EP0816776B1 - Chauffe-eau à gaz et chambre de combustion refroidie par eau - Google Patents

Chauffe-eau à gaz et chambre de combustion refroidie par eau Download PDF

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Publication number
EP0816776B1
EP0816776B1 EP19970109434 EP97109434A EP0816776B1 EP 0816776 B1 EP0816776 B1 EP 0816776B1 EP 19970109434 EP19970109434 EP 19970109434 EP 97109434 A EP97109434 A EP 97109434A EP 0816776 B1 EP0816776 B1 EP 0816776B1
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EP
European Patent Office
Prior art keywords
water
combustion chamber
wall
heater according
water heater
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
EP19970109434
Other languages
German (de)
English (en)
Other versions
EP0816776A2 (fr
EP0816776A3 (fr
Inventor
Heinz Ehrle
Ernst Schmidt
Hans-Ulrich Lenckner
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 DE19722865A external-priority patent/DE19722865A1/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0816776A2 publication Critical patent/EP0816776A2/fr
Publication of EP0816776A3 publication Critical patent/EP0816776A3/fr
Application granted granted Critical
Publication of EP0816776B1 publication Critical patent/EP0816776B1/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
    • F24H1/22—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
    • 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
    • F24H9/00—Details
    • F24H9/14—Arrangements for connecting different sections, e.g. in water heaters 
    • 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
    • F24H9/00—Details
    • F24H9/14—Arrangements for connecting different sections, e.g. in water heaters 
    • F24H9/146—Connecting elements of a heat exchanger

