EP0816776B1 - Gas fired water heater and water cooled combustion chamber - Google Patents

Gas fired water heater and water cooled combustion chamber 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
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German (de)
French (fr)
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EP0816776A2 (en
EP0816776A3 (en
Inventor
Heinz Ehrle
Ernst Schmidt
Hans-Ulrich Lenckner
Hans-Joachim Braun
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
Priority claimed from DE19722865A external-priority patent/DE19722865A1/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
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Publication of EP0816776A3 publication Critical patent/EP0816776A3/en
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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)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem gasbeheizten Wassererhitzer und von einer wassergekühlten Brennkammer, wie er aus der AT-PA 957/92 bekannt ist. Bei dieser bekannten Ausführung ist der Wärmeübertrager mit der Brennkammer in einem aufwendigen Herstellungsprozeß einheitlich verbunden. Die Brennkammer ist aus zwei U-förmigen, doppelwandigen Teilen zusammengesetzt, die an den Stirnseiten ihrer Schenkel zu einem umfangsgeschlossenen Schacht zusammengeschweißt sind. Die inneren Seitenwände des Schachtes sind mit von kragenumgebenen Durchbrüchen versehen, in welche die aus dem Lamellenblock des Wärmeübertragers seitlich herausragenden Wasserrohre passend eingreifen. Je zwei nebeneinanderliegende Wasserrohre sind über eine Tasche in der Seitenwand der Brennkammer miteinander verbunden. Diese Ausführung bedingt einen verhältnismäßig hohen Fertigungsaufwand und erschwert die Wartung von Wärmeübertrager und Brenner. Außerdem kann es wegen der einheitlichen Verbindung von thermisch unterschiedlich hochbeanspruchten Teilen aus unterschiedlichen Stoffen zu unerwünscht hohen Wärmespannungen kommen. 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. In 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. There are two adjacent water pipes via a pocket in the side wall of the combustion chamber connected with each other. 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.

Aus der EP-A-237 443 ist ein gasbeheizter Wassererhitzer mit einem als Lamellenblock mit durchgeführten Wasserrohren ausgebildeten Wärmeübertrager und einer einen Schacht für Verbrennungsgase umschliessenden Brennkammer bekannt. Die Brennkammer weist eine wassergekühlte, abnehmbare Vorderwand auf. Die restlichen drei Seitenwände sind dabei ohne Wasserkühlung ausgeführt und sind innen mit Hitzeschutzelementen ausgekleidet. Die wasserführenden Kanäle zur Kühlung der Vorderwand sind mit den Wasserrohren des Wärmeübertragers verbunden, wobei beim Abbau der Vorderwand die wasserführenden Kanäle von den Rohranschlüssen des Wärmeübertragers getrennt werden müssen. Dazu ist es vorher erforderlich, das Wasser aus dem Heizkreislauf abzulassen.From EP-A-237 443 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 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.

Ein doppelwandiger Heizschacht ist aus der DE-A1-42 24 212 bekannt, wobei der Heizschacht Kanäle enthält, durch die Wasser zur Kühlung desselben strömt. Der Heizschacht ist dabei aus zwei u-förmigen Teilen hergestellt, die an den Stirnseiten miteinander verbunden sind. Eine lösbare Verbindung der Teile und eine Trennung der Wasserkreisläufe ist nicht versehen.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.

Weitere wassergekühlte Brennkammern sind aus der DE-A1-195 27 479 und der WO 92/20976 A1 bekannt. Hierbei sind alle vier Seitenwände mit einem geschlossenes Kühlsystem vorgesehen. Further water-cooled combustion chambers are from the DE-A1-195 27 479 and WO 92/20976 A1 are known. in this connection are all four side walls with a closed cooling system intended.

Schließlich sind aus der NL-A-78 09 670 und der FR-A-2 050 273 Wassererhitzer mit nichtwassergekühlten Brennkammern bekannt, die jeweils über einen Wärmeübertrager verfügen, die einen Lamellenblock aufweisen. Finally, from NL-A-78 09 670 and the FR-A-2 050 273 water heater with non-water cooled Combustion chambers known, each via a heat exchanger have a slat block.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Anordnung mit den Merkmalen des Anspruch hat den Vorteil, daß die Brennkammer insbesondere mit Rücksicht auf die an bzw. in ihren Wänden vorgesehenen Kanäle einfacher hergestellt werden kann als ein umfangsgeschlossener Schacht und daß auch die Montage des Wärmeübertragers an der Brennkammer, sowie die Wartung von Wärmeübertrager und Brenner wesentlich erleichtert sind. Darüberhinaus können Wärmedehnungen durch die getrennte Ausführung von Brennkammer und Wärmeübertrager besser beherrscht werden als bei einer einheitlichen, festen Verbindung dieser Teile.The arrangement according to the invention Features of the claim 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. In addition, 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.

