RIGID’s Free-Piston Stirling Cryocooler is a type of refrigeration system that uses a Stirling cycle to cool objects to extremely low temperatures. It operates based on the principles of thermodynamics and involves the compression and expansion of a gas, typically helium, within a closed system.
The basic components of a free-piston Stirling cryocooler include a compressor, an expander, a regenerator, and a heat exchanger. The compressor compresses the gas, causing it to heat up and transfer heat to the heat exchanger. The gas then flows through the regenerator, which absorbs heat from the object being cooled. Next, the gas expands in the expander, which cools the gas and transfers heat to the heat exchanger. Finally, the gas flows back through the regenerator and the cycle repeats.
The free-piston aspect of the system refers to the fact that the compressor and expander are not mechanically connected to an external power source, but rather are driven by the pressure differences within the gas itself. This allows for more efficient and reliable operation compared to traditional cryocoolers.
Applications of free-piston Stirling cryocoolers include cooling Analyzers, Superconducting Materials, Infrared Sensors, Laboratory Equipment, Automatic devices of petrochemical and oil, and other high-precision scientific instruments. They are also used in food and cold chains, where their high reliability and long lifespan make them an ideal choice for cooling electronic components and scientific payloads.
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How to Set Up a Liquid Nitrogen Generator with FPSC Stirling Cryocooler?
Liquid nitrogen is commonly produced on a large scale by compressing, cooling, and expanding air to remove heat until it liquefies. This process necessitates a complex, large distillation column to separate nitrogen from other gases in the air, making it difficult to scale down.
To overcome this limitation, nitrogen separation devices can be used to extract nitrogen from the air at room temperature, followed by standard compression and expansion to achieve liquefaction. This approach is likely used in the Nitrogen generator, which still requires high-pressure compressors, heat exchangers, insulation, and custom parts.
Alternatively, RIGID company’s self-contained FPSC-Cryocooler can be utilized to produce small-scale liquid nitrogen. This Stirling device pumps heat across a high-temperature differential and is designed for spot-cooling in electronics. The central element in all equipment of RIGID Stirling cooler is the Stirling Cycle Cryogenerator.
The Stirling Cycle is remarkable because it is a closed cycle in which the Cryogenerator’s internal working gas (He) never comes into contact with the fluid to be cooled; they connect only by the flow of heat through the heat-exchanger wall. This concept eliminates contamination of the customer’s process as well as of the Stirling Cycle working gas, resulting in long continuous operating periods and longevity.
RIGID Cryocoolers require minimal maintenance and can liquefy gases at atmospheric pressure without the need for compressors, though they may be useful for removing water from the air and separating nitrogen from other gases.
Free-piston Stirling cycle cryocoolers are a type of cryocooler that utilizes an internal piston driven by an electrical coil or linear motor. This piston expands a working fluid, such as helium, while a separate displacing piston moves the fluid to the tip.
The piston then reverses direction, compressing the fluid as the displacing piston forces the fluid toward a heat-rejection area of the device. This process is repeated to constantly expand the working fluid at the tip and compress it at the heat-rejection area, which pumps heat from the tip to the rejection area.
The rejection area is cooled with atmospheric air or other fluids that exchange heat with the environment. Although Stirling cryocoolers are not commonly used, they are suitable for fast and ultra-low temperature freezing devices and superconducting components.
Stirling Cryocooler Setup for Spectroscopy Lab.
Stirling cryocoolers are commonly used in spectroscopy laboratories to provide low-temperature cooling for the detectors used in various spectrometers. These coolers operate using a Stirling cycle, which is a thermodynamic cycle in which a gas is compressed and expanded to transfer heat from one location to another.
The basic components of a Stirling cryocooler include a compressor, a hot end, a cold end, and a regenerator. The compressor compresses the gas, causing it to heat up and flow into the hot end. At the hot end, the gas releases its heat to the environment, causing it to cool and flow into the cold end.
At the cold end, the gas expands and cools further, causing it to absorb heat from the detector. The regenerator is a porous material that helps transfer heat between the hot and cold ends. In a spectroscopy laboratory, a Stirling cryocooler can be used to cool the detector of a spectrometer to very low temperatures, typically below 100 K (-173℃). This is necessary because many detectors used in spectroscopy require low temperatures to operate effectively, and the Stirling cryocooler provides a compact and reliable way to achieve this.
Overall, the Stirling Cryocooler is a powerful tool for the spectroscopy laboratory, providing efficient and effective cooling for a wide range of applications.
Stirling Cryocooler Used for Automated Lab Device for High-Precision Analysis.
RIGID’s Stirling engine cryocooler can be used as a cooling source for a versatile automated laboratory instrument for high-precision analysis. This type of laboratory instrument typically requires precise temperature control for various applications such as spectroscopy, chromatography, and other analytical techniques.
In a versatile automated laboratory instrument for high-precision analysis, the RIGID Stirling cryocooler can be used to provide a stable and precise cooling source for various components, including detectors, sample chambers, and other temperature-sensitive components.
The cryocooler can be controlled and adjusted to maintain the desired temperature range, ensuring that analytical results are accurate and reproducible. For example, in a spectroscopy application, the Stirling cryocooler can cool the detector to a low temperature, which can improve the sensitivity and accuracy of the measurement. Similarly, in chromatography, the Stirling cryocooler can be used to cool the column and improve the resolution and separation of analytes.
Overall, the RIGID Stirling engine cryocooler is a versatile and efficient cooling source that can be used in a wide range of analytical applications, providing precise temperature control and improving the accuracy and sensitivity of the analysis.
Stirling Cryocooler for Petrochemical and Oil Refining Device Cooling.
The RS100 cryocooler setup shown in the below picture has already registered more than 600 operating hours. It has been commissioned by coupling the Stirling cryocooler developed by RIGID technology to Automated Lab Device for High-Precision Analysis. Using this setup photoluminescence spectra of solid samples can be performed in the temperature range of 77K to 300K.
The main activity is the development and production of automatic devices for quality control of petrochemical and oil refining products with the possibility of their integration into a single automated enterprise management system.
RIGID is the miniature compressor innovation leader in China. We keep looking for novel solutions in compact & portable refrigeration technology.
Our product lines include Mini Compressors, Air Cooling, Liquid Cooling, and Direct Refrigerant micro-cooling systems. Products are widely used in commercial, industrial, and personal refrigeration applications, and tiny liquid cycle refrigeration devices. The qualification of most products has met the technical and quality standards of Germany, the U.S., the UK, and Asian countries.
With nearly 12 years of persistent endeavors of our people, RIGID has established a whole set of management systems and has passed ISO9001:2008 International Quality Management System, and has gained CCC, CE, RoHS, and UL certificates.
Today Rigid has helped many companies and startups upgrade their devices with the latest micro cooling technology.