Split Labyrinth Seal Assembly for Wear-Free Shaft Sealing
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Solution Overview
Problem
Existing rotating shaft seals experience wear due to direct contact and are difficult to replace or service without disassembling entire bearing assemblies, especially when dealing with large diameters or complex installations.
Innovation Solution
A two-piece seal assembly comprising semicircular ring-shaped subassemblies that form a labyrinth seal, allowing for non-contact rotation and easy installation without requiring removal of bearing assemblies, enabling standardized applications across various diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a contact seal is used to prevent contaminants and retain lubricant, then sealing effectiveness is improved, but friction and wear increase due to direct contact between moving parts
Solution Approach 1:
The seal is divided into two separate pieces (first seal piece and second seal piece) that can be installed independently. This segmentation allows the seal to function as a non-contact labyrinth seal, eliminating direct contact between rotating and stationary parts, thereby reducing friction and wear while maintaining sealing effectiveness through the segmented barrier structure.
Solution Approach 2:
The invention replaces the traditional mechanical contact seal system with a non-contact labyrinth seal system. Instead of relying on direct physical contact between seal lips, the system uses a series of alternating stationary and rotating labyrinth elements that create a tortuous path for contaminants and lubricant, eliminating friction and wear associated with contact seals.
2Reliability
If a single-piece seal assembly is used to ensure structural integrity, then sealing performance is improved, but ease of installation and servicing deteriorates due to difficulty in removal and replacement
Solution Approach 1:
The seal assembly is segmented into two separate pieces that can be installed and removed independently. The first seal piece is installed in a first position on the rotating shaft, and the second seal piece is installed in a second position. This segmentation enables easy installation and servicing without requiring complete disassembly of bearing assemblies, while the combined effect of both pieces maintains structural integrity and sealing performance.
3Manufacturing precision
If a standardized test rig is designed to accommodate specific bearing installation dimensions, then manufacturing precision is improved, but adaptability deteriorates when different seal diameters need to be tested
Solution Approach 1:
The two-piece seal assembly design provides universality by allowing the same test rig configuration to accommodate different seal diameters. The first and second seal pieces can be adjusted or replaced to match different diameter requirements while maintaining the same installation positions and bearing assembly configurations, thus enabling a standardized test rig to test multiple seal designs without redesign.
Data Source
AI summary
A two-piece seal assembly includes first and second seal subassemblies, each shaped as a semicircular ring. The first seal subassembly has a first stator subassembly and a first rotor subassembly that cooperate to form a first semicircular segment of a labyrinth. The second seal subassembly has a second stator subassembly and a second rotor subassembly that cooperate to form a second semicircular segment of the labyrinth. The first and second stator subassemblies, when affixed to each other, form a ring-shaped stator that encircles a rotation axis. The first and second rotor subassemblies, when affixed to each other, form a ring-shaped rotor that encircles the rotation axis and can rotate about the rotation axis relative to the stator. When the first and second seal subassemblies are affixed to each other, the first and second semicircular segments meet such that the labyrinth encircles the rotation axis.