WO2002016831A1

WO2002016831A1 - Gas radiant burner

Info

Publication number: WO2002016831A1
Application number: PCT/EP2001/009426
Authority: WO
Inventors: Michael Kahlke; Rüdiger Stern; Alexander Groehl
Original assignee: Schott Glas; Carl-Zeiss-Stiftung Trading As Schott Glas; Carl-Zeiss-Stiftung
Priority date: 2000-08-24
Filing date: 2001-08-16
Publication date: 2002-02-28
Also published as: AU2001295464A1; DE10041472C1

Abstract

Gas radiant burners, in particular, in a glass ceramic smooth top each comprise a mixer tube, a mixing chamber, and a burner plate, which is held on each base metal sheet, whereby the burner plates vary in size. In order to avoid having to match the size of the mixing chamber to each size of the gas radiant burners, the gas radiant burners (1) comprise identically designed base burners (2). The different sized burner plates (5) are supported by a base metal sheet (4) in an interspaced manner. An adaptation collar (3) is placed between the mixing chamber (8) and the respective base metal sheet (4).

Description

description

Gas radiant burner

The invention relates to gas radiation burners according to the preamble of claim 1.

Radiant gas burners are used in particular on glass ceramic cooktops with several cooking zones. Under each cooking zone there is a burner plate corresponding to its size, below which there is a gas-air mixing chamber. The combustion gases are discharged laterally between the glass ceramic cooktop and the burner plate. Such gas radiation burners are described in DE 195 45 842 CI and DE 196 37 666 AI and EP 0 638 771 Bl.

Depending on the different sizes of the cooking zones, different gas burners are used in terms of size and performance. According to the prior art, the burners have mixing chambers and mixing tubes of different sizes. The mixing chambers are formed by sheet metal pots, which are manufactured with tools by pressing, pressing or deep drawing. Accordingly, for the required torch sizes can be provided for each own tool, which increases tool costs and complicates logistics and assembly.

The burner plate consists of a high-temperature-resistant, highly porous material, on the surface of which burns a flame carpet that heats up the burning surface so high that it radiates and radiates the radiant heat to the cooking zone. The burner plate can consist of a perforated ceramic material. Such a burner plate I described, for example, in DE 198 47 042 AI.

The object of the invention is to simplify the structure of gas radiation burners of the type mentioned at the outset in such a way that an adapted mixing chamber size is not necessary for each burner plate size.

According to the invention, the above object is achieved by the features of the characterizing part of claim 1.

This ensures that the same basic burner can be used for the differently sized burner plates. It is therefore not necessary to manufacture, keep ready and assemble different mixing chambers and mixing tubes. This leads to a reduction in the components combined with a reduction in tool costs and simplification of the logistics. This also simplifies assembly.

The structure described is compact, which facilitates the adaptation to different desired cooking zone designs of the glass ceramic cooking surface. The size of the base burner is preferably adapted to the smallest burner plate provided.

In an embodiment of the invention, the gas-air mixture outlet from the mixing chamber takes up an approximately circular area on. Using an appropriately shaped

Adaptation collar is an adaptation of the gas-air mixture flow to a larger or smaller or differently shaped, for example oval or angular, burner plate. In the room at the bottom of that

Gas-air mixture outlet and is limited at the top by the burner plate and laterally by the adapter collar, the gas-air mixture is distributed over the burner plate.

The gas-air mixture outlet and the burner plate do not have to be concentric with one another. If an eccentric structure is desired for structural reasons, a largely uniform gas / air mixture can nevertheless be applied to the burner plate by means of an appropriately shaped adjustment collar.

Due to the variety of possible shapes, the burner can also be used in applications that are not in the cooking area, for example in boilers, fireplace inserts, ceiling spotlights, process heating ovens, etc.

Further advantageous embodiments of the invention result from the subclaims and the following description. The drawing shows schematically:

FIG. 1 shows a gas radiation burner in supervision,

FIG. 2 shows the gas radiation burner in a side view,

3a shows the base burner of the gas radiation burner in side view and

FIG. 3b, its bottom view,

4 shows the basic burner according to FIG. 3a with a larger burner plate and Figure 5 is a plan view of three differently sized gas radiation burners under a hotplate.

A gas radiation burner 1 has a base burner 2, an adaptation collar 3, a burner plate 5 held on a base plate 4 and an exhaust gas duct 6.

