DE102021002920A1 - Transportable oven with a combined combustion chamber and cooking or baking or grilling chamber for the thermal preparation of foodstuffs and method for assembling and disassembling such an oven and gas burner for heating such an oven - Google Patents

Abstract

A transportable oven with a combined fire and cooking or baking or grilling area for the thermal preparation of food is presented, which requires only short heating times and which can be loaded and transported away immediately after use in a space-saving and robust manner. The furnace (1) can be assembled without tools from rectangular, plate-shaped surface elements (2, 3, 4, 5) with an insulating layer (16) and a refractory, mineral heat storage layer to form a cuboid furnace body and dismantled again. It has at least one floor panel element (2), several vertical side panel elements (3), at least one of which is designed as a front panel element (4) with a loading opening (8), and at least one top panel element (5) on, wherein the surface elements consist of flat, trough-shaped folded sheet metal base bodies (12, 13, 14, 15), in each of which the insulating layer (16) and the refractory mineral heat storage layer designed as a flat heat storage plate (17) are accommodated, with at least the sheet metal base body (12) of the at least one floor panel element (2) and the sheet metal base bodies (14, 15) of the side panel elements (3) and of the at least one front panel element (4) on vertical stand elements arranged on the ends (6, 7) are detachably attached.Methods for assembling and disassembling such a furnace (1) and a gas burner for heating such a furnace (1) are also presented.

Description

The invention relates to a transportable oven with a combined fire and cooking or baking or grilling space for the thermal preparation of food.
The invention also relates to methods of assembling and disassembling such a furnace and a gas burner for heating such a furnace.

A portable oven according to the preamble of claim 1 is from DE 10 2013 010 377 A1 known. The furnace presented there consists of a furnace base plate and a dome-shaped furnace body made of refractory, mineral mass--in the preferred embodiment that has come into practical use. It can only be inferred from the document in general terms that the known furnace is also composed of rectangular planar elements to form a cuboid and that an insulating layer is provided on the outside of the furnace body in addition to the refractory, mineral mass. Furnace floor plate and furnace body are composed of several individual segments that are only loosely assembled. As a result, the oven can be easily disassembled after use, taken to another location and reassembled there.

In order to achieve sufficient strength and stability of the spherical components of the dome-shaped furnace body, however, they must be designed with relatively thick walls. Because of the resulting high mass, the oven requires long heating-up and cooling-down times, which is particularly disadvantageous in mobile commercial use, e.g. at folk festivals or catering: Because of the long heating-up time, you have to arrive early, after the oven has been used it has to be longer Allow time to cool before personnel can handle, disassemble, load and transport it.
However, it is also not possible to transport the furnace in the assembled state in order to avoid wasting time, since the individual segments are only loosely assembled and are therefore not stable for transport.

Furthermore, the stowage of the individual segments of the furnace for transport is expensive, since this must be done extremely conscientiously in order to protect all of the mineral mass, shock, impact, and pressure-sensitive parts, in particular the spherical individual segments of the dome-shaped furnace body, from mechanical overload such as breakage , edge chipping, etc., to protect. Finally, the stowage of the spherical individual segments of the dome-shaped furnace body requires a large volume.
Ultimately, since the known furnace in the preferred embodiment that has come into practical use is made solely of refractory, mineral mass, it is also sensitive to moisture. It therefore needs to be set up and stored away from moisture.

In addition to the usual solid heating with wood or charcoal, fluid heating is also disclosed for heating the well-known furnace, e.g. by means of a circular gas or oil burner permanently installed in the furnace chamber with burner nozzles pointing in unchangeable directions, so that even only unchangeable areas of the furnace interior can be heated in a targeted manner can be heated. However, it would be desirable to be able to heat the stove in different areas in a targeted manner during different phases of use.

From the DE 933 888 B it is known to provide permanently installed gas burners of baking or roasting tubes by means of eccentric linkage of a linkage to a rotatable disk in such a way that the burner flames are aligned so that they either generate top heat or bottom heat.

It is the object of the invention to create a transportable oven with a combined firebox and cooking or baking or grilling chamber for the thermal preparation of food and to specify its assembly and disassembly, which does not have the disadvantages mentioned, i.e. which only requires short heating-up times, can be loaded and transported away immediately after use in a space-saving and robust manner, and which is insensitive to the effects of the weather.

Another object of the invention is to specify a mobile gas burner that is easy to bring in and remove for a transportable oven with a combined firebox and cooking or baking or grilling chamber for the thermal preparation of food, the position and burner nozzle orientation of which can be easily varied.

The object is solved by an oven having the features of claim 1 and by methods for its assembly and disassembly according to the features of claims 13, 14 and 15. The further object is solved by a gas burner according to the features of claim 11.

Due to the fact that vertical stand elements are provided according to the main claim, to which the sheet metal base body of the floor panel element and the sheet metal base bodies of the side panel elements are detachably attached at the ends, the result is - even if the connections are detachable - a stable cuboid furnace which to the Transport does not necessarily have to be disassembled, but can also be worn and transported in the assembled state. The furnace has no solid joints, adhesives or linings.

The arrangement of an insulating layer between the refractory mineral heat storage layer (heat storage plate) and sheet metal base prevents excessive heating of the sheet metal base, so that the furnace can be touched for transport or disassembly, even if the heat storage plates are still hot.
The surface elements are structurally designed in such a way that when the stove is assembled, the heat storage plates meet directly without a gap, so that the sheet metal base body does not come into contact with hot combustion gases and can therefore heat up less.

Since the surface elements each consist of a flat, trough-shaped folded sheet metal base body, in which the insulating layer and the refractory mineral heat storage layer designed as a flat heat storage plate are accommodated, there are no spherical components, so that the surface elements can be space-saving as a whole after dismantling the furnace and relatively insensitive to mechanical damage can be stored flat on top of each other.

Due to the inventive design of the refractory mineral heat storage layer as flat heat storage plates supported by sheet metal base bodies, these can be designed with smaller wall thicknesses compared to spherical components, which - because of the lower mass - reduce heating and cooling times and at the same time make it easier to carry the assembled furnace becomes.

Due to the fact that the furnace according to the invention is composed of surface elements with outer metal sheet base bodies and is covered at the top by the metal sheet base body of the ceiling surface element, the moisture-sensitive parts: insulating layer and refractory mineral heat storage layer are protected from the weather, so that it is possible to use the furnace set up and leave outside without further weather protection without risk of damage or destruction.

Advantageous configurations and developments of the oven according to claim 1 are characterized in claims 2 to 10 and 12.

Further features, details and advantages of the invention can be seen from the following description of the exemplary embodiment with the aid of a drawing.

