Cartridge receiver, cartridge system, drink preparation machine and method for producing a drink

A cartridge receptacle for producing a beverage, the cartridge receptacle comprising:

• A) a mixing chamber fluidically connectable to a reservoir of a cartridge filled with a beverage substance;
• B) a cartridge emptying device configured to at least partially transfer the beverage substance from the reservoir into the mixing chamber, the cartridge emptying device comprising:
• i) a compressed-air connection configured for connection to a compressed-air source;
• ii) a compressed-air outlet protruding in a direction of the reservoir of the cartridge to blow compressed air into the reservoir;
• iii) a compressed-air line extending from the compressed-air connection to the compressed-air outlet;
• C) a fluid feed for introducing a fluid from a beverage preparation machine into the mixing chamber;
• D) an outlet element;
• C) a cover element comprising a passage opening, the cover element received within the outlet element, the cover element being reversibly connectable to the cartridge and at least temporarily closing a cartridge opening of the cartridge leading to the reservoir;
• E) a protrusion comprising an external peripheral sealing edge, the protrusion protruding into the passage opening of the cover element;
• F) a valve unit formed by the passage opening and the protrusion, the valve unit configured for opening by relative movement between the cover element and the outlet element, wherein the external peripheral sealing edge is configured to bear flat against an inner wall of the passage opening when the valve unit is in a closed state, and wherein the external peripheral sealing edge is configured to pass into a region of the passage opening in a direction of the mixing chamber in an open state to establish a fluidic connection between the cartridge opening and the mixing chamber to supply the beverage substance into the mixing chamber;
• wherein the cartridge receptacle is configured for insertion into the beverage preparation machine to produce the beverage.