Patent ID: 9400105
Filing Date: 2016-07-26
CPC Classification: F23C,F23D,F23R

Claim Text:
1. A premix burner for a heat generator, the premix burner, comprising: a swirl generator, having at least two burner shells which complement one another to form an axially conically widening swirl space and which mutually define, in an axial cone longitudinal direction, tangential slots through which combustion air is introduced into the swirl space, and a fuel feeder to provide a fuel into the combustion air flow arranged at least in sections along the tangential slots; a mixing tube downstream of the swirl generator for homogeneously mixing fuel and combustion air before introducing the fuel-air-mixture into a combustion chamber, where ignition occurs; a transition piece between the swirl generator and the mixing tube for transferring the flow of combustion air and fuel from the swirl generator into the mixing tube, wherein the transition piece comprises an inlet, connected to the swirl generator, an outlet, connected to the mixing tube, and a continuing flow limiting interior contour between said inlet and said outlet, wherein at least in an inlet section said interior contour is curved radially inwards towards the inner diameter of the mixing tube and wherein at the outlet, the interior contour is flush with an interior flow limiting contour of the mixing tube, wherein the radially inwards curved contour has a gradient which declines in a downstream direction, the maximal angle for the gradient being located at the inlet, wherein said radially inwards curved section of interior contour extends from the inlet of the transition piece up to its outlet.