In the operation of the pump, vibration is unavoidable, but we must always monitor whether the coefficient of the vibration of the pump is within the safety factor range. When the coefficient exceeds the safety factor or exceeds the safety factor, we must carry out repairs and maintenance in time. We cannot Wait until the dead sheep are fastened again.
Therefore, in the process of manufacture and installation of the pump unit, as well as the design, operation and management of the pump unit, we should avoid the interference caused by vibration as much as possible, and minimize the damage to the vibration. When the pump room or the unit vibrates, the cause of the vibration should be analyzed one by one according to the specific situation. After finding the crux of the problem, effective technical measures should be taken to eliminate it. Some measures are relatively simple and some are quite complicated. If a large amount of capital is needed, a technical and economic comparison of the several options that can be used should be made, combined with the technological transformation of the unit. The common causes and elimination measures of the motor, pump and pump room vibration are given below. We hope to help you quickly solve the problem of pump vibration.
1. Common causes of motor vibration and elimination measures
1) Partial wear of bearings: Units do not wear out with different hearts or bearings.
Elimination measures: Re-align the unit concentricity and adjust or replace the bearings.
2) Stator rotor friction: uneven air gap or bearing wear.
Elimination measures: Re-adjust air gap, adjust or replace bearings.
3) The rotor cannot stop at any position or the power is unbalanced.
Elimination measures: Recalibrate rotor static balance and dynamic balance.
4) Axial looseness: loose screws or poor installation.
Elimination measures: Tighten the screws and check the installation quality.
5) The foundation is in vibration: The basic stiffness is poor or the bottom corner screw is loose.
Elimination measures: Reinforce the foundation or tighten the corner screws.
6) Three-phase current instability: Torque decreases, rotor cage bars or end rings fail.
Elimination measures: Check and repair rotor bar or end ring.
2. Common causes of pump vibration and elimination measures
1) Difficulties in manual cranking: Bending of the pump shaft, wear of the bearing, misalignment of the unit, and collision of the impeller with the pump casing.
Elimination measures: Straighten the pump shaft, adjust or replace the bearing, recalibrate the unit concentricity, and adjust the clearance.
2) Excessive shaft oscillating: worn bearings or journals or excessive clearances.
Elimination measures: Repair the journal, adjust or replace the bearing.
3) Hydraulic imbalance: The impeller is unbalanced and the individual blades of the centrifugal pump are blocked or damaged.
Elimination measures: Recalibrate impeller static balance and dynamic balance, eliminate plugging, repair or replace impeller.
4) Axial pump shaft power is too large: the water level in the inlet tank is too low, the depth of the impeller inundation is not enough, debris is wound around the impeller, the pump cavitation damage is different, and the impeller is defective.
Eliminating measures: Raise the water level in the water tank, reduce the installation height of the water pump to eliminate impurities, set the fences, and repair or replace the impeller.
5) Fundamentals in vibration: The basic stiffness is poor or the bottom corner screws are loose or resonant.
Elimination measures: Reinforce the foundation and tighten the anchor bolts.
6) The efficiency of the centrifugal pump unit drastically decreased or the efficiency of the axial flow pump unit decreased slightly, accompanied by cavitation noise.
Elimination measures: Change the pump speed, avoid the resonance area, find out the cause of cavitation, and take measures to eliminate cavitation.
3, vibration caused by other reasons and eliminate measures
1) The trash racks are clogged and the water level in the pool is reduced.
Elimination measures: Clean the fences and install a new sewage cleaning device.
2) The design of the front pool and inlet basin is irrational, and the inlet channel and the pump are not matched to deteriorate the inlet conditions.
Eliminating measures: The cleanliness of the fences shall be cleaned, and the design of the sewage cleaning device shall be rationally designed and the design of the front pool, the inlet pool and the inlet flow path shall be added.
3) The siphoning time is too long to allow the unit to operate in non-design conditions for a longer period of time.
Eliminating measures: Add vacuum device and rationally design and improve the siphon discharge channel.
4) The inlet pipe is not fixed or causes resonance.
Eliminating measures: Adding pipe piers and support piers to reinforce pipeline support, change operating parameters, and change operating parameters to avoid resonance.
5) Repeated hitting of the door to the door seat or closing the impact force is too great.
Elimination measures: A vent hole is provided in front of the outlet of the flow channel (or pipeline), and a reasonable design is adopted to take control measures to reduce the impact force when the flap is closed.
6) Rapid pressure changes and water hammer in the outlet pipe.
Elimination measures: slow-closing valves, pressure regulating wells and other water hammer prevention measures.
7) The starting and stopping sequence of the unit is unreasonable, resulting in deterioration of the water inlet condition of the pump.
Elimination measures: Optimize the start and stop sequence.
