Rotatable Center Guide Pin for Steam Turbine Partition Plate Alignment
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Solution Overview
Problem
Existing steam turbine assembly methods face challenges due to dimensional errors in groove portions and attaching holes, leading to increased component numbers and worker burden, as guide pins need to be customized for each error type and require complex processing.
Innovation Solution
A center guide pin system with adjustable abutment portions that change position by rotating around a vertical axis, allowing for precise horizontal alignment of the partition plate with respect to the casing without needing multiple guide pin types, using a tubular or circular cross-section with offset central axes to create multiple abutment distances, and incorporating a pin base with a penetration hole for easy rotation and fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple types of guide pins are prepared to correspond to dimensional errors, then positioning precision is improved, but the number of components increases
Solution Approach 1:
The guide pin is designed with a positioning portion that can assume multiple positions around the pin axis, allowing a single guide pin type to accommodate various dimensional errors. The positioning portion includes multiple abutment portions at different radial distances from the pin axis, enabling the same guide pin structure to function for different positioning requirements without needing multiple specialized pin types.
Solution Approach 2:
The guide pin incorporates a rotatable positioning portion that can dynamically adjust its orientation around the pin axis. This rotational capability allows the positioning portion to be oriented in different directions to match various groove portion positions, transforming a static component into a dynamically adjustable one that adapts to different positioning scenarios.
2Manufacturing precision
If guide pins are processed (overlay welding, cutting or the like) to be adjusted, then positioning precision is improved, but the burden on the assembling worker increases
Solution Approach 1:
The guide pin is manufactured with a positioning portion that already includes multiple abutment portions at predetermined radial distances from the pin axis. This preliminary preparation during manufacturing eliminates the need for field adjustments through welding or cutting, as the component is pre-configured to handle various positioning scenarios.
Solution Approach 2:
The positioning portion is segmented into multiple discrete abutment portions that can independently engage with the groove portion. This segmentation allows the positioning function to be divided into multiple fixed positions, eliminating the need for continuous adjustment processes like welding or cutting during assembly.
3Device complexity
If the positioning portion is fixed without rotation capability, then the structure is simpler, but adaptability to dimensional errors is reduced
Solution Approach 1:
The positioning portion is designed to rotate around the pin axis, transforming a static structure into a dynamic one. This rotational capability allows the same simple guide pin structure to adapt to various dimensional errors by orienting the positioning portion in different directions, maintaining structural simplicity while enhancing adaptability.
Data Source
AI summary
A steam turbine includes a rotor, a casing, a partition plate, and a center guide pin. The center guide pin has a positioning portion. In a state of being attached to a pin attachment portion formed in one of the casing and the partition plate, the positioning portion is disposed in a groove portion formed in the other of the casing and the partition plate. The positioning portion includes a plurality of abutment portions capable of abutting on an inner side surface of the groove portion, around a pin axis. The plurality of abutment portions is formed to have different horizontal distances from the pin axis.