CN113757015A - 用于燃料高压泵的阀 - Google Patents
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- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
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- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
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- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
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- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
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- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
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- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
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- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
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- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
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Abstract
本发明提出一种阀和具有这种阀的燃料高压泵(22)。所述阀尤其具有阀元件(51)和阀止挡(94),所述阀止挡限制所述阀元件(51)朝打开方向的运动。为了防止在压缩汽油‑水‑乳剂时阀元件(51)液压粘接在阀止挡(94)上,在阀元件(51)和/或阀止挡(94)上设置有疏水表面。
Description
技术领域
本发明涉及一种用于燃料高压泵的阀和燃料高压泵以及借助所述燃料高压泵压缩汽油-水-乳剂的方法。
背景技术
由现有技术,公开文献DE 10 2018 209 155 A1已知一种具有入口阀的燃料高压泵,并且也已知借助该燃料高压泵压缩汽油-水-乳剂。
发明内容
本发明基于发明人的以下认识:在借助燃料高压泵压缩汽油-水-乳剂时,会出现水滴附着在燃料高压泵的表面上。尤其在燃料高压泵的阀的区域中,这种水滴会导致附着效应或者说粘接效应,其会减缓或者甚至阻止阀的关闭。尤其在可运动的阀元件与阀止挡之间的间隙区域中是这种情况,该阀止挡限制阀元件朝打开方向的运动。泵的功能可能由此受到损害。
本发明提出一种用于燃料高压泵的阀,其中,所述阀具有阀元件和阀座以及具有阀止挡,所述阀元件朝关闭方向密封地贴靠在所述阀座上,所述阀止挡限制所述阀元件朝打开方向的运动,其中,所述阀止挡至少在面向所述阀元件的区域中具有疏水表面和/或所述阀元件在面向所述阀止挡的区域中具有疏水表面。由此实现,阀元件和/或阀止挡的表面在该区域中是防水的。因此,没有水滴能够附着,并且与高压泵的仅压缩燃料(如汽油)的运行相比,阀的关闭可以不受损害地进行。
疏水表面尤其可以理解为这样的表面:水滴不附着在该表面上,而是滚落,即似乎滑过。尤其,具有相对于水大于90°的接触角的表面被称为疏水的。疏水表面尤其由疏水物质构成或被这些疏水物质覆盖。
因为阀的部件是承受高机械负载的构件,所以优选地,阀止挡和/或阀元件由硬化的钢、尤其是硬化的马氏体钢构成。在钢硬化的情况下通常形成氧化边缘层,该氧化边缘层众所周知地具有亲水特性。为了避免与此相关的、上面已说明的危害,尤其设置,至少在阀止挡的面向阀元件的区域中在氧化边缘层上布置有疏水层,和/或至少在阀元件的面向阀止挡的区域中在氧化边缘层上布置有疏水层。
