Injector nozzle matching parts for diesel engine

Abstract

The invention relates to injector nozzle matching parts for a diesel engine, which comprise an injector nozzle body (1), an injector nozzle needle valve (2), a needle valve spring (3), a fuel injector body (4), a fuel injector middleware (5) and a compression nut cap (6). The injector nozzle matching parts are characterized in that the injector nozzle body (1) and injector nozzle needle valve (2) form injector nozzle matching parts which are arranged below the fuel injector middleware (5); the needle valve spring (3) is arranged at the root part of the injector nozzle needle valve (3); the fuel injector middleware (5) and the injector nozzle matching parts are arranged below the fuel injector body (4) by the compression nut cap (6); and a sealed cone angle formed by the injector nozzle body (1) and the injector nozzle needle valve (2) is 90-150 degrees. The injector nozzle matching parts can effectively lower the limit of the minimum circulating section of the injector nozzle needle valve by means of increasing the sealed cone angle, thus greatly improving the use performance of a series of conventional injector nozzles on the conditions of high revolving speed and large fuel amount.

Description

Technical field [0001] The invention belongs to the field of diesel engines, and in particular relates to a fuel injection nozzle assembly of a diesel engine. Background technique [0002] The power density of the engine can be improved by increasing the rotation speed or the circulating fuel injection quantity. However, as the engine speed increases, the engine combustion cycle is shortened, and the corresponding fuel injection duration period should also be shortened; as the demand for circulating fuel injection increases, correspondingly The fuel supply pressure and the total area of ​​the nozzle holes of the nozzle assembly should be increased. In short, whether it is to increase the speed or increase the circulating fuel injection rate, a higher fuel injection rate is required. [0003] According to the structural design of the nozzle assembly, the main design parameters include needle valve lift, nozzle hole structure, sealing cone angle, and sealing diameter. Among them, m...

AI Technical Summary

Problems solved by technology

When the engine speed is ≥3600r / min, the fuel injection duration is shortened to ≤1.25ms, and the proportion of the time that the minimum flow cross-sectional area of ​​the fuel injection couple is greater than the total surface of the nozzle hole will be ≥40%, and the throttling effect greatly limits the fuel injection speed increase

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