Energy-saving pumping unit

Abstract

The invention discloses an energy-saving oil pumping unit, and relates to the technical field of oil pumping units. The driving assembly and the walking beam form a crank rocker mechanism, in the swinging process of the walking beam, the point positions of the force acting on the walking beam by a crank of the driving assembly are different, the force arm of the crank changes continuously, the load of the horse head is an alternating load, the balance assembly and a first balancing weight on the crank have the balance effect on the walking beam and the horse head, and therefore the horse head can be balanced. The static torque curve fluctuation quantity of the balanced crankshaft is small, so that the heat loss work of the driving assembly is small; the balance assembly comprises a second driving mechanism, a second balancing weight and a swing rod. The second driving mechanism drives the swing rod to rotate relative to the walking beam, and the torque acting on the walking beam by the second balancing weight and the swing rod can counteract the torque generated by the horse head relative to the rack assembly to a certain extent, so that the force required by rotation of the walking beam is reduced; the power generation assembly can convert mechanical energy of rotation of the walking beam into electric energy and supply the electric energy to the second driving mechanism, and the energy utilization rate is increased.

Description

Technical Field

[0001] The invention relates to the technical field of oil pumping units, and in particular to an energy-saving oil pumping unit. Background Art

[0002] The pumping unit is composed of an electric motor, a reducer and a four-bar linkage (including a crank, a connecting rod and a walking beam). It is a mechanical device that converts the continuous circular motion of the prime mover into reciprocating linear motion, and drives the pumping pump to pump oil through the sucker rod. The pumping unit in the prior art is usually a conventional walking beam pumping unit, but this type of oil extraction equipment has low efficiency and high energy consumption.

[0003] The information disclosed in the background technology section of this application is only intended to deepen the understanding of the general background technology of this application, and should not be regarded as an admission or any form of implication that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0004] The main purpose of the present invention is to provide an energy-saving oil pumping unit, aiming to solve the technical problem of high energy consumption of the existing beam pumping unit.

[0005] To achieve the above object, the present invention provides an energy-saving oil pumping unit, comprising: Rack components; A walking beam, the walking beam is rotatably connected to the frame assembly at point A, and one end of the walking beam is connected to a donkey head; The driving assembly comprises a first driving mechanism, a crank, a slider and a first counterweight; the first driving mechanism is arranged on the frame assembly and is used to drive the crank to rotate; one end of the crank is connected to the first counterweight, and the other end of the crank is rotatably connected to the slider; the slider is slidably arranged on the rocker and is located between point A and the donkey head; A balancing assembly comprises a swing rod, a second counterweight and a second driving mechanism; one end of the swing rod is rotatably connected to the rocker, and the other end of the swing rod is connected to the second counterweight; the second driving mechanism is used to drive the swing rod to rotate relative to the rocker; point A is located between the slider and the swing rod; A power generation assembly, comprising a first connecting rod, a second connecting rod, a ratchet, a pawl, an elastic pressing plate and a power generation unit; one end of the first connecting rod is rotatably connected to the walking beam, and the other end of the first connecting rod is rotatably connected to the second connecting rod; the second connecting rod is rotatably connected to the ratchet, and the second connecting rod is also connected to the pawl and the elastic pressing plate, wherein the pawl is rotatably connected to the second connecting rod, and the elastic pressing plate is used to compress the pawl to cooperate with the ratchet; the power generation unit is used to convert the mechanical energy of the ratchet rotation into electrical energy; The electronic control component includes a sensor unit and a processor, wherein the first driving mechanism, the second driving mechanism, the power generation unit and the sensor unit are all electrically connected to the processor; the sensor unit is used to detect the position of the donkey head; and the electric energy generated by the power generation unit is used to drive the second driving mechanism.

[0006] Furthermore, the second driving mechanism includes a first rotating wheel, a second rotating wheel, a first transmission member and a balancing motor; the balancing motor is arranged on the rocker arm and is used to drive the first rotating wheel to rotate; one end of the rocker arm is connected to the second rotating wheel, and the second rotating wheel is rotatably connected to the rocker arm; the first transmission member is used to transmit the power of the first rotating wheel to the second rotating wheel.

