Pressure accumulator current limiting piezoelectric control injector

Abstract

The invention provides a pressure accumulation flow-limiting type piezoelectric control oil sprayer which comprises an oil sprayer head, an oil sprayer body, a flow limiting component, a piezoelectric control component, a needle valve reset spring, a locating pin, a nozzle, a needle valve, a needle valve limiting block, a valve seat, a tightening cap and a sealing ring. The flow limiting component structure is adopted, the situation that the economical efficiency of fuel oil is reduced due to the fact that the oil sprayer sprays oil abnormally and continuously can be effectively avoided, and work reliability of the oil sprayer is guaranteed. Pressure fluctuation caused in the fuel oil spraying process can be reduced through a pressure accumulation cavity in the oil sprayer body, and oil spraying stability can be controlled precisely. When the pressure accumulation flow-limiting type piezoelectric control oil sprayer is used for a common-rail fuel oil system, the structural size of a common-rail pipe can be reduced, and therefore the strength requirement for common-rail pipe materials is lowered, the service life of the oil sprayer can be prolonged, and the space utilization rate of the oil sprayer can be improved. The needle valve is directly driven by a piezoelectric stack in the movement process, and is high in response speed, control precision is high, the oil spraying rule is flexible and variable, and the dynamic property and economical efficiency of a diesel engine are effectively improved.

Description

technical field [0001] The invention relates to a fuel injector, specifically a diesel fuel injector. Background technique [0002] Traditional mechanically controlled fuel injectors have the main advantages of simple structure and high operational reliability, but because the fuel injection timing, fuel injection pressure and fuel injection rate are restricted by the shape of the high-pressure fuel pump cam, it has slow fuel injection response and poor control of fuel injection. It is difficult to improve the fuel economy and emission characteristics of the engine on the basis of poor measurement accuracy and other deficiencies. Compared with the mechanically controlled injector, the electromagnetically controlled injector used in the diesel engine electronic injection system has faster response speed, flexible and controllable fuel injection characteristics, and more accurate control of the fuel injection quantity. However, it also has the following Disadvantages: The con...

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Problems solved by technology

[0002] Traditional mechanically controlled fuel injectors have the main advantages of simple structure and high operational reliability, but because the fuel injection timing, fuel injection pressure and fuel injection rate are restricted by the shape of the high-pressure fuel pump cam, it has slow fuel injection response and poor control of fuel injection. It is difficult to improve the fuel economy and emission characteristics of the engine on the basis of poor measurement accuracy and other deficiencies

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