Dynamic Sealing Device Test System with Reciprocating Shaft
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Solution Overview
Problem
Existing sealing device test methods fail to accurately simulate dynamic environments, where both chemical and mechanical stresses affect seal performance and longevity, leading to incomplete understanding of seal failure mechanisms.
Innovation Solution
A dynamic test system with a reciprocating shaft and seal assemblies within a controlled temperature environment, using axial force measurement sensors to monitor friction changes and fluid leakage, allowing for detailed analysis of seal fatigue, wear, and failure cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static sealing device testing is performed, then chemical compatibility can be assessed, but dynamic wear and motion effects cannot be evaluated
Solution Approach 1:
The patent transforms static testing into dynamic testing by implementing a reciprocating shaft mechanism that moves the sealing device back and forth within the bore. This allows the seal to experience actual motion and wear conditions while maintaining controlled chemical and thermal environments, thereby assessing both chemical compatibility and dynamic wear effects simultaneously.
Solution Approach 2:
The test system combines multiple testing capabilities into a single apparatus: it can assess chemical compatibility, evaluate dynamic wear, measure friction forces, and monitor seal failure under combined mechanical and chemical stresses. This multi-functional approach resolves the contradiction by enabling comprehensive seal evaluation in one unified test environment.
2Measurement precision
If dynamic testing with reciprocating motion is implemented, then wear and fatigue can be measured, but test system complexity increases
Solution Approach 1:
The patent replaces complex mechanical wear measurement systems with a simpler force measurement approach. By using a force sensor to measure the reciprocation force required to move the shaft, the system indirectly measures wear and friction effects without requiring complex displacement or surface analysis equipment, thereby reducing overall system complexity while maintaining measurement precision.
Solution Approach 2:
The force sensor acts as an intermediary that translates complex wear and friction phenomena into a single measurable parameter (reciprocation force). This mediator simplifies the measurement process by converting multiple wear mechanisms into a unified force signal that can be easily recorded and analyzed.
3Measurement precision
If force sensors are used to measure reciprocation force, then seal friction and wear can be quantified, but measurement system complexity increases
Solution Approach 1:
The test system uses the seal assembly itself to generate the measurement signal. The friction and wear forces between the seal and bore naturally produce a reciprocation force that can be measured by the sensor. The system does not require external force application or complex loading mechanisms—the seal's own interaction forces serve as the measurement source, simplifying the instrumentation required.
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
Enables precise measurement of seal performance degradation and failure in dynamic conditions, providing comprehensive data on seal durability and longevity under varying chemical and mechanical stresses.
Implementation Method 1
One or more force sensing devices, such as a load cell, load sensor, or similar, measures the force required to reciprocate the shaft
Implementation Method 2
Sealing devices, such as elastomeric O-rings, lip seals, and similar find extensive use in the vehicular and avionic system hardware
Data Source
AI summary
A dynamic testing system for sealing devices includes a shaft that is reciprocated in a bore through a body. The shaft includes a first seal assembly and a second seal assembly disposed a distance apart on the shaft. When the shaft is inserted into the bore, the first seal assembly and the second seal assembly form a fluid-tight seal between the external surface of the shaft and the internal surface of the bore—this forms a fluid-tight cavity between the seal assemblies. Sealing devices in each of the first seal assembly and the second seal assembly experience chemical attack and mechanical wear. One or more axial force measurement sensors measure the force applied by a prime mover to reciprocate the shaft within the bore. Data acquisition circuitry collects the force information and generates a graphical output that plots friction force against reciprocating cycle count.