Diesel Injector Fuel Injector 0445120387 compatible with Bosch injector

Structural design of accumulator fuel injector

The accumulator cavity includes the accumulator orifice and the accumulator cavity. The throttle hole is located at the population of the accumulator cavity, which produces a strong throttling effect in the process of oil injection, inhibits the pressure fluctuation produced by the injector to spread to the system, and also reduces the influence of pressure fluctuation produced by other injectors on the injector. The accumulator chamber is located at the head of the injector, which is mainly used to prepare for the injection of fuel by the injector. It plays a accumulator role and absorbs the pressure fluctuation caused by the opening and closing of the needle valve in the injector, which is conducive to the accurate control of injection. During fuel injection, the fuel quantity of the injector only needs to be supplemented after each injection. Therefore, the pressure drop and peak pressure in the nozzle at the end of injection can be kept within the specified range by designing the accumulator chamber with appropriate volume, which can realize the precise control of the injection quantity of the nozzle each time and thus achieve the purpose of reducing the uneven injection quantity of each cylinder.

(1) The cross-sectional area of the orifice of the accumulator and the volume of the accumulator have a great influence on the flow characteristics of the accumulator injector nozzle.

(2) With the increase of the orifice area, the volume fraction of gas in the orifice increases and the cavitation effect is enhanced; The fuel flow rate decreases and the outlet flow decreases.

(3) When the volume of the accumulator chamber increases, the cavitation effect is enhanced, and the volume of fuel bubbles in the hole becomes larger; The high-speed fuel occupies most of the space in the hole, and the speed of the fuel downstream of the hole is gradually decreasing, and its change trend is not as obvious as the volume fraction.