公开(公告)号：US20210095685A1

公开(公告)日：2021-04-01

申请号：US17019060

申请日：2020-09-11

Applicant: EVOGUARD GmbH

Inventor： Johann JUSTL ,  Thomas BOCK ,  Thomas OBENDORFER

IPC: F04D29/20 ,  F04D29/10 ,  F04D7/02 ,  F04D29/42 ,  F04D29/043

Abstract: A retaining device for an impeller of a centrifugal pump, including: a pump shaft with a recess formed substantially parallel to the axis of rotation of the pump shaft; a fastening bolt, which is insertable into the recess such that a first channel is defined between the inserted fastening bolt and the pump shaft and which is connected to the pump shaft on one end thereof and provides a retainer for fixing the impeller on the other end thereof; wherein the pump shaft includes at least one further channel extending from the circumferential surface of the pump shaft up to and into the recess and allowing the first channel to be emptied.