Bypass Gas Flow Sensing for Accurate Low-Flow Quality Measurement
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Solution Overview
Problem
Existing fluid quality measurement devices face challenges in achieving accurate measurements, particularly with small flow rates, due to interference between sensors and contamination, which affects measurement accuracy.
Innovation Solution
A device comprising a main channel, bypass channel, sensor area, and primary anemometer, with a bypass channel diverting a portion of the main flow for parallel measurement by fluid quality and speed sensors, using guide elements to ensure uniform velocity and separate sensors to avoid interference, and incorporating additional sensors like Hall sensors and secondary anemometers to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are placed directly in the main flow path for measurement, then measurement coverage is improved, but sensor interference and contamination increase
Solution Approach 1:
The flow path is segmented into a main flow channel and a separate bypass measurement channel. The bypass channel diverts a portion of the main flow to the sensor area, allowing measurements to be taken without placing sensors directly in the main flow path. This segmentation resolves the contradiction by enabling measurement coverage while avoiding sensor interference and contamination from the main flow.
Solution Approach 2:
The bypass channel acts as an intermediary between the main flow and the sensors. It transports a sample of the main flow to the sensor area, enabling indirect measurement. This intermediary structure allows sensors to measure flow parameters without being exposed to the harmful conditions of the main flow, thus improving measurement accuracy while avoiding sensor interference and contamination.
2Object-affected harmful factors
If a bypass channel is introduced to separate sensors from main flow, then sensor interference is reduced, but device complexity increases
Solution Approach 1:
The bypass channel is designed to serve multiple functions: it diverts flow for measurement, provides a protected environment for sensors, and maintains pressure equilibrium. By combining these functions into a single structural element, the design reduces overall device complexity while still achieving the goal of reducing sensor interference.
Solution Approach 2:
The bypass channel and sensor housing are merged into an integrated structure. The bypass channel is formed as part of the housing that contains the sensors, combining the flow diversion function with the sensor protection function. This merging reduces the number of separate components and simplifies the overall device structure while effectively reducing sensor interference.
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
Improves measurement accuracy, especially with small flow rates, by reducing interference and detecting contaminants, allowing for precise fluid quality assessment with high reliability and cost-effectiveness.
Implementation Method 1
a primary anemometer (5) configured within the main channel (2) to detect the entire main flow (8)
Implementation Method 2
at least one speed sensor (12), wherein the sensor area (4) comprises evaluation electronics (13)
Implementation Method 3
The sensor area (4) comprises at least one fluid quality sensor (11)
Data Source
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AI summary
Device 1 for determining the volume flow and quality of a gaseous fluid, comprising a main channel 2, a bypass channel 3, a sensor area 4, and a primary anemometer 5, wherein the main channel 2 is configured to guide a main flow 8 of the fluid, wherein the bypass channel 3 and the sensor area 4 form a bypass 9 to the main flow 8, wherein the bypass 9 is configured in particular parallel to the main flow 8, wherein the bypass channel 3 is configured to direct a part of the main flow 8 as a partial flow 10 into the sensor area 4, wherein the sensor area 4 comprises at least one fluid quality sensor 11, at least one speed sensor 12, and evaluation electronics 13, wherein the primary anemometer 5 is configured within the main channel 2 to detect the entire main flow 8 and is operatively connected with the speed sensor 12.