Screw drive long-stroke pumping unit

Abstract

The utility model discloses a spiral transmission long stroke pumping unit, which comprises a motor, a box body, a hydraulic motor, a fixed pulley block, a movable pulley block and a transmission structure, the transmission structure comprises a first gear, a second gear and a third gear, and both the first gear and the third gear are meshed with the second gear. The first shaft fixedly provided with the first gear is connected with a shaft of the motor. An external thread of the lead screw and a middle threaded hole of the second gear form a screw pair, three movable pulleys of the movable pulley block are connected with a cross beam fixedly connected with the lower end of the lead screw through pin shafts, and two fixed pulleys of the fixed pulley block are connected with the base through pin shafts. And the other end is connected with the sucker rod after bypassing the fixed pulley block and the movable pulley block. Single-stage speed reduction that the first gear drives the second gear is adopted, so that the occupied area is saved, and the energy consumption is reduced; the long stroke of the pumping unit is achieved through the fixed pulley block and the movable pulley block, and the efficiency of the pumping unit is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to oilfield production equipment field, especially a spiral transmission long-stroke pumping unit. BACKGROUND

[0002] Beam pumping unit is the oilfield widely used production equipment at present, and the working principle of beam pumping unit is through the power supply of motor, and through the belt transmission, two-stage gear reducer converts high-speed rotation into low-speed rotation, and then through the crank connecting rod mechanism, the rotation is changed into the up-down reciprocating motion of the sucker rod, so that the plunger of the sucker rod drives the sucker rod to make up-down reciprocating motion, thereby pumping the crude oil in the well to the ground. Because beam pumping unit adopts three-stage speed reducer device of belt transmission and two-stage gear reducer, not only the land occupation is large, but also the transmission link is more and the energy consumption is high. SUMMARY

[0003] In order to solve the problems in the above background technology existing in the prior art beam pumping unit, the utility model provides a spiral transmission long-stroke pumping unit.

[0004] The utility model discloses a technical scheme that solves the above technical problem is: a screw drive long stroke pumping unit, including motor, box, hydraulic motor, fixed pulley group, movable pulley group and transmission structure, the transmission structure includes first gear, second gear and third gear, first gear with second gear all with third gear are engaged, first gear with second gear with third gear all are located in the cavity of box, first gear is fixedly installed on the first shaft, and the first shaft is rotatably supported on the box, and one end of the first shaft that stretches out the box is connected with the shaft of motor through first coupling, third gear is fixedly installed on the second shaft, and the second shaft is rotatably supported on the box, and one end of the second shaft that stretches out the box is connected with the shaft of hydraulic motor through second coupling, the high pressure oil port of hydraulic motor is linked together with the oil delivery port of hydraulic accumulator, and the low pressure oil port of hydraulic motor is linked together with the oil tank, and the hydraulic accumulator and the oil tank are fixedly installed on the box, first sleeve and second sleeve are fixedly connected with the upper and lower end surface of second gear respectively, first sleeve with second sleeve all are rotatably supported on the box, and the middle part of second gear is provided with the threaded hole with internal thread, and the middle part of first sleeve and second sleeve is provided with through-hole, the lead screw with external thread passes through the middle part through-hole of first sleeve, the middle part threaded hole of second gear and the middle part through-hole of second sleeve in proper order, and the inner diameter of first sleeve middle part through-hole and the inner diameter of second sleeve middle part through-hole are all greater than the major diameter of the lead screw external thread, and the lead screw external thread and the middle part threaded hole of second gear constitute screw pair, the upper end of lead screw is fixedly installed with the blocking ring, and the lower end of lead screw is fixedly installed with crossbeam, movable pulley group includes first movable pulley, second movable pulley and third movable pulley, first movable pulley with second movable pulley with third movable pulley all are connected with crossbeam through pin shaft, and fixed pulley group includes first fixed pulley and second fixed pulley, and first fixed pulley with second fixed pulley all are connected with base through pin shaft, one end of steel wire rope is fixed on the base, and the other end is connected with pumping rod after passing through fixed pulley group and movable pulley group, and the box is fixedly installed on the frame.

