In industrial production, rotary pumps, as an important conveying equipment, are widely used in various fields such as chemical engineering, food, and pharmaceuticals. With its unique working principle, it can efficiently convey various high-viscosity and particle-containing media. However, in the actual operation process, rotary pumps will inevitably encounter some problems. If these problems are not solved in a timely manner, they will not only affect production efficiency but may also lead to equipment damage and increase maintenance costs. Therefore, this article provides specific solutions and suggestions for the problems that are likely to occur during the operation of rotary pumps to help enterprises ensure the stable operation of production. 

I.Common Problems and Solutions during the Operation of Rotary Pumps 

1.Jamming 

Answer: Jamming is one of the more common problems during the operation of rotary pumps. The main reason may be that the pipeline has not been pre-cleaned, and there are sundries such as welding beads remaining inside. After these sundries enter the pump body, they will hinder the normal rotation of the rotor, and then lead to the jamming phenomenon. The solution is to thoroughly clean the pipeline before starting the rotary pump, carefully check whether there are welding beads, rust, or other foreign objects in the pipeline, and ensure that the inside of the pipeline is clean and unobstructed, so as to avoid the jamming problem caused by the entry of sundries from the source.

2.Mechanical Seal Leakage 

Answer: Mechanical seal leakage is usually caused by dry friction. When there is insufficient lubrication or cooling at the mechanical seal, the sealing surface will generate high temperature due to friction, which will lead to a decrease in sealing performance and leakage. To solve this problem, in daily operation, we should pay close attention to the working state of the mechanical seal, ensure that there is sufficient coolant or lubricant in the sealing cavity, and avoid the occurrence of dry friction. At the same time, regularly check the wear condition of the mechanical seal, and replace the severely worn seals in a timely manner to ensure the sealing performance of the mechanical seal. 

3.Tripping as Soon as It Starts 

Answer: If the rotary pump trips as soon as it starts, it is very likely that the material has dried inside the pump. When the pump is shut down for a long time or the remaining material in the pump is not cleaned up in time, it will dry and adhere to the inside of the pump body under certain conditions. When starting again, the motor needs to overcome the huge resistance brought by the dried material, resulting in an excessive current and causing the tripping. Therefore, before starting, check the situation inside the pump. If there is dried material, clean it first. You can inject an appropriate amount of solvent or clean water, soak it for a period of time, and then start it to ensure that there is no obstruction inside the pump body. 

4.Vibration of the Pump and the Pipeline 

Answer: The vibration of the pump body and the pipeline may be caused by insufficient supply or a too small inlet. When the material supply is discontinuous or the diameter of the inlet is too small, the pump will vibrate due to the poor suction of the material during operation, and this vibration will also be transmitted to the pipeline. To solve this problem, it is necessary to check the material supply system to ensure sufficient and stable material supply. At the same time, evaluate whether the diameter of the inlet is appropriate. If the inlet is too small, consider appropriately expanding the inlet to improve the suction conditions of the material and reduce the vibration phenomenon.

5.Inability to Reach the Required Flow and Pressure 

Answer: If the flow and pressure of the rotary pump cannot meet the expected requirements, expanding the feed inlet and increasing the rotation speed are effective solutions. A too small feed inlet will limit the amount of material entering, which will affect the flow and pressure. Appropriately expanding the feed inlet can increase the suction amount of the material. In addition, too low a rotation speed will also lead to insufficient output flow and pressure of the pump. Increasing the rotation speed within the allowable range of the equipment can improve the working efficiency of the pump and make the flow and pressure reach the normal level. However, when adjusting the rotation speed, closely monitor the operation status of the equipment to avoid other problems caused by too high a rotation speed. 

6.No Discharge 

Answer: If the rotary pump does not discharge material, it is very likely that the seals at the inlet and outlet are not good. If the seals at the inlet and outlet are not tight, leakage will occur during the operation of the pump, and there will not be enough pressure to convey the material. At this time, it is necessary to check and improve the seals at the inlet and outlet. Check whether the seals are damaged, aged, or not installed in place, replace the damaged seals in a timely manner, ensure good seals at the inlet and outlet, and thus ensure the normal discharge of the pump. 

7.Motor Overheating 

Answer: Motor overheating is often caused by too high a frequency. When the operating frequency of the rotary pump exceeds the rated range of the motor, the load of the motor will increase, generating excessive heat. To solve this problem, the operating frequency should be reduced and controlled within the rated range of the motor. At the same time, ensure that the heat dissipation system of the motor works properly, regularly clean the dust and sundries on the surface of the motor, and ensure that the motor has good heat dissipation conditions to avoid damage to the motor due to overheating. 

8.Decrease in Flow 

Answer: The decrease in flow may be caused by the wear of the rotor. With the long-term operation of the rotary pump, the rotor will inevitably be worn. After the rotor is worn, the gap between the rotor and the pump body increases, resulting in an increase in material backflow and a decrease in flow. At this time, it is necessary to replace the rotor in a timely manner, select reliable rotor accessories, and ensure the matching accuracy between the rotor and the pump body to restore the normal flow of the pump. 

9.Water Leakage from the Mechanical Seal

Answer: Water leakage from the mechanical seal is usually caused by the damage of the oil seal. The oil seal is an important component to prevent water leakage at the mechanical seal. Once the oil seal is damaged, water will leak from the mechanical seal. The solution to this problem is to replace the oil seal. When replacing, select the appropriate specification of the oil seal and ensure correct installation to restore the sealing performance of the mechanical seal and prevent the occurrence of water leakage. 

II.Targeted Suggestions 

In order to reduce the frequency of problems occurring during the operation of rotary pumps, in addition to taking corresponding solutions for specific problems, we should also pay attention to daily maintenance and management. Enterprises should formulate a complete equipment maintenance plan, regularly inspect and maintain the rotary pump, including checking the wear condition, sealing performance, lubrication condition, etc. of each component. At the same time, strengthen the training of operators, improve their operation skills and maintenance awareness, so that they can operate the equipment correctly and find and deal with the abnormal situations occurring during the operation of the equipment in a timely manner. 

In conclusion, there are various problems that may occur during the operation of rotary pumps. It is necessary to have an in-depth understanding of the causes of each problem and adopt precise and effective solutions. In the long-term practice, Bonve Pump Industry has always attached great importance to equipment maintenance management. By strengthening daily maintenance, improving the skills of operators, and constructing a complete equipment management system, it has effectively reduced the failure rate of rotary pumps, ensured their stable and efficient operation, and laid a reliable foundation for enterprise production. In the future, Bonve will always adhere to the concept of "wholeheartedly making good rotary pumps" and is committed to providing customized conveying and mixing solutions for global customers.