EP2148982A2 - Stockage de combustible dans un système d'alimentation en combustible - Google Patents

Stockage de combustible dans un système d'alimentation en combustible

Info

Publication number
EP2148982A2
EP2148982A2 EP08761703A EP08761703A EP2148982A2 EP 2148982 A2 EP2148982 A2 EP 2148982A2 EP 08761703 A EP08761703 A EP 08761703A EP 08761703 A EP08761703 A EP 08761703A EP 2148982 A2 EP2148982 A2 EP 2148982A2
Authority
EP
European Patent Office
Prior art keywords
fuel
pressure
recess
channel
space
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
EP08761703A
Other languages
German (de)
English (en)
Other versions
EP2148982B1 (fr
Inventor
Kjell Eklund
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.)
Wartsila Finland Oy
Original Assignee
Wartsila Finland Oy
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 Wartsila Finland Oy filed Critical Wartsila Finland Oy
Publication of EP2148982A2 publication Critical patent/EP2148982A2/fr
Application granted granted Critical
Publication of EP2148982B1 publication Critical patent/EP2148982B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • 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
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • 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
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • 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
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

Definitions

  • the present invention relates to a fuel storage for a fuel feed system of a piston engine.
  • a high-pressure fuel storage such as a high-pressure accumulator or a so-called common rail.
  • the fuel is fed further along separate pipes to the injection nozzle of each cylinder. From the injection nozzles the fuel is led to the respective combustion chambers of the cylinders at a desired moment according to the operation of the engine.
  • the fuel pressure in a high-pressure fuel storage is high, even 2000 bar, whereby the fuel accumulator is exposed to strong stresses resulting in cracks that may develop in its construction material, especially in the area of the openings in the fuel storage wall and sharp-edged cross-sectional changes thereof.
  • the document EP 1413744 discloses a fuel storage for a piston engine, where the fuel space consists of two elongated cylindrical bores, which are arranged so as to partially overlap in cross-section.
  • the object of the invention is to increase the pressure strength of the fuel storage of a fuel feed system.
  • the object according to the invention is achieved as disclosed in the appended claim 1.
  • the fuel storage of a fuel feed system according to the invention comprises a channel which opens into the fuel space of the fuel storage. At the orifice of the channel in the fuel space there is a trough- shaped recess extending only over a portion of the length of the fuel space.
  • the recess at the orifice that opens into the fuel space reduces substantially the stresses exerted on the fuel storage in the area of the orifice. This, in turn, reduces the risk of crack formation in the construction material of the fuel space body thus increasing the durability of the component. Furthermore, it is easy to make a recess also in conjunction with existing fuel storages.
  • Figure 1 shows schematically a fuel feed system of a diesel engine
  • Figure 2 is a cross-sectional view of one fuel accumulator according to the invention.
  • Figure 3 shows the fuel accumulator of Fig. 2 sectioned along the line A-A;
  • Figure 4 shows another fuel accumulator according to the invention
  • FIG. 5 shows the fuel accumulator of Fig. 4 sectioned along the line B-B.
  • Fig. 1 shows a fuel feed system 28 of a diesel engine comprising several cylinders, especially a large diesel engine. Large diesel engine refers here to such engines that can be used, e.g., as main or auxiliary engines in ships or in power plants for the production of electricity and/or heat.
  • Fuel is fed from a fuel tank 1 by a low-pressure pump 2 along a low-pressure piping 3 to high-pressure pumps 4.
  • the pressure in the low-pressure piping 3 is typically about 7 bar.
  • the low-pressure piping 3 is provided with a relief valve 5, by which the low-pressure piping 3 can be reconnected to the fuel tank 1.
  • a desired constant pressure is maintained in the low-pressure piping 3 by means of the relief valve 5.
  • a simple throttle member may be used to maintain the constant pressure in the low-pressure piping 3.
  • each cam member 8 may include several cams, and thereby, when a high-pressure pump 4 provides a certain volume flow rate per time unit into a pressure accumulator unit, the outer dimensions of the pump may respectively be kept smaller and accordingly, the pressure shocks provided by it to the pressure accumulator are smaller.
  • each high-pressure pump 4 is connected by means of a high-pressure line 11 to a high-pressure fuel storage of its own, such a pressure accumulator 12.
  • the pressure accumulator 12 is, in turn, connected by separate pipes 14 to injection nozzles 15 of the cylinders.
  • Each pressure accumulator 12 is connected to two or more injection nozzles 15.
  • the arrangement may also be realised so that there are fewer high-pressure pumps 4 than pressure accumulators 12, whereby each high-pressure pump 4 supplies fuel to several pressure accumulators.
  • the fuel feed system has for instance two or more pressure accumulators 12 per one high-pressure pump 4 or three or more pressure accumulators 12 per two high-pressure pumps 4.
  • the high- pressure fuel storage may be a so-called common rail, to which fuel is fed by one or more high-pressure pumps and from which fuel is fed along separate pipes to two or more injection nozzles 15.
  • the pressure accumulators 12 are connected to one another by means of a pipe 13 in order to equalise the pressure differences between the accumulators.
  • the fuel pressure in the pressure accumulator 12 is over 800 bar, typically 1000 - 2000 bar.
  • the operation of high-pressure pumps 4 and the injection pressures to be used can be controlled in accordance with the engine load, operating speed or other parameters in a manner known as such.
  • Only one or several pressure accumulators 12 in the system is/are provided with an auxiliary valve 16, the operation of which is controlled by a pre- control valve 17 attached to the servo oil circuit of the engine.
  • a servo oil pump 18 maintains a pressure of about 100 bar in the servo oil circuit.
  • the servo oil circuit is utilised in a manner know per se also in the injection valves 15 to control the fuel injection together with a conventional solenoid valve (not shown).
  • the pressure accumulators 12 of the system may be connected through a line 19 to the fuel tank 1.
