• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention extends the range of control of the fuel injection phases. The device contains a low-pressure pump 3 for pre-injection of liquid fuel, a high-pressure pump 1 for a main injection, two fuel nozzles 6, 7 for additional and main injections, having needles 40, 41 with pressure chambers 42, 43, metering pump 8, in the housing 9 of which the transmitting piston 11 is installed with the formation of the motor 16 on one side and the receiving cavity 17 on the other side and with the possibility of reciprocating movement between the separately controlled cam drives 22, 23, a clear line and fuel lines, selectively linking pumps 1, 3 with chambers 42, 43 of the pressure of the needles of nozzles 6, 7 through the motor 16 and the receiving cavity 17, with the possibility of connecting the latter through an additional fuel line with the extreme position of the stop 12 of the motor cavity 16 and blocked by the transmitting the piston 11 of the hole 28. The needle 41 of the nozzle 7 of the main injection, when using gaseous fuel as the main one, is provided with connecting channels arranged to communicate the pressure chamber 43 with the drain when elevated dix needle and the fuel pipe 29 is further connected to the pump 1 via a check valve. Adjustable movable stops 12, 13 are located in the housing 9 of the metering pump 8 directly in the motor 16 and the receiving cavity 17 with the possibility of their axial movement so that their inner ends 14, 15 regulate the stroke of the transmitting piston 11. 2 s. and 2 z. p. f-ly, 5 ill.
    公开号:SU1554775A3
    申请号:SU874202379
    申请日:1987-03-13
    公开日:1990-03-30
    发明作者:Багена Мишель
    申请人:Сосьете Д,Этюд Де Машин Термик С.Э.М.Т. (Фирма)；
    IPC主号:
    专利说明:

    the possibility of reciprocating movement between separately adjustable cam drives 22, 23, a drain line and fuel lines, selectively connecting pumps 1,3c with pressure chambers 42, 43 of the needles of the nozzles 6, 7 through the motor 16 and the receiving cavity 17 with the possibility of connecting the latter through an additional fuel line with the extreme position of the stop 12 of the motor cavity 16 and the opening 29 blocked by the transfer piston 11, the Needle 41 of the main injection nozzle 7 when using gaseous fuel in
    as the main one is equipped with connecting channels arranged for communication, the camera 43
    pressure with a slip when the needle is lifted, and the fuel line 29 is additionally connected to the pump 1 via a check valve. Adjustable movable stops 12, 13 are located in
    the housing 9 of the metering pump 8 directly in the motor 16 and the receiving cavity 17 with the possibility of their axial movement so that their inner ends 14, 15 regulate the course of the transfer piston 11. 2 s. and 2 z. p. f-ly, 5 ill.
    The invention relates to the field of engineering, more specifically to the field of engine-building, and can be used in the design of an injection device for a dual-fuel internal combustion engine, which injects two types of fuel, one of which is liquid for preliminary injection and the other is liquid or gaseous for main injection. and also to the design of the metering pump for this device.
    The aim of the invention is to expand the range of regulation of the fuel injection phases.
    Figure 1 shows schematically an injection device with a metering pump when the fuel of the main injection is liquid fuel; Fig. 2 is the same when the fuel of the main injection is gaseous fuel; FIG. 3 shows a variant of adjustment of the metering pump with a pre-injection equal to zero; 4 is the same) with preliminary and main injection starting simultaneously; 5 is the same when the fuel of the main injection is gaseous fuel.
    An injection device for a dual-fuel internal combustion engine includes a high-pressure pump 1 of a piston type that supplies liquid or gaseous fuel from the main injection to the injection fuel line 2, a low-pressure pump 3 that supplies liquid top5
    0
    There is a preliminary injection unit in the fuel supply pipe 4, a nozzle unit 5, in which the preliminary injection nozzle 6 and the main injection nozzle 7, a metering pump 8 and fuel connecting pipes that connect all the elements of the device selectively are enclosed. The dosing pump 8 has a housing 9 with a drilling 10, in the middle part of which the transmitting piston 11 is mounted with the possibility of reciprocating movement, which alternates between separately adjustable stops 12 and 13. The stops 12 and 13 are pre-installed in the drilling 10 and have internal ends 14 and 15 respectively, which end faces
    0, the transfer piston 11 forms on the one side a motor 16, ac another - a receiving 17 cavity, and external ends 18, 19, which rest on the active surfaces 20, 21 of the cams
    5 22, 23, the axes 24, 25 of rotation of which are fixed with respect to the housing 9. A compression spring 26 can be installed between the transfer piston and the stop 13.