疏水层可以是本身已知的硅烷层,该硅烷层又例如能够在洗涤过程中施加。这具有以下优点:在现有的制造过程的范畴内施加该层几乎不产生附加成本。
替代于将疏水层施加到氧化边缘层上,在本发明的范畴内可以将该氧化边缘层去除,只要在其下方存在疏水的基本材料。氧化边缘层的去除可以是非常选择性的,然而,通常是相当费事的。
可以设置,阀元件不是整面地以其面向阀止挡的一侧贴靠在阀止挡上,而是阀止挡具有突出区域,这些突出区域朝阀元件的方向突出,并且阀元件可以贴靠在这些突出区域上,以便限制其朝打开方向的运动;和/或阀元件具有突出区域,这些突出区域朝阀止挡的方向突出并且阀元件能够以这些突出区域贴靠在阀止挡上。
在对此的改进方案中可以设置,(阀止挡或阀元件的)设置有疏水表面的面向的区域包括至少两个突出区域,相对置的构件(即阀元件或阀止挡)可以贴靠在所述至少两个突出区域上,并且附加地包括至少一个另外的区域,该另外的区域布置在所述至少两个突出区域之间。这具有以下优点:即使在突出区域中的疏水表面由于与相对置的构件的相互作用所引起的磨损而丧失其疏水特性时,或者即使在突出区域中的疏水层由于磨损而被去除时,疏水特性或者说疏水层仍然存在于这些突出区域之间,并且从那里继续发挥作用,使得水滴不会附着在阀元件和阀止挡之间。
因此,该扩展方案的优点在于,疏水表面或疏水层不必一定具有与构件的位于其下方的基础材料相同的耐磨性(例如不必一定具有相同的硬度)。
如果阀元件与止挡元件之间的接触面积小于阀元件与止挡元件的面向彼此的侧面的总面积,例如分别小于1/10或甚至小于1/50,则特别产生上述优点。
所述阀优选是燃料高压泵的入口阀。附加地或替代地,所述阀也可以是出口阀和/或限压阀和/或燃料高压泵的另一种阀。
本发明还涉及一种燃料高压泵,其具有泵壳体和布置在所述泵壳体中的活塞室,所述活塞室由能够在所述泵壳体中移动的泵活塞限界,所述燃料高压泵具有至少一个根据本发明的阀,该阀朝向所述活塞室打开或远离所述活塞室打开。
本发明还涉及一种借助根据本发明的的燃料高压泵压缩汽油-水-乳剂的方法。
附图说明
图1示出用于内燃机的燃料系统的简化的示意图;
图2以截面图示出本身已知的燃料高压泵;
图3示例性地以截面图示出根据本发明的阀;
图4示出图3的阀的阀止挡的与阀元件相对置的一侧的俯视图。
具体实施方式
图1以简化的示意图示出用于未进一步示出的内燃机的燃料系统10。在燃料系统10的运行中,燃料从燃料箱12经由抽吸管路14借助预输送泵16和低压线路18经由入口接管20供应给实施为活塞泵的燃料高压泵22。在入口接管20的流体下游布置有入口阀24,活塞室26可以通过该入口阀与低压区域28流体连通,该低压区域包括预输送泵16、抽吸管路14和燃料箱12。低压区域28中的压力脉冲可以借助压力减振器装置29阻尼。入口阀24可以通过操纵装置30被强制地打开。操纵装置30和从而入口阀24能够通过控制单元32操控。
燃料高压泵22的活塞34可以借助当前实施为凸轮盘的驱动装置36沿着活塞纵轴线38上下运动,这通过带有附图标记40的箭头示意性地示出。出口阀44液压地布置在活塞室26与燃料高压泵22的出口接管42之间,该出口阀可以朝向高压存储器46(“轨”)打开。
通过限压阀48能够将高压存储器46与活塞室26流体连通,该限压阀在超过高压存储器46中的极限压力时打开。限压阀48构造为弹簧加载的止回阀并且可以朝向活塞室26打开。
燃料高压泵22在图2中以截面图示出。在图2的示图中可看到,操纵装置30包括弹簧加载的推杆49。推杆49能够通过电磁线圈50运动并且可以强制地打开入口阀24的同样被弹簧加载的阀元件51。
在图2的示图中,压力减振器装置29布置在燃料高压泵22的上部区域中。压力减振器装置29包括罐状的盖元件54,该盖元件与泵壳体52在连接区域56中连接。
泵壳体52和盖元件54限界压力减振器装置29的内室58。在压力减振器装置29的内室58中布置有膜片减振器60。该膜片减振器包括在附图中上方的第一膜片62和在附图中下方的第二膜片64,它们在边缘侧相互焊接。上膜片62和下膜片64包围减振容积66,该减振容积填充有气体并且是可压缩的,因为两个膜片62和64分别是用于减振容积66的柔性壁。
