Sealing Element with Lipophilic Absorber for Shaft Leakage
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Solution Overview
Problem
Existing sealing elements for shaft seals often require additional sensors and mechanisms to address leaks, which can be costly and inefficient, and may not effectively prevent lubricant escape into the environment.
Innovation Solution
A sealing element with a lipophilic, hydrophobic absorber activation element that passively applies a further sealant to the shaft sealing surface upon leakage, using a swelling or chemical reaction to reseal the shaft without external sensors or additional parts, and can visibly indicate seal failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional sensors and mechanisms are used to address leaks in sealing elements, then the reliability of leak detection and response is improved, but the device complexity and cost increase
Solution Approach 1:
The sealing element performs self-diagnosis and self-repair through the interactive coating that detects leakage automatically and triggers the secondary sealing lip without external sensors or control systems
Solution Approach 2:
The patent replaces electronic sensor-based leak detection with a chemical/physical mechanism where the interactive coating changes properties (swells, dissolves, or changes viscosity) in response to lubricant contact, mechanically activating the secondary seal
2Device complexity
If traditional sealing elements are used without passive response mechanisms, then the device complexity is reduced, but the ability to prevent lubricant escape into the environment deteriorates
Solution Approach 1:
The sealing element automatically responds to leakage by activating the secondary sealing lip through the interactive coating's reaction to lubricant contact, without requiring external intervention or complex control systems
Solution Approach 2:
The interactive coating changes its physical or chemical parameters (swelling, dissolving, viscosity change) when contacted by leaked lubricant, which mechanically activates the secondary sealing lip to prevent environmental contamination
3Extent of automation
If a passive automatic sealing mechanism is implemented, then the extent of automation is improved, but the device complexity increases due to additional components
Solution Approach 1:
The patent combines the primary sealing lip, interactive coating, and secondary sealing lip into a single integrated sealing element, eliminating the need for separate sensors, actuators, and control systems that would otherwise be required for automatic operation
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 provides a cost-effective, automatic, and environmentally friendly sealing mechanism that prevents lubricant escape into the environment, ensuring secure sealing without the need for additional sensors or parts, and allows for visible indication of seal failure.
Implementation Method 1
the activation element is a lipophilic, hydrophobic absorber, which is arranged between the shaft sealing surface and the shaft sealing ring on the shaft sealing ring and, by absorbing the outflow through the absorber due to an increase in volume of the absorber, a further sealant can be applied in a sealing manner to the shaft sealing surface
Implementation Method 2
EP 2 151 611 A, a swellable material being provided for movement in a preferred direction
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a sealing element that is provided stationary on a housing (1), comprising a sealing lip (5) that is pressed against a movable part, particularly a rotating shaft (2), by a reinforcing element, particularly a tubular spring (7), wherein an activation element (9, 10) made from lipophilic material is provided on the side of the sealing lip (5) turned away from the fluid side (4).