Test Probe Throttling for Uniform Filter Leakage Detection
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Solution Overview
Problem
Existing test probes for filter leakage detection in gas filtration suffer from nonlinear air intake, leading to reduced sensitivity at the edges of the filter due to varying gas flow velocity along the probe, which affects the detection of leaks.
Innovation Solution
A test probe design featuring an elongated housing with a throttling portion between the inlet and outlet portions, which creates a lower vacuum upstream than downstream, ensuring more uniform gas flow velocity and increased sensitivity by distributing airflow evenly along the probe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an elongated test probe with multiple inlet holes is used to scan the filter area, then the probe can cover the filter surface, but the gas flow velocity through inlet holes varies with distance from the outlet, causing nonlinear air intake and reduced sensitivity at filter edges
Solution Approach 1:
The patent applies local quality by creating different vacuum levels at different locations within the probe. The throttling portion is positioned to generate a lower vacuum upstream compared to downstream, which compensates for the distance-dependent velocity variation. This local differentiation of vacuum conditions ensures that gas flow velocity remains relatively uniform across all inlet holes regardless of their position along the probe length, thereby maintaining consistent leakage detection sensitivity across the entire filter surface.
Solution Approach 2:
The patent changes the vacuum parameter along the length of the probe by introducing a throttling portion. By controlling the vacuum level to be lower upstream and higher downstream, the system modifies the gas flow characteristics to achieve uniform velocity distribution. This parameter change approach directly addresses the nonlinear air intake problem by actively managing the vacuum gradient rather than allowing it to vary naturally with distance from the outlet.
2Area of stationary object
If the test probe inlet covers a larger area to improve leakage detection across the filter surface, then more of the filter can be monitored, but the gas flow becomes more nonlinear and harder to control
Solution Approach 1:
The patent resolves this contradiction by applying local quality through spatially varying vacuum conditions. Different sections of the probe (upstream vs downstream of the throttling portion) operate under different vacuum levels, which compensates for the increased area coverage. This ensures that even though the probe covers a larger filter area, the gas flow velocity remains consistent across all inlet holes, maintaining measurement precision across the expanded coverage area.
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 enhanced sensitivity for detecting leaks across the entire filter surface by maintaining consistent gas flow velocity, improving the detection of leaks regardless of their location.
Implementation Method 1
the throttling portion is arranged to cause a lower vacuum upstream of the throttling portion than downstream of the throttling portion
Implementation Method 2
In an operative state where gas is sucked out of the outlet, the throttling portion is arranged to cause a lower vacuum upstream of the throttling portion than downstream of the throttling portion
Data Source
AI summary
A test probe for filter leakage detection. The test probe (1) has an elongated housing (5) with a longitudinal inlet portion for admitting gas into a first chamber of the housing through an inlet of the inlet portion, and an outlet portion for letting gas out of a second chamber of the housing through an outlet of the outlet portion. Further, the test probe has an intermediate element comprising a throttling portion. The intermediate element is arranged between the inlet portion and the outlet portion, wherein the first and second chambers are fluidly interconnected via the throttling portion, wherein the throttling portion is elongated and extends longitudinally of the housing, wherein the throttling portion is arranged to cause a smaller vacuum upstream of the throttling portion than downstream of the throttling portion when gas is sucked through the test probe.