WO2009103869A2 - Heating pipe for conveying fluid - Google Patents

Heating pipe for conveying fluid Download PDF

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Publication number
WO2009103869A2
WO2009103869A2 PCT/FR2008/001706 FR2008001706W WO2009103869A2 WO 2009103869 A2 WO2009103869 A2 WO 2009103869A2 FR 2008001706 W FR2008001706 W FR 2008001706W WO 2009103869 A2 WO2009103869 A2 WO 2009103869A2
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WO
WIPO (PCT)
Prior art keywords
tube
heating
pipe
length
connector
Prior art date
Application number
PCT/FR2008/001706
Other languages
French (fr)
Other versions
WO2009103869A3 (en
Inventor
Didier Comtat
Rodolphe Emaille
Marc Novellani
Original Assignee
Mgi Coutier
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 Mgi Coutier filed Critical Mgi Coutier
Priority to DE112008003310T priority Critical patent/DE112008003310T5/en
Publication of WO2009103869A2 publication Critical patent/WO2009103869A2/en
Publication of WO2009103869A3 publication Critical patent/WO2009103869A3/en

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/54—Heating elements having the shape of rods or tubes flexible
    • H05B3/58—Heating hoses; Heating collars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
    • F16L25/01—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means specially adapted for realising electrical conduction between the two pipe ends of the joint or between parts thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
    • F16L53/30—Heating of pipes or pipe systems
    • F16L53/35—Ohmic-resistance heating
    • F16L53/38—Ohmic-resistance heating using elongate electric heating elements, e.g. wires or ribbons

