Liquid Heating Device With Fewer Safety Devices Than Ceramic Heaters
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Solution Overview
Problem
Existing liquid heating devices with multiple ceramic heaters face challenges in size reduction and effective detection of abnormal temperature increases due to insufficient safety devices, which can lead to overheating if not adequately addressed.
Innovation Solution
A liquid heating device design with fewer safety devices than heaters, positioned on the outer side of the container or buried within, strategically placed to detect abnormal temperature increases by being closer to adjacent heaters, utilizing a heat-transfer medium for enhanced detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the number of safety devices is reduced to fewer than the number of ceramic heaters, then the size of the liquid heating device is reduced, but the ability to detect abnormal temperature increases of all heaters may be insufficient
Solution Approach 1:
Multiple ceramic heaters are grouped into pairs, and one safety device serves both heaters in a pair. This merging approach reduces the total number of safety devices needed while ensuring comprehensive coverage, as each safety device monitors two adjacent heaters positioned within its detection range
Solution Approach 2:
The safety devices are strategically positioned at specific locations to cover specific pairs of heaters. Each safety device has a localized detection zone optimized for its paired heaters, creating a distributed monitoring network that provides reliable detection with fewer devices
2Measurement precision
If safety devices are positioned closer to ceramic heaters, then abnormal temperature increase detection is improved, but the device complexity increases
Solution Approach 1:
The arrangement creates an asymmetric distribution where safety devices are positioned offset from the center to optimally cover pairs of heaters. This asymmetric positioning allows each safety device to effectively monitor its designated pair while maintaining a relatively simple overall structure
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 design achieves size reduction while ensuring reliable interruption of heater energization during abnormalities, effectively detecting and preventing overheating through closer proximity of safety devices to ceramic heaters.
Implementation Method 1
a heat-transfer medium having a thermal conductivity higher than a thermal conductivity of the container may be further provided between the safety device and the container
Implementation Method 2
a plurality of ceramic heaters which extend in a front-rear direction and whose front-end portions are located in the internal space, the ceramic heaters having heat generation portions at the front-end portions
Data Source
AI summary
A liquid heating device 200 including: a container 100 having an internal space 100i; a plurality of ceramic heaters 171-172 extend in a front-rear direction L and whose front-end portions are located in the internal space; and a safety device 150 configured to interrupt energization to the ceramic heaters when a temperature of the container has exceeded a set value, wherein the safety device whose number is smaller than a number of the ceramic heaters is provided on an outer side of the container or buried in the container, and in a cross-section crossing the front-rear direction, one safety device is provided inside an area R1 between two lines S1,S2 which pass centers of gravity G1, G2 of at least a pair of two adjacent ones of the ceramic heaters and which are perpendicular to a segment M1 connecting the centers of gravity.