EP1019627A1 - Jet pump comprising a jet with variable cross-section - Google Patents

Jet pump comprising a jet with variable cross-section

Info

Publication number
EP1019627A1
EP1019627A1 EP98946524A EP98946524A EP1019627A1 EP 1019627 A1 EP1019627 A1 EP 1019627A1 EP 98946524 A EP98946524 A EP 98946524A EP 98946524 A EP98946524 A EP 98946524A EP 1019627 A1 EP1019627 A1 EP 1019627A1
Authority
EP
European Patent Office
Prior art keywords
core
pump according
section
nozzle
channel
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.)
Granted
Application number
EP98946524A
Other languages
German (de)
French (fr)
Other versions
EP1019627B1 (en
Inventor
Bruno Sertier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marwal Systems SAS
Original Assignee
Marwal Systems SAS
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
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
Application granted granted Critical
Publication of EP1019627B1 publication Critical patent/EP1019627B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 particular, but not exclusively, application in the field of motor vehicle fuel tanks.
  • the present invention can find application in the transfer of fuel between different pockets for multi-pocket fuel tanks, or for the filling of a reserve bowl from which draws a fuel pump or any other fuel supply device.
  • Examples of fuel suction devices based on a jet pump are illustrated in documents DE-A-3 915 185, DE-A-3 612 194 or DE-A-2 602 234.
  • the known jet pump-based suction devices are not always satisfactory, however.
  • the flow rate injected into the jet pump corresponding to a return of fuel from the engine, or even to a bypass of fuel taken from the outlet of the pump, sometimes exhibits fluctuations in pressure and / or high flow rates so that it is difficult to adapt the characteristics of the jet pump, and in particular to avoid the appearance of significant back pressures, at the inlet of the jet pump, if the section of the outlet nozzle is too narrow for the flow rate and / or pressure injected.
  • DE-A-4 201 037 to have inside the nozzle, upstream of the outlet nozzle thereof, a plunger core carried by a spring-loaded diaphragm, so that the plunger core recedes in the event of an increase in pressure to increase the free cross-section of the nozzle.
  • document DE-A-4 201 037 proposes to produce the very body of the nozzle in the form of a deformable element with respect to a fixed plunger core, here again to adapt the outlet section of the nozzle to the pressure injected .
  • the Applicant has itself proposed in its French patent application No. 96 11739 filed on September 26, 1996 a jet pump in which the nozzle which receives the injected flow is formed of a nozzle composed of several lips made of elastic material adapted to so that the nozzle has a variable section according to the pressure and the flow injected.
  • the present invention now aims to provide a new improved jet pump.
  • a jet pump comprising a nozzle and a core mounted to move opposite the nozzle outlet nozzle and downstream from it.
  • the core has a growing cross section away from the nozzle outlet nozzle.
  • the core is provided with a through longitudinal channel forming an auxiliary nozzle.
  • the operation of this alternative embodiment will be described later.
  • 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 show schematic views in transverse section 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 represent four alternative embodiments of a nozzle end according to the present invention
  • 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 show schematic views in transverse section 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 represent four alternative embodiment
  • FIG. 10 represents a schematic view in longitudinal section of a pump jet pe according to an alternative embodiment of the present invention
  • Figures 11 and 12 show the same variant for two different flow rates injected into the pump
  • Figures 13 and 14 show views in longitudinal section of two other variants of realization in accordance with the present invention.
  • a jet pump according to the present invention comprising a cylinder housing 10 centered on a longitudinal axis 0-0.
  • This housing 10 defines a control input 12 receiving the injected flow, at a first axial end.
  • the axial outlet 14 of the pump is defined at the opposite axial end.
  • the housing 10 also has an auxiliary suction inlet 16 which communicates laterally with the internal channel 18 of the housing 10.
  • This auxiliary suction input 16 is disposed near the control input 12. It can be formed by a tube inclined relative to the axis 0-0 of the housing, for example by an angle between 10 ° and 90 °.