[0005] Preferably, the inner diameter of the first sleeve middle part through-hole and the inner diameter of the second sleeve middle part through-hole are same.

[0006] Preferably, the number of teeth of the first gear and the number of teeth of the third gear are less than the number of teeth of the second gear.

[0007] Compared with the prior art, the utility model has the beneficial effects that:

[0008] (1) adopting single-stage reduction of first gear driving second gear, so not only the floor area is saved, but also the energy consumption is reduced because of the reduction of transmission link.

[0009] (2) the long stroke of the pumping unit is realized by using the fixed pulley set and the movable pulley set, and the efficiency of the pumping unit is improved. Because the movable pulley set includes three movable pulleys, i.e. the first movable pulley, the second movable pulley and the third movable pulley, and the fixed pulley set includes two fixed pulleys, i.e. the first fixed pulley and the second fixed pulley, the distance of the movement of the pumping rod in the up and down stroke, i.e. the stroke of the pumping unit, is 6 times of the distance of the movement of the screw in the up and down stroke, so that the pumping unit obtains the long stroke, and the efficiency of the pumping unit is improved. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is a structural schematic view of the utility model;

[0011] Figure 2 It is a movement direction schematic view of each component in the down stroke of the utility model;

[0012] Figure 3 It is a movement direction schematic view of each component in the up stroke of the utility model.

[0013] In the drawing: 1, electric motor; 2, box body; 3, hydraulic motor; 4, first gear; 5, second gear; 6, third gear; 7, first shaft; 8, first coupling; 9, second shaft; 10, second coupling; 11, hydraulic accumulator; 12, oil tank; 13, first sleeve; 14, second sleeve; 15, screw; 16, blocking ring; 17, crossbeam; 18, first movable pulley; 19, second movable pulley; 20, third movable pulley; 21, first fixed pulley; 22, second fixed pulley; 23, base; 24, steel wire rope; 25, pumping rod; 26, frame. DETAILED DESCRIPTION

[0014] The preferred embodiments of the utility model are described in detail below in combination with the drawings.

[0015] Referring to Figure 1The screw transmission long stroke pumping unit comprises a motor 1, a box 2, a hydraulic motor 3, a fixed pulley set, a movable pulley set and a transmission structure, the transmission structure comprises a first gear 4, a second gear 5 and a third gear 6, the first gear 4 and the third gear 6 are engaged with the second gear 5, and the first gear 4, the second gear 5 and the third gear 6 are located in a cavity of the box 2. The first gear 4 is fixedly installed on a first shaft 7, the first shaft 7 is rotatably supported on the box 2, and an end of the first shaft 7 extending out of the box 2 is connected with a shaft of the motor 1 through a first coupling 8. The third gear 6 is fixedly installed on a second shaft 9, the second shaft 9 is rotatably supported on the box 2, and an end of the second shaft 9 extending out of the box 2 is connected with a shaft of the hydraulic motor 3 through a second coupling 10. A high-pressure oil port of the hydraulic motor 3 is in communication with an oil outlet of a hydraulic accumulator 11, and a low-pressure oil port of the hydraulic motor 3 is in communication with an oil tank 12, and the hydraulic accumulator 11 and the oil tank 12 are fixedly installed on the box 2. A first sleeve 13 and a second sleeve 14 are fixedly connected with upper and lower end faces of the second gear 5 respectively, the first sleeve 13 and the second sleeve 14 are rotatably supported on the box 2, a threaded hole with internal threads is arranged in a middle portion of the second gear 5, and through holes are arranged in middle portions of the first sleeve 13 and the second sleeve 14. A threaded rod 15 with external threads passes through the middle through hole of the first sleeve 13, the middle threaded hole of the second gear 5 and the middle through hole of the second sleeve 14 in sequence, the internal diameters of the middle through hole of the first sleeve 13 and the middle through hole of the second sleeve 14 are greater than the major diameter of the external threads of the threaded rod 15, the external threads of the threaded rod 15 and the middle threaded hole of the second gear 5 form a screw pair, a stop ring 16 is fixedly installed on an upper end of the threaded rod 15, and a cross beam 17 is fixedly installed on a lower end of the threaded rod 15. The movable pulley set comprises a first movable pulley 18, a second movable pulley 19 and a third movable pulley 20, the first movable pulley 18, the second movable pulley 19 and the third movable pulley 20 are connected with the cross beam 17 through pin shafts, the fixed pulley set comprises a first fixed pulley 21 and a second fixed pulley 22, the first fixed pulley 21 and the second fixed pulley 22 are connected with a base 23 through pin shafts. One end of a steel wire rope 24 is fixed on the base 23, the other end of the steel wire rope 24 passes through the fixed pulley set and the movable pulley set and is connected with a sucker rod 25. The box 2 is fixedly installed on a frame 26.

