Gas Sensor Flow Fixture With Dual Grids for Uniform Calibration
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Solution Overview
Problem
Gas flow sensors at different locations receive varying volumes, velocities, and directions of gas flow due to manufacturing errors in vent caps and housings, affecting calibration accuracy and sensitivity.
Innovation Solution
A fixture with a cap structure defining a flow channel, including a first and second grid layer with specific opening distributions and shapes, is used to smooth gas flow to gas sensors, ensuring even velocity distribution and alignment with sensor dimensions to improve calibration efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vent caps are designed to send the same volume of gas to each gas flow sensor, then calibration efficiency is improved, but manufacturing errors cause different volumes, velocities and directions of gas flow to reach sensors at different locations
Solution Approach 1:
A flow smoothing fixture is introduced as an intermediary component between the vent cap and the gas sensor. This fixture includes a flow channel with a first grid layer and a second grid layer that actively regulate and smooth the gas flow, compensating for manufacturing errors in the vent cap and housing. The grid layers act as mediators to ensure uniform flow distribution regardless of upstream manufacturing variations.
Solution Approach 2:
The flow smoothing fixture changes the flow parameters (velocity, direction, distribution) of the gas as it passes through the flow channel and grid layers. By adjusting the flow parameters through the grid structure, the system compensates for manufacturing errors and ensures that each sensor receives gas with consistent parameters, thereby improving calibration accuracy without requiring perfect manufacturing precision.
2Loss of time
If multiple gas flow sensors are calibrated simultaneously, then calibration time is reduced, but flow resistance increases
Solution Approach 1:
The flow smoothing fixture divides the gas flow into multiple separate flow paths using the first grid layer and second grid layer. Each sensor receives gas through its own designated flow channel segment, allowing simultaneous calibration of multiple sensors without excessive flow resistance. The segmented structure enables parallel processing while maintaining manageable flow conditions in each channel.
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 fixture enhances the accuracy and sensitivity of gas sensor calibration by ensuring uniform gas flow, allowing for simultaneous calibration of multiple sensors without introducing excessive flow resistance, thereby improving calibration efficiency.
Implementation Method 1
the gas flow is smoothed by passing through the first grid layer through the plurality of first openings and the second grid layer through the plurality of first openings sequentially
Data Source
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AI summary
A fixture for smoothing a gas flow to a gas sensor is provided. The fixture includes a cap structure defining a flow channel, where the flow channel includes a chamber and an inlet connected to the chamber, and the flow channel is configured to transport the gas flow to the gas sensor; a first grid layer including a plurality of first openings and located in the chamber; and a second grid layer including a plurality of second openings and located in the chamber, where the gas flow is smoothed by passing through the first grid layer through the plurality of first openings and the second grid layer through the plurality of first openings sequentially.