EP0344063A1 - Entgasungsvorrichtung des Brennstoffzufuhrs einer Brennkraftmaschine - Google Patents

Entgasungsvorrichtung des Brennstoffzufuhrs einer Brennkraftmaschine Download PDF

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Publication number
EP0344063A1
EP0344063A1 EP89401412A EP89401412A EP0344063A1 EP 0344063 A1 EP0344063 A1 EP 0344063A1 EP 89401412 A EP89401412 A EP 89401412A EP 89401412 A EP89401412 A EP 89401412A EP 0344063 A1 EP0344063 A1 EP 0344063A1
Authority
EP
European Patent Office
Prior art keywords
fuel
tank
valve
degassing device
return pipe
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
EP89401412A
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English (en)
French (fr)
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EP0344063B1 (de
Inventor
Stéphane Constantinidis
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.)
Rivapompe SA
Original Assignee
Rivapompe SA
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Filing date
Publication date
Application filed by Rivapompe SA filed Critical Rivapompe SA
Publication of EP0344063A1 publication Critical patent/EP0344063A1/de
Application granted granted Critical
Publication of EP0344063B1 publication Critical patent/EP0344063B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • 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
    • F02M37/20—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 characterised by means for preventing vapour lock
    • 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
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators

Definitions

  • the supply fuel In internal combustion engines, the supply fuel must reach the carburetor free of any vapor or gas and at a temperature compatible with the fuel metering organ with the intake air.
  • a fuel degassing device which comprises a decantation tank and a cover body tightly fixed on the decantation tank, said cover body being provided with a fuel inlet pipe, a gas and vapor return pipe to the tank, located in an upper part of the cover and an outlet pipe for the evacuation of the degassed liquid fuel towards the carburetor, and in which is mounted a valve loaded by a calibrated spring, which keeps the valve applied against a first seat as long as the settling tank contains gas, this then escaping towards the return pipe to the tank through low-loss passages load which by-pass the valve, while, when the settling tank is completely filled with liquid fuel, the valve is biased against the force of the spring, towards a closed position on a second seat o where it closes the return line to the tank.
  • a first separation between the liquid phase and the gas phase of the fuel takes place under the effect of the impact of the incident flow of fuel on a deflector, then the fuel gets rid of another part of the gases which it contains by passing through a cylindrical filter cartridge.
  • a fuel supply system for an internal combustion machine which comprises a gas separator, a recycling duct connected to the pressure outlet of a circulation pump and a Venturi tube arranged in the recycling duct to create a positive pressure drop between the interior space of the gas separator and the recycling duct, so that the gas coming from said space is sucked by the Venturi.
  • the separator according to said patent is connected between the tank and the pump, its main function being to send gas-free fuel to the pump. But as we know, this can cause the formation of gases or emulsions at the outlet.
  • GB-A-2 157 803 discloses a gas separator which comprises a valve constituted by a ball which, when in the high position, completely closes the orifice of the return pipe to the tank.
  • the present invention provides a degassing device according to the preamble of claim 1, and which is much simpler, more effective and economical than the devices of the technique described above.
  • This device is characterized by the following points: - the inlet manifold has in said cover a portion of narrowed diameter in which the fuel undergoes an acceleration, and which is extended by a portion which makes the fuel penetrate into the settling tank tangentially to the wall thereof, - downstream of the valve and in the return pipe to the tank is mounted a nozzle to which part of the incident fuel flow is derived by a channel connected to the inlet tubing, said nozzle creating a vacuum at the inlet of the return tubing.
  • the settling tank according to the invention is much simpler and economical than the separator according to patent DE-A-1 235 067 since it only has three connections instead of four. Another important difference is that the settling tank is mounted between the pump and the engine and therefore sends liquid fuel to the latter free of air bubbles and gases.
  • the settling tank is divided into two superposed stages, by a separating element in the form of an overturned funnel, the conical part of which defines with the internal wall of the tank a small interval for the 'flow of fuel from the inlet manifold, and the tubular part of which adapts to the upper part of the cover body, orifices being provided at the end of the tubular part to allow the evacuation of the gases s' accumulating in the upper stage towards the return pipe to the tank.
  • Said separating element is closed at its narrowed end by a wall pierced with a calibrated hole for the evacuation of gases accumulating in the lower stage.
  • a filter with suitable mesh intended to separate the last gas bubbles from the fuel, the degassed fuel being under the filter being sucked towards the outlet pipe by a cannula whose lower end crosses the filter tightly and dives into the fuel.
  • the valve is pierced with a calibrated orifice allowing a low rate of fuel leakage towards the return pipe when the valve is in the closed position.
  • the device according to the invention therefore performs degassing in three stages: - a first separation due to the acceleration of the die bit of fuel, then when it relaxes in the settling tank, where it is projected tangentially to the wall.
  • the fuel undergoes a thermal shock by cicuring on said wall, which promotes the separation of gases; - the suction of gases by the vacuum created by the nozzle; - the residual gases and vapors are channeled through the funnel towards the return pipe to the tank.
  • the degassing device 10 comprises a settling tank 11 and a cover body 12, made of a light metal or a synthetic material capable of withstanding the temperatures prevailing under the engine hood.