Durch die abnehmbare bzw. abschwenkbare Ausführung der wassergekühlten Vorderwand der Brennkammer ist es in vorteilhafter Weise möglich, für Wartungs- bzw. Reparaturarbeiten auf einfache Art und Weise an die den Brennkammerschacht begrenzenden Bauteile wie Wärmeübertrager oder Brenner zu gelangen, ohne den an die wassergekühlte Brennkammer angeschlossenen Heizkreislauf unterbrechen zu müssen.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.

Durch die Merkmale der abhängige Ansprüche sind vorteilhafte Ausgestaltungen und Weiterbildungen der Anordnungen nach dem Anspruch 1 möglich.Due to the features of the dependent claims are advantageous Refinements and developments of the arrangements according to claim 1 possible.

Eine einfache und lagerichtige Montage des Wärmeübertragers mit der Brennkammer ergibt sich, wenn deren Seitenwände zum Stirnrand hin offene Ausnehmungen zur Aufnahme der über die äußeren Lamellen des Wärmeübertragers hervorstehenden Wasserrohrenden bzw. von deren Verbindungs- und Umlenkelementen haben. A simple and correct installation of the heat exchanger with the combustion chamber results when the side walls to Recesses open to the front edge for receiving the over the protruding outer fins of the heat exchanger Water pipe ends or their connection and Have deflection elements.

Zum paßgenauen, spielfreien Festhalten des Wärmeübertragers an der Brennkammer wird weiter vorgeschlagen, daß die zwischen den Ausnehmungen gebildeten zinnenartigen Abschnitte der Seitenwände mit sickenförmigen Vertiefungen zur spaltfreien Anlage an den äußeren Lamellen des Wärmeübertragers versehen sind.For precise, play-free holding of the heat exchanger at the combustion chamber it is further proposed that the crenellated between the recesses Sections of the side walls with beaded depressions for gap-free contact with the outer slats of the Heat exchanger are provided.

Bei Wärmeübertragern mit einer gekühlten Brennkammer mit etwa rechteckigem Querschnitt, deren Wände aus zwei aneinander anliegenden, miteinander verbundenen Wandblechen bestehen, die mit örtlichen Ausformungen zur Bildung eines heizungswasserführenden Kanalsystem versehen sind, wird den Erfordernissen der Fertigungserleichterung einerseits und einer möglichst weitgehenden Anpassung der Brennkammer an das Querschnittsprofil des Wärmeübertragers andererseits vorteilhaft dadurch Rechnung getragen, daß die Brennkammer im Eingangsbereich einen größeren Eckenradius und in dem den Wärmeübertrager aufnehmenden Bereich einen vorzugsweise dem Profil des Lamellenblocks angepaßten, durch Vollstreckung der Wandbleche von innen nach außen gebildeten kleineren Eckenradius hat.For heat exchangers with a cooled combustion chamber roughly rectangular cross-section, the walls of which are two adjacent, interconnected wall panels exist with local formations to form a heating water duct system is provided Requirements to facilitate production on the one hand and the greatest possible adaptation of the combustion chamber the cross-sectional profile of the heat exchanger on the other hand advantageously taken into account in that the combustion chamber in the entrance area a larger corner radius and in the Heat transfer area preferably a Profile of the slat block adapted by enforcement of the wall panels formed smaller from the inside out Has corner radius.

Mit der erfindungsgemäßen Ausbildung der Seitenwände der Brennkammer stehen diese für die Anordnung von wasserführenden Kanälen nicht mehr voll zur Verfügung. Um trotzdem die vorhandenen Wandflächen der Brennkammer zur Kühlung und Wärmespannungsbegrenzung optimal zu nutzen, wird vorgeschlagen, daß das Kanalsystem an der Rückwand und/oder Vorderwand bis zur Oberkante des Wärmeübertragers hochgeführt ist.With the inventive design of the side walls of the Combustion chamber these stand for the arrangement of water-carrying channels are no longer fully available. Around nevertheless the existing wall surfaces of the combustion chamber Optimal use of cooling and thermal voltage limitation suggested that the channel system on the rear wall and / or Front wall up to the top edge of the heat exchanger is performed.

