Two-stage series pressurization direct-driven centrifugal air compressor of fuel cell engine

Abstract

The invention relates to a two-stage series pressurization direct-driven centrifugal air compressor of a fuel cell engine. The two-stage series pressurization direct-driven centrifugal air compressor comprises end covers, a spindle, volutes, impellers, a rotor, a stator and a driver. The spindle is supported by a left-end radial supporting air foil bearing, a left-end radial supporting air foil bearing bush, an air foil axial thrust bearing and a right-end radial supporting air foil bearing, wherein the left-end radial supporting air foil bearing and the left-end radial supporting air foil bearing bush are arranged on the left side, and the air foil axial thrust bearing and the right-end radial supporting air foil bearing are arranged on the right side of the spindle. The left-end radial supporting air foil bearing bush is arranged on the outer side of the spindle in a surrounding manner. The left-end radial supporting air foil bearing is fixed to the outer side of the left-end radial supporting air foil bearing bush. The air foil axial thrust bearing is fixed to the outer side of the spindle in a bush form. The right-end radial supporting air foil bearing is fixed to the outer side of the air foil axial thrust bearing. Compared with the prior art, the two-stage series pressurization direct-driven centrifugal air compressor is more suitable for the air inlet pressurization scene of the fuel cell engine with the high oilless air inlet requirement, and the durability and reliability of the air compressor of the fuel cell engine can be improved.

Description

technical field [0001] The invention relates to the technical field of fuel cell engines, in particular to a two-stage serial supercharged direct-drive centrifugal air compressor for a fuel cell engine. Background technique [0002] Recently, severe smog and haze pollution have occurred frequently in many cities in my country, making people aware of the seriousness of air pollution again. The increasingly severe energy and environmental challenges have made the transformation of transportation energy and power a global consensus. The development of new energy fuel cell vehicles is considered to be an important part of 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 el...

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Problems solved by technology

[0007] 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 and greatly reduce the power output of the fuel cell engine

[0008] 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 50,000 Rpm). The existing traditional rolling and sliding oil-lubricated bearings are difficult to meet the requirements. First, It does not meet the oil-free working environment requirements of fuel cell engines. Second, due to the existence of mechanical friction, the rotor-spindle speed decreases and 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. In summary, these problems have put forward better requirements for the use of bearings that support the ultra-high-speed rotation of the rotor-main shaft-impeller. comprehensively considered and resolved in the machine design scheme

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