EP1470355A1 - Pipe for transporting automobile fluids, comprising a smooth inner tube and an outer annellated tube - Google Patents

Pipe for transporting automobile fluids, comprising a smooth inner tube and an outer annellated tube

Info

Publication number
EP1470355A1
EP1470355A1 EP20030712276 EP03712276A EP1470355A1 EP 1470355 A1 EP1470355 A1 EP 1470355A1 EP 20030712276 EP20030712276 EP 20030712276 EP 03712276 A EP03712276 A EP 03712276A EP 1470355 A1 EP1470355 A1 EP 1470355A1
Authority
EP
European Patent Office
Prior art keywords
tube
inner tube
pipe
annellated
smooth inner
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.)
Ceased
Application number
EP20030712276
Other languages
German (de)
French (fr)
Inventor
Cyrielle Cheng
Pierre Milhas
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.)
Nobel Plastiques SA
Original Assignee
Nobel Plastiques SA
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 Nobel Plastiques SA filed Critical Nobel Plastiques SA
Publication of EP1470355A1 publication Critical patent/EP1470355A1/en
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/11—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall

Definitions

  • Automotive fluid transport hose comprising a smooth inner tube and a corrugated outer tube
  • the present invention relates to a pipe for transporting automotive fluids such as coolant, fuel, windshield washer fluid, etc.
  • a pipe for transporting automotive fluids comprising a smooth inner tube based on an elastomeric thermoplastic material, an outer corrugated tube which is in contact with the inner tube through the inner top of its waves and which is made of a thermoplastic material based on polyamide, and means for connecting the outer tube to the inner tube.
  • the pipe thus obtained is particularly well suited to the transport of automotive fluids and has a good ability to be shaped, in particular by elastic deformation.
  • This pipe is also simple and inexpensive to produce.
  • the elastomeric thermoplastic material used for the inner tube also allows easy creation of resistant connections with 'the organs to which the hose is connected, for example by means of nipples integral with the bodies and force-fitted in the inner tube.
  • the tubes are monolayers
  • the polyamide used is a poly- amide 12
  • the thermoplastic elastomer is a mixture of a polypropylene and an elastomer based on an ethylene propylene diene monomer.
  • This embodiment has very good characteristics for the transport of automotive fluids.
  • the pipe of the invention comprises an inner tube, generally designated at 1, and an outer tube, generally designated at 2, surrounding the inner tube 1.
  • the inner tube 1 is a smooth tube here having a single-layer structure of an elastomeric thermoplastic material.
  • the elastomeric thermoplastic material used is a mixture of a polypropylene and a rubber based on an ethylene propylene diene monomer (EPDM) such as one of those produced under the reference SANTOPRENE by the company ADVANCED ELASTOMER SYSTEMS.
  • EPDM ethylene propylene diene monomer
  • the outer tube 2 is a corrugated tube forming waves having an inner vertex 3 of inner diameter equal to or very substantially close to the outer diameter of the inner tube 1.
  • the tubes 1 and 2 are connected either at each vertex 3 by gluing or by adhesion for example during a coextrusion process either, if the pipe is of determined length, at the location of its ends by simple mechanical stop of the tube ex- térieur 2 against a flange of the inner tube 1 with or without bonding the ends of the tubes 1 and 2 to each other.
  • materials are chosen which are capable of adhering or of being bonded to each other.
  • the outer tube 2 here has a monolayer structure of polyamide and preferably of polyamide 12.
  • the materials used can be recycled materials originating, for example, from the grinding of scrap tubes, which causes less pollution and generates economic gain.
  • the pipe is obtained here by means of a known machine which comprises an extrusion head making it possible to produce, through a first channel, a parison which is pressed under the effect of an external suction against articulated molds surrounding the head of extrusion and moving parallel to the axis thereof.
  • a second extrusion channel allows, downstream of the parison extrusion, to fill the corrugated tube formed by the parison inside the molds with an internal smooth tube, which makes it possible to produce the pipe of the invention .
  • This neutral gas, air, nitrogen or any other suitable gas may be kept under pressure inside the waves of the corrugated tube, this pressure being able to constitute an insulating element fighting against the migration of the vapors of 1 inside or outside through the pipe wall.
  • connection of the two tubes will be sealed and preferably at each interior vertex of the corrugated tube.
  • the inner tube may include an internal conductive layer to allow the evacuation of the electrostatic charges generated by the friction of the fluid transported along the pipe. This limits the risk of explosion when the transported fluid is flammable.
  • the material of the tube 1 will be chosen as a function of its chemical resistance and its permeability to the fluid conveyed, while the material of the tube " 2 will be chosen mainly for its characteristics of resistance to the external atmosphere, chemical resistance and mechanical and corrosion resistance.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Laminated Bodies (AREA)

