DK9600269U3

DK9600269U3 - Oven with forced ventilation.

Info

Publication number: DK9600269U3
Application number: DK9600269U
Authority: DK
Inventors: Franco Mangina; Luca Codazzi
Original assignee: Electrolux Zanussi Grandi Impi
Priority date: 1995-09-14
Filing date: 1996-08-14
Publication date: 1996-10-25
Also published as: ES1035041U; GB2305237A8; ES1035041Y; FR2738900B1; GB9616592D0; ITPN950036V0; FR2738900A1; GB2305237A; IT238862Y1; GB2305237B; ITPN950036U1

Description

DK 96 00269 U3DK 96 00269 U3

Den foreliggende opfindelse angår en ventileret ovn til bagning eller kogning af fødevarer, hvilken ovn kan udføre bagningen eller kogningen vha en strøm af forbrændingsgasser, som, genereret af en flerhed af opvarmningselementer, tvinges af en eller flere blæsere til at cirkulere i et opvarmningskammer, hvori fødevarerne, der skal bages eller opvarmes, placeres.The present invention relates to a ventilated oven for baking or cooking food, which oven can perform the baking or cooking by means of a stream of combustion gases which, generated by a plurality of heating elements, is forced by one or more fans to circulate in a heating chamber in which the foods to be baked or heated are placed.

Nærmere bestemt angår opfindelsen en konvektionsovn med direkte opvarmning til bagning eller kogning af fødevarer for store grupper mennesker, men det vil forstås, at det, der beskrives og kræves, er anvendeligt til en hvilken som helst type ovn til bagning eller kogning af fødevarer, forudsat at den har organer til omrøring af den interne atmosfære i bagekammeret.More specifically, the invention relates to a convection oven with direct heating for baking or cooking food for large groups of people, but it will be understood that what is described and required is applicable to any type of oven for baking or cooking food, provided that it has means for stirring the internal atmosphere of the baking chamber.

Det er kendt, at bagning af fødevarer i en ovn involverer meget forskellige procedurer, afhængigt af de resultater og virkninger, der skal opnås, men som også har specifikke ulemper såsom overopvarmning af fødeledningerne for forbrændingsgasserne og dårlig adgang til de forskellige komponentdele, specielt til opvarmningselementerne, som kan være udformet med brændere.It is known that baking food in an oven involves very different procedures, depending on the results and effects to be obtained, but which also have specific disadvantages such as overheating the feed lines for the combustion gases and poor access to the various component parts, especially to the heating elements. , which can be designed with burners.

Faktisk når forbrændingsgasserne i disse ovne normalt meget høje temperaturer af størrelsesordenen 700-900°C, så for at begrænse opvarmningsvirkningen er det nødvendigt at bruge specielle og derfor dyre materialer, som udviser specielle egenskaber med hensyn til modstandsdygtighed over for varmebelastninger, eller specielle indretninger, som gør konstruktionen og brugen af ovnen endnu mere kompliceret.In fact, the combustion gases in these furnaces usually reach very high temperatures of the order of 700-900 ° C, so in order to limit the heating effect it is necessary to use special and therefore expensive materials which exhibit special properties with regard to heat resistance, or special devices, which makes the construction and use of the oven even more complicated.

Desuden er forbrændingskammeret og brænderne i nogle tilfælde anbragt i nærheden af ovnens bund, så at andre komponenter af ovnen (såsom motoren for blæseren og styreindretningerne) er åbenbart udsat for de høje og uønskede temperaturer, som reducerer deres funktionelle stabilitet.In addition, the combustion chamber and burners are in some cases located near the bottom of the furnace, so that other components of the furnace (such as the fan motor and control devices) are obviously exposed to the high and undesirable temperatures which reduce their functional stability.

Specielt beskriver patent GB 1507371, udstedt til de samme ansøgere, en ovn til bagning af fødevarer, som er forsynet med et forbrændingskammer, der er anbragt lige bag selve ovnen, og en indretning til fortynding af røggas vha blanding deraf med de varme 2 DK 96 00269 U3 gasser, der kommer fra forbrændingen, og de kolde gasser, der er til stede i bagerummet. Konstruktionen har den ulempe, at de udbrændte fortyndingsgasser, som transporterer urenheder og fedtpartikler, forurener indsugningsledningen, i hvilken de fjernes, såvel som forbrændingskamret på et sted svarende til strømvendingskanterne.Specifically, patent GB 1507371, issued to the same applicants, discloses an oven for baking food provided with a combustion chamber located just behind the oven itself and a device for diluting flue gas by mixing it with the heat 2 DK 96 00269 U3 gases coming from the combustion and the cold gases present in the baking room. The construction has the disadvantage that the burnt-out dilution gases which transport impurities and grease particles contaminate the suction line in which they are removed, as well as the combustion chamber at a location corresponding to the flow reversing edges.

