• 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:
    Flushing valve for common rail heavy fuel injection systems for internal combustion engines comprising a valve body (19), in the valve body (19) between an open and a closed position movable valve member (22) which cooperates in the closed position with a valve seat (21) and a high pressure area a high-pressure side inlet (26), which is connectable to a heavy oil high-pressure accumulator (rail) (8), at least one low-pressure side outlet (29), which is connectable to a return line (18), and actuating means for actuating the Valve member (22), wherein the valve member (22) opens inwardly toward the high pressure side.
    公开号:AT511252A1
    申请号:T507/2011
    申请日:2011-04-08
    公开日:2012-10-15
    发明作者:
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    08/04 20Π 12:49 FAX * 4315339250 HAFFNER & KESCHMANN, 0.0,04 / 021 1
    The invention relates to a flush valve for common-Raii heavy fuel injection systems for internal combustion engines comprising a valve body, a valve body in between a üffnungs- and a closed position movable valve member which cooperates in the Schließsteliung with a valve seat and a high pressure region of a low pressure region separates, a high pressure side inlet fuel rail which is connectable to a heavy oil high-pressure accumulator (rail), at least one low-pressure side drain connectable to a recirculation line, and actuating means for actuating the valve member.
    The invention further relates to a
    Fuel supply system for common rail heavy fuel injection systems for internal combustion engines with such a purge valve.
    From Kestengründen low-grade fuels such as heavy oil are used in very large diesel engines, especially in marine diesel engines.
    Due to the special physical properties of heavy oils special precautions have to be taken for the operation with heavy oil. For example, the viscosity of heavy fuel oil is much higher than normal diesel fuel, so heating to more than 80eC is required to pump the heavy oil at all.
    The high viscosity of heavy fuel oil means that fuel must always be circulated in the piping system during engine standstill in order to prevent the formation of heavy oil in the pipes. 08/04/2011 12:59
    No .: R472 P 004/021 08/04 2011 12 49 FAX * 4315333250 HAFFMER & KESCHMANN Jä.0.05 / 021 • · 2
    For this purpose, a purge valve is provided in Coirmon-Rail Schweröl-Einspritisystemen of the aforementioned type / which is closed during operation of the engine and thereby the high-pressure side parts of the fuel system and thus the rail against a low-pressure side fuel return line through which fuel into the tank can be returned, closes. At standstill of the engine, this purge valve can now be opened, so that fuel from the high pressure side through the high pressure lines and the rail through the valve to the low pressure side and in the sequence in the tank is circulated, the fuel held by a preheater at a corresponding temperature so that solidification of the heavy oil in the pipes is prevented.
    In addition to the possibility of generating a circulation flow for temperature control of the fuel in the system, the purge valve also has the function of an emergency stop valve. The valve is intended to prevent inadmissibly high pressures in the rail from leading to dangerous conditions. By suitable control of the purge valve, in an emergency, i. e.g. when exceeding a predetermined pressure level, the system pressure can be lowered very quickly, without the injection injectors themselves must be disabled.
    As possible valve types for the purge valve currently slide valves or spring-loaded seat valves are used. Slide valves (see for example WO 2010/040163 A2)
    have the disadvantage that in this aü _ and the concept Uber the valve guide constantly Hockdruc.k is applied. This leads to constant leaks, which on the one hand the 08/04/2011 12:59
    No .: R472 P.005 / 021 08/04 2011 12:50 FAX * 4315335250 HAFFNER & KESCHMANN .BLQoe / 021 • * · «* · * • ♦ · ·« I ·· C · • < * * I ft * * 3
    Reduce the efficiency of the system and continue to constantly flush particles from the fuel into the valve guide, which can lead to a risk of valve terminals. Spring-loaded seat valves of the outer-opening type have the disadvantage that very high spring forces are required in order to seal off the valve during engine operation against the high system pressure (up to 2200 bar). This means a very large space and further very high actuation forces to keep the valve open in the open state 2U.
