EP0706014A1 - Ecran de protection contre la chaleur pour échangeur de chaleur - Google Patents

Ecran de protection contre la chaleur pour échangeur de chaleur Download PDF

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Publication number
EP0706014A1
EP0706014A1 EP95111715A EP95111715A EP0706014A1 EP 0706014 A1 EP0706014 A1 EP 0706014A1 EP 95111715 A EP95111715 A EP 95111715A EP 95111715 A EP95111715 A EP 95111715A EP 0706014 A1 EP0706014 A1 EP 0706014A1
Authority
EP
European Patent Office
Prior art keywords
heat
protection shield
heat protection
heat exchanger
shield according
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.)
Granted
Application number
EP95111715A
Other languages
German (de)
English (en)
Other versions
EP0706014B1 (fr
Inventor
Marco Culzoni
Claudio Bassoli
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.)
Angelo Po Grandi Cucine SpA
Original Assignee
Angelo Po Grandi Cucine SpA
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
Application filed by Angelo Po Grandi Cucine SpA filed Critical Angelo Po Grandi Cucine SpA
Publication of EP0706014A1 publication Critical patent/EP0706014A1/fr
Application granted granted Critical
Publication of EP0706014B1 publication Critical patent/EP0706014B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

Definitions

  • the invention relates to a heat shield for heat exchangers with at least one burner chamber into which the open ends of heat exchanger tubes open, openings being provided in the heat shield at the points at which the heat exchanger tubes open into the burner chamber.
  • Such a heat shield is used, for example, in a burner chamber of a gas-fired kitchen range.
  • the structure of such a range is described, for example, in EP-A-551 807.
  • the kitchen stove described there has an oven space through which the heat exchanger tubes pass.
  • the open ends of these heat exchanger tubes open into a burner chamber arranged below the furnace chamber. Gas burners are arranged in the burner chamber, the hot combustion gases of which are passed through the heat exchanger tubes.
  • EP-A-551 807 proposes that a plurality of interspaces be formed between the burner chamber and the furnace space, one of which is filled with heat-insulating material. In the second space end connecting pieces which are slidably inserted into the open ends of the heat exchanger tubes.
  • the object of the present invention is to provide heat protection shields for heat exchangers of the type specified at the outset, in which heat-related tensions can largely be reduced.
  • this object is achieved in the case of a generic heat shield by the features of the characterizing part of claim 1. Accordingly, the heat shield is not connected to the walls of the burner chamber and there are separating cuts or dividing lines within the heat shield that at least partially separate the areas around the respective openings. As a result, heat-related stresses in the heat protection shields directly affected by the burner flames are more easily reduced.
  • separating cuts can be provided in the heat shield between the individual openings in such a way that the heat-related deformations of the heat shield are eliminated or reduced.
  • the separating cuts can run around the respective entire opening, so that the regions of the heat protection shield surrounding the opening form separate plates.
  • edge of these separate plates can be shaped such that they overlap when assembled.
  • the corresponding edge areas each form shoulders such that correspondingly overlapping edge areas of the following plate can rest on them.
  • the plates of the heat protection shield which are not connected to one another can be suspended separately from one another.
  • the individual panels can form one level when assembled.
  • the individual plates can be suspended from the respective heat exchanger tubes to which their openings belong.
  • the individual plates, which are suspended from the respective heat exchanger tubes are conically shaped, so that they protrude like a lampshade into the burner chamber.
  • the heat protection shield can consist of two shields lying one on top of the other, but which have the features according to the invention as such.
  • the heat protection shield advantageously consists of refractory material, such as refractory ceramic.
  • connecting pipes can be attached to the edge of the openings arranged in the heat shield.
  • these connecting pipes are basically aligned coaxially with the respective heat exchanger pipes.
  • the connection to the respective heat exchanger tubes can be made in different ways.
  • the connecting tube can be inserted into the associated heat exchanger tube in the assembled position, the Connection tube with its outer wall rests against the inner wall of the heat exchanger tube, but its longitudinal displaceability in the heat exchanger tube remains guaranteed.
  • the connecting pipe and the end of the associated heat exchanger pipe can also have the same diameter and be arranged separately from one another, both of which are surrounded by a corresponding sleeve pipe, which thus forms the connection between the two pipes.
  • Either the connecting pipe or the end of the associated heat exchanger pipe or both can also be mounted in a longitudinally displaceable manner in the sleeve pipe.
  • the connecting pipe can lie in the assembled state in the respectively assigned heat exchanger pipe, forming an annular gap between the outer surface of the connecting pipe and the inner surface of the heat exchanger pipe.
  • a further alternative embodiment can consist in that the connecting pipe has a larger diameter than the heat exchanger pipe and is therefore outside the end of the respectively assigned heat exchanger pipe.
  • An annular gap is then also formed here, which, however, extends between the outer circumference of the heat exchanger tube and the inner circumference of the connecting tube.
  • the connecting pipes can be positioned both above the heat shield and below the heat shield, each in relation to the position of the burner.
