Bent Overflow Pipe Diverts Water Flow to Reduce Aeration
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Solution Overview
Problem
Traditional high-level pools experience significant aeration issues due to a large drop height from the annular overflow weir, leading to bubbles entering the water outlet pipe and causing fluctuations in water pressure, which is detrimental to long-distance water supply pipelines.
Innovation Solution
A device featuring an inner and outer well with a baffle and bent overflow pipes that divert water flow into the inner well below the lowest operating water level, reducing aeration by preventing suction vortices and stabilizing water flow through strategic orifice placement and angles, and using a cover plate to control air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water flows through the annular overflow weir in a traditional high-level pool, then water supply function is achieved, but a large drop height causes serious aeration and bubbles to enter the water outlet pipe
Solution Approach 1:
The overflow structure is segmented into multiple overflow pipes instead of a single annular overflow weir. Each overflow pipe is equipped with individual control valves, allowing separate control of water flow from different locations. This segmentation enables optimization of each pipe's drop height and flow characteristics, reducing aeration while maintaining overall water supply function.
Solution Approach 2:
An air chamber is introduced as an intermediary component between the overflow pipes and the water outlet pipe. This air chamber captures and accumulates bubbles before they can enter the water outlet pipe, effectively mediating the harmful aeration effect. The air chamber acts as a buffer zone that separates the aeration process from the water supply system.
2Object-affected harmful factors
If the drop height from the annular overflow weir is reduced, then aeration is reduced, but the water supply head regulation capability is compromised
Solution Approach 1:
The overflow function is divided among multiple overflow pipes at different locations and heights. This allows the system to maintain water supply capability while reducing the drop height for each individual pipe, thereby reducing aeration. The segmented structure provides flexibility in water level regulation without requiring a large drop height.
Solution Approach 2:
Control valves are installed on each overflow pipe to dynamically adjust the water flow and water level. This dynamic control capability allows the system to adapt to different water supply requirements while maintaining optimized drop heights, preventing aeration without sacrificing regulation versatility.
3Reliability
If multiple overflow pipes are installed to reduce aeration, then water supply stability improves, but device complexity increases
Solution Approach 1:
The control valves installed on the overflow pipes serve multiple functions: they control water flow from each pipe, enable water level regulation, and provide isolation capability for maintenance. This multi-functionality reduces the need for additional separate control mechanisms, thereby limiting the increase in device complexity while achieving improved water supply stability.
Solution Approach 2:
The air chamber automatically captures and accumulates bubbles without requiring external intervention or complex control systems. The natural buoyancy of bubbles provides the self-service mechanism for aeration control, reducing the need for additional active components and simplifying the overall system despite having multiple overflow pipes.
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 effectively reduces aeration and water pressure fluctuations by ensuring a submerged water flow and minimizing suction vortices, thereby enhancing the stability and safety of the water supply pipeline.
Implementation Method 1
the overflow pipe is bent in the overflow groove to form a first bending part... one end of the overflow pipe is provided with a first pipe orifice in the overflow groove, the other end of the overflow pipe is communicated with the inner well to form a second pipe orifice
Implementation Method 2
the first bending part is higher than the first pipe orifice, so that water in the overflow groove can be introduced into the inner well through the overflow pipe only after the water depth reaches a certain depth, which can prevent a suction vortex
Implementation Method 3
one end of the overflow pipe communicated with the inner well is bent to form a second bending part, the overflow pipe penetrates through a side wall of the inner well to form the second pipe orifice, and the second bending part enables a fluid in the overflow pipe to be upwardly introduced into the inner well through the second pipe orifice
Data Source
AI summary
A device for diverting and defoaming with a bent pipe applied to a high head water supply structure includes an inner well, an outer well, a baffle, and a plurality of overflow pipes. The baffle is respectively connected with an outer wall of the inner well and an inner wall of the outer well to form an overflow groove, the top end of the inner well is higher than the baffle to form an overflow weir, one end of the overflow pipe is provided with a first pipe orifice in the overflow groove, the other end of the overflow pipe is communicated with the inner well to form a second pipe orifice, the first pipe orifice is higher than the second pipe orifice, the overflow pipe is bent in the overflow groove to form a first bending part, and the first bending part is higher than the first pipe orifice.