[0007] Furthermore, the balancing assembly also includes a connecting plate, a first gear, a second gear, a variable diameter motor and a plurality of sliding members; the connecting plate is fixed on the first rotating wheel and is provided with a plurality of radial grooves along the circumference of the connecting plate; the sliding member is slidably arranged in the radial groove, a bent plate is provided at one end of the sliding member, and a connecting block is provided at the other end of the sliding member; the variable diameter motor is fixed on the connecting plate and is used to drive the first gear to rotate; the second gear is rotatably connected to the connecting plate and the second gear is meshed with the first gear; a plurality of guide holes cooperating with the connecting block are provided on the circumference of the second gear; when the second gear rotates, the connecting block slides along the guide hole, so that the sliding member moves along the radial groove away from or close to the center of the connecting plate; the outer contours of the plurality of bent plates form a variable diameter wheel, and the first transmission member is transmission-connected to the variable diameter wheel.

[0008] Furthermore, the balancing assembly also includes a mounting plate and a first tensioning wheel; the mounting plate is arranged on the walking beam; the first rotating wheel and the first tensioning wheel are both rotatably connected to the mounting plate; the first transmission member is sleeved on the outer side of the bending plate, the first tensioning wheel and the second rotating wheel.

[0009] Furthermore, it also includes a traction assembly and a limiting assembly; the traction assembly includes a first wheel, a second wheel, a third wheel and a traction rope; the donkey head is rotatably connected to the rocker; the limiting assembly is used to limit the rotation angle α of the donkey head relative to the rocker, -45°<α<45°; the first wheel is fixed to the upper end of the donkey head; the second wheel is rotatably connected to the rocker; the third wheel is fixed to the frame assembly; one end of the traction rope is wound around the first wheel, and the other end of the traction rope bypasses the second wheel and is wound around the third wheel; when the rocker drives the donkey head to rotate, the traction rope drives the donkey head to rotate relative to the rocker and the rotation direction is the same as the rotation direction of the rocker.

[0010] Furthermore, there are two limit assemblies, which are respectively located on both sides of the length direction of the walking beam; one end of the limit assemblies is connected to the donkey head, and the other end of the limit assemblies is connected to the walking beam.

[0011] Furthermore, the limit assembly includes a limit rod, a limit block and a pair of buffers; the limit block is fixed on the rocker and is provided with a limit hole extending along the length direction of the rocker; one end of the limit rod is rotatably connected to the donkey head, and the other end of the limit rod cooperates with the limit hole; a pair of buffers are arranged on the limit block and located on both sides of the limit hole; one end of the buffer is fixed to the limit block, and the other end of the buffer is slidably arranged on the limit block; the buffer is used to prevent the limit rod from impacting the side wall of the limit hole.

[0012] Furthermore, the traction assembly also includes a second tensioning wheel; the second tensioning wheel is rotatably connected to the walking beam and is used to tension the traction rope.

[0013] Furthermore, the first connecting rod, the second connecting rod, the pawl and the elastic pressure plate constitute a toggle member, one end of the toggle member is connected to the rocker at point B, and the other end of the toggle member is connected to the ratchet at point C; the number of the toggle members is two and they are symmetrically distributed about the straight line BC.

[0014] Furthermore, the sensor unit includes an infrared sensor; the infrared sensor is arranged on the frame assembly and is used to detect the position of the donkey head.

[0015] The technical solution of the present invention proposes an energy-saving oil pumping unit, wherein a crank, a slider and a rocker beam form a crank rocker mechanism, when the rocker beam swings relative to a frame assembly, the slider slides on the rocker beam, so that the force point position of the crank acting on the rocker beam is different, and the crank arm is constantly changing, so that the load of the donkey head is an alternating load, and the first counterweight block and the balance assembly have a balancing effect on the rocker beam and the donkey head, and the fluctuation amount of the static torque curve of the crank shaft after balancing is small, and the heat loss work of the first driving mechanism is proportional to the current and power fluctuation amount, and the current and power fluctuation amount is related to the static torque of the crank shaft, and the smaller the fluctuation amount, the smaller the heat loss work of the first driving mechanism, so that the efficiency of the oil pumping unit is higher; During the swinging process of the walking beam relative to the frame assembly, the sensor unit detects the position of the donkey head and transmits its position signal to the processor, and the processor controls the operation of the second driving mechanism, and the second driving mechanism drives the swing rod to rotate relative to the walking beam. The torque of the second counterweight block and the swing rod acting on the walking beam can offset the torque generated by the donkey head relative to the frame assembly to a certain extent, so that the force required for the crank to drive the walking beam to rotate is also small, thereby reducing the power of the first driving mechanism; When the walking beam swings relative to the frame assembly, it will drive the second connecting rod to swing back and forth relative to the ratchet through the first connecting rod. At this time, the pawl on the second connecting rod can abut against the ratchet to rotate, and the ratchet then drives the power generation unit to generate electricity. During the process of the pawl driven by the second connecting rod to swing, the elastic pressing plate can press the pawl to the surface of the ratchet to prevent the pawl from detaching from the ratchet. The electric energy generated by the power generation unit can be used to drive the second driving mechanism, thereby improving the energy utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of an energy-saving oil pumping unit according to an embodiment of the present invention; Figure 2 for Figure 1 Enlarged view at P in the middle; Figure 3 for Figure 1 Enlarged view of the middle Q; Figure 4 It is a schematic diagram of the structure of a power generation component according to an embodiment of the present invention.