Kontakten mellem de ovennævnte stoffer og de varme gassers høje temperatur frembringer krakning deraf, med efterfølgende produktion af uønskede flygtige komponenter og sod, som ved indføring i bagerummet skader kvaliteten og udseendet af de deri tilstedeværende fødevarer.The contact between the above-mentioned substances and the high temperature of the hot gases causes cracking thereof, with subsequent production of undesirable volatile components and soot, which upon introduction into the baking room damages the quality and appearance of the foods present therein.

Det ovennævnte patent tilvejebringer desuden en enkelt røggasledning, hvorigennem der evakueres: - forbrændingsgasser (i overgangsetapen eller ved motorsammenbrud); og - forbrændingsgasser og damp, som er genereret ved bagning af fødevarerne (i den normale driftstilstand).The aforementioned patent further provides a single flue gas line through which to evacuate: - combustion gases (in the transition stage or by engine breakdown); and - combustion gases and vapors generated by baking the food (in the normal operating state).

Gassernes volumen varierer afhængigt af ovnens temperatur og den mængde vand, som fordamper fra fødevarerne, hvilket skaber variationer i de vol umetriske udløbsevner, som er meget følsomme, og dette har en negativ virkning på bageprocessens effektivitet, idet de har den virkning, at de ændrer de normale indsugningsforhold for forbrændingsgasserne, med tab i varmeydelsen.The volume of the gases varies depending on the temperature of the oven and the amount of water evaporating from the food, which creates variations in the volumetric discharge capacities which are very sensitive and this has a negative effect on the efficiency of the baking process as they change the normal intake conditions for the combustion gases, with loss in heat output.

Forbrændingskammerets stilling lige bag ovnen, gør brugen deraf meget kompliceret, både fordi brænderens flamme ikke er direkte synlig for brugeren, der normalt er placeret foran ovnen (og det er velkendt, hvor vigtigt det er fra et sikkerhedsmæssigt synspunkt, øjeblikkeligt og direkte at kunne kontrollere, om en almindelig flamme er eller ikke er til stede), og fordi den samlede longitudinale dimension af ovnen, som allerede er negativt påvirket af blæserens indretning ved den lodrette endedel af bagerummet, forøges yderligere, hvilket ofte skader ovnens stabilitet.The position of the combustion chamber just behind the stove makes its use very complicated, both because the flame of the burner is not directly visible to the user, usually located in front of the stove (and it is well known how important it is from a safety point of view, immediate and direct control whether or not a common flame is present) and because the overall longitudinal dimension of the furnace, which is already adversely affected by the blower arrangement at the vertical end portion of the baking compartment, is further increased, often affecting the oven's stability.

Der er derfor behov for at tilvejebringe en ventileret ovn, specielt til forsyning af store grupper mennesker, der overvinder de 3 DK 96 00269 U3 ovennævnte ulemper og hvis konstruktion er enkel og pålidelig og gør brug af tilgængelige teknologier.Therefore, there is a need to provide a ventilated furnace, especially for the supply of large groups of people who overcome the disadvantages mentioned above and whose design is simple and reliable and uses available technologies.

Formålet med den foreliggende opfindelse er at tilvejebringe en ovn af den ovennævnte type med tvungen konvektion, og hvor komponenterne, specielt opvarmningselementerne, er let tilgængelige.The object of the present invention is to provide an oven of the above-mentioned type with forced convection and the components, especially the heating elements, are readily available.

Et andet formål med opfindelsen er at tilvejebringe en ovn, som ikke medfører en forøgelse af dens longitudinale dimension.Another object of the invention is to provide an oven which does not increase its longitudinal dimension.

10 1510 15

Et yderligere formål med opfindelsen er at tilvejebringe en ovn af den ovenbeskrevne type, som har et forbedret system til luftcirkulation mellem forbrændingskammeret, opvarmningskammeret og udledningen således, at den sikrer en optimal teknisk driftstilstand og undgår brugen af specielle materialer.A further object of the invention is to provide a furnace of the type described above which has an improved air circulation system between the combustion chamber, the heating chamber and the discharge so as to ensure optimum technical operating condition and avoids the use of special materials.

