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Handling of common faults in pumps

Views:6     Author:Site Editor     Publish Time: 2019-06-24      Origin:Site

First, the pump can not be launched

First of all, you should check the power supply: whether the connector is secure; whether the switch is tight; whether the fuse is blown; whether the three-phase power supply is equal. If there is a disconnection, poor contact, fuse blown, lack of phase, the cause should be identified and repaired in time.

Secondly, check whether it is the mechanical problem of the pump itself. The common reasons are: the packing is too tight or the impeller and the pump body are stuck by the debris; the pump shaft, the bearing and the leak-reducing ring are rusted; the pump shaft is severely tortuous.

Sweeping method: loosen the packing, dredge the water tank; disassemble the pump body to remove debris and rust; remove the pump shaft to correct or replace the new pump shaft.

Second, there are four reasons for the overheating of the supporting power motor.

1. The reason for the power supply: the slurry pump voltage is high or low. Under certain load, if the voltage variation scale should be +10% to -5% of the additional value, the motor will overheat;

The three-phase voltage of the power supply is asymmetrical, and the phase imbalance of the three-phase voltage of the power supply exceeds 5%, which will lead to overheating of the winding; the phase loss operation, which indicates that more than 85% of the agricultural motor is burned is due to the lack of phase operation, and the motor device is lacking. Phase maintenance device.

2, is the reason for the pump: the selection of power is not matched, the small horse-drawn carriage, the motor is overloaded for a long time, so that the motor temperature is too high; the motor is too frequent, the quota is short or intermittent work, the motor works in succession. The number of launches should be limited, and the thermal maintenance should be properly selected and applied according to the calibration quota on the motor.

3, is the reason of the motor itself: the fault is wrong, the △ shape is mistakenly connected to the Y shape, so that the temperature of the motor rises rapidly; the stator winding has phase-to-phase short circuit, turn-to-turn short circuit or partial grounding, and the motor is partially overheated when it is light, when severe Insulation burnt out; squirrel cage rotor broken strips or shortcomings, motor running for 1 to 2 hours, core temperature rises rapidly; ventilation system problems, should check whether the fan is damaged, the direction of rotation is correct, whether the ventilating channel of the slurry pump is blocked; The wear of the bearing and the bounce of the rotor are so that the iron of the stator and rotor is rubbed to announce the sound of metal impact. The temperature of the iron core rises rapidly. When the motor is severe, the motor smokes and even the coil burns.we are slurry pump manufacturer and gravel pump for sale,you can know it.

The fourth is the working environment: the motor windings are damp, dust, oil, etc. are attached to the windings, resulting in lower insulation. The insulation resistance of the motor should be measured and cleaned and dried; the ambient temperature is too high.

When the ambient temperature exceeds 35 ° C, the inlet air temperature is high, the temperature of the motor will be too high, and efforts should be made to improve the working environment. Such as scaffolding and so on. Note: Due to electrical problems, you should be repaired by an electrician who has obtained a professional qualification certificate. Those who know nothing about it should not be blindly repaired to prevent the onset of personal injury.

Third, the pump heat

Cause: Bearing damage; slurry pump rolling bearing or bracket cover clearance is too small; pump shaft is twisted or two shafts are not concentric; tape is too tight; oil or oil is not good; balance hole on impeller is blocked, impeller loses balance, increase Big thrust to one side.

Sweeping method: replace the bearing; remove the back cover, install a gasket between the bracket and the bearing seat; query the pump shaft or adjust the concentricity of the two shafts; properly adjust the tightness of the tape; add clean butter, butter accounts for the bearing About 60% of the open space; remove the obstruction in the balance hole.

Fourth, the lack of pump flow

This is because: the slurry pump power speed is not matched or the belt is slipping, so the speed is low; the axial pump blade device angle is too small; the head is lacking, the pipeline is too long or the pipeline has a right angle bend; the suction stroke is high; the bottom valve The pipeline and the impeller are partially blocked or the impeller is incomplete; the water leakage of the outlet pipe is severe.

Sweeping method: Recover extra speed, remove belt grease, adjust belt tightness; adjust blade angle, reduce pump position, shorten pipeline or change duct tortuosity; seal pump leak, compact packing; remove obstruction Replace the impeller; replace the leak-reducing ring and block the leak.

Five, the pump can not suck water

The reason is that there is air in the pump body or in the inlet pipe, or the bottom valve is not tightly sealed, the water pump is not full, the vacuum pump packing is severely leaked, and the gate valve or the buckle door is not tightly closed.

Sweeping method: first press the water up, then fill the pump body with water, then turn it on. Check whether the check valve is tight and the pipeline and joint are leaking. If the air leak is found, apply the lubricating oil or the blending paint to the joint after tightening, and tighten the screw. Check the oil seal ring of the pump shaft. If the wear is severe, replace the new one.

The pipeline is leaking or leaking. Perhaps the nut does not tighten when the device is installed. If the leakage is not severe, the cement may be changed in the place where the air leaks or leaks, or the cement slurry mixed with the asphalt oil may be applied. Temporary repairs can be applied to wet mud or soft soap.

If there is water leakage at the joint, the nut can be tightened with a wrench. If the water leakage is severe, it must be disassembled and replaced with a cracked pipe. Reduce the lift and press the nozzle of the pump into the water for 0.5m.

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