Measurement device
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Solution Overview
Problem
Existing airflow measurement devices struggle to accurately measure airflow volumes and ventilation resistances across various ranges, particularly in devices like servers, information base stations, and fans, due to limitations in nozzle design and size, leading to inaccuracies and poor versatility.
Innovation Solution
A measurement device with a housing forming an air duct, featuring pressure sensors to measure static pressures before and after an opening member with a variable orifice, allowing for calculation and display of airflow volume and ventilation resistance, and incorporating a control unit to adjust the orifice size for optimal measurement across different airflow ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed nozzle design is used, then the measurement device can measure airflow within a limited range, but it cannot accurately measure airflow volumes across various ranges
Solution Approach 1:
The patent applies the dynamics principle by replacing the fixed nozzle design with a variable orifice mechanism that can dynamically adjust its opening size. The orifice member can change its opening area according to the measured airflow volume, allowing the device to adapt to various airflow ranges while maintaining measurement precision through optimal differential pressure generation at each range.
Solution Approach 2:
The patent implements parameter changes by varying the opening area of the orifice member based on the measured airflow conditions. By changing the geometric parameter (opening size) of the flow restriction element, the device can optimize the differential pressure signal for different airflow volumes, thereby achieving both wide adaptability and high measurement precision across various ranges.
2Adaptability or versatility
If multiple nozzles are used to cover various airflow ranges, then measurement versatility improves, but device complexity and cost increase
Solution Approach 1:
The patent applies the universality principle by designing a single orifice member that can perform multiple measurement functions across different airflow ranges. Instead of requiring multiple specialized nozzles for different ranges, the variable orifice mechanism allows one component to adaptively serve multiple measurement purposes, thereby reducing device complexity and cost while maintaining versatility.
Solution Approach 2:
The dynamic adjustment capability of the orifice member enables a single component to replace multiple fixed nozzles. By dynamically changing the opening size, the same orifice member can be optimized for different airflow ranges, eliminating the need for multiple static components and simplifying the overall device structure.
3Device complexity
If a single fixed orifice size is used, then the device structure is simple, but measurement precision varies across different airflow ranges
Solution Approach 1:
The patent resolves this contradiction by making the orifice size dynamic rather than fixed. The orifice member can adjust its opening area in response to measured airflow conditions, ensuring that the differential pressure remains within the optimal measurement range regardless of the actual airflow volume. This dynamic adaptation maintains high measurement precision without requiring an overly complex structure.
Solution Approach 2:
The patent changes the geometric parameter (opening area) of the orifice member based on measurement conditions. By adjusting this parameter dynamically, the device maintains optimal measurement precision across different airflow ranges while keeping the structural complexity manageable through a single adjustable component rather than multiple fixed components.
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 device achieves high versatility in measuring airflow volumes and ventilation resistances across various ranges, providing accurate and reliable data without the need for multiple nozzles, thus enhancing measurement precision and reducing costs.
Implementation Method 1
a difference pressure measuring pressure sensor installed at the front and rear sides of the nozzle for measuring a difference pressure between the front and rear sides of the same; An airflow volume is measured on the basis of the differential pressure of air between the first chamber and the second chamber
Implementation Method 2
the technique disclosed in JP-A-2005-207832 includes the nozzle, which generates differential pressure of air between the first chamber and the second chamber
Data Source
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AI summary
A measurement device for measuring an airflow volume of a wind-blowing apparatus includes, a housing that includes an air duct with an air inlet and an air outlet, the air inlet being configured to take in air, the air outlet being configured to send out the taken air, an opening member installed inside the air duct, the opening member including an opening allowing the air taken from the air inlet to pass therethrough, pressure sensors configured to measure air pressures before and after the air passes through the opening member in the air duct, and an orifice provided on the opening member to change a size of the opening.