Steam Iron Filter with Low-Effusivity Coating to Reduce Scale Clogging
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Solution Overview
Problem
Existing steam irons suffer from clogging due to scale formation in filtration grids, leading to reduced steam flow and appliance inefficiency, as water droplets evaporate on the high-temperature grids, causing scale deposition and obstruction.
Innovation Solution
The use of filtration grids with low thermal effusivity materials like fluoropolymer-coated glass or stainless steel, featuring progressively smaller openings to retain scale particles, preventing large particles from reaching the steam outlet and minimizing scale adherence, with a non-stick coating to prevent clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filtration grid is used to retain scale particles, then scale particle retention is improved, but the filtration grid becomes clogged due to scale formation
Solution Approach 1:
The patent changes the thermal effusivity parameter of the filtration grid material from high (metal) to low (ceramic, glass, or plastic) to prevent water droplet evaporation and scale formation on the grid surface, thereby maintaining steam flow while retaining scale particles
Solution Approach 2:
The patent employs composite material structures combining filtration grid with low thermal effusivity materials (ceramic, glass, or plastic) that prevent scale adhesion, creating a multi-functional component that both filters scale particles and resists clogging
2Strength
If the filtration grid is made of metal with high thermal effusivity, then structural strength is improved, but water droplets evaporate on contact causing scale deposition
Solution Approach 1:
The patent fundamentally changes the thermal effusivity parameter from high (metal) to low (ceramic, glass, plastic) to prevent the evaporation of water droplets on the grid surface, thereby eliminating scale deposition while maintaining adequate structural strength through material selection and design
3Reliability
If multiple filtration grids with progressively smaller openings are used, then scale particle retention is improved, but device complexity increases
Solution Approach 1:
The patent segments the filtration function into multiple grids with progressively smaller openings arranged in series, creating a staged filtration system that captures scale particles of different sizes while maintaining overall system reliability
Solution Approach 2:
The patent arranges multiple filtration grids in a sequential spatial dimension along the steam flow path, with each subsequent grid having smaller openings, creating a dimensional progression that enhances filtration effectiveness without random 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
This configuration effectively retains scale particles, reduces scale formation, and maintains steam flow, ensuring the iron remains functional for extended periods without clogging, preventing scale particles from staining linen during use.
Implementation Method 1
the filter is made of a material having a thermal effusivity less than or equal to 14,000 J/(m 2 K 2 s 0.5)
Implementation Method 2
the filter consists of a filtration grid made of glass fabric coated with PTFE
Implementation Method 3
the non-stick coating is made of fluoropolymer material. According to another characteristic of the invention, the non-stick coating comprises PTFE
Implementation Method 4
a first filtration grid is carried by the closure plate... the first filtration grid is provided with openings of 1 mm to 2 mm on a side
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The appliance has a steam distribution circuit for distributing steam to steam outlet holes and comprising a filter formed of filter grids (8-10) to retain tartar particles. The filter is provided with an anti-adherent coating made of fluoropolymer material e.g. PTFE. The filter is made of a material possessing a thermal effusivity lower than or equal to specific value. The filter grids are made of glass fabric coated with the PTFE and stainless steel coated with the PTFE. One of the grids is provided with openings of 1-2 mm on a side. An independent claim is also included for a laundry iron.