Combustion membrane for a gas burner made with continuous fiber threads

Abstract

A combustion membrane for a gas burner is provided. The combustion membrane has a fabric or mesh of interlaced metal wires, having two opposite interlacing surfaces forming a combustion surface and an inner surface of the fabric or mesh, respectively. The metal wires are formed by continuous metal fibers that form a yarn of mass per length ranging from 0.8 g/m to 1.4 g/m.

What is claimed is: 
     
         1 . A combustion membrane for a gas burner, said combustion membrane having an inner side to which a combustible gas is conveyed and an outer side on which combustion of the combustible gas occurs after the combustible gas has crossed the combustion membrane, said combustion membrane comprising a fabric or mesh of interlaced metal wires, having two opposite interlacing surfaces forming a combustion surface exposed on the outer side and an inner surface facing the inner side, respectively, wherein the metal wires are formed by continuous metal fibers which form a yarn with mass per length ranging from 0.8 g/m to 1.4 g/m. 
     
     
         2 . The combustion membrane of  claim 1 , wherein said continuous metal fibers are not mutually twisted and form an untwisted yarn. 
     
     
         3 . The combustion membrane of  claim 1 , wherein the individual continuous metal fibers each have a length substantially corresponding to the length of the yarn formed therewith. 
     
     
         4 . The combustion membrane of  claim 1 , wherein the continuous metal fibers have a waviness that gives an additional extension to the yarn in a direction transverse to a longitudinal direction thereof. 
     
     
         5 . The combustion membrane of  claim 4 , wherein said waviness is a waviness with less wavelength and amplitude than the wavelength and amplitude of a knitting or weaving waviness of the fabric or mesh. 
     
     
         6 . The combustion membrane of  claim 4 , wherein said waviness is formed over the entire length of the yarn. 
     
     
         7 . The combustion membrane of  claim 1 , wherein the continuous metal fibers of a same yarn are detached from one another, at least in stretches, along more than 30%, or more than 50%, of the length of the yarn, thus making the yarn bulged. 
     
     
         8 . The combustion membrane of  claim 1 , wherein the continuous metal fibers have a circular cross-section. 
     
     
         9 . The combustion membrane of  claim 1 , wherein the fabric/mesh or mesh has a weight per area either equal to or greater than 1.2 kg/m 2 , or ranging from 1.2 kg/m 2  to 1.5 kg/m 2 , or of 1.3 kg/m 2 . 
     
     
         10 . The combustion membrane of  claim 1 , wherein:
 said continuous metal fibers are not mutually twisted and form an untwisted yarn,   the continuous metal fibers each have a length substantially corresponding to the length of the yarn formed therewith,   the continuous metal fibers have a waviness that gives an additional extension to the yarn in a direction transverse to a longitudinal direction thereof, said waviness being a waviness with less wavelength and less amplitude than the wavelength and amplitude of a knitting or weaving waviness of the fabric or mesh,   said waviness is formed over the entire length of the yarn, and   the continuous metal fibers have a circular cross-section.   
     
     
         11 . The combustion membrane of  claim 1 , wherein the metal wires consist of continuous metal fibers having a diameter ranging from 30 micrometers to micrometers, or of 40 micrometers. 
     
     
         12 . The combustion membrane of  claim 1 , wherein the metal wires is are made of an FeCrAl alloy doped with Yttrium, Hafnium, Zirconium. 
     
     
         13 . The combustion membrane of  claim 1 , wherein both interlacing surfaces form high-relief ribs alternating with low-relief valleys, and both the high-relief ribs and the low-relief valleys have an extension, in at least one direction in a plane of the fabric or mesh, three times greater than a thickness of the metal wires. 
     
     
         14 . The combustion membrane of  claim 1 , wherein the fabric or mesh has first localized areas with low permeability, alternating with second localized areas with higher permeability than the first localized areas, and wherein both the first and second localized areas have an extension, in at least one direction in a plane of the fabric or mesh, three times greater than a thickness of the metal wires. 
     
     
         15 . The combustion membrane of  claim 1 , wherein the fabric or mesh is supported by and in contact with a support layer arranged on the inner side of the combustion membrane. 
     
     
         16 . The combustion membrane of  claim 1 , wherein the metal wires are at least or only initially bound by a binder selected from a bonding thread, or a bonding adhesive, and a water-soluble binder. 
     
     
         17 . A gas burner comprising a combustion membrane according to  claim 1 .