Ejector

摘要

An ejector includes: a decompression chamber in an outer pipe on an air entrance side; a throat in the outer pipe on an air exit side; a nozzle in the outer pipe on the air entrance side, the nozzle having a leading end portion placed in a decompression chamber to inject air; and a suction port in the decompression chamber to suck blow-by gas into the decompression chamber. The air injected from the nozzle generates negative pressure in the decompression chamber to suck in blow-by gas through the suction port, and the sucked gas is discharged together with air through a throat. The valve in the nozzle includes a valve seat, a valve element, and a spring to press the valve element in a direction to separate from the valve seat. The valve element is formed with a bottom-closed cavity opening toward an upstream side of an air flow.

主权项

1. An ejector including:
an outer pipe; a decompression chamber provided in the outer pipe on an entrance side for working fluid; a throat provided in the outer pipe on an exit side for the working fluid; a nozzle provided in the outer pipe on the entrance side for the working fluid, the nozzle including a leading end portion placed in the decompression chamber to inject the working fluid; and a suction port provided in the outer pipe to open into the decompression chamber to suck target fluid into the decompression chamber, wherein
the ejector is configured such that the working fluid injected from the nozzle generates negative pressure in the decompression chamber to suck in the target fluid through the suction port, the target fluid being discharged together with the working fluid from the outer pipe;the nozzle is provided with a valve to regulate a flow rate of the working fluid allowed to flow through the nozzle, the valve including a valve seat, a valve element provided to be movable into and out of contact with the valve seat, and a spring to urge the valve element in a direction to separate from the valve seat;the valve element includes a bottom-closed cavity, the cavity opening toward an upstream side of the working fluid;the valve element is configured to be pressed by a pressure of the working fluid such that the valve element moves in a valve-closing direction against a pressing force of the spring;the outer pipe has an opening and the nozzle includes a flange on an outer circumference thereof, the outer pipe and the nozzle being configured such that the flange of the nozzle is fitted in the opening of the outer pipe to connect the nozzle and the outer pipe, thereby forming the decompression chamber between the outer pipe and the nozzle;a pipe joint is provided to introduce the working fluid into the nozzle; andthe nozzle has an opening and the pipe joint includes a flange on an outer circumference thereof, the nozzle and the pipe joint being configured such that the flange of the pipe joint is fitted in the opening of the nozzle to connect the pipe joint and the nozzle, thereby forming a valve chamber for accommodating the valve element between the nozzle and the pipe joint while the motion of the valve element in a direction to separate from the valve seat is restricted by the pipe joint.