Fan unit and air treatment system including the same
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Solution Overview
Problem
Fan units face challenges in preventing backflow and efficiently controlling air volume due to varying duct resistance and differential pressure, making it difficult to maintain target air volumes and detect backflow occurrences without expensive sensors.
Innovation Solution
A fan unit system with variable rotation speed fans, casings, acquisition units, and control units that monitor and adjust rotation speed based on air volume, wind speed, and differential pressure to prevent backflow and maintain target air volumes, using mathematical equations to derive necessary rotation speeds and detect backflow without expensive sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a damper is used to prevent backflow, then backflow prevention is achieved, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical damper system with an electronic control system that uses sensors to detect backflow conditions and controls the fan motor to prevent backflow. The control unit monitors air flow direction and adjusts fan rotation speed accordingly, eliminating the need for mechanical dampers while achieving the same backflow prevention function.
Solution Approach 2:
The fan unit is equipped with sensors that automatically detect backflow conditions and trigger control actions without external intervention. The system self-monitors air flow parameters and self-adjusts fan operation to prevent backflow, making the system self-regulating and eliminating the need for manual damper operation.
2Measurement precision
If expensive sensors are used to detect backflow, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The patent employs sensors that serve multiple functions: they detect air flow direction for backflow prevention, measure air flow volume for efficiency optimization, and provide data for system diagnostics. This multi-functionality allows accurate backflow detection without requiring specialized expensive sensors, as the same sensors perform multiple measurement tasks.
Solution Approach 2:
The control unit continuously receives feedback from sensors regarding air flow conditions and adjusts fan operation in real-time. This feedback mechanism enables precise backflow detection through continuous monitoring of air flow parameters, allowing the system to maintain high measurement precision through intelligent processing rather than expensive hardware.
3Ease of operation
If manual adjustments are made to control air volume, then ease of operation is maintained, but productivity decreases
Solution Approach 1:
The system automatically controls air volume based on sensor feedback and pre-programmed parameters. The control unit independently adjusts fan rotation speed to maintain optimal air flow without requiring manual intervention, making the system self-regulating while improving response time and control precision beyond what manual adjustment can achieve.
Solution Approach 2:
The patent implements dynamic control of fan rotation speed based on real-time air flow conditions. The system continuously adapts fan operation to match actual system requirements, enabling rapid response to changing conditions and optimizing air volume control efficiency without the delays inherent in manual adjustment systems.
Data Source
AI summary
A problem to be solved by the present disclosure is to realize a fan unit capable of determining occurrence or non-occurrence of a backflow during operation. In a second unit, a second controller calculates front-rear differential pressure by substituting a rotation speed and a volume of air or a wind speed that can be acquired in real time into a relational expression. The relational expression derives, from two values of the rotation speed, the volume of air or the wind speed, and the front-rear differential pressure, the remaining one value. Then, the second controller determines that a backflow occurs if the calculated front-rear differential pressure is within a range that cannot occur under a normal condition. Therefore, the occurrence of a backflow can be detected without using an expensive pressure sensor or a directional wind speed sensor.