Segmented Turbine Drawer with Dovetail Joint
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Solution Overview
Problem
Existing gas turbine designs face challenges with mechanical decoupling, high machining precision requirements, unwanted force impacts on sensitive components, and difficulties in easy assembly and disassembly due to lack of mechanical decoupling in pullable drawers.
Innovation Solution
A pullable drawer design with a cylindrical body divided into separate parts coupled by a releasable dovetail joint allowing movement along a perpendicular axis, incorporating a leave spring for axial separation and vibration suppression, and retention within a flanged connection with external covers for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid pullable drawer design is used to ensure mechanical stability, then the structural strength is improved, but the machining precision requirements increase and unwanted force impacts occur on sensitive components
Solution Approach 1:
The pullable drawer is divided into two separate parts: a first part that is rigidly connected to the outer housing, and a second part that contacts the inner carrier. These parts are coupled by a releasable mechanical joint with degrees of freedom, allowing the rigid structure to be segmented into flexible, adjustable components that reduce machining precision requirements while maintaining overall strength.
Solution Approach 2:
The mechanical joint between the first and second parts is designed to be releasable and possess degrees of freedom for relative movement. This dynamic capability allows the joint to adapt to manufacturing tolerances and absorb unwanted force impacts, maintaining structural strength without requiring extremely high machining precision.
2Reliability
If a mechanically coupled drawer design is used to ensure stability, then the reliability is improved, but the ease of assembly and disassembly deteriorates
Solution Approach 1:
By segmenting the drawer into a first part rigidly connected to the outer housing and a second part contacting the inner carrier, coupled by a releasable mechanical joint, the design maintains reliability through stable mechanical connections while enabling easy assembly and disassembly by simply releasing the mechanical joint without complex removal procedures.
Solution Approach 2:
The releasable mechanical joint with degrees of freedom provides both stability during operation and ease of assembly/disassembly. The joint can be locked for reliable operation but released when maintenance or replacement is needed, eliminating the need for complex removal procedures while maintaining mechanical stability.
3Stability of the object's composition
If a fixed drawer design is used to prevent vibrations, then the stability is improved, but the adaptability to thermal expansion and contraction deteriorates
Solution Approach 1:
The mechanical joint between the first and second parts is designed with degrees of freedom that allow dynamic adjustment. This enables the drawer to adapt to thermal expansion and contraction of the turbine components while the joint itself suppresses harmful vibrations through its controlled movement capabilities, achieving both vibration suppression and thermal adaptability.
Solution Approach 2:
The mechanical joint allows changes in relative position and orientation parameters between the first and second parts in response to thermal conditions. This parameter adaptability enables the drawer to accommodate thermal expansion and contraction while maintaining vibration suppression through the joint's damping characteristics.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides mechanical decoupling, easy and fast assembly/disassembly, and effective vibration suppression, addressing issues of unwanted force impacts and maintaining robustness and accessibility without complex removal procedures.
Implementation Method 1
a spring is arranged within said dovetail joint between said pin and said dovetail in order to exert a separating force in axial direction between said first and second parts of said pullable drawer
Implementation Method 2
effective vibration suppression, addressing issues of unwanted force impacts
Data Source
AI summary
The invention is related to a pullable drawer (18) for removably protruding in a radial direction into an outer housing of a turbine, especially gas turbine, in order to make mechanical contact with an inner carrier being concentrically arranged within said outer housing, whereby said pullable drawer (18) has an essentially cylindrical body (32, 33), which extends along a longitudinal drawer axis (A1). A mechanical decoupling is provided, as said pullable drawer (18) is divided along said longitudinal drawer axis (A1) into at least separate first and second parts (32, 33), which first and second parts (32, 33) are coupled with each other by means of a releasable mechanical joint (24).