Abstract

A pipe for transporting automobile fluids, characterized in that it comprises a smooth inner tube (1) based on an elastomer thermoplastic material, an outer annellated tube (2) in contact with the inner tube by the inner vertex of the undulations thereof and which is made of a polyamide-based thermoplastic material, in addition to means for connecting the outer tube to the inner tube.

Description

Tuyau de transport de fluides, automobiles, comportant un tube intérieur lisse et un tube extérieur annelé, Automotive fluid transport hose, comprising a smooth inner tube and a corrugated outer tube,
La présente invention concerne un tuyau de transport de fluides automobiles tels que le liquide de refroidissement, le carburant, le liquide lave-glace...The present invention relates to a pipe for transporting automotive fluids such as coolant, fuel, windshield washer fluid, etc.
ARRIERE PLAN DE L'INVENTION Parmi les tuyaux utilisés dans un véhicule auto- mobile, on trouve des tuyau lisses de forts diamètres qui présentent des coudes et qui sont destinés par exemple à former la tubulure de remplissage du réservoir de carburant. Ces tuyaux sont réalisés par soufflage. Or, ce mode de fabrication est relativement coûteux. On a pensé à réaliser ceux-ci par extrusion puis formage à chaud, ce procédé de fabrication étant moins coûteux et permettant de plus d'obtenir des tuyaux relativement plus légers' que les tuyaux obtenus par soufflage. Toutefois, ce procédé s'est avéré délicat du fait que les tuyaux extrudés ont tendance à s'écraser lors de leur mise en forme.BACKGROUND OF THE INVENTION Among the pipes used in a motor vehicle, there are smooth pipes of large diameters which have elbows and which are intended, for example, to form the filler neck of the fuel tank. These pipes are made by blowing. However, this method of manufacture is relatively expensive. It was thought to realize thereof by extrusion and then hot forming, this manufacturing method is less costly and allows more to obtain relatively lighter pipes the pipes obtained by the swelling. However, this process has proven to be tricky because the extruded pipes tend to collapse during their shaping.
Ce type de problème se rencontre d'une manière générale dans tous les tuyaux lisses en matière plastique qui sont mis en forme de manière à y constituer des coudes pour que leur géométrie s'adapte à l'environnement dans lequel ils sont destinés à être implantés. Plus particulièrement, de telles structures ne conviennent plus pour des diamètres supérieurs à 25 mm car elles sont difficiles à mettre en oeuvre par thermoformage : un tube lisse de diamètre important a tendance à croquer dès qu'on lui impose un rayon de courbure trop petit.This type of problem is generally encountered in all smooth plastic pipes which are shaped so as to form elbows therein so that their geometry adapts to the environment in which they are intended to be installed. . More particularly, such structures are no longer suitable for diameters greater than 25 mm because they are difficult to implement by thermoforming: a smooth tube of large diameter tends to crunch as soon as a radius of curvature is imposed which is too small.
On a pensé à substituer à ces tuyaux lisses des tuyaux annelés dont la conformation est plus facile. Toutefois, apparaissent dans ces tuyaux des problèmes de moussage du fluide et en particulier du carburant, des problèmes de bruit et des problèmes de perte de charge.We thought of replacing these smooth pipes with corrugated pipes whose conformation is easier. However, there appear in these pipes problems of foaming of the fluid and in particular of the fuel, problems of noise and problems of pressure drop.
