Marine hydraulic pressurized micro-dynamic electronically controlled fuel injector

Abstract

The invention aims at providing a hydraulic pressurizing type micro-dynamic electric control oil injector for a ship. The hydraulic pressurizing type micro-dynamic electric control oil injector for the ship comprises an oil injector upper body, an electromagnetic valve assembly, an oil injector middle body, a pressurizer assembly, a needle valve mated part and a nozzle. An oil injector lower bodyof the pressurizer assembly is provided with an oil inlet window, a communicating window, a pressurizing window, an oil injection window, an oil return window and a heavy oil inlet window. The pressurizing window communicates with an oil containing groove of the needle valve mated part through a pressurizing oil way of the oil injector lower body, and the oil injection window communicates with a needle valve control cavity through a pressure communicating channel. A pressurizing piston of the pressurizer assembly is provided with a groove, a pressurizing piston annular cavity is formed throughthe groove and the oil injector lower body, and the pressurizing piston annular cavity communicates with a servo oil return way through the oil return window. A limiting pin is installed on the oil injector lower body. The hydraulic pressurizing type micro-dynamic electric control oil injector for the ship is compact in structure and simple in oil way configuration, can use heavy oil, can achieveultrahigh-pressure injection and has a micro-dynamic oil return function.

Description

technical field [0001] The invention relates to a diesel engine, in particular to a diesel engine fuel system. Background technique [0002] As the power machinery with the highest thermal efficiency and the best energy utilization rate known at present, diesel engine becomes cleaner and smarter after adopting electronic control. At present, diesel engines still maintain a dominant position in marine power. The fuel injection system is the heart of the engine. With the people's increasing fuel consumption standards and stricter emission regulations, the necessity of developing and improving the fuel system of diesel engines is self-evident. [0003] The fuel injector is one of the core components of the diesel fuel injection system. Ultra-high pressure fuel injection is more conducive to the atomization and combustion of fuel. Marine diesel engines, especially large marine diesel engines, in order to achieve ultra-high pressure injection, installing a booster device in the...

AI Technical Summary

Problems solved by technology

Ultra-high pressure fuel injection is more conducive to the atomization and combustion of fuel. Marine diesel engines, especially large marine diesel engines, in order to achieve ultra-high pressure injection, installing a booster device in the injector is one of the solutions, but only adding additional The fuel injector of the pressure device will lengthen the structure of the fuel injector and increase the weight a lot

In addition, due to economical considerations, a considerable proportion of marine diesel engines are fueled with heavy oil. For electronically controlled injectors, heavy oil must be effectively isolated from the solenoid valve, and if only an isolation device is added, the injector will The size is further lengthened; moreover, the oil circuit will become more complicated; in addition, some products in vehicle injectors have adopted micro-dynamic oil return technology, which can greatly reduce the dynamic oil return volume and improve the hydraulic efficiency of the injector. Injectors should also actively try to apply this technology

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