EP3141838B1 - Abstandskamm und wärmetauscher mit besagtem abstandskamm und verfahren zur herstellung von besagtem abstandskamm - Google Patents

Abstandskamm und wärmetauscher mit besagtem abstandskamm und verfahren zur herstellung von besagtem abstandskamm Download PDF

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Publication number
EP3141838B1
EP3141838B1 EP16187754.3A EP16187754A EP3141838B1 EP 3141838 B1 EP3141838 B1 EP 3141838B1 EP 16187754 A EP16187754 A EP 16187754A EP 3141838 B1 EP3141838 B1 EP 3141838B1
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EP
European Patent Office
Prior art keywords
longitudinal axis
base
tabs
heat exchanger
spacing comb
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.)
Active
Application number
EP16187754.3A
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English (en)
French (fr)
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EP3141838A1 (de
Inventor
Stefano Casiraghi
Noè Ciofolo
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.)
Riello SpA
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Riello SpA
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Publication date
Application filed by Riello SpA filed Critical Riello SpA
Priority to PL16187754T priority Critical patent/PL3141838T3/pl
Publication of EP3141838A1 publication Critical patent/EP3141838A1/de
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Publication of EP3141838B1 publication Critical patent/EP3141838B1/de
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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
    • F24H1/43—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes helically or spirally coiled
    • 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
    • F24H9/0005—Details for water heaters
    • F24H9/001—Guiding means
    • F24H9/0026—Guiding means in combustion gas channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/007—Auxiliary supports for elements
    • F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies
    • F28F9/0132—Auxiliary supports for elements for tubes or tube-assemblies formed by slats, tie-rods, articulated or expandable rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
    • F28D7/024—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/14—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
    • F28F1/16—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally the means being integral with the element, e.g. formed by extrusion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2240/00—Spacing means