Definitions

  • the invention is based on a gas-fired water heater and from a water-cooled combustion chamber, as is known from AT-PA 957/92.
  • this known version is the heat exchanger with the Combustion chamber in a complex manufacturing process uniformly connected.
  • the combustion chamber is made of two U-shaped, double-walled parts assembled on the End faces of her thighs to a circumferentially closed Are welded together.
  • the inner side walls of the Schachtes are with breakthroughs surrounded by the collar provided, in which the from the slat block of the Heat exchanger laterally protruding water pipes intervention.
  • This version requires one relatively high production costs and complicates the Maintenance of heat exchangers and burners. Besides, it can because of the uniform connection of thermal differently stressed parts different substances to undesirably high Thermal stresses come.
  • a gas-heated water heater is included a trained as a lamella block with water pipes Heat exchanger and a shaft for combustion gases enclosing combustion chamber known.
  • the combustion chamber has a water-cooled, removable front wall on. The remaining three side walls are without water cooling executed and are inside with heat protection elements lined.
  • the water channels for cooling the Front wall are with the water pipes of the heat exchanger connected, the water-carrying when dismantling the front wall Channels separated from the pipe connections of the heat exchanger Need to become. To do this, it is necessary that Drain water from the heating circuit.
  • a double-walled heating shaft is from DE-A1-42 24 212 known, the heating shaft contains channels through which Water flows to cool it.
  • the heating shaft is included made from two U-shaped parts attached to the End faces are interconnected. A detachable connection of parts and separation of the water cycles not provided.
  • the arrangement according to the invention has the advantage that the Combustion chamber especially with regard to the on or in channels provided on their walls made easier can be considered a circumferentially closed shaft and that also the installation of the heat exchanger on the combustion chamber, as well as the maintenance of heat exchangers and burners are relieved.
  • thermal expansion can occur the separate design of the combustion chamber and heat exchanger are better controlled than with a uniform, firm Connecting these parts.
  • the removable or swiveling version of the water-cooled front wall of the combustion chamber it is in advantageously possible for maintenance or Repairs to the the easy way Components such as heat exchangers that delimit the combustion chamber shaft or burner to get to the water-cooled Interrupt the heating circuit connected to the combustion chamber have to.
  • the to or from the water-cooled front wall outgoing line section of the heating circuit is in advantageously as a flexible rubber hose with a Wire mesh jacket formed.
  • the channels for the heating water arranged in the front wall are advantageously arranged so that it is in it flowing water targeted from the lower right corner area arranged entrance to the lower left corner area arranged output can flow.
  • Heating water increases, which advantageously in the Air located in the front wall is entrained. So that can Heating system in a simple way on another Position, e.g. in the area of the circulation pump.
  • a simple version of a not water-cooled Front wall results if this consists of one temperature-resistant inner wall panel and one in There is a parallel distance to the outer wall panel and a flow of cooling air between the two wall plates is passed through. In this case, this can be useful outer wall panel a shiny metallic Wear radiation protection layer.
  • 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 an enlarged partial section along the line V in Figure 1 in the connection area for the heating circuit
  • Figure 8 and FIG. 9 are enlarged partial representations of views A and B in FIG Connection area for the heating circuit
  • Figure 10 a Top view of a corner area of the combustion chamber
  • FIG. 11 a second embodiment of a removable water-cooled front wall
  • Figure 12 is a partial section by another alternative version of the front wall.
  • the water heater has a combustion chamber 10 with a Rear wall 12 and two integrally connected to these Side walls 14, 16 on which a front wall 18 is detachable is attached.
  • the combustion chamber 10 is from above Heat exchanger 20 can be put on, as a lamella block performed water pipes is formed.
  • the sidewalls 14, 16 of the combustion chamber 10 are towards the upper end edge open recesses 22 provided to fit the Recording of protruding beyond the outer slats 24 Tube ends 26 ( Figure 2) of the heat exchanger 20 are used.
  • the crenellated formed between the recesses 22 Sections 28 of the side walls 14, 16 are beaded Provide recesses 30 which on the outer fins 24th fit without gaps and the heat exchanger 20 without play establish.
  • the tube ends 26 are by caps 32a, b, c connected to one another, at which 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 Channel system 46 described for the combustion chamber 10 cooling heating water flow is formed.
  • the channel system 46 is produced in that the wall plates 38, 40th initially in its essentially flat starting form connected by straight weld seams 48 and only then the channel system 46 by molding that between the welds 48 Sheet metal areas 42, 44 by means of a pressure between the wall plates 38, 40 introduced fluid working fluid is formed.
  • a fluid working fluid Water or air can be used.
  • the channel system 46 in the rear wall 12 and the side walls 14, 16 is according to the settlement of these wall parts according to the figure 3 by a self-contained circumferential weld seam 48a and ten elongated single weld seams 48b-k were formed.
  • a self-contained circumferential weld seam 48a and ten elongated single weld seams 48b-k were formed.
  • there are four in the side wall 14 Individual channels 46a, the edge of a chamber 46b are interconnected and opens into a chamber 46c.
  • Five parallel individual channels 46d lead from the latter Rear wall 12 continues into a chamber 46e, which has four Individual channels 46f in the side wall 16 with an outer Chamber 46g is connected.
  • the fluid working fluid for expanding the between the Weld seams 48 lying sheet metal areas 42, 44 is pressed between the wall sheets 38, 40 if this lie supported between the bending tools.
  • the Bending tools are to be manufactured according to the Channel system 46 on their support surfaces with recesses into which the sheet metal areas 42, 44 to be formed be pushed in.
  • the recesses inside Bending tools are at full depth only to the edge of the Bending zones 60 brought up and formed there so that the inner wall panel 40 approximately along the neutral fiber bends.
  • the outer bending tool is in the bending zones 60 recesses provided so that there outer wall plate 38 to a greater extent than in the stretched Channel areas can bulge outwards.
  • the arrangement is preferably such that the width a of the flow cross section in the bending zones 60 larger or equal to the depth b of a formation in one of the wall sheets is in the stretched channel area.
  • the inside is Bending tool next to the bending zones 60 locally with recessed Provide recesses so that there is excess Material 62 of the inner wall plate 40 can be molded into it.
  • the inner bending tool has one support surface each trough-shaped depression to form a dome-shaped Bulge of the inner wall panel 40 provided, whereby the flow resistance at the entrance and exit of the Channel system 46 further reduced.
  • FIG. 8 A slightly modified embodiment for the Connection points of the channel system 46 in the side walls 14, 16 is shown in FIG. It is on before Widening of the combustion chamber attached dome-like features dispensed with and the connecting piece 54, 55 to the smooth formed outer wall plate 38 at the level of the opening 52 welded or soldered on.
  • the inner bending tool is also with wall plates 38, 40 a trough-like depression to form a bulge with a depth c of beyond the channel width approx. 4 mm.
  • the extension of this bulge in the The connection area of the side walls 14, 16 is in FIGS. 8 and 9 shown in dashed lines. Through this spatially extensive bulges also decrease Flow resistance at the entrance and exit of the Channel system 46.
  • the weld seams 48 running between the individual channels have circular ends 66 so that there the sheet material without expanding the individual channels Risk of cracking can bulge like a pillow.
  • the Circle diameter of the ends 66 should not be less than 5 mm, but also not be larger than 15 mm, by which the loss of effective heat transfer surface in to keep an acceptable framework. In a preferred one The circular diameter was chosen to be 12 mm. Wrinkling is also prevented by the further measure counteracted that the ends 66 of the parallel Single channels 48b-d, 48g-h, 48i-k and 48m-p 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 abut one another directly in the bending zones 60.
  • 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 the corner radius r 2 in the corner regions of the combustion chamber 10 below, over which the chambers 46c, e of the duct system 46 also extend is dimensioned much larger and is, for example, 20 mm.
  • the transition from one corner radius to the other is made without a gap by first bending the entire plant with the larger corner radius r 2 and then shaping the smaller corner radius r 1 by stretching the wall plates 38, 40 from the inside to the outside.
  • the individual channels of the channel system 46 are through the Welds 48 immediately limited, so that at their Longitudinal edges 64 (FIG. 2) do not form any gaps in which could deposit corrosion products.
  • the weld seams 48 are in the practically still flat condition of the wall sheets 38, 40 manufactured, whereby the production is facilitated.
  • the front wall 18 is through the Training of its hydraulic connection connections from the remaining wall parts 12, 14, 16 of the combustion chamber 10 detachable, without the one used to cool the combustion chamber Heating water flow must be interrupted.
  • connection elements 56, 57 are by means of Flanges 74, 76 with the outer band plate 38 of the Welded front wall 18.
  • the hose lines 70, 72 are thereby for external protection and to increase the Provide pressure resistance with a stainless steel wire mesh.
  • connection elements 56, 57 for the heating water circuit with each connected to a swivel 78, 80, the one Swiveling or folding the front wall 18 towards the front enable.
  • the dash-dotted line forms Line the common pivot axis.
  • the moveable to each other trained parts of the rotary joints 78, 80 are each with an O-ring 82, 84 sealed and by locking washers 86, 88 held to each other.
  • the in the side wall 14 and in the front wall 18th attached welds 48d and 48p run to the Outputs (connecting piece 55 or connecting element 57) out vertically so that the heating water is targeted from the entrances (Connection piece 54 or connecting element 57) to the Outputs can flow.
  • the flow rate of the heating water becomes Output increased by the four lower channels 46h are flowed through in pairs in parallel, while then the heating water flow only through the Welds 48p and 481 formed channel to the exit to be led.
  • By increasing the Flow velocity is that in the channel system 46 air cooled in the water-cooled combustion chamber. So the water-cooled combustion chamber itself does not need be vented. As is well known, this can be done on a Circulation pump arranged in the heating circuit.
  • the heating efficiency can be improved if the Heat transfer from heating gas to the combustion chamber wall Increase in the number of beams y due to oxidation or Blackening of the inner surface is increased.
  • the front wall 68 shown in FIG. 12 consists of a outer wall plate 70 and one parallel to it arranged inner wall plate 72, which consists of a particularly temperature-resistant material.
  • inner wall plate 72 On the 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 is for the passage of an 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)
  • Details Of Fluid Heaters (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Claims (12)

