Method for controlling a steam generating system for a domestic steam cooking oven and steam generating system
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Solution Overview
Problem
Existing steam generating systems for domestic steam cooking ovens experience temperature peaks and energy loss due to lack of water, requiring complex digital control units for temperature management.
Innovation Solution
A method utilizing a regulating thermal switch and a limiting thermal switch to control the steam generator and inlet valve, where the steam generator is deactivated and the inlet valve is activated by the regulating thermal switch when temperature exceeds its threshold, avoiding high temperature peaks and allowing for energy-saving water supply management through electromechanical elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a digital control unit with continuous temperature control is used, then temperature management is achieved, but device complexity increases
Solution Approach 1:
The patent replaces the digital control unit and electronic temperature control system with a purely mechanical bimetallic strip-based thermal switch. This mechanical system automatically opens or closes electrical contacts based on temperature changes, eliminating the need for complex digital sensors, microprocessors, and continuous control algorithms while achieving reliable temperature management.
Solution Approach 2:
The thermal switch system is self-regulating and automatically responds to temperature changes without external control signals. The bimetallic strip bends with temperature changes to open or close contacts, creating an autonomous control system that manages temperature without requiring complex digital intervention or continuous monitoring.
2Ease of operation
If the inlet valve is opened for a fixed time, then water supply is controlled, but temperature peaks occur when water is lacking
Solution Approach 1:
The thermal switch provides direct temperature feedback to the water supply system. When temperature rises due to insufficient water, the thermal switch automatically opens the inlet valve to supply more water. This closed-loop feedback mechanism dynamically adjusts water supply based on actual temperature conditions, preventing temperature peaks without requiring complex control algorithms.
3Duration of action of moving object
If the steam generator remains activated with minimal water, then operation continues, but energy is wasted
Solution Approach 1:
The thermal switch creates a periodic cycle of steam generator operation interrupted by water refilling phases. When temperature rises, the system automatically stops heating and opens the water inlet valve. This periodic on-off operation with automatic refilling prevents continuous operation with minimal water, eliminating energy waste while maintaining operational continuity through regular cycling.
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 solution effectively prevents temperature peaks and conserves energy by deactivating the steam generator when water is low, providing accurate control without the need for electronic circuits and ensuring efficient water supply, thus enhancing energy efficiency.
Implementation Method 1
a regulating thermal switch and a limiting thermal switch, which respond to a temperature within and/or at the steam generator
Data Source
AI summary
The present invention relates to a method for controlling a steam generating system (10) for a domestic steam cooking oven (40). A steam generator (26) and an inlet valve (16) are controlled by a regulating thermal switch (30) and a limiting thermal switch (32). The regulating thermal switch (30) and the limiting thermal switch (32) respond to a temperature within and/or at the steam generator (26). A threshold value of the limiting thermal switch (32) is higher than a threshold value (Ts) of the regulating thermal switch (30). The steam generator (26) is deactivated and the inlet valve (16) is activated by the regulating thermal switch (30), if the temperature (T) of the steam generator (26) exceeds the threshold value (Ts) of the regulating thermal switch (30).