EP0816777B1 - Verfahren zur Herstellung einer Brennkammer, insbesondere für gasbeheizte Wassererhitzer, und nach dem Verfahren hergestellte Brennkammer - Google Patents
Verfahren zur Herstellung einer Brennkammer, insbesondere für gasbeheizte Wassererhitzer, und nach dem Verfahren hergestellte Brennkammer Download PDFInfo
- Publication number
- EP0816777B1 EP0816777B1 EP19970109618 EP97109618A EP0816777B1 EP 0816777 B1 EP0816777 B1 EP 0816777B1 EP 19970109618 EP19970109618 EP 19970109618 EP 97109618 A EP97109618 A EP 97109618A EP 0816777 B1 EP0816777 B1 EP 0816777B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- combustion chamber
- wall
- weld seams
- ducts
- wall panels
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
- F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
- F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
- F24H1/124—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium using fluid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
- F24H1/24—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
- F24H1/44—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with combinations of two or more of the types covered by groups F24H1/24 - F24H1/40 , e.g. boilers having a combination of features covered by F24H1/24 - F24H1/40
Definitions
- the invention is based on a method of manufacture a combustion chamber according to the preamble of claim 1 and one Combustion chamber for gas-fired Water heater according to the preamble of claim 13.
- WO 92/20976 A1 describes a method for producing a Combustion chamber known, the walls of which are two together welded wall plates exist, the channels after welding the wall panels along the later channel edges by shaping the between the welds themselves located sheet metal areas by means of a pressure between the wall sheets introduced fluid working fluid formed become.
- the recesses of the inner tool open out immediately in front of the corners in excess to accommodate Recessed pockets for materials. This will make one Stiffening achieves greater stability contributes when a heat exchanger for water to be heated is mounted on the combustion chamber. In addition, one Counteracted wrinkling of the inner wall plate.
- the weld seams connecting the wall panels are used in the Manufacture of channels for the water-cooled combustion chamber in advantageously not directly between the inner and supported outer tool.
- the welds as well as the adjacent sheet metal areas are thus at Making the channels stretched, reducing tensile strength increased, and the wall thickness of the sheet metal areas reduced becomes.
- Working equipment can simply be one of the two wall plates welding to the other wall panel with an opening be provided, which can also be used to connect a Line for a fluid resource, in particular Heating water.
- This opening is expedient in a dome-like Spreading of the wall plate is provided to reduce pressure losses in the flow of work equipment and operating supplies increases slightly hold.
- the Wrinkles in the corners of the wall panels can also be counteracted if the weld seams like this be arranged that common chambers over the Extend corner areas of the wall panels.
- the same purpose serves the proposal to offset the start of the individual channels to arrange each other.
- the present invention further proposes that the Ends of the weld seams tapering in a circular line be carried out. This ensures that the Transition of the individual channels into the common chambers result in uniform, "pillow-shaped" widenings and therefore an impermissibly high stress on the material is avoided.
- FIG. 1 shows a perspective view a combustion chamber for gas-fired water heaters with a lifted upwards as a slat block with passed through water pipes trained heat exchanger and one detachable with the side walls of the combustion chamber connectable front wall
- Figure 2 on an enlarged scale a vertical section through the side wall of the Combustion chamber and a partial section through the attached Heat exchanger according to Figure 1
- Figure 3 is a plan view one of two welded wall plates existing circuit board, which after welding to a die Rear wall and the two side walls of the combustion chamber forming the U-shaped part
- Figure 4 is a enlarged section along the line IV in Figure 3
- Figure 5 a cross section through a corner region of the combustion chamber, in the entrance area in front of the heat exchanger
- 6 shows a cross section corresponding to FIG.
- FIG. 5 an alternative corner area of the combustion chamber
- Figure 7 is a plan view of a corner area of the Combustion chamber
- Figure 8 is a partial section through a alternative design of the front wall
- FIG. 9 and FIG. 10 Partial cuts through an inner and outer Tool existing device for receiving the U-shaped curved combustion chamber
- Figure 11 is a stress-strain diagram.
- the water heater has a combustion chamber (10) with a Rear wall (12) and two integrally connected to this Side walls (14, 16) on which a front wall (18) can be detached is attached.
- the combustion chamber (10) is from above Heat exchanger (20) can be placed on it as a lamella block performed water pipes is formed.
- the sidewalls (14, 16) of the combustion chamber (10) are with the upper front edge provided open recesses (22) to the fit Inclusion of protruding from the outer slats (24) Tube ends (26) ( Figure 2) of the heat exchanger (20) are used.
- the crenellated between the recesses (22) Sections (28) of the side walls (14, 16) are with bead-shaped depressions (30) provided on the outer slats (24) fit without gaps and the Set the heat exchanger (20) without play.
