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一、前言使用离心泵时,为了启动方便、简化操作,常在吸水管道下端装一底阀,以代水泵灌水之劳。底阀是装在水泵吸水管道下端的一种止回阀。在底阀关闭的情况下,把水灌入泵壳和吸水管内,排净空气后启动水泵,可达到水泵连续工作的目的。但是,底阀引水有以下缺点: 1.底阀有局部阻力,造成水泵功率损失; 2.底阀易于损坏,水泵利用率低。在水泵启动和运行时,底阀经常处于活动状态,极易磨损,形成磨损间隙,间隙的增大,使底阀漏水失去了止回作用,造成
I. Introduction When using centrifugal pump, in order to start convenient, simplify operation, often at the bottom of a suction pipe fitted with a valve at the bottom, to replace the water pump labor. The bottom valve is a check valve installed at the bottom of the pump suction pipe. In the case of the end of the valve is closed, the water poured into the pump housing and suction pipe, after the net air purifier to start the pump, pump can achieve the purpose of continuous work. However, the bottom valve water diversion has the following disadvantages: 1. The bottom valve has local resistance, resulting in loss of pump power; 2. The bottom valve is easy to damage and the pump utilization is low. When the pump starts and runs, the bottom valve is often in an active state, which is easy to wear and form a wear gap. The increase of the clearance increases the leakage of the bottom valve and prevents it from being lost.