均有现货北京华德换向阀4WE10G31B/CW220-50NZ5L

液压系统中,泄漏影响产品的质量,是必须要考虑的问题。例如液压缸,严重的泄漏不仅会使设备周围的环境受到污染,还会导致液压缸工作腔的压力降低,使液压缸无法正常工作。采取比较先进的方法,有效地防止泄漏，使液压系统实现“零泄漏”是液压行业多年来始终追求的目标。另外,准确地分析液压系统泄漏产生的Zui初原因,可以帮助我们及时排除液压系统的泄漏故障。作为机械专业的学生，我们通过对《液压与气压传动》课程的学习以及查阅相关资料，结合自己专业实习、工程训练和日常生活中的所见和所想，就常见泄漏故障问题，分析了液压传动的泄漏形式及原因，提出控制泄漏的措施。

　　相对于机械传动,液压传动是一门新的技术，起源于1654年帕斯卡提出的静压传动原理。它是以液体为工作介质，通过能量转换装置来进行能量传递的一种传动形式。液压传动具有如下优点:①工作液体可以用管道输送到任何位置;②执行元件的布置不受方位限制,借助油管的连接可以方便灵活地布置传动机构;③液压传动能将原动机的旋转运动变为直线运动;④可以方便地实现无级调速;⑤载荷控制、速度控制以及方向控制容易实现,也容易进行集中控制、摇控和自动控制;⑥液压传动平稳无振动;⑦具有良好的润滑条件可提高液压元件工作的可靠性和使用寿命;⑧液压元件有利于实现标准化、系列化和通用化。因此，液压传动在国民经济各部门中得到了广泛的应用。

　　但液压传动也存在着一些缺点：①存在液体流动的阻力损失、油液的泄漏以及机械摩擦,故效率较低;②对控制工作温度要求较高;③由于工作液体的泄漏和可压缩性,液压系统的刚性较差使液压系统无法保证严格的传动比;④对工作液体的使用维护要求十分严格;⑤液压元件成本较高;⑥液压系统的故障判断和处理较难,要求工作人员技术水平和专业知识较高。其中工作液体的泄漏一直是不可避免的问题，其解决方法也是各行各业研究的重点之一。

　　泄漏形式

　　泄漏按流向可分为内泄漏和外泄漏。外泄漏主要是指液压油从系统泄漏到环境中，产生在液压系统的液压管路、液压阀、液压缸和液压泵(液压马达)的外部;内泄漏是指由于高低压侧的压力差的存在以及密封件失效等原因，使液压油在系统内部由高压侧流向低压侧，如液压传动中油液从高压腔向低压腔的泄漏;从换向阀内压力通道向回油通道的泄漏等。泄漏的主要形式有缝隙泄漏、多孔隙泄漏、粘附泄漏和动力泄漏等。

　　1.缝隙泄漏

　　工程机械液压系统的缝隙泄漏主要有两种,固定密封处(静接合面)泄漏和运动密封处(动结合面)泄漏。固定密封处泄漏的部位主要包括液压缸缸盖与缸筒的接合处等;运动密封处主要包括液压缸活塞与缸筒内壁、活塞杆与缸盖导向套之间。缝隙泄漏量的大小与压力差、间隙等因素有关。

　　2.多孔隙泄漏

　　液压元件中的各种盖板，由于表面粗糙度的影响，两表面之间不可能完全接触，在两表面不接触的微观凹陷处，形成许多截面形状多样、大小不等的空隙，空隙的截面尺寸与表面粗糙度有关。多空隙泄漏，液体需流经弯曲的众多空隙，在做密封性能试验时，需经一定的保压时间，泄漏才能显露出来。

　　3.粘附泄漏

　　粘性液体与固体臂之间有一定的粘附作用，二者接触后，在固体表面上粘附上薄薄的一层液体，若固体表面上的膜较厚时，油膜会因相互运动而被密封圈刮落产生粘附泄漏。防止粘附泄漏的基本办法是控制液体粘附层的厚度。

　　4.动力泄漏

　　在旋转轴的密封表面上，若留有螺旋加工的痕迹，当轴转动时，液体在转轴回转力的作用下沿螺旋痕迹的凹槽流动。若螺旋痕迹的方向与轴的转动方向一致时，由于螺旋痕迹的“泵油”作用，就会产生动力泄漏。动力泄漏的特点是轴的转速越高，泄漏量越大。防止动力泄漏，应避免在转轴的密封表面和密封圈的唇边上存在"泵油"作用的加工痕迹或利用动力泄漏的原理，利用螺旋痕迹的泵油作用，将泄漏油泵回，阻止泄漏。

