Micro displacement variable cross-section uniform fine atomization combined type oil spout device

Abstract

The utility model relates to a micro-displacement and variable cross-section uniform and fine-atomization composite fuel injector, which belongs to the fuel injection device of the fuel system of an internal combustion engine. It is a high-precision coupling composed of a needle valve and a needle valve body. It is characterized in that the cross section of the injection hole is composed of the circular cross section formed by the needle valve and the needle valve body and a plurality of semicircular holes or grooves on the inner cone surface of the top of the needle valve body, which can form an umbrella-porous oil beam composite spray, It not only forms uniform and fine atomization, but also ensures the penetration distance. Since the ring section is equivalent to countless oil holes connected, it can not only promote atomization with a small section, but also have a high oil supply rate, and then use a small needle valve lift. Displacement drive to control the needle valve lift provides an advantage. This special design enables the fuel to be evenly and finely atomized at high and low engine loads. The compound injector provides a key component for further improving the engine's acceleration, economy and emissions performance.

Description

technical field [0001] The invention belongs to a fuel injection device for an internal combustion engine fuel system, and more specifically relates to a composite fuel injector with micro-displacement and uniform atomization. Background technique [0002] The combustion process of the traditional direct injection diesel engine includes both premixed combustion and diffusion combustion, and the diffusion combustion is the main one. In the past hundred years, people have successfully developed different diesel engine combustion systems. By their nature, most systems are diffusion combustion. Due to the extremely uneven formation of the diffusion combustion mixture, there is an insurmountable contradiction between smoke exhaust and NOX. In recent years, with the development of technologies such as electronic control and high-pressure injection, the combustion and emission of diesel engines have been greatly improved, but the essential problem of diffusion combustion still ne...

AI Technical Summary

Problems solved by technology

Umbrella jet combustion has better performance under low load, but it is easy to produce black smoke under high load. Because of the fast fuel supply rate of umbrella jet and small spray penetration distance, it is difficult to control the temporal and spatial distribution of oil and gas under high load.

[0004] In order to promote the formation of a uniform mixture, multiple fine oil hole injectors and high-pressure injection are usually used in the world, but the flow resistance of the oil hole is too small and it is easy to block. If the injection pressure is too high, the energy consumption of the oil pump will increase. High-pressure injection The cost of the system also increases

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