    0 I
    Housing 9 metering pump 8 in
    In the area of the motor cavity 16, there is an opening 27 connected to the fuel injection line 2, a high-pressure fuel pump 1, an opening 28 connected to the fuel pipe 29 connecting the engine cavity 16 to the main injection nozzle 7, and an additional opening 30.
    five
    The housing 9 of the metering pump 8 in the area of the receiving cavity 17 has an opening 31 connected to the fuel supply pipe 4 connecting the receiving cavity 17 to the low pressure fuel pump 3 via a check valve 32, an opening 33 connected to the fuel pipe 34 connecting the receiving cavity 17 with a pre-injection nozzle 6 through ot valve 35, and an additional orifice 36
    The additional holes 30 and 36 are interconnected by the fuel line 37. The nozzle block 5 consists of a housing 38 on which the tip 39 is fixed. In the case there are phosuns 6 and 7 of preliminary and main fuel injection, each of which has nozzles 39 of the same size located in the nipple 40 and 41 nozzles that interact with pressure chambers 42, 43 and corresponding seats 44, 45 and sawing holes 46, 47 Nozzles have a common calibration spring 48 located in housing 38 and holding needles 40, 41 on seats 44, 4 5 by means of a pusher 49 and a transfer crosspiece 50, which, in the case of using only liquid fuel, is made symmetrical. The pressure chamber 42 of the needle 40 of the pre-injection nozzle 6 is connected by channel 51 to the fuel line 34 and respectively to the receiving cavity 17 through a check valve 35. The needle pressure chamber 43 41 of the main injection nozzle is connected by channel 52 to the fuel line 29 and, accordingly, to the engine cavity 1 In the case of using gaseous fuel (Figo 2) the main injection nozzle 7 has an additional chamber 53 d The gaseous fuel connection provided by the channel 54 and the fuel line 55 to a high pressure gas source (e.g., 250 bar, not shown) "Pressure chamber 43 is located so that it can communicate with the drain when the needle 41 is raised through the connecting channels 56 and 57, and the traverse can be performed optionally symmetrical and, in addition, the fuel injection pipe 2 is connected to the fuel pipe 29 by means of an additional channel 58 c.



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    a check valve 59 which allows the pressure chamber 4j to be emptied, i.e. lock needle 41 on main injection.
    The injection device and the metering pump operate as follows.
    Under the influence of a constant pressure acting in the fuel line 4, if necessary under the influence of the force of the spring 26 and in the absence of pressure being forced by the pump
    I high pressure through the fuel line 2, the transmitting piston 11 at the beginning of the cycle is pressed against the stop 12. The stop
    12 is positioned in such a way that the transfer piston 11 closes the opening 28, and the stop is positioned so that this opening 28 could open during the movement of the piston 11. When the high-pressure pump 1 pumps the fuel into the fuel line 2, the pressure in the engine cavity 16, pushes the piston
    II in the drilling 10 and causes an injection with identical pressure of the fuel of the preliminary injection from the receiving cavity 17 into the fuel line 34. This injection takes place before the piston 11 meets the inner end
    15 stops 13. Consequently, the volume supplied during pre-injection depends on the distance D1, initially set between the end of the piston 11 and the stop 13. In addition, the piston 11 passes the distance D2 separating the other end of the piston 11 and the orifice 28. Because the opening 28 is blocked by the piston 11, the pressure in the fuel line 29 and the channel 52 is absent. But as soon as the end of the piston 11 opens the opening 28, the main fuel is injected into the fuel line 29 together with the preliminary injection, which continues, the chuck as the piston 11 has not yet reached the stop 13. The main injection continues until the pump 1 is interrupted.
    Thus, the selection of the distances D1 and D2 allows the variation of the ratio of the preliminary and main injection, as well as the overlap value of these two injection phases.
    If the distances D1 and D2 are equal to zero (Fig. 3), then the preliminary injection is equal to zero, and the main injection occurs immediately.
    1554775
    If the distance D2 is zero, and the distance W is not zero (Fig. 4), then there is a simultaneous start of the preliminary and main | Injection phases, and the duration of the preliminary injection depends on the value of the distance D1, i.e. from the position of the stop 13. Between these extreme positions, a suitable choice of the distances D1 and D2 regulates the value of the volume of the preliminary injection and the start of the main injection.
    If the distance D2 corresponds to the displacement volume of the piston 11 exceeding the cylinder volume of pump 1 (the case of small loads), the main injection phase is eliminated and only the preliminary injection phase is performed.
    If the device operates on gaseous fuel for the main injection (Fig. 2), then the raising of the needle 41 of the main injection nozzle 7 is also controlled by the flow of fluid into the pressure chamber 43. To ensure proper spraying, the holes 47 should create a sufficient pressure in the gaseous fuel source (for example, 250 bar). But in the case when this source is absent, the raising of the needle 41 of the main injection becomes useless and should be neutralized. Then the stop 13 is adjusted so that the piston 11 permanently closes the opening 28, and the additional opening 36 of the receiving cavity 17 is positioned in such a way as to the stop 13, so that it never overlaps the piston 11.
    The stop 12 is adjusted so that the additional opening 30 of the motor cavity 16 is constantly open. This adjustment of the two stops provides communication between the motor and the receiving cavities. The preliminary and main injection are replaced in this case by a single injection, which is carried out with the help of a needle 40 and holes 46.
