High Pressure Piston Pump Water Lubrication PEEK
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Solution Overview
Problem
Existing high-pressure piston pumps face issues with overheating and wear due to temperature variations and dynamic forces, leading to potential component damage and environmental pollution from hydraulic oil leaks, especially when operating in natural environments.
Innovation Solution
A high-pressure piston pump design using water as the hydraulic liquid, with a cylindrical operating chamber made of polyether-ether-ketone (PEEK) and a piston of martensitic stainless steel, where the driving eccentric is offset to reduce transverse forces during compression, and optionally mixed with anti-freezing additives like ethanol or ethylene glycol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic oil is used as the hydraulic liquid, then lubrication of contacting surfaces is improved, but environmental pollution and fire risk increase
Solution Approach 1:
The patent changes the fundamental parameter of hydraulic fluid type from oil-based to water-based. This substitution eliminates environmental pollution and fire risks while maintaining hydraulic functionality through careful selection of water-soluble lubricating additives that provide necessary lubrication without the harmful effects of traditional hydraulic oil.
Solution Approach 2:
The patent employs water-soluble lubricating additives that can be easily replenished and do not require complex disposal systems. These additives are designed to be environmentally friendly and can be safely discharged, eliminating the need for expensive oil collection and disposal infrastructure while maintaining adequate lubrication throughout the system's operational life.
2Object-affected harmful factors
If water is used as the hydraulic liquid, then environmental pollution is reduced, but lubrication of contacting surfaces deteriorates
Solution Approach 1:
The patent creates a composite hydraulic fluid system by combining water with specifically selected water-soluble lubricating additives. This composite formulation provides the necessary lubrication properties for metal-to-metal contact surfaces while maintaining the environmental benefits of water-based fluid, effectively bridging the gap between eco-friendliness and mechanical protection.
Solution Approach 2:
The water-soluble lubricating additives act as intermediaries between water and the metal contact surfaces. These additives form protective films on the piston and cylinder walls, reducing direct metal-to-metal contact and wear, while the water base continues to provide cooling and hydraulic functionality without environmental harm.
3Reliability
If hydraulic oil is used, then lubrication is maintained, but overheating and heat transfer efficiency worsen
Solution Approach 1:
The patent changes the thermal parameter of the hydraulic fluid by substituting oil with water. Water's superior specific heat capacity and thermal conductivity allow for more efficient heat absorption and dissipation from the piston and surrounding components, preventing overheating while the lubricating additives maintain adequate friction protection.
4Stress or pressure
If high pressure compression is applied, then hydraulic liquid compression is improved, but transverse forces and wear increase
Solution Approach 1:
The patent uses a composite material system where the water-based hydraulic fluid combined with lubricating additives provides both the necessary incompressibility for high-pressure transmission and the lubricating properties to reduce wear from transverse forces generated during compression cycles.
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 design effectively manages temperature variations and reduces wear, enabling long-term operation without overheating and minimizing environmental pollution by using a non-toxic, less compressible hydraulic fluid with improved heat transfer and corrosion resistance.
Implementation Method 1
When the piston is moving in the opposite direction, compression occurs within the operation chamber, due which the non-return valve of the supplying conduit is closed and after that the non-return valve in the discharging conduit opens, so that compressed hydraulic liquid is discharged
Implementation Method 2
said temperature variations are not just a consequence of temperature variations in the surrounding air, but merely result from the heat which is generated during operation of the hydraulic circuit due to compression of the hydraulic media and due to resistance during circulation of the hydraulic media
Data Source
Figure 1~2
AI summary
In order to enable using water as a hydraulic liquid in a high-pressure piston pump for hydraulic circuits with nominal pressure more than 50 bar and up to at least 250 bar, on the one hand an area on the internal wall (10) of a cylindrical operating chamber (1), which cooperates with the external surface (20) of a piston (2) and is at least temporarily in contact therewith, consists of polyether-ether-ketone (PEEK), and on the other hand at least an area of the external surface (20) of said piston (20), which cooperates with said internal surface (10) of the operating chamber (1), consists of martensitic stainless steel. An eccentric (22) of a crank (21), which generates oscillating movement of the piston (2) along said cylindrical operating chamber (1), is offset relative to the longitudinal axis (100) of said operating chamber (1) at a predetermined distance (e) transversally with respect to said longitudinal axis (100), by which the crank (2) is at least during the most critical stage of the piston (2) stroke positioned at least approximately on said central axis (100) of the operating chamber (1).