Draft Shield Thermoelectric Cooling for Balance Convection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Precision weight measurements are compromised by unstable air stratification and temperature differences within weighing chambers, particularly in top loader balances, due to heat intake from electronics causing convection flows, which affect measurement accuracy at sub-milligram resolutions.
Innovation Solution
A draft shield with a heat transmission member and a heat dissipator, utilizing a thermoelectric module to actively cool the heat transmission member and dissipate heat to ambient air, maintaining a stable temperature stratification and equalizing internal temperatures with ambient conditions, thereby reducing convection flows and enhancing measurement precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a top loader balance is used with electronics below the weighing pan, then the balance structure is compact and load cell integration is simplified, but heat from electronics causes unstable air stratification and convection flows that reduce measurement precision
Solution Approach 1:
A draft shield is introduced as an intermediary component between the weighing pan and the ambient environment. The draft shield includes a weighing chamber that encloses the weighing pan and is thermally isolated from the electronics below, preventing direct heat transfer to the weighing environment while maintaining structural integration.
Solution Approach 2:
The draft shield is divided into a housing and a separate weighing chamber. The weighing chamber can be detached from the housing, allowing independent thermal management. This segmentation enables the weighing chamber to be thermally isolated from heat-generating electronics while maintaining a compact overall structure.
2Measurement precision
If thermal insulation is increased to stabilize air stratification, then measurement precision improves, but heat dissipation from electronics becomes more difficult
Solution Approach 1:
The draft shield housing acts as a thermal intermediary, providing insulation between the weighing chamber and the ambient environment while including dedicated heat dissipation pathways. The housing can be made of thermally insulating materials to protect the weighing chamber while incorporating features like ventilation channels or thermally conductive paths to dissipate heat from electronics externally.
3Ease of operation
If a modular draft shield design is used, then ease of handling and reliability improve, but device complexity increases
Solution Approach 1:
The draft shield is segmented into a housing and a weighing chamber that can be easily detached from each other. The weighing chamber includes a weighing pan and is designed to be removable for cleaning, maintenance, or replacement. This modular design simplifies handling and maintenance while the standardized interface minimizes the increase in overall device complexity.
Solution Approach 2:
The draft shield is designed as a universal component that can be used with different balance models. The housing and weighing chamber use standardized connection interfaces, allowing the same draft shield design to be applied across multiple balance types, reducing long-term complexity despite the modular 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 solution achieves stable air stratification and even temperature distribution within the weighing chamber, minimizing temperature influences during measurements and allowing for precise weight determination without the need for individual heat management systems on each balance, thus improving measurement accuracy and simplifying handling and reliability.
Implementation Method 1
a means for driving a heat flux from a member having a relatively lower temperature to a member having a relatively higher temperature in functional relationship with the heat transmission member and the heat dissipator
Implementation Method 2
The heat transmission member comprises at least a first plate-shaped section extending adjacent to and along the bottom side of the housing
Implementation Method 3
Heat intake from the balance electronics may induce convection flows inside the draft shield, or the weighing chamber provided inside the draft shield, respectively
Implementation Method 4
a heat dissipator arranged outside the housing
Data Source
AI summary
A draft shield for a balance includes a housing having a top side, a bottom side, and a back side. A heat transmission member of the draft shield includes at least a first plate-shaped section extending along and adjacent to the bottom side of the housing. A heat dissipator of the draft shield is arranged outside the housing. The draft shield further includes a means for driving a heat flux from a member having a relatively lower temperature to a member having a relatively higher temperature in functional relationship with the heat transmission member and the heat dissipator, such as a thermoelectric module, and in particular, such as a Peltier module.