Metering pump for varnish or lacquer

Abstract

A metering pump for varnish or laquer includes a housing in which are arranged a first gear wheel and a second gear wheel which is in engagement with the first gear wheel. At least the first gear wheel is mounted with a shaft in the housing. The pump further has a sealing device provided for the first gear wheel, wherein each gear wheel has a conveying area formed by a toothing, and wherein the sealing device is arranged between the conveying area and an end face area of the gear wheel. The sealing device is sealed in the housing by a radial sealing device.

1 . A metering pump for varnish or lacquer, the pump comprising a housing, a first gear wheel, and a second gear wheel in engagement with the first gear wheel, wherein at least the first gear wheel is mounted with a shaft in the housing, further comprising a sealing device for the first gear wheel, wherein each gear wheel has a conveying area formed by a toothing, and wherein the sealing device is arranged between the conveying area and an end face area of the gear wheel, further comprising a radial sealing device for sealing the sealing device in the housing.  
   
   
       2 . The metering pump according to  claim 1 , wherein the toothing has a base circle and wherein a radial distance between the sealing device and the base circle is smaller than a radial distance between the sealing device and the shaft.  
   
   
       3 . The metering pump according to  claim 2 , wherein the radial distance between the base circle and the sealing device is ≦1 mm.  
   
   
       4 . The metering pump according to  claim 1 , wherein the sealing device is mounted in the housing so as to be nonrotatable.  
   
   
       5 . The metering pump according to  claim 1 , wherein each gear wheel has at least in an area of the sealing device a wear-resistant surface.  
   
   
       6 . The metering pump according to  claim 5 , wherein the wear-resistant surface is comprised of a DLC-coating.  
   
   
       7 . The metering pump according to  claim 1 , wherein the sealing device is a sliding ring seal.  
   
   
       8 . The metering pump according to  claim 7 , wherein the sliding ring seal is comprised at least at a sealing surface thereof of a metal, a hard metal, a ceramic materia, or a fluoroplastic material.  
   
   
       9 . The metering pump according to  claim 1 , wherein the radial sealing device is mounted in the housing with little dead space.  
   
   
       10 . The metering pump according to  claim 1 , wherein a mounting gap exists between the radial sealing device and the conveying area, wherein a rinsing medium which flows through the conveying area flows through the mounting gap.  
   
   
       11 . The metering pump according to  claim 1 , wherein the sealing device seals axially at the gear wheel and radially in the housing in a direction of the conveying area.  
   
   
       12 . The metering pump according to  claim 11 , comprising a tensioning device for axially and radially pretensioning the sealing device.  
   
   
       13 . The metering pump according to  claim 1 , further comprising a supply connection of a protective medium ending radially within the sealing device.  
   
   
       14 . The metering pump according to  claim 1 , wherein both gear wheels are mounted in the housing on a shaft each.  
   
   
       15 . The metering pump according to  claim 14 , wherein the gear wheels are mounted axially on both sides in the housing.  
   
   
       16 . The metering pump according to  claim 1 , wherein the housing comprises an assembly surface, wherein a lacquer supply connection and a lacquer discharge connection end in the assembly surface, wherein a drive train for the first gear wheel extends through the assembly surface and wherein a supply block is mounted on the assembly surface.  
   
   
       17 . The metering pump according to  claim 16 , wherein the shaft of the first gear wheel ends in an area of the assembly surface and has a coupling profile at the assembly surface.  
   
   
       18 . The metering pump according to  claim 16 , wherein the supply block has a projection surrounding the drive train, wherein the projection engages in a recess of the assembly surface.