Pressure balance type inner sealing planar control valve of common-rail oil atomizer

Abstract

The invention relates to a pressure balance type inner sealing planar control valve of a common-rail oil atomizer. The aim of the invention is fulfilled that the pressure balance type inner sealing planar control valve consists of a control valve, a valve core, an armature and a valve seat, wherein a valve block is arranged inside a high-pressure common-rail oil atomizer body; the valve seat is fixed in the high-pressure common-rail oil atomizer body and is fixed above the valve block; the armature is arranged on the upper part of the control valve; a control valve inner hole which is penetrated up and down is formed in the center of the control valve; the valve core is arranged in the control valve inner hole; an external circle of the valve core and an internal circle of the control valve inner hole form a pair of coupled pieces; a valve seat inner hole which is penetrated up and down is formed in the center of the valve seat; the control valve can move up and down in the valve seat inner hole; and a slot is formed in the high-precision plane of the lower end of the control valve, so that the high-precision plane is divided into an internal circle plane and an external circle plane. The pressure balance type inner sealing planar control valve has the advantages of simple structure, simplicity in manufacturing and long service life.

Description

technical field [0001] The invention relates to the field of fuel injection systems for diesel engines, in particular to a pressure-balanced inner sealing plane control valve for common rail injectors. Background technique [0002] At present, the control valves in the high-pressure common rail injectors of BOSCH Company and Denso Company commonly used in my country are ball valves and planar valves (refer to patents CN1664349A, US2010 / 0294242A1). Acting on the ball valve or flat valve, as the injection pressure in the injector increases, for example, from 140MPa to 200MPa, the force of high-pressure fuel acting on the control valve increases by about 70%, and the control of the control valve by the electromagnet becomes more difficult , the time interval between each injection is extended, and the ability of multiple injections is reduced. Therefore, in recent years, many companies have adopted pressure balance control valves, the control stroke is reduced to 0.02-0.03mm, th...

AI Technical Summary

Problems solved by technology

However, the cone valve adopts line seal, that is, the contact line between the seat and the cone surface of the valve core is a line, and the contact stress is very large, so the cone surface of the valve seat and the cone surface of the valve core are very easy to wear after use, and the line seal is changed to surface seal. The sealing effect is reduced, from pressure balance to pressure imbalance, which changes the characteristics of the control valve and affects the performance of the high-pressure common rail injector

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