EP1084342A1 - Assembly for transferring fuel from a motor vehicle tank - Google Patents

Assembly for transferring fuel from a motor vehicle tank

Info

Publication number
EP1084342A1
EP1084342A1 EP99920912A EP99920912A EP1084342A1 EP 1084342 A1 EP1084342 A1 EP 1084342A1 EP 99920912 A EP99920912 A EP 99920912A EP 99920912 A EP99920912 A EP 99920912A EP 1084342 A1 EP1084342 A1 EP 1084342A1
Authority
EP
European Patent Office
Prior art keywords
jet pump
nozzle
assembly according
outlet
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.)
Granted
Application number
EP99920912A
Other languages
German (de)
French (fr)
Other versions
EP1084342B1 (en
Inventor
Daniel Brunel
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
Application filed by Marwal Systems SAS filed Critical Marwal Systems SAS
Publication of EP1084342A1 publication Critical patent/EP1084342A1/en
Application granted granted Critical
Publication of EP1084342B1 publication Critical patent/EP1084342B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus 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
    • F02M37/02Feeding by means of suction apparatus, e.g. by air flow through carburettors
    • F02M37/025Feeding by means of a liquid fuel-driven jet pump
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus 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
    • F02M37/04Feeding by means of driven pumps
    • F02M37/08Feeding by means of driven pumps electrically driven
    • F02M37/10Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
    • F02M37/106Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir the pump being installed in a sub-tank

