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Dokumentenidentifikation EP1086350 08.05.2003
EP-Veröffentlichungsnummer 1086350
Titel ROHRLEITUNG UND MITTEL ZUR VERGRÖSSERUNG DEREN FLÄCHE ZUR KÜHLUNG, KRAFTSTOFFLEITUNG UND DEREN HERSTELLUNGSVERFAHREN
Anmelder Norsk Hydro A/S, Oslo/Osló, NO
Erfinder VON HUTH SMITH, Ulf, DK-6200 Aabenraa, DK;
JOHNSEN, Peter, DK-6270 Tönder, DK;
BOYSEN, Karl, DK-6000 Kolding, DK;
KÖHLING, N., Peter, DK-6230 Rödekro, DK
Vertreter derzeit kein Vertreter bestellt
DE-Aktenzeichen 69906522
Vertragsstaaten DE, ES, FR, GB, IT, SE
Sprache des Dokument EN
EP-Anmeldetag 07.06.1999
EP-Aktenzeichen 999571938
WO-Anmeldetag 07.06.1999
PCT-Aktenzeichen PCT/DK99/00300
WO-Veröffentlichungsnummer 0099067590
WO-Veröffentlichungsdatum 29.12.1999
EP-Offenlegungsdatum 28.03.2001
EP date of grant 02.04.2003
Veröffentlichungstag im Patentblatt 08.05.2003
IPC-Hauptklasse F28F 1/42
IPC-Nebenklasse F02M 31/20   

Beschreibung[en]

The present invention relates to a flow conduit comprising a tubular element for conveying a liquid therein, said tubular element having an outer surface, an upper portion of said outer surface having a planar or a convex shape; cooling blades connected to and extending outward from said outer surface of said tubular element, each of said cooling blades having a base section and an outer section.

The fuel system in a vehicle serves to supply fuel to the motor from the tank installation of that vehicle. The fuel is pumped into an advance conduit leading to the motor. The fuel which is not consumed in the motor is extremely hot and is pumped back into the tank via a return conduit.

WO 94/23257 discloses a heat exchanger that has among its objects to cool fuel in the fuel system of a vehicle, wherein the cooler has been inserted between two conduits in the return conduit. However, this cooler is very space-intensive, and in that cooler a very large loss of pressure occurs in the return conduit which means that a large pumping capacity is required to return the amount of fuel in the return conduit to the tank.

EP-0 807 756 teaches a fuel system for a vehicle wherein a tubular section is inserted that has axially oriented cooling ribs for cooling the fuel in the advance and return conduits in the fuel system. At each of its ends, this tubular section is connected by means of tubes to the motor and tank installations, respectively. The tubular section comprises two parallel flow conduits and is provided with cooling ribs that allow the fuel to be cooled in a simple manner by the streams of air underneath the bottom of the vehicle.

The fuel system according to EP-0 807 756 eliminates the drawbacks in connection with pressure drops and large pumping capacity, and usual tubing underneath the bottom is also utilised which saves space compared to previously. However, dirt may accumulate on this cooling profile that may deposit on top of and between the cooling ribs and thus reduce the cooling effect or even have an insulating effect on the profile tubing. Moreover, this known type of fuel pipe comprises mechanical joints, eg soldered joints between eg fuel tubing, connector tubing and cooler tubing. Such joints present a risk of leak. This risk is greatly increased when the fuel is to be advanced in the fuel pipe under pressure. It is therefore desirable to be able to manufacture a fuel system with a minimum of joints, especially welded joints and soldered joints, in order to hereby reduce the risk of leaks occurring due to a weak joint.

In case of motors based on recently developed technology, a marked increase in the pressure and temperature of the fuel may occur. The temperature may become extremely elevated which gives rise to problems in connection with fuel tanks made of plastics and/or components in connection therewith, and likewise the fuel, eg the diesel oil, may react chemically with the plastics parts of the tank whereby the tank as well as the fuel can suffer damage. Moreover the fuel can also suffer damage eg as a consequence of boiling at the elevated temperatures. In the light of this it is, in connection with such novel motor installations, of the utmost importance to cool the fuel effectively, and many producers thus require that the temperature of the fuel must be kept below a suitably low temperature.

In the light of this it is the object of the invention to provide a flow conduit that remedies the above-mentioned drawbacks, and whereby the stipulated requirements to cooling can be complied with.

