DB10-2-52/315V

DB10-2-52/315V REXROTH先导式溢流阀，武汉百士自动化设备有限公司供应产品，现货库存，原厂原装，质量保障，价格优惠；移动电话：15307180902，商务QQ：980227448，传真：027-87680708-608，联系人：雷青；欢迎新老客户咨询购买！

液压阀的作用:控制液流的压力、流量和方向，保证执行元件按照要求进行工作。

2、液压阀的基本结构:包括阀芯、阀体和驱动阀芯在阀体内作相对运动的装置。

3、液压阀的工作原理:利用阀芯在阀体内作相对运动来控制阀口的通断及阀口的大小，实现压力、流量和方向的控制。

液压阀的分类:

1根据结构形式分类

滑阀：滑阀为间隙密封，阀芯与阀口存在一定的密封长度，因此滑阀运动存在一个死区。

锥阀：锥阀阀芯半锥角一 般为12°-20°，阀口关闭时为线密封，密封性能好且动作灵敏。

球阀：性能与锥阀相同

2.根据控制制方式不同分:

定值或开关控制阀:被控制量为定值的阀类，包括普通控制阀、插装阀、叠加阀。

比例控制阀:被控制量与输入信号成比例连续变化的阀类，包括普通比例阀和带内反馈的电液比例阀。

伺服控制阀:被控制量与(输出与输入之间的)偏差信号成比例连续变化的阀类，包括机液伺服阀和电液伺服阀。.

数字控制阀:用数字信息直接控制阀口的启闭，来控制液流的压力、流

量、方向的阀类。

3.根据用途分:

压力控制阀、流量控制阀、方向控制阀

方向控制阀的作用:在液压系统中控制液流方向。

方向控制阀包括:单向阀和换向阀

单向阀包括:普通单向阀和液控单向阀

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机械能:

对于刚体来说，机械能是其动能和势能的总和;对于流体来说，机械能是其压力能、动能和势能的总和。

压力能:

伯努利方程表明，流体中与压力相关的那部分能量叫作压力能。显然，流体的压力能等于其压力和体积的乘积。在液压与气压传动中，压力能是主要的能量形式，势能和动能比压力能小得多。

动力元件是指液压系统的液压泵和气压系统的气源装置。它们由电动机或柴油机驱动，把输入的机械能转换成油液或气体的压力能输入到系统中去，为系统的工作提供动力。

一、液压泵的基本工作原理

单柱塞泵的工作原理。凸轮由电动机带动旋转。当凸轮推动柱塞向上运动时，柱塞和缸体形成的密封体积减小，油液从密封体积中挤出，经单向阀排到需要的地方去。当凸轮旋转至曲线的下降部位时，弹簧迫使柱塞向回下，形成一定真空度，油箱中的油液在大气压力的

作用下进入密封容积。凸轮使柱塞不断地升降，密封容积周期性地减小和增大，泵就不断吸油和排油。

容积式液压泵的共同工作原理如下:

(1)容积式泵必定有一一个或若干个周期变化的密封容积。密封容积变小使油液被挤出，密封容积变大时形成一定真空度，油液通过吸油管被吸入。密封容积的变换量以及变化频率决定泵的流量。

( 2)合适的配流装置。不同形式泵的配流装置虽然结构形式不同，但所起作用相同，并且在容积式泵中是必不可少的。容积式泵排油的压力决定于排油管道中油液所受到的负载。