• 1: Eine perspektivische Ansicht des zusammengebauten Ofens 1 in seiner Grundform;
• 2: Eine Explosionszeichnung des Ofens 1 nach 1;
• 3 Eine perspektivische Detaildarstellung der Seiten- und Ecken-Ausbildung des Metallblech-Grundkörpers 12 des Boden-Flächenelements 2 samt zugeordneten unteren Ständerelementen 6;
• 4: Eine perspektivische Ansicht eines oberen Ständerelements 7;
• 5: Eine perspektivische Ansicht eines Seiten-Flächenelements 3;
• 6: Eine teilweise Schnittansicht des zusammengebauten Ofens 1 entlang der durch die Schnittlinien A - A und B - B in 1 aufgespannten Ebene;
• 7: Eine Schnittansicht des zusammengebauten Ofens 1 entlang der durch die Schnittlinien C - C und D - D in 1 aufgespannten Ebene mit Darstellung der Luft- und Rauchgasführung;
• 8: eine perspektivische Ansicht des zusammengebauten Ofens 1 in einer vorteilhaften Weiterbildung mit einer Kochplatte 36;
• 9: eine Seiten-Teilansicht des zusammengebauten Ofens (1) im Bereich der Beschickungsöffnung 8 in einer vorteilhaften Weiterbildung mit Ofentüre 57;
• 10: eine perspektivische Ansicht des zusammengebauten Ofens 1 in einer vorteilhaften Weiterbildung mit abklappbarem Front-Flächenelement 4;
• 11: eine perspektivische Ansicht eines Gasbrenners 49;
• 12: eine Draufsicht der Anordnung des Gasbrenners 49 im Ofenraum beim Aufheizen;
• 13: eine Draufsicht der Anordnung des Gasbrenners 49 im Ofenraum bei Erhaltungs-Heizung;
• 14: eine perspektivische Ansicht des zusammengebauten Ofens 1 in einer vorteilhaften Weiterbildung mit seitlicher Erweiterung;
• 15: eine perspektivische Detail-Ansicht der Anbindung der seitlichen Erweiterung nach 14;
• 16: eine perspektivische Ansicht des zusammengebauten Ofens 1 in einer vorteilhaften Weiterbildung mit Erweiterung nach hinten;
• 17: eine perspektivische Ansicht des zusammengebauten Ofens 1 in einer vorteilhaften Weiterbildung mit Erweiterung nach oben;

Show it:

• 1 1: A perspective view of the assembled oven 1 in its basic form;
• 2 : An exploded view of the furnace 1 after 1 ;
• 3 A detailed perspective view of the side and corner design of the sheet metal base body 12 of the floor surface element 2 together with the associated lower stand elements 6;
• 4 : A perspective view of an upper stand member 7;
• 5 : A perspective view of a side panel 3;
• 6 : A partially sectional view of the assembled oven 1 along the lines A - A and B - B in Fig 1 spanned plane;
• 7 : A sectional view of the assembled oven 1 taken along the lines C - C and D - D in 1 spanned plane showing the air and flue gas routing;
• 8th 1: a perspective view of the assembled oven 1 in an advantageous development with a cooking plate 36;
• 9 : a partial side view of the assembled oven (1) in the area of the loading opening 8 in an advantageous further development with oven door 57;
• 10 1: a perspective view of the assembled oven 1 in an advantageous further development with a foldable front surface element 4;
• 11 : a perspective view of a gas burner 49;
• 12 1: a plan view of the arrangement of the gas burner 49 in the furnace space during heating;
• 13 1: a plan view of the arrangement of the gas burner 49 in the furnace space with maintenance heating;
• 14 1: a perspective view of the assembled furnace 1 in an advantageous further development with lateral expansion;
• 15 : a perspective detail view of the connection of the lateral extension 14 ;
• 16 1: a perspective view of the assembled oven 1 in an advantageous further development with extension to the rear;
• 17 1: a perspective view of the assembled oven 1 in an advantageous further development with expansion upwards;

A basic version of the portable furnace 1 according to the invention is in the 1 until 7 shown, in order to simplify the illustration, identical components occurring several times are usually provided only once with reference symbols.

The furnace 1 consists essentially of six rectangular planar elements 2, 3, 4, 5 and four vertical stand elements 6, 7 at the corners, see 1 . Each surface element 2, 3, 4, 5 is made up of a sheet metal base body 12, 13, 14, 15, in which an insulating layer 16 and a heat storage plate 17 are introduced, cf. 2 , whereby for better visibility in 2 the insulating layers 16 are shown with dotted border lines, the heat storage plates 17 with dashed border lines.

• - Ein waagrecht unten liegendes Boden-Flächenelement 2, befestigt an vier kurzen, als Füße dienenden unteren Ständerelementen 6;
• - vier senkrecht stehende, an oberen Ständerelementen 7 befestigte Seiten-Flächenelemente 3, wovon eines als Front-Flächenelement 4 mit einer Beschickungsöffnung 8 versehen ist, und
• - ein waagrecht oben liegendes Decken-Flächenelement 5.

Specifically, the following are provided:

• - A horizontally underlying floor planar element 2, fastened to four short, serving as feet lower stand elements 6;
• - Four vertical side surface elements 3 fastened to upper stand elements 7, one of which is provided as a front surface element 4 with a loading opening 8, and
• - a horizontal ceiling surface element 5.

The floor surface element 2 consists of a flat, trough-shaped sheet metal base body 12, in which an insulating layer 16 and a heat storage plate 17 are inserted ( 2 ), whereby the heat storage plate 17 of the bottom surface element 2 serves as the bottom plate of the stove 1, on which -when heated with a solid heating fire (wood, charcoal) this is ignited and burns, and on which -after freeing up and cleaning the corresponding surface - the baked goods (e.g. pizza, tarte flambée, bread) are placed directly on them or on which cooking, cooking or casserole dishes or grill racks are placed.
Alternatively, heating with gaseous fuels or gasified liquid fuels can also be provided, which will be discussed later.

The sheet metal base body 12 of the floor planar element 2 is provided with upward-pointing, U-shaped, 2 X 90° folds 27 on all sides (see Fig. 3 and 6 ) Mistake. The upper, horizontal, free fold ends 32 of the folds 27 have recesses 20 into which nose-shaped insertion elements 26 (see Fig. 5 ). 1 indicates.

Indentations 28 are provided at the corners of the sheet metal base body 12 for receiving and fastening the lower stand elements 6, which serve as feet and consist of short square tube sections, see detailed illustration in 3 . For this purpose, the fold 27 is bent at right angles around a vertical axis in the region of the indentations 28 (after the free fold end 32 has been correspondingly shortened or folded), so that an end section 29 with a bearing surface 30 is formed.
In the preferred embodiment shown here, the flat bottom plate of the sheet metal base body 12 is not cut out or at least not completely cut out in the area of the indentations 28, but is at least partially left standing (triangle-shaped as can be seen here). Horizontal transverse slots 31 are provided in the lower stand elements 6 , into which the surfaces of the floor panel left standing are pushed until the bearing surfaces 30 of the end sections 29 bear against the side surfaces of the lower stand elements 6 .
In order to obtain an extremely stable, torsion-free construction, the end sections 29 are preferably screwed to the lower stand elements 6 on the contact surfaces 30, which is 3 is shown symbolized only by corresponding bores in the end sections 29 and the side faces of the lower stand elements 6 .
As an alternative to the preferred embodiment shown here, other types of attachment of the lower stand elements 6 to the end sections 29 that can be detached without tools can of course also be used, such as, for example. a mushroom head attachment or a hook-on attachment. It is then of course not possible to slide the floor panel into transverse slots 31 of the lower stand elements 6; the floor panel must be cut out in the entire area of the indentation 28.

