• 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:
    Exhaust gas recirculation fan (8) of an internal combustion engine, with a fan housing (13), with a fan shaft (11) and a fan impeller (12) connected to the fan shaft (11), with a drive (9) for the fan shaft (11) and the fan impeller (11), the drive (9) being designed as a hydraulic motor.
    公开号:CH716533A2
    申请号:CH00860/20
    申请日:2020-07-14
    公开日:2021-02-26
    发明作者:Rost Stefan；Mayr Stefan；Vonnoe Mark；Stork Manuel；Štefanák Petr
    申请人:Man Energy Solutions Se；
    IPC主号:
    专利说明:

    description
    The invention relates to an exhaust gas recirculation fan and an internal combustion engine.
    Internal combustion engines with exhaust gas recirculation are familiar to the person skilled in the art addressed here. In such internal combustion engines, it is known to take exhaust gas leaving the internal combustion engine from an exhaust branch of the internal combustion engine and to guide it via a so-called exhaust gas recirculation fan of the exhaust gas recirculation, which is also referred to as an EGR blower, in the direction of a charge air duct of the internal combustion engine and then the Mixing exhaust gas with the charge air to be supplied to the cylinders of the internal combustion engine.
    Exhaust gas recirculation blowers or EGR blowers are typically designed as turbo compressors that compress the exhaust gas to a defined pressure. An exhaust gas recirculation fan of an exhaust gas recirculation of an internal combustion engine comprises a stator, which has a fan housing, and a rotor, which has a fan shaft and a fan impeller. An electric motor typically drives the fan shaft and, via the fan shaft, drives the fan impeller of the exhaust gas recirculation fan.
    Driving the fan shaft with the aid of an electric motor requires a high-frequency electric motor and a frequency converter to control the electric motor. A frequency converter is housed in a separate control cabinet, whereby the frequency converter has to be cooled at high ambient temperatures. This results in a considerable space and cooling requirement. If a permissible limit temperature for the frequency converter is exceeded, the output of the electric motor and thus of the exhaust gas recirculation fan must be reduced.
    It may also be necessary to provide EMC shielding by means of complex measures. All of this makes the use of an electric motor to drive the fan shaft of an exhaust gas recirculation fan problematic.
    Proceeding from this, the present invention seeks to provide a novel exhaust gas recirculation fan and an internal combustion engine with such an exhaust gas recirculation fan.
    This object is achieved by an exhaust gas recirculation fan according to claim 1. According to the invention, the drive is designed as a hydraulic motor. The invention proposes to use a hydraulic motor, which is also referred to as a hydraulic motor, as the drive for the fan shaft and thus for the fan impeller of an exhaust gas recirculation fan. This offers a number of advantages over electric motors. No frequency converter, no cooling for the frequency converter and no EMC shielding are required. By using a hydraulic motor or hydraulic motor as a drive for the fan shaft of an exhaust gas recirculation fan, a more compact, robust and simple design of an exhaust gas recirculation fan can be provided. Furthermore, the load behavior, the acceleration behavior and the effectiveness can be increased.
    According to an advantageous development, the hydraulic motor is indirectly coupled to the fan shaft via a spur gear stage. Alternatively, the hydraulic motor is directly coupled to the fan shaft. The coupling of the hydraulic motor to the fan shaft via a spur gear stage is particularly preferred in the case of high-speed exhaust gas recirculation fans, which are therefore rotating at relatively high speeds. In the case of exhaust gas recirculation fans at low speed or at a relatively low speed, it is advantageous to couple the hydraulic motor directly to the fan shaft.
    Then, when the hydraulic motor is indirectly coupled to the fan shaft via a spur gear stage, it is of particular advantage if intermeshing gears of the spur gear stage are helical. In this case, some of the axial forces can already be absorbed by a bearing of the hydraulic motor, so that a single axial bearing is sufficient in the area of the fan shaft, which is particularly preferred to increase the compactness with a radial bearing of the fan shaft as a combined axial-radial -Bearing can be executed.
    The internal combustion engine with an exhaust gas recirculation fan is defined in claim 7.
    Preferred developments of the invention emerge from the subclaims and the following description. Exemplary embodiments of the invention are explained in more detail with reference to the drawing, without being restricted thereto. It shows:
    1 shows a block diagram of an internal combustion engine with exhaust gas recirculation and an exhaust gas recirculation Ge
    bladder;
    2 shows a first embodiment of an exhaust gas recirculation fan according to the invention;
    3 shows a second embodiment of an exhaust gas recirculation fan according to the invention; and
    4 shows a third embodiment of an exhaust gas recirculation fan according to the invention.