Definitions

  • the present invention relates generally to the field of pipes for the transport of fluid, for example in motor vehicles where it is necessary to channel various gaseous or liquid fluids: air, fuel, oil, glass washing liquid, etc. More particularly, this invention is concerned with such a pipe equipped so as to heat or heat the transported fluid.
  • pipe designates an assembly constituted by a rigid or flexible tube of any length and shape, and by at least one fitting placed at one end of the tube, and making it possible to connect this tube to another part of the fluid circuit concerned, or to a device or apparatus inserted on this fluid circuit:
  • Fluid transport lines such as those mounted on motor vehicles, present a risk of clogging or at least restriction of their section, related to the icing phenomenon in case of cold. Clogging or restriction of section of a pipe obviously hinders the normal circulation and with sufficient flow of the fluid transported, and may result in a suppression or at least an alteration of the function performed by the fluid.
  • heating of the pipe is effectively obtained and fluid it contains, on its current length, but the ends of the pipe and in particular the connections placed at these ends are not heated. Cold spots or cold spots remain to be clogged with frost or to release only in a very slow manner, even if the tube of the pipe is heated.
  • the present invention aims to remedy these disadvantages, and therefore aims to provide a simpler and more economical solution for obtaining fully heated pipes, that is to say on their current length and also to level of their fitting (s).
  • the invention essentially relates to a heating pipe for the transport of fluid, the pipe being composed of a tube and at least one connector placed at one end of the tube, this heating pipe comprising, of a on the one hand, resistive electric heating means extending over the length of the tube and, on the other hand, supplied with energy by the same connection means as the preceding heating means, means for transfer by thermal conduction of a power heating to the area of the fittings.
  • the solution that is the subject of the invention makes it possible to eliminate any separate heating for the or each connection of the pipe, by bringing heating energy simultaneously to the pipe and the connection (s), starting from a single and same power connection.
  • the resistive electric heating means which extend over the length of the tube, these are advantageously constituted by at least one resistive electric wire, supplied by the connection means and placed between an inner constituent layer of the tube and an outer constituent layer of the tube.
  • the outer constituent layer (with respect to the resistive wire) of the tube is preferably made of a material with good thermal insulation qualities, in order to limit heat losses to the outside and thus limit the necessary heating time and the temperature. electrical energy consumed.
  • This outer constituent layer of the tube consists, for example of a vulcanized elastomeric thermoplastic (TPE) or not, for example a polypropylene terpolymer alloy (PP / EPDM) or a thermoplastic polyurethane (TPU).
  • TPE vulcanized elastomeric thermoplastic
  • PP / EPDM polypropylene terpolymer alloy
  • TPU thermoplastic polyurethane
  • This type of material has, in addition to its thermal insulation properties, other qualities such as abrasion resistance, impact resistance, fire resistance (in some cases), etc.
  • the inner constituent layer of the tube must be chosen in a material which is compatible with the nature and the temperature of the fluid transported, and which is also a good material conducts heat.
  • This is, for example, a polymer such as polyamide, compatible with the hot fuel transport, this in the case of application of the invention to a fuel line.
  • a metallic embodiment of the inner constituent layer is also conceivable, preferably with an electrically insulating coating.
  • the means for transferring a heating power to the zone of the connector or connectors comprises a sleeve made of material with good thermal conduction qualities, connecting an end zone of the tube inside the corresponding connector.
  • This sleeve is in particular a tubular metal part incorporated in the coupling and engaged in the corresponding end of the tube.
  • the aforementioned resistive electrical wire extending over the length of the tube, forms in the end zone of this tube several turns wrapped around a length section of the sleeve with good heat conduction qualities. These few heating turns, electrically powered together with the rest of the resistive wire, increase the heating power in the terminal zone of the tube, and allow to optimize the heating of the connection.
  • the uniqueness of the electrical connection, for the entire pipe (tube and connection) also facilitates the isolation of this connection and its protection vis-à-vis external aggressions, in particular by overmolding the connection.
  • Figure 1 is a side view, with partial sections, of a heating pipe according to the present invention
  • Figure 2 is a view similar to Figure 1, showing a variant of this heating pipe
  • Figure 3 is a view similar to the previous, illustrating another variant.
  • FIG. 1 shows a pipe, generally designated by the reference numeral 1, which consists of a tube 2 of a certain length, and a connector 3 placed at one end 2a of the tube 2. 'a heating pipe, it also includes, near the connection