Together with the (unnumbered) screw connections or alternatives mentioned above, the indentations 28, the end sections 29 and the transverse slots 31 form the “lower fastening devices (28, 29; 31)” according to the claims.

Since the lower stand elements 6 are only short square tube sections, they can remain attached to the sheet metal base body 12 when the furnace 1 is dismantled for transport or storage without this being a hindrance.

Boreholes 35 are also provided in the upper, horizontal, free fold ends 32 of the folds 27 of the sheet metal base body 12 of the floor planar element 2 (see Fig. 3 ), which serve to attach expansion sheet metal base bodies 12a of expansion modules. This will be discussed later.

Floor cutouts and stabilizing folds 23 (see p. 2 ) are provided in the base of the sheet metal body 12 and give the construction additional stability.

Preferably, the sheet metal base body 12 of the floor surface element 2, like the other sheet metal base bodies 13, 14, 15 that will be described later, is made of steel, in particular stainless steel. However, alternative metals such as aluminum are also conceivable.
The lower stand elements 6 as well as the upper stand elements 7 can be made of steel, stainless steel or aluminum and coated or painted as desired.

For the insulating layer 16 of the floor surface element 2, a bio-soluble fiber mat, but preferably a calcium silicate board, can be considered, because the latter is rigid and incompressible, and is therefore better suited as a stable base for the heat storage board 17 lying on it, which of course forms the floor of the combined fire and and forms a cooking or baking or grilling space.
If rigid material such as calcium silicate is used for the insulating layer 16, it may be necessary to split the insulating plate several times in order to be able to install it because of the circumferential free fold ends 32 of the folds 27 projecting into the base area. However, this is not a disadvantage since after the initial assembly of the furnace 1 according to the invention, for transport from one place of use to another and for (in)storage, the entire floor surface element 2 together with the attached lower stand elements 6 can remain assembled.

The insulating layers 16 of the other surface elements (side surface elements 3, front surface element 4 and cover surface element 5) can also be biosoluble fiber mats or calcium silicate boards. In principle, however, all other heat-resistant insulating materials such as e.g. B Mineral fibers or vermiculite are conceivable as insulating material.

The heat storage panels 17 of both the floor area element 2 and the other area elements (side area elements 3, front area element 4 and ceiling area element 5) are preferably made of refractory concrete and/or refractory cement and/or refractory clay and/or fireclay, too Fireclay casting compound, produced in which the shaping can advantageously be carried out by casting in molds, with mechanical post-processing that may be required after removal from the mold. However, other shaping methods such as pressing, tamping, vibrating rolling or isostatic pressing are also conceivable.

The upper stand elements 7 are placed on the lower stand elements 6 in such a way that the upper stand elements 7 are supported on the lower stand elements 6 . With the preferred use of square tube sections as stand elements 6, 7, this is advantageously made possible by the fact that, for example, the upper stand elements 7 have a clear inside diameter that is slightly larger than the outside diameter of the lower stand element 6, so that the upper stand element 7 telescopes over the lower stand element 6 can be pushed up to a stop provided on this. The end sections 29 of the folds 27 screwed to the lower stand elements 6 can advantageously serve as such a stop.

The upper stand elements 7 show how 4 As can be seen, there are longitudinal slots 34 at the top, and the sheet metal base bodies 14, 15 of the side surface elements 3 and the front surface element 4 have upper fastening elements 19 designed as hanging hooks (see 5 ). Together the longitudinal slots 34 and the upper fastening elements 19 form one form of the claimed upper fastening devices 19, 34. Another, alternative form of the upper fastening devices 61, 34 with a latch 61 (see Fig. 10 ) is intended for foldable front surface elements 4, which will be explained in more detail later.

When the furnace 1 is assembled, the upper fastening elements 19 designed as suspension hooks are suspended in the longitudinal slots 34 .
At the same time, the already mentioned nose-shaped plug-in elements 26 (see Fig. 1 and 5 ) inserted into the respective recesses 20 in the upper, horizontal, free fold ends 32 of the folds 27.
Each side panel element 3 or front panel element 4 is fastened to the upper stand elements 7 at the top by means of the upper fastening elements 19 and sits at the bottom - fixed by means of the insertion elements 26 - on the horizontal, free fold ends 32 of the folds 27 of the sheet metal base body 12 of the floor surface element 2 on.

Of course, other alternative fastening methods can also be provided that are within the skill of the person skilled in the art and within the scope of the inventive idea: For example, instead of the hook-shaped fastening elements 19 engaging in the longitudinal slots 34, mushroom head fasteners can also be used, with the design of the upper part of the upper stand element 7. It is also possible to provide longitudinal slots both on the upper stand element 7 (longitudinal slots 34) and correspondingly in the lateral folds of the sheet metal base body 14, 15 of the side surface elements 3 and the front surface element 4, and upper stand element To connect 7 and sheet metal body 14, 15 by means of flat, inserted metal plates. A particularly stable connection can be achieved in that the flat metal plate is also provided with a slit, which is matched to the wall thickness of the upper post element 7 and the sheet metal thickness, and over the walls of post element 7 and sheet metal base body 14, 15 below them Slots is pushed.

Finally, instead of two fastening elements 19 (only) at the top, four fastening elements 19 can be arranged at the top and bottom, also, but not necessarily, with the insertion elements 26 being omitted.
In these cases, the alternative fastening methods mentioned form the "upper fastening devices" according to the claims.

Based 6 the further structure of a side panel element 3 is explained: The sheet metal base body 14 is flat and trough-shaped, with U-shaped, 2 X 90° folds 33 pointing towards the inside of the oven at least on the top and bottom with free fold ends 21. It is also conceivable to provide the bevels 33 on all sides, ie all around, which gives the construction additional stability.
The insulating layer 16 is placed in the space enclosed by the folds 33 and 33 in such a way that it covers the base area of the sheet metal base body 14 . If a rigid material such as calcium silicate is used for the insulating layer 16 and peripheral bevels 33, it may be necessary to split the insulating panel several times because of the peripheral free fold ends 21 protruding into the base area. However, this is also without disadvantage, since after the initial assembly of the furnace 1 according to the invention, for transport from one place of use to another and for (in)storage, the side surface elements 3 can remain assembled.

When using insulating material that can release components that are harmful to health, such as (mineral) fibers, it may be necessary to hermetically shield the insulating material from the interior of the oven for reasons of food hygiene. In this case, a separating plate 24 between the insulating layer 16 and the heat storage plate 17 is optionally provided.

