Gas burner with at least three rings

Abstract

A gas burner has a burner base formed with inner and outer upwardly open annular base chambers each connected to a respective gas supply. An inner burner on the burner base has gas outlet orifices that create an inner flame ring. An annular outer burner on the burner base has inner gas outlet orifices on its inner annular periphery creating an intermediate flame ring and outer gas outlet orifices on its outer annular periphery creating an outer flame ring. This outer burner also has two coaxial and separate inner and outer annular gas chambers that are downwardly open toward the burner base. The outlet orifices of the intermediate flame ring open into the inner annular gas chamber while the gas outlet orifices of the outer flame ring open into the outer annular gas chamber.

1 . A gas burner having at least three flame rings, the burner comprising:
 a burner base formed with a inner and outer upwardly open annular base chambers and having a respective gas supply connected to each of the annular base chambers;   an inner burner provided on the burner base, having its own gas supply, and having gas outlet orifices that create an inner flame ring, and   an annular outer burner provided on the burner base, surrounding the inner burner, having inner gas outlet orifices ( 3   a ) on its inner annular periphery creating an intermediate flame ring, and having outer gas outlet orifices on its outer annular periphery creating an outer flame ring, the annular outer burner has having two coaxial and separate inner and outer annular gas chambers that are downwardly open toward the burner base, the gas outlet orifices of the intermediate flame ring opening into the inner annular gas chamber while the gas outlet orifices of the outer flame ring open into the outer annular gas chamber, each of the separate annular gas chambers of the outer burner being in fluid communication with a respective one of the annular upwardly open gas chambers formed in the burner base.   
     
     
         2 . The gas burner according to  claim 1 , wherein the annular outer burner is formed by upper and lower superimposed annular elements, the upper annular element having the separate annular gas chambers and the respective gas outlet orifices opening into these chambers, while the lower annular element has a number of first passages, in particular, holes between the element's upper side and lower side on a first outer diameter that fluidically connect the respective juxtaposed annular gas chambers of the outer flame ring, and has a number of second passages, in particular, second holes on a second inner diameter that fluidically connect the respective juxtaposed annular gas chambers of the intermediate flame ring. 
     
     
         3 . The gas burner according to  claim 2 , wherein the angular distance between the first passages is identical to the angular distance between the second passages, in particular centers of the passages, which are holes, being aligned radially. 
     
     
         4 . The gas burner according to  claim 3 , wherein a passage is provided in at least one region, in particular, each region between two angularly adjacent first passages and second passages, which passage extends between outer and inner annular surfaces of the lower annular element, in particular, in order to deliver secondary air from an outer region of the gas burner to a region between the inner burner and the outer burner. 
     
     
         5 . The gas burner according to  claim 2 , wherein a gap is formed between the superimposed lower and upper annular elements from the outer annular gas chamber of the upper annular element, which gap is supplied with gas, is circumferential, and opens at the outer periphery of the outer burner formed by the two annular elements. 
     
     
         6 . The gas burner according to  claim 1 , wherein the lower surfaces of the annular gas chambers are in the burner base in planes that are oppositely inclined from the horizontal. 
     
     
         7 . The gas burner according to  claim 1 , wherein each annular gas chamber of the burner base has a maximum depth in the region of its respective gas supply and a minimum depth in an opposite region, in particular, at the site of the gas supply of the respective other annular gas chamber. 
     
     
         8 . A method of operating a gas burner according to  claim 1 , wherein the flame rings independently supplied with gas are all supplied with gas at a maximum level starting from the an initial position of a control element, in particular, of a knob of at least one valve, and by adjusting the control element in one constant direction starting with the outer flame ring and then with the intermediate flame ring, the flame size is turned down in each case until the flame is extinguished, and is turned up in the opposite direction. 
     
     
         9 . The method according to  claim 8 , wherein after the outer and intermediate flame rings are extinguished the inner flame ring is turned down,
 a) either until it is extinguished, or   b) to the level of its minimum output, or   the inner flame ring is operated continuously independently of the flame size setting of the other flame rings, in particular, always with the same flame size.   
     
     
         10 . The method according to  claim 9  as set forth in alternative a, wherein the control element can be moved back and forth between two end positions, wherein
 starting from each of the two possible end positions as the initial position ignition of all flame rings is effected at a maximum output, or can at least be effected, and in response to moving the control element in the direction of the other end position a successive turning-down of the individual flame rings is effected starting with the outer flame ring through the intermediate flame ring to the inner flame ring, in each case until they are extinguished.