Piston rings for oil field plunger well pumps Dynamic seal plungers with special-shaped opening grooves
A piston ring and open groove technology, which is applied to the parts of the pumping device for elastic fluid, pump components, variable displacement pump parts, etc. Short service life and other problems, to achieve the effect of improving service life, good sealing and reducing reactive wear
Active Publication Date: 2016-06-15
许冲
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Problems solved by technology
[0003] 1. The defect of the soft hydraulic feedback seal structure is that the software and metal parts wear quickly and the service life is short
[0004] 2. The elastic metal ring seal structure can solve the sealing problem between the pump barrel and the plunger, but the metal seal ring is always in contact with the pump barrel during the movement of the plunger's up and down strokes, which greatly reduces the metal seal. The service life of the ring, the failure rate is relatively high
Method used
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Embodiment Construction
[0017] Such as figure 1 , figure 2 , image 3 Shown: a dynamic sealing plunger with a special-shaped opening groove for the piston ring of a plunger oil well pump in an oil field. Cover 4, sealing sleeve 5 and lower compensation sleeve 8. A piston ring 6 is set on the outer pipe wall of the sealing sleeve 5 . Described piston ring 6 is a steel rectangular ring, cut opening groove 6-1 on the busbar of rectangular ring; There are many piston rings 6, and many piston rings 6 are arranged without gaps successively; The outer cylindrical surface of piston ring and The inner wall of the pump cylinder 13 is a sealing surface. The upper end of the upper compensation sleeve 4 is connected and locked with the central pipe 1 through the upper guide sleeve 2 . The lower end of the lower compensation sleeve 8 is connected and locked with the central pipe 1 through the lower guide sleeve 9 . A floating valve ball 10 and a floating valve seat 11 are installed in the inner hole of the ...
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The invention discloses a dynamic sealing plunger with a special-shaped opening groove in a piston ring of an oil field plunger pump, and relates to oil production equipment. The dynamic seal combination plunger assembly includes: upper compensation sleeve, sealing sleeve and lower compensation sleeve. A plurality of piston rings are set on the outer pipe wall of the sealing sleeve, and an O-shaped sealing ring is installed in the piston rings. When the plunger moves from the top dead center to the bottom dead center, the pressure difference between the top and bottom of the plunger gradually disappears, that is, the pressure on the sealing section of the plunger gradually decreases until it disappears, and the sealing section is in a retracted state, which reduces the working friction of the down stroke and improves The service life of the metal seal ring. The function of the involute notch is to increase the length of the notch, reduce oil leakage, and seal better. The function of the fan-shaped notch is to facilitate the unrestricted opening of the opening groove, and at the same time, the involute-shaped notch will not be damaged after the piston ring is worn for a long time. The opening grooves on two adjacent piston rings are misaligned by 180 degrees in the circumferential direction, which increases the sealing effect at the opening of the sealing ring.
Description
technical field [0001] The invention relates to an oil production equipment used in an oil field, in particular to a dynamic sealing plunger with a special-shaped opening groove in a piston ring of an oil field plunger pump. Background technique [0002] In the existing oil field mechanical lifting oil production, the utilization rate of the plunger oil well pump accounts for the majority, and during the oil pumping process of the plunger oil well pump, there is rigid friction between the plunger and the pump barrel, and the sealing performance of the plunger oil well pump cannot be guaranteed. Cooperating with the reciprocating motion of the pumping unit, its sealing performance tends to decrease gradually; especially in heavy oil, oil wells with a lot of sand in the oil, and polymer-containing oil wells, the leakage of the plunger pump will decrease with the increase of time and wear. The amount gradually increases, resulting in low pump efficiency and increased idle power...
Claims
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IPC IPC(8): F04B53/14
Inventor 许冲张兴明
Owner 许冲