a control valve
A technology for controlling valve and valve seat, applied in engine components, machines/engines, charging systems, etc., can solve the problems of difficult processing technology and poor reliability, and achieve fast opening and closing response, good sealing and reliability. Good results
Active Publication Date: 2016-02-24
CHINA FAW LIMITED WUXI FUEL INJECTIONEQUIP RES INST +1
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Problems solved by technology
However, in the actual application of this kind of valve, due to structural problems, there are problems such as difficult processing technology or poor reliability.
Method used
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Embodiment Construction
[0018] Such as figure 1 As shown, a control valve for high-pressure common rail fuel system, including solenoid valve cap 1, injector body 2, solenoid spring 3, solenoid valve 4, armature (control valve) 5, control valve seat 6, Oil passage II7, oil outlet hole 8, oil passage III9, high pressure oil inlet passage 10, oil inlet hole 11, adjustment ring 12, damping sleeve 13, damping spring 14, oil passage I15, control chamber 16, control piston 17. The armature 5 is used as a control valve, and its lower end has a conical surface that cooperates with the conical surface on the upper part of the control valve seat 6 to form a conical valve structure. The armature 5 is a "T"-shaped hollow structure; the head of the control valve seat 6 has a valve core, its conical surface is located below the valve core, and the control valve seat 6 also has an oil outlet hole 8 connected to the control valve seat. High-pressure oil passage III9, oil passage II7, and oil passage I15; the armatu...
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The invention discloses a control valve. The control valve is used for a high-pressure common-rail fuel system. The control valve comprises an electromagnet, an electromagnet spring, an armature and a control valve seat. The control valve is characterized in that the armature serves as a control valve body, a conical surface valve structure is formed by a conical surface arranged at the lower end of the armature and a conical surface on the top of the control valve seat in a cooperative mode, and is used for having control over circulation of fuel oil in a high-pressure oil duct formed in the control valve seat, and the high-pressure oil duct is communicated with a control cavity in the lower end face of the control valve seat. The control valve is simple in structure; when the control valve is in a stationary state, the armature, namely the control valve body, does not bear hydraulic pressure, and thus the needed pretightening force of a solenoid valve spring can be quite small; due to the fact that the design of a conical surface valve is adopted, the control valve can adapt to the high-pressure common-rail system, a needle valve can be high in response speed of opening and closing, and the capacity of multiple oil ejection is improved; leakproofness is good, impact of the armature, namely the control valve body, on the control valve seat is low, and reliability is high.
Description
technical field [0001] The invention relates to a control valve in an ultra-high pressure common rail fuel system. Background technique [0002] As the requirements for energy saving and emission reduction become higher and higher, the injection pressure corresponding to the fuel system is also continuously increasing. The most advanced fuel system today is represented by the common rail system, so the rail pressure is required to be continuously increased to meet the Euro 5 emission requirements. The pressure is 220-250MPa, while Euro 6 emissions require a pressure of 250-300MPa, and the number of injections per cycle of the common rail system is also required to increase. [0003] The control valves in the common rail system can be divided into two categories, namely pressure balanced valves and unbalanced valves. The pressure balance valve means that the valve is in a static state, and the resultant force of the hydraulic pressure has no effect on it in the direction of ...
Claims
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IPC IPC(8): F02M61/10
Inventor 缪雪龙刘敏郭立新周望静夏兴兰居钰生
Owner CHINA FAW LIMITED WUXI FUEL INJECTIONEQUIP RES INST