Bei Wassererhitzern mit einer Brennkammer, deren Wände aus zwei aneinander anliegenden, miteinander verschweißten Wandblechen aus Edelstahl bestehen, die mit örtlichen Ausformungen zur Bildung von Kanälen für ein Fluid, insbesondere Heizungswasser versehen sind, wird zur Fertigungserleichterung der Brennkammer und Vermeidung von Korrosion zwischen den Wandblechen in den den Kanälen benachbarten Zonen vorgeschlagen, daß die Wandbleche durch entlang der Kanälränder verlaufende Schweißnähte miteinander verbunden sind und die Kanäle nach dem Verschweißen durch Ausformen der zwischen den Schweißnähten sich befindenden Blechbereiche mittels eines mit Preßdruck zwischen die Wandbleche eingeführten fluiden Arbeitsmittels gebildet sind.In water heaters with a combustion chamber, the walls of which two adjacent, welded together Stainless steel wall panels are made using local Formations for the formation of channels for a fluid, heating water in particular is used Making the combustion chamber easier and avoiding Corrosion between the wall panels in the channels neighboring zones suggested that the wall panels through weld seams running along the channel edges are connected and through the channels after welding Forming those located between the weld seams Sheet metal areas by means of a pressure between the Formed wall plates introduced fluid working fluid are.

Die erfindungsgemäß getrennt vom übrigen Schachtkörper ausgeführte Vorderwand der Brennkammer ist ebenfalls mit Kanälen und Taschen für einen kühlenden Wasserstrom versehen.According to the invention separated from the rest of the shaft body executed front wall of the combustion chamber is also with Channels and pockets for a cooling water flow Mistake.

Dabei ist in vorteilhafter Weise die mit Kühlkanälen versehene und in einem Heizkreislauf eingebundene Vorderwand der Brennkammer von dem restlichen Brennkammerschacht abnehmbar bzw. abschwenkbar ausgebildet, so daß Reparatur- bzw. Wartungsarbeiten möglich sind, ohne den Heizkreislauf unterbrechen zu müssen.This is advantageously the one with cooling channels provided and integrated in a heating circuit front wall the combustion chamber from the remaining combustion chamber shaft designed to be removable or pivotable so that repair or maintenance work is possible without the heating circuit to have to interrupt.

Der zu der bzw. von der wassergekühlten Vorderwand wegführende Leitungsabschnitt des Heizkreislaufes ist in vorteilhafter Weise als flexibler Gummischlauch mit einer Drahtgewebe-Ummantelung ausgebildet.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.

Eine weitere vorteilhafte Alternative für die Realisierung einer abschwenkbaren wassergekühlten Vorderwand besteht darin, in dem zur Vorderwand führenden Leitungsabschnitt des Heizkreislaufes und in dem von der Vorderwand wegführenden Leitungsabschnitt jeweils ein Drehgelenk anzuordnen. Another advantageous alternative for the implementation there is a swiveling water-cooled front wall in it, in the line section leading to the front wall of the Heating circuit and in the leading away from the front wall Line section to arrange a swivel.

Um ein Abschwenken bzw. Abklappen der Vorderwand nach vorn zu ermöglichen, sind die an der Vorderwand angeordneten Anschlüsse für die Leitungsabschnitte des Heizkreislaufes auf einer Höhe im rechten und linken unteren Eckbereich der Vorderwand angeordnet. Die beiden Drehgelenke sind so angeordnet, daß sie eine gemeinsame Schwenkachse für die Vorderwand bilden.To swivel or fold the front wall forward to be made possible are those arranged on the front wall Connections for the line sections of the heating circuit at a height in the lower right and left corner area of the Front wall arranged. The two swivel joints are like this arranged that they have a common pivot axis for the Form the front wall.

Die in der Vorderwand angeordneten Kanäle für das Heizwasser sind in vorteilhafter Weise so angeordnet, daß das darin strömende Wasser gezielt vom im unteren rechten Eckbereich angeordneten Eingang zum im unteren linken Eckbereich angeordneten Ausgang strömen kann.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.

Durch die Querschnittsverkleinerung der Kanäle zum Ausgang der Vorderwand hin wird die Strömungsgeschwindigkeit des Heizwassers erhöht, wodurch in vorteilhafter Weise in der Vorderwand befindliche Luft mitgerissen wird. Damit kann das Heizungssystem auf einfache Art und Weise an einer anderen Stelle, z.B. im Bereich der Umwälzpumpe, entlüftet werden.By reducing the cross-section of the channels to the exit the flow rate towards the front wall 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.

