• 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:
    In a valve with a pressure limiting function for common rail heavy fuel injection systems for internal combustion engines comprising a valve carrier (18), a valve carrier (18) displaceably mounted in the valve piston (21) which cooperates with a valve seat (22) when the valve is closed, and a Valve piston (21) acting on a pressure acting in the closing force compression spring (24), wherein the valve piston (21) acting in the closing direction bolt (30) by means of an actuating means against the pressure force of the compression spring (24) for controlled opening of the valve to form a Flushing function is slidably disposed, the actuating means in a cylinder (25) slidably mounted actuating piston (26) engageable with a stop surface of the bolt (30) for displacing the bolt (30) against the pressing force of the compression spring (24) is.
    公开号:AT510464A1
    申请号:T1612/2010
    申请日:2010-09-27
    公开日:2012-04-15
    发明作者:
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    1
    The invention relates to a valve with a pressure limiting function for common rail heavy fuel injection systems for internal combustion engines comprising a valve carrier, a valve carrier displaceably mounted in the valve piston, which cooperates with a valve seat when the valve is closed, and a valve piston acting with a force acting in the closing force pressure spring.
    The invention further relates to a fuel supply system for common rail heavy fuel injection systems for internal combustion engines with a tank, a prefeed pump for conveying heavy oil from the tank to a high pressure pump, wherein the high pressure pump is connected via at least one high pressure line to a high pressure accumulator (rail), the feeds at least one injection injector, and further with a valve which is connected via its own high-pressure line to the high pressure accumulator to abzusteuern at least a subset of the heavy oil as needed via a return line into the tank.
    A pressure relief valve of the type mentioned is used to limit the pressure in the high-pressure accumulator (rail) while providing an emergency driving property. The pressure relief valve is usually screwed to the rail and communicates with a spring-loaded valve pin via a sealing seat with the highly compressed fuel in contact. On the back of the sealing seat, the valve is connected via a line with the low pressure return of the common rail system. If the rail pressure moves within the permissible range, the valve remains closed by the applied spring force and is sealed against the return line. If the maximum permissible rail pressure is exceeded in the event of a fault, the valve opens and limits the system pressure. A pressure relief valve is for example
    REPLACED 2 temdruck. A pressure limiting valve is described, for example, in WO 2004/083695 A1.
    For cost reasons, low-quality 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 must be taken for operation. For example, the viscosity of heavy fuel oil is much higher than normal diesel fuel, so heating to more than 80 ° C 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.
    For this purpose, a purge valve is provided in common-rail heavy fuel injection systems, 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 is returned to the tank can, 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.
    SUBSEQUENT
    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. By suitable control of the purge valve, the system pressure can be lowered very quickly in an emergency, without the injection injectors themselves must be disabled.
    In conventional common rail systems, the pressure relief valve and the purge valve are formed as separate units and therefore connected to each other at different locations on the rail. This requires a high structural and manufacturing expense. The present invention therefore aims to avoid the mentioned disadvantages without the life or the reliability of the valves are impaired.
    To solve this problem, the valve of the type mentioned is inventively further developed such that a valve piston in the direction acting on the bolt by means of an actuating means against the pressure force of the compression spring for controlled opening of the valve to form a rinsing function is slidably disposed. The valve thus represents a combination of the pressure relief valve with the purge valve, both valves operate independently using the same valve seat. The compression spring of the valve preferably acts simultaneously as the opening pressure of the pressure limiting function of the valve-determining compression spring and as a compression spring for the Spülventilfunktion. In particular, the compression spring acts on the valve piston with the interposition of the bolt in the closing direction. Due to the fact that the pressure spring does not become directly on the valve piston of the valve, but with intermediate switching
    After the mentioned bolt, in addition to the pressure limiting function, the rinsing function is enabled, said actuating means serving to apply a force acting against the compression spring, which leads to a lifting of the bolt and, accordingly, to a release of the valve piston, so that the valve piston due lift the high-pressure-side pressure from the valve seat and release the required flow area for the purge function. As long as the actuator is not activated, the pressure limiting function of the valve, however, is completely unimpaired. Thus, for example, it is also possible in a conventional manner to adjust the opening pressure of the pressure relief valve, for which purpose the design is preferably made such that the pressure spring is held on the side facing away from the bolt with the interposition of a shim.
