Measurement probe for measuring pressure inside air duct and measurement system for measuring pressure difference
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Solution Overview
Problem
Traditional air pressure measurement units in air ducts struggle to accurately measure pressure near flow disturbances, such as duct turns, and require significant space to function effectively, leading to inefficiencies in air flow control.
Innovation Solution
A measurement probe with a wall extending from the top surface to the bottom surface, featuring a hole connected to an air channel and pressure sensor, is designed to be installed near air flow disturbances, enhancing pressure difference measurement and protection from flow disturbances by positioning the wall in various orientations relative to the airflow direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional pressure sensors are installed near flow disturbances to measure pressure, then measurement precision is improved, but the sensors are affected by harmful factors from flow disturbances
Solution Approach 1:
A wall structure is introduced as an intermediary element between the pressure sensor and the flow disturbance. The wall extends from the top surface to the bottom surface of the measurement probe, creating a physical barrier that protects the sensor opening from direct exposure to turbulent flow while still allowing pressure transmission. This mediator structure enables the sensor to measure pressure accurately without being directly affected by harmful flow disturbances.
Solution Approach 2:
The measurement probe design adds a dimensional element by extending a wall structure in the vertical direction (from top surface to bottom surface) around the sensor opening. This three-dimensional configuration creates a protected measurement zone that shields the sensor from lateral flow disturbances while maintaining pressure sensing capability, effectively using spatial dimensionality to resolve the contradiction between proximity to disturbance and protection from it.
2Reliability
If safety distance is increased after flow disturbances to protect sensors, then reliability is improved, but the device complexity and space requirements increase
Solution Approach 1:
The measurement probe is segmented into distinct functional zones: a protected measurement zone where the pressure sensor is located behind the wall structure, and an exposed zone where the wall extends to face the flow disturbance. This segmentation allows the sensor to be positioned close to flow disturbances without direct exposure, eliminating the need for large safety distances while maintaining measurement reliability.
Solution Approach 2:
Instead of increasing the longitudinal distance (safety distance) from flow disturbances, the design uses a vertical wall extension that creates a protected zone in a different spatial dimension. This approach achieves the same reliability goal without increasing the overall space requirements or device complexity along the flow direction.
3Reliability
If wall height is increased to improve protection from flow disturbances, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The wall height parameter is optimized to a specific range (3-15 mm from the top surface) that provides sufficient protection from flow disturbances while remaining manufacturable with standard tolerances. This parameter change balances the need for protection with the practical constraints of manufacturing precision, avoiding excessive wall heights that would require tight tolerances.
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 allows for more reliable pressure measurement near air flow disturbances, improving air flow control by accurately measuring pressure differences and reducing the need for extensive space, thereby enhancing the precision and efficiency of ventilation systems.
Implementation Method 1
The advantage of the device is that the pressure difference measurement is enhanced, and the pressure measurement is better protected from flow disturbances
Data Source
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AI summary
A measurement probe (1) for measuring air pressure inside an air duct, which measurement probe is arranged to be installed to a wall of a damper having at least one damper blade or to a wall of an air duct in which the damper is installed, wherein the measurement probe comprises - a top surface (2) and a bottom surface (3), - a measurement point (4) comprising a hole (5) extending from the top surface to the bottom surface, which hole is arranged to be connected to an air channel and further to a pressure sensor, characterized in that - the measurement probe comprises a wall (10) next to the hole (5), wherein the wall extending is from the top surface (2).