Drill wash device with pre-mounted exchange insert

Abstract

The present invention relates to a drill wash device ( 100 ), the drill wash device comprising a stationary washpipe ( 102 ), a rotating washpipe ( 103 ), a pre-mounted, replaceable exchange insert ( 1 ) for connecting the stationary washpipe ( 102 ) to the rotating washpipe ( 103 ), the exchange insert ( 1 ) comprising a mechanical seal assembly with a stationary seal ring ( 20 ) and a rotating seal ring ( 21 ), and a first adapter ( 108 ) which is arranged between the stationary washpipe ( 102 ) and the exchange insert ( 1 ), wherein the first adapter ( 108 ) comprises a first adjusting mechanism ( 116 ) operative in axial direction for changing an axial length of the first adapter ( 108 ), and wherein the exchange insert ( 1 ) comprises a second adjusting mechanism ( 6 ) operative in axial direction for changing an axial length of the exchange insert ( 1 ).

1 . A drill wash device, comprising:
 a stationary washpipe;   a rotating washpipe;   a pre-mounted, replaceable exchange insert for connecting the stationary washpipe to the rotating washpipe, the exchange insert comprising a mechanical seal assembly with a stationary seal ring and a rotating seal ring, and   a first adapter which is arranged between the stationary washpipe and the exchange insert,   wherein the first adapter comprises a first adjusting mechanism operative in axial direction for changing an axial length of the first adapter; and   wherein the exchange insert comprises a second adjusting mechanism operative in axial direction for changing an axial length of the exchange insert.   
     
     
         2 . The drill wash device according to  claim 1 , wherein the first adjusting mechanism comprises a first screw connection with an outer ring with an internal thread, and an inner ring with an external thread. 
     
     
         3 . The drill wash device according to  claim 2 , wherein the outer ring of the first screw connection comprises first tool recesses on an outer circumferential surface which are configured to receive a tool for rotating the outer ring relative to the inner ring. 
     
     
         4 . The drill wash device according to  claim 1 , wherein the second adjusting mechanism comprises a second screw connection with an external sleeve with an internal thread and an internal sleeve with an external thread. 
     
     
         5 . The drill wash device according to  claim 4 , wherein an axial length of the internal sleeve is greater than an axial length of the external sleeve. 
     
     
         6 . The drill wash device according to  claim 4 , wherein second tool recesses are provided on the internal sleeve on a portion not covered by the external sleeve, for receiving a tool for rotating the internal sleeve relative to the external sleeve. 
     
     
         7 . The drill wash device according to  claim 3 , wherein a geometric shape of the first tool recesses and a geometric shape of the second tool recesses are identical. 
     
     
         8 . The drill wash device according to  claim 1 , wherein at an end directed towards the rotating washpipe the pre-mounted exchange insert comprises a projection protruding in axial direction (X-X) for torque transmission from the rotating washpipe to the exchange insert. 
     
     
         9 . The drill wash device according to  claim 8 , wherein the exchange insert further comprises an aligning ring for aligning the protruding projection in a circumferential direction. 
     
     
         10 . The drill wash device according to  claim 1 , further comprising a second adapter between the rotating washpipe and the exchange insert. 
     
     
         11 . The drill wash device according to  claim 1 , further comprising a mounting aid which is arranged on the stationary washpipe to support assembly and disassembly of the pre-mounted exchange insert. 
     
     
         12 . The drill wash device according to  claim 11 , wherein the mounting aid comprises a first guide arm and a second guide arm which are arranged on the first adapter. 
     
     
         13 . The drill wash device according to  claim 12 , wherein the pre-mounted exchange insert comprises a circumferential groove for engagement with the first and second guide arms. 
     
     
         14 . The drill wash device according to  claim 1 , wherein the second adjusting mechanism comprises an anti-rotation device to fix a relative position between the external sleeve and the internal sleeve. 
     
     
         15 . The drill wash device according to  claim 14 , wherein the anti-rotation device comprises a threaded bolt with a locking element which is spring-loaded on a tip of the threaded bolt and which in a pre-mounted position locks into a first recess on the external sleeve and in an end-mounted position locks into a second recess on the external sleeve.