CN103261683B - For the fuel of preferably diesel fuel to be fed to the pump unit of explosive motor from storage tank - Google Patents

For the fuel of preferably diesel fuel to be fed to the pump unit of explosive motor from storage tank Download PDF

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Publication number
CN103261683B
CN103261683B CN201180059790.5A CN201180059790A CN103261683B CN 103261683 B CN103261683 B CN 103261683B CN 201180059790 A CN201180059790 A CN 201180059790A CN 103261683 B CN103261683 B CN 103261683B
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CN
China
Prior art keywords
pipeline
fuel
venturi tube
pump unit
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.)
Expired - Fee Related
Application number
CN201180059790.5A
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Chinese (zh)
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CN103261683A (en
Inventor
S·帕尔米萨诺
D·德真纳罗
N·梅多罗
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of CN103261683A publication Critical patent/CN103261683A/en
Application granted granted Critical
Publication of CN103261683B publication Critical patent/CN103261683B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • 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

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  • 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)

Abstract

A kind of pump unit for the fuel of preferably diesel fuel being fed to explosive motor (3), described pump unit is provided with: hydraulic circuit (14), it has the first pipeline (15) for fuel reservoir (2) and pre-fed pump (7) being linked together, for the second pipeline (16) that pre-fed pump (7) and high-pressure pump (6) are linked together, for the 3rd pipeline (18) that high-pressure pump (6) and explosive motor (3) are linked together, for the 4th pipeline (24) that the second pipeline (16) and storage tank (2) are linked together, and for by second and the 4th pipeline (16, 24) the 5th pipeline (35) linked together；Venturi tube (31), its be threaded onto in the 4th pipeline (24) and with the 5th pipeline (35) hydraulic communication.

