Heat treatment apparatus

A heat treatment apparatus, comprising:

• a treatment chamber unit that is, inside a furnace shell, detachably fixed to the furnace shell;
• and
• a power supply portion, wherein
• the treatment chamber unit includes:
• a treatment container in which a heat treatment is performed on a workpiece;
• a heat insulating material provided inside the treatment container;
• a heater that has a heating element located inside the treatment container and has a terminal located outside the treatment container;
• and
• a busbar that is provided on the outside of the treatment container and is electrically connected to the terminal of the heater,
• the power supply portion is provided outside the treatment container, and
• the busbar and the power supply portion are detachably connected to each other, wherein
• the treatment chamber unit includes a plurality of the busbars,
• the respective busbars are arranged on a first wall surface portion, out of the first wall surface portion and a second wall surface portion, which are a pair of facing wall surface portions of the treatment container,
• the heater has a U-shape,
• a folded portion of the heating element is located inside the treatment container,
• a heater supporting member that supports the heater is provided on the treatment container,
• the heater supporting member includes an extending portion that extends from the second wall surface portion of the treatment container toward the inside of the treatment container and supports the folded portion of the heating element, and
• the extending portion slopes downward with respect to a horizontal plane as the extending portion moves away from the second wall surface portion of the treatment container.

A heat treatment apparatus, comprising:

• a treatment chamber unit that is, inside a furnace shell, detachably fixed to the furnace shell;
• and
• a power supply portion, wherein
• the treatment chamber unit includes:
• a treatment container in which a heat treatment is performed on a workpiece;
• a heat insulating material provided inside the treatment container;
• a heater that has a heating element located inside the treatment container and has a terminal located outside the treatment container;
• and
• a busbar that is provided on the outside of the treatment container and is electrically connected to the terminal of the heater,
• the power supply portion is provided outside the treatment container, and
• the busbar and the power supply portion are detachably connected to each other, wherein
• the treatment chamber unit includes a plurality of the busbars,
• the respective busbars are arranged on a first wall surface portion, out of the first wall surface portion and a second wall surface portion, which are a pair of facing wall surface portions of the treatment container,
• the heater has a U-shape,
• a folded portion of the heating element is located inside the treatment container, and
• a pop-out prevention member that prevents the heater from popping out of the first wall surface portion of the treatment container is provided on the first wall surface portion of the treatment container.

A heat treatment apparatus, comprising:

• a treatment chamber unit that is, inside a furnace shell, detachably fixed to the furnace shell;
• and
• a power supply portion, wherein
• the treatment chamber unit includes:
• a treatment container in which a heat treatment is performed on a workpiece;
• a heat insulating material provided inside the treatment container;
• a heater that has a heating element located inside the treatment container and has a terminal located outside the treatment container;
• and
• a busbar that is provided on the outside of the treatment container and is electrically connected to the terminal of the heater,
• the power supply portion is provided outside the treatment container, and
• the busbar and the power supply portion are detachably connected to each other, wherein
• a conveyance roller that carries the treatment chamber unit is provided on an inner surface of a bottom surface portion of the furnace shell.