Variable-throat ejector used for fuel cell system

Abstract

The invention discloses a variable-throat ejector used for a fuel cell system. The ejector comprises an ejector main body, a nozzle and an electromagnetic valve, wherein a recycling hydrogen inlet anda hydrogen outlet are formed in the inner side of the ejector main body; the nozzle has a high-pressure hydrogen inlet and a gradually shrunk and gradually expanded nozzle for allowing high-pressurehydrogen to flow into the ejector main body; and the electromagnetic valve has a probe for adjusting the cross sectional area size of the nozzle throat and a valve body for controlling the probe to move. By virtue of the variable-throat ejector used for the fuel cell system provided by the invention, the cross sectional area of the throat can be changed according to electric pile power and hydrogen amount needed by the electric pile; the ejector can control the position of the probe through the electromagnetic valve in the working process so as to control the flow of recycling gas in the hydrogen cycle loop; and more specifically, the working performance of the ejector can be controlled automatically, so that the cycle amount of the recycling gas is increased by reducing the cross sectional area of the throat in a small-power working condition of the electric pile.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a vehicle fuel cell power system, in particular to an ejector for a hydrogen circulation system of a vehicle fuel cell system. Background technique [0002] Fuel cell vehicle is a kind of new energy vehicle, which has the advantages of cleanness, environmental protection, high energy efficiency, stable operation, and no noise. Currently, there are more and more researches on fuel cell vehicles. For proton exchange membrane fuel cells, hydrogen and oxygen convert chemical energy into electricity through redox reactions to drive cars. The final product of hydrogen and oxygen is water, which has no pollution to the environment. [0003] Vehicle fuel cell systems generally consist of four parts: air supply system, hydrogen supply system, water and heat management system, and system control. Among them, the hydrogen supply system has two methods: anode closed end and hydrogen circu...

AI Technical Summary

Problems solved by technology

When the stack is output at low power or the amount of hydrogen required for the reaction is small, the flow of hydrogen gas from the hydrogen storage bottle into the ejector will also decrease. Under this working condition, the ejector performance will decrease. Drops don't even have ejector effects

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