EP1019627B1 - Jet pump comprising a jet with variable cross-section - Google Patents

Jet pump comprising a jet with variable cross-section Download PDF

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Publication number
EP1019627B1
EP1019627B1 EP98946524A EP98946524A EP1019627B1 EP 1019627 B1 EP1019627 B1 EP 1019627B1 EP 98946524 A EP98946524 A EP 98946524A EP 98946524 A EP98946524 A EP 98946524A EP 1019627 B1 EP1019627 B1 EP 1019627B1
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EP
European Patent Office
Prior art keywords
core
fact
pump according
nozzle
pump
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.)
Expired - Lifetime
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EP98946524A
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German (de)
French (fr)
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EP1019627A1 (en
Inventor
Bruno Sertier
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Marwal Systems SAS
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Marwal Systems SAS
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Publication date
Priority claimed from FR9712206A external-priority patent/FR2769053B1/en
Application filed by Marwal Systems SAS filed Critical Marwal Systems SAS
Publication of EP1019627A1 publication Critical patent/EP1019627A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/48—Control
    • F04F5/52—Control of evacuating pumps
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/02—Feeding by means of suction apparatus, e.g. by air flow through carburettors
    • F02M37/025—Feeding by means of a liquid fuel-driven jet pump

Definitions

  • the present invention relates to the field of jet pumps.
  • the present invention finds in particular, but not exclusively, application in the field of tanks motor vehicle fuel.
  • the present invention can find application in fuel transfer between different pockets for fuel tanks multipockets, or for filling a reserve bowl which draws a fuel pump or any other fuel supply device.
  • suction devices from jet pump fuel are shown in the documents DE-A-3 915 185, DE-A-3 612 194 or DE-A-2 602 234.
  • document DE-A-4 201 037 proposes to arrange inside the nozzle, in upstream of the outlet nozzle thereof, a plunger core carried by a spring-loaded membrane, so that the plunger retreats in the event of an increase in pressure to increase the free section of the nozzle of the nozzle.
  • document DE-A-4 201 037 proposes to make the very body of the nozzle in the form of a deformable element with respect to a plunger core fixed again to adapt the outlet section of the nozzle at the injected pressure.
  • Document DE-U-9101313 describes a jet pump for transferring fuel to a fuel tank motor vehicle fuel comprising a cap of conical shape mounted with displacement opposite the main nozzle outlet nozzle and downstream of it.
  • the present invention now aims to offer a new and improved jet pump.
  • the core is provided with a channel longitudinal through forming an auxiliary nozzle.
  • the operation of this alternative embodiment will described later.
  • FIG. 1 a pump to jet according to the present invention comprising a cylinder housing 10 centered on a longitudinal axis O-O.
  • This box 10 defines a control input 12 receiving the injected flow, at a first end axial.
  • the axial output 14 of the pump is defined at the opposite axial end.
  • the housing 10 also has an input suction aid 16 which communicates laterally with the internal channel 18 of the housing 10.
  • This auxiliary suction input 16 is located near the control input 12. It can be formed by tubing inclined with respect to the axis O-O of the case, for example from an angle included between 10 ° and 90 °.
  • the housing 10 has at the entrance 12 a sprinkler 20. Thereafter this sprinkler 20 will be called “main” nozzle. It can be a sprinkler reported on input 12 as illustrated in FIG. 1, or a sprinkler integrated by manufacturing into the housing 10 or a section of the housing 10. Of course, a sealing must be defined between the inlet of the nozzle 20 and the input 12 of the housing 10.
  • the nozzle 20 is composed of two sections 22, 24 axially juxtaposed.
  • the first section 22 in the flow direction is preferably of frustoconical convergent shape.
  • the half angle at the top of this section 22 is preferably between 10 ° and 80 °.
  • the second section 24 of the nozzle 20 is cylindrical preference of revolution and cross-section constant.
  • the free outer end 240 of this section 24 is preferably slightly rounded. We will describe by the following with regard to FIGS. 6 to 9 different modes of realization of such a nozzle end.
  • the section right of section 180 of channel 18 formed in the housing 10 is preferably cylindrical of revolution and constant dimension.
  • a core 30 is disposed opposite the nozzle outlet nozzle 20, being guided translation, along the O-O axis, against stress a spring 40.
  • the core 30 can be guided along the axis O-O by many appropriate means.
  • the core 30 is provided with a channel central internal blind 32 opening at its end rear opposite the nozzle 20. Furthermore, the core 30 is engaged, by this channel 32, on a rod 50 centered in channel 18 and connected to housing 10. As an example not limiting, this rod 50 can thus be supported on the internal surface of the housing 10, in the channel of this one, by three fins 52 equi-distributed at 120 ° around the axis 0-0.
  • This rod 50 has most of its length a cylindrical section of constant dimension complementary to the cross section of channel 32 formed in the core 30. However, the rod 50 has preferably a tapered tapered rear section 54 or converge away from the nozzle 20.
  • the front face 56 of the rod 50 is preferably plane and orthogonal to the O-O axis.
  • the face rear 58 of rod 50 is preferably rounded or conical.
  • the fins 52 are connected to the part cylindrical of the rod 50, immediately upstream of the transition zone towards the tapered section 54.
  • the core 30 has an envelope generally cylindrical outer of revolution and constant section.
  • the core 30 however has a front section frustoconical 34 terminated by a front end generally in hemisphere or in warhead 36.
  • the nucleus 30 also has a tapered rear section 38.
  • the spring 40 is advantageously a spring of helical compression arranged in the channel 32 of the core 30 between the front face 56 of the rod 50 and the bottom of the channel 32.
  • the spring 40 urges the core 30 to bear against the nozzle of the nozzle 20, more precisely against the rear surface 240 of section 24 or on a generator contact.
  • the core 30 thus preferably rests against the free end 240 of the section 24, in the form of a zone limited substantially to a circular edge or on a contact generator defined at the zone level transition between the tapered section 34 divergent and the front end in hemisphere 36.
  • the channel 18 formed in the housing 10 can have a section 181 converging towards exit 14, itself followed by a straight section 182 constant cylindrical.
  • the length of the converging section 181 is advantageously equal to the length of the divergent section 34 of the core 30.
  • the core 30 is advantageously guided along the axis O-O, at its cylindrical section of revolution, by guide studs 17, for example three guiding studs evenly distributed at 120 °. These are from preferably arranged in the extension of the fins 52.
  • the contact area defined between the front end of the core 30 and the outlet nozzle of the nozzle 20 has a limited amplitude.
  • the internal surface 202 and the external surface 204 of the section 24 of the nozzle 20 are cylindrical of revolution around the axis O-O, and the end 240 of the nozzle 20 is formed of a cap 208 O-ring, i.e. delimited in cross section by a circular sector, which connects tangentially on the external surface 204 and which joins the surface internal 202 at a circular edge 206, which edge 206 defines the contact at rest with the core 30.
  • the angle defined between the toric cap 208 and the internal surface 202, at the connection between these can be the subject of various variants. he is typically of the order of 90 °.
  • the second embodiment of the end 240 of nozzle 20 illustrated in FIG. 7 is distinguished from that illustrated in FIG. 6 and previously described, by the fact that the toric cap 208 does not connect on the internal surface 202 in the form of an edge 206 circular, but connects tangentially to a second O-ring surface 210, radially internal, which itself connects tangentially to the surface internal 202.
  • the contact at rest between the core 30 and the nozzle 20 is thus defined at this surface toric 210.
  • the second toric surface 210, radially internal has a radius of curvature less than that of the O-ring surface 208 radially external.
  • the radius of the surface radially external toroidal 208 is of the order of 1 to 2 mm, while the radius of the toric surface 210 radially internal is of the order of 0.05 to 0.5 mm.
  • FIG. 8 variant A third is illustrated in FIG. 8 variant according to which a flat surface in crown 212, or if necessary of frustoconical shape, is interposed between the two toric surfaces 208 and 212.
  • Figure 9 a fourth variant which differs from that illustrated in Figure 8 by the fact that the surface O-ring 208 radially external is replaced by a chamfer or frustoconical surface 214.
  • end 240 of the nozzle 20 can be the subject of many other variations of production.
  • the jet pump architecture conforms to the present invention avoids any valve of discharge upstream of the nozzle 20.
  • the present invention avoids any loss of return flow, in the form external discharge, so that the injected flow Qi is permanently equal to the return flow.
  • the section ejection i.e. the free section of the nozzle 20 is reduced and increases the transmitted power to the jet pump by a high injection pressure Pi.
  • the core 30 recedes by compression of the spring 40, with respect to the nozzle 20 which increases the section of passage at the outlet of the nozzle and to limit the back pressure upstream of the nozzle 20 at an acceptable level.
  • the flow of the flow leaving the nozzle 20 takes the form of a conical film channeled by the converge on the annular mixer.
  • the angle of taper of the section 34 of the core is of the order of 8 °
  • of the section 38 of the core is of the order of 9 °
  • of section 181 of channel 18 is of the order of 5 °
  • of section 54 of the rod 50 is of the order of 6 °.
  • This channel 300 can be the subject of various variants.
  • the channel 300 is formed of three sections successive, 302, 304, 306, which follow one another from nozzle 20, towards the pump outlet.
  • the first section 302 is cylindrical with revolution and constant section. He's stretching typically over 4/5 of the length of the core 30.
  • the second section 304 is converging in the direction from the pump outlet.
  • the third section 306 is cylindrical revolution and at least substantially constant section.
  • the outlet diameter of the channel 300, or the outlet diameter of section 306 (which auxiliary nozzle) is between 0.4 and 1mm.
  • the core 30 is guided in translation opposite the nozzle outlet 20 and biased towards this outlet by a spring 40.
  • the core 30 can be guided in translation by all appropriate means. According to the embodiment no limitative illustrated in FIGS. 10 to 12, provision is made for this purpose on the internal surface of the housing 10, longitudinal fins 310, for example three fins 310 distributed at 120 °, which in combination define a additional free internal volume of the envelope of the core 30. As a variant, the fins 310 secured to the core 30.
  • the spring 40 can take various configurations.
  • it is formed of a spiral spring which is supported on the one hand on a recess of the core 30, on the other hand on the upstream end of fins 110 integral with the internal wall of the housing 10, for example three fins 110 distributed at 120 °.
  • FIGS. 10 to 12 increase suction performance of the very low flow annular jet pump injected (typically for flow rates below 20 l / h) while limiting the back pressure (or injection pressure) to maximum return flow.
  • FIG. 14 a variant with double flow in which the core 30 provided with a longitudinal through channel 300, rests on the outlet of the nozzle 20 via a bearing surface of hemispherical or semi-toroidal geometry (while the bearing surface of the core 30 is generally frustoconical according to Figures 10 to 12); and in FIG. 13, an alternative embodiment which is not distinguishes from figure 14 that by the fact that the channel 300 is obstructed. So the embodiment of the figure 13 corresponds to a simple flow.
  • the core 30 is guided by fins 310 as described with reference to FIGS. 10 to 12; and the spring 40 is supported between the core 30 and fins 110 integral with the housing 10.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Special Spraying Apparatus (AREA)

