Air-cooled turbogenerator stator frame assembling and welding method

Abstract

The invention provides an air-cooled turbogenerator stator frame assembling and welding method. The air-cooled turbogenerator stator frame is composed of three parts of a middle-section frame (1), a turbine-end frame (2) and an excitation-end frame (3), the three parts carry out assembling and welding respectively, and then, final assembling is carried out. According to the structural characteristics of the stator frame in a new structure, a composite assembly method with vertical assembly and horizontal assembly combined is adopted, the assembling and welding quality of the stator frame is improved, and the operation and the construction are convenient; section assembling and welding are carried out for the stator frame, each section operates independently, parallel assembling and welding are realized, the construction period is shortened, and the assembling and welding efficiency is improved; and the stator frame baseboard is used as an assembly reference, the concentricity accuracy requirements of the whole frame body are ensured, and high-precision assembly of the stator frame is realized.

Description

technical field [0001] The invention relates to a method for assembling and welding a stator frame of a steam turbine generator. Background technique [0002] The air-cooled generator stator frame is difficult to design in order to achieve reverse ventilation and meet the electrical mechanical performance and transportation restrictions. Due to the structural space limitation, the generator stator frame adopts a three-stage structure (middle section frame, steam end frame, excitation end frame ), the plane on the stator base is three intersecting planes at 135 degrees, which are used for the joint connection of the top cover of the base. The assembly size accuracy of the three planes needs to be precisely controlled by welding technology to meet the smooth assembly of the top cover of the base in the later stage ; The structural characteristics of the stator frame of the air-cooled turbogenerator, if the previous welding process is used, it will not be able to meet the dimen...

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Problems solved by technology

[0002] The air-cooled generator stator frame is difficult to design in order to achieve reverse ventilation and meet the electrical mechanical performance and transportation restrictions. Due to the structural space limitation, the generator stator frame adopts a three-stage structure (middle section frame, steam end frame, excitation end frame ), the plane on the stator base is three intersecting planes at 135 degrees, which are used for the joint connection of the top cover of the base. The assembly size accuracy of the three planes needs to be precisely controlled by welding technology to meet the smooth assembly of the top cover of the base in the later stage ; The structural characteristics of the stator frame of the air-cooled turbogenerator, if the previous welding process is used, it will not be able to meet the dimensional accuracy requirements of the frame, which will affect the normal use of the generator; if the ring plate of the frame is not a full circle structure, it cannot The traditional layer-by-layer assembly and welding process is adopted, and the concentricity of the inner circle of the ring plate and the dimensional accuracy of the three planes intersecting at 135 degrees on the upper plane of the machine base are taken into account during the assembly process; there are few supporting ribs inside the machine base, and the overall rigidity of the machine base The welding deformation is difficult to control, such as the process of welding the outer skin after welding the frame frame, which is no longer suitable for the welding process of the stator frame of the air-cooled generator

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