Swirl injection valve

摘要

A swirl injection valve includes: a nozzle body including a hollow cylindrical body having a hole and a bottom portion on which a nozzle port and a valve seat are formed; a needle valve member, slidably inserted and reciprocally moved within the hole of the nozzle body, having a tip portion for seating on the valve seat and controlling the opening and closing of the nozzle port; a swirl chamber formed upstream of the nozzle port and defined between an inner wall of the nozzle body and an outer wall of the needle valve member; a fuel supply passage formed within the nozzle body and connected to a fuel supply source; and inclined passage comprising at least one short passage connected to the swirl chamber and the fuel supply passage and tangentially opened to the swirl chamber at a predetermined inclined angle. The fuel is tangentially supplied from the inclined passage to the swirl chamber without pressure loss. Thus the intense swirling flow of the fuel is formed within the swirl chamber and injected from the nozzle port, thereby stably and efficiently injecting the fuel at a predetermined spray angle into extremely fine particle.