EP0816777B1 - Procédé de fabrication d'une chambre de combustion, spécialement pour chauffe-eau à gaz, et chambre de combustion fabriquée selon ce procédé - Google Patents

Procédé de fabrication d'une chambre de combustion, spécialement pour chauffe-eau à gaz, et chambre de combustion fabriquée selon ce procédé Download PDF

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Publication number
EP0816777B1
EP0816777B1 EP19970109618 EP97109618A EP0816777B1 EP 0816777 B1 EP0816777 B1 EP 0816777B1 EP 19970109618 EP19970109618 EP 19970109618 EP 97109618 A EP97109618 A EP 97109618A EP 0816777 B1 EP0816777 B1 EP 0816777B1
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EP
European Patent Office
Prior art keywords
combustion chamber
wall
weld seams
ducts
wall panels
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
EP19970109618
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German (de)
English (en)
Other versions
EP0816777A3 (fr
EP0816777A2 (fr
Inventor
Heinz Ehrle
Ernst Schmidt
Hans-Ulrich Lenckner
Josef Reitstaetter
Hans-Jochen Schwarz
Michael Dinkelacker
Guenther Mayer
Hans-Joachim Braun
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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
Priority claimed from DE19722289A external-priority patent/DE19722289A1/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0816777A2 publication Critical patent/EP0816777A2/fr
Publication of EP0816777A3 publication Critical patent/EP0816777A3/fr
Application granted granted Critical
Publication of EP0816777B1 publication Critical patent/EP0816777B1/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
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
    • F24H1/124—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/24—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/44—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with combinations of two or more of the types covered by groups F24H1/24 - F24H1/40 , e.g. boilers having a combination of features covered by F24H1/24 - F24H1/40