Definitions

  • the present invention relates to the field of fuel drawing assemblies in a motor vehicle tank. Many devices have already been proposed for drawing fuel from a tank and directing this fuel towards the engine supply (carburetor or injector).
  • a reserve bowl placed in the fuel tank.
  • a reserve bowl can be filled from the tank by a float valve which opens to let fuel pass from the tank to the reserve bowl when the level in the tank is higher than the level in the reserve bowl .
  • the jet pump is generally supplied by an output stage of the main pump or by the output of the pressure regulator. It draws fuel into the tank and its outlet opens into the reserve bowl.
  • a drawing assembly comprising a main pump associated with a pressure regulator and a reserve bowl fed by a jet pump and into which the main pump is drawn, characterized by the fact that the jet pump is integrated at the outlet of the pressure regulator and that the sub- comprising the main pump and the reserve bowl, a part of the pressure regulator housing being integrated into the wall making up the reserve bowl.
  • the present invention makes it possible to facilitate the adjustment of the jet pump / regulator sub-assembly, compared with the known prior arrangements.
  • the structure proposed in the context of the present invention makes it possible to eliminate any need for sealing means added between the outlet of the pressure regulator and the inlet of the jet pump.
  • the invention also relates to fuel tanks for motor vehicles equipped with such a drawing assembly.
  • FIG. 1 represents a schematic view of the general architecture of a drawing device according to the present invention
  • FIGS. 2 and 3 show schematic views in vertical section of two alternative embodiments of an integrated pressure regulator / jet pump sub-assembly, in accordance with the present invention.
  • FIG. 1 shows schematic views in vertical longitudinal section of two alternative embodiments of the jet pump according to the present invention. Is illustrated in Figure 1 attached, the general architecture of a drawing assembly according to the present invention.
  • FIG. 1 we see under the general reference 10 a fuel tank whose bottom is referenced 12 and the upper wall is referenced 14.
  • a drawing module 100 is placed in the reservoir 10.
  • this drawing module 100 comprises an electric pump 110, a primary filter 120, a secondary filter 130, a pressure regulator 170 and a jet pump 160.
  • the electric pump 110 has its vertical axis. Its input is connected to the primary filter 120 located near the bottom of the tank 10, more precisely inside the reserve bowl 150 as will be explained later.
  • the output of the electric pump 110 flows into the secondary filter 130 which constitutes a finer filter than the primary filter 120.
  • the secondary filter 130 is an annular filter placed around the pump 110.
  • the fuel coming from the main pump 110 passes radially through the filter 130, from the outside towards the inside of the latter (however the reverse arrangement is possible, that is to say that the pump outlet 110 can flow on the inside of the filter 130 in which case the fuel crosses radially outwards the latter).
  • the filtered fuel is directed via a conduit 132 to a pipe 140 carried by a base 142 intended to be fixed on the upper wall 14 of the tank. From there, the fuel is directed via a line 144 to the injector rail 20.
  • the primary filter 120 into which the inlet of the pump 110 draws is placed in the reserve bowl 150.
  • the latter rests on the tank bottom wall 12 by means of feet 152 of low height.
  • the reserve bowl 150 is designed to be filled by the jet pump 160 associated with the pressure regulator 170.
  • this pressure regulator 170 has a housing 171 which houses a membrane 172.
  • the inlet of the regulator housing 170 is connected to the outlet of the secondary filter 130.
  • the membrane 172 is subjected to the opposing forces of a calibrated spring 173 and the fuel pressure applied via the inlet of the regulator 170.
  • the membrane 172 carries a shutter 174 associated with a fixed seat 175.
  • the shutter 174 rests on the seat 175 and the regulator 170 is closed. The jet pump 160 is then not supplied.
  • the output of the regulator 170 communicates with the input of a nozzle 162.
  • the jet pump 160 also comprises a suction duct 164 which communicates with the bottom of the tank 10 and the outlet of which opens into the body of the jet pump 160 downstream of the nozzle 162.
  • the outlet of the jet pump 160 is associated with means making it possible to degas the fuel before it reaches the reserve bowl 150.
  • a wall 154 can be provided opposite the outlet of the jet pump 160.
  • This wall 154 is tightly connected laterally and at its base to the walls forming the reserve bowl 150.
  • the fuel coming from the jet pump 160 thus strikes the wall 154.
  • the air bubbles possibly conveyed with the fuel in the jet pump 160 are broken.
  • the fuel reaches the reserve bowl 150 proper by overflowing above the wall 154.
  • the wall 154 thus defines the maximum level inside the reserve bowl 150 in the unpowered state of the jet pump 160.
  • such a low wall 154 can be replaced by a spiral with an ascending bottom, the inlet of which is placed opposite the outlet of the jet pump 160 and the outlet of which opens into the reserve bowl 150.
  • the fuel is degassed gradually during its flow on this spiral.
  • the input of the regulator 170 connected at the output of the secondary fine filter 130 according to FIG. 1 could be connected upstream of the fine filter 130.
  • FIG. 2 shows an embodiment of such an integration of the pressure regulator 170 and the jet pump 160.
  • FIG. 2 shows the wall of the reserve bowl 150, the secondary fine filter 130 disposed in a housing 131, the regulator 170 comprising a housing 171, a membrane 172 associated with a spring 173 and which carries a shutter 174 cooperating with a seat 175, as well as the jet pump 160 comprising a nozzle 162 and a suction duct 164.
  • the shutter 174 carried by the membrane 172 is formed of a spherical ball.
  • the seat 175 and the nozzle 162 are formed at the ends of a single piece preferably produced by turning.
  • the geometry of the body of the jet pump 160 can be the subject of numerous variants depending on the characteristics of the pump sought.
  • the jet pump 160 has its horizontal axis.
  • the axis of the jet pump 160 can thus be inclined typically of the order of 18 ° on the horizontal.
  • This arrangement typically makes it possible to reduce the priming height of the jet pump 160 to a height A of the order of 6.4 mm for the variant embodiment illustrated in FIG. 3 relative to a priming height A of l order of 15.7 mm for the embodiment illustrated in FIG. 2.
  • the jet pump 160 can comprise a nozzle of variable section. It may for example be a jet pump in which the nozzle which receives the injected flow is formed by a nozzle composed of several lips made of elastic material adapted so that the nozzle has a variable section according to the pressure and the injected flow, as proposed by the Applicant in its patent application filed in France on September 26, 1996 under No. 96 11739.
  • a jet pump 160 comprising a nozzle 162 and a core 165 mounted displacement opposite the outlet nozzle of the nozzle 162, and downstream thereof.
  • the core 165 can be provided with a longitudinal through channel 166 forming an auxiliary nozzle.
  • the core 165 can be guided in translation along the axis of the jet pump 160 by any suitable known means. Of course, these guide means must not disturb the flow of fuel from the nozzle 162 and suck through the suction pipe 164. It will be noted that the core 165 is biased towards the outlet of the nozzle 162 by a calibrated spring 167.
  • the core 165 rests on the free end of the nozzle 162 in the form of an area limited substantially to a circular edge or on a contact generator defined on the nozzle 162.
  • the particular geometry of the end of the nozzle 162 and the core section 165 resting thereon can be the subject of numerous variant embodiments described in a parallel patent application filed in the name of the Applicant. For these reasons, these different embodiments as well as the detailed structure of the core jet pump illustrated in FIGS. 4 and 5 will not be described in detail below.
  • the operation of the jet pump illustrated in FIG. 4 is essentially the following.
  • the ejection section that is to say the free section of the nozzle 162 is reduced and makes it possible to increase the power transmitted to the jet pump by a high injection pressure.
  • the core 165 moves back by compression of the spring 167, with respect to the nozzle 162 which makes it possible to increase the passage section at the outlet of the nozzle 162 and to limit the back pressure upstream of the nozzle 162 to a acceptable level.
  • the operation of the jet pump illustrated in FIG. 5 is essentially as follows.
  • the flow rate at the outlet of the pressure regulator 170 ie on the inlet of the jet pump 160 is zero, the same is true for the flow rate in the suction inlet 164 and for the flow rate at the outlet of this jet pump.
  • the core 165 rests on the end of the nozzle 162.
  • the back pressure remains below the pressure threshold opening the core 165 (depending on the setting of the compression spring 167) which localizes the injection through the auxiliary nozzle formed by the longitudinal channel 166 of the core 165.
  • the Venturi effect is then produced in a conventional manner and the flow transferred is collected through the mixing tube located downstream of the core 165.
  • provision may be made to use a part of the wall of the reserve bowl in the form of a shell to form a part of the housing 171 of the pressure regulator 170, or else to add the housing 171 of a conventional pressure regulator inside a back formed by this wall of the reserve bowl 150.
  • the fuel drawing assembly in accordance with the present invention is further equipped with means for gauging the level of fuel in the tank 10 conventional per se.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

The invention concerns an fuel- assembly for transferring fuel from a motor vehicle tank comprising a main pump (110) associated with a pressure regulator (170) and a reserve bowl (150) fed by a jet pump (160) and wherein the main pump (110) sucks up. The invention is characterised in that the jet pump (160) is integrated in the pressure regulator outlet (170) and the jet pump (160)/regulator (170) subassembly thus formed is made integral with a module (100) comprising the main pump (110) and the reserve bowl (150).

