公开(公告)号：US20240418172A1

公开(公告)日：2024-12-19

申请号：US18701510

申请日：2022-10-27

Applicant: GRUNDFOS HOLDING A/S

Inventor： Robert GREVE ,  Kristian ABILDGAARD

IPC: F04D15/00

Abstract: The invention relates to a method of controlling a power limit (P) of a circulating pump (1) comprising a critical component (4) and a first temperature sensor (5) arranged and configured to measure the temperature of the critical component. The first temperature sensor may be arranged on top of, below, integrated with, or in the vicinity of the critical component. The method comprises monitoring the temperature (T) of the critical component by use of the first temperature sensor and using an output signal (6) from the first temperature sensor as a first temperature input signal (7) to a controller (8). By use of the controller and based on the first temperature input signal, the power limit of the circulating pump is controlled in accordance with a performance derating curve for the circulating pump. The invention further relates to a system (3) for controlling a power limit of a circulating pump by use of such a method.

公开(公告)号：US20180010609A1

公开(公告)日：2018-01-11

申请号：US15645036

申请日：2017-07-10

Applicant: Grundfos Holding A/S

Inventor： Olav JENSEN ,  Ole HANSEN ,  Bent DØSSING ,  Robert GREVE

IPC: F04D15/00 ,  F04D13/06 ,  F04D29/08 ,  F04D29/22

Abstract: A pump assembly includes pump casing (2), an impeller (14) rotatably arranged in the pump casing, a two rotation directions (A, B) electrical drive motor connected to drive the impeller and a valve arrangement (28) arranged in the pump casing to switch a flow path downstream of the impeller between two exits (24, 26) of the pump casing, depending on a rotation direction of the impeller. The valve arrangement includes a first movable valve element (34) at a first exit (24) and a second movable valve element (36) at a second exit (26). The first valve element partly closes the first exit in a closed position and is movable into an opened position by flow in the first rotation direction and the second valve element partly closes the second exit in a closed position and is movable into an opened position by flow in the second rotation direction (B).