BE1000721A4 - Heat exchanger for domestic use - comprises three coaxial tubes sealed at ends by O=rings, with central tube being twisted and with helical swell - Google Patents

Heat exchanger for domestic use - comprises three coaxial tubes sealed at ends by O=rings, with central tube being twisted and with helical swell Download PDF

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Publication number
BE1000721A4
BE1000721A4 BE8700597A BE8700597A BE1000721A4 BE 1000721 A4 BE1000721 A4 BE 1000721A4 BE 8700597 A BE8700597 A BE 8700597A BE 8700597 A BE8700597 A BE 8700597A BE 1000721 A4 BE1000721 A4 BE 1000721A4
Authority
BE
Belgium
Prior art keywords
tube
heat exchanger
twisted
helical
swell
Prior art date
Application number
BE8700597A
Other languages
French (fr)
Inventor
Vittorio Prelovsek
Franco Frosini
Original Assignee
Nuovo Pignone Spa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nuovo Pignone Spa filed Critical Nuovo Pignone Spa
Priority to BE8700597A priority Critical patent/BE1000721A4/en
Application granted granted Critical
Publication of BE1000721A4 publication Critical patent/BE1000721A4/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00Tubular elements; Assemblies of tubular elements
    • F28F1/08Tubular elements crimped or corrugated in longitudinal section
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02Heat-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
    • F28D7/026Heat-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 and formed by bent members, e.g. plates, the coils having a cylindrical configuration

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

Abstract

The heat exchanger comprises a twisted tube which has a helical swell and which is coaxially enclosed between external and internal tubes. One end of the twisted tube is closed and the other end is sealed to the external tube. The one end of the twisted tube is closed by an air vent cap and by one or more O-ring gaskets. The other end of the twisted tube is sealed to the external tube by one or more O-ring gaskets . The helical swell of the twisted tube may be formed by hydromoulding.

Description

       

   <Desc/Clms Page number 1> 
 
 EMI1.1 
 



  Echangeur de chaleur perfectionné, convenant particulierement aux chau- - & resà La présente invention se rapporte ä un type nouveau d'échangeur qui peut etre démonté facilement et rapidement en vue de l'entretien et   du nettoyage-s- et   qui convient donc particulièrement ä une utilisation dans les chaudières à gaz   ä   usage domestique, notamment-pour la produc- tion d'eau chaude. 



   Comme il est bien connu de l'homme de l'art, dans ces   chaudiè-   res, l'eau chaude est chauffée par l'intermédiaire d'un échangeur de chaleur. 



   Dans l'état actuel de la technique, divers types   d'echangeurs   de chaleur appropriés sont déj  connus. 



   L'échangeur de chaleur le plus largement utilisé est celui qui comporte un serpentin dans lequel    s'écoule   l'eau chaude, et qui est 
 EMI1.2 
 nveloppé---eeeurement un echangeur de chaleur de ce type présente l'inconvénient important de n'être pas facilement accessible, de sorte que les dépôts calcaires restant dans le serpentin contenant l'eau chaude, qui est généralement une eau dure, ne peuvent être enleves si ce n'est par des moyens chimi- 
 EMI1.3 
 ques et, par conséquent, d'une manière qui n'est ni sure ni contra- lable. 



   D'autres types   cönnus   d'échangeur de chaleur, tels que les types à plateaux ou ceux qui comportent plusieurs serpentins amovibles, éliminent la difficulté mentionnée ci-dessus mais cependant sont défavorablement affectés par la présence nécessaire de joints d'étanchéité qui, en cas de rupture, n'empêchent pas le transfert des liquides,   c'est-à-dire   le mélange de l'eau chaude   avec l'eau   du systeme de chauffage. En outre, du fait qu'ils font appel à des techniques plus compli- 
 EMI1.4 
 quées de fabrication, ces joints augmentent le coût de l'appareil. 



  La présente invention a expressément pour objet d'éliminer les inconvénients mentionnes ci-dessus, en fournissant donc un échangeur de chaleur qui permette d'accéder facilement ä la surface d'echange. de chaleur exposee   l'eau chaude et qui permette, par conséquent, 

 <Desc/Clms Page number 2> 

 
 EMI2.1 
 t d'éliminer   completement   tous les dépôts calcaires de cette surface ; qui soit simple, compact et donc économique et qui assure également une sécurité constante de fonctionnement sans possibilité de transfert des fluides. 