Eine einfache Ausführung einer nicht wassergekühlten Vorderwand ergibt sich, wenn diese aus einem temperaturfesten inneren Wandblech und einem im Parallelabstand dazu angeordneten äußeren Wandblech besteht und zwischen beide Wandbleche ein Kühlluftstrom hindurchgeführt ist. In diesem Fall kann zweckmäßig das äußere Wandblech eine metallisch glänzende Strahlungsschutzschicht tragen.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.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 in perspektivischer Darstellung eine Brennkammer für gasbeheizte Wassererhitzer mit einem nach oben abgehobenen, als Lamellenblock mit hindurchgeführten Wasserrohren ausgebildeten Wärmeübertrager und einer lösbar mit den Seitenwänden der Brennkammer verbindbaren Vorderwand, Figur 2 in vergrößertem Maßstab einen senkrechten Schnitt durch die Seitenwand der Brennkammer und einen Teilschnitt durch den aufgesetzten Wärmeübertrager nach Figur 1, Figur 3 eine Draufsicht auf eine aus zwei miteinander verschweißten Wandblechen bestehende Platine, die nach dem Schweißen zu einem die Rückwand und die beiden Seitenwände der Brennkammer bildenden U-förmigen Teil gebogen wird, Figur 4 einen vergrößerten Schnitt nach der Linie IV in Figur 3, Figur 5 einen Querschnitt durch einen Eckbereich der Brennkammmer, in deren vor dem Wärmeübertrager liegenden Eingangsbereich, Figur 6 einen der Figur 5 entsprechenden Querschnitt durch einen alternativ ausgeführten Eckbereich der Brennkammer, Figur 7 einen vergrößerten Teilschnitt nach der Linie V in Figur 1 im Anschlußbereich für den Heizkreislauf, Figur 8 und 9 vergrößerte Teildarstellungen von Ansichten A und B im Anschlußbereich für den Heizkreislauf, Figur 10 eine Draufsicht auf einen Eckbereich der Brennkammer, Figur 11 ein zweites Ausführungsbeispiel einer abnehmbaren wassergekühlten Vorderwand und Figur 12 einen Teilschnitt durch eine weitere alternative Ausführung der Vorderwand.An embodiment of the invention is in the drawing shown and in the following description explained. 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. 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 and Figure 12 is a partial section by another alternative version of the front wall.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Der Wassererhitzer hat eine Brennkammer 10 mit einer Rückwand 12 und zwei einstückig mit diesen verbundenen Seitenwänden 14, 16, an denen eine Vorderwand 18 lösbar befestigt ist. Auf die Brennkammer 10 ist von oben her ein Wärmeübertrager 20 aufsetzbar, der als Lamellenblock mit durchgeführten Wasserrohren ausgebildet ist. Die Seitenwände 14, 16 der Brennkammer 10 sind mit zum oberen Stirnrand hin offenen Ausnehmungen 22 versehen, die zur paßgerechten Aufnahme von über die äußeren Lamellen 24 hervorstehenden Rohrenden 26 (Figur 2) des Wärmeübertrager 20 dienen. Die zwischen den Ausnehmungen 22 gebildeten zinnenartigen Abschnitte 28 der Seitenwände 14, 16 sind mit sickenförmigen Vertiefungen 30 versehen, die an den äußeren Lamellen 24 spaltfrei anliegen und den Wärmeübertrager 20 spielfrei festlegen. Die Rohrenden 26 sind durch Kappen 32a, b, c miteinander verbunden, an denen auch die Anschlüsse 34, 36 des Wärmeübertrager 20 vorgesehen sind.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.

Die Brennkammerwände bestehen je aus zwei aneinander anliegenden und miteinander verschweißten Wandblechen 38, 40 aus Edelstahl, die ausgeformte Blechbereiche 42, 44 aufweisen, zwischen denen ein nachstehend noch näher beschriebenes Kanalsystem 46 für einen die Brennkammer 10 kühlenden Heizungswasserstrom gebildet ist. Das Kanalsystem 46 wird dadurch hergestellt, daß die Wandbleche 38, 40 zunächst noch in ihrer im wesentlichen ebenen Ausgangsform durch geradlinige Schweißnähte 48 miteinander verbunden werden und erst danach das Kanalsystem 46 durch Ausformen der zwischen den Schweißnähten 48 sich befindenden Blechbereiche 42, 44 mittels eines mit Preßdruck zwischen die Wandbleche 38, 40 eingeführten fluiden Arbeitsmittels gebildet wird. Als fluides Arbeitsmittel kann beispielsweise Wasser oder Luft eingesetzt werden.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. For example, as a fluid working fluid Water or air can be used.

Das Kanalsystem 46 in der Rückwand 12 und den Seitenwänden 14, 16 ist gemäß der Abwicklung dieser Wandteile nach Figur 3 durch eine in sich geschlossene umlaufende Schweißnaht 48a und zehn gestreckte Einzelschweißnähte 48b-k gebildet. Demzufolge ergeben sich in der Seitenwand 14 vier Einzelkanäle 46a, die randseitig über eine Kammer 46b miteinander verbunden sind und in eine Kammer 46c mündet. Von dieser führen fünf parallele Einzelkanäle 46d in der Rückwand 12 weiter in eine Kammer 46e, die über vier Einzelkanäle 46f in der Seitenwand 16 mit einer äußeren Kammer 46g verbunden ist. Analog zu dieser Ausbildung sind auch die beiden Wandbleche der Vorderwand 18 durch eine umlaufende Schweißnaht 481 und durch Einzelschweißnähte 481-p miteinander verbunden, zwischen denen Kanäle 46h gebildet sind, die in Kammern 46i, j, k münden.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. As a result, 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. Are analogous to this training also the two wall panels of the front wall 18 by one circumferential weld seam 481 and by individual weld seams 481-p interconnected, between which channels 46h are formed are, which open into chambers 46i, j, k.

