Patent ID: 9212659
Filing Date: 2015-12-15
Classification: F01C,F04C,F16J

Abstract:
1. An apparatus for sealing a pump chamber of a rotary lobe pump vis-a-vis a fluid-free region of a shaft duct of the rotary lobe pump, comprising: first and second sealing elements, configured to be disposed adjacent to a front side of a rotary piston defining a base circle and disposed on a shaft in the pump chamber of the rotary lobe pump in such a way that a labyrinth gap extends between the first and second sealing elements, said labyrinth gap being arranged in a radial direction relative to the shaft and in an axial direction in order to extend a seal land, wherein the seal land is larger in a radial direction relative to the shaft than in an axial direction relative to the shaft, and wherein the first sealing element is formed as an annular disk and has an outer diameter which extends beyond the base circle of the rotary piston.