초록 ▼

A gas compressor, particularly of the kind for boosting pressure in gas transmission and petro chemical process, has an impeller mounted on an impeller shaft of the overhung type mounted on front and rear bearings and having at least one impeller mounted between the front bearing and a front end of

A gas compressor, particularly of the kind for boosting pressure in gas transmission and petro chemical process, has an impeller mounted on an impeller shaft of the overhung type mounted on front and rear bearings and having at least one impeller mounted between the front bearing and a front end of the shaft. Annular seals are provided co-axial with the shaft which separate an inner space communicating with the shaft front end from the suction end gas space which lies outside the seals. The seals include an outer seal and an inner dry gas seal. Pressurized process gas is supplied between these seals at a pressure higher than suction pressure and is vented from the inner gas space at a pressure well below suction pressure to limit gas pressure forces on the front end of the shaft.

대표청구항 ▼

A gas compressor having a housing which defines a duct for pressurized gas extending between a suction inlet and a discharge outlet, an impeller assembly within said duct and rotatable to move gas through said duct from the suction inlet to the discharge outlet end, the impeller assembly being of th

A gas compressor having a housing which defines a duct for pressurized gas extending between a suction inlet and a discharge outlet, an impeller assembly within said duct and rotatable to move gas through said duct from the suction inlet to the discharge outlet end, the impeller assembly being of the overhung type having a shaft mounted on front and rear bearings and having at least one impeller mounted between the front bearing and a forwardly directed end face of the shaft, annular sealing means being provided at the front end of the impeller assembly and coaxial therewith, said sealing means including a first seal acting between said housing and said impeller assembly to inhibit the flow of process gas between said suction inlet and a load control zone located in advance of the end face of said shaft, a second seal to divide said load control zone into first and second chambers, means for supplying clean pressurized process gas to one of said chambers, and means for venting the other of said chambers to control the pressure therein, said end face being located in said other chamber whereby pressure in said other chamber determines gas thrust forces exerted on the shaft end face.