Vor dem Verschweißen werden in das außenliegende Wandblech an den Anschlußstellen des Kanalsystems 46 gemäß Figur 4 domartige Ausprägungen 50 mit Öffnungen 52 zum Einsetzen von Anschlußstutzen 54, 55 eingeformt. In die Vorderwand 18 werden ebenfalls Öffnungen eingebracht, die mit später näher zu beschreibenden Anschlußelementen 56, 57 versehen werden. Nach dem Verschweißen wird die in Figur 3 dargestellte Platine zwischen einem äußeren Biegewerkzeug und einem inneren Biegewerkzeug in die U-Form nach Figur 1 gebogen. Durch die in Figur 3 gestrichelt gezeichneten Linien 58 sind die Lage und die Grenzen der Biegezonen 60 dargestellt.Before welding, into the outside wall plate at the connection points of the channel system 46 according to FIG. 4 dome-like features 50 with openings 52 for inserting Connection piece 54, 55 molded. In the front wall 18 openings are also made, which will be closer to later to be described connecting elements 56, 57 are provided. After welding, the one shown in FIG. 3 is shown Circuit board between an outer bending tool and a inner bending tool bent into the U-shape according to Figure 1. By the lines 58 drawn with dashed lines in FIG. 3 the position and the limits of the bending zones 60 are shown.

Das fluide Arbeitsmittel zum Aufweiten der zwischen den Schweißnähten 48 liegenden Blechbereiche 42, 44 wird zwischen die Wandbleche 38, 40 gepreßt, wenn diese abgestützt zwischen den Biegewerkzeugen liegen. Die Biegewerkzeuge sind entsprechend des herzustellenden Kanalsystems 46 an ihren Stützflächen mit Ausnehmungen versehen, in welche die auszuformenden Blechbereiche 42, 44 hineingedrückt werden. Die Ausnehmungen im inneren Biegewerkzeug sind in voller Tiefe nur bis an den Rand der Biegezonen 60 herangeführt und dort so ausgebildet, daß sich das innere Wandblech 40 etwa entlang der neutralen Faser biegt. Das äußere Biegewerkzeug ist in den Biegezonen 60 mit vertieften Ausnehmungen versehen, so daß sich dort das äußere Wandblech 38 in stärkerem Maße als in den gestreckten Kanalbereichen nach außen wölben kann. 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.

Die Anordnung ist vorzugsweise so getroffen, daß die Breite a des Strömungsquerschnitts in den Biegezonen 60 größer oder gleich der Tiefe b einer Ausformung in einem der Wandbleche im gestreckten Kanalbereich ist. Dadurch und durch den Umstand, daß sich in den Biegezonen 60 die Kammern 46c, e befinden, wird die Wasserströmung in den Eckbereichen bzw. Biegezonen 60 nicht oder nur unwesentlich beeinträchtigt. Bei der alternativen Ausführung nach Figur 6 ist das innere Biegewerkzeug neben den Biegezonen 60 örtlich mit vertieften Ausnehmungen versehen, so daß sich dort überschüssiges Material 62 des inneren Wandblechs 40 hineinformen kann. In den den Anschlußstutzen 54, 55 gegenüberliegenden Stützflächen ist das innere Biegewerkzeug je mit einer muldenförmigen Vertiefung zur Bildung einer kuppenförmigen Auswölbung des inneren Wandblechs 40 versehen, wodurch sich der Strömungswiderstand am Eingang und am Ausgang des Kanalsystems 46 weiter verringert.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. Through this and through the Circumstances that the chambers 46c, e the water flow in the corner areas or Bending zones 60 not or only slightly affected. In the alternative embodiment according to FIG. 6, 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. In the connecting pieces 54, 55 opposite 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.

Eine leicht abgewandelte Ausführungsform für die Anschlußstellen des Kanalsystems 46 in den Seitenwänden 14, 16 ist in Figur 7 dargestellt. Dabei wird auf vor dem Aufweiten der Brennkammer angebrachte domartige Ausprägungen verzichtet und die Anschlußstutzen 54, 55 an das glatt ausgebildete äußere Wandblech 38 auf Höhe der Öffnung 52 angeschweißt oder angelötet. Beim Aufweiten der beiden Wandbleche 38, 40 ist das innere Biegewerkzeug ebenfalls mit einer muldenartigen Vertiefung zur Bildung einer Auswölbung mit einer über die Kanalbreite hinausgehenden Tiefe c von ca. 4 mm versehen. Die Ausdehnung dieser Auswölbung im Anschlußbereich der Seitenwände 14, 16 ist in den Figuren 8 und 9 gestrichelt dargestellt. Durch diese räumlich ausgedehnten Auswölbungen verringert sich ebenfalls der Strömungswiderstand am Eingang und am Ausgang des Kanalsystems 46. 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. When expanding the two 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.