The component side surface element 3 is completed by the respectively provided heat storage plate 17 . This has grooves 22 on the top 25 and on the bottom, into which the free fold ends 21 of the sheet metal base body 14 engage, such as 6 indicates. The depth of the grooves 22 is matched to the length of the free fold ends 21 and is dimensioned such that the heat storage plate 17 can be hung in the free fold ends 21 . (It should be noted that for reasons of presentation in 2 the grooves 22 are not shown.) The heat storage plate 17 can then, as in 6 shown, butt to sit on the insulating layer 16 of the floor surface element 2 and also butt to the heat storage plate 17 of the floor surface element 2 abut. However, it is also possible to have the heat storage plate 17 of the bottom surface element 2 and the heat storage plates 17 of the side surface elements 3 mitred against one another.
The mutual, right-angled collision of the heat storage plates 17 of the side surface elements 3 can be butt, such as 2 removable, or (not shown) mitered.
It is important, however, that in all cases the heat storage plates 17 meet as closely as possible and without open gaps, so that the heat storage plates 17 form a closed furnace space - except for the loading opening 8 - and no hot flue gases from the furnace can reach metal parts.

A side surface element 3 is designed as a front surface element 4 and has a loading opening 8 through which fire material (e.g. wood, charcoal) or alternatively at least one supply line for gaseous fuels to a burner, as well as the food to be thermally prepared, is fed into the combined fire - and cooking or baking or grilling room can be brought in. For this purpose, the sheet metal base body 15 associated with the front surface element 4, the corresponding insulating layer 16, if necessary the corresponding separating plate 24 and the assigned heat storage plate 17 are provided with a corresponding cutout surrounded by a panel 44, see FIG. 1 , 2 and 7 .
As 7 further shows, the loading opening 8 is flat at the bottom and is formed with the facing 44 in alignment with the bottom heat storage plate 17 serving as the bottom plate of the furnace 1 . The loading opening 8 is provided with a lintel 45 at the top.
Above the charging opening 8 there is a smoke collector 9 with a smoke pipe 10 inserted, which cantilevers outwards and extends over the entire width of the charging opening 8 and is fastened to the sheet metal base body 15 . To attach the smoke collector 9 to the sheet metal base body 15, smoke collector suspension slots 18 are provided on both sides above the loading opening 8 on the sheet metal base body 15 (see Fig. 2 ) can be hooked into the hooks on the sides of the smoke collector 9. Of course, other types of attachment are also conceivable, such as a mushroom head attachment.
The smoke collector 9 is open at the bottom and towards the loading opening 8 over its entire surface and protrudes downwards with the side surfaces and the front surface, such as in particular 7 visible, beyond the lintel 45 into the cross section of the loading opening 8.

Finally, a thermometer hole 11 is provided on the front surface element 4 (see Fig. 1 ), through which a sensor rod of a thermometer, not shown here, can be passed in order to measure and display the furnace interior temperature.

The furnace 1 is covered by the ceiling surface element 5 at the top. As 6 shows, the heat storage plate 17 of the cover surface element 5 is placed butt on the tops 25 of the heat storage plates 17 of the side surface elements 3 and the front surface element 4 . A precisely centered position of the heat storage plate 17 and a high degree of stability of the furnace structure are achieved if, as shown here, the heat storage plate 17 has a stepped design. The heat storage plate 17 of the ceiling surface element 5 can also be split.
The heat storage plate 17 is covered by the insulating layer 16 over its entire surface. The base body 13 of the sheet metal base element 5, which is also flat and trough-shaped, is placed over it, as a kind of cover. This is bent only once by 90° on all sides (see Fig. 6 ) and also covers the tops of the side surface elements 3 or the front surface element 4 and the upper stand elements 7 ( 1 and 6 ).

• Frische Luft wird als Zuluft 47 zum Feuer 46 über den unteren Teil der Beschickungsöffnung 8 angesogen. Die heißen Verbrennungsgase (Rauchgase 48) steigen vom Feuer 46 auf bis zur oberen Wärmespeicherplatte 17, werden umgelenkt in Richtung Beschickungsöffnung 8 und dort um den Sturz 45 herum gezwungen, um nach Passieren der Beschickungsöffnung 8 (aufgrund der hohen Temperatur) wieder nach oben zu steigen, direkt in den Rauchsammler 9, von wo sie dann über das Rauchrohr 10 nach oben abgeführt werden.
• Durch das Vorsehen eines Sturzes 45 und das Hineinragen des Rauchsammlers 9 in den Querschnitt der Beschickungsöffnung 8 wird sichergestellt, dass die Rauchgase, wie Versuche ergaben, vollständig vom Rauchsammler 9 eingefangen und über das Rauchrohr 10 nach oben abgeführt werden.

In 7 the fresh air and flue gas flow conditions are qualitatively represented by drawn flow lines, which occur in a circular manner when burning a solid heating fire (here in the example with firewood) in the explained construction:

• Fresh air is drawn in as supply air 47 to the fire 46 via the lower part of the charging opening 8. The hot combustion gases (flue gases 48) rise from the fire 46 to the upper heat storage plate 17, are deflected in the direction of the loading opening 8 and are forced there around the lintel 45 in order to rise again after passing through the loading opening 8 (due to the high temperature). , directly into the smoke collector 9, from where they are then discharged upwards via the smoke pipe 10.
• The provision of a lintel 45 and the protrusion of the smoke collector 9 into the cross section of the loading opening 8 ensures that the smoke gases, as tests have shown, are completely captured by the smoke collector 9 and discharged upwards via the smoke pipe 10 .

However, a minimal configuration of the furnace 1 without a smoke collector 9, a smoke pipe 10 and a facing 44 is also conceivable. After overcoming the fall 45, the smoke gases 48 simply escape upwards.

• In einem ersten Schritt erfolgt an den Ecken des Boden-Flächenelements 2 die Montage der als Füße dienenden unteren Ständerelemente 6, wozu jeweils das in den zugeordneten Einzug 28 ragende Blechteil des Metallblech-Grundkörpers 12 des Boden-Flächenelements 2 in den Querschlitz 31 des unteren Ständerelements 6 eingeführt wird, bis die Seitenwandungen des unteren Ständerelements 6 an den Anliegeflächen 30 der Endabschnitte 29 der Abkantungen 27 bzw. der freien Falzenden 32 anliegen. Sodann werden die unteren Ständerelemente 6 mit den Endabschnitten 29 durch die (unnummerierten) Bohrungen (s. 3) verschraubt.

The procedure for the initial assembly of a furnace 1 according to the invention is to be described below:

• In a first step, the lower stand elements 6 serving as feet are installed at the corners of the floor planar element 2, for which purpose the sheet metal part of the sheet metal base body 12 of the floor planar element 2 protruding into the assigned indentation 28 is inserted into the transverse slot 31 of the lower stand element 6 is inserted until the side walls of the lower stand element 6 are in contact with the bearing surfaces 30 of the end sections 29 of the folds 27 or the free fold ends 32. Then the lower stand elements 6 with the end sections 29 are inserted through the (unnumbered) bores (see Fig. 3 ) screwed.

In the second step, first the insulating layer 16 and then the heat storage plate 17 are laid in the sheet metal base body 12 of the floor planar element 2 .

In the next (third) step, the upper stand elements 7 are placed on the lower stand elements 6 .

The subsequent fourth step includes - in preparation for the subsequent fifth step - the completion of the side surface elements 3 and the front surface element 4 by introducing the insulating layers 16, the separating plates 24 (if provided) and the heat storage plates 17 in the respective sheet metal base body 14, 15 of the side surface elements 3 or the front surface element 4.

