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First, the internal structure of the electric stirrer must be reasonable;
Second, the stirrer of the electric stirrer must work normally to drive the internal system of the electric stirrer to work together. In general terms, if these two points must be met, relatively speaking, the electric mixer itself is still somewhat difficult.
Because when the electric mixer is working, the stirrer in the stirrer has a great influence on the agitation state of the liquid viscosity, so in terms of the internal stirring medium of the electric agitator, the choice of the stirrer is a kind of Relatively effective method.
Several typical stirrers have different ranges depending on the viscosity. Various stirrers with increasing viscosity are used in the order of propeller, turbine, slurry, anchor, and ribbon, among which the subdivision of the propelling type is small, and the low-speed, small-capacity liquid is proposed when large-capacity liquid is used. Use high speed for liquids. This selection chart does not absolutely stipulate the limitations of the use of slurry type. In fact, the range of use of various types of slurry is overlapped. For example, due to its simple structure, the slurry type can be improved by the baffle, so when the viscosity is low, It is also more commonly used. Turbine type is almost the most widely used type because of its convective circulation ability, turbulent diffusion and shearing force.
1. The selection table proposed by the electric agitator is also selected according to the purpose of the agitator and the flow state when the electric agitator is agitated. Its advantage lies in that the use range of the slurry type is divided according to the characteristics of different agitation processes, making the selection More specific. Comparing with the above table, we can see that the basis and result of electric agitator selection are still relatively consistent. The following describes some of the major processes.
2. The crystallization process of the electric stirrer with stirring is very difficult, especially when it is required to strictly control the crystal size. Generally, it is a small-diameter rapid stirring, such as a turbine type, which is suitable for the crystallization of fine particles, and a large-diameter electric mixer can be used for large crystals in comparison with the actual operation. crystallization.
3. For the decentralized operation process, the electric agitator is most suitable due to its high shearing force and large circulation capacity, especially the shear force of the straight leaf turbine is greater than the shear force of the folding and bending blades, and even more. Suitable for. The propeller type and slurry type have a smaller shearing force than the straight blade turbine type, so they can only be used when the amount of liquid dispersion is small, and the slurry type is rarely used for dispersing operation. Scattering operations have baffles to enhance the shear effect.
4. According to the purpose of the electric stirring process and the flow state caused by the electric agitator, it is judged that the process is suitable for the slurry type, which is a more suitable method. Due to the Soviet Union's choice of slurry type in its own country, it is not the same as the slurry type used in China.
5. The solid suspension operation uses the largest range of turbines, of which the turbine type is best. It does not have an intermediate disc portion, which does not obstruct liquid phase mixing between the upper and lower blades, and the advantage of the curved blade to open the turbine is more prominent. It has good dischargeability and the blade is not easy to wear, so it is more suitable for solid suspension operation. The use of push-type is narrow, and the solid-liquid specific gravity difference is large or the solid-liquid ratio is not more than 50%. When using the baffle, care should be taken to prevent solid particles from accumulating on the baffle corners. In general, the baffle plate is used when the solids and liquids are relatively low, and the axial flow is applied to the vane opening turbine and the propelling type. Therefore, the baffle plate can also be used.
6, the use of electric mixer more specific conditions, not only the electric mixer's slurry type and stirring purposes, there are recommended electric mixer media viscosity range, electric mixer stirring speed range and tank capacity range.
7. The low-viscosity homogeneous liquid mixing of the electric agitator is the least difficult mixing process. It is difficult only when the volume is large and the mixing time is very short.
There are two aspects of electric mixers that are of particular interest when choosing: