Rotatable Backwash Filter for Viscous Media
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Solution Overview
Problem
Existing backwash filters require large volumes of backwash liquid and high pressure differences, making them inefficient for highly viscous media and unsuitable for fine filter materials, as they are designed to clean the filter body over its entire length and circumference, leading to mechanical stress on the filter material.
Innovation Solution
The backwash filter design allows for a flow connection over only a partial area of the filter body's generatrix, using a rotatable or displaceable flushing agent discharge channel with a helical slot or radial opening, enabling efficient cleaning with a small pressure difference and allowing the use of cleaned medium as the backwash liquid, independent of the filtered medium's pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter body is cleaned over its entire length and circumference, then the filter body is thoroughly cleaned, but large amounts of backwash liquid are required and high pressure difference is needed
Solution Approach 1:
The patent divides the cleaning process into segments by introducing a displaceable flushing agent discharge channel that cleans the filter body in sequential sections rather than all at once. The channel can be positioned at different locations along the filter body's length, enabling section-by-section cleaning with a helical slot configuration that provides localized flushing action.
Solution Approach 2:
The flushing agent discharge channel is designed to be displaceable along the filter body's generatrix, transforming the static cleaning approach into a dynamic one. This movement capability allows the same channel structure to service different sections of the filter body, reducing the total flushing volume needed while maintaining comprehensive cleaning coverage.
2Reliability
If the filter body is cleaned over its entire length and circumference, then the filter body is thoroughly cleaned, but high pressure difference is required which puts heavy load on the filter material
Solution Approach 1:
By segmenting the cleaning process into localized sections through the displaceable channel design, the pressure difference requirement is distributed across multiple smaller cleaning zones rather than requiring high pressure across the entire filter body simultaneously. Each section receives adequate flushing pressure without overloading the filter material.
Solution Approach 2:
The patent applies partial action by cleaning the filter body in sections rather than all at once. The displaceable channel provides sufficient flushing action for each localized area it services, eliminating the need for excessive pressure that would be required to clean the entire surface area simultaneously.
3Reliability
If large amounts of backwash liquid are used, then the filter body is cleaned, but the efficiency of the backwash filter drops considerably
Solution Approach 1:
The displaceable flushing agent discharge channel enables dynamic cleaning that adapts to different operational requirements. By moving the channel to different positions along the filter body, the system maintains high filtering efficiency during operation while being able to perform thorough cleaning when needed, avoiding the efficiency drop associated with continuous large-volume backwashing.
Solution Approach 2:
The patent implements partial cleaning action that is sufficient for maintaining filter performance without the excessive liquid volumes that would reduce productivity. The displaceable channel provides targeted flushing where needed, maintaining high filter efficiency while achieving effective cleaning with minimal backwash liquid consumption.
4Reliability
If the flow connection is over the entire length of the generatrix, then complete cleaning is achieved, but the design complexity increases
Solution Approach 1:
Rather than creating a complex static structure that provides flow connection across the entire generatrix length, the patent uses a simple displaceable channel that can be moved to different positions. This dynamic approach achieves complete cleaning coverage through a simpler mechanical design, reducing device complexity while maintaining cleaning completeness.
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 significantly reduces the flushing volume required, enhances the efficiency of filter material cleaning, and increases throughput capacity while minimizing mechanical stress, allowing for the use of fine filter materials and handling highly viscous media with reduced pressure loads.
Implementation Method 1
enabling efficient cleaning with a small pressure difference
Implementation Method 2
which can be moved relative to the filter body and which can be brought into flow connection with the filter body over its entire length and over its entire circumference
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a backwash filter, especially for highly viscous media, comprising a filter body (2) forming a cylinder sheath in a housing (1), characterized in that the housing (1) and the filter body (2) can be rotated relative to each other about the axis of the filter body (2), wherein the filter body (2) separates a media supply chamber (14) from a media discharge chamber (16) and comprises a washing agent discharge channel (10) that extends along a generatrix of the filter body (2). According to the invention, said washing agent discharge channel can be moved relative to the filter body (2) and is in fluid connection with the filter body (2) over the entire length and the entire circumference thereof, thus forming a flow path opening into the washing agent discharge channel (10). In order to achieve an increased backwash efficiency, a higher throughput and in order to protect the filter material, said backwash filter is characterized in that the fluid connection is only established via a partial region of the longitudinal extension (20) of a generatrix of the filter body (2).