Par ailleurs, un autre inconvénient des tuyaux actuellement utilisés réside dans le fait qu'il est difficile d'obtenir une perméabilité suffisamment faible aux fluides automobiles, qui leur permette de remplir efficacement leur fonction. Cet inconvénient est particulière- ment gênant dans les tuyaux annelés qui présentent une grande surface en contact avec le fluide .By the way, another drawback of pipes currently used lies in the fact that it is difficult to obtain a sufficiently low permeability to automotive fluids, which allows them to effectively perform their function. This drawback is particularly troublesome in corrugated pipes which have a large surface in contact with the fluid.
Pour obvier à cet inconvénient, il est connu d'utiliser des tuyaux multicouches mais ceux-ci sont relativement onéreux. OBJET DE L'INVENTIONTo overcome this drawback, it is known to use multilayer pipes but these are relatively expensive. OBJECT OF THE INVENTION
Il serait donc intéressant de disposer de tuyaux de transport de fluides . automobiles qui remédient à au moins une partie des inconvénients des tuyaux de l'art antérieur. BREVE DESCRIPTION DE L'INVENTIONIt would therefore be advantageous to have pipes for transporting fluids. automobiles that overcome at least some of the disadvantages of prior art hoses. BRIEF DESCRIPTION OF THE INVENTION
A cet effet, on prévoit, selon l'invention, un tuyau de transport de fluides automobiles, comportant un tube intérieur lisse à base d'un matériau thermoplastique élastomère, un tube extérieur annelé qui est au contact du tube intérieur par le sommet intérieur de ses ondes et qui est en un matériau thermoplastique à base de polyamide, et des moyens de liaison du tube extérieur au tube intérieur.To this end, there is provided, according to the invention, a pipe for transporting automotive fluids, comprising a smooth inner tube based on an elastomeric thermoplastic material, an outer corrugated tube which is in contact with the inner tube through the inner top of its waves and which is made of a thermoplastic material based on polyamide, and means for connecting the outer tube to the inner tube.
Le tuyau ainsi obtenu est particulièrement bien adapté au transport des fluides automobiles et présente une bonne aptitude à être conformé, notamment par déformation élastique. Ce tuyau est en outre simple et peu coûteux à réaliser. Le matériau thermoplastique élastomère utilisé pour le tube intérieur permet en outre de réaliser simplement des connexions résistantes avec ' les organes auxquels le tuyau est raccordé, par exemple au moyen de tétines solidaires des organes et emmanchées à force dans le tube intérieur.The pipe thus obtained is particularly well suited to the transport of automotive fluids and has a good ability to be shaped, in particular by elastic deformation. This pipe is also simple and inexpensive to produce. The elastomeric thermoplastic material used for the inner tube also allows easy creation of resistant connections with 'the organs to which the hose is connected, for example by means of nipples integral with the bodies and force-fitted in the inner tube.
Selon un mode de réalisation particulier, les tu- bes sont monocouches, le polyamide utilisé est un poly- amide 12 et le thermoplastique élastomère est un mélange d'un polypropylène et d'un élastomère à base d'un monomère éthylène propylène diène.According to a particular embodiment, the tubes are monolayers, the polyamide used is a poly- amide 12 and the thermoplastic elastomer is a mixture of a polypropylene and an elastomer based on an ethylene propylene diene monomer.
Ce mode de réalisation présente de très bonnes caractéristiques pour le transport des fluides automobiles .This embodiment has very good characteristics for the transport of automotive fluids.
D'autres caractéristiques et avantages de l'invention ressortiront à la lecture de la description qui suit d'un mode de réalisation particulier non limitatif de l'invention.Other characteristics and advantages of the invention will emerge on reading the following description of a particular non-limiting embodiment of the invention.