  • the heat shield according to the invention can be used not only in kitchen stoves, but also in general in the burner chambers of boilers or, for example, in gas-heated hotplates.
  • FIG. 4 shows a burner chamber 10 with side walls 12 and a cover 14, in which gas burners 16 (here indicated by a horizontal line) are arranged.
  • gas burners 16 here indicated by a horizontal line
  • the open ends of heat exchanger tubes open into the burner chamber 10.
  • the heat exchanger tubes can be extended by appropriate connecting tubes 18, as are realized here.
  • a heat protection shield 20, which consists of refractory ceramic, is arranged in each case in the burner chamber.
  • FIG. 1 a first embodiment of the heat protection shield 20 according to the invention is explained. Inside the burner chamber, 1, the cover 14 and the side walls 12 are shown, two heat shields 20 are hung next to each other. As can be seen in FIG. 1, the heat shields 20 are not connected to the walls 12 of the burner chamber 10, so that they can expand freely to the side when heated accordingly.
  • One of the heat protection shields has five openings 22 through which the free ends of heat exchanger tubes or of connecting tubes for the heat exchanger tubes can be pushed through. In addition, the free ends can also end between the cover plate 14 and the heat protection shield 20 without passing through the openings 22 of the heat protection shields 20.
  • Separating cuts 24 are made between the individual openings 22 within the heat protection shields 20. The separating cuts in this embodiment are each formed as a tangent to the circular openings. These cuts ensure that heat-related tensions within the heat shield can be reduced more easily.
  • the embodiment according to FIG. 2 largely corresponds to that according to FIG. 1, but here not only individual separating cuts or separating lines are provided between the individual openings. Rather, the heat protection shields 20 are divided into individual separate plates 26, which each extend around the openings 22 and are separated from one another by dividing lines 28. 4 shows the associated cross section to the embodiment according to FIG. 2. It follows from this that the individual plates 26 each rest on flange-shaped edges 30 of the connecting pipes 18. The connecting pipes 18 are each welded to a plate 32. The transition to the heat exchanger tubes, which are not shown here, takes place in one of the examples according to FIGS. 6-9, which will be explained later.
  • FIG. 5 A modification of the heat shield 20 according to the embodiment according to FIG. 4 is shown in the embodiment according to FIG. 5.
  • the heat protection shield 20 was assembled on the individual plates 26, which extend in one plane, in the embodiment according to FIG. 5 the individual plates 26 are conical and thus funnel-shaped. As shown in FIG. 5, when these individual plates 26 are attached here like lampshades to the respective ends of the connecting tubes 18.
  • the heat shield 20 can also serve as a cover 14 of the burner chamber 10.
  • the respective heat protection shield likewise consists of individual plates 26, which here, however, have shoulders in their edge region which, as shown in FIG. 3, each overlap and thus support one another.
  • FIGS. 6, 2, 4 and 5 show examples of how the heat exchanger tubes open into the burner chamber.
  • the heat shield 20 simultaneously forms the cover of the burner chamber 10.
  • the heat shield could also be moved into the burner chamber, as described, for example, using the exemplary embodiments according to FIGS. 1, 2, 4 and 5.
  • a connecting tube 18 is attached to the plate 26 of the heat protection shield 20.
  • This connecting pipe 18 is aligned coaxially with a heat exchanger pipe 32, the free end of which is approximately at the bottom 34 of the furnace chamber.
  • the opening of the furnace chamber floor 34 receiving the heat exchanger tube 32 is bent over at the edge, as is shown in more detail in FIG. 6a).
  • the connecting pipe 18 is inserted into the heat exchanger pipe 32, the outer diameter of the connecting pipe 18 corresponding approximately to the inner diameter of the heat exchanger pipe 32.
  • the respective diameters of the tubes 18 and 32 are matched to one another such that the connecting tube 18 is located within the heat exchanger tube 32, for example in the case of thermal expansion.
  • the connecting pipe has the same diameter as the heat exchanger pipe 32.
  • a gap is left between the two coaxially arranged pipe sections. This is bridged by a sleeve pipe 36 which is welded to the bent edge of the furnace floor 34.
  • the connecting pipe 18 has a smaller diameter than the heat exchanger pipe 32.
  • the diameter of the connecting tube 18, which projects into the open end of the heat exchanger tube 32 is dimensioned here so small that an annular gap remains between the outer diameter of the connecting tube 18 and the heat exchanger tube 32.
  • FIG. 8 largely corresponds to that according to FIG. 6b).
  • a sleeve pipe 36 is also arranged here.
  • the diameter of the connecting pipe 18 is chosen larger than the outer diameter of the heat exchanger pipe 32 or the sleeve pipe 36 surrounding it at the end. The difference in diameter is chosen such that an annular gap remains between the outer diameter of the sleeve pipe 36 and the inner diameter of the connecting pipe 18 , as shown in Fig. 8.
  • the heat protection shield is formed from two superimposed shields which correspond, for example, to the embodiment according to FIG. 1.
  • the connecting pipes 18 form an integral structural unit with the heat protection shield 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
  • Details Of Fluid Heaters (AREA)
EP95111715A 1994-10-07 1995-07-25 Ecran de protection thermique pour échangeur de chaleur Expired - Lifetime EP0706014B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9416203U DE9416203U1 (de) 1994-10-07 1994-10-07 Hitzeschutzschild für Wärmetauscher
DE9416203U 1994-10-07