   Cet objet est sensiblement atteint par un tube de forme appropriée qui, présentant un renflement torsadé en helice et obtenu par moulage hydraulique, determine respectivement au moyen d'un tube coaxialintérieuretd'untubeextérieur, égalementcoaxial,lesdeux trajets   hélicoïdaux   d'écoulement utilises pour le retour d'eau chaude du système de chauffage, qui s'eleve dans le tube   interieur,   et pour l'eauàchauffer. 



   De cette manière, l'échangeur de chaleur dans son ensemble est formé de trois tubes simplement emboîtés coaxialement les uns dans les autres et formant un système qui est compact et   faei 1 e   démonter   et est donc d'accès aisé. En outre, toute possibilité de transfert de fluides est empechee par un double joint torique étanche, prévu à chaque   extrémité   de l'échangeur de chaleur. L'économie du Systeme est évidente en raison du fait que le renflement en helice du tube principal est obtenu simplement par moulage hydraulique. 



   La presente invention sera bien comprise   ä   la lecture de la description suivante faite en relation avec les dessins ci-joints, dans lesquels - la figure 1 représente une vue en perspective, partiellement ecorchee, d'un échangeur de chaleur réalisé suivant la presente invention ; et - la figure 2 est une vue partiellement écorchée,   une   echelle   différente, des trois elements sépares qui forment l'échangeur de chaleur. 



   On se reportera maintenant aux figures. La référence numérique 1 désigne un tube presentant un renflement torsadé en hélice et obtenu par moulage hyraulique ; ce tube est introduit coaxialement, de manière.   ä   se trouver intercale entre un tube intérieur 2 et un tube   exterieur   3. 



   Ce tube torsadé comporte, a son extrémité de base 4, deux joints toriques 5 et 6 qui constituent des joints étanches entre le 

 <Desc/Clms Page number 3> 

 tube 1 et le tube   extérieur   3, et un tube 7 de support qui est simplement fixe par une bride sur l'extrémité du tube 3. L'extrémité du tube torsadé 1 se termine, par contre, par un col 8 qui est ferme   hermeti-   quement, par l'intermédiaire des joints toriques étanches 10 et 11, par 
 EMI3.1 
 un 9 de mise ä nt-U-presse e-- bouchonrebord intérieur 12 formé à l'extrémité supérieure du tube extérieur 3, cree également un joint hermétique d'étanchéité entre le tube 1 et le tube 3. Enfin, le tube intérieur 2 se termine à sa base par un rétrécissement 13 en forme d'entonnoir, de sorte qu'il se crée une chambre 
 EMI3.2 
 co11ectrice d'eau 14'. 



  De cette manière, entre les trois tubes coaxiaux 1, 2 et 3 sont formees deux chambres de forme hél dont la chambre intérieure 14, située entre le tube intérieur 2 et le tube torsadé l, constitue le trajet d'écoulement de retour, dans le sens indique par les flèches 15, de   11 eau   chaude du système de chauffage introduite dans le tube interieur 2 dans le sens indique par la fleche 16. L'autre chambre 17 en 
 EMI3.3 
 - st-si -contrentreetube et 1-e--tube extérieur 3, et est traversee par l'eau à chauffer qui est introduite froide dans la chambre par l'entrée 18 prevue ä la base du tube    forme d'heHee-exterieur   3 et qui est évacuée chaude par la sortie 19 également prevue à   l'extrémité   du tube extérieur 3.

   Le trajet suivi par l'eau chaude dans la chambre 17 est indiqué par les   fleches   20   la figure 1. 



   La presente invention n'est pas-imitée aux exemples de resalisation qui viennent d'etre décrits, elle est au contraire susceptible de variantes et de modifications qui apparaitront       l'homme de l'art.



   <Desc / Clms Page number 1>
 
 EMI1.1
 



  Improved heat exchanger, particularly suitable for heaters - The present invention relates to a new type of exchanger which can be disassembled easily and quickly for maintenance and cleaning-s- and which is therefore particularly suitable for use in gas boilers for domestic use, in particular for the production of hot water.



