Inverted Conical Sealing for High-Pressure Sensor Leakage
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Solution Overview
Problem
High-pressure sensors face issues with leakage due to high wear and plastic deformation at conical sealing interfaces, where relative movement between components occurs, and existing solutions fail to provide a self-amplifying sealing effect and are not feasible for large diameters or compatible with certain pressure media.
Innovation Solution
A conical sealing system with an inwardly facing acute-angled arrangement between a housing projection and an inner part shaft, where the clamping force ensures the outer rim of the shaft rests on the housing, increasing the sealing effect with pressure and preventing relative movement, utilizing a uniformly distributed rigidity and specific angle orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conical sealing is formed between housing and inner part shaft, then sealing effect is achieved, but high wear and plastic deformation occur at the sealing interface
Solution Approach 1:
The sealing cone is inverted so that the acute angle faces inward toward the pressure medium rather than outward. This reversal changes the stress distribution at the sealing interface, preventing plastic deformation and wear while maintaining effective sealing under high pressure
Solution Approach 2:
The sealing interface uses a conical geometry with specific angle orientation to concentrate sealing forces at the critical interface region while distributing stresses away from the shaft and housing bulk materials, preventing localized wear and deformation
2Reliability
If clamping force is applied between housing and inner part, then sealing pressure is maintained, but relative movement between components occurs causing wear
Solution Approach 1:
Inverting the conical sealing geometry reverses the direction of force components at the interface, allowing the clamping force to generate sealing pressure without creating relative movement between the shaft and housing, thereby eliminating wear while maintaining sealing effectiveness
3Reliability
If intermediate part is clamped between housing and inner part, then sealing is achieved, but solution is not feasible for large diameters and lacks self-amplifying effect
Solution Approach 1:
The inverted conical sealing eliminates the need for intermediate parts by directly engaging the shaft with the housing in a geometry that provides both sealing and structural support, making the solution scalable to large diameters while incorporating a self-amplifying pressure effect
Solution Approach 2:
The sealing system is self-amplifying, where the internal pressure itself enhances the sealing effect by increasing the contact force between the inverted cone surfaces, eliminating the need for additional intermediate components or external preloading mechanisms
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 enhances sealing efficacy with increasing pressure, prevents relative movement, and extends service life by maintaining uniform rigidity and reducing wear, making it suitable for large diameters and various pressure media, including hydraulic oils and corrosive gases.
Implementation Method 1
a conical sealing arranged in an inwardly facing, i.e. engaging in an acute-angled manner between a projection within the housing and a shaft of an inner part
Implementation Method 2
Due to the clamping force applied between the housing and the inner part the outer rim portion of the shaft is forced to and rests on the housing
Data Source
AI summary
A high-pressure sensor comprises an inner part, a housing and a sealing system located between the inner part and the housing for sealing the high-pressure sensor. The inner part has a shaft having an end face resting, by means of a clamping force, at least along a sealing line on a support surface at a projection on the housing. Each of the projection and the shaft has an inner surface and an outer surface. The support surface is arranged in an acute angle with respect to the inner surface of the projection. The shaft by means of the clamping force is supported on the housing along a support line whereby the sealing effect can be increased with increasing pressure.