Spring-Biased Air Cleaner Damper for Positive Pressure Control
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Solution Overview
Problem
Existing air cleaners fail to effectively manage air flow between supply ducts and ambient room air, leading to inefficiencies in air pressure control and contamination prevention when the unit is off or on.
Innovation Solution
A damper arrangement that controls air flow between a closed loop supply duct system and ambient room air, allowing selective entry of room air and ensuring positive air pressure by being in fluid communication with both sources, with optional motorization or spring biasing, and adjustable louvers for precise air inlet management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the air cleaner unit is left off, then energy consumption is reduced, but air pressure control deteriorates allowing contamination to enter through the outlet
Solution Approach 1:
The air flow control is segmented into multiple dampers: a supply duct damper and a room air damper. This segmentation allows independent control of air sources, enabling the system to maintain positive pressure by blocking contaminated room air while allowing controlled supply air flow, thus maintaining reliability during off-hours without continuous energy consumption
Solution Approach 2:
The spring-biased dampers are pre-configured to automatically close when the fan stops, performing preliminary protective action before contamination can occur. This preliminary closing action maintains air pressure control and prevents contamination without requiring active energy consumption during off-hours
2Quantity of substance
If the damper is set to allow maximum room air entry, then air flow volume increases, but air quality deteriorates due to potential contamination from ambient air
Solution Approach 1:
The system applies different quality control to different air sources: supply duct air is treated as clean and prioritized, while room air is treated as potentially contaminated and controlled through a separate damper. This local quality differentiation allows maximum clean air flow while blocking contaminated air, resolving the contradiction between volume and quality
Solution Approach 2:
The room air damper acts as an intermediary control mechanism that selectively mediates between the need for air flow volume and the need to prevent contamination. By positioning this damper to control room air entry while maintaining supply air flow, it enables high volume clean air flow while blocking contaminated air paths
3Measurement precision
If the damper is motorized for precise control, then air flow control precision improves, but device complexity increases
Solution Approach 1:
The spring-biased damper design enables self-service operation where the dampers automatically respond to pressure differential changes without external control signals. The spring mechanism provides automatic closing force when the fan stops, and the dampers self-regulate based on air pressure conditions, achieving adequate control precision without motorized complexity
Solution Approach 2:
The invention replaces expensive motorized control systems with simple, inexpensive spring-biased mechanical dampers. While motorized dampers would provide higher precision, the spring-biased design achieves sufficient control precision for maintaining positive pressure while being far simpler and more cost-effective, trading minimal precision for dramatically reduced complexity
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 damper ensures continuous positive air pressure and prevents contamination by allowing controlled air flow from the supply duct while selectively allowing room air entry, maintaining air quality and pressure control.
Implementation Method 1
The damper may be motorized, or may be mechanically biased using a spring.
Data Source
AI summary
The invention is a damper that closes off supply duct air when the unit is off to prevent air from exiting through the outlet, and opens when the unit is on to allow room air and/or supply duct air to exit through an outlet. The damper may be either motorized or mechanically biased.