膜片减振器60在边缘侧通过支撑元件68支撑在泵壳体52上并且在轴向方向或者说在附图中竖直的方向上沿着活塞纵轴线38与该泵壳体间隔开地布置。弹性元件70与支撑元件68相对置地布置在膜片减振器60和盖元件54之间。膜片减振器60通过弹性元件70支撑在盖元件54上并且在轴向方向38上与该盖元件间隔开地布置。整体上,膜片减振器60通过支撑元件68和弹性元件70在边缘侧被压紧在盖元件54与泵壳体52之间。
在燃料高压泵22的运行中,低压区域28中的燃料被激励成压力脉冲。这些压力脉冲可以通过膜减振器60的压缩或减压来补偿。
在图3中放大地示出高压燃料泵22的入口阀24。该入口阀由硬化的马氏体钢构成并且包括固定在燃料高压泵22中的阀座体91,在该阀座体上形成阀座92,并且该入口阀包括阀元件51,该阀元件朝关闭方向密封地贴靠在阀座92上。入口阀24还包括阀止挡94,该阀止挡通过机械止挡限制阀元件51朝打开方向的运动。阀元件51还通过阀弹簧95抵靠着阀止挡94支撑。
阀元件51的面向阀止挡94的面在该示例中平坦地实施。相反,如图4所示,阀止挡94的面向阀元件51的面具有五个突出区域96,这些突出区域朝阀元件51的方向突出。阀元件51在阀的关闭状态下贴靠在这些突出区域96上。
阀止挡94的阀元件51所贴靠的区域以及阀元件51的面向阀止挡94的整个侧面具有氧化边缘层并且在该氧化边缘层上具有硅烷层99。硅烷层99具有疏水特性,使得没有水滴能够附着在阀止挡94和阀元件51上。以这种方式,在压缩汽油-水-乳剂时(并且甚至在压缩水时)也可靠地排除了阀元件51与阀止挡94之间的液压粘接。
Claims (9)
1.一种用于燃料高压泵(22)的阀,其中,所述阀具有阀元件(51)和阀座(92)以及具有阀止挡(94),所述阀元件(51)朝关闭方向密封地贴靠在所述阀座上,所述阀止挡限制所述阀元件(51)朝打开方向的运动,其特征在于,所述阀止挡(94)至少在对所述阀元件(51)面向的区域中具有疏水表面(99)和/或所述阀元件(51)在对所述阀止挡(94)面向的区域中具有疏水表面。
2.根据权利要求1所述的阀,其特征在于,所述阀止挡(94)由硬化的钢构成并且具有氧化边缘层,并且至少在所述阀止挡(94)的对所述阀元件(51)面向的区域中在该氧化边缘层上布置有疏水层(99),和/或
所述阀元件(51)由硬化的钢构成并且具有氧化边缘层,并且至少在所述阀元件(51)的对所述阀止挡(94)面向的区域中在该氧化边缘层上布置有疏水层。
3.根据权利要求1或2所述的阀,其特征在于,所述阀止挡(94)具有突出区域(96),这些突出区域朝所述阀元件(51)的方向突出,并且所述阀元件(51)能够贴靠在这些突出区域上,以便限制所述阀元件朝打开方向的运动,和/或
所述阀元件(51)具有突出区域(96),这些突出区域朝所述阀止挡(94)的方向突出,并且所述阀元件(51)能够以这些突出区域贴靠在所述阀止挡(94)上,以便限制所述阀元件朝打开方向的运动。
4.根据权利要求3所述的阀,其特征在于,设置有疏水表面的所述面向的区域包括至少两个突出区域(96),并且附加地包括布置在所述至少两个突出区域(96)之间的至少一个另外的区域。
5.根据前述权利要求中任一项所述的阀,其特征在于,所述疏水表面通过构造硅烷层(99)来制造。
6.一种燃料高压泵(22),其具有泵壳体(52)和布置在所述泵壳体(52)中的活塞室(26),所述活塞室由能够在所述泵壳体(52)中移动的泵活塞(34)限界,所述燃料高压泵具有至少一个阀,该阀朝向所述活塞室(26)打开或远离所述活塞室(26)打开,其特征在于,所述阀是根据前述权利要求中任一项所述的阀。
7.根据权利要求6所述的燃料高压泵,其特征在于,所述阀是所述燃料高压泵(22)的入口阀(24)。
8.根据权利要求7所述的燃料高压泵,其特征在于,所述阀是所述燃料高压泵(22)的出口阀(44)或限压阀(48)。
9.一种借助根据权利要求6至8中任一项所述的燃料高压泵(22)压缩汽油-水-乳剂的方法。
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