Definitions

  • the present invention relates to a spacing comb for a heat exchanger.
  • the present invention relates to a spacing comb used to space the coils of a tubular member of a heat exchanger of a water heater or domestic boiler.
  • a very commonly found heat exchanger for heating water in water heaters or domestic boilers comprises a casing; and a tubular member wound in a helix around a given axis so as to form a plurality of adjacent coils housed inside the casing.
  • a liquid, generally water, passes through the helically wound tubular member, while combustion fumes, or, more generically, hot gases, containing water vapour flow through the casing, releasing most of the heat to the liquid and condensing the water vapour.
  • the coils are spaced apart from each other so as to form gaps for the path of the combustion fumes.
  • the heat exchanger of the type identified above is configured to define a path for the hot gases that extends between adjacent coils so as to optimize the heat exchange between the hot gases and the liquid.
  • the dimensions of the tubular member, the shape of the cross section of the tubular member, and the size of the gap between adjacent coils are very important design parameters in order to optimize the heat exchange. Examples of spacing combs used for spacing the coils of heat exchangers are shown in the documents EP 1,627,190 B1 , and GB 914,083 .
  • JP2006317036 discloses a spacer formed by cutting and having a plurality of stepped protruding portions of a long rectangular plate-like base portion.
  • KR101496361 discloses a spacer comprising a plurality of twisted bending insert space pieces formed in a support space piece.
  • the purpose of the present invention is to provide a spacing comb that is easy to make and at the same time is capable of satisfying the heat exchanger's design parameters.
  • a spacing comb for a heat exchanger is achieved in accordance with the present invention, wherein the heat exchanger comprises a tubular member which is configured to convey water to be heated, and is wound in a helix about a given axis in order to form a plurality of adjacent coils and housed in the casing; the spacing comb being configured so as to keep the adjacent coils a given distance apart and being made from a metal sheet blank which extends along a longitudinal axis and comprises a base; a plurality of tabs, which are placed partially side by side along the longitudinal axis and are configured for being bent at right angles with respect to the base so as to define a plurality of spacers supported by the base.
  • the spacing comb in accordance with the present invention enables it to be made starting from a blank sheet of the tabs, i.e. of the spacers, each having a length greater than the pitch of the tabs themselves.
  • the tabs are V-shaped and are - before being bent so as to define said plurality of spacers-inserted one into the other, partly, along the longitudinal axis.
  • the particular V-shape configuration makes it possible to give the tabs a particular solidity and to make tabs having a length greater than the pitch of the tabs.
  • the tabs are bent about bend lines perpendicular to the longitudinal axis.
  • the bending lines are distributed along the longitudinal axis with a constant pitch.
  • the spacing comb comprises two end wings, which are bent with respect to the base around further bending lines parallel to the longitudinal axis and extending from opposite sides of the tabs with respect to the base.
  • the end wings give the spacing comb greater stiffness along the longitudinal axis A1.
  • the wings also have a fluid dynamic function.
  • a further purpose of the present invention is to provide a heat exchanger.
  • a heat exchanger for a water heater or domestic boiler comprising a casing and a tubular member, which is configured to convey the water, and is wound in a helix around a given axis to form a plurality of adjacent coils and is housed within the casing; and at least two spacing combs with at least one of the salient characteristics identified above.
  • the helically wound tubular member defines a cylindrical compartment inside the casing into which hot gases are admitted and an annular compartment from which the gases are evacuated.
  • a further purpose of the present invention is to provide a method for making a spacing comb for a heat exchanger.
  • a method for making a spacing comb for a heat exchanger comprising the steps of:
  • the method according to the present invention makes it possible to provide tabs having a length greater than the pitch of the tabs.
  • the method also provides for bending the tabs about folding lines perpendicular to the longitudinal axis and distributed uniformly along the longitudinal axis.
  • the method also provides for the step of bending two end wings with respect to the base about further folding lines parallel to the longitudinal axis so that the end wings extend on the opposite sides of the tabs with respect to the base.
  • the heat exchanger 1 denotes in its entirety a heat exchanger, which in this case is a condensing heat exchanger for heating water in a water heater or a domestic boiler.
  • the heat exchanger 1 comprises a casing 2 of cylindrical shape; and a tubular member 3, which is wound, partly, in a helix around an axis A to form the coils 4.
  • the tubular member 3 is made from aluminium or an aluminium based alloy, extruded and then wound in a helix.
  • the casing 2 comprises a side wall 5 of substantially cylindrical shape and preferably made from a metallic material such as aluminium, or a plastic material; an end wall 6 being substantially disc-shaped and an end wall 7 having a substantially annular shape.
  • the end walls 6 and 7 are attached to the side wall 5 so as to form the casing 2 and a combustion fumes flow chamber.
  • the end wall 7 has a central aperture 8 and is configured to support a cylindrically-shaped burner, not shown in the attached Figures, which is arranged, partly, within the combustion fumes flow chamber.
  • the hot fumes are conveyed through the central aperture 8.
  • the side wall 5 comprises an aperture 9 through which combustion fumes are extracted and an aperture, not shown, for extracting the condensate.
  • the helically wound tubular member 3 defines a cylindrical compartment inside the casing 2 into which hot gases are admitted and an annular compartment from which gases are evacuated.
  • the heat exchanger 1 further comprises two spacing combs 10 each of which has a plurality of tabs 11 arranged between the coils 4 and which function as spacers to precisely define the interstices, as better illustrated in Figure 2 .
  • the cross-section of the tubular member 3 is very flattened and has two walls 12 facing each other with a very large radius of curvature and two walls 13 facing each other with a much smaller radius of curvature than the radius of curvature of the walls 12 and which are much shorter than the walls 12.
  • the tubular member 3 also has wings 14 along the walls 13. Accordingly, the cross-section as a whole has much larger dimensions in the radial direction with respect to the axis A ( Figure 1 ) than in its axial dimensions with respect to the axis A ( Figure 1 ).
  • the spacing of the coils 4 is very small. In the light of these design parameters of the heat exchanger 1, the length L of the tabs 11 is significantly greater than the pitch P of the tabs 11.
  • the spacing comb 10 extends along a longitudinal axis A1, and comprises a base 15 for supporting the plurality of tabs 11 and two wings 16.
  • Each tab 11 forms a right angle with respect to the base 15 corresponding with a respective bending line 17 perpendicular to the longitudinal axis A1.
  • each tab is V-shaped and is attached to the base 15 corresponding with two section of the folding line 17, while the apex of the V defines the free end.
  • Each end wing 16 forms an angle with the base 15 corresponding with a respective folding line 18 parallel to the longitudinal axis A1.
  • the end wings 16 have the function of stiffening the spacing comb 10 and, at the same time, the function of slowing down the flow of the gases in the circumferential direction along the tubular compartment.
  • the distance between the free end of the end wing 16 and the cylindrical part defines the section in which the gases travel in a circumferential direction.
  • the free ends of the end wings 16 have an indented profile.
  • the spacing comb 10 is obtained by shearing and bending a metal sheet 19 as better shown in Figure 6 .
  • the method involves selecting a sheet 19 with a thickness equal to the size of the gaps.
  • a blank 20 is sheared from the sheet metal 19, which comprises the base 15, the tabs 11 lying in the same plane as the base 15, and the wings 16 lying on the same plane of the base 15.
  • the wings 16 are located side by side, partly along the longitudinal axis A1, and are joined to the base solely corresponding with the folding lines 17.
  • the tabs 11 and the wings 16 are folded about the respective fold lines 17 and 18 on opposite sides with respect to the base 15.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Claims (9)

