CN101652542A - 晃荡罐 - Google Patents

晃荡罐 Download PDF

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CN101652542A
CN101652542A CN200880010942A CN200880010942A CN101652542A CN 101652542 A CN101652542 A CN 101652542A CN 200880010942 A CN200880010942 A CN 200880010942A CN 200880010942 A CN200880010942 A CN 200880010942A CN 101652542 A CN101652542 A CN 101652542A
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R·黑伯尔
M·霍恩
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Robert Bosch GmbH
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    • F01N3/2066—Selective catalytic reduction [SCR]
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    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/03328—Arrangements or special measures related to fuel tanks or fuel handling
    • B60K2015/03348—Arrangements or special measures related to fuel tanks or fuel handling for supplying additives to fuel
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    • B60K15/03—Fuel tanks
    • B60K2015/03328—Arrangements or special measures related to fuel tanks or fuel handling
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    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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Abstract

本发明涉及一种特别是用于接收还原剂的箱体(10)，该还原剂用于定量供给到内燃机的排气管中。在所述箱体(10)的空腔(44)中接收有一晃荡罐(20)。所述晃荡罐(20)以其下部区域在箱底(14)中的凹部(16)内被轴向地和径向地导向。

Description

晃荡罐
背景技术
在具有内燃机的车辆中，由于近年来废气法规日益严格，尤其必须减少有害物质NOx。应用的方法是SCR(选择性催化还原)方法，在该方法中借助于液态还原剂将有害物质NOx还原成N2和H2O。液态的还原剂存储在箱体中并由输送模块经由管道被从箱体输送至定量模块。因为还原剂在低于-11℃的温度时冻结，所以箱体必须装备有加热装置。该加热装置在需要时接通并使冻结的还原剂解冻。加热装置包括传感装置安装在一盆中。该盆同时用作晃荡罐并定位在箱体内部。因为在液体上方始终存在气垫，所以箱体由原理决定地从箱底开始冻结。由于结冰，晃荡罐首先在箱体的底部处被固定。
因为还原剂在冻结时膨胀了其原始体积的约10％，所以晃荡罐必须柔性地固定在箱盖上。如果冻结的还原剂由于体积膨胀而压靠到箱盖上，则箱盖由于晃荡罐的柔性固定而能向上挠曲。因此排除了由于冰压对晃荡罐的损害。迄今应用的解决方案的前提条件是：晃荡罐卡锁在箱体的下部区域中并在上部区域内柔性地联接到箱盖上。在下部区域内的卡锁是非常复杂的，通常与此相应的箱体以吹塑法制造并且因此至少一个需附加地执行的焊接过程是必需的。
由EP 1 561 016已知一种用于后处理内燃机废气的方法，在该方法中使用液态还原剂作为处理用辅助剂。当液态还原剂的温度低于临界值时，会激发还原剂部分地化学转化成使还原剂冰点降低的物质。
发明内容
按照本发明提出，在箱底中的凹部内沿着导向区段径向地和轴向地对晃荡罐导向，该晃荡罐用于衰减在特别是接收有还原剂的箱体中的流体的运动。为此，优选以吹塑法制成的箱体可以配设有多个翻起部，这些翻起部可例如是肋状构成的。这些特别是在以吹塑法制成的箱体的箱底中构成的、设计成肋状的翻起部具有一接触面，所述接触面指向在箱底的凹部中被导向的晃荡罐，特别是在设置在箱底中的凹部的圆周上的各翻起部和在晃荡罐的外壳面中的相对应的缺口之间构成一锥角。
通过在例如星形地围绕凹部设置的、优选设计成肋状的翻起部的接触面和与之相对应地构成的、在晃荡罐的导向区域内的在该晃荡罐的外壳面中的缺口之间的锥角的构造，实现晃荡罐在沿着箱底中的凹部的壁面构成的导向区段中的径向和轴向的导向。箱底中的凹部同时用作泵池。优选地，在箱底中例如以相互间的120°布置在吹模中构成优选设计成肋状的翻起部，晃荡罐以其导向区域插入这些翻起部中，所述导向区域具有与在箱底中构成的翻起部的数目相当的数目的缺口。
通过至少三个在箱底中围绕凹部设置的肋状构成的翻起部或与此相对应的在晃荡罐的外壳面中的缺口，通过形成锥角、即在凹部和晃荡罐之间的锥度实现晃荡罐和箱体相互间的径向固定。此外，特别是肋状构成的翻起部的局部构造使得储存在箱体内的还原剂能流入到箱体的池区域中。