   As is well known to those skilled in the art, in these boilers, the hot water is heated by means of a heat exchanger.



   In the current state of the art, various types of suitable heat exchangers are already known.



   The most widely used heat exchanger is that which has a coil through which hot water flows, and which is
 EMI1.2
 nveloped --- eeeurement a heat exchanger of this type has the important drawback of not being easily accessible, so that the lime deposits remaining in the coil containing hot water, which is generally hard water, can not be removed if not by chemical means
 EMI1.3
 ques and, therefore, in a manner that is neither secure nor reviewable.



   Other conventional types of heat exchanger, such as the plate types or those which have several removable coils, eliminate the difficulty mentioned above but are however adversely affected by the necessary presence of gaskets which, in the event of do not prevent the transfer of liquids, i.e. mixing of hot water with water from the heating system. In addition, because they use more complicated techniques
 EMI1.4
 These manufacturing seals increase the cost of the device.



  The object of the present invention is expressly to eliminate the drawbacks mentioned above, by therefore providing a heat exchanger which allows easy access to the exchange surface. of heat exposes the hot water and which allows, therefore,

 <Desc / Clms Page number 2>

 
 EMI2.1
 t completely eliminate all lime deposits from this surface; which is simple, compact and therefore economical and which also ensures constant operating safety without the possibility of transferring fluids.



   This object is substantially achieved by a tube of suitable shape which, having a swelling twisted in a helix and obtained by hydraulic molding, determines respectively by means of an inner coaxial tube and an outer tube, also coaxial, the two helical flow paths used for the return of hot water from the heating system, which rises in the inner tube, and for the water to be heated.



   In this way, the heat exchanger as a whole is formed by three tubes simply interlocked coaxially with one another and forming a system which is compact and easy to disassemble and is therefore easy to access. In addition, any possibility of transferring fluids is prevented by a double waterproof O-ring, provided at each end of the heat exchanger. The economy of the System is evident due to the fact that the helical bulge of the main tube is obtained simply by hydraulic molding.



   The present invention will be clearly understood on reading the following description made in connection with the attached drawings, in which - Figure 1 shows a perspective view, partially cut away, of a heat exchanger produced according to the present invention; and - Figure 2 is a partially cutaway view, a different scale, of the three separate elements which form the heat exchanger.



   We will now refer to the figures. The reference numeral 1 designates a tube having a bulge twisted in a helix and obtained by hydraulic molding; this tube is introduced coaxially, so. to be placed between an inner tube 2 and an outer tube 3.



   This twisted tube has, at its base end 4, two O-rings 5 and 6 which constitute tight seals between the

 <Desc / Clms Page number 3>

 tube 1 and the outer tube 3, and a support tube 7 which is simply fixed by a flange on the end of the tube 3. The end of the twisted tube 1 ends, on the other hand, by a collar 8 which is firm hermeti - only, via watertight O-rings 10 and 11, by
 EMI3.1
 a press-fitting 9 - inner cap 12 formed at the upper end of the outer tube 3, also creates a hermetic seal between the tube 1 and the tube 3. Finally, the inner tube 2 ends at its base with a narrowing 13 in the form of a funnel, so that a chamber is created
 EMI3.2
 14 'water collector.



  In this way, between the three coaxial tubes 1, 2 and 3 are formed two helically shaped chambers, the inner chamber 14, located between the inner tube 2 and the twisted tube l, constitutes the return flow path, in the direction indicated by arrows 15, 11 hot water from the heating system introduced into the inner tube 2 in the direction indicated by arrow 16. The other chamber 17 in
 EMI3.3
 - st-si -contrentreetube and 1-e - outer tube 3, and is crossed by the water to be heated which is introduced cold into the room through the inlet 18 provided at the base of the tube shaped like heHee-exterior 3 and which is evacuated hot by the outlet 19 also provided at the end of the outer tube 3.

   The path followed by the hot water in the chamber 17 is indicated by the arrows 20 in FIG. 1.



   The present invention is not imitated in the examples of resalisation which have just been described, it is on the contrary susceptible of variants and modifications which will appear to those skilled in the art.