The invention consists of a flow conduit of the kind described above wherein each of said cooling blades is bent downwards at said base section with respect to said tubular element; and in that each tubular element further comprises cooling fins on said outer section of each of said cooling blades, wherein each of said cooling fins is connected to one of said cooling blades at a point of attachment and has a downwardly inclined cooling surface with respect to said point of attachment.

With a flow conduit according to the invention for cooling fuel, adequate cooling of the fuel is obtained in all conditions. The particular configurations of the flow conduit and the surface-enlarging means prevent accumulation of dirt in the spaces between the cooling blades, or on the upwardly facing surface part of the profile, since dirt, if any, will drop out of the spaces and the upwardly facing surface portion by itself. The surface-enlarging means on the flow conduit are thus self-cleaning.

The flow conduit according to the invention is in one embodiment an extruded aluminum profile. Aluminum is extremely heat-conductive and easily deformable which means that the profile according to this embodiment is uncomplicated to manufacture by extrusion and, the material thus chosen also yields an adequate cooling effect. In one embodiment of the flow conduit, it is made with internal cooling fins. Hereby a further cooling of the flow medium in the conduit is obtained.

In the following the invention will be described in further detail with reference to the accompanying drawings, wherein

  • Figure 1 schematically illustrates a fuel system with a profile for cooling fuel in accordance with the invention;
  • Figure 2 is a cross sectional view of a profile according to a preferred embodiment of the invention;
  • Figure 3 is a cross sectional view of a shaped profile for use as fuel pipe according to the invention;
  • Figure 4 is a schematical view of the bottom of a vehicle with a fuel pipe according to the invention; and
  • Figure 5 is a schematical view of a fuel pipe according to the invention.

Figure 1 shows the fuel system between a tank 1 and a motor 2. In an advance conduit 3 the fuel flows from the tank 1 and onwards to the motor 2. Excessive fuel is conveyed back to the tank 1 via a return flow 4. In case of a diesel-driven motor 2 a part of the fuel is used for lubrication of eg pumps in the motor 2, and therefore the amount of fuel conveyed to the motor 2 exceeds the amount combusted. In a diesel motor the fuel can thus be circulated in an amount of about thrice the tank volume.

The fuel is heated by passage through the motor installation 2, and accordingly it is necessary to cool the fuel in the return conduit 4. The return flow 4 is therefore provided with a fuel pipe according to the invention for cooling the fuel flowing therethrough to ensure that the fuel will neither, due to too elevated temperature, destroy the tank nor, due to chemical reacation with material in connection with the tank, will the combustibility of the fuel be reduced, eg by boiling, but is kept cooled to a harmless suitably low temperature. This fuel pipe is configured in a cooling profile 5 as shown in the cross sectional views of Figures 2 through 4.

Figure 2 illustrates the preferred embodiment of a profile 5 for cooling fuel in accordance with the invention. The profile 5 is an extruded aluminium profile that exhibits a centrally arranged tubular element 6 in which a flow conduit 11 is configured. The profile 5 is configured with two cooling blades 7 that extend diametrically from the tubular element 6. Each cooling blade 7 exhibits a bendable base section 8 and an outer section 9 that comprises a number of cooling fins 10.

In a preferred embodiment the flow conduit 11 in the tubular element 6 is provided with internal cooling ribs 17 whereby the cooling effect of the aluminium profile can be further increased.

As shown in Figure 3, the cooling blades 7 can be bent in the base section 8 whereby the cooling fins 10 in the outer section 9 feature downwardly inclined surfaces 12. Hereby dirt will slide off the cooling fins 10 that thus continue to have a cooling effect. Angulation of the cooling blades 7 means that the cooling profile 5 according to the invention will appear as compact and it will retain a high cooling surface. It being also substantially self-cleaning, the profile 5 according to the invention is suitable for use as a fuel pipe. Figure 4 shows how the profile 5 can be mounted underneath the bottom 13 of a vehicle.

It has been found in connection with the invention that the cooling fins 10 can alternatively or as supplement also be configured in the bendable section 8.

Figure 5 shows a fuel pipe 4 configured in a cooling profile 5 according to the invention. The pipe 4 is configured with a number of sections 14,15,16 wherein the cooling blades have been removed. Thus in the sections 14, the tubular element is thus essentially exposed whereby angulation of the tubular element is considerably facilitated, in particular in the light of the angulations often having different orientations since the configuration of the fuel pipe is a spatial shape.

