Sous Vide Cooker Thermal Segmentation for Portable Heat Control
Solution Overview
Problem
Sous vide immersion cookers pose a risk of user contact with heated components due to their design, particularly in consumer appliances where space constraints make heat control inadequate.
Innovation Solution
A sous vide cooker design featuring a housing with a bulkhead, heat sink, and skirt configuration that includes a TRIAC in conductive thermal communication with the heat sink, an impeller, and a motor-driven impeller system, with thermal isolation to manage heat dissipation and user safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sous vide cooker is made smaller for portability, then ease of operation is improved, but heat control and user safety deteriorate due to increased risk of contact with heated components
Solution Approach 1:
The internal components are segmented into distinct thermal zones: the heating element is isolated in its own chamber, the TRIAC is thermally coupled to a heat sink, and the pump is separated from direct heat exposure. This segmentation allows the device to maintain compact dimensions while creating thermal barriers that protect users from contact with heated components.
Solution Approach 2:
A heat sink is introduced as a thermal intermediary between the TRIAC and the external environment. The heat sink absorbs and dissipates heat generated by the TRIAC, preventing this heat from transferring to the housing surfaces that users might contact. This intermediary component enables safe thermal management in a compact form factor.
2Productivity
If the heating element is placed in direct contact with the housing for efficient heat transfer, then heating efficiency is improved, but user safety deteriorates due to heat transfer to contactable surfaces
Solution Approach 1:
Different parts of the housing have different thermal properties: the section containing the heating element has direct thermal coupling for efficient heating, while other sections are thermally isolated or equipped with heat sinks. This local differentiation allows efficient heat transfer where needed while maintaining safe surface temperatures in user-contact areas.
Solution Approach 2:
The heat that would otherwise be a harmful factor (heating the housing surfaces) is converted into a beneficial function by directing it through the liquid medium to cook food. The heating element transfers heat efficiently to the liquid rather than to the housing, and the heat sink captures any excess heat from the TRIAC, converting potential harmful heat into useful thermal energy for the cooking process.
3Device complexity
If the TRIAC is mounted directly to the housing for structural simplicity, then device complexity is reduced, but heat control deteriorates due to inadequate heat dissipation
Solution Approach 1:
The heat sink is merged with the housing structure, combining thermal management functionality with the mechanical housing. This integration provides adequate heat dissipation for the TRIAC while maintaining a compact design. The heat sink becomes part of the housing's thermal architecture rather than a separate附加 component, achieving heat control without proportionally increasing device complexity.
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
Enhances heat control and user safety by effectively dissipating heat away from contactable surfaces, maintaining operational efficiency within a sealed, water-resistant enclosure.
Implementation Method 1
A TRIAC is physically attached in conductive thermal communication to the heat sink in the second cavity
Implementation Method 2
A heating element located within the third cavity
Implementation Method 3
An impeller is located in the third cavity. A drive shaft extends through at least the heat sink and into the third cavity and is operatively connected to the impeller
Data Source
AI summary
A sous vide cooker having a housing, a bulkhead attached to the housing to form a first cavity, a heat sink attached to the bulkhead to form a second cavity, and a skirt attached to the bulkhead to form a third cavity below the heat sink. A TRIAC is physically attached in conductive thermal communication to the heat sink in the second cavity. The cooker also has a motor, an impeller located in the third cavity, a drive shaft extending through at least the heat sink and into the third cavity and operatively connecting the motor to the impeller, and a heating element located within the third cavity.