- the pipe ends (26) are connected to one another by caps (32a, b, c) also the connections (34, 36) of the heat exchanger (20) are provided.
- the combustion chamber walls each consist of two together adjacent and welded wall plates (38.40) made of stainless steel, the molded sheet metal areas (42.44) have, between which a further below described channel system (46) for the combustion chamber (10) cooling heating water flow is formed.
- the Channel system (46) is produced in that the Wall plates (38.40) initially still in their essence flat initial shape due to straight weld seams (48) be connected to each other and only then the duct system (46) by shaping the between the weld seams (48) located sheet metal areas (42, 44) by means of a Pressing pressure inserted between the wall plates (38.40) fluid working fluid is formed.
- the channel system (46) in the rear wall (12) and Sidewalls (14, 16) is in accordance with the settlement of these Wall parts according to Figure 3 formed by one closed all-round weld seam (48a) and four straight weld seams (48b, c, d, e).
- there are two individual channels (46a) in the side wall (14) connected to one another via a chamber (46b) are and opens into a chamber (46c).
- Three of these lead parallel individual channels (46d) in the rear wall (12) further in a chamber (46e) which has two individual channels (46f) in the Sidewall (16) connected to an outer chamber (46g) is.
- dome-like features (50) with openings (52) for inserting connecting pieces (54) are molded into the outer wall plate at the connection points of the duct system (46).
- the front wall (18) is provided with connection elements (56).
- the circuit board shown in FIG. 3 is bent into the U-shape according to FIG. 1 with a bending radius r 2 using a bending device (not shown ) .
- the lines (58) drawn with dashed lines in FIG. 3 show the position and the limits of the corner regions which form, hereinafter referred to as bending zones (60).
- the combustion chamber 10 After the combustion chamber 10 has been bent into a U shape, it is clamped into a device (FIG. 9) consisting of an inner (80) and an outer tool (82), the two bending zones (60) of the inner wall plate 40 being on the inner one Place the tool (80) on.
- the bending radius of the inner tool (80) coincides with the bending radius r 2 of the inner wall plate (40).
- recesses are formed between the inner wall plate (40) and the inner tool (80) and between the outer wall plate (38) and the outer tool (82) there are clearances for the duct system (46) to be produced.
- the fluid working fluid for expanding the between the Weld seams (48) lying sheet metal areas (42,44) pressed between the wall plates (38.40), the to be formed sheet metal areas (42,44) in the recesses and the distances are pushed in.
- Bending zones (60) are only the outer wall plate (38) deformed outside, while the inner wall plate (40) in this Area remains undeformed.
- the outer tool (82) is in the bending zones (60) with a greater distance from the outside Provide wall plate (38). This can make it stronger Dimensions than in the stretched channel areas to the outside expand.
- the device is in the outer tool (82) in the Bending zones (60) on a counterpart for limiting the outer wall plate (38) dispensed with because of a defined pressure supply the desired channel width a can be manufactured.
- the weld seams (48) connecting the inner and outer wall plates (38, 40) to form the channel system (46) are deliberately not supported when the plate regions (42, 44) are expanded.
- a tensile force is applied to the weld seams (48) and to the adjacent sheet metal areas and the material is stretched.
- This stretching takes place as shown in the stress-strain diagram in FIG. 11, up to the plastic region with a permanent strain ⁇ r .
- the line a shown in broken lines shows the stress-strain curve for the stretching method used, while line b represents a comparable curve curve without stretching.
- the duct system (46) to be produced is based on a minimum flow cross section a min , which ensures adequate cooling of the combustion chamber (10). Therefore, the arrangement is such that the largest possible cooling of the combustion chamber (10), the channel width is selected both in the stretched channel area (sum of depth b and width c) and in the corner area (width a) so that the minimum flow cross section a min is observed.
- the width a of the flow cross section in the Bending zones (60) equal to the sum of the depth b and the Width c selected in the stretched channel area.
- the inside is Tool (80) next to the bending zones (60) locally provided recesses so that there are excess material (62) of the inner wall plate (40) can mold into it.
- the inner tool (80) each with a trough-shaped depression to form a dome-shaped bulge of the inner wall plate (40) provided, whereby the flow resistance at the entrance and further reduced at the exit of the channel system (46).
- the weld seams running between the individual channels (48) have circular ends (66), so the sheet metal material there when the individual channels are widened Bulge without pillows without the risk of cracking can.
- the circle diameter of the ends (66) should not be smaller than 5 mm, but also not larger than 15 mm the consequent loss of more effective Keep heat transfer surface within reasonable limits. at a preferred embodiment was the circle diameter 12 mm selected. Wrinkling is also caused by the counteracted further measure that the ends (66) of the parallel channels (48c, d or 48g, h) offset to be arranged to each other.
