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油液在系统中流动时,油液与管壁的摩擦、各段管道截面积的变化、以及流向的改变等,都是对油液产生阻力的主要原因。 过大的流阻导致各种不良的后果。例如管道的截面积过小,以致管道与油液的摩擦加剧,由于摩擦力过大而发热,使油液的粘度下降,导致油液泄漏,并从而引起油液压力下降。在有的场合下,由于流阻过大,使油液流速受到限制,执行部件的工作循环时间延长,并降低了有效功率。在一定的场合下,由于管道形状大小和方向的不断变化,使油液产生紊流,流动不畅通,甚至发生反复冲击形成震荡回路而产生噪音和振动,这对于各种液压件的寿命是一个不利因素。因此,液压流阻的大小,在液压传动中是不可忽视的一个方面。
Oil flow in the system, the friction between the oil and the pipe wall, section of the pipeline cross-sectional area changes, as well as changes in flow direction, are the main causes of resistance to oil. Excessive flow resistance leads to a variety of undesirable consequences. For example, the cross-sectional area of the pipe is too small, so that the friction between the pipe and the oil is aggravated. As the friction is too large, the viscosity of the oil drops, causing the oil to leak and thus causing the oil pressure to drop. In some cases, due to the large flow resistance, the oil flow rate is limited, the working part of the working cycle time is extended, and reduce the effective power. Under certain circumstances, due to the continuous changes in the size and direction of the pipe shape, turbulent flow and unblocked flow of oil can occur, and even repeated shocks can cause noise and vibration in the shock circuit, which is a life expectancy of various hydraulic components Unfavorable factors Therefore, the size of the hydraulic flow resistance in the hydraulic drive is an aspect that can not be ignored.