Patent ID: 7207190

Claim:
An ejector comprising: a high pressure space into which a high pressure fluid flows from an inlet; throttle means having a throttle portion for reducing a passage area of said high pressure fluid from said high pressure space towards a fluid jet port; a needle valve for changing an opening of said throttle portion by undergoing displacement in an axial direction of said throttle portion; a suction space having a second inlet into which a fluid flows and said jet port arranged therein, and sucking said fluid from said second inlet by an entrainment operation of an operation fluid jetted at a high speed from said fluid jet port; an opposite side end portion space at which an end portion of said needle valve on an opposite side to said jet port is positioned; a pressure partition disposed between the opposite side end portion space and the high pressure space; and a passage which communicates between the opposite side end portion space and a space at which an end portion of said needle valve on a side of said jet port is positioned, for introducing substantially the same pressure as that of the suction space.