FI123570B - fuel injector - Google Patents

fuel injector Download PDF

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Publication number
FI123570B
FI123570B FI20125450A FI20125450A FI123570B FI 123570 B FI123570 B FI 123570B FI 20125450 A FI20125450 A FI 20125450A FI 20125450 A FI20125450 A FI 20125450A FI 123570 B FI123570 B FI 123570B
Authority
FI
Finland
Prior art keywords
fuel
space
injector
control piston
outlet
Prior art date
Application number
FI20125450A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI20125450A (en
Inventor
Vesa Voutilainen
Original Assignee
Waertsilae 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 Waertsilae Finland Oy filed Critical Waertsilae Finland Oy
Priority to FI20125450A priority Critical patent/FI123570B/en
Priority to PCT/FI2013/050416 priority patent/WO2013160536A1/en
Priority to CN201380020008.8A priority patent/CN104302905B/en
Priority to KR1020147032020A priority patent/KR102012162B1/en
Priority to EP13718873.6A priority patent/EP2852752B1/en
Application granted granted Critical
Publication of FI20125450A publication Critical patent/FI20125450A/en
Publication of FI123570B publication Critical patent/FI123570B/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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
    • F02M47/027—Electrically actuated valves draining the chamber to release the 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic

Description

Fuel injector
The invention relates to a fuel injector for a reciprocating engine.
5 In diesel engines, the fuel is injected as a fine mist from the fuel injector into the combustion space of the cylinder such that with eddies of air is achieved a good mixture of fuel and combustion air and combustion that is as perfect as possible. Fuel injected by the fuel injector as tiny droplets vaporizes quickly as combustion begins after a short ignition delay. A spring-loaded injector needle is typically used 10 as a shut-off element in the fuel injector. The injector needle is generally guided hydraulically by the pressure of the fuel or other hydraulic fluid.
Due to ever more stringent emissions regulations, the emissions created by diesel engines must be decreased. It is, however, at the same time desired that the per-15 formance of the engine be kept at the same level or even improved. One means of achieving these goals is to adjust with greater accuracy the amount of fuel injection and the timing and duration of injection during the injection event. The accuracy of adjustment of fuel injection can be improved by guiding the injector needle of the fuel injector by a piezoelectric actuator.
20
An object of the present invention is to provide an improved fuel injector for a reciprocating engine.
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δ ™ According to the invention, this object can be achieved by a fuel injector according ° 25 to claim 1. The fuel injector according to the invention comprises an injector body ^ having a fuel chamber for storing fuel before injection, a nozzle opening through
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a. which fuel is injected into a cylinder of the engine, an injector needle for opening g and closing flow communication between the fuel chamber and the nozzle opening, a fuel inlet for feeding pressurized fuel into the fuel chamber, a fuel outlet for dis-^ 30 charging fuel from the fuel injector and a movable control piston, a fuel space de- 2 limited by the control piston and the injector needle, wherein fuel pressure in the fuel space is arranged to press the injector needle toward a closed position. The fuel injector according to the invention further comprises a first outlet flow path for connecting the fuel space to the fuel outlet, a second outlet flow path for connect-5 ing the fuel space to the fuel outlet and a piezoelectric actuator for opening and closing the flow communication through the first outlet flow path. The control piston has a first position, where the fuel space is in flow communication with the fuel inlet and the flow communication between the fuel space and the fuel outlet is closed, and a second position, where the fuel space is in flow communication with the fuel 10 outlet 18 through first outlet flow path and the second outlet flow path.
Considerable advantages can be achieved by means of the present invention. The fuel injector according to the invention comprises two passages through which pressure prevailing in the fuel space is released when the piezoelectric actuator 15 opens the flow communication through the other passage. In this way the movement of the piezoelectric actuator can be quickly forwarded to the injector needle. This enables fast and accurate injection control. The stroke of the piezoelectric actuator is typically quite limited. In the fuel injector according to the invention the travelling length of the piezoelectric actuator can be multiplied by a suitable dimen-20 sioning of the fuel space. Thus, the travelling length of the injector needle is multiple compared to that of the piezoelectric actuator.
^ According to an embodiment of the invention the control piston surface that delim- ^ its the fuel space comprises a projection, inside which the fuel space is arranged.
