Smooth introduction to gas bearing defects

So-called smooth smooth bearing means the application of gas agent stop smooth interaction bearing, our common gas smooth agent for air. In is to use gas smooth mechanism of bearing of carrying gas membrane and liquid smooth bearing the same. Thus, smooth gas bearing has the following several major advantages and defects in the application. Smooth gas bearing 1, the advantages of high speed small turbine helium shrinking machine speed reached 650 000 r/min, the linear velocity of 238 m/s, according to the dn value has reached 455 x106mm r/min. 2, high precision error smoothing effects of gas film, its precision is higher than rolling bearing two orders of magnitude, and little vibration, low noise. 3, small gas viscosity friction loss is only one over one thousand of the smooth oil viscosity, so the gas film internal friction stir friction torque is lower than that of the oil film three orders of magnitude. 4, suitable temperature range wide, atomic radiation can resistance to high temperature can reach 300 - 500 ℃, the temperature as low as 10 k gas bearing can still work. 5, pollution-free smooth gas for ordinary air or inert gases, released into the atmosphere does not produce pollution. Bearing little vibration, low noise, also does not constitute a pollution to the environment. 6, long life aerostatic bearing has no direct contact with the metal, the theory of infinite life. Reflect on other conditions, normal should be over 104 h. Dynamic pressure gas bearing stop instantly there is friction between the metal, affected by a certain life, but also in the more than 3000 h. Smooth gas bearing defect 1, bearing can lower than smooth smooth bearing with the same kind of oil gas bearing, bearing to about 1 ~ 2 orders of magnitude lower. Oil bearing can according to the unit area, the smooth bearing for ordinary ( 5 ~ 2) MPa, while gas bearing smooth as long as ( 04) MPa。 2, strong sex difference on the one hand is smooth gas bearing instability, more easily present common hammer vibration and vortex instability phenomenon. On the other hand is smooth gas bearing binding, holding shaft or a attack killed phenomenon also. 3, requirements of manufacturing high precision and high cost because of the gas film is very thin, normal within a few microns to a few microns, and so on parts manufacturing precision request is higher, advances the cost. In addition, there are small holes and spiral groove, throttling porous materials, such as special process request, increase the manufacturing difficulty and cost. 4, request work strict smooth gas bearing demand high cleanliness of the work environment and strict observe operating instructions and to ensure the normal work of the bearing, not attack. To this end, a certain level to limit its widespread application and commercialization.