Shielding pumps feature a unique design where both the pump head and motor are enclosed within a pressure vessel filled with the pumped medium. This pressure vessel uses only static seals, eliminating the need for dynamic seals that can leak. The impeller and motor rotor are mounted on the same shaft, and the motor is isolated from the stator and rotor by a shield sleeve. The rotor operates directly within the transported medium, and power is transmitted through the magnetic field of the stator to the rotor, as illustrated in Figure 2-15.
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The fluid being pumped enters the pump through the inlet and flows into the pump housing. In vertical shielding pumps, the impeller rotates to lift the medium, while in horizontal models, the rotation of the impeller helps push the fluid. Most of the medium is discharged through the pump outlet, but a portion is directed into the motor section for cooling and lubrication.
This circulating medium first lubricates the front bearing, then passes through the stator and rotor shield sleeves to cool the motor. After that, it lubricates the rear bearing and finally returns to the pump inlet through a central hole in the rotor shaft. This internal circulation is driven by the pressure difference between the pump outlet and the inlet, ensuring continuous cooling and lubrication of the motor components.
This design not only enhances reliability but also eliminates the risk of leakage, making shielding pumps ideal for handling hazardous or corrosive fluids. Whether you're looking for high efficiency, safety, or long-term performance, shielding pumps offer a superior solution for many industrial applications.
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