ITMI20102310A1 - PUMPING GROUP FOR FOOD FUEL, PREFERIBLY GASOIL, FROM A CONTAINMENT TANK TO AN INTERNAL COMBUSTION ENGINE - Google Patents

PUMPING GROUP FOR FOOD FUEL, PREFERIBLY GASOIL, FROM A CONTAINMENT TANK TO AN INTERNAL COMBUSTION ENGINE Download PDF

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Publication number
ITMI20102310A1
ITMI20102310A1 IT002310A ITMI20102310A ITMI20102310A1 IT MI20102310 A1 ITMI20102310 A1 IT MI20102310A1 IT 002310 A IT002310 A IT 002310A IT MI20102310 A ITMI20102310 A IT MI20102310A IT MI20102310 A1 ITMI20102310 A1 IT MI20102310A1
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IT
Italy
Prior art keywords
branch
fuel
venturi effect
duct
pumping unit
Prior art date
Application number
IT002310A
Other languages
Italian (it)
Inventor
Gennaro Daniele De
Maria Carmela Masellis
Salvatore Palmisano
Original Assignee
Bosch Gmbh Robert
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 Bosch Gmbh Robert filed Critical Bosch Gmbh Robert
Priority to ITMI2010A002310A priority Critical patent/IT1403264B1/en
Priority to RU2013132614/06A priority patent/RU2013132614A/en
Priority to JP2013543757A priority patent/JP2014503737A/en
Priority to EP11797236.4A priority patent/EP2652328B1/en
Priority to KR1020137015312A priority patent/KR20130141594A/en
Priority to PCT/EP2011/072757 priority patent/WO2012080334A1/en
Priority to CN201180059790.5A priority patent/CN103261683B/en
Publication of ITMI20102310A1 publication Critical patent/ITMI20102310A1/en
Application granted granted Critical
Publication of IT1403264B1 publication Critical patent/IT1403264B1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/225—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • 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
    • F02M37/0029—Pressure regulator in the low pressure fuel 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
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • 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
    • 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
    • F02M37/18—Feeding by means of driven pumps characterised by provision of main and auxiliary 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
    • F02M37/20—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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/447—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston means specially adapted to limit fuel delivery or to supply excess of fuel temporarily, e.g. for starting of the engine
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/08—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by two or more pumping elements with conjoint outlet or several pumping elements feeding one engine cylinder

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Description

DESCRIZIONE DESCRIPTION

“GRUPPO DI POMPAGGIO PER ALIMENTARE COMBUSTIBILE, PREFERIBILMENTE GASOLIO, DA UN SERBATOIO DI CONTENIMENTO AD UN MOTORE A COMBUSTIONE INTERNA†⠀ œPUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL OIL, FROM A CONTAINMENT TANK TO AN INTERNAL COMBUSTION ENGINEâ €

La presente invenzione à ̈ relativa ad un gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, da un serbatoio di contenimento ad un motore a combustione interna. The present invention relates to a pumping unit for feeding fuel, preferably diesel oil, from a containment tank to an internal combustion engine.

In particolare, la presente invenzione à ̈ relativa ad un gruppo di pompaggio del tipo comprendente una pompa di prealimentazione, per esempio una pompa ad ingranaggi; una pompa di alta pressione, per esempio una pompa a pistoni; ed un circuito idraulico comprendente, a sua volta, un primo ramo per collegare fra loro un serbatoio di contenimento del combustibile e la pompa ad ingranaggi, un secondo ramo per collegare fra loro la pompa ad ingranaggi e la pompa a pistoni, ed un terzo ramo per collegare fra loro la pompa a pistoni ed un motore a combustione interna. In particular, the present invention relates to a pumping unit of the type comprising a pre-feeding pump, for example a gear pump; a high pressure pump, for example a piston pump; and a hydraulic circuit comprising, in turn, a first branch for connecting together a fuel containment tank and the gear pump, a second branch for connecting the gear pump and the piston pump together, and a third branch to connect the piston pump and an internal combustion engine together.