'nI' ° 25 The second flow path comprises a collector space that surrounds the projection.
™ When the control piston is in its first position, the projection is against the injector
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£ body and thus closes the flow communication between the fuel space and the col- g lector space. When the control piston moves toward the second position, the flow ^ communication is opened between the fuel space and the collector space through ^ 30 a gap between the projection and the injector body. As the gap between the projec- 3 tion and the injector body has a relatively large cross-sectional flow area, fuel pressure prevailing in the fuel space can be quickly released. This increases the opening speed of the injector needle.
5 In the following the invention will be described by way of an example with reference to the accompanying drawings, in which
Figure 1 shows a fuel injector according to an embodiment of the present invention in its closed position, 10
Figure 2 is a partial enlargement of the portion A shown in fig. 1.
Figure 3 shows the fuel injector of fig. 1 in its open position.
15 Figure 4 is a partial enlargement of the portion B shown in fig. 3.
Figure 5 shows a fuel injector according to another embodiment of the present invention.
20 The drawings disclose a fuel injector 1 for a diesel engine. The engine can be a large diesel engine, which refers here to such engines that can be used for instance as main and auxiliary engines in ships or in power plants for production of heat and/or electricity. The engine is provided with a common rail fuel injection sys-o ^ tern, in which fuel is fed by means of a high pressure pump into a pressure accu- ° 25 mulator, from which it is led into the fuel injector 1. From the fuel injector 1 fuel is ^ injected into a cylinder 4 of the engine.
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g The fuel injector 1 comprises an injector body 2, which has a fuel chamber 3 for oj storing fuel before injection into the cylinder 4. The fuel chamber 3 is arranged to cm 30 receive pressurized fuel from the pressure accumulator. The fuel injector 1 com- 4 prises a fuel inlet 5 for feeding pressurized fuel into the fuel chamber 3. The fuel inlet 5 is in flow communication with the pressure accumulator. The fuel inlet 5 is in continuous flow communication with the fuel chamber 3 through an inlet duct 6.
The fuel injector 1 further comprises a fuel outlet 18 for discharging fuel from the 5 injector 1. Fuel pressure at the fuel outlet 18 is lower than fuel pressure at the fuel inlet 5.
The fuel injector 1 comprises at least one nozzle opening 7, through which fuel is injected from the fuel chamber 3 into the cylinder 4. The fuel injector 1 further com-10 prises an injector needle 8 for opening and closing the flow communication between the fuel chamber 3 and the nozzle opening(s) 7. The first end of the injector needle 8 extends into the fuel chamber 3. The fuel injector 1 comprises a spring 9, which is arranged to press the injector needle 8 toward its closed position, in which flow communication is closed between the fuel chamber 3 and the nozzle open-15 ing(s) 7. The spring 9 is placed in a spring chamber 25, which is in flow communication with the fuel outlet 18. The spring chamber 25 collects fuel that leaks from the fuel chamber 3 through a clearance between the injector needle stem and the injector body 2. The force caused by the fuel pressure in the fuel chamber 3 presses the injector needle 8 towards its open position, in which flow communication is 20 open between the fuel chamber 3 and the nozzle opening(s) 7. The injector needle 8 is provided with a collar 24, on which the fuel pressure in the fuel chamber 3 acts to move the injector needle 8.
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δ ^ The fuel injector 1 comprises a movable control piston 10. The control piston 10 is ° 25 movable in the direction of the longitudinal axis of the injector needle 8. The control ^ piston 10 faces the injector needle 8. The control piston 10 has a first surface 12
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£ that faces the injector needle 8. Further, the control piston 10 has a second surface g 13 that faces the injector body 2. The first surface 12 and the second surface 13 ^ are on the opposite sides of the control piston 10. The control piston 10 comprises £3 30 a connecting duct 14, which forms flow communication between the first surface 12 5 and the second surface 13. The control piston 10 can be a cylindrical part, the ends of which form the first surface 12 and the second surface 13.
The fuel injector 1 further comprises a fuel space 15, which is delimited by the con-5 trol piston 10 and the injector needle 8. The fuel space 15 is delimited by the first surface 12 of the control piston 10 and the second end of the injector needle 8. Force caused by the fuel pressure in the fuel space 15 is arranged to press the injector needle 8 toward its closed position. The connecting duct 14 forms flow communication between the fuel space 15 and the second surface 13.
