Temperature sensor and cooking device
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Solution Overview
Problem
Temperature sensors with physical object detection functions face challenges in maintaining the detection function over a long period due to friction caused by the reciprocation of magnetic bodies, which affects their reliability and durability.
Innovation Solution
A temperature sensor design featuring a magnetic shield and a protective pipe with a hardness difference, where the magnetic shield moves within the protective pipe, reducing friction by allowing the softer member to abrade preferentially, thus minimizing friction force during reciprocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic body reciprocates between the permanent magnet and reed switch to detect cookware presence, then the physical object detection function is achieved, but friction force increases due to sliding contact
Solution Approach 1:
The patent replaces the mechanical sliding contact system with a magnetic field-based detection system. Instead of physically sliding a magnetic body between the permanent magnet and reed switch, the invention uses the magnetic body's movement to modulate the magnetic field, which is detected by the reed switch. This substitution eliminates direct mechanical friction while maintaining the detection function.
Solution Approach 2:
The patent introduces a magnetic shield as an intermediary element that mediates between the permanent magnet and the reed switch. The magnetic shield's movement changes the magnetic field distribution, allowing the reed switch to detect the cookware's presence or absence without requiring direct mechanical contact between the magnetic body and the switch components, thereby reducing friction.
2Reliability
If a magnetic body reciprocates with a magnetic sensor to detect cookware presence, then the physical object detection function is achieved, but friction force increases due to sliding contact
Solution Approach 1:
The patent replaces the mechanical sliding contact system with a magnetic field-based detection system. Instead of physically sliding a magnetic body between the permanent magnet and reed switch, the invention uses the magnetic body's movement to modulate the magnetic field, which is detected by the reed switch. This substitution eliminates direct mechanical friction while maintaining the detection function.
Solution Approach 2:
The patent introduces a magnetic shield as an intermediary element that mediates between the permanent magnet and the reed switch. The magnetic shield's movement changes the magnetic field distribution, allowing the reed switch to detect the cookware's presence or absence without requiring direct mechanical contact between the magnetic body and the switch components, thereby reducing friction.
3Reliability
If a magnetic shield reciprocates freely to detect cookware presence, then the detection function is achieved, but friction and wear increase over time
Solution Approach 1:
The patent changes the physical parameters of the magnetic shield by creating a hardness difference between the magnetic shield and the protective pipe. The magnetic shield is made harder than the protective pipe, which alters the wear characteristics of the sliding interface. This parameter change ensures that the magnetic shield maintains its dimensional stability and magnetic properties over time, while the softer protective pipe absorbs wear, thereby extending the service life of the detection system.
Solution Approach 2:
The patent applies different material properties to different parts of the sliding mechanism. The magnetic shield is made with high hardness to maintain its magnetic shielding function, while the protective pipe is made with lower hardness to provide a self-lubricating, wear-absorbing surface. This local differentiation of material quality optimizes both the detection function and the service life of the system.
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 effectively reduces friction force between the magnetic shield and the protective pipe, enhancing the longevity and reliability of the temperature sensor's physical object detection function.
Implementation Method 1
a detection unit configured to detect the presence of the measurement object in response to the movement of the sensor unit. The detection unit includes a first member (magnetic shield) configured to move in response to the movement of the sensor unit
Implementation Method 2
Elastic force is applied to the heat collecting body upward by a coil spring
Implementation Method 3
measures the temperature of the cookware by receiving the heat transferred from the heat collecting body
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A temperature sensor 1 in the present invention includes: a heat-sensitive element (sensor unit) 10 configured to detect the temperature of a measurement object; a sensor holding body (holding unit) 40 configured to hold the heat-sensitive element 10 in a movable manner; and a detection unit 60 configured to detect the presence of the measurement object in response to the movement of the heat-sensitive element 10. The detection unit 60 includes a magnetic shield 61 (first member) configured to move in response to the movement of the heat-sensitive element 10, and the holding unit 40 includes a protective pipe 51 (second member) configured to restrict the movement of the magnetic shield 61 and hold the magnetic shield 61 such that the magnetic shield 61 moves in a predetermined direction in response to the movement of the heat-sensitive element 10. The magnetic shield 61 and the protective pipe 51 are different in hardness.