WO2006059050A1 - Protective device for a fuel feed pipe - Google Patents

Protective device for a fuel feed pipe Download PDF

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Publication number
WO2006059050A1
WO2006059050A1 PCT/FR2005/051030 FR2005051030W WO2006059050A1 WO 2006059050 A1 WO2006059050 A1 WO 2006059050A1 FR 2005051030 W FR2005051030 W FR 2005051030W WO 2006059050 A1 WO2006059050 A1 WO 2006059050A1
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WO
WIPO (PCT)
Prior art keywords
fuel
protection
protective
elements
bearing portion
Prior art date
Application number
PCT/FR2005/051030
Other languages
French (fr)
Inventor
Jean Michel Detouche
Pascal Beaucamp
Original Assignee
Renault S.A.S
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 Renault S.A.S filed Critical Renault S.A.S
Publication of WO2006059050A1 publication Critical patent/WO2006059050A1/en

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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
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
    • F16L55/179—Devices for covering leaks in pipes or hoses, e.g. hose-menders specially adapted for bends, branch units, branching pipes or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/18—Fuel-injection apparatus having means for maintaining safety not otherwise provided for

Definitions

  • the present invention relates to the field of protective devices adapted to connections of pressurized fuel supply pipes, including fuel injection pump pipes for internal combustion engines of motor vehicles.
  • an injection pump provides a pressurized distribution of the fuel to a supply ramp on which fuel supply lines equipped with fuel injectors are connected. extend inside the combustion chamber of the engine and which allow the spraying of the fuel.
  • fuel leakage may occur at the connection between the injection pump and the supply manifold, and / or between each supply line connected to said ramp and the associated fuel injector.
  • document JP-A-2000-320426 discloses a fuel supply pipe coupling of an engine with internal combustion provided with an annular clamping nut comprising a floor bore inside which is mounted the supply pipe, an annular body screwed inside the body, and an orifice disposed at the level of the nut, near an end of the discharge pipe, and adapted to allow a flow of fuel to the outside of the fitting.
  • Said end of the pipe comprises a frustoconical portion cooperating with a correspondingly shaped portion of the body, forming a seat.
  • the coupling also comprises a plurality of seals, disposed axially on either side of the discharge orifice, and mounted between the clamping nut and the supply pipe, and between the clamping nut. and the body.
  • connection has a high number of seals
  • connection comprises a relatively complex and expensive form of clamping piece, which may be incompatible with mass industrialization.
  • possible fuel leaks near the engine are particularly detrimental to the safety of the occupants of the motor vehicle.
  • the present invention therefore aims to overcome these disadvantages by providing a protective device adapted to an efficient pressure fuel pipe connection, economical, simple design, and particularly easy to assemble.
  • the subject of the invention is a protective device adapted to a pipe connection for supplying pressurized fuel, in particular of high pressure pipe of a fuel injection pump for an internal combustion engine of a motor vehicle. , comprising two protection elements delimiting an enclosure closed for the containment of fuel leakage from the connection, and a discharge orifice formed at one of said protective elements, and adapted to allow a flow of fuel to the outside.
  • a protective device it thus becomes possible to contain the fuel leaks due to a poor seal of the connection, and to drive said fuel outwards, for example to a storage tank, in order to significantly reduce the risk of contact between the fuel and engine components having a high temperature, or bodies having safety functions such as the brake system.
  • each protection element comprises a concave portion of substantially hemispherical shell profile and a flat bearing portion, the bearing portion of a protective element being in contact with the corresponding bearing portion of the other protection element.
  • the device comprises at least one seal, mounted on at least one of the support portions, and adapted to seal the enclosure.
  • each protection element comprises two coaxial semicircular bearings intended to be in contact with the connection and the supply pipe.
  • the device comprises seals mounted on said spans.
  • the device further comprises a discharge nozzle extending from the discharge orifice.
  • the exhaust tip makes it possible to quickly and easily connect a conduit adapted to allow the flow of fuel to a storage tank, or to a conduit of the engine supply circuit so that the fuel is directly recycled.
  • the device comprises a flexible connecting element connecting the protection elements to each other.
  • the connecting element and the protection elements can advantageously be monoblock.
  • the connecting element thus makes it possible to obtain a unitary assembly that can be handled, transported and mounted at the connection with the risk of accidentally separating these elements, which is particularly low.
  • each protection element comprises fastening means able to cooperate with complementary fastening means of the other protection element.
