Conical Hollow Shaft Flushing Element for Backflush Filter
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Solution Overview
Problem
Existing backflush filters with cylindrical filter candles struggle to achieve high cleaning efficiency and uniform filtration area during the backflushing process, as the flushing elements often require complex rotary drives and may not effectively clean the entire peripheral wall of the filter candles.
Innovation Solution
The design incorporates a conical hollow shaft flushing element with a closed small end and an open large end, connected to a turbine wheel for rotation, allowing for high-speed counterflow cleaning along a narrow band-like flushing gap, ensuring efficient cleaning of the filter wall's inner face and maintaining uniformity across the filter candle's length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a multiplicity of cylindrical filter candles are arranged on a common pitch circle, then a larger available filter area can be achieved, but the backflushing process becomes more complex and cleaning uniformity deteriorates
Solution Approach 1:
Multiple flushing elements are integrated into a single rotating backflushing member that simultaneously cleans multiple filter candles. The backflushing member combines several flushing elements arranged radially, allowing one rotational movement to backflush multiple filter candles at once, thereby reducing operational complexity while maintaining large filter area.
Solution Approach 2:
The backflushing member serves multiple functions: it rotates to position different flushing elements, it delivers backflushing medium through multiple outlets, and it simultaneously cleans multiple filter candles. This multi-functional design reduces the number of separate components needed while achieving comprehensive cleaning of the large filter area.
2Ease of operation
If the flushing element is rotated without difficulty via an externally fitted rotary drive, then the backflushing operation is simplified, but the device complexity increases
Solution Approach 1:
The flushing element is designed to be rotatable within the filter candle without requiring complex external rotary drives. The simple rotational capability allows the flushing element to be positioned and operated easily, achieving ease of operation while maintaining relatively simple device structure through minimal mechanical components.
3Ease of operation
If both filter candle ends are open to allow movable cleaning element, then backflushing is enabled, but the structural integrity and filtration efficiency deteriorate
Solution Approach 1:
Instead of opening both ends for cleaning element movement, the invention maintains closed filter candle ends for structural integrity and opens only one end for backflushing. The backflushing medium is introduced through the open end, flows through the filter wall inwardly, and exits through the flushing element, achieving backflushing capability while preserving filtration efficiency through closed ends.
4Productivity
If a narrow band-like flushing gap is used for high-speed counterflow cleaning, then cleaning intensity is improved, but the coverage area decreases
Solution Approach 1:
The flushing element is designed to rotate, transforming a stationary narrow flushing gap into a dynamic cleaning system. The rotation allows the narrow gap to sequentially contact and clean different portions of the filter wall, achieving high cleaning efficiency at each position while covering the entire filter surface over one rotation cycle.
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
This configuration enhances the cleaning efficiency and intensity of the backflushing process, ensuring thorough cleaning of the filter wall's inner face with high-speed counterflow, even in longer filter candles, and maintains uniformity across the entire length, improving overall filtration performance.
Implementation Method 1
the flushing element being connected in torque proof manner for conjoint rotation to at least one turbine wheel, which serves as a driving member and is arranged in the filter candle
Implementation Method 2
a countercurrent with respect to the direction of filtration is generated in the backflushing process via a pressure difference between the clean side with filtered fluid and a flushing outlet of the backflushing device
Data Source
Figure 1
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AI summary
The invention relates to a filter candle for a backflush filter comprising filter candles and at least one backflushing member for filtering in particular seawater or saltwater, the candle having a cylindrical filter wall 34 through which fluid to be purified can flow, two filter candle ends 31, 32, an interior 35 enclosed by the filter wall, and at least one flushing element 40 in the interior, which is rotatable about a longitudinal axis L of the filter candle, is provided with a radially projecting flushing gap 45 for backflushing the filter wall. In order to improve the backflushing by high cleaning action, the flushing element 40 is rotatably mounted on the filter candle 30, is formed as a conical hollow shaft with a closed small shaft end 43 and with an axially open large shaft end 42, between which the flushing gap 45 extends, and is torque proof connected to at least one turbine wheel 51 as a driving member arranged in the filter candle. The invention also relates to a backflush filter comprising such candles.