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
  • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
  • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
  • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
  • F02M45/08—Injectors peculiar thereto
• • 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
  • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
  • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
  • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve 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
  • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
  • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
  • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
• • 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
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
  • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
• • 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
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator

Definitions

• This invention is concerned with an integrated filter which prevents the holes of injector nozzles in fuel injection systems having a precise mechanical structure as commonly used in internal combustion engines, from being clogged by solid particles resulting from fuel or injection system.
• the basic function of high pressure injection systems used in internal combustion engines is to inject fuel through the injector nozzle in order to create the required air/fuel mixture in a manner to ensure full combustion in the cylinder which forms the combustion chamber, within the operating range of the engine, in other words, depending on the revolution speed of the engine and on the power taken off therefrom.
• the formation of a good air/fuel mixture in a manner to ensure full combustion gradually becomes of greater importance in view of the emissions resulting from combustion as well as of the efficiency.
• substantial developments have been achieved in the fuel injection systems.
• the structure of fuel cluster injected through such narrowed and reshaped cross-sections of holes in the injector nozzle will be impaired, it may cause deviations from the conditions of forming a proper mixture determined during design and development stage as well as increases in exhaust emissions by effecting the combustion event in the cylinder.
• the aforesaid narrowing or clogging in the injector nozzle may be due to solid particles or due to wears in pump, fuel line and injector in the fuel injection system, and it also depends on the quality of fuel used. Such a case may cause a substantial increase in maintenance expenses in addition to occurrence of such adversities as loss of power in the engine and increase in exhaust emissions, depending on the aforesaid conditions.
• the filter mentioned here is named as an integrated filter since it is directly incorporated within the injector body.
• Direct incorporation of the filtering system within the injector body does not require major modifications due to simplicity of its structure.
• the clogging of a part of the holes provided on the filter element over time does not cause a substantial narrowing of cross-section because of the numerous holes provided on an integrated filter element and thus the increase in resistance against fuel flow is prevented.
• an integrated filter element will have a longer operation life.
• the use of such an integrated filter will also eliminate the need for installing a separate external filter element in the fuel injection system.
• Figure 1 Injector unit provided with an integrated filter.
• Figure 2. An integrated filter element.
• the unit being the subject matter of the invention which is defined as an integrated filter, is incorporated within the injector body (1) located at the very end of the fuel injection system as seen in Figure 1, while the detailed view of an integrated filter unit is shown in Figure 2.
• Fuel from injection pump passing through the fuel line and/or in common rail systems, through a valve located at the injector inlet reaches the filter volume (2) provided at a location closer to the upper side of the injector body.
• the integrated filter element is usually positioned where the pressure chamber is located in the fuel line within the injector.
• the volume (2) within the injector body reached by the fuel before it is filtered has a ring shape, with its internal surface forming the filtration surface (3).
• Both the ring-shaped volume (2) and the filtration surface (3) are sized according to the structure of the injector body.
• an injector needle (5) is provided on the internal surface of the ring-shaped filtration surface (4).
• These holes (6) provided in the filtration surface (3, 4) are defined as the filtration holes (6) which function to filter the fuel.
• the quantity and diameter of such holes (6) in other words, their total cross-sectional area, are sized to minimize pressure drop or pressure loss during fuel flow.
• Another important condition is that the diameter of the aforesaid filtration holes (6) should be smaller than that of the injection holes (8) provided in the injector nozzle (7).
• Filter volume (2) is made such that it will further continue downward to some extent (10) starting from those of the filtration holes (6) provided in filtration surface (3, 4) which are located at the lower row relative to the injector body (11).
• the volume (12) at the lower surface where no filtration holes (6) are provided forms a zone defined as the collection volume (12) which has been sized in a manner to allow solid particles caught in the filter element to accumulate therein.
• the injector needle (5) located at the center of the injector body (1) has a chamfered (13) structure.
• the needle surface extended in size (14) by the chamfer (13) on injector needle is in contact with the internal surface (4) of the filtration ring.
• the needle surface extended in size (14) by the chamfer (13) can be sized such that the filtration holes (6) located on the inner surface (4) of filtration ring will be partially closed when the injector needle (5) is in closed position, in other words, when no injection operation is performed through the injection holes (8) in injector nozzle (7).
• Such a design that allows the external surface of needle (5) to cover a portion of the filtration holes (15) located on filtration ring when the needle is in closed position changes the cross-section of flow in the course of injection process proceeding from the start of injection, hence making a step-by- step injection possible.
• Such a structure besides its filtration action, is of use in preventing combustion knock or sudden pressure increase in the cylinder due to ignition delay of the injected fuel, particularly in diesel engines.
• an integrated filter has the possibility of use in the injectors provided in a series or a distributor type of pumping systems, in the electromagnetic- or piezoelectric-controlled high pressure common rail systems and in the unit pump systems containing a combined pump and injector.

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

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (3)

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Family Cites Families (9)

• 2004
  • 2004-08-18 TR TR2004/02049A patent/TR200402049A1/tr unknown
• 2005
  • 2005-08-17 EP EP05774132A patent/EP1787021A1/en not_active Withdrawn
  • 2005-08-17 WO PCT/EP2005/054060 patent/WO2006018440A1/en not_active Application Discontinuation

Non-Patent Citations (1)

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