Description

ENSEMBLE DE PUISAGE DE CARBURANT DANS UN RESERVOIR DEFUEL PUMP ASSEMBLY IN A TANK
VEHICULE AUTOMOBILE.MOTOR VEHICLE.
La présente invention concerne le domaine des ensembles de puisage de carburant dans un réservoir de véhicule automobile. De nombreux dispositifs ont déjà été proposés pour puiser du carburant dans un réservoir et diriger ce carburant vers l'alimentation du moteur (carburateur ou injecteur).The present invention relates to the field of fuel drawing assemblies in a motor vehicle tank. Many devices have already been proposed for drawing fuel from a tank and directing this fuel towards the engine supply (carburetor or injector).
La plupart des dispositifs connus comprennent une pompe électrique associée à un régulateur de pression. On connaît également déjà des dispositifs dans lesquels la pompe électrique puise dans une réserve, généralement dénommée "bol de réserve" placée dans le réservoir de carburant. Un tel bol de réserve peut être rempli à partir du réservoir par un clapet à flotteur qui s'ouvre pour laisser passer du carburant à partir du réservoir vers le bol de réserve quand le niveau dans le réservoir est supérieur au niveau dans le bol de réserve.Most of the known devices include an electric pump associated with a pressure regulator. Devices are also already known in which the electric pump draws from a reserve, generally called a "reserve bowl" placed in the fuel tank. Such a reserve bowl can be filled from the tank by a float valve which opens to let fuel pass from the tank to the reserve bowl when the level in the tank is higher than the level in the reserve bowl .
On a également déjà proposé différentes configurations comprenant une pompe à jet ou pompe à effet Venturi pour alimenter le bol de réserve.We have also already proposed different configurations comprising a jet pump or Venturi effect pump for supplying the reserve bowl.
La pompe à jet est généralement alimentée par un étage de sortie de la pompe principale ou par la sortie du régulateur de pression. Elle aspire du carburant dans le réservoir et sa sortie débouche dans le bol de réserve.The jet pump is generally supplied by an output stage of the main pump or by the output of the pressure regulator. It draws fuel into the tank and its outlet opens into the reserve bowl.
En conclusion, de nombreuses structures de puisage de carburant ont déjà été proposées. Cependant, la plupart de celles-ci sont forts complexes et ne donnent pas toujours satisfaction. La présente invention a maintenant pour but de proposer de nouveaux moyens de puisage de carburant présentant des performances améliorées par rapport aux dispositifs connus.In conclusion, many fuel drawing structures have already been proposed. However, most of these are very complex and are not always satisfactory. The present invention now aims to provide new fuel drawing means having improved performance compared to known devices.
Ce but est atteint dans le cadre de la présente invention grâce à un ensemble de puisage comprenant une pompe principale associée à un régulateur de pression et un bol de réserve alimenté par une pompe à jet et dans lequel aspire la pompe principale, caractérisée par le fait que la pompe à jet est intégrée en sortie du régulateur de pression et que le sous- comportant la pompe principale et le bol de réserve, une partie du boîtier de régulateur de pression étant intégrée à la paroi composant le bol de réserve.This object is achieved in the context of the present invention by means of a drawing assembly comprising a main pump associated with a pressure regulator and a reserve bowl fed by a jet pump and into which the main pump is drawn, characterized by the fact that the jet pump is integrated at the outlet of the pressure regulator and that the sub- comprising the main pump and the reserve bowl, a part of the pressure regulator housing being integrated into the wall making up the reserve bowl.
Comme on le précisera par la suite, la présente invention permet de faciliter le réglage du sous-ensemble pompe à jet/régulateur, par rapport aux dispositions antérieures connues.As will be explained later, the present invention makes it possible to facilitate the adjustment of the jet pump / regulator sub-assembly, compared with the known prior arrangements.
En effet, l'intégration de ces deux composants permet un réglage en usine du régulateur de pression. Ainsi, ce réglage permet de tenir compte de la contre pression avale imposée sur le régulateur par la pompe à jet (laquelle contre pression avale est susceptible de modifier les caractéristiques du régulateur).Indeed, the integration of these two components allows factory adjustment of the pressure regulator. Thus, this adjustment makes it possible to take account of the downstream back pressure imposed on the regulator by the jet pump (which downstream back pressure is likely to modify the characteristics of the regulator).
En outre, la structure proposée dans le cadre de la présente invention permet de supprimer toute nécessité de moyens d'étanchéité rapportée entre la sortie du régulateur de pression et l'entrée de la pompe à jet.In addition, the structure proposed in the context of the present invention makes it possible to eliminate any need for sealing means added between the outlet of the pressure regulator and the inlet of the jet pump.
L'invention concerne également les réservoirs de carburant pour véhicule automobile équipés d'un tel ensemble de puisage.The invention also relates to fuel tanks for motor vehicles equipped with such a drawing assembly.
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 :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:
- la figure 1 représente une vue schématique de l'architecture générale d'un dispositif de puisage conforme à la présente invention,FIG. 1 represents a schematic view of the general architecture of a drawing device according to the present invention,
