Novel high-pressure common-rail oil injector with built-in pressure accumulation chamber

The invention discloses a novel high-pressure common-rail oil injector with a built-in pressure accumulation chamber. The novel high-pressure common-rail oil injector with a built-in pressure accumulation chamber comprises an oil injector body, an electromagnet, a compression spring and an armature assembly, wherein the electromagnet is fixedly connected to the top end of the oil injector body, the upper end of the oil injector body is sleeved with a control valve seat, the armature assembly is arranged between the top end of the control valve seat and the electromagnet, an energizing coil winds the outer side of the armature assembly and is connected with the electromagnet through a circuit, a ball valve is arranged at the lower end of the armature assembly, the ball valve is located in a conical cavity and makes contact with the top end of the control valve seat, the bottom end of the control valve seat sleeves the outer side of the top end of a control plunger, the outer side of the bottom end of the contr