Fluid ejector pumps

Abstract

A fluid ejector pump is characterized by a longitudinally extending flow passage with a fluid inlet end and a fluid outlet end. The fluid inlet end includes a Venturi tube inlet having a relatively larger diameter entry opening for being supplied with pressurized fluid and a relatively smaller diameter exit opening within the flow passage. An air inlet communicates with the flow passage adjacent the exit opening for the intake of air into the fluid exiting the Venturi tube inlet. A shaped deflector is located in the flow passage upstream of the exit opening, with the flow passage defining an annular gap around and along the deflector. An upstream end of the deflector has an upward angle causing acceleration of the fluid flowing upstream in the flow passage. A hi-low mixing effect is produced in the flow passage for greater mixing and turbulence of the fluid while vacuum or suction at the suction inlet is increased.

1 . A fluid ejector pump comprising 
 an elongate body defining a longitudinally extending flow passage having a central longitudinal axis, an open inlet end and an open outlet end upstream of said inlet end;    a Venturi tube inlet at said inlet end coaxial with said central longitudinal axis and including an entry opening for being supplied with a source of pressurized fluid and an exit opening upstream in said flow passage, said entry opening having a first diameter, said exit opening having a second diameter smaller than said first diameter;    a suction inlet in said body comprising an air entry port in communication with said flow passage adjacent said exit opening; and    a shaped deflector in said flow passage coaxial with said central longitudinal axis and having a downstream end of partial spherical configuration spaced longitudinally in an upstream direction from said exit opening, an intermediate section of cylindrical configuration extending in the upstream direction from said downstream end, and an upstream section of frustoconical configuration extending angularly outwardly in the upstream direction from said intermediate section, said deflector being axially aligned with said entry opening and said exit opening of said Venturi tube inlet, and said flow passage defining an annular space along said deflector between said deflector and said body.    
   
   
       2 . The fluid ejector pump recited in  claim 1  wherein said deflector is solid.  
   
   
       3 . The fluid ejector pump recited in  claim 1  wherein said deflector has a lumen extending entirely therethrough coaxial with said central longitudinal axis.  
   
   
       4 . The fluid ejector pump recited in  claim 3  wherein said flow passage includes a mixing region upstream of said deflector.  
   
   
       5 . The fluid ejector pump recited in  claim 4  wherein said lumen of said deflector has an entry hole at said downstream end and an outlet hole at said upstream section in communication with said mixing region, said lumen having a downstream segment of uniform diameter extending from said entry hole to an upstream segment of continuously increasing diameter extending from said downstream segment to said outlet hole, said entry hole having a diameter the same as said diameter of said downstream segment, and said outlet hole having a diameter corresponding to a maximum diameter for said upstream segment.  
   
   
       6 . The fluid ejector pump recited in  claim 5  wherein said first diameter is substantially 1.6 inches, said second diameter is substantially 0.7 inch, said diameter of said downstream segment is substantially 0.4 inch, said diameter of said outlet hole is substantially 0.8 inch, said intermediate section has an external diameter of substantially 0.8 inch, said upstream section has a maximum external diameter of substantially 1.2 inches and said flow passage has a diameter of substantially 1.6 inches.  
   
   
       7 . A fluid ejector pump comprising 
 an elongate body defining a longitudinally extending flow passage entirely therethrough having a central longitudinal axis, an open downstream end and an open upstream end;    a Venturi tube inlet at said downstream end coaxial with said central longitudinal axis and defining a flow channel entirely therethrough, said Venturi tube inlet including an entry opening for being supplied with a source of pressurized fluid, said Venturi tube inlet extending from said entry opening to terminate at an exit opening upstream in said flow passage, said entry opening having a first diameter and said exit opening having a second diameter smaller than said first diameter, said flow channel including a downstream portion extending from said entry opening to an intermediate portion and an upstream portion extending from said intermediate portion to said exit opening, said downstream portion being uniformly of said first diameter, said upstream portion being uniformly of said second diameter and said intermediate portion being continuously tapering in diameter from said first diameter to said second diameter, said intermediate portion having a length and said upstream portion having a length less than said length of said intermediate portion;    a suction inlet in said body comprising at least one air entry port in communication with said flow passage adjacent said exit opening, said at least one air entry port being aligned with said exit opening in a direction perpendicular to said central longitudinal axis; and    a shaped deflector in said flow passage coaxial with said central longitudinal axis and having a downstream end of partial spherical configuration spaced longitudinally in an upstream direction from said exit opening, an intermediate section of cylindrical configuration extending angularly outwardly in the upstream direction from said downstream end, and an upstream section of frustoconical configuration extending in the upstream direction from said intermediate section, said deflector being axially aligned with said entry opening and said exit opening of said Venturi tube inlet, and said flow passage defining an annular space along said deflector between said deflector and said body.    
   