BREVE DESCRIPTION DES DESSINS Il sera fait référence à la figure unique annexée représentant une demi-vue partielle, en coupe longitudinale, d'un tuyau conforme à l'invention. DESCRIPTION DETAILLEE D'UN MODE DE REALISATIONBRIEF DESCRIPTION OF THE DRAWINGS Reference will be made to the single appended figure representing a partial half-view, in longitudinal section, of a pipe according to the invention. DETAILED DESCRIPTION OF AN EMBODIMENT
DE L'INVENTION En référence à la figure, le tuyau de l'invention comporte un tube intérieur, généralement désigné en 1, et un tube extérieur, généralement désigné en 2, entourant le tube intérieur 1.OF THE INVENTION Referring to the figure, the pipe of the invention comprises an inner tube, generally designated at 1, and an outer tube, generally designated at 2, surrounding the inner tube 1.
Le tube intérieur 1 est un tube lisse ayant ici une structure monocouche en un matériau thermoplastique élastomère. Le matériau thermoplastique élastomère utilisé est un mélange d'un polypropylène et d'un caoutchouc à base d'un monomère d' éthylène propylène diène (EPDM) tel qu'un de ceux produits sous la référence SANTOPRENE par la société ADVANCED ELASTOMER SYSTEMS.The inner tube 1 is a smooth tube here having a single-layer structure of an elastomeric thermoplastic material. The elastomeric thermoplastic material used is a mixture of a polypropylene and a rubber based on an ethylene propylene diene monomer (EPDM) such as one of those produced under the reference SANTOPRENE by the company ADVANCED ELASTOMER SYSTEMS.
Le tube extérieur 2 est un tube annelé formant des ondes ayant un sommet intérieur 3 de diamètre inté- rieur égal ou très sensiblement voisin du diamètre extérieur du tube intérieur 1. Les tubes 1 et 2 sont reliés soit au niveau de chaque sommet 3 par collage ou par adhésion par exemple lors d'un procédé de coextrusion soit, si le tuyau est de longueur déterminée, à l'endroit de ses extrémités par simple butée mécanique du tube ex- térieur 2 contre une collerette du tube intérieur 1 avec ou sans collage des extrémités des tubes 1 et 2 l'une sur l'autre. Lorsqu'on souhaite que le tube intérieur 1 et le tube extérieur 2 soient solidaires au niveau de chaque sommet d'onde 3 du tube extérieur 2, on choisit bien entendu des matériaux susceptibles d'adhérer ou d'être collés les uns aux autres.The outer tube 2 is a corrugated tube forming waves having an inner vertex 3 of inner diameter equal to or very substantially close to the outer diameter of the inner tube 1. The tubes 1 and 2 are connected either at each vertex 3 by gluing or by adhesion for example during a coextrusion process either, if the pipe is of determined length, at the location of its ends by simple mechanical stop of the tube ex- térieur 2 against a flange of the inner tube 1 with or without bonding the ends of the tubes 1 and 2 to each other. When it is desired that the inner tube 1 and the outer tube 2 be secured at each wave vertex 3 of the outer tube 2, of course, materials are chosen which are capable of adhering or of being bonded to each other.
Le tube extérieur 2 a ici une structure monocouche en polyamide et de préférence en polyamide 12. Les matériaux utilisés peuvent être des matériaux recyclés issus par exemple du broyage de chutes de tubes, ce qui occasionne moins de pollution et engendre un gain économique .The outer tube 2 here has a monolayer structure of polyamide and preferably of polyamide 12. The materials used can be recycled materials originating, for example, from the grinding of scrap tubes, which causes less pollution and generates economic gain.
