Hollow Engine Shaft Internal Coating for Uniform Corrosion Protection
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Solution Overview
Problem
Hollow shafts in aircraft engines are difficult to coat due to limited access to their inner surfaces, making existing techniques unsuitable for effective protection against corrosion.
Innovation Solution
A surface treatment device with an elongated rod and applicator system is used to apply a surface treatment agent to the inner surface of hollow engine shafts, ensuring uniform and repeatable application of coatings like paint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If paint guns are used to coat the outer shaft surfaces, then the outer surface protection is achieved, but the inner surface cannot be effectively coated due to limited access
Solution Approach 1:
The applicator device is inserted inside the hollow shaft, with the elongated rod passing through the inner passage to deliver coating material directly to the inner surface. This nested configuration allows the coating apparatus to access the previously unreachable inner surface while maintaining structural integrity
Solution Approach 2:
The elongated rod with inner passage serves as an intermediary conduit, transporting the surface treatment agent from the external supply to the applicator at the distal end, enabling coating material delivery to the confined inner surface area
2Object-affected harmful factors
If the inner surface is coated, then corrosion protection is improved, but the coating application consistency and uniformity become difficult to control
Solution Approach 1:
The applicator is designed with specific geometric features and material properties tailored for the inner surface coating application, allowing controlled delivery of coating material with consistent thickness despite the confined access conditions
Solution Approach 2:
The device enables controlled application where the coating process can be monitored and adjusted to maintain consistent thickness, ensuring uniform protection across the inner surface through precise material delivery
3Ease of operation
If a specialized applicator device is inserted inside the hollow shaft, then inner surface coating becomes possible, but the device complexity increases
Solution Approach 1:
The elongated rod with inner passage serves multiple functions: it acts as a structural support, a material delivery conduit, and a positioning mechanism for the applicator, reducing the need for separate components and simplifying the overall device architecture
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 device enables consistent and efficient coating of the inner surfaces of hollow engine shafts, improving protection against corrosion and ensuring minimal thickness variation along the axial length.
Implementation Method 1
directing a surface treatment agent through an inner passage of the elongated rod towards the distal end
Implementation Method 2
applying the surface treatment agent from the supply of the surface treatment agent to the inner surface of the hollow engine shaft
Data Source
AI summary
A surface treatment device for applying a surface treatment to an inner surface of a hollow engine shaft includes a supply of a surface treatment agent and an elongated rod extending from a proximal end to a distal end. The elongated rod has an inner passage extending from the proximal end to the distal end. The proximal end has an inlet fluidly coupled to the supply of the surface treatment agent. The inner passage terminates at an outlet at the distal end. The elongated rod is insertable inside the hollow engine shaft. An applicator is disposed at the distal end of the elongated rod adjacent the outlet. The applicator is engageable with the inner surface of the hollow engine shaft for applying the surface treatment agent from the supply of the surface treatment agent to the inner surface of the hollow engine shaft.