变速泵实现输液管路末端(或定点)恒压控制的理论推算方法

A Control Calculation Method of Variable Speed Pumps for Keeping the Pressure at Piping's Exit (or any Point) Constant

在输液管路末端（或某一定点）有一定压力要求的流体动力系统中，以末端（或某一定点）恒压为条件进行泵的工作转速控制是一种最为经济的系统运行方式．但在长距离管道上直接以末端压力作为恒压控制的反馈信号，往往有很大的工程难度．该文提出了两种用始端压力作为反馈信号而实现这种运行方式的流体动力理论推算方法和相应的控制方案．

It would be most economical for operation if,in a fluid flow system,where it is desired to keep the pressure constant at the exit (or any point), to regulate the pump's speed accordingly. But serious difficulties may be encountered if,in long pipe lines,the exit pressure is directly used as the feed backsignal. The paper suggest two ways of using the entry pressure as the feed back signal,and simultaneouly presents an hydrodynamic calculation method and the relevant way of effectuating the control.