EP1321720B1 - Dispositif d' échangeur de chaleur - Google Patents

Dispositif d' échangeur de chaleur Download PDF

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Publication number
EP1321720B1
EP1321720B1 EP02021225A EP02021225A EP1321720B1 EP 1321720 B1 EP1321720 B1 EP 1321720B1 EP 02021225 A EP02021225 A EP 02021225A EP 02021225 A EP02021225 A EP 02021225A EP 1321720 B1 EP1321720 B1 EP 1321720B1
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EP
European Patent Office
Prior art keywords
burner
heat exchanger
gas
heat
combustion chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02021225A
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German (de)
English (en)
Other versions
EP1321720A1 (fr
Inventor
Lutz Riefenstein
Gerd Gumienny
Stan Smits
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Welbilt Deutschland GmbH
Original Assignee
Convotherm Elektrogeraete GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Convotherm Elektrogeraete GmbH filed Critical Convotherm Elektrogeraete GmbH
Publication of EP1321720A1 publication Critical patent/EP1321720A1/fr
Application granted granted Critical
Publication of EP1321720B1 publication Critical patent/EP1321720B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation

Definitions

  • Heat exchanger device for gas-fired devices for Heat treatment of food, with a fan for the forced circulation of a treatment medium, a Gas burner and a heat exchanger tube surrounding the fan wheel, the burner being exclusively with a mixing device for gas and combustion air for adjusting the for combustion necessary gas-air mixture in conjunction stands and wherein the mixing device is a control device for the setting of the one hundred percent premixed Gas-air mixture and a blower comprising the gas-air mixture into the burner and after combustion in the gas-tight connected to the burner heat exchanger tube under pressure.
  • a known heat exchanger device in the manner of a Bunsen burner formed and includes a Venturi tube in which from a Gas nozzle is blown gas, due to the distance entrained air between the Venturi tube and the gas nozzle will, so some premix of air and gas entry.
  • the burner is arranged in front of the heat exchanger tube, so that the burner leaving relatively long trained flame penetrates into the heat exchanger tube while still sucking in secondary air.
  • the arrangement of the burner in the Way that for the relatively long flame one possible long rectilinear heat exchanger tube available requires, in connection with the formation of an air chamber with raised air pressure for feeding the primary and secondary combustion air, the arrangement of the Burner with a relatively large distance to the fan, so that the hottest point of the heat exchanger device, in the burner flame is not directly next to it the fan is, but that this part of the heat exchanger device not directly impacted by the medium flow the fan wheel is generated.
  • a heat exchanger device of the type described above is known from EP 1 116 920 A2.
  • a gas burner which consists of a rectangular ceramic plate with a large number of holes through which the hundred percent premixed passes Gas-air mixture forced through the blower and ignited at the end of these openings.
  • This Burner is arranged in a combustion chamber, of which after each lateral direction, essentially tangential to one Fan wheel for the circulation of the treatment medium a heat exchanger tube goes out, the fan wheel substantially surrounds along half a circumference and in one Loop is returned again. Both tubes end in one Collector from which a discharge pipe leads to the outside.
  • a disadvantage of this design is the fact that the Burner is designed as a rectangular surface, which at a Increasing the burner output increased accordingly must be, which leads to space problems in a cooking appliance, because this type of burner has a relatively large combustion chamber requires. To keep the heat reasonably even to be able to discharge from this burner chamber are each other opposite arranged heat exchanger tubes required, which require an increased design effort. Furthermore it is not ensured that the flow in both heat exchanger tube sections, in the opposite direction be flowed through, uniformly precipitates, these uneven Actuation of the individual heat exchanger sections also negatively influenced by manufacturing tolerances becomes. The flames from the ceramic plate serving as a burner flow into the combustion chamber in which the hot gas is due the described pipe arrangement in two directions is split.
  • the object of the invention is a structurally simple heat exchanger device with a high thermal output too create.
  • This object is based on a heat exchanger device the type explained above according to the invention thereby solved that the burner as a closed at the end Tube formed with circumferentially distributed gas outlet openings is that a diameter-extended starting area the heat exchanger tube as a combustion chamber for recording the burner essentially serves the combustion chamber in the tangential direction to the fan in the immediate Near the same is arranged and that the heat exchanger tube the fan wheel, starting from the combustion chamber to the Outlet wraps steadily in the same gas flow direction.
  • the decisive factor in this embodiment is the Fact that the training of the burner as one end sealed tube with circumferentially arranged outlet openings the number of openings on the curved Pipe surface is larger than in the rectangular two-dimensional Design of the burner according to the state of the Technology.
  • An increase in the number of gas outlets can either by a slight increase in the Diameter, but in particular by an extension of the Tube can be achieved, which does not change the installation conditions, because the fan a relatively large Diameter, so that a very long burner training is possible, the one combustion chamber with only one heat exchanger tube allows, so the design effort can be significantly reduced.
  • the use of the starting area of the heat exchanger tube in expanded form as a combustion chamber brings the advantage with that, a particularly large surface of the hottest Area of the heat exchanger device is created, whereby the efficiency of the heat exchanger device improved becomes. Due to the arrangement of the combustion chamber in tangential Direction to the fan in the immediate vicinity of the same, the best possible heat utilization is achieved. The hot combustion chamber is thus in the immediate vicinity of the Fan wheel which not only promotes heat exchange, but also the combustion chamber in a sufficient manner is cooled. Because the fan is a relatively large Diameter, so there is the possibility of a long Formation of the combustion chamber and thus a long burner training.
