Mixing eductor

In an eductor for mixing first and second liquids and wherein the first liquid is in a main stream flowing through an air gap to a venturi tube downstream from the air gap, the improvement wherein:

• the venturi tube has an annular sharp edge in the main stream, thereby dividing the main stream into a primary stream flowing through the tube and a secondary stream around the primary stream and flowing around the tube;
• by venturi action, the venturi tube mixes the primary stream and the second liquid to form a mixture;
• the eductor includes an outlet section for combining the mixture and the secondary stream;
• and
• an axially disposed reed member in the tube, thereby spreading the primary stream.

In an eductor for mixing first and second liquids and including an air gap, a supply nozzle upstream of the air gap and a flow guide downstream of the air gap and wherein the first liquid is in a stream flowing in a downstream direction, the improvement comprising:

• a tube in the stream;
• the flow guide is annular around the tube;
• the tube and the flow guide are in spaced telescoped relationship;
• the tube divides the stream into a primary stream and a secondary stream;
• and
• the eductor includes an axially-disposed reed member in the primary stream.

In an eductor for mixing first and second liquids and wherein the first liquid is in a main stream flowing through an air gap to a venturi tube downstream from the air gap, the improvement wherein:

• the venturi tube has an annular sharp edge in the main stream, thereby dividing the main stream into a primary stream flowing through the tube and a secondary stream around the primary stream and flowing around the tube;
• by venturi action, the venturi tube mixes the primary stream and the second liquid to form a mixture;
• the eductor includes an outlet section for combining the mixture and the secondary stream;
• a supply nozzle upstream of the air gap and a flow guide downstream of the air gap and wherein:
• the flow guide is annular around the tube;
• the tube and the flow guide are in spaced telescoped relationship the flow guide including a portion which angles toward an inlet portion of the tube;
• the tube and the flow guide define an annular unobstructed space means therebetween;
• the annular space means substantially preventing air from passing therethrough when the secondary stream fills the space means.

In an eductor for mixing first and second liquids and wherein the first liquid is in a main stream flowing through an air gap to a venturi tube downstream from the air gap, the improvement wherein:

• the venturi tube has an annular sharp edge in the main stream, thereby dividing the main stream into a primary stream flowing through the tube and a secondary stream around the primary stream and flowing around the tube;
• by venturi action, the venturi tube mixes the primary stream and the second liquid to form a mixture;
• the eductor includes an outlet section for combining the mixture and the secondary stream;
• an output section having:
• a deceleration chamber reducing the velocity of the secondary stream, such deceleration chamber having an essentially straight walled section and a maximum chamber cross-sectional area;
• and
• a combining zone downstream of the deceleration chamber having a maximum cross-sectional area less than the chamber cross-sectional area, the straight walled section of the deceleration chamber extending to the combing zone.

In an eductor for mixing first and second liquids and including an air gap, a supply nozzle upstream of the air gap and a flow guide downstream of the air gap, and wherein the first liquid is in a stream flowing in a downstream direction, the improvement comprising:

• a tube in the stream;
• the flow guide is annular around the tube;
• the tube and the flow guide are in spaced telescoped relationship;
• wherein (a) the stream is a main stream, (b) the tube divides the main stream into a primary stream flowing through the tube and a secondary stream around the primary stream and flowing around the tube, and (c) the eductor includes an output section having:
• a deceleration chamber reducing the velocity of the secondary stream, such deceleration chamber having an essentially straight walled section and a maximum chamber cross-sectional area;
• and
• a combining zone downstream of the deceleration chamber and having a cross-sectional area less than the chamber cross-sectional area, the straight walled section of the deceleration chamber extending to the combing zone.

In an eductor for mixing first and second liquids and including an air gap, a supply nozzle upstream of the air gap and a flow guide downstream of the air gap, and wherein the first liquid is in a stream flowing in a downstream direction, the improvement comprising:

• a tube in the stream;
• the flow guide is annular around the tube;
• the tube and the flow guide are in spaced telescoped relationship, the flow guide including a portion which angles toward an inlet portion of the tube;
• wherein:
• the stream is a main stream;
• the tube divides the main stream into a primary and a secondary stream;
• the tube and the flow guide define an annular unobstructed space means therebetween;
• the annular space means substantially preventing air from passing therethrough when the secondary stream fills the space means.

An eductor for mixing water and a second liquid comprising:

• an air gap;
• a flow guide;
• a venturi tube, a portion of the flow guide surrounding the venturi tube to provide a means for effecting a seal region;
• an overflow chamber isolated from the air gap by a wall member, the overflow chamber being in fluid communication with the seal region;
• wherein a portion of liquid flows from the flow guide through the venturi tube and another portion flows between the flow guide and venturi tube into the seal region.