  • the protective elements are made of molded synthetic material. The protection device thus has a particularly low cost price.
  • FIG. 1 is a perspective view of a pump fuel injection comprising a high pressure fuel outlet fitting
  • FIG. 2 is a perspective view of the pump of FIG. 1 on which a protection device according to the invention is mounted
  • FIG. 3 is a perspective view of the protection device of FIG. 2 in a position of use.
  • Figure 4 is a perspective view of the device of Figure 2 in an "open" use position.
  • FIGS 1 and 2 there is shown an injection pump 1 for supplying diesel fuel of a diesel type internal combustion engine (not shown), through a high pressure hose 2.
  • the injection pump 1 is connected to the pipe 2 by a mechanical clamping coupling 3 provided with an annular body 4 comprising a net
  • the pipe 2 is fitted, in known manner, inside the connector 3.
  • the pipe 2 may comprise derived supply lines (not shown), each pipe being associated with a fuel injector, via a coupling of the same type as those previously defined.
  • a device 6 for protection is used for the containment of leakage of diesel said fitting 3 and to allow evacuation of fuel outwardly through a discharge conduit 6a connected to said device 6.
  • the device 6 is mounted around the connector 3.
  • the protection device 6 has a generally annular shape, with an axis 7, and comprises two protection elements 8, 9 connected to each other by a single-piece connection 22, made in the form of The protective elements 8, 9 respectively have a substantially hemispherical profile in cross section.
  • Each protection element 8, 9 comprises a concave shell formation 10, 11 oriented towards the axis 7, and a bearing portion 12, 13 extending outwardly the shell 10, 11
  • the support portion 12, 13 extends, radially and axially, the hull
  • the support portion 12, 13 foime a peripheral rim having in plan view a generally rectangular general shape
  • the shells 10, 11 and the support portions 12, 13 are substantially identical to each other
  • the bearing portions 12, 13 are flat and in contact with each other, said portions being symmetrical with each other with respect to an axial plane containing the axis 7.
  • the protective elements 8, 9 thus form a closed enclosure. inside which the connector 3 is mounted (FIG. 1).
  • the protection elements 8, 9 are shaped according to the dimensions of said connector 3.
  • Each protection element 8, 9 also comprises two coaxial semicircular bearings 14 and 15, 16 and 17 and mounted at each axial end of said protection element, at the level of the bearing portion 12, 13.
  • the bearing surface 14, 16 has a radial dimension substantially reduced relative to that of the bearing surface 15, 17, said bearing surfaces 14, 16 and 15, 17 being respectively adapted to the pipe 2 and to the coupling 3 (FIG. 1)
  • the protective element 8 comprises fastening means in the form of clips 18 or hooks, here four in number.
  • the clips 18 are arranged in pairs at each axial side of the bearing portion 12.
  • the protective element 9 comprises complementary fastening means, four in number, and made here in the form of legs 19, each of said tabs 19 being provided with a recess (not referenced) adapted to allow the passage of the corresponding clip 18.
  • the protection element 9 comprises, at the level of the shell 10, a discharge orifice 20 passing right through said shell.
  • the device 6 also includes an exhaust tip 21, here made of material with the shell 10, and extending from said orifice 20.
  • the nozzle 21 allows the mounting of the discharge pipe 6a ( Figure 1).
  • the evacuation pipe 6a is intended to drive the diesel to a diesel storage tank, or to a pipe of the engine supply circuit so that the diesel is directly recycled.
  • the tank may be a tank dedicated specifically for the recovery of fuel, or the main fuel tank of the vehicle.
  • the connecting element 22 has a small thickness, for example of the order of a millimeter, in order to obtain a certain flexibility to achieve the fixing of a protective element relative to the other.
  • the protection element 8, the shell 11, the support portion 12, the clips 18, the protection element 9, the shell 10. the support portion 13, the tabs 19, and the connecting element 22 are monoblocks.
  • the device 6 is made of rigid molded synthetic material, for example polypropylene.
  • the device 6 also comprises seals 23, 24 respectively mounted on the bearing portions 12, 13 of the protection elements 8, 9. Said seals 23, 24 are also supported at the bearing surfaces 14 and 15, 16 and 17.
  • the seals 23, 24 thus mounted on the periphery of the enclosure delimited by the shells 10, 11 of the protection elements 8, 9 are sandwiched during assembly of the device 6 and thus allow the obtaining a sealed enclosure.
  • the protection device thus has the advantage of being able to contain any gas oil leaks at the connection, and to channel said leaks towards a non-hazardous area, thus substantially reducing possible fire risks at the level of the engine. internal combustion.

Abstract

The invention relates to a protective device that is intended for a pressurised fuel feed pipe connector (3), such as a high-pressure pipe of a fuel injection pump for the internal combustion engine of a motor vehicle. The inventive device comprises: two protective elements (8, 9) which define a sealed chamber for containing fuel leaks from the connector, and a discharge port which is provided on one of the protective elements and which enables the fuel to flow to the exterior.

