Fume Hood Flapper Vortex Control and Weight Reduction
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Solution Overview
Problem
Existing fume hoods face challenges in maintaining vortex stability, energy efficiency, and ease of maintenance due to complex mechanisms and heavy counterbalance weights, which affect airflow and operational efficiency.
Innovation Solution
The implementation of an apparatus with a housing, air device, flapper, sensor, and computer processor to create an ultra-stable vortex with multiple turning vanes and an automated air-straightening flapper, along with a window system that eliminates counterbalance weights and provides full sash opening, suitable for both VAV and CAV applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If counterbalance weights are used for sash mechanism, then sash can be held at any position, but the overall weight increases by 20-30% making transport and installation difficult
Solution Approach 1:
The patent removes the counterbalance weight system entirely from the fume hood design. Instead of using weights to balance the sash, the invention uses a different mechanism that eliminates this heavy component, directly resolving the contradiction by extracting the problematic element while maintaining sash position control through alternative means
Solution Approach 2:
The patent replaces the traditional mechanical counterbalance weight system with an alternative mechanism that does not rely on heavy weights. This substitution eliminates the 20-30% weight increase while still enabling the sash to be held at various positions, trading the old mechanical approach for a more efficient system
2Reliability
If complex mechanisms are used for vortex formation, then containment performance improves, but maintenance difficulty and cost increase
Solution Approach 1:
The patent divides the vortex formation mechanism into separate, modular components including adjustable baffles and dampers that can be independently accessed and maintained. This segmentation allows each component to be serviced separately without requiring complete disassembly, resolving the contradiction between complex vortex formation and maintenance accessibility
Solution Approach 2:
The patent employs dynamically adjustable baffles and dampers that can be modified during operation to optimize vortex formation. These adjustable components are designed for easy access and reconfiguration, maintaining high containment performance while enabling straightforward maintenance and adjustment without complex fixed mechanisms
3Use of energy by moving object
If face openings are restricted to improve vortex formation, then energy consumption decreases, but face velocity control becomes difficult
Solution Approach 1:
The patent uses dynamically adjustable dampers and baffles that can be modified in real-time to optimize the balance between energy consumption and face velocity control. These dynamic elements allow the system to adapt opening restrictions based on operational requirements, achieving energy efficiency while maintaining controllable face velocity through active adjustment rather than fixed restrictions
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 achieves improved containment at low airflow, reduces maintenance costs, and minimizes weight by over 20%, providing a more efficient and safer fume hood operation with enhanced airflow management and reduced contaminant exposure.
Implementation Method 1
make a stronger vortex inside a fume hood chamber
Implementation Method 2
the computer processor controls the rate at which the flapper oscillates
Implementation Method 3
a sensor configured to sense total pressure within an inner chamber of a housing
Implementation Method 4
turning vanes fixed within the housing, which directs air flow within the housing to make a stronger vortex inside the chamber
Data Source
AI summary
An apparatus including a sensor configured to sense total pressure within an inner chamber of a housing, and to sense differential pressure between the inner chamber of the housing and work area outside of the housing; a computer processor configured to receive signals from the sensor based on the total pressure and the differential pressure; and wherein the computer processor controls the rate at which the flapper oscillates based on the total pressure signal from the sensor, to thereby control the direction of flow of air from the inner chamber of the housing through the plurality of openings of the blade, through the plurality of openings of the teeth, for optimum containment with ultra stable vortex inside the chamber; and controls the rate at which exhaust damper modulates based on differential pressure signal to maintain constant face velocity at the apparatus user opening and out an exhaust opening of the housing.