(19)
(11) EP 3 971 475 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
20.07.2022 Bulletin 2022/29

(43) Date of publication A2:
23.03.2022 Bulletin 2022/12

(21) Application number: 21191591.3

(22) Date of filing: 17.08.2021
(51) International Patent Classification (IPC): 
F23N 1/00(2006.01)
(52) Cooperative Patent Classification (CPC):
F23N 1/002; F23N 2227/00
(84) Designated Contracting States:
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 States:
BA ME
Designated Validation States:
KH MA MD TN

(30) Priority: 22.09.2020 GB 202014984

(71) Applicant: Bosch Thermotechnology Ltd (UK)
Worcester, Worcestershire WR4 9SW (GB)

(72) Inventors:
  • Lankhorst, Franciscus Theodorus Josefus Leonardus
    7227NC Toldijk (NL)
  • Voordendag, Remko
    7423 EG Deventer (NL)
  • Leerkes, Danny
    7391 HN Twello (NL)
  • Bootsveld, Eric
    8111CJ Heeten (NL)
  • Collins, Tom
    Worcester, WR3 8XA (GB)
  • English, Samuel
    Warndon, WR49SW (GB)

(74) Representative: Bee, Joachim 
Robert Bosch GmbH, C/IPE P.O. Box 30 02 20
70442 Stuttgart
70442 Stuttgart (DE)

   


(54) AN AIR-GAS MIXTURE BURNING APPLIANCE WITH A VARIABLE EQUIVALENCE RATIO IGNITION SEQUENCE


(57) In an air-gas mixture burning appliance (100) that comprises a burning unit (120) for burning a combustible air-gas mixture (130, 131), a flame detector (150) for sensing presence of a flame (122) in the burning unit (120), an air-gas mixing unit (110) that is arranged upstream of the burning unit (120) for mixing of air and gas to form the combustible air-gas mixture (130, 131), and a gas supply unit (116) that is arranged upstream of the air-gas mixing unit (110), the gas supply unit (116) is adapted to regulating a flow of gas to the air-gas mixing unit (110) such that the combustible air-gas mixture (130, 131) has a variable equivalence ratio between gas and air that is based on whether the flame detector (150) senses the presence of the flame (122) or fails to sense the presence of a flame (122) in the burning unit (120).







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