Double motor vacuum

Abstract

A vacuum having a series of motors and fans. As the fans rotate, they draw air into the vacuum. The volume of the air brought into the vacuum is maximized by positioning the fans in series. A plurality of fans is positioned so that outflow from a first fan is the primary inflow into a second fan, and so forth. Together the fans will draw more air than one could alone. By positioning the fans in series, the external diameter of the vacuum does not need to be any larger than it would for a vacuum having a single fan. The fans and motors are contained in a housing having an intake aperture. The intake aperture is preferably separated from the intake opening to the first fan and is preferably slightly smaller than the intake openings to the first fan. This will cause air entering the housing to accelerate.

1 . A vacuum comprising 
 a body having a nozzle configured to allow air into said body and an exhaust vent configured to allow air to exit said body;    a filter configured to separate dust and debris from air passing through said body;    a power source    a housing containing a leading fan and at least one following fan, each said fan being operatively connected to and rotated by a motor in operative connection with said power source, each said fan configured to intake and discharge air, wherein said leading fan is positioned to intake air external to said housing and wherein said following fan is positioned to intake the air discharged from said leading fan, and wherein said leading fan and said following fan are aligned with each other in said housing so that said fans rotate in substantially parallel planes and so that said fans rotate on substantially the same axis; and    wherein said housing and said fans are positioned in said body to draw air into said nozzle, through said filter, through said housing and out said exhaust vent.    
   
   
       2 . A vacuum according to  claim 1  wherein at least one of said fans is a radial fan.  
   
   
       3 . A vacuum according to  claim 2  wherein at least one of said fans further comprises a plurality of curved vanes.  
   
   
       4 . A vacuum according to  claim 2  wherein at least one of said fans is enclosed within a base plate and a fan cover.  
   
   
       5 . A vacuum according to  claim 4  wherein said base plate comprises a vent and wherein said fan cover comprises a centrally located intake opening, whereby the intake and discharge of air from said at least one of said fans may be controlled.  
   
   
       6 . A vacuum according to  claim 1  wherein said housing further comprises and intake end, a discharge end, and substantially airtight sidewalls extending therebetween.  
   
   
       7 . A vacuum according to  claim 6  wherein said intake end further comprises an intake aperture and wherein said discharge end further comprises a discharge vent.  
   
   
       8 . A vacuum according to  claim 7  further comprising a base plate positioned between said leading fan and said at least one following fan, said base plate having a vent providing air passage through said base plate and wherein said base plate and said sidewalls are in substantially air tight engagement whereby air may not pass from said leading fan to said at least one following fan via said housing without passing through said vent in said base plate.  
   
   
       9 . A vacuum according to  claim 8  wherein said leading fan is separated from said intake aperture of said housing by a distance that is at least about the diameter of said leading fan.  
   
   
       10 . A vacuum according to  claim 8  wherein said leading fan is provided with a fan cover having a centrally positioned intake opening, said cover and intake opening positioned and configured to substantially prevent the intake of air by said leading fan except through said intake opening.  
   
   
       11 . A vacuum according to  claim 10  wherein said intake opening of said cover is separated from said intake aperture of said housing by a distance that is at least about the diameter of said leading fan.  
   
   
       12 . A vacuum according to  claim 11  wherein said intake aperture of said housing is smaller in area than said intake opening of said cover.  
   
   
       13 . A vacuum according to  claim 12  wherein said sidewalls taper outward from said intake aperture to where said sidewalls meet said base plate.  
   
   
       14 . A vacuum according to  claim 11  wherein said sidewalls taper outward from said intake aperture to where said sidewalls meet said base plate.