Sealing structures and vacuum furnaces

A vacuum furnace, comprising:

• a furnace body, an opening being provided on a side wall of the furnace body;
• and
• a sealing structure, comprising:
• a baffle plate provided with a first through-hole, the first through-hole extending through a first side surface and a second side surface of the baffle plate;
• a first structural component provided with an internal hole for a component to be sealed to extend through, the first structural component being connected to the baffle plate, wherein at least a part of the internal hole is located within the first through-hole, and at least the part of the internal hole is not parallel to both the first side surface and the second side surface;
• and
• a sealing assembly for sealing a gap between the baffle plate and the first structural component and a gap between the component to be sealed and the first structural component;
• wherein the sealing structure is disposed at the opening through the baffle plate.