Generalmente, il circuito idraulico comprende, inoltre, una elettrovalvola di dosaggio disposta lungo il secondo ramo per controllare selettivamente la portata istantanea di combustibile alimentata alla pompa a pistoni in funzione dei valori di una pluralità di parametri di funzionamento del motore a combustione interna; ed un quarto ramo, che collega fra loro il secondo ramo ed il serbatoio di contenimento, à ̈ collegato al secondo ramo a monte della elettrovalvola di dosaggio in una direzione di avanzamento del combustibile lungo il secondo ramo stesso, e consente di scaricare nel serbatoio di contenimento almeno parte della portata di combustibile eccedente quella alimentata attraverso l’elettrovalvola di dosaggio. Generally, the hydraulic circuit also comprises a metering solenoid valve arranged along the second branch to selectively control the instantaneous flow rate of fuel supplied to the piston pump as a function of the values of a plurality of operating parameters of the internal combustion engine; and a fourth branch, which connects the second branch and the containment tank together, is connected to the second branch upstream of the metering solenoid valve in a direction of advancement of the fuel along the second branch itself, and allows containment of at least part of the fuel flow in excess of that fed through the metering solenoid valve.

Il quarto ramo à ̈ provvisto, normalmente, di una valvola di troppo-pieno e di un condotto ad effetto Venturi, che definisce parte del quarto ramo, à ̈ disposto a valle della valvola di troppo-pieno in una direzione di avanzamento del combustibile lungo il quarto ramo, ed à ̈ collegato con un quinto ramo del circuito idraulico collegato, a sua volta, con il secondo ramo a valle della elettrovalvola di dosaggio nella direzione di avanzamento del combustibile lungo il secondo ramo stesso. The fourth branch is normally equipped with an overflow valve and a venturi effect duct, which defines part of the fourth branch, is arranged downstream of the overflow valve in a direction of advancement of the fuel along the fourth branch, and is connected with a fifth branch of the hydraulic circuit connected, in turn, with the second branch downstream of the metering solenoid valve in the direction of advancement of the fuel along the second branch itself.

Il quinto ramo consente di scaricare nel condotto ad effetto Venturi e, quindi, nel serbatoio di contenimento il combustibile che trafila attraverso l’elettrovalvola di dosaggio chiusa e parte del combustibile alimentato attraverso l’elettrovalvola di dosaggio aperta. The fifth branch allows the fuel flowing through the closed metering solenoid valve and part of the fuel fed through the open metering solenoid valve to be discharged into the Venturi effect duct and, therefore, into the containment tank.

Il condotto ad effetto Venturi presenta un asse longitudinale determinato, comprende un foro centrale assiale definente un primo ingresso per ricevere il combustibile proveniente dal quarto ramo ed una uscita del combustibile nel quarto ramo stesso, ed à ̈ provvisto di un foro laterale radiale, che à ̈ collegato con il foro centrale, e definisce un secondo ingresso per ricevere il combustibile proveniente dal quinto ramo. The Venturi effect duct has a determined longitudinal axis, comprises a central axial hole defining a first inlet for receiving the fuel coming from the fourth branch and a fuel outlet in the fourth branch itself, and is provided with a lateral radial hole, which is It is connected to the central hole, and defines a second inlet to receive the fuel coming from the fifth branch.

Per evitare che il combustibile trafili nel secondo ingresso passando tra il condotto ad effetto Venturi ed il quarto ramo, il condotto ad effetto Venturi presenta due porzioni di accoppiamento di diametro differente accoppiate a tenuta di fluido per interferenza con corrispondenti porzioni di accoppiamento ricavate nel quarto ramo stesso. To prevent the fuel from leaking into the second inlet passing between the Venturi effect duct and the fourth branch, the Venturi effect duct has two coupling portions of different diameters coupled in a fluid-tight manner by interference with corresponding coupling portions obtained in the fourth branch. same.

Da quanto sopra esposto discende che il montaggio del condotto ad effetto Venturi all’interno del quarto ramo à ̈ relativamente complesso e difficoltoso e richiede elevate tolleranze dimensionali capaci di garantire il corretto accoppiamento a tenuta di fluido tra le citate porzioni di accoppiamento. From the above it follows that the assembly of the Venturi effect duct inside the fourth branch is relatively complex and difficult and requires high dimensional tolerances capable of guaranteeing the correct fluid-tight coupling between the aforementioned coupling portions.

Scopo della presente invenzione à ̈ di realizzare un gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, da un serbatoio di contenimento ad un motore a combustione interna che sia esente dagli inconvenienti sopra descritti e che sia di semplice ed economica attuazione. The object of the present invention is to provide a pumping unit for feeding fuel, preferably diesel oil, from a containment tank to an internal combustion engine which is free from the drawbacks described above and which is simple and economical to implement.

