Fuel injector for high-pressure common rail fuel injection system
A fuel injection system and high-pressure fuel injection technology, which is applied to fuel injection devices, charging systems, machines/engines, etc., can solve the problems of difficulty in guaranteeing the reliability of ball valves, increasing manufacturing difficulties, and process costs.
Active Publication Date: 2017-05-03
NANYUE FUEL INJECTION SYST CO LTD
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Problems solved by technology
However, with the increase of injection pressure, it is difficult to guarantee the reliability of the ball valve under the existing technology level and mechanical processing equipment of domestic fuel system manufacturers, so this ball valve structure is not suitable for injectors with 2000bar and above
It is also pointed out in the literature that for the improvement of the needle valve couple, various inventions mainly start from reducing the dimensional tolerance accuracy and wear of the parts, so as to reduce the leakage of the couple and achieve the effect of precise control, but it will greatly increase the manufacturing difficulty and process cost.
Method used
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[0045] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.
[0046] see figure 1 , figure 2 and Figure 4 , a high-pressure fuel injector used in a high-pressure common rail fuel injection system shown in the figure is assembled from injector body parts, fuel injection nozzle parts, and electromagnet parts. The specific structure is as follows:
[0047] The fuel injector body component 100 includes a fuel injector body 110 , a slit filter element 120 , an upper insert 130 , a steel ball 140 , a push rod 150 , an adjustment pad 160 , and a lower insert 130 a.
[0048] The injector body 110 is provided with an upper external thread 110a, an oil inlet hole 110b, and a lower external thread 110c. The oil hole 110b is disposed in the middle of the injector body 110 .
[0049] In the injector body 110, the...
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The invention discloses a fuel injector for a high-pressure common rail fuel injection system. The fuel injector comprises a fuel injector body part, a fuel injection nozzle part and an electromagnetic valve part. A control valve assembly of the fuel injector is composed of a control valve seat and a control valve element, and a conical angle of an upper conical section of the control valve element is smaller than that of an axial seal conical hole in the control valve seat, so that a balance valve structure is formed, and the response speed of an electric control fuel injector can be greatly increased. An orifice plate is internally provided with a central needle valve inserting hole filled with high-pressure fuel, so that the dynamic leakage rate of a fuel injection nozzle coupled part can be greatly reduced. All the contact surfaces of the fuel injection nozzle coupled part, the orifice plate, the control valve assembly and a fuel injector body are precise surfaces; and compared with the traditional fuel injector, the fuel injector has the advantage that the sealing performance and reliability of the system can be remarkably improved on the basis that the processing difficulty and the process cost are not increased.
Description
technical field [0001] The invention relates to a fuel injector, in particular to a high-pressure fuel injector applied to a high-pressure common rail fuel injection system. Background technique [0002] Electronically controlled high-pressure common rail fuel injection system, as the best choice for diesel engines to meet China III, China IV or higher emission standards, consists of high pressure fuel supply pumps, high pressure fuel rails, electronically controlled fuel injectors, ECU and sensors. In this system, the electronically controlled fuel injector is the most critical and complex part. Its function is to control the opening and closing of the solenoid valve according to the control signal sent by the ECU, and inject the fuel in the high-pressure fuel rail at an optimal Injection Timing, Injection Quantity, and Injection Rate Inject fuel into the engine combustion chamber. A typical high-pressure common rail injector is composed of an injector, a control piston, a...
Claims
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IPC IPC(8): F02M51/06F02M61/10F02M61/16
CPCF02M51/0614F02M61/10F02M61/16
Inventor 龙美彪欧阳玲湘黄民备邓飞王英姿谭四喜
Owner NANYUE FUEL INJECTION SYST CO LTD