    The present invention therefore aims to improve the purge valve so that the leakage quantities and the risk of clotting are reduced. Furthermore, a reliable seal should be ensured even at very high system pressure, for example, 2200 bar or more. Furthermore, it is desirable to reduce the actuating forces for opening and keeping the purge valve open. To solve this problem, the invention provides for a purge valve of the type mentioned that the valve member opens to the inside, the high pressure side. In contrast to spring-loaded poppet valves of the external opener type, poppet valves of the internal-opening type have the advantage that the rail pressure to be sealed increases the sealing effect of the purging valve. The higher the pressure to be sealed, the higher the sealing forces, so that a reliable seal is ensured even at almost any high system pressures. Furthermore, the seat valve of the internal opening design is leak-free, so that no additional losses occur and further the risk of jamming is minimized. 08/04/2011 13:00
    N °: R472 P.006 / 021 08/04 2011 12 50 FAX +4315338250 HAFFNER & KESCHMANN 1.0.07 / 02 1 f * * * 4
    If, as corresponds to a preferred development, the high-pressure side feed axially leads to the valve member, beyond the high-pressure area intersections are avoided, which would affect the fatigue strength of the valve.
    To actuate the valve member, the valve member erfir.dungsgemäß inward, that is to be opened to the high pressure side, so that the irr. High-pressure accumulator (rail) prevailing pressure must be overcome. The required axial loading of the valve member is carried out according to a preferred development in that the actuating means arranged on the low pressure side, axially displaceable control piston, which cooperates with the valve member. The admission takes place from the low pressure side, so that a simple structural design can be selected and also the size can be minimized. A preferred embodiment provides that the actuating means comprise a Druckiuftquelle which is connectable to a pressure-tight space of the valve body, in which the control piston or a part connected to the control piston member is axially displaceable under compressed air. The actuation of the valve member thus takes place with the aid of a pressure medium, in particular with compressed air. As long as the compressed air on the control piston or one connected to the control piston. Part is present, the valve member is held in the open state. When the valve is to be closed again, the compressed air is reduced again and the provision of the control piston or the part connected to the control piston is then advantageously characterized in that the control piston or a part connected to the Steuerkolb'en in the axial direction of a 08 / 04/2011 13:00
    No .: R472 P.007 / 021
    08/04 2011 12 50 FAX +4315339250 HAFFNER & KESCHMANN 5 return means, in particular a return spring, in the closing direction of the valve member is acted upon.
    To return the valve member may preferably be provided separate return means and the training is in this case preferably further developed such that the high-pressure side, the valve member in the direction of the valve seat acting Rückstellir.ittel, in particular a return spring, is arranged. During the high-pressure side inlet, as already mentioned, takes place in the axial direction, an axial guiding of the low-pressure side sequence due to the arrangement of the control piston is not readily possible or desirable. A constructive particularly advantageous development provides in this context, that the at least one niederöruckseitige flow of a low pressure side Ventilraurr. transversely away, which is penetrated by an axial portion of the control piston to form a Rincraums.
    Due to the use of heavy fuel oil is due to its abrasive effect wear of the valve member, at least in the region of the valve seat, and wear of the valve seat frequently observe 2U. Advantageously, therefore, structural measures should be taken to replace the parts affected by wear in a simple manner. This is most easily achieved according to a preferred embodiment of the present invention in that the valve seat is provided on a separate sleeve from the valve body. Due to the design of the valve seat on a separate component this can easily 08/04/2011 13:01
    No .: R472 P.008 / 021 06/04 2011 12:51 FAX +4315339250 HAFFNER & KESCHMANN yes.0.09 / 021 • * 6 are removed and replaced. In order at the same time to achieve easy removability and secure attachment of said sleeve, it is further preferably provided that the sleeve is disposed in an axial bore of the valve body and pressed axially by means of a screwed into the bore holding member against a stop formed by a reduction in diameter of the bore becomes.
