Patent ID: 8769731

Claim:
A vacuum toilet comprising a first volume; a second volume; and a nozzle arrangement; wherein the first volume comprises a first opening for supplying a medium to be disposed of, wherein the first opening can be closed off in a negative-pressure-proof manner, and a drain, to which a negative-pressure-generating device can be connected, for removing the medium to be disposed of; wherein the second volume comprises a reservoir for a flushing medium; wherein the nozzle arrangement includes a nozzle that comprises a nozzle outlet, wherein the nozzle arrangement connects the second volume to the first volume such that the nozzle outlet is directed to the first volume, and the flushing medium, by a pressure differential between the first volume and the second volume, through the nozzle reaches the first volume from the second volume in a directional manner, wherein the pressure differential is caused by negative pressure generated in the first volume; and wherein the first volume comprises an interior wall with a curvature that is at least in part concave, and the nozzle outlet is aligned such that the flow of the flushing medium travels laminarly along the concave curvature, and wherein the geometry of the nozzle arrangement is configured such that the hydrodynamic boundary layer on the toilet bowl is coverable by a laminar flow up to the drain.