Deep-well pump control method and deep-well pump control device

Abstract

A deep-well pump control method and a deep-well pump control device are disclosed. The deep-well pump control method comprises the steps of controlling a motor of a deep-well pump to operate at a rated rotating speed and obtaining torque current and output power of the motor, and if the torque current of the motor is less than a predetermined torque current lower limit and the output power of themotor is less than a predetermined first power threshold, controlling the motor to operate; if yes, controlling the motor to be stopped, otherwise, judging whether the output power of the motor is smaller than a preset second power threshold value Pmin2 or not, if not, executing the previous step again, if yes, executing the next step, and recording the outlet pressure of the deep-well pump to serve as a pressure threshold value; reducing the rotating speed of the motor, obtaining an outlet pressure change value of the deep-well pump, and judging whether the deep-well pump leaks or not according to the outlet pressure change value. Water-free protection of the deep water pump can be automatically achieved, the pressure threshold value generated when the deep water pump is shut down is automatically recognized, and whether the deep water pump leaks or not is detected.

Description

technical field [0001] The invention relates to deep well pump control technology. Background technique [0002] The deep well pump motor adopts a high-speed permanent magnet motor, which can reduce the number and volume of impellers in the pump body, and reduce the cost and volume of the pump. This has become the development trend of the deep well pump industry. The drive, motor and impeller of the deep well pump are directly connected and sealed, and work in a closed deep well. Since the depth of the deep well reaches more than 100 meters, once the deep well pump breaks down and stops working normally, it is not only difficult to maintain, but also the maintenance cost is very high. This requires the deep well pump driver to have a certain degree of intelligence, not only to be able to identify a variety of faults, but also to be able to deal with them accordingly. [0003] The existing deep well pump drivers can deal with some simple faults, but there is no good solutio...

AI Technical Summary

Problems solved by technology

[0004] 1) When the silt in the deep well blocks the impeller, it will cause the motor to stall, making the pump unable to start normally;

[0005] 2) When the water level in the deep well is low, the motor and driver are exposed to the air, unable to dissipate heat through water cooling, and are easily damaged by overheating;

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