Four Reasons For Water Pump Vibration
Dec 01, 2024
There are many reasons that can cause vibration in the unit and pump room buildings, and some factors are both related and interact with each other. In summary, there are four main reasons.
1. Electrical aspect
The motor is the main equipment of the unit, and the magnetic imbalance inside the motor and the imbalance of other electrical systems often cause vibration and noise. During the operation of asynchronous motors, the radial alternating magnetic pulling force between the stator and rotor generated by the interaction of harmonic magnetic flux between the stator and rotor teeth, or during the operation of large synchronous motors, the magnetic center of the stator and rotor is not consistent or the air gap difference in all directions exceeds the allowable deviation value, may cause periodic vibration and noise of the motor.
2. Mechanical aspect
Unequal quality, rough manufacturing, poor installation quality, asymmetric unit axis, excessive swing, poor mechanical strength and stiffness of components, wear and damage of bearings and sealing components, as well as resonance between the critical speed of the water pump and the natural frequency of the unit, can all produce strong vibrations and noise.
3. Hydraulic aspect
Uneven flow velocity and pressure distribution at the inlet and outlet of the water pump, pressure pulsation, liquid flow, deviation and detachment of the working fluid at the inlet and outlet of the pump, non rated operating conditions, and cavitation caused by various reasons are common causes of pump unit vibration. The sudden changes in pressure and water hammer in the water pipeline caused by dynamic transition processes such as pump start-up and shutdown, valve opening and closing, changes in operating conditions, and emergency shutdown in accidents often lead to vibration in the pump room and units.
4. Hydraulic and other aspects
Unreasonable or incompatible design of the inlet channel of the unit, improper submergence depth of the water pump, and unreasonable start-up and shutdown sequence of the unit can all deteriorate the inlet conditions, generate vortices, induce cavitation, or exacerbate the vibration of the unit and pump room. When starting a unit that uses a broken siphon vacuum cutoff, if the air in the hump section is difficult to carry and the siphon time is too long; The design of the tapping door for the unit that cuts off the flow is unreasonable, constantly hitting the tapping door seat with intermittent opening and closing; Uneven settlement or poor rigidity of the foundation supporting the water pump and motor can also cause vibration of the unit.
There are many reasons that can cause vibration in the unit and pump room buildings, and some factors are both related and interact with each other. In summary, there are four main reasons.
1. Electrical aspect
The motor is the main equipment of the unit, and the magnetic imbalance inside the motor and the imbalance of other electrical systems often cause vibration and noise. During the operation of asynchronous motors, the radial alternating magnetic pulling force between the stator and rotor generated by the interaction of harmonic magnetic flux between the stator and rotor teeth, or during the operation of large synchronous motors, the magnetic center of the stator and rotor is not consistent or the air gap difference in all directions exceeds the allowable deviation value, may cause periodic vibration and noise of the motor.
2. Mechanical aspect
Unequal quality, rough manufacturing, poor installation quality, asymmetric unit axis, excessive swing, poor mechanical strength and stiffness of components, wear and damage of bearings and sealing components, as well as resonance between the critical speed of the water pump and the natural frequency of the unit, can all produce strong vibrations and noise.
3. Hydraulic aspect
Uneven flow velocity and pressure distribution at the inlet and outlet of the water pump, pressure pulsation, liquid flow, deviation and detachment of the working fluid at the inlet and outlet of the pump, non rated operating conditions, and cavitation caused by various reasons are common causes of pump unit vibration. The sudden changes in pressure and water hammer in the water pipeline caused by dynamic transition processes such as pump start-up and shutdown, valve opening and closing, changes in operating conditions, and emergency shutdown in accidents often lead to vibration in the pump room and units.
4. Hydraulic and other aspects
Unreasonable or incompatible design of the inlet channel of the unit, improper submergence depth of the water pump, and unreasonable start-up and shutdown sequence of the unit can all deteriorate the inlet conditions, generate vortices, induce cavitation, or exacerbate the vibration of the unit and pump room. When starting a unit that uses a broken siphon vacuum cutoff, if the air in the hump section is difficult to carry and the siphon time is too long; The design of the tapping door for the unit that cuts off the flow is unreasonable, constantly hitting the tapping door seat with intermittent opening and closing; Uneven settlement or poor rigidity of the foundation supporting the water pump and motor can also cause vibration of the unit.