A premix burner for a heat generator has partial cone shells ( 5 ) which make up a vortex generator, and which encompass a conically widening vortex chamber ( 6 ) and mutually define tangential air inlet slots ( 7 ), and also with feeds for gaseous and/or liquid fuel, of which at least one is arranged along the air inlet slots ( 7 ) on the partial cone shells ( 5 ), and at least one other is arranged along a burner axis (A) which centrally passes through the vortex chamber ( 6 ). At least n partial cone shells ( 5 ) encompass the vortex chamber ( 6 ), and define n air inlet slots ( 7 ), with n≧3, preferably n≧5, the n air inlet slots ( 7 ) each have at least a maximum slot width ( 10 ) which is equal to or larger than that slot width ( 10 ) which a generic type premix burner ( 1 ) of the same size and dimensioning with m≦2 partial cone shells ( 5 ) and m air inlet slots ( 7 ) has.
1. A premix burner for a heat generator, the burner comprising:
a conically widening chamber with an inside diameter defining the size of a vortex chamber and an axial length defining the length of the premix burner;
at least five partial cone shells making up a vortex generator encompassing the vortex chamber, wherein the partial cone shells mutually define tangential air inlet slots having slot widths and an outside premix burner diameter;
wherein the cone shells are configured and arranged to inject at least one gaseous fuel or liquid fuel along the air inlet slots; and
a feed arranged along a burner axis which centrally passes though the vortex chamber;
wherein the premix burner is configured so that the output capacity of the premix burner is greater than the output capacity of a premix burner with the same burner length, inside diameter, and outside diameter, and less than five said partial cone shells by the number of partial cone shells, and the shape and size of the cone shells that define inlet slot widths being at least the same size as a burner with less than five said partial cone shells.
2. The premix burner as claimed in claim 1 , further comprising:
a tubular mixing element forming a mixing path downstream to the vortex generator; and
a transition piece with n transfer passages between the vortex generator and the mixing path for transfer of a flow when formed in the vortex generator into the flow cross section of the mixing path.
3. The premix burner as claimed in claim 2 , wherein the tubular mixing element is formed at least in sections as a diffuser in the through-flow direction.
4. The premix burner as claimed in claim 3 , wherein the mixing element directly downstream of the transition piece has a first flow section with a constant through-flow cross section; and further comprising
a second flow section, with a through-flow cross section which conically widens in the flow direction by an angle α, connected downstream to the first flow section.