  • the pressure accumulators 12 may be de-pressurised by means of the valve 16.
  • valve 16 makes it possible to circulate fuel, especially heavy fuel oil, in the system for instance for the purpose of heating it before starting the engine.
  • fuel especially heavy fuel oil
  • the valve 16 may also be ensured by means of the valve 16 that the flow passes through every pressure accumulator 12.
  • the valve 16 may with advantage act as a pressure relief valve since, in any case, the high-pressure circuit of the system also requires a pressure relief valve.
  • the high-pressure fuel storage 12 may be used as pressure accumulators.
  • the fuel storage 12 comprises a body 20 with an elongated fuel space 21 for pressurised fuel.
  • the fuel space 21 is cylindrical.
  • the cross-section of the fuel space 21 is circular.
  • the diameter D, D' of the fuel space 21 is 20 - 100 mm.
  • the body 20 comprises a feed channel 22, which opens into the fuel space 21, through which channel pressurised fuel is led into the fuel space 21 from the high-pressure pump 4 along the high-pressure line 11.
  • the edge of the orifice of the feed channel 22 facing the fuel space 21 is rounded.
  • the cross-section of the feed channel 22 has a circular shape.
  • the orifice 25 of the feed channel 22 in the body 20 is located in the middle of the fuel space 21 in its longitudinal direction, i.e. in the direction of the middle axis 26.
  • the body 20 comprises discharge channels 23, which open into the fuel space 21, through which channels fuel is discharged from the fuel space 21 and led along the pipes 14 to the injection nozzles 15. There is one discharge channel 23 per each injection nozzle, which is in flow connection with the high-pressure fuel storage 12.
  • the orifices of the discharge channels 23 are located in the proximity of the end of the fuel space 21.
  • the inner surface of the fuel space 21 in the body 20 is provided with a trough-shaped recess 24 or two trough-shaped recesses 24', which are located at the orifice 25 of the feed channel 22.
  • the recess 24, 24' extends only over a portion of the length of the fuel space 21.
  • the recess 24, 24' is elongated. Typically, the length of the recess 24, 24' is less than a half of the length of the fuel space 21.
  • the recesses 24, 24' are cylindrical.
  • the longitudinal axis 27 of the recess 24, 24' is parallel with the longitudinal axis 26 of the fuel space 21.
  • a recess 24, 24' may be made on the inner wall of the fuel storage for instance by milling. After the machining of the recess, the edge of the orifice of the feed channel 22 facing the fuel space 21 is rounded for instance by means of abrasion liquid.
  • the radius of curvature R is selected according to the dimensions of the fuel storage. The radius of curvature R is at least 0.5 mm.
  • the cross-section of the recess 24 is curved, preferably having a shape of a circular arc.
  • the shape of the cross-section is constant or essentially constant over the entire length of the recess 24.
  • the recess 24 is made e.g. by milling.
  • the midpoint of the orifice 25 of the feed channel 22 is both in the cross direction and in the longitudinal direction of the fuel space 21, i.e. in the direction of the middle axis 26, located in the middle of the recess 24.
  • An extension of the recess 24 with a shape of a circular arc is marked by a dashed line in Fig. 2.
  • the diameter d of the recess 24 is selected so that the extension of the recess 24 passes via the middle axis 26 of the fuel space 21.
  • the diameter of the recess 24 is d and the depth of the midpoint of the recess 24 is h, whereby the ratio h/d is between 0.05 and 0.2.
  • the ratio of the breadth w of the recess 24 to the diameter Sd of the feed channel 22 is typically 2 - 5.
  • the ratio of the length L of the recess 24 to the diameter Sd of the feed channel 22 is 2 - 5.
  • the body 20 is, at the orifice 25 of the feed channel 22, provided with two trough-shaped recesses 24', which are arranged so that their cross-sections partially overlap.
  • the recesses 24' are identical.
  • the recesses 24' intersect one another in the middle of the orifice 25 in the cross direction of the fuel space 21.
  • the recesses 24' are parallel.
  • the cross-sections of the recesses 24' are curved, preferably having a shape of a circular arc.
  • the cross-section of the recesses 24' is constant or essentially constant over their entire length.
  • the midpoint of the orifice 25 of the feed channel 22 is located in the midpoint of the recesses 24' in the longitudinal direction of the fuel space 21.
  • the recesses 24' are arranged symmetrically with respect to the midpoint of the orifice 25 of the feed channel 22.
  • the diameter of the recess 24' with a shape of a circular arc is d' and the depth of the recess 24' is h', whereby the ratio h'/d' is between 0.05 and 0.2.
  • Extensions of two recesses 24' having a shape of a circular arc are marked by dashed lines in Fig. 4.
  • the diameters d' of the recesses 24' are selected so that the extensions pass via the middle axis 26 of the fuel space 21 '.
  • the breadth w' of the recess 24' is almost equal to the diameter D 1 of the fuel space.
  • the breadth w' of the recess 24' may be for instance 80 - 95 % of the diameter D' of the fuel space.
  • the ratio of the length L' of the recess 24' to the diameter Sd of the feed channel 22 is 2 - 5.
  • the depth h, h' of the recess 24, 24' is 3 - 10 % of the diameter D, D' of the fuel space 21.
  • Recesses 24, 24' may be arranged in a similar way also in the area of another orifice that opens into the fuel space 21, 21 ', for instance in the area of the discharge channel 23. There may be more than one feed channel that open into the fuel space 21, whereby a recess 24 or recesses 24' are preferably arranged at the orifice of each feed channel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un stockage de combustible (12) dans un système d'alimentation en combustible d'un moteur à piston, comprenant un corps (20) définissant un espace de combustible (21) pour un combustible pressurisé, et au moins un canal (22) qui s'ouvre dans l'espace de combustible (21). A l'orifice (25) du canal (22) se trouve une cavité (24, 24') en forme d'auge, qui s'étend seulement sur une partie de la longueur de l'espace de combustible (21).
EP08761703A 2007-05-31 2008-05-27 Stockage de combustible dans un système d'alimentation en combustible Active EP2148982B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20075394A FI120844B (fi) 2007-05-31 2007-05-31 Polttoaineen syöttöjärjestelmän polttoainevarasto
PCT/FI2008/050307 WO2008145818A2 (fr) 2007-05-31 2008-05-27 Stockage de combustible dans un système d'alimentation en combustible