Publications (2)

Publication Number Publication Date
EP0706014A1 true EP0706014A1 (fr) 1996-04-10
EP0706014B1 EP0706014B1 (fr) 1999-10-20

Family

ID=6914635

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95111715A Expired - Lifetime EP0706014B1 (fr) 1994-10-07 1995-07-25 Ecran de protection thermique pour échangeur de chaleur

Country Status (6)

Country Link
EP (1) EP0706014B1 (fr)
AT (1) ATE185890T1 (fr)
DE (2) DE9416203U1 (fr)
DK (1) DK0706014T3 (fr)
ES (1) ES2138689T3 (fr)
GR (1) GR3032448T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9372005B2 (en) 2012-11-30 2016-06-21 Alto-Shaam, Inc. Heat exchanger for oven

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3707186A (en) * 1971-01-18 1972-12-26 Foster Wheeler Corp Cooling tube ferrule
DD239465A1 (de) * 1985-07-18 1986-09-24 Kali Veb K Vorrichtung zur verschleissminderung suspensionsdurchstroemter rohrbuendelwaermeaustauscher
FR2661244A1 (fr) * 1990-04-19 1991-10-25 Olifan Vibracim Sa Embout de protection pour tube de chaudiere et son procede de fabrication.
EP0551807A1 (fr) 1992-01-08 1993-07-21 Lainox S.R.L. Four de cuisson d'aliments à convection forcée.
EP0567674A1 (fr) * 1992-04-29 1993-11-03 Deutsche Babcock-Borsig Aktiengesellschaft Echangeur de chaleur pour le refroidissement du gaz de synthèse produit dans une installation de gazéification du charbon
EP0599103A1 (fr) * 1992-11-26 1994-06-01 Wiesheu-Wiwa GmbH Echangeur de chaleur avec un chauffage à flammes

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3707186A (en) * 1971-01-18 1972-12-26 Foster Wheeler Corp Cooling tube ferrule
DD239465A1 (de) * 1985-07-18 1986-09-24 Kali Veb K Vorrichtung zur verschleissminderung suspensionsdurchstroemter rohrbuendelwaermeaustauscher
FR2661244A1 (fr) * 1990-04-19 1991-10-25 Olifan Vibracim Sa Embout de protection pour tube de chaudiere et son procede de fabrication.
EP0551807A1 (fr) 1992-01-08 1993-07-21 Lainox S.R.L. Four de cuisson d'aliments à convection forcée.
EP0567674A1 (fr) * 1992-04-29 1993-11-03 Deutsche Babcock-Borsig Aktiengesellschaft Echangeur de chaleur pour le refroidissement du gaz de synthèse produit dans une installation de gazéification du charbon
EP0599103A1 (fr) * 1992-11-26 1994-06-01 Wiesheu-Wiwa GmbH Echangeur de chaleur avec un chauffage à flammes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9372005B2 (en) 2012-11-30 2016-06-21 Alto-Shaam, Inc. Heat exchanger for oven

Also Published As

Publication number Publication date
ES2138689T3 (es) 2000-01-16
ATE185890T1 (de) 1999-11-15
DE9416203U1 (de) 1994-12-01
EP0706014B1 (fr) 1999-10-20
GR3032448T3 (en) 2000-05-31
DE59507088D1 (de) 1999-11-25
DK0706014T3 (da) 2000-01-03

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