1. What is centrifuge?
Centrifuge is a machine that uses centrifugal force to accelerate the separation of different materials that need to be separated.
Refrigerated centrifuges are divided into low-speed refrigerated centrifuges and high-speed refrigerated centrifuges, as well as over-speed analysis and preparation dual-purpose refrigerated centrifuges.
2. More introduction of centrifuge
Centrifuges, also known as precipitators, include separation centrifuges used to quickly separate suspended substances in liquids, large preparation centrifuges used to concentrate and purify particles, and low-speed analysis centrifuges used for experimental analysis. Although the types of centrifuges are different, their functions can be divided into separation, concentration, purification and analysis.
The development of centrifuges is reflected in the continuous improvement of structure and centrifugation methods. The improvement of the structure is first reflected in the increase of the speed. From the only a few dozen revolutions at the beginning to hundreds of thousands of revolutions today, the ultra-high speed centrifuge has experienced six generations. And the service life of the drive system has increased from 1 billion revolutions to 20 billion revolutions. Working hours have developed from a few hours to dozens of hours or days. The types of centrifugal rotors (rotating head) are constantly improved and increased. The degree of automation of control continues to improve. The body shape is developing in the direction of beauty, practicality and miniaturization. The greatest progress is the continuous enrichment and development of centrifugal methods, so that the scope of application of centrifuges continuous to expand.
The transmission mode of the centrifuge has experienced the process from hand-operated to electric, mechanical speed change, mechanical speed change driven by oil pressure and air pressure to today’s variable-frequency motor speed change.
At the end of the 19th century and the beginning of the 20th century, centrifuges stayed in the state of low-speed electric. By the 1920s, ultra-high-speed centrifuges appeared. DuPont company of the United States produced oil turbine centrifuges, and introduced air turbine centrifuges in 1933, which used compressed air to drive worm gears and then drive the centrifuges to rotate.
In 1955, Beckman company of the United States launched a pneumatic centrifuge up to 100,000rpm. After the 1970s, the application of high-speed motor, namely variable frequency motor, appeared. In the 1980s, the condensing motor was combined with microcomputer, which greatly improved the speed and performance of the centrifuge. After the 1980s, the centrifuge technology has become more and more mature, and it can better meet the needs of scientific research , production and medicine.
Centrifuge is a special instrument that uses centrifugal force to separate and precipitate mixed liquid (containing solids). The commonly used electric centrifuges in the laboratory include low-speed and high-speed centrifuges, low-speed and high-speed refrigerated centrifuges, as well as over-speed analysis and preparation dual-purpose refrigerated centrifuges.
3. Classification of Refrigerated Centrifuges
The rotating speed of low speed refrigerated centrifuge is generally less than 4000rpm, and maximum capacity is 2L-4L. It is the most commonly used in the laboratory for a large number of primary separation and extraction of biological macromolecules and sediments, etc. Its rotating head is mostly made of aluminum alloy, and there are two kinds of them: swing out type and fixed-angle type. The centrifugal pipe has a variety of material types, such as hard glass, polyethylene hard plastic and stainless steel pipe. The refrigerated centrifuge is generally equipped with drive motor, timer, regular (speed indication) and refrigeration system (temperature adjustable range is -20 to +40℃), and the rotating heads of different capacities and speed models can be replaced according to the needs of centrifugal substances.
Cence low speed refrigerated centrifuges as below:
large capacity floor standing low speed refrigerated centrifuges: CL8R, L720R-3, L800R-2, VORTEX 6K, DL-6M, CL5R, L535R-1(4x750ml),
benchtop low speed refrigerated centrifuge: CLT55R (4x750ml), L530R (4x250ml), CH12R (8x10ml), CH16R (4x4x15ml),
auto de-capping series of low speed refrigerated centrifuge: CTK64R(64 vacutainers), CTK80R(80 vacutainers), CTK120R(120 vacutainers), CTK150R(150 vacutainers)
The rotating speed of high speed refrigerated centrifuge can reach more than 20,000rpm. In addition to the performance and structure of low speed refrigerated centrifuge, the angular swivel used in high speed centrifuge is made of titanium alloy and aluminum alloy. The centrifuge tube is made of polyethylene hard plastic and usually with tube cover. Such centrifuges are mostly used to collect microorganisms, cell debris, cells, large organelles, sulfuric acid precipitates and immune precipitates.
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