Hydrogen Engine Piston Water Lubrication for Clean Sealing
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Solution Overview
Problem
Existing combustion engines, particularly hydrogen engines, face challenges with lubrication oil slipping into the combustion chamber, leading to particulate formation and inefficiencies, as conventional lubrication systems are not adequately adapted for hydrogen fuel.
Innovation Solution
A piston arrangement with a water channel and a pumping element that uses pressurized gas from the combustion chamber to lubricate a sealing ring, eliminating the need for external lubrication and pressurization, and utilizing by-product water from hydrogen combustion for self-contained lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lubrication oil is used in hydrogen combustion engines, then the piston can be lubricated, but lubrication oil slips into the combustion chamber causing particulate formation and emissions
Solution Approach 1:
The system uses water produced during hydrogen combustion as the lubricant, eliminating the need for external lubrication systems. The combustion by-product (water) serves the dual purpose of exhaust product and lubricant, preventing oil contamination while maintaining reliable sealing
Solution Approach 2:
The invention introduces a water injection system that delivers water to the sealing ring through hydraulic channels in the piston. This hydraulic approach replaces conventional oil-based lubrication, providing effective sealing without particulate contamination from oil slip
2Reliability
If external pressurization system is added for water lubrication, then water can be delivered to sealing ring, but device complexity increases
Solution Approach 1:
The system exploits the existing high-pressure environment within the combustion chamber to pressurize and deliver water to the sealing ring. The combustion process itself provides the necessary pressure, eliminating the need for separate external pressurization equipment and reducing overall system complexity
Solution Approach 2:
The combustion chamber serves multiple functions: it generates power, produces water as a by-product, and provides the pressurization mechanism for water delivery to the sealing ring. This multi-functionality eliminates the need for dedicated external pressurization systems
3Device complexity
If water is used as lubricant without pressurization, then system is simpler, but water cannot reach sealing ring effectively under combustion pressure
Solution Approach 1:
The invention utilizes hydraulic channels integrated into the piston structure to deliver water under pressure to the sealing ring. The combustion chamber pressure directly pressurizes the water, ensuring effective delivery to the sealing interface without requiring additional mechanical pressurization components
Solution Approach 2:
The piston acts as an intermediary that receives high-pressure water from the combustion chamber and directs it through internal channels to the sealing ring. This intermediary structure enables effective water delivery by leveraging the existing combustion pressure while maintaining a simple overall system design
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 provides effective sealing and lubrication without external lubricants, reducing particulate formation and improving engine efficiency by balancing pressure over the sealing ring and utilizing waste water for lubrication, thus enhancing engine performance and reducing costs.
Implementation Method 1
a pumping element configured to be arranged to pressurize the water in the water channel by pressurised gas in the first compartment
Implementation Method 2
a water channel extending from an interior of the piston to the sealing ring to provide water for lubricating the sealing ring
Data Source
AI summary
A piston arrangement for a clean combustion engine, such as a hydrogen engine. The piston arrangement comprises a piston configured for reciprocal movement inside a cylinder having a cylinder wall, the piston having a piston head configured to face a first compartment with pressurized gas, a sealing arrangement comprising at least one sealing ring configured to be arranged to seal the piston to the cylinder wall and separating the first compartment from a second compartment, and a water channel extending from an interior of the piston to the sealing ring to provide water for lubricating the sealing ring. The piston head comprises a pumping element configured to be arranged to pressurize the water in the water channel by pressurised gas in the first compartment.