Die zwischen den Einzelkanälen verlaufenden Schweißnähte 48 haben kreislinienförmig verlaufende Enden 66, damit sich dort beim Aufweiten der Einzelkanäle das Blechmaterial ohne Rißbildungsgefahr faltenlos kissenförmig aufwölben kann. Der Kreisdurchmesser der Enden 66 sollte nicht kleiner als 5 mm, aber auch nicht größer als 15 mm sein, um den dadurch bedingten Verlust an wirksamer Wärmeübergangsfläche in vertretbarem Rahmen zu halten. Bei einer bevorzugten Ausführung wurde der Kreisdurchmesser mit 12 mm gewählt. Einer Faltenbildung wird auch durch die weitere Maßnahme entgegengewirkt, daß die Enden 66 der parallel laufenden Einzelkanäle 48b-d, 48g-h, 48i-k und 48m-p versetzt zueinander angeordnet werden.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.

Aus Figur 3 ist ersichtlich, daß sich das Kanalsystem 46 in der Rückwand 12 nach oben bis in den den Wärmeübertrager 20 übergreifenden Bereich erstreckt und daß dort die Wandbleche 38, 40 in den Biegezonen 60 unmittelbar aneinander anliegen. Die Brennkammer 10 hat in diesem oberen, den Wärmeübertrager 20 eng umgreifenden Bereich einen Eckenradius r1 von beispielsweise 5 mm, wogegen in den darunterliegenden Eckbereichen der Brennkammer 10, über die sich auch die Kammern 46c, e des Kanalsystems 46 erstrecken, der Eckenradius r2 wesentlich größer bemessen ist und beispielsweise 20 mm beträgt. Der Übergang von einem zum anderen Eckenradius ist spaltfrei dadurch hergestellt, daß zunächst die gesamte Plantine mit dem größeren Eckenradius r2 gebogen und danach der kleinere Eckenradius r1 durch Verstrecken der Wandbleche 38, 40 von innen nach außen geformt wird.It can be seen from FIG. 3 that 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.

Die einzelnen Kanäle des Kanalsystems 46 werden durch die Schweißnähte 48 unmittelbar begrenzt, so daß sich an ihren Längsrändern 64 (Figur 2) keine Spalte bilden, in denen sich Korrosionsprodukte ablagern könnten. Die Schweißnähte 48 werden im praktisch noch ebenen Zustand der Wandbleche 38, 40 hergestellt, wodurch die Fertigung erleichtert wird. Durch die lösbaren Verbindungen von Wärmeübertrager 20 und Vorderwand 18 von den übrigen Wandteilen 12, 14, 16 der Brennkammer 10 wird die Wartung und Montage des Wärmeübertragers 20 sowie die Fertigung der Brennkammer 10 erleichtert. Dabei ist die Vorderwand 18 durch die Ausbildung seiner hydraulischen Anschlußverbindungen von den übrigen Wandteilen 12, 14, 16 der Brennkammer 10 lösbar, ohne daß der zur Kühlung der Brennkammer dienende Heizungswasserstrom unterbrochen werden muß. Dazu sind in einer ersten Ausführungsform z.B. aus einem Kupferrohr gebogene Anschlußelemente 56, 57 der Vorderwand 18 mit flexiblen Schlauchleitungen 70, 72 verbunden, die als Leitungsabschnitte einen Teil des Heizwasserkreislaufs bilden. Die Anschlußelemente 56, 57 sind mit Hilfe von Bundstegen 74, 76 mit dem äußeren Bandblech 38 der Vorderwand 18 verschweißt. Die Schlauchleitungen 70, 72 sind dabei zum äußeren Schutz und zur Erhöhung der Druckfestigkeit mit einem Edelstahldrahtgeflecht versehen.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. Through the detachable connections of heat exchanger 20 and Front wall 18 of the remaining wall parts 12, 14, 16 of the Combustion chamber 10 is the maintenance and assembly of the Heat exchanger 20 and the manufacture of the combustion chamber 10 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. These are in a first embodiment e.g. from a copper tube curved connecting elements 56, 57 of the front wall 18 flexible hose lines 70, 72 connected as Line sections a part of the heating water circuit form. The 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.