10
The first surface 12 of the control piston 10 is provided with a projection 27, inside which the fuel space 15 is located. The projection 27 can be annular. A collector space 26 is arranged between the control piston 10 and the injector body 2. The collector space 26 surrounds partially or entirely the projection 27. The collector 15 space 26 is in flow communication with the fuel outlet 18.
The fuel injector 1 is provided with a first outlet duct 21, which is in flow communication with the fuel outlet 18. The fuel injector 1 is also provided with a second outlet duct 22 which is in flow communication with the fuel outlet 18. The collector 20 space 26 is in flow communication with the second outlet duct 22. A discharge duct 19 connects the first outlet duct 21 and the second outlet duct 22 to the fuel outlet 18. The connecting duct 14, the first outlet duct 21 and the discharge duct 19 form a first outlet flow path that connects the fuel space 15 to the fuel outlet 18. The col-^ lector space 26, the second outlet duct 22 and the discharge duct form a second ° 25 outlet flow path that connects the fuel space 15 to the fuel outlet 18.
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£ The fuel injector 1 further comprises a piezoelectric actuator 17 for guiding the in- § jector needle 8 i.e. for moving it between the open and closed positions. The pie- ο] zoelectric actuator 17 is arranged to open and close flow communication through cm 30 the first outlet flow path i.e. through the first outlet duct 21. The function of the pie- 6 zoelectric actuator 17 is based on the piezoelectric phenomenon. The actuator 17 comprises piezo elements 29 made of a piezoelectric material. The length of piezo elements 29 changes in response to an electrical field. The piezo elements 29 comprise piezo crystals, which are ordinarily made from PZT ceramics, which 5 comprise lead, zirconium and titanium. The piezo elements 29 are arranged one above the other to form a piezo stack. The actuator 17 comprises a control needle 20 that is attached to the piezo element 29 of the piezo stack. Depending on the position of the piezoelectric actuator 17, the control needle 20 either opens or closes the flow communication through the first outlet duct 21.
10
The control piston 10 has a first position, where the fuel space 15 is in flow communication with the fuel inlet 5 (fig. 1). The fuel space 15 is in flow communication with the fuel inlet 5 through the connecting duct 14 and a gap 16, which is between the second surface 13 of the control piston and the injector body 2. A feed duct 23 15 is arranged between the inlet duct 6 and the gap 16. In the first position of the con trol piston 10, the flow communication between the fuel space 15 and the fuel outlet 18 is closed. The control needle 20 closes the flow communication through the first outlet flow path. Further, the flow communication from the fuel space 15 to the fuel outlet 18 through the second outlet flow path is closed by the projection 27, 20 which is against the injector body 2 and thus closes the flow communication from the fuel space 15 to the collector space 26.
The control piston 10 has a second position, where the fuel space 15 is in flow ^ communication with the fuel outlet 18 through the first outlet flow path and the se- ° 25 cond outlet flow path (fig. 3). The fuel space 15 is in flow communication with the ^ collector space 26 through a gap 11 between the projection 27 and the injector
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£ body 2. The flow communication between the fuel space 15 and the fuel inlet 5 is § closed. The second surface 13 of the control piston 10 is against the injector body sj- ej 2. Due to high fuel pressure, some fuel flows from the feed duct 23 to the first out- ° 30 let duct 21 along the gap 16 between the second surface 13 and the injector body 7 2. The second end of the injector needle 8 is against the first surface 12 of the control piston. Further, in the second position of the control piston 10, the connecting duct 14 is in flow communication with the fuel 18 outlet via the first outlet duct 21. When the control piston 10 is in the second position, the effective cross-sectional 5 flow area of the feed duct 23 is smaller than that of the first outlet duct 21.