20 25 3020 25 30

Ifølge den foreliggende opfindelse er der tilvejebragt en ovn med tvungen konvektion, hvilken ovn omfatter et bagerum, en røggastransportør og et opvarmningskammer med passende opvarmningsorganer, som i hovedsagen er i forbindelse med hinanden, hvilket opvarmningskammer gennemstrømmes og opvarmes af omgivende luft, som trækkes ind vha blæsemidler anbragt i et ventilationskammer, hvilke blæsemidler kan frembringe cirkulation i et i hovedsagen lukket kredsløb dannet af nævnte bagerum, nævnte røggastransportør og nævnte ventilationskammer, af en strøm af gasser i varmevekslingsmæssigt forhold med nævnte opvarmningskammer, som er forsynet med et rør til udledning af forbrændingsgasserne, og en mulig flerhed af pander anbragt lodret i nævnte bagerum, hvor nævnte røggastransportør i hovedsagen er indeholdt i nævnte ventilationskammer og over hvilken strømmen af gasser, der cirkulerer i nævnte venti lationskammer, passerer direkte, i det mindste på de to horisontale flader.According to the present invention there is provided a forced convection oven which comprises a baking room, a flue gas conveyor and a heating chamber with suitable heating means which are generally interconnected, which heating chamber is flowed and heated by ambient air which is drawn in by means of blowing agents arranged in a ventilation chamber, which blowing agents can produce circulation in a substantially closed circuit formed by said baking room, said flue gas conveyor and said ventilation chamber, of a flow of gases in heat exchange relationship with said heating chamber provided with a pipe for discharge of gas to discharge and a possible plurality of pans arranged vertically in said baking space, said flue gas conveyor being substantially contained in said ventilation chamber and over which the flow of gases circulating in said ventilation chamber passes directly, at least on the two horizontal surfaces.

Opfindelsen vil blive bedre forstået ud fra den følgende beskrivelse, der kun skal opfattes som ikke-begrænsende eksempel, og under henvisning til den ledsagende tegning, hvor: fig. 1, 2 og 3 viser hhv. et fronttværsnit, et sidetværsnit og et planbillede af en ovn ifølge opfindelsen, forsynet med et enkelt forbrændingskammer og en enkelt blæser; 35 4 DK 96 00269 U3 fig. 4 og 5 viser hhv. et fronttværsnit og et sidetværsnit af en ovn ifølge opfindelsen forsynet med et enkelt forbrændingskammer, men med to oven over hinanden anbragte blæsere; og fig. 6 viser et frontbillede af en ovn ifølge opfindelsen, forsynet med to blæsere og to oven over hinanden anbragte brændere.The invention will be better understood from the following description which is to be construed as a non-limiting example only, and with reference to the accompanying drawings, in which: 1, 2 and 3 show respectively. a front section, a side section and a plan view of a furnace according to the invention, provided with a single combustion chamber and a single blower; 35 4 DK 96 00269 U3 fig. 4 and 5 show respectively. a front cross-section and a side cross-section of a furnace according to the invention provided with a single combustion chamber, but with two superimposed fans; and FIG. 6 shows a front view of a furnace according to the invention, provided with two fans and two burners arranged one above the other.

For enkelthedens skyld vil opvarmningsmidlerne, der er indeholdt i opvarmningskammeret, i det følgende blive beskrevet som typiske gasbrændere i den omgivende atmosfære, men det vil forstås, at andre typer af opvarmningsindretninger kan anvendes på fordelagtig vis.For the sake of simplicity, the heaters contained in the heater chamber will hereinafter be described as typical gas burners in the ambient atmosphere, but it will be appreciated that other types of heaters may be used advantageously.

Fig. 1, 2 og 3 viser en ovn til bagning eller kogning af fødevarer til grupper af mennesker, hvilken ovn har tvungen cirkulation og omfatter et bagerum 1, et opvarmningskammer 2 forsynet med opvarmningsorganer 3, fortrinsvis gasbrændere, en røggasledning 4 til udledning af forbrændingsgasserne, en røggastransportør 5 til forbrændingsgasserne, og en udledning 6 til de evakuerede forbrændingsgasser og dampene, der produceres i bagekammeret.FIG. 1, 2 and 3 show an oven for baking or cooking food for groups of people, which oven has forced circulation and comprises a baking room 1, a heating chamber 2 provided with heating means 3, preferably gas burners, a flue gas pipe 4 for discharging the combustion gases, a a flue gas conveyor 5 for the combustion gases, and a discharge 6 for the evacuated combustion gases and vapors produced in the baking chamber.

