Backflow Shutter Assembly for Orientation-Independent Airflow Sealing
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Solution Overview
Problem
Conventional backflow prevention units are ineffective when placed upside down, leading to air gaps and impaired heat-dissipating efficiency due to hindered shutter plate rotations and incomplete closure of airflow channels, resulting in short-circulation problems.
Innovation Solution
A backflow prevention device with a frame and shutter plates that can pivot to open or close airflow channels effectively in both upright and upside-down orientations, using extension walls and intermediate shutter plates to prevent airflow through gaps, ensuring complete closure without additional detectors or complex circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional backflow prevention units are placed upside down, then the device can be installed in different orientations, but the shutter plate rotations are hindered and air gaps occur preventing effective backflow prevention
Solution Approach 1:
The shutter plates are designed with asymmetric pivot points positioned at different heights relative to the airflow channel. When placed upright, the lower pivot point allows gravity to assist closure. When placed upside down, the upper pivot point configuration ensures the shutter plates can still rotate freely and seal the channel against gravity-induced gaps.
Solution Approach 2:
The invention inverts the conventional approach by designing the pivot mechanism to function effectively in both upright and inverted orientations. Rather than assuming a fixed installation position, the shutter plate geometry and pivot placement are specifically engineered to maintain sealing capability regardless of gravitational direction, effectively making the device orientation-independent.
2Reliability
If passive backflow prevention units use gravity forces and springs to control shutter plates, then the device structure becomes more complete, but the configurations and cost increase
Solution Approach 1:
The shutter plates are designed to utilize the airflow pressure differential and gravity forces naturally present in the system to achieve automatic opening and closing. The asymmetric pivot design allows the shutter plates to self-regulate their position based on flow direction and gravitational pull, eliminating the need for external springs, motors, or complex control mechanisms while maintaining reliable backflow prevention.
3Extent of automation
If conventional backflow prevention units use additional detectors and controlling circuits, then the automation control is improved, but the cost and complexity increase
Solution Approach 1:
The shutter plates are designed to utilize the airflow pressure differential and gravity forces naturally present in the system to achieve automatic opening and closing. The asymmetric pivot design allows the shutter plates to self-regulate their position based on flow direction and gravitational pull, eliminating the need for external springs, motors, or complex control mechanisms while maintaining reliable backflow prevention.
Solution Approach 2:
The invention replaces complex electromechanical control systems (detectors, motors, circuits) with a purely passive mechanical design. The asymmetric pivot mechanism translates airflow pressure and gravitational forces directly into shutter plate motion, achieving automatic control through mechanical means alone, which is simpler, more reliable, and cost-effective.
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 solution enhances flexibility and cost-effectiveness by preventing backflow in any orientation, minimizing air gaps, and maintaining heat-dissipating efficiency by ensuring complete closure of airflow channels, thus avoiding short-circulation issues.
Implementation Method 1
The passive backflow prevention unit uses gravity forces of the shutter plates (or springs) and the airflow pressure exerted on the shutter plates to control the open/close statuses of the shutter plates
Implementation Method 2
The passive backflow prevention unit uses gravity forces of the shutter plates (or springs) and the airflow pressure exerted on the shutter plates to control the open/close statuses of the shutter plates
Implementation Method 3
For effectively removing the heat, the power supply apparatus or the electronic device should be equipped with a forced convection mechanism to exhaust the heat to the ambient air
Data Source
AI summary
A backflow prevention device includes at least one backflow prevention unit. The backflow prevention unit includes a frame, a first edge shutter plate, a second edge shutter plate and plural intermediate shutter plates. The frame includes an airflow channel. If the first inner sidewall is disposed over the second inner sidewall, the first edge shutter plate and the plural intermediate shutter plates are configured to open or close the airflow channel, and the slab of the second edge shutter plate is inactive. Whereas, if the second inner sidewall is disposed over the first inner sidewall, the second edge shutter plate and the plural intermediate shutter plates are configured to open or close the airflow channel, and the slab of the first edge shutter plate is inactive.