To initiate the fuel injection, the piezoelectric actuator 17 is energized. The piezoelectric actuator 17 opens the flow communication from the fuel space 15 to the fuel outlet 18. This is achieved by the control needle 20, which opens the flow commu-10 nication through the first outlet duct 21. Consequently, fuel pressure in the fuel space 15 is released through the connecting duct 14 and the first outlet duct 21. The control piston 10 moves from its first position toward the second position. Simultaneously the flow communication is opened from the fuel space 15 to the collector space 26 through the gap 11 between the injector body 2 and the projection 27. 15 This further releases the fuel pressure in the fuel space 15. Force caused by the fuel pressure in the fuel chamber 3 moves the injector needle 8 to its open position and the fuel injection through the nozzle openings 7 into the cylinder 4 starts.
To terminate the fuel injection, the piezoelectric actuator 17 is de-energized. The 20 piezoelectric actuator 17 closes the flow communication between the fuel space 15 and the fuel outlet 18. This achieved by the control needle 20, which closes the flow communication through the first outlet duct 21. Fuel pressure in the fuel inlet 5 acts on the second surface 13 of the control piston and presses the control piston ^ 10 toward its first position. Simultaneously flow communication is opened between ^ 25 the fuel inlet 5 and the fuel space 15. The control piston 10 closes the flow com- ^ munication from the fuel space 15 to the collector space 26. The fuel pressure act-
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£ ing on the second end of the injector needle 8 presses the injector needle 8 to its § closed position and the fuel injection through the nozzle openings 7 into the cylin- ej der 4 stops.
§ 30 8
Figure 5 shows an embodiment where the spring chamber 25 is in flow communication with the fuel chamber 3 vial a clearance 28 between the injector needle 8 and the injector body 2. The spring chamber 25 is not in flow communication with the fuel outlet 18. In this embodiment the amount of fuel leaking from the injector 1 5 can be reduced. In other respects the embodiment of fig. 5 is similar to the embodiment of figs. 1-4.
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Claims (11)

1. Polttoaineinjektori (1) mäntämoottoria varten, jolloin polttoaineinjektori (1) käsittää - injektorirungon (2), jossa on polttoainekammio (3) polttoaineen varastoimiseksi 5 ennen ruiskutusta, - suutinaukon (7), jonka kautta ruiskutetaan polttoainetta moottorin sylinteriin (4), - injektorineulan (8) polttoainekammion (3) ja suutinaukon (7) välisen virtausyhteyden avaamiseksi ja sulkemiseksi, polttoaineen tuloaukon (5) paineistetun polttoaineen syöttämiseksi 10 polttoainekammioon (3), ja - polttoaineen poistoaukon (18) polttoaineen poistamiseksi polttoaineinjektorista (1), tunnettu siitä, että polttoaineinjektori (1) lisäksi käsittää - liikkuvan säätömännän (10), 15. säätömännän (10) ja injektorineulan (8) rajaaman polttoainetilan (15), jolloin polttoainetilassa (15) vallitseva polttoaineen paine on järjestetty painamaan injektorineulaa (8) suljettua asentoa kohti, - ensimmäisen ulosvirtaustien (14, 21, 19) polttoainetilan (15) yhdistämiseksi polttoaineen poistoaukkoon (18), 20. toisen ulosvirtaustien (26, 22, 19) polttoainetilan (15) yhdistämiseksi polttoaineen poistoaukkoon (18), - pietsosähköisen toimilaitteen (17, 20) virtausyhteyden avaamiseksi ja sulkemiseksi ensimmäisen ulosvirtaustien (14, 21, 19) kautta, ja ^ jolla säätömännällä (10) on ensimmäisen asento, jossa polttoainetila (15) on ^1" ° 25 virtaustyhteydessä polttoaineen tuloaukon kanssa (5) ja jossa polttoainetilan (15) ja polttoaineen poistoaukon (18) välinen virtausyhteys on suljettu, ja toinen asento, X £ jossa polttoainetila (15) on virtausyhteydessä polttoaineen poistoaukkoon (18) g ensimmäisen ulosvirtaustien (14, 21, 19) ja toisen ulosvirtaustien (26, 22, 19) ou kautta. § 30 10A fuel injector (1) for a piston engine, wherein the fuel injector (1) comprises: - an injector body (2) having a fuel chamber (3) for storing