Rotating Shaft Seal with Spring-Loaded Interlocking Sealing Units
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Solution Overview
Problem
Existing seals for rotating systems have unsatisfactory long-term sealing effects, leading to media leakage and inefficiency in preventing media escape between rotating and stationary components.
Innovation Solution
A seal comprising two interlocking sealing units with axial compression spring elements, where one unit provides a static seal and the other a dynamic seal, optimized for friction and wear resistance, with a Reuleaux triangle design for improved power transmission and assembly, and a gas supply system for enhanced sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single seal or simple seal packing is used, then the device complexity is low, but the long-term sealing effect deteriorates
Solution Approach 1:
The seal is divided into multiple sealing units (first sealing unit, second sealing unit, third sealing unit) arranged in series along the axial direction. Each sealing unit contains specific sealing rings (first sealing ring, second sealing ring, third sealing ring) that work together to provide cumulative sealing effect, thereby improving long-term sealing reliability while managing complexity through modular segmentation.
Solution Approach 2:
Compression springs are integrated into each sealing unit to provide dynamic elastic force that continuously presses the sealing rings against the shaft and sealing surfaces. This dynamic mechanism compensates for wear and radial movements over time, ensuring sustained sealing performance without requiring complex adjustment mechanisms.
2Reliability
If compression springs are added to improve sealing under radial movement, then the sealing effect improves, but the device complexity increases
Solution Approach 1:
The compression springs are merged with the sealing ring assemblies, with each sealing unit integrating both the sealing rings and compression springs as a unified component. This integration allows the elastic force to be directly applied to the sealing interface without requiring separate actuation mechanisms, improving radial movement compensation while controlling overall complexity through functional merging.
3Reliability
If multiple sealing rings are used for both static and dynamic sealing, then the sealing performance improves, but the friction and wear increase
Solution Approach 1:
Different sealing rings are assigned different material properties and functions based on their specific sealing needs. The first sealing ring uses high-friction material for static sealing, the second sealing ring uses low-friction material for dynamic sealing, and the third sealing ring provides additional sealing. This localized optimization of material properties reduces overall friction and wear while maintaining high sealing performance across all interfaces.
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 seal achieves high tightness and durability, preventing media leakage even under radial movement and wear, with a positive connection that prevents torsion and maintains sealing effectiveness over time.
Implementation Method 1
at least one axial compression spring element is arranged between the sealing units. The axial compression spring element causes the two sealing units to be pressed apart in opposite directions.
Implementation Method 2
The first sealing ring is particularly preferably made of an elastomer. As a result, the first sealing ring compensates for radial and axial displacement in the seal.
Data Source
AI summary
A seal for a rotating system with two sealing units which are arranged one behind the other along a main axis H, the sealing units each having a through-hole for a shaft and being in interlocking engagement with each other in the circumferential direction and at least one axial compression spring element being arranged between the sealing units.