Ovnen har yderligere et ventilationskammer 7, som indeholder en motordrevet blæser af den konventionelle type (ikke indikeret ved henvisningstal) anbragt ved bagsiden af ovnen.The furnace further has a ventilation chamber 7 which contains a motor-driven fan of the conventional type (not indicated by reference numerals) disposed at the rear of the furnace.

Som bedre vist i fig. 2 er indsugningsvæggen lOs frontdel udformet således, at den ender med en ringformet spalte 8, der er åben mod. kanten 9, som er rettet mod den centrale del af venti lati onskammeret, og er dimensioneret og positioneret således, at gasstrømmen, der udsendes fra den ringformede spalte 8, har en deraf følgende ringformet udformning og udsendes mod ventilationskammerets indre.As better shown in FIG. 2, the front part of the intake wall 10 is formed so that it ends with an annular slot 8 which is open towards. the edge 9, which is directed towards the central part of the ventilation chamber, and is dimensioned and positioned so that the gas flow emitted from the annular slot 8 has a consequent annular configuration and is emitted to the interior of the ventilation chamber.

Indsugning af forbrændingsgasserne foregår faktisk langs hele den ringformede indsugningssektion af blæseren, hvilket forbedrer både indsugningsvirkningen og den efterfølgende indblæsning i passende ledninger, som ikke er vist, men som er kendt af fagfolk og kan fordele gassen til bagerummets indre.In fact, the combustion gases are sucked in along the entire annular suction section of the fan, which improves both the suction effect and the subsequent blow-in of suitable wires, not shown, but known to those skilled in the art, and can distribute the gas to the interior of the baking room.

Fordelen ved denne udformning stammer fra det faktum, at røggas- 5 DK 96 00269 U3 transportøren 5 optager hele den strøm, der produceres af blæseren, og derfor fungerer som en varmeveksler mellem "kolde" gasser (indtil og omkring 300°C), der cirkulerer i ventilationskammeret, og de varme forbrændingsgasser, der kommer fra forbrændingskamme-5 ret, og som nedkøles igen og når indsugningsspalten 8 med en tem peratur, der ikke frembringer overophedning af metalpladerne.The advantage of this design stems from the fact that the flue gas conveyor 5 absorbs all the power produced by the blower and therefore acts as a heat exchanger between "cold" gases (up to and including 300 ° C) which circulates in the ventilation chamber and the hot combustion gases emanating from the combustion chamber which are cooled again and reach the intake slot 8 at a temperature which does not cause overheating of the metal plates.

Denne driftsmåde overvinder ulemperne, der stammer fra fortyndingen af de varme forbrændingsgasser med "kolde" evakuerede gasser, 10 hvilket opleves ved anvendelse af en ovn ifølge det ovennævnte pa tent; da den foreliggende opfindelse ikke medfører blanding af "kolde, urene" gasser med "varme, rene" gasser, kan de ovennævnte ulemper faktisk ikke opstå, hvilket skyldes det faktum, at de varme gasser, der produceres i opvarmningskammeret, nedkøles betyde-15 ligt i røggastransportøren, der fungerer som en "varmeveksler", før de blandes med de urene gasser, der er til stede i bagerummet.This mode of operation overcomes the disadvantages arising from the dilution of the hot combustion gases with "cold" evacuated gases, which is experienced by using an oven according to the aforementioned patent; In fact, since the present invention does not cause mixing of "cold, impure" gases with "hot, clean" gases, the above-mentioned disadvantages cannot arise, due to the fact that the hot gases produced in the heating chamber are significantly cooled in the flue gas conveyor, which acts as a "heat exchanger" before mixing with the impure gases present in the baking room.

Udover den strukturelle udformning, der er vist i figurerne, er det muligt og fordelagtigt at indrette opvarmningskammeret 2 ikke 20 ved bagsiden af ovnen, men lateralt, hvilket indebærer åbenlyse fordele både med hensyn til ovnens samlede størrelse og driftssikkerheden, når man tager i betragtning, at det på denne måde er muligt at se direkte fra et sted foran ovnen, om flammen 3 fra brænderne er til stede, eller om opvarmningsorganerne overhovedet er 25 aktiveret.In addition to the structural design shown in the figures, it is possible and advantageous to arrange the heating chamber 2 not 20 at the rear of the furnace, but laterally, which offers obvious advantages in both the overall size of the oven and the reliability of the oven, in this way it is possible to see directly from a place in front of the stove whether the flame 3 from the burners is present or whether the heating means are at all activated.

