The bearing system of the magnetic drive pump is divided into two types: radial sliding bearing and thrust sliding bearing, which respectively play the role of supporting the rotational movement of the rotor and restricting the axial movement, and at the same time reducing the movement friction.
The sliding bearing is a hard graphite sleeve, which is sleeved on both ends of the bearing body of the magnetic pump. The thrust sliding bearing is a pair of opposite parts, one part is sleeved on the impeller or the inner magnetic steel body, the material is cemented carbide, the other part is connected with the sliding bearing, and the sliding bearing is installed and then attached to the outside of the bearing body. end.
The lubrication of the bearing relies on the good self-lubricating performance of graphite. At the same time, there are liquid flow holes in the bearing body to introduce the high-pressure medium liquid between the inner magnetic steel body and the isolation cover to reduce the internal magnetic force caused by the magnetic eddy current and hysteresis loss. The temperature of the steel body rises, and then the liquid passes through the central hole of the pump shaft, and part of it cools and lubricates the bearing, and part of it returns to the impeller inlet, which plays a role in circulating cooling and lubrication. The axial force of the magnetic pump is made by drilling balance holes on the impeller, setting seal rings before and after the impeller, and opening liquid flow holes at the bearing body, and introducing high-pressure liquid between the inner magnetic steel body and the isolation cover, so that the rotor can act hydraulically. under auto balance.
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