Vacuum pump with movable trapezoidal seal

A vacuum pump comprising

• a first spiral element that has a first wall that extends spirally about a first axis, that extends in an axial direction from a first support, and that has a first free end face facing away from the first support, and
• a second spiral element that has a second wall that extends spirally about a second axis, that extends in the axial direction from a second support, and that has a second free end face facing away from the second support,
• wherein the first spiral element and the second spiral element are movable relative to one another and are arranged such that the first wall and the second wall sealingly engage into one another while forming pumping spaces,
• wherein the free end face of at least one of the walls has a recess which extends in a longitudinal direction of the wall and in which at least one seal is arranged,
• wherein the recess is laterally bounded by at least one inner wall that extends at least sectionally obliquely to the axial direction and that is configured to cooperate with a side wall of the seal extending at least sectionally obliquely to the axial direction,
• wherein the inner wall is inclined such that the inner wall converges in a direction of the free end face of the at least one of the walls so that the recess narrows or becomes narrower in a direction of an opening of the recess, and
• wherein the seal is movably arranged in the recess and has a trapezoidal cross-section.