Diesel Injector Fuel Injector 095000-8621 Denso Injector for Mitsubishi, Toyota

The shaft needle of the needle valve head is inserted into the nozzle of the needle valve body to form an annular clearance. Shaft needle lift, shape can determine the size of the spray hole section, spray Angle. Due to the large orifice of the nozzle and the frequent reciprocating movement of the shaft needle, the nozzle has the ability of self-cleaning and is not easy to accumulate carbon clogging. Now take ZS15S15 injector as an example, its technical specifications are shown in Table 1. At the beginning of oil injection, the lift valve rises, and the high pressure fuel is ejected through the annular gap between the jet hole and the shaft needle, hitting the inverted cone part of the shaft needle, forming the required Angle of the fog cone. ZS15S15 nozzle couple because the annular clearance is relatively large, so at the beginning of injection due to the small throttling effect, the injection of high pressure fuel. As the needle valve continues to rise, the inverted cone part of the shaft needle gradually enters the jet hole, so that the annular clearance is gradually reduced, the throttle of the shaft needle is constantly increased, and the high pressure fuel injection is gradually reduced.

In terms of structure, it is similar to the shaft needle nozzle, the difference is that the nozzle wall of the needle valve body is thicker, and the nozzle part of the needle valve is longer. Take ZS4S1 injector as an example. Injection begins, the needle valve rises, and the high pressure fuel is sprayed through the annular gap between the cylinder part of the shaft needle and the nozzle.