The introduction of a heat storage plate 17 in the sheet metal body 14, 15 can be well based 6 be understood, whereby it should be noted that in 6 the side surface element 3 is already completed and installed, ie it is shown in a vertical position. Advantageously, however, a side surface element 3 is assembled separately and lying. So when “above” and “below” is mentioned in the following, this refers to the vertical installation position acc. 6 , taking into account that this means “left” or “right” or “front” or “back” when the side surface element 3 is put together lying down.
First, the heat storage plate 17 with the upper groove 22 is slightly inclined at the upper free fold end 21 of the fold 33 of the sheet metal base body 14, 15 and then guided up to the stop of the free fold end 21 at the bottom of the groove upwards. The heat storage plate 17 can now be folded slightly inwards (towards the separating plate 24) so that the lower groove 22 is above the lower free fold end 21. The heat storage plate 17 is then guided vertically downwards, the lower free fold end 21 engaging in the lower groove 22 and finally being seated in the bottom of the groove. How out 6 It is further clear that the length of the upper and lower free fold ends 21 and the depth of the upper and lower grooves 22 are matched to one another in such a way that although the assembly described is possible, the heat storage plate 17 in the installed position is no longer guided inwards (in In the direction of the interior of the oven), since the heat storage plate 17 rests on the fold 33 below, the upper free fold end 21 nevertheless engages in the upper groove 22 .

After completing the side surface elements 3 and the front surface element 4 as described, these are—in the fifth step—hung in the upper stand elements 7, specifically by hanging the hook-shaped upper ones
Fastening elements 19 in the longitudinal slots 34 of the upper stand elements 7 (see Fig. 4 and 5 ) while at the same time inserting the insertion elements 26 arranged at the bottom of the sheet metal base bodies 14, 15 into the recesses 20 of the folds 27 of the sheet metal base body 12 of the floor surface element 2 (see circled detail view in 1 ).

After the side walls of the oven 1 are in place, in the sixth step the heat storage plate 17 of the cover surface element 5 is placed on the tops 25 of the heat storage plates 17 of the side surface elements 3 or the front surface element 4, see FIG. 2 and 6 .
In the last, seventh step, the heat storage plate 17 is covered with the associated insulating layer 16 and the associated sheet metal base body 13, so that the furnace 1 is complete in its minimal configuration.

If, in addition, a facing 44, a smoke collector 9 and a smoke pipe 10 are advantageously provided, the front surface element 4 is finally completed by inserting the facing 44 of the loading opening 8 into this, the smoke collector 9 in the smoke collector hanging slots 18 of the front Surface element 4 hooked and the smoke tube 10 is inserted into the corresponding sheet metal section in the smoke collector 9.

If the furnace 1 is not to be stored or transported in the fully assembled state, it can also be disassembled. It is not absolutely necessary to carry out all the above steps (in reverse order) because - as mentioned - the floor panel 2 together with the lower stand elements 6 can remain assembled as a complete component, as can the side panel elements 3 and the front -surface element 4.
Therefore, to disassemble the oven 1 for transport and/or storage after use, only the individual parts of the cover surface element 5 (sheet metal base body 13, insulating layer 16 and heat storage plate 17) need to be lifted off, the complete side surface elements 3 and the front surface element 4 unhooked, and the upper stand elements 7 are deducted from the lower stand elements 6.

• - Die oberen Ständerelemente 7 werden auf die unteren Ständerelemente 6 aufgesetzt, die ja mit dem kompletten Boden-Flächenelement verbunden geblieben sind.
• - Danach werden die -ebenfalls komplettiert gebliebenen- Seiten-Flächenelemente 3 und das Front-Flächenelement 4 mit den hakenförmigen oberen Befestigungselementen 19 in die Längsschlitze 34 der oberen Ständerelemente 7, sowie die Einsteckelemente 26 in die Ausnehmungen 20 des Metallblech-Grundkörpers 12 des Boden-Flächenelements 2 eingehängt.
• - Schließlich wird die Wärmespeicherplatte 17 des Decken-Flächenelements 5 auf die Oberseiten 25 der Wärmespeicherplatten 17 der Seiten-Flächenelemente 3 und des Front-Flächenelements 4 aufgelegt, und danach mit der zugehörigen Isolierschicht 16 und dem zugehörigen Metallblech-Grundkörper 13 abgedeckt.

The reassembly of the oven 1 after storage and/or transport is correspondingly simple and quick to carry out:

• - The upper stand elements 7 are placed on the lower stand elements 6, which have remained connected to the complete floor area element.
• - Then the side surface elements 3 and the front surface element 4, which have also remained complete, with the hook-shaped upper fastening elements 19 in the longitudinal slots 34 of the upper stand elements 7, and the insertion elements 26 in the recesses 20 of the sheet metal base body 12 of the bottom Surface element 2 mounted.
• - Finally, the heat storage plate 17 of the ceiling surface element 5 is placed on the tops 25 of the heat storage plates 17 of the side surface elements 3 and the front surface element 4, and then covered with the associated insulating layer 16 and the associated sheet metal base body 13.

8th shows an advantageous development of the furnace 1 according to the invention: instead of the full Flat ceiling panel element 5 in the basic version of the oven 1 is provided with a cooking plate 36 in the front part, which is mounted on the upper side 25 (see Fig. 6 ) of the heat storage plates 17 of the left and right side panels 3 and the front panel 4 rests. The hotplate 36 is preferably made of steel, but can alternatively also be made of another material, for example glass ceramic. The hotplate 36 can, as in 8th shown, have a round opening 37 for the insertion of suitable cooking utensil which can be closed by known stove top rings (not shown). However, it can also be closed over the entire surface (not shown in the drawing).
The part of the surface not covered by the hotplate 36 is covered by a partial surface element 38 which has the same structure as the full-surface surface element 5 of the basic design.

In a next advantageous development of the furnace 1 according to the invention, it is provided to arrange a furnace door 57, such as 9 indicates. Such an oven door 57 is required, for example, for baking bread, since no further heat is supplied during the baking process. The furnace door 57 has an angled portion 60 resting on the bottom of the loading opening 8 or on its facing 44, and is held at the top by a holding element 59 (eg magnet or sash) on the outside of the lintel 45 against tipping. A handle 58 is provided for handling.

10 shows a further preferred development of the oven 1 according to the invention with a front panel element 4 that can be folded down 27 of the sheet metal base body 12 of the bottom surface element 2 on the one hand and below on the outside of the sheet metal base body 15 of the front surface element 4 on the other hand a hinge wing is fastened. The two hinge wings are preferably connected to each other with a pull-out hinge pin 63 for the purpose of easy assembly and disassembly of the oven 1 . Alternatively, it is also conceivable to provide a fixed hinge pin 63 and loosely insert a hinge wing into a pocket attached to the front fold 27 of the sheet metal base body 12 of the floor area element 2 or on the outside of the sheet metal base body 15 .

