CN204175541U - The reciprocating electric oil submerged plunger pump of power screw - Google Patents

Abstract

A screw drive reciprocating submersible electric plunger pump, comprising a reciprocating plunger pump lifting short and a cylinder liner connected to it in sequence, a large plunger, a discharge valve assembly, a suction valve assembly, a small plunger, Packing seal assembly and compression plug; the protector includes a protector head, a protector housing, a push-pull rod, an outer guide tube, an inner guide tube and Centralizing sleeve; the head of the screw drive connected to the protector seat and the push-pull rod in turn, the shell of the screw drive, the anti-rotation key of the screw, the outer sleeve of the bearing positioning ring, the long bush, the screw sleeve, the screw, Transmission shaft, screw transmission device seat; the traveling piston assembly includes a traveling piston cylinder liner, a check valve assembly, a traveling piston, and a one-way valve opening trigger support that are sequentially installed and connected with the screw transmission device seat and the spline sleeve Seat, tubing joint hoop. The utility model has the characteristics of high efficiency, long service life, and is suitable for exploiting low productivity wells and inclined wells, and can be widely used in oil exploitation process engineering.

Description

Screw drive reciprocating submersible electric plunger pump

technical field

The utility model relates to a reciprocating oil submersible electric plunger pump for oil mining machinery, in particular to a screw drive reciprocating oil submersible electric plunger pump.

Background technique

Existing oil production equipment suitable for exploiting low-production oil wells includes small oil well pumps, submersible electric diaphragm pumps, and linear motor-driven reciprocating pumps. The oil well pumps of these structures have played a role in oil suction and production. But at the same time, it has the following shortcomings or deficiencies: ①The small oil well pump is a rod pump, which not only has low system efficiency, but also is not suitable for mining in inclined wells; ②The submersible electric diaphragm pump has a short working life and low reliability due to the problem of the diaphragm material ; ③ Linear motor driven reciprocating pump not only has low system efficiency, but also has high cost, which is not suitable for mining in inclined wells.

Contents of the invention

The purpose of this utility model is to provide a screw drive reciprocating electric submersible plunger pump, which can effectively overcome the The disadvantages or deficiencies existing in the above-mentioned prior art are avoided.

The screw drive reciprocating submersible electric plunger pump described in the utility model includes a reciprocating plunger pump and a protector, a screw transmission device, a swimming piston assembly and a switch reluctance submersible motor that are connected and installed in sequence to form an integral body. . The reciprocating plunger pump includes a lifting short and its sequentially installed and connected discharge joint, cylinder liner shell, cylinder liner, large plunger, discharge valve assembly, suction and discharge joint, suction valve assembly, suction bushing, small Plunger, packing seal assembly, compression plug; the protector includes a protector head, a protector housing, a push-pull rod, a retaining ring, and an outer Suspension head of the guide tube, two half rings, outer guide tube, inner guide tube, protector seat, centralizing sleeve; the screw transmission device includes a screw drive device head connected with the protector seat and the push-pull rod in sequence, Screw drive housing, lead screw anti-rotation key, anti-rotation key support, bearing bushing, bearing positioning ring outer casing, bearing positioning half ring, two-way thrust roller bearing, long bushing, screw sleeve, screw, transmission Shaft, screw transmission device seat; the traveling piston assembly includes a traveling piston cylinder liner, a check valve assembly, a traveling piston, and a one-way valve opening trigger Support, tubing section hoop.

Wherein, the discharge joint is connected with the lifting short by a connecting screw. The discharge joint is provided with a drain hole communicating with the cylinder liner shell and the cylinder liner. The suction bush is provided with a suction hole. The suction and discharge joints are provided with seepage holes. The lower end of the push-pull rod is provided with an overflow channel. An overflow hole is opened on the screw sleeve. The one-way valve assembly is installed on the upper and lower ends of the traveling piston. The lower part of the transmission shaft and the upper part of the switched reluctance submersible motor are provided with spline sleeves. A radial bearing is installed between the screw sleeve and the screw transmission seat, and a square key is installed between the screw sleeve and the transmission shaft.

Compared with the prior art, the utility model has the following advantages:

(1) High operating efficiency;

(2) Long working life;

(3) Suitable for exploiting low productivity wells;

(4) Suitable for mining inclined wells.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the utility model.

Detailed ways:

Refer to Fig. 1, a screw drive reciprocating submersible electric plunger pump, including a reciprocating plunger pump and a protector, a screw drive, a traveling piston assembly and a switched reluctance submersible motor that are connected and installed in sequence to form an integral body 46. The reciprocating plunger pump includes a lifting short 1 and its sequentially installed and connected discharge joint 4, a cylinder liner shell 6, a cylinder liner 7, a large plunger 8, a discharge valve assembly 9, a suction and discharge joint 10, and a suction valve assembly 11 , suction bushing 13, small plunger 14, packing seal assembly 16, compression plug 17; the protector includes a protector head 18 connected and installed in turn with the compression plug 17 of the reciprocating plunger pump, and the protector Housing 19, push-pull rod 20, circlip 21, outer guide tube suspension head 22, two half rings 23, outer guide tube 24, inner guide tube 25, protector seat 26, righting sleeve 27; the screw transmission device includes Screw transmission device head 29, screw transmission device housing 30, lead screw anti-rotation key 31, anti-rotation key support 32, bearing bushing 33, bearing positioning ring overcoat connected with protector seat 26 and push-pull rod 20 in sequence 34. Bearing positioning half ring 35, two-way thrust roller bearing 36, long bush 37, screw sleeve 38, lead screw 39, transmission shaft 43, screw transmission device seat 44; the swimming piston assembly includes the screw transmission device seat 44 and the spline sleeve 45 are installed and connected in sequence with the traveling piston cylinder liner 47, the check valve assembly 48, the traveling piston 49, the check valve opening and triggering the support 50, and the oil pipe section hoop.