  1. Ein Abstandskamm für einen Wärmetauscher, wobei der Wärmetauscher (1) ein rohförmiges Teil (3) aufweist, welches derart ausgebildet ist, dass dieses Wasser leitet, und in einer Helix um eine vorgegebene Achse (A) gewunden ist, um eine Mehrzahl von benachbarten Wicklungen (4) zu bilden; wobei der Abstandskamm (10) derart ausgebildet ist, dass die benachbarten Wicklungen (4) in einem vorgegebenen Abstand voneinander gehalten werden, und der Abstandskamm (10) aus einem metallischen, plattenförmigen Rohling (20) besteht, der sich entlang einer Längsachse (A1) erstreckt und ein Basisteil (15) aufweist; eine Mehrzahl von Streifen (11), welche Seite an Seite entlang der Längsachse (A1) teilweise angeordnet sind und zum Biegen in rechten Winkeln in Bezug auf das Basisteil (15) derart ausgebildet sind, dass sie ein Mehrzahl von Abstandshaltern bilden, die von dem Basisteil (15) gehalten werden, dadurch gekennzeichnet, dass die Streifen (11) V-förmig sind und - vor dem Biegen, so dass sie die Mehrzahl von Abstandshaltern bilden - einer in den anderen entlang der Längsachse (A1) teilweise eingesetzt sind.
  2. Der Abstandskamm wie in Anspruch 1 beansprucht, wobei die Streifen (11) um eine Faltungslinie (17) rechtwinklig zu der Längsachse (A1) gebogen werden.
  3. Der Abstandskamm wie in irgendeinem der vorausgehenden Ansprüche beansprucht, und aufweisend zwei Endflügel (16), die in Bezug auf das Basisteil (15) um weitere Faltungslinien (18) parallel zu der Längsachse (A1) gebogen sind und sich auf der gegenüberliegenden Seite der Streifen (11) in Bezug auf das Basisteil (15) erstrecken.
  4. Der Abstandskamm wie in Anspruch 3 beansprucht, wobei jeder Endflügel (16) eine freie, eingezogene Kante hat.
  5. Ein Wärmetauscher für einen Haushaltsboiler oder Wassererhitzer, wobei der Wärmetauscher ein Gehäuse (2) aufweist; und ein rohförmiges Teil (3) aufweist, welches derart ausgebildet ist, dass dieses Wasser leitet, und in einer Helix um eine vorgegebene Achse (A) gewunden ist, um eine Mehrzahl von benachbarten Wicklungen (4) zu bilden, die in dem Gehäuse (2) untergebracht sind; und wenigstens zwei Abstandskämme (10) aufweist, von denen jeder die Merkmale hat, die in irgendeinem der Ansprüche 1 bis 4 beansprucht sind, wobei jeder Streifen (11) zwischen zwei benachbarten Windungen (4) zusammengedrückt wird.
  6. Der Wärmetauscher wie in Anspruch 5 beansprucht, wobei das rohrförmige Teil (3), das in einer Helix gewunden ist, ein zylindrisches Kompartiment innerhalb des Gehäuses (2) bildet, in welches heiße Gase geleitet werden, und ein ringförmiges Kompartiment bildet, von dem die Gase evakuiert werden.
  7. Ein Verfahren zur Herstellung eines Abstandskamms für einen Wärmetauscher, wobei das Verfahren die folgende Schritte umfasst:
    - Auswählen einer metallischen Platte (19) mit einer Dicke, die den Abmessungen der Zwischenräume zwischen den benachbarten Windungen (4) des Wärmetauschers (1) entspricht;
    - Abscheren eines Rohlings (20) von der metallischen Platte (19), der sich entlang einer Längsachse (A1) erstreckt und ein Basisteil (15) aufweist; einer Mehrzahl von Streifen (11), welche Seite an Seite entlang der Längsachse (A1) teilweise angeordnet sind; wobei die Streifen (11) V-förmig sind und einer in den anderen entlang der Längsachse (A1) teilweise eingesetzt sind; und
    - Biegen der Streifen (11) in rechten Winkeln in Bezug auf das Basisteil (15), so dass sie ein Mehrzahl von Abstandshaltern bilden, die von dem Basisteil (15) gehalten werden.
  8. Das Verfahren wie in Anspruch 8 beansprucht, und umfassend den Schritt des Biegens der Streifen (11) um Faltungslinien (17) rechtwinklig zu der Längsachse (A1) und gleichmäßig verteilt entlang der Längsachse (A1).
  9. Das Verfahren wie in Anspruch 8 oder 9 beansprucht, und umfassend den Schritt des Biegens von zwei Endflügeln (16) in Bezug auf das Basisteil (15) um weitere Faltungslinien (18) parallel zu der Längsachse (A1), so dass die Endflügel (16) sich auf den gegenüberliegenden Seiten der Streifen (11) in Bezug auf das Basisteil (15) erstrecken.
EP16187754.3A 2015-09-08 2016-09-08 Abstandskamm und wärmetauscher mit besagtem abstandskamm und verfahren zur herstellung von besagtem abstandskamm Active EP3141838B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL16187754T PL3141838T3 (pl) 2015-09-08 2016-09-08 Grzebień dystansowy i wymiennik ciepła zawierający wymieniony grzebień dystansowy i sposób wytwarzania wymienionego grzebienia dystansowego

