On-site dynamic balance method of vertical water pump

Abstract

An on-site dynamic balance method of a vertical water pump adds a wheel disc, serving as an on-site high-speed dynamic balance weight increasing plane, at a motor rotation shaft end part exposed outside a fan at the top of the motor; at first obtain original vibration data of four measuring points of the vertical water pump, then select a proper weight increasing manner, obtain the influence coefficient after each measuring point tries to increase counter weight according to the selected weight increasing method, and later on, obtain the counter balance, which is supposed to be increased and corresponding to each measuring point, so as to carry out on-site dynamic balance to the vertical water pump according to the influence coefficient after each measuring point tries to increase the counter weight and the original vibration data of each measuring point. By means of adding a wheel disc used for dynamic balance at a motor shaft neck so as to enrich the on-site dynamic balance processing means of the vertical water pump under the condition of not disintegrating the motor, the method improves the success rate of solving the vertical water pump vibration problem through the on-site dynamic balance, increases the efficiency of solving vibration fault by a large margin, and guarantees the safe operation of equipment so as to reduce loss for an enterprise.

Description

technical field [0001] The invention belongs to the field of industrial production, and in particular relates to an on-site dynamic balancing method for a vertical water pump. Background technique [0002] A large number of vertical water pumps are used in industrial sites. The motor is located at the top and the water pump is located at the bottom. The two are connected by a coupling. The motor is located on the pump body and the coupling bracket shell. Due to structural limitations, this type of pump set often has low dynamic stiffness and structural resonance, so it is prone to vibration problems, mainly manifested in the very large vibration of the top motor, which is one of the most common problems in large rotating equipment in industrial sites. Vibration exceeding the standard will endanger the safety of the equipment and force the equipment to fail to operate normally. If the equipment is an important link in the system, it may affect the normal production of the ent...

AI Technical Summary

Problems solved by technology

Because the balance weight on the coupling is not installed at the most vibrating (most sensitive) position, the aggravation sensitivity is low and the aggravation weight will be relatively large. Excessive aggravation weight will cause contradictions between measuring points on different planes, that is, two The vibration data of measuring points on one or more planes are contradictory, reducing the vibration of one plane will increase the vibration of another plane, which will bring certain side effects

In this case, there is a possibility that a suitable weighting scheme cannot be found through the limited weighting surface, and this situation is also very common when dealing with vibration problems in industrial sites, which directly leads to the inability of this dynamic balancing method to balance all The amplitude of the measuring point is reduced to a safe operating range

[0007] The on-site treatment method for vibration faults of large vertical pump sets has great limitations. A large number of cases show that the installation is usually repeatedly adjusted but the effect is not good. The problem of conflicting vibration data, there may also be vibrations at certain positions that are very insensitive to the response of the coupling plane aggravation (these positions are generally located far away from the coupling, such as the non-drive end of the water pump and motor), That is to say, after a certain counterweight is applied, the amplitude of these positions changes very little, and it is impossible to apply a larger counterweight on the coupling. At the same time, excessive counterweight will inevitably have a negative impact on the vibration of other positions, which also leads to Unable to reduce the amplitude of the target survey point to a satisfactory level

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