Staged Coffee Machine Filter Element to Prevent Caking and Flow Loss
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Solution Overview
Problem
The instability of polypropylene (PP) or polyethylene (PE) sintered filter elements in coffee machines leads to low water flow and caking of filter materials, reducing their performance and efficiency over time.
Innovation Solution
A staged filter element design with a perforated partition dividing the filter body into two chambers, one filled with adsorption filter material and the other with ion exchange material, separated by activated carbon and resin, which enhances filtration and descaling, and prevents material mixing and caking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PP or PE sintered filter element is used as the end-stage filter element, then filtration function is provided, but water flow becomes low and filter material cakes after long-time service
Solution Approach 1:
The filter element is divided into multiple filtration layers with different functions: a first filtration layer with larger pore size for macro filtration, and a second filtration layer with smaller pore size for micro filtration. This segmentation prevents caking by allowing different materials to perform specialized functions, maintaining water flow while providing reliable filtration.
Solution Approach 2:
Different filter materials are used in different regions/layers of the filter element. The first filtration layer uses a material optimized for macro filtration with larger pores, while the second filtration layer uses a material optimized for micro filtration with smaller pores. This local differentiation prevents uniform caking and maintains water flow through the macro filtration layer.
2Reliability
If filter material is mixed in the filter element, then comprehensive filtration is achieved, but filter material hardening and caking occur
Solution Approach 1:
The filter element is divided into distinct first and second filtration layers, each filled with different filter materials. The perforated partition physically separates these layers, preventing mixing of the filter materials while maintaining comprehensive filtration performance through the staged filtration approach.
Solution Approach 2:
A perforated partition is introduced as an intermediary structure between the first and second filtration layers. This partition allows water to pass through while physically preventing the filter materials in the two layers from mixing, thereby maintaining the stability and composition of each filter material.
3Duration of action of stationary object
If end-stage filter element is used for long-time service, then extended usage is achieved, but caking and compaction reduce performance and efficiency
Solution Approach 1:
The filter element uses a two-stage filtration structure where the first filtration layer with larger pores handles macro filtration and the second filtration layer with smaller pores handles micro filtration. This segmentation prevents uniform compaction and caking, allowing the filter to maintain filtration efficiency throughout extended service periods.
Solution Approach 2:
The filter element employs filter materials with different pore size parameters in different layers. The first filtration layer uses materials with larger pore sizes for macro filtration, while the second filtration layer uses materials with smaller pore sizes for micro filtration. This parameter differentiation prevents caking by distributing the filtration load across different pore structures.
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 improves water flow and extends the service life of the filter element by preventing material mixing and caking, ensuring consistent performance and efficiency in coffee machines.
Implementation Method 1
the first chamber is filled with an adsorption filter material
Implementation Method 2
the second chamber is filled with an ion exchange filter material
Data Source
AI summary
Provided is a filter element comprising a filter element body having a cavity, a water inlet and a water outlet, an end cap, and a perforated partition, and the perforated partition is configured to divide the filter element body into a first chamber filled with an adsorption filter material and a second chamber filled with an ion exchange filter materials. In the present disclosure, the filter element is divided into two stages, and the primary filter material and the softening filter material are filled separately, and functions of both filtration and descaling are realized, addressing the issues blocking of water and reduced water flow in the coffee machine using a PP/PE filter element. Meanwhile, reduction in water flow caused by the mixing of the filter materials and the caking of the filter material is also solved.