Graphite Manifold Interface Seal for Vibration and Thermal Strain
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Solution Overview
Problem
Conventional metal seals lack flexibility, causing them to transmit structural forces between a manifold and a power cylinder due to vibration and thermal strain, which can lead to misalignment and gas leakage in linear generators.
Innovation Solution
A sealing assembly with a graphite seal and spring elements is used, featuring a circumferential recess and radially outward spring force to maintain contact with the cylinder, allowing for relative motion and minimizing structural force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional metal seals are used, then sealing capability is provided, but structural forces are transmitted between manifold and power cylinder due to vibration and thermal strain
Solution Approach 1:
The patent employs a flexible graphite seal instead of a rigid metal seal. The graphite material can deform elastically to accommodate vibration and thermal expansion, preventing the transmission of structural forces between the manifold and power cylinder while maintaining the sealing function.
Solution Approach 2:
The patent changes the material parameter from rigid metal to flexible graphite, which has different mechanical properties including lower modulus of elasticity and higher compliance. This parameter change allows the seal to absorb dimensional changes due to thermal strain and vibration without transmitting forces.
2Manufacturing precision
If rigid metal seals are used, then manufacturing precision can be maintained, but misalignment occurs due to vibration and thermal expansion
Solution Approach 1:
The patent transitions from a static rigid metal seal to a dynamic flexible graphite seal that can adapt its shape in response to changing conditions. The graphite seal deforms dynamically to accommodate vibration and thermal expansion, maintaining alignment stability despite external disturbances.
Solution Approach 2:
The flexible graphite seal acts as a compliant element that can deform to accommodate misalignment caused by vibration and thermal expansion, thereby maintaining the sealing function without requiring high manufacturing precision for perfect alignment.
3Strength
If metal seals are used, then structural support is provided, but gas leakage occurs due to misalignment from vibration and thermal strain
Solution Approach 1:
The flexible graphite seal provides both structural support and compliance. It can deform to maintain contact with the sealing surfaces under varying conditions, preventing gas leakage paths that would occur with rigid seals experiencing misalignment from vibration and thermal strain.
Solution Approach 2:
The use of graphite material provides a composite solution combining structural integrity with flexibility. Graphite has sufficient strength to provide structural support while simultaneously offering the compliance needed to prevent gas leakage under dynamic operating conditions.
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 effectively isolates the manifold from the power cylinder, maintaining alignment and reducing gas leakage by accommodating thermal expansion and vibration, while maintaining tight tolerances and efficient operation.
Implementation Method 1
a spring element arranged within the circumferential recess, radially outward of the seal providing a radially inward force on the seal
Implementation Method 2
The solution effectively isolates the manifold from the power cylinder, maintaining alignment and reducing gas leakage by accommodating thermal expansion and vibration
Data Source
AI summary
Systems and assemblies are provided for sealing an interface between a cylinder and a manifold corresponding to the cylinder. The cylinder comprises at least one port. A manifold interface is arranged adjacent to the at least one port. A seal is located inside of a circumferential pocket, wherein the circumferential pocket comprises at least a portion of the manifold interface. A spring is configured to preload the seal radially inward so that the seal stays in contact with the outer surface of the cylinder.