Description

For the fuel of preferably diesel fuel to be fed to the pump unit of explosive motor from storage tank
Technical field
The present invention relates to a kind of for the fuel of preferably diesel fuel is fed to internal-combustion engine from storage tank The pump unit of machine.
Background technology
Especially, the pump unit of type involved in the present invention includes: the pump housing, such as gear pump；High pressure Pump, such as piston pump；And hydraulic circuit, it includes again for fuel reservoir and gear pump being connected The first pipeline together, for the second pipeline that gear pump and piston pump are linked together, and For the 3rd pipeline that piston pump and explosive motor are linked together.
Generally, hydraulic circuit also includes: the metering solenoid valve arranged along the second pipeline, described metering electricity Magnet valve is for optionally controlling to be fed to piston pump according to multiple operational parameter value of explosive motor The instantaneous flow rate of fuel；And the 4th pipeline that the second pipeline and storage tank linked together, described Four pipelines are connected in the upstream of metering solenoid valve along the flow direction of described second pipeline at fuel Second pipeline, and allow more than at least of fuel stream of fuel through metering solenoid valve supply Divide and be emitted in storage tank.
Generally, the 4th pipeline is provided with overflow valve and Venturi tube, and described Venturi tube limits a part the Four pipelines, along the flow direction of the 4th pipeline, it is arranged on the downstream of overflow valve at fuel and is connected Receive the 5th pipeline of hydraulic circuit, described 5th pipeline again at fuel along the flowing of described second pipeline On direction, the downstream in metering solenoid valve is connected to the second pipeline.
5th pipeline allows to ooze the fuel of the metering solenoid valve closed and by the metering solenoid valve opened A part of fuel draining of supply is in Venturi tube and be thus discharged in storage tank.
Venturi tube has: given longitudinal axis；Including axially centered hole, it limits for from the 4th Pipeline receives the first entrance of fuel and the outlet of the fuel in described 4th pipeline；And be provided with Radially side opening, it is connected to medium pore and limits the second entrance for receiving fuel from the 5th pipeline.
In order to prevent the fuel penetrating in the second entrance process between Venturi tube and the 4th pipeline, literary composition Venturi has the two basic change portion of different-diameter, said two joint portion by means of be formed at described Corresponding joint portion interference fit in 4th pipeline and combine in fluid-tight mode.
From described above can it is clear that in Venturi tube is arranged on the 4th pipeline be relative complex and Difficulty, and require high dimensional tolerance and guarantee the correct fluid tight between each described joint portion Connection.
Summary of the invention
It is an object of the invention to provide a kind of for by the fuel of preferably diesel fuel from storage tank supply To the pump unit of explosive motor, it does not have disadvantages mentioned above and is simple to manufacture cheap.
According to the present invention for the fuel of preferably diesel fuel is fed to explosive motor from storage tank Pump unit be arranged to as described in the appended claims.
Accompanying drawing explanation
Referring now to accompanying drawing, present invention is described, and described accompanying drawing shows embodiments of the invention Non-limiting example, wherein:
Fig. 1 is the hydraulic diagram of a preferred embodiment of the pump unit according to the present invention；And
Fig. 2 is the longitudinal sectional view of the details of the pump unit according to Fig. 1.
Detailed description of the invention
With reference to Fig. 1, fuel, particularly diesel fuel are fed to explosive motor from storage tank 2 by 1 expression The entirety of the pump unit of 3, in the example discussed, Diesel engine includes typically with term " common rail " The fuel distribution manifold 4 described and the multiple ejectors 5 being connected to described manifold 4, described spray Emitter 5 is also designed to inject fuel into the relative combustion indoor (not shown) of described electromotor 3.
Pump unit 1 includes: high-pressure pump 6, and it is piston pump in this example, and is designed to supply fuel Electromotor 3 should be given；And low-lift pump or pre-fed pump 7, it is gear pump in this example, and design Become from storage tank 2, fuel is fed to pump 6.
The pump housing 8 that pump 6 includes having given longitudinal axis 9 and multiple cylinder body 10 are (in this example It is two cylinder bodies 10), the plurality of cylinder body is formed in the pump housing 8, is uniformly distributed around axis 9 and has There is the corresponding longitudinal axis being substantially perpendicular to described axis 9, and the plurality of cylinder body is respectively by phase The piston 12 answered slidably engages.
Piston 12 is transported with reciprocating linear by the actuation means 13 being contained in the known type in the pump housing 8 Dynamic mode shifts along associated cylinder block 10, and described linear reciprocating motion includes: for being drawn by fuel Enter the outstroke of associated cylinder block 10, and for the fuel being contained in described associated cylinder block 10 The backward stroke being compressed.
Pump unit 1 also includes the hydraulic circuit 14 for supplying fuel, and described hydraulic circuit 14 includes again: First pipeline 15, it is for linking together storage tank 2 and pump 7；Second pipeline 16, it is by pump 6 With 7 link together, run through the pump housing 8 with lubrication actuation means 13 and via relevant inlet valve 17 It is connected to each cylinder body 10；And the 3rd pipeline 18, its extend between pump 6 and manifold 4 and It is connected to each cylinder body 10 by means of relevant transmission valve 19.
Second pipeline 16 is provided with metering solenoid valve 20, described metering solenoid valve fuel along pipeline 15, Be arranged on the directions 21 of 16 and 18 flowings valve 17 upstream, can closed position and open position it Between move and be designed to the multiple operational parameter value according to electromotor 3 and optionally control to be fed to pump 6 The instantaneous flow rate of fuel.
Loop 14 also includes pipeline 22, and pipeline 22 extends between manifold 4 and storage tank 2 and is provided with Metering solenoid valve 23, described metering solenoid valve 23 cooperates with metering solenoid valve 20 cooperation, in order to select Property ground control be fed to the flow rate of fuel of ejector 5 and allow more than the combustion needed for ejector 5 Stream is emitted in storage tank 2.
Loop 14 also has the 4th pipeline 24, and described 4th pipeline will be in metering electromagnetism along direction 21 Second pipeline 16 of valve 20 upstream is connected to pipeline 22 and allows more than through described metering electromagnetism Being emitted into pipeline 22 at least partially and be thus emitted into storage tank 2 of fuel stream of the fuel of valve 20 supply In.
4th pipeline 24 has given longitudinal axis 25, is included in the row rectangular relative to axis 25 Link together at the shoulder 28 of journey end widens section 26 and narrowed section 27 and is provided with excessive Stream valve 29.
Valve 29 has: entrance 29a, and it is for receiving the fuel from the 4th pipeline 24；First outlet 29b, its fuel in the 4th pipeline 24；And the second outlet 29c, it is in the loop 14 Between valve 29 and the first pipeline 15 extend pipeline 30 in fuel.
Valve 29 is additionally configured to: only when the flow rate of the fuel along the 4th pipeline 24 supply is less than given threshold Outlet 29b is just opened and when the flow rate of the fuel along the 4th pipeline 24 supply is at least equal to threshold during value Two outlet 29b and 29c are opened during value itself.
According to Fig. 1 and 2, loop 14 also includes that Venturi tube 31, described Venturi tube 31 exist Fuel is arranged in the section 26 in valve 29 downstream along the direction 32 that the 4th pipeline 24 flows, and is provided with With the medium pore 33 that axis 25 extends coaxially through pipeline 31, and include along direction 32 shrink butt Pyramid type intake section 33a, frustoconical exit portion 33b opened along direction 32, Yi Ji The cylindrical midsection extended between part 33a and 33b divides 33c.
Pipeline 31 also has radial alignment hole 34, and described radial alignment hole is relative to axis 25 laterally Part 33c of the midpoint and hole 33 that are formed at pipeline 31 be connected and with in loop 14 5th pipeline 35 is connected, and the 5th pipeline 35 is connected to be in metering solenoid valve 20 along direction 21 Second pipeline 16 in downstream.
Because the pressure of the fuel in part 33c is relatively low and is less than the fuel in the 5th pipeline 35 Pressure, so when described metering solenoid valve 20 is closed, pipeline 31 can suck and ooze metering electricity The fuel stream of magnet valve 20.It should be noted that because the 5th pipeline 35 is connected to the second pipeline always 16 and hole 34, so when metering solenoid valve 20 is opened, pipeline 31 also can suck and flow through metering electromagnetism A part of fuel stream of valve 20, and hole 34 is configured to when metering solenoid valve 20 is opened make by pipeline 31 fuel quantities sucked are less than given threshold value.
Section 26 and pipeline 31 have the joint portion 39 of correspondence, and each joint portion is respectively formed at section 26 Inner surface on and the outer surface of pipeline 31 on, and by means of corresponding pipe screw thread 37 with impermeable stream The mode of body combines.
Pipeline 31 is threaded onto in section 26, in order to be set to contact with shoulder 28 and with fluid tight Mode be attached to shoulder 28 self, described pipeline 31 also has polygonal hollow head 38, institute State hollow head to be formed in hole 33 along the upstream in direction 32 in part 33a, and in allowing Alan Pipeline 31 is threaded onto in described 4th pipeline 24 and from institute by die nut (known but not shown) State the 4th pipeline 24 to turn on.
In conjunction with described above it should be noted that between each pipe screw thread 37 and shoulder 28 and pipeline Fluid-tight connected mode between 31 prevents fuel from the 4th pipeline 24 and the section 26 of pipeline 31 And ooze out between 27, thus pipeline 31 is allowed to suck fuel by hole 34；And pipe screw thread 37 is permitted Permitted pipeline 31 to be arranged in the 4th pipeline 24 in the way of low cost by relatively easy.

