Aerodynamic Blast Valve Blades for Shock and Suction Blocking
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Solution Overview
Problem
Existing blast valves, particularly louver type designs, face challenges in efficiently blocking both blast shock waves and subsequent return suction waves while maintaining optimal air flow capacity, often requiring complex trigger mechanisms or heavy construction that restricts air flow and necessitates human intervention.
Innovation Solution
A louver type blast valve featuring aerodynamically configured blades with a steep convex and shallow concave surface, hinged to rotate independently by air flow to block both blast shock and return waves, utilizing a frame with crossing round bars and a linkage system for synchronized blade operation, allowing for self-balancing and automatic return to the open state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional louver type blast valves are used, then air flow capacity is maintained, but the valve cannot rapidly block both blast shock waves and return suction waves without complex trigger mechanisms
Solution Approach 1:
The blade is designed to automatically activate and block blast waves through its own aerodynamic response to pressure changes, without requiring external sensors, power sources, or control mechanisms. The blade's asymmetric geometry enables it to self-activate during both positive pressure (blast shock wave) and negative pressure (return suction wave) phases
Solution Approach 2:
The blade's asymmetric cross-sectional geometry (convex on one side, concave on the other) creates different aerodynamic responses to positive and negative pressure changes. This geometric parameter design enables the blade to rotate in response to both blast shock waves and return suction waves, providing dual-protection functionality
2Strength
If heavy construction is used to maintain structural integrity, then strength is improved, but air flow capacity is restricted
Solution Approach 1:
The valve structure is divided into multiple independent aerodynamically configured blades that can rotate individually. This segmentation allows each blade to be lightweight while the collective arrangement provides sufficient structural integrity for blast wave blocking, maintaining high air flow capacity when open
Solution Approach 2:
The blade cross-section features asymmetric curvature with convex and concave surfaces optimized for aerodynamic response. This curved geometry provides structural strength through shape rather than mass, enabling lightweight construction that maintains integrity under blast loads while minimizing obstruction to air flow
3Ease of operation
If manual reopening is required after blast activation, then ease of operation is reduced, but device complexity is minimized
Solution Approach 1:
The blade automatically returns to its open position after the blast pressure passes, enabling self-reset functionality. This eliminates the need for manual intervention or complex reset mechanisms, as the blade's aerodynamic design allows it to respond autonomously to changing pressure conditions
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 enables rapid and automatic blocking of both blast waves and return suction waves without human intervention, maintaining high air flow capacity and minimizing the need for heavy construction, thus enhancing safety and operational efficiency in life-saving shelters.
Implementation Method 1
The aerodynamically configured blade accepts an elongated shape, including at least a steep convex surface and a flat or shallow concave surface, forming a leading edge and a trailing edge at the intersection of the surfaces. The blade being hinged to the frame about a longitudinal axis passing between the steep convex surface and the flat or shallow concave surface.
Data Source
AI summary
A louver type blast valve making use of an aerodynamically configured blade, independently activated by air flow to block a blast shock wave and a subsequent return suction wave. The blast valve (FIG. 6) including a frame and at least one aerodynamically configured blade, independently activated by air flow to block a blast shock and a potentially following return wave. The aerodynamically configured blade having an elongated shape, including at least a steep convex surface and a flat or shallow concave surface, forming a leading edge and a trailing edge at the intersection of the surfaces. The blade being hinged to the frame about a longitudinal axis passing between the steep convex surface and the flat or shallow concave surface.