Filter element and coffee machine
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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 filter material caking, reducing the performance and efficiency of the filter element due to unstable porosity and mixing of filter materials.
Innovation Solution
A staged filter element 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 a sealing assembly to prevent material mixing and caking, and equipped with a central pipe for improved water flow and filtration efficiency.
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 unstable porosity causes low water flow
Solution Approach 1:
The filter element is divided into multiple filtration layers with different functions: a pre-filtration layer (PP/PE sintered filter) for large particle removal and an end-stage filtration layer (microporous membrane) for fine particle removal. This segmentation allows each layer to optimize its specific function, preventing the pre-filtration layer from clogging while maintaining high water flow and stable porosity in the end-stage layer.
Solution Approach 2:
Different regions of the filter element have different structural properties tailored to their specific filtration needs. The pre-filtration layer has larger pores for coarse filtration, while the end-stage layer has smaller, more uniform pores for fine filtration. This local quality differentiation ensures optimal water flow through each zone while maintaining overall filtration effectiveness.
2Reliability
If PP or PE filter element is used, then filtration is achieved, but filter material caking and compaction occur after long-time service
Solution Approach 1:
The filter element separates the pre-filtration function (PP/PE layer) from the end-stage filtration function (microporous membrane layer). The PP/PE layer captures larger particles that would otherwise clog the microporous membrane, preventing material caking and compaction in the end-stage layer. This extends the service life of the critical filtration layer by protecting it from premature fouling.
Solution Approach 2:
The PP/PE sintered filter layer acts as an intermediary between the incoming water and the microporous membrane. It pre-treats the water by removing coarse particles, thereby protecting the microporous membrane from direct contact with particulate matter that would cause caking and compaction over time.
3Reliability
If mixture of resin and activated carbon is used in the filter element, then filtration and adsorption are provided, but material mixing causes caking
Solution Approach 1:
The filter element spatially separates the resin (in the pre-filtration layer) from the activated carbon (in the end-stage layer). This segmentation prevents direct mixing of the two materials, eliminating the caking problem that occurs when resin and activated carbon are combined. Each material maintains its structural stability while performing its specific function in its designated zone.
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
The staged filter element design enhances water flow and prevents filter material caking, extending the filter element's service life and improving the coffee machine's performance by maintaining water flow and filtration efficiency.
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
Figure 1
Figure 2
Figure 3~4
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.