Patent ID: 6739520
Filing Date: 2004-05-25
Classification: F02D,F02M

Abstract:
A liquid injection apparatus comprising:an injection device including a liquid ejection nozzle having one end exposed to a liquid injection space, a piezoelectric/electrostrictive element, a chamber connected to the other end of said liquid ejection nozzle, said chamber having a volume that is changed by an operation of said piezoelectric/electrostrictive element, a liquid supply passage connected to said chamber, and a hollow cylindrical liquid filling port allowing said liquid supply passage to communicate with the exterior; pressurizing means for pressurizing a liquid; an electromagnetic ejection valve to which liquid pressurized by said pressurizing means is supplied, said electromagnetic ejection valve including a solenoid valve and an ejection hole which is opened or closed by said solenoid valve, wherein said electromagnetic ejection valve ejects said pressurized liquid through said ejection hole when said solenoid valve is opened; and a hermetically sealed space forming member for forming a hollow cylindrical hermetically sealed space between said ejection hole of said electromagnetic ejection valve and said liquid filling port of said injection device, said hermetically sealed space having a diameter that is substantially the same as a diameter of said liquid filling port; wherein liquid ejected from said electromagnetic ejection valve is atomized by a change of volume of said chamber and injected in the form of droplets from said liquid ejection nozzle into said liquid injection space; and wherein said electromagnetic ejection valve is configured to eject said liquid from said ejection hole in a direction having a predetermined angle relative to a center axis of said hollow cylindrical hermetically sealed space, such that the distance of said liquid from said center axis increases accordingly as the distance from said ejection hole toward said liquid filling port increases.