Seal Testing System With Misalignment Assembly
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Solution Overview
Problem
Existing seal testing systems face challenges in efficiently validating seal designs under realistic conditions, as field testing is logistically difficult and lacks repeatability, while lab-based systems are limited in simulating multiple seal systems and varied environmental conditions simultaneously.
Innovation Solution
A seal testing system comprising multiple subassemblies with a drive system, rotating shaft, misalignment assembly, and gap adjuster, allowing for simultaneous testing of multiple seals under controlled rotational loads, misalignment, and media conditions, ensuring consistent wear parameters and environmental simulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If field testing is used to validate seal designs under realistic conditions, then the testing reflects actual operating conditions, but the testing process becomes logistically difficult and lacks repeatability
Solution Approach 1:
The patent introduces a laboratory-based testing system that serves as an intermediary between field conditions and controlled testing. The system uses a rotating shaft assembly with multiple seal testing subassemblies that can simulate various operating conditions (misalignment, gap variations, rotational speeds) in a controlled lab environment, eliminating the logistical difficulties of field testing while maintaining realism through adjustable parameters.
Solution Approach 2:
The system enables parameter changes by allowing independent adjustment of misalignment angles, radial gaps, rotational speeds, and media types in the laboratory setting. This provides repeatability and control while still simulating realistic operating conditions that would be difficult to reproduce in field testing.
2Reliability
If field testing is used to monitor seal performance, then actual seal behavior can be observed, but the testing process becomes time-consuming due to intermittent machine use
Solution Approach 1:
The laboratory testing system enables continuous operation of the seal testing apparatus without interruption by intermittent machine use. The rotating shaft assembly can maintain constant rotational speed and continuous media flow through the seal interfaces, allowing accelerated testing that completes in hours rather than months of intermittent field operation.
Solution Approach 2:
The system accelerates the testing process by rushing through the validation period that would naturally take months or years in field service. By using controlled misalignment conditions and continuous operation at elevated speeds, the system compresses time scales to achieve the same wear and failure modes in a fraction of the time.
3Productivity
If multiple seal systems are tested simultaneously, then testing efficiency increases, but the system complexity increases
Solution Approach 1:
The system divides the testing apparatus into multiple identical seal testing subassemblies (first subassembly, second subassembly, etc.), each with its own seal interface but sharing common drive and support structures. This segmentation allows parallel testing of multiple seals while maintaining individual control over each seal's specific conditions.
Solution Approach 2:
The patent merges multiple seal testing subassemblies onto a single rotating shaft, combining drive mechanisms, support structures, and media delivery systems. This consolidation achieves high productivity through simultaneous testing while controlling complexity by using standardized, repeating modular units rather than entirely separate test rigs.
4Reliability
If various misalignment conditions are applied to seals during testing, then seal wear patterns under realistic conditions are reproduced, but the difficulty of controlling and replicating misalignment increases
Solution Approach 1:
The system transitions from static misalignment simulation to dynamic control by using adjustable mechanisms that can precisely set and maintain specific misalignment angles during rotation. The first and second stationary members can be independently positioned relative to the rotating shaft to create controlled angular misalignment, and these positions can be precisely replicated across multiple tests.
Solution Approach 2:
The system enables precise parameter changes in misalignment angles by using adjustable stationary members that can be positioned at specific angular offsets from the rotating shaft centerline. This allows systematic variation of misalignment parameters (0 degrees, 1 degree, 2 degrees, etc.) with precise control and repeatability, making it easier to study the effects of different misalignment conditions.
Data Source
AI summary
A seal testing system includes a drive system and a rotating shaft driven by the drive system. The system further includes a first seal testing subassembly including a first rotating member coupled to the rotating shaft, a first stationary member located adjacent the first rotating member, and a first test seal disposed between the rotating member and the stationary member at a first seal interface; and a second seal testing subassembly including a second rotating member coupled to the rotating shaft, a second stationary member located adjacent the second rotating member, and a second test seal disposed between the rotating member and the stationary member at a second seal interface. The system additionally includes a misalignment assembly coupled to the first and second stationary members to move the first and second stationary members the same distance to provide an equal misalignment at the first and second seal interface.