Novel common-rail oil injector

Abstract

The invention discloses a novel common-rail oil injector, which comprises an oil injector shell body. A pore plate is arranged at the upper end of the oil injector shell body. A control valve seat is mounted at the upper end of the pore plate. A low-pressure oil duct is installed inside the control valve seat. Oil cavities are installed inside the oil injector shell body and the pore plate. The oil cavities are respectively communicated with a high-pressure oil duct and the low-pressure oil duct. The high-pressure oil duct is connected with an oil inlet. A sealing surface and a switching valve are arranged between the low-pressure oil duct and the oil cavities. Compared with the prior art, the novel common-rail oil injector has the advantages that when injecting oil, the communication process of the high-pressure oil duct and the low-pressure oil duct is short, the high-pressure fuel entering a control cavity will be cut off, the oil return amount is greatly reduced, the oil injection efficiency of the novel common-rail oil injector is increased, the oil temperature rising of the oil injector is reduced, the working stability of the novel common-rail oil injector is ensured, the reliability of the novel common-rail oil injector is improved, also the energy consumption of a flushing pump is reduced, and the novel common-rail oil injector creates conditions for pressure injection of the common-rail system.

Description

technical field [0001] The invention belongs to the field of fuel injection systems for internal combustion engines, in particular to a novel common rail fuel injector. Background technique [0002] The common rail injector forms a control chamber between the control piston and the injector housing. The movement of the armature is controlled by the solenoid valve to control the change of fuel pressure in the control chamber, so as to control the pressure difference between the upper and lower pressure of the control piston and realize the Control the control of piston oil injection and seating. And the control chamber has an oil inlet orifice and an oil outlet orifice, the oil inlet orifice is connected to the high-pressure oil passage, and the oil outlet orifice is connected to the low-pressure oil passage, such as patents CN201210199068.8, CN200880125425.8, CN200810146498.7. [0003] During the fuel injection process of this type of fuel injector, the inlet and outlet or...

AI Technical Summary

Problems solved by technology

This part of the fuel has a high pressure, and the energy is completely transformed into heat, resulting in an increase in the temperature of the low-pressure oil circuit in the injector, which in turn affects the stability and reliability of the injector.

With the increase of the injection pressure, the dynamic oil return of the control chamber is also increasing, which will increase the energy consumption of the fuel supply pump, reduce the economy of the fuel system, and limit the increase of the injection pressure of the common rail system.

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