  • the combustion chamber of at least a portion of the heat exchanger tube on the radially outer side relative to the fan is spanned, so is remote from the fan wheel Side of the combustion chamber, which is a very high temperature has, this already more cooled section of the Heat exchanger tube heated again, so a better Utilization of the generated heat takes place.
  • the heat exchanger tube the fan and the burner chamber several times wraps around, with at least one subsequent wrap at least opposite to a previous wrap in sections, a greater radial distance to Having fan wheel, so this is a special good use of the fan wheel receiving space in the Gargo achieved because the heat exchanger tube substantially in the manner of a spiral, that is, at least in sections, with increasing distance from the fan wheel axis around the Fan wheel and the combustion chamber is wrapped around and thus a very good space utilization can be achieved.
  • the burner chamber is L-shaped, with the short Leg at its free open end an opening in one Surrounds wall of the device for heat treatment and on the wall is fastened and that the long leg is tangential is arranged to the fan. If then the burner together with a part of a feed pipe for the finished Gas-air mixture of a burner chamber adapted L-shaped Form assembly and in the wall of the device for heat treatment is fixed, so this is particularly simple Way of ensuring the assembly of the burner in the burner chamber.
  • the heat exchanger device only two attachment points on the device for heat treatment, of which the one attachment point between a wall in the cooking appliance and Burner chamber and the second attachment point between the from the device for heat treatment exiting end the heat exchanger tube and a housing wall of the device is formed for heat treatment, so is the heat exchange device capable of occurring during operation Perform thermal expansion largely stress-free. Especially It is advantageous if the attachment points in are arranged close to each other, whereby the entire heat exchanger device almost unrestricted the can occur occurring thermal expansion.
  • the axes of the gas outlet openings are preferably vertical to the burner longitudinal axis, which despite the arrangement of many Gas outlet openings and the associated training many flames do not interfere with each other's flames entry. But there may be spatial conditions, that make another flame training necessary, so that it can also be advantageous if the axes of the gas outlet openings in the flow direction at an acute angle are inclined obliquely to the burner axis.
  • the device for heat treatment of food hereinafter called cooking appliance, has a housing 1, which except the usual, not shown front panel and Door, a partition wall 2, which has the housing in close proximity divided into separate rooms.
  • a room 4 of a room. 5 separated.
  • the space 4 serves to receive a fan wheel 6 and a heat exchange device 7, while the space 5 as a cooking space for receiving the food to be treated serves.
  • the room 4 is by a not shown Steam generator introduced steam, leaving a steam-air mixture arises, which by the fan 6 accordingly the arrows 8 through slots 9 and 10 in the partition wall 3 in the cooking chamber is blown. This is the vapor-air mixture through the total designated 7 heat exchanger device heated.
  • the bottom 11 of the cooking chamber. 5 opens into a drain 12, the condensate drain and as Outlet for grease and cleaning fluids used.
  • This Drain opens into a mixing capacitor 13, which is used to deposit the effluent vapor serves and its drain line denoted by 14.
  • control and regulation elements In the hermetically separated by the partition wall 2 space 15 are located next to not shown control and regulation elements a drive motor 16 for the fan 6 and a Mixing device 17 for a gas-powered burner 18th the heat exchanger device 7.
  • the heat exchanger device 7 comprises in addition to the already mentioned burner 18, which with a feed tube 19 with the mixing device 17 is also connected to a combustion chamber 20, which is followed by a heat exchanger tube 21, which not only the fan 6 but also the combustion chamber 20 wraps around, with the distance of the individual Pipe sections from the center of the impeller 6 with each wrap increased.
  • the combustion chamber 20 is located in the immediate vicinity Neighborhood in the tangential direction to the fan 6 and is L-shaped.
  • the shorter leg 20a is by means of a flange attached to the partition wall 2 and surrounds an opening 23 in the partition 2.
  • the longer leg 20b takes the burner 18, which designed over the L-shaped Supply pipe 19 connected to the mixing device 17 is.
  • the heat exchanger tube 21 is at its one end by means of a transition piece 24 with the combustion chamber 20th connected and at its other end by means of a flange 25 attached to a housing wall, said attachment point near the flange 22 and thus in the Near the attachment point of the combustion chamber is located.
  • these two attachment points a relatively small distance from each other on, so that the whole heat exchanger tube free of Attachment points is and thus at the incoming thermal expansion no obstructions due to additional attachment points subject.
  • the mixing device 17 comprises a not shown in detail Blower and dosing with appropriate control devices for the adjustment of the necessary for combustion Gas-air mixture, which in the for the Combustion necessary ratio supplied to the burner 18 is, so completely or one hundred percent premixed is. An additional supply of secondary air occurs not here, which is favorable to the noise makes noticeable.
  • the burner 18 comprises a tube with a closed end 26, which is about half of the Length of the combustion chamber 20 has.
  • On the circumference of the burner openings 27 are provided, from which the gas-air mixture exit and after appropriate inflammation several adjacent flames 28 forms.
  • the axes 29 of the openings 27 can also be in the flow direction of the gas at an acute angle be inclined in front.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Power Steering Mechanism (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Baking, Grill, Roasting (AREA)
  • Commercial Cooking Devices (AREA)

