Kettle Heater Control Using Temperature Thresholds and Level Sensing
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Solution Overview
Problem
Existing electric kettles can cause injury due to rapid boiling and spurt of liquid when the temperature exceeds the boiling point, as they lack efficient control mechanisms to manage power delivery and liquid levels.
Innovation Solution
Implementing a system that adjusts power delivery to the heater based on predetermined temperature thresholds, duty cycles, and liquid level detection, ensuring safe boiling by applying full power below the boiling point, partial power above it, and removing power when boiling is confirmed or if the liquid level is unsafe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full power is applied to the heater to heat the liquid quickly, then heating efficiency is improved, but the liquid may fast boil and spurt out causing injury to the user
Solution Approach 1:
The patent applies dynamic control of heater power based on real-time temperature feedback. The controller adjusts power delivery from full power to reduced power as the liquid approaches boiling point, creating a dynamic response that maintains heating efficiency while preventing dangerous spurt conditions
Solution Approach 2:
The patent implements a feedback control system where the temperature sensor continuously monitors liquid temperature and feeds this information to the controller. The controller uses this feedback to adjust heater power levels, ensuring the liquid is heated efficiently while automatically reducing power before dangerous boiling occurs
2Object-affected harmful factors
If temperature control is implemented to prevent fast boiling, then user safety is improved, but the heating process becomes more complex
Solution Approach 1:
The patent employs a self-regulating control system where the temperature sensor and controller work together to automatically adjust heater power without user intervention. The system monitors its own state and makes necessary adjustments, providing safety while maintaining operational simplicity for the user
Solution Approach 2:
The patent replaces complex mechanical control mechanisms with an electronic control system using a temperature sensor, microcontroller, and electronic switching. This substitution provides precise temperature control and safety features while actually reducing mechanical complexity and improving reliability
3Object-affected harmful factors
If power is removed early to prevent spurt, then safety is improved, but the liquid may not reach full boiling temperature
Solution Approach 1:
The patent applies partial power to the heater rather than complete power removal when approaching the boiling point. This partial action maintains sufficient heat input to achieve boiling temperature while preventing the excessive heating that causes dangerous spurt conditions
Solution Approach 2:
The patent uses periodic duty cycle control where the heater is switched on and off in controlled intervals. This periodic action allows the liquid to reach boiling temperature through cumulative heating while preventing continuous excessive heating that would cause dangerous spurt conditions
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 prevents excessive boiling, reduces the risk of injury, and ensures safe operation by controlling power delivery and monitoring liquid levels, thereby enhancing user safety and preventing overheating or overflow.
Implementation Method 1
electric kettles include a temperature sensor to measure the temperature of the liquid being heated
Implementation Method 2
partial power is applied to the heater
Implementation Method 3
A conduit, typically in the form of a copper tube, is provided from a location above the surface of the water in a filled kettle to a location adjacent a thermostat which is adapted to cut power to the element when it senses the high temperature due to the steam
Data Source
AI summary
The present invention provides apparatuses and methods for boiling a liquid such as water. The liquid is heated at full power when the measured temperature of the liquid is below a first predetermined threshold. When the temperature is above the first predetermined threshold and below a second predetermined threshold, partial power, which may be based on the duty cycle, is applied to the heater. When the measured temperature of the liquid reaches the second predetermined threshold, power is removed from the heater after a predetermined time. When the increase of the measured temperature is less than a predetermined temperature change during a predetermined time duration, it is determined that the liquid is boiling and power is removed to the heater. If the level is too high or too low, an alarm may be activated and/or power removed from the heater.