  • the housing 10 has at the input 12 a nozzle 20. Thereafter this nozzle 20 will be called “main” nozzle. It may be a nozzle attached to the inlet 12 as illustrated in FIG. 1, or else a nozzle integrated by manufacture in the housing 10 or in a section of the housing 10. Of course, a seal must be defined between the inlet of the nozzle 20 and the inlet 12 of the housing 10.
  • the nozzle 20 is composed of two sections 22, 24 juxtaposed axially.
  • the first section 22 in the direction of flow is preferably of converging frustoconical 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 preferably cylindrical in revolution and of constant section.
  • the free outer end 240 of this section 24 is preferably slightly rounded.
  • FIGS. 6 to 9 will describe various embodiments of such a nozzle end.
  • the cross section of the section 180 of the channel 18 formed in the housing 10 is preferably cylindrical in revolution and of constant size.
  • a core 30 is disposed opposite the outlet nozzle of the nozzle 20, being guided in translation, along the axis 0-0, against the stress of a spring 40 .
  • the core 30 can be guided along the 0-0 axis by many appropriate means.
  • the core 30 is provided with a central internal blind channel 32 opening on its rear end opposite to the nozzle 20. Furthermore, the core 30 is engaged, by this channel 32, on a rod 50 centered in the channel 18 and connected to the housing 10.
  • this rod 50 can thus be supported on the internal surface of the housing 10, in the channel thereof, by three fins 52 equi-distributed at 120 ° around the axis 0-0.
  • This rod 50 has over most of its length a cylindrical section of constant size complementary to the cross section of the channel 32 formed in the core 30.
  • the rod 50 preferably has a tapered or convergent rear section 54 tapered away from the nozzle 20.
  • the front face 56 of the rod 50 is preferably flat and orthogonal to the axis 0-0.
  • the rear face 58 of the rod 50 is preferably rounded or conical.
  • the fins 52 are connected to the cylindrical part of the rod 50, immediately upstream of the transition zone towards the tapered section 54.
  • the core 30 has for its part a generally cylindrical outer envelope of revolution and of constant section.
  • the core 30 however has a frustoconical front section 34 terminated by a front end generally in a hemisphere or in a warhead 36.
  • the core 30 also has a rear frustoconical section 38.
  • the spring 40 is advantageously a helical compression spring disposed 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 resting against the nozzle outlet nozzle 20, more precisely against the rear surface 240 of the section 24 or on a contact generator thereof.
  • 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 transition zone between the frustoconical section 34 diverging and the front end in hemisphere 36.
  • the channel 18 formed in the housing 10 may have a section 181 converging towards the outlet 14, itself followed by a section 182 of constant cylindrical cross section.
  • the length of the converging section 181 is advantageously equal to the length of the diverging section 34 of the core 30.
  • the core 30 is advantageously guided along the axis 0-0, at its cylindrical section of revolution, by guide studs 17, for example three guide studs equi-distributed at 120 °. These are preferably arranged in the extension of the fins 52.
  • FIG. 6 illustrates a first alternative embodiment of the end 240 of the nozzle 20.
  • the internal surface 202 and the external surface 204 of the section 24 of the nozzle 20 are cylindrical of revolution around the axis 0 -0, and the end 240 of the nozzle 20 is formed of a toric cap 208, that is to say delimited in cross section by a circular sector, which is tangentially connected to the external surface 204 and which joins the internal surface 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 level of the connection between them can make the subject to various variations. It is typically of the order of 90 °.
  • the second embodiment of the nozzle end 240 illustrated in FIG. 7 differs from that illustrated in FIG. 6 and previously described, by the fact that the toric cap 208 does not connect to the internal surface 202 in the form of a circular edge 206, but is tangentially connected to a second O-ring surface 210, radially internal, which itself is tangentially connected to the internal surface 202.
  • the contact at rest between the core 30 and the nozzle 20 is thus defined at the level of this toric surface 210.
  • the second radially internal toric surface 210 has a radius of curvature less than that of the radially external toric surface 208.
  • the radius of the radially external toric surface 208 is of the order of 1 to 2 mm, while the radius of the radially internal toric surface 210 is of the order of 0.05 to 0 , 5 mm.
  • FIG. 8 illustrates a third alternative embodiment according to which a planar surface in a ring 212, or if need be of frustoconical shape, is interposed between the two toric surfaces 208 and 212.
