Keywords: high temperature, hot oil, hot water, pump, blocking effect, connecting body, heat transfer, exchanger, pump motor,

　　The high-temperature shielded pump is the 1 high-temperature liquid pump that can transport hot oil and hot water. It consists of two parts. The pump body and impeller form a high temperature chamber, and the stator and rotor form a low temperature chamber. Although the liquid in the two chambers is the same, the temperature is different. Due to the blocking effect of the connecting body and the sleeve, the liquids in the two chambers hardly mix together. In addition, the contact area of the end surface of the connecting body with the motor is small, thereby reducing heat transfer from the pump chamber to the motor chamber.
　　High-temperature liquid usually refers to the liquid that is higher than the maximum temperature specified for the motor inlet and lower than 350°C, and the liquid itself does not contain particles and has a low melting point. The high-temperature separation type has a connecting body (also called a heat shield), a heat exchanger and a cooling jacket. Although the temperature of the conveying medium is higher than the specified maximum temperature of the motor liquid, the temperature of the liquid entering the motor is lower than the specified maximum temperature of the liquid at the motor inlet due to the heat shield effect of the connecting body and the cooling effect of the exchanger. The cooling of the pump motor and the lubrication of the bearings are carried out by the forced circulation of the motor circulating fluid through the auxiliary impeller installed at the rear of the rotor.

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