Steam Oven Drain Valve Layout for Power-Free Water Removal
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Solution Overview
Problem
Current steam ovens on-board aircraft lack effective draining features, as they either do not have a drain option or require power to operate, leading to water accumulation that can freeze and cause damage, and stagnation that promotes bacterial growth.
Innovation Solution
A power-free and automatic steam oven drain valve system that allows water to drain from the steam oven and associated lines without electrical power, featuring redundant valves and filters to prevent contamination and ensure safety, with drain valves opening automatically when the system is unpressurized to prevent freezing and bacterial growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a solenoid valve is used for draining the steam generator, then the drain function can be controlled, but electrical power is required to operate the valve
Solution Approach 1:
The drain valve system uses the existing water pressure differential and gravity to automatically open the valve when water level rises or pressure drops, eliminating the need for external power sources. The valve self-activates based on system conditions rather than requiring controlled operation.
Solution Approach 2:
The patent replaces the electrical solenoid valve system with a mechanically actuated valve that responds to pressure and gravitational forces. This mechanical substitution eliminates electrical power requirements while maintaining drain control functionality.
2Reliability
If water lines are drained when aircraft is unpowered, then freezing damage and bacterial growth are prevented, but water may not drain completely from lines behind vacuum break
Solution Approach 1:
The drain valve is positioned and configured to open before the vacuum break can prevent complete drainage. By establishing the drainage path early in the depressurization sequence, the system ensures water flows past the vacuum break point before air ingress stops the flow.
Solution Approach 2:
The drain valve acts as an intermediary component that facilitates complete water removal by providing a dedicated drainage path that bypasses the vacuum break limitation, allowing water to exit the system completely rather than leaving residual water in the lines.
3Reliability
If redundant drain valves are installed, then safety and reliability are improved, but device complexity increases
Solution Approach 1:
The drain system is segmented into multiple independent valve components positioned at different locations in the water system. Each valve handles a specific drainage function or location, providing redundancy without requiring a single complex multi-functional valve assembly.
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 effectively drains water from steam ovens and lines, preventing damage from freezing and bacterial proliferation, ensuring safe and reliable operation even when the aircraft is unpowered.
Implementation Method 1
drain valves opening automatically when the system is unpressurized
Implementation Method 2
water to drain out of steam ovens and associated water lines
Data Source
AI summary
Embodiments of the present invention provide steam oven drain valve systems and methods for draining steam ovens and associated water lines on aircraft and other passenger transport vehicles.