Integrated hydrogen circulating pump in fuel cell system

Abstract

The invention relates to the technical field of hydrogen fuel cells, particularly to an integrated hydrogen circulating pump in a fuel cell system. The integrated hydrogen circulating pump comprises ahydrogen circulating pump, wherein a motor driving shaft is arranged in the middle of the hydrogen circulating pump, a spline shaft sleeve is arranged outside the motor driving shaft, a permanent magnet synchronous motor rotor is arranged outside the spline shaft sleeve, a shaft sleeve front section interference fit face is arranged in the middle of the outer portion of the motor driving shaft, aflange face installation screw is arranged on the side, away from the shaft sleeve front section interference fit face, of the outer portion of the motor driving shaft, a bearing is arranged at the position, close to the shaft sleeve front section interference fit face, of the outer portion of the motor driving shaft, an involute internal spline is arranged at the position, close to the flange face installation screw, in the spline shaft sleeve, a rectangular tooth groove is formed in the permanent magnet synchronous motor rotor, a shoulder step is arranged at the position, close to the shaftsleeve front section interference fit face and the middle of the permanent magnet synchronous motor rotor, outside the spline shaft sleeve, a flat square is arranged on the shoulder step. According to the invention, the overall effect is good.

Description

technical field [0001] The invention relates to the technical field of hydrogen fuel cells, in particular to an integrated hydrogen circulation pump in a fuel cell system. Background technique [0002] Hydrogen fuel cell vehicles use the charge transfer during the chemical reaction between hydrogen and oxygen to form an electric current, thereby directly converting chemical energy into electrical energy to drive the motor of the vehicle. In order to prevent the discharge of hydrogen gas that chemically reacts with oxygen to ensure the service life of the hydrogen fuel cell, after the chemical reaction between oxygen and hydrogen inside the hydrogen fuel cell, excess hydrogen needs to be recovered through a hydrogen circulation pump. At present, the motor of the hydrogen circulation pump mostly adopts a permanent magnet synchronous motor, and the installation method of the drive motor is mostly installed independently with a keyway or a spline connection. The installation is ...

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Problems solved by technology

At present, the motor of the hydrogen circulation pump mostly adopts a permanent magnet synchronous motor, and the installation method of the drive motor is mostly installed independently with a keyway or a spline connection. The installation is time-consuming and inconvenient to operate, and it is easy to cause the rotor of the motor to be out of alignment with the rotor of the hydrogen circulation pump , which shortens the service life of the hydrogen circulation pump; the working medium of the hydrogen circulation pump is high-temperature circulating hydrogen, and because the molecular weight of hydrogen is small, it is easy to cause leakage of the hydrogen circulation pump during operation; the hydrogen circulation pump is still in high temperature and high humidity. It is easy to have a large amount of liquid water in the rotor cavity during use, and the accumulated liquid water will easily cause the hydrogen circulation pump to be difficult to start when it encounters a low temperature environment. Therefore, an integrated hydrogen gas in the fuel cell system is required. The circulation pump improves the above problems

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