北京华德液压全系列 具体型号及报价请联系客服

北京华德换向阀部分型号如下：

4WE6L61B/CG12NK4 4WEH10E20B/6EW220-50NEZ4

4WE6L61B/CG12NZ5 4WEH10E20B/6EW220-50NEZ5

4WE6L61B/CG12NZ5L 4WEH10E20B/6EW220-50NEZ5L

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4WE6L61B/CG24NZ5 4WEH10F20B/6EG24NETZ5

4WE6L61B/CG24NZ5L 4WEH10F20B/6EG24NETZ5L

4WE6L61B/CW220-50N9DKL 4WEH10F20B/6EG24NEZ4

4WE6L61B/CW220-50N9DL 4WEH10F20B/6EG24NEZ5

4WE6L61B/CW220-50N9Z5 4WEH10F20B/6EG24NEZ5L

4WE6L61B/CW220-50N9Z5L 4WEH10F20B/6EG24NTZ4

4WE6L61B/CW220-50NDKL 4WEH10F20B/6EG24NTZ5

4WE6L61B/CW220-50NDL 4WEH10F20B/6EG24NTZ5L

4WE6L61B/CW220-50NK4 4WEH10F20B/6EG24NZ4

4WE6L61B/CW220-50NZ5 4WEH10F20B/6EG24NZ5

4WE6L61B/CW220-50NZ5L 4WEH10F20B/6EG24NZ5L

4WE6M50B/AG24N         4WEH10F20B/6EW220-50NETZ4

4WE6M50B/AW220-50N 4WEH10F20B/6EW220-50NETZ5

4WE6M50B/BG24N         4WEH10F20B/6EW220-50NETZ5L

4WE6M50B/BW220-50N 4WEH10F20B/6EW220-50NEZ4

4WE6M61B/CG12N9DKL 4WEH10F20B/6EW220-50NEZ5

4WE6M61B/CG12N9DL 4WEH10F20B/6EW220-50NEZ5L

北京华德液压全系列 具体型号及报价请联系客服

北京华德换向阀部分型号如下：

4WE6M61B/CG12N9K4 4WEH10F20B/6EW220-50NTZ4

4WE6M61B/CG12NDKL 4WEH10F20B/6EW220-50NTZ5

4WE6M61B/CG12NDL 4WEH10F20B/6EW220-50NTZ5L

4WE6M61B/CG12NK4 4WEH10F20B/6EW220-50NZ4

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4WE6M61B/CG24NK4 4WEH10G20B/6AW220-50NEZ4

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4WE6M61B/CW220-50N9K4 4WEH10G20B/6AW220-50NTZ4

4WE6M61B/CW220-50N9Z5L 4WEH10G20B/6AW220-50NTZ5

4WE6M61B/CW220-50NDKL 4WEH10G20B/6AW220-50NTZ5L

4WE6M61B/CW220-50NDL 4WEH10G20B/6AW220-50NZ5

4WE6M61B/CW220-50NK4 4WEH10G20B/6AW220-50NZ5L

4WE6P50B/AG24N         4WEH10G20B/6EW220-50NETZ4

4WE6P50B/AW220-50N 4WEH10G20B/6EW220-50NETZ5

4WE6P50B/BG24N         4WEH10G20B/6EW220-50NETZ5L

4WE6P50B/BW220-50N 4WEH10G20B/6EW220-50NEZ4

4WE6P61B/CG12N9DKL 4WEH10G20B/6EW220-50NEZ5

4WE6P61B/CG12N9DL 4WEH10G20B/6EW220-50NEZ5L

4WE6P61B/CG12N9K4 4WEH10G20B/6EW220-50NTZ4

4WE6P61B/CG12N9Z4 4WEH10G20B/6EW220-50NTZ5

4WE6P61B/CG12N9Z5 4WEH10G20B/6EW220-50NTZ5L

北京华德液压全系列 具体型号及报价请联系客服

北京华德换向阀部分型号如下：

4WE6P61B/CG12N9Z5L 4WEH10G20B/6EW220-50NZ4

4WE6P61B/CG12NDKL 4WEH10G20B/6EW220-50NZ5

4WE6P61B/CG12NDL 4WEH10G20B/6EW220-50NZ5L

4WE6P61B/CG12NK4 4WEH10H20B/6EG24NETZ4

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4WE6P61B/CG12NZ5 4WEH10H20B/6EG24NETZ5L

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4WE6P61B/CG24N9DKL 4WEH10H20B/6EG24NEZ5