The base burner 2 consists of a mixing tube 7 which opens into a mixing chamber 8. Fuel gas is introduced into the mixing tube 7 via a nozzle 9, which draws in ambient air via an air adjustment element 10. The gas-air mixture leaves the mixing chamber 8 at an essentially circular gas-air mixture outlet 11 and is guided by means of a spiral guide plate 25, the disturbance being evened out and slowed down. The mixing chamber is covered by a perforated distribution plate 12. At a distance a from (see FIGS. 3a, 4) the distribution plate 12, the flat burner plate 5 is arranged approximately parallel to the latter. The clearance between the distribution plate 12 and the burner plate 5 is closed laterally by the adjustment collar 3. The adjustment collar 3 and the base plate 4 consist of a metal plate. The mixing chamber 8 and the distribution plate 12 are individual parts. The burner plate 5 lies at its edge on a step 13 of the base plate 4 and is held thereon by means of a retaining ring 14 or other holding elements. The retaining ring 14 or the other element can be part of the base plate 4 or separate individual parts.

The burner plate 5 consists of a highly porous, temperature-resistant material. For example, it is a perforated ceramic plate or a ceramic fiber mat, as is known on the market under the Schott Ceramat brand. Such a ceramic fiber mat consists of a self-supporting, coated, perforated fleece made of ceramic fibers. The burner plate 5, when embodied as a ceramic fiber mat, has, for example, a perforation with a hole diameter of approximately 1.4 mm and a hole spacing of 2.8 mm in approximately 60 staggered rows. The burner plate 5 can be circular, oval or angular.

A component 15 which forms the exhaust gas duct 6 and which partially surrounds the burner plate 5 and is open to the exhaust duct 6 is seated on the base plate 4. The component 15 consists of a microporous thermal insulation material, for example of vermiculite or a mixture of vermiculite and ceramic fiber material, or generally of ceramic fiber material.

The upper edge 16 of the component 15 facing away from the burner plate 5 is intended for attachment or pressing under a glass ceramic hotplate 17. A sealing cord can be provided between the upper edge 16 of the component 15 and the glass ceramic hotplate 17.

An integrated component 18 is provided for electrical ignition, ignition protection, temperature limitation and as residual heat contact, which combines these functions. The component 18 consists of a commercially available protective temperature limiter, on which an ignition head is attached. The flame is monitored by means of an ionization electrode 18 'of the component 18, which is formed by the core of the safety temperature limiter. The component 18 is screwed to the base plate 4 in an electrically insulated manner by means of a holding plate 19. The ionization signal is taken from the holding plate 12. The component 18 is inserted through an opening 20 in the component 15 into the space between the burner plate 5 and the glass ceramic hotplate 17. Several openings 20 are for different positions of the component 18 is provided. The openings 20 that are not required are closed by means of plugs (see FIG. 1), or are not drilled at all.

According to Figure 4, the collar 3 is integrally formed on the base plate 4 itself. It is therefore not necessary to have a separate component for the design of the adjustment collar 3. An edge 21 in which the mixing chamber 8 with its distribution plate 12 can be inserted can be angled on the adaptation collar 3. The adaptation collar 3 passes from the circumference of the gas-air mixture outlet 11 or the distribution plate 12 into the circumference of the burner plate 5, the gas-air mixture flow leaving the distribution plate 12 expanding to the burner plate 5 largely uniformly (cf. arrows G) and thus the burner plate 5 is largely uniformly applied over its essential surface, so that a largely uniform carpet of flame is formed on its side facing away from the distribution plate 12.

The adapter collar 3 is connected to the mixing chamber 8 in a gas-tight manner, for example by brazing, welding or gluing. A sealing material can also be provided on the joint between the adaptation collar 3 and the mixing chamber 8, wherein the adaptation collar 3 can be connected to the mixing chamber 8 by screws. The base plate 4 is the supporting component of the gas radiation burner 1. The base burner 2 hangs on it.

In another embodiment, the adaptation collar 3 can be formed in one piece with the mixing chamber 8 or the distribution plate 12. The conically widening adjustment collar 3 is then cut off depending on the diameter of the respective burner plate 5. With different burner plate diameters, there are different distances a due to the geometry.

5 shows three gas radiation burners 1 ', 1 ^{, I} , 1 ^{, I,} shown under a ceramic hob 17. The burner plate 5 of the gas radiation burner 1 'has a smallest diameter Dl of approximately 145 mm, corresponding to the cooking zone of the glass ceramic hotplate 17 assigned to it and not flared as in Figure 4.

