When using centrifugal impurity pump, first determine the purpose and performance parameters of centrifugal impurity pump and select the pump type. Let's analyze some daily use methods of centrifugal impurity pump, as well as matters needing attention and functional models when selecting multi-stage centrifugal pump. The second is the daily maintenance of multi-stage centrifugal pump:
1. Make the model and performance of the selected multistage centrifugal pump meet the requirements of process parameters such as flow, head, pressure, temperature, NPSH, suction head and so on.
2. Multistage centrifugal pump must meet the requirements of medium characteristics.
(1) For pumps conveying flammable, explosive, toxic or valuable media, reliable shaft seal or leak free pump is required, such as magnetic pump (isolated magnetic indirect drive without shaft seal);
(2) For multi-stage pumps conveying corrosive media, convection components are required to adopt corrosion-resistant materials, such as fluoroplastic corrosion-resistant pumps;
(3) For multistage centrifugal pump conveying medium containing solid particles, the convection parts are required to be made of wear-resistant materials, and the shaft seal shall be washed with clean liquid when necessary.
When the multi-stage centrifugal pump is started, the (front) pressure water flows to the upper chamber of the piston in the cylinder through the solenoid valve with time delay, and the lower chamber of the piston flows to the atmosphere through the lower end of the cylinder through the solenoid valve. At this time, the control valve is closed.
After the motor compensation is started, the multi-stage centrifugal pump operates normally. The solenoid valve executes the reversing command to cut off the pressure water source in the upper chamber of the piston and close the circuit from the lower end of the cylinder to the atmosphere. At the same time, the pressure water is injected into the lower chamber of the piston in the cylinder through the solenoid valve, and the circuit from the upper chamber of the piston to the atmosphere is opened. The water in the upper chamber of the piston is discharged out of the valve through the solenoid valve, and the control valve is opened slowly at the set speed, Complete and meet the starting characteristics of centrifugal pump with low shaft power at zero flow, and ensure the safe operation of water pump unit.
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