Oil-Slinger Face Seal Assembly for Lubricant Leakage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional face seals in rotating machines are prone to leakage due to geometric imperfections, misalignment, and wear, especially when subjected to higher internal pressures and air/oil mist environments.
Innovation Solution
A face seal assembly featuring a rotationally fixed seal element with radially extending fins that create centrifugal force to keep lubricant away from the seal interface, combined with a biasing element to ensure contact between the seal element and the rotating component, effectively preventing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional face seal is used, then the seal structure is simple, but leakage occurs due to geometric imperfections, misalignment or wear after extended usage
Solution Approach 1:
The seal assembly is divided into multiple functional components: a stationary seal element, a rotating component with seal surface, and centrifugal force-generating elements (fins or vanes). This segmentation allows each component to perform its specific function independently, improving overall seal reliability while managing complexity through modular design
Solution Approach 2:
A lubricant barrier is introduced as an intermediary substance between the seal surfaces. The lubricant creates a protective film that prevents direct contact and wear, while the centrifugal force elements manage lubricant distribution. This intermediary layer significantly reduces leakage and extends seal life
2Stress or pressure
If the seal operates in higher internal pressure environments, then the sealing capability is challenged, but the typical face seal is subject to leakage
Solution Approach 1:
The centrifugal force elements (fins or vanes) are positioned to actively manage lubricant distribution before the lubricant can reach the seal interface under pressure. This preliminary action of directing lubricant flow away from the seal area prevents pressure-induced leakage by maintaining a controlled barrier at the seal interface
Solution Approach 2:
The design changes the physical parameters of the seal environment by introducing centrifugal force fields through rotating fins or vanes. This creates a dynamic lubricant management system that adapts to varying pressure conditions, maintaining effective sealing even under higher internal pressures
3Object-affected harmful factors
If the seal operates in air/oil mist environments, then the sealing challenge increases, but the typical face seal experiences wear after extended usage
Solution Approach 1:
The lubricant acts as an intermediary protective layer between the seal surfaces, shielding them from direct exposure to the harmful air/oil mist environment. This lubricant barrier reduces friction and wear, significantly extending seal service life in challenging environments
Solution Approach 2:
The rotating centrifugal force elements continuously manage lubricant distribution at the seal interface, ensuring the lubricant barrier is maintained automatically during operation. This self-service mechanism ensures consistent protection against wear without external intervention, extending seal durability
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 significantly reduces lubricant leakage by utilizing centrifugal force to maintain the seal interface dry, enhancing the seal's durability and performance over extended usage.
Implementation Method 1
A plurality of fins extend radially outwardly from the second component body in the chamber interior, such that the plurality of fins create a centrifugal force on the volume of lubricant to urge the volume of lubricant away from the seal interface
Data Source
AI summary
A face seal assembly includes a rotationally fixed first component at least partially defining an interior chamber containing a volume of lubricant. The first component includes a rotationally fixed seal element. A rotatable second component is rotatable about an axis of rotation relative to the first component. The second component includes a second component body extending along the axis of rotation from the interior chamber to outside of the interior chamber. An axially facing component surface is located in the interior chamber and is configured to engage with an axially-facing element surface of the seal element to define a seal interface of the face seal. A plurality of fins extend radially outwardly from the second component body in the chamber interior, such that the plurality of fins create a centrifugal force on the volume of lubricant to urge the volume of lubricant away from the seal interface.