Ejector and fuel cell system comprising same

Abstract

The invention discloses an ejector and a fuel cell system comprising the same. The ejector is used in the fuel cell system and comprises a shell, a first cavity and a second cavity which are spaced from each other are arranged in the shell, and a backflow gas inlet for backflow gas to enter and a gas outlet for mixed gas to flow out are formed in the shell; the backflow gas inlet is communicated with the first cavity, and the gas outlet is communicated with the second cavity; the ejector further comprises a plurality of ejection assemblies, all the ejection assemblies are arranged in the shell and are used for ejecting the backflow gas in the first cavity, and one end of each ejection assembly extends into the second cavity and is communicated with the second cavity. The multiple injection assemblies are arranged in the shell, so that the flow and pressure of an injection gas of the whole injector are increased, meanwhile, the reflux ratio of the reflux gas is increased, and then the flow of the mixed gas of the injection gas and the reflux gas is increased. In addition, the length of the single ejection assembly can be reduced, and therefore the size of the ejector can be reduced.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to an ejector and a fuel cell system containing it. Background technique [0002] At present, the development of hydrogen fuel cell vehicles is changing with each passing day. Most hydrogen fuel cell systems still use the traditional single-nozzle injector, that is, only one injector and one nozzle. A single-nozzle injector, no matter from The gas flow rate, the ejector reflux ratio and the ejector volume can no longer meet the requirements of the new fuel cell system. This is because the gas flow into a nozzle is limited and the pressure of a nozzle is also limited. In order to meet the injection conditions, even if the outlet diameter of the nozzle is reduced to increase the velocity of the injected gas, compared with the fuel cell system, only one nozzle is used, and the flow rate and pressure of the injected gas are still limited. , and the return gas ejected by the ejector gas is al...

AI Technical Summary

Problems solved by technology

In order to meet the injection conditions, even if the outlet diameter of the nozzle is reduced to increase the velocity of the injected gas, compared with the fuel cell system, only one nozzle is used, and the flow rate and pressure of the injected gas are still limited. , and the return gas ejected by the ejector gas is also limited, and the flow rate of the mixed gas after the ejector gas and return gas is mixed is also limited, which cannot meet the requirements of the fuel cell system for the flow rate and flow rate of the fuel gas

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