First-class processing and testing equipments for highest precision applications.

1. 34 units of Mitsuiseiki (Japan) processing centers.

2. 6 units of Kapp (German) screw rotor grinding machines.

3. 11 units of Holroyd (UK) screw rotor grinding machines.

4. Screw main unit production floor.

5. Screw compressor testing center.

6. 8 units of Hexagon (German) three-coordinates gauging machine.

Differences between Kaishan Compressor's PM variable frequency screw air compressor and mains frequency screw air compressor

Once an mains frequency screw air compressor deviates from its nominal working conditions, its efficiency will decline no matter how energy-efficient it is at nomial conditions, making it less efficient in energy. In contrast Kaishan Compressor's PM variable frequency technology is able to adjust the motor's rotating speed according to demand changes in the air volume, thereby regulating the volume of discharged air and allow the air compressor to maintain high efficiency under any conditions for air usage. Compared with ordinary mains frequency screw air compressor, the PM variable frequency screw air compressor possesses obvious energy-saving advantages whenever there are changes in the air volume required for the system. In addition, the higher the fluctuation the results will be more obvious, and overall energy-saving can be as much as 50%.

Table of Comparison for Energy Efficiency

Take 37kW screw air compressor as an example, all efficiency values were recorded during experiamental tested and the annual pwer usage calculation were based on average operating time of 8,000 hours per annum:

Kaishan high-speed PM crew air compressor compared with ordinary screw air compressor.

Energy-saving per annum: 281,200 - 183,250 = 97,680 kW.

Differences between Kaishan Compressor s PM variable frequency screw air compressor and external variable frequency drive screw air compressor

Ordinary screw compressors can regulate the motor's rotation speed through external inverters to regulate the air discharge volume in order that air volume produced matches that of used and hence achieves energy efficiency. However ordinary screw air compressors are built with motors with mains rated rotating speed, rated power and rated efficiency, whereas external inverters would force the air compressor's motor to deviate from its mains rated rotating speed. Once the ordinary motor deviates from its mains rated rotating speed, its efficiency will be reduced significantly, and the greater the deviation the more significantly the efficiency will be declined. Withing all its rotating speed range, the PM variable frequency screw air compressor is able to maintain extremely high motor efficiency, thus giving it superior energy-saving effect over ordinary screw air compressor with external inverter.

In addition, the regulation range of external inverters for ordinary screw compressor is from 40% to 100%. In other words, when the working condition deviates in excess of 60%, the external inverter will not be able to regulate the motor's rotating speed. In contrast, Kaishan Compressor's PM variable frequency air compressor has a operating speed range of 20-100%, which means that even in the case of 80% deviation from working conditions, Kaishan Compressor's PM variable frequency air compressor can still function effciently.

Table of Comparison for Energy Efficiency of 37kW screw air compressor

Kaishan PM variable frequency screw compressor Annual power consumption: 183.520kW.

Ordinary mains frequency screw compressor Annual power consumption: 281,200kW.

Ordinary variable frequency screw compressor Annual power consumption: 201,280kW.

Screw air compressor with inverter Annual power consumption: 236,800kW.

37kW screw air compressor as an example, all efficiency values were recorded during experiamental tested and the annual pwer usage calculation were based on average operating time of 8,000 hours per annum: Kaishan PM screw air compressor compared with external variable frequency inverter screw air compressor.

Energy-saving per annum: 236,800-183,520=53,280 kW.