Secondo la presente invenzione viene realizzato un gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, da un serbatoio di contenimento ad un motore a combustione interna come rivendicato nelle rivendicazioni allegate. According to the present invention, a pumping unit is provided for feeding fuel, preferably diesel oil, from a containment tank to an internal combustion engine as claimed in the attached claims.

La presente invenzione verrà ora descritta con riferimento ai disegni annessi, che ne illustrano un esempio di attuazione non limitativo, in cui: The present invention will now be described with reference to the attached drawings, which illustrate a non-limiting example of embodiment, in which:

la figura 1 Ã ̈ uno schema idraulico di una preferita forma di attuazione del gruppo di pompaggio della presente invenzione; e Figure 1 is a hydraulic diagram of a preferred embodiment of the pumping unit of the present invention; And

la figura 2 Ã ̈ una sezione longitudinale di un particolare del gruppo di pompaggio della figura 1. figure 2 is a longitudinal section of a detail of the pumping unit of figure 1.

Con riferimento alla figura 1, con 1 à ̈ indicato, nel suo complesso, un gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, da un serbatoio 2 di contenimento ad un motore 3 a combustione interna, nella fattispecie un motore a scoppio Diesel comprendente un collettore 4 di distribuzione del combustibile, comunemente indicato con il termine di “common rail†, ed una pluralità di iniettori 5 collegati con il collettore 4 ed atti a nebulizzare il combustibile all’interno di relative camere di combustione (non illustrate) del motore 3 stesso. With reference to Figure 1, 1 indicates, as a whole, a pumping unit for feeding fuel, preferably diesel oil, from a containment tank 2 to an internal combustion engine 3, in this case a Diesel internal combustion engine comprising a fuel distribution manifold 4, commonly referred to as â € œcommon railâ €, and a plurality of injectors 5 connected to the manifold 4 and adapted to nebulize the fuel inside the relative combustion chambers (not shown) of the motor 3 itself.

Il gruppo di pompaggio 1 comprende una pompa 6 di alta pressione, nella fattispecie una pompa a pistoni, atta ad alimentare il combustibile al motore 3, ed una pompa 7 di bassa pressione o pre-alimentazione, nella fattispecie una pompa ad ingranaggi, atta ad alimentare il combustibile dal serbatoio 2 alla pompa 6. The pumping unit 1 comprises a high pressure pump 6, in this case a piston pump, suitable for feeding fuel to the engine 3, and a low pressure or pre-feeding pump 7, in this case a gear pump, suitable for feed fuel from tank 2 to pump 6.

La pompa 6 comprende un corpo pompa 8 presentante un asse 9 longitudinale determinato, ed una pluralità di cilindri 10 (nella fattispecie due cilindri 10), i quali sono ricavati nel corpo pompa 8, sono uniformemente distribuiti attorno all’asse 9, presentano rispettivi assi 11 longitudinali sostanzialmente perpendicolari all’asse 9 stesso, e sono impegnati in maniera scorrevole, ciascuno, da un rispettivo pistone 12. The pump 6 comprises a pump body 8 having a determined longitudinal axis 9, and a plurality of cylinders 10 (in this case two cylinders 10), which are obtained in the pump body 8, are uniformly distributed around the axis 9, have respective longitudinal axes 11 substantially perpendicular to the axis 9 itself, and are each engaged in a sliding manner by a respective piston 12.

I pistoni 12 vengono spostati lungo i relativi cilindri 10 da un dispositivo 13 di azionamento di tipo noto alloggiato all’interno del corpo pompa 8 con un moto rettilineo alternativo comprendente una corsa di andata di aspirazione del combustibile nei relativi cilindri 10 ed una corsa di ritorno di compressione del combustibile contenuto nei relativi cilindri 10 stessi. The pistons 12 are moved along the relative cylinders 10 by an actuation device 13 of a known type housed inside the pump body 8 with a reciprocating rectilinear motion comprising a forward stroke for the intake of the fuel in the relative cylinders 10 and a stroke of compression return of the fuel contained in the relative cylinders 10 themselves.

