Oil coke slurry ejector for compression ignition engine

Abstract

The invention discloses an oil coke slurry ejector for a compression ignition engine, which comprises an ejector body, a lubricating oil inlet port, a lubricating oil outlet port, a needle valve body and a needle valve, wherein the two sides of both the ejector body and the needle valve body are symmetrically distributed with lubricating oil passages, the needle valve is inserted into the needle valve body and a lubricating oil cavity is preserved in the needle valve body; the pressure-bearing surface of the needle valve is an annular surface, micro solid particles accumulated in a gentle area in an oil tank cannot contact the annular pressure-bearing surface of the needle valve easily and therefore high-pressure oil coke slurry can act on the needle valve smoothly; and the front end of the needle valve is a sealing conical surface and the tip of the most front part of the sealing conical surface is inserted into an ejection hole to increase the clearance in the ejection hole. When the ejector works, a small part of oil coke slurry in the oil tank flows into the lubricating cavity from a clearance between the needle valve body and the needle valve, then flows back to a lubricating oil storage after being carried out by the constantly circulating lubricating oil and finally flows into the lubricating oil again after sedimentation and filtration. Thus, the needle valve moves smoothly, the service life of the needle valve is prolonged effectively, and the rate of failure occurrence is reduced.

Description

technical field [0001] The invention relates to the field of internal combustion engines, in particular to an oil tar slurry injector for compression ignition internal combustion engines. Background technique [0002] my country's oil reserves are only 8% of the world's average per capita, and about 50% of the current annual crude oil needs depend on overseas imports. By 2020, this figure will reach 65%. In order to optimize my country's fuel structure and reduce dependence on imported fuel oil, research on new alternative fuels has received unprecedented attention, and various possible approaches are being actively explored. Oil coke slurry is the final by-product of petroleum refining. Petroleum coke is crushed into tiny solid particles, mixed with a certain proportion of diesel oil, and then added with some active ingredients. Through a certain process, it is prepared into a new type of fuel similar to fuel oil. It is used as a compression ignition internal combustion eng...

AI Technical Summary

Problems solved by technology

The main reason is that there are a large number of tiny solid particles of petroleum coke in the oil coke slurry, which can easily fill the gap between the needle valve coupling parts of the traditional axial needle injector, making the spray effect worse, making it difficult for the needle valve to move, and causing the internal combustion engine to work rough. even auto shut off

The high-pressure oil coke slurry delivered by the high-pressure oil pump enters the oil tank in the needle valve body, and is sprayed into the combustion chamber through the nozzle hole, but a small part enters the matching surface through the matching gap between the needle valve and the needle valve body, resulting in a small gap on the matching surface. The accumulation of more and more solid particles increases the frictional resistance between the originally smooth needle valve and the needle valve body, making it difficult for the needle valve to move

In addition, when the high-pressure oil coke slurry reaches a relatively gentle place in the oil tank of the needle valve body, the tiny solid particles in the oil coke slurry will precipitate and accumulate. As the accumulation increases, they will finally adhere to the traditional pintle injector. The pressure surface of the needle valve cone ring, the high-pressure oil coke slurry does not reach the pressure surface of the needle valve cone ring, resulting in the needle valve not opening

The annular gap between the needle and the nozzle hole of the needle valve head of the traditional needle injector is very small. When the high-pressure oil coke slurry passes through, tiny solid particles will also accumulate in the gap, resulting in poor spray atomization and even dripping. Oil phenomenon that makes the internal combustion engine work rough

Images