Large-sized turbine generator shaft bushing and method for machining bore of shaft bushing

Abstract

The invention discloses a large size turbo generator bush and a bore processing method, wherein the bore of the upper and the lower bush has an eccentric circle with the diameter a, the center distance of the inner semicircle of the upper bush has a distance delta from the joint surface, the center distance of the inner semicircle of the lower bush has a distance eta from the joint surface. The center of the oil wedge is arranged on the joint surface of the lower bush and the superficial diameter is b. The bore process of the bush has the following steps: processing the base level of the upper and the lower bush; revising the verticality of the joint surface of the upper and the lower bushes and the base level; assembling the upper and the lower bushes, using the center of the joint surface as the centre of a circle and processing the inner bore of the bush with the diameter b; disconnecting the upper and the lower bushes, underlaying a pad with the thickness delta plus eta between the joint surface, then assembling the upper and the lower bushes; finding out the symmetric center O, then adjusting the eccentricity and finding our the processing center O', at last processing the bush inner circle with the center O' as the processing center.

Description

technical field [0001] The invention relates to a processing method for a bearing bush of a generator, in particular to a method for processing an inner hole of a bearing bush of a steam turbine generator. technical background [0002] The 390KW gas turbine generator is an F-class heavy-duty gas turbine generator with the most advanced technology in the world today. Under the same power generation, the carbon dioxide gas emission of the F-class gas turbine GTCC combined cycle system is about 42% of that of a coal-fired power plant. Nitrogen oxide emissions are less than 20% of coal-fired power plants, emissions of sulfur dioxide gas and ash are equivalent to 1% to 3% of coal-fired units with the same power generation, and water consumption is equivalent to 33% of coal-fired units with the same power generation. The plant covers an area equivalent to 54% of the coal-fired units with the same power generation capacity, so it has the characteristics of less pollution and less r...

AI Technical Summary

Problems solved by technology

In the prior art, the upper and lower bearing bushes are processed separately, which requires a special car mold for processing. The car model must have high precision to ensure the eccentric value, and there will be large errors in the clamping and fixing of the bearing bushes. The symmetry and perpendicularity between the surface and the reference plane are extremely demanding, so how to process the inner hole of the bearing bush has become a subject of intensive research by the industry.

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