Claims (9)

  1. Dispositif d'échangeur de chaleur pour des dispositifs chauffés au gaz de traitement thermique de produits alimentaires, comportant une hélice (6) pour la ventilation forcée d'un milieu de traitement, un brûleur à gaz (18) et un tuyau d'échangeur de chaleur (21) entourant l'hélice, dans lequel le brûleur (18) est exclusivement relié à un dispositif de mélange (17) du gaz et de l'air de combustion afin d'établir le mélange gaz-air nécessaire à la combustion et dans lequel le dispositif de mélange (17) comprend un dispositif de régulation pour mettre au point le mélange gaz-air prémélangé à 100 % et un ventilateur, lequel, achemine sous pression le mélange gaz-air dans le brûleur (18) et, après une combustion réussie, dans le tuyau d'échangeur de chaleur (21) relié au brûleur de manière étanche au gaz, caractérisé en ce que le brûleur (18) est configuré comme un tuyau fermé à une extrémité (26), présentant des ouvertures d'échappement de gaz (27) réparties sur sa superficie, en ce q u'une port ion de début au diamètre élargi du tuyau d'échangeur de chaleur (21) sert de chambre de combustion (20) pour recevoir le brûleur (18), en ce que la chambre de combustion (20) est essentiellement disposée en direction tangentielle par rapport à l'hélice (6) à proximité immédiate de cette dernière et en ce que le tuyau d'échangeur de chaleur (21) encercle l'hélice (6) en partant de la chambre de combustion (20) jusqu'à l'échappement (25) en continu dans une direction d'écoulement de gaz toujours égale.
  2. Dispositif d'échangeur de chaleur selon la revendication 1, caractérisé en ce que la chambre de combustion (20) est distendue par au moins une section du tuyau d'échangeur de chaleur (21) sur le côté radialement extérieur par rapport à l'hélice (6).
  3. Dispositif d'échangeur de chaleur selon la revendication 1 ou 2, caractérisé en ce que le tuyau d'échangeur de chaleur (21) encercle en plusieurs tours l'hélice (6) et la chambre de combustion (20), moyennant quoi au moins un cerclage suivant présente par rapport à un cerclage précédent au moins sur des sections une distance radiale plus grande par rapport à l'axe de l'hélice.
  4. Dispositif d'échangeur de chaleur selon une des revendications 1 à 3, caractérisé en ce que la chambre de combustion (20) est configurée en forme de L, le pan court (20a) entoure à son extrémité libre ouverte une ouverture (23) dans une paroi (2) du dispositif de traitement thermique et est fixé (22) sur la paroi (2) et le pan long (20b) est disposé tangentiellement par rapport à l'hélice (6).
  5. Dispositif d'échangeur de chaleur selon la revendication 4, caractérisé en ce que le brûleur (18) forme conjointement avec une partie du tuyau d'introduction (19) du mélange gaz-air prêt une unité de structure en forme de L adaptée à la chambre de combustion (20) et est fixé dans l'ouverture (23) de la paroi (2) du dispositif de traitement thermique.
  6. Dispositif d'échangeur de chaleur selon une des revendications 1 à 5, caractérisé en ce qu'il présente uniquement deux emplacements de fixation (22,25) sur le dispositif de traitement thermique, l'un des emplacements de fixation (22) étant formé entre une paroi (2) dans l'app areil de cuisson et la chambre d e combustion (20) et le deuxième emplacement de fixation (25) étant formés entre l'extrémité du tuyau d'échangeur de chaleur (21) qui ressort du dispositif de traitement thermique et une paroi de logement du dispositif de traitement thermique.
  7. Dispositif d'échangeur de chaleur selon la revendication 6, caractérisé en ce que les emplacements de fixation (22,25) sont d isposés à proximité immédiate l'un de l'autre.
  8. Dispositif d'échangeur de chaleur selon une des revendications 1 à 7, caractérisé en ce que les axes (29) des ouvertures d'échappement de gaz (27) sont perpendiculaires à l'axe longitudinal du brûleur (30).
  9. Dispositif d'échangeur de chaleur selon une des revendications 1 à 7, caractérisé en ce que les axes (29) des ouvertures d'échappement de gaz (27) sont inclinés dans la direction d'écoulement à un angle aigu obliqu ement par rapport à l'axe longitudinal du brûleur (30).
EP02021225A 2001-12-20 2002-09-18 Dispositif d' échangeur de chaleur Expired - Lifetime EP1321720B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10162952A DE10162952C5 (de) 2001-12-20 2001-12-20 Wärmetauschereinrichtung
DE10162952 2001-12-20

