CN2421427Y - Gap compensated self-sealed oil pump - Google Patents

Abstract

The utility model relates to a gap compensating type self-sealed oil pump which is used for the exploitation of an oil well, particularly the exploitation of an oil well which has high water containing amount, or liquid generated by the oil well has strong corrosiveness. The utility model is composed of a pump barrel upper joint 1, a pump barrel lower joint 4, a pump barrel 2, a plunger 3, a fixing valve cover 5, a ball 6, a seat 7 and a fixing valve lower joint 8, wherein, the plunger 3 is composed of an oil outlet valve cover 9, a ball 10, a seat 11, an upper press ring 13, a lower press ring 16, a piston ring 14, a supporting ring 15, a pretightening spring 17, a piston rod 18, a traveling valve cover 20, a ball 21, a seat 22, an upper joint 12, a middle joint 19 and a lower joint 23. The oil pump can cause the conical part of the piston ring to be expanded and deformed to accomplish gap compensation and self seal in a multi-stage mode. The utility model can ensure the high pumping efficiency under complicated oil and operating conditions. The utility model prolongs the service life, reduces work, and improves the production conditions of an oil pumping well.

Description

Clearance compensation type selfsealings oil well pump

The utility model relates to a kind of down-hole oil rig that is used for the particularly high moisture or oil mining that the output corrosion is stronger of oil mining.

The gap compensation and the selfsealings of oil pump plunger piston are significant to oil well pump proper functioning and pump efficiency height thereof.At present, on-the-spot oil well pump common metal plunger gap of using can not compensate, and adopt nonmetal soft seal bowl usually as gap compensation and selfsealings workpiece, that its shortcoming is is high temperature resistant, wear-resistant, decay resistance is relatively poor, cause the oil well pump pump efficiency low, working life is short, and operation is frequent, and the oil well ordinary production is caused adverse effect with reducing cost.

The purpose of this utility model is to provide a kind of common metal plunger and nonmetal soft sealing plunger oil well pump advantage of integrating, and has the good gap compensation and the clearance compensation type selfsealings oil well pump of selfsealings performance again.

The utility model is to realize like this.This kind oil well pump is by on the pump barrel, lower contact, pump barrel, plunger, the standing valve cover, the standing valve ball, the standing valve seat, the standing valve lower contact is formed, its characteristics are, plunger wherein is by fuel-displaced valve cover, ball, seat, on, following pressure ring, piston ring (packing), support ring, preloading spring, piston rod, the travelling valve cover, ball, seat and last, in, following three joints are formed, constitute the structure of each component of plunger, assembled relation is as follows: upper connection upper end external screw thread is connected with the piston rod upper end with fuel-displaced valve cover lower end respectively with the lower end female thread, on the middle joint, the lower end female thread is connected with travelling valve cover upper end with piston-rod lower end respectively, and travelling valve cover lower end female thread is connected with the lower contact upper end; Be respectively equipped with fuel-displaced valve ball, seat and travelling valve ball, seat in fuel-displaced valve cover and the travelling valve cover, piston rod is set with upper press ring, piston ring (packing), support ring, following pressure ring and preloading spring outward from top to bottom successively.This oil well pump working procedure is as follows: when sucker rod up, be that oil pump plunger piston is when being upstroke, standing valve is opened, travelling valve is closed, fuel-displaced valve cover on the plunger, piston rod, the travelling valve cover and therebetween on, in, lower contact constitutes an integral body, move upward from the pump barrel lower end with certain speed, liquid in the pump barrel is pushed to pump barrel top with plunger, and it is relative very little to the liquid measure that cavity of resorption spills by pump barrel with the plunger gap, make the fluid pressure that end pressure only flows to pump barrel for the oil well bottom under the plunger, the end-beveling of upper connection is guided the liquid of pump barrel epicoele into upper press ring, like this on the isolated pump barrel of upper press ring and middle joint, form big pressure reduction between the cavity of resorption, thereby on the upper press ring circular crosssection, produce very big end thrust.This end thrust is by upper press ring, and piston ring, support ring, pressure ring, preloading spring are delivered on the piston rod supporting step down, and preloading spring is stressed to be compressed to down the step that pressure ring is pressed onto piston rod, and upper press ring, piston ring, support ring continue to move downward.At this moment, because pressure ring has been blocked down, under upper press ring, support ring and the effect of following pressure ring wedge awl, piston ring is subjected to radial component and distending, and its outer wall compresses pump barrel, makes to keep very little gap between plunger and the pump barrel, stops the leakage of liquid.In said process, but but the selfsealings of plunger are to lean on the tapering part of the piston ring of multistage distending compression deformation diametrically to realize.The distortion of piston ring tapering part is compensated the plunger gap automatically, can realize the zero clearance sealing.When sucker rod is descending is that oil pump plunger piston is when being down stroke, standing valve is closed, travelling valve is opened, plunger moves downward from the pump barrel upper end with certain speed, on the plunger, cavity of resorption liquid is communicated with by the hollow passageway of piston rod, like this, on the pump barrel, pressure reduction between the cavity of resorption has not existed, thereby the end thrust on the upper press ring circular crosssection disappears, and piston ring is made radial contraction under the effect of its elastic restoring force, make piston outer wall leave pump barrel, simultaneously, the axial thrust load of piston ring elastic restoring force and preloading spring promote upper press ring, support ring and following pressure ring set back, and have big gap between plunger and the pump barrel, to reduce the descending resistance of plunger.

