Fan Unit Surging Detection Using Front-Rear Differential Pressure
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Solution Overview
Problem
Existing fan units face challenges in maintaining optimal air volume and preventing surging when connected to ducts with varying resistances, as conventional methods struggle to accurately adjust rotation speed based on changing duct resistance and air volume, leading to inefficiencies and potential equipment damage from pressure fluctuations.
Innovation Solution
A fan unit system with variable rotation speed, equipped with a casing, first and second acquisition units, and a control unit that determines surging by measuring front-rear differential pressure and air volume, allowing for precise adjustment of fan rotation speed to match target air volumes and prevent surging through advanced air volume control logic and calculus equations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pressure detection methods are used to determine surging, then the fan unit can detect pressure fluctuations, but the measurement precision is insufficient to accurately determine surging regions when duct resistance varies
Solution Approach 1:
The invention changes the parameters used for surging detection from simple outlet pressure to a combination of front-rear differential pressure and air volume. By using differential pressure (difference between inlet and outlet pressures) together with air volume measurements, the system achieves more accurate surging detection that accounts for varying duct resistance conditions without requiring overly complex control logic.
2Productivity
If the fan rotation speed is adjusted to meet required air volume, then the air treatment efficiency is improved, but the fan may operate in surging regions causing instability and equipment damage
Solution Approach 1:
The invention implements a feedback control mechanism where the control unit continuously monitors both the front-rear differential pressure and air volume, determines whether the fan is operating in a surging region, and adjusts the rotation speed accordingly. This feedback loop allows the system to maintain high air treatment efficiency by operating at optimal speeds while preventing surging-induced instability and equipment damage.
3Manufacturing precision
If trial runs are conducted to adjust fan settings for different duct configurations, then the air volume control accuracy is improved, but the time and labor requirements increase significantly
Solution Approach 1:
The invention enables the fan unit to automatically determine its own operating conditions and adjust its rotation speed without requiring external trial runs or manual calibration. The control unit uses real-time measurements of front-rear differential pressure and air volume to self-adjust the fan operation, eliminating the need for time-consuming trial runs while maintaining high air volume control accuracy across different duct configurations.
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 solution enables efficient air volume control and prevention of surging by accurately accounting for duct resistance changes, reducing the need for trial runs and minimizing man-hours, while ensuring reliable operation and reduced equipment stress.
Implementation Method 1
a first acquisition unit that acquires front-rear differential pressure that is a difference in air pressure between the intake port and the blow-out port of the casing
Data Source
AI summary
A problem to be solved by the present disclosure is to enhance the reliability of determination of occurrence or non-occurrence of surging. Whether or not surging occurs depends on front-rear differential pressure. Therefore, by determining occurrence or non-occurrence of surging on the basis of the front-rear differential pressure, a second unit can detect and avoid surging with higher accuracy than when determining by using the pressure on an outlet side of a second fan.