In the case of the gas radiation burner ¹ ' ¹ , the burner plate 5 has the diameter D2, for example 180 mm, corresponding to the assigned cooking zone of the glass ceramic hotplate 17. The burner plate 5 of the gas radiant burner l ^{^1, 1} 'accordingly has its associated cooking zone of the glass ceramic cooking plate 17 the diameter D3, where Dl <D2 <D3. The diameter D3 is approximately 210 mm. The base burner 2 of the gas radiation burner 1 ″ and ¹¹ ′ are the same size as the base burner 2 of the gas radiation burner 1 ′. The diameters of their distribution plates 12 are therefore the same. The respective adjustment collar serves 3. The adjustment collar 3 of the gas radiant burner l to adapt to the diameters D2 and D3 ¹ 'accordingly has a smaller angle of taper than the adjustment collar 3 of the gas radiant burner 1''' when the same spacing a in the radiant gas burners 1 '' and l ¹ ' ^{1 is} desired. If the same distance a is not important, the adjustment collar 3 can be used for both

Gas radiation burners 1 ″ and ¹¹ ′ have the same conical angle, the distance a then changing accordingly.

With the arrangement described, it is possible to achieve the same specific burner output (W / cm) for the different sizes of the burner plates 5 of the gas radiation burners 1 ', 1 ^, ', 1 '''. For this purpose, only the nozzle 9 and / or the air adjustment element 10 need to be adapted accordingly. A change in Base burner 2 is not required.

Since the exhaust gas duct 6 should open into a common exhaust duct 22, the gas radiation burner l ¹ ,! ¹¹ ,! ^111, however, are arranged at different points under the glass ceramic hotplate 17 and the exhaust gas guide channels 6 are to be designed in a similar manner, extension elements 23, 24 are provided with which the exhaust gases from the exhaust gas guide channels 6 can be conducted into the exhaust gas guide shaft 22.

Claims

Claims radiant gas burner

1. gas radiation burner, in particular for a glass ceramic cooktop, each with a mixing tube, and each with a mixing chamber and with a burner plate each held on a base plate, the burner plates being of different sizes, characterized in that the gas radiation burner (1, 1 ', 1 '', 1 '' ') an identically designed basic burner (2) with the same mixing tube

(7) and the same mixing chamber (8) have that the differently sized burner plates (5) are carried at a distance from the respective gas-air mixture outlet (11) of the respective mixing chamber (8) from the base plate (4) and that between the Mixing chamber (8) and the base plate (4) revolves around an adjustment collar (3) extending from the circumference of the gas-air mixture outlet (11) of the mixing chamber

(8) passes into the scope of the respective burner plate (5).

2. Gas radiation burner according to claim 1, characterized in that the size of the base burner (2) corresponds approximately to the smallest burner plate provided (5).

3. Gas radiation burner according to claim 1 or 2, characterized in that the gas-air mixture outlet (11) of the mixing chamber (8) occupies an approximately circular area and the respective burner plate (5) is circular, oval, or angularly larger or smaller.

4. Gas radiation burner according to one of the preceding claims, characterized in that the burner plate (5) is larger than the gas-air mixture outlet (II) of the mixing chamber (8), the adaptation collar (3) being conical from the gas-air mixture outlet (11) extended to the burner plate (5).

5. Gas radiation burner according to one of the preceding claims, characterized in that the burner plate (5) is the same size as the gas-air mixture outlet (11) of the mixing chamber (8), the adaptation collar (3) being cylindrical from the gas-air mixture -Exit (11) extends to the burner plate (5).

6. Gas radiation burner according to one of the preceding claims, characterized in that a spiral guide plate (25) is arranged in the mixing chamber (8) in order to even out and / or slow the flow.

7. Gas radiation burner according to one of the preceding claims, characterized in that at the gas-air mixture outlet (11) of the mixing chamber

(8) a distribution plate (12) is arranged.

8. Gas radiation burner according to one of the preceding claims, characterized in that the respective adaptation collar (3) is integrally formed on the respective base plate (4).

9. Gas radiation burner according to one of the preceding Claims 1 to 7, characterized in that the respective adjustment collar (3) is a separate component from the respective base plate (4).

10. Gas radiation burner according to claim 9, characterized in that the adaptation collar (3) is part of the mixing chamber (8).

11. Gas radiation burner according to one of the preceding claims, characterized in that the same specific burner output can be set on the different large burner plates (5) by means of a nozzle (9) and / or air adjustment element (10) arranged in front of the mixing tube (7).