  • FIG. 9 a fourth alternative embodiment has been illustrated in FIG. 9 which differs from that illustrated in FIG. 8 by the fact that the radially external toric surface 208 is replaced by a chamfer or frustoconical surface 214.
  • end 240 of the nozzle 20 can be the subject of numerous other alternative embodiments.
  • the jet pump architecture in accordance with the present invention makes it possible to avoid any discharge valve upstream of the nozzle 20.
  • the present invention avoids any loss of the return flow, in the form of external discharge, so that the flow injected Qi is permanently equal to the return flow.
  • the ejection section that is to say the free section of the nozzle 20 is reduced and makes it possible to increase the power transmitted to the jet pump by a high injection pressure Pi.
  • the core 30 moves back by compression of the spring 40, with respect to the nozzle 20 which makes it possible to increase the passage section at the outlet of the nozzle and to limit the back pressure upstream of the nozzle 20 to a acceptable level.
  • Venturi core 30 translating downstream of the nozzle 20 thus guarantees optimal jet pump efficiency for the lowest flow rates injected Qi (by reducing the nozzle diameter
  • the flow of the flow leaving the nozzle 20 takes place in the form of a conical film channeled by the convergent towards the annular mixer.
  • the taper angle 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 the section 181 of the channel 18 is of l 'order of 5 °
  • the section 54 of the rod 50 is of the order of 6 °.
  • FIG. 5 An alternative embodiment has been illustrated in FIG. 5 which will not be described in detail, and which is essentially distinguished from the embodiment previously described by the fact that the core element 30 urged by the spring 40 opposite the nozzle outlet nozzle 20, and downstream of it, is guided in translation along the axis 0-0, by the rod 50 linked to the housing 10, not outside of this rod, but to the 'interior thereof, more specifically in a blind channel 51 which opens onto the front surface of this rod 50.
  • the embodiment illustrated in Figures 10 to 12 attached.
  • This variant differs essentially from those previously described, by the fact that according to FIGS. 10 to 12, the core 30 is provided with a longitudinal channel passing through 300. This forms an auxiliary nozzle whose operation will be described later.
  • this channel 300 can be the subject of various variants. According to the embodiment illustrated in FIGS. 10 to 12, the channel 300 is formed of three successive sections, 302, 304, 306, which follow one another from the nozzle 20, towards the outlet of the pump.
  • the first section 302 is cylindrical in revolution and of constant section. It typically extends over 4/5 of the length of the core 30.
  • the second section 304 converges towards the outlet of the pump.
  • the third section 306 is cylindrical in revolution and of at least substantially constant section.
  • the outlet diameter of the channel 300 ie the outlet diameter of the section 306 (which forms an auxiliary nozzle) is between 0.4 and 1 mm.
  • the core 30 is guided in translation opposite the outlet of the nozzle 20 and biased towards this outlet by a spring 40.
  • the core 30 can be guided in translation by any suitable means. According to the nonlimiting embodiment illustrated in FIGS. 10 to 12, there are provided 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 volume internal free complementary to the external envelope of the core 30. As a variant, the fins 310 can be made integral with the core 30.
  • the spring 40 can take various configurations.
  • the back pressure Pi remains below the opening pressure threshold Ps of the core 30 (function of the setting of the compression spring 40), which localizes the injection at through the auxiliary nozzle formed by the longitudinal channel 300 of the core 30 (see Figure 11).
  • the Venturi effect is then produced in a conventional manner and the transferred flow is collected through the mixing tube located downstream from the core 30.
  • a single flow annular jet pump can be obtained, according to the architecture illustrated in FIGS. 10 to 12, by obstructing the channel 300 formed in the core 30.
  • FIG. 14 an alternative embodiment with a double flow in which the core 30 provided with a longitudinal transverse channel 300 rests on the outlet of the nozzle 20 via a support surface of geometry hemispherical or semi-toroidal (while the bearing surface of the core 30 is generally frustoconical according to FIGS. 10 to 12); and in FIG. 13, an alternative embodiment which differs from FIG. 14 only in that the channel 300 is obstructed.
  • the embodiment of FIG. 13 corresponds to a simple flow.
  • the core 30 is guided by fins 310 as described with reference to Figures 10 to 12; and the spring 40 is supported between the core 30 and fins 110 secured to the housing 10.

