Helical Auger Self-Cleaning Screen for Suction Systems
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Solution Overview
Problem
Current suction devices for emptying pit latrines often clog due to larger items like garbage, rocks, and plant matter, which accumulate and bind with the driving mechanisms, necessitating a solution to exclude these items from the suction process.
Innovation Solution
A self-cleaning screen device with a hollow cylindrical screen and a helically shaped auger that rotates to sweep away larger items through the screen's openings, preventing clogging, and a suction system incorporating this device to efficiently remove human waste while excluding large items.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If suction devices are used to empty pit latrines, then waste removal efficiency is improved, but larger items accumulate and clog the driving mechanisms
Solution Approach 1:
The suction device is segmented into distinct functional zones: a screen section with openings that filters larger items from the waste stream, and a suction section that removes filtered waste. This segmentation allows the device to handle both liquid waste and solid debris separately, preventing clogging of the driving mechanisms while maintaining high waste removal efficiency
Solution Approach 2:
A screen acts as an intermediary element between the waste source and the suction mechanism. The screen captures larger items (garbage, rocks, plant matter) before they can reach and clog the driving mechanisms, while allowing liquid waste to pass through to the suction system. This intermediary structure resolves the contradiction by protecting the reliable operation of the suction device
2Reliability
If larger items are excluded from the suction device, then clogging is prevented, but device complexity increases with additional components
Solution Approach 1:
The screen and suction mechanisms are merged into a single integrated device structure. The screen is positioned within the suction device housing, and the driving mechanism serves both the screen rotation and the suction function. This merging approach prevents clogging while avoiding the need for completely separate filtering and suction systems, thus limiting the increase in device complexity
Solution Approach 2:
The driving mechanism is designed with multi-functionality, serving both to rotate the screen for filtering larger items and to power the suction system. This universal design approach achieves reliable clogging prevention without requiring additional dedicated components, thereby minimizing the increase in device complexity
3Productivity
If the auger rotates to sweep away larger items, then continuous operation is maintained, but energy consumption increases
Solution Approach 1:
The auger rotates continuously at a controlled speed to maintain the screen clean of accumulated larger items throughout operation. This continuous action ensures uninterrupted waste removal capability while the controlled rotation speed optimizes energy consumption, achieving continuous operation with reasonable energy use
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 self-cleaning screen device effectively prevents clogging by rotating the auger to sweep away larger items, ensuring continuous operation and efficient fluid flow, thereby maintaining the suction system's functionality and preventing damage from accumulated debris.
Implementation Method 1
The auger is helically shaped and has an auger central axis, an auger first end, and an auger second end opposite and axially spaced apart from the auger first end
Data Source
AI summary
Various implementations include a self-cleaning screen device including a screen and auger. The screen is a hollow cylinder and has a screen central axis, a screen inner surface, a screen outer surface opposite and radially spaced apart from the screen inner surface, a screen first end, and a screen second end opposite and axially spaced apart from the screen first end. The screen outer surface defines a plurality of openings extending radially to the screen inner surface. The auger is helically shaped and has an auger central axis, an auger first end, and an auger second end opposite and axially spaced apart from the auger first end. The auger is disposed around at least a portion of the screen outer surface such that the auger central axis and the screen central axis are coincident with each other. The auger is rotatable about the auger central axis relative to the screen.