Definitions

  • the invention is based on a method of manufacture a combustion chamber according to the preamble of claim 1 and one Combustion chamber for gas-fired Water heater according to the preamble of claim 13.
  • WO 92/20976 A1 describes a method for producing a Combustion chamber known, the walls of which are two together welded wall plates exist, the channels after welding the wall panels along the later channel edges by shaping the between the welds themselves located sheet metal areas by means of a pressure between the wall sheets introduced fluid working fluid formed become.
  • the recesses of the inner tool open out immediately in front of the corners in excess to accommodate Recessed pockets for materials. This will make one Stiffening achieves greater stability contributes when a heat exchanger for water to be heated is mounted on the combustion chamber. In addition, one Counteracted wrinkling of the inner wall plate.
  • the weld seams connecting the wall panels are used in the Manufacture of channels for the water-cooled combustion chamber in advantageously not directly between the inner and supported outer tool.
  • the welds as well as the adjacent sheet metal areas are thus at Making the channels stretched, reducing tensile strength increased, and the wall thickness of the sheet metal areas reduced becomes.
  • Working equipment can simply be one of the two wall plates welding to the other wall panel with an opening be provided, which can also be used to connect a Line for a fluid resource, in particular Heating water.
  • This opening is expedient in a dome-like Spreading of the wall plate is provided to reduce pressure losses in the flow of work equipment and operating supplies increases slightly hold.
  • the Wrinkles in the corners of the wall panels can also be counteracted if the weld seams like this be arranged that common chambers over the Extend corner areas of the wall panels.
  • the same purpose serves the proposal to offset the start of the individual channels to arrange each other.
  • the present invention further proposes that the Ends of the weld seams tapering in a circular line be carried out. This ensures that the Transition of the individual channels into the common chambers result in uniform, "pillow-shaped" widenings and therefore an impermissibly high stress on the material is avoided.
  • FIG. 1 shows a perspective view a combustion chamber for gas-fired water heaters with a lifted upwards as a slat block with passed through water pipes trained heat exchanger and one detachable with the side walls of the combustion chamber connectable front wall
  • Figure 2 on an enlarged scale a vertical section through the side wall of the Combustion chamber and a partial section through the attached Heat exchanger according to Figure 1
  • Figure 3 is a plan view one of two welded wall plates existing circuit board, which after welding to a die Rear wall and the two side walls of the combustion chamber forming the U-shaped part
  • Figure 4 is a enlarged section along the line IV in Figure 3
  • Figure 5 a cross section through a corner region of the combustion chamber, in the entrance area in front of the heat exchanger
  • 6 shows a cross section corresponding to FIG.
  • FIG. 5 an alternative corner area of the combustion chamber
  • Figure 7 is a plan view of a corner area of the Combustion chamber
  • Figure 8 is a partial section through a alternative design of the front wall
  • FIG. 9 and FIG. 10 Partial cuts through an inner and outer Tool existing device for receiving the U-shaped curved combustion chamber
  • Figure 11 is a stress-strain diagram.
  • the water heater has a combustion chamber (10) with a Rear wall (12) and two integrally connected to this Side walls (14, 16) on which a front wall (18) can be detached is attached.
  • the combustion chamber (10) is from above Heat exchanger (20) can be placed on it as a lamella block performed water pipes is formed.
  • the sidewalls (14, 16) of the combustion chamber (10) are with the upper front edge provided open recesses (22) to the fit Inclusion of protruding from the outer slats (24) Tube ends (26) ( Figure 2) of the heat exchanger (20) are used.
  • the crenellated between the recesses (22) Sections (28) of the side walls (14, 16) are with bead-shaped depressions (30) provided on the outer slats (24) fit without gaps and the Set the heat exchanger (20) without play.
  • the pipe ends (26) are connected to one another by caps (32a, b, c) also the connections (34, 36) of the heat exchanger (20) are provided.
  • the combustion chamber walls each consist of two together adjacent and welded wall plates (38.40) made of stainless steel, the molded sheet metal areas (42.44) have, between which a further below described channel system (46) for the combustion chamber (10) cooling heating water flow is formed.
  • the Channel system (46) is produced in that the Wall plates (38.40) initially still in their essence flat initial shape due to straight weld seams (48) be connected to each other and only then the duct system (46) by shaping the between the weld seams (48) located sheet metal areas (42, 44) by means of a Pressing pressure inserted between the wall plates (38.40) fluid working fluid is formed.
  • the channel system (46) in the rear wall (12) and Sidewalls (14, 16) is in accordance with the settlement of these Wall parts according to Figure 3 formed by one closed all-round weld seam (48a) and four straight weld seams (48b, c, d, e).
  • there are two individual channels (46a) in the side wall (14) connected to one another via a chamber (46b) are and opens into a chamber (46c).
  • Three of these lead parallel individual channels (46d) in the rear wall (12) further in a chamber (46e) which has two individual channels (46f) in the Sidewall (16) connected to an outer chamber (46g) is.
  • dome-like features (50) with openings (52) for inserting connecting pieces (54) are molded into the outer wall plate at the connection points of the duct system (46).
  • the front wall (18) is provided with connection elements (56).
  • the circuit board shown in FIG. 3 is bent into the U-shape according to FIG. 1 with a bending radius r 2 using a bending device (not shown ) .
  • the lines (58) drawn with dashed lines in FIG. 3 show the position and the limits of the corner regions which form, hereinafter referred to as bending zones (60).
