Turbomachine Half-Shell Casing With Tab-Chute Blocking System
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Solution Overview
Problem
The maintenance and inspection of turbomachines with inlet guide vanes (IGVs) having variable settings are complicated due to the complex architecture, particularly in engines with a reduction mechanism between the low-pressure shaft and the fan.
Innovation Solution
A turbomachine assembly featuring a row of IGVs with an outer and inner casing made of half-shells, a structural casing with a cylindrical flange, and a blocking system comprising a tab and chute to securely attach the inner casing to the structural casing, allowing for easy dismounting and remounting during maintenance or inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional mounting method using clamps and nuts is used to fix the outer casing to the structural casing, then the structural integrity and reliability of the assembly is improved, but the device complexity and difficulty of maintenance increase significantly
Solution Approach 1:
The inner casing is divided into two separate half-shells that can be independently mounted and dismounted. This segmentation allows the inner casing to be easily removed from the structural casing without affecting the outer casing or requiring complex disassembly procedures, thus simplifying maintenance while maintaining structural integrity through the simplified blocking system.
2Stability of the object's composition
If the inner casing is fixed to the structural casing using screws, then the assembly stability is improved, but the time required for maintenance and inspection operations increases
Solution Approach 1:
The inner casing is extracted as a separate, removable component from the structural casing. The blocking system allows the inner casing to be easily removed and reinstalled without requiring complex fastening operations, thus reducing maintenance time while maintaining assembly stability during operation through the effective blocking mechanism.
Solution Approach 2:
The blocking system is designed with pre-configured tab and chute features that enable quick and easy assembly during maintenance operations. The preliminary design of the blocking mechanism allows for rapid installation and removal of the inner casing half-shells without requiring complex procedures, thus minimizing maintenance time while ensuring stable assembly.
3Adaptability or versatility
If the turbomachine architecture includes a reduction mechanism between the low-pressure shaft and the fan, then the adaptability and performance optimization is improved, but the device complexity and difficulty of access during maintenance increase
Solution Approach 1:
The inner casing is segmented into removable half-shells that can be easily separated from the structural casing. This segmentation provides easy access to the reduction mechanism and other internal components during maintenance operations, while the blocking system ensures stable assembly during operation. The segmented design allows maintenance personnel to quickly remove the inner casing for access to complex components like the reduction mechanism.
Data Source
AI summary
The present invention relates to an assembly (12) for a turbomachine, comprising: —an outer casing (15) made of half-shells; —an inner casing (14); —a plurality of guide vanes (13) mounted between the outer casing (15) and the inner casing (14), —a structural casing comprising a flange (23) which is radially inside the inner casing (14); and—a system (24) for blocking the inner casing (14) on the structural casing, comprising a generally annular tab (25) fixed to one of the inner casing (14) and the structural casing and a complementary chute (26) fixed to the other of the inner casing (14) and the structural casing, the chute (26) being configured to receive the tab (25) and to block it along the axis (X) with respect to the structural casing.