Pressure Vessel Flow Control for Detention Ponds
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Solution Overview
Problem
Existing flow control systems for detention ponds and surge tanks rely on floats, springs, and flexible conduits, which are prone to failure due to factors like buoyancy loss, corrosion, and hydrostatic pressure, making them unreliable for maintaining constant fluid release rates.
Innovation Solution
A flow control system utilizing a pressure vessel with a vertical axis, enclosed by upper, lower, and vertical surfaces, where the lower surface is slideably engaged over the outlet end of a closed conduit, allowing fluid communication between the pressure vessel and a downstream drainage system, maintaining a constant release rate by adjusting to rising fluid levels without external energy or intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional flow control systems use floats, springs, and flexible conduits to maintain constant fluid release rates, then the system can adapt to varying upstream fluid levels, but the reliability of the system deteriorates due to buoyancy loss, corrosion, and hydrostatic pressure
Solution Approach 1:
The patent removes the unreliable components (floats, springs, flexible conduits) from the system and replaces them with a rigid pressure vessel that operates purely on pressure differential principles. This extraction of problematic elements while maintaining the flow control function resolves the contradiction between adaptability and reliability.
Solution Approach 2:
The patent replaces the mechanical float-spring-conduit system with a pressure-based rigid vessel system. The new system uses pressure differentials between upstream and downstream environments to drive fluid release, eliminating mechanical wear, buoyancy loss, and corrosion issues while maintaining constant flow rate capability.
2Reliability
If large volume storage is provided to control fluid at or below a certain level, then the fluid release rate can be controlled, but the cost of land acquisition, engineering, construction and transportation increases
Solution Approach 1:
The patent changes the operating parameters of the flow control system by using pressure differential as the driving force instead of relying on large storage volume. By adjusting the pressure vessel design and opening characteristics, the system achieves effective flow control with minimal storage requirements, directly addressing the contradiction between control reliability and storage volume.
3Productivity
If the release rate is allowed to increase exponentially with upstream fluid level using weirs and orifices, then the system responds automatically to level changes, but the storage volume required to prevent excessive release rates increases
Solution Approach 1:
The patent replaces the exponential flow characteristic of traditional weirs and orifices with a pressure-based flow control mechanism. The rigid pressure vessel maintains a more linear and predictable flow rate response to level changes, enabling faster response without requiring excessive storage volume to compensate for exponential flow increases.
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 system effectively controls fluid release rates by using ambient atmospheric pressure to move the pressure vessel, ensuring a consistent discharge even as upstream fluid levels fluctuate, thereby reducing the need for floats, springs, or flexible conduits and minimizing the risk of system failure.
Implementation Method 1
The system effectively controls fluid release rates by using ambient atmospheric pressure to move the pressure vessel
Implementation Method 2
The lower surface of the pressure vessel is slideably engaged, over the exterior of the downstream, outlet end of a closed conduit
Data Source
AI summary
An application for a flow control system includes a pressure vessel, positioned within the interior of a container which is fluidly interfaced to a downstream drainage system. The pressure vessel has at least one opening through its lower surface, through which it is slideably engaged over the exterior of a closed conduit which is in fluid communication with an upstream reservoir. There is no need for a seal between the pressure vessel and the closed conduit such that the interior of the pressure vessel is in fluid communication with the interior of the container. Additional openings, from the interior of the pressure vessel may also be provided. A means to restrain the pressure vessel from significant lateral movement is provided. As the fluid pressure rises in the pressure vessel in response to an increase in the fluid level in the upstream reservoir, the openings through the pressure vessel rise to prescribed level and the release rate of fluid into the downstream drainage system is maintained at a prescribed rate or range of rates as the fluid level continues to rise.