    The invention relates to an exhaust gas recirculation fan for an exhaust gas recirculation system of an internal combustion engine.
    Such an exhaust gas recirculation fan is used to promote and compress exhaust gas, which is taken from an exhaust tract of an internal combustion engine and with the help of the exhaust gas recirculation fan in the direction of a loading
    air tract of the internal combustion engine is promoted. The invention also relates to an internal combustion engine with exhaust gas recirculation.
    Fig. 1 shows a block diagram of an internal combustion engine 1 with several cylinders 2. During operation of the internal combustion engine 1, exhaust gas is produced which leaves the cylinder 2 of the internal combustion engine 1 and is directed towards a turbine 4 of an exhaust gas turbocharger 3 of the internal combustion engine 1. The exhaust gas leaving the cylinder 2 of the internal combustion engine 1, which is routed via the turbine 4 of the exhaust gas turbocharger 3, is expanded in the turbine 4, whereby the energy obtained is used to supply the cylinder 2 of the internal combustion engine 1 with charge air in the compressor 5 of the exhaust gas turbocharger 3 to condense.
    The internal combustion engine 1 of Fig. 1 has an exhaust gas recirculation 6. The exhaust gas recirculation 6 includes an exhaust gas recirculation cooler 7 and an exhaust gas recirculation fan 8. The exhaust gas recirculation cooler 7 is used to cool exhaust gas, which in Fig. 1 upstream of the Turbine 4 is taken from an exhaust tract to be led to turbine 4 at high pressure. The exhaust gas recirculation fan 8 is used to convey the exhaust gas routed via the exhaust gas recirculation cooler 7 in the direction of the charge air tract of the internal combustion engine in order to mix this exhaust gas recirculation with the compressed charge air downstream of the compressor 5.
    The internal combustion engine 1 is, in particular, an internal combustion engine in which heavy oil or gas is burned, for example a ship's internal combustion engine.
    Such an internal combustion engine has, in the area of each cylinder 2, gas exchange valves (not shown) and fuel valves in order to supply the cylinders with fuel and charge air for the combustion of fuel in the cylinders 2 and also to discharge exhaust gas from the cylinders 2.
    According to the invention, the exhaust gas recirculation fan 8 comprises a hydraulic motor 9 as an output. The hydraulic motor
    9 serves to drive a fan shaft, not shown in detail in FIG. 1, of a rotor of the exhaust gas recirculation fan 8, the fan shaft carrying a fan impeller which is driven via the fan shaft. Details of the exhaust gas recirculation fan 8 are described below with reference to the exemplary embodiments in FIGS. 2 to 4.
    The hydraulic motor 9 of the exhaust gas recirculation fan 8 is also referred to as a hydraulic motor, such a hydraulic motor converting hydraulic energy into mechanical work. To supply the hydraulic motor 9 with hydraulic energy, the same is coupled to a hydraulic system 10 of the internal combustion engine, this hydraulic system
    10 is also used for the hydraulic actuation of the gas exchange valves and / or the fuel valves of the cylinders 2 of the internal combustion engine 1, in particular in the case of 2-stroke internal combustion engines. The hydraulic motor 9 can accordingly be connected in a simple manner to an existing hydraulic system 10 of an internal combustion engine 1 in order to supply the hydraulic motor 9 with hydraulic energy via the hydraulic system 10.
    Fig. 2 shows a first embodiment of an exhaust gas recirculation fan 8 together with a hydraulic motor 9, wherein the hydraulic motor 9 is used to drive a fan shaft 11 of a rotor of the exhaust gas recirculation fan 8, on this fan shaft 11 a fan Impeller 12 is arranged, which is used to compress the exhaust gas routed via exhaust gas recirculation 6. The fan shaft 11 and the fan impeller 12 are accordingly part of the rotor of the exhaust gas recirculation fan 8, the rotor also comprising a stator, which has a fan housing 13, in addition to the rotor.
    In the exemplary embodiment shown in FIG. 2, the hydraulic motor 9 is indirectly coupled to the fan shaft 11 via a spur gear stage 14 which provides a translation. In FIG. 2, intermeshing gears 15, 16 of the spur gear stage 14 are straight-toothed. The gear 15 sits on the fan shaft 11 and the gear 16 sits on a shaft 19 of the drive or hydraulic motor 9. In the embodiment of FIG Fan housing 13 is preferably supported by two axial bearings and one radial bearing. For each direction of force, that is to say both for a thrust direction and for a counter-thrust direction, there is an axial bearing, which is provided in FIG. 2 by a combined, double-acting axial bearing 17. Providing a so-called floating bearing for the fan shaft
    11, a single radial bearing 18 is sufficient. However, there can also be two radial bearings. For reasons of installation space, both axial bearings are provided by a common, double-acting axial bearing 17. Two separate axial bearings can also be used. The axial bearings and radial bearings are preferably hydraulic bearings.