Description

DISPOSITIF DE PROTECTION POUR UN TUYAU D'ALIMENTATION EN CARBURANTPROTECTIVE DEVICE FOR A FUEL SUPPLY PIPE
La présente invention concerne le domaine des dispositifs de protection adaptés à des raccords de tuyaux d'alimentation en carburant sous pression, notamment de tuyaux de pompes d'injection de carburant pour moteurs à combustion interne de véhicules automobiles.The present invention relates to the field of protective devices adapted to connections of pressurized fuel supply pipes, including fuel injection pump pipes for internal combustion engines of motor vehicles.
Dans un moteur à combustion interne de véhicule automobile, notamment dans un moteur Diesel, une pompe d'injection assure une distribution sous pression du carburant à une rampe d'alimentation sur laquelle sont connectées des conduites d'alimentation pourvues d'injecteurs de carburant qui s'étendent à l'intérieur de la chambre de combustion du moteur et qui permettent la pulvérisation du carburant. Dans ce type de moteur, des fuites de carburant peuvent survenir au niveau du raccordement entre la pompe d'injection et la rampe d'alimentation, et/ou entre chaque conduite d'alimentation reliée à ladite rampe et l'injecteur de carburant associé.In an internal combustion engine of a motor vehicle, in particular in a diesel engine, an injection pump provides a pressurized distribution of the fuel to a supply ramp on which fuel supply lines equipped with fuel injectors are connected. extend inside the combustion chamber of the engine and which allow the spraying of the fuel. In this type of engine, fuel leakage may occur at the connection between the injection pump and the supply manifold, and / or between each supply line connected to said ramp and the associated fuel injector.
Compte tenu de la pression à laquelle est soumis le carburant, généralement supérieure à 900 bars, le carburant fuit sous une forme pulvérisée qui est facilement inflammable. Le carburant pulvérisé est ainsi susceptible de venir en contact avec des organes du moteur présentant une température relativement élevée pouvant provoquer des débuts d'incendie.Due to the pressure of the fuel, generally above 900 bar, the fuel leaks in a spray form that is highly flammable. The pulverized fuel is thus likely to come into contact with engine components having a relatively high temperature which may cause a start of fire.
A cet effet, on connaît, par le document JP-A-2000-320426, un raccord de tuyau d'alimentation en carburant d'un moteur à combustion interne pourvu d'un écrou de serrage annulaire comprenant un alésage étage à l'intérieur duquel est monté Ie tuyau d'alimentation, d'un corps annulaire vissé à l'intérieur du corps, et d'un orifice disposé au niveau de l'écrou, à proximité d'une extrémité du tuyau d'évacuation, et apte à permettre un écoulement du carburant vers l'extérieur du raccord. Ladite extrémité du tuyau comprend une portion tronconique coopérant avec une portion de forme correspondante du corps, formant siège. Le raccord comprend également une pluralité de joints d'étanchéité, disposés axialement de part et d'autre de l'orifice d'évacuation, et montés entre l'écrou de serrage et le tuyau d'alimentation, et entre l'écrou de serrage et le corps.For this purpose, document JP-A-2000-320426 discloses a fuel supply pipe coupling of an engine with internal combustion provided with an annular clamping nut comprising a floor bore inside which is mounted the supply pipe, an annular body screwed inside the body, and an orifice disposed at the level of the nut, near an end of the discharge pipe, and adapted to allow a flow of fuel to the outside of the fitting. Said end of the pipe comprises a frustoconical portion cooperating with a correspondingly shaped portion of the body, forming a seat. The coupling also comprises a plurality of seals, disposed axially on either side of the discharge orifice, and mounted between the clamping nut and the supply pipe, and between the clamping nut. and the body.
Outre le fait que le raccord présente un nombre élevé de joints d'étanchéité, le raccord comprend une pièce de serrage de forme relativement complexe et coûteuse, pouvant être incompatible avec une industrialisation en grande série. Par ailleurs, en cas de défaillance du raccord, d'éventuelles fuites de carburant à proximité du moteur sont particulièrement néfastes pour la sécurité des occupants du véhicule automobile. La présente invention a donc pour but de remédier à ces inconvénients en proposant un dispositif de protection adapté à un raccord de tuyau d'alimentation en carburant sous pression efficace, économique, de conception simple, et particulièrement facile à monter.In addition to the fact that the connection has a high number of seals, the connection comprises a relatively complex and expensive form of clamping piece, which may be incompatible with mass industrialization. Furthermore, in case of failure of the connection, possible fuel leaks near the engine are particularly detrimental to the safety of the occupants of the motor vehicle. The present invention therefore aims to overcome these disadvantages by providing a protective device adapted to an efficient pressure fuel pipe connection, economical, simple design, and particularly easy to assemble.