  • the tank and the cover body can be assembled in various ways. For example, if the tank is made of metal, assembly can be carried out, as shown in FIG. 1, by crimping its upper edge 14 on a flange 16 formed on the periphery of the edge of the cover body, an O-ring 18 sealing. If the tank and the cover are made of synthetic material, they can be welded edge to edge, for example by the rotary process.
  • dome-shaped element 26 intended to recover the gases and vapors inside the tank and to bring them back to the tube 24 back to the tank.
  • said dome-shaped element is constituted by a disc having a concave lower face 28, for example with a slight taper centered on the axis of the tank.
  • Said element 26 is pierced in its center with an axial orifice 30 which communicates with the return pipe 24. It has a flat upper face 32 which bears against the internal face of the cover body, and a projecting peripheral edge 34 which is clamped between the edge 16 of the cover and a shoulder formed on the upper edge of the settling tank.
  • the inlet pipe 20 has a vertical portion 36 of narrowed diameter drilled in the element 26, in which the fuel accelerates.
  • the portion 36 is extended by a substantially horizontal portion 38 oriented so that the outgoing jet of fuel strikes the internal wall of the tank under a substantially tangential incidence.
  • the interior of the settling tank is divided into two stages by a deflector 40 in the form of an inverted funnel and of the same axis as the tank.
  • the deflector comprises a frustoconical part 42 whose flared edge leaves a slight clearance with the inner wall of the tank. Said edge comprises for this purpose a plurality of protrusions 44 regularly spaced in contact with the wall of the tank, and which define with the latter narrow passages 46 in the form of an arc.
  • the frustoconical part is extended by a tubular part 48 provided at its upper end with hooks 50 which snap onto shoulders provided in the axial orifice 30 of the element 26.
  • the deflector 40 thus defines a stage upper annular 52 and a lower stage 54.
  • the vapors and gases being in the upper stage can flow towards the return orifice 24 by several calibrated tangential orifices 56 formed at the upper end of the tubular part 48 of the deflector.
  • the latter is closed by a wall pierced with an orifice 58 through which the vapors and gases forming in the lower stage are discharged.
  • a small portion of the effluent fuel flow is diverted from the inlet pipe 20 through a narrow channel 60 to a nozzle 62 which is mounted in the return pipe 24.
  • the fuel mixture jet leaving the nozzle creates a depression at the inlet of the return pipe which sucks the gases and vapors forming in the two stages of the tank.
  • a valve 64 is slidably mounted between a low position (right part of FIG. 3) where it is applied against a first seat 66 secured to the element 26 and a high position (left part of FIG. 3) where it is applied against a second seat 68 located at the entrance to the return pipe.
  • the valve struggles in a bore 70 provided with vertical grooves 72 which by-pass the valve when the latter is in the low position. These grooves offer different pressure drop passages for the liquid and gas phases.
  • the valve is calibrated by a spring 74 which keeps it normally applied against the seat 66 as long as the pressure downstream of the valve is less than a predetermined pressure. It has a central orifice calibrated 76 through which a low flow rate of liquid fuel leakage can escape when the valve is in its high position.
  • a filter 78 with a suitable mesh used to separate the last gas bubbles which may remain.
  • the degassed fuel flows to the bottom of the tank and is sucked in through a tube 80 connected to the outlet pipe.
  • the operation of the degassing device according to the invention will now be explained.
  • the fuel pushed by the pump enters the device through the inlet manifold 20.
  • Part of the flow is diverted to the nozzle 62 via the channel 60, from where it returns to the tank via the return manifold 24.
  • this fraction of the flow creates a depression which sucks the gases and vapors forming in the upper stages 52 and lower 54.
  • the rest of the fuel undergoes a deceleration in the vertical pipe, then a sudden increase in speed in the portion horizontal 38 of smaller diameter, which creates a gas mixture which expands in the upper stage 52.
  • a first gas separation takes place at this level.
  • the gaseous mixture is projected tangentially to the hot wall of the tank where it undergoes a thermal shock which still releases gases and vapors contained in the fuel. This separation continues under the effect of the vortex movement of the fuel and the centrifugal force.
  • the gases accumulate towards the highest part of the concave element 26 and are evacuated through the orifices 56 and the valve 64 towards the return pipe 24.
  • the liquid fuel practically free of gas, continues its rotational movement and passes to the lower stage 54.
  • the last fraction of gas accumulates in the deflector and is discharged through the orifice 58 towards the valve 64 and the return pipe. .
  • a non-return valve 82 can be integrated in the outlet pipe 22, in the case where the height or the distance between the carburetor and the device is large.
  • the valve has a triangular section with rounded ends ( Figure 5) and struggles in a cylindrical bore 84 circumscribed to the valve, so that passages 86 are defined for the flow of liquid fuel.
  • the valve At rest, the valve is supported under the action of its own weight on a first seat 88 (left part of Figure 5), while when degassed fuel flows, it is lifted and applied against a second seat 90 (right part of Figure 5) located at the entrance to the return pipe 22 which it only partially closes.
  • the element 26 can be made in one piece with the body of the cover.
  • the underside of the cover is concave.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
EP19890401412 1988-05-25 1989-05-24 Entgasungsvorrichtung des Brennstoffzufuhrs einer Brennkraftmaschine Expired - Lifetime EP0344063B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8806941 1988-05-25
FR8806941A FR2632018B1 (fr) 1988-05-25 1988-05-25 Dispositif de degazage a haute efficacite d'un carburant d'alimentation de moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP0344063A1 true EP0344063A1 (de) 1989-11-29
EP0344063B1 EP0344063B1 (de) 1992-01-08

