Abstract The operating principle and structural characteristics of shielded pump are briefly introduced. The advantages and disadvantages of this type of pump are analyzed. Keywords Shielded Pump Characteristics Selection Performance Characteristic and Type Selection of Canned Motor Pump Tu Jian'an Abstract: The working principle and structural characteristic of Canned motor pump are briefed, the advantages and disadvantages of this pump are analyzed and Puts forward attentions in type With the development of the chemical industry and the improvement of people's awareness of the environment and safety, the requirements for chemical pumps are also getting higher and higher. In some occasions, some pumps are made absolutely No leakage requirements, this demand has contributed to the development of shielded pump technology. Shielded pumps because there is no shaft seal, you can do absolutely no leakage, and therefore the use of chemical devices has become increasingly common. Principle and structural characteristics of a shielded pump Ordinary centrifugal pump drive is through the coupling of the pump impeller shaft and the electric shaft connected to the impeller and the motor together to rotate and work, and the shield pump is a non-sealed pump, pump and The drive motor is sealed in a plenum filled with a pumped medium. The pressure vessel is only hermetically sealed, and a wire set provides the rotating field and drives the rotor. This kind of structure has canceled the rotary shaft sealing device that the traditional centrifugal pump has, therefore can be completely leakless. Shield pump to 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 field Pass to the rotor. In addition, the shield pump manufacturing is not complicated, the hydraulic end of the centrifugal pump can be used in accordance with the structure type and the relevant standard specifications to design and manufacture. 2 shielded pump advantages and disadvantages 2.1 shielded pump advantages (1) fully enclosed. There is no dynamic seal on the structure, there is a static seal at the pump housing, so it is completely leak-free and is especially suitable for the transport of flammable, explosive, valuable liquids and toxic, corrosive and radioactive liquids. (2) high safety. Rotor and stator each have a shield sleeve so that the motor rotor and stator is not in contact with the material, even if the shield sleeve rupture, it will not produce the risk of external leakage. (3) Compact footprint. Pump and motor system as a whole, disassembly do not need to find the center. Low requirements on the base and the foundation, and the daily maintenance workload, low maintenance costs. (4) smooth operation, low noise, without lubricating oil. Because there is no rolling bearing and motor fan, so no need to add lubricating oil, and low noise. (5) a wide range of use. High temperature, high pressure, low temperature, high melting point and other conditions can meet the requirements. 2.2 The shortcomings of the shielded pump (1) As the shielded pump with sliding bearings, and with the media to be transported lubrication, so poor lubrication of the media should not be shielded pump delivery. Generally suitable for shielding the viscosity of the pump medium is 0.1 ~ 20mPa.s. (2) Shielded pump efficiency is usually lower than the single-end mechanical seal centrifugal pump, and double-sided mechanical seal centrifugal pump roughly the same.
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