Le tuyau est ici obtenu au moyen d'une machine connue qui comporte une tête d'extrusion permettant de produire par un premier canal une paraison qui vient se plaquer sous l'effet d'une aspiration extérieure contre des moules articulés entourant la tête d'extrusion et se déplaçant parallèlement à l'axe de celle-ci. Un second canal d'extrusion permet en aval de l'extrusion de la paraison, de garnir le tube annelé que forme la paraison à l'intérieur des moules d'un tube lisse intérieur, ce qui permet de produire le tuyau de l'invention. On peut, de manière avantageuse, prévoir dans la tête d'extrusion un canal d'amenée, entre le tube annelé et le tube lisse, d'un gaz neutre qui coopérera à la diminution de la perméabilité du tuyau selon l'invention. Ce gaz neutre, de l'air, de l'azote ou tout autre gaz approprié, pourra être maintenu sous pression à 1 ' intérieur des ondes du tube annelé, cette pression pouvant constituer un élément d'isolement luttant contre la migration des vapeurs de 1 ' intérieur ou de 1 ' extérieur au travers de la paroi des tuyau .The pipe is obtained here by means of a known machine which comprises an extrusion head making it possible to produce, through a first channel, a parison which is pressed under the effect of an external suction against articulated molds surrounding the head of extrusion and moving parallel to the axis thereof. A second extrusion channel allows, downstream of the parison extrusion, to fill the corrugated tube formed by the parison inside the molds with an internal smooth tube, which makes it possible to produce the pipe of the invention . It is advantageously possible to provide in the extrusion head a supply channel, between the corrugated tube and the smooth tube, of a neutral gas which will cooperate in reducing the permeability of the pipe according to the invention. This neutral gas, air, nitrogen or any other suitable gas, may be kept under pressure inside the waves of the corrugated tube, this pressure being able to constitute an insulating element fighting against the migration of the vapors of 1 inside or outside through the pipe wall.
La liaison des deux tubes sera réalisée de ma- nière etanche et de préférence à chaque sommet intérieur d'onde du tube annelé.The connection of the two tubes will be sealed and preferably at each interior vertex of the corrugated tube.
Bien entendu, l'invention n'est pas limitée au mode de réalisation décrit et on peut y apporter des variantes de réalisation sans sortir du cadre de 1 ' inven- tion tel que défini par les revendications.Of course, the invention is not limited to the embodiment described and it is possible to make alternative embodiments without departing from the scope of the invention as defined by the claims.
En particulier, un autre matériau thermoplastique élastomère peut être utilisé pour le tube intérieur. De plus, le tube intérieur peut comprendre une couche interne conductrice afin de permettre l'évacuation des charges électrostatiques engendrées par le frottement du fluide transporté le long du tuyau. On limite ainsi le risque d'explosion lorsque le fluide transporté est inflammable. On choisira le matériau du tube 1 en fonction de sa résistance chimique et sa perméabilité au fluide véhiculé tandis que le matériau du tube "2 sera choisi principalement pour ses caractéristiques de résistance à l'égard de l'atmosphère extérieure, résistance au plan chimique et résistance au plan mécanique et de la corrosion. In particular, another elastomeric thermoplastic material can be used for the inner tube. In addition, the inner tube may include an internal conductive layer to allow the evacuation of the electrostatic charges generated by the friction of the fluid transported along the pipe. This limits the risk of explosion when the transported fluid is flammable. The material of the tube 1 will be chosen as a function of its chemical resistance and its permeability to the fluid conveyed, while the material of the tube " 2 will be chosen mainly for its characteristics of resistance to the external atmosphere, chemical resistance and mechanical and corrosion resistance.

