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A sigma centrifuge is a machine that uses centrifugal force to separate liquid and solid particles or components of a mixture of liquid and liquid. The centrifuge is mainly used to separate the solid particles in the suspension from the liquid; or to separate the two liquids of different density and incompatible liquid in the emulsion (for example, separating the cream from the milk); it can also be used for elimination. Liquids in wet solids, such as wet clothes in washing machines; special ultra-speed tubular separators can also separate gas mixtures of different densities; use different density or granularity of solid particles to set different velocity in liquid, some sedimentation The centrifuge can also classify solid particles by density or particle size. Centrifuges are widely used in chemical, petroleum, food, pharmaceutical, mineral processing, coal, water treatment and shipbuilding sectors.
Sigma centrifugation principle
A sigma centrifuge has a cylinder that rotates at a high speed about its own axis, called a drum, which is usually driven by an electric motor. After the suspension (or emulsion) is added to the drum, it is rapidly driven to rotate at the same speed as the drum, and the components are separated under the action of centrifugal force and discharged separately. Generally, the higher the drum speed, the better the separation.
The principle of operation of sigma centrifugal separator is centrifugal filtration and centrifugal sedimentation. Centrifugal filtration is the centrifugal pressure generated by the suspension under the centrifugal force field, acting on the filter medium, so that the liquid passes through the filter medium to become the filtrate, and the solid particles are trapped on the surface of the filter medium to achieve liquid-solid separation; centrifugal sedimentation is utilized The principle of rapid sedimentation and stratification of the components with different densities (or emulsions) in the centrifugal force field enables liquid-solid (or liquid-liquid) separation.
The sigma desktop low-speed refrigerated centrifuge is driven by brushless electric variable frequency motor, microcomputer control, digital display, stainless steel centrifugal chamber, electronic door lock protection, and can change the parameters such as speed, centrifugal force, time and temperature during operation. The refrigeration system adopts imported compressor, fluorine-free environmentally friendly refrigerant, dual-loop control of refrigeration/heating, fast heating and cooling, and high precision. The machine is simple in operation, balanced in operation, stable in performance, safe and reliable. It is widely used in production and scientific research units such as radioimmunity, biochemistry, blood products, environmental protection, etc., to separate particles with different densities in solution. The installation of sigma centrifuge needs to meet the requirements, in order to carry out the normal operation in the subsequent operations, such as the installation of the power supply, as well as the balance of the installation, and the installation of the rotor. The following sigma engineers will give you a brief introduction about sigma high speed. The details of the installation of the centrifuge need to be noted.
Sigma centrifuge is installed correctly
a Power supply voltage: The voltage fluctuation should meet the national standard within 10%. Otherwise, some manufacturers' centrifuges cannot operate normally. If the voltage fluctuation is above this, it is recommended to use a voltage regulator to comply with this grid.
b The ground wire should be secure: the wiring of the power supply of the room should meet the requirements. China is a three-phase four-wire system. The three-phase is the three-phase in the industrial power. When the three-phase electricity is used, the neutral line is separated from the ground line. More importantly, whether it is three-phase industrial power or not, the general single-phase power is good, and the ground line should be reliable to avoid leakage. The ground wire cannot be connected to the hot air pipe or the water pipe.
c The ground should be flat and firm: for large centrifuges, the floor should be firm at the installation site to ensure the normal operation of the rotor of the centrifuge, and the ground should be flat and firm. d Find a good level: Find a small level with a correct level, open the lid of the centrifuge, find the level on the spindle, and find the level by adjusting the twisting of the adjusting bolt next to the four casters, and pay attention to one of the feet can not be lost.
Sigma centrifuge loading to find balance
In the design and manufacture of the sigma centrifuge, the imbalance of the machining error of the rotor has been remedy for the dynamic balance test, but all centrifuges have the unloading amount of the sample.
Manufacturers of sigma centrifuges strive to give larger values ​​in order to compete with other manufacturers on the maximum unbalance limit allowed by the centrifuge. At this larger value, the centrifuge can be operated, but the imbalance force generated at this time suddenly hits the bearing and the bracket at n times per minute, and the centrifuge is damaged. Therefore, users should try to find a good balance and centrifuge for those expensive centrifuges, which is good for the life of the centrifuge.
Clean up the water in the centrifuge chamber
The sigma centrifuge uses refrigeration when it is running. It is frosted in the centrifugal chamber due to the moisture of the air, and is frosted into water after the shutdown. Most foreign low-speed large-capacity centrifuges have no drainage holes, and the water in the centrifugal chamber is more and more accumulated. At this point, the user should remove the rotor and clean up the accumulated water. When reinstalling the rotor, be sure to install it to avoid accidents.
Sigma centrifuge broken shaft accident
The rotor is not placed well, or the sample imbalance is too large, and the centrifuge starts. Modern imported centrifuges have unbalanced protection, that is, when the unbalance amount exceeds a certain limit, the power should be automatically cut off to stop the centrifuge. However, under the above circumstances, it is already late, and a serious accident will occur. One of the malignant accidents is the broken shaft. Due to the sudden break of the shaft during high-speed rotation, the centrifugal rotor has no support, and the centrifugal machine is turned into a chaotic collision, which can make the centrifuge rotate the machine to a 270° angle. At this time, if there are staff or equipment next to it, it will cause accidents and deaths of the staff and damage to the equipment.
The above is the correct installation of the sigma centrifuge. Do you understand clearly?
Sigma centrifuge centrifugal principle and high speed centrifuge operating procedures
The sigma centrifugation is the use of the powerful centrifugal force generated by the high-speed rotation of the centrifuge rotor to accelerate the sedimentation velocity of the particles in the liquid, and separate the sedimentation coefficient and the buoyant density of the sample. Therefore, it is necessary to use a centrifugal machine to generate a strong centrifugal force in order to force these particles to overcome the diffusion to produce a settling motion. Restart after shutdown, the fault remains, please contact SIGMA after-sales customer service 010-64117871 for warranty.