Description

La présente invention concerne le domaine des pompes à jet.The present invention relates to the field of jet pumps.

La présente invention trouve notamment, mais non exclusivement, application dans le domaine des réservoirs de carburant de véhicules automobiles.The present invention finds in particular, but not exclusively, application in the field of tanks motor vehicle fuel.

Plus précisément encore la présente invention peut trouver application dans le transfert de carburant entre différentes poches pour réservoirs de carburant multipoches, ou pour le remplissage d'un bol de réserve dans lequel puise une pompe de carburant ou tout autre dispositif d'alimentation de carburant.Even more precisely the present invention can find application in fuel transfer between different pockets for fuel tanks multipockets, or for filling a reserve bowl which draws a fuel pump or any other fuel supply device.

Des exemples de dispositifs d'aspiration de carburant à base de pompe à jet sont illustrés dans les documents DE-A-3 915 185, DE-A-3 612 194 ou DE-A-2 602 234.Examples of suction devices from jet pump fuel are shown in the documents DE-A-3 915 185, DE-A-3 612 194 or DE-A-2 602 234.

Bien qu'ayant déjà rendu de grands services, les dispositifs d'aspiration à base de pompe à jet connus ne donnent cependant pas toujours satisfaction.Although they have already rendered great services, known jet pump-based suction devices do not do not always give satisfaction.