    Various cases of operation depend on engine load conditions, and the position of the cams 22, 23 can be controlled by engine operation parameters such as speed, torque, intake air pressure, coolant temperature, fuel combustion conditions, etc.
    five
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    eight
    The metering pump 8 can be either separate or combined structurally in one monoblock complex with a high-pressure pump 1, and the nozzle block 5 can be made in the form of two separate nozzles.
    权利要求:
    Claims (4)
    [1]
    1. An injection device for a dual-fuel internal combustion engine comprising a low-pressure pump for pre-injection of liquid fuel, a high-pressure pump of a plunger type for the main injection of liquid or gaseous fuel, two fuel nozzles for preliminary and main injection, each with a needle with pressure chamber metering pump, in the case of which the transmitting piston is installed with the formation of a motor in it, on the one hand, and a receiving cavity on the other hand
    and with the possibility of reciprocating movement between separately adjustable stops, a drain line and fuel lines, which selectively connect low and high pressure fuel pumps with pressure chambers of needles of preliminary and main injection nozzles through the engine and receiving cavities of the dosing pump, characterized in that extending the limits of adjusting the fuel injection phases, it is equipped with an additional fuel line, and with the extreme position of the engine cavity stop, additional fuel rovod connects the motor and a receiving cavity, and the fuel, binding motor cavity with a nozzle needle pressure chamber of the main injection, is blocked by the transmitting piston.
    [2]
    2. A device according to claim 1, characterized in that the needle of the main injection nozzle is provided with connecting channels arranged to communicate its pressure chamber with a drain when the needle is in a raised position
    [3]
    3 „Device according to nn. 1 and 2, characterized in that the fuel line connecting the motor cavity of the metering pump to the injector chamber of the main injection is additionally connected to the fuel pump
    high pressure catfish through reverse
    valve.
    I i
    [4]
    4. Dosing pump device
    an injection for a dual-fuel internal combustion engine, one of which is liquid for pre-injection and the other liquid or gaseous for the main injection, containing an axially drilled housing, located in axial drilling with the ability to move between two stops, a spring-loaded transfer piston, one the end of which limits the motor cavity, which is provided with openings for connecting the latter with a high-pressure fuel pump and pressure chamber 10
    The main injection nozzle and the other end limits the receiving cavity, which is provided with openings for connecting it to a low pressure pump and a pressure chamber of the preliminary injection nozzle, and a separate mechanism for adjusting the position of the lugs, in order to fuel injection, in the housing in the area of the engine and receiving cavities, there is additionally one hole in each, interconnected by the fuel line, adjustable stops are located in the engine and receiving lanes x slidably in the past for adjusting the stroke of the transmitting piston.
    19 23
    FIG. 2
    12
    AT
    „„ {,
     / / s /
    Fig.Z
    2b
    5
    t 4 11 n / 3
    „L„ „1,„,
     Ms S / S JfS SSS.
    23
    类似技术:
    公开号 | 公开日 | 专利标题
    SU1554775A3|1990-03-30|Injection system for two-fuel ic-engine, and metering pump therefor
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    USRE33270E|1990-07-24|Pressure-controlled fuel injection for internal combustion engines
    US4628881A|1986-12-16|Pressure-controlled fuel injection for internal combustion engines
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    JP2645577B2|1997-08-25|Electronic unit injector
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    US4200067A|1980-04-29|Hydraulic valve actuator and fuel injection system
    US4129254A|1978-12-12|Electromagnetic unit fuel injector
    US4984738A|1991-01-15|Unit injector for staged injection
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    US4879984A|1989-11-14|Fuel injection pump for internal combustion engines
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    US4064845A|1977-12-27|Metering valve for pilot fuel injection
    US5531382A|1996-07-02|Valve arrangement
    EP0537911A1|1993-04-21|Fuel pump
    同族专利:
    公开号 | 公开日
    YU47701B|1996-01-08|
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    US4700672A|1987-10-20|
    FI871127A|1987-09-15|
    DK128887D0|1987-03-13|
    CZ283354B6|1998-03-18|
    FI871127A0|1987-03-13|
    NO871022L|1987-09-15|
    AT57744T|1990-11-15|
    YU41687A|1990-12-31|
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    JP2578423B2|1997-02-05|
    DK162947B|1991-12-30|
    EP0237071A1|1987-09-16|
    NO168601B|1991-12-02|
    FI89971B|1993-08-31|
    SK279068B6|1998-06-03|
    IN170078B|1992-02-08|
    EP0237071B1|1990-10-24|
    ES2018184B3|1991-04-01|
    CZ176887A3|1993-11-17|
    DE3765661D1|1990-11-29|
    FR2595761B1|1988-05-13|
    FI89971C|1993-12-10|
    FR2595761A1|1987-09-18|
    DK128887A|1987-09-15|
    SK176887A3|1998-06-03|
    引用文献:
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    US5140959A|1991-01-28|1992-08-25|Durbin Enoch J|Method and apparatus for operation of a dual fuel compression ignition combustion engine|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FR8603691A|FR2595761B1|1986-03-14|1986-03-14|INJECTION DEVICE FOR AN INTERNAL COMBUSTION ENGINE, ALLOWING THE INJECTION OF TWO FUELS|
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