Arrangement including a gear pump

Abstract

An arrangement including a gear pump ( 1 ), comprising a pump housing ( 10 ), two meshing gear wheels ( 11, 12 ) contained in the pump housing ( 10 ) and two shafts ( 2, 3 ) which are operatively connected to the gear wheels ( 11, 12 ) and extend through the pump housing ( 10 ), is disclosed wherein the two shafts ( 2, 3 ) are each operatively connected to respective drive units ( 7, 8 ). The arrangement includes a coupling unit ( 22 ) for compensation of eccentricities between the drive unit ( 7, 8 ) and the respective shaft ( 2, 3 ) is arranged between each gear wheel ( 11, 12 ) and drive unit ( 7, 8 ) and that a rotary encoder/sensor unit ( 24, 25 ) is arranged between the center of the gear wheel and the center of the respective drive.

1 . An arrangement including a gear pump, comprising a pump housing, two meshing gear wheels contained in the pump housing and two shafts which are operatively connected to the gear wheels and extend through the pump housing, wherein the two shafts are each operatively connected to respective drive units, and wherein a coupling unit for compensation of eccentricities between the drive unit and the respective shaft is arranged between each gear wheel and drive unit and wherein a rotary encoder/sensor unit is arranged between the center of the gear wheel and the center of the respective drive. 
     
     
         2 . Arrangement according to  claim 1 , wherein the rotary encoder/sensor unit is located in an axial region which is defined by the center between the center of the gear wheel and the center of the drive plus a deviation on both sides of at most 10% of the distance between the center of the gear wheel and the center of the drive. 
     
     
         3 . Arrangement according to  claim 2 , wherein the rotary speed/sensor units are respectively arranged in the middle between the respective center of the gear wheel and the respective center of the drive. 
     
     
         4 . Arrangement according to  claim 1 , wherein the rotary encoders/sensor units feature a radial distance to a rotation axis of the respective shaft which is at least twice as large, as the outer radius of the gear wheels. 
     
     
         5 . Arrangement according to  claim 1 , wherein the rotary encoders/sensor units are either optical or magnetic rotary encoders/sensor units. 
     
     
         6 . Arrangement according to  claim 1 , wherein the rotary encoders/sensor units are arranged such that a connecting line which runs through the corresponding rotary encoder/sensor unit and extends perpendicularly from the shaft encloses together with a plane which centrally extends between the two rotation axes on a suction side an angle in the range of 40° to 50°. 
     
     
         7 . Arrangement according to  claim 1 , wherein each drive unit features a rotor and a stator, wherein the rotor is axially moveable with respect to the stator. 
     
     
         8 . Arrangement according to  claim 7 , wherein the drive unit features on the far side with respect to the gear pump a differential bearing unit which radially supports the rotor of the drive unit. 
     
     
         9 . Arrangement according to  claim 8 , wherein the rotor of the drive unit is connected to the respective shaft of the gear pump via the coupling unit, therewith radially supporting the rotor on the gear wheel side. 
     
     
         10 . Arrangement according to  claim 1 , wherein the coupling unit is a membrane coupling. 
     
     
         11 . Arrangement according to  claim 1 , wherein a flange is arranged between the pump housing and the stator the respective drive unit, wherein the flange features bores through which a cooling agent circulates for adjusting the temperature. 
     
     
         12 . Arrangement according to  claim 1 , wherein the drive units are connectable to the respective shaft of the gear pump from the far side with respect to the gear pump. 
     
     
         13 . Arrangement according to  claim 12 , wherein the connections between the drive units and the respective shafts of the gear pump are conical polygon connections. 
     
     
         14 . Arrangement according to  claim 1 , wherein the drive units are of the torque motor type. 
     
     
         15 . Arrangement according to  claim 1 , wherein the one drive unit, the gear pump and the other drive unit are each contained in a temperature zone in which the temperatures are adjustable to specified values, and wherein isolation regions are present between neighboring temperature zones. 
     
     
         16 . Arrangement according to  claim 1 , wherein a current position of one gear wheel is determinable with respect to the current position of the other gear wheel and wherein the current position of the one gear wheel is continuously adjustable with respect to the current position of the other gear wheel according to specified predefined operating conditions.