    The actuating means for actuating the bolt in the opening direction, i. against the force of the compression spring, can basically be performed arbitrarily, as long as the required operating force is ensured. The actuating force, which can be applied, for example, hydraulically, magnetically or pneumatically, could basically be brought into effect directly on the bolt. In order to ensure a sufficient operating force, a corresponding attack surface is usually required, with which a corresponding mass of the bolt is connected. At the same time, however, it is endeavored to keep the mass of the bolt as low as possible in order to minimize the inertia of the valve for optimum operation of the pressure limiting function. A preferred embodiment, which takes into account the two conflicting requirements, namely to ensure a sufficient operating force
    5 and minimizing the inertia of the system, it provides that the actuating means comprises a displaceably mounted in a cylinder actuating piston which is engageable with a stop surface of the bolt for displacing the bolt against the pressing force of the compression spring in operative connection. The force for the actuation of the bolt against the compression spring thus does not come directly to the bolt to the effect, but on a separate actuating piston, which entrains the pressure pin in the opening direction. Conversely, however, a movement of the bolt does not take the actuating piston.
    To prevent the actuating piston obstructing the bolt in the closing direction in such a way that possibly the force of the compression spring does not fully affect the valve piston to effect, provides a further preferred embodiment that between the abutment surface of the bolt and the corresponding counter surface of the piston in the closed state of the valve, an axial gap is provided.
    Advantageously, the actuating piston is cup-shaped and has on its inner circumference guide surfaces for axially guiding the bolt.
    The actuation of the actuating piston can basically be arbitrary, as already mentioned. A particularly reliable and proven operation is preferably carried out in that the actuating means comprises a pneumatic means to pressurize the actuating piston in the opening direction with pressure. In this case, it may be provided, in particular, that a line, which can be charged with pressure medium, in particular compressed air, into a line which is limited by the actuating piston
    POSITIVE IT 6 of the pressure spring facing away from the actuating piston arranged space opens.
    In order to ensure a return of the actuating piston after the displacement required for the opening of the flushing cross section, it is preferably provided that a further, the actuating piston in the closing direction of the valve directly acting on compression spring is provided. A particularly space-saving design is preferably achieved in that the actuating piston acting on the other compression spring and the valve piston acting on compression spring are arranged coaxially. In particular, the compression springs can be arranged so that the actuating piston acting on the other compression spring surrounds the pressure acting on the valve piston compression spring.
    A compact and modular construction advantageously results from the fact that a high-pressure bore leading to the valve seat and at least one outflow channel are formed in the valve carrier. In particular, the valve carrier is detachably connected to the component having the actuating means, in particular screwed.
    The invention will be explained in more detail with reference to an embodiment schematically illustrated in the drawing. 1 shows a fuel supply system and FIG. 2 shows a cross section through a valve according to the invention.
    In Fig. 1, a common rail heavy fuel injection system is shown schematically. From the tank 1 is from a prefeed pump 3 fuel, which was heated in the preheater 2, via a fuel filter 4 and fuel lines 11 at least
    READY 7 a high-pressure pump 5 is supplied, where the fuel is compressed to system pressures of higher than 1400 bar. The compressed fuel passes through high pressure lines 12 in at least one rail 6, which is equipped, inter alia, with at least one pressure relief and purge valve 13 and a rail pressure sensor 7. The pressure in the rail 6 is set by the control unit 10 by regulating the amount of fuel delivered by the high-pressure pump 5 into the high-pressure line 12. Starting from the rail 6, the fuel passes via a flow restrictor 9 via the high-pressure line 14 into the injection injector 8, which is likewise controlled by the control unit 10. The required for the function of the injection injector 8 fuel control amount passes through the low pressure lines 15 back into the tank 1. In order to ensure a circulation of the fuel in the piping system even during the stoppage of the engine, leads from the pressure relief and purge valve 13, a low pressure line to the tank 1, so that a subset of the fuel can be controlled directly back into the tank 1 via the low-pressure line 15.