Abstract

The invention concerns a jet pump, in particular for transferring fuel into a motor vehicle fuel tank, characterised in that it comprises a main jet (20), and a core (30) mounted mobile opposite the main jet (20) nozzle and downstream thereof.

Description

POMPE A JET COMPRENANT UN GICLEUR DE SECTION VARIABLEJET PUMP COMPRISING A VARIABLE SECTION JET
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 particular, but not exclusively, application in the field of motor vehicle fuel tanks.
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.More precisely still the present invention can find application in the transfer of fuel between different pockets for multi-pocket fuel tanks, or for the filling of a reserve bowl from 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 fuel suction devices based on a jet pump are illustrated in 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. 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.Although having already rendered great services, the known jet pump-based suction devices are not always satisfactory, however. In particular, it has been observed that the flow rate injected into the jet pump, corresponding to a return of fuel from the engine, or even to a bypass of fuel taken from the outlet of the pump, sometimes exhibits fluctuations in pressure and / or high flow rates so that it is difficult to adapt the characteristics of the jet pump, and in particular to avoid the appearance of significant back pressures, at the inlet of the jet pump, if the section of the outlet nozzle is too narrow for the flow rate and / or pressure injected.
Diverses propositions ont été formulées pour tenter d'éliminer cet inconvénient.Various proposals have been made to try to eliminate this drawback.
Ainsi on a par exemple proposé dans le documentSo, for example, we proposed in the 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.DE-A-4 201 037 to have inside the nozzle, upstream of the outlet nozzle thereof, a plunger core carried by a spring-loaded diaphragm, so that the plunger core recedes in the event of an increase in pressure to increase the free cross-section of the nozzle. According to a variant, document DE-A-4 201 037 proposes to produce the very body of the nozzle in the form of a deformable element with respect to a fixed plunger core, here again to adapt the outlet section of the nozzle to the pressure injected .
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 No. 96 11739 filed on September 26, 1996 a jet pump in which the nozzle which receives the injected flow is formed of a nozzle composed of several lips made of elastic material adapted to so that the nozzle has a variable section according to the pressure and the flow injected.
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 opening when the pressure injected exceeds a setting threshold of the valve. However, these solutions have the disadvantage of losing part of the fluid, drifting through the valve, so that this part of fluid is 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 provide a new improved jet pump.
Ce but est atteint dans le cadre de la présente invention grâce à une pompe à jet comprenant un gicleur et un noyau monté à déplacement en regard de la buse de sortie du gicleur et en aval de celle-ci. Selon une caractéristique avantageuse de la présente invention, le noyau possède une section droite croissante en éloignement de la buse de sortie du gicleur.This object is achieved in the context of the present invention by means of a jet pump comprising a nozzle and a core mounted to move opposite the nozzle outlet nozzle and downstream from it. According to an advantageous characteristic of the present invention, the core has a growing cross section away from the nozzle outlet nozzle.
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 according to the present invention, the core is provided with a through longitudinal channel forming an auxiliary nozzle. The operation of this alternative embodiment will be described later.
D'autres caractéristiques, buts et avantages de la présente invention apparaîtront 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. On aperçoit sur la figure 1 annexée une pompe à jet conforme à la présente invention comprenant un boîtier cylindre 10 centré sur un axe longitudinal 0-0.Other characteristics, objects 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 show schematic views in transverse section 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 represent four alternative embodiments of a nozzle end according to the present invention, FIG. 10 represents a schematic view in longitudinal section of a pump jet pe according to an alternative embodiment of the present invention, - Figures 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 variants of realization in accordance with the present invention. We see in Figure 1 attached a jet pump according to the present invention comprising a cylinder housing 10 centered on a longitudinal axis 0-0.
Ce boîtier 10 définit une entrée de commande 12 recevant le débit injecté, à une première extrémité axiale. La sortie axiale 14 de la pompe est définie à l'extrémité axiale opposée.This housing 10 defines a control input 12 receiving the injected flow, at a first axial end. The axial outlet 14 of the pump is defined at the opposite axial end.
Le boîtier 10 possède en outre une entrée auxiliaire d'aspiration 16 qui communique latéralement avec le canal interne 18 du boîtier 10.The housing 10 also has an auxiliary suction inlet 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 0-0 du boîtier, par exemple d'un angle compris entre 10° et 90°.This auxiliary suction input 16 is disposed near the control input 12. It can be formed by a tube inclined relative to the axis 0-0 of the housing, for example by an angle between 10 ° and 90 °.
Le boîtier 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 boîtier 10 ou à un tronçon du boîtier 10. Bien entendu, une étanchéité doit être définie entre l'entrée du gicleur 20 et l'entrée 12 du boîtier 10.The housing 10 has at the input 12 a nozzle 20. Thereafter this nozzle 20 will be called "main" nozzle. It may be a nozzle attached to the inlet 12 as illustrated in FIG. 1, or else a nozzle integrated by manufacture in the housing 10 or in a section of the housing 10. Of course, a seal must be defined between the inlet of the nozzle 20 and the inlet 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 preferred embodiment illustrated in the appended figures, the nozzle 20 is composed of two sections 22, 24 juxtaposed axially.
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 direction of flow is preferably of converging frustoconical 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 preferably cylindrical in revolution and of constant section. The free outer end 240 of this section 24 is preferably slightly rounded. Next, FIGS. 6 to 9 will describe various embodiments of such a nozzle end.
