Comminuting Device Bypass Flow and Brush Screen Clearance
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Solution Overview
Problem
Comminuting devices face challenges in achieving reliable comminution with reduced flow resistance, especially when dealing with liquids containing a high proportion of solids or strong fibers, which can lead to blockages and increased maintenance costs.
Innovation Solution
The comminuting device incorporates a bypass flow path and utilizes a brush element with multiple brush hairs to clear solids from screen wall openings, allowing for relative movement between the brush element and the screen wall to effectively remove blockages and maintain flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cross section for liquid flow is minimized to achieve high degree of fineness and small size of solids, then comminution efficiency is improved, but flow resistance increases
Solution Approach 1:
The device divides the flow path into two segments: a comminuting flow path through the shafts for fine comminution, and a bypass flow path through screen wall openings for larger solids. This segmentation allows different portions of the flow to take different routes based on solid size, reducing overall flow resistance while maintaining comminution efficiency for targeted particles.
Solution Approach 2:
The screen wall acts as an intermediary element that directs solids of different sizes into appropriate flow paths. Smaller solids pass through screen openings to the bypass path, while larger solids are directed to the comminuting path, enabling intelligent flow distribution that reduces resistance without compromising comminution quality.
2Reliability
If evacuating fingers are used to clear screen wall openings, then blockages are removed, but strong fibers accumulate and cause new blockages
Solution Approach 1:
The patent replaces the mechanical evacuating finger system with a brush element that uses bristles to mechanically engage with and remove fibers from screen openings. The brush hairs can penetrate into the openings and effectively capture and remove fibrous materials that evacuating fingers cannot handle, providing superior clearance reliability.
3Productivity
If the spacing between comminuting shafts is increased to reduce flow resistance, then flow resistance decreases, but device size and weight increase
Solution Approach 1:
The invention adds a dimensional solution by introducing a bypass flow path that runs parallel to the comminuting flow path. Instead of increasing spacing in the radial dimension, the bypass path utilizes the axial and circumferential dimensions through screen walls, allowing reduced radial spacing while maintaining low flow resistance through the alternative parallel pathway.
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 ensures reliable comminution with reduced flow resistance, effective clearance of solids from screen openings, and reduced maintenance complexity, even in applications with high solid proportions or strong fibers.
Implementation Method 1
a brush element with a multiplicity of brush hairs, the first screen wall and the brush element being movable relative to one another, and the brush hairs engaging at least partially into the screen wall openings in the case of relative movement of the brush element with respect to the screen wall
Data Source
AI summary
A comminuting device for solids-conducting liquids includes a housing with an inlet opening, an outlet opening and a housing interior space which extends from the inlet opening to the outlet opening. A first comminuting shaft arranged for rotation about a first comminuting shaft axis, and a second comminuting shaft arranged for rotation about a second comminuting shaft axis each extend through the housing interior space. A first screen device is arranged in the housing interior space adjacently with respect to the first comminuting shaft with a first screen wall having a multiplicity of slots. A first evacuating device with a plurality of evacuating elements which can be moved along a movement path relative to the screen wall extends through the plurality of slots on at least one portion of the movement path.