Peltier Thermal Block Interface Without Thermal Grease
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Solution Overview
Problem
Thermal interface materials in thermal cyclers are prone to degradation and displacement due to uneven heat expansion coefficients between the Peltier element and the thermal block, leading to reduced heat transfer efficiency and potential electrical malfunctions.
Innovation Solution
Coating the surfaces of the thermal block and the Peltier element with a solid film lubricant to reduce friction forces and eliminate the need for thermal interface materials, allowing for improved thermal contact without compromising heat transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal interface materials are used between the Peltier element and the thermal block, then heat transfer efficiency is improved, but the materials are prone to degradation and displacement due to uneven heat expansion coefficients
Solution Approach 1:
The patent removes the thermal interface material layer entirely from the system. By direct contact between the Peltier element and thermal block surfaces, the system eliminates the intermediate material that causes degradation and displacement, while maintaining effective heat transfer through precise surface matching and mechanical compression.
Solution Approach 2:
The patent employs a composite structure where the Peltier element, thermal block, and compression mechanism work together as an integrated system. The diverse materials (semiconductor elements, metal blocks, compression springs) are combined to achieve both thermal efficiency and mechanical stability without requiring additional interface materials.
2Reliability
If high mechanical force is applied to couple the Peltier element to the thermal block, then heat transfer efficiency is improved, but friction increases causing wear and potential electrical malfunctions
Solution Approach 1:
The patent incorporates compression springs that apply predetermined mechanical force to couple the Peltier element to the thermal block before operation begins. This pre-applied compression ensures stable thermal contact while the elastic nature of the springs provides cushioning that reduces impact forces and friction during thermal cycling operations.
Solution Approach 2:
The system uses dynamically adjustable compression forces through spring mechanisms that can accommodate thermal expansion and contraction during cycling. The mechanical coupling allows for controlled movement and adjustment, reducing static friction and wear while maintaining adequate contact pressure for heat transfer.
3Adaptability or versatility
If the dimensions of the Peltier element and thermal block are very unequal, then adaptability is improved, but divers expansion causes increased friction and material damage
Solution Approach 1:
The patent applies different properties to different parts of the thermal interface system. The contact surfaces are specifically engineered with appropriate roughness, hardness, and thermal conductivity characteristics. The compression force is distributed non-uniformly to accommodate size differences between the Peltier element and thermal block while ensuring adequate contact at the interface.
Solution Approach 2:
The system allows parameters such as compression force, contact pressure, and interface geometry to change dynamically during operation. The compression springs adjust the mechanical parameters to accommodate thermal expansion differences, while the interface design maintains stable contact despite dimensional mismatches between components.
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 use of solid film lubricants significantly reduces friction and the risk of material damage, ensuring stable and efficient heat transfer over numerous thermal cycles, with minimal impact on heat transmission resistance.
Implementation Method 1
Coating the surfaces of the thermal block and the Peltier element with a solid film lubricant to reduce friction forces
Implementation Method 2
A Peltier element is a solid-state active heat pump which transfers heat from one side of the device to the other side against the temperature gradient under consumption of electrical energy
Implementation Method 3
In order to allow for an efficient heat transition the Peltier elements are coupled to the thermal block on one major surface
Implementation Method 4
In addition thermal cyclers comprise a heat sink for absorbing and dissipating heat from another object using thermal contact
Implementation Method 5
there is an increased risk that the thermal interface materials may be harmed and degraded or displaced, e.g., by friction while thermal profiles are applied particularly when the dimensions of the Peltier element and the thermal block are very unequal resulting in a divers expansion
Data Source
AI summary
The present invention relates to a device for heating and cooling an object in a controlled manner permitting a good thermal contact between the thermal block, the element for heating and cooling and the heat sink without the need for using a thermal interface material, an instrument comprising such a device and a method for conducting a thermal profile using the device.