    The valve member is preferably formed conical in the region of the seat and cooperates with a conical valve seat to achieve an optimum sealing effect.
    According to a further aspect of the invention, a Kraftstoffverscrgungsanlage for common rail heavy fuel injection systems for internal combustion engines is provided with a tank, a prefeed pump for conveying heavy oil from the tank to a high pressure pump, the high pressure pump is connected via at least one high-pressure line with a high-pressure accumulator (rail), the feeds at least one injection injector, and further with a flush valve according to the invention, the high-pressure side inlet is connected to the high-pressure accumulator to at least a partial amount of heavy oil on the low-pressure side drain of the purge valve and a Rueckführungsleitung preferably in the tank ab2uateuern. In order to create a flushing circuit in a simple manner, the flushing valve is preferably connected via one of the high-pressure pump coming from the high-pressure pump and by the injectors feeding lines separate connection to the high-pressure accumulator (Rail). The flush valve can be 08/04/2011 13:01
    No.: R472 P.009 / 021 08/04 2011 12:51 FAX +4315339250 HAFFNER 8 KESCHMANN $ .0.10 / 0 21 · ** «» · · · · · * «·· * t nt f« * * · «* * · ** ··« «# * * 7 be screwed directly into the housing of the high pressure accumulator or otherwise attached to this or be connected via a separate high pressure line to the high pressure accumulator.
    In order to avoid cooling of the fuel pumped in the circuit when the engine is switched off, it is preferably provided that a heat exchanger for preheating the heavy oil is arranged between the tank and the prefeed pump. The heat exchanger can alternatively be used for cooling the heavy oil with the engine running.
    To control the flush valves, an electrical control device is advantageously provided, which opens or closes the flush valve depending on the operating state. The training is here preferably further developed such that a control device is provided which cooperates with the purge valve to open the valve when the internal combustion engine, whereby the rinsing function of Spülventiis is realized. To realize the Notatoppfunktion of the valve is preferably provided that a pressure sensor for detecting de® internal pressure of the high pressure accumulator (Rails) is provided which cooperates with a control device such that the purge valve opens when a predetermined limit pressure is exceeded.
    The invention will be explained in more detail with reference to an embodiment schematically illustrated in the drawing. 1 shows a common-rail heavy-fuel injection system in which the flush valve according to the invention can be used, and FIG. 2 shows an inventive flush valve in section. 08/04/2011 13:01
    No .: R472 P, 010/021 08/04 201 1 12:52 FAX * 4315339250 HAFFNER & KESCHMANM Jäi), 11/021 • * * «« · «* * · # *« · · · · · · · · * 8
    In Fig. 1, a common rail heavy oil Eirspritzgystem is shown schematically. From the tank 1 is supplied by a Vorfürderpumpe 3 fuel, which was heated in the preheater 2, via a fuel filler 4 and fuel lines 5 at least one high-pressure pump 6, where the fuel is compressed to system pressures of higher than 1400 bar, in particular up to 2200 bar. The compressed fuel passes through high pressure lines 7 in at least one rail 8, which is equipped inter alia with at least one Druckbegrenzungsver.til 9 and a rail pressure sensor IC. The pressure in the rail 8 is set by controlling the amount of fuel delivered by the high-pressure pump 6 into the high-pressure line 7 by the control unit 11. Starting from the rail 8, the fuel passes via a flow restrictor 12 via the high-pressure line 13 into the Eir.spritzinjektor 14, which is also controlled by the control unit II. The required for the function of Sinspritzinjektcrs 14 fuel control amount passes through the N'iederdruckieitungen 15 back into the tank 1. In order to ensure circulation of the fuel in the piping system during standstill of the engine leads from the rail 8, starting a further high pressure line 16 to a SpUlventil 17, which controlled by the control unit 11 can divert a portion of the fuel directly into low pressure lines 18, which lead directly back to the tank 1.
