GB1251279A - - Google Patents

Abstract

1,251,279. Gas burners. GAZ DE FRANCE. 2 Dec., 1969 [11 Dec., 1968], No. 58889/69. Heading F4T. A gas burner 1 comprises an atmospheric induction mixer 2, an enclosure 3 mounted on a bearing plate 5 and forming a distribution chamber 4 for a mixture of combustible gas and primary air from the mixer 2 to a burner head 7, the burner head 7 having a through passage aligned with a central passage 6 of the enclosure 3 and a plurality of slots 8 which extend through the head 7 to connect the distribution chamber 4 to atmosphere, a groove 14 being formed in the upper surface 7b of the burner head 7 to connect the central areas 8c of the slots 8, the burner 1 also comprising a radiation plate 9 above the burner head 7 and supported on a dirt-arrestor plate 10 between the burner head 7 and the radiation plate 9, the dirtarrestor plate 10 having an opening 11 aligned with and of greater area than the burner head 7. As shown, the burner head 7 is circular with radial slots 8 arranged in groups 15 and each slot 8 is defined by side walls lying in planes substantially perpendicular to the axis of the passage 6 and each side wall has edges transverse to said axis and spaced from each other such that the spacing at the outer end 8a of the side wall is less than the spacing at the inner end 8b and the spacing in the central part 8c is less than that at each of the ends 8a, 8b. The outer end 8a is closed by an upper annular part 3b of the enclosure 3 and the inner end is closed by a heel 7a of the burner head which heel 7a rests on the top of a central wall 3a of the enclosure 3, the wall 3a defining the central passage 6 in alignment with the through passage of the burner head 7 whereby secondary air is drawn into the vicinity of the burner head 7. A thermostat 16 is situated in the central passage 6 and traverses the through passage in the burner head 7 and the thermostat includes a casing 16b having a base secured to the bearing plate 5 and a sensing element 16a arranged for axial displacement in the casing 16b against the action of a spring 16c and to traverse a central hole 9b in the radiating plate 9, which plate 9 is formed with fins 9a each in the form of a spiral as viewed from below. A flash tube 17 is situated below the dirt-arrestor plate 10 and has its upstream end fixed relative to a notch 18 in the enclosure 3 aligned with a slot 8. The burner may also be a straight elongated burner.