Ventilation Duct Sensor Tubular Body Outlet Positioning
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Solution Overview
Problem
Existing devices for sensing fluids in ventilation ducts are not reliable in detecting small amounts of gases and particles, leading to inaccurate registration of fluid contents.
Innovation Solution
A device with a tubular body having an inlet and outlet arranged to divert a partial flow of fluid, where the outlet is located upstream of the tubular body's downstream boundary, allowing a sufficient amount of fluid to pass through a sensing element and re-enter the duct, optimizing the pressure difference for enhanced entrainment and accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outlet is located at the downstream boundary of the tubular body, then the pressure difference is maximized, but the throughput of diverted fluid is insufficient for reliable detection
Solution Approach 1:
The outlet position is changed from the downstream boundary to an upstream location within the tubular body. This parameter change optimizes the balance between pressure difference and fluid throughput, allowing sufficient fluid to reach the sensing element while maintaining adequate pressure differential for effective operation.
2Measurement precision
If the tubular body dimensions are increased to improve sampling, then the detection accuracy improves, but the disruption to the main flow increases
Solution Approach 1:
Instead of using a large tubular body that would disrupt flow, the invention uses a smaller tubular body with an optimally positioned outlet. This partial action approach extracts sufficient fluid for accurate detection while minimizing interference with the main flow pattern in the duct.
Solution Approach 2:
The outlet position parameter is optimized to achieve sufficient sampling throughput from a compact tubular body, eliminating the need for large dimensions while maintaining detection accuracy and minimizing flow disruption.
3Productivity
If the outlet is positioned upstream of the downstream boundary, then the fluid throughput is sufficient for accurate sensing, but the pressure difference is reduced compared to downstream positioning
Solution Approach 1:
The outlet position is optimized to find the optimal compromise point where sufficient fluid throughput is achieved while maintaining adequate pressure difference for the sensing element to function effectively.
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
This configuration enables reliable and accurate detection of particles and gases in small amounts within the fluid, minimizing disruption to the main flow and ensuring thorough sampling across the duct's cross-section, thereby improving sensing accuracy and throughput.
Implementation Method 1
a desirable entraining effect through said tubular body and said housing arises owing to a pressure difference between the inlet and the outlet
Implementation Method 2
a desirable entraining effect through said tubular body and said housing arises owing to a pressure difference between the inlet and the outlet
Data Source
AI summary
A device is disclosed for sensing the contents of a fluid flowing in a duct system, such as in a ventilation duct. In at least one embodiment of the invention, the device includes a sensing element and a tubular body extending over a cross-sectional portion of the duct at issue and a supply duct with an inlet facing the main flow direction of the fluid and a discharge duct with an outlet located downstream of the inlet, to divert from the flowing fluid a partial flow which is made to pass the sensing element and then re-enter the duct. The outlet is located upstream of the downstream boundary of the tubular body.