Sealing structure for furnace tube, and furnace tube

A sealing structure for a furnace tube, the furnace tube comprising:

• an outer furnace tube, an inner furnace tube, an upper furnace cover, and a lower furnace door, wherein the upper furnace cover and the lower furnace door are correspondingly mounted at upper ends and lower ends of the outer furnace tube and the inner furnace tube in a sealed manner;
• the furnace tube further comprises a rotating device that is arranged in a furnace body;
• a central hole is formed in the lower furnace door;
• a rotating power source is arranged below an outer side of the furnace tube, and a transmission shaft of the rotating power source passes through the central hole to be connected to the rotating device so as to drive a carrier in the furnace tube to rotate;
• and a magnetic fluid sealing assembly is mounted on the outer side of the central hole.