Dynamic and Static Balance of Centrifugal Pump
1. Static Balance
The static balance of the centrifugal pump is corrected and balanced on a correction surface of the rotor, and the remaining unbalance after correction is to ensure that the rotor is within the specified range of the allowable unbalance during static state, which is also called static balance, also known as single-sided balance.
2. Dynamic Balance
The dynamic balance of the centrifugal pump is corrected and balanced on two or more correction surfaces of the rotor at the same time, and the remaining unbalance after correction is to ensure that the rotor is within the specified range of the allowable unbalance during dynamic, which is also called dynamic balance. Double-sided or multi-sided balance.
3. Selection and Determination of Rotor Balance of Centrifugal Pump
How to choose the balance method of the rotor for centrifugal pump is a key issue. Its selection has such a principle:
As long as it meets the needs of the use after the rotor is balanced, if it can be statically balanced, do not do dynamic balancing, and if it can do dynamic balance, do not do static and dynamic balancing. The reason is very simple. Static balancing is easier to do than dynamic balancing, saving labor, effort and cost.
4. Dynamic Balance Test
The dynamic balance test is a process of dynamic balance detection and correction of the centrifugal pump rotor to meet the requirements of use.
When the parts are rotating parts, such as various drive shafts, main shafts, fans, water pump impellers, tools, motors and rotors of steam turbines, they are collectively referred to as revolving bodies. In an ideal situation, when the rotating body rotates and does not rotate, the pressure on the bearing is the same, and such a rotating body is a balanced rotating body. However, due to various factors such as uneven material or blank defects, errors in processing and assembly, and even asymmetric geometric shapes in design, various revolving bodies in engineering make the revolving body rotate. The centrifugal inertial force generated by the tiny particles cannot cancel each other out. The centrifugal inertial force acts on the machine and its foundation through the bearing, causing vibration, noise, accelerated bearing wear, shortened mechanical life, and destructive accidents in severe cases.
To this end, the rotor must be balanced so that it reaches the allowable level of balancing accuracy, or the resulting mechanical vibration amplitude is reduced within the allowable range.