High-pressure disc thrust gas bearing adopting double symmetrical contraction sections for gas supply and design method

Abstract

A high-pressure disc thrust gas bearing adopting double symmetrical contraction sections for gas supply comprises an upper working disc (1) and a lower working disc (8) which are arranged in parallel, a gas lubricating film (9) is formed between the upper working disc (1) and the lower working disc (8), and a gas supply component (2) is arranged in the center of the upper working disc (1) and is further connected with an upstream pressure stabilizing cavity. A gas supply hole (3) is formed in the center of the gas supply component (2) and used for introducing gas flow. The double symmetrical contraction sections (4) in a curved surface form are arranged on the downstream of the gas supply hole (3) and are used for smoothly accelerating axial low-speed incoming flow into radial subsonic speed gas flow. According to the high-pressure disc thrust gas bearing, the axial low-speed incoming flow at inlets of the contraction sections is smoothly accelerated into the uniform radial subsonic speed gas flow at outlets of the contraction sections, serious flow separation is avoided at the same time, and the gas flow is further accelerated to the supersonic speed at a gas film outlet. After the gas supply pressure exceeds a certain specific value, the bearing capability of the bearing can be linearly increased along with the increase of the gas supply pressure, and the high-pressure disc thrust gas bearing is suitable for working under high-pressure, heavy-load and large-gap working conditions.

Description

technical field [0001] The invention relates to a static pressure gas bearing under high gas supply pressure, in particular to a high-pressure disc thrust gas bearing and a design method using double symmetrical contraction section gas supply. Background technique [0002] Hydrostatic gas bearing is a kind of bearing that uses gas as lubricant. Its principle is that gas forms a lubricating film under the action of external pressure to support external loads. The gas lubricating film has a homogenizing effect, and the bearing has the advantages of high rotation accuracy, low friction coefficient, high positioning accuracy, minimal friction and wear, and long service life. However, the static pressure gas bearing of the traditional structure also has the disadvantages of small bearing capacity and low stiffness, so that it is only used for light-load precision support. However, with the development of modern cutting-edge industrial technology, it is urgent to develop heavy-dut...

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Problems solved by technology

[0005] Therefore, there is no special method in the prior art to design the gas supply contraction section of the gas bearing that can better suppress the corner flow separation, so that the axial low-speed incoming flow at the entrance of the contraction section can be smoothly accelerated to the radial subsonic velocity at the exit of the contraction section Uniform air flow without serious flow separation, and the radial subsonic air flow at the inlet of the gas film is further accelerated into the supersonic air flow at the outlet of the gas film in the gas lubricating film, so that the bearing capacity of the bearing can increase with the air supply The increase of the pressure increases linearly; the curved surface gradually expanding air intake static pressure thrust gas bearing in the known technology uses the curved surface gradually expanding mixing chamber between the air supply hole and the gas film gap to realize the transition of the flow field, reducing The pressure loss of the flow channel, but it is not given whether the supersonic outflow can be realized at the outlet of the gas film, and the increase in the bearing capacity of the bearing is not ideal.

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