Tensioned Filter Element Structure for Stable Backflushing
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Solution Overview
Problem
Existing filter elements for separating solids from liquids and gases are prone to billowing during backflushing, leading to disrupted function and the risk of filter cakes adhering together, necessitating large and costly pressure vessels.
Innovation Solution
A filter element design featuring two perforated plates with spacers and a latching mechanism that allows plates to be displaced, increasing spacing and tensioning the filter covering to prevent billowing during backflushing, ensuring effective cleaning without plate warping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filter elements are arranged at large spacing in pressure vessels to prevent billowing during backflushing, then filter cakes do not stick together, but the pressure vessels become large and expensive
Solution Approach 1:
The filter element incorporates a displacement mechanism that allows the filter covering to be dynamically tensioned between two perforated plates. During backflushing, the plates can be displaced relative to each other to increase spacing and tension the filter covering, preventing billowing and filter cake adhesion. This dynamic adjustment eliminates the need for permanently large spacing between filter elements.
Solution Approach 2:
The invention changes the spacing parameter between perforated plates from a fixed large value to a variable value that can be adjusted between a smaller non-displaced state and a larger displaced state. This parameter change allows the system to achieve billowing prevention only when needed during backflushing, while maintaining compact dimensions during normal operation.
2Reliability
If filter coverings are tensioned to prevent billowing during backflushing, then cleaning function is maintained, but device complexity increases
Solution Approach 1:
The filter element is segmented into two separate perforated plates with spacers between them, rather than using a single rigid structure. This segmentation allows independent displacement of the plates relative to each other, enabling the filter covering to be tensioned effectively while keeping the overall structure manageable and modular.
Solution Approach 2:
The filter covering itself acts as an intermediary element that transmits the displacement motion between the two perforated plates into effective tensioning force. This intermediary mechanism converts the relative plate movement into the necessary tension to prevent billowing, maintaining backflushing function without requiring complex additional tensioning devices.
Data Source
AI summary
A filter element (5) for separating solids from liquids or gases is described, wherein the filter element (5) has a first perforated plate (1) and a second perforated plate (2), wherein the two perforated plates (1, 2) are arranged parallel to one another and are covered by a filter covering (3). In this case, the two perforated plates (1, 2) are displaceable in the longitudinal direction relatively to one another from a non-displaced state into a displaced state, and the plates (1, 2) have spacers (4) on the mutually facing inner sides, which spacers are constructed in such a manner that the spacing (D′) between the plates (1, 2) is larger in the displaced state than in the non-displaced state (D), so that the filter covering (3) is tensioned in the displaced state of the plates (1, 2). In addition, at least one latching element (6) is provided, which fixes the plates (1, 2) to one another in the displaced state.