Marine diesel engine exhaust valve with adjustable buffering device and control method thereof

Abstract

The invention aims to provide a marine diesel engine exhaust valve with an adjustable buffering device and a control method thereof. The marine diesel engine exhaust valve comprises an exhaust valve shell, an exhaust valve seat, an exhaust valve rod, a buffering piston and a driving piston, wherein a buffering cavity cover is fixed at the upper end of the exhaust valve shell; the exhaust valve seat is located below the exhaust valve shell; the buffering piston, the driving piston and the exhaust valve rod are sequentially connected from top to bottom; the buffering piston and the driving piston are located in the exhaust valve shell; the exhaust valve rod extends out of the exhaust valve shell; an exhaust valve disc at the end of the exhaust valve rod is matched with the exhaust valve seat; a shell protrusion is arranged on the upper part in the exhaust valve shell; and a resetting device is mounted on the lower part in the exhaust valve shell. Compared with the prior art, the requirements on a sensor are reduced; meanwhile, the influence on the sensor is reduced; the signal accuracy is improved; and the mounting cost is reduced.

Description

technical field [0001] The invention relates to an exhaust valve and a control method, in particular to an exhaust valve and a control method of a marine two-stroke diesel engine. Background technique [0002] As one of the core components of a diesel engine, the exhaust valve of a marine two-stroke diesel engine has problems such as poor opening and closing speed due to its large volume and mass, which often leads to a decrease in the quality of air exchange of the diesel engine, which in turn affects the cylinder. The internal combustion process will eventually make the economy and emissions of the diesel engine worse. [0003] At present, most of the exhaust valves of marine two-stroke diesel engines use solenoid valves to control hydraulic oil to push the driving piston to drive the exhaust valve rod down to realize the opening of the exhaust valves, and use hydraulic drive or air springs to realize the closure of the exhaust valves. In the exhaust valve of this type of...

AI Technical Summary

Problems solved by technology

In the exhaust valve of this type of marine two-stroke diesel engine, the improvement of the response speed to the opening and closing of the exhaust valve depends on increasing the pressure of the hydraulic oil and upgrading the solenoid valve, but at the same time it will face the problem of opening and closing the exhaust valve. At the end of the closing stage, the impact force of each component increases, which may easily lead to damage to the components, so it is often necessary to add additional buffer devices, which is very costly

[0004] After the exhaust valve of a marine two-stroke diesel engine runs for a period of time, factors such as thermal expansion, wear, and carbon deposits will cause problems such as increased operating resistance of the exhaust valve, which will lead to a lag in the opening and closing of the exhaust valve, which will affect the quality of the diesel engine's ventilation and The combustion quality will be adversely affected, and in severe cases, it will even cause damage to the exhaust valve of the diesel engine

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