Oil-free air compressor: Driving industrial green transformation with innovative engine technologyIn the silent subway tunnel, a new type of electric train quietly passed by, and its core braking system was being powered by a domestically produced oil-free air compressor, providing pure energy. In the current industrial sector, oil-free air compressors are revolutionizing the traditional production and usage methods of compressed air at an unprecedented pace. With the continuous increase in global demands for energy conservation, environmental protection, efficiency and reliability, the technology of oil-free air compressors has witnessed successive waves of innovation. From new energy vehicles to urban rail transit, from pharmaceuticals and food to electronic manufacturing, this oil-free technology revolution is advancing in all fields, injecting new vitality into industrial development. 01 Technological Breakthrough: The Path of Innovation for Oil-Free Air Compressors is Accelerating to Full Speed The technology of oil-free air compressors has witnessed remarkable progress in recent years, with numerous innovative designs emerging continuously. The vortex-type oil-free air compressor, as a representative of the new generation of technology, achieves air compression through the circular motion of the stationary and rotating vanes, minimizing vibration and noise to the greatest extent. The e-comp Scroll oil-free scroll-type electric air compressor launched by ZF Commercial Vehicle Solution Division can keep the noise at approximately 67 decibels at the rated operating point, which is equivalent to the normal conversation sound in an office environment. This has completely changed the traditional perception that traditional air compressors have high noise levels. The innovation in materials science and manufacturing processes has laid a solid foundation for the performance improvement of oil-free air compressors. Through the strengthening of rotor materials, unique sealing designs, and high-precision manufacturing techniques, manufacturers have successfully overcome the reliability bottlenecks of traditional vortex technology in high-temperature, high-pressure, and high-vibration environments. Take the oil-free piston air compressor air supply system adopted by the Beijing Subway Yizhuang Line as an example. The R&D team overcame technical challenges in selecting the friction surfaces and surface treatment of the cylinder inner walls, successfully ensuring that the air supply system could meet the mutual sealing requirements and guarantee that the exhaust volume of the air compressor did not exceed 5% of its original value within a lifespan of 10,000 hours (8 years) without the use of lubricating oil. The innovation in structural design is also very exciting. The oil-free centrifugal air compressor uses a high-speed rotating centrifugal shaft to compress air. It does not require the use of lubricating oil for lubrication and sealing, thus avoiding the problems of oil contamination and oil filter replacement. This design not only provides stable high-pressure and high-flow compressed air output, but also reduces energy consumption and maintenance costs due to the elimination of the need for lubrication. 02 Performance Leap: Multi-dimensional Indicators Highlight Technical Advantages The innovative achievements of oil-free air compressors are directly reflected in their outstanding performance indicators. Energy efficiency improvement is one of the most significant accomplishments in recent years. According to industry standards, the energy efficiency of modern oil-free air compressors has reached a relatively high level. For example, the JT/T 1390-2021 standard requires that the energy efficiency of air compressors should not exceed the level specified in GB 19153-2019 as a secondary level. The advancements in noise control technology are equally impressive. International standards impose strict limits on the noise levels of air compressors, and modern oil-free air compressors can easily meet these requirements. For instance, the JT/T 1390-2021 standard stipulates that the noise level of air compressors should be no more than 75 dB(A), while the e-comp Scroll product from ZF has managed to keep the noise at around 67 decibels. Reliability is another clear evidence of the technological innovation in oil-free air compressors. The oil-free air compressor air supply system adopted by the Beijing Dazhong Line significantly reduces the need for additional maintenance during the train overhaul cycle, thereby greatly reducing the maintenance workload and the risk of equipment failure due to improper maintenance. The e-comp Scroll vortex-type electric air compressor from ZF has a lifespan that meets the operational requirements of the entire vehicle's life cycle, demonstrating its outstanding durability. Lightweight design is also an important direction for the innovation of oil-free air compressors. The ZF vortex-type electric air compressor has a total weight of less than 35 kg, which is significantly lighter than traditional air compressors. It can better support the need of electric heavy trucks with "heavy weight" to achieve the goal of vehicle lightweighting. 03 Application Expansion: Multi-domain Penetration Demonstrates the Value of Technology The innovative technologies of oil-free air compressors are shining brightly in various industries. In the field of new energy vehicles, oil-free air compressors have become a key component, directly influencing the stable operation of systems such as vehicle braking and door control. With the accelerated development of the new energy vehicle industry worldwide, the application scope of oil-free air compressors has expanded from the initial hybrid and pure electric types to fuel cell-powered new energy vehicles. Urban rail transit is another exemplary application of oil-free air compressor technology. The 004 and 013 trains on the Beijing Dazhong Line use a domestically produced oil-free air compressor air supply system, and have been operating stably for over three months. This marks a key milestone achievement in the research on the adaptability of oil-free air compressors in the subway. The oil-free piston air compressor air source system, with its unique advantages of being more environmentally friendly, more convenient to operate and more cost-effective, has precisely addressed the pain points in the rail transportation sector. The demand for oil-free air compressors in high-end manufacturing is also very strong. Oil-free centrifugal air compressors are widely used in fields that require high-quality, oil-free compressed air, such as food processing, pharmaceuticals, electronics, textiles, and healthcare. In these applications where strict air quality standards are required, oil-free air compressors offer a reliable solution, ensuring the quality and safety of the final products. The laboratory sector has also become an important market for oil-free air compressors. According to a report by BCG, the laboratory oil-free air compressor market can be divided into non-muffled types and muffled types, and is applied in various fields such as food, laboratories, pharmaceuticals, and hospitals. This indicates that the oil-free air compressor technology has been able to meet the application scenarios with different environments and noise requirements. 04 Green Benefits: Environmental Advantages Drive Industry Towards Sustainable Development The technological innovation of oil-free air compressors has not only achieved breakthroughs in performance, but also demonstrated significant advantages in terms of environmental protection. Direct emission reduction is its most obvious contribution to environmental protection. In the process of compressing air, oil-free air compressors no longer rely on lubricating oil, thus avoiding the pollution of oil to critical components such as braking systems and air springs from the source. This not only reduces the impact on the environment, but also makes the train operation more in line with the urban transportation development concept of "green and low-carbon". The indirect emission reduction brought about by energy efficiency improvement is also not to be underestimated. Oil-free air compressors have high compression efficiency and can provide stable high-pressur
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