En particulier il a été constaté que le débit injecté dans la pompe à jet, correspondant à un retour de carburant en provenance du moteur, ou encore à une dérivation de carburant prélevée en sortie de pompe, présente parfois des fluctuations de pression et/ou de débits importantes de sorte qu'il est difficile d'adapter les caractéristiques de la pompe à jet, et notamment d'éviter l'apparition de contre-pressions importantes, en entrée de la pompe à jet, si la section du gicleur de sortie est trop étroite pour le débit et/ou pression injecté.In particular, it was found that the flow injected into the jet pump, corresponding to a return of fuel from the engine, or to a fuel bypass taken from the pump outlet, sometimes has pressure and / or pressure fluctuations large flows so it is difficult to adapt the characteristics of the jet pump, and in particular avoid the appearance of significant back pressures, by jet pump inlet, if the jet section of outlet is too narrow for flow and / or pressure injected.

Diverses propositions ont été formulées pour tenter d'éliminer cet inconvénient.Various proposals have been made for try to eliminate this drawback.

Ainsi on a par exemple proposé dans le document DE-A-4 201 037 de disposer à l'intérieur du gicleur, en amont de la buse de sortie de celui-ci, un noyau plongeur porté par une membrane sollicitée par ressort, de sorte que le noyau plongeur recule en cas d'augmentation de pression pour augmenter la section libre de la buse du gicleur. Selon une variante, le document DE-A-4 201 037 propose de réaliser le corps même du gicleur sous forme d'un élément déformable par rapport à un noyau plongeur fixe pour adapter là encore la section de sortie de la buse à la pression injectée.So, for example, we proposed in the document DE-A-4 201 037 to arrange inside the nozzle, in upstream of the outlet nozzle thereof, a plunger core carried by a spring-loaded membrane, so that the plunger retreats in the event of an increase in pressure to increase the free section of the nozzle of the nozzle. According to a variant, document DE-A-4 201 037 proposes to make the very body of the nozzle in the form of a deformable element with respect to a plunger core fixed again to adapt the outlet section of the nozzle at the injected pressure.

La Demanderesse a elle-même proposé dans sa demande de brevet français N° 96 11739 déposée le 26 Septembre 1996 une pompe à jet dans laquelle le gicleur qui reçoit le débit injecté est formé d'une buse composée de plusieurs lèvres en matériau élastique adaptées de sorte que la buse présente une section variable selon la pression et le débit injecté.The Applicant has itself proposed in its French patent application N ° 96 11739 filed on 26 September 1996 a jet pump in which the nozzle which receives the injected flow is formed by a compound nozzle of several lips of elastic material adapted from so that the nozzle has a variable section depending on the pressure and flow injected.

Le document DE-U-9101313 décrit une pompe à jet pour le transfert de carburant dans un réservoir de carburant de véhicule automobile comprenant une calotte de forme conique montée à déplacement en regard de la buse de sortie du gicleur principal et en aval de celle-ci.Document DE-U-9101313 describes a jet pump for transferring fuel to a fuel tank motor vehicle fuel comprising a cap of conical shape mounted with displacement opposite the main nozzle outlet nozzle and downstream of it.

D'autres solutions connues consistent à disposer, en amont du gicleur ou de l'entrée de débit injecté de la pompe à jet, un clapet de décharge susceptible de s'ouvrir lorsque la pression injectée dépasse un seuil de tarage du clapet. Ces solutions présentent cependant l'inconvénient de perdre une partie du fluide, en dérive par le clapet, de sorte que cette partie de fluide n'est pas injectée dans le gicleur.Other known solutions consist in having, upstream of the nozzle or of the flow input injected from the jet pump, a relief valve capable of open when the injected pressure exceeds a threshold of valve calibration. However, these solutions the inconvenience of losing part of the fluid, in drift by the valve, so that this part of fluid is not not injected into the nozzle.

La présente invention a maintenant pour but de proposer une nouvelle pompe à jet perfectionnée.The present invention now aims to offer a new and improved jet pump.

Ce but est atteint dans le cadre de la présente invention grâce à une pompe à jet du type défini en revendication 1 annexée.This goal is achieved in the context of this invention by means of a jet pump of the type defined in claim 1 appended.

Selon une variante de réalisation conforme à la présente invention, le noyau est muni d'un canal longitudinal traversant formant un gicleur auxiliaire. Le fonctionnement de cette variante de réalisation sera décrit par la suite.According to an alternative embodiment in accordance with the present invention, the core is provided with a channel longitudinal through forming an auxiliary nozzle. The operation of this alternative embodiment will described later.

D'autres caractéristiques, buts et avantages de la présente invention apparaítront à la lecture de la description détaillée qui va suivre, et en regard des dessins annexés, donnés à titre d'exemples non limitatifs et sur lesquels :

  • la figure 1 représente une vue schématique en coupe longitudinale d'une pompe à jet conforme à un mode de réalisation de la présente invention,
  • les figures 2 et 3 représentent des vues schématiques en coupe transversale de la même pompe selon des plans de coupe référencés II et III sur la figure 1,
  • la figure 4 représente une vue de la même pompe en position ouverte du gicleur,
  • la figure 5 représente une vue en coupe longitudinale d'une pompe conforme à une variante de réalisation de la présente invention, en position fermée,
  • les figures 6 à 9 représentent quatre variantes de réalisation d'une extrémité de gicleur conforme à la présente invention,
  • la figure 10 représente une vue schématique en coupe longitudinale d'une pompe à jet conforme à une variante de réalisation de la présente invention,
  • les figures 11 et 12 représentent la même variante pour deux débits différents injectés dans la pompe, et
  • les figures 13 et 14 représentent des vues en coupe longitudinale de deux autres variantes de réalisation conformes à la présente invention.
Other characteristics, aims and advantages of the present invention will appear on reading the detailed description which follows, and with reference to the appended drawings, given by way of nonlimiting examples and in which:
  • FIG. 1 represents a schematic view in longitudinal section of a jet pump according to an embodiment of the present invention,
  • FIGS. 2 and 3 represent schematic cross-sectional views of the same pump according to cutting planes referenced II and III in FIG. 1,
  • FIG. 4 represents a view of the same pump in the open position of the nozzle,
  • FIG. 5 represents a view in longitudinal section of a pump according to an alternative embodiment of the present invention, in the closed position,
  • FIGS. 6 to 9 show four alternative embodiments of a nozzle end according to the present invention,
  • FIG. 10 represents a schematic view in longitudinal section of a jet pump according to an alternative embodiment of the present invention,
  • FIGS. 11 and 12 show the same variant for two different flow rates injected into the pump, and
  • Figures 13 and 14 show views in longitudinal section of two other alternative embodiments according to the present invention.

