Double-control-valve multi-sealing-tape fuel nozzle

Abstract

The invention provides a double-control-valve multi-sealing-tape fuel nozzle which comprises a nozzle body, a sleeve valve, a needle valve and an adapter seat. The sleeve valve is assembled in the inner cavity of the nozzle body, and the needle valve is assembled in the inner cavity of the sleeve valve. A main spray hole and an auxiliary spray hole are formed in the lower end portion of the nozzle body, the auxiliary spray hole is sealed with the main spray hole by means of an upper sealing tape and a lower sealing tape, and the main spray hole is sealed by means of one sealing tape. Opening and closing of the auxiliary spray hole are controlled by ascending and descending the sleeve valve. Opening and closing of the main spray hole are controlled by ascending and descending the needle valve. The double-control-valve multi-sealing-tape fuel nozzle has the advantages that the double-control-valve multi-sealing-tape fuel nozzle can be applied to a fuel supply system consisting of in-line arranged fuel injection pumps or simple pumps, the nozzle area is controlled through fuel pressures of the pumps, accordingly a slowly first and faster afterwards or stepped fuel injection law is achieved finally, and fuel atomization effect under low injection pressure is improved.

Description

technical field [0001] The invention belongs to the technical field of engine fuel injection systems, in particular to a fuel nozzle with double control valves and multiple seals. Background technique [0002] In order to meet the requirements of the engine emission regulations and improve the economy and controllability, the requirements for the flexibility of the injection characteristics of the fuel injection system are getting higher and higher. The purpose is to achieve high-efficiency combustion and clean emissions at all operating points of the engine, and a matching fuel system is required. The fuel can be injected into the cylinder of the engine in a fixed and quantitative manner according to the established fuel injection law, and it can be well mixed with the compressed air in the cylinder after being fully atomized. The matching of the fuel injection law and the ventilation process is the main research approach to improve the combustion performance. However, how ...

AI Technical Summary

Problems solved by technology

[0004] To sum up, it is difficult to control the change of the open flow area and the fuel injection speed of the two groups of nozzle holes at the same time when using a single needle valve to control two groups of nozzle holes.

Moreover, the flow area of ​​the cylindrical seal requires a long needle valve opening displacement to ensure that if the double cone seal of the single needle valve is used, over-positioning phenomenon will occur, which will reduce the sealing reliability

Using two sets of needle valves to control a set of injection holes, the existing technology cannot meet the requirements of variable injection hole area and flexible adjustment of injection rules

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