- les figures 2 et 3 représentent des vues schématiques en coupe verticale de deux variantes de réalisation d'un sous-ensemble intégré régulateur de pression/pompe à jet, conforme à la présente invention, etFIGS. 2 and 3 show schematic views in vertical section of two alternative embodiments of an integrated pressure regulator / jet pump sub-assembly, in accordance with the present invention, and
- les figures 4 et 5 représentent des vues schématiques en coupe longitudinale verticale de deux variantes de réalisation de pompe à jet conformes à la présente invention. On a illustré sur la figure 1 annexée, l'architecture générale d'un ensemble de puisage conforme à la présente invention. Sur cette figure 1 , on aperçoit sous la référence générale 10 un réservoir de carburant dont le fond est référencé 12 et la paroi supérieure est référencée 14.- Figures 4 and 5 show schematic views in vertical longitudinal section of two alternative embodiments of the jet pump according to the present invention. Is illustrated in Figure 1 attached, the general architecture of a drawing assembly according to the present invention. In this FIG. 1, we see under the general reference 10 a fuel tank whose bottom is referenced 12 and the upper wall is referenced 14.
Un module de puisage 100 est placé dans le réservoir 10. Pour l'essentiel, ce module de puisage 100 comprend une pompe électrique 110, un filtre primaire 120, un filtre secondaire 130, un régulateur de pression 170 et une pompe à jet 160.A drawing module 100 is placed in the reservoir 10. Essentially, this drawing module 100 comprises an electric pump 110, a primary filter 120, a secondary filter 130, a pressure regulator 170 and a jet pump 160.
La pompe électrique 110 a son axe vertical. Son entrée est reliée au filtre primaire 120 situé à proximité du fond du réservoir 10, plus précisément à l'intérieur du bol de réserve 150 comme on le précisera par la suite.The electric pump 110 has its vertical axis. Its input is connected to the primary filter 120 located near the bottom of the tank 10, more precisely inside the reserve bowl 150 as will be explained later.
La sortie de la pompe électrique 110 débite dans le filtre secondaire 130 qui constitue un filtre plus fin que le filtre primaire 120.The output of the electric pump 110 flows into the secondary filter 130 which constitutes a finer filter than the primary filter 120.
Selon le mode de réalisation non limitatif représenté sur la figure 1 annexée, le filtre secondaire 130 est un filtre annulaire disposé autour de la pompe 110.According to the nonlimiting embodiment represented in the appended FIG. 1, the secondary filter 130 is an annular filter placed around the pump 110.
Ainsi, le carburant issu de la pompe principale 110 traverse radialement le filtre 130, de l'extérieur vers l'intérieur de celui-ci (cependant la disposition inverse est possible, c'est-à-dire que la sortie de pompe 110 peut débiter sur l'intérieur du filtre 130 auquel cas le carburant traverse radialement vers l'extérieur ce dernier).Thus, the fuel coming from the main pump 110 passes radially through the filter 130, from the outside towards the inside of the latter (however the reverse arrangement is possible, that is to say that the pump outlet 110 can flow on the inside of the filter 130 in which case the fuel crosses radially outwards the latter).
A partir de la sortie du filtre 130, le carburant filtré est dirigé par l'intermédiaire d'un conduit 132 vers une tubulure 140 portée par une embase 142 destinée à être fixée sur la paroi supérieure 14 du réservoir. De là, le carburant est dirigé par l'intermédiaire d'un conduit 144 vers la rampe d'injecteurs 20.From the outlet of the filter 130, the filtered fuel is directed via a conduit 132 to a pipe 140 carried by a base 142 intended to be fixed on the upper wall 14 of the tank. From there, the fuel is directed via a line 144 to the injector rail 20.
Comme on l'a indiqué précédemment, le filtre primaire 120 dans lequel aspire l'entrée de la pompe 110 est disposée dans le bol de réserve 150. Ce dernier repose sur la paroi de fond de réservoir 12 par l'intermédiaire de pieds 152 de faible hauteur.As indicated above, the primary filter 120 into which the inlet of the pump 110 draws is placed in the reserve bowl 150. The latter rests on the tank bottom wall 12 by means of feet 152 of low height.
Le bol de réserve 150 est conçu pour être rempli par la pompe à jet 160 associée au régulateur de pression 170. De préférence, ce régulateur de pression 170 possède un boîtier 171 qui loge une membrane 172. Selon le mode de réalisation particulier illustré sur la figure 1 , l'entrée du boîtier de régulateur 170 est reliée à la sortie du filtre secondaire 130. La membrane 172 est soumise aux efforts antagonistes d'un ressort taré 173 et de la pression de carburant appliquée par l'intermédiaire de l'entrée du régulateur 170.The reserve bowl 150 is designed to be filled by the jet pump 160 associated with the pressure regulator 170. Preferably, this pressure regulator 170 has a housing 171 which houses a membrane 172. According to the particular embodiment illustrated in FIG. 1, the inlet of the regulator housing 170 is connected to the outlet of the secondary filter 130. The membrane 172 is subjected to the opposing forces of a calibrated spring 173 and the fuel pressure applied via the inlet of the regulator 170.
La membrane 172 porte un obturateur 174 associé à un siège fixe 175. Ainsi, quand la pression de carburant est inférieure à l'effort du ressort 173, l'obturateur 174 repose sur le siège 175 et le régulateur 170 est fermé. La pompe à jet 160 n'est alors pas alimentée.The membrane 172 carries a shutter 174 associated with a fixed seat 175. Thus, when the fuel pressure is less than the force of the spring 173, the shutter 174 rests on the seat 175 and the regulator 170 is closed. The jet pump 160 is then not supplied.
