离心式水泵由于流量连续均匀，构造简单，转速高，易于直接与电机配套使用等一系列优点，因而被广泛采用。 但由于离心泵无自吸能力，工作时靠蜗壳内叶轮的高速旋转，产生所谓的“真空低压区”来完成吸、排作用，故每次启动前都需事先向泵内灌满水，以排除泵壳与吸水管内的空气 Centrifugal pumps due to continuous flow uniform, simple structure, high speed, easy and direct use with the motor and a series of advantages, which are widely used. However, due to the centrifugal pump without self-suction capacity, work by the high-speed rotation of the impeller within the volute, resulting in the so-called “vacuum low pressure zone” to complete the suction and discharge role, it must be prior to each start to the pump filled with water, To exclude the pump housing and suction pipe air