  • the combustion chamber 10 After the combustion chamber 10 has been bent into a U shape, it is clamped into a device (FIG. 9) consisting of an inner (80) and an outer tool (82), the two bending zones (60) of the inner wall plate 40 being on the inner one Place the tool (80) on.
  • the bending radius of the inner tool (80) coincides with the bending radius r 2 of the inner wall plate (40).
  • recesses are formed between the inner wall plate (40) and the inner tool (80) and between the outer wall plate (38) and the outer tool (82) there are clearances for the duct system (46) to be produced.
  • the fluid working fluid for expanding the between the Weld seams (48) lying sheet metal areas (42,44) pressed between the wall plates (38.40), the to be formed sheet metal areas (42,44) in the recesses and the distances are pushed in.
  • Bending zones (60) are only the outer wall plate (38) deformed outside, while the inner wall plate (40) in this Area remains undeformed.
  • the outer tool (82) is in the bending zones (60) with a greater distance from the outside Provide wall plate (38). This can make it stronger Dimensions than in the stretched channel areas to the outside expand.
  • the device is in the outer tool (82) in the Bending zones (60) on a counterpart for limiting the outer wall plate (38) dispensed with because of a defined pressure supply the desired channel width a can be manufactured.
  • the weld seams (48) connecting the inner and outer wall plates (38, 40) to form the channel system (46) are deliberately not supported when the plate regions (42, 44) are expanded.
  • a tensile force is applied to the weld seams (48) and to the adjacent sheet metal areas and the material is stretched.
  • This stretching takes place as shown in the stress-strain diagram in FIG. 11, up to the plastic region with a permanent strain ⁇ r .
  • the line a shown in broken lines shows the stress-strain curve for the stretching method used, while line b represents a comparable curve curve without stretching.
  • the duct system (46) to be produced is based on a minimum flow cross section a min , which ensures adequate cooling of the combustion chamber (10). Therefore, the arrangement is such that the largest possible cooling of the combustion chamber (10), the channel width is selected both in the stretched channel area (sum of depth b and width c) and in the corner area (width a) so that the minimum flow cross section a min is observed.
  • the width a of the flow cross section in the Bending zones (60) equal to the sum of the depth b and the Width c selected in the stretched channel area.
  • the inside is Tool (80) next to the bending zones (60) locally provided recesses so that there are excess material (62) of the inner wall plate (40) can mold into it.
  • the inner tool (80) each with a trough-shaped depression to form a dome-shaped bulge of the inner wall plate (40) provided, whereby the flow resistance at the entrance and further reduced at the exit of the channel system (46).
  • the weld seams running between the individual channels (48) have circular ends (66), so the sheet metal material there when the individual channels are widened Bulge without pillows without the risk of cracking can.
  • the circle diameter of the ends (66) should not be smaller than 5 mm, but also not larger than 15 mm the consequent loss of more effective Keep heat transfer surface within reasonable limits. at a preferred embodiment was the circle diameter 12 mm selected. Wrinkling is also caused by the counteracted further measure that the ends (66) of the parallel channels (48c, d or 48g, h) offset to be arranged to each other.
  • the channel system (46) in the rear wall (12) extends up to the area overlapping the heat exchanger (20) and that there the wall plates (38, 40) in the bending zones (60) directly against one another issue.
  • the combustion chamber (10) has a corner radius r 1 of, for example, 5 mm in this upper region, which closely surrounds the heat exchanger (20), whereas in the corner regions of the combustion chamber (10) below, over which the chambers (46c, e) of the Extend channel system (46), the corner radius r 2 is dimensioned much larger and is, for example, 20 mm.
  • transition from one corner radius to the other is made without gaps in that the entire board, after it has been bent with the larger corner radius r 2 and is supported between the inner and outer tool, is stretched with the smaller corner radius r 1 by stretching the wall plates (38.40) is molded from the inside out.
  • the individual channels of the channel system (46) are through the Weld seams (48) immediately limited, so that at their Longitudinal edges (78) ( Figure 2) do not form any gaps in which corrosion products could deposit.
  • the welds (48) are in the practically still flat condition of the wall sheets (38.40), which makes manufacturing easier.
  • Through the detachable connections of the heat exchanger (20) and Front wall (18) of the other wall parts (12, 14, 16) of the Combustion chamber (10) will maintain and assemble the Heat exchanger (20), and the manufacture of the combustion chamber (10) relieved.
  • the connections (54, 56) of the duct system (46) are advantageously placed so that the channel system of is flowed through from the bottom up. This makes it possible Bleed the system more easily.
  • the heating efficiency can be improved when the heat transfer from heating gas to the combustion chamber wall by increasing the radiation number y increased due to oxidation or blackening of the inner surface becomes.
  • the front wall (68) shown in FIG. 8 consists of an outer wall plate (70) and one in parallel spacing arranged inner wall plate (72), which consists of a particularly temperature-resistant material.
  • inner wall plate (72) On the Inside of the wall plate (70) is preferably one shiny metallic radiation protection layer (74), optionally in the form of an additional sheet metal part, intended.
  • the between the two wall plates (70.72) formed space (76) goes through one Air flow, the heat absorbed there to the heat exchanger (20) transported.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (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)
  • Gas Burners (AREA)
  • Details Of Fluid Heaters (AREA)

