Cryogenic Piston Compression Seal Leak Detection
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Solution Overview
Problem
The existing piston compression devices used in high-pressure cryogenic fluid installations suffer from seal wear and leakage issues due to thermal and mechanical stresses, leading to reduced efficiency and increased risk of piston breakage, which is difficult to detect and address in real-time.
Innovation Solution
A compression device with a micro-switch-based fluid detection system that uses a tab operable under fluid pressure to interrupt or establish electrical contact, allowing for immediate detection and automatic stopping of the piston movement when fluid leaks occur, thereby preventing further damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the piston continues to operate at high frequency after seal wear occurs, then the compression function is maintained temporarily, but the piston may breakage due to detached seal fragments
Solution Approach 1:
The exhaust orifice and detection means are prepared in advance to detect seal leaks before they cause piston breakage. The system proactively monitors for fluid leakage through the worn seal and triggers automatic shutdown before catastrophic failure occurs.
Solution Approach 2:
The detection means provides real-time feedback about seal condition by monitoring for fluid leakage through the exhaust orifice. This feedback loop enables the control system to automatically stop piston movement when seal wear is detected, preventing further damage.
2Reliability
If a complex detection system is installed to detect seal wear in real-time, then piston safety is improved, but device complexity increases
Solution Approach 1:
The detection function is extracted as a separate, simple module with the exhaust orifice and detection means positioned independently from the main compression mechanism. This modular approach simplifies the overall system while maintaining effective monitoring capability.
Solution Approach 2:
The exhaust orifice acts as an intermediary element that translates seal condition into detectable fluid flow. Rather than directly monitoring the seal, the system uses the orifice to convert seal leakage into a measurable signal that triggers the shutdown mechanism.
3Reliability
If the piston movement is stopped immediately upon detecting fluid leak, then piston breakage risk is reduced, but operational downtime increases
Solution Approach 1:
The sealing gasket is designed as a consumable component that is replaced periodically before it can cause piston breakage. This preventive replacement strategy is more cost-effective than repairing piston damage, accepting planned downtime for seal maintenance.
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
This solution significantly reduces the risk of piston breakage and seal detachment, improving operational safety and efficiency by enabling quick detection and response to seal leaks, minimizing downtime and maintenance costs.
Implementation Method 1
a tab (12) operable under the effect of pressure exerted by a fluid flow (20) on said tab (12)
Data Source
Figure 1~2
Figure 3a~3b
Figure 4
AI summary
The device has a set of compartments (8) including a peripheral wall that is attached to one of the set of compartments. A passage is arranged between the set of compartments. A compression piston (5) is arranged in the passage. A detection unit (11) detects a flow of fluid i.e. liquid nitrogen. A micro switch includes two electric poles. A strip (12) is actionable under the effect of pressure by the flow of fluid on the strip so that the strip ensures or interrupts an electrical contact between the poles when the flow of fluid escapes by an exhaust opening (9). An independent claim is also included for a work installation.