Heat Sink Element With Dynamic Thermal Resistance
Solution Overview
Problem
Conventional heat sink devices face risks of overheating and electrical arc propagation when the cold source is not adapted to varying temperature conditions, particularly when made of combustible materials or sensitive to temperature rises.
Innovation Solution
A heat sink device with a heat-transmitting element that limits heat transmission beyond a predetermined threshold, using mechanisms such as state change to increase thermal resistance, separation by a gas layer, or loss of contact to prevent overheating and electrical phenomena, ensuring safe operation of equipment like fuel pumps and electronic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the heat-transmitting element continuously transmits heat from the equipment to the cold part, then the heat evacuation efficiency is improved, but the cold part made of combustible material or temperature-sensitive material is at risk of overheating and degradation
Solution Approach 1:
The heat-transmitting element changes its thermal conductivity parameter in response to temperature conditions. When the cold part temperature approaches a threshold, the element's thermal conductivity decreases automatically, reducing heat transmission to prevent overheating while maintaining efficient heat evacuation during normal operation
Solution Approach 2:
The heat-transmitting element autonomously regulates heat flow based on temperature feedback without external control. The element itself responds to thermal conditions by adjusting its heat transmission properties, eliminating the need for external control systems while preventing cold part overheating
2Reliability
If the equipment and cold part are separated by a gas layer to prevent electrical arc propagation, then electrical safety is improved, but heat transmission efficiency deteriorates
Solution Approach 1:
The separation distance between equipment and cold part is made dynamic rather than fixed. The gap adjusts based on operational conditions - maintaining contact or minimal separation for efficient heat transmission during normal operation, and increasing separation when electrical arc risk is detected, thus balancing heat transfer efficiency with electrical safety
Solution Approach 2:
A controllable intermediary mechanism (such as an adjustable support structure or positioning system) is introduced between the equipment and cold part. This intermediary allows precise control of the separation distance, enabling the system to optimize both heat transmission (when closely spaced) and electrical safety (when separated by gas layer)
Solution Approach 3:
The system utilizes phase transition of the gas layer (between dense and dispersed states) to control both heat transfer and electrical insulation properties. Under normal conditions, the gas is in a dense state allowing efficient thermal conduction; under electrical stress conditions, it transitions to a dispersed state providing electrical insulation while maintaining acceptable thermal transfer
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
Effectively prevents overheating of combustible materials and prevents electrical arc propagation, ensuring the safety and efficient heat management of heat sink devices under extreme thermal conditions.
Implementation Method 1
the element comprises at least one component of which a change of state (for example a transition from the liquid state to the gaseous state) under said thermal conditions causes the thermal resistance to increase
Implementation Method 2
The equipment and the cold part can also be separated essentially by a gas layer, at least under said thermal conditions, in order also to avoid under these conditions the transmission of electrical phenomena
Implementation Method 3
the element can then comprise at least one heat pipe passing through said blade. In this context, advantage is taken of the limitation of the thermal power that the heat pipes can transmit, past a certain threshold
Implementation Method 4
the element is configured to lose contact with the equipment or the cold part under said thermal conditions. It is in this case the breaking of contact between the various parts which causes the interruption of the thermal path
Data Source
Figure 1A~3C
Figure 4A~5B
AI summary
A device comprises equipment (501) with a heat source having a maximum thermal operation condition, a cold part (502) relative to the equipment and an element (503) capable of transmitting the heat from the equipment to the cold part. The element (503) is capable of causing the transmitted heat to be limited for thermal conditions above a specified threshold below said maximum condition.