    2, the pressure limiting and flushing valve 13 according to the invention is shown in detail. The valve 13 has a fastening thread 17, by means of which it can be screwed into the rail 6, the valve carrier 18 having a sealing cone 20 for connecting the high-pressure feed line 19 to the rail 6. The valve piston of the valve 13 is denoted by 21 and can be pressed against the valve seat 22 by means of a compression spring 24. When a predetermined pressure in the rail 6 is exceeded, the valve piston 21 is lifted off the valve seat 22 and fuel is diverted via the outflow channel 23. With regard to the design of these printing
    FOLLOWING 8 limit function is also referred to the pressure relief valve described in WO 2004/083695 AI. For the rinsing function, a cylinder 25 is now additionally provided, in which a cup-shaped formed actuating piston 26 is guided displaceably in the axial direction. For sealing, an outer piston seal 32 and an inner piston seal 33 are provided. The actuating piston 26 is acted upon by a compression spring 28 supported on a shoulder of the cover 27. On cylindrical guide surfaces 29 of the actuating piston 26, a bolt 30 is slidably guided in the axial direction, wherein the bolt 30 is acted upon by the pressure spring 24 supported on the cover 27 with the interposition of a dial 31.
    The assembly of the valve 13 is carried out such that initially the valve carrier 18 is screwed as a prefabricated unit with valve piston 21 and the like. With a corresponding torque in the cylinder 25. Thereafter, the actuating piston 2 6 is inserted with pre-assembled seals 32 and 33 in the cylinder 25. Then the compression springs 24 and 28 are used. After setting the opening pressure of the pressure relief valve by means of the dial 31, the cover 27 is finally screwed. For the rinsing function, the chamber 34 is acted upon via the opening 35 with compressed air, whereby the actuating piston 26 is acted upon in the opening direction. After overcoming the idle stroke defined by the axial gap a, the actuating piston 26 lifts the bolt 30 up to reaching the stroke stop while overcoming the piston stroke b. The actuating piston 26 acts for this purpose with a formed on the underside of the enlarged diameter
    POSSIBLE • · · · · · · · · · · · · ··· ··· «- 9 -
    Teller 36 trained stop surface together. The valve piston 21 is lifted completely out of the valve seat 22, so that the corresponding cross-section is made available for the flushing process. If the actuating piston 26 is no longer exposed to air, first press the two compression springs 24 and 28, the bolt 30 and the valve piston 21 in the starting position and then the compression spring 28, the actuating piston to the starting position. For the pressure limiting function, only the compression spring 24 is effective, the difference to a conventional pressure relief valve is merely that the compression spring 24, the valve piston 21 is acted upon by the interposition of the bolt 30.
    The interior of the cylinder 25 is filled with heavy oil. A leakage opening for the discharge of the heavy oil is designated 37.
    The present invention thus allows to combine the pressure relief valve with the purge valve. An advantage is the compact construction, the low cost and the need to name only one high-pressure connection.
    SUBSEQUENT
    权利要求:
    Claims (14)
    [1]
    1. Valve with a pressure-limiting function for common-rail fuel-injection systems for internal combustion engines comprising a valve carrier (18), a valve piston (21) displaceably mounted in the valve carrier (18) and cooperating with a valve seat (22) when the valve is closed, and a compression spring (24) acting on the valve piston (21) with a pressure force acting in the closing direction, characterized in that a bolt (30) acting on the valve piston (21) in the closing direction is controlled by means of an actuating means against the pressure force of the pressure spring (24) Opening the valve to form a flushing function is slidably disposed.
    [2]
    2. Valve according to claim 1, characterized in that the compression spring (24) acts on the valve piston (21) with the interposition of the bolt (30) in the closing direction.
