Omnidirectional Vent Cap for Low-Wind Tank Gas Extraction
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Solution Overview
Problem
Existing vent caps for recreational vehicle holding tanks require a minimum wind velocity to function effectively, failing to efficiently vent gases in low wind conditions and lacking omnidirectional functionality.
Innovation Solution
A vent cap design featuring a base with a sloping ramp surface and a top cover element with a convex lower surface, supported above the base, creating a low-pressure effect to draw gases from the exhaust passage, and optionally including radial vanes to focus air flow, allowing for 360-degree venting without moving parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rotating vent cap with wind vane is used to improve gas exhaust, then the venting efficiency is improved in windy conditions, but the device fails to function in low wind velocity conditions
Solution Approach 1:
The patent employs a rotating cap assembly that dynamically repositions itself based on wind direction and pressure differentials. The cap rotates to align the opening away from the wind source while maintaining connection to the vent pipe, enabling adaptive response to varying wind conditions without mechanical complexity
Solution Approach 2:
The patent replaces complex mechanical wind vane systems with a simplified rotating cap mechanism driven by wind pressure differentials and buoyancy forces. This substitution eliminates the need for minimum wind velocity thresholds while maintaining effective gas exhaust through passive aerodynamic principles
2Adaptability or versatility
If a wind vane vent cap is used to direct exhaust away from the vehicle, then the venting directionality is improved, but the device requires minimum wind velocity to pivot the vane
Solution Approach 1:
The patent utilizes asymmetric pressure distribution created by wind flow over the rotating cap surface to generate rotational force. The asymmetric geometry of the cap creates pressure differentials that drive rotation without requiring minimum wind velocity, enabling directional control in all wind conditions
Solution Approach 2:
The patent changes the operational parameters of the vent cap by allowing continuous rotation to any angle rather than fixed positional adjustments. This parameter change enables the system to respond to varying wind speeds and directions by adjusting the opening orientation dynamically, eliminating the minimum wind velocity requirement
3Device complexity
If a simple cap is used to prevent objects from entering the vent pipe, then the device complexity is minimized, but unpleasant odors accumulate in the holding tank
Solution Approach 1:
The patent transforms the static simple cap into a dynamic rotating cap assembly that actively responds to wind conditions. The rotating mechanism maintains the opening in positions that facilitate gas exhaust while preventing odor accumulation, achieving effective venting without complex additional components
Solution Approach 2:
The rotating cap assembly serves itself by using wind pressure differentials and buoyancy forces to drive its own rotation and positioning. The system automatically adjusts to vent gases effectively without requiring external power sources or complex control mechanisms, maintaining simplicity while eliminating odor problems
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
Enables efficient gas extraction from holding tanks and similar applications in any direction, even with low air movement, by creating a low-pressure area above the exhaust port, effectively reducing the need for significant wind velocity.
Implementation Method 1
having a convex lower surface extending at its lowest point below the outer edge to thereby in combination with the base cause a low pressure effect above the exhaust gas passage when air moves through the vent cap
Data Source
AI summary
An omnidirectional vent cap for venting holding tanks is provided. By providing a 360 degree venturi channel, the present invention can use a small movement of air to reduce the air pressure above the exhaust port to draw out vapors or gasses. Since the device is symmetrical about the central axis the movement of air can be from any direction relative to the device.