Method for determining the operating level of a fan and fan

US6241463A · kind A · utility

Assignee

• Babcock-BSH GmbH · DE

Inventors

• Friedrich Bahner · Lengede, DE
• Norbert Eichhorn · Bad Hersfeld, DE
• Wilfried Moller · Bad Hersfeld, DE

Key dates

• Filing date: Jun 22, 1998
• Grant date: Jun 5, 2001
• Expiry date: Jun 22, 2018

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F05D2270/3015
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Fore many applications it is desirable to determine the operating level, i.e. the current flow rate V and the total pressure difference .DELTA.p.sub.t of a fan in the installed state without external measuring points and calibration. The invention should develop a suitable method and a corresponding fan. In the method of the invention, from a measured effective pressure difference .DELTA.p.sup.M.sub.w a flow rate V is determined and from that, via an operational characteristic curve a target value for the total pressure difference .DELTA.p.sup.s.sub.t is found. By comparing the target value .DELTA.p.sup.s.sub.t determined this way with its measured value .DELTA.p.sup.M.sub.t the operating level and its accuracy are determined. For this purpose on the fan of the invention measuring points are provided for measuring one or more effective pressure differences .DELTA.p.sup.M.sub.w and the total pressure difference .DELTA.p.sup.M.sub.t.