Magnetic pump and shield pump on the principle of selection 1, the power of less than 10KW pump, use a magnetic pump to ensure that the results. 2, when the pump shaft power is greater than 10KW or the medium temperature is higher than 100 ℃, the selection of domestic magnetic pump should be carefully handled, deal with the magnet material, bearing material structure to be limited, if necessary, should be used shielding pump. 3, the current domestic magnetic pump manufacturers are generally medium and small plants, development and research and development tools is weak. For the pump beyond the range of product parameters, it is generally not suitable for the manufacturer to develop or develop the pump to ensure the quality and progress of the project. Removed the mechanical seal pump, mechanical seal completely eliminate the pump inevitable run, run, drip, leakage of the shortcomings of the plant is the best choice for leaks. As the pump flow components selected stainless steel, engineering plastics to manufacture, so as to achieve the purpose of corrosion resistance. Pump magnetic coupling and pump body as a whole, so compact, easy maintenance, safety and energy saving. Pump magnetic coupling can drive motor overload protection. Magnetic fluid pump medium density of not more than 1300kg / m3, the viscosity of not more than 30 × 10-6m3 / S of non-ferromagnetic and fiber-containing liquid. Conventional magnetic pump rated temperature for the pump body made of metal or F46 lining, the maximum operating temperature of 80 ℃, rated pressure of 1.6MPa; high temperature magnetic pump temperature ≤ 350 ℃; for the pump body is non-metallic, the maximum temperature is not Over 60 ℃, rated pressure of 0.6MPa. Shielding pump is a centrifugal seal pump, pump and drive motor are enclosed in a pumped medium filled pressure vessel, the pressure vessel is only static seal. This construction eliminates the need for rotary shaft seals in conventional centrifugal pumps to be completely leak-free. Shield pump pump and motor together, the motor rotor and pump impeller fixed on the same axis, the shield sleeve motor will be separated from the stator and rotor, the rotor is transported medium, the power through the stator magnetic field Pass to the rotor. Shield hydraulic end of the pump can be used in accordance with the general centrifugal pump structure and the relevant standards, design and manufacture specifications. Compared with a sealed pump, eliminating the need for maintenance and replacement of the seal trouble, but also eliminates the coupling, a small number of parts (only mechanical seal pump 30%), high reliability. No rolling bearings and motor fan, do not need to add lubricating oil, and smooth operation, low noise [usually 60 ~ 65dB (A)]. Configurable bearing wear monitor to detect bearing wear. Compact structure, small footprint, low base and base requirements, no centering problems with coupling, easy to install and low cost. Routine maintenance workload, low maintenance costs. Can operate normally without leaks when the vacuum system or "vacuum" and "positive pressure" are alternately operated. The material can be fed directly from the vacuum tank to other vessels under high vacuum conditions. Wide range of use, for high temperature, high pressure, low temperature, high melting point and other conditions can meet the requirements. As a result of the use of sliding bearings, and with the lubrication of the media being transported, so poor lubrication of the media is not suitable for shield pump delivery. Generally suitable for shielding pump medium viscosity range of 0.1 ~ 20cP. Shielding pumps are usually less efficient than sealed centrifugal pumps. However, in the case of medium and low power, compared with the double-end seal pump, the latter has little difference in overall efficiency due to the increased power consumption of the cooling and flushing systems. Centrifugal pump operation, the required flow should be higher than the minimum continuous flow. This is particularly important for shielded pumps because in the case of low flow rates, the pump is less efficient and can cause heat to evaporate and cause the pump to spin dry, causing damage to the sliding bearings Shielding and magnetic pumps are all leak-free pumps, but Shielded pump is a higher grade than the magnetic pump, more reliable operation of the pump, therefore, the scope of the use of the intersection of the two, usually larger power, continuous operation, high reliability may consider shielded pump, and general The requirements of the magnetic pump can be selected, the price of the magnetic pump to be cheaper, due to the manufacturing difficulty is much less than the shield pump, the main choice of magnetic material to the rules, more domestic manufacturers, there is inevitable there was a mixed bag, so the choice of magnetic force Pump manufacturers need to choose strong manufacturing capability, reliable credit.
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