Negative pressure supply apparatus
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United States of America Patent
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Sep 22, 2009
Grant Date -
May 5, 2005
app pub date -
Aug 25, 2004
filing date -
Oct 31, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
When coils of a vacuum pump unit are excited by energization, a piston equipped with magnets reciprocates in a cylinder. Thus, air is sucked in from an outlet passage of a diffuser of an ejector, and air discharged from the vacuum pump unit is supplied to an inlet of a nozzle of the ejector. Consequently, a fast jet occurs in a throat portion of the nozzle, and a negative pressure of higher degree of vacuum than that of the suction negative pressure of the vacuum pump unit is produced at a vacuum port of the ejector. The negative pressure is supplied from a negative pressure supply port. The ejector can supply a negative pressure of high degree of vacuum while reducing the load on the vacuum pump unit.
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