  • an electrical connector 4 provided for an electrical power supply.
  • the electrical connector 4 is connected to the remainder of the pipe 1 by an overmolding 5 which coats the end zone 2a of the tube 2 equipped with the coupling 3.
  • the tube 2 has a multilayer structure, with at least one inner constituent layer 6, for example polyamide, compatible with the transported fluid, and an outer constituent layer 7, for example thermoplastic elastomer (TPE) or thermoplastic polyurethane (TPU), having good thermal insulation qualities.
  • inner constituent layer 6 for example polyamide
  • outer constituent layer 7 for example thermoplastic elastomer (TPE) or thermoplastic polyurethane (TPU), having good thermal insulation qualities.
  • TPE thermoplastic elastomer
  • TPU thermoplastic polyurethane
  • At least one resistive electric wire 8 which extends over the length of the tube 2 by describing for example a "round trip" path from the zone of end 2a of this tube 2 equipped with the connector 3.
  • the connector 3 has a metal part 9, in the form of a sleeve, which is engaged in the corresponding end of the tube 2.
  • the electrical connector 4 leads to the pipe 1 of the electrical energy from an external source, and it circulates in the resistive electrical wire 8 an electric current which causes a Joule effect heat release, over the entire length of the tube 2.
  • the outer constituent layer 7 of the tube 2 being thermally insulating, the heat generated is mainly directed towards the inside of this tube 2, thus towards the fluid flowing through the pipe 1
  • the metal sleeve 9 provides thermal conduction and thus heat transfer in an axial direction towards the inside of the connector 3.
  • the thermal conduction of the sleeve 9, combined to the insulating effect of the overmolding 5, avoids any "cold spot" at the connection 3.
  • the pipe 1, thus also the transported fluid, is thus heated (e) as well over the length of the tube 2 as in the particular region of fitting 3.
  • FIG. 2 in which the elements corresponding to those previously described are designated by the same reference numerals, illustrates a variant of this pipe 1 in which the heat transfer to the connection 3, from the end zone 2a of the tube 2, is further strengthened.
  • the resistive electrical wire 8 forms, in the end zone 2a of the tube 2, a few close turns 10, wound around a length portion of the metal sleeve 9.
  • These heating turns 10 increase the electric heating power in the end zone 2a of the tube 2, thus also the heat flux transferred through the sleeve 9 to the inside of the coupling 3.
  • FIG. 3 illustrates another variant of the pipe 1 according to the invention, in which the electrical connector (not shown) for supplying the resistive wire 8 is located at the end of the tube 2 remote from the coupling 3 to be heated.
  • the two strands respectively "go" and “return” of the resistive electric wire 8 can leave the tube 2 and be electrically connected by means of a short strip 11 realizing putting them in contact.
  • a metal sleeve 9 heated by the resistive wire 8 ensures the transfer of heat to the fitting 3.
  • An overmoulding 12 of suitable shape covers the end zone 2a of the tube 2 by coating the connecting strip 11, as well as part of the sleeve 9.
  • the invention avoids the risk of clogging or reduction of the useful section of the pipe 1, related to icing, in all of this channel 1, that is to say on the length of the tube 2 and also in the region of the connector 3.
  • the electrical supply of the resistive wire 8 through the connector 4 is slaved, in particular to a temperature sensor, the device also makes it possible to regulate the temperature of the fluid transported by the pipe 1 considered.
  • the invention is particularly applicable to the field of the automobile, the engine control means of the vehicle concerned triggering, below a certain temperature, the power supply of the electrical connection 4 which itself feeds the resistive wire 8.
  • the constituent layers of the tube in any appropriate materials, chosen as a function of the fluid transported (air, fuel, oil, water, washing liquid, etc.) and external stresses such as chemical and / or physical attacks to which is exposed the pipeline,
  • the inner constituent layer of the tube such as a corrugated pipe with a helical continuous coil receiving the resistive wire, which makes it possible to have a much greater heating length and a more homogeneous distribution of the heating, while increasing the flexibility of the tube,
  • the pipes may have any configuration: straight, bent, fork, etc.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pipe Accessories (AREA)
  • Resistance Heating (AREA)

Abstract

The pipe (1) is made up of a tube (2) and of at least one union (3) positioned at one end of the tube. It comprises resistive electric heating means (8) running the length of the tube (2), it being possible for these means to consist of a resistive wire embedded within the thickness of the tube. The pipe (1) further comprises, supplied with power by the same means (4) of connection as the aforesaid heating means (8), means (9) that use thermal conduction to transfer a heating power to the region of the union (3). These means of transfer preferably comprise a sleeve (9) with good thermal conductivity properties, connecting a terminal region (2a) of the tube (2) to the inside of the union (3). The invention applies to pipes for conveying various fluids, such as air, fuel, oil or washer fluid, in motor vehicles.

