Capsule for beverage preparation

1. A food or beverage preparation system comprising:

(i) a container comprising walls defining at least one compartment adapted for containing at least one precursor ingredient, the walls comprising at least one fluid connection portion for fluidly coupling to a cooperating fluid connection portion of a food or beverage preparation machine having at least one source of a fluid mixing ingredient, whereby a food or beverage product is prepared within the at least one compartment by mixing the fluid mixing ingredient with the at least one precursor ingredient, the container further comprising at least one food or beverage delivery wall, the container comprises a built-in pump made of a closed but deformable volume of the container that is able to alternatively expand and retract, hence suitable for pumping the fluid mixing ingredient from the at least one source when the container is fluidly connected to the food or beverage preparation machine and for generating a fluid circulation within the at least one compartment, such that a food or beverage product is prepared and expelled through the at least one food or beverage delivery wall, the built-in pump constitutes an upper injection wall and a rigid distributor wall such that the rigid distributor wall is located between the upper injection wall and the least one compartment, wherein the rigid distributor wall comprises at least one through hole; and

(ii) the food or beverage preparation machine, the food or beverage preparation machine comprising a mixing fluid reservoir, a fluid pipe system to which the at least one fluid connection portion of the container is connected by the cooperating fluid connection portion of the food or beverage preparation machine, a mechanical actuator, and a mechanical connection member for connecting mechanically the mechanical actuator to at least one stretchable or deformable portion of the upper injection wall of the container.

2. The system according to claim 1 , wherein the at least one fluid connection portion of the container is adjacent to, or integrated with, the mechanical connection member of the capsule provided by the upper injection wall of the container.

3. The system according to claim 1 , wherein the closed but deformable volume of the container comprises:

(i) the least one stretchable or deformable portion of the upper injection wall of the container, the at least one stretchable or deformable portion is capable of being alternatively outwardly, then inwardly, elastically stretched or deformed by an outside thrust actuator of the food or beverage preparation machine, without tearing or breaking, such that the closed but deformable volume alternatively increases then decreases in pumping cycles;

(ii) an admission opening that provides a fluid connection between the food or beverage preparation machine and the closed but deformable volume, from a source of water towards an interior of the closed but deformable volume; and

(iii) an exit opening that allows a fluid connection from the interior towards an outside of the closed volume,

wherein the admission opening comprises an inlet check valve, and/or the exit opening comprises an outlet check valve.