Also, the cooling blades 7 can be removed by cutting-off or the like in one or more sections 15 in order to create space for fittings (not shown) . At each of the end sections 16 of the cooling profile 4, the cooling blades 7 have also been removed which means that in the tubular portion 6 a connecting branch can be configured that matches the reception opening in tank and motor installations 1,2, respectively.

It has further been found in connection with the invention that within the tubular element two or more flow conduits 11 can be extruded in the right circumstances.

In a not shown embodiment the flow conduit is built by means of two units in that a cooling element with cooling fins and/or cooling ribs have been attached to surface portions of a tubular element. In that case, the cooling element is preferably attached to surface portions that face sideways or downwards, and the cooling fins extend outwards or downwards relative to the tubular portion. A flow conduit having this configuration is suitable for mounting underneath the bottom of a vehicle, since it is possible to arrange the cooling element(s) according to desire on those areas of the tube that are not bent and where there are no fittings or the like for securing the pipe. The cooling element can eg be soldered or attached by deformation to the pipe in order to hereby provide adequate heat conductivity between the tubular element and the cooling element.


Anspruch[de]
  1. Rohrleitung umfassend:
    • ein Hohlelement (5) zum Befördern einer Flüssigkeit darin, wobei das Hohlelement (5) eine äußere Oberfläche hat, wobei ein oberer Bereich der äußeren Oberfläche eine flache oder eine konvexe Form hat;
    • Kühlflügel (8), die mit dem Hohlelement verbunden sind und sich von der äußeren Oberfläche des Hohlelements nach außen erstrecken, wobei jeder der Kühlflügel (8) einen Grundabschnitt und einen äußeren Abschnitt aufweist, dadurch gekennzeichnet, dass jeder der Kühlflügel (8) am Grundabschnitt mit Bezug auf das Hohlelement (5) nach unten gebogen ist; und wobei jedes Hohlelement weiterhin umfasst
    • Kühlrippen (7, 9, 10) auf dem äußeren Abschnitt auf jedem der Kühlflügel (8), wobei jede der Kühlrippen (7, 9, 10) mit einem der Kühlflügel (8) an einem Befestigungspunkt verbunden ist und mit Bezug auf den Befestigungspunkt eine nach unten geneigte Kühloberfläche aufweist.
  2. Rohrleitung nach Anspruch 1, wobei die Kühlflügel (8) zwei Kühlflügel umfassen, die auf gegenüberliegenden Seiten der äußeren Oberfläche mit dem Hohlelement (5) verbunden sind.
  3. Rohrleitung nach Anspruch 1, wobei die Kühloberfläche jeder der Kühlrippen (7, 9, 10) so geneigt ist, dass sie sich von dem Hohlelement (5) weg erstreckt.
  4. Rohrleitung nach Anspruch 1, wobei das Hohlelement (5), die Kühlflügel (8) und die Kühlrippen (7, 9, 10) vollständig miteinander verbunden und aus extrudiertem Aluminium gebildet sind.
  5. Rohrleitung nach Anspruch 1, wobei das Hohlelement (5) mindestens einen darin gebildeten Durchfluss aufweist, wobei jeder des mindestens einen Durchflusses Kühlrippen (17) aufweist, die auf einer Innenfläche des Durchflusses ausgebildet sind.
  6. Rohrleitung nach Anspruch 1, wobei das Hohlelement (5) und die Kühlflügel (8) nicht vollständig miteinander verbunden sind, wobei jeder der Kühlflügel (8) an die äußere Oberfläche des Hohlelements (5) anstößt.
  7. Fahrzeug-Kraftstoffsystem umfassend:
    • einen Kraftstofftank;
    • einen Fahrzeugmotor und
    • ein Hohlelement (5), das an dem Tank und dem Motor angeschlossen ist, um Kraftstoff zwischen dem Tank und dem Motor zu befördern, wobei das Hohlelement nach einem der Ansprüche 1 bis 6 ausgebildet ist.
  8. Kraftstoffsystem nach Anspruch 7, wobei mindestens einer der Endbereiche des Hohlelements (5) keine Kühlflügel (8) aufweist und Verbindungsteile beinhaltet, die das Hohlelement (5) mit mindestens dem Motor oder dem Tank verbinden.
  9. Kraftstoffsystem nach Anspruch 7, wobei das Hohlelement (5) ein Kraftstoff-Rücklaufrohr zum Befördern von Kraftstoff vom Motor zum Tank umfasst.
  10. Verfahren zur Herstellung des Kraftstoffsystems nach Anspruch 2, umfassend:
    • Extrudieren des Hohlelements (5), der Kühlflügel und der Kühlrippen als eine einzige, vollständige Einheit; und