Claims (7)

1. for fuel to be fed to a pump unit for explosive motor (3), institute from storage tank (2) State pump unit to include: pre-fed pump (7)；High-pressure pump (6)；Hydraulic circuit (14), it include for The first pipeline (15) that storage tank (2) and pre-fed pump (7) are linked together, for by pre-fed The second pipeline (16) that pump (7) and high-pressure pump (6) link together, for by high-pressure pump (6) The 3rd pipeline (18) that links together with explosive motor (3), for by the second pipeline (16) The 4th pipeline (24) that links together with storage tank (2) and for by the second pipeline (16) and The 5th pipeline (35) that 4th pipeline (24) links together；And Venturi tube (31), its limit The part of fixed 4th pipeline (24) and with the 5th pipeline (35) hydraulic communication；It is characterized in that,
Venturi tube (31) is screwed in the 4th pipeline (24)；
4th pipeline (24) and Venturi tube (31) include the joint portion (36) of correspondence, each joint portion Be respectively formed on the inner surface of the 4th pipeline (24) and Venturi tube (31) outer surface on and And combine in fluid-tight mode by means of corresponding pipe screw thread (37)；
Venturi tube (31) include for from the 4th pipeline (24) receive fuel the first entrance (33a), For receiving second entrance (34) of fuel from the 5th pipeline (35) and for described 4th pipeline (24) outlet (33b) of the fuel in；
Second entrance (34) is formed at along the flow direction (32) of the 4th pipeline (24) at fuel The downstream of the joint portion (36) of Venturi tube (31).
Pump unit the most according to claim 1, it is characterised in that Venturi tube (31) is provided with Medium pore (33), the longitudinal axis (25) of described medium pore and the 4th pipeline (24) extends coaxially through literary composition Venturi (31), in order to limit the first entrance (33a) and outlet (33b)；Second entrance (34) Extend radially through Venturi tube (31), in order to medium pore (33) hydraulic communication.
3. according to the arbitrary described pump unit of aforementioned claim, it is characterised in that the 4th pipeline (24) Including widened section (26) and narrowed portion (27), described widened section and narrowed portion follow one another Ground is arranged and at the stroke the most rectangular relative to the longitudinal axis (25) of described 4th pipeline (24) Shoulder (28) place of end links together；Venturi tube (31) is screwed to described widened section (26) in, in order to be arranged to the shoulder (28) with described end of travel and contact and with fluid tight Mode be bound to the shoulder of described end of travel.
Pump unit the most according to claim 1 and 2, it is characterised in that Venturi tube (31) There is the polygonal head (38) being applicable to be engaged by operation spanner.
Pump unit the most according to claim 1 and 2, it is characterised in that described pump unit is also wrapped Include overflow valve (29), described overflow valve at fuel along the flow direction (32) of described 4th pipeline (24) On arrange along the 4th pipeline (24) in the upstream of Venturi tube (31).
Pump unit the most according to claim 1 and 2, it is characterised in that hydraulic circuit (14) Also include the metering solenoid valve (20) installed along the second pipeline (16)；4th pipeline (24) and the 5th Pipeline (35) fuel along the flow direction (21) of described second pipeline (16) respectively at metering The upstream and downstream of electromagnetic valve (20) is connected to the second pipeline (16).
Pump unit the most according to claim 1 and 2, it is characterised in that described fuel is diesel oil.
CN201180059790.5A 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 Expired - Fee Related CN103261683B (en)

Applications Claiming Priority (3)

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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
ITMI2010A002310 2010-12-16
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

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CN103261683B true CN103261683B (en) 2016-08-10

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ITMI20102310A1 (en) 2012-06-17
WO2012080334A1 (en) 2012-06-21
CN103261683A (en) 2013-08-21
RU2013132614A (en) 2015-01-27
IT1403264B1 (en) 2013-10-17
JP2014503737A (en) 2014-02-13

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