4WE6P61B/CG24N9DL 4WEH10H20B/6EG24NEZ5L

4WE6P61B/CG24N9K4 4WEH10H20B/6EG24NTZ4

4WE6P61B/CG24N9Z4 4WEH10H20B/6EG24NTZ5

4WE6P61B/CG24N9Z5 4WEH10H20B/6EG24NTZ5L

4WE6P61B/CG24N9Z5L 4WEH10H20B/6EG24NZ4

4WE6P61B/CG24NDKL 4WEH10H20B/6EG24NZ5

4WE6P61B/CG24NDL 4WEH10H20B/6EG24NZ5L

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4WE6P61B/CG24NZ5 4WEH10H20B/6EW220-50NETZ5L

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4WE6P61B/CW220-50N9DKL 4WEH10H20B/6EW220-50NEZ5

4WE6P61B/CW220-50N9DL 4WEH10H20B/6EW220-50NEZ5L

4WE6P61B/CW220-50N9K4 4WEH10H20B/6EW220-50NTZ4

4WE6P61B/CW220-50N9Z4 4WEH10H20B/6EW220-50NTZ5

4WE6P61B/CW220-50N9Z5 4WEH10H20B/6EW220-50NTZ5L

4WE6P61B/CW220-50N9Z5L 4WEH10H20B/6EW220-50NZ4

4WE6P61B/CW220-50NDKL 4WEH10H20B/6EW220-50NZ5

4WE6P61B/CW220-50NDL 4WEH10H20B/6EW220-50NZ5L

北京华德液压全系列 具体型号及报价请联系客服

北京华德换向阀部分型号如下：

4WE6P61B/CW220-50NK4 4WEH10J20B/6EG24NETZ4

4WE6P61B/CW220-50NZ4 4WEH10J20B/6EG24NETZ5

4WE6P61B/CW220-50NZ5 4WEH10J20B/6EG24NETZ5L

4WE6P61B/CW220-50NZ5L 4WEH10J20B/6EG24NEZ4

4WE6Q61B/CG12N9DKL 4WEH10J20B/6EG24NEZ5

4WE6Q61B/CG12N9DL 4WEH10J20B/6EG24NEZ5L

4WE6Q61B/CG12N9K4 4WEH10J20B/6EG24NTZ4

4WE6Q61B/CG12N9Z4 4WEH10J20B/6EG24NTZ5

4WE6Q61B/CG12N9Z5 4WEH10J20B/6EG24NTZ5L

4WE6Q61B/CG12N9Z5L 4WEH10J20B/6EG24NZ4

4WE6Q61B/CG12NDKL 4WEH10J20B/6EG24NZ5

4WE6Q61B/CG12NDL 4WEH10J20B/6EG24NZ5L

4WE6Q61B/CG12NK4 4WEH10K20B/6AG24NETZ4

4WE6Q61B/CG12NZ4 4WEH10K20B/6AG24NETZ5

4WE6Q61B/CG12NZ5 4WEH10K20B/6AG24NETZ5L

4WE6Q61B/CG12NZ5L 4WEH10K20B/6AG24NEZ4

4WE6Q61B/CG24N9DKL 4WEH10K20B/6AG24NEZ5

4WE6Q61B/CG24N9DL 4WEH10K20B/6AG24NEZ5L

4WE6Q61B/CG24N9K4 4WEH10K20B/6AG24NTZ4

4WE6Q61B/CG24N9Z4 4WEH10K20B/6AG24NTZ5

4WE6Q61B/CG24N9Z5 4WEH10K20B/6AG24NTZ5L

4WE6Q61B/CG24N9Z5L 4WEH10K20B/6AG24NZ4

4WE6Q61B/CG24NDKL 4WEH10K20B/6AG24NZ5

4WE6Q61B/CG24NDL 4WEH10K20B/6AG24NZ5L

北京华德液压全系列 具体型号及报价请联系客服

北京华德换向阀部分型号如下：

4WE6Q61B/CG24NK4 4WEH10K20B/O6EW220-50NETZ4

4WE6Q61B/CG24NZ4 4WEH10K20B/O6EW220-50NETZ5

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4WE6Q61B/CW220-50N9K4 4WEH10K20B/O6EW220-50NTZ4

4WE6Q61B/CW220-50N9Z4 4WEH10K20B/O6EW220-50NTZ5

4WE6Q61B/CW220-50N9Z5 4WEH10K20B/O6EW220-50NTZ5L

4WE6Q61B/CW220-50N9Z5L 4WEH10K20B/O6EW220-50NZ4

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4WE6Q61B/CW220-50NZ5L 4WEH10K20B/OF6AW220-50NEZ4

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