The reasons why the flow rate of the mine-used high-pressure water pump fails to meet the requirements may involve multiple aspects. A comprehensive investigation needs to be conducted by taking into account the equipment itself, the operating environment, and the system design.
1. Malfunction or wear of mechanical components
Impeller damage or blockage
Reason: The impeller is worn, deformed, or clogged with slurry, sand and other impurities, resulting in a decrease in energy transmission efficiency.
Solution: Remove the pump and inspect the impeller, clean the blockage; if the wear is severe, it needs to be replaced, and the inlet end filtration device should be strengthened (such as installing a protective net or cleaning the filter regularly).
Sealing components aging or leakage
Reason: After the sealing rings, bearings and other components wear out, internal leakage occurs, reducing the effective flow rate by 46%.
Solution: Replace the sealing components or worn parts, check if the pump body connection is tightened to avoid efficiency loss due to leakage.
II. Insufficient water intake conditions
Insufficient inlet pressure or excessive suction height
Reason: The water level of the source drops, the suction pipe is too long or the pipe diameter is too small, resulting in excessive suction resistance and even cavitation.
Solution: Increase the diameter of the inlet pipe, shorten the length of the suction pipe, or adjust the installation height of the pump to a reasonable suction height range (usually not exceeding 90% of the pump's rated suction height).
Air enters the pump body or pipeline.
Reason: The suction pipeline is not sealed properly (such as aging gaskets, loose bolts), or the pump was not fully evacuated during startup, resulting in gas accumulation inside the pump.
Solution: Check and repair the leakage points, and exhaust all the air in the pump through the exhaust valve before startup; regularly maintain the sealing performance of the pipeline.
III. Issues Related to Pipeline and System Design
Pipeline blockage or excessive resistance along the route
Reason: Mineral impurities have accumulated in the water pipe, the valves are not fully opened, or there are too many pipe bends, resulting in an increase in water head loss.
Solution: Clean the pipeline and valves, optimize the layout to reduce bends; if the pipeline is too long, a larger diameter pipe can be replaced to reduce friction loss.
The pump selection does not match the operating conditions.
Reason: The designed head or flow rate did not take into account the actual operating conditions (such as the depth of the mine, the solid content of the water quality), resulting in overloading or low efficiency.
Solution: Re-evaluate the system requirements and select an appropriate high-pressure pump model; if necessary, add multiple-stage pumps or adjust the impeller configuration.
IV. Abnormal Operating Parameters
Insufficient motor power or low rotational speed
Reason: Unstable power supply voltage, motor aging, slipping of the belt (for non-directly connected pumps), resulting in insufficient rotational speed and affecting the flow rate.
Solution: Check the voltage stability, adjust the motor speed to the rated value; replace the damaged transmission components (such as belts, couplings).
Improper valve opening or load regulation
Reason: The outlet valve opening is insufficient or the control system fails to respond promptly to load changes, thereby limiting the flow output.
Solution: Check the opening and closing status of the valve and the actuator, and optimize the control system parameters (such as PID regulation).
V. Other Environmental Factors
Water quality issue
Cause: High concentration of minerals or particles in the water leads to corrosion of the impeller, scaling of the pipes, or clogging of the filters.
Solution: Install water treatment devices (such as water softening equipment, sedimentation tanks), and regularly clean the scale inside the pump.
The pump is aging or has not been maintained for a long time.
Reason: Mechanical problems such as rusted bearings and bent pump shafts gradually accumulate, resulting in a decline in overall performance.
Solution: Develop a regular maintenance plan (such as lubricating the bearings and correcting the pump shaft), and replace components with extended service life.
When conducting the investigation, follow the principle of "start with the easier tasks and then move on to the more difficult ones":
Check external factors: such as valve status, pipeline integrity, and power stability;
Test mechanical performance: disassemble and inspect the impeller and seals, measure the motor speed and voltage;
Verify system design: confirm whether the pump selection is compatible with the actual working conditions, and recalculate the pipeline characteristic curve if necessary.
