Steam Turbine Upper Half Assembly Positioning
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Solution Overview
Problem
The existing steam turbine assembly methods face challenges in accurately positioning the upper and lower half assemblies, leading to potential gaps due to slight deviations, and require excessive adjustment, which increases the complexity and cost of the assembly process.
Innovation Solution
A steam turbine assembling method that includes preparing upper and lower half casings and partition plates with defined surfaces and recesses, allowing for precise alignment and assembly through the use of abutment members and recessed portions, enabling accurate positioning and minimizing the need for extensive adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the position of the casing and partition plate is completely fixed, then positioning precision is improved, but the ability to absorb assembly deviation is reduced, leading to gap formation between upper and lower half assemblies
Solution Approach 1:
The partition plate is designed to be movable relative to the casing in the vertical direction through a regulating structure (support piece and support groove). This dynamic design allows the partition plate to automatically adjust its position to absorb assembly deviations between upper and lower half assemblies, while the screw mechanism provides precise positioning capability when needed.
2Manufacturing precision
If extensive adjustment is performed to eliminate gaps, then assembly precision is improved, but assembly complexity and time are increased
Solution Approach 1:
The regulating structure enables the partition plate to self-adjust its position automatically during assembly by utilizing the support piece and support groove mechanism. This self-service capability eliminates the need for extensive manual adjustment operations, reducing assembly complexity and time while achieving high assembly precision.
3Adaptability or versatility
If the partition plate is made movable to absorb deviation, then adaptability is improved, but positioning stability is reduced
Solution Approach 1:
The system transitions between dynamic and static states: during assembly, the partition plate is movable to absorb deviations; after assembly, the screw mechanism locks the partition plate in position to provide stability. This dynamic design maintains both adaptability during assembly and stability during operation.
Solution Approach 2:
The screw mechanism acts as an intermediary between the movable partition plate and the fixed casing. It provides precise positioning control and locking capability, enabling the system to achieve both movability for deviation absorption and stability for final positioning.
Data Source
AI summary
A steam turbine assembling method includes an upper half assembling step of, after disposing an upper half partition plate having an upper half partition plate division surface on the inner peripheral side of an upper half casing having an upper half casing division surface, attaching an upper half position defining portion to the upper half casing and the upper half partition plate so as to form an upper half assembly, and a lower half assembling step of disposing a lower half partition plate having a lower half partition plate division surface capable of abutting against the upper half partition plate division surface on an inner peripheral side of a lower half casing having a lower half casing division surface capable of abutting against the upper half casing division surface so as to form a lower half assembly.