On aperçoit sur la figure 1 annexée une pompe à jet conforme à la présente invention comprenant un boítier cylindre 10 centré sur un axe longitudinal O-O.We can see in Figure 1 attached a pump to jet according to the present invention comprising a cylinder housing 10 centered on a longitudinal axis O-O.

Ce boítier 10 définit une entrée de commande 12 recevant le débit injecté, à une première extrémité axiale. This box 10 defines a control input 12 receiving the injected flow, at a first end axial.

La sortie axiale 14 de la pompe est définie à l'extrémité axiale opposée.The axial output 14 of the pump is defined at the opposite axial end.

Le boítier 10 possède en outre une entrée auxiliaire d'aspiration 16 qui communique latéralement avec le canal interne 18 du boítier 10.The housing 10 also has an input suction aid 16 which communicates laterally with the internal channel 18 of the housing 10.

Cette entrée auxiliaire d'aspiration 16 est disposée à proximité de l'entrée de commande 12. Elle peut être formée d'une tubulure inclinée par rapport à l'axe O-O du boítier, par exemple d'un angle compris entre 10° et 90°.This auxiliary suction input 16 is located near the control input 12. It can be formed by tubing inclined with respect to the axis O-O of the case, for example from an angle included between 10 ° and 90 °.

Le boítier 10 possède au niveau de l'entrée 12 un gicleur 20. Par la suite ce gicleur 20 sera dénommé gicleur « principal ». Il peut s'agir d'un gicleur rapporté sur l'entrée 12 comme illustré sur la figure 1, ou encore d'un gicleur intégré par fabrication au boítier 10 ou à un tronçon du boítier 10. Bien entendu, une étanchéité doit être définie entre l'entrée du gicleur 20 et l'entrée 12 du boítier 10.The housing 10 has at the entrance 12 a sprinkler 20. Thereafter this sprinkler 20 will be called "main" nozzle. It can be a sprinkler reported on input 12 as illustrated in FIG. 1, or a sprinkler integrated by manufacturing into the housing 10 or a section of the housing 10. Of course, a sealing must be defined between the inlet of the nozzle 20 and the input 12 of the housing 10.

Plus précisément encore, selon le mode de réalisation préférentiel illustré sur les figures annexées, le gicleur 20 est composé de deux tronçons 22, 24 juxtaposés axialement.More precisely still, according to the mode of preferred embodiment illustrated in the figures annexed, the nozzle 20 is composed of two sections 22, 24 axially juxtaposed.

Le premier tronçon 22 dans le sens d'écoulement est de préférence de forme tronconique convergente. Le demi angle au sommet de ce tronçon 22 est de préférence compris entre 10° et 80°.The first section 22 in the flow direction is preferably of frustoconical convergent shape. The half angle at the top of this section 22 is preferably between 10 ° and 80 °.

Le second tronçon 24 du gicleur 20 est de préférence cylindrique de révolution et de section constante. L'extrémité extérieure libre 240 de ce tronçon 24 est de préférence légèrement arrondie. On décrira par la suite en regard des figures 6 à 9 différents modes de réalisation d'une telle extrémité de gicleur.The second section 24 of the nozzle 20 is cylindrical preference of revolution and cross-section constant. The free outer end 240 of this section 24 is preferably slightly rounded. We will describe by the following with regard to FIGS. 6 to 9 different modes of realization of such a nozzle end.

Sur la longueur axiale du gicleur 20, la section droite du tronçon 180 du canal 18 formée dans le boítier 10 est de préférence cylindrique de révolution et de dimension constante. On the axial length of the nozzle 20, the section right of section 180 of channel 18 formed in the housing 10 is preferably cylindrical of revolution and constant dimension.

Comme indiqué précédemment, dans le cadre de la présente invention, un noyau 30 est disposé en regard de la buse de sortie du gicleur 20, en étant guidé à translation, selon l'axe O-O, contre la sollicitation d'un ressort 40.As previously stated, as part of the present invention, a core 30 is disposed opposite the nozzle outlet nozzle 20, being guided translation, along the O-O axis, against stress a spring 40.

Le noyau 30 peut être guidé selon l'axe O-O par de nombreux moyens appropriés.The core 30 can be guided along the axis O-O by many appropriate means.

De préférence, le noyau 30 est muni d'un canal borgne interne central 32 débouchant sur son extrémité arrière opposée au gicleur 20. Par ailleurs, le noyau 30 est engagé, par ce canal 32, sur une tige 50 centrée dans le canal 18 et reliée au boítier 10. A titre d'exemple non limitatif, cette tige 50 peut ainsi être supportée sur la surface interne du boítier 10, dans le canal de celui-ci, par trois ailettes 52 équi-réparties à 120° autour de l'axe 0-0.Preferably, the core 30 is provided with a channel central internal blind 32 opening at its end rear opposite the nozzle 20. Furthermore, the core 30 is engaged, by this channel 32, on a rod 50 centered in channel 18 and connected to housing 10. As an example not limiting, this rod 50 can thus be supported on the internal surface of the housing 10, in the channel of this one, by three fins 52 equi-distributed at 120 ° around the axis 0-0.

Cette tige 50 présente sur l'essentiel de sa longueur une section cylindrique de dimension constante complémentaire de la section droite du canal 32 formée dans le noyau 30. Cependant, la tige 50 possède de préférence un tronçon arrière 54 tronconique effilé ou convergent en éloignement du gicleur 20.This rod 50 has most of its length a cylindrical section of constant dimension complementary to the cross section of channel 32 formed in the core 30. However, the rod 50 has preferably a tapered tapered rear section 54 or converge away from the nozzle 20.

La face avant 56 de la tige 50 est de préférence plane et orthogonale à l'axe O-O. Par contre, la face arrière 58 de la tige 50 est de préférence arrondie ou conique.The front face 56 of the rod 50 is preferably plane and orthogonal to the O-O axis. However, the face rear 58 of rod 50 is preferably rounded or conical.

Les ailettes 52 se raccordent sur la partie cylindrique de la tige 50, immédiatement en amont de la zone de transition vers le tronçon effilé 54.The fins 52 are connected to the part cylindrical of the rod 50, immediately upstream of the transition zone towards the tapered section 54.

Le noyau 30 possède quant à lui une enveloppe extérieure généralement cylindrique de révolution et de section constante.The core 30 has an envelope generally cylindrical outer of revolution and constant section.

