Polished rod sealing device special for pumping unit

Abstract

The invention relates to a polished rod sealing device special for a pumping unit and mainly solves the existing problems that force is not easy to command, great effort is needed and the adjustable range of a deviation-adjusting device is narrow when carbon fiber packing of a well mouth of a pumping unit is tightened. The polished rod sealing device special for the pumping unit is characterized in that a well sealing rubber gasket (14) is arranged on the inside of the upper part of a lower connector (18), a well sealing pressing cap (12) is arranged at the upper end of the well sealing rubber gasket (14), a well sealing gland (13) is connected to the outside of the upper part of the lower connector (18), and a deviation-adjusting base (10) is arranged on the inside of the upper part of the well sealing gland (13) and is in contact with an above sealing cylinder (7) through a spherical surface; a spiral sealing part (6) is arranged inside the sealing cylinder (7), a pressing block (5), a spring (3) and a thrust bearing (2) are arranged at the upper part of the spiral sealing part (6) sequentially, and the upper part of the thrust bearing (2) is fixed by a pressing cap (1). According to the polished rod sealing device special for the pumping unit, the effort is saved, the force is controllable, the adjustable range of the deviation-adjusting device is wide, and the deviation-adjusting effect is good when the carbon fiber packing is tightened.

Description

technical field [0001] The invention relates to the field of oil fields, in particular to a special polished rod sealing device for pumping units. Background technique [0002] At present, the wellhead seal of the pumping unit mostly adopts the packing seal, and when the packing is worn and tightened, the packing is usually pressed down directly with the pressure cap, and the force of the pressing down is difficult to grasp, and the packing is laborious; Most of the wellhead deviation adjustment devices use ball valves and deviation adjustment bases for deviation adjustment, the adjustable range is small, and the deviation adjustment effect is not good. Contents of the invention [0003] In order to overcome the shortcomings of the existing pumping unit wellhead, such as difficulty in grasping the strength, laboriousness and small adjustable range of the deflection adjustment device when the wellhead of the pumping unit is tightly packed, the present invention provides a s...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of the existing pumping unit wellhead, such as difficulty in grasping the strength, laboriousness and small adjustable range of the deflection adjustment device when the wellhead of the pumping unit is tightly packed, the present invention provides a special polished rod sealing device for the pumping unit. The sealing device is tightly packed, labor-saving and controllable, and the deflection adjustment device has a large adjustable range and good deflection adjustment effect

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