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One, the types and characteristics of gas lubricated bearingGas lubrication bearings is to use gas as the sliding bearing lubricant.It USES gas transit (diffusivity, viscosity and thermal conductivity), adsorption and condensability, between the friction pair, the fluid dynamic pressure effect, under the action of static pressure effect and squeezing effect, forming a layer of full film, has the function of bearing load, reducing friction.Gas lubrication bearings generally divided into gas dynamic pressure bearing, aerostatic bearing and three types of gas extrusion bearing.The actual bearing lubrication state often to dynamic and static pressure, dynamic, extrusion, static, and dynamic, static, extruding mixed lubrication status form.1. The advantages of gas lubrication(1) high speedSmall helium turbine expander speed reached 650 650 r/min, the linear velocity of 238 m/s, calculated according to the dn value has reached 455 x106mm r/min.(2) high precisionError smoothing effects of gas film, its precision is higher than rolling bearing two orders of magnitude, and little vibration, low noise.(3) the low friction lossGas viscosity is only one over one thousand of the lubricating oil viscosity, so the gas film internal friction caused by the friction torque is lower than that of the oil film three orders of magnitude.(4) wide range of applicable temperature and atomic radiation resistanceHigh temperature can reach 300-500 ℃, the temperature as low as 10 k gas bearing can still work.(5) no pollutionGas lubrication for air or inert gas, commonly released into the atmosphere does not produce pollution.Bearing little vibration, low noise, also does not constitute a pollution to the environment.(6) long lifeTheory of aerostatic bearing has no direct contact with the metal, for infinite life.Consider other conditions, should be in commonly 104 h above.Dynamic pressure gas bearing start-stop moment there is friction between the metal, affected by a certain life, but also in the more than 3000 h.2. Gas lubricated bearing faults