(1) Increase the maximum circumferential velocity at the impeller outlet and the width of the impeller blade outlet. The maximum circumferential velocity at the impeller outlet can be achieved by directly increasing the impeller speed by increasing the impeller. However, excessive guarantees that increasing the maximum circumferential velocity at the impeller outlet and the width of the impeller blade outlet will change the basic performance parameters of the pump, such as flow rate and head. Therefore, it is necessary to appropriately increase the maximum circumferential speed of the impeller outlet and the outlet width of the impeller blades on the premise that the flow rate and head of the pump meet the usage requirements.
(2) The relationship between water storage capacity and self suction performance: When the water storage capacity increases, the self suction height of the pump significantly increases, but when the water output is too large, it will slow down the gas discharge process, which will increase the self suction time. Therefore, when the self suction height requirement is high but the self suction time requirement is not too strict, the water storage capacity of the pump can be increased, that is, the volume of the storage chamber can be increased. However, when the self suction time requirement is strict, the size of the storage chamber should be reasonably determined.
(3) The relationship between reflux hole area, self suction time, and self suction height: Within the critical reflux hole area, as the reflux hole area increases, the self suction time decreases, and the self suction height decreases accordingly. Therefore, when the self suction time requirement is strict and the self suction height requirement is not high, the area of the reflux hole can be appropriately increased. Conversely, the area of the reflux hole should be appropriately reduced.
(4) Setting up a gas-liquid separation acceleration device can accelerate gas-liquid separation, which can shorten the self suction time. The simplest gas-liquid separation acceleration device is to add a baffle in the gas-liquid separation chamber. As shown in Figure 1. Adding baffles in the gas-liquid separation chamber has almost no effect on the self suction height. So, as long as the structure allows, baffles should be installed in the gas-liquid separation chamber to accelerate gas-liquid separation and shorten the self suction time.