Filter Candle Backflushing via Cylindrical Restriction
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Solution Overview
Problem
Existing filter candles for backflush filters do not efficiently clean the cylindrical filter wall during backflushing operations, as the fluid flow from the flushing section to the turbine section is not adequately restricted, leading to insufficient pressure drop and reduced cleaning action on the filter wall.
Innovation Solution
A cylindrical restriction is introduced on the outside of the flushing element at the transition position, with an outer diameter of at least 85% of the inner diameter of the filter wall, significantly restricting fluid flow from the flushing section to the turbine section, creating a lower pressure inside the filter candle and forcing already filtered fluid to flow through the turbine section for enhanced cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If fluid flow from flushing section to turbine section is not restricted, then cross-flow through filter wall is maintained, but pressure drop is insufficient and cleaning action is reduced
Solution Approach 1:
The flushing element is segmented into a flushing section and a turbine section by the cylindrical restriction. This segmentation restricts fluid flow between the two sections, creating a pressure drop that enhances the cleaning action on the filter wall while maintaining separate functional zones for flushing and turbine rotation.
Solution Approach 2:
The cylindrical restriction creates a localized flow restriction at the transition position between flushing and turbine sections. This local quality change ensures that pressure drop is concentrated where needed to enhance cleaning action, while other parts of the system maintain adequate fluid flow for their respective functions.
2Manufacturing precision
If cylindrical restriction with outer diameter at least 85% of inner diameter of filter wall is introduced, then pressure drop increases and cleaning action improves, but device complexity increases
Solution Approach 1:
The cylindrical restriction is merged with the flushing element structure, forming an integrated component rather than a separate part. This combining approach enhances cleaning action through the restriction effect while avoiding the complexity of additional separate components, assemblies, or adjustment mechanisms.
Solution Approach 2:
The cylindrical restriction is designed as a simple, fixed geometric feature of the flushing element that requires no moving parts, adjustments, or maintenance. This simple structural addition provides the needed pressure drop enhancement without introducing complex mechanisms that would increase device complexity or maintenance requirements.
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 design achieves a more efficient backflushing action by reducing cross-flow and increasing the pressure drop, resulting in a better cleaning action on the filter wall, ensuring effective filtration during both backflushing and normal filtering operations.
Implementation Method 1
a turbine section provided with a turbine adapted to rotate the flushing element
Implementation Method 2
an outside of the flushing element forms a cylindrical restriction at the transition position adapted to, during a backflushing operation, at least substantially restrict fluid flow from the flushing section to the turbine section
Data Source
AI summary
A filter candle (1) in a backflush filter housing (2) has a cylindrical filter wall (3) and includes an internal hollow flushing element (8) divided into a flushing section (9) having a flushing port (10) for backflushing and a turbine section (11) for rotation of the flushing element. The flushing section tapers from a first end to a second end. The turbine section tapers from a first end to a second end and has turbine blades arranged on the outside. The first end of the flushing section is connected to the first end of the turbine section at a transition position (21). An outside of the flushing element forms a cylindrical restriction at the transition position so that the part of the cylindrical filter wall of the filter candle extending at the turbine section may be backflushed by means of fluid also driving the turbine.