Global Patent Index - EP 4027020 A1

EP 4027020 A1 20220713 - MULTISTAGE PUMP SYSTEM AND PUMPING ARRANGEMENT

Title (en)

MULTISTAGE PUMP SYSTEM AND PUMPING ARRANGEMENT

Title (de)

MEHRSTUFIGES PUMPSYSTEM UND PUMPANORDNUNG

Title (fr)

SYSTÈME DE POMPE À PLUSIEURS ÉTAGES ET AGENCEMENT DE POMPAGE

Publication

EP 4027020 A1 20220713 (EN)

Application

EP 22167420 A 20220408

Priority

EP 22167420 A 20220408

Abstract (en)

A multistage pump system for conveying a fluid is proposed, comprising a multistage pump (1) and a control unit (20),wherein the multistage pump comprises a pump unit (3) arranged in a pump housing (30), and a drive unit (4) arranged in a drive housing (40),wherein the control unit (20) is configured for controlling the drive unit (4),wherein the pump housing (30) comprises a pump inlet (21) for receiving the fluid with a suction pressure, and a pump outlet (22) for discharging the fluid with a discharge pressure,wherein the pump unit (3) comprises a pump shaft (5) for rotating about an axial direction (A), and a plurality of impellers (31, 32, 33) for conveying the fluid from the pump inlet (21) to the pump outlet (32), with each impeller (31, 32, 33) being mounted to the pump shaft (5) in a torque proof manner,wherein the drive unit (4) comprises a drive shaft (42) for driving the pump shaft (5), and an electric motor (41) for rotating the drive shaft (42) about the axial direction (A), andwherein the control unit (20) is configured to drive the electric motor (41) at different rotational speeds.The control unit (20) is configured to operate the electric motor (41) in a first mode (M1), in which the control unit (20) operates the electric motor (41) at a constant rotational speed, and in a second mode (M2), in which the control unit (20) operates the electric motor (41) at a constant engine load, wherein the control unit (20) is further configured to switch from the first mode (M1) to the second mode (M2), when a control parameter (CP) that is indicative of a rate of change of the engine load exceeds a presettable threshold value (D). Furthermore a pumping arrangement is proposed.

IPC 8 full level

F04D 31/00 (2006.01); F04D 1/06 (2006.01); F04D 15/00 (2006.01); F04D 17/12 (2006.01); F04D 25/06 (2006.01); F04D 27/02 (2006.01)

CPC (source: EP)

F04D 1/06 (2013.01); F04D 15/0066 (2013.01); F04D 17/122 (2013.01); F04D 25/0686 (2013.01); F04D 27/0261 (2013.01); F04D 31/00 (2013.01); F05D 2270/304 (2013.01); F05D 2270/335 (2013.01)

Citation (applicant)

Citation (search report)

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

DOCDB simple family (publication)

EP 4027020 A1 20220713

DOCDB simple family (application)

EP 22167420 A 20220408