An apparatus for mixing a liquid or pasty product. The apparatus includes a first housing part (11) and a second housing part (12) assembled together. The assembly of the first housing part (11) and the second housing (12) part forms a housing inner space (17) between an inlet (4) and an outlet (5), a cooling jacket (7) for circulation of a coolant fluid around the housing inner space (17), and a buffer jacket (9) for circulation of a clean fluid, the buffer jacket (9) being formed between the cooling jacket (7) and the housing inner space (17). The buffer jacket protects the mixed product from contamination by the coolant fluid. It also facilitates detection of leakage between the housing inner space and the buffer jacket. The invention also relates to a corresponding method.

The present invention relates to a bubble generating apparatus and a fermentation tank including same. The bubble generating apparatus comprises: an impeller unit which is provided so as to rotate about an axis extending in a reference direction and includes a plurality of blades arranged along a circumferential direction centered on the axis; and a stator unit which is disposed outside the radius of the impeller unit and includes a plurality of holes arranged along the circumferential direction. The stator unit may be spaced outward from the blades in the radial direction.

A blade assembly for a blending system is shown and described. The blade assembly may include apertures formed through a body. The body may include paddles extending from the body. The blade assembly may be rotated to force a fluid through the apertures. The fluid may be frothed by the apertures.

The present invention is in the field of stirring, and particularly relates to a stirring assembly including a rotary shaft and a stirring member. The stirring member is fixedly provided on the rotary shaft. The rotary shaft is provided with a first passage therein. The first passage is formed with an air inlet through one end of the rotary shaft. The stirring member is provided with a second passage therein. The second passage is formed with an air outlet through the stirring member. The second passage is connected with the first passage. In the present invention, when the rotary shaft is rotating, the external air is drawn in from the air inlet and discharged from the air outlet to make the liquid to be mixed by the stirring member with the air discharged from the air outlet.

The present utility model relates to an efficient milk frothing and heating apparatus, including a lid body, a milk jar, a stirring assembly, and a heating assembly, where the lid body includes an upper lid and a lower lid that are fixedly connected, the stirring assembly includes a stirring rod and a stirring spring coil; a bottom of the heating assembly is provided with a heating ring. According to the present utility model, the milk frothing and heating apparatus has frothing and heating functions; the stirring spring coil performs stirring in a center of the milk jar, so that the milk can be frothed uniformly, thereby achieving high frothing efficiency; the heating ring performs heating in the center of the milk jar, so that all parts of the milk can be heated uniformly, thereby achieving high heat transfer efficiency.