Application of turbine refrigerator in bearing field

The gas turbine expander or called the turbine cooler) in the air air conditioning 。 On the occasion of refrigerating capacity is small, round small diameter, high speed, can use gas lubricated bearing. 1969 Airesearch foil bearing has been successfully applied in the military DC - Ten of the ECS later realized for the first time a commercial on a Boeing 727. Then Airesearch for NASA Lewis research center and the U. S. air force A7E series military aircraft developed to replace the original ball bearings of foil bearings, work well. This type of aircraft has play an important role in the war in Vietnam. Because the foil bearing performance is remarkable, funding Airesearch U. S. navy into the long-term comprehensive military aircraft foil bearing series product research and development. After that, from 1976 to 1979, developed by Airesearch foil bearing successfully applied in military aircraft essa - 550，EMB- 120年,ATR - 72年,F - 14 fighter, etc. , and in commercial aircraft Boeing's successful application of 767/757. M - then the United States 1 on the environmental control system of tank is also equipped with foil bearings. At the same time, the United States Hamilton Standard and Mechanical Technology companies are also beginning to send the aspects of the research. Which for the first time, puts forward the concept of type Hydresil foil bearing, namely wave foil type foil dynamic pressure gas bearing. Wave foil foil bearing in the F - 1982 16 fighter test success, then applied to B - success 1 B, B - 2,F - 18日,L - 1011 military aircraft. In 1988, Boeing 747-400 series of civil aircraft are equipped with this type of foil shaft bearing, bearing life has reached the 100000 h. From 1983 to 1988, Hamilton has developed many types of foil bearing for SAAB2000 and EMB - 415 on the plane. In 1993, Hamilton, the company successfully developed the first actually shaft bearing supporting four air chiller with foil, and successfully applied to the Boeing 777 civil aircraft. And through the simulation of 36000 h life of life test, predicting life 30 years, at the same time, the United States Sunstrand company, British airways, ABG meca France and fake the Tupolev company, South Korea's KIST research institute also conducted corresponding research work, the n Dot Engineering Analysis, Mechanical Solution company, South Korea has series of products, such as Turbo companies used in the high speed motor, high speed turbine machinery. South Korean LG company in order to adapt to the needs of small air conditioning system development, developed in recent years the use of R123 and R407C small high-speed centrifugal compressor, cold quantity range of 2. 5 ~ 12. 5RT( 8. 79-43. 95千瓦) , speed is more than 50000 / min, bearing the foil dynamic pressure gas bearing. In addition, when the former in the field of low temperature nitrogen refrigeration, especially in the field of space refrigeration using ammonia, neon as the inverse brayton cycle refrigerating week of refrigerating machine has wide application prospect. NASA and Reare company has developed the refrigeration temperature of 4. 2 ~ 70 k, cold quantity 1 5 w, life is more than 5 years of reverse brayton cryocooler, and apply it to the Hubble space telescope. At present, the United States is developing the second generation of new type of gas dynamic pressure bearing space micro turbine to inverse brayton cycle refrigerating machine; European word shipping board space has also been started in recent years the development of the turbine to inverse brayton cycle refrigerator, and made a certain progress.