초록 ▼

A gas compressor, particularly of the kind for boosting pressure in gas transmission lines, has an impeller mounted on a shaft located between two bearings with the gas space surrounding the impeller being separated from the bearings by dry gas seals, including a least primary dry gas seals. The pri

A gas compressor, particularly of the kind for boosting pressure in gas transmission lines, has an impeller mounted on a shaft located between two bearings with the gas space surrounding the impeller being separated from the bearings by dry gas seals, including a least primary dry gas seals. The primary dry gas seal adjacent the discharge end of the compressor is of larger diameter than the corresponding seal at the inlet end of the compressor so that pressurized gas acting on the respective rotary parts of the dry gas seals urges the shaft towards the discharge end of the compressor and thus counteracts dynamic forces on the impeller.

대표청구항 ▼

A rotary fluid machine having a housing, a fluid duct extending through the housing between a suction inlet and a discharge outlet, a rotor assembly rotatable in said duct to be impinged by fluid flowing through the duct from the inlet to the outlet and including a shaft rotatably supported on axial

A rotary fluid machine having a housing, a fluid duct extending through the housing between a suction inlet and a discharge outlet, a rotor assembly rotatable in said duct to be impinged by fluid flowing through the duct from the inlet to the outlet and including a shaft rotatably supported on axially spaced bearings and at least one impeller secured to said shaft between said bearings, a pair of seal assemblies disposed at opposite ends of said duct to seal said shaft within said housing and to inhibit efflux of fluid from the duct, at least one of said seal assemblies comprising a pair of axially spaced seals each disposed between said housing and said shaft to define end walls of a chamber formed therebetween with end wall of said chamber being subjected to fluid pressure in said duct and the other end of said chamber being subjected to a second pressure lower than the duct pressure, said seals being of different effective diameters to provide an area differential therebetween whereby a pressure in said chamber in excess of lower than the duct pressure second pressure will generate an additional axial force on said shaft.