High-speed centrifugal air compressor based on insert type air bearing

Abstract

The high-speed centrifugal air compressor comprises a shell, a stator and a main shaft, a first-stage bearing seat and a second-stage bearing seat which are used for supporting the main shaft are installed on the inner sides of the two ends of the shell respectively, and a first-stage diffuser and a second-stage diffuser are installed on the outer sides of the two ends of the shell respectively. The two ends of the main shaft penetrate out of the first-stage diffuser and the second-stage diffuser and then are provided with a first-stage worm wheel and a second-stage worm wheel respectively, a first-stage volute and a second-stage volute are installed outside the first-stage worm wheel and the second-stage worm wheel and connected through a connecting pipe, the main shaft is fixedly connected with a thrust plate, the thrust plate is located between a first-stage bearing seat and the first-stage diffuser, and a second-stage bearing seat is located between the second-stage diffuser and the second-stage diffuser. Thrust air bearings are installed between the thrust plate and the first-stage bearing seat and between the thrust plate and the first-stage diffuser respectively. Compared with the prior art, the thrust air bearing has the advantages that the top foil and the bump foil of the thrust air bearing are respectively fixed on the insert embedded in the bearing seat or the diffuser, a bottom plate in the prior art is omitted, the bump foil is sleeved on the insert, welding is not needed, and deformation of the bump foil caused by welding is avoided.

Description

technical field [0001] The invention relates to an air bearing, in particular to a high-speed centrifugal air compressor based on a block-type air bearing. Background technique [0002] The high-pressure, high-flow air supply has a significant effect on improving the power output of existing hydrogen fuel cell engines. Therefore, before the general air enters the engine, the intake air must be pressurized. The centrifugal air compressor is an energy conversion device to achieve this goal, and is one of the important components of the fuel cell engine air supply system. [0003] Existing technology, whether it is a high-speed centrifugal compressor disclosed in Publication No. CN112879318A, or a thrust foil dynamic pressure air bearing with a thick top foil structure disclosed in Publication No. CN108286567A, their air bearings use traditional All of them contain a bottom plate, and the corrugated foil and top foil are directly or indirectly connected to the bottom plate, an...

AI Technical Summary

Problems solved by technology

[0003] Existing technology, whether it is a high-speed centrifugal compressor disclosed by the publication number CN112879318A, or a thrust with a thick top foil structure disclosed by the publication number CN108286567A Foil dynamic pressure air bearings, their air bearings are all in the traditional way, including a bottom plate, and the wave foil and top foil are directly or indirectly connected to the bottom plate, and usually the bottom plate is fixed to the diffuser by screws Or on the bearing seat, it not only occupies a limited space, but also under the action of long-term dynamic load, the screws will loosen and break, which will affect the stability of the entire system of the gas compressor

Moreover, the supporting corrugated foil is easily deformed due to welding, causing the corrugated foil to warp, which eventually leads to uneven top waves and uneven air film during operation.

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