Single-grade direct-driven boost centrifugal air compressor of vehicle fuel cell engine

Abstract

The invention relates to a single-grade direct-driven boost centrifugal air compressor of a vehicle fuel cell engine. The air compressor is driven to rotate through a motor, and comprises a stator, a main shaft, a rotor fixed at the middle part of the main shaft, and an impeller provided with a volute at one end, fixed in the volute and connected with one end of the main shaft; a drive drives the rotor of the motor to rotate at ultrahigh speed; and the two ends of the main shaft are supported through simple support beam support structures. Compared with the prior art, the air compressor adopts an intake boost mode of directly driving the centrifugal impeller by using the high-power motor at the ultrahigh speed, adopts an integral design of an efficient permanent magnet synchronous motor, an oil-free lubrication air foil dynamic pressure bearing and a rotor-main shaft-impeller structure, is small in impeller diameter, is simple and compact in whole structure, is small in size, is light in weight, is convenient for installation and disassembly, can satisfy the air supply use requirement of a fuel cell engine for a traditional full-condition vehicle, and improves the volume ratio power of the fuel cell engine under the condition of not increasing the size of the fuel cell engine.

Description

technical field [0001] The invention relates to the technical field of fuel cell engines, in particular to a high-power ultra-high-speed single-stage supercharged centrifugal air compressor for vehicle fuel cell engines. Background technique [0002] Air compressors are widely used in aerospace, automobiles, pipeline transportation, food packaging and other fields. In addition, air compressors are one of the key components in the auxiliary air supply assembly of new energy fuel cell vehicles. Pressure and flow directly affect the stoichiometric ratio, air humidification characteristics, and water heat management characteristics in fuel cell engines, which in turn affect the voltage output of the fuel cell stack and the power output of the fuel cell engine. [0003] Since the power of high-power vehicle fuel cell engines is in the hundreds of kilowatts class, high-power air compressors with high pressure ratio and high flow rate that meet the air supply requirements of fuel c...

AI Technical Summary

Problems solved by technology

Moreover, the inevitable oil leakage of traditional oil-lubricated bearings will enter the interior of the fuel cell engine and affect the electrochemical reaction of the fuel cell. Therefore, oil-free lubricated bearing supports are the best choice for air compressors

To sum up, from the perspective of the selection of the main shaft diameter, the bearing lubrication method, the bearing support distance, the oil-free air intake requirements of the fuel cell engine itself, and the low-temperature cold start requirements of the fuel cell engine at minus 30 degrees, the existing It is difficult for traditional bearings to meet the performance requirements and use requirements of fuel cell engine air compressors. Even if special bearings can meet the requirements, it will also bring about the problem of rotor dynamics stability. Hotspots and Difficulties

The long-term operation of the air compressor at ultra-high speed will cause the risk of damage to bearings and other supporting components, which will increase the difficulty of fault monitoring and diagnosis. The ultra-high-speed rotor will also cause wind wear on the rotor surface, which will cause heat dissipation and cooling problems.

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