优选地，借助于弹簧元件将晃荡罐相对于箱盖轴向地预紧。由于固定在箱体内，即在导向区域内部固定在构成在晃荡罐的外壳面中的缺口和与此相对应地设置在箱底中的优选肋状构成的翻起部之间，晃荡罐以沿轴向作用的弹簧元件抗摇晃地支撑在储存有还原剂的箱体的空腔内。
附图说明
下面根据附图深入地说明本发明。
图中：
图1示出在箱体中在导向区域内部在箱底上被径向地和轴向地导向的晃荡罐的侧视图，
图2示出在晃荡罐从箱体中取出时箱底的俯视图，以及
图3示出根据图1的、带有在圆周上示出的缺口的晃荡罐的底面。
具体实施方式
按照图1的视图示出用于特别是用于接收还原剂的箱体，在该箱体的箱底中构造有用于对借助于弹簧预紧的晃荡罐进行导向的导向区域。
图1示出箱体10，该箱体通过箱壁12和箱底14界定。箱体10优选以吹塑方法在吹塑模具中制造并由塑料制成。
箱体10包括箱底14，在该箱底中构造有一形成池18的凹部16。优选在箱体10中接收在外部温度低于-11℃时会冻结的、用于处理废气的还原剂。
由按照图1的视图可见，一晃荡罐20可动地接收在箱体10中。该晃荡罐20具有外壳面22以及上侧24和底部26。
由按照图1的视图可见，晃荡罐20以其在外壳面22的下部区域内构成的导向区域28在箱底14的凹部16中被导向。为此，在箱底14中围绕凹部16构造多个优选肋状构成的翻起部30，这些翻起部30例如圆形地设置。这些特别是肋状构成的翻起部30可以例如围绕凹部16例如以120°的角度间隔(见按照图2的视图)构造在箱底14中。在图1中示出的翻起部30可以例如被嵌入到吹模中，在该吹模中制造以吹模方法制成的箱体10。由图1可见，优选设计成肋状的缺口30具有接触面32。该接触面32在导向区域28上延伸，也就是说，在晃荡罐20的外壳面22的下部区域上延伸，该晃荡罐20根据行程46在轴向上可动地接收在凹部16中。
晃荡罐20的特别好的轴向和径向的导向可通过锥度34实现，该锥度在接触面32和外壳面22中的与该接触面32相对应的缺口之间在晃荡罐20的导向区域28内制成。特别是，接触面32和晃荡罐20的外壳面22之间的锥度34可以通过锥角36表征，该锥角可以在5°至15°的范围内。
优选地，在箱底14中围绕凹部16制造多个优选设计成肋状的翻起部30，从而晃荡罐20在导向区域28内在至少三个位置上在箱底14的凹部16内被轴向地和径向地导向。
如由按照图1的视图进一步可见，晃荡罐20的上侧24被例如构造为弹簧的弹性元件42加载。该弹性元件42在晃荡罐20的上侧24的外部支撑在封闭箱体10的箱盖38的内侧40上。通过用在图1中示出的弹簧元件42对晃荡罐20加载实现晃荡罐20相对于箱盖38的预紧。由于固定在箱体10的空腔44中，晃荡罐20抗摇晃地支撑在箱体10的空腔44中。该支撑的刚度可通过导向区域28的高度的变化来实现，即通过一区域的变化来实现，在该区域中优选肋状构成的翻起部30的接触面32配合到晃荡罐20的外壳面22中的相应地对应构造的缺口中。该导向区域28的轴向长度选得越大，晃荡罐20相对于箱底14中的凹部16的导向就越长，并且晃荡罐20就可以构建得越高。
图2示出在图1中示出的箱体的箱底的视图，其中没有示出晃荡罐。
由图2可知，以例如120°的角度间隔58在箱底14中围绕凹部16设置有三个优选设计成肋状的翻起部30。代替在图2中示出的三个在箱底14中围绕凹部16设置的、优选设计成肋状的翻起部30，也可在箱底14中设有四个或更多的翻起部30。由所述优选肋状构成的翻起部得到120°的间隔58，如图2所示。在构造在箱底14中的凹部16中，由于翻起部是局部构成的，还原剂的剩余部分能够汇集在池18中，如图1所示。
由图3的视图可看到晃荡罐的底部。
图3示出，沿着晃荡罐20的底部26的圆周76设置有多个优选设计成肋状的翻起部30，这些优选设计成肋状的翻起部30数目根据按照图3视图与缺口48的数目相对应。在按照图3的视图中，缺口48构造有倒圆50，图2中所示的、优选肋状构成的翻起部30的相应的凸起配合在所述倒圆50中，这些翻起部围绕凹部16构造在箱体10的箱底上。由于在倒圆50和优选肋状示出的翻起部30的相应的尖端之间的直径差而产生自由空间，储存在箱体的空腔44内的还原剂能通过这些自由空间流向池18。通过在晃荡罐20的底部26的圆周56上的或者说在晃荡罐20的外壳面22的导向区域28中的倒圆50与优选肋状构成的翻起部之间的直径差，能实现晃荡罐20在箱底14中的凹部16内的轴向和径向的导向。因为池18按照图1中的视图与箱体10的几何形状相关地构造在箱底14的下侧上，所以还原剂在池18内的冻结引起晃荡罐20克服支撑在箱盖38内侧40上的弹性元件42的作用而垂直移动。由图1可知，根据重合部、即在箱底14中的优选肋状构造的翻起部的接触面32和在晃荡罐20的底部26和外壳面22中的相对应的缺口48(见图3的视图)之间的导向区域28的长度，能根据晃荡罐20的通过双向箭头46所示的行程来补偿相对于导向区域28的垂直移动。通过以弹性元件42对晃荡罐20的上侧24的加载，可以实现晃荡罐20在箱体10中的抗摇晃的布置，因为该晃荡罐一方面在导向区域28内被轴向和径向地在箱底14中的凹部16内导向，另一方面通过弹性元件42在其上侧上沿轴向预紧。
在盖38和箱体12之间存在一弹性体密封件61。该弹性密封件密封在盖38的区域内的一区域62上。弹性体密封件61沿轴向延长，被拉到晃荡罐20的上边缘上并在压紧的范围内固定在那里。弹性体密封件31赋予晃荡罐20在上部区域内较大的径向稳定性。另一方面，弹性体密封件61防止晃荡罐10例如在强烈的曲线倾斜时排空。液体撞击到弹性体密封件61上并从那里返回到晃荡罐20中。弹性体密封件61具有轴向弹性，该弹性能吸收还原剂在从液态变成固态时的体积膨胀。

