Bar Screen Filter with U-Clip Mounting and Full-Length Rake Tines
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Solution Overview
Problem
Current bar screens face challenges in efficiently mounting teardrop-shaped bars for improved flow resistance while allowing for easy replacement, and in thoroughly removing debris, especially small particles trapped between bars, due to limitations in bar spacing and the strength of narrow bars.
Innovation Solution
The solution involves a bar screen assembly with elongate bars mounted using U-shaped metal clips that allow for easy attachment and detachment, and a rake with tines that extend from the leading edge to the trailing edge of the bars, ensuring thorough debris removal and accommodating slight deviations in bar alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If teardrop-shaped bars are used to reduce flow resistance, then flow resistance is improved, but mounting difficulty increases
Solution Approach 1:
The bar screen structure is divided into modular components: individual teardrop-shaped bars, separate mounting clips, and replaceable sections. This segmentation allows the complex teardrop bars to be mounted using simple clip mechanisms rather than complex welding or bolting, resolving the mounting difficulty while preserving the flow resistance benefits.
Solution Approach 2:
Mounting clips serve as intermediary components between the teardrop bars and the support structure. These clips simplify the mounting process by providing a standard interface that accommodates the teardrop shape without requiring complex attachment methods, thus resolving the contradiction between optimized bar shape and ease of mounting.
2Area of stationary object
If narrow bars are used to maintain flow area, then flow area is preserved, but bar strength decreases
Solution Approach 1:
The bar screen is divided into replaceable sections or individual bars that can be independently replaced. This allows the use of narrower, weaker bars in the screen structure while maintaining overall system strength through the support framework and enabling replacement of damaged bars without replacing the entire structure.
Solution Approach 2:
The bar screen structure transitions from a fixed, permanent installation to a dynamic system where individual bars or sections can be replaced as needed. This dynamic approach allows optimization of bar dimensions for flow area while relying on the replaceability feature to address strength concerns through maintenance rather than initial over-design.
3Stability of the object's composition
If bars are permanently affixed to ensure structural integrity, then structural integrity is maintained, but replacement capability is lost
Solution Approach 1:
The bar screen is segmented into modular units or individual bars that can be independently removed and replaced. Mounting clips or detachable connections provide structural integrity during operation while enabling easy replacement when bars become damaged, resolving the contradiction between permanent fixation and replaceability.
Solution Approach 2:
The mounting system transitions from a static, permanent attachment to a dynamic connection that provides both structural stability during operation and ease of replacement when needed. This is achieved through detachable mounting mechanisms that maintain integrity under normal conditions but allow quick replacement when bars are damaged.
4Reliability
If small bar spacing is used to capture small debris, then debris capture is improved, but flow area is reduced
Solution Approach 1:
The bar screen structure is segmented to allow for optimized bar spacing that captures small debris while maintaining adequate flow area. The modular nature of the bars and mounting system allows for customization of spacing based on specific application requirements, balancing debris capture with flow capacity.
Data Source
AI summary
Apparatus for removing debris from channeled water that includes a bar screen assembly. The assembly includes a plurality of spaced apart screen bars, each bar having an upstream edge and a downstream edge and distal ends to which U-shaped clips are attached. Each of the clips has a bar engaging portion and a cross member engaging portion that attaches to an associated cross member. The clips operate to space the trailing edge of the screen bars a predetermined distance from associated cross members and allow easy replacement of a bar. A continuous conveyor carries a plurality of rakes having a plurality of spaced apart tines which are adapted to fit between the screen bars as the rake is moved along the bars by the conveyor. The tines of the rake have a length that substantially spans the distance between the leading edge and trailing edge of a bar, so that tips of the rake tines extend to at least the trailing edge of an associated bar. Intermediate clips may be used to support the intermediate section of the screen bars.