A cet effet, l'invention a pour objet un dispositif de protection adapté à un raccord de tuyau d'alimentation en carburant sous pression, notamment de tuyau haute pression d'une pompe d'injection de carburant pour moteur à combustion interne de véhicule automobile, comprenant deux éléments de protection délimitant une enceinte fermée pour le confinement de fuites de carburant du raccord, et un orifice d'évacuation, ménagé au niveau d'un desdits éléments de protection, et apte à permettre un écoulement du carburant vers l 'extérieur. Avec un tel dispositif de protection, il devient ainsi possible de contenir les fuites de carburant dues à une mauvaise étanchéité du raccord, et de conduire ledit carburant vers l'extérieur, par exemple vers un réservoir de stockage, afin de réduire sensiblement le risque de contact entre le carburant et des organes du moteur présentant une température élevée, ou encore des organes ayant des fonctions de sécurité comme le circuit de freinage. En d'autres termes, le dispositif permet d'accroître la sûreté de fonctionnement du moteur à combustion interne et des organes environnants, lors d'une défaillance du raccord. Selon un aspect préféré, chaque élément de protection comprend une portion concave de profil sensiblement hémisphérique formant coque et une portion d'appui plane, la portion d'appui d'un élément de protection étant en contact avec la portion d'appui correspondante de l'autre élément de protection. Avantageusement, le dispositif comprend au moins un joint, monté sur au moins une des portions d'appui, et apte à réaliser l'étanchéité de l'enceinte.For this purpose, the subject of the invention is a protective device adapted to a pipe connection for supplying pressurized fuel, in particular of high pressure pipe of a fuel injection pump for an internal combustion engine of a motor vehicle. , comprising two protection elements delimiting an enclosure closed for the containment of fuel leakage from the connection, and a discharge orifice formed at one of said protective elements, and adapted to allow a flow of fuel to the outside. With such a protective device, it thus becomes possible to contain the fuel leaks due to a poor seal of the connection, and to drive said fuel outwards, for example to a storage tank, in order to significantly reduce the risk of contact between the fuel and engine components having a high temperature, or bodies having safety functions such as the brake system. In other words, the device increases the operational safety of the internal combustion engine and surrounding organs, during a failure of the fitting. According to a preferred aspect, each protection element comprises a concave portion of substantially hemispherical shell profile and a flat bearing portion, the bearing portion of a protective element being in contact with the corresponding bearing portion of the other protection element. Advantageously, the device comprises at least one seal, mounted on at least one of the support portions, and adapted to seal the enclosure.
De préférence, chaque élément de protection comprend deux portées demi-circulaires coaxiales destinées à être en contact avec le raccord et le tuyau d'alimentation. Préférentiellement, le dispositif comprend des joints d'étanchéité montés sur lesdites portées. Selon un aspect avantageux de l'invention, le dispositif comprend, en outre, un embout d'évacuation s'étendant à partir de l'orifice d'évacuation.Preferably, each protection element comprises two coaxial semicircular bearings intended to be in contact with the connection and the supply pipe. Preferably, the device comprises seals mounted on said spans. According to an advantageous aspect of the invention, the device further comprises a discharge nozzle extending from the discharge orifice.
L'embout d'évacuation permet de connecter rapidement et facilement un conduit apte à permettre l'écoulement du carburant vers un réservoir de stockage, ou vers une conduite du circuit d'alimentation du moteur afin que le carburant soit directement recyclé.The exhaust tip makes it possible to quickly and easily connect a conduit adapted to allow the flow of fuel to a storage tank, or to a conduit of the engine supply circuit so that the fuel is directly recycled.
Dans un mode de réalisation préféré, le dispositif comprend un élément de liaison souple reliant les éléments de protection entre eux.In a preferred embodiment, the device comprises a flexible connecting element connecting the protection elements to each other.
L'élément de liaison et les éléments de protection peuvent avantageusement être monoblocs.The connecting element and the protection elements can advantageously be monoblock.
L'élément de liaison permet ainsi d'obtenir un ensemble unitaire pouvant être manipulé, transporté et monté au niveau du raccord avec des risques de séparation accidentelle de ces éléments particulièrement faible.The connecting element thus makes it possible to obtain a unitary assembly that can be handled, transported and mounted at the connection with the risk of accidentally separating these elements, which is particularly low.
De préférence, chaque élément de protection comprend des moyens de fixation aptes à coopérer avec des moyens de fixation complémentaires de l'autre élément de protection. Dans un mode de réalisation préférée, les éléments de protection sont réalisés en matière synthétique moulée. Le dispositif de protection présente ainsi un prix de revient particulièrement faible.Preferably, each protection element comprises fastening means able to cooperate with complementary fastening means of the other protection element. In a preferred embodiment, the protective elements are made of molded synthetic material. The protection device thus has a particularly low cost price.
La présente invention sera mieux comprise à la lecture de la description détaillée d'un mode de réalisation pris à titre d'exemple nullement limitatif et illustré par les dessins annexés, sur lesquels : la figure 1 est une vue en perspective d'une pompe d'injection de carburant comprenant un raccord de sortie de carburant haute pression, la figure 2 est une vue en perspective de la pompe de la figure 1 sur laquelle est monté un dispositif de protection selon l 'invention, la figure 3 est une vue en perspective du dispositif de protection de la figure 2 dans une position d'utilisation diteThe present invention will be better understood on reading the detailed description of an embodiment taken by way of nonlimiting example and illustrated by the appended drawings, in which: FIG. 1 is a perspective view of a pump fuel injection comprising a high pressure fuel outlet fitting, FIG. 2 is a perspective view of the pump of FIG. 1 on which a protection device according to the invention is mounted, FIG. 3 is a perspective view of the protection device of FIG. 2 in a position of use. called