Inversement, quand la pression de carburant sur l'entrée du régulateur 170 dépasse l'effort du ressort 173, la membrane 172 et le ressort 173 sont déformés. L'obturateur 174 est décollé du siège 175. Et du carburant peut s'écouler vers la sortie du régulateur 170 qui communique avec l'entrée de la pompe à jet 160.Conversely, when the fuel pressure on the inlet of the regulator 170 exceeds the force of the spring 173, the membrane 172 and the spring 173 are deformed. The shutter 174 is detached from the seat 175. And fuel can flow towards the outlet of the regulator 170 which communicates with the inlet of the jet pump 160.
Plus précisément encore, la sortie du régulateur 170 communique avec l'entrée d'un gicleur 162.More precisely still, the output of the regulator 170 communicates with the input of a nozzle 162.
La pompe à jet 160 comporte en outre un conduit d'aspiration 164 qui communique avec le fond du réservoir 10 et dont la sortie débouche dans le corps de la pompe à jet 160 en aval du gicleur 162.The jet pump 160 also comprises a suction duct 164 which communicates with the bottom of the tank 10 and the outlet of which opens into the body of the jet pump 160 downstream of the nozzle 162.
La sortie de la pompe à jet 160 débouche elle-même à l'intérieur du bol 150.The outlet of the jet pump 160 itself opens into the bowl 150.
De préférence la sortie de la pompe à jet 160 est associée à des moyens permettant de dégazer le carburant avant qu'il n'atteigne le bol de réserve 150.Preferably, the outlet of the jet pump 160 is associated with means making it possible to degas the fuel before it reaches the reserve bowl 150.
Ainsi comme on l'a illustré sur la figure 1 , on peut prévoir un muret 154 en regard de la sortie de la pompe à jet 160. Ce muret 154 est relié de manière étanche latéralement et à sa base aux parois formant le bol de réserve 150. Le carburant issu de la pompe à jet 160 vient ainsi heurter le muret 154. De ce fait, les bulles d'air éventuellement véhiculées avec le carburant dans la pompe à jet 160, sont cassées. Le carburant atteint le bol de réserve 150 proprement dit par débordement au dessus du muret 154. Le muret 154 définit ainsi le niveau maximal à l'intérieur du bol de réserve 150 à l'état non alimenté de la pompe à jet 160.Thus, as illustrated in FIG. 1, a wall 154 can be provided opposite the outlet of the jet pump 160. This wall 154 is tightly connected laterally and at its base to the walls forming the reserve bowl 150. The fuel coming from the jet pump 160 thus strikes the wall 154. As a result, the air bubbles possibly conveyed with the fuel in the jet pump 160, are broken. The fuel reaches the reserve bowl 150 proper by overflowing above the wall 154. The wall 154 thus defines the maximum level inside the reserve bowl 150 in the unpowered state of the jet pump 160.
En variante un tel muret 154 peut être remplacé par un colimaçon à fond ascendant dont l'entrée est placée en regard de la sortie de la pompe à jet 160 et dont la sortie débouche dans le bol de réserve 150. Dans ce cas le carburant est dégazé progressivement lors de son écoulement sur ce colimaçon.As a variant, such a low wall 154 can be replaced by a spiral with an ascending bottom, the inlet of which is placed opposite the outlet of the jet pump 160 and the outlet of which opens into the reserve bowl 150. In this case the fuel is degassed gradually during its flow on this spiral.
Selon une variante de réalisation, l'entrée du régulateur 170 reliée en sortie du filtre fin secondaire 130 selon la figure 1 pourrait être reliée en amont du filtre fin 130.According to an alternative embodiment, the input of the regulator 170 connected at the output of the secondary fine filter 130 according to FIG. 1 could be connected upstream of the fine filter 130.
On a représenté sur la figure 2, un mode de réalisation d'une telle intégration du régulateur de pression 170 et de la pompe à jet 160.FIG. 2 shows an embodiment of such an integration of the pressure regulator 170 and the jet pump 160.
On retrouve sur cette figure 2 la paroi du bol de réserve 150, le filtre fin secondaire 130 disposé dans un boîtier 131 , le régulateur 170 comprenant un boîtier 171 , une membrane 172 associée à un ressort 173 et qui porte un obturateur 174 coopérant avec un siège 175, ainsi que la pompe à jet 160 comportant un gicleur 162 et un conduit d'aspiration 164.This FIG. 2 shows the wall of the reserve bowl 150, the secondary fine filter 130 disposed in a housing 131, the regulator 170 comprising a housing 171, a membrane 172 associated with a spring 173 and which carries a shutter 174 cooperating with a seat 175, as well as the jet pump 160 comprising a nozzle 162 and a suction duct 164.
On notera que selon le mode de réalisation particulier représenté sur la figure 2, l'obturateur 174 porté par la membrane 172 est formé d'une bille sphérique.Note that according to the particular embodiment shown in Figure 2, the shutter 174 carried by the membrane 172 is formed of a spherical ball.
On notera également à l'examen de la figure 2 que le siège 175 et le gicleur 162 sont formés aux extrémités d'une pièce unique réalisée de préférence par tournage.It will also be noted on examining FIG. 2 that the seat 175 and the nozzle 162 are formed at the ends of a single piece preferably produced by turning.
En pratique, la géométrie du corps de la pompe à jet 160 (convergent, divergent) peut faire l'objet de nombreuses variantes selon les caractéristiques de pompe recherchées.In practice, the geometry of the body of the jet pump 160 (convergent, divergent) can be the subject of numerous variants depending on the characteristics of the pump sought.
