Depending on the temperature, pressure, presence or absence of particles, and the viscosity of the liquid being transported, the shield pump can be generally classified into normal type (basic type), reverse circulation type (reverse circulation type), high temperature type, Suction type, mud separation type and designed for ships, nuclear power plants and absorption refrigeration devices with various types of shielding pump. Today's latest valid order information free to send! Morning latest buyers information free to send! Punch grab Rob here! ①ordinary magnetic pump (basic type) is mainly used for conveying vapor pressure is not high, the temperature is not high, non-particle media. In general, the transmission medium temperature does not exceed l50 ℃, the basic type of single-stage impeller can reach 220m. ② reverse circulation type (reverse circulation type) This type of shield pump uses a high pressure within the impeller with the internal circulation structure, suitable for the transport of easily vaporized liquid, sometimes also called easy vaporization type, as shown in Figure 2-16 . The medium flows into the pump chamber from the pump inlet. Most of the medium is discharged from the pump outlet through the rotation of the impeller, and a part of the medium is introduced into the motor. First, the front bearing is lubricated and then flows through the stator shield and the rotor shield The role of cooling motor from the gap, go again after lubrication of bearings. Unlike ordinary shield pumps, this part of the medium does not return to the pump inlet, but flows from the rear reverse orifice to the vapor zone of the inlet tank. ③ high temperature magnetic pump type can transport medium temperature up to 450 ℃. High-temperature shielded pump should generally be equipped with an external cooling system, while using the insulation plate to separate the motor part of the pump head, as shown in Figure 2-17. Even if the temperature of the conveyed medium is as high as 450 ° C, the temperature of the medium circulating inside the motor does not exceed 100 ° C. It is sufficient to use an ordinary insulation class motor. Diaphragm pump Note: When the external can not provide coolant, and the motor power is small, consider the use of special heat-resistant coil to adapt to high temperature conditions, the use of its temperature is generally below 400 ℃. ④ The high melting point type is equipped with a jacket on the hydraulic end and the motor side of the shielding pump. The jacket can be filled with steam or liquid at a certain temperature to prevent the high-melting liquid from crystallizing, as shown in Figure 2-18. If the shield pump uses an external circulation tube, the external circulation tube should also be steam or electric heat trace. ⑤ Self-priming self-priming shielded pump is suitable for pumping liquid below the container below the center line of the pump inlet pump, pump can work when the shield pump is restarted after the pump is stopped, as shown in Figure 2-19 Show. Usually inhalation of the maximum lifting height, the distance from the liquid level to the pump suction centerline, up to 6 ~ 7m. ⑥ mud separation for the medium containing suspended particles transport. The mud-type shield pump is equipped with an external flushing hole on the motor side. Using a clean and proper flushing fluid, the motor is injected from the flushing hole to cool the motor and lubricate the bearing while preventing the particles from entering the motor. As shown in Figure 2-20 Show. A spacer ring or mechanical seal is provided between the motor and the pump.
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