Piston Ring Dual O-Ring Seal Pressure Amplification
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Solution Overview
Problem
Existing piston actuators face challenges in achieving a reliable fluid seal across the cylinder wall, particularly in maintaining a pressure differential to ensure effective operation and minimize wear on the piston ring.
Innovation Solution
The design incorporates a piston ring with a first o-ring and a second o-ring, where the first o-ring is in contact with the second o-ring, and the second o-ring is disposed in a circumferential groove, allowing a first pressure in a fluid chamber to be applied to the first o-ring, which then transfers force to the second o-ring to create a second pressure against the cylinder wall, greater than the initial pressure, thereby forming a robust fluid seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single seal is used in existing piston actuators, then the device complexity is reduced, but the reliability of the fluid seal across the cylinder wall deteriorates
Solution Approach 1:
The piston ring is segmented into two distinct seals: a first seal (O-ring) disposed in a first groove and a second seal (O-ring) disposed in a second groove. This segmentation allows each seal to perform a specific function - the first seal seals against the piston and the second seal seals against the cylinder wall, thereby improving fluid seal reliability while maintaining manageable device complexity through functional specialization.
Solution Approach 2:
The first seal acts as an intermediary element that receives fluid pressure from the fluid chamber and transfers this pressure to the second seal. This intermediary mechanism enables the pressure transfer necessary for the second seal to maintain effective contact with the cylinder wall, ensuring reliable sealing without requiring direct pressure application to the second seal.
2Force
If fluid pressure is directly applied to the second seal, then the sealing force is sufficient, but the pressure differential required for effective operation is compromised
Solution Approach 1:
The first seal serves as a pressure intermediary that receives the full fluid pressure from the fluid chamber and transmits a portion of this pressure to the second seal. This arrangement allows the second seal to receive sufficient sealing force while the first seal maintains the necessary pressure differential across the piston, as it is positioned to experience the full pressure difference between the fluid chamber and the external environment.
Solution Approach 2:
By segmenting the sealing function into two separate seals positioned at different locations, the system can optimize each seal's role - the first seal handles the pressure differential requirement while the second seal provides the sealing force against the cylinder wall, thereby resolving the contradiction between sufficient sealing force and maintaining pressure differential.
3Reliability
If a robust fluid seal is implemented, then the reliability improves, but wear on the piston ring increases
Solution Approach 1:
The segmentation of sealing functions between two seals allows the second seal to provide robust sealing against the cylinder wall while the first seal absorbs some of the mechanical stress and wear from pressure fluctuations. This functional division protects the second seal from excessive wear, extending the overall service life of the piston ring assembly while maintaining reliable sealing.
Solution Approach 2:
The first seal acts as a protective intermediary that absorbs some of the mechanical and pressure-related stresses, thereby reducing the wear burden on the second seal. This intermediary arrangement allows the second seal to maintain reliable sealing contact with the cylinder wall without being subjected to the full extent of operational stresses, thus extending its service life.
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 configuration ensures a reliable fluid seal across the cylinder wall, maintaining the desired pressure differential and minimizing wear on the piston ring, thus enhancing the operational efficiency and longevity of the piston actuator.
Implementation Method 1
the first seal is to provide a fluid seal against the piston
Implementation Method 2
the second seal is to provide a fluid seal against a cylinder wall
Implementation Method 3
The fluid is to apply a first pressure to the piston ring to enable the piston ring to apply a second pressure to a cylinder wall. The second pressure is to be greater than the first pressure.
Data Source
AI summary
Pistons are disclosed herein. An apparatus includes an actuator defining a first chamber; and a piston disposed in the first chamber, the piston including a second chamber and a seal groove in which a seal is disposed, the second chamber to receive fluid from the first chamber to enable a force imparted by the fluid within the second chamber to urge the seal into sealing engagement with a surface defining the first chamber.