Segmented Shaft Seal for Turbomachine Gap Corrosion
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Solution Overview
Problem
Corrosion of shaft gearing in turbomachines due to exposure to process gases leads to unreliable connections and high maintenance costs, with existing corrosion-resistant coatings like chrome plating being costly and prone to mechanical stress-induced failures.
Innovation Solution
A shaft seal comprising a sealing bush and ring is used to cover the gap between the shaft ends, providing a corrosion-resistant, fluid-tight connection that can be easily replaced, eliminating the need for complex coatings and reducing downtime and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If chrome plating is applied to protect shaft ends from corrosion, then corrosion resistance is improved, but mechanical stress causes cracks and flaking leading to reduced reliability
Solution Approach 1:
The shaft protection system is segmented into two parts: the shaft core and the removable shaft seal with sealing bush and sealing ring. This allows the sealing function to be separated from the shaft structure, enabling independent replacement of the sealing component without affecting the shaft itself.
Solution Approach 2:
The shaft seal with sealing bush and sealing ring acts as a disposable protective component that can be easily replaced when worn or damaged. This eliminates the need for expensive and time-consuming shaft rework or replacement, providing an economical solution for maintaining corrosion protection.
2Object-affected harmful factors
If chrome plating is applied to ensure corrosion resistance, then protection against process gases is improved, but the complex plating process increases manufacturing cost and time
Solution Approach 1:
The shaft protection system is segmented into two parts: the shaft core and the removable shaft seal with sealing bush and sealing ring. This allows the sealing function to be separated from the shaft structure, enabling independent replacement of the sealing component without affecting the shaft itself.
Solution Approach 2:
The shaft seal with sealing bush and sealing ring acts as a disposable protective component that can be easily replaced when worn or damaged. This eliminates the need for expensive and time-consuming shaft rework or replacement, providing an economical solution for maintaining corrosion protection.
3Ease of repair
If shafts are removed or readjusted for repair, then damaged components can be replaced, but severe mechanical stress causes chrome layer flaking and requires lengthy downtime
Solution Approach 1:
The shaft protection system is segmented into two parts: the shaft core and the removable shaft seal with sealing bush and sealing ring. This allows the sealing function to be separated from the shaft structure, enabling independent replacement of the sealing component without affecting the shaft itself.
Solution Approach 2:
The shaft seal with sealing bush and sealing ring acts as a disposable protective component that can be easily replaced when worn or damaged. This eliminates the need for expensive and time-consuming shaft rework or replacement, providing an economical solution for maintaining corrosion protection.
4Object-affected harmful factors
If chrome plating is applied to protect shaft gearing, then corrosion resistance is improved, but the cost of plating and subsequent repairs increases maintenance cost
Solution Approach 1:
The shaft protection system is segmented into two parts: the shaft core and the removable shaft seal with sealing bush and sealing ring. This allows the sealing function to be separated from the shaft structure, enabling independent replacement of the sealing component without affecting the shaft itself.
Solution Approach 2:
The shaft seal with sealing bush and sealing ring acts as a disposable protective component that can be easily replaced when worn or damaged. This eliminates the need for expensive and time-consuming shaft rework or replacement, providing an economical solution for maintaining corrosion protection.
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 shaft seal effectively prevents corrosion and ensures a reliable, gas-tight connection, reducing maintenance costs and downtime by simplifying replacement and eliminating the need for expensive chrome plating.
Implementation Method 1
it is provided that it be slipped onto the respective shaft ends with a clearance fit and, for example, be shrunk by thermal effects, so that a press fit is then provided when in use
Data Source
Figure 1
AI summary
The invention relates to a shaft seal for sealing off a gap formed by a shaft toothing between one end of a drive shaft introduced into a housing and a further shaft in the housing, characterized in that the shaft seal (1) is formed in a bushing-like manner and extends over regions of the drive shaft (2) and of the further shaft (5) and covers the gap, and in that a sealing ring (8) is arranged, at at least one free end of the shaft seal (1), on the particular shaft (2, 5), said sealing ring (8) interacting with the shaft (2, 5) and the shaft seal (1) and providing a fluid-tight connection.