Method for controlling blade top clearance of ORC (organic Rankine cycle) turbine unit

Abstract

The invention discloses a blade top clearance control method for an ORC (organic Rankine cycle) turbine unit, the ORC turbine unit comprises a bearing box, an air inlet volute, a flow guide casing, a stator assembly composed of a first-stage stationary blade casing and a second-stage stationary blade casing, and a rotor assembly composed of a main shaft, a first-stage bladed disc and a second-stage bladed disc, the rotor assembly is arranged in the stator assembly, and the main shaft is arranged in the stator assembly. The blade top gaps are the gaps between the first-stage stationary blade machine shell and the top of the first-stage blade disc and between the second-stage stationary blade machine shell and the top of the second-stage blade disc. The control method for the blade top clearance specifically comprises the steps of judging whether the calculation clearance of the blade top clearance conforms to the design clearance or not, drilling and reaming positioning pin holes of two adjacent components in the stator assembly, and removing the machining allowance of the first stationary blade shell and the second stationary blade shell. By means of the means, the phenomenon that the blade top clearance does not meet the requirement due to axial dimension chains and radial dimension chains of the rotor assembly and the stator assembly is effectively avoided, and the one-time installation qualification rate of the ORC turbine unit is guaranteed.

Description

technical field [0001] The invention relates to the technical field of compressors, in particular to a method for controlling blade tip clearance of an ORC turbine unit. Background technique [0002] The organic Rankine Cycle (ORC) turbine unit has a cone clearance fit between the rotor assembly and the stator assembly. During the manufacturing process, if there is a deviation between the axial dimension chain and the radial dimension chain of the rotor assembly or the stator assembly, the gap between the stator assembly and the rotor assembly will change. Deviations in the coaxiality between the components of the rotor assembly and the stator assembly after assembly can also result in uneven clearances. In the past, the conventional assembly method used the matching gap method, that is, after the components of the turbine unit were assembled, the gap between the rotor assembly and the stator assembly was measured, and the rotor assembly or stator assembly was ground accord...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a method for controlling blade tip clearance of an ORC turbine unit, which solves the technical problem that the ORC turbine unit cannot meet the needs of industrialized production caused by low assembly efficiency in the prior art

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