    • Biegen des Hohlelements (5) an dem mindestens einen Biegungsbereich, um das Hohlelement so zu biegen, dass es zwischen den Motor und den Tank passt.
  11. Verfahren nach Anspruch 10, weiterhin umfassend:
    • Einkerben der Kühlflügel (8), um mindestens einen Abschnitt der Kühlflügel (8) zu entfernen, um so mindestens einen Biegungsbereich zu bilden.
  12. Verfahren nach Anspruch 10, weiterhin umfassend:
    • Biegen, nach unten, der jeweiligen Kühlflügel (8) im Biegungsbereich, und zwar so, dass jede Kühloberfläche jeder der Kühlrippen (7, 9, 10) mit Bezug auf den Befestigungspunkt nach unten geneigt ist.
Anspruch[en]
  1. A flow conduit comprising
    • a tubular element (5) for conveying a liquid therein, said tubular element (5) having an outer surface, an upper portion of said outer surface having a planar or a convex shape;
    • cooling blades (8) connected to and extending outward from said outer surface of said tubular element, each of said cooling blades (8) having a base section and an outer section, characterized in that each of said cooling blades (8) is bent downwards at said base section with respect to said tubular element (5); and in that each tubular element further comprises
    • cooling fins (7, 9, 10) on said outer section of each of said cooling blades (8), wherein each of said cooling fins (7, 9, 10) is connected to one of said cooling blades (8) at a point of attachment and has a downwardly inclined cooling surface with respect to said point of attachment.
  2. The flow conduit of claim 1, wherein said cooling blades (8) comprise two cooling blades connected to said tubular element (5) at diametrically opposed sides of said outer surface.
  3. The flow conduit of claim 1, wherein said cooling surface of each of said cooling fins (7, 9, 10) is inclined away from said tubular element (5).
  4. The flow conduit of claim 1, wherein said tubular element (5), said cooling blades (8), and said cooling fins (7, 9, 10) are integrally connected and are formed of extruded aluminium.
  5. The flow conduit of claim 1, wherein said tubular element (5) has at least one flow passage formed therein, each of said at least one flow passage having cooling ribs (17) formed on an inner surface thereof.
  6. The flow conduit of claim 1, wherein said tubular element (5) and said cooling blades (8) are not integrally connected, each of said cooling blades (8) abutting against said outer surface of said tubular element (5).
  7. A vehicle fuel system comprising:
    • a fuel tank;
    • a vehicle motor and
    • a tubular element (5) connecting to said tank and said motor for conveying fuel between said tank and said motor, wherein said tubular element is according to any one of the claims 1-6.
  8. The fuel system of claim 7, wherein at least one of the end portions of said tubular element (5) is free of any cooling blades (8) and includes a coupling member connecting said tubular element (5) to at least one of said motor and said tank.
  9. The fuel system of claim 7, wherein said tubular element (5) comprises a fuel return pipe for conveying fuel from said motor to said tank.
  10. A method of manufacturing the fuel system of claim 2, comprising
    • extruding said tubular element (5), said cooling blades, and said cooling fins as a single, integral unit; and
    • bending said tubular element (5) at said at least one bend area so as to shape said tubular element to fit between said motor and said tank.
  11. The method of claim 10, further comprising :
    • notching said cooling blades (8) to remove at least one section of said cooling blades (8) so as to form said at least one bend area.
  12. The method of claim 10, further comprising :
    • bending each of said cooling blades (8) downwardly at said bending section such that each cooling surface of each of said cooling fins (7, 9, 10) is downwardly inclined with respect to said point of attachment.
Anspruch[fr]
  1. Conduite d'écoulement comprenant :
    • un élément tubulaire (5) destiné à y conduire un liquide, ledit élément tubulaire (5) comportant une surface extérieure, une partie supérieure de ladite surface extérieure présentant une forme planaire ou convexe ;