Claims

REVENDICATIONS
1. Tuyau de transport de fluides automobiles, caractérisé en ce qu'il comporte un tube intérieur lisse (1) à base d'un matériau thermoplastique élastomère, un tube extérieur annelé (2) qui est au contact du tube intérieur par le sommet intérieur (3) de ses ondes et qui est en un matériau thermoplastique à base de polyamide et des moyens de liaison du tube extérieur au tube inté- rieur.1. Pipe for transporting automotive fluids, characterized in that it comprises a smooth inner tube (1) based on an elastomeric thermoplastic material, a corrugated outer tube (2) which is in contact with the inner tube through the inner top (3) of its waves and which is made of a thermoplastic material based on polyamide and means for connecting the outer tube to the inner tube.
2. Tuyau selon la revendication 1, caractérisé en ce que le polyamide utilisé est un polyamide 12.2. Pipe according to claim 1, characterized in that the polyamide used is a polyamide 12.
3. Tuyau selon la revendication 1 ou la revendication 2, caractérisé en ce que le thermoplastique élas- tomère est un mélange d'un polypropylène et d'un élastomère à base d'un monomère éthylène propylène diène.3. Pipe according to claim 1 or claim 2, characterized in that the elastomeric thermoplastic is a mixture of a polypropylene and an elastomer based on an ethylene propylene diene monomer.
4. Tuyau selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le tube intérieur (1) est monocouche . 4. Pipe according to any one of claims 1 to 3, characterized in that the inner tube (1) is monolayer.
5. Tuyau selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le tuyau extérieur (2) est monocouche . 5. Pipe according to any one of claims 1 to 4, characterized in that the outer pipe (2) is monolayer.
EP20030712276 2002-01-31 2003-01-22 Pipe for transporting automobile fluids, comprising a smooth inner tube and an outer annellated tube Ceased EP1470355A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0201135 2002-01-31
FR0201135A FR2835307B1 (en) 2002-01-31 2002-01-31 PIPE FOR TRANSPORTING AUTOMOTIVE FLUIDS, COMPRISING AN INTERIOR TUBE AND AN EXTERNAL RING TUBE
PCT/FR2003/000208 WO2003064911A1 (en) 2002-01-31 2003-01-22 Pipe for transporting automobile fluids, comprising a smooth inner tube and an outer annellated tube

Publications (1)

Publication Number Publication Date
EP1470355A1 true EP1470355A1 (en) 2004-10-27

Family

ID=27619769

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030712276 Ceased EP1470355A1 (en) 2002-01-31 2003-01-22 Pipe for transporting automobile fluids, comprising a smooth inner tube and an outer annellated tube

Country Status (5)

Country Link
US (1) US20050103392A1 (en)
EP (1) EP1470355A1 (en)
FR (1) FR2835307B1 (en)
MX (1) MXPA04007368A (en)
WO (1) WO2003064911A1 (en)

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US20040226623A1 (en) * 1999-10-12 2004-11-18 Oem/Miller, A Division Of Holm Industries Dual wall co-extruded corrugated tubing
JP4120476B2 (en) * 2003-05-27 2008-07-16 宇部興産株式会社 Corrugated tube
IT1401929B1 (en) * 2010-09-14 2013-08-28 Hutchinson Srl TUBE FOR THE TRANSFER OF A FLUID WITH PORTION (I) CORRUGATED (E) AND ITS MANUFACTURING PROCEDURE
CA2900578C (en) 2013-08-12 2017-11-07 Prinsco, Inc. Coilable dual wall corrugated pipe and related method
DE102014210149A1 (en) * 2014-05-27 2015-12-03 Schlemmer Gmbh Hose device for transporting a fluid for a household appliance, apparatus for a household appliance, household appliance and method
JP6786496B2 (en) * 2015-02-12 2020-11-18 デン ディ デ ノーラ パオロ Extendable hose
DE102015002791A1 (en) * 2015-03-06 2016-09-08 Kottmann Technology Gmbh Flexible corrugated hose
CN112344109B (en) * 2020-11-06 2022-08-19 贵州黔峰实业有限公司 Preparation and production process of modified polypropylene flat-wall reinforced corrugated pipe

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Also Published As

Publication number Publication date
MXPA04007368A (en) 2004-11-26
US20050103392A1 (en) 2005-05-19
WO2003064911A1 (en) 2003-08-07
FR2835307A1 (en) 2003-08-01
FR2835307B1 (en) 2004-05-21

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