Rotary Machine Casing Pressing Support Mechanism
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Solution Overview
Problem
In conventional gas turbines, the outer peripheral edge of the intermediate shaft cover, which supports the combustor, becomes hot during operation and seizes when trying to loosen bolts for maintenance, making it difficult to detach the upper casing.
Innovation Solution
A rotary machine design featuring a half-split outer and inner casing configuration with a pressing support mechanism that eliminates screw engagement between the casings, allowing easy detachment by canceling the press support or applying a radial load, and includes a rotation stop mechanism to prevent unintended disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer peripheral edge portion of the intermediate shaft cover is fit into the fitting portion of the upper casing and fixed with bolts, then the combustor can be supported and fixed, but the screw portion of the bolt seizes due to high temperature during operation, making it difficult to loosen the bolt for maintenance
Solution Approach 1:
The invention extracts the pressing support function from the bolt connection system. The pressing support mechanism is implemented as a separate component (pressing support mechanism 71) that independently provides the necessary pressing force, allowing the bolt connection to be simplified and avoiding the seizure problem that occurs when bolts are subjected to both connection and pressing functions under high temperature conditions.
Solution Approach 2:
The invention segments the functions of the intermediate shaft cover and upper casing connection system. The pressing support mechanism is separated as an independent functional component, distinct from the bolt connection system. This segmentation allows the pressing function to be provided without requiring the bolts to withstand both connection and pressing loads, thereby preventing seizure and enabling easy maintenance.
2Stability of the object's composition
If bolts are used to fix the intermediate shaft cover and upper casing, then the structure is stable and reliable, but the detachment process becomes complex and time-consuming due to seized bolts
Solution Approach 1:
The pressing support function is extracted from the bolt connection system and implemented as a separate pressing support mechanism. This allows the bolt connection to be simplified to only provide connection function, while the pressing force is provided independently, enabling quick detachment without dealing with seized bolts and significantly reducing maintenance time.
Solution Approach 2:
The pressing support mechanism is designed to be engaged and disengaged easily before and during maintenance operations. By having the pressing support function separated and controllable, the system allows for preliminary engagement to ensure stability during operation, and quick disengagement to facilitate rapid maintenance access without the time loss associated with dealing with seized bolts.
Data Source
AI summary
In a rotary machine, a method of assembling a rotary machine, and a method of performing maintenance of a rotary machine, a combustor casing as an outer casing configured from upper and lower casings defining a half split shape, an intermediate shaft cover as an inner casing configured from upper and lower casings defining a half split shape and supporting a combustor in the combustor casing, and a pressing support mechanism configured to press and support a portion to be fit of the combustor casing and a fitting portion of the intermediate shaft cover in an axial direction of a rotor are included.