Claims (15)

  1. Procédé de fabrication d'une chambre de combustion, notamment pour un chauffe-eau au gaz dont les parois sont formées par une tôle de paroi intérieure et une tôle de paroi extérieure (42, 44) soudées l'une à l'autre, ces tôles étant munies de déformations locales pour constituer des canaux (46) pour un fluide, notamment pour l'eau de chauffage servant de fluide de refroidissement, tandis qu'après soudage le long des futurs bords des canaux on réalise les canaux (46) par déformation des zones de tôle (42, 44) entre les cordons de soudure (48), avec un fluide introduit entre les tôles de paroi (38, 40) et mis en pression, les parois ayant des zones de cintrage (60) pour les tôles de paroi soudées, dans lesquelles les parois ont été cintrées pour former la chambre de combustion,
    caractérisé en ce qu'
    avant d'introduire le fluide de travail dans la zone de cintrage (60) on appuie la paroi intérieure (40) sur un outil intérieur (80), et la tôle de paroi extérieure (38) laisse une distance par rapport à un outil extérieur (82) pour former, après l'introduction du fluide de travail, les limites de déformation des canaux (46), la distance de l'outil extérieur (82) par rapport à la tôle de paroi extérieure (38) dans la zone de cintrage (60) étant dimensionnée plus grande que dans les zones d'appui allongées.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    l'outil intérieur (80) comporte au moins une cavité en avant de la zone de cintrage (60) pour former des poches de profondeur augmentée pour recevoir l'excédent de matière (62) de la tôle de paroi intérieure (40).
  3. Procédé selon la revendication 1,
    caractérisé en ce que
    les cordons de soudure (48) ainsi que les zones de tôle (42, 44) adjacentes aux cordons sont étirés lors de la fabrication des canaux (46), mettant sans appui les cordons de soudure entre l'outil intérieur (80) et l'outil extérieur (82).
  4. Procédé selon la revendication 3,
    caractérisé en ce que
    l'étirage se fait jusque dans la zone plastique avec un allongement permanent εr.
  5. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    les cordons de soudure (48) sont disposés pour que des chambres communes (46c, e) occupent les zones de coin des tôles de paroi (38, 40).
  6. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la tôle de paroi extérieure (38) est munie, avant le soudage à la tôle de paroi intérieure (40) d'une ouverture (52) pour l'alimentation du fluide de travail et ensuite pour brancher une conduite du fluide de fonctionnement, notamment de l'eau de chauffage.
  7. Procédé selon la revendication 6,
    caractérisé en ce que
    l'ouverture (52) est prévue dans une partie déformée (50) en forme de dôme de la tôle de paroi (38).
  8. Procédé selon l'une quelconque des revendications 6 ou 7,
    caractérisé en ce que
    les cordons de soudure (48) sont installés et réalisés pour avoir différente canaux (46a, d, f, h) parallèles et des chambres communes (46b, c, e, g, i, j) dans leur zone d'entrée et de sortie, et pour qu'en outre les ouvertures (52) pour les conduites de branchement sont prévues dans la zone des chambres extérieures (46b, g, i, j).
  9. Procédé selon la revendication 8,
    caractérisé en ce que
    les cordons de soudure (48) sont disposés pour que les chambres communes (46c, e) occupent les zones de coin des tôles de paroi (38, 40).
  10. Procédé selon l'une quelconque des revendications 8 ou 9,
    caractérisé en ce que
    le début des différents canaux (46d, h) est décalé l'un par rapport à l'autre.
  11. Procédé selon l'une quelconque des revendications 7 à 10,
