Refining furnace, oxygen-free copper casting device and oxygen-free copper production system

The utility model discloses a finery, oxygen-free copper casting device and oxygen-free copper production system.The finery comprises a heat preservation refining chamber and a to-be-cast buffer chamber, and the heat preservation refining chamber comprises a heating mechanism, a first containing cavity, a fluid output pipe and an external force applying mechanism used for applying pressure into the first containing cavity from top to bottom; the to-be-cast buffer chamber comprises a second containing cavity and a fluid input pipe communicating with the second containing cavity, an inlet of a fluid output pipe communicates with the first containing cavity, an outlet of the fluid output pipe communicates with the fluid input pipe, and the height of the inlet of the fluid output pipe in the vertical direction is smaller than that of the outlet of the fluid output pipe in the vertical direction. The utility model further discloses an oxygen-free copper casting device comprising the refining furnace and a crystall