Il gruppo di pompaggio 1 comprende, inoltre, un circuito 14 idraulico di alimentazione del combustibile comprendente, a sua volta, un primo ramo 15 per collegare fra loro il serbatoio 2 e la pompa 7, un secondo ramo 16, il quale collega fra loro le pompe 6 e 7, si estende attraverso il corpo pompa 8 per lubrificare il dispositivo 13 di azionamento, ed à ̈ collegato a ciascun cilindro 10 attraverso una relativa valvola 17 di aspirazione, ed un terzo ramo 18, che si estende tra la pompa 6 ed il collettore 4, ed à ̈ collegato a ciascun cilindro 10 attraverso una relativa valvola 19 di mandata. The pumping unit 1 also comprises a hydraulic fuel supply circuit 14 comprising, in turn, a first branch 15 to connect the tank 2 and the pump 7 together, a second branch 16, which connects the pumps 6 and 7, extends through the pump body 8 to lubricate the actuation device 13, and is connected to each cylinder 10 through a relative intake valve 17, and a third branch 18, which extends between the pump 6 and the manifold 4, and is connected to each cylinder 10 through a relative delivery valve 19.

Il ramo 16 à ̈ provvisto di una elettrovalvola 20 di dosaggio, la quale à ̈ montata a monte delle valvole 17 in una direzione 21 di avanzamento del combustibile lungo i tratti 15, 16, e 18, à ̈ mobile tra una posizione di chiusura ed una posizione di apertura, ed à ̈ atta a controllare selettivamente la portata istantanea di combustibile alimentata alla pompa 6 in funzione dei valori di una pluralità di parametri di funzionamento del motore 3. The branch 16 is provided with a metering solenoid valve 20, which is mounted upstream of the valves 17 in a direction 21 for the advancement of the fuel along the sections 15, 16, and 18, it is movable between a closed position and an open position, and is adapted to selectively control the instantaneous flow rate of fuel supplied to the pump 6 as a function of the values of a plurality of operating parameters of the engine 3.

Il circuito 14 comprende, inoltre, un quarto ramo 22, il quale si estende tra il collettore 4 ed il serbatoio 2, ed à ̈ provvisto di una elettrovalvola 23 di dosaggio, che coopera con l’elettrovalvola 20 per controllare selettivamente la portata di combustibile alimentata agli iniettori 5, e consente di scaricare nel serbatoio 2 la portata di combustibile eccedente quella necessaria agli iniettori 5. The circuit 14 also comprises a fourth branch 22, which extends between the manifold 4 and the tank 2, and is provided with a dosing solenoid valve 23, which cooperates with the solenoid valve 20 to selectively control the flow rate fuel fed to the injectors 5, and allows the fuel flow in excess of that required by the injectors 5 to be discharged into the tank 2.

Il circuito 14 presenta, inoltre, un quinto ramo 24, il quale collega il ramo 16 a monte dell’elettrovalvola 20 nella direzione 21 con il ramo 22, e consente di scaricare nel ramo 22 e, quindi, nel serbatoio 2 almeno parte della portata di combustibile eccedente quella alimentata attraverso l’elettrovalvola 20 stessa. The circuit 14 also has a fifth branch 24, which connects the branch 16 upstream of the solenoid valve 20 in the direction 21 with the branch 22, and allows to discharge in the branch 22 and, therefore, in the tank 2 at least part of the fuel flow exceeding that supplied through the solenoid valve 20 itself.

Il ramo 24 presenta un asse 25 longitudinale determinato, comprende un tratto 26 allargato ed un tratto 27 ristretto collegati fra loro in corrispondenza di uno spallamento 28 di fine-corsa ortogonale all’asse 25, ed à ̈ provvisto di una valvola 29 di troppo-pieno. The branch 24 has a determined longitudinal axis 25, comprises an enlarged section 26 and a narrow section 27 connected to each other in correspondence with a shoulder 28 of limit switch orthogonal to axis 25, and is provided with an excess valve 29 -full.

La valvola 29 presenta un ingresso 29a per ricevere il combustibile proveniente dal ramo 24, una prima uscita 29b del combustibile nel ramo 24, ed una seconda uscita 29c del combustibile in un ramo 30 del circuito 14 estendentesi tra la valvola 29 ed il ramo 15. The valve 29 has an inlet 29a for receiving the fuel coming from the branch 24, a first fuel outlet 29b in the branch 24, and a second fuel outlet 29c in a branch 30 of the circuit 14 extending between the valve 29 and the branch 15.