Description

Canalisation chauffante pour le transport de fluide Heating pipe for the transport of fluid
La présente invention concerne, de façon générale, le domaine des canalisations pour le transport de fluide, par exemple dans des véhicules automobiles où il convient de canaliser divers fluides gazeux ou liquides : air, carburant, huile, liquide de lavage pour vitre, etc. Plus particulièrement, cette invention s'intéresse à une telle canalisation équipée de manière à pouvoir chauffer ou réchauffer le fluide transporté.The present invention relates generally to the field of pipes for the transport of fluid, for example in motor vehicles where it is necessary to channel various gaseous or liquid fluids: air, fuel, oil, glass washing liquid, etc. More particularly, this invention is concerned with such a pipe equipped so as to heat or heat the transported fluid.
Dans le cadre de la présente invention, le terme « canalisation » désigne un ensemble constitué par un tube rigide ou flexible de longueur et de forme quelconques, et par au moins un raccord placé à une extrémité du tube, et permettant de connecter ce tube à une autre partie du circuit de fluide concerné, ou à un dispositif ou appareil inséré sur ce circuit de fluide:In the context of the present invention, the term "pipe" designates an assembly constituted by a rigid or flexible tube of any length and shape, and by at least one fitting placed at one end of the tube, and making it possible to connect this tube to another part of the fluid circuit concerned, or to a device or apparatus inserted on this fluid circuit:
Les canalisations de transport de fluide, telles que celles montées sur des véhicules automobiles, présentent un risque de colmatage ou du moins de restriction de leur section, lié au phénomène de givrage en cas de froid. Le colmatage ou la restriction de section d'une canalisation fait évidemment obstacle à la circulation normale et avec débit suffisant du fluide transporté, et peut avoir pour conséquence une suppression ou du moins une altération de la fonction réalisée par le fluide.Fluid transport lines, such as those mounted on motor vehicles, present a risk of clogging or at least restriction of their section, related to the icing phenomenon in case of cold. Clogging or restriction of section of a pipe obviously hinders the normal circulation and with sufficient flow of the fluid transported, and may result in a suppression or at least an alteration of the function performed by the fluid.
Pour éviter ce genre de difficulté, il a déjà été proposé des systèmes de chauffage électrique, qui réchauffent la partie tubulaire d'une canalisation de transport de fluide, ou qui réchauffent directement le fluide parcourant une telle canalisation. A titre d'exemples, il est fait ici référence aux brevets US 4063790 et US 4394057, qui prévoient des conducteurs électriques chauffants disposés sur la longueur courante de la canalisation, et aux documents de brevets WO 02/38426 et GB 2261160, qui prévoient un chauffage plus direct du fluide parcourant la canalisation.To avoid this kind of difficulty, it has already been proposed electric heating systems, which heat the tubular portion of a fluid transport pipe, or that directly heat the fluid flowing through such a pipe. By way of example, reference is made to US Pat. Nos. 4,066,790 and 4,391,057, which provide for electric heating conductors arranged along the length of the pipe, and to patent documents WO 02/38426 and GB 2261160, which provide for a more direct heating of the fluid passing through the pipe.
Dans le cas de dispositifs réalisant le chauffage du tube, par exemple au moyen de conducteurs électriques chauffants enroulés en hélice dans ou sur la paroi du tube (voir les brevets US 4063790 et US 4394057 précités), on obtient effectivement un chauffage de la canalisation et du fluide qu'elle renferme, sur sa longueur courante, mais les extrémités de la canalisation et en particulier les raccords placés à ces extrémités ne sont pas chauffés. Il subsiste ainsi des points froids ou des zones froides, qui risquent d'être obstrués par du givre ou de se libérer seulement d'une manière très lente, même si le tube de la canalisation est chauffé.In the case of devices carrying out the heating of the tube, for example by means of electric heating conductors helically wound in or on the wall of the tube (see the aforementioned US Pat. Nos. 4,066,790 and 4,391,057), heating of the pipe is effectively obtained and fluid it contains, on its current length, but the ends of the pipe and in particular the connections placed at these ends are not heated. Cold spots or cold spots remain to be clogged with frost or to release only in a very slow manner, even if the tube of the pipe is heated.
Pour résoudre ce problème, une idée de solution consiste à chauffer directement la totalité des canalisations de transport de fluide, c'est-à- dire aussi bien leur partie « tube » que leur(s) partie(s) terminales « raccord ». Cette idée a déjà été mise en œuvre, toutefois dans des réalisations qui comportent des dispositifs séparés de chauffage de la zone des raccords ou autres accessoires analogues. De tels dispositifs ont été notamment proposés pour des installations de lave-vitre de véhicules automobiles, en particulier pour le chauffage des gicleurs - voir par exemple les documents de brevets FR 2804395 A1 et DE 19902431 A1. Pour une autre application sur des véhicules automobiles (conduit d'additif à base d'urée), il est aussi fait référence ici au document WO 2007/073286 A1.To solve this problem, an idea of solution consists in directly heating all the fluid transport pipes, that is to say both their part "tube" and their (their) part (s) end "fitting". This idea has already been implemented, however in embodiments that include separate devices for heating the area of fittings or other similar accessories. Such devices have been proposed in particular for windshield washer installations of motor vehicles, in particular for heating sprinklers - see for example patent documents FR 2804395 A1 and DE 19902431 A1. For another application on motor vehicles (urea additive conduit), reference is also made here to WO 2007/073286 A1.
Toutefois, comme on le comprend aisément, le rajout de dispositifs chauffants spéciaux, sur ou dans les raccords d'une canalisation, complique et la fabrication et la rend plus coûteuse, notamment du point de vue de la réalisation des connexions électriques et aussi pour les opérations d'assemblage.However, as is easily understood, the addition of special heating devices, on or in the connections of a pipe, complicates and makes the manufacture more expensive, particularly from the point of view of the realization of electrical connections and also for the assembly operations.