Le noyau 30 possède cependant un tronçon avant tronconique 34 terminé par une extrémité avant généralement en hémisphère ou en ogive 36. Le noyau 30 possède également un tronçon arrière 38 tronconique. The core 30 however has a front section frustoconical 34 terminated by a front end generally in hemisphere or in warhead 36. The nucleus 30 also has a tapered rear section 38.

Le ressort 40 est avantageusement un ressort de compression hélicoïdal disposé dans le canal 32 du noyau 30 entre la face avant 56 de la tige 50 et le fond du canal 32.The spring 40 is advantageously a spring of helical compression arranged in the channel 32 of the core 30 between the front face 56 of the rod 50 and the bottom of the channel 32.

Ainsi l'Homme de l'art comprendra aisément que le ressort 40 sollicite le noyau 30 en appui contre la buse de sortie du gicleur 20, plus précisément contre la surface arrière 240 du tronçon 24 ou sur une génératrice de contact de celle-ci.Thus those skilled in the art will readily understand that the spring 40 urges the core 30 to bear against the nozzle of the nozzle 20, more precisely against the rear surface 240 of section 24 or on a generator contact.

Le noyau 30 repose ainsi de préférence contre l'extrémité libre 240 du tronçon 24, sous forme d'une zone limitée sensiblement à une arête circulaire ou sur une génératrice de contact définie au niveau de la zone de transition entre le tronçon tronconique 34 divergent et l'extrémité avant en hémisphère 36.The core 30 thus preferably rests against the free end 240 of the section 24, in the form of a zone limited substantially to a circular edge or on a contact generator defined at the zone level transition between the tapered section 34 divergent and the front end in hemisphere 36.

En aval du tronçon initial 180 de section droite constante dont la longueur coïncide avec la longueur du gicleur 20, le canal 18 formé dans le boítier 10 peut posséder un tronçon 181 convergent vers la sortie 14, lui-même suivi d'un tronçon 182 de section droite cylindrique constante.Downstream from the initial straight section 180 constant whose length coincides with the length of the nozzle 20, the channel 18 formed in the housing 10 can have a section 181 converging towards exit 14, itself followed by a straight section 182 constant cylindrical.

La longueur du tronçon 181 convergent est avantageusement égale à la longueur du tronçon divergent 34 du noyau 30.The length of the converging section 181 is advantageously equal to the length of the divergent section 34 of the core 30.

Enfin, comme on le voit à l'examen des figures 1 et 3, le noyau 30 est avantageusement guidé selon l'axe O-O, au niveau de son tronçon cylindrique de révolution, par des gaudrons de guidage 17, par exemple trois gaudrons de guidage équi-répartis à 120°. Ceux-ci sont de préférence disposés dans le prolongement des ailettes 52 .Finally, as seen on examining Figures 1 and 3, the core 30 is advantageously guided along the axis O-O, at its cylindrical section of revolution, by guide studs 17, for example three guiding studs evenly distributed at 120 °. These are from preferably arranged in the extension of the fins 52.

Il est important de noter que dans le cadre de la présente invention la zone de contact définie entre l'extrémité avant du noyau 30 et la buse de sortie du gicleur 20 présente une amplitude limitée. It is important to note that as part of the present invention the contact area defined between the front end of the core 30 and the outlet nozzle of the nozzle 20 has a limited amplitude.

On a illustré sur la figure 6 une première variante de réalisation d'extrémité 240 de gicleur 20. Selon cette première variante, la surface interne 202 et la surface externe 204 du tronçon 24 du gicleur 20 sont cylindriques de révolution autour de l'axe O-O, et l'extrémité 240 du gicleur 20 est formée d'une calotte 208 torique, c'est à dire délimitée en section droite par un secteur circulaire, qui se raccorde tangentiellement sur la surface externe 204 et qui rejoint la surface interne 202 au niveau d'une arête circulaire 206, laquelle arête 206 définit le contact au repos avec le noyau 30. L'angle défini entre la calotte torique 208 et la surface interne 202, au niveau de la liaison entre celles-ci peut faire l'objet de diverses variantes. Il est typiquement de l'ordre de 90°.We illustrated in Figure 6 a first variant of the end 240 of the nozzle 20. According to this first variant, the internal surface 202 and the external surface 204 of the section 24 of the nozzle 20 are cylindrical of revolution around the axis O-O, and the end 240 of the nozzle 20 is formed of a cap 208 O-ring, i.e. delimited in cross section by a circular sector, which connects tangentially on the external surface 204 and which joins the surface internal 202 at a circular edge 206, which edge 206 defines the contact at rest with the core 30. The angle defined between the toric cap 208 and the internal surface 202, at the connection between these can be the subject of various variants. he is typically of the order of 90 °.

Le deuxième mode de réalisation de l'extrémité 240 de gicleur 20 illustré sur la figure 7 se distingue de celui illustré sur la figure 6 et précédemment décrit, par le fait que la calotte torique 208 ne se raccorde pas sur la surface interne 202 sous forme d'une arête 206 circulaire, mais se raccorde tangentiellement sur une seconde surface torique 210, radialement interne, qui elle même se raccorde tangentiellement sur la surface interne 202. Le contact au repos entre le noyau 30 et la buse 20 est ainsi défini au niveau de cette surface torique 210. La seconde surface torique 210, radialement interne, a un rayon de courbure inférieure à celui de la surface torique 208 radialement externe. De façon typique, mais non limitative, le rayon de la surface torique 208 radialement externe est de l'ordre de 1 à 2 mm, tandis que le rayon de la surface torique 210 radialement interne est de l'ordre de 0,05 à 0,5 mm.The second embodiment of the end 240 of nozzle 20 illustrated in FIG. 7 is distinguished from that illustrated in FIG. 6 and previously described, by the fact that the toric cap 208 does not connect on the internal surface 202 in the form of an edge 206 circular, but connects tangentially to a second O-ring surface 210, radially internal, which itself connects tangentially to the surface internal 202. The contact at rest between the core 30 and the nozzle 20 is thus defined at this surface toric 210. The second toric surface 210, radially internal, has a radius of curvature less than that of the O-ring surface 208 radially external. In a way typical, but not limiting, the radius of the surface radially external toroidal 208 is of the order of 1 to 2 mm, while the radius of the toric surface 210 radially internal is of the order of 0.05 to 0.5 mm.

