Magnetic fluid sealing device for sealing fluid medium

A magnetic fluid sealing device for sealing a fluid medium, comprising:

• a housing having a cavity;
• a shaft pivotally arranged in the cavity, and at least one end of the shaft extending out of the cavity;
• a magnetic fluid sealing assembly arranged in the cavity and fitted over the shaft;
• a thermal conductive gasket arranged in the cavity and fitted over the shaft, an inner peripheral surface of the thermal conductive gasket being spaced apart from the shaft along a radial direction of the shaft, the magnetic fluid sealing assembly being spaced apart from the thermal conductive gasket along an axial direction of the shaft;
• a resistance wire arranged in the thermal conductive gasket and configured to be energized and generate heat to vaporize a sealed fluid medium between the thermal conductive gasket and the shaft;
• and
• a condensing pipe arranged in the housing and having a first gas inlet and a fluid outlet, the first gas inlet of the condensing pipe being located between the magnetic fluid sealing assembly and the thermal conductive gasket, and the fluid outlet of the condensing pipe being located on a side of the thermal conductive gasket away from the magnetic fluid sealing assembly;
• wherein the magnetic fluid sealing assembly comprises:
• a plurality of pole shoes arranged in the cavity and fitted over the shaft, and inner peripheral surfaces of the plurality of pole shoes being spaced apart from an outer peripheral surface of the shaft along the radial direction of the shaft, and a magnetic fluid being filled between the inner peripheral surfaces of the plurality of pole shoes and the outer peripheral surface of the shaft;
• and
• a permanent magnet arranged in the cavity and fitted over the shaft, and the permanent magnet being located between two adjacent pole shoes.