Marine low-speed machine electrically-controlled monolithic high-pressure oil pump

Abstract

The scheme provides a marine low-speed machine electrically-controlled monolithic high-pressure oil pump so that improving the fed oil throttling stability and fed oil pressure stability of the high-pressure oil pump can be achieved. The marine low-speed machine electrically-controlled monolithic high-pressure oil pump comprises a pump body, a pump cover, an oil feeding and discharging valve assembly, a plunger and barrel assembly, a plunger spring, a lower spring assembly, a guide piston assembly and an electrically-controlled proportional valve; the oil feeding and discharging valve assemblycomprises an oil feeding valve assembly and an oil discharging valve assembly; the oil feeding valve assembly comprises an oil feeding valve sat, an oil feeding valve and an oil feeding valve spring;the oil discharging valve assembly comprises an oil discharging valve seat, an oil discharging valve, an oil discharging valve spring and an oil discharging valve spring seat; a high-pressure oil discharging cavity is formed between the oil discharging valve seat and the oil feeding valve seat; a high-pressure oil cavity is formed in the plunger and barrel assembly and communicates with the high-pressure oil discharging cavity through an oil hole formed in the oil feeding valve seat; the electrically-controlled proportional valve communicates with an oil feeding hole of the oil feeding valveseat through an oil hole of a pump body, and the oil feeding hole communicates with or is disconnected from the high-pressure oil cavity; and the electrically-controlled proportional valve is providedwith a cooling circulating oil channel, the cooling circulating oil channel communicates with a cooling oil channel of the pump body, and cooling circulating oil can cool proportional valve armaturesor coils.

Description

technical field [0001] The invention relates to the field of low-speed marine high-pressure oil pumps, in particular to a marine low-speed electromechanical control unit high-pressure oil pump. Background technique [0002] With the increasingly stringent emission regulations at home and abroad, marine low-speed diesel engines have put forward higher requirements for fuel injection systems, and the electronically controlled common rail fuel system can realize precise control of fuel injection timing and cycle fuel injection volume, which is a high-power marine diesel engine. One of the effective means of high fuel economy and low harmful emissions. Electronically controlled single high-pressure oil pump is widely used as a common form of oil pump in electronically controlled common rail system. Because traditional proportional valves are generally non-cooled structures, which cannot meet the high-temperature and high-viscosity heavy oil use environment of 750Cst, the existi...

AI Technical Summary

Problems solved by technology

Because traditional proportional valves are generally non-cooled structures, which cannot meet the high-temperature and high-viscosity heavy oil use environment of 750Cst, the existing high-pressure oil pumps of low-speed machines are not equipped with proportional valves to improve their working efficiency; The sealing surface is mostly shaped, which is not conducive to the sealing of high temperature and high pressure heavy oil, the reliability is poor, and the processing difficulty is relatively large

Existing heavy oil high-pressure oil pump plunger couple leaks heavy oil and discharges it into the upper spring chamber of the guide piston for collection. The modified design increases the total height of the spring chamber, and at the same time makes the spring exposed to heavy oil and is easy to corrode

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