Wall-mounted suction ventilator
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Solution Overview
Problem
Existing air exhaust systems for buildings and vehicles face issues with turbulent wind flows causing positive pressure infiltration, leading to uplift forces and mechanical failures, and are often complex and costly due to the use of moving parts and vulnerable designs prone to rainwater infiltration.
Innovation Solution
A simpler roof-mounted suction ventilator with a direct gas exit and rainwater-proof mechanisms, utilizing a venturi effect to create negative pressure for effective air relief, eliminating the need for moving parts and reducing drag, while preventing rainwater infiltration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a valve mechanism is added to prevent positive pressure infiltration, then the protection against positive pressure improves, but the device complexity increases and reliability decreases
Solution Approach 1:
The patent removes the valve mechanism entirely from the system. Instead of adding a valve to prevent positive pressure infiltration, the design relies on the inherent aerodynamic properties of the venturi structure and the natural pressure differential created by external wind flow, thereby eliminating the reliability issues associated with moving parts while still protecting against harmful pressure infiltration
Solution Approach 2:
The patent replaces the mechanical valve system with a passive aerodynamic design. The venturi structure creates negative pressure through fluid dynamics principles rather than mechanical action, and the rain cap with its specific geometry prevents positive pressure infiltration without requiring mechanical components, thus improving reliability by eliminating moving parts
2Object-affected harmful factors
If multiple turns of gas conduit are used, then rainwater infiltration is prevented, but the drag to gas flow increases and ventilation effectiveness decreases
Solution Approach 1:
The patent segments the rain protection function from the gas flow path. The rain cap is designed as a separate component that protects the exit opening without interfering with the direct gas flow. The gas conduit maintains a straight, short path while the rain cap's geometric segmentation (multiple surfaces and edges) provides rainwater diversion, thus preventing rain infiltration without adding drag to the gas flow
Solution Approach 2:
The rain cap acts as an intermediary element between the external environment and the gas exit. It provides rain protection through its geometric design that diverts water away from the opening, while the gas flow passes through the opening unaffected. This intermediary structure resolves the contradiction by protecting against rain without creating flow resistance
3Productivity
If complicated moving parts such as turbines and fans are used, then air exhaust capability is improved, but the cost increases and mechanical failure probability increases
Solution Approach 1:
The patent employs a self-service mechanism where the external wind flow itself provides the energy needed to create the suction effect. The venturi structure harnesses the kinetic energy of passing wind to generate negative pressure, eliminating the need for external power sources or moving parts. This self-powered approach maintains air exhaust capability while eliminating mechanical components that could fail
Solution Approach 2:
The patent replaces mechanical air moving devices (turbines, fans) with a passive aerodynamic system. The venturi effect creates airflow and negative pressure through fluid dynamics rather than mechanical action, and the rain cap geometry provides protection without moving parts, thus maintaining productivity while eliminating mechanical failure risks
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 ensures reliable, durable, and efficient air exhaust with zero energy consumption, low maintenance, and reduced material costs, providing effective ventilation under various wind conditions while maintaining rainproof and dustproof properties.
Implementation Method 1
By disposing the ventilator's exit opening or openings towards a contracted free space between a base body and a raised body, a venturi effect is created at the opening under natural wind where low-pressure, or so-called suction, draws air from inside the exit and into the external wind flow to be carried away.
Data Source
AI summary
A natural ventilator is herein disclosed that is free of moving parts, wind-activated, rain-proof, and free of dust or smog infiltration. It is not only suitable to be a standalone natural ventilator, but is also advantageous to be used as an enhanced exhaust exit in a forced-air ventilation system, for such enclosed spaces or objects as buildings and vehicles needing air relief. The ventilator assembly has rainwater-proof shapes or fixtures that serve to defend the vent system, and the interior space being vented, against rainwater invasion, even if raindrop trajectory becomes highly oblique from vertical as driven by strong winds. It also includes shapes or fixtures to prevent fume condensation from drifting outward and staining the exterior of a building or vehicle, or the like, that is being vented.