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUB2015A003489A ITUB20153489A1 (it) 2015-09-08 2015-09-08 Pettine distanziale, scambiatore di calore comprendente tale pettine distanziale e metodo per realizzare tale pettine distanziale

Publications (2)

Publication Number Publication Date
EP3141838A1 EP3141838A1 (de) 2017-03-15
EP3141838B1 true EP3141838B1 (de) 2020-05-27

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EP16187754.3A Active EP3141838B1 (de) 2015-09-08 2016-09-08 Abstandskamm und wärmetauscher mit besagtem abstandskamm und verfahren zur herstellung von besagtem abstandskamm

Country Status (4)

Country Link
EP (1) EP3141838B1 (de)
ES (1) ES2807257T3 (de)
IT (1) ITUB20153489A1 (de)
PL (1) PL3141838T3 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023285680A1 (fr) * 2021-07-16 2023-01-19 Sermeta Echangeur de chaleur
RU2849784C2 (ru) * 2021-07-16 2025-10-29 Сермета Конденсационный теплообменник

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3125327B1 (fr) * 2021-07-16 2023-09-29 Sermeta Echangeur de chaleur à condensation.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB914083A (en) 1960-10-13 1962-12-28 Bundy Tubing Co Improvements in or relating to heat exchange coils and method and apparatus for manufacturing the same
ITMI20030769A1 (it) 2003-04-11 2004-10-12 Riello Spa Scambiatore di calore, metodo di realizzazione di tale scambiatore e caldaia comprendente tale scambiatore.
JP2006317036A (ja) * 2005-05-10 2006-11-24 Noritz Corp 熱交換器およびこれを備えた温水装置
KR101496361B1 (ko) * 2014-07-09 2015-02-26 주식회사 두발 스페이서를 활용한 콘덴싱 보일러용 열교환기

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023285680A1 (fr) * 2021-07-16 2023-01-19 Sermeta Echangeur de chaleur
FR3125326A1 (fr) * 2021-07-16 2023-01-20 Sermeta Echangeur de chaleur
RU2849784C2 (ru) * 2021-07-16 2025-10-29 Сермета Конденсационный теплообменник
US12474123B2 (en) 2021-07-16 2025-11-18 Sermeta Heat exchanger

Also Published As

Publication number Publication date
EP3141838A1 (de) 2017-03-15
PL3141838T3 (pl) 2020-11-16
ES2807257T3 (es) 2021-02-22
ITUB20153489A1 (it) 2017-03-08

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