Hydrogen circulating pump

Abstract

The invention relates to a hydrogen circulating pump. The hydrogen circulating pump comprises a pump shell and a rotating assembly located in the pump shell, the pump shell is composed of a cooling machine shell and a volute, the cooling machine shell and the volute jointly form an inner cavity used for containing the rotating assembly and sealed with the outside, the cooling machine shell and the volute are in gas phase communication, and the rotating assembly comprises a rotor shaft and an impeller. Suspension support is formed between the rotating assembly and the pump shell through a magnetic suspension bearing; and during working, the inner cavity is filled with a working medium, and the rotating assembly is suspended in the working medium. The pump has the advantages that the structure is simple, hydrogen sealing can be achieved, the rotating speed of the rotor shaft can be increased to guarantee the hydrogen pressurizing function, and therefore miniaturization can be achieved.

Description

technical field [0001] The invention relates to a hydrogen circulation pump. Background technique [0002] The hydrogen fuel cell system needs to integrate the hydrogen circulation system to export the unreacted hydrogen in the fuel cell stack, and then re-introduce the hydrogen fuel cell stack to participate in the reaction with fresh hydrogen after being filtered and pressurized. The accumulated moisture and impurities are exported and can also wet the newly introduced hydrogen. At present, hydrogen circulation pumps or injectors are mainly used to pressurize this part of hydrogen and send it to the fuel cell again. [0003] The centrifugal hydrogen circulation pump has high working efficiency and large flow rate, but requires a higher speed. Compared with air, hydrogen is more difficult to compress. The centrifugal hydrogen circulation pump must reach a higher speed to achieve effective compression of hydrogen. Therefore, the centrifugal hydrogen circulation pump also n...

AI Technical Summary

Problems solved by technology

The impeller of the hydrogen circulation pump is in the environment of hydrogen and water vapor, and the rotor shaft of the motor is supported by mechanical bearings. Water vapor will cause the leakage of lubricating oil of the mechanical bearings, which not only affects the life of the motor but also pollutes the hydrogen environment

Therefore, conventional mechanical bearings must solve the sealing problem of lubricating oil, otherwise the normal use at extremely high speeds cannot be guaranteed

[0004] The Chinese patent with application number 201820734220.0 discloses a fully shielded high-speed centrifugal hydrogen circulation pump, which adopts a shielding sleeve for hydrogen isolation sealing, but has the defects of complex structure and difficult processing

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