a fuel injector

Abstract

The invention relates to the technical field of fuel injectors, and discloses a fuel injector, comprising: a valve housing, on which at least two nozzle hole layers are arranged, and the included angles between each nozzle hole layer and the axis of the valve housing are different. The needle valve is set in the valve housing and forms an oil chamber with the valve housing; the adjustment part is arranged in the oil chamber and is sealed with the valve housing, and the other end protrudes from the valve housing. At least two communication hole layers, at least two communication hole layers are arranged in one-to-one correspondence with at least two nozzle hole layers, and the adjustment member can rotate relative to the valve housing to make one of the nozzle hole layers communicate with its corresponding communication hole layer . The fuel injector disclosed in the present invention has at least two nozzle hole layers with different included angles, which can be applied to various application scenarios, increases the applicability of the fuel injector, and reduces the cost of experiments. During the test, it can be done by rotating the adjusting member One of the orifice layers is communicated with its corresponding connected hole layer, and the rest of the orifice layer is in an isolated state from its corresponding connected hole layer.

Description

technical field [0001] The invention relates to the technical field of fuel injectors, in particular to a fuel injector. Background technique [0002] The nozzle hole angle of the fuel injector in a diesel engine is an important parameter that determines the spray characteristics of the fuel injector, and mainly affects the distribution of the mixture in the cylinder, the combustion process in the cylinder and the emission. A reasonable angle between the nozzle holes of the injector should make a relatively uniform mixture in the cylinder, ensure full combustion, increase the average effective pressure in the cylinder and reduce the generation of soot. On the premise that the parameters such as fuel injection pressure and cylinder size are fixed, if the angle between the nozzle holes of the injector is too small, it is easy to cause mutual influence between the nozzle holes, and the local mixture in the combustion chamber is too rich. If it is large, it will easily lead to ...

AI Technical Summary

Problems solved by technology

During the test, since the angles of the injection holes of each upper injector are fixed, in order to test the working status of diesel engines with different angles, it is necessary to replace the injectors to test the injectors suitable for the diesel engine. In the process, it is necessary to use multiple injectors to determine the angle of the injection hole. Due to the large number of injectors required, the cost of the experiment is relatively high

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