Sur la longueur axiale du gicleur 20, la section droite du tronçon 180 du canal 18 formée dans le boîtier 10 est de préférence cylindrique de révolution et de dimension constante. 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 0-0, contre la sollicitation d'un ressort 40.Over the axial length of the nozzle 20, the cross section of the section 180 of the channel 18 formed in the housing 10 is preferably cylindrical in revolution and of constant size. As indicated above, in the context of the present invention, a core 30 is disposed opposite the outlet nozzle of the nozzle 20, being guided in translation, along the axis 0-0, against the stress of a spring 40 .
Le noyau 30 peut être guidé selon l'axe 0-0 par de nombreux moyens appropriés .The core 30 can be guided along the 0-0 axis 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 boîtier 10. A titre d'exemple non limitatif, cette tige 50 peut ainsi être supportée sur la surface interne du boîtier 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 central internal blind channel 32 opening on its rear end opposite to the nozzle 20. Furthermore, the core 30 is engaged, by this channel 32, on a rod 50 centered in the channel 18 and connected to the housing 10. By way of nonlimiting example, this rod 50 can thus be supported on the internal surface of the housing 10, in the channel thereof, 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 over most of its length a cylindrical section of constant size complementary to the cross section of the channel 32 formed in the core 30. However, the rod 50 preferably has a tapered or convergent rear section 54 tapered away from the nozzle 20.
La face avant 56 de la tige 50 est de préférence plane et orthogonale à l'axe 0-0. 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 flat and orthogonal to the axis 0-0. On the other hand, the rear face 58 of the 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. Le noyau 30 possède quant à lui une enveloppe extérieure généralement cylindrique de révolution et de section constante.The fins 52 are connected to the cylindrical part of the rod 50, immediately upstream of the transition zone towards the tapered section 54. The core 30 has for its part a generally cylindrical outer envelope of revolution and of 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. 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. 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. 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 however has a frustoconical front section 34 terminated by a front end generally in a hemisphere or in a warhead 36. The core 30 also has a rear frustoconical section 38. The spring 40 is advantageously a helical compression spring disposed in the channel 32 of the core 30 between the front face 56 of the rod 50 and the bottom of the channel 32. Thus, those skilled in the art will readily understand that the spring 40 urges the core 30 resting against the nozzle outlet nozzle 20, more precisely against the rear surface 240 of the section 24 or on a contact generator thereof. 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 transition zone between the frustoconical section 34 diverging 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 boîtier 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 section 180 of constant cross section, the length of which coincides with the length of the nozzle 20, the channel 18 formed in the housing 10 may have a section 181 converging towards the outlet 14, itself followed by a section 182 of constant cylindrical cross section.
La longueur du tronçon 181 convergent est avantageusement égale à la longueur du tronçon divergent 34 du noyau 30. Enfin, comme on le voit à l'examen des figures 1 et 3 , le noyau 30 est avantageusement guidé selon l'axe 0-0, 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 .The length of the converging section 181 is advantageously equal to the length of the diverging section 34 of the core 30. Finally, as can be seen on examining FIGS. 1 and 3, the core 30 is advantageously guided along the axis 0-0, at its cylindrical section of revolution, by guide studs 17, for example three guide studs equi-distributed at 120 °. These are 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. 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 0-0, 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°.It is important to note that in the context of the present invention the contact zone defined between the front end of the core 30 and the outlet nozzle of the nozzle 20 has a limited amplitude. FIG. 6 illustrates a first alternative embodiment 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 0 -0, and the end 240 of the nozzle 20 is formed of a toric cap 208, that is to say delimited in cross section by a circular sector, which is tangentially connected to the external surface 204 and which joins the internal surface 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 level of the connection between them can make the subject to various variations. It 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 nozzle end 240 illustrated in FIG. 7 differs from that illustrated in FIG. 6 and previously described, by the fact that the toric cap 208 does not connect to the internal surface 202 in the form of a circular edge 206, but is tangentially connected to a second O-ring surface 210, radially internal, which itself is tangentially connected to the internal surface 202. The contact at rest between the core 30 and the nozzle 20 is thus defined at the level of this toric surface 210. The second radially internal toric surface 210 has a radius of curvature less than that of the radially external toric surface 208. Typically, but not limited to, the radius of the radially external toric surface 208 is of the order of 1 to 2 mm, while the radius of the radially internal toric surface 210 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.FIG. 8 illustrates a third alternative embodiment according to which a planar surface in a ring 212, or if need be 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, a fourth alternative embodiment has been illustrated in FIG. 9 which differs from that illustrated in FIG. 8 by the fact that the radially external toric surface 208 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 numerous other alternative embodiments.
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.Thus, it is possible to envisage directly connecting the chamfer 214 to the radially internal toric surface 210. Or else it is possible to replace the toric surface 208 by an annular surface whose generatrix in cross section has a progressively increasing radius towards the outside.
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 in accordance with the present invention makes it possible to avoid any discharge valve upstream of the nozzle 20. Thus, the present invention avoids any loss of the return flow, in the form of external discharge, so that the flow injected 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 lower injected flows, the ejection section, that is to say the free section of the nozzle 20 is reduced and makes it possible to increase the power transmitted 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 flow rates, the core 30 moves back by compression of the spring 40, with respect to the nozzle 20 which makes it possible to increase the passage section at the outlet of the nozzle and to limit the back pressure upstream of the nozzle 20 to a 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 gicleurThe use of a Venturi core 30 translating downstream of the nozzle 20 thus guarantees optimal jet pump efficiency for the lowest flow rates injected Qi (by reducing the nozzle diameter
