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1, Definition 1) Static balance Correction balance and correction unbalance amount are carried out on a calibration surface of the rotor to ensure that the rotor is static within the stipulated range of allowable unbalance, which is also called static equilibrium. 2) Dynamic balance On the two correction planes of the rotor, the balance of correction and the remaining unbalance are corrected at the same time to ensure that the rotor is within the stipulated range of allowable unbalance, which is also called balance. 2, the rotor balance of choice and determine how to choose the balance of the rotor is a key issue. The choice of such a principle: as long as the content of the rotor to meet the balance needs to be able to do static balance, do not do dynamic balance, do dynamic balance, do not do static and dynamic balance. The reason is simple, static balance easier to do than the dynamic balance, dynamic balance easier to do than static and dynamic balance, saving power, effort, cost savings. So how to determine the type of balance of the rotor? Need to be determined from the following factors and basis: 1) the rotor geometry, structure size, especially the diameter of the rotor D and the distance between the two calibration surfaces of the rotor size b ratio, and the rotor support spacing and so on. 2) Rotor speed. 3) the technical requirements of the rotor balancing technology, such as GB3215, API610 Eighth Edition, GB9239 and ISO1940 and so on. 3, the conditions for the rotor to do static balance In the GB9239-88 balance standard, the condition of the static rotor to do static balance is defined as: "If the support distance of the plate rotor is large enough and when the axial rotation of the disk-shaped part is small, Thus neglecting even unbalance (dynamic balance), a calibration surface can be used to correct unbalance ie single-sided (static) balance, and it is necessary to verify whether these conditions are satisfied for a specific rotor.In the case of a large number of types of rotors in a plane After balancing, the maximum residual even unbalance can be found and divided by the support distance, and if the value is not more than half of the allowable residual imbalance in the worst case, a one-sided (static) balance is sufficient Quoted from this definition is not difficult to see that the rotor only single (static) balance of the conditions there are three main aspects: one is the rotor geometry is disk-shaped; one is the balance of the rotor balancing machine when the support spacing to be large ; Another is the rotor surface rotation when the correction of its beating is very small. The above three conditions for the following description: 1) What is the main disc rotor rotor The diameter D and the distance between the two correction surface of the rotor size b ratio to determine the provisions of the eighth edition of the standard API610 D / b <6, the rotor can only do single-sided balance on it; D / b ≥ 6 can be Whether the rotor is a disk rotor condition, but can not be absolute, because the balance of the rotor should also consider the working speed of the rotor. 2) The support spacing to no specific parameters, but with the rotor correction surface spacing b The ratio of ≥ 5 or more are considered to be large enough to support the pitch 3) The rotor axial run-out mainly refers to the face of the correction surface when the rotor rotation beating, because any rotor balancing test are finished, processed to ensure that the rotor Behavioral tolerance between hole and calibration surface, end surface runout is very small.According to the above-mentioned single-sided (static) balance of the rotor conditions, combined with the technical aspects of the pump (such as GB3215 and API610 Eighth Edition), static balance Of the rotor conditions are as follows: 1) For a single-stage pump, two-stage pump rotor, where the working speed <1800 rev / min, regardless of D / b <6 or D / b ≥ 6 only static balance. Do dynamic balance , You must ensure that D / b <6, or only static balance. 2) For single-stage pump, two-stage pump rotor, where working speed ≥ 1800 rev / min, However, after the balance of the remaining unbalance to be equal to or less than the allowable unbalance of 1 / 2. If required to do dynamic balance depends on the balance of the two correction planes can be separated in the balancing machine, if the separation is not open, You can only do static balance 3) For some open impeller rotor, if you can not achieve both ends of the support, only static balance can be.Because the two ends can not support, is bound to be cantilevered, so balancing balancing machine is very dangerous , Can only be carried out in the balance frame single (static) balance 4, the conditions for the rotor to do dynamic balance In the GB9239 standard states: "Where the rigid rotor if you can not meet the static equilibrium disk rotor conditions, you need to do two A plane to balance, that is, dynamic balance. "Only static balance of the rotor conditions are as follows (static equilibrium G0.4 for the highest precision, under normal circumstances, choose dynamic balance of pump impeller G6.3 or G2.5): 1) for single-stage pump, two Rotor of the grade pump, when working speed is greater than or equal to 1800r / min, as long as D / b <6, should do dynamic balance 2) For multistage pump and combined rotor (3 or above), no matter how many working speed , Should be combined rotor balancing.