[0018] Icons: 101, first frame; 102, second frame; 201, walking beam; 202, donkey head; 301, reducer; 302, drive motor; 303, crank; 304, slider; 305, first counterweight; 401, rocker; 402, second counterweight; 403, first rotating wheel; 404, second rotating wheel; 405, first transmission member; 406, connecting plate; 4061, radial groove; 407, first gear; 408, second gear; 4081, guide hole ; 409, sliding member; 410, bending plate; 411, mounting plate; 412, first tensioning wheel; 501, first connecting rod; 502, second connecting rod; 503, ratchet; 504, pawl; 505, elastic pressing plate; 506, generator; 601, first wheel; 602, second wheel; 603, third wheel; 604, traction rope; 605, second tensioning wheel; 701, limiting rod; 702, limiting block; 7021, limiting hole; 703, slide plate; 704, spring. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] Combine the following Figure 1-Figure 4 , describing the energy-saving oil pumping unit according to an embodiment of the present invention.

[0024] An energy-saving oil pumping unit comprises: a frame assembly; a walking beam 201, the walking beam 201 is rotatably connected to the frame assembly at point A, and one end of the walking beam 201 is connected to a donkey head 202; a driving assembly, comprising a first driving mechanism, a crank 303, a slider 304 and a first counterweight 305; the first driving mechanism is arranged on the frame assembly and is used to drive the crank 303 to rotate; one end of the crank 303 is connected to the first counterweight 305, and the other end of the crank 303 is rotatably connected to the slider 304; the slider 304 is slidably arranged on the walking beam 201 and is located between point A and the donkey head 202; a balancing assembly, comprising a swing rod 401, a second counterweight 402 and a second driving mechanism; one end of the swing rod 401 is rotatably connected to the walking beam 201, and the other end of the swing rod 401 is connected to the second counterweight 402; the second driving mechanism is used to drive the swing rod 401 to rotate relative to the walking beam 201; point A is located between the slider 304 and the swing rod 401 between; a power generation component, comprising a first connecting rod 501, a second connecting rod 502, a ratchet 503, a pawl 504, an elastic pressing plate 505 and a power generation unit; one end of the first connecting rod 501 is rotatably connected to the walking beam 201, and the other end of the first connecting rod 501 is rotatably connected to the second connecting rod 502; the second connecting rod 502 is rotatably connected to the ratchet 503, and the second connecting rod 502 is also connected with a pawl 504 and an elastic pressing plate 505, wherein the pawl 504 is rotatably connected to the second connecting rod 502, and the elastic pressing plate 505 is used to compress the pawl 504 to cooperate with the ratchet 503; the power generation unit is used to convert the mechanical energy of the rotation of the ratchet 503 into electrical energy; an electronic control component, comprising a sensor unit and a processor, and the first drive mechanism, the second drive mechanism, the power generation unit and the sensor unit are all electrically connected to the processor; the sensor unit is used to detect the position of the donkey head 202; the electrical energy generated by the power generation unit is used to drive the second drive mechanism.

[0025] The frame assembly may include a first frame 101 and a second frame 102 , the first driving mechanism may be disposed on the first frame 101 , and the walking beam 201 is rotatably connected to the second frame 102 at point A. The height of the first frame 101 may be smaller than that of the second frame 102 .

[0026] The first driving mechanism may include a reducer 301 and a driving motor 302 that are transmission-connected, and the crank 303 is transmission-connected to the reducer 301 .