    The functions of the purge valve 17 and the pressure relief valve 9 can be combined in the purge valve 17 when the purge valve 17 has a pressure limiting function. The separate pressure relief valve 9 can thus be omitted in this alternative embodiment. 08/04/2011 13:02
    No.: R472 P.011 / 021 08/04 2011 1252 FAX +4315339250 HAFFNER Ü keschmann ............, 0A12 / 021 • * · · «*« · * · «* # * «» «* * * * ·« · 9
    2 shows a section through the flushing valve 17. The flushing valve 17 comprises a valve body 19 and a valve sleeve 20, which has a valve seat 21, with which a seating surface of the valve member 22 cooperates. The valve sleeve 20 is received in a bore 23 of the valve body 19 and is pressed by means of a screw 24 against a stop surface 25. The Verschraubungsteil 24 has an inlet 26 for coming from the high-pressure accumulator high-pressure fuel. The valve spring, which acts on the valve member 22 in the direction of the valve seat 21, is denoted by 27.
    Low pressure side, the purge valve has a. Valve space 2Θ, away from the two drain holes 29 transversely. The valve chamber 28 is formed in a bore 30 in which a control piston 31 is guided axially displaceable. In the. Valve chamber 28 passing through the control piston 31 is formed here with a reduced diameter, so that an annular space remains. The control piston. 31 cooperates with the end face of the valve member 22 and can thus actuate the valve member 22 in the axial direction. For sealing the control piston 31 within the bore 30, a seal 36, a washer 37 and a locking ring 39 are provided. For the axial displacement of the control piston 31, a further piston 32 is provided, in which a head portion 33 of the stuffer piston 31 is received positively. The further piston 32 is acted upon by means of a compression spring 40 in the direction of the lid, not shown, of the flushing valve. The valve body 19 has a compressed air connection 34 which communicates with the valve body 19, 08/04/2011 13:02
    No .: R472 P.012 / 021 08/04 2011 12:52 FAX +4315339250
    HAFFNER & KESCHMANN .............. J1A13 / 021 • ♦ • 4 * * * * * ♦ * t I »» · * ·· «* *» · «m« 10 the valve cover, not shown and the cup-shaped further piston 32 is in communication,
    The operation of the purge valve according to the invention is as follows. In the operating state of the engine, the system pressure (up to 2200 bar) is applied to the valve via the inlet 26. At the valve seat 21, the system pressure is sealed against the low pressure area, If now the pressure in the high pressure area must be reduced, which is required, for example, an emergency stop, the normal engine stop with subsequent flushing of the high pressure system or in the case of maintenance, the piston 32 of Pressed down with compressed air via the compressed air connection 34. Above the stroke A, the control piston 31 lifts the valve member 22 to the right. Reaching the stroke stop while overcoming the valve element lift B on. During the stroke, the air between the valve body 19 and dam piston 32 is displaced over the holes 39. The valve member 22 is completely lifted out of the valve seat 21 so that the corresponding cross-section is available for the flushing process and the flushing quantity can be removed via the outlet 29. When the engine is to be started again, the compressed air is released again, whereupon the piston 32 is brought back into the starting position due to the action of the spring 40 and the valve member 22 due to the action of the spring 27 and the valve is closed.
