Dual-fuel injector

Abstract

The invention relates to a dual-fuel injector which comprises an injector body, a first injector body pipeline, a second injector body pipeline, a third injector body pipeline and a fourth injector body pipeline are vertically arranged in the middle of the injector body, and a control valve component is placed at the upper end of the second injector body pipeline and the upper end of the third injector body pipeline. The upper end of the injector body first pipeline communicates with a first fuel rail, and the upper end of the injector body fourth pipeline communicates with a second fuel rail; the lower portion of the ejector body is sleeved with a nozzle tightening cap in a threaded mode, a middle body and a valve body are fixedly installed in the nozzle tightening cap from top to bottom, and the lower end of the valve body extends out of the nozzle tightening cap. The double-control-valve structure is arranged in the same ejector body side by side, the integration degree is higher, the assembly size is smaller, and the double-control-valve structure can be conveniently installed on an engine.

Description

technical field [0001] The invention belongs to the technical field of fuel injectors and relates to dual fuel injectors. Background technique [0002] With the continuous upgrading of national emission regulations, natural gas, as one of the alternative fuels, has developed rapidly in the transportation field in recent years because of its cleanliness and economy, and the sales of gas vehicles have increased year by year. The existing natural gas engines on the market are mainly based on low-pressure manifold injection technology, which injects natural gas into the intake manifold at a pressure lower than 10 bar and ignites it through the spark plug, but its calorific value efficiency is low and the exhaust temperature is high. In order to solve the above problems, the Canadian Westport Innovation Company proposed the HPDI technology, using dual-fuel injectors to directly inject diesel and natural gas into the combustion chamber at a high pressure of 300bar, injecting a sma...

AI Technical Summary

Problems solved by technology

[0003] The control valve structure of the existing dual fuel injector is complicated and the external dimensions are large, which is not conducive to the installation in the engine cylinder head; the movement stroke of the inner needle and the outer needle cannot be adjusted freely; the inner needle and the outer needle are limited by the plane structure , it is easy to generate lateral force, increase the wear of the mating surface of the nozzle assembly, and affect the reliability of the product; the relative position of the two groups of nozzle holes is not limited or the limit is directly set inside the nozzle assembly, which increases the processing difficulty of the nozzle assembly

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