Induction Heater Temperature Detector Grommet Design
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Solution Overview
Problem
Induction heater temperature detectors often deform or degrade due to permanent or elastic deformation and spillage, leading to reduced lifespan and frequent maintenance or replacement.
Innovation Solution
A temperature detector design featuring an RTD with a grommet and cylindrical housing, where the grommet's arcuate portion biases upwardly to maintain contact with the pan and withstand spillage, utilizing an elastomeric material and spring mechanism for durable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature detector is used in an induction heater, then temperature measurement accuracy is improved, but the detector deforms permanently or elastically with use which decreases its lifespan
Solution Approach 1:
The temperature detector is divided into separate functional components: a sensor housing containing the RTD, a grommet with arcuate portion for contact, and a cylindrical housing for structural support. This segmentation allows each component to be optimized independently - the grommet for durability and contact maintenance, the RTD housing for protection, and the cylindrical housing for overall structural integrity.
Solution Approach 2:
The grommet's arcuate portion is designed with elastic properties to absorb and cushion the mechanical stresses and thermal expansion forces that occur during operation. This beforehand cushioning protects the RTD from deformation while maintaining continuous contact with the pan, thereby extending the detector's lifespan without compromising measurement accuracy.
2Measurement precision
If a temperature detector maintains continuous contact with the pan for accurate detection, then temperature measurement accuracy is improved, but spillage from pan contents degrades the detector surface requiring frequent maintenance
Solution Approach 1:
The grommet acts as an intermediary between the pan and the RTD sensor. It maintains the necessary contact for accurate temperature detection while its elastic and protective properties shield the RTD from direct exposure to spillage. This intermediary function allows continuous contact for measurement accuracy while reducing maintenance requirements for the sensitive electronic components.
Solution Approach 2:
The grommet is constructed as a flexible elastic component that can deform to accommodate thermal expansion and mechanical stresses. This flexibility allows it to maintain reliable contact with the pan across varying operating conditions while its material properties resist degradation from exposure to food contents, reducing maintenance frequency.
3Ease of manufacture
If the temperature detector structure is simplified for ease of manufacture, then manufacturing cost is reduced, but the detector cannot withstand spillage for long operation between maintenance
Solution Approach 1:
The detector is segmented into modular components (grommet, RTD housing, cylindrical housing) that can be manufactured separately using standard processes and then assembled. This segmentation maintains manufacturing simplicity while allowing each component to be optimized for its specific function, including spillage resistance for the grommet and structural protection for the housings.
Solution Approach 2:
The grommet is made from composite or specially formulated elastic materials that combine flexibility for maintaining contact with resistance to chemical degradation from food spillage. This material selection achieves both durability against spillage and ease of manufacture through available material options and standard manufacturing processes.
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 ensures accurate temperature detection and efficient operation with prolonged maintenance intervals by maintaining good contact with the pan and resisting spillage, enhancing the lifespan of the temperature detector.
Implementation Method 1
the grommet includes an arcuate portion that is biased in a direction upwardly from the resting surface
Implementation Method 2
an RTD and associated wiring, a first housing that receives the RTD
Data Source
Figure 1~1a
Figure 2
Figure 3~4
AI summary
A system to warm contents in a tray is provided. The system includes an induction heating system a resting surface, and a temperature detector disposed upon the resting surface such that a pan that is disposed upon the resting surface contacts the temperature detector. The temperature detector includes an RTD and associated wiring, a first housing that receives the RTD, and a grommet disposed around the first housing. The temperature detector additionally includes a cylindrical second housing that supports and receives a portion of the first housing therewith and through a first end of the second housing. The grommet includes an arcuate portion that is biased in a direction upwardly from the resting surface, the arcuate portion comprises a central opening through which the first housing extends, wherein the central opening defines an inner circular surface that is disposed between the first and second housings.