A hydrogen supply and hydrogen return pressure-stabilizing device of a fuel cell automobile power system

Abstract

The invention discloses a hydrogen supply and hydrogen return pressure-stabilizing device of a fuel cell automobile power system, and the device comprises an electromagnetic valve, a proportional valve, an ejector nozzle, an ejector cavity and a hydrogen return ejector port; the electromagnetic valve, the proportional valve, the ejector nozzle and the ejector cavity are sequentially connected in series, the inlet of the electromagnetic valve is connected with a hydrogen storage system of a fuel cell, and the outlet of the ejector cavity is connected with the inlet of a fuel cell stack; the ejector cavity includes an ejector cavity reduction chamber, an ejector cavity mixing chamber and an ejector cavity diffusion chamber in sequence from the inlet to the outlet, wherein the ejector cavityreduction chamber is provided with a hydrogen return ejector port which is connected with the fuel cell stack outlet, and the proportional valve opening control stability is utilized to realize the stable control of hydrogen supply pressure of the fuel cell system; and a relatively high ejection ratio is maintained in a relatively large flow range, and through the ejection reflux effect of the ejection nozzle, the utilization rate of hydrogen is increased, and the hydrogen equivalent ratio of the anode side is improved.

Description

technical field [0001] The invention belongs to the technical field of fuel cell engines, and in particular relates to a hydrogen supply and return hydrogen voltage stabilizing device for a power system of a fuel cell vehicle. Background technique [0002] Since the invention of the automobile in 1886, the automobile has become an indispensable means of transportation and transportation in people's daily life. The automobile industry has also become a pillar industry of the modern economy. The appearance of the automobile has had a huge impact on human society, economy, technology, and culture. The appearance of the automobile has changed the world. With the rapid development of the national economy, my country's automobile industry will also face a period of opportunities for rapid development. With the rapid increase of global car ownership, the energy and environmental problems brought by traditional internal combustion engine vehicles are becoming more and more serious....

AI Technical Summary

Problems solved by technology

The circulation pump has a good circulation effect in the full working range of the stack, but its cost is high, its weight is heavy, and it needs to consume extra power. rise

In contrast, the ejector does not require additional power consumption, has no moving parts, and has the advantages of simple structure, reliable operation, and no pollution. However, in the design of the ejector, it is necessary to combine the size calculation of the ejector with the test data Combined with a large number of empirical and semi-empirical formulas, it can only have better ejection performance within a certain flow range

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