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Three steps to eliminate the pump vibration hazards of technical measures
Low-intensity mechanical vibrations are unavoidable in rotating equipment and flow media. Therefore, during the manufacture and installation of the unit, the interference caused by vibration should be avoided as far as possible in the design, operation and management of the unit so as to minimize the vibration hazard. When the pump room or unit vibration occurs, should be based on the specific circumstances, one by one to analyze the possible causes of vibration, identify the crux of the problem, to take effective technical measures to eliminate. Some measures are relatively simple, some measures are quite complicated. If you need a lot of money, should deal with several programs for technical and economic comparison, combined with unit technological transformation. The following gives the motor, pump and pump room vibration common causes and elimination measures. 1, common causes of motor vibration and elimination 1) Bearing eccentric wear: the unit is not the heart or bearing wear. Elimination measures: re-school crew concentricity, adjust or replace the bearings. 2) stator friction: uneven air gap or bearing wear. Elimination measures: readjust the air gap, adjust or replace the bearing. 3) The rotor can not stop at any position or power imbalance. Elimination measures: re-school rotor static balance and dynamic balance. 4) Loosening the shaft: The screw is loose or badly installed. Remedy: Tighten the screws and check the mounting quality. 5) based on the vibration: the basis of poor stiffness or bottom corner screw loose. Remedy: Reinforce the foundation or tighten the bottom corner screw. 6) Three-phase current instability: Torque decreases, rotor cage or end ring fails. Remedy: Check and repair rotor cages or end rings. 2, common causes and elimination of pump vibration 1) manual crank difficult: shaft bending, bearing wear, the unit is not the heart, the impeller touch the pump shell. Elimination measures: straightening pump shaft, adjust or replace the bearings, re-unit concentricity, re-adjust the gap. 2) Pump shaft oversteer: bearing and journal wear or excessive clearance. Elimination measures: Repair journal, adjust or replace bearing. 3) hydraulic imbalance: impeller imbalance, centrifugal block individual leaf blockage or damage. Elimination measures: re-school impeller static balance and dynamic balance, eliminate clogging, repair or replacement of the impeller. 4) axial pump shaft power is too large: the water level is too low into the water tank, impeller inundation depth is not enough debris around the impeller, pump cavitation damage to varying degrees, the impeller defect. Elimination measures: Raise the water level into the pool, reduce the elevation of the pump to remove debris, and set the fence eaves, repair or replacement of the impeller. 5) based on the vibration: the basis of stiffness difference or bottom screw loose or resonance. Elimination measures: Reinforcing the foundation, tighten the ground screw. 6) Centrifugal pump unit efficiency dropped sharply or axial pump unit efficiency decreased slightly, accompanied by cavitation noise. Elimination measures: Change the pump speed, avoid the resonance area, identify the cause of cavitation occurs, take measures to eliminate cavitation. 3, other causes of the unit vibration and elimination measures 1) trash rack blocked, into the pool water level lower. Elimination measures: fence decontamination, add column fence decontamination device. 2) The front pool and into the pool design is not reasonable, the inlet channel and the pump does not complete so that the water conditions worsened. Elimination measures: bar decontamination clean, add a bar ram decontamination device design and reasonable into the former pool, into the pool and inflow channel design. 3) Siphon formation time is too long, so that the unit for a long time in non-design conditions. Elimination measures: Add vacuum device, reasonable design and improvement of siphon water outlet. 4) influent pipe fixed or cause resonance. Elimination measures: Add pipe piers and piers, pipe reinforcement support, change operating parameters, change operating parameters to avoid the resonance zone. 5) beat the door repeatedly hit the door or close the impact force is too large. Elimination measures: Flow channel (or pipe) outlet before the vent, a reasonable design of the door to take control measures to reduce the impact when the shutter door closed. 6) sudden changes in the pressure inside the water pipe and water hammer effect. Elimination measures: Slow closing valve and surge tank and other anti-water hammer measures. 7) Unit start and stop the order is not reasonable, resulting in deteriorating water pump conditions. Elimination measures: optimize the boot and shutdown sequence.