[0027] The crank 303, the slider 304 and the rocker 201 form a crank 303 rocker mechanism. When the rocker 201 swings relative to the frame assembly, the slider 304 slides on the rocker 201, so that the force applied by the crank 303 on the rocker 201 is at different points. The lever arm of the crank 303 is also constantly changing, so that the load on the donkey head 202 is an alternating load. The first counterweight 305 and the balance assembly have a balancing effect on the rocker 201 and the donkey head 202. The static torque curve fluctuation of the crank 303 shaft after balancing is small, and the heat loss work of the first drive mechanism is proportional to the current and power fluctuations. The current and power fluctuations are related to the static torque of the crank 303 shaft. The smaller the fluctuation, the smaller the heat loss work of the first drive mechanism, so that the efficiency of the oil pump is higher.

[0028] During the swinging of the beam 201 relative to the frame assembly, the horizontal position and vertical position of the donkey head 202 are changing. When the beam 201 is in a horizontal state, the center of gravity of the donkey head 202 is farthest from point A. At this time, the torque of the donkey head 202 acting on point A is also large. The second driving mechanism can drive the swing rod 401 to rotate so that the long side of the swing rod 401 is parallel to the long side of the beam 201. At this time, the distance between the center of gravity of the second counterweight 402 and point A is the largest; when the beam 201 is in an inclined state, the distance between the center of gravity of the donkey head 202 and point A decreases. At this time, the second driving mechanism can drive the swing rod 401 to rotate so that the long side of the swing rod 401 is arranged at an angle with the long side of the beam 201. The specific way in which the second driving mechanism drives the swing rod 401 to rotate is: after the sensor unit detects the position of the donkey head 202, it will transmit its position signal to the processor, and the processor will then control the operation of the second driving mechanism, and the second driving mechanism drives the swing rod 401 to rotate relative to the beam 201. The torque exerted by the second counterweight 402 and the rocker 401 on the rocker 201 can offset the torque generated by the donkey head 202 relative to the frame assembly to a certain extent, so that the force required by the crank 303 to drive the rocker 201 to rotate is also relatively small, thereby reducing the power of the first drive mechanism.

[0029] When the walking beam 201 swings relative to the frame assembly, it will drive the second connecting rod 502 to swing back and forth relative to the ratchet 503 through the first connecting rod 501. At this time, the pawl 504 on the second connecting rod 502 can abut against the ratchet 503 to rotate, and the ratchet 503 will drive the power generation unit to generate electricity. During the process of the pawl 504 driven by the second connecting rod 502 to swing, the elastic pressing plate 505 can press the pawl 504 to stick to the surface of the ratchet 503 to prevent the pawl 504 from detaching from the ratchet 503. The electric energy generated by the power generation unit can be used to drive the second driving mechanism, thereby improving the energy utilization rate.

[0030] In one embodiment, the sensor unit may include an infrared sensor; the infrared sensor is disposed on the frame assembly and is used to detect the position of the donkey head 202.

[0031] In one embodiment, the second driving mechanism includes a first rotating wheel 403, a second rotating wheel 404, a first transmission member 405 and a balancing motor; the balancing motor is arranged on the walking beam 201 and is used to drive the first rotating wheel 403 to rotate; one end of the swing rod 401 is connected to the second rotating wheel 404, and the second rotating wheel 404 is rotatably connected to the walking beam 201; the first transmission member 405 is used to transmit the power of the first rotating wheel 403 to the second rotating wheel 404. In this embodiment, the first rotating wheel 403 and the second rotating wheel 404 can both be sprockets, and the first transmission member 405 can be a chain; the balancing motor can be a reduction motor, and the balancing motor drives the first rotating wheel 403 to rotate, and the first rotating wheel 403 can drive the second rotating wheel 404 to rotate through the first transmission member 405, and the swing rod 401 is fixedly connected to the second rotating wheel 404, so that the swing rod 401 rotates relative to the walking beam 201.

[0032] In one embodiment, the balancing assembly further includes a connecting plate 406, a first gear 407, a second gear 408, a variable diameter motor and a plurality of sliding members 409; the connecting plate 406 is fixed on the first rotating wheel 403 and is provided with a plurality of radial grooves 4061 along the circumference of the connecting plate 406; the sliding member 409 is slidably arranged in the radial groove 4061, a bent plate 410 is provided at one end of the sliding member 409, and a connecting block is provided at the other end of the sliding member 409; the variable diameter motor is fixed on the connecting plate 406 and is used to drive the first rotating wheel 403 to rotate. The gear 407 rotates; the second gear 408 is rotationally connected to the connecting plate 406 and the second gear 408 is meshed with the first gear 407; the second gear 408 is circumferentially provided with a plurality of guide holes 4081 that cooperate with the connecting block; when the second gear 408 rotates, the connecting block slides along the guide hole 4081, so that the sliding member 409 moves along the radial groove 4061 away from or close to the center of the connecting plate 406; the outer contour of the plurality of bent plates 410 forms a reducing wheel, and the first transmission member 405 is transmission-connected to the reducing wheel.

