Adjustable water-turbine generator set cooling fan and blade adjusting method thereof

Abstract

The invention discloses an adjustable water-turbine generator set cooling fan which comprises a fan center, blades, operating force arms, driving pins and synchronous operation rings. A pivot is arranged at one end of each blade, a plurality of first through holes are circumferentially formed in the fan center, the end of each pivot is connected with one end of the corresponding operating force arm through a cylindrical pin after the pivot penetrates the corresponding first through hole, and the other end of the operating force arm is connected with the corresponding synchronous operation ring through the corresponding driving pin. Special bearing bushes are arranged among the pivots and a shaft hole of the fan center to accurately position and decrease an operating torque, one end of each operating force arm is clamped on the pivot of the corresponding blade, mounting and adjusting are facilitated when reliable operations are ensured, the other end of the operating force arm is connected with the corresponding synchronous operation ring through the corresponding driving pin, the synchronous operation rings slightly move along the axis direction of a generator shaft to drive the operating force arms to rotate around axes of the pivot of the blades, and mounting angles of the blades are changed.

Description

technical field [0001] The invention relates to a cooling fan, in particular to an adjustable cooling fan of a water turbine generator set and a method for adjusting blades thereof. Background technique [0002] During the operation of the generator of the hydroelectric generator set, a large amount of heat is generated due to electromagnetic, mechanical friction and other reasons. The generation of heat causes the size of the unit to increase, and the uneven heat distribution causes large thermal stress in the rotor or stator. During the frequent start-up and shutdown of the unit, the temperature and thermal expansion coefficient of the copper conductor and the outer insulation are different, resulting in fatigue, which in turn causes insulation. destruction. The existence of heat not only reduces the efficiency of the generator, but also endangers the stability and safety of the generator operation and shortens the service life of the generator set. [0003] Common gener...

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Problems solved by technology

Hydrogenerator units often undertake the task of peak regulation and frequency regulation, and the annual full-fire hours account for a small proportion of the annual operating hours. In addition, the annual average room temperature is much lower than the summer daytime maximum temperature, so this kind of fan has excessive design redundancy. In addition, the wind resistance is large, which affects the improvement of the power generation efficiency of the generator set

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