Quasi-planetary speed reduction box of cooling water pump of nuclear power station

Abstract

The invention relates to the technical field of speed reduction of nuclear power stations, in particular to a quasi-planetary speed reduction box of a cooling water pump of the nuclear power station. The cooling water pump of the Daya Bay nuclear power station adopts a planetary gear reducer of Rolls-Royce Ltd., UK. The design service life is 100,000 hours. Tooth breaking exists in a planetary gear after the accumulated running time of a reduction gear box of a No.2 circulation water pump of a No.1 unit achieves 44000 hours. Therefore, the design of the speed reduction box of the water pump with the high reliability has very important economic valve for ensuring the normal running of the nuclear power station. The quasi-planetary speed reduction box is technically characterized by adopting a single-stage quasi-planetary structure which carries out split twice in a plane: (input) central gear-two second intermediate wheels-(output) inner gear ring. As a planetary carrier is fixed during the quasi-planetary transmission, the vibration is smaller than that during the planetary transmission. The power split number is 2 multiplied by 4. The quasi-planetary speed reduction box has the benefits of straight teeth and quality adjustment of the inner gear ring, small machining process difficulty, low cost, and large carrying capacity.

Description

【Technical field】 [0001] The invention relates to the technical field of deceleration in nuclear power plants, and relates to a quasi-planetary reduction box for cooling water pumps in nuclear power plants. 【Background technique】 [0002] Daya Bay nuclear power The station is equipped with 4 circulating cooling water pumps, and a planetary gear reducer produced by the British Rolls-Royce Company is installed between the motor and the water pump. The planetary gear reducer includes a sun gear, 4 planetary gears and two ring gears, symmetrical double helical gear transmission. The rated mechanical power of the planetary gear reducer is 4498kW, the maximum transmission torque is 266353N.m, the rated input speed is 744r / min, the rated output speed is 161r / min, the reduction ratio i=4.62, and the designed service life is 100,000 hours. January 9, 1998, Daya Bay nuclear power When unit 1 of the station was running at high power, the planetary gear of the deceleration gearbox of...

AI Technical Summary

Problems solved by technology

January 9, 1998, Daya Bay nuclear power When unit 1 of the station was running at high power, the planetary gear of the deceleration gearbox of the circulating water pump No. 2 suddenly broke, causing the pump unit to stop and the generator unit to reduce power. ACCIDENT , causing major economic losses to the power station

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