A high-speed machine isobaric fuel injection pump

Abstract

The invention relates to an equal-pressure fuel injection pump for a high-speed machine. The fuel injection pump adopts an equal-pressure oil outlet valve structure to avoid secondary injection of the nozzle. The oil outlet valve seat adopts a split type and has a compact structure. The matching lever drives the plunger to rotate to adjust the effective stroke of the pressurized oil supply. Compared with the traditional gear and rack mechanism, its structure is compact, the weakening of the pump body is small, and the processing difficulty is low. The transmission part adopts the guide cylinder assembly , its movement mass is small, the plunger spring adopts double spring parallel connection with opposite rotation direction, compact structure, the large spring ensures the continuous tracking between the transmission part and the cam, and the small spring ensures that the plunger runs to the top dead center and then quickly descends to flush oil. To prepare for the next cycle, the anti-corrosion block installed on the inner wall of the low-pressure chamber of the pump body is used to prevent cavitation, with a simple structure and low processing difficulty.

Description

technical field [0001] The invention relates to a mechanical fuel injection pump, in particular to a constant pressure fuel injection pump for a high-speed machine, and belongs to the technical field of marine engines. Background technique [0002] The fuel injection pump, also known as the high-pressure fuel pump, is the most important part of the fuel injection system and is a key part of the diesel engine. The function of the fuel injection pump is to increase the fuel pressure, and according to the needs of the diesel engine, a certain amount of fuel is sprayed into the combustion chamber through the nozzle in the form of mist within an accurate time, forming a good mixed gas with the air to ensure high-efficiency combustion needs. With the increasingly stringent emission regulations, fuel injection systems are developing towards intelligence and digitalization, but in the field of marine engine technology, mechanical fuel injection systems still occupy an irreplaceable...

AI Technical Summary

Problems solved by technology

The disadvantage is that the gear and rack mechanism takes up a lot of space and weakens the pump body greatly. The quality of the moving parts is relatively large when the guide piston assembly is used, and the manufacturing cost is relatively high when the anti-corrosion screw is used to prevent cavitation.

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