Hydrogen circulating pump for fuel cell

Abstract

The invention discloses a hydrogen circulating pump for a fuel cell, and belongs to the technical field of fuel cells. The hydrogen circulating pump comprises a machine shell, a motor, a male rotor and a female rotor, wherein the motor, the male rotor and the female rotor are arranged in the machine shell; the male rotor is connected to the output end of the motor; a gear transmission structure is arranged between the male rotor and the female rotor; the female rotor and the male rotor each comprise a rotor base body, an anti-expansion coating and a hydrophobic coating; each anti-expansion coating is arranged on the outer surface of the corresponding rotor base body, and the expansion coefficients of the anti-expansion coatings are smaller than those of the rotor base bodies; and each hydrophobic coating is arranged outside the corresponding anti-expansion coating. The anti-expansion coating and the hydrophobic coating are sequentially arranged on each of the surface of the female rotor and the surface of the male rotor from inside to outside, so that the pump is effectively prevented from being stuck.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a hydrogen circulation pump for fuel cells. Background technique [0002] A fuel cell is a device that converts chemical energy into electrical energy. In order to realize the recycling of hydrogen in the fuel cell, a hydrogen circulation pump is generally used to provide power for hydrogen circulation. The gap between the female rotor and the male rotor in the hydrogen circulation pump is very important for the normal use of the pump; if the gap is too large, the gas leakage will be large, and the efficiency of the pump will be low, but if the gap is too small, the machining accuracy of the rotor is required to be high. The female and male rotors are easily stuck. [0003] During the use of the hydrogen circulation pump, as the speed and pressure rise increase, the temperature also gradually rises. The female rotor and the male rotor will thermally expand as the temperature ...

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Problems solved by technology

Furthermore, the recycled hydrogen may contain water vapor, and water droplets are likely to remain on the surface of the rotor. Under low temperature conditions, the remaining water droplets are easy to freeze, which will also cause the pump to be stuck and affect the cold start performance of the entire fuel cell.

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