Publications (2)

Publication Number Publication Date
EP1321720A1 EP1321720A1 (fr) 2003-06-25
EP1321720B1 true EP1321720B1 (fr) 2005-01-26

Family

ID=7710173

Family Applications (1)

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EP02021225A Expired - Lifetime EP1321720B1 (fr) 2001-12-20 2002-09-18 Dispositif d' échangeur de chaleur

Country Status (4)

Country Link
EP (1) EP1321720B1 (fr)
AT (1) ATE288053T1 (fr)
DE (2) DE10162952C5 (fr)
ES (1) ES2199704T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012015312A1 (de) 2012-08-02 2014-02-06 Labetherm Ltd. Wärmetauscher-Systeme für Gargeräte

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10162952C5 (de) * 2001-12-20 2007-05-16 Convotherm Elektrogeraete Wärmetauschereinrichtung
ITVI20020260A1 (it) * 2002-11-28 2004-05-29 Gierre Srl Forno a convenzione con bruciatore a fiamma radiale.
DE102008003562A1 (de) 2008-01-09 2009-07-16 Convotherm Elektrogeräte GmbH Gargutträger und Verwendung eines Gargutträgers
DE202008010227U1 (de) 2008-07-31 2009-12-10 Klouda, Jaroslav, Dipl.-Ing. Gasvormischbrenner und Wärmetauschersystem für Koch-, Gar- und andere thermische Geräte
DE102011017024A1 (de) 2010-04-14 2012-01-12 Jaroslav Klouda Heißluftwärmetauscher für Gargeräte beispielsweise Kombidämpfer, Back- und Grillgeräte
DE102012015313A1 (de) 2012-08-02 2014-02-20 Labetherm Ltd. Gasbeheizter Wärmetauscher mit Strömungs-Umlenkung und Geräusch-Dämpfer
DE102012016813A1 (de) 2012-08-24 2014-03-20 Labetherm Ltd. Gasbeheizter Wärmetauscher mit Strömungsumlenkung, Schall-Dämpfer und geradem Auslaufrohr
US9372005B2 (en) 2012-11-30 2016-06-21 Alto-Shaam, Inc. Heat exchanger for oven

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3901737A (en) * 1974-02-15 1975-08-26 Signetics Corp Method for forming a semiconductor structure having islands isolated by moats
IT1024113B (it) * 1974-05-18 1978-06-20 Zanussi Grandi Forro a convenzione forzata
US4867132A (en) * 1988-11-23 1989-09-19 Garland Commercial Industries, Inc. Gas fired convection oven with improved air delivery and heat exchange structure
IT1253697B (it) * 1991-08-05 1995-08-22 Zanussi Grandi Impianti Spa Forno di cottura a gas a convezione forzata.
NL1014044C2 (nl) * 2000-01-10 2001-07-19 Levens Group B V Door gasbrander verwarmde oven.
DE10162952C5 (de) * 2001-12-20 2007-05-16 Convotherm Elektrogeraete Wärmetauschereinrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012015312A1 (de) 2012-08-02 2014-02-06 Labetherm Ltd. Wärmetauscher-Systeme für Gargeräte

Also Published As

Publication number Publication date
DE10162952C2 (de) 2003-11-06
DE50202105D1 (de) 2005-03-03
ES2199704T3 (es) 2005-07-01
ES2199704T1 (es) 2004-03-01
ATE288053T1 (de) 2005-02-15
DE10162952C5 (de) 2007-05-16
DE10162952A1 (de) 2003-07-10
EP1321720A1 (fr) 2003-06-25

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