20 et augmentation de la vitesse d'injection). 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.20 and increased injection speed). The flow of the flow leaving the nozzle 20 takes place in the form of a conical film channeled by the convergent towards 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 taper angle 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 the section 181 of the channel 18 is of l 'order of 5 ° and the 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 0-0, par la tige 50 liée au boîtier 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. On va maintenant décrire la variante de réalisation illustrée sur les figures 10 à 12 annexées.An alternative embodiment has been illustrated in FIG. 5 which will not be described in detail, and which is essentially distinguished from the embodiment previously described by the fact that the core element 30 urged by the spring 40 opposite the nozzle outlet nozzle 20, and downstream of it, is guided in translation along the axis 0-0, by the rod 50 linked to the housing 10, not outside of this rod, but to the 'interior thereof, more specifically in a blind channel 51 which opens onto the front surface of this rod 50. We will now describe the 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 differs essentially from those previously described, by the fact that according to FIGS. 10 to 12, the core 30 is provided with a longitudinal channel passing through 300. This forms an auxiliary nozzle whose operation will be described later.
La géométrie de ce canal 300 peut faire l'objet de diverses variantes . 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.The geometry of this channel 300 can be the subject of various variants. According to the embodiment illustrated in FIGS. 10 to 12, the channel 300 is formed of three successive sections, 302, 304, 306, which follow one another from the nozzle 20, towards the outlet of the pump.
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. Le second tronçon 304 est convergent en direction de la sortie de la pompe.The first section 302 is cylindrical in revolution and of constant section. It typically extends over 4/5 of the length of the core 30. The second section 304 converges towards the outlet of the pump.
Le troisième tronçon 306 est cylindrique de révolution et de section au moins sensiblement constante. 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.The third section 306 is cylindrical in revolution and of at least substantially constant section. Typically the outlet diameter of the channel 300, ie the outlet diameter of the section 306 (which forms an auxiliary nozzle) is between 0.4 and 1 mm.
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 described above for the embodiments illustrated in FIGS. 1 to 9, the core 30 is guided in translation opposite the outlet of the nozzle 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 boîtier 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 any suitable means. According to the nonlimiting embodiment illustrated in FIGS. 10 to 12, there are provided 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 volume internal free complementary to the external envelope of the core 30. As a variant, the fins 310 can be made integral with 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 either the operation of the auxiliary nozzle 300 or the flow liable to flow between the outlet of the nozzle 20 and the external surface of the core 30, and consequently that don't 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 boîtier 10, par exemple trois ailettes 110 réparties à 120°. Les dispositions illustrées sur les figures 10 àAccording to the embodiment illustrated in Figures 10 to 12, it is formed of a spiral spring which bears 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 inner wall of the housing 10, for example three fins 110 distributed at 120 °. The arrangements illustrated in FIGS. 10 to
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 1/h) tout en limitant la contre-pression (ou pression d'injection) à débit retour maximal . 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 20.12 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) at maximum return flow. When the flow rate in the inlet 12 is zero, the same is true for the flow rate in the suction inlet 16, and for the flow rate in the outlet 14 (see FIG. 10). 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 the inlet 12 is low, the back pressure Pi remains below the opening pressure threshold Ps of the core 30 (function of the setting of the compression spring 40), which localizes the injection at through the auxiliary nozzle formed by the longitudinal channel 300 of the core 30 (see Figure 11). The Venturi effect is then produced in a conventional manner and the transferred flow is collected through the mixing tube located downstream from 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) . Bien entendu la présente invention n'est pas limitée aux modes de réalisation particulier qui viennent d'être décrits mais s'étend à toute variante conforme à son esprit .When the flow Qi injected into the inlet 12 increases, the back pressure passes above the pressure threshold Ps and the core 30 gradually recedes by deformation of the spring 40, freeing an annular passage section between the core 30 and the nozzle 20 , as described above with reference to FIGS. 1 to 9. This discharge makes it possible to limit the increase in pressure above Ps for the high flows injected Qi, while guaranteeing a secondary Venturi effect at the outlet of the nozzle 300, which contributes to the increase in the flow rate Qa sucked through the inlet 16, after the core 30 recedes (see FIG. 12). Of course the present invention is not limited to the particular embodiments which have just been described but extends to any variant in accordance with its spirit.
On notera en particulier 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.It will be noted in particular that a single flow annular jet pump can be obtained, according to the architecture illustrated in FIGS. 10 to 12, by 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 boîtier 10. There is thus illustrated in FIG. 14, an alternative embodiment with a double flow in which the core 30 provided with a longitudinal transverse channel 300 rests on the outlet of the nozzle 20 via a support surface of geometry hemispherical or semi-toroidal (while the bearing surface of the core 30 is generally frustoconical according to FIGS. 10 to 12); and in FIG. 13, an alternative embodiment which differs from FIG. 14 only in that the channel 300 is obstructed. Thus the embodiment of FIG. 13 corresponds to a simple flow. In both cases of Figures 13 and 14, the core 30 is guided by fins 310 as described with reference to Figures 10 to 12; and the spring 40 is supported between the core 30 and fins 110 secured to the housing 10.

