What are the key components of a centrifugal compressor? ?

Typically, a centrifugal compressor consists of a steam turbine, a centrifugal compressor itself, along with its associated lubricating oil system, seal oil system, and control system. 　　The function of the steam turbine is to drive the rotor of the centrifugal compressor to rotate. It consists of a casing, rotor, lubrication system, sealing system, and control system. It controls the amount of superheated steam supplied to the turbine by regulating oil pressure; the steam drives the rotor to rotate, thereby controlling the speed of the turbine as well as the speed of the compressor, ensuring that the compressor operates under stable conditions. The centrifugal compressor is the only machine that performs work in this unit. Several impellers are installed within the same cylinder, and it is equipped with inter-stage seals, floating ring seals, tilting pad bearings, and thrust bearings. 　　The impeller rotates at high speed driven by the prime mover (turbine). When hydrogen enters the impeller, it rotates along with the impeller under the action of the blades; as it exits the impeller, its speed and pressure increase. After passing through the diffuser, the kinetic energy of the hydrogen is converted into pressure energy. The hydrogen is then directed to the next stage for further compression via bends, and the hydrogen exiting the final stage is discharged into the system through a volute. 　　The lubrication system serves to lubricate, seal, dampen vibrations, and cool the turbine and centrifugal compressors in a centrifugal compressor unit. It usually consists of an oil pump and some auxiliary components, which create an oil film of a certain thickness between the bearings and the shaft. 　　The function of the sealing system is to prevent gas leakage at the shaft ends. By using seal oil, an oil film of a certain thickness is formed between the two floating rings of the unit (the inner floating ring and the outer floating ring), and together with seal air at a certain pressure, gas sealing within the machine chamber is achieved. 　　The control system adjusts the operating conditions of the turbine using the control oil supplied by the lubrication station; it is composed of a series of control mechanisms.

For centrifugal compressors specifically, their key components include: the stator (housing), rotor, shaft seal (bearings), and their auxiliary systems. The turbine is just one of the drive methods for compressors; centrifugal compressors can also use other drive methods, such as electric motors.

Stator (housing), rotor, shaft seal (bearing) and their auxiliary systems

Initial classification: I. Compressor main unit； II. Drive machine (motor or steam turbine) – Subdivision of item “I”: The compressor main unit includes: 1. Air side, 2. Gearbox, 3. Cooler, 4. Lubrication system, 5. Control system, 6. Auxiliary components. 1. Gas side includes: 1) Inlet valve (guide vanes), 2) Impeller, 3) Diffuser, 4) Inter-stage pipes, 5) Anti-surge vent valve, 6) Check valve. 2. Gearbox includes: 1) Large gear, 2) Small gear, 3) Radial bearings, 4) Thrust bearings or thrust rings, 5) Oil/gas seals. 3. Cooler includes: 1) Cooler housing, 2) Cooler core, 3) Drain valve (except for nitrogen compressors), 4) Water-gas separator (except for nitrogen compressors). 4. Lubrication system includes: 1) Oil tank, 2) Main oil pump (usually a shaft-mounted pump), 3) Auxiliary oil pump (electric pump), 4) Oil pressure control valve, 5) Oil temperature mixing valve, 6) Oil cooler, 7) Oil filter, 8) Oil mist remover, 9) Oil heater, 10) Oil pipelines and fittings, 11) Lubricating oil. 5. Control system includes: 1) All primary components (for measuring temperature, pressure, vibration), 2) All secondary transmitters, 3) Local control panel, 4) Extended functions for communication with the user’s control room and remote monitoring. 6. Auxiliary components include: 1) Base, 2) Air intake filter (except for nitrogen compressors), 3) High-voltage switchgear, 4) Low-voltage electrical switches, 5) Startup filter, 6) Instrument air filter