Skip to main content

Construction of Hole Type Fuel Injector for Diesel Generator Set Part 1

The fuel of a diesel engine is injected into the cylinder near the end of the compression process. The function of the fuel injector in a diesel generator set is to atomize the fuel into fine particles and distribute them appropriately in the combustion chamber, forming a good combustible mixture. Therefore, the basic requirements for the fuel injector are: a certain injection pressure, a certain range, a certain spray cone angle, good spray, quick fuel stop at the end of fuel injection, and no fuel dripping.

The hole type fuel injector of diesel generator set is mainly used in direct injection diesel engines. Due to the number of spray holes and small aperture, it can spray several spray columns with small cone angles and longer range. The general number of fuel injection holes is 2-8, with a diameter of 0.15-0.50mm. The number and direction of spray holes depend on the requirements of various combustion chambers for atomization quality and the arrangement of injectors in the combustion chamber. For example, the combustion chamber of the 6135G diesel engine is W-shaped, and the formation of the mixture is mainly achieved by directly injecting fuel into the combustion chamber space, so a 4-hole closed injector is used. The nozzle diameter is 0.35mm, the injection angle is 150 degrees, the needle valve opening pressure is 17.5MPa, and the nozzle shape is suitable for the W-shaped combustion chamber.

The main components of fuel injectors are needle valves and needle valve bodies made of high-quality alloy steel, collectively known as needle valve fittings (also known as fuel injector fittings). The cylindrical surface on the upper part of the needle valve is in high-precision sliding fit with the corresponding inner cylindrical surface of the needle valve body, with a clearance of about 0.001-0.0025mm. This gap must be within the specified range. If the clearance is too large, oil leakage may occur, which will reduce the oil pressure and affect the quality of spray; If the gap is too small, the needle valve cannot slide freely. The conical surface of the lower part of the needle valve is fully exposed in the annular oil chamber of the needle valve body. Its function is to withstand the axial thrust caused by oil pressure and make the needle valve rise, so this conical surface is called the pressure bearing conical surface. The conical surface at the lower end of the needle valve is matched with the corresponding inner conical surface on the needle valve body to achieve sealing of the injector cavity, which is called the sealing conical surface. The cylindrical surface at the top and conical surface at the bottom of the needle valve, along with the corresponding mating surface on the needle valve body, are finely ground and then mutually ground to ensure their mating accuracy. Therefore, the selected and ground needle valve components cannot be interchanged.

As a professional diesel generator manufacturer, we always insist on using first-class talents to build a first-class enterprise, create first-class products, create first-class services, and strive to build a first-class domestic enterprise. If you would like to get more information welcome to contact us via sales@dieselgeneratortech.com.

标签：

Comments

Post a Comment

Popular posts from this blog

Diesel Generator Power Ratings: Standby vs Prime vs Continuous

Diesel generator sets are commonly used in a variety of sectors due to their dependable performance and high efficiency. They can be used for emergency power supply in the event of a power cut or used in places without connection to a power grid. When selecting a diesel generator for your home or business, you need to consider many factors, such as generator’s ratings. In this article, we’ll explain the three basic rating types - standby, prime, and continuous in diesel generators. ISO-8528-1:2018 defines basic generator set rating categories based on four operational categories: Emergency Standby Power (ESP), Prime Power (PRP), Continuous Power (COP) and Limited-Time Running Prime (LTP). Read on and learn the application of power ratings for engines used in generating sets. Standby Power Rating Standby Power(ESP) is used to supply emergency power when the external power supply is interrupted, such as power outages. Standby power rated generators can supply reliable electricity as t...
Post a Comment
Read more

How to Choose a Household Mini Generator

With the improvement of people's living standards, there are more and more household appliances, such as rice cookers, microwaves, kettles, refrigerators, air - conditioners, washing machines, etc. It can be said that every household has them. But what if there is a power outage? These appliances won't work properly, and our lives will be greatly disrupted. How can we avoid this? We can use household mini - generators to provide convenience in power consumption. So, how to choose a good household mini - generator? Consider the noise level Since it is for household use, when choosing a household mini - generator, we need to check whether the noise will affect the neighbors. Generally, the seller will demonstrate the performance of the generator in advance. A good household generator can reduce noise by about 80%. Choose a generator with a moderate price Due to different brands, there are significant differences in power, and consequently, the price differences of househ...
Post a Comment
Read more

How to Choose Efficient Diesel Generators for the Film and Television Industry?

In the film and television industry, the stability of the electricity supply during filming is crucial. Whether the equipment are the cameras or the lighting equipment on the filming site, or the post-production equipment, they all need stable and reliable power support. Unstable or interrupted power can result in interrupted filming, damage to equipment, and even affecting the progress and quality of the entire project. Therefore, investing in high-efficiency diesel generator sets has become an important measure for the film and television industry to ensure the reliable power supply for shooting. Determine the power requirements Before choosing a diesel generator set for the film and television industry, it’s necessary to figure out the total power needs, including the electricity demand of the shooting location, the total power of the electrical equipment and the time of using electricity. Also consider whether there are special needs for the generators such as low noise level and...
Post a Comment
Read more