Global Patent Index - EP 3224593 A1

EP 3224593 A1 20171004 - PUMP CONTROL FOR LOW FLOW VOLUMES

Title (en)

PUMP CONTROL FOR LOW FLOW VOLUMES

Title (de)

PUMPENSTEUERUNG FÜR NIEDRIGE DURCHFLUSSMENGEN

Title (fr)

COMMANDE DE POMPE POUR DES VOLUMES À FAIBLE DÉBIT

Publication

EP 3224593 A1 20171004 (EN)

Application

EP 15862407 A 20151127

Priority

  • SE 1451444 A 20141127
  • SE 2015051276 W 20151127

Abstract (en)

[origin: WO2016085400A1] The invention relates to a method for controlling a gas flow of a pump for high flow rates at a low average flow rate by changing the gas pressure inside a cavity in said pump, said method comprising the steps of: decreasing the gas pressure in said cavity, during a first predetermined time period; increasing the gas pressure in said cavity during a second predetermined time period; stopping the active change of gas pressure during at least a third predetermined time period; and wherein the decreased gas pressure and the increased gas pressure are predefined to overcome an opening resistance of an inlet valve and an outlet valve, respectively. The invention further relates to a pump assembly for high flow rates operated at a low average flow rate comprising: a number of pumps; a pump motor with a number of windings adapted to drive said pumps; a control unit adapted to control said pump motor; wherein said number of pumps is equal to said number of stator windings or where the motor can momentarily increase its force on the pumps.

IPC 8 full level

G01N 1/22 (2006.01); F04B 1/04 (2020.01); F04B 43/02 (2006.01); F04B 49/00 (2006.01)

CPC (source: EP US)

F04B 35/04 (2013.01 - EP US); F04B 41/06 (2013.01 - EP US); F04B 45/043 (2013.01 - EP US); F04B 45/047 (2013.01 - EP US); F04B 49/02 (2013.01 - EP US); F04B 49/06 (2013.01 - US); F04B 49/20 (2013.01 - EP US); G01N 1/24 (2013.01 - EP US); G01N 1/2273 (2013.01 - EP US)

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)

WO 2016085400 A1 20160602; EP 3224593 A1 20171004; EP 3224593 A4 20181010; JP 2018503764 A 20180208; US 2017328359 A1 20171116

DOCDB simple family (application)

SE 2015051276 W 20151127; EP 15862407 A 20151127; JP 2017527858 A 20151127; US 201515528832 A 20151127