La présente invention vise à remédier à ces derniers inconvénients, et elle a donc pour but de fournir une solution plus simple et plus économique pour l'obtention de canalisations rendues chauffantes entièrement, c'est-à-dire sur leur longueur courante et aussi au niveau de leur(s) raccord(s).The present invention aims to remedy these disadvantages, and therefore aims to provide a simpler and more economical solution for obtaining fully heated pipes, that is to say on their current length and also to level of their fitting (s).
A cet effet, l'invention a essentiellement pour objet une canalisation chauffante pour le transport de fluide, la canalisation étant composée d'un tube et d'au moins un raccord placé à une extrémité du tube, cette canalisation chauffante comprenant, d'une part, des moyens de chauffage électrique résistif s'étendant sur la longueur du tube et, d'autre part, alimentés en énergie par les mêmes moyens de connexion que les précédents moyens de chauffage, des moyens de transfert par conduction thermique d'une puissance de chauffe vers la zone du ou des raccords.For this purpose, the invention essentially relates to a heating pipe for the transport of fluid, the pipe being composed of a tube and at least one connector placed at one end of the tube, this heating pipe comprising, of a on the one hand, resistive electric heating means extending over the length of the tube and, on the other hand, supplied with energy by the same connection means as the preceding heating means, means for transfer by thermal conduction of a power heating to the area of the fittings.
Ainsi, la solution objet de l'invention permet de supprimer tout chauffage séparé pour le ou chaque raccord de la canalisation, en amenant de l'énergie de chauffage simultanément au tube et au(x) raccord(s), à partir d'une seule et même connexion d'alimentation. En ce qui concerne les moyens de chauffage électrique résistif, qui s'étendent sur la longueur du tube, ceux-ci sont avantageusement constitués par au moins un fil électrique résistif, alimenté par les moyens de connexion et placé entre une couche constitutive intérieure du tube et une couche constitutive extérieure du tube.Thus, the solution that is the subject of the invention makes it possible to eliminate any separate heating for the or each connection of the pipe, by bringing heating energy simultaneously to the pipe and the connection (s), starting from a single and same power connection. With regard to the resistive electric heating means, which extend over the length of the tube, these are advantageously constituted by at least one resistive electric wire, supplied by the connection means and placed between an inner constituent layer of the tube and an outer constituent layer of the tube.
La couche constitutive extérieure (par rapport au fil résistif) du tube est, de préférence, réalisée en un matériau à bonnes qualités d'isolation thermique, pour limiter les déperditions de chaleur vers l'extérieur et ainsi limiter le temps de chauffe nécessaire et l'énergie électrique consommée. Cette couche constitutive extérieure du tube est constituée, par exemple d'un thermoplastique élastomère (TPE) vulcanisé ou non, par exemple un alliage polypropylène terpolymère (PP/EPDM) ou un polyuréthane thermoplastique (TPU). Ce genre de matériau possède, en plus de ses propriétés d'isolation thermique, d'autres qualités telles que la résistance à l'abrasion, la résistance aux chocs, la tenue au feu (dans certains cas), etc.The outer constituent layer (with respect to the resistive wire) of the tube is preferably made of a material with good thermal insulation qualities, in order to limit heat losses to the outside and thus limit the necessary heating time and the temperature. electrical energy consumed. This outer constituent layer of the tube consists, for example of a vulcanized elastomeric thermoplastic (TPE) or not, for example a polypropylene terpolymer alloy (PP / EPDM) or a thermoplastic polyurethane (TPU). This type of material has, in addition to its thermal insulation properties, other qualities such as abrasion resistance, impact resistance, fire resistance (in some cases), etc.
La couche constitutive intérieure du tube doit être choisie en une matière qui soit compatible avec la nature et la température du fluide transporté, et qui soit aussi une matière bonne conductrice de la chaleur. Il s'agit, par exemple, d'un polymère tel que polyamide, compatible avec le transport de carburant chaud, ceci dans le cas d'application de l'invention à une canalisation pour carburant. Une réalisation métallique de la couche constitutive intérieure est aussi envisageable, de préférence avec un revêtement électriquement isolant.The inner constituent layer of the tube must be chosen in a material which is compatible with the nature and the temperature of the fluid transported, and which is also a good material conducts heat. This is, for example, a polymer such as polyamide, compatible with the hot fuel transport, this in the case of application of the invention to a fuel line. A metallic embodiment of the inner constituent layer is also conceivable, preferably with an electrically insulating coating.
De préférence, les moyens de transfert d'une puissance de chauffe à la zone du ou des raccords comprennent un manchon en matériau à bonnes qualités de conduction thermique, reliant une zone terminale du tube à l'intérieur du raccord correspondant. Ce manchon est notamment une partie métallique tubulaire incorporée au raccord et engagée dans l'extrémité correspondante du tube.Preferably, the means for transferring a heating power to the zone of the connector or connectors comprises a sleeve made of material with good thermal conduction qualities, connecting an end zone of the tube inside the corresponding connector. This sleeve is in particular a tubular metal part incorporated in the coupling and engaged in the corresponding end of the tube.
Avantageusement, le fil électrique résistif précité, s'étendant sur la longueur du tube, forme dans la zone d'extrémité de ce tube plusieurs spires enroulées autour d'un tronçon de longueur du manchon à bonnes qualités de conduction thermique. Ces quelques spires chauffantes, alimentées électriquement en même temps que le reste du fil résistif, augmentent la puissance de chauffe dans la zone terminale du tube, et permettent d'optimiser le chauffage du raccord. L'unicité de la connexion électrique, pour l'ensemble de la canalisation (tube et raccord), facilite par ailleurs l'isolation de cette connexion et sa protection vis-à-vis des agressions extérieures, notamment par un surmoulage de la connexion.Advantageously, the aforementioned resistive electrical wire, extending over the length of the tube, forms in the end zone of this tube several turns wrapped around a length section of the sleeve with good heat conduction qualities. These few heating turns, electrically powered together with the rest of the resistive wire, increase the heating power in the terminal zone of the tube, and allow to optimize the heating of the connection. The uniqueness of the electrical connection, for the entire pipe (tube and connection), also facilitates the isolation of this connection and its protection vis-à-vis external aggressions, in particular by overmolding the connection.
