Sewage Lifting Screen and Valve Integration
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Solution Overview
Problem
Sewage lifting plants face issues with clogging and inefficient operation when handling large quantities of sewage containing solids, leading to potential overflow and premature pump activation without adequate liquid in the collection tank.
Innovation Solution
The arrangement of a separating screen and a combined shut-off/screening device at an angle, forming a structural unit with a connecting flange, ensures that only pre-cleaned wastewater reaches the liquid collection container, even if the separating sieve is heavily occupied with solids, using a shut-off valve and a screen with bars that act as a stop for the butterfly valve, and a bypass line for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single separating screen is used in the solids collection tank, then the pump can be designed smaller and more efficient, but the screen becomes clogged quickly when handling large quantities of sewage containing solids
Solution Approach 1:
The single separating screen is divided into two separate screens: a first separating screen in the solids collection tank and a second separating screen (shut-off/screening device) in the connecting line. This segmentation allows each screen to handle a portion of the solids, preventing rapid clogging while maintaining pump efficiency.
Solution Approach 2:
The second separating screen in the connecting line acts as an intermediary protective element between the solids collection tank and the pump. It catches solids that pass through the first screen, providing an additional barrier that prevents pump clogging without affecting the pump's size or efficiency.
2Reliability
If the separating screen is positioned to maximize solids retention, then pump protection is improved, but the liquid collection tank may not fill properly when solids accumulate on the screen
Solution Approach 1:
The solids retention function is segmented between two screens positioned at different locations. The first screen maximizes solids retention in the solids collection tank, while the second screen in the connecting line provides additional protection. This segmentation ensures that liquid can still reach the pump even when the first screen becomes heavily loaded with solids.
Solution Approach 2:
The second separating screen is positioned in advance in the connecting line to catch solids before they reach the pump. This preliminary action ensures that even if the first screen becomes clogged, the pump remains protected and liquid collection continues uninterrupted.
3Device complexity
If a single shut-off device is used in the connecting line, then waste water flow control is simplified, but it cannot prevent solids from entering the pump when the separating screen is clogged
Solution Approach 1:
The shut-off device and second separating screen are merged into a single integrated unit in the connecting line. This combination maintains simple flow control functionality while adding solids screening capability, preventing solids from entering the pump even when the first screen is clogged.
Solution Approach 2:
The combined shut-off/screening device performs multiple functions: it controls waste water flow like a traditional shut-off device and simultaneously screens solids like a separating screen. This multi-functionality provides both flow control simplicity and enhanced solids protection without requiring separate components.
Data Source
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AI summary
The invention relates to a sewage lifting plant having at least one collector tank (3) for barrier material having at least one separating screen (7) disposed in the interior thereof for sewage comprising barrier materials (F) to be passed through, and having at least one pump (5) connected downstream of the collector tank (3) for barrier material and connected to the collector tank (3) for barrier materials by means of at least one connecting pipeline (10) having a blocking device (8, 9). The blocking device (8, 9) is further designed as a combined blocking/screening device (8, 9).