Ventilator Gas Flow Detection Using Segmented Filter Mesh
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Solution Overview
Problem
Existing gas resistance modules in ventilators suffer from low accuracy in measuring gas flow, particularly at low flow rates due to low output signals and low signal-to-noise ratios, which affects the reliability of ventilation treatment devices.
Innovation Solution
The apparatus includes a gas flow channel with detecting holes connected to a sensor module and a gas resistance module featuring a filter mesh structure with multiple ventilation regions, which increases the contact length with the gas flow, reducing the Reynolds coefficient and turbulence, thereby enhancing measurement accuracy without altering the gas resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a gas resistance module is used to detect flow data in a ventilator, then the flow measurement function is achieved, but the measurement precision deteriorates at low flow rates due to low output signal and low signal-to-noise ratio
Solution Approach 1:
The gas resistance module is segmented into multiple first gas resistance units and second gas resistance units that are arranged in parallel and crosswise respectively. This segmentation increases the number of detection elements without proportionally increasing the overall size, thereby improving the output signal strength and signal-to-noise ratio at low flow rates while maintaining the measurement function.
Solution Approach 2:
The gas resistance units are arranged in both longitudinal and transverse directions within the housing, transitioning from a single-dimensional arrangement to a two-dimensional spatial configuration. This dimensional change increases the contact length with gas flow and enhances the output signal without significantly increasing the device footprint, improving measurement precision particularly at low flow rates.
2Measurement precision
If the gas resistance module size is increased to improve low-flow detection, then the output signal increases, but the device complexity and size increase
Solution Approach 1:
The gas resistance module is divided into multiple first gas resistance units and second gas resistance units arranged in a grid-like pattern. This segmentation allows the detection function to be distributed across multiple smaller elements rather than requiring a single large component, improving low-flow detection accuracy while controlling overall device complexity through modular arrangement.
Solution Approach 2:
The multiple gas resistance units serve dual purposes: they collectively increase the output signal for low-flow detection while also providing redundancy and improved signal-to-noise ratio. This multi-functionality allows a single modular structure to address both detection accuracy and signal quality without requiring separate systems.
3Measurement precision
If a filter mesh structure with multiple ventilation regions is introduced, then the contact length with gas flow increases and measurement accuracy improves, but the device complexity increases
Solution Approach 1:
The filter mesh structure is segmented into multiple ventilation regions separated by partition walls, with each region containing gas resistance units. This segmentation increases the effective contact length between the gas flow and detection elements, improving measurement accuracy while maintaining a compact overall structure that does not excessively increase device complexity.
Solution Approach 2:
The gas resistance units are nested within the housing structure, with the filter mesh structure containing the gas resistance units which are arranged in both longitudinal and transverse directions. This nested arrangement maximizes the use of internal space, increasing contact length and measurement accuracy without proportionally increasing the external dimensions or overall device complexity.
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 design improves the accuracy of gas flow measurement, ensures stability across varying flow rates, and allows compatibility with both low-flow child mode and high-flow adult mode scenarios, expanding the usability of ventilation treatment devices.
Implementation Method 1
the length of the contact between the gas flow and the entity part on the overflow cross section is increased, the Reynolds coefficient is reduced
Implementation Method 2
the risk of gas flow turbulence is reduced, the stability of the gas flow is enhanced
Implementation Method 3
a differential pressure sensor is used to obtain a gas pressure difference at two ends of the gas resistance module
Data Source
AI summary
An apparatus for detecting gas flow and a ventilation treatment device. The gas flow channel is provided with at least two detecting holes along a length direction of the gas flow channel, and the two detecting holes are connected to the sensor module by gas paths; the gas resistance module is located in the gas flow channel and located between the two detecting holes; the gas resistance module includes a housing, and an outer wall of the housing attaches to an inner wall of the gas flow channel; an inner wall of the housing surrounds to be a gas passing channel, a filter mesh structure is disposed in the gas passing channel, and the filter mesh structure is connected to the inner wall of the housing; and the filter mesh structure includes an entity part configured for blocking gas and a plurality of ventilation regions separated by the entity part.