La valvola 29 à ̈, inoltre, configurata per aprire unicamente l’uscita 29b quando la portata di combustibile alimentata lungo il ramo 24 à ̈ minore di un valore di soglia determinato e per aprire le due uscite 29b e 29c quando la portata di combustibile alimentata lungo il ramo 24 à ̈ almeno pari al valore di soglia stesso. The valve 29 is also configured to open only the outlet 29b when the flow of fuel supplied along the branch 24 is less than a determined threshold value and to open the two outlets 29b and 29c when the flow of fuel fed along branch 24 is at least equal to the threshold value itself.

Secondo quanto illustrato nelle figure 1 e 2, il circuito 14 comprende, inoltre, un condotto 31 ad effetto Venturi, il quale à ̈ montato nel tratto 26 a valle della valvola 29 in una direzione 32 di avanzamento del combustibile lungo il ramo 24, ed à ̈ provvisto di un foro 33 centrale, che si estende attraverso il condotto 31 coassialmente all’asse 25, e comprende una porzione 33a di ingresso troncoconica convergente nella direzione 32, una porzione 33b di uscita troncoconica divergente nella direzione 32, ed una porzione 33c intermedia cilindrica estendentesi tra le porzioni 33a e 33b. According to what is illustrated in Figures 1 and 2, the circuit 14 also comprises a duct 31 with a Venturi effect, which is mounted in the section 26 downstream of the valve 29 in a direction 32 for the advancement of the fuel along the branch 24, and It is provided with a central hole 33, which extends through the duct 31 coaxially to the axis 25, and comprises a frusto-conical inlet portion 33a converging in direction 32, a truncated-conical outlet portion 33b diverging in direction 32, and a portion 33a 33c cylindrical intermediate extending between portions 33a and 33b.

Il condotto 31 presenta, inoltre, un foro 34 calibrato radiale, il quale à ̈ ricavato in un punto intermedio del condotto 31 trasversalmente all’asse 25, comunica con la porzione 33c del foro 33, e comunica, inoltre, con un ulteriore ramo 35 del circuito 14 a sua volta collegato con il ramo 16 a valle dell’elettrovalvola 20 nella direzione 21. The duct 31 also has a radial calibrated hole 34, which is obtained in an intermediate point of the duct 31 transversely to the axis 25, communicates with the portion 33c of the hole 33, and also communicates with a further branch 35 of the circuit 14 in turn connected with the branch 16 downstream of the solenoid valve 20 in direction 21.

Dal momento che la pressione del combustibile nella porzione 33c à ̈ relativamente ridotta e minore della pressione del combustibile nel ramo 35, il condotto 31 consente di assorbire la portata di combustibile che trafila attraverso l’elettrovalvola 20 quando l’elettrovalvola 20 stessa à ̈ chiusa. Dal momento che il ramo 35 à ̈ sempre collegato con il ramo 16 e con il foro 34, à ̈ opportuno precisare che il condotto 31 assorbe anche una parte della portata di combustibile alimentata attraverso l’elettrovalvola 20 quando l’elettrovalvola 20 à ̈ aperta e che il foro 34 à ̈ configurato per limitare al disotto di un valore di soglia determinato la quantità di combustibile assorbita dal condotto 31 quando l’elettrovalvola 20 à ̈ aperta. Since the pressure of the fuel in the portion 33c is relatively low and lower than the pressure of the fuel in the branch 35, the duct 31 allows to absorb the flow of fuel that leaks through the solenoid valve 20 when the solenoid valve 20 itself is closed. Since the branch 35 is always connected with the branch 16 and with the hole 34, it is appropriate to specify that the duct 31 also absorbs a part of the fuel flow fed through the solenoid valve 20 when the solenoid valve 20 is It is open and that the hole 34 is configured to limit the quantity of fuel absorbed by the duct 31 when the solenoid valve 20 is open below a certain threshold value.

Il tratto 26 ed il condotto 31 presentano rispettive porzioni 36 di accoppiamento, le quali sono ricavate sulla superficie interna del tratto 26 e, rispettivamente, sulla superficie esterna del condotto 31, e sono accoppiate a tenuta di fluido fra loro tramite rispettive filettature Gas 37. The section 26 and the duct 31 have respective coupling portions 36, which are formed on the internal surface of the section 26 and, respectively, on the external surface of the duct 31, and are fluid-tight coupled to each other by means of respective Gas threads 37.