Den viste konstruktion omfatter også en passende ledning 5 til udledning af evakuerede forbrændingsgasser og til dampe, der produceres i bagerummet.The construction shown also includes a suitable conduit 5 for discharging evacuated combustion gases and for vapors produced in the baking room.

3030

Fordelen ved denne konstruktion opnås ved at gøre driften af de to røggasledninger uafhængig, således at overgangs- eller uregelmæssighedssituationer med hensyn til driften i den ene af nævnte ledninger kun har en minimal indflydelse på driftsforholdene i den 35 anden ledning.The advantage of this construction is obtained by making the operation of the two flue gas lines independent, so that transitional or irregularities with respect to the operation of one of said pipes have only a minimal influence on the operating conditions of the other pipe.

Indsugningsvæggen 10, som fortrinsvis dannes af en i hovedsagen lodret, plan væg, adskiller ventilationskammeret fra bagekammeret.The intake wall 10, which is preferably formed by a generally vertical, flat wall, separates the ventilation chamber from the baking chamber.

6 DK 96 00269 U36 DK 96 00269 U3

Den plane væg 10 er fortrinsvis placeret grænsende op til venti la-ti on s kammeret s frontkanter, og røggastransportøren 8 er åben på et sted, der svarer til ventilationskammerets indsugningsåbning.The planar wall 10 is preferably located adjacent to the front edges of the venti-ti on the chamber, and the flue gas conveyor 8 is open at a location corresponding to the inlet opening of the ventilation chamber.

Røggastransportøren 8 kan på fordelagtig vis gives en i hovedsagen konisk udformning fra indsugningsåbningen 11 for gasserne, der kommer fra opvarmningskammeret, i en retning, der er modsat indsugningsåbningen; fordelen ved denne løsning ligger i det faktum, at den progressive reduktion i mængden af den opvarmede gasstrøm, som suges ind, kræver en tilsvarende reduktion i ledningsdimensionerne, idet gasstrømmen er udsat for en mangel på trykligevægt og en uregelmæssig gasindsugningsvirkning; herved tillades også en mere effektiv cirkulation over transportøren til nedkøling deraf.The flue gas conveyor 8 can advantageously be given a generally tapered configuration from the suction opening 11 of the gases coming from the heating chamber in a direction opposite to the suction opening; the advantage of this solution lies in the fact that the progressive reduction in the amount of heated gas flow sucked in requires a corresponding reduction in the conduit dimensions, the gas flow being exposed to a lack of pressure weight and an irregular gas suction effect; thereby also allowing a more efficient circulation over the conveyor for cooling thereof.

Med kendskab til den foreliggende opfindelses basale lære er det naturligvis muligt at designe ovne med en flerhed af indsugningsvægge 13, 14 og en enkelt røggastransportør med tilsvarende opvarmningskammer, som vist i fig. 4 og 5, ligesom det i forbindelse med et enkelt bagerum er muligt at tilvejebringe en flerhed af opvarmningskamre 16, 17, respektive røggastransportører 19, 20 og respektive ventilationskamre 21, 22.With knowledge of the basic teachings of the present invention, it is of course possible to design furnaces with a plurality of intake walls 13, 14 and a single flue gas conveyor with corresponding heating chamber, as shown in FIG. 4 and 5, and in connection with a single baking room it is possible to provide a plurality of heating chambers 16, 17, respective flue gas conveyors 19, 20 and respective ventilation chambers 21, 22.

Det skal bemærkes, at fordelene i overensstemmelse med opfindelsen efter behov kan opnås i konvektionsovne med de mest forskelligartede indre lodrette dimensioner. Dette gør det muligt at opretholde ovnens driftsniveauer uafhængigt af dens kapacitet og antallet af pander, der er anbragt deri.It should be noted that the advantages according to the invention can be obtained as needed in convection ovens with the most diverse internal vertical dimensions. This makes it possible to maintain the furnace's operating levels regardless of its capacity and the number of pans placed therein.

