Carbondeposition prevention oil sprayer

Abstract

The invention relates to a carbondeposition prevention oil sprayer which comprises a valve body and a plunger arranged in the valve body in a sliding fit mode. The plunger is controlled by a controller at the top end of the plunger. A valve needle is arranged at the bottom end of the plunger. The outer wall of the valve needle is suitable for being in sealed fit with the inner wall of a valve seat in the valve body. A liquid outlet is formed in the inner wall of the valve seat. The valve body is provided with a liquid intake hole for conveying gasoline to the valve seat, and a drainage channel is formed in the valve body. One end of the drainage channel communicates with the liquid outlet, and the other end of the drainage channel communicates with a liquid spray nozzle in the bottom of the valve body. The drainage channel isolates the precise valve needle and the precise valve seat from a combustion chamber in an air cylinder. When gasoline in the air cylinder burns, the valve needle and the valve seat are in a sealed state, carbon particles generated after combustion of the gasoline in the combustion chamber and colloidal materials formed by insufficient combustion are not likely to enter the drainage channel with the sealed upper end, accordingly, the carbon particles and the colloidal materials are prevented from adhering to the portions, at the liquid outlet, of the outer wall of the valve needle or the inner wall of the valve seat, and the situation that deposited carbon blocks a circulation gap between the valve needle and the valve seat after the valve needle is opened is avoided.

Description

technical field [0001] The invention relates to an anti-carbon deposit fuel injector, which is used for fuel supply in cylinders of automobile engines. Background technique [0002] The carbon deposits in the fuel injector of the engine mainly include two situations: the carbon deposits formed in the fuel injector after the gasoline is heated and decomposed in the fuel injector, and the carbon particles or colloids formed by the incompletely burned gasoline in the cylinder. The carbon deposit formed at the nozzle of the fuel injector has been greatly improved with the improvement of gasoline quality and the structure of the fuel injector in recent years; however, with the in-cylinder direct injection gasoline engine The promotion and use of the above-mentioned second type of carbon deposition has become the main factor affecting the fuel injection efficiency of the fuel injector and the atomization of gasoline, so it is necessary to optimize and improve the fuel injector aga...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, fuel injectors with the function of preventing carbon deposition are generally used to enhance the cooling effect of the fuel injector and enhance the heat insulation effect to reduce the formation of carbon deposits in the fuel injector or increase the flow effect of gasoline in the fuel injector. Reducing the deposition of carbon deposits in the injector is mainly aimed at the above-mentioned first type of carbon deposit formation process; using the valve needle of the injector to remove the carbon deposits at the nozzle can remove carbon deposits exceeding a certain thickness, but cannot completely remove the valve Any carbon deposits between the needle and seat

However, the fuel injection pressure of the existing in-cylinder direct injection engine is high, and the matching sealing surface between the valve needle and the valve seat of the fuel injector is more precise. When the fuel injector injects fuel, the opening gap between the valve needle and the valve seat Smaller and more sensitive to carbon deposits on the needle or seat at the gasoline injection port, requiring a more structurally optimized injector

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