Steam turbine partition board assembly process

Abstract

The invention discloses a steam turbine partition board assembly process. A steam turbine partition board is mainly composed of a partition board body, a plurality of guide blades and a partition board outer ring. Each guide blade is mainly composed of an inner edge plate, a blade body and an outer edge plate. The partition board assembly process comprises the following technological steps of machining assembly surfaces of the edge plates of the guide blades to be smooth and free of welding groove structures; assembling the inner edge plates of the guide blades to the periphery of the partition board body in sequence to enable the guide blades to form a blade grid on the periphery of the partition board body, and assembling the partition board body and the blade grid an assembly combined body; conducting assembly treatment on the partition board outer ring and the assembly combined body; assembling the assembled partition board outer ring to the assembly combined body in a shrinkage assembly mode to enable the partition board outer ring to be located at the outer edge plates of the blade grid of the assembly combined body and obtaining the steam turbine partition board accordingly.The steam turbine partition board assembly process is little in assembly technical difficulty and has the characteristics of being short in assembly period, high in assembly efficiency, low in manufacturing cost, high in assembly precision and the like.

Description

technical field [0001] The invention relates to a forming technology of a steam turbine partition, in particular to an assembly process of a steam turbine partition. Background technique [0002] The steam turbine diaphragm is the partition wall of the various stages in the steam turbine. It is mainly composed of a diaphragm body, a plurality of guide vanes (ie, stationary vanes) and the outer ring of the diaphragm. The two ends of the blade body of the guide vane have inner and outer edge plates. , that is, the guide vane is a self-contained crown structure. [0003] The assembly of the steam turbine diaphragm is to combine the diaphragm body, multiple guide vanes and the outer ring of the diaphragm to form a whole. [0004] see figure 1 and figure 2 As shown, the assembly process of the existing steam turbine diaphragm is to process a welded groove structure on the edge plate assembly surface of each guide vane 2 first, and the welded groove structure is at the matchin...

AI Technical Summary

Problems solved by technology

From this assembly process, it can be clearly seen that the assembly process of the existing steam turbine diaphragm not only needs to open a welding groove on the assembly surface of each guide vane, but also has many assembly processes. These technical measures will directly lead to a significant increase in the assembly cycle of the steam turbine diaphragm. lengthening, manufacturing inefficiencies, and substantially increasing the manufacturing cost of steam turbine diaphragms

In addition, the existing steam turbine diaphragm assembly process has a welding process for the cascade composed of multiple guide vanes. The welding process of the cascade is likely to cause a large deformation of the entire cascade due to welding, so that the assembly size of the cascade It is difficult to guarantee, which will directly affect the assembly accuracy and molding quality of the partition

[0005] To sum up, the existing assembly process of steam turbine diaphragm has technical problems such as long cycle, low efficiency, high cost, unstable molding quality, etc.

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