Reverse Rotation Protection For Borehole Pumps

Abstract

A reverse rotation protection for borehole pumps is disposed in a drive head. The reverse rotation protection includes a housing and a clamping tool for securing a polished rod. The clamping tool includes at least two exchangeable contact elements with which the polished rod can be fixed releasably.

1 . A reverse rotation protection for a borehole pump, wherein the reverse rotation protection is disposed in a drive head, wherein the reverse rotation protection comprises a housing and a clamping tool for securing a polished rod, characterised in that the clamping tool comprises at least two exchangeable contact elements, with which the polished rod can be fixed releasably. 
     
     
         2 . The reverse rotation protection according to  claim 1 , characterised in that the contact elements are each introduced releasably into a holding fixture. 
     
     
         3 . The reverse rotation protection according to  claim 1 , characterised in that each contact element is connected to the holding fixture by means of at least one screw. 
     
     
         4 . The reverse rotation protection according to  claim 3 , characterised in that the contact elements are produced from a non-sparking and pressure-resistant material. 
     
     
         5 . The reverse rotation protection according to  claim 1 , characterised in that the clamping tool can be adapted to diameters of different rods by means of contact elements of differing size. 
     
     
         6 . The reverse rotation protection according to  claim 1 , characterised in that the holding fixture is provided, on the side lying opposite the contact element, with a groove for receiving a setscrew. 
     
     
         7 . The reverse rotation protection according to  claim 6 , characterised in that the holding fixtures are movable inside the housing by means of the setscrews. 
     
     
         8 . The reverse rotation protection according to  claim 1 , characterised in that each setscrew is provided with a cap on the side facing away from the holding fixture. 
     
     
         9 . The reverse rotation protection according to  claim 8 , characterised in that the caps are fitted on the setscrews when the contact elements are not in contact with the polished rod. 
     
     
         10 . The reverse rotation protection according to  claim 8 , characterised in that the caps are provided with contacts, which display a relaxation state of the reverse rotation protection. 
     
     
         11 . The reverse rotation protection according to  claim 8 , characterised in that the caps are in contact, in each case via a connecting cable, with a control which prevents the borehole pump from starting up in the absence of a signal.