Closure device and method for filling a closure device

A closure device (1) for a container (2) having a container opening, the closure device (1) comprising:

• a lid member (4) configured for closing the container opening,
• a chamber (9) associated with the lid member (4) and
• an inner housing (5), the chamber (9) and the inner housing (5) having closure means and opening means corresponding to one another, which interact with one another in such a way that a medium contained in the chamber (9) can escape into the container (2) as a result of a movement of the lid member (4) relative to the inner housing (5),
• wherein the chamber (9) is divided by a separating part (6) into a first partial chamber (10) and a second partial chamber (11),
• wherein the first partial chamber (10) and the second partial chamber (11) are arranged one behind the other along a central axis (A) of the closure device,
• wherein the separating part (6) is configured to be moved from a closure position into an opening position, wherein the first partial chamber and second partial chamber are configured such that a first medium can be received in the first partial chamber (10) and a second medium can be received in the second partial chamber (11),
• wherein moving the separating part (6) into the open position enables mixing of the first and the second medium in the chamber (9) to form a mixed medium, and
• wherein the mixed medium can emerge into the container (2) as a result of the movement of the lid member (4),
• wherein the separation part (6) comprises a separating wall (34) extending radially and circumferentially with respect to the central axis (A), and
• wherein, in the closure position, the separating wall (34) rests in a sealing manner on an edge side on a stop shoulder (17) of the chamber (9).