Gas burner
A gas burner ( 10 ) includes an internal cavity ( 20 ) for receiving a gas and air mixture and an external substantially cylindrical wall ( 16 ) surrounding the cavity ( 20 ). The wall ( 16 ) is provided with through holes ( 32 ) for allowing gases to pass from the cavity ( 20 ) to an exterior burner ( 10 ) for combustion. The wall ( 16 ) is made up of one or more wall elements ( 30 ) in the form of sheets of material shaped so that together they form a substantially cylindrical shape. The wall includes at least one join between adjacent edge portions ( 34 a , 34 b ) of the wall elements, the join being welded and at least the part of one edge portion ( 34 a ) overlying at least a part of the other edge portion ( 34 b ) in the region of the join.
1. A gas burner including:
an internal cavity for receiving a gas and air mixture; and
an external substantially cylindrical wall surrounding the cavity, the wall being provided with through hales for allowing gases to pass from the cavity to an exterior of the burner for combustion;
wherein the wall is made of one or more wall elements in the form of sheets of material shaped so that together the sheets of material form a substantially cylindrical shape, the wall including at least one join between adjacent edge portions of the wall element or wall elements, the join being non-welded, and wherein both of the adjacent edge portions include a plurality of tabs extending generally in the tangential direction of the substantially cylindrical wall, the tabs are spaced apart in the axial direction of the wall elements to define gaps between the tabs, the tabs of one edge portion being axially aligned with gaps defined between the tabs of the other edge portion and the tabs of edge portion overlying at least a part of the other edge portion in the region of the join.
2. A gas burner according to claim 1 , wherein the wall comprises two substantially semi-cylindrical wall elements, the join being formed between an edge portion of one wall element and an adjacent edge portion of the other wall element.
3. A gas burner according to claim 1 , wherein the tabs are radially offset relative to a main body of the wall element such that they are positioned inwardly or outwardly relative to the main body.
4. A gas burner according to claim 3 , wherein the tabs are offset by an amount substantially equal to the thickness of the wall such that they lie adjacent to the main body at the other edge portion, the axial length of the gaps between the tabs being substantially equal to the axial length of the tabs.
5. A gas burner according to claim 4 , wherein the tabs include orifices extending therethrough, the orifices being larger than the holes in the substantially cylindrical wall, and the frequency and spacing of the orifices being substantially equivalent to the frequency and spacing of the through holes.
6. A gas burner according to claim 5 , wherein the orifices in the tabs at one edge portion are substantially concentric with the through holes in the main body at the other edge portion.
7. A gas burner according to claim 6 , wherein the tabs have no sharp corners.
8. A gas burner according to claim 1 , wherein the through holes are arranged in axial rows, holes in adjacent axial rows being offset from one another.
9. A gas burner according to claim 1 , wherein the material of the substantially cylindrical wall is a heat resistant steel.
10. A method of manufacturing a gas burner including an internal cavity for receiving a gas and air mixture and an external substantially cylindrical wall surrounding the cavity, the method including the steps of providing one or more wall elements in the form of sheets of material shaped so that together the sheets of material form a substantially cylindrical shape, and creating a join between adjacent edge portions of the wall element or wall elements, the join being non-welded, wherein both edge portions are formed to include a plurality of tabs extending generally in the tangential direction of the substantially cylindrical wall, the tabs are spaced apart in the axial direction of the wall elements to define gaps between the tabs, the tabs of one edge portion being axially aligned with gaps defined between the tabs of the other edge portion and the tabs of each edge portion overlying at least a part of the other edge portion in the region of the join.
11. A method according to claim 10 , wherein the wall is formed with two substantially semi-cylindrical wall elements, the join being created between an edge portion of one wall element and an edge portion of the other wall element.
12. A method according to claim 10 , wherein tabs are formed such that they are offset in the radial direction relative to a main body of the wall elements, such that they are positioned radially inwardly or outwardly relative to the main body.
13. A method according to claim 12 , wherein the tabs are formed such that they are offset by an amount substantially equal to the thickness of the wall, such that they lie adjacent to the main body at the other edge portion, the axial lengths of the gaps between the tabs being substantially equal to the axial length of the tabs.