Center Guide Pin Design for Steam Turbine Diaphragm Alignment
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Solution Overview
Problem
The existing method for positioning a diaphragm in a rotary machine, such as a steam turbine, requires multiple temporary assemblies to adjust the center guide pin, leading to time-consuming and labor-intensive alignment processes.
Innovation Solution
A design method for a center guide pin that involves three-dimensional measurements to determine virtual center axes and offset amounts for both the casing and diaphragm, allowing for precise design and manufacturing of the guide pin to ensure accurate alignment without repeated assembly, and an assembling method that fixes the guide pin to the casing and fits it into the diaphragm's groove portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the center guide pin is adjusted by multiple temporary assemblies to achieve accurate positioning, then the positioning precision of the diaphragm is improved, but the assembly time and labor effort increase significantly
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-positioning the center guide pin at the correct offset position from the center of the casing during manufacturing. This preliminary positioning eliminates the need for multiple temporary assemblies and adjustments during the actual assembly process, as the diaphragm can be directly positioned accurately in a single assembly operation.
2Manufacturing precision
If the center guide pin is adjusted by multiple temporary assemblies to achieve accurate positioning, then the positioning precision of the diaphragm is improved, but the labor effort and complexity of the assembly process increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-positioning the center guide pin at the correct offset position from the center of the casing during manufacturing. This preliminary positioning eliminates the need for multiple temporary assemblies and adjustments during the actual assembly process, as the diaphragm can be directly positioned accurately in a single assembly operation.
3Manufacturing precision
If the diaphragm is moved repeatedly during assembly adjustments, then the positioning accuracy is improved, but the work efficiency decreases
Solution Approach 1:
The patent applies preliminary action by pre-calculating the correct position of the center guide pin relative to the casing center and fabricating the guide pin at this predetermined offset position before assembly. This allows the diaphragm to be positioned accurately in a single assembly operation without repeated movements, thereby maintaining high work efficiency while achieving precise alignment.
Data Source
AI summary
A design method of a center guide pin includes a step of setting a virtual center axis of a casing, a step of acquiring a center position of the center guide pin in a horizontal direction, a step of acquiring, as a first offset amount, an offset amount of the center position of the center guide pin from the virtual center axis of the casing in the horizontal direction, a step of setting a virtual center axis of a diaphragm, a step of acquiring a center position of a groove portion in the horizontal direction, a step of acquiring, as a second offset amount, an offset amount of the center position of the groove portion from the virtual center axis of the diaphragm in the horizontal direction, and a step of designing the center guide pin based on the first offset amount and the second offset amount.