Constant pressure oil outlet valve

Abstract

The invention relates to the manufacturing technology of a single cylinder high speed diesel engine with a small cylinder diameter, in particular to a constant pressure oil outlet valve suitable for a diesel engine fuel oil system. The constant pressure oil outlet valve comprises an oil outlet valve tightening seat, an oil outlet valve spring, an oil outlet valve core, an oil outlet valve seat, a steel ball, a spring seat and a pressure relief valve spring, wherein the oil outlet valve spring, the oil outlet valve core and the oil outlet valve seat are mounted in the oil outlet valve tightening seat, the steel ball, the spring seat and the pressure relief valve spring are sequentially assembled in the oil outlet valve tightening seat, the oil outlet valve tightening seat is provided with a lift-range limiting cavity capable of controlling the lift-range of the oil outlet valve, the oil outlet valve core and the oil outlet valve seat are tangentially matched to form a one-way oil supply valve, the oil outlet valve core and the steel ball are tangentially matched to form a constant pressure relief valve, and the lift-range limiting cavity can influence the throttle flow and the initial pressure of the fuel oil in the oil outlet valve through controlling the jumping height of the oil outlet valve core. The constant pressure oil outlet valve has the functions of limiting the lift-range and relieving pressure, can eliminate the secondary injection, the unstable injection generated easily due to low speed and the cavitation erosion easily occurring to a high pressure chamber, and the like, and has the characteristics of simple structure, skillful process, favorable performance, low fuel oil consumption rate, low discharge, stable injection, an the like.

Description

technical field [0001] The invention relates to a mechanical product, in particular to the manufacturing technology of a single-cylinder small-bore high-speed diesel engine, in particular to an equal-pressure oil outlet valve suitable for the fuel system of the diesel engine. Background technique [0002] The oil outlet valve assembly of the single-cylinder high-speed diesel engine fuel injection pump involved in the prior art has a structure including an oil outlet valve tight seat, an oil outlet valve spring, an oil outlet valve core, and an oil outlet valve seat; it is suitable for single-cylinder small-bore high-speed Diesel engines, with the development of diesel engines, the strengthening and strict restrictions on emissions require the fuel supply system to provide higher injection pressure and fuel injection rate. The traditional equal-volume oil outlet valve is prone to secondary injection at high speed and low speed. Unstable injection and cavitation in the high-pr...

AI Technical Summary

Problems solved by technology

The oil outlet valve body, the oil outlet valve seat, the oil outlet valve spring and the reducing container form a first one-way valve, and a second one-way valve opposite to the first one-way valve is installed in the inner cavity of the oil outlet valve body , this kind of fuel delivery valve utilizes the pressure reducing container installed on the top of the inner cavity to realize the change of the internal volume of the fuel delivery valve to control the fuel pressure. It can also prevent the bad injection of the fuel injector and improve the regularity of fuel, but its structure is complex and the parts The sensitivity of action coordination is not high, and the throttling at the flow section of the oil delivery valve and the initial pressure of the fuel cannot be effectively controlled, so it is not ideal and perfect

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