    [3]
    3. Valve according to claim 1 or 2, characterized in that the compression spring (24) on the said bolt (30) facing away from the side with the interposition of a shim (31) is held.
    [4]
    4. Valve according to one of claims 1 to 3, characterized in that the actuating means comprises a in a cylinder (25) slidably mounted actuating piston (26) with a stop surface of the bolt (30) for displacing the bolt (30) against the Compressive force of the compression spring (24) can be brought into operative connection. REPLACED 11
    [5]
    5. Valve according to claim 4, characterized in that between the abutment surface of the bolt (30) and the corresponding counter surface of the Betätigugnskolbens (26) in the closed state of the valve, an axial gap (a) is provided.
    [6]
    6. Valve according to claim 4 or 5, characterized in that the actuating piston (26) is cup-shaped and on its inner circumference guide surfaces (29) for axially guiding the bolt (30).
    [7]
    7. Valve according to claim 4, 5 or 6, characterized in that the actuating means comprises a pneumatic means to pressurize the actuating piston (26) in the opening direction with pressure.
    [8]
    8. Valve according to one of claims 4 to 7, characterized in that a pressure medium, in particular compressed air, feedable line in a by the actuating piston (26) limited, on the compression spring (24) facing away from the actuating piston (26) arranged space ( 34) opens.
    [9]
    9. Valve according to one of claims 4 to 8, characterized in that a further, the actuating piston (26) in the closing direction of the valve directly acting on compression spring (28) is provided.
    [10]
    10. Valve according to claim 9, characterized in that the actuating piston (26) acted upon further compression spring (28) and the valve piston (21) acted upon compression spring (24) are arranged coaxially. | NACHGERElCi
    [11]
    11. Valve according to claim 9 or 10, characterized in that the actuating piston (26) acted upon further compression spring (28) which surrounds the valve piston (21) acting on compression spring (24).
    [12]
    12. Valve according to one of claims 1 to 11, characterized in that in the valve carrier (18) to the valve seat (22) leading high pressure bore (19) and at least one outflow channel (23) are formed.
    [13]
    13. Valve according to one of claims 1 to 12, characterized in that the valve carrier (18) releasably connected to the actuating means having the component, in particular screwed.
    [14]
    14. Fuel supply system for common 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 pump (5), wherein the high pressure pump (5) via at least one high pressure line (12) is connected to a high-pressure accumulator (rail) (6), which feeds at least one injection injector (8), and further with a valve (13), which is separately, preferably via its own high-pressure line, connected to the high-pressure accumulator (6) to control at least a subset of the heavy oil as needed via a return line (15) in the tank (1), characterized in that the valve (13) as a pressure limiting function and a rinsing function exhibiting valve (13) in particular according to one of claims 1 is formed to 13, wherein both valve functions under REACH 13 use the same valve seat (22) operate independently. Vienna, 27 September 2010 Applicants by:

    SUBSEQUENT i
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    同族专利:
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    CN103119346A|2013-05-22|
    US20130180607A1|2013-07-18|
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    AT510464B1|2012-07-15|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA1612/2010A|AT510464B1|2010-09-27|2010-09-27|VALVE WITH PRESSURE LIMITING FUNCTION|ATA1612/2010A| AT510464B1|2010-09-27|2010-09-27|VALVE WITH PRESSURE LIMITING FUNCTION|
    US13/876,286| US20130180607A1|2010-09-27|2011-09-27|Valve with pressure control function|
    CN201180046618.6A| CN103119346B|2010-09-27|2011-09-27|There is the valve of pressure-limiting function|
    EP11767888.8A| EP2622247B1|2010-09-27|2011-09-27|Valve having a pressure limiting function|
    JP2013529507A| JP5676765B2|2010-09-27|2011-09-27|Valve with pressure control function|
    PCT/AT2011/000395| WO2012040756A1|2010-09-27|2011-09-27|Valve having a pressure limiting function|
    KR1020137010789A| KR101546282B1|2010-09-27|2011-09-27|Valve having a pressure limiting function|
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