Shield pump working principle and type

Shielded pump works Shielded pump head and motor are enclosed in a medium filled with pumped medium pressure vessel, the pressure vessel only static seal. Shielded pump impeller and the motor rotor is fixed on the same axis, the shield sleeve motor will be separated from the stator and rotor, transferred to the media being transported, the power transmitted through the stator field to the rotor, as shown in Figure 2 -15. The transported medium flows into the magnetic pump from the inlet of the pump, and the inside of the pump casing cavity is rotated and pressurized by the impeller, and most of the medium is discharged from the outlet of the pump. While part of the medium is introduced into the motor, the first lubrication of the front bearing, and then through the stator shield sleeve and the rotor shield sleeve cooling motor role, and then to lubricate the rear bearing, and finally from the rear into the center of the rotor shaft through-hole back to the pump s population. The internal circulation of the medium is achieved by the differential pressure between the pump outlet and the inlet. 2. Shielding pump type Depending on the temperature, pressure, presence or absence of particles, and the viscosity of the fluid to be delivered, the shield pump can be divided into normal type (basic type), reverse circulation type (reverse type), high temperature type and high Melting point type, self-priming type, mud separation type and designed for ships, nuclear power plants and absorption refrigeration devices with various types of shielding pump. ① ordinary type (basic type) 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 expelled from the pump discharge outlet through the rotation of the impeller, and part of the medium is led to the inside of the motor. First lubricate the front bearing and then flow through the stator shield and the rotor shield Cover the role of cooling motor from the gap, go back to the bearing lubrication. 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 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. 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 pump is suitable for pumping liquid from the container below the centerline of the pump inlet. When the priming pump is restarted after stopping the pump, it is not necessary to pump the pump, as shown in Figure 2-19 As shown. Usually inhalation of the maximum lifting height, the distance from the liquid level to the center line of the suction pump, 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. Fill carbon fiber, glass fiber and other non-metallic materials. ④ In some special occasions, you can also choose ceramic or metal shield pump bearing material. Because shielded pump bearings do not use oil lubrication, so it can withstand smaller radial loads and axial loads. Design, we must adopt a variety of ways to reduce the bearing load.

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