Family

ID=9366590

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890401412 Expired - Lifetime EP0344063B1 (de) 1988-05-25 1989-05-24 Entgasungsvorrichtung des Brennstoffzufuhrs einer Brennkraftmaschine

Country Status (4)

Country Link
EP (1) EP0344063B1 (de)
DE (1) DE68900671D1 (de)
ES (1) ES2029121T3 (de)
FR (1) FR2632018B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU609960B2 (en) * 1988-04-11 1991-05-09 Outboard Marine Corporation Vapor separator
EP0578484A1 (de) * 1992-07-09 1994-01-12 Ford Motor Company Limited Kraftstoffansaugvorrichtung und -sammelbehälter für Motor mit innerer Verbrennung
FR2783019A1 (fr) * 1998-09-04 2000-03-10 Renault Circuit d'alimentation en carburant pour moteur a combustion interne
EP1015755A2 (de) * 1996-08-22 2000-07-05 Jose M. Gonzalez Brennstoff-dampfabscheider für dieselmotoren

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1235067B (de) * 1959-05-13 1967-02-23 Continental Motors Corp Brennstoffversorgungssystem fuer Brennkraftmaschinen
DE1979410U (de) * 1966-07-16 1968-02-22 Daimler Benz Ag Brennstoff-foerdereinrichtung fuer einspritzbrennkraftmaschinen.
US4079717A (en) * 1975-06-23 1978-03-21 Nissan Motor Company, Ltd. Fuel injection system of internal combustion engine
DE8522528U1 (de) * 1985-08-05 1985-10-10 Jenbacher Werke Vertriebsgesellschaft mbH, 7016 Gerlingen Vorrichtung zum selbsttätigen Entlüften von Kraftstoffleitungen von Dieselmotoren
GB2157803A (en) * 1984-04-25 1985-10-30 Facet Enterprises Vent-relief valve for a wet motor gerotor fuel pump
DE3530970A1 (de) * 1985-08-30 1987-05-07 Vdo Schindling Kraftstoffanlage

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1235067B (de) * 1959-05-13 1967-02-23 Continental Motors Corp Brennstoffversorgungssystem fuer Brennkraftmaschinen
DE1979410U (de) * 1966-07-16 1968-02-22 Daimler Benz Ag Brennstoff-foerdereinrichtung fuer einspritzbrennkraftmaschinen.
US4079717A (en) * 1975-06-23 1978-03-21 Nissan Motor Company, Ltd. Fuel injection system of internal combustion engine
GB2157803A (en) * 1984-04-25 1985-10-30 Facet Enterprises Vent-relief valve for a wet motor gerotor fuel pump
DE8522528U1 (de) * 1985-08-05 1985-10-10 Jenbacher Werke Vertriebsgesellschaft mbH, 7016 Gerlingen Vorrichtung zum selbsttätigen Entlüften von Kraftstoffleitungen von Dieselmotoren
DE3530970A1 (de) * 1985-08-30 1987-05-07 Vdo Schindling Kraftstoffanlage

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU609960B2 (en) * 1988-04-11 1991-05-09 Outboard Marine Corporation Vapor separator
EP0578484A1 (de) * 1992-07-09 1994-01-12 Ford Motor Company Limited Kraftstoffansaugvorrichtung und -sammelbehälter für Motor mit innerer Verbrennung
EP1015755A2 (de) * 1996-08-22 2000-07-05 Jose M. Gonzalez Brennstoff-dampfabscheider für dieselmotoren
EP1015755A4 (de) * 1996-08-22 2000-10-18 Jose M Gonzalez Brennstoff-dampfabscheider für dieselmotoren
FR2783019A1 (fr) * 1998-09-04 2000-03-10 Renault Circuit d'alimentation en carburant pour moteur a combustion interne

Also Published As

Publication number Publication date
ES2029121T3 (es) 1992-07-16
FR2632018B1 (fr) 1993-12-24
EP0344063B1 (de) 1992-01-08
FR2632018A1 (fr) 1989-12-01
DE68900671D1 (de) 1992-02-20

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