Quill drive miniature roots blower

Abstract

A multi-lobe, or Roots, blower has two multi-lobe rotors connected for rotation to two drive gears one of which drive gears is connected for rotation to a motor by a quill drive spanning one of the rotors. In sequence, the multi-lobe rotors are preferably within a first chamber of a monolithic housing, the drive gears within a second chamber, and the motor outside the housing. In the quill drive a central shaft is affixed at one end to a shaft of the motor, and at its other end to a hollow tubular shaft containing the central shaft. The tubular shaft affixes at its exterior both one of the two drive gears and one of the two multi-lobe rotors. The quill drive thus transmits torque from the shaft of the motor along the central shaft completely through the first chamber and a multi-lobe rotor therein until, ultimately affixing the tubular shaft and the drive gear within the second chamber, the drive gears and the rotors are caused to be rotated. The quill drive Roots blower so constructed is smooth in operation, insensitive to external vibrations and shock, economical and durable.

What is claimed is:  
     
         1 . A multi-lobe blower comprising: 
 a quill drive.    
     
     
         2 . The multi-lobe blower according to  claim 1  further comprising: 
 a plurality of multi-lobe rotors; connected for rotation to  
 an associated plurality of drive gears; at least one of which drive gears is connected for rotation to  
 a motor;  
 wherein the quill drive spans one of the plurality of multi-lobe rotors.  
 
     
     
         3 . The multi-lobe blower according to  claim 2  further comprising: 
 a housing defining two chambers;  
 wherein the plurality of multi-lobe rotors are within one chamber of the housing;  
 wherein the plurality of drive gears are within the other chamber of the housing.  
 
     
     
         4 . The multi-lobe blower according to  claim 3   wherein the motor is outside the housing.    
     
     
         5 . The multi-lobe blower according to  claim 4  further comprising: 
 a shaft connecting a multi-lobe rotor within one chamber of the housing to a drive gear within the other chamber of the housing.  
 
     
     
         6 . The multi-lobe blower according to  claim 5  wherein the motor has a shaft and the quill drive comprises: 
 a quill drive central shaft; affixed at its one end to the shaft of the motor and affixed at its other end to  
 a quill drive hollow tubular shaft containing the central shaft and mounting at its exterior both one of the plurality of drive gears and one of the plurality of multi-lobe rotors;  
 wherein the quill drive transmits torque from the shaft of the motor along the quill drive central shaft to the quill drive tubular shaft affixed thereto, and then to that one of the drive gears and to that one of the multi-lobe rotors mounted to this tubular shaft.  
 
     
     
         7 . The multi-lobe blower according to  claim 6   wherein the plurality of drive gears are intermeshing; and    wherein, by the intermeshing of the plurality of drive gears, that one drive gear driven by the quill drive tubular shaft does drive the other drive gear and then the multi-lobe rotor associated with this other drive gear.    
     
     
         8 . A Roots blower comprising: 
 a housing defining at least one chamber: 
 two Roots rotors located within the at least one chamber; mounted on  
 two rotor shafts at least one of which rotor shafts is tubular;  
 a motor, having a motor shaft, located outside the housing's at least one chamber to one side thereof;  
 two intermeshing drive gears, located outside the housing's at least one chamber to the other side thereof, with one drive gear mounted to an exterior of the at least one rotor shaft that is tubular and the other drive gear mounted to the remaining rotor shaft;  
 a quill drive shaft connecting to the motor shaft of the motor at one side of the housing's at least one chamber, and proceeding through the at least one rotor shaft that is tubular, and also through the Roots rotor and the drive gear that are mounted to this at least one rotor shaft that is tubular, and also through the housing's at least one chamber, until, outside the housing's at least one chamber at the opposite side thereof, connecting at its tip to the drive gear mounted upon at least one rotor shaft that is tubular.  
   
     
     
         9 . The Roots blower according to  claim 8   wherein the housing defines at least two chambers in one of which chambers are located the two Roots rotors and in another of which chambers are located the two intermeshing drive gears.    
     
     
         10 . The Roots blower according to  claim 8  further comprising: 
 bearings in the housing at the sides of the at least one chamber supporting both the two rotor shafts at both sides of the Roots blower rotors mounted to the two rotor shafts.  
 
     
     
         11 . The Roots blower according to  claim 8   wherein the quill drive shaft is of a quadrilateral cross section.    
     
     
         12 . The Roots blower according to  claim 11   wherein the quill drive shaft is of square cross section.    
     
     
         13 . The Roots blower according to  claim 8   wherein the quill drive shaft is tapered from relatively greater thickness at the connected motor shaft to relatively lessor thickness at the connected drive gear.    
     
     
         14 . The Roots blower according to  claim 6  further comprising: 
 a clamp mounting the motor to the housing.  
 
     
     
         15 . A multi-lobe blower comprising: 
 a motor;    a housing affixing at a one side the motor, and defining two chambers;    multi-lobe rotors rotationally mounted within a first chamber of the housing that is closest to the affixed motor;    intermeshing drive gears, rotationally mounted within the remaining second chamber of the housing, respectively rotationally affixing the multi-lobe rotors; and    a quill drive between the motor and a connected one of the intermeshing drive gears;    wherein the motor rotates the quill drive to rotate the quill-drive-connected one of the intermeshing drive gears to therein rotate all intermeshing drive gears and those multi-lobe rotors to which the drive gears are rotationally affixed.    
     
     
         16 . The multi-lobe blower according to  claim 15  comprising: 
 a sheet metal cover plate to the second chamber of the housing in an “L” contour so as to also serve as mounting plate for the entire multi-lobe blower.  
 
     
     
         17 . To a method of rotating multi-lobe rotors in a multi-lobe blower by 
 first-connecting these rotors for rotation to associated drive gears,    intermeshing the drive gears for co-rotation,    second-connecting for rotation at least one of the intermeshing drive gears to a shaft of a motor, and    energizing the motor so as to rotate its shaft, the improvement wherein the second-connecting comprises: 
 spanning with a quill drive one of the multi-lobe rotors.