L'invention sera mieux comprise à l'aide de la description qui suit, en référence au dessin schématique annexé représentant, à titre d'exemples, quelques formes d'exécution de cette canalisation chauffante pour le transport de fluide :The invention will be better understood from the description which follows, with reference to the attached schematic drawing showing, by way of example, some embodiments of this heating pipe for the transport of fluid:
Figure 1 est une vue de côté, avec coupes partielles, d'une canalisation chauffante conforme à la présente invention ;Figure 1 is a side view, with partial sections, of a heating pipe according to the present invention;
Figure 2 est une vue similaire à la figure 1, représentant une variante de cette canalisation chauffante ;Figure 2 is a view similar to Figure 1, showing a variant of this heating pipe;
Figure 3 est une vue similaire aux précédentes, illustrant une autre variante.Figure 3 is a view similar to the previous, illustrating another variant.
La figure 1 montre une canalisation, désignée dans son ensemble par la référence numérique 1 , laquelle se compose d'un tube 2 d'une certaine longueur, et d'un raccord 3 placé à une extrémité 2a du tube 2. S'agissant d'une canalisation chauffante, celle-ci comporte aussi, à proximité du raccordFIG. 1 shows a pipe, generally designated by the reference numeral 1, which consists of a tube 2 of a certain length, and a connector 3 placed at one end 2a of the tube 2. 'a heating pipe, it also includes, near the connection
3, un connecteur électrique 4 prévu pour une alimentation en énergie électrique. Le connecteur électrique 4 est relié au restant de la canalisation 1 par un surmoulage 5 qui enrobe la zone d'extrémité 2a du tube 2 équipée du raccord 3.3, an electrical connector 4 provided for an electrical power supply. The electrical connector 4 is connected to the remainder of the pipe 1 by an overmolding 5 which coats the end zone 2a of the tube 2 equipped with the coupling 3.
Le tube 2 possède une structure multicouches, avec au moins une couche constitutive intérieure 6 par exemple en polyamide, compatible avec le fluide transporté, et une couche constitutive extérieure 7 par exemple en thermoplastique élastomère (TPE) ou en polyuréthane thermoplastique (TPU), possédant de bonnes qualités d'isolation thermique.The tube 2 has a multilayer structure, with at least one inner constituent layer 6, for example polyamide, compatible with the transported fluid, and an outer constituent layer 7, for example thermoplastic elastomer (TPE) or thermoplastic polyurethane (TPU), having good thermal insulation qualities.
Entre les deux couches constitutives 6 et 7 du tube 2 se trouve inséré au moins un fil électrique résistif 8, qui s'étend sur la longueur du tube 2 en décrivant par exemple un trajet « aller-retour » à partir de la zone d'extrémité 2a de ce tube 2 équipée du raccord 3. Les extrémités du fil électrique résistif 8 sortent du tube 2 dans cette zone 2a et sont raccordées au connecteur électrique 4.Between the two constituent layers 6 and 7 of the tube 2 is inserted at least one resistive electric wire 8, which extends over the length of the tube 2 by describing for example a "round trip" path from the zone of end 2a of this tube 2 equipped with the connector 3. The ends of the resistive electrical wire 8 out of the tube 2 in this zone 2a and are connected to the electrical connector 4.
Le raccord 3 possède une partie métallique 9, en forme de manchon qui est engagée dans l'extrémité correspondante du tube 2.The connector 3 has a metal part 9, in the form of a sleeve, which is engaged in the corresponding end of the tube 2.
En cours de fonctionnement, le connecteur électrique 4 amène à la canalisation 1 de l'énergie électrique en provenance d'une source extérieure, et il circule dans le fil électrique résistif 8 un courant électrique qui provoque un dégagement de chaleur par effet Joule, sur toute la longueur du tube 2. La couche constitutive extérieure 7 du tube 2 étant thermiquement isolante, la chaleur dégagée est principalement dirigée vers l'intérieur de ce tube 2, donc vers le fluide parcourant la canalisation 1. De plus, dans la zone d'extrémité 2a du tube 2, le manchon métallique 9 assure une conduction thermique et ainsi un transfert de chaleur, dans une direction axiale vers l'intérieur du raccord 3. La conduction thermique du manchon 9, combinée à l'effet d'isolation du surmoulage 5, évite tout « point froid » au niveau du raccord 3. La canalisation 1 , donc aussi le fluide transporté, est ainsi chauffé(e) aussi bien sur la longueur du tube 2 que dans la région particulière du raccord 3.During operation, the electrical connector 4 leads to the pipe 1 of the electrical energy from an external source, and it circulates in the resistive electrical wire 8 an electric current which causes a Joule effect heat release, over the entire length of the tube 2. The outer constituent layer 7 of the tube 2 being thermally insulating, the heat generated is mainly directed towards the inside of this tube 2, thus towards the fluid flowing through the pipe 1 In addition, in the end zone 2a of the tube 2, the metal sleeve 9 provides thermal conduction and thus heat transfer in an axial direction towards the inside of the connector 3. The thermal conduction of the sleeve 9, combined to the insulating effect of the overmolding 5, avoids any "cold spot" at the connection 3. The pipe 1, thus also the transported fluid, is thus heated (e) as well over the length of the tube 2 as in the particular region of fitting 3.
