Adaptation of the delivery head of a centrifugal pump to a changing volumetric flow rate

US10788040B2 · kind B2 · utility

Assignee

• WILO SE · DE

Inventors

• Jens Oppermann · Schwerte, DE
• Ana-Maria Constantin · Aachen, DE

Key dates

• Filing date: Oct 22, 2015
• Grant date: Sep 29, 2020
• Expiry date: Jan 31, 2037

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02B30/70
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The present invention relates to a method of operating an electric motor-driven centrifugal pump (3) in a hydraulic system (4) having at least one self-controlled load, where a gradient (dQakt/dt) of the volumetric flow rate (Qakt) of the centrifugal pump (3) is determined and the current set-point delivery head (Hsoll) of the centrifugal pump (3) is calculated from a mathematical operation on the gradient (dQakt/dt) weighted with a gain factor (K) and the last specified set-point delivery head (Hsoll,alt). The operation describes a positive feedback between the set-point delivery head (Hsoll) and the volumetric flow rate (Qakt). The gain factor (K) is determined from a calculation instruction that is modified dynamically during operation of the centrifugal pump (3) taking into consideration the current operating point of the centrifugal pump (3) and taking into consideration a current and/or at least one past state of the hydraulic system (4).