Self-cooling device sealed with magnetic liquid

A self-cooling device sealed with a magnetic liquid, the device comprising:

• a tank body, a pole-tooth, a rotary shaft, the magnetic liquid, a first gasket ring, a second gasket ring, a first pole-shoe, a permanent magnet, a third gasket ring, a second pole-shoe, a fourth gasket ring, a fan, a bolt, an end cover, a second U-shape soaking rod, and a first U-shape soaking rod,
• wherein the first gasket ring and the second gasket ring are respectively installed in two circular grooves located at an exterior circumferential surface of the first pole-shoe, and the third gasket ring and the fourth gasket ring are respectively installed in two circular grooves located at an exterior circumferential surface of the second pole-shoe;
• the first pole-shoe is provided with a first blind hole arranged in a radial direction between the two circular grooves at the exterior circumferential surface of the first pole-shoe;
• the second pole-shoe is provided with a second blind hole arranged in the radial direction between the two circular grooves at the exterior circumferential surface of the second pole-shoe;
• the first pole-shoe and the second pole-shoe each are provided with a plurality of pole-teeth at respective interior circumferential surfaces;
• the rotary shaft has a first end and a second end in an axial direction, wherein the fan is installed at the second end of the rotary shaft through the bolt;
• the first pole-shoe, the permanent magnet, and the second pole-shoe are arranged at a radial side of the rotary shaft and installed in sequence in the axial direction from the first end to the second end of the rotary shaft inside the tank body;
• the magnetic liquid is filled in a space to be sealed between a circumferential surface of the rotary shaft and the interior circumferential surfaces of the first pole-shoe and the second pole-shoe at the plurality of pole-teeth;
• the end cover is installed in the tank body via threaded connection, such that the first pole-shoe, the permanent magnet, and the second pole-shoe are pressed against the tank body by screwing the end cover;
• the tank body is provided with a first through hole and a second through hole, which are arranged at a circumferential wall of the tank body and correspond to the first blind hole at the first pole-shoe and the second blind hole at the second pole-shoe respectively;
• an end of the first U-shape soaking rod stretches into the first blind hole at the first pole-shoe through the first through hole at the circumferential wall of the tank body, serving as a first heat end;
• an end of the second U-shape soaking rod stretches into the second blind hole at the second pole-shoe through the second through hole at the circumferential wall of the tank body, serving as a second heat end;
• the first heat end of the first U-shape soaking rod is of a diameter less than that of the first through hole at the circumferential wall of the tank body, and the second heat end of the second U-shape soaking rod is of a diameter less than that of the second through hole at the circumferential wall of the tank body;
• and
• the first heat end of the first U-shape soaking rod and the second heat end of the second U-shape soaking rod are installed in the first blind hole at the first pole-shoe and the second blind hole at the second pole-shoe via interference fitting, respectively;
• and another end of the first U-shape soaking rod and another end of the second U-shape soaking rod, serving as a first cold end and a second cold end respectively, are arranged at where the fan blows.