Siphonic Drainage Interface Curvature Prevents Gas Trapping
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Solution Overview
Problem
Siphonic drainage systems often experience delayed priming due to gas entrapment at transitions in pipe diameters or constrictions, leading to reduced drainage capacity and potential water accumulation on roofs, which can cause structural damage and safety hazards.
Innovation Solution
A siphonic drainage system with an interface portion that has a continuously increasing inner cross-sectional area from the inlet to the discharge end, preventing gas entrapment by allowing liquid to follow the interface portion and promoting faster priming, with transitions designed as smooth curves to facilitate this flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional pipe transitions with abrupt diameter changes or constrictions are used, then the system is easier to manufacture and install, but gas becomes trapped in the transitions preventing fast priming
Solution Approach 1:
The patent applies curved transitions instead of abrupt diameter changes. The interface portion has a continuously increasing inner cross-sectional area from inlet to discharge end, with transition curves having radii of at least 0.15 times the inner diameter of the discharge end. This curvature prevents gas entrapment by allowing liquid to follow the interface portion smoothly, eliminating the traps that would form at abrupt transitions.
Solution Approach 2:
The patent changes the geometric parameters of the pipe transition. Specifically, the inner cross-sectional area increases continuously along the length of the interface portion, and the transition curves have minimized radius values (at least 0.15 times the inner diameter of the discharge end). These parameter changes ensure that gas cannot be trapped while maintaining manufacturability.
2Reliability
If gas is trapped in the pipe system at transitions, then the siphonic mechanism is compromised and priming is delayed, but the system structure remains simple
Solution Approach 1:
The curved transition geometry with minimized radius ensures reliable siphonic action by preventing gas entrapment. The liquid can follow the curved interface portion smoothly, maintaining continuous flow and preventing the formation of gas locks that would compromise siphonic reliability.
Solution Approach 2:
The patent converts the potential harm of transition zones (where gas would normally be trapped) into a benefit by designing the interface portion with continuously increasing cross-sectional area. This design ensures that any gas present is pushed through the transition rather than being trapped, converting a potential failure point into a reliable flow path.
3Loss of time
If the interface portion has a large length to ensure complete gas prevention, then gas entrapment is fully prevented, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent establishes specific parameter ranges that balance effectiveness and manufacturability. The length of the interface portion is at least 0.3 times the inner diameter of the discharge end, and the transition curve radius is at least 0.15 times the inner diameter of the discharge end. These parameter specifications ensure adequate gas prevention while keeping the design practical for manufacturing.
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 rapid priming of the siphonic system by preventing gas accumulation, enhancing drainage capacity and reducing the risk of water accumulation on roofs, thereby ensuring safer and more efficient water management.
Implementation Method 1
In siphonic systems, where a liquid is driven through a pipe by means of the surrounding atmospheric pressure, it is important that the whole length of the pipe is filled with the liquid and that no gas gets trapped inside.
Implementation Method 2
where a liquid is driven through a pipe by means of the surrounding atmospheric pressure
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
An interface portion (1), for a siphonic system (6) which siphonic system (6) has an upstream portion (2) and a downstream portion (3), the interface portion (1) having an inlet end (10), to be in connection with the upstream portion (2), a discharge end (11), to be in connection with the downstream portion (3), the interface portion (1) being arranged to bring, in use, the upstream portion (2) in liquid connection with the downstream portion (3). The interface portion is distinguished by the inner cross section area of the interface portion (1) increasing continuously from the inlet end (10) to the discharge end (11) for a length (L) of the interface portion (1) that is at least 0.3 times the inner diameter (D) of the discharge end (11), so that the interface portion counteracts an accumulation of a gas downstream of the upstream portion (2), to facilitate priming of the system.