Dynamic Sealing Joint Structure for Brittle High-Temperature Piping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fluid handling systems, particularly those using brittle materials like graphite, face mechanical failure due to thermal expansion and contraction, leading to pipe fracture and leakage in high-temperature and corrosive environments, such as thermal batteries.
Innovation Solution
A dynamically sealed joint structure for brittle piping systems, featuring a packing shell and deformable sealing elements, allowing for translation or rotation of pipes while maintaining a seal, using graphite or carbon-based materials with similar thermal expansion coefficients to manage thermal stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ductile materials are used for piping in thermal batteries, then the piping can absorb thermal expansion and contraction through deformation, but the piping cannot withstand high-temperature corrosive environments above 1000°C
Solution Approach 1:
The piping system is divided into multiple sections with expansion joints between them. Each section can expand and contract independently, allowing the overall system to accommodate thermal expansion while using brittle high-temperature materials like graphite that can withstand temperatures above 1000°C
Solution Approach 2:
The material selection changes from ductile metals to brittle high-temperature materials like graphite, carbon, or ceramics that can withstand temperatures above 1000°C. The design compensates for the loss of ductility by incorporating expansion joints that provide the necessary flexibility through controlled movement mechanisms
2Temperature
If brittle materials like graphite are used for high-temperature piping, then the piping can withstand temperatures above 1000°C and corrosive environments, but the piping cannot accommodate thermal expansion and contraction without fracturing
Solution Approach 1:
The piping system is segmented into multiple sections with expansion joints between them. This segmentation allows each rigid section to maintain its structural integrity at high temperatures while the expansion joints accommodate thermal expansion and contraction, preventing fracture of the brittle material
Solution Approach 2:
Expansion joints act as intermediary elements between rigid piping sections. These joints provide the necessary flexibility and movement capability, mediating between the rigid high-temperature piping sections and the thermal expansion forces, thereby preventing mechanical failure of the brittle material
3Adaptability or versatility
If expansion joints are added to allow thermal expansion, then ductile piping can accommodate growth and shrinkage, but brittle piping will still fracture or rupture at the joint locations
Solution Approach 1:
The expansion joints incorporate flexible sealing elements such as packing materials, O-rings, gaskets, or ferrules that can deform and flex to accommodate thermal expansion and contraction. These flexible elements maintain sealing integrity while allowing the rigid brittle piping sections to move relative to each other without fracturing
4Device complexity
If static sealed joints are used for brittle piping, then the joint structure is simple, but the joint cannot accommodate translation or rotation during thermal cycles
Solution Approach 1:
The joint design transitions from a static sealed joint to a dynamically sealed joint where sealing elements can flex and adapt during thermal cycles. The packing shell and sealing elements are configured to allow controlled movement and deformation, enabling the joint to accommodate translation and rotation while maintaining the seal
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
Prevents mechanical failure and leakage by accommodating thermal expansion and contraction, ensuring a tight seal in high-temperature and corrosive environments, thus enhancing the reliability and longevity of thermal batteries.
Implementation Method 1
A dynamically sealed joint structure for brittle piping systems, featuring a packing shell and deformable sealing elements, allowing for translation or rotation of pipes while maintaining a seal
Implementation Method 2
using graphite or carbon-based materials with similar thermal expansion coefficients to manage thermal stresses
Data Source
AI summary
A joint structure may include a first component and a second component aligned in a first direction, where a first end of the first component is opposed to a first end of the second component. The joint structure may include a packing shell positioned around the first end of the first component and the first end of the second component such that the first component is inserted into the packing shell from the first end and the second component is inserted into the packing shell from the first end. The joint structure may include a first sealing element positioned between the packing shell and the first end of the first component and further extending into the packing shell. The joint structure may include a second sealing element positioned between the packing shell and the first end of the second component and further extending into the packing shell.