Static pressure gas bearing used for free piston

Abstract

The invention discloses a static pressure gas bearing used for a free piston. Two ends outside of the piston wall are respectively provided with two parallel annular gas tanks vertical to the central line of the piston, the central lines at the bottoms of the annular gas tanks are respectively provided with four radial throttling holes by centering; the throttling holes are respectively communicated with a gas storage cavity; the bottom end of the piston is provided with a piston end cover that is provided with a gas inlet (125) communicated with a compression cavity; three sections of pistonsleeves are arranged outside the piston and a continuous throttling slit exists among the piston sleeves. By adopting the mixed throttling of a small hole and the continuous slit, the gas bearing is not only high in rigidity and bearing capacity, long in service life, small in gas consumption and friction resistance, free of pollution, and easy to manufacture, but also not subject to the influence of spreading effect and gas hammer phenomenon. The stability of the gas bearing is greatly improved.

Description

technical field [0001] The invention relates to the field of bearing workpieces, in particular to a static pressure gas bearing for a free piston. Background technique [0002] Hydrostatic gas bearings have been widely used in the fields of precision engineering, ultra-precision engineering, space technology, cryogenic engineering, medical equipment and nuclear engineering. It is a lubricated bearing that uses high-pressure gas as a lubricant. The gas is supplied by a high-pressure gas source. After being throttled by a throttle, it enters the lubrication gap to form a gas film pressure to support the load. It has the advantages of high precision, low power consumption, no pollution, stable performance and long life. [0003] The static pressure gas bearing is the key component of the free piston, and the stiffness and carrying capacity of its air film are closely related to the throttling form. The structure and performance of the hydrostatic gas bearing play a key role i...

AI Technical Summary

Problems solved by technology

Its disadvantages are: the opening of the axial manifold groove and the circumferential flow limiting groove increases the gas consumption of the static pressure gas bearing and reduces the efficiency of the gas bearing

Its disadvantage is that the number of orifices in each row is too small, resulting in uneven pressure distribution of the air film in the bearing gap, and the air film is easy to be discharged from the end of the bearing and has not completely spread out in the gap to fill the entire bearing. , which is greatly affected by the diffusion effect, resulting in a decrease in the stiffness and load-carrying capacity of the air film

The small hole throttle bearing can get good static stiffness, but it is greatly affected by the air hammer phenomenon and diffusion effect

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