Hemispherical sealing structure capable of automatically finely adjusting sealing angle

The utility model relates to the technical field of electric control high-pressure oil sprayers, in particular to a hemispherical sealing structure with an automatic fine-tuning sealing angle, which comprises an armature, a ceramic hemisphere and a metering valve, the lower end of the armature is provided with a first curved surface which is also provided with a gettering structure. The ceramic hemisphere comprises a first plane and a second curved surface, and the second curved surface is matched with the first curved surface; the upper end face of the metering valve is a horizontal plane, and an oil outlet is formed in the metering valve and communicated with the upper end face. The upper end face of the metering valve is matched with the first plane. When the fuel injector is closed, the ceramic hemisphere falls down along with the action of the armature to close the metering valve. The sealing angle is automatically adjusted through the self-adaptive adjusting capacity of the ceramic hemisphere, and when