Performance comparison | Roots blower | Multistage centrifugal air blower | Single stage centrifugal blower | Air suspension blower | Imported maglev blower | MSC series maglev blower |
Bearing | Bearing | Ball bearing | Ball bearing | Tilting-pad bearing | Air foil bearing | Imported magnetic bearing, mature technology, high stability | First magnetic bearing developed independently in China, mature technology, high stability |
Technology source | Made in China | Made in China | Import/domestic | Republic of Korea | Europe | Dalian Polytechnic University |
Service life | 1-2 years | 2-3 years | 3-5 years | 3-5 years | Semi-permanent | Semi-permanent |
Mechanical loss | 2% energy consumption of bearing | 2% energy consumption of bearing | Above 3% energy consumption of sliding friction | Dry friction at low speed, high energy consumption | Electromagnetic induction, low energy consumption of bearing | Electromagnetic induction, low energy consumption of bearing |
Impeller | Type | Casting 2 or 3 blades | Welding steel or casting aluminum | Aluminum alloy three-dimensional flow impeller | Aluminum alloy three-dimensional flow impeller | Aluminum alloy three-dimensional flow impeller | Aluminum alloy three-dimensional flow impeller |
Service life | 5-8 years | 10 years | 15 years | 20 years | 20 years | 20 years |
Aerodynamic efficiency | Low | Low | Medium | High | High | High |
High-speed motor | Motor type | Low-speed asynchronous motor | Low-speed asynchronous motor | Asynchronous ac motor | High-speed permanent magnet motor | Purchased high-speed permanent magnet motor | High-speed permanent magnet motor independently developed |
Transmission type | Belt or coupler | Coupler | Coupler | Direct driving | Direct driving | Direct driving |
Motor efficiency | 86% | 87% | 94% | 95% | 97% | Above 97% |
Speed control | unavailable | unavailable | unavailable | Precise control of speed | Precise control of speed | Precise control of speed |
Speed control method | There is no speed control system. When motor power and rotation speed are fixed, the air volume is fixed | No speed control system unless the variable frequency motor is replaced and the variable frequency converter is added | Guide vane adjustment, mechanical loss | Intelligent DC speed control system changes the speed of the shaft | Intelligent DC speed control system changes the speed of the shaft | Intelligent DC speed control system changes the speed of the shaft |
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Working range | Very small | Very small, it can bebroadenedby adding a frequency converter | Small range of adjustment of air flow and pressure | Wide range of adjustment of air flow and pressure | Wide range of adjustment of air flow and pressure | Wide range of adjustment of air flow and pressure |
Installation | Lifting | Need | Need | Need | No need | No need | No need |
Foundation | Need | Need | Need | No need | No need | No need |
Maintenance | Lubricant | Check every shift, add regularly, medium cost | Check every shift, add regularly, medium cost | Check every shift, add regularly, high cost | No need | No need | No need |
Quick-wear part | Bearing, gear | Bearing, sealing | Bearing, gear, lubricant pump | Bearing, filter | Air filter | Air filter |
Cost | Low | Medium | High | High, no maintenance in China | Low, poor service timeliness | Low, good service timeliness |
Operation | Operation cost | Very high | High | Medium | Low | Very low | Very low |
Investment cost | Very low | Medium | High | High | High | High |
Overall efficiency | 49% | 61% | 68% | 73% | 77% | 77% |
Overall price | Low | Medium | High (imported blower) | Medium | Very high, 1.3~1.5 times of the domestic | Medium |
After-sale maintenance | Short cycle, low cost and high failure rate | Short cycle and high cost | Long maintenance period and high cost | Long maintenance period and high cost | Long maintenance period and high cost | Timely maintenance, independent core components, short maintenance cycle and low cost |