[0033] When the walking beam 201 rotates relative to the frame assembly, the rotation speed of the walking beam 201 is different. When the walking beam 201 swings upward, the angular velocity is slower, and when the walking beam 201 swings downward, the angular velocity is faster. By arranging a variable diameter wheel on the first rotating wheel 403, the diameter of the variable diameter wheel can be changed, so that the transmission ratio between the variable diameter wheel and the second rotating wheel 404 can be adjusted, thereby changing the rotation speed of the second rotating wheel 404, so that the rotation speed of the second balancing block driven by the rocker arm 401 can be adjusted.

[0034] If a variable diameter mechanism is not provided, and the rotation speeds of the first rotor 403 and the second rotor 404 are adjusted directly by changing the rotation speed of the balancing motor, a large change in the power of the balancing motor will occur. The balancing motor is powered by a power generation unit, and the constant change in the power of the balancing motor may cause the power generation unit to experience frequency fluctuations, voltage fluctuations, uneven loads, increased burden on the generator, and other problems, thereby affecting the stability, economy, and reliability of the power generation unit.

[0035] The variable diameter motor can be connected to an external power source. When the rotation speed of the balancing motor remains unchanged, the rotation speed of the second rotating wheel 404 is adjusted by changing the size of the variable diameter wheel, so that the power of the balancing motor is relatively stable.

[0036] When the walking beam 201 swings downward, the diameter of the variable wheel can be controlled to become larger. At this time, the transmission ratio between the variable wheel and the second rotating wheel 404 becomes larger, and the rotation speed of the second rotating wheel 404 increases; similarly, when the walking beam 201 swings upward, the diameter of the variable wheel can be controlled to become smaller. At this time, the transmission ratio between the variable wheel and the second rotating wheel 404 becomes smaller, and the rotation speed of the second rotating wheel 404 decreases.

[0037] Specifically, the connecting plate 406 may be a circular plate, and the connecting plate 406 is arranged cocentrically with the first rotating wheel 403. The variable diameter motor may be a worm gear reduction motor, so that the variable diameter motor has a self-locking function. Let the center of the connecting plate 406 be point O, the end of the guide hole 4081 close to point O be point D, and the end of the guide hole 4081 away from point O be point E, then straight line OD intersects straight line DE and ∠ODE is an obtuse angle. The direction from point D to point E may be counterclockwise. When the diameter of the variable diameter wheel is the smallest, the connecting block on the sliding member 409 abuts against point D of the guide hole 4081, and at this time the bent plate 410 is close to the outer wall of the connecting plate 406; when the variable diameter motor drives the first gear 407 to rotate counterclockwise, the second gear 408 rotates clockwise accordingly, and at this time the connecting block moves from point D to point E along the guide hole 4081, the sliding member 409 slides along the radial groove 4061, and the bent plate 410 gradually moves away from the connecting plate 406; similarly, when the variable diameter motor drives the first gear 407 to rotate clockwise, the second gear 408 rotates counterclockwise accordingly, and at this time the connecting block moves from point E to point D along the guide hole 4081, the sliding member 409 slides along the radial groove 4061, and the bent plate 410 gradually approaches the connecting plate 406.

[0038] It should be noted that clockwise and counterclockwise here refer to Figure 2 Clockwise and counterclockwise in.

[0039] The second rotating wheel 404 may be a pulley, the first transmission member 405 may be a belt, and the side wall of the bent plate 410 away from the connecting plate 406 may be provided with convex teeth (not shown in the figure) that cooperate with the belt.

[0040] In one embodiment, the balancing assembly also includes a mounting plate 411 and a first tensioning wheel 412; the mounting plate 411 is arranged on the walking beam 201; the first rotating wheel 403 and the first tensioning wheel 412 are both rotatably connected to the mounting plate 411; the first transmission member 405 is sleeved on the outer side of the bending plate 410, the first tensioning wheel 412 and the second rotating wheel 404.

[0041] The mounting plate 411 can be arranged on the walking beam 201 and extend to one side of the frame assembly. The mounting plate 411 and the swing rod 401 are not in the same plane in the axial direction of the swing rod 401, so as to avoid interference between the swing rod 401 and the mounting plate 411 when the swing rod 401 rotates around the walking beam 201. The first tensioning wheel 412 is used to tension the first transmission member 405, so that the first transmission member 405 will not be loosened in a certain place during the process of the diameter-changing wheel changing the diameter, so as to avoid the first transmission member 405 from being separated from the second rotating wheel 404 or the bent plate 410.