Il condotto 31 viene avvitato nel tratto 26 in modo da disporsi a contatto dello spallamento 28 ed accoppiarsi a tenuta di fluido con lo spallamento 28 stesso, e presenta una testa 38 cava poligonale, la quale à ̈ ricavata nel foro 33 a monte della porzione 33a nella direzione 32, e consente ad una chiave a brugola nota e non illustrata di avvitare il condotto 31 nel ramo 24 e di svitare il condotto 31 dal ramo 24 stesso. The duct 31 is screwed into the portion 26 so as to be in contact with the shoulder 28 and coupled in a fluid-tight manner with the shoulder 28 itself, and has a polygonal hollow head 38, which is obtained in the hole 33 upstream of the portion 33a in the direction 32, and allows a known and not illustrated Allen wrench to screw the duct 31 into the branch 24 and to unscrew the duct 31 from the branch 24 itself.

A proposito di quanto sopra esposto à ̈ opportuno precisare che: Regarding the above, it should be noted that:

gli accoppiamenti a tenuta di fluido tra le filettature Gas 37 e tra lo spallamento 28 ed il condotto 31 impediscono al combustibile di trafilare tra i tratti 26 e 27 del ramo 24 ed il condotto 31 consentendo al condotto 31 di assorbire il combustibile attraverso il foro 34; e the fluid-tight couplings between the Gas threads 37 and between the shoulder 28 and the duct 31 prevent the fuel from leaking between the sections 26 and 27 of the branch 24 and the duct 31 allowing the duct 31 to absorb the fuel through the hole 34 ; And

le filettature Gas 37 consentono di montare in maniera relativamente semplice ed economica il condotto 31 nel ramo 24. the Gas threads 37 allow the duct 31 to be mounted in the branch 24 in a relatively simple and economical manner.

Claims (1)

