Vacuum generating device
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United States of America Patent
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May 4, 2004
Grant Date -
May 1, 2003
app pub date -
Oct 30, 2002
filing date -
Nov 1, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A vacuum generating device, fabricated in the form of an ejector pump stack and used for generating negative pressure in an absorption unit, such as an absorption pad of a vacuum feeding system, is disclosed. The vacuum generating device includes a plurality of ejector pump modules that share the same shape and construction and are closely arranged in a casing to be stacked side by side while being brought into contact with each other. The casing holds the ejector pump modules in place inside the vacuum generating device. A vacuum-off unit, used for releasing vacuum pressure from vacuum chambers of the ejector pump modules, is mounted onto the casing. The vacuum generating device also includes a vacuum-on solenoid valve connected to a first air inlet port of the casing, and a vacuum-off solenoid valve connected to a second air inlet port of the vacuum-off unit. The single vacuum-on solenoid valve performs the vacuum-on operation for the ejector pump modules, and the single vacuum-off solenoid valve performs the vacuum-off operation for the ejector pump modules. The vacuum generating device thus has a very simple construction.
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