Heating device for heating liquids, evaporator for an electric cooking apparatus and method for operating a heating device
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Solution Overview
Problem
Existing heating devices for electric cooking appliances, particularly steam cookers, face inefficiencies in liquid heating and evaporation, with issues such as energy wastage, unreliable vaporization, and potential for overheating due to calcification and inadequate temperature monitoring.
Innovation Solution
A heating device with a cylindrical container featuring distributed flat heating elements, divided into separate operable circuits, and a combination of discrete and large-area temperature sensors for precise temperature monitoring, allowing for adjustable heating power and detection of malfunctions, calcification, and water level changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If heating elements are arranged in a distributed manner covering most of the container outside, then heating efficiency and temperature uniformity are improved, but device complexity increases
Solution Approach 1:
The heating elements are divided into at least three separate and/or separately operable heating circuits distributed over the container exterior. This segmentation allows independent control of different heating zones, improving overall heating efficiency and temperature uniformity while enabling selective operation to manage complexity.
Solution Approach 2:
The heating circuits are designed to be separately operable, allowing dynamic adjustment of heating power distribution across different zones. This enables the system to adapt heating intensity to local requirements, optimizing energy efficiency while maintaining manageable operational complexity through selective activation.
2Measurement precision
If multiple temperature sensors are provided on the outside of the container, then temperature monitoring precision and malfunction detection are improved, but device complexity increases
Solution Approach 1:
Multiple temperature sensors are distributed across the container exterior at different locations and heights, corresponding to different heating circuits. This spatial segmentation enables precise local temperature monitoring and early detection of malfunctions or calcification in specific zones without requiring a single complex monitoring system.
Solution Approach 2:
The temperature sensors provide continuous feedback on the thermal state of different container zones, enabling real-time monitoring and control adjustments. This feedback mechanism improves measurement precision and early malfunction detection while maintaining manageable complexity through decentralized sensing.
3Use of energy by moving object
If heating elements are divided into separate operable circuits, then energy efficiency and control flexibility are improved, but device complexity increases
Solution Approach 1:
The heating elements are divided into at least three separate and/or separately operable heating circuits, allowing independent control of different heating zones. This segmentation enables selective activation of only the required heating circuits based on actual demand, improving energy efficiency while managing complexity through modular control.
Solution Approach 2:
The separate operability of heating circuits enables dynamic adjustment of heating power distribution according to real-time requirements. This dynamic control allows the system to optimize energy consumption by activating only necessary heating zones while maintaining the flexibility to scale complexity as needed.
4Reliability
If temperature sensors are placed close to heating elements, then early detection of calcification and overheating is improved, but risk of sensor damage increases
Solution Approach 1:
Temperature sensors are positioned in close proximity to heating elements and heating circuits, enabling early detection of calcification and overheating conditions in specific zones. The segmentation of sensing locations allows targeted monitoring without requiring all sensors to be uniformly close to all heating elements, thereby managing exposure risk.
Solution Approach 2:
The distributed arrangement of temperature sensors provides early warning of thermal anomalies before they reach dangerous levels. This proactive detection enables preventive action to be taken, cushioning against the development of conditions that would otherwise cause sensor damage or equipment failure.
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
Enables efficient, reliable, and safe liquid evaporation with improved energy efficiency, reduced risk of overheating, and early detection of calcification, ensuring consistent steam generation and appliance performance.
Implementation Method 1
Heating elements are arranged in a distributed manner on an outside of a lateral container wall... Each of these heating circuits has at least one heating element... an elongate, meandering resistance track is provided as a temperature sensor
Implementation Method 2
heating device for heating liquids and/or for evaporating liquids... for steam generation by means of a heating device... the steam generated can escape upwards and is used in the cooking appliance for steam cooking
Data Source
Figure 1
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Figure 4
AI summary
Heating device for evaporating liquids for an electric cooking appliance, comprising a liquid container that is taller than it is wide, with heating elements distributed across the outer surface of one side of the container and multiple temperature sensors. There are at least three separate and independently operable heating circuits, each with at least one heating element. The multiple temperature sensors are of two types: the first type being discrete components mounted on the outer surface of the container, and the second type being applied as a continuous coating to the outer surface of the container.