Premix gas burner

Abstract

An air/gas premix burner is disclosed. The air/gas premix burner includes a fan for sending an air/gas mixture towards a combustion head and a gas valve for regulating the introduction of combustible gas. The air/gas premix burner also includes an air/gas mixer, which comprises a localized pressure loss device, and a combustion head. The air/gas mixer includes two channels. One of the channels is provided with two hinged flaps that are designed to open and close for regulating the flow rate of the mixture.

1 . A premix gas burner of comburent/combustible gas, comprising the following components:
 ventilating means for sending the comburent and the comburent/combustible gas mixture to a combustion head;   means for regulating the inlet of combustible gas;   a system for mixing comburent/combustible gas comprising localized pressure loss means; and   a combustion head provided with a device for igniting the mixture comburent/combustible gas and for detecting the presence of the flame;   wherein said mixing system comprises a plurality of channels for mixing the comburent with the combustible gas, and wherein the mixing channels but one are provided with first plugging means for adjusting the rate of flow of the mixture through said channels but one; said first plugging means having a weight and a shape suitable for opening the passage to the air, or to the air/gas mixture in a sequence and with pressure difference values higher than a predefined minimum;   premix gas burner characterized in that it is provided, in correspondence to each gauged gas inlet channel of all venturi channels provided with said first plugging means, with second plugging means having a weight and a shape suitable for opening a gas passage in said channel in coincidence with the beginning of the opening of said first plugging means.   
     
     
         2 . A premix gas burner according to  claim 1 , characterized in that it has a longitudinal plane of symmetry (X), substantially vertical, or horizontal, or oblique. 
     
     
         3 . A premix gas burner according to  claim 1 , characterized in that in the opening step the barycentre of said second plugging means moves upwards under the thrust of the air/gas mixture, and in the closing step it automatically closes again thanks to its own weight. 
     
     
         4 . A premix gas burner according to  claim 3 , characterized in that said second plugging means are coupled to a respective hinge arranged on a flow divider element.