US 12,455,076 B2
Method for evaluating a quasi-stationary pressure difference detectable by a sensor at a gas boiler, and associated gas boiler
Enno Jan Vrolijk, Dalen (NL); Jens Hermann, Landshut (DE); Markus Weingart, Rottenburg (DE); Andreas Kerschreiter, Eching (DE); and Bernhard Simon, Munich (DE)
Assigned to ebm-papst Landshut GmbH, Landshut (DE)
Filed by ebm-papst Landshut GmbH, Landshut (DE)
Filed on Oct. 19, 2022, as Appl. No. 17/969,003.
Claims priority of application No. 10 2021 127 225.4 (DE), filed on Oct. 20, 2021.
Prior Publication US 2023/0118991 A1, Apr. 20, 2023
Int. Cl. F23N 1/02 (2006.01); F23N 5/18 (2006.01); F23N 5/24 (2006.01)
CPC F23N 5/242 (2013.01) [F23N 1/022 (2013.01); F23N 5/184 (2013.01); F23N 2005/185 (2013.01); F23N 2225/04 (2020.01); F23N 2227/16 (2020.01); F23N 2231/12 (2020.01); F23N 2235/12 (2020.01)] 10 Claims
OG exemplary drawing
 
1. A method for evaluating a quasi-stationary pressure difference detectable by a sensor at a gas boiler, the sensor is a differential pressure sensor or a mass flow sensor, the gas boiler has a mixing device, a fan, a main flow regulator, a control valve and a safety valve, the mixing device mixes a fuel flowing in from a fuel inlet and air flowing in from an air inlet to form a fuel-air mixture, the fan is for intake of the fuel and the air through the mixing device, the main flow regulator limits a mass flow of the fuel into the mixing device, the control valve, arranged upstream of the main flow regulator, controls a mass flow of the fuel into the mixing device, the safety valve, arranged upstream of the control valve, interrupts the mass flow of the fuel, the method comprising:
detecting a differential pressure between a pressure at a measuring point upstream of the main flow regulator and downstream of the control valve and a reference pressure (p0, p1) at a reference measuring point;
transmitting the differential pressure to an electronic evaluation system;
comparing the differential pressure during a pre-purge phase where the safety valve is closed with the differential pressure after the pre-purge phase; and
detecting an error by the comparison;
the error is a non-existent or unconnected sensor and/or a poor or non-existent connection of the sensor to the measuring point and/or the reference measuring point,
detecting a pressure difference between the pressure (p2) at the measuring point, which is located upstream of the main flow regulator and downstream of the control valve, and a reference pressure (p0, p1) at a reference measuring point; and
recognizing, via the electronic evaluation system, the sensor as not present or not connected and/or as having a poor or non-existent connection to the measuring point and/or the reference measuring point if the differential pressure is outside a predetermined tolerance range.