On a illustré sur la figure 8 une troisième variante de réalisation selon laquelle une surface plane en couronne 212, ou le cas échéant de forme tronconique, est intercalée entre les deux surfaces toriques 208 et 212.A third is illustrated in FIG. 8 variant according to which a flat surface in crown 212, or if necessary of frustoconical shape, is interposed between the two toric surfaces 208 and 212.

Enfin on a illustré sur la figure 9 une quatrième variante de réalisation qui se distingue de celle illustrée sur la figure 8 par le fait que la surface torique 208 radialement externe est remplacée par un chanfrein ou surface tronconique 214.Finally we illustrated in Figure 9 a fourth variant which differs from that illustrated in Figure 8 by the fact that the surface O-ring 208 radially external is replaced by a chamfer or frustoconical surface 214.

Bien entendu l'extrémité 240 du gicleur 20 peut faire l'objet de nombreuses autres variantes de réalisation.Of course the end 240 of the nozzle 20 can be the subject of many other variations of production.

Ainsi on peut envisager de raccorder directement le chanfrein 214 sur la surface torique radialement interne 210. Ou encore on peut remplacer la surface torique 208 par une surface annulaire dont la génératrice en section droite possède un rayon progressivement croissant vers l'extérieur.So we can consider connecting directly the chamfer 214 on the radially toroidal surface internal 210. Or you can replace the surface toric 208 by an annular surface whose generator in cross section has a radius gradually growing outward.

L'architecture de pompe à jet conforme à la présente invention permet d'éviter tout clapet de décharge en amont du gicleur 20. Ainsi, la présente invention évite toute perte du débit retour, sous forme de décharge externe, de sorte que le débit injecté Qi est en permanence égal au débit de retour.The jet pump architecture conforms to the present invention avoids any valve of discharge upstream of the nozzle 20. Thus, the present invention avoids any loss of return flow, in the form external discharge, so that the injected flow Qi is permanently equal to the return flow.

Pour les plus faibles débits injectés, la section d'éjection, c'est-à-dire la section libre du gicleur 20 est réduite et permet d'augmenter la puissance transmise à la pompe à jet par une pression d'injection Pi élevée.For the lowest injected flows, the section ejection, i.e. the free section of the nozzle 20 is reduced and increases the transmitted power to the jet pump by a high injection pressure Pi.

Pour des débits de retour élevés, le noyau 30 recule par compression du ressort 40, par rapport au gicleur 20 ce qui permet d'augmenter la section de passage en sortie du gicleur et de limiter la contre-pression en amont du gicleur 20 à un niveau acceptable.For high return flows, the core 30 recedes by compression of the spring 40, with respect to the nozzle 20 which increases the section of passage at the outlet of the nozzle and to limit the back pressure upstream of the nozzle 20 at an acceptable level.

L'utilisation d'un noyau Venturi 30 translatant en aval du gicleur 20 permet ainsi de garantir une efficacité de pompe à jet optimale pour les plus faibles débits injectés Qi (par réduction du diamètre de gicleur 20 et augmentation de la vitesse d'injection). The use of a translating Venturi 30 core downstream of the nozzle 20 thus makes it possible to guarantee a optimal jet pump efficiency for the weakest injected flow rates Qi (by reducing the nozzle diameter 20 and increased injection speed).

L'écoulement du débit en sortie du gicleur 20 s'effectue sous forme d'un film conique canalisé par le convergent vers le mélangeur annulaire.The flow of the flow leaving the nozzle 20 takes the form of a conical film channeled by the converge on the annular mixer.

A titre d'exemple non limitatif, l'angle de conicité du tronçon 34 du noyau est de l'ordre de 8°, du tronçon 38 du noyau est de l'ordre de 9°, du tronçon 181 du canal 18 est de l'ordre de 5° et du tronçon 54 de la tige 50 est de l'ordre de 6°.By way of nonlimiting example, the angle of taper of the section 34 of the core is of the order of 8 °, of the section 38 of the core is of the order of 9 °, of section 181 of channel 18 is of the order of 5 ° and of section 54 of the rod 50 is of the order of 6 °.

On a illustré sur la figure 5 annexée une variante de réalisation qui ne sera pas décrite dans les détails, et qui se distingue essentiellement du mode de réalisation précédemment décrit par le fait que l'élément de noyau 30 sollicité par le ressort 40 en regard de la buse de sortie du gicleur 20, et en aval de celui-ci, est guidé à translation selon l'axe O-O, par la tige 50 liée au boítier 10, non pas à l'extérieur de cette tige, mais à l'intérieur de celle-ci, plus précisément dans un canal borgne 51 qui débouche sur la surface avant de cette tige 50.Is illustrated in Figure 5 attached a variant which will not be described in the details, and which differs essentially from the mode of realization previously described by the fact that the element of core 30 biased by spring 40 opposite the nozzle outlet nozzle 20, and downstream thereof, is guided in translation along the axis O-O, by the rod 50 linked to the housing 10, not outside of this rod, but inside it, more precisely in a channel blind 51 which opens onto the front surface of this rod 50.

On va maintenant décrire la variante de réalisation illustrée sur les figures 10 à 12 annexées.We will now describe the variant of embodiment illustrated in Figures 10 to 12 attached.

Cette variante se distingue essentiellement de celles précédemment décrites, par le fait que selon les figures 10 à 12, le noyau 30 est muni d'un canal longitudinal traversant 300. Celui-ci forme un gicleur auxiliaire dont le fonctionnement sera décrit par la suite.This variant is essentially distinguished from those previously described, by the fact that according to Figures 10 to 12, the core 30 is provided with a channel longitudinal through 300. This forms a nozzle auxiliary whose operation will be described by the after.

La géométrie de ce canal 300 peut faire l'objet de diverses variantes.The geometry of this channel 300 can be the subject of various variants.

Selon le mode de réalisation illustré sur les figures 10 à 12, le canal 300 est formé de trois tronçons successifs, 302, 304, 306, qui se succèdent à partir du gicleur 20, vers la sortie de la pompe.According to the embodiment illustrated in the Figures 10 to 12, the channel 300 is formed of three sections successive, 302, 304, 306, which follow one another from nozzle 20, towards the pump outlet.

Le premier tronçon 302 est cylindrique de révolution et de section constante. Il s'étend typiquement sur les 4/5 de la longueur du noyau 30. The first section 302 is cylindrical with revolution and constant section. He's stretching typically over 4/5 of the length of the core 30.

