotationally fixed, by way of a clamping device (29) which is arranged on the outer side of the sleeve (22). The clamping device (29) includes clamping jaws (32) which only engage on the outer side of the sleeve (22) and non-positively connect the sleeve (22) to the shaft (11).

公开(公告)号：US11378097B2

公开(公告)日：2022-07-05

申请号：US15355800

申请日：2016-11-18

Applicant: GRUNDFOS HOLDING A/S

Inventor： Erik Bundesen Svarre ,  John Frigård Nielsen ,  Finn Ulrich Storgaard ,  Iraj Babazadeh

IPC: F04D1/06 ,  F04D29/62 ,  F04D29/42 ,  F04D29/041 ,  F04D13/02 ,  F04D17/08 ,  F04D25/02 ,  F04D29/043 ,  F04D29/046 ,  F04D29/053 ,  F04D29/056 ,  F04D29/10

Abstract: A multi-stage centrifugal pump includes a pump casing, in which a shaft (8) carrying an impeller is rotatably arranged. The pump casing has a pump casing foot part (2) that includes a reversibly closable maintenance opening (60), via which a bearing and/or seal (20, 25), which is arranged at a shaft end within the pump casing, is accessible and exchangeable.

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.