Claims

REVENDICATIONS
1. Pompe à jet, notamment pour le transfert de carburant dans un réservoir de carburant de véhicule automobile, caractérisée par le fait qu'elle comprend un gicleur principal (20) , et un noyau (30) monté à déplacement en regard de la buse de sortie du gicleur principal (20) et en aval de celle-ci.1. Jet pump, in particular for transferring fuel into a fuel tank of a motor vehicle, characterized in that it comprises a main nozzle (20), and a core (30) mounted to move opposite the nozzle outlet of the main nozzle (20) and downstream thereof.
2. Pompe selon la revendication 1, caractérisé par le fait que le noyau (30) possède une section droite croissante en éloignement de la buse de sortie du gicleur principal (20) .2. Pump according to claim 1, characterized in that the core (30) has a growing cross section away from the outlet nozzle of the main nozzle (20).
3. Pompe selon l'une des revendications 1 ou 2, caractérisée par le fait que le noyau (30) est muni d'un canal longitudinal traversant (300) formant un gicleur auxiliaire (306) .3. Pump according to one of claims 1 or 2, characterized in that the core (30) is provided with a through longitudinal channel (300) forming an auxiliary nozzle (306).
4. Pompe selon la revendication 3, caractérisée par le fait que le diamètre de sortie du canal traversant (300) est compris entre 0,4 et 1mm.4. Pump according to claim 3, characterized in that the outlet diameter of the through channel (300) is between 0.4 and 1mm.
5. Pompe selon l'une des revendications 1 à 4, caractérisée par le fait que le noyau (30) est en contact au repos contre la buse de sortie du gicleur principal (20) .5. Pump according to one of claims 1 to 4, characterized in that the core (30) is in contact at rest against the outlet nozzle of the main nozzle (20).
6. Pompe selon l'une des revendications 1 à 5, caractérisée par le fait que le gicleur principal (20) possède un tronçon convergent (22) suivi d'un tronçon de section constante (24) .6. Pump according to one of claims 1 to 5, characterized in that the main nozzle (20) has a convergent section (22) followed by a section of constant section (24).
7. Pompe selon l'une des revendications 1 à 6, caractérisée par le fait que le demi angle au sommet du gicleur principal (20) est compris entre 10° et 80°.7. Pump according to one of claims 1 to 6, characterized in that the half angle at the top of the main nozzle (20) is between 10 ° and 80 °.
8. Pompe selon l'une des revendications 1 à 7, caractérisée par le fait que 1 ' extrémité de la buse de sortie du gicleur principal (20) est globalement arrondie . 8. Pump according to one of claims 1 to 7, characterized in that one end of the main nozzle outlet nozzle (20) is generally rounded.
9. Pompe selon l'une des revendications 1 à 8, caractérisée par le fait que le noyau (30) possède un tronçon avant globalement tronconique (34) terminé par une extrémité avant en forme générale d'hémisphère ou d'ogive (36) .9. Pump according to one of claims 1 to 8, characterized in that the core (30) has a generally frustoconical front section (34) terminated by a front end in the general shape of a hemisphere or ogive (36) .
10. Pompe selon la revendication 9, caractérisée par le fait que l'angle de conicité du tronçon avant du noyau (30) est de l'ordre de 8°.10. Pump according to claim 9, characterized in that the taper angle of the front section of the core (30) is of the order of 8 °.
11. Pompe selon l'une des revendications 1 à 10, caractérisée par le fait que le noyau (30) possède une enveloppe générale cylindrique de section constante.11. Pump according to one of claims 1 to 10, characterized in that the core (30) has a generally cylindrical envelope of constant section.
12. Pompe selon l'une des revendications 1 à 11, caractérisée par le fait que le noyau (30) possède un tronçon arrière (38) convergent en éloignement du gicleur principal (20) .12. Pump according to one of claims 1 to 11, characterized in that the core (30) has a rear section (38) converging away from the main nozzle (20).
13. Pompe selon l'une des revendications 1 à 12, caractérisée par le fait qu'elle comprend un ressort (40) intercalé entre l'extrémité avant d'un support (50) et le noyau (30) . 13. Pump according to one of claims 1 to 12, characterized in that it comprises a spring (40) interposed between the front end of a support (50) and the core (30).
