Tumbler and method for its operation

A tumbler for food, the tumbler comprising:

• a container adapted to receive food, the container comprising a fluid channel for food provided on a jacket side, a removal opening for the food provided on a first end face, a supply opening for the food provided on a second end face arranged opposite the first end face, and an extraction opening for a gas provided in container;
• a drive for rotating the container around a rotation axis;
• a rotary leadthrough assigned to the second end face, which comprises a connection module and a rotary module, which is provided to be rotatable with respect to the connection module and is rotatable around the rotation axis together with the container;
• a first leadthrough channel for the food, which is run to the supply opening and provided coaxially to the rotation axis;
• a second leadthrough channel provided as a feed line;
• a third leadthrough channel provided as a return line for the fluid, the second leadthrough channel having an inlet opening for the fluid provided on the connection module, an annular gap formed between the connection module and the rotary module, a feed section formed on the rotary module and a connecting opening formed between the annular gap and the feed section, the third leadthrough channel having an outlet opening for the fluid provided on the connection module, an annular gap formed between the connection module and the rotary module, a discharge section formed on the rotary module, and a connecting opening formed between the annular gap and the discharge section;
• and
• at least one seal for sealing off one of the leadthrough channels.