Publications (2)

Publication Number Publication Date
EP2148982A2 true EP2148982A2 (fr) 2010-02-03
EP2148982B1 EP2148982B1 (fr) 2011-05-18

Family

ID=38069561

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08761703A Active EP2148982B1 (fr) 2007-05-31 2008-05-27 Stockage de combustible dans un système d'alimentation en combustible

Country Status (6)

Country Link
EP (1) EP2148982B1 (fr)
KR (1) KR101440658B1 (fr)
CN (1) CN101680409B (fr)
AT (1) ATE510125T1 (fr)
FI (1) FI120844B (fr)
WO (1) WO2008145818A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016135369A1 (fr) * 2015-02-23 2016-09-01 Wärtsilä Finland Oy Système d'injection de carburant

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2299102A1 (fr) * 2009-09-07 2011-03-23 OMT Officine Meccaniche Torino S.p.A. Accumulateur de combustible haute pression pour systèmes d'injection à rampe commune
EP2511517B1 (fr) 2011-04-15 2015-04-01 Wärtsilä Schweiz AG Rail fluide haute pression

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI107831B (fi) 1998-05-20 2001-10-15 Waertsilae Tech Oy Ab Polttoaineensyöttöjärjestelmä
DE19948339C1 (de) * 1999-10-07 2000-12-14 Bosch Gmbh Robert Kraftstoffhochdruckspeicher
DE19949963A1 (de) * 1999-10-16 2001-04-26 Bosch Gmbh Robert Verfahren zum Herstellen eines Kraftstoffhochdruckspeichers
DE19949962A1 (de) * 1999-10-16 2001-04-26 Bosch Gmbh Robert Kraftstoffhochdruckspeicher und Verfahren zur Herstellung eines Kraftstoffhochdruckspeichers
DE10152261A1 (de) * 2001-10-20 2003-04-30 Bosch Gmbh Robert Hochdruckspeicher wie Kraftstoffhochdruckspeicher
DE50302044D1 (de) 2002-10-23 2006-02-02 Waertsilae Nsd Schweiz Ag Druckspeicher für ein Common Rail System
US7021291B2 (en) * 2003-12-24 2006-04-04 Cummins Inc. Juncture for a high pressure fuel system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008145818A2 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016135369A1 (fr) * 2015-02-23 2016-09-01 Wärtsilä Finland Oy Système d'injection de carburant

Also Published As

Publication number Publication date
CN101680409A (zh) 2010-03-24
KR20100019531A (ko) 2010-02-18
CN101680409B (zh) 2011-11-16
KR101440658B1 (ko) 2014-09-19
WO2008145818A3 (fr) 2009-01-22
WO2008145818A2 (fr) 2008-12-04
FI120844B (fi) 2010-03-31
ATE510125T1 (de) 2011-06-15
FI20075394A0 (fi) 2007-05-31
FI20075394L (fi) 2008-12-01
EP2148982B1 (fr) 2011-05-18

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