Air compressor for fuel cell

Abstract

The invention discloses an air compressor for a fuel cell. The air compressor comprises a motor and an air compressor body. The motor comprises a casing with two open ends, end covers arranged at the two ends of the casing, a motor shaft with two ends in running fit connection with the corresponding end covers and penetrating out of the corresponding end covers, and a stator arranged in the casing and surrounding the motor shaft; the air compressor body comprises an air compressor shell internally provided with a cavity, a low-pressure-stage air compressor wheel close to an air inlet and a high-pressure-stage air compressor wheel; one end of the air compressor shell is fixed to the first end cover, the air inlet is formed at the other end of the air compressor shell, a tangential air outlet is formed in the air compressor shell, and the air inlet and the tangential air outlet are both communicated with the cavity; the two air compressor wheels are arranged on the motor shaft extending into the cavity in series; and a fluid director is arranged in the cavity between the two stages of air compressor wheels, and the two air compressor wheels and the fluid director divide the cavity into a circuitous airflow channel. Under the condition that the compact structure is guaranteed, the air compression efficiency and the output pressure are improved, and the overall reliability of the air compressor is effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of air compressors, in particular to an air compressor for fuel cells. Background technique [0002] The fuel cell industry is a new energy industry that is vigorously developed in my country at present. With the gradual improvement of technologies such as stack materials, the demand for air pressure entering the stack is also increasing, which makes the air compressor need to continuously increase the output pressure to meet the needs of electricity heap demand. At present, there are two main ways to increase the pressure of the air compressor, one is to increase the power to increase the speed of the single-stage compressor, and the other is to compress the two-stage compressor. [0003] At present, in the traditional two-stage air compressor in the industry, the two compressors are located at both ends of the air compressor, and there is a connecting pipe across the air compressor in the middle to input t...

AI Technical Summary

Problems solved by technology

The traditional two-stage air compressor has the following disadvantages. 1) During the process of inputting compressed air from the low-pressure stage of the air compressor to the high-pressure compressor, the high-pressure stage compressor wheel is subjected to a very large axial pressure, and pressure balance needs to be considered to overcome this axial pressure. At the same time, the test of the thrust bearing is also very large, which has a great impact on the overall reliability of the air compressor; 2) Since the compressor is distributed at both ends and there is a connecting pipe in the middle, the aerodynamic loss of the air is very large, and the efficiency of the compressor is low , and the volume is relatively large, which is not conducive to the miniaturization of the air compressor; 3) Due to the use of two-stage compression, the overall aerodynamic power consumption of the air compressor has doubled, coupled with the aerodynamic loss, making it comparable to a single-stage air compressor Compared with the power consumption increased significantly

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