    Fig. 3 shows a modification of the embodiment of FIG. 2, in which the intermeshing gears 15, 16 of the spur gear stage 14 are helical. Axial forces in the opposite thrust direction can then already be absorbed by the hydraulic motor 9. In this case, it is sufficient to provide a single axial bearing and a single radial bearing in the area of the fan shaft 11, which are then preferably designed as a combined axial-radial bearing 20 to provide a particularly compact design. However, it is also possible to design thrust bearings and radial bearings as independent assemblies. In turn, hydraulic bearings are preferably used. In Fig. 3, in addition to the combined axial-radial bearing 20, a further radial bearing 21 for the fan shaft 11 is shown.
    The fan shaft 11 and a shaft 19 of the hydraulic motor 9 are preferably mounted together in the fan housing 13, which functions as a bearing housing. This is preferred in order, on the one hand, to provide a compact design.
    权利要求:
    Claims (8)
    [1]
    1. Exhaust gas recirculation fan (8) of an internal combustion engine,
    with a fan housing (13),
    with a fan shaft (11) and a fan impeller (12) connected to the fan shaft (11),
    with a drive (9) for the fan shaft (11) and the fan impeller (12), characterized in that
    the drive (9) is designed as a hydraulic motor.
    [2]
    2. Exhaust gas recirculation fan according to claim 1, characterized in that the fan shaft (11) is mounted in the fan housing (13), namely via at least one preferably hydraulic axial bearing and at least one preferably hydraulic radial bearing.
    [3]
    3. Exhaust gas recirculation fan according to claim 1 or 2, characterized in that the hydraulic motor (9) is indirectly coupled to the fan shaft (11) via a spur gear stage (14).
    [4]
    4. Exhaust gas recirculation fan according to claim 3, characterized in that intermeshing gears (15, 16) of the spur gear stage (14) are spur-toothed, and that the fan shaft (11) in the fan housing (13) has a double-acting axial bearing ( 17) and at least one radial bearing (18) is mounted.
    [5]
    5. Exhaust gas recirculation fan according to claim 3, characterized in that intermeshing gears (15, 16) of the spur gear stage (15) is helical, and that the fan shaft (11) in the fan housing (13) at least over a combined axial -Radial bearing (20) is mounted.
    [6]
    6. Exhaust gas recirculation fan according to claim 1 or 2, characterized in that the hydraulic motor (9) is coupled directly to the fan shaft (11).
    [7]
    7. Internal combustion engine (1), in particular large internal combustion engine operated with heavy oil or gas such as a ship's internal combustion engine,
    with several cylinders (2), gas exchange valves and / or fuel valves being controllable from a hydraulic system (10) of the internal combustion engine,
    with an exhaust gas turbocharger (3) having a turbine (4) and a compressor (5), exhaust gas leaving the cylinders (2) in the turbine (4) being expandable and the energy gained in this way in the compressor (5) for compressing the cylinders (2 ) the charge air to be supplied can be used,
    with an exhaust gas recirculation fan (8) having an exhaust gas recirculation (6),
    characterized in that
    the exhaust gas recirculation fan (8) is designed according to one of claims 1 to 6, wherein the hydraulic motor (9) is coupled to the hydraulic system (10) of the internal combustion engine.
    [8]
    8. Internal combustion engine according to claim 7, characterized in that the same is a 2-stroke large internal combustion engine operated with heavy oil or gas.
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    同族专利:
    公开号 | 公开日
    KR20210024419A|2021-03-05|
    DE102019122643A1|2021-02-25|
    CN112412670A|2021-02-26|
    JP2021032250A|2021-03-01|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US6164071A|1997-09-08|2000-12-26|Cummins Engine Company, Inc.|EGR delivery and control system using dedicated full authority compressor|
    DE102012009319B4|2012-05-10|2018-11-08|Man Diesel & Turbo, Filial Af Man Diesel & Turbo Se, Tyskland|Two-stroke large diesel engine with Rezirkulationsgasverdichter and thus coupled steam turbine|
    KR20140114512A|2013-03-15|2014-09-29|현대자동차주식회사|Centrifugal supercharger and supercharging system for engine|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102019122643.0A|DE102019122643A1|2019-08-22|2019-08-22|Exhaust gas recirculation fan and internal combustion engine|
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