Domestic Appliance Cover Plate Cooling for High-Power Electronics
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Solution Overview
Problem
Existing domestic appliances face challenges in effectively cooling high-power electronics units, such as power electronics, due to inadequate heat dissipation methods, leading to inefficient thermal management and potential overheating.
Innovation Solution
A domestic appliance design featuring a heat sink with a large surface area and cooling fins in thermal contact with a metal cover plate, enhanced by a thermally conductive paste for improved heat transfer, and an air flow unit that guides airflow along both sides of the cover plate to enhance heat dissipation, utilizing a fan and air ducts for efficient cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional cooling method is used for high-power electronics units, then the device structure remains simple, but the cooling efficiency is insufficient leading to overheating
Solution Approach 1:
The heat sink is integrated with the cover plate into a unified cooling structure. The heat sink is in thermal contact with the cover plate, merging the cooling function with the structural cover component, thereby improving cooling efficiency without proportionally increasing device complexity
Solution Approach 2:
The cooling solution extends from a single-sided heat sink to a dual-sided configuration where the cover plate itself becomes a heat dissipation surface. Airflow is directed along both sides of the cover plate, utilizing three-dimensional space for heat dissipation rather than relying solely on one dimension
2Temperature
If the heat sink surface area is increased to improve heat dissipation, then the cooling performance improves, but the device volume and material usage increase
Solution Approach 1:
The cover plate serves multiple functions simultaneously: it acts as the structural cover for the electronics unit, a heat sink surface for heat dissipation, and a flow guide for airflow direction. This multi-functionality increases heat dissipation capability without proportionally increasing device volume
Solution Approach 2:
The cooling structure is segmented into distinct airflow paths along the first and second sides of the cover plate, with separate inlet and outlet regions. This segmentation allows efficient heat dissipation across the entire cover plate surface area without requiring a single large bulky heat sink
3Temperature
If thermal contact between heat sink and cover plate is improved using heat-conducting paste, then the heat transfer efficiency increases, but the manufacturing complexity increases
Solution Approach 1:
A heat-conducting paste is introduced as an intermediary substance between the heat sink and cover plate contact surfaces. This paste fills microscopic gaps and unevenness in the surfaces, significantly improving thermal contact and heat transfer efficiency
Solution Approach 2:
The thermal conductivity parameter of the interface between heat sink and cover plate is enhanced by introducing the heat-conducting paste. This changes the thermal properties of the contact interface, improving heat transfer efficiency while the application process remains a standard manufacturing step
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 configuration significantly improves cooling efficiency by creating a large heat reservoir and directing airflow to effectively dissipate heat from the heat sink, reducing material and production costs while maintaining structural integrity and cooling performance.
Implementation Method 1
the heat sink being in thermal contact with the domestic appliance cover plate
Implementation Method 2
a thinly applied, fluid heat-conducting medium, in particular a heat-conducting paste, is introduced between the heat sink and the household appliance cover plate, which compensates for unevenness in the contact surfaces
Implementation Method 3
an air flow unit which is provided to guide an air flow to the heat sink during at least one operating mode
Data Source
Figure 1
AI summary
The domestic appliance has a radiator box (10) that is arranged for cooling an electronic unit (12). An appliance cover plate (14) is thermally contacted with radiator box. An air guide unit (22) is arranged to guide the air produced from a fan unit (16) to underside (38) of appliance cover plate.