    The assembly of the purge valve according to the invention is carried out as follows. First, the sleeve 20, the valve member 22 and the spring 27 are inserted into the bore 23 and the screw 24 is screwed with a corresponding torque in the valve body 19, in the sequence, the seal 36, the disc 37, the locking ring 38 and the 08 / 04/2011 13:02
    No .: R472 P.013 / 021
    08/04 2011 1253 FAX +4315333250 HAFFNER & Keschmann
    4) .14 / 021 11
    Compression spring 33 inserted or inserted into the valve body 19. Finally, the control piston 31 can be inserted into the piston 32 and inserted together in the valve body 19. 08/04/2011 13:03
    No .: R472 P.014 / 021
    权利要求:
    Claims (13)
    [1]
    08/04 2011 1253 FAX +4315339250 HAFFNER & KESCHMANN .0415 / 021

    1. Flushing valve for common rail heavy fuel injection systems for internal combustion engines comprising a valve body {1 $), a in the valve body (19) between an open and a closed position movable valve member (22) in the closed position with a valve seat (21) and a high-pressure area separated from a low-pressure area, - a high-pressure side inlet (26) which is connectable to a heavy oil high-pressure accumulator (rail) (8), at least one low-pressure side outlet (29) connected to a return line ( 18) is connectable, and actuating means for actuating the valve member (22), characterized in that the valve member (22) opens inwardly toward the high pressure side.
    [2]
    2. Flushing valve according to claim 1, characterized in that the Setätigungsmittel arranged on the low pressure side, axially displaceable control piston (31), which cooperates with the valve member (22).
    [3]
    3. Flushing valve according to claim 1 or 2, characterized in that the actuating means comprise a compressed air source which is connectable to a pressure-tight space (35) of the valve body (19), in which the control piston (31) or one with the control piston (31). connected part (32) is axially displaceable under compressed air.
    [4]
    4. Flushing valve according to claim 1, 2 or 3, characterized in that the control piston (31) or with the 08/04/2011 13:03 No .: R472 P.015 / 021 HAFFNER & KESCHMANN 08/04 2011 12:53 FAX +4315339250 • .............. £) 416/021 · * «· · · · · * *« * · · * # · · * A control piston (31) connected part (32) in the axial direction of a return means, in particular a return spring (40) is acted upon in Schiiefirichtung the valve member.
    [5]
    5. Flushing valve according to one of claims 1 to 4, characterized in that the high-pressure side, the valve member (22) in the direction of the valve seat (21) acted upon return means, in particular a return spring (27), ar.ordinate.
    [6]
    6. Flushing valve according to one of claims 1 to 5, characterized in that the at least one low-pressure side outlet (29) wegfuhrt transversely from a low-pressure side valve chamber (29), which is penetrated by an axial portion of the control piston (31) to form an annular space.
    [7]
    7. Recoiling valve according to one of claims 1 to 6, characterized in that the valve seat (21) on one of the valve body (19) separate sleeve (20) is provided.
    [8]
    8. Flushing valve according to claim 7, characterized in that the sleeve (20) in an axial bore (23) of the valve body (19) is arranged and by means of a screwed into the bore (23) retaining element (24) axially against a by a diameter reduction the stopper (23) formed stop surface (25) is pressed.
    [9]
    9. fuel supply system for commor.-rail heavy fuel injection systems for internal combustion engines with a tank (1), a prefeed pump (3) for conveying heavy oil from the tank (1) to a high pressure lamp (6), the 08/04/2011 13: 03 No .: R472 P.016 / 021 08/04 2011 12 54 FAX +4315333250 HAFFNER & KESCHMANH 117/021 14 high pressure pump (6) via at least one high-pressure line [7] with a high-pressure accumulator (rail) (8) is connected, the at least one. Injection injector (14) feeds, and further with a flush valve (17) according to one of claims 1 to 8, whose high-pressure side inlet (26) with the. High-pressure accumulator (8) is in communication to abzusteuern at least a subset of the heavy oil on the low-pressure side flow (29) of the purge valve (17) and a return line (18) preferably in the tank (l).
    [10]
    10. Fuel supply system according to claim 9, characterized in that the flushing valve (17) via one of the high pressure pump (6) coming high-pressure line (7) and of the injectors (14) feeding lines (13) separately, connection (16) to the high-pressure accumulator (rail) (8) is connected.
