Manufacturing method of assembled stationary blade partition plate of rotary drum steam turbine

Abstract

The invention discloses a manufacturing method of an assembled stationary blade partition plate of a rotary drum steam turbine. The manufacturing method comprises the following steps: a partition plate sleeve is divided into m assembly groups, a positioning ring is arranged on at least one end surface of an outer ring of each stationary blade, and the circumferential assembly surface of each stationary blade is of a plane structure through which a radiation ray passes; the stationary blades in each assembly group comprise standard stationary blades and thickened-pitch stationary blades, grooves are machined in the front end surface and the rear end surface of the inner circle of the inner ring of the stationary blade to be assembled in the middle of each assembly group, and grooves are machined in the end surface, facing the stationary blades in the same assembly group, of the inner circle of the inner ring of the stationary blade to be assembled at the end of each assembly group; anda plurality of stationary blades are sequentially arranged in each assembly group and are fixed, the stationary blades in each assembly group are welded, and every two adjacent assembly groups are notwelded, so that the assembly of a first-stage partition plate is completed. According to the manufacturing method, tedious and redundant manufacturing procedures can be greatly reduced, the manufacturing period is shortened, the cost is reduced, and the assembly efficiency is improved.

Description

technical field [0001] The invention relates to the field of drum type steam turbine diaphragm design, in particular to a method for manufacturing a drum type steam turbine assembled stationary vane diaphragm. Background technique [0002] Because the traditional rotary drum steam turbine has no impeller, the diaphragm is directly set on the inner wall of the diaphragm sleeve. The diaphragm is processed by welding a certain number of single stator blades with inner and outer rings into a complete circle. . [0003] The processing and assembly process of the partition is as follows: (1) Process a single stator vane with its own inner and outer rings separately; (2) According to the calculation quantity requirements, use special tooling to assemble, adjust, and position it into a circle. 1. Process the welding ring groove on the circumference of the outer ring, and process the welding joint at the grouping of each blade; (3) Weld the adjusted whole circle of static blades at ...

AI Technical Summary

Problems solved by technology

[0004] To sum up, it can be seen that the processing procedure of the partition is cumbersome and the cycle is long; due to the large amount of welding of the welding ring groove and the welding joints of each group, special tooling is required, and the welding performance is easily affected by welding methods, materials, errors, etc., which is not ideal; In addition, there is no bulkhead suspension and other adjustment and positioning structures, which makes it extremely difficult to find the center of the rotor during assembly.

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