RIVENDICAZIONI 1.- Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, da un serbatoio di contenimento (2) ad un motore a combustione interna (3), il gruppo di pompaggio comprendendo una pompa di pre-alimentazione (7); una pompa di alta pressione (6); un circuito idraulico (14) comprendente, a sua volta, un primo ramo (15) per collegare fra loro il serbatoio di contenimento (2) e la pompa di pre-alimentazione (7), un secondo ramo (16) per collegare fra loro la pompa di pre-alimentazione (7) e la pompa di alta pressione (6), un terzo ramo (18) per collegare fra loro la pompa di alta pressione (6) ed il motore a combustione interna (3), un quarto ramo (24) per collegare fra loro il secondo ramo (16) ed il serbatoio di contenimento (2), ed un quinto ramo (35) per collegare fra loro il secondo ed il quarto ramo (16, 24); ed un condotto ad effetto Venturi (31), il quale definisce parte del quarto ramo (24), e comunica idraulicamente con il quinto ramo (35); ed essendo caratterizzato dal fatto che il condotto ad effetto Venturi (31) à ̈ avvitato nel quarto ramo (24). 2.- Gruppo di pompaggio secondo la rivendicazione 1, in cui il quarto ramo (24) ed il condotto ad effetto Venturi (31) comprendono rispettive porzioni di accoppiamento (36), le quali sono ricavate sulla superficie interna del quarto ramo (24) e, rispettivamente, sulla superficie esterna del condotto ad effetto Venturi (31), e sono accoppiate a tenuta di fluido una all’altra tramite rispettive filettature Gas (37). 3.- Gruppo di pompaggio secondo la rivendicazione 2, in cui il condotto ad effetto Venturi (31) comprende un primo ingresso (33a) per ricevere il combustibile proveniente dal quarto ramo (24), un secondo ingresso (34) per ricevere il combustibile proveniente dal quinto ramo (35), ed una uscita (33b) del combustibile nel quarto ramo (24) stesso. 4.- Gruppo di pompaggio secondo la rivendicazione 3, in cui il secondo ingresso (34) à ̈ ricavato a valle della porzione di accoppiamento (36) del condotto ad effetto Venturi (31) in una direzione di avanzamento (32) del combustibile lungo il quarto ramo (24). 5.- Gruppo di pompaggio secondo la rivendicazione 3 o 4, in cui il condotto ad effetto Venturi (31) à ̈ provvisto di un foro centrale (33), il quale si estende attraverso il condotto ad effetto Venturi (31) coassialmente ad un asse longitudinale (25) del quarto ramo (24) per definire il primo ingresso (33a) e l’uscita (33b); il secondo ingresso (34) estendendosi radialmente attraverso il condotto ad effetto Venturi (31) per comunicare idraulicamente con il foro centrale (33). 6.- Gruppo di pompaggio secondo una qualsiasi delle precedenti rivendicazioni, in cui il quarto ramo (24) comprende una porzione allargata (26) ed una porzione ristretta (27), le quali sono disposte in successione fra loro, e sono collegate una all’altra in corrispondenza di uno spallamento di fine corsa (28) sostanzialmente ortogonale ad un asse longitudinale (25) del quarto ramo (24) stesso; il condotto ad effetto Venturi (31) essendo avvitato nella detta porzione allargata (26) in modo da disporsi a contatto del, ed accoppiarsi a tenuta di fluido con il, detto spallamento di fine corsa (28). 7.- Gruppo di pompaggio secondo una qualsiasi delle precedenti rivendicazioni, in cui il condotto ad effetto Venturi (31) presenta una testa poligonale (38) atta ad essere impegnata da una chiave di manovra. 8.- Gruppo di pompaggio secondo una qualsiasi delle precedenti rivendicazioni e comprendente, inoltre, una valvola di troppo-pieno (29) disposta lungo il quarto ramo (24) a monte del condotto ad effetto Venturi (31) in una direzione di avanzamento (32) del combustibile lungo il quarto ramo (24) stesso. 9.- Gruppo di pompaggio secondo una qualsiasi delle precedenti rivendicazioni, in cui il circuito idraulico (14) comprende, inoltre, una elettrovalvola di dosaggio (20) montata lungo il secondo ramo (16); il quarto ramo (24) ed il quinto ramo (35) essendo collegati al secondo ramo (16) a monte e, rispettivamente, a valle della elettrovalvola di dosaggio (20) in una direzione di avanzamento (21) del combustibile lungo il secondo ramo (16) stesso.CLAIMS 1.- Pumping group for feeding fuel, preferably diesel oil, from a containment tank (2) to an internal combustion engine (3), the pumping group comprising a pre-feeding pump (7); a high pressure pump (6); a hydraulic circuit (14) comprising, in turn, a first branch (15) to connect together the containment tank (2) and the pre-feed pump (7), a second branch (16) to connect together the pre-fuel pump (7) and the high pressure pump (6), a third branch (18) to connect the high pressure pump (6) and the internal combustion engine (3) together, a fourth branch (24) to connect the second branch (16) and the containment tank (2) together, and a fifth branch (35) to connect the second and fourth branches (16, 24) together; and a Venturi effect duct (31), which defines part of the fourth branch (24), and communicates hydraulically with the fifth branch (35); and being characterized by the fact that the Venturi effect duct (31) is screwed into the fourth branch (24). 2.- Pumping unit according to Claim 1, in which the fourth branch (24) and the Venturi effect duct (31) comprise respective coupling portions (36), which are obtained on the internal surface of the fourth branch (24) and, respectively, on the external surface of the Venturi effect duct (31), and are coupled in a fluid-tight manner to each other by means of respective Gas threads (37). 3.- Pumping unit according to claim 2, wherein the Venturi effect duct (31) comprises a first inlet (33a) for receiving the fuel coming from the fourth branch (24), a second inlet (34) for receiving the fuel coming from the fifth branch (35), and a fuel outlet (33b) in the fourth branch (24) itself. 4.- Pumping unit according to Claim 3, in which the second inlet (34) is obtained downstream of the coupling portion (36) of the Venturi effect duct (31) in a direction of advancement (32) of the fuel along the fourth branch (24). 5.- Pumping unit according to Claim 3 or 4, in which the Venturi effect duct (31) is provided with a central hole (33), which extends through the Venturi effect duct (31) coaxially to a longitudinal axis (25) of the fourth branch (24) to define the first inlet (33a) and the outlet (33b); the second inlet (34) extending radially through the Venturi effect duct (31) to hydraulically communicate with the central hole (33). 6.- Pumping unit according to any one of the preceding claims, in which the fourth branch (24) comprises an enlarged portion (26) and a narrow portion (27), which are arranged in succession to each other, and are connected one to the other. Another in correspondence with an end stop shoulder (28) substantially orthogonal to a longitudinal axis (25) of the fourth branch (24) itself; the Venturi effect duct (31) being screwed into the said enlarged portion (26) so as to arrange itself in contact with, and fluid-tight fit with the said end-of-stroke shoulder (28). 7.- Pumping unit according to any one of the preceding claims, in which the Venturi effect duct (31) has a polygonal head (38) able to be engaged by an operating key. 8.- Pumping unit according to any one of the preceding claims and further comprising an overflow valve (29) arranged along the fourth branch (24) upstream of the Venturi effect duct (31) in a forward direction ( 32) of the fuel along the fourth branch (24) itself. 9.- Pumping unit according to any one of the preceding claims, wherein the hydraulic circuit (14) further comprises a metering solenoid valve (20) mounted along the second branch (16); the fourth branch (24) and the fifth branch (35) being connected to the second branch (16) upstream and, respectively, downstream of the metering solenoid valve (20) in a direction of feed (21) of the fuel along the second branch (16) himself.
ITMI2010A002310A 2010-12-16 2010-12-16 PUMPING GROUP FOR FOOD FUEL, PREFERIBLY GASOIL, FROM A CONTAINMENT TANK TO AN INTERNAL COMBUSTION ENGINE IT1403264B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
ITMI2010A002310A IT1403264B1 (en) 2010-12-16 2010-12-16 PUMPING GROUP FOR FOOD FUEL, PREFERIBLY GASOIL, FROM A CONTAINMENT TANK TO AN INTERNAL COMBUSTION ENGINE
RU2013132614/06A RU2013132614A (en) 2010-12-16 2011-12-14 PUMP UNIT FOR SUPPLYING FUEL, PREFERREDLY DIESEL FUEL, FROM THE FUEL TANK TO THE INTERNAL COMBUSTION ENGINE
JP2013543757A JP2014503737A (en) 2010-12-16 2011-12-14 Pump unit for supplying fuel, preferably diesel fuel, from the storage tank to the internal combustion engine
EP11797236.4A EP2652328B1 (en) 2010-12-16 2011-12-14 Pump unit for feeding fuel, preferably diesel fuel, from a storage tank to an internal combustion engine
KR1020137015312A KR20130141594A (en) 2010-12-16 2011-12-14 Pump unit for feeding fuel, preferably diesel fuel, from a storage tank to an internal combustion engine
PCT/EP2011/072757 WO2012080334A1 (en) 2010-12-16 2011-12-14 Pump unit for feeding fuel, preferably diesel fuel, from a storage tank to an internal combustion engine
CN201180059790.5A CN103261683B (en) 2010-12-16 2011-12-14 For the fuel of preferably diesel fuel to be fed to the pump unit of explosive motor from storage tank