« fermée », et la figure 4 est une vue en perspective du dispositif de la figure 2 dans une position d'utilisation dite « ouverte »."Closed", and Figure 4 is a perspective view of the device of Figure 2 in an "open" use position.
Sur les figures 1 et 2, on a représenté une pompe d'injection 1 permettant l'alimentation en gasoil d'un moteur à combustion interne du type Diesel (non représenté), par l'intermédiaire d'un tuyau 2 haute pression. La pompe d'injection 1 est reliée au tuyau 2 par un raccord 3 à serrage mécanique pourvu d'un corps 4 annulaire comprenant un filetIn Figures 1 and 2, there is shown an injection pump 1 for supplying diesel fuel of a diesel type internal combustion engine (not shown), through a high pressure hose 2. The injection pump 1 is connected to the pipe 2 by a mechanical clamping coupling 3 provided with an annular body 4 comprising a net
(non représenté) permettant la fixation du raccord 3 sur la pompe d'injection 1, et d'un écrou de serrage 5 annulaire fixé à l'intérieur du corps 4.(not shown) for fixing the connector 3 on the injection pump 1, and an annular clamping nut 5 fixed inside the body 4.
Le tuyau 2 est emmanché, de façon connue, à l'intérieur du raccord 3. Le tuyau 2 peut comprendre des conduites d'alimentation dérivées (non représentées), chaque conduite étant associée à un injecteur de carburant, par l'intermédiaire de raccord du même type que ceux précédemment définis.The pipe 2 is fitted, in known manner, inside the connector 3. The pipe 2 may comprise derived supply lines (not shown), each pipe being associated with a fuel injector, via a coupling of the same type as those previously defined.
Un dispositif 6 de protection est utilisé pour le confinement de fuites de gasoil dudit raccord 3 et pour permettre l'évacuation vers l'extérieur du gasoil par l'intermédiaire d'un conduit d'évacuation 6a relié audit dispositif 6. Comme illustré sur la figure 2, le dispositif 6 est monté autour du raccord 3. Toutefois, on conçoit aisément qu'un tel dispositif 6 puisse être monté au niveau des raccords reliant les injecteurs aux conduites d'alimentation en carburant. Comme illustré plus visiblement sur les figures 3 et 4, le dispositif 6 de protection présente une forme générale annulaiie, d'axe 7, et comprend deux éléments de protection 8, 9 relies entre eux par une liaison 22 monobloc, réalisée sous la forme d'une languette Les éléments de protection 8, 9 présentent respectivement en section droite un profil sensiblement hémisphériqueA device 6 for protection is used for the containment of leakage of diesel said fitting 3 and to allow evacuation of fuel outwardly through a discharge conduit 6a connected to said device 6. As illustrated in Figure 2, the device 6 is mounted around the connector 3. However, it is readily conceivable that such a device 6 can be mounted at the connections connecting the injectors to the fuel supply lines. As illustrated more clearly in FIGS. 3 and 4, the protection device 6 has a generally annular shape, with an axis 7, and comprises two protection elements 8, 9 connected to each other by a single-piece connection 22, made in the form of The protective elements 8, 9 respectively have a substantially hemispherical profile in cross section.
Chaque élément de protection 8, 9 comprend une poition concave formant coque 10, 11, orientée en direction de l'axe 7, et une portion d'appui 12, 13 prolongeant vers l'extérieur la coque 10, 11 La portion d'appui 12, 13 prolonge, radialement et axialement, la coqueEach protection element 8, 9 comprises a concave shell formation 10, 11 oriented towards the axis 7, and a bearing portion 12, 13 extending outwardly the shell 10, 11 The support portion 12, 13 extends, radially and axially, the hull
10, 11 En d'autres termes, la portion d'appui 12, 13 foime un rebord périphérique présentant en vue de dessus une forme générale sensiblement rectangulaire Les coques 10, 11 et les portions d'appui 12, 13 sont sensiblement identiques entre elles Les portions d'appui 12, 13 sont planes et en contact l'une avec l'autre, lesdites portions étant symétriques entre elles par rapport à un plan axial contenant l'axe 7 Les éléments de protection 8, 9 forment ainsi une enceinte fermée à l'intérieur de laquelle est monté le raccord 3 (figure 1) Bien entendu, les éléments de protection 8, 9 sont conformés en fonction des dimensions dudit raccord 310, 11 In other words, the support portion 12, 13 foime a peripheral rim having in plan view a generally rectangular general shape The shells 10, 11 and the support portions 12, 13 are substantially identical to each other The bearing portions 12, 13 are flat and in contact with each other, said portions being symmetrical with each other with respect to an axial plane containing the axis 7. The protective elements 8, 9 thus form a closed enclosure. inside which the connector 3 is mounted (FIG. 1). Of course, the protection elements 8, 9 are shaped according to the dimensions of said connector 3.