Pour ces raisons, la réalisation particulière de la pompe à jet 160 illustrée sur la figure 2 annexée, ne sera pas décrite dans le détail par la suite. On notera cependant également la présence de joints toriques d'étanchéité, plus précisément d'un premier joint 180 entre la sortie du filtre fin 130 et la paroi du bol 150 communiquant avec l'entrée du régulateur de pression 170, d'un second joint 182 entre le boîtier 170 du régulateur de pression et la paroi du bol de réserve 150 et enfin d'un troisième joint d'étanchéité 184 autour du gicleur 162, entre celui-ci et le corps de la pompe à jet 160.For these reasons, the particular embodiment of the jet pump 160 illustrated in the appended FIG. 2 will not be described in detail below. However, note also the presence of O-rings, more specifically a first seal 180 between the outlet of the fine filter 130 and the wall of the bowl 150 communicating with the inlet of the pressure regulator 170, a second seal 182 between the housing 170 of the regulator pressure and the wall of the reserve bowl 150 and finally of a third seal 184 around the nozzle 162, between the latter and the body of the jet pump 160.
Selon le mode de réalisation illustré sur la figure 2, la pompe à jet 160 a son axe horizontal.According to the embodiment illustrated in Figure 2, the jet pump 160 has its horizontal axis.
On aperçoit sur la figure 3, une variante de réalisation dans laquelle le régulateur de pression 170 et la pompe à jet 160 sont constitués des mêmes moyens que ceux illustrés sur la figure 2 et précédemment décrits. Cependant, selon la variante de la figure 3, la pompe à jet 160 (ainsi que le régulateur 170) a son axe incliné sur l'horizontal en rapprochement du fond 12 du réservoir en direction de la sortie du gicleur 162.We see in Figure 3, an alternative embodiment in which the pressure regulator 170 and the jet pump 160 are constituted by the same means as those illustrated in Figure 2 and previously described. However, according to the variant of FIG. 3, the jet pump 160 (as well as the regulator 170) has its axis inclined on the horizontal in approach to the bottom 12 of the tank in the direction of the outlet of the nozzle 162.
Cette disposition permet de réduire la hauteur d'aspiration et d'amorçage de la pompe à jet 160. De manière non limitative, l'axe de la pompe à jet 160 peut ainsi être incliné typiquement de l'ordre de 18° sur l'horizontal.This arrangement makes it possible to reduce the suction and priming height of the jet pump 160. Without limitation, the axis of the jet pump 160 can thus be inclined typically of the order of 18 ° on the horizontal.
Cette disposition permet typiquement de réduire la hauteur d'amorçage de la pompe à jet 160 à une hauteur A de l'ordre de 6,4mm pour la variante de réalisation illustrée sur la figure 3 par rapport à une hauteur d'amorçage A de l'ordre de 15,7mm pour le mode de réalisation illustré sur la figure 2.This arrangement typically makes it possible to reduce the priming height of the jet pump 160 to a height A of the order of 6.4 mm for the variant embodiment illustrated in FIG. 3 relative to a priming height A of l order of 15.7 mm for the embodiment illustrated in FIG. 2.
Selon une autre caractéristique avantageuse de la présente invention, la pompe à jet 160 peut comprendre un gicleur de section variable. II peut s'agir par exemple d'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, telle que proposée par la Demanderesse dans sa demande de brevet déposée en France le 26 septembre 1996 sous le n° 96 11739.According to another advantageous characteristic of the present invention, the jet pump 160 can comprise a nozzle of variable section. It may for example be a jet pump in which the nozzle which receives the injected flow is formed by a nozzle composed of several lips made of elastic material adapted so that the nozzle has a variable section according to the pressure and the injected flow, as proposed by the Applicant in its patent application filed in France on September 26, 1996 under No. 96 11739.
Selon une autre variante, il peut s'agir comme illustré sur les figures 4 et 5, d'une pompe à jet 160 comprenant un gicleur 162 et un noyau 165 montés à déplacement en regard de la buse de sortie du gicleur 162, et en aval de celle-ci.According to another variant, it may be, as illustrated in FIGS. 4 and 5, a jet pump 160 comprising a nozzle 162 and a core 165 mounted displacement opposite the outlet nozzle of the nozzle 162, and downstream thereof.
Selon encore une autre variante comme illustré sur la figure 5, le noyau 165 peut être muni d'un canal longitudinal traversant 166 formant un gicleur auxiliaire.According to yet another variant as illustrated in FIG. 5, the core 165 can be provided with a longitudinal through channel 166 forming an auxiliary nozzle.
Le noyau 165 peut être guidé à translation selon l'axe de la pompe à jet 160 par tous moyens connus appropriés. Bien entendu, ces moyens de guidage ne doivent pas perturber le flux de carburant issu du gicleur 162 et aspirer par le conduit d'aspiration 164. On notera que le noyau 165 est sollicité vers la sortie du gicleur 162 par un ressort taré 167.The core 165 can be guided in translation along the axis of the jet pump 160 by any suitable known means. Of course, these guide means must not disturb the flow of fuel from the nozzle 162 and suck through the suction pipe 164. It will be noted that the core 165 is biased towards the outlet of the nozzle 162 by a calibrated spring 167.
De préférence, le noyau 165 repose sur l'extrémité libre du gicleur 162 sous forme d'une zone limitée sensiblement à une arête circulaire ou sur une génératrice de contact définie sur le gicleur 162. Cependant la géométrie particulière de l'extrémité du gicleur 162 et du tronçon de noyau 165 reposant sur celui-ci peut faire l'objet de nombreuses variantes de réalisation décrites dans une demande de brevet parallèle déposée au nom de la Demanderesse. Pour ces raisons, ces différents modes de réalisation ainsi que la structure détaillée de la pompe à jet à noyau illustrée sur les figures 4 et 5 ne sera pas décrite dans le détail par la suite.Preferably, the core 165 rests on the free end of the nozzle 162 in the form of an area limited substantially to a circular edge or on a contact generator defined on the nozzle 162. However, the particular geometry of the end of the nozzle 162 and the core section 165 resting thereon can be the subject of numerous variant embodiments described in a parallel patent application filed in the name of the Applicant. For these reasons, these different embodiments as well as the detailed structure of the core jet pump illustrated in FIGS. 4 and 5 will not be described in detail below.
