Fermentation device

A fermentation device, is characterized in that:

• it comprises an insulating jacket, a fermentation tank installed in said insulating jacket, a base mounted on the bottom of the insulating jacket, a top connector connected to the top opening of the fermentation tank, a headstock set in the top connector, a bottom connector connected to the bottom opening of the fermentation tank and a return pipe sandwiched between the outer wall of the fermentation tank, and the inner wall of the insulating jacket;
• the top and bottom of the said insulating jacket being respectively opened with an upper and a lower perforation, said top connector protrudes through the upper perforation to the outside of the insulating jacket, said bottom connector protrudes through the lower perforation to the outside of the insulating jacket, said headstock is located outside the insulating jacket, said bottom connector is provided with an opening at the bottom end, between said inner wall of the insulating jacket and the outer wall of the fermentation tank are enclosed to form an upper convergence chamber, a flow channel, and a lower convergence chamber, said upper convergence chamber, flow channel, and lower convergence chamber are sequentially connected, the number of said flow channels is a plurality, and the plurality of flow channels are distributed in a circular array around the central axis of the fermentation tank, the bottom of said insulating jacket is opened with a liquid inlet hole and a return hole, said liquid inlet hole is connected to the lower convergence chamber, the top of said return pipe is connected to the upper convergence chamber, the bottom of said return pipe is sealingly connected to the return hole or sealingly penetrates the return hole.