Leak Detection for Permeable Parts Using External Pipe Isolation
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Solution Overview
Problem
Existing leak detection methods for products with permeable zones are complex, require operator expertise, and yield inaccurate results due to deformation and small internal volumes, especially when testing for minor leaks.
Innovation Solution
A leak detection system with a main pipe communicating with the permeable zone, sealed by two seals, and a secondary pipe to minimize volume variation, allowing pressure variation and measurement of leak levels through differential pressure sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sealed component method is used to test parts with permeable zones, then the part can be hermetically sealed and tested in a test chamber, but the method requires operator expertise, performs teach-in cycles, and yields inaccurate results due to deformation and small internal volumes
Solution Approach 1:
The patent extracts the permeable zone from the test chamber environment by introducing a tubular element that connects the permeable zone directly to the external environment. This removes the need to hermetically seal the entire part in the test chamber, eliminating the complexity of teach-in cycles and operator expertise requirements while improving measurement accuracy for minor leaks.
Solution Approach 2:
The patent segments the testing system into distinct zones: the test chamber containing the part, the tubular element connecting to the permeable zone, and the reference chamber. This segmentation allows independent control and measurement of pressure variations in each zone, simplifying the overall test method and improving precision by isolating the measurement from deformation effects.
2Measurement precision
If pressure is varied in the test chamber to detect leaks, then leak levels can be measured, but volume variations and part deformation cause measurement errors
Solution Approach 1:
The patent introduces a reference chamber as an intermediary that experiences the same pressure variations as the test chamber but does not contain the part. By comparing pressure variations between the test chamber and reference chamber, the system eliminates errors caused by part deformation and volume changes, significantly improving measurement consistency and reliability.
3Adaptability or versatility
If the part is hermetically sealed for testing, then the test chamber can be pressurized, but parts with permeable zones cannot be properly tested as the permeable zones are blocked
Solution Approach 1:
The patent extracts the permeable zone from the hermetic sealing requirement by providing a dedicated pathway through the tubular element. This allows the permeable zone to maintain its intended function (gas permeability) while the rest of the part remains sealed for pressure testing, enabling accurate leak detection without blocking the permeable zones.
Solution Approach 2:
The tubular element serves multiple functions: it provides a sealed connection to the permeable zone, maintains atmospheric pressure reference, and allows direct leak measurement. This multi-functional design enables the system to handle various part configurations with permeable zones while maintaining high measurement precision.
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
Simplifies leak detection by isolating the part from the test chamber, reduces measurement errors, and provides accurate leak level determination with minimal volume displacement, suitable for parts with permeable zones.
Implementation Method 1
a device for measuring a physical quantity, such as a pressure or a flow rate, relative to a leak level
Implementation Method 2
the pressure is varied in a controlled manner in the test chamber (for example, by injecting a gas, such as air), and a pressure variation after a predetermined time is measured
Data Source
AI summary
The present invention relates to a system (20; 20′) for detecting leaks for a part having a permeable zone, said system comprising:a test chamber (22, 22′) configured to receive the part to be tested;a device (24) suitable for varying the pressure in the test chamber and/or in the part to be tested;a measuring device (26) for measuring a physical quantity representative of the leak level;characterised in that said system (20; 20′) comprises a main pipe (30) configured to cooperate with the permeable zone of said part, said main pipe (30) having one end (30a) which communicates with the permeable zone, while the other end (30b) of said pipe (30) opens outside the test chamber (22; 22′).