Inflatable Piston Seals for Hydraulic Cylinder Leakage Control
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Solution Overview
Problem
Hydraulic systems face issues with hydraulic fluid seepage and inefficiency due to inadequate sealing in hydraulic cylinders, leading to uncontrolled steam turbine speeds and increased wear and damage from debris and contamination.
Innovation Solution
Incorporation of dynamic, inflatable seals with chambers and interior cavities in hydraulic pistons, filled with hydraulic fluid under pressure to enhance sealing performance and include nano particles for reduced friction and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional static seals are used in hydraulic cylinders, then the device complexity is low, but hydraulic fluid seepage occurs and sealing performance is inadequate
Solution Approach 1:
The patent applies the dynamics principle by transforming static seals into dynamic inflatable seals that can change their sealing characteristics in response to operating conditions. The seals are inflated with hydraulic fluid under pressure, allowing them to expand and conform to the cylinder wall, thereby improving sealing performance while maintaining system reliability.
Solution Approach 2:
The patent utilizes hydraulics by using hydraulic fluid under pressure to inflate the seals. The pressurized hydraulic fluid is directed into the seal chambers, causing the seals to expand and improve their sealing effectiveness against the cylinder wall, thus preventing fluid seepage.
2Reliability
If seal pressure is increased to prevent seepage, then sealing performance improves, but friction and wear between seal and cylinder wall increase
Solution Approach 1:
The patent applies parameter changes by modifying the physical state and pressure characteristics of the seal material. By controlling the inflation pressure of the seals, the system optimizes the balance between sealing force and frictional resistance, allowing effective sealing while minimizing wear on the cylinder wall and seal surfaces.
Solution Approach 2:
The patent utilizes composite materials by incorporating PTFE (polytetrafluoroethylene) into the seal material composition. PTFE is known for its low friction and high wear resistance properties, which reduce the harmful friction and wear effects while maintaining effective sealing performance under pressure.
3Productivity
If hydraulic fluid seepage is prevented with better seals, then system efficiency improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies segmentation by dividing the seal into multiple chambers that can be independently inflated. This segmentation allows for more controlled deployment and sealing action, improving system efficiency by preventing seepage at multiple locations along the piston rod while managing the complexity through modular chamber 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
Enhances sealing performance, reduces hydraulic fluid seepage, improves system efficiency, and increases the mean time between failures while preventing uncontrolled steam turbine speeds.
Implementation Method 1
The inflatable seals include chambers that can be filled with hydraulic fluid when hydraulic fluid in contact with the piston is pressurized. Pressurization of the hydraulic cylinder provides hydraulic fluid to the chambers which in turn provide hydraulic fluid to the interior cavity. The hydraulic fluid inflates the seal.
Implementation Method 2
Inflation of the inflatable seals increases the force exerted by the seal on the cylinder wall and the piston improving the sealing performance
Implementation Method 3
Inclusion of nano particles in the seals can decrease the coefficient friction between the seals and the cylinder wall or piston rod
Data Source
AI summary
Systems and devices include a hydraulic cylinder piston including a piston rod having a first end and a second end opposite the first end; a piston head coupled to the first end of the piston rod; and two inflatable seals disposed around an outer circumference of the piston head, each inflatable seal including one or more chambers configured to receive hydraulic fluid to inflate the seal.