Patent ID: 6779985
Filing Date: 2004-08-24
Classification: F04F

Abstract:
A vacuum generating device, comprising 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 into the ejector unit 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, said main flow path communicating with the air inlet port, whereinsaid block body has a recess, said recess being formed by depressing a surface of the block body to a predetermined depth; said ejector unit comprises a first air inlet chamber, a first vacuum chamber and a first air outlet chamber which are formed in said recess by depressing predetermined portions of the recess and respectively communicate with the air inlet port, the vacuum port and the air outlet port of said block body, with communicating means for allowing the first air inlet chamber, first vacuum chamber, and the first air outlet chamber to communicate with each other; and a cover is set in said recess of the block body to seal the first air inlet chamber, first vacuum chamber, and the first air outlet chamber of the ejector unit from the outside.