Chaque élément de protection 8, 9 comprend également deux portées 14 et 15, 16 et 17 demi-circulaires coaxiales et montées à chaque extrémité axiale dudit élément de protection, au niveau de la portion d'appui 12, 13 La portée 14, 16 présente une dimension radiale sensiblement réduite par rapport à celle de la portée 15, 17, lesdites portées 14, 16 et 15, 17 étant adaptées respectivement au tuyau 2 et au raccord 3 (figure 1) L'élément de protection 8 comprend des moyens de fixation réalisés sous forme de clips 18 ou crochets, ici au nombre de quatre. Les clips 18 sont disposés par paire au niveau de chaque côté axial de la portion d'appui 12. D'une manière analogue, l'élément de protection 9 comprend des moyens de fixation complémentaires, au nombre de quatre, et réalisés ici sous forme de pattes 19, chacune desdites pattes 19 étant pourvue d'un évidemment (non référencé) apte à permettre le passage du clips 18 correspondant.Each protection element 8, 9 also comprises two coaxial semicircular bearings 14 and 15, 16 and 17 and mounted at each axial end of said protection element, at the level of the bearing portion 12, 13. The bearing surface 14, 16 has a radial dimension substantially reduced relative to that of the bearing surface 15, 17, said bearing surfaces 14, 16 and 15, 17 being respectively adapted to the pipe 2 and to the coupling 3 (FIG. 1) The protective element 8 comprises fastening means in the form of clips 18 or hooks, here four in number. The clips 18 are arranged in pairs at each axial side of the bearing portion 12. In a similar way, the protective element 9 comprises complementary fastening means, four in number, and made here in the form of legs 19, each of said tabs 19 being provided with a recess (not referenced) adapted to allow the passage of the corresponding clip 18.
Bien entendu, il est également envisageable de prévoir d'autres moyens de fixation pour assembler les éléments de protection, par exemple une fixation par l'intermédiaire de vis, ou encore un collier à vis. Toutefois, le type de fixation tel qu'illustré sur les figures est particulièrement économique et facilite le montage du dispositif 6, l'assujettissement d'un élément de protection 8, 9 par rapport à l'autre étant réalisé par une simple poussée sur lesdits éléments.Of course, it is also conceivable to provide other fastening means for assembling the protection elements, for example an attachment by means of screws, or a screw collar. However, the type of attachment as shown in the figures is particularly economical and facilitates the mounting of the device 6, the securing of a protective element 8, 9 relative to the other being achieved by a simple push on said elements.
L'élément de protection 9 comprend, au niveau de la coque 10, un orifice d'évacuation 20 traversant de part en part ladite coque. Le dispositif 6 comprend également un embout 21 d'évacuation, ici venu de matière avec la coque 10, et s'étendant à partir dudit orifice 20. L'embout 21 permet le montage du tuyau d'évacuation 6a (figure 1).The protection element 9 comprises, at the level of the shell 10, a discharge orifice 20 passing right through said shell. The device 6 also includes an exhaust tip 21, here made of material with the shell 10, and extending from said orifice 20. The nozzle 21 allows the mounting of the discharge pipe 6a (Figure 1).
Le tuyau d'évacuation 6a est prévu pour conduire le gasoil vers un réservoir de stockage du gasoil, ou encore vers une conduite du circuit d'alimentation du moteur afin que le gasoil soit directement recyclé. Le réservoir peut être un réservoir dédié spécifiquement pour la récupération du carburant, ou encore le réservoir principal de carburant du véhicule.The evacuation pipe 6a is intended to drive the diesel to a diesel storage tank, or to a pipe of the engine supply circuit so that the diesel is directly recycled. The tank may be a tank dedicated specifically for the recovery of fuel, or the main fuel tank of the vehicle.
L'élément de liaison 22 présente une épaisseur faible, par exemple de l'ordre du millimètre, afin d'obtenir une certaine flexibilité pour réaliser la fixation d'un élément de protection par rapport à l'autre. L'élément de protection 8, la coque 11 , la portion d'appui 12, les clips 18, l'élément de protection 9, la coque 10. la portion d'appui 13, les pattes 19, et l'élément de liaison 22 sont monoblocs. Avantageusement, le dispositif 6 est réalisé en matière synthétique moulée rigide, par exemple en polypropylène.The connecting element 22 has a small thickness, for example of the order of a millimeter, in order to obtain a certain flexibility to achieve the fixing of a protective element relative to the other. The protection element 8, the shell 11, the support portion 12, the clips 18, the protection element 9, the shell 10. the support portion 13, the tabs 19, and the connecting element 22 are monoblocks. Advantageously, the device 6 is made of rigid molded synthetic material, for example polypropylene.
Le dispositif 6 comprend également des joints d'étanchéité 23, 24 montés respectivement sur les portions d'appui 12, 13 des éléments de protection 8, 9. Lesdits joints 23, 24 viennent également en appui au niveau des portées 14 et 15, 16 et 17. Les joints d'étanchéité 23, 24 montés ainsi à la périphérie de l'enceinte délimitée par les coques 10, 11 des éléments de protection 8, 9 sont serrés en sandwich lors de l'assemblage du dispositif 6 et permettent ainsi l'obtention d'une enceinte fermée étanche. Le dispositif de protection présente ainsi l'avantage de pouvoir contenir les éventuelles fuites de gasoil au niveau du raccord, et de canaliser lesdites fuites en direction d'une zone non dangereuse, réduisant ainsi sensiblement des éventuels risques d'incendie au niveau du moteur à combustion interne. The device 6 also comprises seals 23, 24 respectively mounted on the bearing portions 12, 13 of the protection elements 8, 9. Said seals 23, 24 are also supported at the bearing surfaces 14 and 15, 16 and 17. The seals 23, 24 thus mounted on the periphery of the enclosure delimited by the shells 10, 11 of the protection elements 8, 9 are sandwiched during assembly of the device 6 and thus allow the obtaining a sealed enclosure. The protection device thus has the advantage of being able to contain any gas oil leaks at the connection, and to channel said leaks towards a non-hazardous area, thus substantially reducing possible fire risks at the level of the engine. internal combustion.

