New High Quality Diesel Nozzle DLLA31S921 for Injection Nozzle Diesel Engine Parts

Diesel engines play a key role in many fields due to their high torque and fuel economy advantages. The injector nozzle, as the terminal actuator of fuel delivery, controls fuel atomization and injection rhythm, and its structural precision directly “sculpts” the engine's power output, emission quality and operational stability, so it is very meaningful to explore the structural details in depth.

Needle valve is undoubtedly the core controller of the fuel nozzle, its head conical surface by ultra-precision grinding, surface roughness up to nanometer level, and the valve body sealing seat close to form a near-perfect sealing barrier to prevent the fuel from “running away”. The stem is long and straight, and the gap between the guide holes of the adapted valve body is extremely small, which ensures the needle valve lifting and lowering smoothly and without any obstruction at the microscopic level. Whether it's the initial spraying at the moment of engine startup or the frequent switching of spraying action at high speed, it can be accurately put into place, with the error controlled at the micro-second level, to ensure that the fuel is sprayed on time according to the “instruction”.

The valve body is like a strong fortress, made of aviation-grade high-strength aluminum alloy or heat-resistant alloy steel, with excellent deformation resistance, enough to resist the instantaneous high-pressure impact from the combustion chamber and protect the internal precision components. The internal fuel channel is winding but orderly, the channel wall is electrolytically polished, the roughness is reduced, the fluid resistance is suddenly reduced, the fuel can flow smoothly and at high speed to the needle valve cavity, providing stable “logistic support” for accurate fuel metering and injection, making the fuel injection volume flexible and adjustable according to the needs of complex engine conditions.

Injector holes are the “stage exit” for fuel to transform gorgeously. Small passenger car diesel engines in pursuit of the ultimate fuel economy and low emissions, injection hole diameter of 0.1 - 0.2 mm, centrally symmetrical arrangement, such as the stars, to promote the atomization of fuel into very fine particles, evenly dispersed in the combustion chamber, to achieve soft, efficient combustion. Large construction machinery diesel engine is another way to expand the aperture to 0.3 - 0.5 mm, the number of combustion chamber volume according to the sparsely distributed, with a special asymmetric layout, to ensure that a large amount of fuel can quickly cover the wide combustion space, to meet the demand for heavy-duty working conditions surging power.

The spring injects “vitality” into the needle valve movement, and is wound with high modulus of elasticity and anti-fatigue special steel. The spring stiffness is optimized by repeated simulations, and under idling conditions, it provides just the right amount of weak elasticity to assist the needle valve to finely regulate the fuel injection pulse and maintain smooth engine idling “breathing”; when the high load charge, the elasticity increases steeply and pulls back the needle valve strongly to cut off the fuel flow instantly, preventing the fuel from being over-injected and safeguarding the combustion process. “The combustion process is guaranteed.

Nozzle overall immersion in high temperature, strong corrosion of fuel and gas environment, the material selection is harsh. The main body is made of high-temperature resistant nickel-chromium alloy, with a high-temperature resistance of more than 1000℃, and the surface oxidized layer is continuously self-repairing and erosion-resistant. Key friction parts, such as the needle valve stem and valve body guide, covered with diamond-like coating, superior hardness, coefficient of friction as low as 0.05 or less, greatly reducing wear and prolonging the nozzle “service life”.

Each structural plate is closely linked, and the needle valve body is the precise “commander” of the fuel; the injection hole design is the “catalyst” of the combustion efficiency; the spring mechanics is the “regulator” of the working conditions; and the suitable material is the “regulator” of the working conditions. The spring mechanics is the “regulator” to adapt to the working conditions; and the suitable material is the “guardian shield” for long-lasting operation, which jointly empowers the diesel engine to speed on the runway of power, economy and environmental protection.

Diesel injector nozzle with its marvelous structural complexity and scientific nature, become the hero behind the diesel power. Continuing to dig deeper into the structural potential and fusion of cutting-edge technology will surely push diesel engines towards the peak of higher performance and drive the wave of industrial innovation to roll forward.