Diesel Injector Fuel Injector 095000-6790 Denso Injector for Shangchai 6D114, Sc9dk

The main component of the injector is the nozzle couple, which is installed in the lower part of the injector body, composed of the needle valve and the needle valve body, with a clearance of 0.0015 ~ 0.0035mm. Needle valve sealing cone and needle valve body after grinding each other to form an annular sealing belt, the width is generally 0.25 ~ 0.3mm. The annular clearance between the cylindrical part of the needle valve head and the nozzle of the needle valve body is generally 0.005 ~ 0.025mm. Therefore, nozzle pairs can only be used in pairs and not interchangeable. The nozzle couple is divided into two kinds: hole type and shaft needle type, wherein hole type is divided into single hole type and porous type; Shaft needle type is divided into shaft needle type and throttle type.

Single-hole nozzle is mostly used in 90 series and 95 series diesel engines, such as ZCK22S147, while multi-hole nozzle is mostly used in 135 series, ZH1105W, Jiefang6110A diesel engines, such as ZCK150S435, ZCK154S432, ZCK155S530. At the beginning of injection, the needle valve rises, and the high pressure fuel is ejected from the jet hole. Because the jet hole is small, the injection pressure is higher, and the atomization is better. The perforated nozzle should be used in order to evenly inject the fuel into the combustion chamber. Due to the mutual interference of the injection holes in the oil storage cavity and the strength limitation at the seat surface, most of the use of 4 ~ 5 injection holes. To increase the spray Angle of a single spray hole, the ratio of the length of the spray hole to the diameter of the spray hole should be reduced. If the penetration of the spray is emphasized, the above ratio should be increased. 2.2 There is only one hole at the lower end of the needle valve body of the shaft needle injector, with a general aperture of 1 ~ 3mm.