   
       8 . The fluid ejector pump recited in  claim 7  wherein said suction inlet has a central axis perpendicular to said central longitudinal axis of said flow passage and said exit opening is located upstream of said central axis of said suction inlet.  
   
   
       9 . The fluid ejector pump recited in  claim 7  wherein said deflector further includes a plurality of struts extending radially outwardly from said intermediate section into engagement with said body to center said deflector in said flow passage.  
   
   
       10 . The fluid ejector pump recited in  claim 7  and further including a handle attached to said body.  
   
   
       11 . The fluid ejector pump recited in  claim 10  wherein said handle is removably attached to said body.  
   
   
       12 . The fluid ejector pump recited in  claim 7  wherein said deflector is solid and said upstream section of said deflector is angled outwardly from said intermediate section by an angle of substantially 45 degrees.  
   
   
       13 . The fluid ejector pump recited in  claim 7  wherein said deflector has a lumen extending therethrough and said upstream section of said deflector is angled outwardly from said intermediate section by an angle of substantially 13 degrees.  
   
   
       14 . The fluid ejector pump recited in  claim 13  wherein said lumen has an entry hole at said downstream end of said deflector and an outlet hole at said upstream section, said lumen having a downstream segment of uniform diameter extending from said entry hole to an upstream segment of continuously increasing diameter extending from said downstream segment to said outlet hole.  
   
   
       15 . The fluid ejector pump recited in  claim 14  wherein said flow passage includes a mixing region upstream and adjacent said outlet hole.  
   
   
       16 . A fluid ejector pump comprising 
 an elongate body defining a longitudinally extending flow passage entirely therethrough having a central longitudinal axis, an open downstream end and an open upstream end;    a Venturi tube inlet at said downstream end coaxial with said central longitudinal axis and defining a flow channel entirely therethrough, said Venturi tube inlet including an entry opening for being supplied with a source of pressurized fluid, said Venturi tube inlet extending from said entry opening to terminate at an exit opening upstream in said flow passage, said entry opening having a first diameter and said exit opening having a second diameter smaller than said first diameter, said flow channel including a downstream portion extending from said entry opening to an intermediate portion and an upstream portion extending from said intermediate portion to said exit opening, said downstream portion being uniformly of said first diameter, said upstream portion being uniformly of said second diameter and said intermediate portion being continuously tapering in diameter from said first diameter to said second diameter;    a suction inlet in said body comprising at least one air entry port in communication with said flow passage adjacent said exit opening, said air entry port being aligned with said exit opening in a direction perpendicular to said central longitudinal axis, said flow passage being uniformly of said first diameter from said suction inlet to said upstream end; and    a shaped deflector in said flow passage coaxial with said central longitudinal axis and having a downstream end of partial spherical configuration spaced longitudinally in an upstream direction from said exit opening, an intermediate section of cylindrical configuration extending in the upstream direction from said downstream end of said deflector, and an upstream section of frustoconical configuration extending angularly outwardly in the upstream direction from said intermediate section, said deflector being axially aligned with said entry opening and said exit opening of said Venturi tube inlet, and said flow passage defining an annular space along said deflector between said deflector and said body.    
   
   
       17 . The fluid ejector pump recited in  claim 16  wherein said suction inlet comprises a tubular extension of said body perpendicular to said central longitudinal axis and defining said at least one air entry port through said tubular extension.  
   
   
       18 . The fluid ejector pump recited in  claim 16  wherein said air entry port comprises a plurality of slots in said body extending parallel to said central longitudinal axis at spaced radial locations about said central longitudinal axis.  
   
   
       19 . The fluid ejector pump recited in  claim 16  wherein said deflector includes a lumen extending entirely therethrough coaxial with said central longitudinal axis, said lumen has an entry hole at said downstream end of said deflector and an outlet hole at said upstream section, said lumen having a downstream segment of uniform diameter extending from said entry hole to an upstream segment of continuously increasing diameter extending from said downstream segment to said outlet hole.  
   
   
       20 . The fluid ejector pump recited in  claim 19  wherein said first diameter is substantially 1.6 inches, said second diameter is substantially 0.7 inch, said downstream segment of said lumen has a diameter of substantially 0.4 inch, said upstream segment of said lumen has a maximum diameter of substantially 0.8 inch, said intermediate section of said deflector has an external diameter of substantially 0.8 inch, and said upstream section of said deflector has a maximum external diameter of substantially 1.2 inches.