Turbomachine Guide Vane Interference Fit Mounting
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Solution Overview
Problem
The existing connection between guide vanes and adjusting levers in turbomachines, typically using screw connections, faces challenges such as complex geometries, narrow tolerances, and weight increase due to threaded nuts, which complicate precise adjustment and mounting/dismounting processes, especially under high loads and vibrations.
Innovation Solution
A guide vane device with a positioning segment on the shaft and a sleeve-like connecting element that forms an interference fit with the adjusting lever, eliminating the need for threads and allowing for precise, rotation-resistant mounting and easy assembly/disassembly using a heating device to expand and shrink the connecting element onto the shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a screw connection with threaded nut is used to join the adjusting lever to the guide vane, then the connection is secure under load, but the device complexity increases and the weight increases
Solution Approach 1:
The invention extracts and eliminates the threaded nut and thread structure from the connection system. Instead of using a screw connection with a separate fastening element, the guide vane shaft itself is designed with an integrated connection geometry that directly engages with the adjusting lever, removing the need for additional fastening components and simplifying the overall structure.
Solution Approach 2:
The invention merges the function of the guide vane shaft with the fastening function. The connection geometry is integrated directly into the shaft structure, combining the structural support role and the fastening role into a single unified component, thereby reducing device complexity and eliminating separate fastening elements.
2Strength
If a threaded nut is used to secure the adjusting lever, then the connection can be tightened, but the weight of the system increases
Solution Approach 1:
The threaded nut is completely removed from the assembly. The connection strength is achieved through the integrated connection geometry on the guide vane shaft that directly engages with the adjusting lever, eliminating the need for separate fastening elements and reducing overall weight.
3Reliability
If a screw connection is used for mounting the adjusting lever, then the connection can be secured, but the mounting and dismantling process becomes time-consuming
Solution Approach 1:
The connection geometry is segmented into distinct engagement features on the guide vane shaft and corresponding features on the adjusting lever. This segmentation allows for quick alignment and engagement without requiring threading operations, enabling rapid mounting and dismantling while maintaining secure connection.
4Reliability
If a threaded nut is used to prevent twisting of the adjusting lever, then rotation resistance is achieved, but additional elements and complexity are required
Solution Approach 1:
The anti-rotation function is merged with the connection structure itself. The integrated connection geometry includes features that simultaneously provide both the fastening function and the anti-rotation function, eliminating the need for separate locking elements or additional components to prevent twisting.
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
This solution provides a robust, precise, and lightweight connection that reduces material and design space requirements, simplifies the mounting and dismantling process, and prevents rotation and slipping of the adjusting lever, enhancing the power-to-weight ratio of the turbomachine.
Implementation Method 1
Heating of the connecting element by means of the heating device, so that an inner diameter of the connecting element widens
Implementation Method 2
the guide vane device forms an interference fit between the connecting element and the outer end of the shaft
Data Source
AI summary
The invention is directed to a guide vane device for a guide vane adjustment of a turbomachine, comprising a guide vane, which has a shaft extending along an adjustment axis of the guide vane, as well as an adjusting lever, which forms a connecting element for connection to an outer end of the shaft, wherein, at its outer end, the shaft has a three-dimensional front surface with at least one beveled region, the connecting element surrounds, at least in sections, the outer end of the shaft in a sleeve-like manner and is joined to the outer end in a form-fitting manner, and the guide vane device forms an interference fit between the connecting element and the outer end of the shaft.