Radiant tube gas burner

Abstract

A furnace-heating gas burner of the kind in which the burner head is situated at one end of a first inner pipe that is surrounded by an outer protective pipe. A first part of the inner pipe surrounds the burner head. A separate inner pipe is provided in the extension of the first inner pipe and is axially aligned with the first inner pipe. The separate inner pipe commences at the open end of the first inner pipe. At the end of the first inner pipe that faces the separate inner pipe, the outlet of the first inner pipe has an inner diameter that is smaller than the diameter of the pipe in general.

1 . A furnace-heating gas burner of the kind in which the burner head ( 1 ) is situated at one end of an inner pipe ( 2 ) which is surrounded by an outer protective pipe ( 3 ), and wherein a first part of the inner tube ( 2 ) that surrounds the burner head is provided, and wherein a separate inner pipe ( 8 ) is provided in the extension of the first pipe ( 2 ), which separate inner pipe ( 8 ) lies axially in line with the first pipe and commences at the open end of said first pipe ( 2 ), characterised in that at the end of the first pipe ( 2 ) which faces towards the separate pipe ( 8 ) the outlet of said first pipe has an inner diameter which is smaller than the diameter of the pipe in general.  
     
     
         2 . A burner according to  claim 1 , characterised in that said smaller inner diameter is 10% to 50% of the inner diameter of the first pipe ( 2 ) in general..  
     
     
         3 . A burner according to  claim 1  or  2 , characterised in that the mouth ( 10 ) of the first pipe ( 2 ) is situated essentially at the nearby opening ( 12 ) of the separate pipe ( 8 ).