Temperature sensor and cooking device
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Solution Overview
Problem
Temperature sensors used in cooking devices face challenges in maintaining a long-lasting physical object detection function due to friction caused by the reciprocation of magnetic bodies, which affects their durability and accuracy.
Innovation Solution
A temperature sensor design featuring a magnetic shield and a protective pipe with different hardness levels, where the magnetic shield is harder than the protective pipe, allowing the magnetic shield to preferentially abrade and reduce friction forces during movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the magnetic shield reciprocates between the permanent magnet and the reed switch to detect cookware presence, then the physical object detection function is achieved, but friction force increases due to sliding with peripheral members
Solution Approach 1:
The patent replaces the mechanical sliding detection system with a magnetic field-based detection system. The magnetic shield reciprocates between the permanent magnet and reed switch, using magnetic field interaction rather than mechanical contact to detect cookware presence. This substitution eliminates friction between the magnetic shield and peripheral members while maintaining reliable detection functionality.
Solution Approach 2:
The magnetic shield acts as an intermediary element that reciprocates between the permanent magnet and reed switch. It mediates the detection process by moving in response to heat collecting body movement and interacting with the magnetic field, enabling indirect detection without direct mechanical contact between conflicting components.
2Measurement precision
If the magnetic body reciprocates to maintain contact with the cookware bottom surface, then temperature measurement is enabled, but wear increases reducing durability
Solution Approach 1:
The patent uses a magnetic field-based detection system instead of direct mechanical contact for detecting cookware presence. The magnetic shield reciprocates within the magnetic field between the permanent magnet and reed switch, eliminating mechanical wear while maintaining the ability to detect when the heat collecting body contacts the cookware bottom surface for temperature measurement.
Solution Approach 2:
The magnetic shield's reciprocation motion copies or mirrors the movement of the heat collecting body without direct mechanical contact. When the heat collecting body moves down to contact the cookware, the magnetic shield reciprocates accordingly within the magnetic field, providing a frictionless means of tracking position for detection purposes.
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 design effectively reduces friction forces between the magnetic shield and the protective pipe, enhancing the durability and accuracy of the temperature sensor's detection function by ensuring smooth reciprocation and minimizing wear.
Implementation Method 1
a magnetic shield (61) attached to the electrical wires (30) and configured to be capable of moving in an interior of the protective pipe (51)... a permanent magnet (69) disposed on an outside of the protective pipe (51) and configured to generate a magnetic field
Implementation Method 2
a thermistor element is provided in contact with or close to the heat collecting body, and measures the temperature of the cookware by receiving the heat transferred from the heat collecting body
Data Source
AI summary
A sensor detects presence and temperature of a measurement object. The sensor includes: a temperature sensor that detects the temperature of the measurement object; a sensor holder that holds the temperature sensor in a movable manner; and a detector that detects the presence of the measurement object in response to a movement of the temperature sensor. The detector includes a shield that moves in response to the movement of the temperature sensor, the sensor holder includes a pipe that holds the shield and controls a movement of the shield such that the shield moves in a predetermined direction in response to the movement of the temperature sensor, and the shield and the pipe are different in hardness.