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一、概述离心水泵起动前需排气引水。一般方法是人工灌水、真空泵或水射器抽真空引水、提高清水池水位使水泵永远处于充水状态等。在小型给水系统中,例如较高层的宿舍,给水泵的开停多采用自动控制。但由于自控引水过程比较复杂而且往往受各种因素的影响,最后不得不停止使用。若把清水池建在地面上,在某些场合又不允许;清水池深埋地下又往往不能自行排空,底阀出了故障,检修十分困难,如采用水上式底阀,又要求有很长的吸水管,使泵房与水地之间的平面布置带来困难。
First, an overview Centrifugal pumps need to exhaust before starting water. The general method is artificial irrigation, vacuum pump or ejector vacuum water diversion, improve the water level in the pool so that the pump is always in the water filled state. In small-scale water supply systems, such as higher-level dorm rooms, automatic control of the pump on and off is often used. However, because of the complicated process of pilot water diversion and often influenced by various factors, it has to be stopped. If the clear water is built on the ground, in some occasions they are not allowed; deep underground often can not empty itself, the bottom valve out of trouble, overhaul is very difficult, such as the use of water-based foot valve, but also requires a Long suction pipe, the pump room and the ground between the layout of the difficulties.