Integral control ball valve for common rail injector

Abstract

The invention relates to an integral type control ball valve for a common-rail oil sprayer. The integral type control ball valve for the common-rail oil sprayer is low in manufacturing difficulty. The integral type control ball valve for the common-rail oil sprayer comprises an armature, a control rod, a valve body and a ball body. A guide hole, an oil storage groove and an oil outlet orifice which are in through connection are sequentially formed in the valve body from top to bottom, and an oil inlet orifice is further formed in the oil outlet orifice, wherein one end of the oil inlet orifice is communicated with the oil outlet orifice, and the other end of the oil inlet orifice is communicated with the lower end face of the valve body. The armature is arranged at the upper end of the control rod, and the bottom end of the control rod penetrates through the guide hole and stretches into the valve body. A groove structure is arranged at the lower end of the control rod, the ball body is arranged in the groove structure, and the lower end face of the ball body is tightly attached to a conical surface. The integral type control ball valve has the advantages that the machining difficulty is lowered and machining accuracy is improved, the service life of a sealing structure is greatly prolonged, reliability of the sealing structure is greatly improved, and reliability of the oil sprayer is improved.

Description

technical field [0001] The invention relates to a control ball valve of a common rail fuel injector of a common rail fuel injection system of a diesel engine, belonging to the field of electronically controlled fuel oil systems, in particular to an integral control ball valve of a common rail fuel injector. Background technique [0002] figure 1 It is a simplified structural diagram of the existing common rail injector control ball valve, which is composed of armature 1, control rod 2, valve body 3, ball seat 4, steel ball 5 and valve seat 6, and the valve seat 6 is processed with an oil inlet joint Orifice 7 and oil outlet orifice 8 and high-precision conical surface 9, positioning pin 10, oil storage tank 3-4, oil drain hole A3-5. The positioning pin 10 is used for positioning with the fuel injector body, so that the oil inlet orifice 7 is connected with the high-pressure oil passage. [0003] Since the control valve controls high-pressure fuel oil up to 160-220MPa, the ...

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Problems solved by technology

[0003] Since the control valve controls high-pressure fuel oil up to 160-220MPa, the valve body 3, the control rod 2, and the cone surface 9 are all high-precision parts, and the upper and lower end surfaces of the valve seat 6 are required to be sealed, and the upper end surface is a high-precision surface, which requires high processing. , it is necessary to ensure that the parallelism of the upper and lower end surfaces of the valve seat 6 is 0.005mm, the flatness is 0.0009mm, and the roughness is Ra0.05. According to this process standard, domestically processed parts have high cost and low pass rate, and the injector is disassembled every time After all, the high-precision surface of the upper end of the valve seat 6 must be repaired before assembly

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