Underground Ventilation Duct Control With Automated Branch Dampers
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Solution Overview
Problem
Current ventilation systems in underground environments face challenges in controlling airflow distribution in multiple duct branches due to difficulties in real-time measurement and manual, time-consuming adjustments, leading to oversizing of fans and increased power consumption, and the need for costly infrastructure for remote control.
Innovation Solution
An integrated ventilation system with automated flow control dampers, sensor modules, a connection panel, and display/control software that allows real-time monitoring and remote adjustment of airflow in each duct branch, eliminating the need for additional infrastructure and reducing manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual damper adjustment is used, then device complexity is reduced, but measurement precision and control accuracy deteriorate due to difficulty in real-time monitoring
Solution Approach 1:
The patent replaces manual mechanical damper adjustment with automated electronic control. Sensors detect airflow parameters and transmit data to a control system that automatically adjusts damper positions, substituting mechanical manual operation with an automated electromechanical system. This resolves the contradiction by accepting increased device complexity in exchange for precise real-time measurement and control.
Solution Approach 2:
The ventilation system implements self-service through automated feedback control. Sensors continuously monitor airflow conditions and the control system autonomously adjusts dampers without requiring manual intervention. The system serves itself by detecting deviations from target airflow and automatically correcting them, eliminating the need for human operators to physically access and adjust dampers.
2Ease of operation
If automated dampers with remote control infrastructure are installed, then ease of operation improves, but device complexity and cost increase due to required energy and command infrastructure
Solution Approach 1:
The patent implements a universal communication protocol and control architecture that can serve multiple dampers and sensors through a single infrastructure. The control system uses standardized digital communication buses that carry both command signals and sensor data, allowing the same infrastructure to handle multiple functions rather than requiring separate wiring for each damper actuator.
Solution Approach 2:
The patent merges power supply and communication functions into integrated control modules. The connection panels and control units combine multiple functions including sensor signal conditioning, damper actuator control, and communication interfaces in single devices, reducing the overall infrastructure complexity compared to separate systems for each function.
3Reliability
If fan is oversized to ensure sufficient airflow, then reliability improves, but use of energy increases due to higher power consumption
Solution Approach 1:
The patent implements dynamic fan speed control based on real-time airflow requirements. Instead of operating a constantly oversized fan at fixed high speed, the system uses variable frequency drives to adjust fan rotation speed dynamically according to actual ventilation needs detected by sensors. This allows the fan to operate at optimal speed for current conditions, reducing energy consumption while maintaining reliability.
Solution Approach 2:
The patent employs feedback control where sensors monitor actual airflow delivery and feed this information back to the control system, which adjusts fan speed accordingly. This closed-loop control ensures the fan provides exactly the airflow needed rather than continuously delivering excess airflow, eliminating waste and reducing power consumption while maintaining reliable ventilation.
4Object-affected harmful factors
If ducts are positioned on the roof to avoid collision, then safety improves, but ease of operation deteriorates due to difficult access for measurement and adjustment
Solution Approach 1:
The patent replaces mechanical access to roof-mounted dampers and sensors with wireless or cable-based electronic control systems. Operators can measure airflow parameters and adjust damper positions remotely from ground level or from control rooms, eliminating the need to physically access hazardous roof areas while maintaining full operational capability.
Data Source
AI summary
An underground ventilation system having a fan, a plurality of ducts for the delivery of air to an underground work space, flow control dampers at duct branches, a fan sensor module to detect velocity, pressure, temperature and/or humidity, a work space sensor in each work space, a connection panel in communication with the fan sensors and with each automated flow control damper and configured to exchange status and control information with the fan sensor, the flow control dampers, and work space sensors, a cabling system attached to the ducts and connected to the connection panel and to automated flow control dampers, and a display and control system in electronic communication with the fan, the fan sensor, the automated flow control dampers, and the work space sensors, via the connection panel.