This is one of the most commonly used submersible pumps on the market; it is capable of achieving high discharge heads that are difficult for standard submersible pumps to reach, making it suitable for deep wells hundreds of meters deep. However, as many users lack specialized technical knowledge, they may not always follow all operational guidelines; improper use or failure to observe precautions can easily damage the pump or, at the very least, shorten its service life. Today, Shanghai Shenyin Pump Manufacturing Co., Ltd.—a manufacturer of deep-well pumps—will explain the key precautions for operating these pumps. Before a deep-well submersible pump begins operation, the pump casing must be filled with liquid. Once started, the impeller rotates at high speed, causing the liquid inside to rotate along with the blades; driven by centrifugal force, the liquid is flung outward from the impeller. As the ejected liquid enters the diffusion chamber of the pump casing, its velocity decreases while its pressure rises, eventually discharging through the pump outlet and discharge pipe. Meanwhile, the displacement of liquid creates a low-pressure vacuum zone (devoid of both air and liquid) at the center of the impeller; atmospheric pressure acting on the surface of the liquid source then forces liquid through the suction pipe and into the pump. This process ensures a continuous cycle of drawing liquid from the source and discharging it through the outlet pipe.
The following points detail the precautions for use:
1. Before operating the electric pump, use a megohmmeter to check the motor's insulation resistance; the value must not be lower than 5 megohms. To perform this check, connect one terminal of the megohmmeter to the pump's power cable and the other to the motor housing, then crank the megohmmeter and observe the insulation resistance reading.
2. For water-filled motors, open the filling plug, fill the unit completely with clean water, tighten the plug, and then submerge it. For oil-filled motors, if an oil leak is detected, replace the sealing components before submerging the unit.
3. Do not pull on the power cable when submerging or lifting the electric pump, as this could damage the cable or cause the connection to break.
4. The electric pump must be submerged in a vertical position; do not place it at an angle.
5. The electric pump must not be used to transport water with high sand content or mud/slurry. For water-filled motors, sand particles inside the motor chamber should be cleaned out regularly, and the clean water within the chamber should be replaced.
6. After use, the electric pump should be thoroughly cleaned; apply oil to metal surfaces to prevent rust, and store the unit upright in a dry location.
Through the detailed analysis of the six points above, we have gained insight into the pre-operation preparations, actual operating conditions, and post-operation procedures for deep-well submersible pumps. While submersible pump technology has matured over years of development, the product must evolve further to keep pace with the rapid tempo of today's society amidst fierce market competition.
Precautions for using deep-well pumps