The discharge joint 4 is connected with the lifting short-circuit 1 by the connecting screw 2 . The drain joint 4 is provided with a drain hole 5 communicating with the cylinder liner shell 6 and the cylinder liner 7 . The suction bush 13 is provided with a suction hole 12 . The suction and discharge joint 10 is provided with seepage holes 15 . The lower end of the push-pull rod 20 is provided with an overflow channel 28 . An overflow hole 40 is provided on the screw sleeve 38 . The one-way valve assembly 48 is installed on the upper and lower ends of the traveling piston 49 . A spline sleeve 45 is installed on the transmission shaft 43 bottom and the switched reluctance submersible motor 46 top. A radial bearing 41 is installed between the screw sleeve 38 and the screw transmission seat 44 , and a square key 42 is installed between the screw sleeve 38 and the transmission shaft 43 . An O-ring 3 is installed at the upper and lower ends of the cylinder liner 7 and at the connection between the discharge joint 4 and the lifting short-circuit 1 .

When the motor was rotating forward, the motor drove the screw sleeve 38 to rotate through the spline sleeve 45 and transmission shaft 43, and the leading screw 39 moved upwards under the drive of the screw sleeve 38. The function of the leading screw anti-rotation key 31 was to prevent the screw 39 from rotating. The push-pull rod 20 connected with the lead screw 31 transmits the power to the small plunger 14 and the large plunger 8, pushing them to move upward. At this time, the suction valve assembly 11 is opened, the discharge valve assembly 9 is closed, and the well fluid passes through the valve assembly 11. The suction hole 12 on the suction bushing 13 enters the lower chamber of the large plunger 8. When the large plunger 8 moves upward to the top dead center position, the reciprocating plunger pump completes the liquid suction process. When the large plunger 8 moves upwards to the vicinity of the top dead center position, the switch reluctance submersible motor 46 is controlled by the ground electrical appliance to make it reverse, and the large plunger 8 and the small plunger 14 are driven by the screw 39 and the push-pull rod 20. At this time, the suction valve assembly 11 is closed, the discharge valve assembly 9 is opened, and the liquid in the lower chamber of the large piston passes through the discharge valve assembly 9, the annular space between the cylinder liner 7 and the cylinder liner shell 6, and the discharge joint The drain hole 5 on the 4 enters the inner chamber of the lifting short 1 and then drains to the ground through the oil pipe connected thereon. When the large plunger 8 moves to the vicinity of the bottom dead center position, the switch reluctance submersible motor 46 is controlled by the ground electrical appliance to make it rotate forward, and the next reciprocating cycle is started.

The protector prevents the well fluid from directly entering the switched reluctance submersible motor and protects the motor. The traveling piston assembly compensates for the volume change of the inner cavity of the screw transmission mechanism caused by the reciprocating movement of the lead screw.

Claims (10)

1. A screw drive reciprocating submersible electric plunger pump, comprising a reciprocating plunger pump and a protector, a screw drive, a swimming piston assembly and a switched reluctance submersible motor that are connected and installed in sequence to form an integral body. It is characterized in that the reciprocating plunger pump includes a lifting short and its sequentially installed and connected discharge joint, cylinder liner shell, cylinder liner, large plunger, discharge valve assembly, suction and discharge joint, suction valve assembly, suction bushing , a small plunger, a packing seal assembly, and a compression plug; the protector includes a protector head, a protector housing, a push-pull rod, and a circlip that are sequentially connected and installed with the compression plug of the reciprocating plunger pump , the suspension head of the outer guide tube, two half rings, the outer guide tube, the inner guide tube, the protector seat, and the centralizing sleeve; the screw transmission device includes a screw drive device connected with the protector seat and the push-pull rod Head, screw transmission housing, lead screw anti-rotation key, anti-rotation key support, bearing bushing, bearing positioning ring outer casing, bearing positioning half ring, double-way thrust roller bearing, long bushing, screw sleeve, screw , transmission shaft, screw transmission device seat; the traveling piston assembly includes a traveling piston cylinder liner, a check valve assembly, a traveling piston, and a one-way valve that are sequentially installed and connected with the screw transmission device seat and the spline sleeve Open the trigger support and the oil pipe joint collar. 2. The screw drive reciprocating submersible electric plunger pump according to claim 1, characterized in that the discharge joint is connected with a lifting short by a connecting screw. 3. The screw drive reciprocating electric submersible plunger pump according to claim 1 or 2, characterized in that the discharge joint is provided with a drain hole communicating with the cylinder liner shell and the cylinder liner. 4. The screw drive reciprocating electric submersible plunger pump according to claim 1, characterized in that the suction bush is provided with a suction hole. 5. The screw drive reciprocating electric submersible plunger pump according to claim 1, characterized in that the suction and discharge joints are provided with seepage holes. 6. The screw drive reciprocating submersible electric plunger pump according to claim 1, characterized in that an overflow channel is provided at the lower end of the push-pull rod. 7. The screw drive reciprocating submersible electric plunger pump according to claim 1, characterized in that an overflow hole is opened on the screw sleeve. 8. The screw drive reciprocating submersible electric plunger pump according to claim 1, characterized in that the check valve assembly is installed at the upper and lower ends of the traveling piston. 9. The screw drive reciprocating submersible electric plunger pump according to claim 1, characterized in that a spline sleeve is installed on the lower part of the transmission shaft and the upper part of the switched reluctance submersible motor. 10. The screw drive reciprocating submersible electric plunger pump according to claim 1, characterized in that a radial bearing is installed between the screw sleeve and the screw transmission seat, and a square bearing is installed between the screw sleeve and the drive shaft. key.