公开(公告)号：US20200011309A1

公开(公告)日：2020-01-09

申请号：US16503047

申请日：2019-07-03

Applicant: GRUNDFOS HOLDING A/S

Inventor： Sergei GERZ ,  Valeri KECHLER

IPC: F04B13/00 ,  F04B49/06 ,  F04B43/04

Abstract: A Metering pump includes a displacement element (4), a drive system with an electric drive motor (12) driving the displacement element (4) and a control device (22) controlling the electric drive motor (12). The control device (22) is configured in such a manner that it detects the current position of the displacement element (4), detects the torque (M) of the electric drive motor (12) at several positions of the displacement element (4) and monitors the torque (M) in relation to the position of the displacement element (4), and a method for controlling such metering pump.

公开(公告)号：US20220412334A1

公开(公告)日：2022-12-29

申请号：US17848477

申请日：2022-06-24

Applicant: GRUNDFOS HOLDING A/S

Inventor： Klaus MÜLLER ,  Valeri KECHLER

IPC: F04B43/00 ,  F04B43/04 ,  F04B49/06

Abstract: A monitoring method and dosing pump system monitor operation of a dosing pump including a dosing chamber (2), a displacement element (4) and an electric drive (12). A position (S) of the displacement element and a pressure (P) inside the dosing chamber are continuously recorded as a curve in a pressure-stroke diagram. The method includes monitoring at least one characteristic portion (36, 38, 40, 42, B, C) of the curve in the pressure-stroke diagram by detecting a possible shift (A) of the characteristic portion over several strokes. The method further includes one or both of: adjusting a control of the electric drive based on the detected shift; and determining a trend of the shift over several strokes of the displacement element and determining based on the trend whether and/or when the shift will reach a predefined limit. A dosing pump system with the dosing pump execute the method.

公开(公告)号：US20210403201A1

公开(公告)日：2021-12-30

申请号：US17357218

申请日：2021-06-24

Applicant: GRUNDFOS HOLDING A/S

Inventor： Rainer SCHMITZ ,  Valeri KECHLER ,  Klaus MÜLLER

IPC: B65D25/48 ,  G01F23/00

Abstract: A liquid supply system includes a suction lance (6) configured to be inserted into a liquid container (14) and at least one level sensor (10, 12) fixed on the lance (6) and configured to detect a liquid level (22) inside a liquid container (14). A control device (4) is connected to the level sensor (10, 12) and configured to determine a rate of change of the liquid level (22) detected by the at least one level sensor (10, 12) and to detect a lance removal if the rate of change reaches or exceeds a predefined threshold. A method for detecting the removal of a suction lance (6) from a liquid container (14) is provided.