| 摘要 |
A vacuum generating device designed to generate negative pressure in an absorption means, such as an absorption pad, of a vacuum system, is disclosed. The vacuum generating device accomplishes the recent trend of compactness and smallness of such devices, effectively protects its ejector unit from damage, and does not have an increased production cost in comparison with conventional vacuum generating devices. The vacuum generating device includes a block body having an air inlet port, a vacuum port, and an air outlet port, an ejector unit functioning to generate negative pressure in response to an action of compressed air flowing thereto via the air inlet port, and a control valve mechanism functioning to open or close air supply paths branching from a main flow path to an air inlet chamber of the ejector unit and the vacuum port. The block body has a recess, formed by depressing a surface of the block body to a predetermined depth. The ejector unit is formed in the recess by depressing predetermined portions of the recess. A cover is set in the recess of the block body to seal the ejector unit from the outside. |
