Oil sprayer

Abstract

The invention discloses an oil sprayer which comprises a valve rod, a ball head and an oil sprayer component for controlling the valve rod to axially move between an opening position and a closing position, wherein a valve seat is arranged on the outer side of the ball head, and comprises a valve wall and a spraying base, which are integrated; a needle valve body is arranged on the outer side of the valve wall; the valve wall is provided with an annular inner surface for the axial movement of the ball head; a plurality of nozzle holes are formed in the spraying base; a sealing surface capable of sealing all the nozzle holes is arranged between the inner lateral surface of the spraying base and the bottom of the ball head; the valve wall is circumferentially and uniformly provided with a plurality of radially through straight slots. With the adoption of such a structure, the spraying performance of a direct oil sprayer in a gasoline cylinder can be achieved; meanwhile, an outer fuel passage and the straight slots are formed, so that high flowing property of a fuel can be achieved, and the inner and outer surfaces of the valve seat are wetted by the fuel all the time to achieve lower temperature of the valve seat and reduce the remaining or curing of the fuel in the vicinity of the nozzle holes of the oil sprayer.

Description

technical field [0001] The invention relates to a fuel injection system used in an automobile internal combustion engine, in particular to a fuel injector. Background technique [0002] Fuel is ejected from the nozzle hole of the injector, and a certain amount of fuel adheres around the nozzle hole. These residual fuels are solidified by the heating of the surrounding environment, accumulate around the nozzle and even block the nozzle hole, the spray direction of the fuel sprayed through the nozzle hole and the shape of the fuel spray may change, thereby affecting the injection characteristics of the injector, eventually causing The engine experienced sluggish acceleration, jerky idling, and loss of power. Therefore, it is necessary to prevent fuel residue or solidification as much as possible, so as to realize the ideal injection characteristics of the injector. [0003] In order to prevent the fuel injected by the injector from remaining around the nozzle hole, most of t...

AI Technical Summary

Problems solved by technology

However, on the one hand, the angular position of the above-mentioned lateral through holes may affect the flow of fuel at the head of the valve seat, and the structure is more complicated, which increases the difficulty of processing

On the other hand, there is no vertical passage of fuel inside the guide, the cooling effect of the guide is poor, the heat dissipation is slow, and there is still fuel residue near the nozzle hole

At the same time, the structural design of the guide also brings another problem. Since the oil passage between the guide and the injector housing is the main oil passage of the fuel, the wall thickness of the guide is relatively thin, and the guide The guiding part of the guide part is relatively short. When the guide part and the shell are welded and assembled, the contact part between the guide part and the shell is prone to thermal deformation, and even the deformation of the ball head of the guide part will be caused, which will cause oil injection. The device works unstable

Images