    

Claims (3)

REVENDICATIONS 1. Echangeur de chaleur, caractérisé en ce qu'il est formé d'un tube torsade (1) présentant un renflement en hélice qui est introduit EMI4.1 coaxialement de manière ä se trouver intercalé entre un tube extérieur (3) et un tube intérieur (2), le tube torsadé (l) étant fermé hermitquement ä son extremiste par un bouchon mise à l'air libre pourvu d'un double joint torique (10, 11), et étant dote son autre extremite, ou extreme base, de deux joints tonquesL5, 6) jr-op-Pirant pour former un joint étanche avec la surface intérieure du tube exterieur (3).  CLAIMS 1. Heat exchanger, characterized in that it is formed of a twisted tube (1) having a helical bulge which is introduced  EMI4.1  coaxially so as to be interposed between an outer tube (3) and an inner tube (2), the twisted tube (l) being hermitically closed at its extremity by a vented cap provided with a double O-ring (10, 11), and being provided at its other end, or extreme base, with two toned seals L5, 6) jr-op-Pirant to form a tight seal with the inner surface of the outer tube (3). 2. Echangeur de chaleur suivant la revendication 1, caractérisé en ce que le tube torsade présente un renflement en hélice obtenu par moulage hydraulique.  2. Heat exchanger according to claim 1, characterized in that the twisted tube has a helical bulge obtained by hydraulic molding. 3. Echangeur de chaleur suivant la revendication 1, caractérisé en ce que le tube intérieur se termine à son extrémité de base par un rétrécissement (13) en forme d'entonnoir.  3. Heat exchanger according to claim 1, characterized in that the inner tube ends at its base end by a narrowing (13) in the form of a funnel.
BE8700597A 1987-05-27 1987-05-27 Heat exchanger for domestic use - comprises three coaxial tubes sealed at ends by O=rings, with central tube being twisted and with helical swell BE1000721A4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BE8700597A BE1000721A4 (en) 1987-05-27 1987-05-27 Heat exchanger for domestic use - comprises three coaxial tubes sealed at ends by O=rings, with central tube being twisted and with helical swell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE8700597A BE1000721A4 (en) 1987-05-27 1987-05-27 Heat exchanger for domestic use - comprises three coaxial tubes sealed at ends by O=rings, with central tube being twisted and with helical swell

Publications (1)

Publication Number Publication Date
BE1000721A4 true BE1000721A4 (en) 1989-03-21

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BE8700597A BE1000721A4 (en) 1987-05-27 1987-05-27 Heat exchanger for domestic use - comprises three coaxial tubes sealed at ends by O=rings, with central tube being twisted and with helical swell

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE78022C (en) * 1900-01-01 G. HORN, Braunschweig Gas cooler with two nested, oppositely wound screw jacket surfaces
DE569027C (en) * 1933-01-27 Bergedorfer Eisenwerk Akt Ges Closed countercurrent cooler for milk and other liquids, which consists of three concentrically arranged coats
US2456775A (en) * 1944-11-16 1948-12-21 Arthur J Fausek Heat exchanger
DE815805C (en) * 1948-10-02 1951-10-04 Demag Elektrometallurgie Gmbh Cooling device
FR1169790A (en) * 1957-03-18 1959-01-06 Heat exchanger tubes
US4146088A (en) * 1976-04-08 1979-03-27 Pain Ronald A Heat exchanger

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE78022C (en) * 1900-01-01 G. HORN, Braunschweig Gas cooler with two nested, oppositely wound screw jacket surfaces
DE569027C (en) * 1933-01-27 Bergedorfer Eisenwerk Akt Ges Closed countercurrent cooler for milk and other liquids, which consists of three concentrically arranged coats
US2456775A (en) * 1944-11-16 1948-12-21 Arthur J Fausek Heat exchanger
DE815805C (en) * 1948-10-02 1951-10-04 Demag Elektrometallurgie Gmbh Cooling device
FR1169790A (en) * 1957-03-18 1959-01-06 Heat exchanger tubes
US4146088A (en) * 1976-04-08 1979-03-27 Pain Ronald A Heat exchanger

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