An electronically controlled common rail heavy oil injector

Abstract

The electronically controlled common rail heavy oil injector disclosed by the invention comprises: an injector body, an electro-hydraulic control component, and a nozzle component. In the electro-hydraulic control component, there is a ring groove in the middle of the outer side of the guide sleeve. The middle part of the groove has a horizontal through hole leading directly to the middle hole of the guide sleeve. There are sealing rings on both sides of the ring groove, which divides the interior of the injector into three chambers. Three ring grooves are formed on the guide section of the control valve core, and the second ring groove communicates with the transverse through hole in the middle of the guide sleeve. The electromagnetic components are in contact with the cooling oil, and the cooling oil circuit is isolated from the fuel oil circuit through dynamic sealing, static sealing and drainage, which can effectively avoid the corrosion and thermal damage of the electronic components by heavy oil; The guide sleeve of the ball valve seat can be inserted into the sinking groove of the measuring orifice plate, and cooperate with the ball valve seat in clearance, and has a certain guiding ability for the axial movement of the ball valve seat.

Description

technical field [0001] The invention relates to a high-pressure common rail engine, in particular to an electronically controlled common rail fuel injector. Background technique [0002] As the transportation costs of shipping companies continue to rise, engines that use heavy oil (combustible with low-quality fuel) as fuel have unique advantages in cost reduction. Due to its many impurities, heavy oil is corrosive to parts and prone to stickiness. It is also corrosive to electronic components. At the same time, heavy oil is viscous and requires high temperature heating when used. Excessive oil temperature will shorten the life of electronic components. . How to improve this problem is an important hot spot to improve the service life of heavy oil diesel engines. [0003] The low-speed diesel engine in the prior art requires hydraulic drive for its exhaust valve control, and it is designed with a servo oil channel specially designed to transport the driving oil. Therefore,...

AI Technical Summary

Problems solved by technology

The application of servo oil prevents heavy oil and electronic components from contacting each other. However, the pressure of servo oil is much lower than that of fuel oil. The volume of the pressurized structure inside the servo oil driver is large, so that the external servo oil driver occupies a relatively large space, and the space layout is difficult.

Therefore, multiple fuel injectors on the same cylinder can often only share one servo oil driver, resulting in the fuel injection between the fuel injectors being unable to be independent of each other and interference

At the same time, the movement of the exhaust valve causes the servo oil pressure to fluctuate, which in turn affects the working response of the servo oil driver and indirectly affects the consistency of each injection of the injector.

In addition, the servo oil driver needs to be arranged far away from the injector due to its large volume, causing a large delay in control

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