自制离心泵无底阀结构图1。泵开启前,排气阀和外界相通,当P_1=P_0时,此时容器内液面到达进水管顶端A面,关掉排气阀,此时容器处于密闭状态,当泵起动后,容器内的液体经泵向外排出,容器内液面下降。在外界压强P_0的作用 Self-made centrifugal pump without bottom valve structure Before the pump is turned on, the exhaust valve is connected with the outside world. When P_1 = P_0, the liquid level in the container reaches the top A side of the inlet pipe and the exhaust valve is closed. At this time, the container is in the closed state. When the pump is started, Of the liquid discharged to the outside through the pump, the liquid level down the container. The role of pressure in the outside world P_0