| 摘要 |
In a multistage ejector system provided with ejectors in a multistage, a high-pression assembling of a plurality of nozzles and diffusers is made unnecessary, assembling of these parts is easy and these parts can be formed at a low cost. A body (2) of the multistage ejector system has a grooved structure provided in the thick bottom portion thereof with a through bore (5) into which a nozzle body (12) and a multistage ejector structure (14) are inserted. The multistage ejector structure (14) is provided with diffuser-nozzles (15a, 15b) and a final-stage diffuser (15c) which are provided coaxially with an ejection port (13) of a nozzle body, larger-diameter portions (16a, 16b) having air suction ports (17a, 17b) and formed among the parts (15a, 15b, 15c), and flanges (18a-18c) provided on the outer circumferential surfaces of the parts (15a-15c), with these components being integrally molded. Vacuum generating chambers (21a-21c) defined by the flanges are formed among the inner surface of the through bore in the system body and the outer surfaces of the nozzle body and multistage ejector structure which are fitted air-tightly in the through bore, and these chambers communicate with a suction port (31) via a plurality of suction passages provided in the through bore in the system body. |
