Centrifugal Air Compressor

Product Features

High-Efficiency Advanced Impeller Customized Design｜Excellent Energy-Saving Performance
The impeller is designed using three-dimensional flow theory and full 3D flow simulation. Through advanced flow analysis technology, the performance of the steam compressor is accurately predicted, achieving an adiabatic efficiency of up to 85%. Each impeller is custom-designed according to the user’s specific operating parameters to ensure optimal performance within its high-efficiency zone, resulting in significant energy savings.

Wide Adjustment Range and Stable Vacuum Level
The evaporation capacity covers a broad range and can be adjusted via two methods: VFD (Variable Frequency Drive) and evaporator temperature control. An integrated anti-surge device effectively prevents surge issues, ensuring stable and reliable operation.

Compact Design with Small Footprint
The unit features a skid-mounted structure for easy installation. The centrifugal steam compressor is directly connected to the gearbox casing. The lubricating oil system and motor are integrated on a common base that also functions as the oil tank. This design reduces both weight and floor space requirements.

Low Noise Operation
Advanced volute and impeller design techniques effectively suppress discrete and broadband noise. Active aerodynamic noise control is implemented, enabling quicker noise attenuation and a quieter operating environment.

Minimal Wear Parts, Easy Installation and Maintenance
With fewer wearing components, the system requires less on-site maintenance and supports quick and straightforward installation.

High Level of Intelligence
A comprehensive monitoring and control system managed by PLC integrates vibration and temperature sensors for bearings, inlet/outlet pressure and temperature readings, anti-surge control, start-stop interlock protection, fault alarms, lubricating oil pressure, and oil temperature. All operational data is transmitted in real-time to the "Zhanggu Cloud" intelligent platform, allowing users and project engineers to monitor equipment status remotely and in real time.

Main structure

Impeller
The high-efficiency impeller is designed using three-dimensional flow theory. After strict precision machining, it undergoes static and dynamic balancing calibration and passes an overspeed test at 1.15 times the rated speed to ensure strength and reliability. To meet various steam compressor operating conditions, the impeller can be manufactured from materials such as titanium, duplex stainless steel, and others.

Volute Casing
A circular-section volute is employed, with its wall profile designed as a logarithmic spiral to align with airflow dynamics, minimizing impact on the blower. This results in high flow efficiency, low vibration, and reduced noise. Depending on specific working conditions, the volute casing can be made from stainless steel grades including 304, 316L, 2205, or 2507.

High-speed Rotor
The high-speed rotor consists of the impeller, high-speed gear, and high-speed shaft. The impeller and shaft are connected via a rod, with torque transmitted by end-surface pins or spline teeth. Dynamic balancing is performed in accordance with international standards, achieving up to G1 grade precision to ensure smooth and reliable operation.

Gear
The acceleration gear pair features an involute tooth profile. Both the gearwheel and pinion undergo grinding and nitride-hardening treatments to ensure stable high-speed operation with low vibration and noise. The designed service life of the gears is 20 years.

Bearing
The high-speed shaft is supported by a tilting pad journal bearing composed of multiple flexible pads. These pads can pivot around their fulcrums, providing excellent anti-vibration performance and the ability to automatically adapt to variations in load and speed.

Lubrication System
The lubrication system includes an oil tank and oil pipelines. The unit’s pedestal also functions as the oil tank and is equipped with an immersion-type electric heater and a temperature control switch. The lubrication circuit comprises a main oil pump (driven by the low-speed gear), an auxiliary electric oil pump, a duplex filter, and a heat exchanger. During normal operation, the main oil pump supplies pressurized oil to the gears and bearings. The electric pump provides pre-lubrication before startup and maintains oil pressure during emergencies or shutdowns, also serving as a backup. The high-precision duplex filter is fitted with a differential pressure alarm for maintenance monitoring.

Synchronous Motors and Drives

It is recommended to use permanent magnet synchronous motors (PMSM), available in both low-speed and high-speed versions. These motors deliver high efficiency, meeting the Grade 1 energy efficiency standards as specified in GB30253-2013. With a rated operating efficiency ranging from 94.5% to 97%, they outperform asynchronous motors by 4–6%. Additionally, PMSM offers a simple structure, more compact size, lower noise levels, and superior energy-saving performance.

Monitoring and Control System

The monitoring and control system is specifically designed for the operation supervision of centrifugal steam compressors. It features interlocked startup conditions, anti-surge control, protection against excessively high bearing temperature and excessive vibration, among other functions.

For high-speed centrifugal steam compressors, oil pressure sensors are installed on the lubricating oil supply line to automatically control the start and stop of the auxiliary oil pump. Oil temperature sensors are mounted after the cooler, while high-speed sliding bearings are equipped with temperature and vibration sensors. Primary and secondary instruments and transmitters are installed on the compressor’s inlet and outlet pipelines to measure temperature and pressure. This enables real-time monitoring of various operational parameters, ensuring safe, stable, and reliable compressor operation.