Gear pump

Abstract

The invention relates to a gear pump having two meshing gear wheels configured of a driven gear wheel and a gear wheel moving along with the same. A rotatably supported drive shaft is provided for driving the gear wheel, the shaft being held in the pump housing by bearing means. A sealing means is associated with the drive shaft at the circumference between the gear wheel and the bearing means, the sealing means comprising a pressure ring resting against a face of the gear wheel. In order to prevent the gear wheel in the pump housing from starting to run, a second sealing means having a second pressure ring is disposed on the opposite face of the gear wheel at the circumference of the drive shaft between a second bearing means and the gear wheel, wherein both pressure rings have a sealing shoulder opposite the gear wheel, the shoulder being pressed against the face of the gear wheel under the action of a spring means.

1 .- 15 . (canceled) 
   
   
       16 . A gear pump comprising:
 two meshing gears configured to convey paints, said gears comprising a driven gear and an idling gear; and   at least one drive shaft mounted to rotate, which is splined to the driven gear and is held by bearings in a pump housing, in which the drive shaft can be connected to a drive and in which a seal is assigned to the drive shaft on the periphery between the driven gear and one bearing, which includes a pressure ring lying against one face of driven gear,   wherein a second seal with a second pressure ring is arranged on the opposite face of gear on the periphery of the drive shaft between a second bearing and the driven gear and wherein both pressure rings have a sealing shoulder opposite the driven gear, each of which is forced against the face of the driven gear by a spring device.   
   
   
       17 . The gear pump according to  claim 16 , wherein the seals each have a sealing ring and wherein the sealing rings shield the bearings on both sides of the driven gear relative to the pressure rings and delimit on the periphery of the drive shaft a rinsing space formed between the pressure ring and the sealing ring. 
   
   
       18 . The gear pump according to  claim 17 , wherein each of the rinsing spaces is connected by a rinsing channel in the pump housing to a rinsing connection. 
   
   
       19 . The gear pump according to  claim 17 , wherein the two rinsing stations are connected to each other via several rinsing grooves between the drive shaft and the pressure rings and between the drive shaft and the driven gear. 
   
   
       20 . The gear pump according to  claim 16 , wherein the bearings are formed to support the drive shaft by at least two roller bearings whose roller bodies are held in an annular chamber filled with a lubricant. 
   
   
       21 . The gear pump according to  claim 16 , wherein the idling gear is splined to a shaft pin, which is supported on both sides of the idling gear by several bearings and wherein a seal is arranged on both sides of the idling gear on the periphery of the shaft pin, each of which has a pressure ring lying against the face of the idling gear. 
   
   
       22 . The gear pump according to  claim 21 , wherein the seals each have a sealing ring and wherein the sealing rings shield the bearings on both sides of the idling gear relative to pressure rings and delimit a rinsing space formed on the periphery of the shaft pin between the pressure ring and sealing ring. 
   
   
       23 . The gear pump according to  claim 22 , wherein each of the rinsing spaces is connected via a rinsing channel in the pump housing to a rinsing connection. 
   
   
       24 . The gear pump according to  claim 22 , wherein the two rinsing spaces are connected to each other via several rinsing grooves between the shaft pin and the pressure rings and between the shaft pin and the idling gear. 
   
   
       25 . The gear pump according to  claim 21 , wherein the bearings are formed to support the shaft pin through at least two roller bearings whose roller bodies are held in an annular chamber filled with lubricant. 
   
   
       26 . The gear pump according to  claim 16 , wherein the pressure rings are formed from a ceramic material and wherein the sealing rings are each designed as a groove ring. 
   
   
       27 . The gear pump according to  claim 16 , wherein the spring devices for pressing the pressure rings are each formed from a belleville spring stack. 
   
   
       28 . The gear pump according to  claim 16 , wherein the faces of gears are formed from a ceramic material. 
   
   
       29 . The gear pump according to  claim 16 , wherein the drive shaft is formed from a bearing shaft and a coupling shaft connected by a releasable rotary connection to bearing shaft, wherein the bearing shaft is connected to the driven gear within the pump housing and is supported by the bearings and wherein the coupling shaft is mounted to rotate outside of the pump housing in a support housing through a support bearing and can be connected to a drive on the free end. 
   
   
       30 . The gear pump according to  claim 29 , wherein the support housing is firmly connected to the pump housing and is penetrated by the drive shaft in a recess.