Vertical Screw Press Filtrate Backflow Tank Segmentation
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Solution Overview
Problem
Existing screw presses, particularly those with horizontal and angled configurations, face inefficiencies in dewatering suspensions with low fiber content and are prone to clogging, requiring costly and complex maintenance.
Innovation Solution
A vertical screw press design featuring a cylindrical screen basket with a movable filtrate backwater tank and a double-bladed screw helix, allowing for easy cleaning and access to blockages, along with a dilution chamber for dissolving plugs and a bearing-free worm shaft for enhanced dewatering efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a horizontal screw press is used, then the structure is simple, but the dewatering efficiency is low for suspensions with fiber content below 8-10%
Solution Approach 1:
The patent inverts the conventional horizontal orientation by adopting a vertical screw press configuration. The screw shaft is arranged vertically with the inlet at the upper end and outlet at the lower end, allowing gravity to assist the dewatering process and enabling effective handling of suspensions with fiber content below 8-10% while maintaining structural simplicity.
Solution Approach 2:
The patent transitions from horizontal operation to vertical operation, utilizing the vertical dimension to improve dewatering efficiency. The vertical arrangement allows the screw helix to effectively compress and transport the suspension downward, enhancing productivity without significantly increasing device complexity.
2Productivity
If a vertical screw press is used, then the dewatering efficiency is improved, but the risk of clogging increases requiring disassembly for cleaning
Solution Approach 1:
The patent divides the screw press into separable components, particularly the screen basket and filtrate retention tank, which can be easily detached and removed. This segmentation allows quick access to blockages in the vertical screw helix without requiring disassembly of the entire press, maintaining ease of cleaning while preserving vertical configuration benefits.
Solution Approach 2:
The patent incorporates movable parts including a displaceable filtrate retention tank with larger diameter that can be moved vertically. This dynamic design enables easy access to the screw helix for cleaning operations while maintaining the vertical configuration that provides high dewatering efficiency during operation.
3Reliability
If a double bearing is used for the press screw, then the support is stable, but the cost and complexity increase
Solution Approach 1:
The patent removes one of the two bearings typically required in horizontal screw presses by utilizing the vertical configuration. The upper end bearing supports the screw shaft while the lower end is open, eliminating the need for a double bearing system and reducing both cost and complexity while maintaining adequate support stability through the vertical arrangement and plug mechanism.
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 design achieves high throughput and efficient dewatering while facilitating quick and easy maintenance, reducing the risk of clogging and costly repairs by allowing for the easy removal and replacement of parts.
Implementation Method 1
a press screw rotatably mounted in the screen basket via a drive, the press screw having a central screw shaft and a preferably double-winged screw helix arranged thereon extending at least over a large part of the screw shaft
Implementation Method 2
the conveying direction of the screw press runs from top to bottom
Implementation Method 3
a dilution chamber is provided at the upper end of the filtrate backflow container, wherein the dilution chamber may have at least one outlet opening. The dilution at the inlet can, for example, dissolve a blockage
Implementation Method 4
the screw shaft has openings, for example perforations, at at least one shaft end. This allows for high dewatering even at the inlet
Data Source
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AI summary
The invention relates to a vertical screw press (1) for separating solids, e.g. fibres, from a suspension, e.g. a pulp suspension, having a cylindrical screening basket (9, 10, 11), and a press screw mounted rotatably in the screening basket (9, 10, 11) via a drive (2) and having a central screw shaft (12) and a, preferably double-flight, screw helix (13) arranged thereon and extending at least along a majority of the screw shaft (12), wherein an inlet (8) for the suspension, an outlet (6) for filtrate and a discharge (7) for the dewatered solids are provided. It is primarily characterized in that the cylindrical screening basket (9, 10, 11) is surrounded by a filtrate backlog container (3, 4, 5), consists of a plurality of parts as seen in the axial direction, and at least one part, preferably the bottommost part (5), has a filtrate backlog container having a larger diameter, wherein the rotatable screw shaft (12) can be embodied in a reversible manner, wherein the inlet (8) for the suspension is provided at the top end and the discharge (7) for the dewatered solids is provided at the bottom end, with the result that the feed direction of the screw press (1) extends from top to bottom and wherein an outlet (6) for filtrate is provided at the bottom end of the filtrate backlog container (5). This enables both efficient dewatering and ready accessibility for cleaning and maintenance without taking apart the entire machine.