1PLCOverview of Submersible Pump

PLCThe series of pumps were introduced by our factory from France's Rimon Schneider（Jeumont•Schneider）Pump design and manufacturing technology and Otter Samber（Haute•Sambre）The corrosion-resistant and wear-resistant submersible pump manufactured by the company's special wear-resistant and corrosion-resistant smelting and casting technology.

This series of pumps is a single-stage single suction cantilever vertical centrifugal pump designed based on multiphase flow theory and practical experience. It is suitable for transporting suspended particles, corrosive and abrasive media, viscous media, liquids with scaling characteristics, and liquids containing gases. It fully considers factors such as good solid matter passing capacity, reliability, service life, and efficiency of flow components, and is an ideal pump type for transporting solid phase media. This series of pumps is widely used in industries such as fertilizer, chemical, sewage treatment, food, paper, sugar, mining, etc.

IIPLCStructural characteristics of desulfurization submersible pump

（1）The pump is designed with strong overall reliability and adopts a rigid design. The pump shaft is thick, the bearing capacity is large, and the rotor is subjected to reasonable force, ensuring continuous long-term operation of a single pump;

（2）The impeller is a closed wide channel impeller, which is conducive to the passage of solid media without causing blockage. The impeller has front and rear back blades, with the front back blades used to prevent the medium from flowing back towards the pump inlet direction, and the back blades used to balance axial forces and reduce axial leakage pressure to improve pump efficiency;

（3）The pump is equipped with an axial adjustment device. When there is a certain degree of abrasion or corrosion on the overcurrent components, the clearance between the impeller and the housing can be adjusted through the adjustment device to maximize the recovery of pump performance and extend the service life of the pump.

（4）Double bearing support, with a long distance between the two bearings.

（5）The shaft diameter is thick, the shaft steps are few, and the rigidity of the shaft is good.

（6）The design of the support tube and bearing box has good rigidity, and the pump runs smoothly.

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IIIPLCSchematic diagram of desulfurization liquid submersible pump structure

4Analysis and Solution of Pump Vibration Faults

Based on accumulated experience in use, the main reasons for the vibration of this type of pump are the imbalance between the impeller and shaft during operation and the installation quality.

　　1Imbalance between impeller and shaft during operation

The phenomenon of pump vibration caused by imbalance between the impeller and the shaft during operation is quite common, so we will first analyze the imbalance between the impeller and the shaft during operation.

（1）The impeller is severely corroded and eroded.

Cause analysis: During long-term operation of the submersible pump, the impeller will be eroded and corroded by the medium, resulting in large and small pores and sand holes, causing the impeller's trajectory to be non perpendicular to the shaft's trajectory, leading to vibration.

Solution: When the local wear on the surface of the impeller exceeds one-third of the original thickness, the impeller should be replaced immediately.

（2）The joint surface between the shaft head and the impeller is worn.

Cause analysis: During the long-term operation of the submersible pump, special attention should be paid to the wear of the joint surface between the shaft head and the impeller during maintenance. If the joint surface wear exceeds the standard, it can also cause imbalance between the impeller and the shaft during operation.

Solution: Depending on the degree of wear, if there is slight wear, the joint surface between the shaft head and impeller should be outsourced for spraying; If the wear is severe, a new shaft should be replaced.

　　2Installation quality

（1）The bearing is not installed properly.

Cause analysis: If the bearing is not installed properly during installation, there will be a gap between the bearing and the shaft shoulder, and the bearing will have significant axial displacement during operation, causing vibration during pump operation.

Solution: First, clean the bearing and shaft shoulder with kerosene or gasoline, and then heat the bearing to100～120At ℃, install it in close contact with the top shoulder of the shaft, then beat the locking nut to death and firmly fix the bearing.

（2）The key connecting the upper bearing liner and the shaft is not installed properly.

Cause analysis: If the key connecting the upper bearing liner and the shaft is not assembled properly or forgotten to be assembled, the upper part of the pump body will be out of sync with the lower part, resulting in vibration of the pump body during operation.

Solution: When disassembling and inspecting the pump body, the key should be retracted and remember to reinstall it to ensure proper assembly.

（3）There are inclusions in the impeller flow channel.

Cause analysis: Impurities are sucked into the suction port, which can block some of the flow channels and increase the friction loss between the impeller and the volute. In this case, the output torque of the motor increases, resulting in an increase in motor current and exacerbating vibration.

Solution: Add a filter screen at the pump suction end or pit inlet to prevent debris from entering, and clean it regularly.

（4）The foundation plate was not leveled and aligned during the installation of the submersible pump.

Cause analysis: If the foundation leveling work is not carried out during installation, there will be gaps and inadequate contact between the installation plate and the foundation, resulting in vibration during pump operation.

Solution: Align and level the foundation plate, select the point of application with shims, and set at least one set of shims near the foundation bolts, but they should be symmetrically arranged. A set of shims should also be placed on each side of the joint.

（5）Insufficient lubricating grease was applied during reassembly.

Cause analysis: If too little lubricating grease is applied during reassembly, it will affect the heat dissipation of the bearings, and the pump will experience a significant temperature rise shortly after operation, ultimately leading to bearing damage and pump body vibration.

Solution: Apply lubricating grease to the inside of the bearing during reassembly.