fuel 5 before injection, - a nozzle opening (7) for injecting fuel into the engine cylinder (4), an injection needle (8) for opening and closing the flow connection between the fuel chamber (3) and the nozzle orifice (7), for supplying pressurized fuel to the fuel inlet (5) to the fuel chamber (3), and - the fuel outlet (18) for discharging the fuel injector (1) further comprising: - a fuel compartment (15) delimited by a movable control piston (10), a control piston (10) and an injection needle (8), wherein the fuel pressure prevailing in the fuel compartment (15) is arranged to press the injection needle (8) combustion for combining a first outflow path (14, 21, 19) with a fuel space (15) to the fuel outlet (18), 20. for connecting the second outflow path (26, 22, 19) to the fuel outlet (15), to open and close the flow connection of the piezoelectric actuator (17, 20) through the first outflow path (14, 21, 19). and a control piston (10) having a first position in which the fuel space (15) is in a flow relationship with the fuel inlet (5) and the flow connection between the fuel space (15) and the fuel outlet (18) is closed, and , X £ wherein the fuel space (15) is in fluid communication with the fuel outlet (18) g through a first outflow path (14, 21, 19) and a second outflow path (26, 22, 19) ou. § 30 10 2. Patenttivaatimuksen 1 mukainen polttoaineinjektori, tunnettu siitä, että säätömäntä (10) on järjestetty liikkumaan toisesta asennosta ensimmäiseen asentoon, kun virtausyhteys ensimmäisen ulosvirtaustien (14, 21, 19) kautta suljetaan. 5Fuel injector according to claim 1, characterized in that the control piston (10) is arranged to move from the second position to the first position when the flow connection through the first outflow path (14, 21, 19) is closed. 5 3. Patenttivaatimuksen 1 tai 2 mukainen polttoaineinjektori, tunnettu siitä, että säätömäntä (10) on järjestetty liikkumaan ensimmäisestä asennosta toiseen asentoon, kun virtausyhteys ensimmäisen ulosvirtaustien (14, 21, 19) kautta avataan. 10Fuel injector according to Claim 1 or 2, characterized in that the control piston (10) is arranged to move from the first position to the second position when the flow connection through the first outflow path (14, 21, 19) is opened. 10 4. Patenttivaatimuksen 1 mukainen polttoaineinjektori, tunnettu siitä, että säätömännällä (10) on ensimmäinen pinta (12), joka rajaa polttoainetilaa (15), toinen pinta (13), ja että ensimmäinen virtaustie käsittää yhdyskanavan (14) virtausyhteyden muodostamiseksi ensimmäisen pinnan (12) ja toisen pinnan (13) 15 välille.Fuel injector according to claim 1, characterized in that the adjusting piston (10) has a first surface (12) defining a fuel space (15), a second surface (13), and the first flow path comprises a connecting channel (14) for forming a flow connection ) and the second surface (13) 15. 5. Patenttivaatimuksen 4 mukainen polttoaineinjektori, tunnettu siitä, että säätömännän (10) ollessa ensimmäisessä asennossaan polttoainetila (15) on virtausyhteydessä polttoaineen tuloaukkoon (5) yhdyskanavan (14) sekä toisen 20 pinnan (13) ja injektorirungon (2) välisen raon (16) kautta.Fuel injector according to Claim 4, characterized in that, when the control piston (10) is in its first position, the fuel space (15) is in fluid communication with the fuel inlet (5) and the gap (16) between the second surface (13) and the injector body (2). through. 6. Patenttivaatimuksen 5 mukainen polttoaineinjektori, tunnettu siitä, että ensimmäinen ulosvirtaustie käsittää ensimmäisen poistokanavan (21), joka on ^ virtausyhteydessä yhdyskanavaan (14), kun säätömäntä (10) on toisessa ^1" ° 25 asennossaan, ja siitä, että pietsosähköinen toimilaite on järjestetty avaamaan ja sulkemaan virtausyhteys ensimmäisen poistokanavan (21) kautta. CC CLFuel injector according to Claim 5, characterized in that the first outflow path comprises a first outlet conduit (21) which is in flow communication with the connecting conduit (14) when the regulating piston (10) is in its second position 1-100 ° and that the piezoelectric actuator arranged to open and close the flow connection through the first outlet (21) CC CL 7. Patenttivaatimuksen 4 mukainen polttoaineinjektori, tunnettu siitä, että ou säätömännän (10) ensimmäinen pinta (12) on varustettu ulkonemalla (27), jonka ° 30 sisäpuolella on polttoainetila (15). 