Method for assembling moving blades on steam turbine rotor

Abstract

The invention provides a method for assembling moving blades on a steam turbine rotor. All the moving blades on the steam turbine rotor are standard blades. The method for assembling all the moving blades comprises the steps of 1, arranging a wedge block used for positioning the blade root of the first blade in a slot of a rim of a steam turbine rotor wheel; 2, positioning all the moving blades in the slot one by one, and arranging a gasket between every two adjacent moving blades; 3, replacing all the gaskets with spacing pieces to make one spacing piece inserted between every two adjacent moving blades in the whole circuit of moving blades, so that assembly of the moving blades is achieved. The whole circle of moving blades can be standard blades, extra design of a final blade is not needed, an installation groove does not need to be formed in the rim of the steam turbine rotor wheel, installation of the whole circle of moving blades can be achieved through the gaskets and the spacing pieces, design cost is reduced, and the cost for manufacturing the whole circle of moving blades and the rim of the steam turbine rotor wheel is reduced.

Description

technical field [0001] The invention relates to the technical field of steam turbine rotor manufacturing, in particular to a method for assembling moving blades on a steam turbine rotor. Background technique [0002] As the core power device of the power station, the steam turbine is a rotary power machine that converts the energy of steam into mechanical work. It is mainly used as a prime mover for power generation, and can also directly drive various pumps, fans, compressors and ship propellers. It is also possible to use the exhaust steam or intermediate steam extraction of the steam turbine to meet the heating needs of production and life. [0003] In a steam turbine, the thermal energy of steam is efficiently converted into mechanical energy through moving blades and rotors. The moving blades are installed on the rotor impeller or drum, accept the high-speed airflow from the nozzle cascade, convert the kinetic energy of the steam into mechanical energy, and make the r...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the assembly method of installing the moving blades to the rotor impeller is to rotate the moving blades at a certain angle, so that the blade root of the moving blade can be inserted into the wheel groove of the impeller rim, and the blade root can be inserted into the wheel groove Finally, the moving blade is rotated back to the predetermined angle; this installation method makes the final blade have no extra space to rotate when it is finally installed, so it is necessary to open an installation groove in the axial direction on the impeller rim, so that the installation groove and The wheel grooves are connected, and the final blades are directly inserted into the wheel grooves from the installation grooves. The pins are used to axially position the final blades. It is necessary to open threaded grooves on the blade roots, so that the final blades need to be specially designed, which not only increases the workload of the design of the moving blades Large size, high manufacturing cost, and installation grooves need to be processed on the impeller rim, so that the manufacturing cost of the impeller rim is also high

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