The upper fastening element 19 is a cam 61 which is rotatably fastened to the front panel element 4 and which, in the locked position, engages in the associated longitudinal slot 34 of the corresponding upper stand element 7, and which is used to fold down (or completely dismantle) the front panel element 4 by rotating it is disengaged.
When arranging a front panel element 4 with hinge(s) 62, either its sheet metal base body 15 can be formed without insertion elements 26. Or the recesses 20 in the upper, horizontal free fold ends 32 of the folds 27 of the sheet metal base body 12 of the floor planar element 2 are designed not only as narrow slits, but as planar punched-out sections, the length of which is matched to the length of the plug-in elements 26 in such a way that that the plug-in elements 26 can be unscrewed freely when the front surface element 4 is rotated.

Such a foldable front surface element 4 can be provided, for example, to bring oversized objects that are larger than the loading opening 8 into the oven 1, such as grilling, cooking, simmering or other preparation equipment or oversized food (e.g. so-called "Family" or "party pizza", whole suckling pigs, etc.).
In this case it would also be conceivable to operate the oven 1 entirely without a front surface element 4 . Compared to operation with a built-in front surface element 4, however, this would have the disadvantage of greater heat loss, ie: longer heating-up time, greater fuel requirement, shorter warm-up time, etc.

As an alternative to the solid fuel fire 46, the furnace 1 according to the invention can also be heated with gaseous or gasified liquid fuels. 11 shows a suitable gas burner 49.
However, the application of the gas burner 49 is not limited to the furnace 1 according to the invention presented here. Rather, the gas burner 49 can also be used in any other suitable oven for heating a combined fire and cooking or baking or grilling area, which is why protection for the gas burner 49 itself is also sought after in this case.

• Der Gasbrenner 49 wird durch die Beschickungsöffnung 8 in den Ofenraum eingeführt und auf der den Boden bildenden Wärmespeicherplatte 17 abgestellt.
• Zum Aufheizen (s. 12) des Ofens 1 sind die Brennerrohre 50, 51 wie gezeigt gabelförmig angeordnet, so dass die Brennerdüsen 56 des im Bild rechten Brennerrohres 50 nach oben auf die Wärmespeicherplatte 17 des Decken-Flächenelements 5 gerichtet sind und die Flammen in erster Linie diese aufheizen. Die Brennerdüsen 56 des im Bild linken Brennerrohres 51 hingegen weisen nach unten, zur Wärmespeicherplatte 17 des Boden-Flächenelementes 2 hin, so dass die Flammen schwerpunktmäßig diese aufheizen.
• Ist der Ofen 1 auf die gewünschte Temperatur aufgeheizt, kann, z.B. zum Brot backen, der Gasbrenner 49 entnommen werden. Das Brot bäckt alleine mit der gespeicherten Wärme, wobei sinnvoll die Beschickungsöffnung 8 mit der Ofentüre 57 verschlossen wird.
• Soll hingegen z. B. Pizza gebacken werden und dafür eine ständige weitere Wärmezufuhr erforderlich sein, wird nach dem Aufheizen das in den Bildern linke Brennerrohr 51 um die von den zugehörigen Schellen 53 gebildete Achse um 180° geschwenkt, so dass, wie 13 zeigt, beide Brennerrohre 50, 51 am im Bild rechten Rand des Ofenraumes positioniert sind, und die Grundfläche des Ofenraumes in der Mitte frei ist für das zu backende Gut. Weiterhin weisen die Brennerdüsen 56 nunmehr beider Brennerrohre 50 und 51 nach oben und beide beheizen den gesamten Ofenraum (bei ggf. gedrosselter Gaszufuhr).

As 11 shows, the gas burner 49 has two elongated burner tubes 50, 51 bent in an S-shape, which are fastened at one end to a carrier element 52 by means of screwed-on clamps 53 so that they can rotate along the longitudinal axis. In the exemplary embodiment shown, the carrier element 52 is designed as a U-shaped, bent sheet metal part with folds on the ends of the legs in order to be able to attach the clamps 53 to the carrier element 52 . However, the carrier element 52 can also be designed differently, for example in the form of a square tube section or as a solid part. At the opposite end of each burner Tube 50, 51 are provided with flat, cuboid mounting elements 54 with a central bore, which are penetrated by the burner tubes 50, 51. The burner tubes 50, 51 are held at a predetermined distance from the contact area (here: heat storage plate 17 of the floor surface element 2) by the carrier element 52 and the positioning elements 54. Connection coupling elements 55 for a hose connection to the gas source (eg propane/butane gas cylinder) are provided at the ends of the burner tubes 50, 51. The legs of the burner tubes 50, 51 facing away from the connection coupling elements 55 have bores on one side as burner nozzles 56, such that the burner nozzles 56 point upwards in the burner tube 50 on the right in the figure, and downwards in the burner tube 51 on the left in the figure, towards the ground (therefore in 11 not visible). This applies to the in 11 illustrated, forked alignment of the burner tubes 50, 51. Each burner tube 50, 51 can be pivoted about the axis formed by the associated clamps 53, so that it is also possible to point the burner nozzles 56 of both burner tubes 50, 51 only upwards or downwards align by pivoting the corresponding burner tube 50, 51 by 180°.
This will be from the 12 and 13 clearly, which show exemplary possible arrangements of the gas burner 49 in the furnace 1 according to the invention in a plan view of the furnace 1 with the ceiling surface element 5 removed:

• The gas burner 49 is introduced into the furnace chamber through the loading opening 8 and placed on the heat storage plate 17 forming the floor.
• To heat up (p. 12 ) of the furnace 1, the burner tubes 50, 51 are arranged in a fork shape as shown, so that the burner nozzles 56 of the burner tube 50 on the right in the figure are directed upwards onto the heat storage plate 17 of the ceiling surface element 5 and the flames primarily heat this up. The burner nozzles 56 of the burner tube 51 on the left in the figure, on the other hand, point downwards towards the heat storage plate 17 of the floor surface element 2, so that the flames primarily heat this up.
• Once the oven 1 has been heated to the desired temperature, the gas burner 49 can be removed, for example for baking bread. The bread is baked solely with the stored heat, with the loading opening 8 being closed with the oven door 57 in a sensible manner.
• Should, however, z. B. Pizza are baked and for this a constant further supply of heat is required, after heating, the burner tube 51 on the left in the pictures is pivoted about the axis formed by the associated clamps 53 by 180°, so that, as 13 shows both burner tubes 50, 51 are positioned on the right edge of the oven chamber in the picture, and the base of the oven chamber in the middle is free for the goods to be baked. Furthermore, the burner nozzles 56 of both burner tubes 50 and 51 now point upwards and both heat the entire furnace space (with the gas supply possibly being throttled).

Experiments have shown that a smoke flavor of the food to be baked/cooked/grilled, which is desired even with gas burner heating, can advantageously be produced in that, after heating up, after the gas burner 49 is in the position according to FIG 13 has been brought, only puts a piece of firewood on the gas burner 49 and lets it burn.