Le fonctionnement de la pompe à jet illustré sur la figure 4 est essentiellement le suivant.The operation of the jet pump illustrated in FIG. 4 is essentially the following.
Pour les plus faibles débits injectés, la section d'éjection, c'est-à- dire la section libre du gicleur 162 est réduite et permet d'augmenter la puissance transmise à la pompe à jet par une pression d'injection élevée.For the lower injected flow rates, the ejection section, that is to say the free section of the nozzle 162 is reduced and makes it possible to increase the power transmitted to the jet pump by a high injection pressure.
Pour des débits de retour élevés, le noyau 165 recule par compression du ressort 167, par rapport au gicleur 162 ce qui permet d'augmenter la section de passage en sortie du gicleur 162 et de limiter la contre pression en amont du gicleur 162 à un niveau acceptable.For high return flow rates, the core 165 moves back by compression of the spring 167, with respect to the nozzle 162 which makes it possible to increase the passage section at the outlet of the nozzle 162 and to limit the back pressure upstream of the nozzle 162 to a acceptable level.
Le fonctionnement de la pompe à jet illustrée sur la figure 5 est essentiellement le suivant. Lorsque le débit en sortie du régulateur de pression 170, soit sur l'entrée de la pompe à jet 160 est nulle, il en est de même pour le débit dans l'entrée d'aspiration 164 et pour le débit à la sortie de cette pompe à jet. Dans ce cas, le noyau 165 repose sur l'extrémité du gicleur 162. Lorsque le débit injecté dans l'entrée de la pompe à jet 160 par la sortie du régulateur de pression est faible, la contre pression demeure en deçà du seuil de pression d'ouverture du noyau 165 (fonction du tarage du ressort de compression 167) ce qui localise l'injection à travers le gicleur auxiliaire formé par le canal longitudinal 166 du noyau 165. 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 165.The operation of the jet pump illustrated in FIG. 5 is essentially as follows. When the flow rate at the outlet of the pressure regulator 170, ie on the inlet of the jet pump 160 is zero, the same is true for the flow rate in the suction inlet 164 and for the flow rate at the outlet of this jet pump. In this case, the core 165 rests on the end of the nozzle 162. When the flow rate injected into the inlet of the jet pump 160 through the outlet of the pressure regulator is low, the back pressure remains below the pressure threshold opening the core 165 (depending on the setting of the compression spring 167) which localizes the injection through the auxiliary nozzle formed by the longitudinal channel 166 of the core 165. The Venturi effect is then produced in a conventional manner and the flow transferred is collected through the mixing tube located downstream of the core 165.
Lorsque le débit injecté dans l'entrée de la pompe augmente, la contre pression passe au-dessus du seuil de pression et le noyau 165 recule progressivement par déformation du ressort 167, libérant une section de passage annulaire entre le noyau 165 et le gicleur 162. Cette décharge permet de limiter l'augmentation de pression au-dessus du seuil d'ouverture pour les forts débits injectés, tout en garantissant un effet Venturi secondaire en sortie du gicleur 162, ce qui contribue à l'augmentation du débit aspiré à travers l'entrée 164, après recul du noyau 165. Bien entendu la présente invention n'est pas limitée aux modes de réalisation particuliers qui viennent d'être décrits, mais s'étend à toutes variantes conformes à son esprit.When the flow rate injected into the inlet of the pump increases, the back pressure passes above the pressure threshold and the core 165 gradually recedes by deformation of the spring 167, freeing an annular passage section between the core 165 and the nozzle 162 This discharge makes it possible to limit the increase in pressure above the opening threshold for the high injected flows, while guaranteeing a secondary Venturi effect at the outlet of the nozzle 162, which contributes to the increase in the flow sucked through the entry 164, after the core 165 has retreated. Of course, the present invention is not limited to the particular embodiments which have just been described, but extends to all variants in accordance with its spirit.
Ainsi, selon une variante de réalisation, on peut prévoir d'utiliser une partie de la paroi du bol de réserve sous forme de coquille pour former une partie du boîtier 171 du régulateur de pression 170, ou encore de rapporter le boîtier 171 d'un régulateur de pression classique à l'intérieur d'un verso formé par cette paroi du bol de réserve 150.Thus, according to an alternative embodiment, provision may be made to use a part of the wall of the reserve bowl in the form of a shell to form a part of the housing 171 of the pressure regulator 170, or else to add the housing 171 of a conventional pressure regulator inside a back formed by this wall of the reserve bowl 150.
On notera que de préférence, l'ensemble de puisage de carburant conforme à la présente invention est en outre équipé de moyens de jaugeage de niveau de carburant dans le réservoir 10 classiques en soi. It will be noted that preferably, the fuel drawing assembly in accordance with the present invention is further equipped with means for gauging the level of fuel in the tank 10 conventional per se.

