阅读说明：本技术 预混合气体燃烧器 (Premix gas burner ) 是由 R·范祖特费恩特 G·福克斯 D·霍尔特洛普 R·博尔 D·欧斯特拉 H·霍尔萨普尔 于 2018-07-04 设计创作，主要内容包括：预混合气体燃烧器(100)包括用于将预混合气体燃烧器安装在加热器具中的金属安装板(102)、金属板结构(104)和燃烧器平台(106)。燃烧器平台包括机织丝网，在预混合气体已经流过机织丝网之后，预混合气体在该机织丝网的外表面上被燃烧。机织丝网包括周向边缘(108)。周向边缘包括多个凸片(110)。安装板包括中心开口。燃烧器平台通过中心开口被插入。金属安装板或金属板结构包括至少一个脊(112)。至少一个脊包括至少一个缺口(114)。各凸片被定位在缺口中。金属安装板和金属板结构在脊的顶部处彼此接触，使得至少一个缺口的开口侧被覆盖；以及使得凸片被保持在金属安装板和金属板结构之间，凸片相对于金属安装板和相对于金属板结构存在游隙。(The premix gas burner (100) comprises a metal mounting plate (102), a metal plate structure (104) and a burner platform (106) for mounting the premix gas burner in a heating appliance. The burner deck includes a woven wire mesh over the outer surface of which the premixed gas is combusted after it has flowed through the woven wire mesh. The woven screen includes a circumferential edge (108). The circumferential edge includes a plurality of tabs (110). The mounting plate includes a central opening. The burner deck is inserted through the central opening. The metal mounting plate or metal plate structure includes at least one ridge (112). The at least one ridge includes at least one notch (114). Each tab is positioned in the notch. The metal mounting plate and the metal plate structure contact each other at a top of the ridge such that an open side of the at least one indentation is covered; and such that the tab is retained between the metal mounting plate and the metal plate structure, the tab having play relative to the metal mounting plate and relative to the metal plate structure.)

1. A premixed gas burner comprising:

a metal mounting plate for mounting the premix gas burner in a heating appliance,

-a metal sheet structure, and

-a burner deck for the gas turbine,

wherein the burner deck comprises, and preferably consists of, a woven wire mesh over the outer surface of which the premixed gas is combusted after it has flowed 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 includes 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 contact each other at the top of the ridge such that an open side of the at least one indentation is covered; and

such that the tab is retained between the metal mounting plate and the metal plate structure with play relative to the metal mounting plate and relative to the metal plate structure.

2. The premix gas burner as in claim 1, wherein said play of said tabs existing with respect to said metal mounting plate and with respect to said metal plate structure is at least 0.4 mm.

3. The premix gas burner as in any of claims 1 to 2,

wherein the at least one ridge is disposed in the metal mounting plate,

wherein the at least one ridge is disposed at least partially around the central opening;

wherein the at least one ridge extends toward the first side relative to a plane of the metal mounting plate;

wherein the burner deck extends toward the other side of the plane of the metal mounting plate than the first side;

wherein the metal plate structure covers the open side of the at least one indentation such that the tab is retained between the metal mounting plate and the metal plate structure, the tab having play relative to the metal mounting plate and relative to the metal plate structure.

4. The premix gas burner as in any of claims 1 to 2,

wherein the at least one ridge is provided in the metal plate structure;

wherein the at least one ridge extends towards the first side relative to a plane of the metal plate structure in which the at least one ridge is disposed;

wherein the burner deck extends through the central opening toward the first side relative to the plane of the metal plate structure in which the at least one ridge is disposed;

wherein the metal mounting plate covers the open side of the at least one indentation such that the tab is retained between the metal mounting plate and the metal plate structure, the tab having play relative to the metal mounting plate and relative to the metal plate structure.

5. The premix gas burner as in any of the preceding claims, wherein the tabs are parallel to the plane of the metal mounting plate.

6. The premix gas burner as in any of the preceding claims, wherein the ridge surrounds the entire burner deck.

7. The premix gas burner as in any of the preceding claims, wherein said burner deck is provided in a convex shape.

8. The premix gas burner as in any of the preceding claims, wherein the periphery of the burner deck has a rectangular shape, wherein the two short sides are rounded, preferably continuously rounded.

9. The premix gas burner of claim 8, wherein tabs are provided only along two long sides of the rectangular shape of the perimeter of the burner deck.

10. The premix gas burner as in any of the preceding claims, wherein said burner comprises a perforated plate section; wherein the perforated plate section is configured to flow premixed gas through perforations of the perforated plate section prior to the premixed gas flowing through the woven wire mesh.

