Large vertical electromotor for third-generation nuclear power plant sea water circulating pump

Abstract

The invention relates to a large vertical electromotor for a third-generation nuclear power plant sea water circulating pump. The largest domestic vertical asynchronous motor fills the domestic blank. The highest thrust borne by the 7700kW vertical asynchronous motor with 36 poles is 280 tons. A push-guide integral structure is adopted in an upper bearing, and a high pressure oil ejection device is arranged when the motor is started. A self-cooling mode is adopted in a lower guide bearing, and a cooling waterway is removed. An upper machine frame and a lower machine frame are respectively in a structure of extending into a machine base, the axial distance is shortened, and a cooling air path is further optimized. Meanwhile, the structure of a rotor is improved, and the influence of a hot expansion on safe operation of the rotor is effectively avoided. The large vertical electromotor for the third-generation nuclear power plant sea water circulating pump improves the import substitution rate of a third-generation pressurized water reactor nuclear power unit AP1000, and a solid foundation is laid for research and design of a major and special national project CAP1400. The large vertical electromotor for the third-generation nuclear power plant sea water circulating pump is low in rotating speed and high in power, and the thrust is high. The electromotor is particularly applied to the field of third-generation nuclear power plant sea water circulating pumps.

Description

technical field [0001] The invention relates to a large-scale vertical motor for a seawater circulating water pump of a third-generation nuclear power plant. Background technique [0002] When selecting the seawater circulating water pump unit of the third-generation nuclear power plant, on the premise of meeting the water supply performance, the main considerations are the safe operation of the equipment, convenient installation and maintenance, and low manufacturing and operating costs. Machine three pump two schemes. The larger the number of supporting units, the larger the occupied area. In addition to being unsuitable for layout, the investment cost of the equipment is also high, and the more the number of units, the more supporting valves, which increases the probability of failure. Therefore, it is the trend of choice for nuclear power plant circulating water pump units to choose fewer sets. The reduction in the number of circulating pump units will inevitably incre...

AI Technical Summary

Problems solved by technology

Due to the high power, low speed, and high thrust, the motor has the following problems: 1. The volume of the motor is too large; 2. The ventilation of the motor is difficult; 3. The pressure-bearing parts of the motor require high rigidity; 4. Thermal expansion has a great impact on the structure of the motor

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