Claims

REVENDICATIONS
1. Ensemble de puisage de carburant pour réservoir de véhicule automobile comprenant un pompe principale (110) associée à un régulateur de pression (170) et un bol de réserve (150) alimenté par une pompe à jet (160) et dans lequel aspire la pompe principale (110), caractérisé par le fait que la pompe à jet (160) est intégrée en sortie du régulateur de pression (170) et que le sous ensemble pompe à jet (160)/régulateur (170) ainsi formé est solidaire d'un module (100) comportant la pompe principale (110) et le bol de réserve (150), une partie du boîtier (171 ) de régulateur de pression (170) étant intégrée à la paroi composant le bol de réserve (150).1. Fuel drawing assembly for a motor vehicle tank comprising a main pump (110) associated with a pressure regulator (170) and a reserve bowl (150) supplied by a jet pump (160) and into which the main pump (110), characterized in that the jet pump (160) is integrated at the outlet of the pressure regulator (170) and that the jet pump (160) / regulator (170) sub-assembly thus formed is integral with 'A module (100) comprising the main pump (110) and the reserve bowl (150), a part of the housing (171) of pressure regulator (170) being integrated into the wall composing the reserve bowl (150).
2. Ensemble selon la revendication 1 , caractérisé par le fait que la pompe à jet (160) a son axe horizontal.2. Assembly according to claim 1, characterized in that the jet pump (160) has its horizontal axis.
3. Ensemble selon la revendication 1 , caractérisé par le fait que la pompe à jet (160) a son axe incliné sur l'horizontal, convergent vers le fond du réservoir (10) en direction de la sortie du gicleur (160) de pompe à jet.3. Assembly according to claim 1, characterized in that the jet pump (160) has its axis inclined to the horizontal, converging towards the bottom of the tank (10) in the direction of the outlet of the pump nozzle (160) jet.
4. Ensemble selon l'une des revendications 1 à 3, caractérisé par le fait qu'un filtre fin (130) est associé à la sortie de la pompe principale (110).4. Assembly according to one of claims 1 to 3, characterized in that a fine filter (130) is associated with the outlet of the main pump (110).
5. Ensemble selon la revendication 4, caractérisé par le fait que le filtre fin (130) est de type annulaire et disposé autour de la pompe principale5. Assembly according to claim 4, characterized in that the fine filter (130) is of annular type and arranged around the main pump
(110).(110).
6. Ensemble selon l'une des revendications 1 à 5, caractérisé par le fait que le régulateur (170) comporte une membrane (172) soumise à des efforts antagonistes, d'une part d'un ressort taré (173), et d'autre part de la pression de carburant issue de la pompe principale (110).6. Assembly according to one of claims 1 to 5, characterized in that the regulator (170) comprises a membrane (172) subjected to antagonistic forces, on the one hand of a calibrated spring (173), and d 'other part of the fuel pressure from the main pump (110).
7. Ensemble selon l'une des revendications 1 à 6, caractérisé par le fait que la pompe à jet (160) comporte un gicleur (162) dont l'entrée est reliée à la sortie du régulateur de pression (170) et d'un conduit d'aspiration (164) qui communique avec le fond du réservoir (10) et qui débouche dans le corps de la pompe à jet (160) en aval du gicleur (162).7. Assembly according to one of claims 1 to 6, characterized in that the jet pump (160) comprises a nozzle (162) whose inlet is connected to the outlet of the pressure regulator (170) and a suction duct (164) which communicates with the bottom of the tank (10) and which opens into the body of the jet pump (160) downstream of the nozzle (162).
8. Ensemble selon l'une des revendications 1 à 7, caractérisé par le fait que la pompe à jet (160) comporte un obturateur (174) formé d'une bille. 8. Assembly according to one of claims 1 to 7, characterized in that the jet pump (160) comprises a shutter (174) formed of a ball.
9. Ensemble selon l'une des revendications 1 à 8, caractérisé par le fait que le siège (175) du régulateur de pression (170) et le gicleur (162) de la pompe à jet sont formés aux extrémités d'une pièce commune.9. Assembly according to one of claims 1 to 8, characterized in that the seat (175) of the pressure regulator (170) and the nozzle (162) of the jet pump are formed at the ends of a common part .
10. Ensemble selon l'une des revendications 1 à 9, caractérisé par le fait que la pompe à jet (160) comprend un noyau (165) monté en déplacement en regard de la buse de sortie du gicleur et en aval de celle-ci.10. Assembly according to one of claims 1 to 9, characterized in that the jet pump (160) comprises a core (165) mounted in displacement opposite the outlet nozzle of the nozzle and downstream of the latter .
11. Ensemble selon la revendication 10, caractérisé par le fait que le noyau (165) est sollicité par un ressort (167) contre la sortie du gicleur (162). 11. The assembly of claim 10, characterized in that the core (165) is biased by a spring (167) against the outlet of the nozzle (162).
12. Ensemble selon l'une des revendications 10 ou 1 , caractérisé par le fait que le noyau (165) est muni d'un canal longitudinal traversant (166) formant un gicleur auxiliaire.12. Assembly according to one of claims 10 or 1, characterized in that the core (165) is provided with a through longitudinal channel (166) forming an auxiliary nozzle.
13. Ensemble selon l'une des revendications 1 à 12, caractérisé par le fait que la sortie de la pompe à jet (160) est associée à des moyens permettant de dégazer le carburant avant qu'il n'atteigne le bol de réserve (150).13. Assembly according to one of claims 1 to 12, characterized in that the outlet of the jet pump (160) is associated with means making it possible to degas the fuel before it reaches the reserve bowl ( 150).
14. Ensemble selon la revendication 13, caractérisé par le fait que les moyens de dégazage comprennent un muret (154) placé en regard de la sortie de la pompe à jet (160) et adapté pour autoriser un remplissage du bol de réserve (150) par débordement.14. The assembly of claim 13, characterized in that the degassing means comprise a wall (154) placed opposite the outlet of the jet pump (160) and adapted to allow filling of the reserve bowl (150) by overflow.
15. Ensemble selon la revendication 13, caractérisé par le fait que les moyens de dégazage comprennent un colimaçon.15. The assembly of claim 13, characterized in that the degassing means comprise a spiral.
16. Réservoir de carburant pour véhicule automobile, caractérisé par le fait qu'il est équipé d'un ensemble de puisage conforme à l'une des revendications 1 à 15. 16. Fuel tank for a motor vehicle, characterized in that it is equipped with a drawing assembly according to one of claims 1 to 15.
EP99920912A 1998-05-26 1999-05-25 Assembly for transferring fuel from a motor vehicle tank Expired - Lifetime EP1084342B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9806589A FR2779184B1 (en) 1998-05-26 1998-05-26 FUEL PUMP ASSEMBLY IN A MOTOR VEHICLE TANK
FR9806589 1998-05-26
PCT/FR1999/001216 WO1999061777A1 (en) 1998-05-26 1999-05-25 Assembly for transferring fuel from a motor vehicle tank

Publications (2)

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EP1084342A1 true EP1084342A1 (en) 2001-03-21
EP1084342B1 EP1084342B1 (en) 2002-08-14

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EP (1) EP1084342B1 (en)
JP (1) JP2002516950A (en)
BR (1) BR9910705A (en)
DE (1) DE69902533T2 (en)
FR (1) FR2779184B1 (en)
WO (1) WO1999061777A1 (en)

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FR2779184A1 (en) 1999-12-03
US6502558B1 (en) 2003-01-07
JP2002516950A (en) 2002-06-11
EP1084342B1 (en) 2002-08-14
BR9910705A (en) 2001-01-30
DE69902533T2 (en) 2002-12-19
WO1999061777A1 (en) 1999-12-02
DE69902533D1 (en) 2002-09-19
FR2779184B1 (en) 2001-01-26

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