High-pressure common rail oil atomizer

Abstract

The invention discloses a high-pressure oil atomizer used for a high-pressure common rail electric control fuel spraying system. An oil atomizer body component, an oil atomization nozzle component, anelectromagnetic valve component and the like are included. A control valve assembly of the high-pressure oil atomizer is composed of a hole plate and a ball valve. The hole plate is arranged betweenthe oil atomization nozzle component and an oil atomizer body, and the ball valve and an armature component are connected through a control rod. The upper end face of a needle valve is arranged in a control cavity, the needle valve is full of high-pressure fuel, and the static leakage amount of an oil atomization nozzle couple part can be greatly reduced. A needle valve spring is arranged in the control cavity and arranged on the upper end face of the needle valve, and meanwhile the lift of the needle valve is only controlled through the depth size of a hole plate limiting structure. Comparedwith a traditional oil atomizer, the start speed of the electric control oil atomizer can be reduced, the closing response speed is increased, the discharge performance is improved, a needle valve lift adjusting gasket can be eliminated, and the product production cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of fuel injection pumps, in particular to a high-pressure common-rail fuel injector of a high-pressure common-rail fuel injection system for an automobile diesel engine. Background technique [0002] Under the control of the electronic control system, it is an important device of the high-pressure common rail system to inject diesel oil to the diesel cylinder at a fixed time, quantity, and pressure, and to drive the fuel injector for the normal operation of the diesel engine. However, similar products sold in the market have the following problems : [0003] First of all, the maximum stroke size of the needle valve is the assembly size jointly formed by the needle valve, needle valve body, control piston, piston sleeve, and injector body. When measuring the actual size and then using graded adjustment washers to adjust the maximum stroke of the needle valve, resulting in high manufacturing and assembly cost...

AI Technical Summary

Problems solved by technology

[0003] First of all, the maximum stroke size of the needle valve is the assembly size formed by the needle valve, needle valve body, control piston, piston sleeve, fuel injector body, etc. The cumulative tolerance of the size is difficult to meet the accuracy requirements of the needle valve stroke control. When measuring the actual size and then using graded adjustment washers to adjust the maximum stroke of the needle valve, resulting in high manufacturing and assembly costs

[0004] Secondly, the two ends of the matching section of the needle valve and the needle valve body are respectively in the high-pressure area and the low-pressure area, and the high-pressure diesel oil will leak through the matching gap between the needle valve and the needle valve body, resulting in energy loss

[0005] Then, because the control chamber and the needle valve spring are located at the upper end of the control rod, when the fuel injector is closed, the needle valve spring needs to drive the needle valve and the control rod to close at the same time, and the moment of inertia is large, resulting in a long delay for the needle valve to close.

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