Ejector for air circulation of fuel cell and use method of ejector

Abstract

The invention discloses an ejector for air circulation of a fuel cell. The ejector is used in air path circulation of a fuel cell system, and comprises an ejector body; the input end and the output end of the ejector body are respectively provided with a galvanic pile inlet valve and an ejector outlet, and the ejector outlet is used for communicating with a galvanic pile air inlet; a backflow inlet is formed in the inner wall of the ejector body and is communicated with the galvanic pile outlet; and secondary fluid at the galvanic pile outlet is ejected into the ejector body by the backflow inlet, and is fully converged with primary fluid introduced by the electric pile inlet valve. According to the ejector, the structural diameter size of the inlet and the outlet is increased, and the diameter size of the backflow inlet is reduced, so that the ejector is suitable for an air path of a fuel cell system, the ejection requirement of the air path is met, and the liquid ejection function of the ejector is improved. The ejector realizes the circulation of air in the air path, improves the flow of the air in the air path, and increases the humidity of the air in the air path, thereby improving the performance of the fuel cell.

Description

technical field [0001] The invention relates to the technical field of ejectors, in particular to an ejector for fuel cell air circulation and a usage method thereof. Background technique [0002] Fuel cell vehicle technology is developing rapidly. As a power generation device, the fuel cell system converts chemical energy into electrical energy. Hydrogen fuel cells, as a clean energy source and environmentally friendly, have attracted widespread attention. [0003] The air in the fuel cell system needs to be humidified to achieve proper stack operating conditions. The traditional method is to add a membrane humidification at the inlet and outlet of the stack air, so as to humidify the air humidity at the inlet of the stack. However, the cost of the membrane humidifier is relatively high, and the system cost is relatively high; moreover, the membrane humidifier cannot perform air circulation on the air circuit, and the performance of the fuel cell cannot be improved. [0...

AI Technical Summary

Problems solved by technology

However, the cost of this membrane humidifier is high, and the system cost is relatively high; and this membrane humidifier cannot perform air circulation on the air circuit, and the performance of the fuel cell cannot be improved.

[0004] In the prior art, there is an ejector in the hydrogen path, but the diameters of the hydrogen path and the air path in the fuel cell system are different, and the ejector used in the hydrogen circulation path is small in diameter, which cannot meet the requirements of the air path. , and the reflux in the hydrogen path is gas instead of liquid

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