Beverage preparation apparatus comprising a mixing chamber

1. Beverage preparation apparatus, the apparatus comprising at least one chamber for receiving and mixing an aqueous liquid and at least one soluble beverage ingredient, the chamber comprising:

a cylindrical lateral side wall comprising a liquid inlet;

a bottom wall comprising a beverage outlet;

wherein the liquid inlet is positioned close to the bottom of the chamber, and

wherein the liquid inlet is configured so that the liquid is introduced in the chamber as a straight jet of liquid, said introduced straight jet extending horizontally and transversely through the internal volume of the chamber along a line, the line being offset relative to the longitudinal central axis of the chamber,

the chamber comprises a first internal bump rising from the bottom wall of the chamber, the first bump separating:

a first area of the bottom wall wherein the introduced straight jet extends horizontally and transversely through the internal volume of the chamber along a line,

from a second area of the bottom wall comprising the beverage outlet,

and

the chamber comprises a second bump rising from the bottom and extending from the lateral side wall of the chamber and presenting a shape designed:

to convert the introduced straight jet of liquid extending horizontally and transversely through the internal volume of the chamber into a swirl upwardly rising along the lateral side wall of the chamber, and

to guide the swirl so that it flows along the line in front of the liquid inlet.

2. Beverage preparation apparatus according to claim 1 , wherein the liquid inlet comprises a nozzle.

3. Beverage preparation apparatus according to claim 1 , wherein the first internal bump extends partially through the section of the chamber and, at its lateral ends, provides paths for the swirl of liquid.

4. Beverage preparation apparatus according to claim 1 , wherein the side of the first internal bump facing the first area is a straight surface.

5. Beverage preparation apparatus according to claim 4 , wherein the first bump is a straight wall rising from the bottom and parallel to the line.

6. Beverage preparation apparatus according to claim 1 , wherein, at the point of the chamber opposed to the liquid inlet along the line, the second bump designs a curve configured to convert the straight jet of liquid into a swirl along the cylindrical lateral side wall of the chamber.

7. Beverage preparation apparatus according to claim 1 , wherein, at the liquid inlet, the second bump designs a curve configured to guide the swirl of liquid in direction of and along the line in front of the liquid inlet.

8. Beverage preparation apparatus according to claim 1 , wherein the first internal bump and the second internal bump partially designs a straight conduit around the straight jet of liquid.

9. Beverage preparation apparatus according to claim 1 , wherein the first bump is designed to decrease the speed of the swirl of liquid in the area of the liquid inlet.

10. Beverage preparation apparatus according to claim 1 , wherein the first bump is designed so as to define a cross section area above the second area of the bottom for the swirl of liquid larger than the cross section area above the first area of the bottom for the jet of liquid.

11. Beverage preparation apparatus according to claim 1 , wherein the first and the second bumps extend upwardly along the same height.

12. Beverage preparation apparatus according to claim 1 , wherein the surface of the bottom of the chamber is inclined in respect of horizontal and the beverage outlet is positioned at the lowest position.

13. Beverage preparation apparatus according to claim 1 , wherein chamber comprises a top cover at the upper end of the cylindrical lateral side wall of the chamber and said top cover comprises a hole defining an inlet for soluble beverage ingredient.

14. Beverage preparation apparatus according to claim 1 , wherein the chamber comprises a funnel attached at the upper end of the cylindrical lateral side wall of the chamber, said funnel extending from the top of the chamber down to the inside of the chamber and said funnel comprising discrete holes.

15. Beverage preparation apparatus according to claim 1 comprising a liquid supply system connectable to the liquid inlet.

16. Beverage preparation apparatus according to claim 15 comprising a dosing device configured for dispensing a dose of soluble beverage ingredient in the chamber.

17. Method for producing a beverage in a beverage preparation apparatus comprising at least one chamber for receiving and mixing an aqueous liquid and at least one soluble beverage ingredient, the chamber comprising a cylindrical lateral side wall comprising a liquid inlet, a bottom wall comprising a beverage outlet, wherein the liquid inlet is positioned close to the bottom of the chamber, and wherein the liquid inlet is configured so that the liquid is introduced in the chamber as a straight jet of liquid, said introduced straight jet extending horizontally and transversely through the internal volume of the chamber along a line, the line being offset relative to the longitudinal central axis of the chamber, the chamber comprises a first internal bump rising from the bottom wall of the chamber, the first bump separating a first area of the bottom wall wherein the introduced straight jet extends horizontally and transversely through the internal volume of the chamber along a line, from a second area of the bottom wall comprising the beverage outlet, and the chamber comprises a second bump rising from the bottom and extending from the lateral side wall of the chamber and presenting a shape designed to convert the introduced straight jet of liquid extending horizontally and transversely through the internal volume of the chamber into a swirl upwardly rising along the lateral side wall of the chamber, and to guide the swirl so that it flows along the line in front of the liquid inlet comprising the steps of:

dosing the chamber with soluble beverage ingredient; and

introducing a liquid through the liquid inlet.