Le second tronçon 304 est convergent en direction de la sortie de la pompe.The second section 304 is converging in the direction from the pump outlet.

Le troisième tronçon 306 est cylindrique de révolution et de section au moins sensiblement constante.The third section 306 is cylindrical revolution and at least substantially constant section.

Typiquement le diamètre de sortie du canal 300, soit le diamètre de sortie du tronçon 306 (qui fait gicleur auxiliaire) est compris entre 0,4 et 1mm.Typically the outlet diameter of the channel 300, or the outlet diameter of section 306 (which auxiliary nozzle) is between 0.4 and 1mm.

Comme décrit précédemment pour les modes de réalisation illustrés sur les figures 1 à 9, le noyau 30 est guidé à translation en regard de la sortie du gicleur 20 et sollicité vers cette sortie par un ressort 40.As previously described for the modes of embodiment illustrated in Figures 1 to 9, the core 30 is guided in translation opposite the nozzle outlet 20 and biased towards this outlet by a spring 40.

Le noyau 30 peut être guidé à translation par tous moyens appropriés. Selon le mode de réalisation non limitatif illustré sur les figures 10 à 12, il est prévu à cet effet sur la surface interne du boítier 10, des ailettes longitudinales 310, par exemple trois ailettes 310 réparties à 120°, qui définissent en combinaison un volume interne libre complémentaire de l'enveloppe externe du noyau 30. En variante on peut rendre les ailettes 310 solidaires du noyau 30.The core 30 can be guided in translation by all appropriate means. According to the embodiment no limitative illustrated in FIGS. 10 to 12, provision is made for this purpose on the internal surface of the housing 10, longitudinal fins 310, for example three fins 310 distributed at 120 °, which in combination define a additional free internal volume of the envelope of the core 30. As a variant, the fins 310 secured to the core 30.

Bien entendu selon cette variante il est important d'utiliser des moyens de guidage qui ne perturbent ni le fonctionnement du gicleur auxiliaire 300 ni le flux susceptible de s'écouler entre la sortie du gicleur 20 et la surface externe du noyau 30, et par conséquent qui n'obturent pas ceux-ci.Of course according to this variant it is important to use guide means which do not disturb the operation of the auxiliary nozzle 300 nor the flow likely to flow between the outlet of the nozzle 20 and the outer surface of the core 30, and by therefore who do not get these.

Le ressort 40 peut prendre diverses configurations.The spring 40 can take various configurations.

Selon le mode de réalisation illustré sur les figures 10 à 12, il est formé d'un ressort spiral qui prend appui d'une part sur un décrochement du noyau 30, d'autre part sur l'extrémité amont d'ailettes 110 solidaires de la paroi interne du boítier 10, par exemple trois ailettes 110 réparties à 120°.According to the embodiment illustrated in the Figures 10 to 12, it is formed of a spiral spring which is supported on the one hand on a recess of the core 30, on the other hand on the upstream end of fins 110 integral with the internal wall of the housing 10, for example three fins 110 distributed at 120 °.

Les dispositions illustrées sur les figures 10 à 12 permettent d'augmenter les performances d'aspiration de la pompe à jet annulaire à très faible débit injecté (typiquement pour des débits inférieurs à 20 l/h) tout en limitant la contre-pression (ou pression d'injection) à débit retour maximal.The arrangements illustrated in FIGS. 10 to 12 increase suction performance of the very low flow annular jet pump injected (typically for flow rates below 20 l / h) while limiting the back pressure (or injection pressure) to maximum return flow.

Lorsque le débit dans l'entrée 12 est nul, il en est de même pour le débit dans l'entrée d'aspiration 16, et pour le débit à la sortie 14 (voir figure 10). Dans ce cas le noyau 30 repose sur l'extrémité du gicleur 20.When the flow in inlet 12 is zero, it the same is true for the flow in the suction inlet 16, and for the flow at outlet 14 (see Figure 10). In this in this case, the core 30 rests on the end of the nozzle 20.

Lorsque le débit Qi injecté dans l'entrée 12 est faible, la contre-pression Pi demeure en deçà du seuil de pression d'ouverture Ps du noyau 30 (fonction du tarage du ressort de compression 40), ce qui localise l'injection à travers le gicleur auxiliaire formé par le canal longitudinal 300 du noyau 30 (voir figure 11). L'effet Venturi est alors réalisé de façon classique et le débit transféré est collecté à travers le tube mélangeur situé en aval du noyau 30.When the flow Qi injected into inlet 12 is low, the back pressure Pi remains below the threshold of opening pressure Ps of the core 30 (function of the calibration compression spring 40), which locates injection through the auxiliary nozzle formed by the longitudinal channel 300 of the core 30 (see Figure 11). The Venturi effect is then achieved in a conventional manner and the transferred flow is collected through the tube mixer located downstream of the core 30.

Lorsque le débit Qi injecté dans l'entrée 12 augmente, la contre-pression passe au dessus du seuil de pression Ps et le noyau 30 recule progressivement par déformation du ressort 40, libérant une section de passage annulaire entre le noyau 30 et le gicleur 20, comme on l'a décrit précédemment en regard des figures 1 à 9. Cette décharge permet de limiter l'augmentation de pression au dessus, de Ps pour les forts débits injectés Qi, tout en garantissant un effet Venturi secondaire en sortie du gicleur 300, ce qui contribue à l'augmentation du débit Qa aspiré à travers l'entrée 16, après recul du noyau 30 (voir figure 12). On notera en particuler que l'on peut obtenir une pompe à jet annulaire simple flux, suivant l'architecture illustrée sur les figures 10 à 12, en obstruant le canal 300 formé dans le noyau 30.When the flow Qi injected into input 12 increases, the back pressure goes above the threshold pressure Ps and the nucleus 30 gradually recedes by deformation of the spring 40, freeing a section of annular passage between the core 30 and the nozzle 20, as described above with reference to Figures 1 to 9. This discharge limits the increase in pressure above, of Ps for the high flow rates injected Qi, while ensuring a secondary Venturi effect by sprinkler outlet 300, which contributes to the increase of the flow Qa sucked through the inlet 16, after the core 30 (see figure 12). It should be noted in particular that a single flow annular jet pump can be obtained, according to the architecture illustrated in FIGS. 10 to 12, in obstructing the channel 300 formed in the core 30.

