Needle valve body of oil nozzle of diesel engine

Abstract

The invention belongs to the field of oil nozzles in diesel engines, and particularly relates to a needle valve body of an oil nozzle of a diesel engine. The needle valve body comprises a body and an end body of the needle valve body, wherein a pressure chamber is processed in the end body of the needle valve body; the pressure chamber is divided into an upper pressure chamber, a middle pressure chamber and a lower pressure chamber; the upper pressure chamber and the lower pressure chamber are arranged in a frustum shape; the middle pressure chamber is arranged in a round groove shape; and the middle pressure chamber is arranged between the upper pressure chamber and the lower pressure chamber. The needle valve body provided by the invention has the advantages that: the injected oil is compressed by the upper pressure chamber, then swelled by the middle pressure chamber and then compressed by the lower pressure chamber to form fuel oil with a great pressure to be injected, thus the volume of the pressure chamber is saved, the burning effect of the fuel oil is improved, and the emission of toxic gases is reduced.

Description

technical field [0001] The invention belongs to the field of fuel injectors in diesel engines, and in particular relates to a needle valve body of a diesel engine fuel injector. Background technique [0002] The size of the pressure chamber volume of the needle valve body of the fuel injector of the diesel engine has a significant impact on the performance and emission of the engine. Because in the later stage of combustion, although the needle valve is closed, there is always a certain amount of fuel stored in the pressure chamber; this part of the fuel expands or evaporates due to high temperature, and part of it will enter the combustion chamber. This part of the fuel is not sprayed in the form of mist under high pressure, but enters the combustion chamber in the form of dripping, so it cannot mix and burn normally with the air. This will not only deteriorate the performance of the diesel engine, but also produce more incomplete combustion emissions, and also easily incr...

AI Technical Summary

Problems solved by technology

However, due to the structural characteristics of the non-pressure chamber, the circulation area after the needle valve is lifted cannot meet the requirements of the oil volume of the whole machine, so the needle valve body cannot adopt the non-pressure chamber structure

However, the previous cylindrical pressure chamber has a large volume, which has a negative impact on the performance and emission of diesel engines.

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