Working principle: The magnetic pump is composed of three parts: the pump, the magnetic coupling and the motor. It is driven by the magnetic coupling, and the motor is an ordinary horizontal three-phase AC motor. The whole of the pump is designed according to the principle of building blocks, without any shaft sealing device, and has the characteristics of completely leak-free. Easy installation and maintenance, all wearing parts can be repaired and replaced on site. Magnetic pump features European excellent hydraulic model with high efficiency Hastelloy isolation sleeve, made by special process, has high precision, good quality, no welding defects, high magnetic permeability and strong corrosion resistance, which fully guarantees the reliable and stable operation of the magnetic pump. The sliding bearing material is made of real crystalline silicon carbide (SSIC, SIC30), which has high strength, good wear resistance, strong corrosion resistance, and its service life is more than 10 times that of graphite bearings. The rolling bearings use imported SKF bearings The magnetic material is samarium cobalt rare earth alloy (Sm2Co17), which has good performance and the highest irreversible demagnetization temperature can reach 450°C After reaching the rated speed, the axial force is automatically balanced by hydraulic Simple and compact structure, using the principle of building blocks, easy installation and maintenance Low operating cost, low maintenance and repair costs, low noise Structural features The H2 refrigeration pump is a multi-stage pump and adopts a high-pressure internal circulation method (as shown in the figure). Part of the medium flows from the high-pressure zone at the outlet of the last stage impeller, flows into the rotor cavity of the shielded motor through the filter screen, and returns to the secondary high pressure of the secondary impeller through the shaft hole. Area. This high-pressure internal circulation method fully guarantees the pressure of the shielded motor rotor cavity and avoids the vaporization of the medium in the pump. The shunt realizes the functions of cooling and shielding the motor and lubricating the sliding bearing at the same time. When the pump is running, the axial force is hydraulically balanced automatically. The NPSH of the pump is very low. For example, when the flow rate is as high as 10m3/h, the NPSH of the pump is only 0.8m.