Fault one: the water output is small after the water pump starts
Cause analysis and troubleshooting:
- The suction pipe is not tight and the air intake, the water appears milky bubbles
Exclusion method: check the suction pipe, plug the leak
- The rotation direction of the water pump is wrong
Remedy: Change the motor power wiring, switch any two of the three wires and start.
- Insufficient valve opening
Remedy: Check the valve switch position and open the valve after finding out the cause.
- Pump speed is not enough
Remedy: Check whether the power supply voltage is too low; the speed control pump should increase the speed and increase the water head.
- Insufficient pump head
Exclusion method: the pump with a higher head should be replaced
- Flowmeter failure
Remedy: recalibrate flow or repair or replace.
- Foreign body is blocked in the suction pipe or impeller flow path
Remedy: Stop disassembling inspection after judging and excluding other possible causes.
Fault two, pump vibration and noise
Cause analysis and troubleshooting:
- Loose fixing bolts of motor and water pump feet
Remedy: readjust and tighten loose bolts.
- Pumps and motors are not concentric
Remedy: readjust the concentricity of the pump and motor.
- Severe cavitation of water pump
Exclusion method: reduce the amount of water output, or increase the water level of the suction tank or suction well, reduce the height of the vacuum suction, or replace the pump with a higher vacuum.
- Bearing damage
Remedy: Replace with new bearing.
- Bent or worn pump shaft
Remedy: Repair pump shaft or replace with new bearing.
- Imbalance of water pump impeller or motor rotor
Exclusion method: disintegration check, static and dynamic imbalance test if necessary, this work can only be performed when other reasons are excluded.
- Pump in Sundries
Remedy: Open the pump cover and check for obstructions.
- Coupling inner column bolt or rubber column is worn or damaged
Remedy: Check the inner column of the coupling and repair or replace it if necessary.
- The flow is too large or too small, away from the allowable operating point of the pump
Exclusion method: adjust and control the water output or update and transform the equipment to meet the needs of the actual working conditions.
Failure three, bearing overheating
Cause analysis and troubleshooting:
- Sliding bearing oil ring rotates slowly with little oil or low oil level
Remedy: Check the oil level, observe the oil ring transmission speed, and repair or replace the oil ring.
- Insufficient cooling water supply in the fuel tank
Remedy: Check the cooling water pipe and the joint door. If there is a blockage, remove it.
- Water in the fuel tank destroys the lubricant film
Remedy: Check the cooling water pipe and fuel tank seal in the fuel tank, resolve leaks, and replace with new oil.
- Lubricant grade does not meet original design requirements or oil is dirty
Exclusion method: Use lubricating oil according to the instructions, check the oil quality regularly, always use the same brand of lubricating oil when replenishing the oil, and periodically replace with new oil.
- Shaft and inner ring of rolling bearing loosen and cause friction
Remedy: Repair shaft diameter or replace with new pump shaft and bearing..
Failure four, the cause of the heating in the stuffing room and the elimination method
Cause analysis and troubleshooting:
- The packing gland is pressed too tightly
Remedy: adjust the seasoning gland bolts so that they are properly tightened
- Sealed cooling water pipe section door is not opened or opened insufficiently
Exclusion method: Open the cooling water pipe section door and control the water in the filling chamber to drip continuously, preferably 30 to 60 drops per minute.
- Improper replacement of packing causes displacement of the water seal and blocks the water holes
Remedy: Stop and readjust the position of the water seal ring so that its water inlet is aligned with the cooling water injection hole.
- No water from pump, no cooling water lubrication
Remedy: Stop the machine and restart it according to the operating requirements.