High-speed centrifugal air compressor supported by two-stage air foil bearings

Abstract

The invention discloses a high-speed centrifugal air compressor supported by two-stage air foil bearings. The high-speed centrifugal air compressor comprises a water cooling device, an air cooling device and a driving device, and the water cooling device comprises an outer shell, a first air compression end volute, a second air compression end volute, a thrust bearing seat and a binding post; the right side of the front side wall of the outer shell is in threaded connection with a cooling gas inlet connector and a cooling gas outlet connector, and the bottom of the outer shell is in threaded connection with a cooling water inlet connector and a cooling water outlet connector; and the first air compression end volute and the second air compression end volute are fixed to the left side wall and the right side wall of the outer shell through bolts respectively, and the thrust bearing seat is embedded in the right side wall of the first air compression end volute. Axial thrust of two stages of impellers is mutually counteracted, axial force applied by the thrust bearings is reduced, the radial air suspension bearings and the axial air suspension bearings are adopted, an air film is formed through high-pressure air generated by the high-speed centrifugal air compressor, friction between the bearings and a rotor is reduced, mechanical loss is reduced, and the service life of the air compressor is prolonged.

Description

technical field [0001] The invention relates to the technical field of hydrogen fuel cell engine equipment, in particular to a high-speed centrifugal air compressor supported by two-stage air foil bearings. Background technique [0002] At present, the development of new energy fuel cell vehicles is considered to be an important link in the transformation of transportation energy and power, and has attracted much attention. Proton exchange membrane fuel cell is the most mature representative of the current fuel cell family. It is a device that uses hydrogen and air (oxygen in the air) as fuel to undergo an electrochemical reaction, and converts the chemical energy of the fuel directly into electrical energy, and the reaction generates water. It has the advantages of no pollution, high efficiency, wide application, low noise, quick start at room temperature, quick energy replenishment and modular structure, and is likely to become one of the main power sources of automobiles...

AI Technical Summary

Problems solved by technology

[0005] In addition, the electrochemical reaction of the fuel cell is carried out under certain temperature, humidity and gas pressure, and the reaction is accompanied by the release of certain heat. Therefore, the air in the air supply system of the fuel cell engine has high temperature and high humidity. , high pressure, large flow and oil-free characteristics, the intervention of oil will reduce the catalytic effect of the fuel cell catalyst, greatly reduce the power output of the fuel cell engine and affect the service life of the air compressor

[0006] At the same time, in order to increase the pressure and flow of the output air, the centrifugal air compressor often adopts the speed control method of ultra-high speed (above 80,000rpm). The existing traditional rolling and sliding oil-lubricated bearings are difficult to meet the requirements. The oil-free working environment requirements of the fuel cell engine, the second is that due to the existence of mechanical friction, the rotor-spindle speed decreases and the friction loss increases

Even if special bearings can meet the requirements, it will bring about thermal problems of the rotor and problems of rotor dynamic stability

Secondly, it will also cause the risk of damage to supporting parts such as bearings, which will increase the difficulty of fault monitoring and diagnosis.

In addition, the ultra-high-speed rotor will also cause heat dissipation and cooling problems. To sum up, these problems put forward better requirements for the use of bearings supporting the super-high-speed rotation of the main shaft and impeller, which need to be designed in specific centrifugal air compressors. be comprehensively considered and resolved in the

Images