- the channel system (46) in the rear wall (12) extends up to the area overlapping the heat exchanger (20) and that there the wall plates (38, 40) in the bending zones (60) directly against one another issue.
- the combustion chamber (10) has a corner radius r 1 of, for example, 5 mm in this upper region, which closely surrounds the heat exchanger (20), whereas in the corner regions of the combustion chamber (10) below, over which the chambers (46c, e) of the Extend channel system (46), the corner radius r 2 is dimensioned much larger and is, for example, 20 mm.
- transition from one corner radius to the other is made without gaps in that the entire board, after it has been bent with the larger corner radius r 2 and is supported between the inner and outer tool, is stretched with the smaller corner radius r 1 by stretching the wall plates (38.40) is molded from the inside out.
- the individual channels of the channel system (46) are through the Weld seams (48) immediately limited, so that at their Longitudinal edges (78) ( Figure 2) do not form any gaps in which corrosion products could deposit.
- the welds (48) are in the practically still flat condition of the wall sheets (38.40), which makes manufacturing easier.
- Through the detachable connections of the heat exchanger (20) and Front wall (18) of the other wall parts (12, 14, 16) of the Combustion chamber (10) will maintain and assemble the Heat exchanger (20), and the manufacture of the combustion chamber (10) relieved.
- the connections (54, 56) of the duct system (46) are advantageously placed so that the channel system of is flowed through from the bottom up. This makes it possible Bleed the system more easily.
- the heating efficiency can be improved when the heat transfer from heating gas to the combustion chamber wall by increasing the radiation number y increased due to oxidation or blackening of the inner surface becomes.
- the front wall (68) shown in FIG. 8 consists of an outer wall plate (70) and one in parallel spacing arranged inner wall plate (72), which consists of a particularly temperature-resistant material.
- inner wall plate (72) On the Inside of the wall plate (70) is preferably one shiny metallic radiation protection layer (74), optionally in the form of an additional sheet metal part, intended.
- the between the two wall plates (70.72) formed space (76) goes through one Air flow, the heat absorbed there to the heat exchanger (20) transported.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Details Of Fluid Heaters (AREA)
- Gas Burners (AREA)
Description
Claims (15)
- Verfahren zur Herstellung einer Brennkammer, insbesondere für gasbeheizte Wassererhitzer, deren Wände aus miteinander verschweißten inneren und äußeren Wandblechen (42, 44) gebildet sind, die mit örtlichen Ausformungen zur Bildung von Kanälen (46) für ein Fluid, insbesondere für als Kühlmittel dienendes Heizungswasser, versehen sind, wobei die Kanäle (46) nach dem Verschweißen entlang der späteren Kanalränder durch Ausformen der zwischen den Schweißnähten (48) sich befindenden Blechbereiche (42, 44) mittels eines mit Druck zwischen die Wandbleche (38, 40) eingeführten fluiden Arbeitsmittels gebildet werden und wobei die Wände mit den verschweißten Wandblechen Biegezonen (60) aufweisen, in denen die Wände zur Brennkammer gebogen werden, dadurch gekennzeichnet, dass das innere Wandblech (40) vor dem Zuführen des fluiden Arbeitsmittels in der Biegezone (60) auf einem inneren Werkzeug (80) abgestützt wird und das äußere Wandblech (38) zu einem äußeren Werkzeug (82) einen Abstand bildet, der nach dem Zuführen des fluiden Arbeitsmittels die Grenzen für die Ausformung der Kanäle (46) bildet, wobei der Abstand des äußeren Werkzeuges (82) zum äußeren Wandblech (38) in der Biegezone (60) größer als in den gestreckten Stützbereichen bemessen wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das innere Werkzeug (80) vor der Biegezone (60) mindestens eine Ausnehmung aufweist, die zur Aufnahme überschüssigen Materials (62) diendende vertiefte Taschen am inneren Wandblech (40) ausbildet.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Schweissnähte (48) sowie die daran angrenzenden Blechbereiche (42, 44) bei der Herstellung der Kanäle (46) gereckt werden, indem die Schweissnähte zwischen dem inneren Werkzeug (80) und dem äußeren Werkzeug (82) abstützungsfrei angeordnet werden.
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass das Recken bis in den plastischen Bereich mit einer bleibenden Dehnung εr erfolgt.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Schweissnähte (48) so angeordnet werden, dass sich gemeinsame Kammern (46c, e) über die Eckenbereiche der Wandbleche (38, 40) erstrecken.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das äußere Wandblech (38) vor dem Verschweissen mit dem inneren Wandblech (40) mit einer Öffnung (52) zum Zuführen des fluiden Arbeitsmittels und späteren Anschliessen einer Leitung für ein fluides Betriebsmittel, insbesondere Heizungswasser, versehen wird.
- Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass die Öffnung (52) in einer domartigen Ausprägung (50) des Wandblechs (38) vorgesehen wird.
- Verfahren nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Schweissnähte (48) so angeordnet und ausgebildet werden, dass sich parallel verlaufende Einzelkanäle (46 a, d, f, h) und in deren Eingangs- und Ausgangsbereichen gemeinsame Kammern (46 b, c, e, g, i, j) ergeben, und ferner, dass die Öffnungen (52) für die Anschlussleitungen im Bereich der außenliegenden Kammern (46 b, g i , j) vorgesehen sind.
- Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass die Schweissnähte (48) so angeordnet werden, dass sich gemeinsame Kammern (46c, e) über die Eckenbereiche der Wandbleche (38, 40) erstrecken.
- Verfahren nnach Anspruch 8 oder 9, dadurch gekennzeichnet, dass der Beginn der Einzelkanälen (46 d, h) zueinander versetzt angeordnet wird.
- Verfahren nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, dass die Enden (66) der Schweissnähte (48) kreislinienförmig auslaufend ausgeführt werden.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die miteinander verschweissten Wandbleche (38, 40) zu einem die Rückwand (12) und die Seitenwände (14, 16) der Brennkammer (10) bildenden U-förmigen Körper gebogen werden und die Vorderwand (18) der Brennkammer (10) als getrenntes Teil hergestellt und mit den Seitenwänden (14, 16) lösbar verbindbar ausgeführt sind.
- Brennkammer für gasbeheizte Wassererhitzer hergestellt nach einem der Ansprüche 1 bis 12, deren Wände aus zwei miteinander verschweissten Wandblechen (42, 44) bestehen, zwischen denen in örtlichen Ausformungen Kanäle (46) für einen die Brennkammer (10) kühlenden Wasserdurchlauf gebildet sind, dadurch gekennzeichnet, dass der minimale Strömungsquerschnitt amin der für eine Kühlung der Brennkammer (10) notwendigen Durchflussmenge für das Fluid, insbesondere Heizungswasser, entspricht, und dass bei einer vorgegebenen Kühlfläche für die Brennkammer (10) die Kanalbreite sowohl im gestreckten Kanalbereich als auch im Eckenbereich der Biegezone (60) größer oder gleich dem minimalen Strömungsquerschnitt amin ist.
- Brennkammer nach Anspruch 13, dadurch gekennzeichnet, dass im gestreckten Kanalbereich die Tiefe (b) der Ausnehmung gleich der Breite (c) des Abstandes ist.
- Brennkammer nach Anspruch 13 oder 14, dadurch gekennzeichnet, dass die Breite (a) des Strömungsquerschnitts in den Biegezonen (60) gleich der Summe aus der Tiefe (b) der Ausnehmung und der Breite (c) des Abstandes im gestreckten kanalbereich ist.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19626322 | 1996-07-01 | ||
DE19626322 | 1996-07-01 | ||
DE19722289 | 1997-05-28 | ||
DE19722289A DE19722289A1 (de) | 1996-07-01 | 1997-05-28 | Verfahren zur Herstellung einer Brennkammer, insbesondere für gasbeheizte Wassererhitzer und nach dem Verfahren hergestellte Brennkammer |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0816777A2 EP0816777A2 (de) | 1998-01-07 |
EP0816777A3 EP0816777A3 (de) | 1999-01-07 |
EP0816777B1 true EP0816777B1 (de) | 2002-12-18 |
Family
ID=26027077
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19970109618 Expired - Lifetime EP0816777B1 (de) | 1996-07-01 | 1997-06-13 | Verfahren zur Herstellung einer Brennkammer, insbesondere für gasbeheizte Wassererhitzer, und nach dem Verfahren hergestellte Brennkammer |
Country Status (1)
Country | Link |
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EP (1) | EP0816777B1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AUPQ792400A0 (en) * | 2000-06-02 | 2000-06-29 | Southcorp Australia Pty Ltd | Improved heat exchange element |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE122777T1 (de) * | 1991-01-25 | 1995-06-15 | Vaillant Gmbh | Brennkammer mit doppelmantel. |
WO1992020976A1 (de) * | 1991-05-21 | 1992-11-26 | Joh. Vaillant Gmbh U. Co. | Verfahren zur herstellung eines doppelwandigen heizschachtes |
DE4224212A1 (de) * | 1991-07-22 | 1993-01-28 | Vaillant Joh Gmbh & Co | Doppelwandiger heizschacht |
-
1997
- 1997-06-13 EP EP19970109618 patent/EP0816777B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0816777A2 (de) | 1998-01-07 |
EP0816777A3 (de) | 1999-01-07 |
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