Improved insulation for radiant burner

Abstract

A radiant burner ( 1 ) which comprises at least one radiant burner plate ( 2 ) and at least two layers of radiant screens ( 3 ) enclosed by a peripheral band ( 4 ) associated with a body ( 6 ) defining a premixing chamber for said burner. The peripheral band ( 4 ) comprises an upper flange ( 5 ). The radiant burner further comprises an insulation ( 7 ) lying under and extending downwardly from said upper flange of said peripheral band. The insulation ( 7 ) has an internal peripheral structure permitting limited movement of the layers of radiant screens ( 3 ). The insulation is a multilayer structure wherein each insulation layer engages and supports at least one screenlayer ( 3 ).

1 . A radiant burner ( 1 ) comprising at least one radiant burner plate ( 2 ) and at least two layers of screens ( 3 ) enclosed by a peripheral band ( 4 ) associated with a body ( 6 ) defining a premixing chamber for said burner, said peripheral band comprising an upper flange ( 5 ), said burner further comprising an insulation ( 7 ) lying under and extending downwardly from said upper flange of said peripheral band, said insulation ( 7 ) having an internal peripheral structure permitting limited movement of said radiant screens ( 3 ), characterised in that said insulation ( 7 ) is a multilayer insulation structure comprising more than one insulation layer, each insulation layer engaging and supporting at least one screenlayer ( 3 ). 
     
     
         2 . A radiant burner according to  claim 1 , wherein said insulation ( 7 ) has an increasing thickness starting under said upper flange ( 5 ) and extending downwardly to said radiant burner plate(s) ( 2 ). 
     
     
         3 . A radiant burner according to  claim 1 , wherein said insulation layer having at least two contacting surfaces which could provide contact with a neighbouring insulation layer, characterised in that one contacting surface has at least one flat surface and at least another profiled contacting surface. 
     
     
         4 . A radiant burner according to  claim 1 , wherein at least one of said radiant screenlayers is a metal grid. 
     
     
         5 . A radiant burner according to  claim 1 , wherein at least one of said radiant screenlayers is an arrangement of parallel spaced round rods or square bars. 
     
     
         6 . A radiant burner according to  claim 1 , wherein at least two of said radiant screenlayers are an arrangement of parallel spaced round rods or square bars. 
     
     
         7 . A radiant burner according to  claim 6 , wherein said radiant screenlayers, which are an arrangement of parallel spaced round rods or square bars are in parallel directions. 
     
     
         8 . A radiant burner according to  claim 6 , wherein said radiant screenlayers, which are an arrangement of parallel spaced round rods or square bars are in crossing directions, preferably at 90°. 
     
     
         9 . A radiant burner according to  claim 1 , wherein said multilayer insulation structure is made of ceramic material.