Ejector and vacuum generating device including the same

An ejector that generates a negative pressure under an action of compressed air, the ejector comprising:

• an ejector body in which an internal passage is formed;
• and
• a negative-pressure generating mechanism including a nozzle unit that is connected to the internal passage and that ejects compressed air and a diffuser unit that generates a negative pressure by using compressed air ejected by the nozzle unit and that discharges compressed air to outside,
• wherein the ejector body has a first attachment surface to which a valve body that serves as a body of a switching valve is fixedly attached and a second attachment surface to which a base body that serves as a body of a manifold base is fixedly attached,
• wherein an inflow port for supplying compressed air to the negative-pressure generating mechanism by being connected to an output port that is formed in the valve body of the switching valve is formed in the first attachment surface of the ejector body, and the inflow port communicates with the nozzle unit through a positive-pressure supply passage that is included in the internal passage in the ejector body,
• wherein a negative-pressure supply port for outputting a negative pressure, which is generated in the negative-pressure generating mechanism, to outside by being connected to a negative-pressure inflow port that is formed in the base body of the manifold base is formed in the second attachment surface of the ejector body, and the negative-pressure supply port communicates with the diffuser unit through a negative-pressure communication passage that is included in the internal passage in the ejector body,
• wherein the inflow port of the first attachment surface includes a first inflow port and a second inflow port that are respectively connected to a first output port and a second output port of the output port that are formed in the valve body of the switching valve,
• wherein one of the first inflow port and the second inflow port communicates with the nozzle unit through the internal passage, and
• wherein another one of the first inflow port and the second inflow port communicates with the negative-pressure supply port through the internal passage.