High-strength diesel engine swirl nozzle

Abstract

The invention discloses a high-strength diesel engine swirl nozzle which comprises a needle valve body, a needle valve wrapped in the needle valve body and a spray hole formed in the lower end of theneedle valve body. the inner wall surface of the spray hole is a spiral curved surface; and under the action of the spiral spray hole, a mist column formed by spraying of high-pressure oil is spiral,so that air around the spray is entrained and sucked. In a preferred embodiment, the number of spray holes is an even number, and the spiral curve rotating directions of every two adjacent spray holesare opposite. By using the high-strength diesel engine swirl nozzle, the primary crushing quality of near-field spraying can be improved under the condition of high environment density, the secondaryatomization effect of fuel spraying is improved, the evaporation mixing process of fuel is accelerated, and the method can adapt to a high-strength engine. The spiral lines of the adjacent spiral spray holes are opposite, so that a negative pressure area is generated between sprayed oil beams due to the rotational flow effect, surrounding air is attracted to enter the negative pressure area, mutual macroscopic entrainment is formed, the evaporation mixing process of the fuel is accelerated, and the dynamic property, the economy and the emission performance of a diesel engine are greatly improved.

Description

technical field [0001] The invention relates to the technical field of diesel engine fuel injectors, in particular to a high-strength diesel engine plume nozzle. Background technique [0002] Highly strengthened engines need to continuously increase the power density, and increase the pressure in the cylinder through supercharging. However, with the increase in supercharging pressure, the explosion pressure of the engine will also increase, and the environmental density in the cylinder will gradually increase. The matching of the traditional oil and gas chamber will Unbalanced, resulting in poor combustion and lower thermal efficiency. In response to this problem, the applicant hopes that by changing the nozzle structure of the fuel injector, the breaking of the fuel and the mixing process of the oil and gas will change, so as to adapt to the matching of the new oil and gas chamber of the highly strengthened engine, achieve a new balance, and realize the high power strengthe...

AI Technical Summary

Problems solved by technology

[0004] The nozzles of diesel engine injectors widely used at present are mainly designed for injecting fuel into high-temperature and high-pressure environments under normal temperature and pressure. The design of the number and arrangement of nozzle holes can no longer meet the requirements of highly strengthened engines

If used directly, the fuel will be incompletely burned, the flame will be elongated, the combustion efficiency will be low, and a large amount of unburned hydrocarbons will be produced, causing serious pollution problems

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