喷泉泵止回阀的作用

The Function of Fountain Pump Check Valve

一、防止回流

I. Preventing reflux

如果不使用单向阀或者单向阀有故障时，水泵停止时在水井竖管中的水就会产生回流。这种回流会反向推动转子，同时在潜水电机止推轴承上保持微小的推力，直到转子停止转动，这会导致电机止推轴承过多磨损，降低电机使用寿命。

If the one-way valve is not used or if the one-way valve fails, the water in the shaft pipe will return when the pump stops. This kind of recirculation will push the rotor backwards, while maintaining a small thrust on the thrust bearing of the submersible motor until the rotor stops rotating, which will lead to excessive wear and tear of the thrust bearing of the motor and reduce the service life of the motor.

二、防止上止推力的产生

2. Preventing the generation of upper stop thrust

如果不使用单向阀或者单向阀泄露，每次水泵的启动都没有水压头。许多水泵在低压头情况下竭尽全力的向上推动叶轮会向上拉动转子。重复这种上推力会导致水泵电机故障，除非水泵的结构能够防止转轴的移动。

If no one-way valve or one-way valve is used to leak, there is no water head for each pump start-up. Many pumps try their best to push the impeller upward under the condition of low pressure head, which will pull the rotor upward. Repetition of this upward thrust will cause pump motor failure unless the pump structure prevents the rotation shaft from moving.

三、防止水锤的产生

3. Prevention of Water Hammer

如果未使用单向阀，水泵停止时水柱的重力作用会形成水击。这种水击会通过输送管击裂管道，破坏叶轮，对电机和水泵的止推轴承造成损伤。

If the one-way valve is not used, the gravity of the water column will cause water hammer when the pump stops. This kind of water hammer will crack the pipeline through the conveyor pipe, destroy the impeller, and cause damage to the thrust bearing of the motor and pump.