Stuffing Box Seal Ring Assembly for Low-Friction Compressor Sealing
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Solution Overview
Problem
Reciprocating gas compressors experience frequent maintenance due to high friction wear of sealing elements in stuffing boxes, leading to short maintenance intervals and inefficiencies, despite previous attempts to address wear through material adjustments and pressure compensation techniques.
Innovation Solution
A stuffing box sealing arrangement with pressure compensation and novel wear-resistant seal ring linings made from PEEK with nano-material additives, reducing friction and heat generation, and capable of withstanding high pressures and contamination, allowing for a compact design and extended maintenance intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing elements are used in stuffing boxes, then the compressor can operate continuously, but the sealing elements suffer from high friction wear and short working life
Solution Approach 1:
The patent changes the material parameters of the sealing elements by incorporating solid lubricant particles (graphite, PTFE, MoS2) into the polymer matrix. This compositional parameter change reduces the friction coefficient and wear rate, directly addressing the friction wear problem while maintaining sealing reliability
Solution Approach 2:
The patent uses composite materials consisting of polymer matrices (polyurethane, polyacetal, PEEK) reinforced with solid lubricant particles (graphite, PTFE, MoS2). This composite structure combines the mechanical strength of the polymer with the low-friction properties of the lubricant particles, resolving the contradiction between durability and friction wear
2Reliability
If multiple sealing rings and pressure breaker rings are used to reduce wear, then sealing performance improves, but the device complexity increases
Solution Approach 1:
The patent merges multiple sealing functions into a single sealing element by incorporating solid lubricant particles directly into the polymer matrix. This eliminates the need for separate pressure breaker rings and multiple sealing rings, reducing component count while maintaining sealing performance through the inherent low-friction properties of the composite material
3Reliability
If frequent maintenance is performed to replace worn sealing elements, then reliability is maintained, but system efficiency decreases
Solution Approach 1:
The patent changes the material parameters by incorporating solid lubricant particles into the polymer matrix, which fundamentally reduces friction wear rates. This parameter change extends the working life of sealing elements from months to years, reducing maintenance frequency and improving overall compressor operational efficiency while maintaining sealing reliability
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 results in a sealing assembly with reduced frictional power, lower wear, and decreased gas leakage, enabling longer operation between maintenance and improved performance under high pressure and non-lubricated conditions, with a single ring configuration and reduced total seal material required.
Implementation Method 1
the material used for the seal linings has a reduced friction coefficient which reduces friction wear even further
Implementation Method 2
PEEK with nano-material additives for reduced friction and increased thermal conductivity
Implementation Method 3
pressure compensation is employed to reduce the radial force on the seal rings
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A sealing ring is provided for use in a chamber of a stuffing box of a reciprocating compressor. The sealing ring comprises first and second seal rings (144,146) engaged along respective side surfaces. A cover ring (140) is disposed around the first and second seal rings (144,146) such that outside diameters of the first and second seal rings engage an inside diameter of the cover ring. The sealing ring further comprises a support ring (136) engaged with the first seal ring (144) and the cover ring (140), and a backup ring (138) engaged with the second seal ring (146) and the cover ring (140).