    • des lames de refroidissement (8) reliées à ladite surface extérieure de l'élément tubulaire de laquelle elles s'étendent vers l'extérieur, chacune desdites lames de refroidissement (8) ayant une partie de base et une partie externe, caractérisée en ce que chacune des lames de refroidissement (8) est cintrée vers le bas dans la partie de base par rapport audit élément tubulaire (5) ; et en ce que chaque élément tubulaire comprend en outre,
    • sur la partie externe de chacune des lames de refroidissement (8), des ailettes de refroidissement (7, 9, 10), chacune desdites ailettes de refroidissement (7, 9, 10) étant reliée par un point d'attache à l'une des lames de refroidissement (8) et présentant une surface de refroidissement inclinée vers le bas par rapport audit point d'attache.
  2. Conduite d'écoulement selon la revendication 1, caractérisée en ce que les lames de refroidissement (8) comprennent deux lames de refroidissement reliées à l'élément tubulaire (5) à des côtés diamétralement opposés de ladite surface extérieure.
  3. Conduite d'écoulement selon la revendication 1, caractérisée en ce que la surface de refroidissement de chacune des ailettes de refroidissement (7, 9, 10) est inclinée de manière à s'écarter de l'élément tubulaire (5).
  4. Conduite d'écoulement selon la revendication 1, caractérisée en ce que l'élément tubulaire (5), les lames de refroidissement (8) et les ailettes de refroidissement (7, 9, 10) sont solidaires et réalisées en aluminium extrudé.
  5. Conduite d'écoulement selon la revendication 1, caractérisée en ce qu'un passage d'écoulement au moins est formé dans l'élément tubulaire (5), chacun des au moins un passages d'écoulement comportant des nervures de refroidissement (17) formées sur une surface intérieure dudit passage.
  6. Conduite d'écoulement selon la revendication 1, caractérisée en ce que l'élément tubulaire (5) et les lames de refroidissement (8) ne sont pas solidaires, chacune des lames de refroidissement (8) venant en appui contre la surface extérieure dudit élément tubulaire (5).
  7. Système carburant pour véhicule comprenant :
    • un réservoir ;
    • un moteur d'un véhicule et
    • un élément tubulaire (5) relié au réservoir et au moteur pour véhiculer le carburant entre le réservoir et le moteur, ledit élément tubulaire présentant les caractéristiques de l'une quelconque des revendications 1 - 6.
  8. Système carburant selon la revendication 7, caractérisé en ce qu'une au moins des parties d'extrémité de l'élément tubulaire (5) est dépourvue de lames de refroidissement (8) et comporte un élément de couplage reliant l'élément tubulaire (5) à l'un au moins des deux organes moteur et réservoir.
  9. Système carburant selon la revendication 7, caractérisé en ce que l'élément tubulaire (5) comprend un tuyau de retour de carburant destiné à recirculer le carburant du moteur vers le réservoir.
  10. Procédé de fabrication du système carburant selon la revendication 2, comprenant les étapes suivantes :
    • extruder l'élément tubulaire (5), les lames de refroidissement et les ailettes de refroidissement de manière à ce qu'ils forment une seule pièce ; et
    • cintrer l'élément tubulaire (5) dans au moins une zone de cintrage de manière à donner à l'élément tubulaire une forme lui permettant d'être intégré entre le moteur et le réservoir.
  11. Procédé selon la revendication 10, comprenant en outre l'étape consistant à

    entailler les lames de refroidissement (8) dans le but d'enlever une partie au moins desdites lames de refroidissement (8) de manière à former l'au moins une zone de cintrage.
  12. Procédé selon la revendication 10, comprenant en outre l'étape consistant à

    cintrer chacune des lames de refroidissement (8) vers le bas dans chaque zone de cintrage de manière à ce que chaque surface de refroidissement de chacune des ailettes de refroidissement (7, 9, 10) soit inclinée vers le bas par rapport à son point d'attache.






IPC
A Täglicher Lebensbedarf
B Arbeitsverfahren; Transportieren
C Chemie; Hüttenwesen
D Textilien; Papier
E Bauwesen; Erdbohren; Bergbau
F Maschinenbau; Beleuchtung; Heizung; Waffen; Sprengen
G Physik
H Elektrotechnik

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