Electrically-controlled pressure-storage oil injector

Abstract

The invention provides an electrically-controlled pressure-storage oil injector. The oil injector comprises an oil injector body and a control plunger rod; a control valve, an armature assembly, a solenoid valve spring, a solenoid valve and first compacting mechanism are sequentially arranged above the oil injector body from bottom to top, the control valve is in pressing connection with the oil injector body through a second pressing mechanism, the control plunger rod is mounted in the oil injector body, and the exterior of the control plunger rod is sleeved with a needle valve spring; and the lower end of the oil injector body is provided with an oil nozzle matching part, an oil inlet channel is arranged in the oil nozzle matching part, the control plunger rod and the valve needle of theoil nozzle matching part are of an integral structure, the needle valve spring presses the valve needle of the oil nozzle matching part on the valve body, the large head of the control plunger rod and the oil nozzle matching part form a control plunger cavity in the oil injector body, and the control plunger cavity communicates with the high-pressure oil inlet channel. According to the electrically-controlled pressure-storage oil injector, the pressure of the control plunger cavity is controlled through throttling holes, so that the effect of improving the opening power of the needle valve and reducing the opening resistance of the needle valve is realized, and therefore the oil injection performance is optimized.

Description

technical field [0001] The invention belongs to the technical field of electronically controlled fuel injectors, in particular to an electronically controlled accumulator fuel injector. Background technique [0002] Conventional electronically controlled fuel injectors are divided into structures with accumulator and structures without accumulator. Generally, a control plunger rod is arranged in the pressure accumulation chamber of an injector with a pressure accumulation structure, and the pressure accumulation structure is also called a control plunger chamber. In general design, the control plunger chamber is directly connected with the high-pressure oil inlet passage, and the control plunger chamber is directly connected with the injector assembly. Since the volume of the oil tank of the injector is smaller than the volume of the control plunger cavity, it can be ignored. On the one hand, the control plunger cavity must control the operation of the needle valve, and on...

AI Technical Summary

Problems solved by technology

However, after the volume of the control plunger chamber increases, the structural size of the injector body will increase, and the high-pressure sealing safety of the control plunger chamber also needs to be reconsidered

At the same time, due to the increase in the volume of the control plunger cavity, it is also easy to cause the fuel injection rate to rise too fast at the initial stage of fuel injection, which is not conducive to matching the engine combustion performance.

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