Steam Soleplate Discharge Chamber for Dry Steam Output
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Solution Overview
Problem
Steam irons suffer from spitting due to water droplets being carried along with steam, caused by the compact design of condenser vessels and condensation issues, leading to water leakage during steaming.
Innovation Solution
A steam discharge unit with a barrier in the flow path and a hydrophobic surface near the outlet, which forces the water-steam mixture to change direction and prevents water droplets from reaching the outlet, ensuring effective retention within the chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the condenser vessel is made compact to fit inside the soleplate, then the device complexity is reduced and ease of operation is improved, but the residence time of water-steam mixture in the vessel is insufficient, causing water droplets to escape with steam
Solution Approach 1:
The patent introduces a vertical dimension to the flow path by adding a baffle plate that extends from the top wall toward the bottom wall, creating a multi-level flow path. This forces the steam to travel upward and then downward along the baffle, significantly increasing the effective path length without increasing the horizontal footprint of the compact vessel.
Solution Approach 2:
The baffle plate acts as an intermediary structure between the inlet and outlet, mediating the flow of water-steam mixture. It creates a controlled path that separates water droplets from steam through centrifugal force and extended residence time, allowing the compact design to achieve effective separation despite limited space.
2Reliability
If the barrier is positioned to block the direct flow path, then water droplet retention is improved, but the steam flow path length increases, potentially reducing productivity
Solution Approach 1:
The baffle plate is strategically positioned to create local flow disruption only where needed for water droplet separation. The barrier is not a complete obstruction but a localized structure that modifies flow characteristics in the critical separation zone while allowing steam to continue flowing efficiently toward the outlet through the upper and lower paths.
Solution Approach 2:
The baffle plate creates a curved flow path as steam moves around and along it, utilizing centrifugal force to separate water droplets from the steam flow. This curved path through the barrier region actually enhances separation efficiency while maintaining reasonable flow velocity and productivity.
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 combination of a barrier and hydrophobic surface prevents spitting by forcing water droplets to form larger drops that fall away from the outlet, maintaining dry steam discharge and enhancing heat transfer in a compact design.
Implementation Method 1
rotating motion is imparted to wet steam that is supplied to the cavity of the condenser vessel, so that water droplets are separated from the steam by centrifugal force
Implementation Method 2
GB-A-1 069 535 discloses evaporators with hydrophobic surfaces
Implementation Method 3
the water is discharged from the vessel or evaporated by heating
Data Source
AI summary
A steam discharge unit (1) comprises a chamber (10) for accommodating a flow of a water-steam mixture and heating the water-steam mixture, an inlet (11) to the chamber (10), and an outlet (12) from the chamber (10). In order to avoid water droplets from exiting the chamber (10) through the outlet (12) along with a flow of steam, special measures are taken, which comprise a barrier (20) arranged inside the chamber (10), in a flow path of a water-steam mixture from the inlet (11) to the outlet (12), and a hydrophobic surface (30) arranged preferably close to the outlet (12). In case water droplets remain inside the chamber (10) and tend to move towards the outlet (12), an actual release of the water droplets from the chamber (10) cannot take place by virtue of the presence of the barrier (20) and the hydrophobic surface (30) as mentioned.