A needle valve coupling of a common rail fuel injector
A common rail injector and needle valve technology, which is applied to engine components, fuel injection devices, machines/engines, etc., can solve the problem of inability to effectively suppress injectors, limit application scenarios, and inability to improve injector flow coefficients for fuel injection. In order to reduce the cavitation effect, increase the fuel injection quantity, and realize the effect of dynamic compensation
Active Publication Date: 2022-04-15
FAW JIEFANG AUTOMOTIVE CO
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Although the above method can reduce the flow loss to a certain extent, it is difficult to meet the actual needs of specific engineering applications, which limits the actual application scenarios
In addition, the generation of cavitation inside the fuel injector cannot be effectively suppressed, so the flow coefficient of the fuel injector cannot be improved to improve the injection performance of the fuel injector
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0021] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.
[0022] Let me explain in advance that the cavitation phenomenon is the process of the formation, development and collapse of vapor or gas cavities inside the liquid or on the liquid-solid interface when the local pressure in the liquid decreases. Due to the large pressure drop at the fuel injection hole of the traditional fuel injector, it is easy to cause cavitation. After the fuel injector is impacted by cavitation during the fuel injection process, the surface will be deformed and the material will be eroded, which will reduce the fuel injector. The flow coefficient affects the fuel injection characteristics, stability and service life of the fuel inj...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a needle valve coupling part of a common rail fuel injector, which belongs to the technical field of fuel injection systems. The needle valve coupling of the common rail injector includes a needle valve, a needle valve body and an elastic module. The needle valve is located in the needle valve body, and a pressure chamber is formed between the inside of the needle valve body and the bottom of the needle valve. The bottom of the needle valve body There are multiple oil injection holes, and the multiple oil injection holes are arranged along the circumferential direction of the pressure chamber. The elastic module is arranged at the bottom of the needle valve, and there are multiple oil outlet holes distributed along the circumferential direction around the elastic module. , there is a high-pressure oil passage in the needle valve, the outlet of the high-pressure oil passage is connected with multiple oil outlets, a ball valve is arranged between the elastic module and the outlet of the high-pressure oil passage, and the ball valve controls the communication through the fuel pressure in the high-pressure oil passage. or closed. During the lifting process of the needle valve, the dynamic compensation of the fuel injection flow can be realized, so that the fuel injection quantity per unit time can be increased, and the cavitation phenomenon inside the fuel nozzle can be reduced at the same time. service life.
Description
technical field [0001] The invention relates to the technical field of fuel injection systems, in particular to a needle valve couple of a common rail fuel injector. Background technique [0002] In the traditional high-pressure common rail injector, the needle valve coupling is the most critical structural component in the entire oil supply system. When high-pressure fuel flows into the fuel injector from the pressure chamber of the needle valve body, due to the sharp change in the cross-sectional area of the fuel flow and the flow direction, the fuel pressure drops sharply, resulting in serious cavitation on the upper surface of the fuel injector, which will occur over time. Surface cavitation shortens the service life of the injector itself and seriously affects the injection characteristics, working stability and safety of the injector. As the injection pressure of the common rail system continues to increase, when the fuel flows through the cone surface of the needle...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): F02M61/10F02M61/18F02M61/16F02M63/00
CPCF02M61/10F02M61/1833F02M61/1813F02M61/16F02M63/0028F02M63/0031
Inventor 张涛乔信起孙春华徐光平王华
Owner FAW JIEFANG AUTOMOTIVE CO