[0016] The internal diameters of the middle through hole of the first sleeve 13 and the middle through hole of the second sleeve 14 are the same in the embodiment; the number of teeth of the first gear 4 and the number of teeth of the third gear 6 are less than the number of teeth of the second gear 5.

[0017] As Figure 2As shown, during the downstroke, the motor 1 rotates clockwise (as viewed from the side opposite the motor output shaft end), the motor 1 drives the first gear 4 to rotate clockwise through the first coupling 8, and the first gear 4 drives the second gear 5 to rotate counterclockwise. The sucker rod 25 moves downward under the action of its own gravity, at which time the gravity of the sucker rod 25 is the driving force, the sucker rod 25 drives the cross beam 17 and the lead screw 15 to move downward through the steel wire rope 24, the fixed pulley block and the movable pulley block, and the downward moving lead screw 15 drives the second gear 5 to rotate counterclockwise through the screw pair composed of the external thread of the lead screw 15 and the middle threaded hole of the second gear 5. That is, the gravity of the sucker rod 25 drives the second gear 5 to rotate counterclockwise together with the motor 1. The second gear 5 drives the third gear 6 to rotate clockwise, and the third gear 6 drives the hydraulic motor 3 to operate in the pump working condition through the second coupling 10, so that the hydraulic oil in the oil tank 12 is pressed into the hydraulic accumulator 11 to be stored, that is, the gravitational potential energy released by the sucker rod 25 is converted into hydraulic energy stored in the hydraulic accumulator 11.

[0018] As shown in the figure, Figure 3 during the upstroke, the motor 1 rotates counterclockwise, the motor 1 drives the first gear 4 to rotate counterclockwise through the first coupling 8, and the first gear 4 drives the second gear 5 to rotate clockwise. At this time, the hydraulic accumulator 11 releases the energy recovered during the downstroke to the hydraulic motor 3, the hydraulic energy in the hydraulic accumulator 11 drives the hydraulic motor 3 to operate in the motor working condition, and then drives the third gear 6 to rotate counterclockwise through the second coupling 10, and the third gear 6 drives the second gear 5 to rotate clockwise. That is, the energy of the motor 1 and the energy from the hydraulic accumulator 11 together drive the second gear 5 to rotate clockwise, realizing the recycling of the gravitational potential energy of the sucker rod 25. Then, the second gear 5 drives the lead screw 15 to move upward through the screw pair composed of the external thread of the lead screw 15 and the middle threaded hole of the second gear 5. The lead screw 15 drives the cross beam 17 to move upward, and then drives the sucker rod 25 to move upward through the steel wire rope 24, the fixed pulley block and the movable pulley block.

[0019] The existing beam-type pumping unit adopts a three-stage speed reduction device of a belt drive and a two-stage gear reducer, while the utility model adopts single-stage speed reduction of the first gear 4 driving the second gear 5, so that not only the floor area is saved, but also the energy consumption is reduced due to the reduction of the transmission links.

