止逆的

The results show that a separate dunk is observed near the stagnation point of the second sphere on the distance of spheres L≤2.5D because of the influence of reverse pressure gradient.

结果表明：当L≤2.5D时，由于逆压梯度的影响，在第二个圆球滞止点附近捕捉到附体分离泡；由于第二个与第三个圆球的置入，展向压力梯度诱发第一个圆球背风面流动的展向输运，且随着圆球间距的增加流场的展向输运趋势减小，但涡的强度增大；第二个圆球与第三个圆球背风面流动没有明显的展向输运；湍动能的增量与圆球间距近似成平方规律。

Analyzing the calculating process of belt conveyor with high angle theoretically, starting from its theoretic calculate the cross sectional area of materials and peripheral force, shaft power of drum, power of motor, using point by point method to get the resultant strain of every drum and torsion of driving drum, calculating the maximum strain and the maximum reverse stopping torque, to give the support on theory for using belt conveyor with super-long distance, high angle under the coal mine.

本文针对长运距、大倾角、高强度带式输送机设计过程中存在的问题，从四个方面对大倾角带式输送机进行分析研究：从理论上解析大倾角带式输送机的计算过程，从大倾角带式输送机的理论入手，详细计算物料的横截面面积、圆周力、滚筒轴功率和电机功率，利用逐点计算法计算各个滚筒的合张力以及传动滚筒的扭距，计算出胶带的最大张力和最大逆止力矩，给长运距、大倾角皮带机在煤矿井下的使用给予理论上的支持。

It pumps the same volume of work and the general principles, Shaft is a concerted installed in the pump body in a position eccentric rotor component, Journal of the three rotor blade will pump cavity divided into three studios, since gas was pumped into the suction mouth. break through strainer into the pump room and check valve, rotor, The studio itself complete with suction inlet isolation rooms will pump gas compression and access to the box and exhaust gas emissions.

它的工作原理与一般容积泵相同，是由一个与传动轴同心安装而在泵体内处于偏心位置的转子组成，转子上有三个径向滑动的叶片，将泵腔分隔成三个工作室，被抽气体自吸气口进入，通过打开的逆止阀与过滤网进入泵室，当转子旋转时，完成吸气的工作室自行与进气口隔离并将气体压缩和通过泵室与排气箱之间的通路将气体排出。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。