1969, Mr. B.zimmern of France invented the first oil-free screw compressor with high sealing and high efficiency, which means the birth of oil-free lubricated screw compressor technology. Once this advanced technology was discovered, it was immediately characterized as military technology by western developed countries, and long-term technical blockade was imposed on developing countries. Then it is widely used in military manufacturing and ship matching. This technology has been applied to the shipboard military oil-free lubricated screw compressor in the United States, Britain, Germany, France and other countries, which makes the oil-free lubricated screw compressor technology of B.zimmern develop rapidly and mature.