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Key Secrets of Centrifuge Centrifugal Technology

2019/2/28 9:53:54      click :
  The design principle of the centrifuge is to accelerate the sedimentation velocity of the sample particles by using the centrifugal field force generated when the rotary head is rotated, and to separate the substances with different sedimentation coefficients or buoyancy density differences in the sample. In addition to the revolved per minute (r/min) and centrifugal (rotary) radius, the factors that determine the magnitude of the centrifugal force are also related to the effects of the forces (gravity, buoyancy, friction) of the particles in the rotational motion. The direction is perpendicular to the gravity, so the relative centrifugal force (R0) is used, that is, the centrifugal force acting on the rotating particles with respect to gravity, and the gravitational acceleration g (980 cm/s) is used as the magnitude, also called “g-Force”. ", the expression is: RCF = o) ~ / 980.
  The key to centrifugation is how to determine the centrifugal force, speed and centrifugation time settings based on the nature of the sample particles and media and the technical parameters of the rotor. The rate of sedimentation or separation of particles (collectively referred to as cells, organelles, and macromolecules) depends on the centrifugal force, particle size, shape, and density, as well as the density and viscosity of the sedimentation medium. Several types of commonly used centrifuges can be used depending on the application, speed, and functional configuration. : Medical centrifuges, laboratory centrifuges, cosmetic centrifuges, PRP centrifuges, high-speed centrifuges, low-speed centrifuges, high-speed refrigerated centrifuges, low-speed refrigerated centrifuges, etc., centrifuges of different speeds produce different centrifugal forces, with different the use of.
  Choosing the right centrifuge not only solves production problems, improves work efficiency, but also saves production costs and reduces operational risks. The main factors affecting the selection are the following:
  1. Rotating speed of the centrifuge: The general centrifuge should be above 3000 rpm. The higher the speed, the higher the separation factor of the centrifuge, the better the separation effect.
  2. The material of the centrifuge: different materials have different physical and chemical indexes such as wear resistance and corrosion resistance. The foreign centrifuges generally have a minimum material of 316L or duplex stainless steel, and the abrasive components must be made of ceramic composite materials.
  3. Differential control of centrifuge: Different differentials have different control precisions, and the difference between life and maintenance cost is very large. The higher the differential accuracy, the better the adaptability to materials. Therefore, it is better to use equipment with high differential accuracy. .
  4. Aspect ratio: The larger the aspect ratio of the centrifuge, the greater the processing capacity and the lower the moisture content.
  5. Control system: Whether it is automatic programming control, at present, domestic and foreign equipment manufacturers have basically realized the full automation control of the equipment.
  6. Installation power: affects the control of energy consumption, the high energy consumption ratio of domestic equipment, and the low energy consumption ratio of foreign countries.
  7. Processing and production process: Centrifuge is a separation equipment required for high-precision machining. The products produced by enterprises without finishing ability have high maintenance rate and limited processing capacity.
  An important indicator for measuring the separation performance of a centrifuge is the separation factor. It represents the ratio of the centrifugal force to the gravity of the separated material in the drum. The larger the separation factor, the faster the separation is usually and the better the separation effect. The separation factor of industrial centrifuges is generally 100 to 20000, the separation factor of super-speed tubular separators can be as high as 62000, and the separation factor of analytical ultra-speed separators is up to 610000. Another factor that determines the processing capacity of the centrifuge is the working area of ??the drum, which also has a large processing capacity.