Our country's standard will set the performance parameters of the screw pump to the value of the medium viscosity at 7.5x10-5m2/s.
The range of performance parameters and applications of the screw pump are just general conditions of a certain type of screw pump, and not all kinds of screw pumps including this type. The performance parameter value is not the absolute maximum discharge pressure of the double screw pump. 8 (20) MPa means 0.A.IIbIK is called type B twin screw pump and type A twin screw pump has maximum discharge pressure of only 1.6 MPa. The maximum flow rate of 3400 m2/h means the current situation it is Symmetrical cycloid combined helicoids, which we call n-type twin-screw pumps, have lower discharge pressures in this case. If necessary, we can also develop products with higher flow; this type of twin-screw pump is With some media, certain flow values, and certain structures, the highest discharge pressure is currently 8 Mpa or even higher.
Gas-liquid mixing is only suitable for n-type twin-screw pumps, and other types of single-screw pumps cannot be used for gas-liquid mixing. The same non-lubricity liquids are only suitable for n-shaped and "tooth-shaped" twin-screw pumps. Although the three-screw pump can be used in the high pressure range, its axial force balance is difficult to apply only to small flow conditions; although the triple screw pump can adopt double-suction structure and axial force in a large flow rate and therefore automatically balances, the length of the screw However, due to various factors such as deflection and strength, it can only be used for low-pressure working conditions. It is also considered that the large-flow tri-screw pump with a factor of more than 200m3/h in terms of the external dimensions of the product is actually rarely used.
The application of tri-screw pump refers only to the cleanliness of lubricity and low flowability. Actually, after adopting certain measures in structure and materials, it can also be used to transport asphalt containing impurities, but its discharge pressure is low and its service life is relatively low. Short. With the development of science and technology, the successful research of new special materials and other factors have now been successfully developed abroad to deliver low-viscosity, non-lubricious triple screw pumps such as clean water and seawater, although their volumetric efficiency increases as the discharge pressure increases. The decline is very fast. At present, it can only be used for working conditions with lower discharge pressure. The service life is also shorter and the actual use is still very small. But this is a breakthrough result after all.