Potential equalization for a metering pump

Abstract

Metering pump having a stationary portion and a pump portion, which is mounted in a linear manner and can be moved relative to the stationary portion in order to move a displacement body, wherein, for the purpose of achieving a long service life, the pump portion is connected in an electrically potential-equalizing manner to the stationary portion via an electrically conductive spring element.

What is claimed is: 
     
         1 . A metering pump having a stationary portion and a pump portion, which is mounted in a linear manner and can be moved relative to the stationary portion in order to move a displacement body,
 wherein the pump portion is connected in an electrically potential-equalizing manner to the stationary portion via an electrically conductive spring element.   
     
     
         2 . The metering pump according to  claim 1 , wherein the pump portion is designed to move in a purely translational manner. 
     
     
         3 . The metering according to  claim 1 , wherein the metering pump has a pump drive, which is in the form of a linear drive. 
     
     
         4 . The metering according to  claim 1 , wherein one end of the spring element is in electrically conductive contact with the stationary portion, and one end of the spring element is in electrically conductive contact with the pump portion. 
     
     
         5 . The metering pump according to  claim 1 , wherein the spring element is in the form of a helical spring. 
     
     
         6 . The metering pump according to  claim 4 , wherein the spring element, in particular the helical spring, is arranged around at least part of the pump portion. 
     
     
         7 . The metering pump according to  claim 1 , wherein the spring element, in particular the helical spring, is arranged in such a manner that its spring force assists the pumping force required for pumping by virtue of the spring force acting at least partly in the direction of the pumping force. 
     
     
         8 . The metering according to  claim 2 , wherein the metering pump has a pump drive, which is in the form of a linear drive. 
     
     
         9 . The metering according to  claim 2 , wherein one end of the spring element is in electrically conductive contact with the stationary portion, and one end of the spring element is in electrically conductive contact with the pump portion. 
     
     
         10 . The metering according to  claim 3 , wherein one end of the spring element is in electrically conductive contact with the stationary portion, and one end of the spring element is in electrically conductive contact with the pump portion. 
     
     
         11 . The metering pump according to  claim 2 , wherein the spring element is in the form of a helical spring. 
     
     
         12 . The metering pump according to  claim 3 , wherein the spring element is in the form of a helical spring. 
     
     
         13 . The metering pump according to  claim 4 , wherein the spring element is in the form of a helical spring. 
     
     
         14 . The metering pump according to  claim 5 , wherein the spring element, in particular the helical spring, is arranged around at least part of the pump portion. 
     
     
         15 . The metering pump according to  claim 2 , wherein the spring element, in particular the helical spring, is arranged in such a manner that its spring force assists the pumping force required for pumping by virtue of the spring force acting at least partly in the direction of the pumping force. 
     
     
         16 . The metering pump according to  claim 3 , wherein the spring element, in particular the helical spring, is arranged in such a manner that its spring force assists the pumping force required for pumping by virtue of the spring force acting at least partly in the direction of the pumping force. 
     
     
         17 . The metering pump according to  claim 4 , wherein the spring element, in particular the helical spring, is arranged in such a manner that its spring force assists the pumping force required for pumping by virtue of the spring force acting at least partly in the direction of the pumping force. 
     
     
         18 . The metering pump according to  claim 5 , wherein the spring element, in particular the helical spring, is arranged in such a manner that its spring force assists the pumping force required for pumping by virtue of the spring force acting at least partly in the direction of the pumping force. 
     
     
         19 . The metering pump according to  claim 6 , wherein the spring element, in particular the helical spring, is arranged in such a manner that its spring force assists the pumping force required for pumping by virtue of the spring force acting at least partly in the direction of the pumping force.