[0042] In one of the embodiments, it also includes a traction component and a limiting component; the traction component includes a first wheel 601, a second wheel 602, a third wheel 603 and a traction rope 604; the donkey head 202 is rotatably connected to the rocker 201; the limiting component is used to limit the rotation angle α of the donkey head 202 relative to the rocker 201, -45°<α<45°; the first wheel 601 is fixed to the upper end of the donkey head 202; the second wheel 602 is rotatably connected to the rocker 201; the third wheel 603 is fixed to the frame component; one end of the traction rope 604 is wound around the first wheel 601, and the other end of the traction rope 604 bypasses the second wheel 602 and is wound around the third wheel 603; when the rocker 201 drives the donkey head 202 to rotate, the traction rope 604 drives the donkey head 202 to rotate relative to the rocker 201 and the rotation direction is the same as the rotation direction of the rocker 201.

[0043] The donkey head 202 is used to drive the deep well pump to work through the rope suspension assembly. When the walking beam 201 swings downward relative to the frame assembly, the suspension rope on the donkey head 202 is released, the position of the third wheel 603 remains unchanged, the second wheel 602 approaches the third wheel 603, the traction rope 604 between the second wheel 602 and the third wheel 603 is relatively shortened, and the traction rope 604 between the first wheel 601 and the second wheel 602 is relatively extended, so that the donkey head 202 swings downward relative to the walking beam 201, so that the suspension rope on the donkey head 202 is further released; when the walking beam 201 swings upward relative to the frame assembly, the suspension rope on the donkey head 202 is tightened, the second wheel 602 moves away from the third wheel 603, the traction rope 604 between the second wheel 602 and the third wheel 603 is relatively extended, and the traction rope 604 between the first wheel 601 and the second wheel 602 is relatively shortened, and the traction rope 604 pulls the donkey head 202 to swing upward relative to the walking beam 201, so that the suspension rope on the donkey head 202 is further tightened. In summary, the traction assembly can improve the efficiency of the donkey head 202 in dropping and tightening the suspension rope.

[0044] The limiting component has a certain supporting and limiting effect on the donkey head 202, so as to prevent the donkey head 202 from rotating at a large angle relative to the swimming beam 201 during the swinging process of the swimming beam 201, thereby affecting the release and tightening of the suspension rope.

[0045] In one embodiment, there are two limit assemblies, which are respectively located on both sides of the length direction of the walking beam 201; one end of the limit assemblies is connected to the donkey head 202, and the other end of the limit assemblies is connected to the walking beam 201.

[0046] The two limit assemblies can be respectively located above and below the walking beam 201. When the donkey head 202 rotates downward (upward) relative to the walking beam 201, the upper limit assembly has a pulling (supporting) effect on the donkey head 202, and the lower limit assembly has a supporting (pulling) effect on the donkey head 202.

[0047] In one embodiment, the limit assembly includes a limit rod 701, a limit block 702 and a pair of buffers; the limit block 702 is fixed on the rocker 201 and is provided with a limit hole 7021 extending along the length direction of the rocker 201; one end of the limit rod 701 is rotatably connected to the donkey head 202, and the other end of the limit rod 701 cooperates with the limit hole 7021; a pair of buffers are arranged on the limit block 702 and located on both sides of the limit hole 7021; one end of the buffer is fixed to the limit block 702, and the other end of the buffer is slidably arranged on the limit block 702; the buffer is used to prevent the limit rod 701 from impacting the side wall of the limit hole 7021.

[0048] The buffer member may be a rubber member.

[0049] The buffer may also include a slide plate 703 and a plurality of springs 704 ; the slide plate 703 is slidably connected to the limit block 702 , one end of the spring 704 is connected to the slide plate 703 , and the other end is connected to the limit block 702 .