  1. Chauffe-eau à gaz comportant un échangeur de chaleur (20) réalisé comme bloc de lamelles traversé par des tubes d'eau, et une chambre de combustion (10) refroidie par l'eau, entourant une cage pour les gaz de combustion, des canaux d'eau étant prévus pour le refroidissement de la chambre de combustion sur ou au moins dans une paroi latérale de la chambre de combustion, dans lequel
    la paroi avant (18) de la chambre de combustion (10) refroidie à l'eau et l'échangeur de chaleur (20) sont des ensembles distincts, et
    la paroi avant (18) également refroidie à l'eau est reliée au circuit d'eau par des moyens (70, 72 ou 78, 80) qui permettent l'enlèvement ou le basculement de la paroi avant (18) par rapport aux autres parties de paroi de la chambre de combustion (10) sans avoir à couper le circuit d'eau.
  2. Chauffe-eau à gaz selon la revendication 1,
    caractérisé en ce que
    les parois latérales (14, 16) de la chambre de combustion (10) ont des cavités (22) ouvertes vers la paroi frontale pour recevoir les extrémités des tubes d'eau (26) dépassant des lamelles extérieures (24) de l'échangeur de chaleur (20) ou de leurs éléments de liaison et de renvoi (32).
  3. Chauffe-eau à gaz selon la revendication 2,
    caractérisé en ce que
    les segments (28) des parois latérales (14, 16), crénelées, formées entre les cavités (22) sont munis de cavités (30) en forme de rainures pour s'appuyer sans former de plis contre les lamelles extérieures (24) de l'échangeur de chaleur (20).
  4. Chauffe-eau à gaz selon l'une des revendications 1 à 3, dans lequel la chambre de combustion refroidie (10) a une section sensiblement rectangulaire dont les parois sont formées de deux tôles de paroi, juxtaposées, reliées l'une à l'autre, et ayant des déformations locales pour constituer le système de canaux de passage d'eau de chauffage, qui s'étend dans la zone d'entrée de la chambre de combustion 10 sur les zones de coin et
    la chambre de combustion (10) présente dans la zone d'entrée un rayon de courbure r2 du coin plus grand et dans la zone recevant l'échangeur de chaleur (20), un rayon de courbure de coin r1 plus petit, de l'intérieur vers l'extérieur, de préférence adapté au profil du bloc à lamelles et obtenu par allongement des tôles de cloison (38, 40).
  5. Chauffe-eau à gaz selon la revendication 4,
    caractérisé en ce que
    le système de canaux (46) remonte au niveau de la paroi arrière (12) et/ou de la paroi avant (18) de la chambre de combustion (10) jusqu'à l'arête supérieure de l'échangeur de chaleur (20).
  6. Chauffe-eau à gaz selon la revendication 4 ou 5, dont les parois de la chambre (10) sont formés de deux tôles de paroi appliquées l'une contre l'autre, soudées l'une à l'autre, ces parois étant en acier inoxydable et comportant des déformations locales pour constituer des canaux pour le fluide, notamment de l'eau de chauffage, et dont
    les tôles de paroi (38, 40) sont reliées par des cordons de soudure (48) dirigés le long des bords des canaux et après soudage, les canaux (46) sont formés par déformation des zones de tôles (42, 44) qui se trouvent entre les cordons de soudure (48), à l'aide d'un fluide introduit sous pression entre les tôles de parois (38, 40).
  7. Chauffe-eau à gaz selon la revendication 1,
    caractérisé en ce que
    les moyens sont constitués par des conduites d'eau souples (70, 72).
  8. Chauffe-eau à gaz selon la revendication 7,
    caractérisé en ce que
    la conduite souple (70, 72) est un tuyau en caoutchouc avec une gaine de fils de fer.
  9. Chauffe-eau à gaz selon la revendication 1,
    caractérisé en ce que
    les moyens sont réalisés sous la forme d'articulation de rotation (78, 80).
  10. Chauffe-eau à gaz selon la revendication 1,
    caractérisé par
    deux éléments de raccordement (56, 57) reliés aux moyens (70, 72 ou 78, 80) à une certaine hauteur de la zone de coin droite et gauche, inférieure de la paroi avant (18) refroidie par l'eau, permettant de basculer ou de rabattre la paroi avant (18) vers l'avant.
  11. Chauffe-eau à gaz selon la revendication 10,
    caractérisé en ce que
    les canaux (46h) prévus dans la paroi avant (81) sont réalisés pour que l'eau chaude qui les traverse, soit guidée d'un branchement (56) à l'autre (57).
  12. Chauffe-eau à gaz selon la revendication 11,
    caractérisé en ce que
    la section d'écoulement des canaux (46h) diminue vers le branchement (57).
EP19970109434 1996-07-01 1997-06-11 Chauffe-eau à gaz et chambre de combustion refroidie par eau Expired - Lifetime EP0816776B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19626325 1996-07-01
DE19626325 1996-07-01
DE19722865 1997-05-31
DE19722865A DE19722865A1 (de) 1996-07-01 1997-05-31 Gasbeheizter Wassererhitzer und wassergekühlte Brennkammer

