PREMIX GAS BURNER

Abstract

A premix gas burner (100) comprises a metal mounting plate (102) for mounting the premix gas burner in a heating appliance; a metal plate structure (104) and a burner deck (106). The burner deck comprises a woven wire mesh on the outer surface of which premix gas is combusted after the premix gas has flown through the woven wire mesh. The woven wire mesh comprises a circumferential edge (108). The circumferential edge comprises a plurality of tabs (110). The mounting plate comprises a central opening. The burner deck is inserted through the central opening. The metal mounting plate or the metal plate structure comprises at least one ridge (112). The at least one ridge comprises at least one notch (114). Each of the tabs is positioned in a notch. The metal mounting plate and the metal plate structure are in contact with each other at the top of the ridge, such that the open side of the at least one notch is covered; and such that the tabs are held in between the metal mounting plate and the metal plate structure with play being present of the tabs relative to the metal mounting plate and relative to the metal plate structure.

Claims

1. Premix gas burner comprising a metal mounting plate for mounting the premix gas burner in a heating appliance; a metal plate structure and a burner deck, wherein the burner deck comprises and preferably consists out of - a woven wire mesh on the outer surface of which premix gas is combusted after the premix gas has flown through the woven wire mesh; wherein the woven wire mesh comprises a circumferential edge; wherein the circumferential edge comprises a plurality of tabs, wherein the mounting plate comprises a central opening; wherein the burner deck is inserted through the central opening; wherein the metal mounting plate or the metal plate structure comprises at least one ridge; wherein the at least one ridge comprises at least one notch; wherein each of the tabs is positioned in a notch wherein the metal mounting plate and the metal plate structure are in contact with each other at the top of the ridge, such that the open side of the at least one notch is covered; and such that the tabs are held in between the metal mounting plate and the metal plate structure with play being present of the tabs relative to the metal mounting plate and relative to the metal plate structure.

2. Premix gas burner as in claim 1; wherein the play being present of the tabs relative to the metal mounting plate and relative to the metal plate structure is at least 0.4 mm.

3. Premix gas burner as in claim 1; wherein the at least one ridge is provided in the metal mounting plate, wherein the at least one ridge is provided at least partly around the central opening, wherein the at least one ridge extends towards a first side relative to the plane of the metal mounting plate; wherein the burner deck extends towards the other side of the plane of the metal mounting plate compared to the first side; wherein the metal plate structure covers the open side of the at least one notch such that the tabs are held in between the metal mounting plate and the metal plate structure with play being present of the tabs relative to the metal mounting plate and relative to the metal plate structure.

4. Premix gas burner as in claim 1; wherein the at least one ridge is provided in the metal plate structure; wherein the at least one ridge extends towards a first side relative to the plane of the metal plate structure where the at least one ridge is provided; wherein the burner deck extends through the central opening to the first side relative to the plane of the metal plate structure where the at least one ridge is provided; wherein the metal mounting plate covers the open side of the at least one notch such that the tabs are held in between the metal mounting plate and the metal plate structure with play being present of the tabs relative to the metal mounting plate and relative to the metal plate structure.

5. Premix gas burner as in claim 1, wherein the tabs are parallel with the plane of the metal mounting plate.

6. Premix gas burner as in claim 1, wherein the ridge surrounds the complete burner deck.

7. Premix gas burner as in claim 1, wherein the burner deck is provided in a convex shape.

8. Premix gas burner as in claim 1, wherein the circumference of the burner deck has the shape of a rectangle of which the two short sides have beenpreferably continuouslyrounded.

9. Premix gas burner as in claim 8, wherein tabs are only provided along the two long sides of the rectangular shape of the circumference of the burner deck.

10. Premix gas burner as in claim 1, wherein the burner comprises a perforated plate segment; wherein the perforated plate segment is provided for flow of premix gas through the perforations of the perforated plate segment before the premix gas flows through the woven wire mesh.

11. Premix gas burner as in claim 10; wherein the perforated plate segment is an integral part of the metal plate structure.

12. Premix gas burner as in claim 10; wherein the perforated plate segment and the metal plate structure are one single metal plate.

13. Premix gas burner as in claim 10, wherein all zones of the perforated plate segment provided with perforations are provided at a distance from the woven wire mesh.

14. Condensing boiler comprising a premix gas burner as in claim 1.

Description

BRIEF DESCRIPTION OF FIGURES IN THE DRAWINGS

[0026] FIG. 1 shows a premix gas burner according to the invention.

MODE(S) FOR CARRYING OUT THE INVENTION

[0027] FIG. 1 shows an exploded view of an example of a premix gas burner 100 according to the invention. The premix gas burner 100 comprises a metal mounting plate 102 for mounting the premix gas burner in a heating appliance; a metal plate structure 104 and a burner deck 106. The full surface of the burner deck has a convex shape. The burner deck consists out of a woven wire mesh on the outer surface of which premix gas is combusted after the premix gas has flown through the woven wire mesh. The woven wire mesh e.g. is 0.9 mm thick. The woven wire mesh comprises a circumferential edge 108. The circumferential edge comprises a plurality of tabs 110. The tabs are an integral part of the woven wire mesh. In the burner, the tabs are parallel with the mounting plate.

[0028] The mounting plate comprises a central opening. The burner deck is inserted through the central opening. The central opening is also provided for the supply of premix gas to the burner when the burner is in operation. The metal mounting plate 102 comprises a ridge 112. The ridge surrounds the complete burner deck. The ridge comprises a number of notches 114.

[0029] In the burner, each of the tabs 110 is positioned in a notch 114. In the burner, the metal mounting plate 102 and the metal plate structure 104 are in contact with each other at the top of the ridge, such that the open side of the at least one notch is covered; and such that the tabs are held in between the metal mounting plate and the metal plate structure with play being present of the tabs relative to the metal mounting plate and relative to the metal plate structure. In the burner, the metal plate structure can be e.g. be welded to the metal mounting plate at their contacting points. In the exemplary burner, the playwhich is the difference between the metal mounting plate and the metal plate structure from which the thickness of the woven wire mesh is subtractedis 0.6 mm.

[0030] The metal plate structure 104 comprises a plurality of perforations 116, provided for flow of premix gas through the perforations 116 before the premix gas flows through the woven wire mesh.

[0031] The circumference of the burner deck has the shape of a rectangle of which the two short sides have been continuously rounded. Tabs are only provided along the two long sides of the rectangular shape of the circumference of the burner deck. No tabs are provided along the continuously rounded short sides.

[0032] As an alternative to providing the ridge (and the notches in the ridge) in the metal mounting plate, the ridges (and the notches in the ridge) can be provided in the metal plate structure. The remainder of the burner can be the same as in the example of FIG. 1.