Oil inlet and return orifice of common rail oil sprayer and control cavity structure

Abstract

The invention relates to a common rail oil sprayer which comprises an electromagnetic valve1, a chute 2, an orifice plate 3, a groove 4, an oil return orifice 7, a main oil inlet pipe hole 9, a spring seat 10, a spring 11, an oil nozzle needle valve 12, an oil nozzle needle valve body 13 and a low-pressure oil return channel 14. The common rail oil sprayer is characterized in that the top surface of the oil nozzle needle valve 12, a base plate of the orifice plate 3 and the spring seat 10 form a control cavity 8; and a main oil inlet orifice 5 and an auxiliary oil inlet orifice 6 are formed in the orifice plate 3. The control cavity structure adopts two oil inlet orifices, the amount of oil entering the control cavity is not affected, pressure fluctuation is reduced, the needle valve closing speed is increased, the needle valve closing response time is shortened, and a vacuum pumping phenomenon of the control cavity during landing of the oil nozzle needle valve is prevented, so that the oil spraying performance of the common rail oil sprayer is improved, and the engine performance can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of diesel engines, in particular to a common rail fuel injector inlet and outlet oil metering hole and a control chamber structure. Background technique [0002] The high-pressure common rail injector is the most complicated component in the high-pressure common-rail system, and its structure directly affects the injection law of the injector, thereby affecting the working performance of the entire high-pressure common-rail system, and then directly affecting the engine performance. [0003] The working characteristics of the engine put forward very strict requirements on the fuel injection schedule. With the increase of the engine power, the ideal fuel injection schedule should be slow first and then fast, that is, within a fuel injection cycle, the fuel injection speed starts from zero and starts first. Increase slowly, after the duration of the maximum fuel injection speed, the fuel injection speed drops ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a common rail fuel injector, which avoids the technical problems of excessive pressure fluctuation of the fuel inlet manifold and slower closing speed of the needle valve when increasing the fuel inlet hole to improve the performance of the fuel injector

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