Gas burner

Abstract

A gas burner ( 100 ) is described including a variable speed fan ( 104 ) controlled to give an optimum gas/air mixture. The control is provided using a microprocessor with the gas valve position or measured characteristics of the output flame as feedback. The gas burners includes improved outlet slots to ensure optimum flame contact with a cooking vessel.

1 . A gas burner comprising: 
 a burner housing including at least one internal cavity and at least three openings, all being in fluid communication with said internal cavity,    an outlet assembly including a number of outlet ports in fluid communication with said a first of said openings, and a burner cap attached to said outlet assembly,    adjustable gases supply means for providing an adjustable flow of gaseous fuels, in fluid communication with a second of said openings,    oxygen supply means for providing a flow of gases at least containing oxygen, in fluid communication with a third of said openings, and    pressurisation means associated with said third opening for pressurising said flow of gases at least containing oxygen,    wherein in use pressurisation means causing said flow of gases at least containing oxygen to flow through said internal cavity and mix with said adjustable flow of gaseous fuels, the combination thereof flowing through said first opening and then said number of outlet ports to be combusted, and said adjustable gases supply means being readily accessible and removable, through the removal of said outlet assembly.    
     
     
         2 . A gas burner as claimed in  claim 1  wherein said pressurisation means comprises a variable speed fan.  
     
     
         3 . A gas burner as claimed in claims  1  or  2  wherein said outlet assembly includes a venturi through which said adjustable flow of gaseous fuels flows, thereby causing said flow of gases at least containing oxygen to mix with said flow of gaseous fuels.  
     
     
         4 . A gas burner as claimed in any one of  claims 1  to  3  further comprising control means and means for supplying a variable relating to the gases flow rate of said flow of gaseous fuels to said control means, whereby said control means varies the energisation of said pressurisation means according to said variable.  
     
     
         5 . A gas burner as claimed in any one of  claims 1  to  4  wherein said burner housing includes a spiral volute connecting said first opening to said second opening.  
     
     
         6 . A gas burner comprising: 
 a burner housing including at least one internal cavity and at least three openings, all being in fluid communication with said internal cavity,    an outlet assembly including a number of outlet ports in fluid communication with said a first of said openings, said number of outlet ports encompassing a substantial portion of the outer circumference of said outlet assembly around number of outlet ports,    adjustable gases supply means for providing an adjustable flow of gaseous fuels, in fluid communication with a second of said openings, and    oxygen supply means for providing a flow of gases at least containing oxygen, in fluid communication with a third of said openings,    wherein in use said flow of gases at least containing oxygen flows through said internal cavity and mixes with said adjustable flow of gaseous fuels, the combination thereof flowing through said first opening and the said number of outlet ports to be combusted.    
     
     
         7 . A gas burner as claimed in  claim 6  wherein the total commutative width of said number of outlet ports is greater than 70% of the outer circumference of said outlet assembly around number of outlet ports.  
     
     
         8 . A gas burner as claimed in  claim 6  or  7  wherein the vertical height of said number of outlet ports is less than 2 mm.  
     
     
         9 . A gas burner as claimed in  claim 8  wherein the vertical height of said number of outlet ports is 1 mm.  
     
     
         10 . A gas burner as claimed in any one of  claims 6  to  9  wherein each of said number of outlet ports are angled at a radial angle greater than 0 degrees.  
     
     
         11 . A gas burner as claimed in  claim 10  wherein each of said number of outlet ports are angled at a radial angle between 40 to 50 degrees.  
     
     
         12 . A gas burner as claimed in  claim 11  wherein said number of outlet ports are divided into a number of sections, there being a space on the outer circumference of said outlet assembly between outlet ports at the opposing limits of adjacent sections, said space adapted to in use permit a finger of a trivet juxtaposed directly above said space without the flames from said outlet ports substantially impinging on said finger.  
     
     
         13 . A gas burner as claimed in any one of  6  to  12  wherein each of said number of outlet ports are flared outwards.  
     
     
         14 . A gas burner as claimed in  claim 13  wherein each of said number of outlet ports are flared outwards at between 6 and 12 degrees.  
     
     
         14 . A gas burner substantially as described herein and with reference to and as illustrated by the accompanying drawings.