| 摘要 |
The improved pump drive head ( 1 ) has an integrated stuffing box ( 9 ) and comprises: a power transmission ( 3, 4 ) coupled to the rotating pump driveshaft ( 8 ) within a crude oil well; a stuffing box ( 9 ) to retain the pressure; a thrust assembly ( 6 ) adapted to take the tensile force exerted on said pump shaft. It further has said power transmission comprised of a tube ( 5, 16 ) arranged to be rotated coaxially with the shaft ( 8 ) and having at least two different diameters. The rotary seals ( 20; 50 ) fit over the small outside diameter of the tube to establish fluid-tightness between said tube and the body ( 19 ) of the stuffing box. The working diameter ( 51 ) of the seals ( 20; 50 ) is smaller than the large outside diameter of said tube ( 5, 16 ). Static seals ( 17 ) are provided between the tube and the shaft ( 8 ). Thus, the static seals ( 17 ) and rotary seals ( 20; 50 ) are adapted to come away along with said tube and the retainer ring ( 22 ) for the seals. Advantageously, associated with said head is the improved clamp ( 10 ) for locking the rotary pump driveshaft ( 8 ) in crude oil wells, which clamp includes a jaw pair ( 35, 36 ), a pull one ( 35 ) and a push one ( 36 ) operated by means of a screw ( 38 ) acting with its end on one jaw ( 35 ) and engaging a threaded hole in the other jaw ( 36 ).
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