External Gear Pump for Hot Cooking Oil

Abstract

An overhung external spur gear positive displacement pump for hot oil or deep fryer applications is disclosed. The external gear pump includes a casing that includes a through bore for accommodating a drive shaft that leads to a pump chamber that accommodates a drive gear and a driven gear. The casing further includes a recess connected to the pump chamber for accommodating a stationary pin. The casing also includes a proximal end coupled to a prime mover and a distal end coupled to a head. The gears are enclosed in the pump chamber by the head. The stationary pin is accommodated within the driven gear and the drive shaft is coupled to the drive gear. The head is provided in the form of a flat plate with a plurality of holes for accommodating fasteners that couple the head to the distal end of the casing.

1 . An external gear pump comprising:
 a casing comprising a through bore for accommodating a drive shaft that leads to a pump chamber for accommodating a drive gear and a driven gear, the casing further comprising a recess connected to the pump chamber for accommodating a stationary pin, the casing further comprising a proximal end coupled to a prime mover and a distal end coupled to a head,   the gears enclosed in the pump chamber by the head,   the stationary pin accommodated within the driven gear, the drive shaft coupled to the drive gear,   the head consisting essentially of a flat plate with a plurality of holes for accommodating fasteners that couple the head to the distal end of the casing and the casing and head to a prime mover.   
     
     
         2 . The pump of  claim 1  wherein the fasteners are cap screws. 
     
     
         3 . The pump of  claim 1  wherein the through bore of the casing includes no bearings that engage the drive shaft. 
     
     
         4 . The pump of  claim 1  wherein the through bore of the casing and the drive shaft are sized so the through bore supports and provides a bearing function for the drive shaft without the use of an additional bearing. 
     
     
         5 . The pump of  claim 1  wherein the through bore comprises a distal end connected to the pump chamber and a proximal end connected to the proximal end of the casing, the proximal end of the through bore being recessed to accommodate a seal through which the drive shaft passes. 
     
     
         6 . The pump of  claim 1  wherein the casing and head are fabricated from iron. 
     
     
         7 . The pump of  claim 1  wherein the distal end of the casing comprises a groove that encircles the pump chamber for accommodating a seal that is sandwiched between the distal end of the casing and the head. 
     
     
         8 . A deep fryer pump, the pump comprising:
 a casing comprising a through bore for accommodating a drive shaft and a pump chamber for accommodating a drive gear and a driven gear, the casing further comprising a recess connected to the pump chamber for accommodating a stationary pin, the casing further comprising a proximal end coupled to a prime mover and a distal end coupled to a head,   the gears enclosed in the pump chamber by the head,   the stationary pin accommodated within the driven gear, the drive shaft coupled to the drive gear,   the head consisting essentially of a flat plate with a plurality of holes for accommodating fasteners that couple the head to the distal end of the casing and the casing and head to a prime mover.   
     
     
         9 . The deep fryer pump of  claim 8  wherein the fasteners are cap screws. 
     
     
         10 . The deep fryer pump of  claim 8  wherein the through bore of the casing includes no bearings that engage the drive shaft. 
     
     
         11 . The deep fryer pump of  claim 8  wherein the through bore of the casing and the drive shaft are sized so the through bore supports and provides a bearing function for the drive shaft without the use of an additional bearing. 
     
     
         12 . The deep fryer pump of  claim 8  wherein the through bore comprises a distal end connected to the pump chamber and a proximal end connected to the proximal end of the casing, the proximal end of the through bore being recessed to accommodate a seal through which the drive shaft passes. 
     
     
         13 . The deep fryer pump of  claim 8  wherein the casing and head are fabricated from iron. 
     
     
         14 . The deep fryer pump of  claim 8  wherein the distal end of the casing comprises a groove that encircles the pump chamber for accommodating a seal that is sandwiched between the distal end of the casing and the head. 
     
     
         15 . A deep fryer pump, the pump consisting essentially of:
 a casing consisting essentially of
 a through bore for accommodating a drive shaft, a pump chamber for accommodating a drive gear and a driven gear, 
 a recess connected to the pump chamber for accommodating a stationary pin, 
 a proximal end coupled to a prime mover, a distal end coupled to a head, and 
 a groove that encircles the pump chamber for accommodating a seal that is sandwiched between the distal end of the casing and the head, 
   the gears enclosed in the pump chamber by the head, the stationary pin accommodated within the driven gear, the drive shaft coupled to the drive gear,   the head consisting essentially of a flat plate with a plurality of holes for accommodating fasteners that couple the head to the distal end of the casing and the casing and head to a prime mover, and   the through bore comprises a distal end connected to the pump chamber and a proximal end connected to the proximal end of the casing, the proximal end of the through bore being recessed to accommodate a seal through which the drive shaft passes.   
     
     
         16 . The deep fryer pump of  claim 15  wherein the fasteners are cap screws. 
     
     
         17 . The deep fryer pump of  claim 15  wherein the through bore of the casing and the drive shaft are sized so the through bore supports and provides a bearing function for the drive shaft without the use of an additional bearing. 
     
     
         18 . The deep fryer pump of  claim 15  wherein the casing and head are fabricated from iron. 
     
     
         19 . The deep fryer pump of  claim 18  wherein the pump is listed for use as a deep fryer oil pump by NSF.