(19)
(11) EP 0 949 453 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
23.02.2000 Bulletin 2000/08

(43) Date of publication A2:
13.10.1999 Bulletin 1999/41

(21) Application number: 99302724.2

(22) Date of filing: 07.04.1999
(51) International Patent Classification (IPC)7: F23D 14/58
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 08.04.1998 JP 9586298
01.03.1999 JP 5256699

(71) Applicant: Rinnai Kabushiki Kaisha
Nagoya-shi, Aichi-ken (JP)

(72) Inventors:
  • Sobue, Tsutomu, c/o Rinnai Kabushiki Kaisha
    Nakagawa-ku, Nagoya-shi, Aichi-ken (JP)
  • Tanaka, Akio, c/o Rinnai Kabushiki Kaisha
    Nakagawa-ku, Nagoya-shi, Aichi-ken (JP)

(74) Representative: Abrams, Michael John et al
Haseltine Lake & Co, Imperial House, 15-19 Kingsway
London WC2B 6UD
London WC2B 6UD (GB)

   


(54) Burner plate


(57) A burner plate (3a) is incorporated in a gas burner for burning a mixture of a fuel gas and air added at a predetermined excess air ratio in total primary combustion to heat a heat exchanger. The burner plate comprises a heat-resistant plate having a plurality of burner ports (7) defined therein and extending from a surface of the plate to an opposite surface thereof. The burner ports are divided into a plurality of burner port groups (8) which are spaced from each other by gaps (9). The burner port groups include burner port groups each having in a central area (7a) thereof as many burner ports closed as effective to limit an extension of flames produced from the burner port groups and suppress combustion resonant sounds generated by vibrations of the flames in coaction with a natural frequency of the gas burner.






Search report