Classifications

• • 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
• • 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
  • F02M37/04—Feeding by means of driven pumps
  • F02M37/08—Feeding by means of driven pumps electrically driven
  • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
  • F02M37/106—Feeding 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)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9526698

Family Applications (1)

Country Status (7)

Families Citing this family (34)

Family Cites Families (18)

• 1998
  • 1998-05-26 FR FR9806589A patent/FR2779184B1/fr not_active Expired - Lifetime
• 1999
  • 1999-05-25 DE DE69902533T patent/DE69902533T2/de not_active Expired - Lifetime
  • 1999-05-25 EP EP99920912A patent/EP1084342B1/de not_active Expired - Lifetime
  • 1999-05-25 BR BR9910705-8A patent/BR9910705A/pt unknown
  • 1999-05-25 WO PCT/FR1999/001216 patent/WO1999061777A1/fr not_active Ceased
  • 1999-05-25 JP JP2000551140A patent/JP2002516950A/ja active Pending
  • 1999-05-25 US US09/701,441 patent/US6502558B1/en not_active Expired - Lifetime

Non-Patent Citations (1)

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