Double-fuel fuel injector

Abstract

The invention discloses a double-fuel fuel injector. The double-fuel fuel injector comprises a shell body, a main valve core, a first fuel channel, a second fuel channel, an auxiliary valve core and a rotating trough, wherein the main valve core is arranged in the shell body and can move in the axial direction of the shell body, a ring-shaped pressure storing cavity is defined by the main valve core and the bottom of the shell body, the first fuel channel is arranged in the center of the interior of the main valve core, the upper end face of the first fuel channel is bent towards the shell body, the lower end of the first fuel channel is gradually contracted to form a throat pipe, the lower end of the throat pipe forms a diffusion cavity, first nozzles are evenly formed in the lower end of the diffusion cavity, the second fuel channel is arranged the lower end, close to the shell body, of the interior of the main valve core and communicates with the ring-shaped pressure storing cavity, the auxiliary valve core is arranged in the bent position on the upper portion of the first fuel channel in the main valve core and can move in the radial direction of the shell body, the periphery of the rotating trough is arranged on the inner wall of the lower end of the shell body, and the rotating trough communicates with the throat pipe. The double-fuel fuel injector can be installed on a cylinder cover of an engine in integration and intensification modes, and single-fuel injecting, double-fuel mixed injecting and double-fuel independent injecting are conducted.

Description

technical field [0001] The invention relates to the technical field of engine high-pressure fuel injection, and more specifically, the invention relates to a dual-fuel injector. Background technique [0002] The fuel injector is a common precision coupling in the engine. On the one hand, with the gradual popularization of petroleum alternative fuels, more and more engines begin to use gaseous fuels as alternative fuels for engines. On the other hand, engines using dual fuel combustion have great advantages over single fuel engines in terms of power, economy and emissions. However, although gasoline and diesel injectors can be directly used to inject high-pressure gas fuel, due to differences in the viscosity and density of gas-liquid fuels, long-term use of gasoline and diesel injectors to inject gas fuel may easily cause dry friction and shorten the life of the injector . In addition, limited by the layout capability of the engine cylinder head, it is difficult to compac...

AI Technical Summary

Problems solved by technology

However, although gasoline and diesel injectors can be directly used to inject high-pressure gas fuel, due to the difference in viscosity and density of gas-liquid fuels, long-term use of gasoline and diesel injectors to inject gas fuel may easily cause dry friction and shorten the life of the injector

In addition, limited by the layout capability of the engine cylinder head, it is difficult to compactly arrange the dual independent injectors on the cylinder head

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