La figure 2, sur laquelle les éléments correspondant à ceux précédemment décrits sont désignés par les mêmes références numériques, illustre une variante de cette canalisation 1 dans laquelle le transfert de chaleur vers le raccord 3, depuis la zone d'extrémité 2a du tube 2, se trouve encore renforcé. A cet effet, le fil électrique résistif 8 forme, dans la zone d'extrémité 2a du tube 2, quelques spires 10 rapprochées, enroulées autour d'un tronçon de longueur du manchon métallique 9. Ces spires 10 chauffantes augmentent la puissance de chauffe électrique dans la zone d'extrémité 2a du tube 2, donc aussi le flux thermique transféré au travers du manchon 9 jusqu'à l'intérieur du raccord 3.FIG. 2, in which the elements corresponding to those previously described are designated by the same reference numerals, illustrates a variant of this pipe 1 in which the heat transfer to the connection 3, from the end zone 2a of the tube 2, is further strengthened. For this purpose, the resistive electrical wire 8 forms, in the end zone 2a of the tube 2, a few close turns 10, wound around a length portion of the metal sleeve 9. These heating turns 10 increase the electric heating power in the end zone 2a of the tube 2, thus also the heat flux transferred through the sleeve 9 to the inside of the coupling 3.
Les flux thermiques, en particulier ceux dirigés depuis le fil résistif 8 et ses éventuelles spires 10 vers l'intérieur du tube 2 et vers le raccord 3, sont figurés sur le dessin par des flèches. La figure 3 illustre une autre variante de la canalisation 1 selon l'invention, dans laquelle le connecteur électrique (non représenté) d'alimentation du fil résistif 8 se situe à l'extrémité du tube 2 éloignée du raccord 3 à chauffer. Dans ce cas, vers l'extrémité 2a équipée du raccord 3, les deux brins respectivement « aller » et « retour » du fil électrique résistif 8 peuvent sortir du tube 2 et être reliés électriquement à l'aide d'une courte bande 11 réalisant leur mise en contact. Ici encore, un manchon métallique 9 chauffé par le fil résistif 8 assure le transfert de chaleur vers le raccord 3. Un surmoulage 12 de forme adaptée recouvre la zone d'extrémité 2a du tube 2 en enrobant la bande de liaison 11 , ainsi qu'une partie du manchon 9. L'invention évite les risques de colmatage ou de réduction de la section utile de la canalisation 1 , liés au givrage, dans l'ensemble de cette canalisation 1 c'est-à-dire sur la longueur du tube 2 et aussi dans la région du raccord 3. Si l'alimentation électrique du fil résistif 8 par le connecteur 4 est asservie, en particulier à un capteur de température, le dispositif permet aussi de réguler la température du fluide transporté par la canalisation 1 considérée. L'invention est applicable notamment au domaine de l'automobile, les moyens de contrôle du moteur du véhicule concerné déclenchant, en dessous d'une certaine température, l'alimentation de la connexion électrique 4 qui elle-même alimente le fil résistif 8.The heat flows, in particular those directed from the resistive wire 8 and any turns 10 to the inside of the tube 2 and to the connector 3, are shown in the drawing by arrows. FIG. 3 illustrates another variant of the pipe 1 according to the invention, in which the electrical connector (not shown) for supplying the resistive wire 8 is located at the end of the tube 2 remote from the coupling 3 to be heated. In this case, towards the end 2a equipped with the connection 3, the two strands respectively "go" and "return" of the resistive electric wire 8 can leave the tube 2 and be electrically connected by means of a short strip 11 realizing putting them in contact. Here again, a metal sleeve 9 heated by the resistive wire 8 ensures the transfer of heat to the fitting 3. An overmoulding 12 of suitable shape covers the end zone 2a of the tube 2 by coating the connecting strip 11, as well as part of the sleeve 9. The invention avoids the risk of clogging or reduction of the useful section of the pipe 1, related to icing, in all of this channel 1, that is to say on the length of the tube 2 and also in the region of the connector 3. If the electrical supply of the resistive wire 8 through the connector 4 is slaved, in particular to a temperature sensor, the device also makes it possible to regulate the temperature of the fluid transported by the pipe 1 considered. The invention is particularly applicable to the field of the automobile, the engine control means of the vehicle concerned triggering, below a certain temperature, the power supply of the electrical connection 4 which itself feeds the resistive wire 8.
L'on ne s'éloignerait pas du cadre de l'invention, telle que définie dans les revendications annexées :One would not depart from the scope of the invention, as defined in the appended claims:
- en disposant le fil résistif suivant tout trajet, sur la longueur du tube,by arranging the resistive wire according to any path, over the length of the tube,
- en revêtant ce fil résistif d'un isolant électrique,by coating this resistive wire with an electrical insulator,
- en réalisant les couches constitutives du tube en tous matériaux appropriés, choisis en fonction du fluide transporté (air, carburant, huile, eau, liquide de lavage, ...) et des contraintes extérieures telles que les agressions chimiques et/ou physiques auxquelles est exposée la canalisation,by producing the constituent layers of the tube in any appropriate materials, chosen as a function of the fluid transported (air, fuel, oil, water, washing liquid, etc.) and external stresses such as chemical and / or physical attacks to which is exposed the pipeline,
- en conformant la couche constitutive intérieure du tube comme un tuyau annelé, à spire continue hélicoïdale recevant le fil résistif, ce qui permet de disposer d'une longueur de chauffe beaucoup plus importante, et d'une répartition plus homogène du chauffage, tout en augmentant la souplesse du tube,by conforming the inner constituent layer of the tube such as a corrugated pipe with a helical continuous coil receiving the resistive wire, which makes it possible to have a much greater heating length and a more homogeneous distribution of the heating, while increasing the flexibility of the tube,
- en multipliant autant de fois que nécessaire les dispositions propres à l'invention, pour l'application de celle-ci à des canalisations pourvues de deux, trois ou plusieurs raccords, les canalisations pouvant posséder toute configuration : rectiligne, coudée, en fourche, etc.,- multiplying as many times as necessary the provisions of the invention, for the application thereof to the pipes provided with two, three or more connections, the pipes may have any configuration: straight, bent, fork, etc.
- en prévoyant sur la canalisation tous éléments additionnels, par exemple en insérant dans le circuit électrique un élément de régulation du type « résistance à coefficient de température positif » (CTP), cet élément pouvant se situer soit sur le tube, soit sur le raccord. - by providing on the pipe all additional elements, for example by inserting into the electric circuit a regulation element of the type "resistance with positive temperature coefficient" (PTC), this element being able to be located on the tube or on the connection .

