Retaining Ring Piston Ring Layout for Wear-Limited Compressor Sealing
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Solution Overview
Problem
Piston rings in reciprocating compressors experience high frictional heat and wear, especially at high pressure differentials and with wear-inducing gases, leading to reduced service life and increased energy consumption due to leakage.
Innovation Solution
A piston ring arrangement featuring a retaining ring with a retaining surface directed radially inward, adjacent to the contact surface of the piston ring, which limits wear and frictional heat by maintaining the piston ring's position and allowing for radial movement, and a gap in the piston ring for initial adjustment and pretensioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If piston rings are made of low-friction materials and placed in contact with the liner, then leakage is reduced, but frictional heat generation and wear increase
Solution Approach 1:
The piston ring is divided into two distinct functional surfaces: a sealing surface that contacts the liner for sealing, and a contact surface that contacts the retaining ring for wear limitation. This segmentation allows each surface to be optimized for its specific function, reducing overall frictional heat and wear while maintaining sealing performance.
Solution Approach 2:
The retaining ring acts as an intermediary component between the piston ring and the piston groove. It provides a wear-resistant contact surface that protects the piston ring from excessive wear while allowing the piston ring to maintain its sealing function against the liner.
2Loss of energy
If piston rings are used to seal the gap between liner and piston, then leakage is limited, but service life is reduced due to wear and frictional heat
Solution Approach 1:
Different surfaces of the piston ring are given different qualities: the sealing surface is optimized for low friction and sealing contact with the liner, while the contact surface is designed for durable contact with the retaining ring. This local differentiation extends service life by protecting the sealing surface from excessive wear.
Solution Approach 2:
The retaining ring is positioned beforehand to limit the maximum wear of the piston ring. By establishing this mechanical stop in advance, the system prevents excessive wear that would otherwise occur during operation, thereby extending the service life of the piston ring.
3Power
If high pressure differentials are applied to compress process gas, then compression efficiency is improved, but wear and frictional heat of piston rings increase significantly
Solution Approach 1:
The separation of sealing and contact functions allows the sealing surface to maintain effective contact with the liner under high pressure differentials without experiencing excessive wear. The contact surface with the retaining ring handles the mechanical stress separately, protecting the sealing function.
Solution Approach 2:
The invention changes the physical parameters of the piston ring system by introducing a retaining ring with a specific retaining surface geometry. This modifies the contact conditions and pressure distribution, reducing frictional heat and wear while maintaining the high pressure differential needed for compression efficiency.
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 solution extends the service life of piston rings by limiting wear and frictional heat, reducing leakage, and maintaining a secure seal, even under high pressure and wear-inducing conditions, while allowing for efficient gas flow and stability.
Implementation Method 1
Because of the pressure increase, the process gas tends to escape along the piston from the high-pressure side to the low-pressure side
Implementation Method 2
they are usually made of materials with a low coefficient of friction, such as PEEK or PTFE compounds
Implementation Method 3
the piston ring and the retaining ring being arranged such that the retaining surface and the contact surface are adjacent in the radial direction
Data Source
AI summary
Piston ring arrangement (40) with a piston ring (50) encircling a main axis (X), the piston ring (50) having a sealing surface (58) directed radially outward and a contact surface (55) directed radially outward, the sealing surface (58) being radially outside of the contact surface (55). To improve the service life of piston rings for reciprocating compressors, the piston ring arrangement (40) has a retaining ring (70) encircling the main axis (X) with a retaining surface (72) directed radially inward, the piston ring (50) and the retaining ring (70) being situated such that the retaining surface (72) and the contact surface (55) are adjacent in the radial direction.