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ITMI2010A002310A IT1403264B1 (en) 2010-12-16 2010-12-16 PUMPING GROUP FOR FOOD FUEL, PREFERIBLY GASOIL, FROM A CONTAINMENT TANK TO AN INTERNAL COMBUSTION ENGINE

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WO (1) WO2012080334A1 (en)

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JP6533290B2 (en) * 2014-12-24 2019-06-19 ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツングＲｏｂｅｒｔ Ｂｏｓｃｈ Ｇｍｂｈ Pump unit for supplying fuel, preferably diesel fuel, to an internal combustion engine
ITUA20162000A1 (en) * 2016-03-24 2017-09-24 Bosch Gmbh Robert PUMPING GROUP FOR FUEL SUPPLEMENTATION, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE
IT201700042497A1 (en) * 2017-04-18 2018-10-18 Bosch Gmbh Robert HIGH PRESSURE PUMP FOR A FUEL SUPPLY SYSTEM TO AN INTERNAL COMBUSTION ENGINE; FUEL SUPPLY SYSTEM AND METHOD TO REALIZE THE HIGH PRESSURE PUMP
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RU2013132614A (en) 2015-01-27
JP2014503737A (en) 2014-02-13
WO2012080334A1 (en) 2012-06-21
CN103261683A (en) 2013-08-21
EP2652328B1 (en) 2014-09-17
IT1403264B1 (en) 2013-10-17
CN103261683B (en) 2016-08-10
EP2652328A1 (en) 2013-10-23
KR20130141594A (en) 2013-12-26

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