On a ainsi illustré sur la figure 14, une variante de réalisation à double flux dans laquelle le noyau 30 muni d'un canal longitudinal traversant 300, repose sur la sortie du gicleur 20 par l'intermédiaire d'une surface d'appui de géométrie hémisphérique ou semi-toroïdale (alors que la surface d'appui du noyau 30 est globalement tronconique selon les figures 10 à 12) ; et sur la figure 13, une variante de réalisation qui ne se distingue de la figure 14 que par le fait que le canal 300 est obstrué. Ainsi le mode de réalisation de la figure 13 correspond à un simple flux. Dans les deux cas des figures 13 et 14, le noyau 30 est guidé par des ailettes 310 comme décrit en regard des figures 10 à 12 ; et le ressort 40 prend appui entre le noyau 30 et des ailettes 110 solidaires du boítier 10.There is thus illustrated in FIG. 14, a variant with double flow in which the core 30 provided with a longitudinal through channel 300, rests on the outlet of the nozzle 20 via a bearing surface of hemispherical or semi-toroidal geometry (while the bearing surface of the core 30 is generally frustoconical according to Figures 10 to 12); and in FIG. 13, an alternative embodiment which is not distinguishes from figure 14 that by the fact that the channel 300 is obstructed. So the embodiment of the figure 13 corresponds to a simple flow. In both cases Figures 13 and 14, the core 30 is guided by fins 310 as described with reference to FIGS. 10 to 12; and the spring 40 is supported between the core 30 and fins 110 integral with the housing 10.

Claims (20)

  1. A jet pump, in particular for transferring fuel in a motor vehicle fuel tank, the pump comprising a main nozzle (20) and a core (30) mounted to move relative to the outlet bore of the main nozzle (20) and downstream therefrom, the pump being characterized by the facts that, at rest, said core is formed of a core (30) in contact with the outlet bore of the main nozzle (20), and that the core (30) is of right section that increases going away from the outlet bore of the main nozzle (20).
  2. A pump according to claim 1, characterized by the fact that the core (30) is provided with a through longitudinal channel (300) forming an auxiliary nozzle (306).
  3. A pump according to claim 2, characterized by the fact that the outlet diameter of the through channel (300) lies in the range 0.4 mm to 1 mm.
  4. A pump according to any one of claims 1 to 3, characterized by the fact that the main nozzle (20) possesses a converging segment (22) followed by a segment of constant section (24).
  5. A pump according to any one of claims 1 to 4, characterized by the fact that the half-angle at the apex of the main nozzle (20) lies in the range 10° to 80°.
  6. A pump according to any one of claims 1 to 5, characterized by the fact that the end of the outlet bore of the main nozzle (20) is generally rounded in shape.
  7. A pump according to any one of claims 1 to 6, characterized by the fact that the core (30) possesses a generally frustoconical front segment (34) terminated by a front end (36) that is generally hemispherical or bullet-shaped.
  8. A pump according to claim 7, characterized by the fact that the cone angle of the front segment of the core (30) is about 8°.
  9. A pump according to any one of claims 1 to 8, characterized by the fact that the core (30) possesses a generally cylindrical envelope of constant section.
  10. A pump according to any one of claims 1 to 9, characterized by the fact that the core (30) possesses a rear segment (38) that converges going away from the main nozzle (20).
  11. A pump according to any one of claims 1 to 10, characterized by the fact that it includes a spring (40) interposed between the front end of a support (50) and the core (30).
  12. A pump according to any one of claims 1 to 11, characterized by the fact that the core is guided by support means associated with the inner wall of the housing (10) by radial fins (52).
  13. A pump according to any one of claims 1 to 12, characterized by the fact that the housing (10) of the pump defines an internal channel possessing a segment (181) that converges in the flow direction, and that is located in register with the diverging segment of the core (30).
  14. A pump according to claim 13, characterized by the fact that the length of the converging segment of the channel (18) formed inside the housing (10) is of the same order of magnitude as the length of the diverging segment (34) formed on the core (30).
  15. A pump according to any one of claims 1 to 14, characterized by the fact that the core (30) is guided inside the channel (18) of the housing (10) by radial splines (17) associated with the inner surface of the channel (18).
  16. A pump according to any one of claims 1 to 15, characterized by the fact that the contact defined between the core (30) and the outlet bore (24) of the main nozzle (20) is formed by a circular edge (206).
  17. A pump according to any one of claims 1 to 15, characterized by the fact that the contact defined between the core (30) and the outlet bore (24) of the main nozzle (20) is formed via a generally toroidal cap (210) of said outlet bore.
  18. A pump according to claim 17, characterized by the fact that the radius of said generally toroidal cap (210) lies in the range 0.05 mm to 0.5 mm.
  19. A pump according to claim 2, characterized by the fact that the longitudinal channel (300) in the core (30) has a converging segment (304).
  20. A fuel tank fitted with a jet pump in accordance with any one of claims 1 to 19.
EP98946524A 1997-10-01 1998-09-29 Jet pump comprising a jet with variable cross-section Expired - Lifetime EP1019627B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
FR9712206A FR2769053B1 (en) 1997-10-01 1997-10-01 JET PUMP COMPRISING A VARIABLE SECTION JET
FR9712206 1997-10-01
FR9806524A FR2769054B1 (en) 1997-10-01 1998-05-25 JET PUMP COMPRISING A VARIABLE SECTION JET
FR9806524 1998-05-25
PCT/FR1998/002083 WO1999017013A1 (en) 1997-10-01 1998-09-29 Jet pump comprising a jet with variable cross-section

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EP1019627A1 EP1019627A1 (en) 2000-07-19
EP1019627B1 true EP1019627B1 (en) 2003-05-14

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EP (1) EP1019627B1 (en)
JP (1) JP2001518594A (en)
AR (1) AR015461A1 (en)
BR (1) BR9812571A (en)
DE (1) DE69814654T2 (en)
FR (1) FR2769054B1 (en)
WO (1) WO1999017013A1 (en)

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Also Published As

Publication number Publication date
WO1999017013A1 (en) 1999-04-08
AR015461A1 (en) 2001-05-02
US6364625B1 (en) 2002-04-02
FR2769054A1 (en) 1999-04-02
FR2769054B1 (en) 2001-12-07
EP1019627A1 (en) 2000-07-19
DE69814654T2 (en) 2004-04-08
JP2001518594A (en) 2001-10-16
DE69814654D1 (en) 2003-06-18
BR9812571A (en) 2000-07-25

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