Claims (10)

1.一种特别是用于接收还原剂的箱体(10)，该还原剂用于定量供给到内燃机的废气中，其中，所述箱体(10)通过箱壁(12)、箱底(14)以及箱盖(38)界定并且在所述箱体(10)的空腔(44)中接收有一晃荡罐(20)，其特征在于，所述晃荡罐(20)在导向区域(28)内在箱底(14)的凹部(16)中轴向地和径向地被导向。
2.根据权利要求1所述的箱体(10)，其特征在于，所述晃荡罐(20)的上侧(24)通过弹性元件(42)被加载以轴向的预紧力。
3.根据权利要求1所述的箱体(10)，其特征在于，在所述箱体(10)的箱底(14)中构造有一形成池(18)的凹部(16)。
4.根据权利要求1所述的箱体(10)，其特征在于，在所述箱底(14)中构造有多个优选肋状构成的翻起部(30)，所述翻起部以圆形形状围绕凹部(16)设置在箱底(14)中。
5.根据权利要求4所述的箱体(10)，其特征在于，所述箱底(14)中的、优选肋状构成的翻起部(30)具有锥形走向的接触面(32)。
6.根据权利要求4所述的箱体(10)，其特征在于，所述箱底(14)中的、优选肋状构成的翻起部(30)的接触面(32)的锥度(34)与晃荡罐(20)的外壳面(21)中的缺口(48)的锥度相对应。
7.根据权利要求1所述的箱体(10)，其特征在于，所述晃荡罐(20)的上侧由支撑在箱盖(38)上的弹性元件(42)加载。
8.根据权利要求1所述的箱体(10)，其特征在于，沿着导向区域(28)在晃荡罐(20)的外壳面(22)上构造有与优选肋状构成的翻起部(30)的数目相当的数目的缺口(48)。
9.根据权利要求8所述的箱体(10)，其特征在于，在导向区域(28)内构造在底部(26)的圆周(56)上和外壳面(22)上的缺口(48)具有倒圆(50)。
10.根据上述权利要求所述的箱体(10)，其特征在于，在箱底(14)中的、优选肋状构成的缺口(30)的倒圆半径小于晃荡罐(20)在其导向区域(28)内在底部(26)的圆周(56)上和外壳面(22)上的缺口(48)的倒圆(50)半径。
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DE102009046956A1 (de) 2009-11-23 2011-05-26 Robert Bosch Gmbh Reduktionsmittel-Vorratsbehälter
DE102011081489A1 (de) * 2011-08-24 2013-02-28 Robert Bosch Gmbh Tankanordnung sowie Abgasreinigungseinrichtung
DE102011118652A1 (de) 2011-11-16 2013-05-16 Emitec France S.A.S Fördereinheit zur Förderung eines flüssigen Additivs
DE102014206464A1 (de) 2014-04-03 2015-10-08 Bayerische Motoren Werke Aktiengesellschaft Reduktionsmittelbehälter eines Kraftfahrzeugs
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