Claims

REVENDICATIONS
1/ Dispositif de protection adapté à un raccord (3) de tuyau d'alimentation en carburant sous pression, notamment de tuyau haute pression d'une pompe d'injection de carburant pour moteur à combustion interne de véhicule automobile, caractérisé en ce qu'il comprend deux éléments de protection (8, 9) délimitant une enceinte fermée pour le confinement de fuites de carburant du raccord, et un orifice d'évacuation (20) ménagé au niveau d'un desdits cléments de protection et traversant de part en part ledit élément, et d'un embout d'évacuation (21) s'étendant à partir dudit orifice et apte à permettre un écoulement vers l'extérieur des fuites de carburant contenues dans l'enceinte.1 / Protection device adapted to a connection (3) of pressurized fuel supply pipe, in particular of high pressure pipe of a fuel injection pump for an internal combustion engine of a motor vehicle, characterized in that it comprises two protection elements (8, 9) defining an enclosure for containment of fuel leakage of the fitting, and a discharge port (20) formed at one of said protection clement and passing from side to side said element, and a discharge tip (21) extending from said port and adapted to allow flow outward leakage of fuel contained in the chamber.
2/ Dispositif selon la revendication 1, caractérise en ce que chaque élément de protection (8, 9) comprend une portion concave de profil sensiblement hémisphérique formant coque (10, 11) et une portion d'appui plane (12, 13), la portion d'appui (12) d'un élément de protection étant en contact avec la portion d'appui (13) correspondante de l'autre élément de protection.2 / Apparatus according to claim 1, characterized in that each protective element (8, 9) comprises a concave portion of substantially hemispherical profile forming shell (10, 11) and a flat bearing portion (12, 13), the bearing portion (12) of a protection member in contact with the bearing portion (13) corresponding to the other shielding element.
3/ Dispositif selon la revendication 2, caractérise en ce qu'il comprend au moins un joint (23, 24), monté sur au moins une des portions d'appui, et apte à réaliser l'étanchéité de l'enceinte fermée.3 / Device according to Claim 2, characterized in that it comprises at least one seal (23, 24) mounted on at least one of the support portions and adapted to seal the closed enclosure.
4/ Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que chaque élément de protection (8,4 / Apparatus according to any one of the preceding claims, characterized in that each protection element (8,
9) comprend deux portées (14, 15, 16, 17) demi -circulaires coaxiales destinées à être en contact avec le raccord et le tuyau d'alimentation. 5/ Dispositif selon la revendication 4. caractérisé en ce qu'il comprend des joints d'étanchéité (23, 24) montés sur lesdites portées.9) comprises two bearings (14, 15, 16, 17) coaxial half -Circulars intended to be in contact with the connector and the supply pipe. 5 / Apparatus as claimed in claim 4. characterized in that it comprises seals (23, 24) mounted on said lands.
6/ Dispositif selon Tune quelconque des revendications précédentes, caractérisé en ce qu'il comprend un élément de liaison6 / Apparatus according to any one of the preceding claims, characterized in that it comprises a connecting element
(22) souple reliant les éléments de protection entre eux.(22) flexible connecting the protection elements to each other.
Il Dispositif selon la revendication 6, caractérisé en ce que l'élément de liaison et les éléments de protection soni monoblocs.He apparatus according to claim 6, characterized in that the connecting element and soni-piece protective elements.
8/ Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que chaque élément de protection comprend des moyens de fixation aptes à coopérer avec des moyens de fixation complémentaires de l'autre élément de protection.8 / Apparatus according to any one of the preceding claims, characterized in that each protective element comprises fastening means able to cooperate with complementary attachment means of the other shielding member.
9/ Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les éléments de protection sont réalisés en matière synthétique moulée. 9 / Apparatus according to any one of the preceding claims, characterized in that the protective elements are made of molded synthetic material.
PCT/FR2005/051030 2004-12-03 2005-12-02 Protective device for a fuel feed pipe WO2006059050A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0412897 2004-12-03
FR0412897A FR2878935A1 (en) 2004-12-03 2004-12-03 PROTECTIVE DEVICE ADAPTED TO A CONNECTION OF A PRESSURIZED FUEL SUPPLY PIPE, IN PARTICULAR A HIGH PRESSURE PIPE OF A FUEL INJECTION PUMP FOR AN INTERNAL COMBUSTION ENGINE OF A MOTOR VEHICLE