Publications (3)

Publication Number Publication Date
EP0816776A2 EP0816776A2 (fr) 1998-01-07
EP0816776A3 EP0816776A3 (fr) 1998-12-30
EP0816776B1 true EP0816776B1 (fr) 2002-10-09

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Application Number Title Priority Date Filing Date
EP19970109434 Expired - Lifetime EP0816776B1 (fr) 1996-07-01 1997-06-11 Chauffe-eau à gaz et chambre de combustion refroidie par eau

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19754514A1 (de) * 1997-12-09 1999-06-10 Bosch Gmbh Robert Verfahren und Vorrichtung zum Abtransport von Gasblasen aus einer doppelwandigen wassergekühlten Brennkammer eines Wassererhitzers
CN108826689A (zh) * 2018-07-26 2018-11-16 广东万家乐燃气具有限公司 一种高效容积式热交换器及热水器

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2050273A1 (fr) * 1969-07-11 1971-04-02 Calotech Ets
DE2742854C2 (de) * 1977-09-23 1985-05-02 Robert Bosch Gmbh, 7000 Stuttgart Wassererhitzer mit einem Gas- oder Ölbrenner
FR2595796B1 (fr) * 1986-03-14 1988-06-17 Chaffoteaux Et Maury Perfectionnements aux corps de chauffe pour chauffe-eau a gaz
ATE121831T1 (de) * 1991-05-21 1995-05-15 Vaillant Gmbh Doppelwandiger heizschacht eines warmwassergerätes.
DE4224212A1 (de) * 1991-07-22 1993-01-28 Vaillant Joh Gmbh & Co Doppelwandiger heizschacht
AT403199B (de) * 1994-08-03 1997-11-25 Vaillant Gmbh Heizgerät

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EP0816776A2 (fr) 1998-01-07
EP0816776A3 (fr) 1998-12-30

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