초록 ▼

An apparatus for inserting a venturi tube having an inlet, an aspirator inlet and an outlet directly within a fluid flow stream, with the aspirator inlet not in contact with the fluid flow stream is disclosed. A plate having a first aperture leading to the venturi inlet, and a series of second apert

An apparatus for inserting a venturi tube having an inlet, an aspirator inlet and an outlet directly within a fluid flow stream, with the aspirator inlet not in contact with the fluid flow stream is disclosed. A plate having a first aperture leading to the venturi inlet, and a series of second apertures both supports the venturi within a conduit and divides the fluid flow stream into a first stream which flows through the venturi tube and a second stream which flows around the venturi tube. A variety of adjusting mechanisms are disclosed for varying the cross sectional area of the second apertures relative to the cross sectional area of the venturi tube. The apparatus is adapted to allow the back pressure within the venturi tube (which increases as the fluid flow rate increases) to force an increasing proportion of the flow stream to flow around the venturi tube in order to maintain a relatively constant aspiration rate within the venturi tube. The adjustment mechanisms disclosed include a second plate, similar to the first plate, which is manually rotated and a blocking ring which moves responsive to changes in rate of flow of the fluid flow stream.

대표청구항 ▼

Apparatus for use within a conduit for a fluid flow stream comprising a venturi tube having an inlet, an aspirator inlet and an outlet; and a disc positioned within said conduit in a sealable relationship therewith, said disc having a first aperture in communication with said venturi inlet and a plu

Apparatus for use within a conduit for a fluid flow stream comprising a venturi tube having an inlet, an aspirator inlet and an outlet; and a disc positioned within said conduit in a sealable relationship therewith, said disc having a first aperture in communication with said venturi inlet and a plurality of second apertures which are not in communication with said venturi inlet, said second apertures arranged in a circular configuration around said first aperture, said disc has a concave face which divides the fluid flow stream into a first stream flowing through said first aperture and a second stream flowing through said second apertures; and means for supporting said venturi tube within said conduit in such a manner that said venturi tube is aligned axially in the direction of said flow stream.