11. The premixed gas burner of claim 10, wherein the perforated plate segment is an integral part of the metal plate structure.

12. The premixed gas burner of claim 10 or 11, wherein the perforated plate section and the metal plate structure are one single metal plate.

13. The premix gas burner as in any of claims 10 to 12, wherein all areas of said perforated plate section provided with perforations are provided at a distance from said woven wire mesh.

14. Condensation boiler comprising a premix gas burner according to any of claims 1 to 13.

Technical Field

The present invention relates to the field of premixed gas burners, more particularly to surface stabilized premixed gas burners comprising a woven wire mesh as the burner platform.

Background

Surface-stabilized premix gas burners with woven wire burner platforms are known.

US5474443A discloses a premix gas burner with a hemispherical burner deck made of woven wire mesh.

US2005/172915 shows a premix gas burner with a woven wire mesh combustion surface comprising rigid ribs.

Disclosure of Invention

A first aspect of the invention is a premix gas burner comprising a metal mounting plate, a metal plate structure and a burner deck for mounting the premix gas burner in a heating appliance. The burner deck comprises and preferably consists of a woven wire mesh over the outer surface of which the premixed gas is combusted after it has flowed through the woven wire mesh. The woven wire mesh includes a circumferential edge. The circumferential edge includes a plurality of tabs. The mounting plate includes a central opening. The burner deck is inserted through the central opening. The metal mounting plate or metal plate structure includes at least one ridge. The at least one ridge includes at least one notch. Each tab is positioned in the notch. The metal mounting plate and the metal plate structure contact each other at a top of the ridge such that an open side of the at least one indentation is covered; and such that the tab is retained between the metal mounting plate and the metal plate structure, the tab having play relative to the metal mounting plate and relative to the metal plate structure.

Woven wire mesh burner platforms of surface stabilized premixed gas burners become hot when the burner is in use. Woven wire mesh combustor platforms need to be able to handle the stresses caused by thermal expansion associated with high temperatures when the combustor is in use and the stresses caused by shrinkage when the combustor is not in use. If this is not the case, early mechanical failure of the combustor platform may occur. Due to the provision of play of the at least one tab relative to the metal mounting plate and relative to the metal plate structure, a certain amount of movement of the woven wire mesh relative to the mounting metal plate and the metal plate structure is possible when the woven wire mesh expands upon heating or contracts upon cooling. It is therefore surprising that the premix gas burner of the invention is very well adapted to withstand thermal expansion and contraction, resulting in a long life of the premix gas burner.

Preferably, the tab comprises or is made from a woven wire mesh. More preferably, the tab is an integral part of the woven wire mesh.

The metal plate structure may be, for example, welded to a metal mounting plate.

Preferably, in operation of the burner, the premixed gas is fed to the burner deck through the central opening.

The preferred tab has a substantially rectangular shape. Preferred tabs have a width of between 4mm and 32 mm; more preferably between 6mm and 20 mm.

Preferred tabs have a height of between 1mm and 12 mm; more preferably between 3mm and 6 mm.

Preferred tabs have a maximum width of between 4mm and 32 mm; more preferably less than 20 mm; more preferably between 6mm and 20 mm. Preferred tabs have a maximum height of between 3mm and 6 mm.

Preferably, the woven wire mesh has a thickness between 0.6mm and 1.3 mm. As an example, a woven wire mesh of 0.9mm thickness may be advantageously used in the present invention.

In a preferred embodiment, the woven wire mesh comprises neither ribs nor protrusions.

In a preferred embodiment, the woven wire mesh comprises ribs and/or protrusions.

Preferably, the tab presents a play of at least 0.4mm with respect to the metal mounting plate and with respect to the metal plate structure. More preferably, the play is between 0.4mm and 1 mm; even more preferably, the play is between 0.5 and 0.8 mm. Play refers to the difference between the metal mounting plate and the metal plate structure, then minus the thickness of the woven wire mesh.

In a preferred premix gas burner, at least one ridge is provided in the metal mounting plate. At least one ridge is disposed at least partially around the central opening. At least one ridge extends toward the first side relative to a plane of the metal mounting plate. The burner deck extends towards the other side of the plane of the metal mounting plate than the first side. The metal plate structure covers the open side of the at least one indentation such that the tab is retained between the metal mounting plate and the metal plate structure, the tab having play relative to the metal mounting plate and relative to the metal plate structure.