Therefore, in the process of manufacture and installation of the pump unit, as well as the design, operation and management of the pump unit, we should avoid the interference caused by vibration as much as possible, and minimize the damage to the vibration. When the pump room or the unit vibrates, the cause of the vibration should be analyzed one by one according to the specific situation. After finding the crux of the problem, effective technical measures should be taken to eliminate it. Some measures are relatively simple and some are quite complicated. If a large amount of capital is needed, a technical and economic comparison of the several options that can be used should be made, combined with the technological transformation of the unit. The common causes and elimination measures of the motor, pump and pump room vibration are given below. We hope to help you quickly solve the problem of pump vibration.
1. Common causes of motor vibration and elimination measures
1) Partial wear of bearings: Units do not wear out with different hearts or bearings.
Elimination measures: Re-align the unit concentricity and adjust or replace the bearings.
2) Stator rotor friction: uneven air gap or bearing wear.
Elimination measures: Re-adjust air gap, adjust or replace bearings.
3) The rotor cannot stop at any position or the power is unbalanced.
Elimination measures: Recalibrate rotor static balance and dynamic balance.
4) Axial looseness: loose screws or poor installation.
Elimination measures: Tighten the screws and check the installation quality.
5) The foundation is in vibration: The basic stiffness is poor or the bottom corner screw is loose.
Elimination measures: Reinforce the foundation or tighten the corner screws.
6) Three-phase current instability: Torque decreases, rotor cage bars or end rings fail.
Elimination measures: Check and repair rotor bar or end ring.
2. Common causes of pump vibration and elimination measures
1) Difficulties in manual cranking: Bending of the pump shaft, wear of the bearing, misalignment of the unit, and collision of the impeller with the pump casing.
Elimination measures: Straighten the pump shaft, adjust or replace the bearing, recalibrate the unit concentricity, and adjust the clearance.
2) Excessive shaft oscillating: worn bearings or journals or excessive clearances.
Elimination measures: Repair the journal, adjust or replace the bearing.
3) Hydraulic imbalance: The impeller is unbalanced and the individual blades of the centrifugal pump are blocked or damaged.
Elimination measures: Recalibrate impeller static balance and dynamic balance, eliminate plugging, repair or replace impeller.
4) Axial pump shaft power is too large: the water level in the inlet tank is too low, the depth of the impeller inundation is not enough, debris is wound around the impeller, the pump cavitation damage is different, and the impeller is defective.
Eliminating measures: Raise the water level in the water tank, reduce the installation height of the water pump to eliminate impurities, set the fences, and repair or replace the impeller.
5) Fundamentals in vibration: The basic stiffness is poor or the bottom corner screws are loose or resonant.
Elimination measures: Reinforce the foundation and tighten the anchor bolts.
6) The efficiency of the centrifugal pump unit drastically decreased or the efficiency of the axial flow pump unit decreased slightly, accompanied by cavitation noise.
Elimination measures: Change the pump speed, avoid the resonance area, find out the cause of cavitation, and take measures to eliminate cavitation.
3, vibration caused by other reasons and eliminate measures
1) The trash racks are clogged and the water level in the pool is reduced.
Elimination measures: Clean the fences and install a new sewage cleaning device.
2) The design of the front pool and inlet basin is irrational, and the inlet channel and the pump are not matched to deteriorate the inlet conditions.
Eliminating measures: The cleanliness of the fences shall be cleaned, and the design of the sewage cleaning device shall be rationally designed and the design of the front pool, the inlet pool and the inlet flow path shall be added.
3) The siphoning time is too long to allow the unit to operate in non-design conditions for a longer period of time.
Eliminating measures: Add vacuum device and rationally design and improve the siphon discharge channel.
4) The inlet pipe is not fixed or causes resonance.
Eliminating measures: Adding pipe piers and support piers to reinforce pipeline support, change operating parameters, and change operating parameters to avoid resonance.
5) Repeated hitting of the door to the door seat or closing the impact force is too great.
Elimination measures: A vent hole is provided in front of the outlet of the flow channel (or pipeline), and a reasonable design is adopted to take control measures to reduce the impact force when the flap is closed.
6) Rapid pressure changes and water hammer in the outlet pipe.
Elimination measures: slow-closing valves, pressure regulating wells and other water hammer prevention measures.
7) The starting and stopping sequence of the unit is unreasonable, resulting in deterioration of the water inlet condition of the pump.
Elimination measures: Optimize the start and stop sequence.
A tungsten alloy blank is a piece of material made from a mixture of tungsten and other metals, such as nickel, iron, or copper. Tungsten alloys are known for their high density, strength, and resistance to corrosion and wear. These blanks can be used to create a variety of products, including bullets, weights for fishing or hunting, radiation shields, and aerospace components. The blanks are typically produced through a process of powder metallurgy, where the tungsten and other metals are mixed together, pressed into a mold, and then sintered at high temperatures to create a solid piece of material.
Tungsten Alloy Blank,Tungsten Alloy Material,Tungsten Alloys Sheet,Tungsten Heavy Alloys Blank
Zhuzhou Jiuding Metal Technology Co., Ltd. , https://www.zztungstenheavyalloy.com