[0050] One end of the buffer member close to the limiting hole 7021 is located between the two ends of the limiting hole 7021 in the length direction of the walking beam 201, so that the limiting rod 701 can contact the buffer member before abutting the side wall of the limiting hole 7021, thereby preventing the limiting rod 701 from impacting the side wall of the limiting hole 7021. When the donkey head 202 rotates downward relative to the rocker 201, the limiting rod 701 below the rocker 201 moves along the limiting hole 7021 toward the side of the rocker 401 and squeezes the buffer close to the rocker 401, and the limiting rod 701 above the rocker 201 moves along the limiting hole 7021 toward the side of the donkey head 202 and squeezes the buffer close to the donkey head 202; when the donkey head 202 rotates upward relative to the rocker 201, the limiting rod 701 below the rocker 201 moves along the limiting hole 7021 toward the side of the donkey head 202 and squeezes the buffer close to the donkey head 202, and the limiting rod 701 above the rocker 201 moves along the limiting hole 7021 toward the side of the rocker 401 and squeezes the buffer close to the rocker 401.

[0051] In one embodiment, the traction assembly further includes a second tensioning wheel 605 ; the second tensioning wheel 605 is rotatably connected to the walking beam 201 and is used to tension the traction rope 604 to prevent the traction rope 604 from detaching from the second wheel 602 during the rotation of the walking beam 201 .

[0052] In one embodiment, the first connecting rod 501, the second connecting rod 502, the pawl 504 and the elastic pressing plate 505 constitute a toggle member, one end of the toggle member is connected to the rocker 201 at point B, and the other end of the toggle member is connected to the ratchet 503 at point C; the number of the toggle members is two and they are symmetrically distributed about the straight line BC.

[0053] The power generation unit includes a generator 506 .

[0054] refer to Figure 1 , the convex teeth of the ratchet 503 may extend in the clockwise direction. The number of ratchet wheels 503 may be two and they are coaxially distributed and connected to the rotating shaft of the generator 506. The side close to the generator 506 is the inner side, and the side away from the generator 506 is the outer side. The side of the second connecting rod 502 away from the first connecting rod 501 may be a V-shaped frame. For the outer second connecting rod 502, the upper end of the V-shaped frame is rotatably connected to a pawl 504, and the lower end of the V-shaped frame is connected to an elastic pressing plate 505; for the inner second connecting rod 502, the lower end of the V-shaped frame is rotatably connected to a pawl 504, and the upper end of the V-shaped frame is connected to an elastic pressing plate 505.

[0055] When the rocker 201 swings downward, the first connecting rod 501 drives the outer second connecting rod 502 to rotate clockwise, and the pawl 504 on the outer second connecting rod 502 does not engage the ratchet 503; while the first connecting rod 501 drives the inner second connecting rod 502 to rotate counterclockwise, and the inner pawl 504 engages the ratchet 503 and drives the ratchet 503 to rotate counterclockwise.

[0056] When the rocker 201 swings upward, the first connecting rod 501 drives the outer second connecting rod 502 to rotate counterclockwise, and the outer pawl 504 engages the ratchet 503 and drives the ratchet 503 to rotate counterclockwise; while the first connecting rod 501 drives the inner second connecting rod 502 to rotate clockwise, and the inner pawl 504 does not engage the ratchet 503.

[0057] In summary, when the walking beam 201 swings up and down, at least one ratchet wheel 503 will rotate, thereby driving the generator 506 to generate electricity.

[0058] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above-described embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An energy-saving oil pumping unit, characterized in that: include: Rack components; A walking beam, the walking beam is rotatably connected to the frame assembly at point A, and one end of the walking beam is connected to a donkey head; The driving assembly comprises a first driving mechanism, a crank, a slider and a first counterweight; the first driving mechanism is arranged on the frame assembly and is used to drive the crank to rotate; one end of the crank is connected to the first counterweight, and the other end of the crank is rotatably connected to the slider; the slider is slidably arranged on the rocker and is located between point A and the donkey head; A balancing assembly comprises a swing rod, a second counterweight and a second driving mechanism; one end of the swing rod is rotatably connected to the rocker, and the other end of the swing rod is connected to the second counterweight; the second driving mechanism is used to drive the swing rod to rotate relative to the rocker; point A is located between the slider and the swing rod; A power generation assembly, comprising a first connecting rod, a second connecting rod, a ratchet, a pawl, an elastic pressing plate and a power generation unit; one end of the first connecting rod is rotatably connected to the walking beam, and the other end of the first connecting rod is rotatably connected to the second connecting rod; the second connecting rod is rotatably connected to the ratchet, and the second connecting rod is also connected to the pawl and the elastic pressing plate, wherein the pawl is rotatably connected to the second connecting rod, and the elastic pressing plate is used to compress the pawl to cooperate with the ratchet; the power generation unit is used to convert the mechanical energy of the ratchet rotation into electrical energy; An electric control component, comprising a sensor unit and a processor, wherein the first driving mechanism, the second driving mechanism, the power generation unit and the sensor unit are all electrically connected to the processor; The sensor unit is used to detect the position of the donkey head; the electric energy generated by the power generation unit is used to drive the second driving mechanism.