In the examples shown according to 11 until 13 the burner nozzles 56 in the burner tubes 50, 51 are arranged pointing upwards or downwards. It is of course also possible, if required, to arrange the burner nozzles 56 structurally to the side, for example if lateral areas are to be heated in a targeted manner.
It is also conceivable for this purpose to pivot one or both burner pipe(s) 50, 51 through an angle other than 180°, for example through 90°, in which case the safe position of the gas burner 49 can be ensured by suitable measures (e.g. large base width and /or great weight and/or anchoring of the carrier element 52) must be ensured, since one of the two burner tubes 50, 51 is no longer supported on the positioning element 54 on the ground, but cantilevers out freely.

The furnace 1 according to the invention can be expanded in a modular manner.

So is like in the 14 and 15 shown, in an advantageous development of the invention, an extension of the furnace 1 to the side is possible, with an example of an extension of the base module 1a by an extension module 1b being shown in the picture to the right and explained.

The extension module 1b is based on an extension sheet metal base body 12a of the floor area element 2, which is modified compared to the sheet metal base body 12 of the base module 1a in that the 2 X 90° bevel 27 on the left side is not U-shaped , but is Z-shaped, see 15 . This creates a free fold end 32 of the fold 27 pointing outwards towards the sheet metal base body 12 of the base module 1a, which can be placed over the free fold end 32 of the sheet metal base body 12 of the base module 1a and connected to it through the bores 35, e.g. screwed .

Since the lower stand elements 6 on the connection side are completely retracted into the sheet metal base body 12 of the base module 1a, no indentation 28 needs to be provided on the left side of the sheet metal base body 12 of the extension module 1b.
Extension stand elements 39 are placed on the lower stand elements 6 . In 15 this is shown assembled at the front corner of the sheet metal base body 12 in the image in the not yet assembled state, and at the rear corner in the image.
Both extension stand elements 39 are connected to one another by a cross member 42 . For this purpose, cutouts 40 with lugs 41 are provided on the extension stand elements 39 at the upper end, pointing towards the respective opposite extension stand element 39, which, during assembly, can be inserted into insertion slots 43 (see rotated detail view in circle in 15 ) engage at the ends of the cross member 42.
The extension stand elements 39 have slots 34 at the top into which the left-hand and right-hand side surface element 3 or front surface element 4 can be hung.
No separation in the form of a side surface element 2 is provided between the base module 1a and the expansion module 1b, so that a single, enlarged, combined fire and cooking or baking or grilling space is created.
are preferred, as in 14 shown, two front surface elements 4 with loading openings 8 are provided in the lateral expansion, although it is also possible in principle to make do with just one front surface element 4 at the expense of more difficult loading of the furnace 1 .

In the present embodiment according to 15 For optical reasons, the extension stand elements 39 provided between the base module 1a and the extension module 1b have a different design than the upper stand elements 7 on the left and right ends of the oven 1. For example, the slots 34 in the upper stand elements 7 are in a diagonal arrangement (see . 4 ) required, with the extension stand elements 39 opposite on a side surface (see 15 ). Furthermore, the extension (not numbered) downwards of the upper stand elements 7 is two-sided across the corner (see Fig. 4 ), while the corresponding downward extension for the extension stand elements 39 can only be carried out on one surface.
It should be pointed out that within the scope of expert knowledge - if the design is not so appealing to the eye - it is also possible, in a simplified and therefore more cost-effective manner, to design the upper stand elements 7 and the extension stand elements 39 as identical parts, e.g. without any covering extensions downwards and with all-round hanging options for the side surface elements 3.

Analogously to the extension to the right, such an extension can of course also be made to the left, in which case the Z-shaped fold 27 is then of course to be provided on the right-hand side of the extension module 1b. An expansion is also not limited to just two oven modules, as shown here, but can in principle include any number of oven modules arranged next to one another and connected to one another.

Alternatively, instead of a lateral extension, in another advantageous development of the invention, an extension of the oven 1 to the rear can also be provided, as is shown in 16 is shown. In principle, the same components are used as in the case of the lateral extension, only the arrangement of the Z-shaped fold 27 of the extension module 1b has to be adjusted laterally. Of course, there is no separation between the base module 1a and the extension module 1b by a side surface element 3 when extending to the rear, so that a single, enlarged, combined fire and cooking or baking or grilling area is created.

A further advantageous development of the invention consists in an upward extension of the furnace 1, which 17 is shown. As can be seen, a second base module 1a is simply placed on a base module 1a in such a way that the lower stand elements 6 of the upper base module 1a engage in the upper stand elements 7 of the lower base module 1a. To do this, either the sheet metal base body 13 of the ceiling surface element 5 of the lower base module 1a must be modified (cut out) at the corners in such a way that the tops of the upper stand elements 7 of the lower base module 1a are exposed, so that the lower stand elements 6 of the upper base module 1a in the upper stand elements 7 of the lower base module 1a can be inserted. Or alternatively, the lower base module 1a is not covered by a sheet metal base body 13, so that the insulating layer 16 closes off the ceiling surface element 5 at the top, as shown here in FIG 17 shown.
The length of the smoke tube 10 of the lower basic module 1a must be adjusted so that the smoke tube 10 freely opens into the upper smoke collector 9 at a sufficient distance from the lower end of the upper smoke tube 10.

Furthermore, it is also possible to use a furnace 1 that is extended to the side or to the rear (see 14 and 16 ) can also be expanded upwards by adding a second floor. the It does not need to be specifically illustrated here, since the person skilled in the art will be able to produce this compilation with this reference, including the preceding disclosure.

Reference List

1

oven

1a

base module

1b

expansion module

2

ground surface element

3

side face element

4

Front face element

5

Ceiling surface element

6

Lower stand element

7

Upper stand element

8th

loading opening

9

smoke collector

10

smoke pipe

11

thermometer hole

12

Sheet metal body (of the floor surface element 2)

12a

Extension sheet metal body

13

Sheet metal base body (of the ceiling surface element 5)

14

Sheet metal body (of a side surface element 3)

15

Sheet metal body (of the front surface element 4)

16

insulating layer

17

heat storage plate

18

Smoke collector hanging slots

19

fastener

20

recess

21

free seam end

22

groove

23

Floor cutouts and stabilizing folds

24

partition plate

25

top

26

male element

27

edging

28

Indent

29

end section

30

lying surface

31

transverse slit

32

Free seam end

33

edging

34

longitudinal slit

35

drilling

36

hot plate

37

opening

38

Ceiling face element

39

Extension stand element

40

cutout

41

Nose

42

cross member

43

insertion slot

44

infatuation

45

fall

46

Fire

47

supply air

48

flue gases

49

gas burner

50

burner tube

51

burner tube

52

carrier element

53

clamp

54

installation element

55

connection coupling element

56

burner nozzles

57

oven door

58

Handle

59

holding element

60

deflection

61

fastener

62

hinge

63

hinge pin

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102013010377 A1 [0002]
• DE 933888 B [0005]

Claims (15)