[0020] In another aspect, the utility model discloses utilize fixed pulley set and movable pulley set to realize the long stroke of pumping unit, improve the efficiency of pumping unit. Because movable pulley set includes first movable pulley 18, second movable pulley 19 and third movable pulley 20 total three movable pulleys, fixed pulley set includes first fixed pulley 21 and second fixed pulley 22 total two fixed pulleys, so the distance of the movement of pumping rod 25 up and down stroke, that is, the stroke of pumping unit, is the distance of the movement of screw 15 up and down stroke 6 times, thereby make pumping unit obtain long stroke, improve the efficiency of pumping unit.

[0021] The above only is the preferred embodiment of the utility model, and does not use to limit the utility model, and any modification, equivalent replacement, improvement etc. that is made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A screw drive long stroke pumping unit characterized by, The utility model relates to a kind of hydraulic hoist, including motor (1), box (2), hydraulic motor (3), fixed pulley group, movable pulley group and transmission structure, the transmission structure includes first gear (4), second gear (5) and third gear (6), the first gear (4) and the third gear (6) are engaged with the second gear (5), the first gear (4), the second gear (5) and the third gear (6) are located in the cavity of the box (2);The first gear (4) is fixedly installed on first shaft (7), the first shaft (7) is rotatably supported on the box (2), the first shaft (7) one end that protrudes from the box (2) is connected with the shaft of the motor (1) by first coupling (8);The third gear (6) is fixedly installed on second shaft (9), the second shaft (9) is rotatably supported on the box (2), the second shaft (9) one end that protrudes from the box (2) is connected with the shaft of the hydraulic motor (3) by second coupling (10);The high-pressure oil port of the hydraulic motor (3) is communicated with the oil delivery port of hydraulic accumulator (11), the low-pressure oil port of the hydraulic motor (3) is communicated with oil tank (12), the hydraulic accumulator (11) and the oil tank (12) are fixedly installed on the box (2);First sleeve (13) and second sleeve (14) are fixedly connected with the upper and lower end surfaces of the second gear (5) respectively, the first sleeve (13) and the second sleeve (14) are rotatably supported on the box (2), the middle part of the second gear (5) is provided with threaded hole with internal thread, the middle part of the first sleeve (13) and the second sleeve (14) is provided with through hole;Lead screw (15) with external thread passes through the middle through hole of the first sleeve (13), the middle threaded hole of the second gear (5) and the middle through hole of the second sleeve (14) in sequence, the inner diameter of the first sleeve (13) middle through hole and the inner diameter of the second sleeve (14) middle through hole are all greater than the major diameter of the external thread of the lead screw (15), the external thread of the lead screw (15) and the middle threaded hole of the second gear (5) form screw pair, the upper end of the lead screw (15) is fixedly installed with stop ring (16), the lower end of the lead screw (15) is fixedly installed with crossbeam (17);The movable pulley group includes first movable pulley (18), second movable pulley (19) and third movable pulley (20), the first movable pulley (18), the second movable pulley (19) and the third movable pulley (20) are connected with the crossbeam (17) by pin shaft, the fixed pulley group includes first fixed pulley (21) and second fixed pulley (22), the first fixed pulley (21) and the second fixed pulley (22) are connected with base (23) by pin shaft;One end of steel wire rope (24) is fixed on the base (23), and the other end is connected with sucker rod (25) after passing through fixed pulley group and movable pulley group;The box (2) is fixedly installed on rack (26).

2. A screw drive long stroke pumping unit according to claim 1, characterized in that The inner diameter of the middle through hole of the first sleeve (13) is the same as the inner diameter of the middle through hole of the second sleeve (14).

3. A helical drive long stroke pumping unit as set forth in claim 1, characterized in that, The number of teeth of the first gear (4) and the number of teeth of the third gear (6) are both less than the number of teeth of the second gear (5).

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