Claims

REVENDICATIONS
1. Canalisation chauffante pour le transport de fluide, la canalisation (1) étant composée d'un tube (2) et d'au moins un raccord (3) placé à une extrémité du tube (2), caractérisée en ce qu'elle comprend, d'une part, des moyens de chauffage électrique résistif (8) s'étendant sur la longueur du tube (2) et, d'autre part, alimentés en énergie par les mêmes moyens de connexion (4) que les précédents moyens de chauffage (8), des moyens de transfert (9 ; 10) par conduction thermique d'une puissance de chauffe vers la zone du ou des raccords (3).Heated conduit for the transport of fluid, the pipe (1) consisting of a tube (2) and at least one connector (3) placed at one end of the tube (2), characterized in that it comprises, on the one hand, resistive electrical heating means (8) extending over the length of the tube (2) and, on the other hand, supplied with energy by the same connection means (4) as the preceding means heating means (8), transfer means (9; 10) by thermal conduction of a heating power to the area of the connector (s) (3).
2. Canalisation chauffante selon la revendication 1 , caractérisée en ce que les moyens de chauffage électrique résistif, qui s'étendent sur la longueur du tube (2), sont constitués par au moins un fil électrique résistif (8), alimenté par les moyens de connexion (4) et placé entre une couche constitutive intérieure (6) du tube (2) et une couche constitutive extérieure (7) du tube (2).2. Heating duct according to claim 1, characterized in that the resistive electric heating means, which extend over the length of the tube (2), are constituted by at least one resistive electric wire (8), powered by the means connection (4) and placed between an inner constituent layer (6) of the tube (2) and an outer constituent layer (7) of the tube (2).
3. Canalisation chauffante selon la revendication 2, caractérisée en ce que la couche constitutive extérieure (7) du tube (2) est réalisée en un matériau à bonnes qualités d'isolation thermique.3. Heating pipe according to claim 2, characterized in that the outer constituent layer (7) of the tube (2) is made of a material with good thermal insulation qualities.
4. Canalisation chauffante selon la revendication 3, caractérisée en ce que la couche constitutive extérieure (7) du tube (2) est constituée d'un thermoplastique élastomère (TPE) ou d'un polyuréthane thermoplastique (TPU).4. Heating pipe according to claim 3, characterized in that the outer constituent layer (7) of the tube (2) consists of an elastomeric thermoplastic (TPE) or a thermoplastic polyurethane (TPU).
5. Canalisation chauffante selon l'une quelconque des revendications 1 à 4, caractérisée en ce que les moyens de transfert d'une puissance de chauffe à la zone du ou des raccords (3) comprennent un manchon (9) à bonnes qualités de conduction thermique reliant une zone terminale (2a) du tube (2) avec l'intérieur du raccord (3) correspondant.5. Heating duct according to any one of claims 1 to 4, characterized in that the means for transferring a heating power to the zone or fittings (3) comprise a sleeve (9) with good qualities heat conduction connecting an end zone (2a) of the tube (2) with the interior of the fitting (3) corresponding.
6. Canalisation chauffante selon la revendication 5, caractérisée en ce que le manchon est une partie métallique tubulaire (9) incorporée au raccord (3) et engagée dans l'extrémité correspondante (2a) du tube (2).6. Heating pipe according to claim 5, characterized in that the sleeve is a tubular metal part (9) incorporated in the connector (3) and engaged in the corresponding end (2a) of the tube (2).
7. Canalisation chauffante selon l'ensemble des revendications 2 et 5, caractérisée en ce que le fil électrique résistif (8) précité, s'étendant sur la longueur du tube (2), forme dans la zone d'extrémité (2a) de ce tube (2) plusieurs spires (10) enroulées autour d'un tronçon de longueur du manchon (9) à bonnes qualités de conduction thermique.7. Heating duct according to Claims 2 and 5, characterized in that the abovementioned resistive electric wire (8), extending over the length of the tube (2), forms in the end zone (2a) of this tube (2) several turns (10) wound around a length portion of the sleeve (9) with good thermal conduction qualities.
8. Canalisation chauffante selon l'une quelconque des revendications 1 à 7, caractérisée en ce qu'elle comporte un connecteur électrique (4) relié au restant de la canalisation (1) par un surmoulage (5) qui enrobe la zone d'extrémité (2a) du tube (2) équipée du raccord (3). 8. Heating duct according to any one of claims 1 to 7, characterized in that it comprises an electrical connector (4) connected to the remainder of the pipe (1) by an overmoulding (5) which surrounds the end zone (2a) of the tube (2) equipped with the coupling (3).
PCT/FR2008/001706 2007-12-11 2008-12-08 Heating pipe for conveying fluid WO2009103869A2 (en)

Priority Applications (1)

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DE112008003310T DE112008003310T5 (en) 2007-12-11 2008-12-08 Heating pipe for the transport of fluid

Applications Claiming Priority (2)

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FR07.08626 2007-12-11
FR0708626A FR2924786A1 (en) 2007-12-11 2007-12-11 Fluid e.g. oil, transporting heating conduit for motor vehicle, has electrical connector provided near coupling fitting for supplying electrical energy, and transferring unit to transfer heating power towards coupling fitting zone

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WO2009103869A2 true WO2009103869A2 (en) 2009-08-27
WO2009103869A3 WO2009103869A3 (en) 2009-11-12

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CN104048136A (en) * 2014-06-18 2014-09-17 中海阳能源集团股份有限公司 Heating unit of oil transporting pipeline, oil transporting heating pipeline and transporting heating method
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US10859188B2 (en) 2009-01-15 2020-12-08 Globalmed, Inc. Stretch hose and hose production method
US10584811B2 (en) 2009-12-30 2020-03-10 Carl J Garrett Tapered helically reinforced hose and its manufacture
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DE112008003310T5 (en) 2010-11-04
FR2924786A1 (en) 2009-06-12

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