Steam turbine rotor

Abstract

The invention discloses a steam turbine rotor, which comprises a main shaft and impellers in all stages, wherein the main shaft and the impellers in all stages are in a sheathing structure, the outer surface of the main shaft is provided with external assembly surfaces for assembling the impellers in all stages and is in a step shape, the impellers in all stages are assembled on the corresponding external assembly surfaces of the main shaft through respective annular inner assembly surfaces , the each-stage external assembly surfaces arranged on the main shaft respectively have certain conicity, the inner assembly surfaces of the impellers in all stages have the matched and consistent conicity with the conicity of the corresponding eternal assembly surface on the main shaft, the impellers in all stages and the main shaft form the conical surface assembly, and the self locking is realized. The steam turbine rotor has the advantages that the main shaft and the impellers form the assembly through the conical surface, the reverse pull type self locking of the impeller is realized on the main shaft, the assembly is firm and reliable, the loose sliding of the impellers on the main shaft is effectively avoided, a positioning key is not needed for the positioning locking, all defects cased by the positioning key are eliminated, the production cost is effectively controlled, the safety of the rotor is high, and the service life is long.

Description

technical field [0001] The invention relates to a steam turbine, in particular to a steam turbine rotor. Background technique [0002] The steam turbine rotor is the general term for the rotating part of the steam turbine, which is used to collect the mechanical energy obtained from the moving blade cascades at all levels and transmit the mechanical energy to the generator rotor. According to the combination of main shaft and impeller, the existing steam turbine rotors are divided into integral forged rotors, sleeved rotors, welded rotors and combined rotors. Among them, the sleeved rotors are easy to forge, easy to process and short in processing cycle. Medium and low voltage parts have been widely used. [0003] see figure 1 : The conventional packaged rotor includes the main shaft A and impellers B at all levels. The outer surface of the main shaft A is provided with an outer assembly surface for assembling the impellers B at each level. The outer assembly surface is a ...

AI Technical Summary

Problems solved by technology

This method has the following main defects: 1. It is necessary to process the assembly grooves of the positioning keys on the end faces of the outer assembly surfaces of all levels on the main shaft and the end surfaces of the inner assembly surfaces of the impellers at all levels, which directly increases the processing difficulty of the main shaft and impellers, seriously The processing efficiency of the main shaft and impeller is affected, and the production cost of the enterprise is high; 2. The assembly groove of the positioning key is bound to cause damage to the stress of the main shaft and the impeller, thereby reducing the strength of the main shaft and the impeller; 3. The assembly parts of the rotor increase, further Increase the production cost of the enterprise; 4. The assembly relationship of the rotor is complicated, the assembly efficiency is low, and the assembly requirements are strict (especially the assembly clearance requirements), and the assembly is difficult; 5. The firmness and reliability of the assembly are poor, and it is loose on the main shaft After the impeller is affected by the steam force, it will slide axially. Although the positioning key can stop it, it is very limited, and the sliding impeller can easily cut off the positioning key, which still poses a great safety hazard.

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