Common Troubleshooting And Treatment Techniques For Sanitary Rotary Vane Pumps

Sanitary Rotary Lobe Pump Summary of common knowledge troubleshooting skills:

Common troubleshooting skills for sanitary rotary vane pumps. More importantly, to master the troubleshooting skills of sanitary rotary vane pumps, you must know the working principle of sanitary rotary vane pumps, the structure of the pump, and the necessary operating skills and mechanical maintenance knowledge. With this knowledge, you can quickly determine the fault according to the abnormal situation of the pump.

The specific troubleshooting and treatment skills of sanitary rotary vane pumps are:

1. The pump is stuck. The treatment method is to turn the coupling by hand to check, disassemble and check if necessary, and eliminate the dynamic and static faults.

2. The pump does not discharge liquid, the pump is not fully filled (or the gas in the pump is not completely discharged). The treatment method is to refill the pump;
The pump is not turning in the right direction. The treatment method is to check the direction of rotation;
The pump speed is too low. The treatment method is to check the speed and increase the speed;
The filter is blocked and the bottom valve is not working. The treatment method is to check the filter and remove debris;
The suction height is too high, or there is a vacuum in the suction tank. The treatment method is to reduce the suction height; check the suction tank pressure.

3. The pump is interrupted after discharging liquid. The reason and treatment method are that the suction pipe leaks. The treatment method is to check the connection of the suction side pipe and the sealing of the stuffing box:
The gas on the suction side is not completely discharged when filling the pump. The treatment method is to require refilling the pump;
The suction side is suddenly blocked by foreign objects. The treatment method is to stop the pump to deal with the foreign objects;
A large amount of gas is inhaled. The treatment method is to check whether there is a vortex at the suction port and whether the immersion depth is too shallow.

4. Insufficient flow, reason and treatment method, the static head of the system increases. The treatment method is to check the liquid height and system pressure;
Increased resistance loss. The treatment method is to check obstacles such as pipelines and check valves;
The wear rings of the casing and impeller are too worn. The treatment method is to replace or repair the wear rings and impellers;
Leakage in other parts. The treatment method is to check the shaft seal and other parts;
The pump impeller is blocked, worn, and corroded. The treatment method is to clean, check, and replace.

5. Insufficient head, reason and treatment method, the impeller is installed upside down (double suction impeller). The treatment method is to check the impeller; the liquid density and viscosity do not meet the design conditions. The treatment method is to check the physical properties of the liquid;
The flow rate is too large during operation. The treatment method is to reduce the flow rate.

6. Pump vibration or abnormal sound, causes and treatment methods. The vibration frequency is 0~40% of the working speed. Excessive bearing clearance, loose bearing shells, impurities in the oil, poor oil quality (viscosity, temperature), oil foaming due to air or process liquid, poor lubrication, and bearing damage. The treatment method is to take corresponding measures after inspection, such as adjusting the bearing clearance, removing impurities in the oil, and replacing new oil;

The vibration frequency is 60%~100% of the working speed, or the seal clearance is too large, the retaining ring is loose, and the seal is worn. The treatment method is to check, adjust or replace the seal; the vibration frequency is 2 times the working speed, misalignment, loose coupling, friction of the sealing device, deformation of the housing, bearing damage, support resonance, thrust bearing damage, shaft bending, and poor fit. The treatment method is to check, take corresponding measures, repair, adjust or replace; the vibration frequency is n times the working speed. Pressure pulsation, misalignment, housing deformation, seal friction, support or foundation resonance, pipeline and machine resonance; strengthen foundation or pipeline; vibration frequency is very high. Shaft friction, seal, bearing, imprecision, bearing shaking, poor shrink fit, etc.

7. Causes and treatment methods of bearing heating, bearing pad scraping does not meet the requirements. The treatment method is to repair the bearing pad or replace it.
The bearing clearance is too small. The treatment method is to readjust the bearing clearance or scrape;
Insufficient lubricating oil and poor oil quality. The treatment method is to increase the oil volume or replace the lubricating oil;
The bearing is poorly assembled. The treatment method is to check the bearing assembly as required and eliminate the factors that do not meet the requirements;
Cooling water is disconnected. The treatment method is to check and repair;
Bearing is worn or loose. The treatment method is to repair the bearing or scrap it.
If it is loose, tighten the relevant bolts; The pump shaft is bent. The treatment method is to correct the pump shaft;
The oil ring is deformed, the oil ring cannot rotate, and it cannot carry oil. The treatment method is to update the oil ring;
The coupling is poorly aligned or the axial clearance is too small. The solution is to check the alignment and adjust the axial clearance.

8. The shaft seal is hot. The reason and solution are that the packing is pressed too tightly or rubbed. The solution is to loosen the packing and check the water seal pipe;
The water seal ring is misaligned with the water seal pipe. The solution is to recheck the alignment;
The flushing and cooling are poor. The solution is to check the flushing cooling circulation pipe;
The mechanical seal is faulty. The solution is to check the mechanical seal.

9. The reason and solution for the large rotor movement are as follows: improper operation, and the operating conditions are far away from the design conditions of the pump.
Solution: Strictly operate to keep the pump running near the design conditions;
Balance is not smooth. The solution is to clear the balance pipe;
The material of the balance plate and the balance plate seat does not meet the requirements.
The solution is to replace the balance plate and the balance plate seat with materials that meet the requirements.