Publications (1)

Publication Number Publication Date
WO2006059050A1 true WO2006059050A1 (en) 2006-06-08

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PCT/FR2005/051030 WO2006059050A1 (en) 2004-12-03 2005-12-02 Protective device for a fuel feed pipe

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FR (1) FR2878935A1 (en)
WO (1) WO2006059050A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008062045A1 (en) 2006-11-24 2008-05-29 Renault S.A.S Protection shell for liquid pipe connectors
WO2009123291A1 (en) 2008-04-02 2009-10-08 株式会社ニフコ Pipe joint cover
EP1923563B1 (en) * 2006-11-18 2017-01-11 ElringKlinger AG Safety system and method of use
FR3067441A1 (en) * 2017-06-12 2018-12-14 Airbus Operations (S.A.S.) DEVICE FOR PROTECTING THE LEAKS OF A CONNECTION OF A PIPELINE
CN111043425A (en) * 2019-12-25 2020-04-21 杭州曼京科技有限公司 Fire-fighting dual-purpose pipe joint

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2913091B1 (en) 2007-02-27 2010-09-17 Senior Automotive Blois Sas DEVICE FOR RECOVERING FUEL LEAKS ON THE SUPPLY TUBES OF AN INTERFACE.

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US5158114A (en) * 1987-11-20 1992-10-27 Carol M. Botsolas Specialized pipefitting cover for insulated Y-shaped joint
JP2000320426A (en) * 1999-05-14 2000-11-21 Usui Internatl Ind Co Ltd High pressure fuel injection pipe for diesel engine
DE20314164U1 (en) * 2003-09-11 2003-12-18 Meichelböck, Hubert Heat insulating case for heating shut off valve has two half shells hinged together to fit over valve

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Publication number Priority date Publication date Assignee Title
US5158114A (en) * 1987-11-20 1992-10-27 Carol M. Botsolas Specialized pipefitting cover for insulated Y-shaped joint
JP2000320426A (en) * 1999-05-14 2000-11-21 Usui Internatl Ind Co Ltd High pressure fuel injection pipe for diesel engine
DE20314164U1 (en) * 2003-09-11 2003-12-18 Meichelböck, Hubert Heat insulating case for heating shut off valve has two half shells hinged together to fit over valve

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1923563B1 (en) * 2006-11-18 2017-01-11 ElringKlinger AG Safety system and method of use
WO2008062045A1 (en) 2006-11-24 2008-05-29 Renault S.A.S Protection shell for liquid pipe connectors
FR2909158A1 (en) 2006-11-24 2008-05-30 Renault Sas PROTECTIVE SHELL FOR CONNECTIONS OF LIQUID PIPES.
WO2009123291A1 (en) 2008-04-02 2009-10-08 株式会社ニフコ Pipe joint cover
JP2009250064A (en) * 2008-04-02 2009-10-29 Nifco Inc Pipe joint cover
EP2261497A1 (en) * 2008-04-02 2010-12-15 Nifco Inc. Pipe joint cover
EP2261497A4 (en) * 2008-04-02 2011-05-18 Nifco Inc Pipe joint cover
KR101217360B1 (en) 2008-04-02 2012-12-31 가부시키가이샤 니프코 pipe joint cover
FR3067441A1 (en) * 2017-06-12 2018-12-14 Airbus Operations (S.A.S.) DEVICE FOR PROTECTING THE LEAKS OF A CONNECTION OF A PIPELINE
CN111043425A (en) * 2019-12-25 2020-04-21 杭州曼京科技有限公司 Fire-fighting dual-purpose pipe joint

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