    [11]
    11. Kraftstoffversorgungsar.lage according to claim 9 or IC, characterized in that between the tank (1) and feed pump (3) a preheater (2) for. Preheating the heavy oil angeordr.et is,
    [12]
    12. Fuel supply system according to claim 9, 10 or 11, characterized in that a control device (11) is provided, which cooperates with the flush valve (17) for opening the valve when the internal combustion engine.
    [13]
    13. Power plant according to one of claims 9 to 12, characterized in that a pressure sensor (10) for detecting the internal pressure of the high-pressure accumulator (Rails) (B) is provided, which is connected to a control device 08/04/2011 13:04 Mr. R472 P.017 / 021 0.016 / 021 08/04 20 1 1 12 54 FAX +4315339250 HAFF NER & KESCHMANN ......................................................................................................................................................................................... ; * * * 15 (11) cooperates such that the purge valve (17) opens when exceeding a predetermined limit pressure. Vienna, 6 April 2011 Applicant by: Haffner and Keschmann Patentanwälte OG 08/04/2011 13:04

    No .: R472 P.018 / 021
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    同族专利:
    公开号 | 公开日
    AT511252B1|2013-10-15|
    JP5783662B2|2015-09-24|
    CN103459826A|2013-12-18|
    EP2694796B1|2015-09-30|
    JP2014510232A|2014-04-24|
    KR101935240B1|2019-01-04|
    KR20140022011A|2014-02-21|
    WO2012135885A1|2012-10-11|
    EP2694796A1|2014-02-12|
    CN103459826B|2016-08-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP1314883A2|2001-11-21|2003-05-28|MAN B & W Diesel AG|Common rail fuel supply system of an internal combustion engine with multiple cylinders|
    WO2010040163A2|2008-10-10|2010-04-15|Robert Bosch Gmbh|Fuel supply system for heavy oil common rail injection systems|DE102013014152A1|2013-08-23|2015-02-26|L'orange Gmbh|Rinse-start procedure for an internal combustion engine and rinsing start system|DE10047805B4|2000-09-25|2005-04-21|L'orange Gmbh|valve assembly|
    JP2004019469A|2002-06-12|2004-01-22|Mitsubishi Heavy Ind Ltd|Fuel injector and diesel engine equipped with the same|
    DE10355124B4|2003-11-24|2005-09-22|L'orange Gmbh|Pressure relief valve for fuel injectors|
    JP4495667B2|2005-11-01|2010-07-07|ヤンマー株式会社|Fuel injection device|
    JP4544153B2|2005-12-27|2010-09-15|株式会社デンソー|Fuel injection control device|WO2017032917A1|2015-08-26|2017-03-02|Wärtsilä Finland Oy|Safety valve arrangement|
    DE102017208400A1|2017-05-18|2018-11-22|Robert Bosch Gmbh|Device and method for injecting fuel into a combustion chamber of an internal combustion engine|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA507/2011A|AT511252B1|2011-04-08|2011-04-08|FLUSH VALVE FOR COMMON-RAIL HEAVY-OIL INJECTION SYSTEMS|ATA507/2011A| AT511252B1|2011-04-08|2011-04-08|FLUSH VALVE FOR COMMON-RAIL HEAVY-OIL INJECTION SYSTEMS|
    EP12715310.4A| EP2694796B1|2011-04-08|2012-04-05|Pressure relief valve for common rail heavy oil injection systems|
    PCT/AT2012/000096| WO2012135885A1|2011-04-08|2012-04-05|Flushing valve for common rail heavy oil injection systems|
    CN201280016463.6A| CN103459826B|2011-04-08|2012-04-05|Flushing valve for common rail heavy oil spraying system|
    JP2014502952A| JP5783662B2|2011-04-08|2012-04-05|Flushing valve for common rail heavy oil injection system|
    KR1020137026380A| KR101935240B1|2011-04-08|2012-04-05|Flushing valve for common rail heavy oil injection systems|
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