Screw Press Dewatering with Vacuum Filtration Along the Full Shaft
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Solution Overview
Problem
Existing dewatering devices face inefficiencies due to incomplete filtration in the initial sections of the screw filter press, requiring high pressure and leading to entanglement and re-waterlogging of substrates, which reduces drainage efficiency.
Innovation Solution
A dewatering device utilizing a screw shaft with a filter element and vacuum pump, where the substrate is pressed against a filter element by a rotating screw shaft, and vacuum is applied to expel liquid, with adjustable components for control and filtration enhancement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high pressure is applied by the feed pump to completely fill the screw filter press interior, then the filtration process is improved, but the substrate becomes waterlogged again in the rear section and entanglement occurs
Solution Approach 1:
The patent applies different operational conditions to different sections of the screw filter press. The front section operates under vacuum pressure to prevent entanglement and ensure complete filling, while the rear section operates under positive pressure for effective dewatering. This local differentiation of pressure conditions resolves the contradiction between complete filling and preventing re-waterlogging.
Solution Approach 2:
The patent implements periodic or alternating pressure conditions along the screw shaft. By creating a pressure gradient that transitions from vacuum at the front to positive pressure at the rear, the system periodically alternates between filling mode and dewatering mode along the substrate path, preventing both incomplete filling and entanglement.
2Ease of operation
If the screw shaft sections are spaced far apart to allow substrate movement, then substrate transport is improved, but filtration efficiency decreases due to incomplete filling
Solution Approach 1:
The patent applies vacuum pressure to the front section of the screw filter press to ensure complete filling of the interior space. This pneumatic approach allows the substrate to be drawn in and distributed evenly along the screw shaft sections, maintaining both transport efficiency and filtration effectiveness without requiring the substrate to be forced under high pressure.
3Productivity
If the screw shaft sections are spaced closely to increase compression, then dewatering efficiency is improved, but the substrate becomes waterlogged in the rear section
Solution Approach 1:
The patent applies positive pressure specifically to the rear section of the screw filter press where the screw shaft sections are closely spaced. This localized pressure application enhances dewatering efficiency in the compression zone without affecting the front section where substrate filling occurs, preventing re-waterlogging while maintaining high dewatering performance.
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
Achieves efficient dewatering along the entire length of the screw shaft, increasing dry matter content to 30% and allowing continuous operation with low energy consumption.
Implementation Method 1
the at least one vacuum pump (5) is fluidically connected to the at least one press assembly (2)... the at least one vacuum pump (5), which is fluidically connected to the at least one press assembly (2), generates a vacuum/negative pressure
Implementation Method 2
The substrate can be subjected to a pressing process by means of the at least one pressing arrangement (2)... the substrate is pressed against a filter element by a rotating screw shaft, and vacuum is applied to expel liquid
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a dewatering device and a method for dewatering substrate. It is therefore an object of the invention to eliminate the disadvantages of the prior art and to provide a dewatering device and a method for dewatering substrate, wherein the dewatering device and the method for dewatering substrate enable efficient dewatering along the entire length of a screw shaft. This object is achieved by the features listed in the claims.