Portable oven (1) with a combined furnace and cooking or baking or grilling chamber for the thermal preparation of food, which oven (1) consists of a modular system made up of rectangular, plate-shaped surface elements (2, 3, 4, 5) with an insulating layer (16) and a refractory, mineral heat storage layer can be assembled without tools to form a cuboid furnace body and dismantled again, characterized in that at least one floor panel element (2), several vertical side panel elements (3), of which at least one as a front panel element (4) with a loading opening (8), and at least one cover surface element (5) is provided, each consisting of a flat, trough-shaped folded sheet metal base body (12, 13, 14, 15), in which the insulating layer (16) and the refractory mineral heat storage layer designed as a flat heat storage plate (17) are accommodated, with at least the sheet metal base body (12) of the at least one floor panel element (2) and the sheet metal base bodies (14, 15) of the side panel elements (3) and of the at least one front panel element (4) on vertical stand elements (6, 7) arranged on the ends ) are detachably attached. Furnace (1) after claim 1 , characterized in that - lower, short stand elements (6) are fastened as feet to the corners of the sheet metal base body (12) of the at least one floor area element (2), - upper stand elements (7) are provided, which rest on the lower stand elements (6) and to which the sheet metal base bodies (14, 15) of the side surface elements (3) and the at least one front surface element (4) are attached, - the at least one ceiling surface element (5) entirely or rests partly on top of the side surface elements (3) and/or on the upper stand elements (7). Furnace (1) after claim 1 or 2 , characterized in that - lower fastening devices (28, 29; 31) are provided at the corners of the sheet metal base body (12) of the at least one floor planar element (2) and correspondingly on the lower stand elements (6), with which the Sheet metal base body (12) of the at least one floor panel element (2) can be attached to the lower stand elements (6) and that - laterally on the end faces of the sheet metal base bodies (14, 15) of the side panel elements (3) and of the at least one front surface element (4) and corresponding upper fastening devices (19, 34; 61, 34) are provided on the upper stand elements (7), with which the sheet metal base bodies (14, 15) of the side surface elements (3) and the at least one front panel element (4) can be attached to the upper stand elements (7). Oven (1) according to any one of the preceding Claims 1 until 3 , characterized in that the sheet metal base body (12) of the at least one floor planar element (2) has double, upward-pointing, U-shaped folds (27) with free fold ends (32) on its edges, in which recesses (20 ) are arranged, and in that nose-shaped plug-in elements (26) are formed on the bottom of the sheet metal base bodies (14, 15) of the side surface elements (3) and the at least one front surface element (4), which after assembly of the oven (1) engage in the recesses (20). Furnace (1) according to any of the preceding Claims 1 until 4 characterized in that the sheet metal base bodies (14, 15) of the side panel elements (3) and the at least one front panel element (4) have double U-shaped folds (33 ) and that longitudinal grooves (22) are provided at least in the lower and upper narrow sides of the associated heat storage plates (17), which connect to the free fold ends (21) of the folds (33) of the sheet metal base bodies (14, 15) in such a way correspond that the heat storage plates (17) can be hung with the grooves (22) in the free fold ends (21). Oven (1) according to any one of the preceding Claims 1 until 5 , characterized in that a lintel (45) is provided on the front panel element (4) above the loading opening (8) and on the outside of the front panel element (4) there is a box-shaped smoke collector (9) provided with a smoke tube (10), which protrudes with the side surfaces and the front surface downwards beyond the lintel 45 into the cross section of the charging opening 8, so that smoke gases (48) from a fire (46) in the furnace interior are guided around the lintel (45) and then, rising again, into the Smoke collector (9) are initiated. Oven (1) according to any one of the preceding Claims 1 until 6 , characterized in that a ceiling surface element (5) is provided, which only extends over a partial surface area of the base surface, and that a cooking plate (36) is arranged on the remaining surface area, on which conventional cooking can be done. Oven (1) according to any one of the preceding Claims 1 until 7 , characterized in that the loading opening (8) can be closed with an oven door (57). Oven (1) according to any one of the preceding Claims 1 until 8th , characterized in that the at least one front panel element (4) is designed so that it can be folded down, for which purpose the sheet metal base body (15) of the front panel element (4) by means of at least one hinge (62) on the sheet metal base body (12) of the Ground surface element (2) fixed, and the upper fastening element (19) of the front surface element (4) is designed as a latch (61). Oven (1) according to any one of the preceding Claims 1 until 9 , characterized in that the furnace (1) can be expanded in a modular manner by arranging additional surface elements (2, 3, 4, 5) and extension stand elements (39) as well as at least one cross member (42) connecting the extension stand elements (39) at the top is such that the furnace depth and/or the furnace width is increased and/or that the furnace (1) is increased by one or more levels by an expansion module (1b) being placed on a lower base module (1a). Gas burner (49) for heating an oven (1) with a combined fire and cooking or baking or grilling space for the thermal preparation of food, characterized in that the gas burner (49) has two elongated, S-shaped bent, on a support element ( 52) has burner tubes (50, 51) fastened such that they can rotate along the longitudinal axis, each with burner nozzles (56) arranged lengthwise on one side, such that the burner nozzles (56) of both burner tubes (50, 51) in a first alignment of the burner tubes (50, 51) in the same Point in the right direction and point in opposite directions after one of the burner tubes (50, 51) has been rotated about its longitudinal axis by 180°. Oven (1) according to any one of the preceding Claims 1 until 10 , characterized in that it is provided with a gas burner (49). claim 11 is heated. Method for the initial assembly of a furnace (1) according to one of claims 2 until 9 , Characterized by the following method steps: - Attaching the lower stand elements (6) to the corners of the sheet metal base body (12) of the floor surface element (2), - Inserting the insulating layer (16) and then the heat storage plate (17) in the sheet metal Base body (12) of the floor panel element (2), - placing the upper stand elements (7) on the lower stand elements (6), - completing the side panel elements (3) and the front panel element (4) by introducing the insulating layers ( 16) and heat storage plates (17) in the respectively associated sheet metal base bodies (14, 15), - Hanging the completed side surface elements (3) and the completed front surface element (4) in the upper stand elements (7) and in the metal sheet - Base body 12 of the floor surface element (2), - placing the heat storage plate (17) of the ceiling surface element (5) on the tops (25) of the heat storage plates (17) of the side surface elements (3) and the front surfaces elements (4), - covering the heat storage plate (17) of the ceiling surface element (5) with the associated insulating layer (16) and the associated sheet metal base body (13). Method of disassembling the furnace (1) according to any one of claims 2 until 9 for transport and/or storage after use , characterized by the following process steps: - lifting the metal sheet base body (13), the insulating layer (16) and the heat storage plate (17) of the ceiling surface element (5), - unhooking the complete side surface elements ( 3) and the front panel element (4), - removing the upper stand elements (7) from the lower stand elements (6). Method of reassembling the oven (1) according to any one of claims 2 until 9 after storage and/or transport, characterized by the following process steps: - placing the upper stand elements (7) on the lower stand elements (6), - hanging the completed side panel elements (3) and the completed front panel element (4) in the upper stand elements (7) and in the sheet metal base body 12 of the floor panel element (2), - placing the heat storage panel (17) of the cover panel element (5) on the tops (25) of the heat storage panels (17) of the side panel elements (3) and the front surface element (4), - covering the heat storage plate (17) of the ceiling surface element (5) with the associated insulating layer (16) and the associated sheet metal base body (13).

Images