Feedback      |       Contact us       |       Chinese      |       EN






Hunan Changsha economic and Technological Development Zone, Lantian North Road, No. 1 DreamWorks (Star Factory) industrial supporting Park

Hunan Kelly always adheres to the business philosophy of "quality first service, integrity, cooperation and cooperation" for the company's guiding ideology to provide better quality products and services for customers.

Hunan Kare Air Conditioning Co., Ltd.  湘ICP备14005289号


Pump common faults and solutions

Pump common faults and solutions

Page view
1, can't start
First check the power supply, whether the connector is secure, the switch is tight, the fuse is blown, and the three-phase power supply is not equal. If there is a disconnection, poor contact, fuse blow, phase loss, the cause should be identified and repaired in time. Secondly, whether it is the mechanical failure 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, the leakage ring rust, the pump shaft is severely bent, etc. . Remedy: 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.
2, pump fever
Cause: Bearing damage, rolling bearing or bracket cover clearance is too small, pump shaft is bent or the two shafts are not concentric, the tape is too tight, oil or oil is not good, the balance hole on the impeller is blocked, the impeller is out of balance, and the direction is increased. The thrust on one side. Remedy: Replace the bearing; remove the rear cover, install a gasket between the bracket and the bearing housing; investigate the pump shaft or adjust the concentricity of the two shafts; adjust the tightness of the tape properly; add clean butter, butter accounts for the bearing About 60% of the inner space; remove the blockage in the balance hole.
3, insufficient traffic
This is because: the power speed is not matched or the belt slips, so the speed is low; the axial pump blade installation angle is too small; the head is insufficient, the pipeline is too long or the pipeline has a right angle bend; the suction stroke is high; the bottom valve, the pipeline And partial impeller or impeller defect; the water leakage of the outlet pipe is serious. Remedy: Restore rated speed, remove belt grease, adjust belt tightness; adjust blade angle, reduce pump installation position, shorten pipeline or change pipeline bending; seal pump leak, compact packing; clear blockage Replace the impeller; replace the leak-reducing ring and block the leak.
4, can't get water    
The reason is that there is air or water in the pump body, or the bottom valve is not closed, the water pump is not full, the fire pump packing is seriously leaked, and the gate valve or the door is not closed. Remedy: first press the water up, then fill the pump body with water, then turn on the machine, and check whether the check valve is tight, whether the pipeline or joint is leaking. If the air leak is found, apply it at the joint after disassembly. Lubricate the oil or adjust the paint, and tighten the screw to check the oil seal ring of the water pump shaft. If the wear is serious, replace the new one; if the pipeline leaks or leaks, the nut may not be tightened when installing. If the leakage is not serious, Apply cement or asphalt cement mixed in the place where air leaks or leaks. Temporary repair can apply some wet mud or soft soap. If there is water leakage at the joint, you can use a wrench to tighten the nut. If the water leakage is serious, it must be Reassemble, replace the cracked pipe, lower the lift, and press the nozzle of the pump into the water 0.5m.
5, severe vibration
There are several reasons for the following: unbalanced electric rotor; poor coupling of the coupling; wear and bending of the bearing; loose and broken parts of the rotating part; Adjustment, repair, reinforcement, straightening, replacement, etc. can be taken separately. The above situation is a common cause of pump failure. It is not the whole cause. In practice, the fault is handled. Due to the actual analysis, the principle of first and second should be followed, and blind operation should not be performed.
6. Overheating of supporting power motor
There are four reasons. First, the reason for the power supply: the voltage is high or low. Under certain load, if the voltage variation range should be +10% to -5% of the rated value, the motor will overheat; the three-phase voltage of the power supply is asymmetric, and the power supply is three. When the phase-to-phase voltage imbalance is more than 5%, the winding will be overheated; the phase loss operation, the experience shows that the agricultural motor is burned more than 85% due to the lack of phase operation, and the motor should be installed with phase loss protection device.
Second, the reason for the pump: the power is not matched, the small horse-drawn carriage, the motor is overloaded for a long time, the motor temperature is too high; the motor that starts too frequently, the quota is short or intermittent work continuously. The number of starts should be limited, the thermal protection should be selected correctly, and the scale should be used according to the calibration on the motor.
The third reason is the motor itself: the connection error is wrong, the delta 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, inter-turn short circuit or local grounding. When the light is light, the motor is partially overheated, and when it is severe, the insulation is severe. Burnt out; squirrel cage rotor broken or defective, motor running for 1 to 2 hours, core temperature rises rapidly; failure of ventilation system, should check whether the fan is damaged, whether the rotation direction is correct, whether the ventilation channel is blocked; bearing wear, rotor The eccentric broom causes the core of the stator to rub against the metal to make a sound, and the temperature of the core rises rapidly. When the motor is severe, the motor smokes and even the coil burns.
The fourth is the working environment: the motor windings are damp or 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: If there is a malfunction due to electrical reasons, the electrician who has obtained the professional qualification certificate should be repaired. Those who know nothing about it should not be blindly repaired to prevent personal injury.
7, deep well submersible pump does not have water or small amount of water
First look at the current difference between the current running at the pump and the current operation. If it is smaller than the normal operation time (basically 2/3 of the normal current), there are problems such as impeller wear and blockage of the uppermost check valve of the pump head. If the current is the same as in peace, it is the problem of leakage of the pipe mat, leakage of the pipe, water leakage of the pump body, etc. If the current is larger than that during normal operation, then basically it can be determined that the wearing parts are worn, and if the cable is added, If it is damaged, the water volume is the same as usual, but the current will become larger. The current of the 3-phase 380V motor is generally 2.2A. The above reasons can be detected by the repair personnel who frequently repair the deep well pump.