In a preferred premix gas burner, at least one ridge is provided in the metal plate structure. The at least one ridge extends towards the first side relative to a plane of the metal plate structure in which the at least one ridge is arranged. The burner deck extends through the central opening to the first side relative to a plane of the metal plate structure in which the at least one ridge is provided. The metal mounting plate covers the open side of the at least one indentation such that the tab is retained between the metal mounting plate and the metal plate structure, the tab having play relative to the metal mounting plate and relative to the metal plate structure.

Preferably, the tabs are parallel to the plane of the metal mounting plate.

Preferably, the ridge surrounds the entire burner deck.

In a preferred embodiment, the burner deck is arranged in a convex shape. This means that the flame of the burner is anchored on the convex side of the burner deck when the burner is in operation. More preferably, the entire surface of the burner deck is provided in a convex shape; meaning that the entire surface of the burner deck on the side where the flame is anchored has a convex shape when the burner is in operation.

In a preferred embodiment, the periphery of the burner deck has a rectangular shape, wherein the two short sides are rounded. More preferably, the short sides of the rectangle are continuously rounded. In embodiments where the periphery of the burner deck has a rectangular shape, wherein the two short sides are (preferably continuously) rounded, the tabs are preferably provided only along the two long sides of the rectangular shape of the periphery of the burner deck. Meaning that no tab is provided along the short side, which may be continuously rounded. The burner according to this embodiment is even better suited for long life use, since the absence of tabs along the short sides allows for better thermal expansion of the woven wire in its length direction. Furthermore, such a burner can be manufactured more easily.

Preferably, the burner comprises a perforated plate section for flowing the premixed gas through perforations of the perforated plate section before flowing the premixed gas through the woven wire mesh. More preferably, the perforated plate section is an integral part of the metal plate structure. Even more preferably, the perforated plate section and the metal plate structure are one single metal plate. Perforated plate segments are provided to properly distribute the premixed gas to the woven wire mesh combustor platform.

In an embodiment, wherein the burner comprises a perforated plate section arranged for flowing the premixed gas through perforations of the perforated plate section before flowing the premixed gas through the woven wire, all areas of the perforated plate section provided with perforations are arranged at a distance from the woven wire. This means that no perforation is in contact with the woven wire, but the perforation is positioned at a distance from the woven wire.

A second aspect of the invention is a condensing boiler comprising a premix gas burner as described in any embodiment of the first aspect of the invention. Preferably, the condensing boiler comprises a cast aluminium heat exchanger.

Drawings

Fig. 1 shows a premix gas burner according to the invention.

Detailed Description

Fig. 1 shows an exploded view of an example of a premix gas burner 100 according to the invention. The premixed gas burner 100 includes: a metal mounting plate 102 for mounting the premixed gas burner in the heating apparatus; a metal plate structure 104 and a burner deck 106. The entire surface of the burner deck has a convex shape. The burner deck consists of a woven wire mesh over the outer surface of which the premixed gas is burned after it has flowed through the woven wire mesh. For example, the woven wire mesh has a thickness of 0.9 mm. The woven screen includes a peripheral edge 108. The circumferential edge includes a plurality of tabs 110. The tab is an integral part of the woven wire mesh. In the burner, the tabs are parallel to the mounting plate.

The mounting plate includes a central opening. The burner deck is inserted through the central opening. The central opening is also configured to supply premixed gas to the combustor when the combustor is operating. The metal mounting plate 102 includes a ridge 112. The ridges surround the complete burner deck. The ridge includes a plurality of notches 114.

In the burner, each tab 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 on top of the ridge such that the open side of the at least one indentation is covered; and such that the tab is retained between the metal mounting plate and the metal plate structure with play relative to the metal mounting plate and relative to the metal plate structure. In a burner, the metal plate structure may be, for example, welded to a metal mounting plate at its contact points. In the exemplary burner, the play, which is the difference between the metal mounting plate and the metal plate structure and then the thickness of the woven wire mesh is subtracted, is 0.6 mm.

The metal plate structure 104 includes a plurality of perforations 116 configured to flow the premix gas through the perforations 116 before the premix gas flows through the woven wire mesh.

The periphery of the burner deck has a rectangular shape, the two short sides of which are continuously rounded. The tabs are only provided along the two long sides of the rectangular shape of the perimeter of the burner deck. No tabs are provided along the continuously rounded short sides.

As an alternative to providing a ridge (and a notch in the ridge) in the metal mounting plate, a ridge (and a notch in the ridge) may be provided in the metal plate structure. The remainder of the combustor may be the same as in the example of fig. 1.