Det skal bemærkes yderligere, at konvektionsovnen ifølge opfindelsen kan have en dybde, som på fordelagtig vis er reduceret i forhold til de konventionelle konstruktioner. Dette er i kraft af, at de blæserdrivende motorer uden behov for passende transmissionsmidler kan anbringes uden for den øvre væg af huset, der indeholder blæserne, dvs i et område, som normalt ikke medfører nogen problemer med hensyn til de samlede dimensioner.It should be further noted that the convection oven according to the invention may have a depth which is advantageously reduced in comparison with the conventional structures. This is due to the fact that the blower motors without the need for suitable transmission means can be placed outside the upper wall of the housing containing the blowers, i.e. in an area which normally does not cause any problems with regard to the overall dimensions.

Ovnen er selvfølgelig forsynet med talrige andre anordninger, som ikke er beskrevet heri, da de ikke er relevante for formålene med denne ansøgning.Of course, the furnace is provided with numerous other devices which are not described herein as they are not relevant to the purposes of this application.

7 DK 96 00269 U37 DK 96 00269 U3

Selvom opfindelsen er blevet beskrevet under henvisning til den foretrukne udførelsesform og under anvendelse af almindelig kendt terminologi, betragtes den ikke som værende begrænset dertil, idet en fagmand kan udføre talrige variationer og modifikationer med hensyn til struktur og form.Although the invention has been described with reference to the preferred embodiment and using generally known terminology, it is not considered to be limited thereto, as one skilled in the art can make numerous variations and modifications in structure and form.

Claims

A forced convection oven, comprising a baking room, a flue gas conveyor and a heating chamber with suitable heating means which are substantially interconnected, which heating chamber is flowed and heated by ambient air drawn in by blowing agents arranged in a ventilation chamber, which blowing means can produce circulation in a substantially closed circuit formed by said baking compartment, said flue gas conveyor and said ventilation chamber, of a flow of gases in heat exchange relationship with said heating chamber provided with a pipe for discharging the combustion gases, and a possible plurality of pans placed vertical in said baking space, wherein said flue gas conveyor is substantially contained in said ventilation chamber and is directly overflowed, at least on both the horizontal surfaces, by the gas stream circulating in said ventilation chamber.

Ventilated furnace according to claim 1 and comprising an exhaust pipe for combustion gases being evacuated and vapors produced in said baking room, and KENDETGNET by said flue gas pipe for evacuation of hot gases and said combustion gas discharge pipe being evacuated, and steam is two completely separate wires without a common flow path.

Ventilated furnace according to claim 2, characterized in that said flue gas conveyor is terminated in the direction of the flow of gas passing through with an annular gap, one side of which is opposite to the baking space is at least partially open to said the interior of the ventilation chamber such that the gas flowing through said suction chamber is conducted with at least a partially annular geometry towards the suction edges of said blower means.

Ventilated furnace according to any one of claims 1, 2 or 3, characterized in that said ventilation chamber is arranged on the vertical end wall of said ventilated furnace, said flue gas conveyor is arranged substantially above said ventilation chamber and that it is provided. drainage means which, on the one hand, separate said baking space, and on the other, said DK 96 00269 U3 flue gas conveyor and said ventilation chamber, said separating means being open at a location corresponding to the suction opening of said ventilation chamber.

Ventilated furnace according to claim 4, characterized in that said drainage means comprise a substantially vertical, flat wall and said wall is arranged substantially adjacent to the front edges of said ventilation chamber and said flue gas conveyor.

Ventilated furnace according to any one of the preceding claims, characterized in that said heating chamber is arranged laterally with respect to said flue gas conveyor, seen in a front view of said suction chamber.

Ventilated furnace according to any one of the preceding claims, characterized in that said flue gas conveyor is formed with a generally tapered configuration from the suction opening of the gases of said heating chamber in a direction opposite to said suction opening. 20

Ventilated furnace according to any one of the preceding claims, characterized in that said heating means comprise at least one gas burner disposed in a lower position relative to the suction opening communicating between said heating chamber and said flue gas conveyor.

Ventilated furnace according to any one of the preceding claims, characterized in that the ventilation chambers are in a number of two and are superimposed on top of each other, that the flue gas conveyor is arranged in the space between said two ventilation chambers and said smoke gas conveyor is completed. in the direction of the gas flow therethrough, with two separate annular slots, one side of which is opposite said baking chamber, is at least partially open to the interior of the corresponding ventilation chamber, whereby the gas passing through said annular slots is fed with at least partially annular geometry against the inlet edges of said respective ventilation chambers. DK 96 00269 U3

Ventilated furnace according to any one of claims 1-8, characterized in that a plurality of heating chambers, flue gas conveyors and ventilation chambers are arranged in connection with a single baking room.