Bei einem zweiten Ausführungsbeispiel (Figur 11) sind die Anschlußelemente 56, 57 für den Heizwasserkreislauf mit jeweils einem Drehgelenk 78, 80 verbunden, die ein Abschwenken bzw. Abklappen der Vorderwand 18 nach vorn hin ermöglichen. Dabei bildet die strichpunktiert dargestellte Linie die gemeinsame Schwenkachse. Die beweglich zueinander ausgebildeten Teile der Drehgelenke 78, 80 sind mit jeweils einem O-Ring 82, 84 abgedichtet und durch Sicherungsscheiben 86, 88 zueinander gehalten.In a second embodiment (Figure 11) 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.

Wie in Figur 1 gestrichelt dargestellt, wird das aus dem Rücklauf RL eines nicht näher dargestellten Heizwasserkreislaufs strömende Heizwasser über den Anschluß 36 in den Wärmeübertrager 20 gepumpt; von einem nicht dargestellten Brenner erhitzt und zum als Ausgang ausgebildeten Anschluß 34 geführt. Von dort aus führt ein Leitungsabschnitt 90 über den Anschlußstutzen 54 zu dem in den Wandteilen 12, 14, 16 integrierten Kanalsystem 46, während ein Leitungsabschnitt 92 über das Anschlußelement 56 in das in der Vorderwand 18 integrierte Kanalsystem 46 führt. Über die als Ausgänge ausgebildeten Anschlußstutzen 55 und Anschlußelement 57 führen die Leitungen 90, 92 gemeinsam in den Vorlauf VL des Heizwasserkreislaufs.As shown in dashed lines in Figure 1, this is from the Return RL of a not shown Heating water circuit flowing heating water over the connection 36 pumped into the heat exchanger 20; from one not shown burner heated and as an output trained connection 34 performed. From there introduces Line section 90 via the connecting piece 54 to the in the wall parts 12, 14, 16 integrated channel system 46, while a line section 92 via the connection element 56 in the channel system 46 integrated in the front wall 18 leads. Via the connecting pieces designed as outputs 55 and connection element 57 lead the lines 90, 92 together in the flow line VL of the heating water circuit.

Die in der Seitenwand 14 und in der Vorderwand 18 angebrachten Schweißnähte 48d und 48p verlaufen zu den Ausgängen (Anschlußstutzen 55 bzw. Anschlußelement 57) hin senkrecht, so daß das Heizwasser gezielt von den Eingängen (Anschlußstutzen 54 bzw. Anschlußelement 57) zu den Ausgängen strömen kann. Insbesondere in der Vorderwand 18 wird die Strömungsgeschwindigkeit des Heizwassers zum Ausgang hin erhöht, indem die vier unteren Kanäle 46h jeweils paarweise parallel durchströmt werden, während danach der Heizwasserstrom allein durch den durch die Schweißnähte 48p und 481 gebildeten Kanal zum Ausgang geführt wird. Durch die Erhöhung der Strömungsgeschwindigkeit wird die im Kanalsystem 46 der wassergekühlten Brennkammer befindliche Luft mitgerissen. Damit braucht die wassergekühlte Brennkammer selbst nicht entlüftet werden. Dies kann, wie allgemein bekannt, an einer im Heizkreislauf angeordneten Umwälzpumpe erfolgen.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. Especially in the front wall 18 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.

Der Heizungswirkungsgrad kann verbessert werden, wenn der Wärmeübergang von Heizgas auf die Brennkammerwand durch Vergrößerung der Strahlzahl y infolge Oxidation oder Schwärzung der Innenoberfläche erhöht wird. 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.

Die in Figur 12 dargestellte Vorderwand 68 besteht aus einem äußeren Wandblech 70 und einem im Parallelabstand dazu angeordneten inneren Wandblech 72, welches aus einem besonders temperaturfesten Material besteht. Auf der Innenseite des Wandblechs 70 ist vorzugsweise eine metallisch-glänzende Strahlungsschutzschicht 74, gegebenenfalls in Form eines zusätzlichen Blechteils, vorgesehen. Der zwischen den beiden Wandblechen 70, 72 gebildete Raum 76 geht zum Hindurchführen eines Luftstromes, der dort aufgenommene Wärme zum Wärmübertrager 20 transportiert.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. 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.

