Steam Distribution Circuit With Staged Scale Filtration
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Solution Overview
Problem
Existing steam distribution systems in irons are prone to scaling, which leads to obstruction of filtration grids and a reduction in steam flow due to the formation of scale on high-temperature components, causing inefficiencies and reduced appliance lifespan.
Innovation Solution
A multi-filter steam distribution circuit with filtration grids of varying opening sizes and non-stick coatings to effectively retain scale particles, preventing them from reaching the steam outlet holes and minimizing scaling, comprising a first filtration grid with 1-2 mm openings, a second with 0.2-0.6 mm openings, and optionally a third with smaller openings, all coated with fluoropolymer materials or PTFE to prevent adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the filtration grid is placed at high temperature to evaporate water droplets, then steam production is improved, but scale film formation increases
Solution Approach 1:
A non-stick coating is applied to the filtration grid surfaces as an intermediary layer between the high-temperature environment and the scale-forming water droplets. This coating prevents scale film adhesion to the grid while allowing the grid to maintain its high temperature for effective steam production and water droplet evaporation.
2Reliability
If multiple filtration grids are used to improve filtration, then scale particle retention is improved, but device complexity increases
Solution Approach 1:
The filtration grids are arranged in a nested or sequential configuration within the steam distribution circuit, where the steam flow passes through multiple grids in succession. This nested arrangement allows effective multi-stage filtration without requiring separate external components, thereby improving filtration effectiveness while minimizing the increase in overall device complexity.
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 system ensures efficient steam flow by retaining scale particles within the appliance, preventing clogging, and maintaining performance over several years by minimizing scale formation and adhesion on filtration grids, thus enhancing user experience by preventing scale stains on linen.
Implementation Method 1
at least one of the first or second filtration grid is covered with a non-stick coating... the coating is made of fluoropolymer material
Implementation Method 2
a filter comprising passage openings calibrated to retain scale particles... the first filter being arranged at the level of the steam outlet opening
Implementation Method 3
a vaporization chamber for the production of steam, the steam produced by the vaporization
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The apparatus i.e. domestic iron has a steam distributing circuit for feeding steam to steam outlet holes, and including a filter (8) having openings sized to retain scale particles. The steam distributing circuit includes another filter (9) arranged in series with the former filter, where the latter filter is placed downstream of the former filter and includes openings smaller than the openings of the former filter. The widths of the openings of the former filter are between 1 mm and 2 mm, and the widths of the openings of the latter filter are between 0.2 m and 0.6 mm.