The utility model modern design, rational in infrastructure, have good gap compensation and selfsealings performance, thereby under various complicated oil products, operating mode, all can guarantee higher pump efficiency, and increase the service life, reduce operation, improve the exploitation effect and the production status of pumping well, be suitable for and apply.

Fig. 1 is a general structure schematic representation of the present utility model.

Fig. 2 is plunger 3 structural representations.

Below in conjunction with accompanying drawing enforcement of the present utility model is described further.

As shown in Figure 1, the utility model is made up of the upper and lower joint 1,4 of pump barrel, pump barrel 2, plunger 3, standing valve cover 5, standing valve ball 6, standing valve seat 7 and standing valve lower contact 8; As shown in Figure 2, plunger 3 is made up of fuel-displaced valve cover 9, fuel-displaced valve ball 10, fuel-displaced valve seat 11, upper and lower pressure ring 13,16, piston ring (packing) 14, support ring 15, preloading spring 17, piston rod 18, travelling valve cover 20, travelling valve ball 21, travelling valve seat 22 and upper, middle and lower joint 12,19,23.Wherein, upper connection 12 upper and lower ends are respectively equipped with external screw thread and the female thread that matches with fuel-displaced valve cover 9 and piston rod 18, and the lower end periphery is made 30-45 ° of chamfering.Piston ring 14 soft metal copper alloy made, its quantity are the 3-9 level, and each grade piston ring height is 30-50mm, and wall thickness 3-5mm, upper/lower terminal inner headed face make 40-60 ° interior cone angle.Upper and lower pressure ring 13,16 periphery the inners be respectively equipped with piston ring two ends therebetween in the key groove that matches of cone angle.Bloats in the middle of support ring 15 peripheries, middle bellying is upper and lower make respectively with piston ring in the wedge shape that matches of cone angle.Preloading spring 17 adopts the spring that the cross section is rectangular, internal diameter matches with piston rod.Piston rod 18 is the hollow stem that a upper and lower end is respectively equipped with the external screw thread that matches with upper connection 12 and middle joint 19, the step of pressure ring 16 and preloading spring 17 under its top, screw thread position, lower end is provided with and supports.

Claims (5)

1, a kind of clearance compensation type selfsealings oil well pump, on pump barrel, lower contact (1), (4), pump barrel (2), plunger (3), standing valve cover (5), standing valve ball (6), standing valve seat (7) and standing valve lower contact (8) are formed, it is characterized in that: plunger wherein (3) is by fuel-displaced valve cover (9), fuel-displaced valve ball (10), fuel-displaced valve seat (11), on, following pressure ring (13), (16), piston ring (14), support ring (15), preloading spring (17), piston rod (18), travelling valve cover (20), travelling valve ball (21), travelling valve seat (22) and last, in, lower contact (12), (19), (23) form, its structure, assembled relation is as follows: upper connection (12) upper end external screw thread is connected with piston rod (18) upper end with fuel-displaced valve cover (9) lower end respectively with the lower end female thread, on the middle joint (19), the lower end female thread is connected with travelling valve cover (20) upper end with piston rod (18) lower end respectively, and travelling valve cover (20) lower end screw thread is connected with lower contact (23) upper end; Be respectively equipped with fuel-displaced valve ball (10), seat (11) and travelling valve ball (21), seat (22) in fuel-displaced valve cover (9) and the travelling valve cover (20), outer upper press ring (13), piston ring (14), support ring (15), following pressure ring (16) and the preloading spring (17) of being set with successively of piston rod (18) from top to bottom.

2, clearance compensation type selfsealings oil well pump according to claim 1 is characterized in that, piston ring (14) is used copper alloy made, and its quantity is the 3-9 level, and each grade ring inner headed face upper and lower end is provided with 40 °-60 ° interior cone angle.

3, clearance compensation type selfsealings oil well pump according to claim 1 is characterized in that, upper and lower pressure ring (13), (16) periphery the inner be respectively equipped with the piston ring two ends in the key groove that matches of cone angle.

4, clearance compensation type selfsealings oil well pump according to claim 1 is characterized in that, bloats in the middle of support ring (15) periphery, bloat the position upper and lower make respectively with piston ring in the wedge shape that matches of cone angle.

5, clearance compensation type selfsealings oil well pump according to claim 1 is characterized in that, piston rod (18) is the hollow stem that a upper and lower end is respectively equipped with the external screw thread that matches with joint (12), (19), and its top, screw thread position, lower end is provided with two steps.

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