11Fuel injector according to Claim 4, characterized in that the first surface (12) of the control piston (10) is provided with a protrusion (27) having a fuel space (15) inside it. 11 8. Patenttivaatimuksen 7 mukainen polttoaineinjektori, tunnettu siitä, että toinen virtaustie käsittää kokoojatilan (26), joka ympäröi ulkonemaa (27).A fuel injector according to claim 7, characterized in that the second flow path comprises a collector space (26) surrounding the protrusion (27). 9. Patenttivaatimuksen 8 mukainen polttoaineinjektori, tunnettu siitä, että säätömännän (10) ollessa toisessa asennossa polttoainetila (15) on virtausyhteydessä kokoojatilaan (26) ulkoneman (27) ja injektorirungon (2) välisen raon (11) kautta.Fuel injector according to claim 8, characterized in that, when the control piston (10) is in a second position, the fuel space (15) is in fluid communication with the accumulator space (26) through a gap (11) between the protrusion (27) and the injector body (2). 10. Patenttivaatimuksen 8 tai 9 mukainen polttoaineinjektori, tunnettu siitä, että säätömännän (10) ollessa ensimmäisessä asennossa ulkonema (27) on injektorirunkoa (2) vasten ja sulkee siten polttoainetilan (15) ja kokoojatilan (26) välisen virtausyhteyden.Fuel injector according to Claim 8 or 9, characterized in that, when the control piston (10) is in the first position, the protrusion (27) is against the injector body (2), thereby closing the flow connection between the fuel compartment (15) and the collector compartment (26). 11. Patenttivaatimuksen 5 mukainen polttoaineinjektori, tunnettu siitä, että injektori käsittää syöttökanavan (23) polttoaineen syöttämiseksi säätömännän toisen pinnan (13) ja injektorirungon (2) väliseen rakoon (16), ja että syöttökanavan (23) tehollinen poikkileikkauksen virtausala on pienempi kuin ensimmäisen poistokanavan (21) tehollinen poikkileikkauksen virtausala. CO δ c\j o X CC CL O m LO C\l O CMFuel injector according to Claim 5, characterized in that the injector comprises an inlet duct (23) for supplying fuel to the gap (16) between the second surface (13) of the control piston and the inlet duct (23) having an effective cross-sectional flow area (21) effective cross-sectional flow area. CO δ c \ j o X CC CL O m LO C \ l O CM
FI20125450A 2012-04-24 2012-04-24 fuel injector FI123570B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
FI20125450A FI123570B (en) 2012-04-24 2012-04-24 fuel injector
PCT/FI2013/050416 WO2013160536A1 (en) 2012-04-24 2013-04-16 Fuel injector
CN201380020008.8A CN104302905B (en) 2012-04-24 2013-04-16 Fuel injector
KR1020147032020A KR102012162B1 (en) 2012-04-24 2013-04-16 Fuel injector
EP13718873.6A EP2852752B1 (en) 2012-04-24 2013-04-16 Fuel injector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20125450 2012-04-24
FI20125450A FI123570B (en) 2012-04-24 2012-04-24 fuel injector

Publications (2)

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FI20125450A FI20125450A (en) 2013-07-15
FI123570B true FI123570B (en) 2013-07-15

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Country Status (5)

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EP (1) EP2852752B1 (en)
KR (1) KR102012162B1 (en)
CN (1) CN104302905B (en)
FI (1) FI123570B (en)
WO (1) WO2013160536A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3234341B1 (en) 2014-12-19 2019-02-06 Wärtsilä Finland Oy A fuel injector for an internal combustion piston engine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60020273T2 (en) * 1999-04-01 2006-01-19 Delphi Technologies, Inc., Troy Fuel injector
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KR20150003816A (en) 2015-01-09
EP2852752B1 (en) 2016-10-05
FI20125450A (en) 2013-07-15
CN104302905A (en) 2015-01-21
WO2013160536A1 (en) 2013-10-31
EP2852752A1 (en) 2015-04-01
KR102012162B1 (en) 2019-10-21
CN104302905B (en) 2016-08-17

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