Common troubleshooting of laboratory centrifugal pumps

Yibocommunal
3 min readOct 9, 2023

What faults can centrifugal pumps encounter in the laboratory, and how can these conditions be eliminated? Let’s take a look. Diaphragm pumps
1. During use, the motor often fails to start, such as when the main power indicator light is on. At this time, the degree of carbon brush wear should be checked. If the carbon brush wear exceeds one-third of the total amount, it should be replaced with a new one in a timely manner. When the main power indicator light is not on, check if the indicator light fuse and indoor distribution board fuse are blown, and also check if the power cord is in good contact. If the fuse is broken, replace the fuse and keep the circuit smooth. The screw pump should also check the vacuum pump gauge and oil pressure indicator values. If the oil pressure is too high and the main engine cannot be started, it is necessary to check whether each oil circuit is blocked, especially whether the throttle hole is smooth. If it is not smooth, it should be cleaned to make it smooth.
2. If the bearing is damaged or its rotation is hindered, there is a lack of oil in the bearing or there is a lot of dirt in the bearing, which causes an increase in friction resistance. If the motor cannot reach the rated speed, the bearing should be cleaned or replaced in a timely manner. There is a layer of oxide on the surface of the commutator, even if it is burnt into unevenness or the brush does not match the outer edge of the commutator, which can cause a decrease in speed. The commutator and brush should be cleaned to ensure good contact. If there is a short circuit or open circuit in the rotor coil of a centrifugal pump, a multimeter can be used to check and rewind the coil. The rotor can cause rupture of the centrifuge tube, sample leakage, and rotor damage during use due to metal fatigue, overspeed, overstress, chemical corrosion, improper selection, imbalance of the rotating head during use, and temperature runaway. For the above situations, it is mainly required for the operator to master the operating procedures proficiently, select appropriate centrifugal pipes and rotors correctly, pay attention to strictly controlling each step of operation sequence, minimize unnecessary human damage, and use the rotor within the safety factor and warranty period. Magnetic pump
3. One of the reasons for the poor starting and cooling performance of the refrigerator is that the power supply is not available, and the power supply and fuse should be checked separately. If the voltage is too low and the safety device malfunctions, it can also prevent the refrigerator from starting. If the voltage is too low, it may be due to the low voltage of the power grid; Excessive wiring on the distribution board; The power cord is too long (ideal length is 3 meters), etc. Insufficient power cord capacity not only reduces voltage, but also causes accidents. Sewage pump
4. When the power supply voltage drops to 180–190VJ, the refrigerator cannot start, affecting the cooling effect. Poor ventilation performance, such as when the instrument is installed in direct sunlight or poorly ventilated areas, poor radiator effect, or the radiator cover is covered with dust, can also affect the cooling effect. The weight of the centrifuge tube is unbalanced and placed asymmetrically; There are foreign objects in the rotor hole, causing imbalanced load; Loose fixing nut at the upper end of the shaft, friction or bending of the shaft; The motor rotor will generate noise if it is not in the center of the magnetic field; Damage to the rotor itself can cause severe vibration and abnormal noise in the body. Self priming pump
Many times, it is caused by incorrect operation. After identifying the cause, correct operation can eliminate the abnormal phenomenon. During the work process, if any abnormal phenomena occur, the machine should be immediately shut down and forced operation is not allowed to avoid unnecessary losses or accidents. Chemical pumps.

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