Ejector, fine solid piece recovery apparatus and fluid conveyor

Conveyors: fluid current – Fluid current conveyor outlet means – With material separating receptacle

Reexamination Certificate

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Details

C406S092000, C406S086000, C406S194000

Reexamination Certificate

active

06974279

ABSTRACT:
An ejector is configured to generate a high negative pressure capable of sucking and conveying fine metal pieces or chips, such as machinings or cuttings, for example, when using the ejector as a driving source for a fluid conveyor. The ejector includes a convergent-divergent nozzle having a throat formed between a suction port and a discharge port. Jet blowing holes are formed in the convergent-divergent nozzle to direct a jet stream from upstream of the throat to downstream of the throat, thereby forming a negative pressure. Pressure control holes open to the downstream of the jet blowing holes and are configured to communicate with a pressure space at a pressure level higher than a negative pressure formed by the jet stream and lower than a static pressure of the jet stream and the inside of the convergent-divergent nozzle.

REFERENCES:
patent: 2751257 (1956-06-01), Peterson et al.
patent: 2982082 (1961-05-01), Pool
patent: 3774846 (1973-11-01), Schurig et al.
patent: 4010551 (1977-03-01), Rohde
patent: 4724272 (1988-02-01), Raniere et al.
patent: 5769572 (1998-06-01), Pfeiffer
patent: 6283833 (2001-09-01), Pao et al.
patent: 6523991 (2003-02-01), Maklad
patent: 2002-356224 (2002-12-01), None

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