| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint structure of a shunt tube screen capable of efficiently connecting a screen when gravel of different types must be supplied through a shunt tube. SOLUTION: In this joint structure of the shunt tube screen, when a tightening torque reaches a pre-set value when the base pipe 3 of either of the upper and lower screens is threaded to a coupling 11 by the rotation of the upper screen 2', the upper end face of a packing 12 fixed to the shunt tube 8 of the lower screen is allowed to abut on the lower end face of the shunt tube 8 of the upper screen 2' by longitudinally arranging the shunt tube 8 of the lower screen 2 and the shunt tube 8 of the upper screen 2' and preventing a clearance from occurring between the both arranged shunt tubes 8 and 8. COPYRIGHT: (C)2005,JPO&NCIPI
|