    caractérisé en ce que
    les extrémités (66) des cordons de soudure (48) se terminent suivant une tracé circulaire.
  12. Procédé selon la revendication 1,
    caractérisé en ce que
    les tôles de paroi (38, 40) soudées l'une à l'autre sont cintrées sous la forme d'un corps en U constituant la paroi arrière (12) et les parois latérales (14, 16) de la chambre de combustion (10), et la paroi avant (18) de la chambre de combustion (10) est une pièce séparée reliée de manière amovible aux parois latérales (14, 16).
  13. Chambre de combustion pour des chauffe-eau chauffés au gaz fabriquée selon l'une quelconque des revendications 1 à 12, dont les parois sont constituées de deux tôles de paroi (42, 44) soudées l'une à l'autre entre lesquelles, par des déformations locales, on réalise des canaux (46) pour un passage d'eau de refroidissement de la chambre de combustion (10),
    caractérisée en ce que
    la section de passage minimal amin correspond au débit nécessaire de fluide, notamment d'eau de chauffage, pour le refroidissement de la chambre de combustion (10), et
    pour une surface de refroidissement prédéterminée de la chambre de combustion (10), à la fois dans la zone d'allongement des canaux et dans la zone de coin de la zone de cintrage (60) la largeur des canaux est supérieure ou égale à la section de passage minimal amin.
  14. Chambre de combustion selon la revendication 13,
    caractérisée en ce que
    la profondeur (b) de la cavité de la zone de canal étirée est égale à la largeur (c) de la distance d'écartement.
  15. Chambre de combustion selon l'une quelconque des revendications 13 ou 14,
    caractérisée en ce que
    la largeur (a) de la section de passage dans les zones de cintrage (60) est égale à la somme de la profondeur (b) de la cavité et de la largeur (c) de la distance d'écartement dans la zone d'allongement des canaux.
EP19970109618 1996-07-01 1997-06-13 Procédé de fabrication d'une chambre de combustion, spécialement pour chauffe-eau à gaz, et chambre de combustion fabriquée selon ce procédé Expired - Lifetime EP0816777B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19626322 1996-07-01
DE19626322 1996-07-01
DE19722289A DE19722289A1 (de) 1996-07-01 1997-05-28 Verfahren zur Herstellung einer Brennkammer, insbesondere für gasbeheizte Wassererhitzer und nach dem Verfahren hergestellte Brennkammer
DE19722289 1997-05-28

Publications (3)

Publication Number Publication Date
EP0816777A2 EP0816777A2 (fr) 1998-01-07
EP0816777A3 EP0816777A3 (fr) 1999-01-07
EP0816777B1 true EP0816777B1 (fr) 2002-12-18

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Application Number Title Priority Date Filing Date
EP19970109618 Expired - Lifetime EP0816777B1 (fr) 1996-07-01 1997-06-13 Procédé de fabrication d'une chambre de combustion, spécialement pour chauffe-eau à gaz, et chambre de combustion fabriquée selon ce procédé

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EP (1) EP0816777B1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPQ792400A0 (en) * 2000-06-02 2000-06-29 Southcorp Australia Pty Ltd Improved heat exchange element

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9200780U1 (de) * 1991-01-25 1992-03-19 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Brennkammer mit Doppelmantel
DE4216474A1 (de) * 1991-05-21 1992-11-26 Vaillant Joh Gmbh & Co Verfahren zur herstellung eines doppelwandigen heizschachtes
DE4224212A1 (de) * 1991-07-22 1993-01-28 Vaillant Joh Gmbh & Co Doppelwandiger heizschacht

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EP0816777A2 (fr) 1998-01-07

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