Claims (12)

  1. Gas-fired water heater, with a heat exchanger (20) designed as a finned block with led-through water tubes, and with a water-cooled combustion chamber (10) which surrounds a shaft for the combustion gases and for the cooling of which water-carrying ducts are provided on or in at least one combustion-chamber side wall, the front wall (18) of the water-cooled combustion chamber (10) and the heat exchanger (20) being produced as separate subassemblies, and the front wall (18) likewise being water-cooled and being connected to the heating circuit via means (70, 72 and 78, 80) which make it possible to take off or pivot away the front wall (18) from the remaining wall parts of the combustion chamber (10), without the heating circuit having to be interrupted.
  2. Water-heater according to Claim 1, characterized in that the side walls (14, 16) of the combustion chamber (10) have recesses (22), open towards the end edge, for receiving the water-tube ends (26) projecting beyond the outer fins (24) of the heat exchanger (20) or receiving the connection and deflection elements (32) of the said water-tube ends.
  3. Water heater according to Claim 2, characterized in that the battlement-like portions (28) of the side walls (14, 16), the said portions being formed between the recesses (22), are provided with channel-shaped depressions (30) for gap-free bearing contact against the outer fins (24) of the heat exchanger (20).
  4. Water heater according to one of Claims 1 to 3, the cooled combustion chamber (10) having an approximately rectangular cross section, the walls of which consist of consist of two interconnected wall plates which bear against one another and are provided with local shaped-out portions for forming the duct system which carries the heating water and which extends, in the inlet region of the combustion chamber (10), beyond the corner regions of the latter, and the combustion chamber (10) having, in the inlet region, a larger corner radius r2 and, in the region receiving the heat exchanger (20), a smaller corner radius r1 preferably adapted to the profile of the finned block and formed by the wall plates (38, 40) being drawn from the inside outwards.
  5. Water heater according to Claim 4, characterized in that the duct system (46) is led along the rear wall (12) and/or the front wall (18) of the combustion chamber (10) up to the top edge of the heat exchanger (20).
  6. Water heater according to Claim 4 or 5, the walls of the combustion chamber (10) consisting of two wall plates made of high-grade steel, which bear against one another and are welded to one another and which are provided with local shaped-out portions for forming ducts for a fluid, in particular heating water, and the wall plates (38, 40) being connected to one another by means of weld seams (48) running along the duct edges, and the ducts (46) being formed, after welding, by the shaping-out of the plate regions (42, 44) located between the weld seams (48), by means of a fluid working medium introduced with pressure force between the wall plates (38, 40).
  7. Water heater according to Claim 1, characterized in that the means are designed as flexible water-carrying lines (70, 72).
  8. Water heater according to Claim 7, characterized in that the flexible line (70, 72) consists of a rubber hose with a wire-cloth sheathing.
  9. Water heater according to Claim 1, characterized in that the means are designed as a rotary joint (78, 80).
  10. Water heater according to Claim 1, characterized in that two connection elements (56, 57) connected to the means (70, 72, or 78, 80) are arranged at a height on the right and left lower corner region of the water-cooled front wall (18), with the result that the front wall (18) can be swung away or pivoted away forwards.
  11. Water heater according to Claim 10, characterized in that the ducts (46h) arranged in the front wall (81) are designed in such a way that the heating water flowing in them is led specifically from the connection (56) to the connection (57).
  12. Water heater according to Claim 11, characterized in that the flow cross section of the ducts (46h) decreases towards the connection (57).
EP19970109434 1996-07-01 1997-06-11 Gas fired water heater and water cooled combustion chamber Expired - Lifetime EP0816776B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19626325 1996-07-01
DE19626325 1996-07-01
DE19722865A DE19722865A1 (en) 1996-07-01 1997-05-31 Gas-heated water heater and water-cooled combustion chamber
DE19722865 1997-05-31

Publications (3)

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

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EP19970109434 Expired - Lifetime EP0816776B1 (en) 1996-07-01 1997-06-11 Gas fired water heater and water cooled combustion chamber

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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 (en) * 1997-12-09 1999-06-10 Bosch Gmbh Robert Method and device for removing gas bubbles from a double-walled water-cooled combustion chamber of a water heater
CN108826689A (en) * 2018-07-26 2018-11-16 广东万家乐燃气具有限公司 A kind of efficient storage heat exchanger and water heater

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2050273A1 (en) * 1969-07-11 1971-04-02 Calotech Ets
DE2742854C2 (en) * 1977-09-23 1985-05-02 Robert Bosch Gmbh, 7000 Stuttgart Water heater with a gas or oil burner
FR2595796B1 (en) * 1986-03-14 1988-06-17 Chaffoteaux Et Maury IMPROVEMENTS ON THE BODY FOR GAS WATER HEATERS
DE59202027D1 (en) * 1991-05-21 1995-06-01 Vaillant Joh Gmbh & Co Double-walled heating shaft of a hot water device.
DE4224212A1 (en) * 1991-07-22 1993-01-28 Vaillant Joh Gmbh & Co Double-walled combustion chamber for water heater - has lamellar tubes, surrounded on opposite sides by top sections of double jacket
AT403199B (en) * 1994-08-03 1997-11-25 Vaillant Gmbh HEATER

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

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