2. The energy-saving oil pumping unit according to claim 1, characterized in that: The second driving mechanism includes a first rotating wheel, a second rotating wheel, a first transmission member and a balancing motor; the balancing motor is arranged on the rocker arm and is used to drive the first rotating wheel to rotate; one end of the rocker arm is connected to the second rotating wheel, and the second rotating wheel is rotatably connected to the rocker arm; the first transmission member is used to transmit the power of the first rotating wheel to the second rotating wheel.

3. The energy-saving oil pumping unit according to claim 2, characterized in that: The balancing assembly also includes a connecting plate, a first gear, a second gear, a variable diameter motor and multiple sliding members; the connecting plate is fixed on the first rotating wheel and is provided with multiple radial grooves along the circumference of the connecting plate; the sliding member is slidably arranged in the radial groove, a bent plate is provided at one end of the sliding member, and a connecting block is provided at the other end of the sliding member; the variable diameter motor is fixed on the connecting plate and is used to drive the first gear to rotate; the second gear is rotatably connected to the connecting plate and the second gear is meshed with the first gear; the second gear is circumferentially provided with multiple guide holes that cooperate with the connecting block; when the second gear rotates, the connecting block slides along the guide hole, so that the sliding member moves along the radial groove away from or close to the center of the connecting plate; the outer contours of the multiple bent plates form a variable diameter wheel, and the first transmission member is transmission-connected to the variable diameter wheel.

4. The energy-saving oil pumping unit according to claim 3, characterized in that: The balancing assembly also includes a mounting plate and a first tensioning wheel; the mounting plate is arranged on the walking beam; the first rotating wheel and the first tensioning wheel are both rotatably connected to the mounting plate; the first transmission member is sleeved on the outer side of the bending plate, the first tensioning wheel and the second rotating wheel.

5. The energy-saving oil pumping unit according to claim 1, characterized in that: It also includes a traction assembly and a limiting assembly; the traction assembly includes a first wheel, a second wheel, a third wheel and a traction rope; the donkey head is rotatably connected to the rocker; the limiting assembly is used to limit the rotation angle α of the donkey head relative to the rocker, -45°<α<45°; the first wheel is fixed to the upper end of the donkey head; the second wheel is rotatably connected to the rocker; the third wheel is fixed to the frame assembly; one end of the traction rope is wound around the first wheel, and the other end of the traction rope bypasses the second wheel and is wound around the third wheel; when the rocker drives the donkey head to rotate, the traction rope drives the donkey head to rotate relative to the rocker and the rotation direction is the same as the rotation direction of the rocker.

6. The energy-saving oil pumping unit according to claim 5, characterized in that: There are two limit assemblies, which are respectively located on both sides of the length direction of the walking beam; one end of the limit assemblies is connected to the donkey head, and the other end of the limit assemblies is connected to the walking beam.

7. The energy-saving oil pumping unit according to claim 6, characterized in that: The limit assembly includes a limit rod, a limit block and a pair of buffers; the limit block is fixed on the rocker and is provided with a limit hole extending along the length direction of the rocker; one end of the limit rod is rotatably connected to the donkey head, and the other end of the limit rod cooperates with the limit hole; a pair of buffers are arranged on the limit block and located on both sides of the limit hole; one end of the buffer is fixed to the limit block, and the other end of the buffer is slidably arranged on the limit block; the buffer is used to prevent the limit rod from impacting the side wall of the limit hole.

8. The energy-saving oil pumping unit according to claim 5, characterized in that: The traction assembly also includes a second tensioning wheel; the second tensioning wheel is rotatably connected to the walking beam and is used to tension the traction rope.

9. The energy-saving oil pumping unit according to claim 1, characterized in that: The first connecting rod, the second connecting rod, the pawl and the elastic pressing plate constitute a toggle member, one end of the toggle member is connected to the rocker at point B, and the other end of the toggle member is connected to the ratchet at point C; the number of the toggle members is two and they are symmetrically distributed about the straight line BC.

10. The energy-saving oil pumping unit according to claim 1, characterized in that: The sensor unit comprises an infrared sensor; the infrared sensor is arranged on the frame assembly and is used to detect the position of the donkey head.

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