14. Pompe selon l'une des revendications 1 à 13, caractérisée par le fait que le noyau est guidé par des moyens support liés à la paroi interne du boîtier (10) par des ailettes radiales (52) .14. Pump according to one of claims 1 to 13, characterized in that the core is guided by support means connected to the internal wall of the housing (10) by radial fins (52).
15. Pompe selon l'une des revendications 1 à 14, caractérisée par le fait que le boîtier (10) de pompe définit un canal interne possédant un tronçon (181) convergent dans le sens d'écoulement, en regard du tronçon divergent du noyau (30) .15. Pump according to one of claims 1 to 14, characterized in that the pump housing (10) defines an internal channel having a section (181) converging in the direction of flow, opposite the divergent section of the core (30) .
16. Pompe selon la revendication 15, caractérisée par le fait que la longueur du tronçon convergent du canal16. Pump according to claim 15, characterized in that the length of the converging section of the channel
(18) formé dans le boîtier (10) est de l'ordre de grandeur de la longueur du tronçon divergent (34) formé sur le noyau (30) .(18) formed in the housing (10) is of the order of magnitude of the length of the divergent section (34) formed on the core (30).
17. Pompe selon l'une des revendications 1 à 16, caractérisée par le fait que le noyau (30) est guidé à l'intérieur du canal (18) du boîtier (10) par des gaudrons radiaux (17) liés à la surface interne de ce canal (18) . 17. Pump according to one of claims 1 to 16, characterized in that the core (30) is guided inside the channel (18) of the housing (10) by radial gaudrons (17) linked to the internal surface of this channel (18).
18. Pompe selon l'une des revendications 1 à 17, caractérisée par le fait que le contact défini entre le noyau (30) et la buse de sortie (24) du gicleur principal (20) est formé d'une arête circulaire18. Pump according to one of claims 1 to 17, characterized in that the contact defined between the core (30) and the outlet nozzle (24) of the main nozzle (20) is formed by a circular edge
(206) . (206).
19. Pompe selon l'une des revendications 1 à 17, caractérisée par le fait que le contact défini entre le noyau (30) et la buse de sortie (24) du gicleur principal (20) est formé au niveau d'une calotte globalement torique (210) de ladite buse de sortie. 19. Pump according to one of claims 1 to 17, characterized in that the contact defined between the core (30) and the outlet nozzle (24) of the main nozzle (20) is formed at the level of a cap generally O-ring (210) of said outlet nozzle.
20. Pompe selon la revendication 19, caractérisée par le fait que le rayon de ladite calotte globalement torique (210) est compris entre 0,05 et 0,5 mm.20. Pump according to claim 19, characterized in that the radius of said generally toroidal cap (210) is between 0.05 and 0.5 mm.
21. Pompe selon la revendication 3, caractérisée par le fait que le canal longitudinal (300) du noyau (30) possède un tronçon convergent (304) . 21. Pump according to claim 3, characterized in that the longitudinal channel (300) of the core (30) has a convergent section (304).
22. Réservoir de carburant équipé d'une pompe à jet conforme à l'une des revendications 1 à 21. 22. Fuel tank equipped with a jet pump according to one of claims 1 to 21.
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
FR9712206 1997-10-01
FR9712206A FR2769053B1 (en) 1997-10-01 1997-10-01 JET PUMP COMPRISING A VARIABLE SECTION JET
FR9806524 1998-05-25
FR9806524A FR2769054B1 (en) 1997-10-01 1998-05-25 JET PUMP COMPRISING A VARIABLE SECTION JET
PCT/FR1998/002083 WO1999017013A1 (en) 1997-10-01 1998-09-29 Jet pump comprising a jet with variable cross-section

Publications (2)

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

Family

ID=26233828

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98946524A Expired - Lifetime EP1019627B1 (en) 1997-10-01 1998-09-29 Jet pump comprising a jet with variable cross-section

Country Status (8)

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US (1) US6364625B1 (en)
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
FR2769054A1 (en) 1999-04-02
AR015461A1 (en) 2001-05-02
DE69814654D1 (en) 2003-06-18
BR9812571A (en) 2000-07-25
FR2769054B1 (en) 2001-12-07
DE69814654T2 (en) 2004-04-08
US6364625B1 (en) 2002-04-02
WO1999017013A1 (en) 1999-04-08
JP2001518594A (en) 2001-10-16
EP1019627B1 (en) 2003-05-14

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