A vertical modular closed-type pumping unit

Abstract

The present invention specifically relates to a vertical modular closed-type pumping unit, which solves the problems of low mechanical efficiency, difficult maintenance, inability to adjust the stroke, and difficulty in meeting the requirements of long strokes of the pumping unit. A vertical modular closed-type pumping unit includes a frame, a driving mechanism, a transmission mechanism, a balance counterweight box, and a suspension device. The frame includes a bottom frame, a driving section, a lower standard section, a driven section, an upper standard section, and a top frame; a reversing synchronous shaft is connected between two chains, bearings are installed on the side wall of the reversing synchronous shaft, a sliding seat is fixed at the bottom of the balance counterweight box, and the outer ring of the bearing is slidably connected to the sliding seat; an upper reversing energy storage mechanism is arranged between the balance counterweight box and the top frame, and a lower reversing energy storage mechanism is arranged between the sliding seat and the bottom frame. The present invention is energy-saving, has high mechanical efficiency, is light in weight, has small inertial loads, is easy to achieve long strokes, reduces the maintenance cost during operation, has the function of energy storage and release, and can meet the requirements of long strokes, low stroke frequencies, large pumps, and deep pumping.

Description

Technical Field

[0001] The present invention relates to deep - well pumping machinery in oil fields, and particularly to pumping units, specifically a vertical modular closed - type pumping unit. Background Art

[0002] With the development of water injection in oil fields and the development of a large number of low - permeability oil fields, the depth of the well and the displacement have been continuously increasing. In addition, with the development of special oil fields (such as heavy oil, high - pour - point oil, wax - deposition, sand - production, etc.), the oil production technology has put forward requirements for rod - pumping equipment such as long stroke, low pumping speed, large pump, and deep pumping. At present, the pumping units used in oil fields in China are beam pumping units and vertical chain pumping units.

[0003] Beam pumping units have the advantages of simple structure and durability. However, due to the limitations of the working principle and structure, they have the disadvantages of low mechanical efficiency, unstable operation, difficulty in adjusting the stroke and pumping speed, especially high energy consumption. It is difficult to meet the needs of special oil fields. Therefore, the existing beam pumping units with four - link structures obviously cannot meet the above requirements. First, the output torque of the reducer of the beam pumping unit is proportional to the stroke length. Increasing the stroke will increase the external dimensions of the pumping unit and the torque reducer, resulting in a sharp increase in the overall weight of the machine and an increase in manufacturing costs, which is unacceptable economically. Second, the four - link mechanism of the beam pumping unit determines the uneven movement of the donkey head, and a large acceleration is generated at the suspension point. In order to avoid excessive acceleration, the swing angle of the beam and the crank - connecting rod ratio of the four - link mechanism cannot be too large. When the stroke length is increased, the size of the four - link mechanism also increases accordingly, and the overall contour dimensions and weight of the machine increase significantly; when the stroke exceeds 6m, the growth of the volume and weight of the pumping unit will become a fatal obstacle to its popularization and application. The vertical chain pumping unit has the contradictions of difficult maintenance, high maintenance cost, and inability to adjust the stroke on - site, which also become a fatal obstacle to its popularization and application. Therefore, due to the limitations of the working principle and structure, the existing pumping units are difficult to meet the requirements of modern oil production technology for pumping equipment. Summary of the Invention

[0004] In order to solve the problems of low mechanical efficiency, difficult maintenance, inability to adjust the stroke, and difficulty in meeting the requirements of long stroke of the existing pumping units, the present invention provides a vertical modular closed - type pumping unit.

[0005] The present invention is implemented by the following technical solutions:

[0006] A vertical modular closed pumping unit, comprising a frame, a driving mechanism, a transmission mechanism, a balance counterweight box and a suspension device. The transmission mechanism comprises a double-row sprocket chain mechanism composed of two driving sprockets, two driven sprockets and two chains. The frame comprises a chassis and an active section, a lower standard section, a driven section, an upper standard section and a top frame which are fixedly connected to the upper left side of the chassis and spliced in sequence from bottom to top. The number of the lower standard sections is several. The balance counterweight box is arranged inside the frame, and the balance counterweight box moves vertically between the active section, the lower standard section, the driven section and the upper standard section through a guiding mechanism. Two guiding wheels which are horizontally arranged and distributed left and right are installed on the top frame. The suspension device is connected to the top of the balance counterweight box through a suspension chain passing around the two guiding wheels.

[0007] The two driving sprockets are respectively installed on the front inner side wall and the rear inner side wall of the active section. The two driven sprockets are respectively installed on the front inner side wall and the rear inner side wall of the driven section. A longitudinally arranged reversing synchronous shaft is connected between the two chains. A bearing is installed in the middle of the side wall of the reversing synchronous shaft. A horizontally arranged rectangular frame-shaped sliding seat is fixedly connected to the bottom of the balance counterweight box. The outer ring of the bearing is slidably connected with the sliding seat.

[0008] An upper reversing energy storage mechanism is arranged between the balance counterweight box and the top frame. The upper reversing energy storage mechanism comprises an adjusting bolt fixedly connected to the bottom of the top frame vertically, and two vertical screws fixedly connected to the top end surface of the balance counterweight box and distributed left and right. A buffer pressure plate which is vertically opposite to the adjusting bolt in the upper and lower directions is movably sleeved on the two vertical screws together. A locking nut is also sleeved on each vertical screw and located above the buffer pressure plate. A buffer spring, a limiting plate and a locking nut I are sequentially arranged below the buffer pressure plate from top to bottom. The two ends of the buffer spring are respectively connected with the buffer pressure plate and the limiting plate.

[0009] A lower reversing energy storage mechanism is arranged between the sliding seat and the chassis. The lower reversing energy storage mechanism comprises an adjusting bolt I fixedly connected to the upper side of the chassis vertically, and two vertical screws I fixedly connected to the bottom surface of the sliding seat and distributed left and right. A buffer pressure plate I which is vertically opposite to the adjusting bolt I in the upper and lower directions is movably sleeved on the two vertical screws I together. A locking nut II is also sleeved on each vertical screw I and located below the buffer pressure plate I. A buffer spring I, a limiting plate I and a locking nut III are sequentially arranged above the buffer pressure plate I from bottom to top. The two ends of the buffer spring I are respectively connected with the buffer pressure plate I and the limiting plate I.

[0010] Further, the driving mechanism comprises a motor installed on the upper right side of the chassis and two speed reducers installed on the front side and the rear side of the driven section. The input shafts of the two speed reducers are coaxially arranged and connected as a whole. The input shaft of the speed reducer located on the front side is in transmission connection with the output shaft of the motor.

[0011] Further, a direction wheel that is longitudinally placed and located between the vertical screws is installed on the top surface of the balance weight box. Two annular grooves are fixed on the side surface of each guide wheel. The head end of the lifting chain is fixedly connected to the front part of the suspension rope device. The tail end of the lifting chain sequentially winds around the two annular grooves located on the front side, the direction wheel, and the two annular grooves located on the rear side, and is fixedly connected to the rear part of the suspension rope device.

[0012] Further, a horizontally upright slider located in the inner cavity of the sliding seat is fixed to the outside of the bearing. Four pairs of T-shaped guide wheels are installed at the four corners of the slider. The four T-shaped guide wheels located on the front side are in rolling contact with the front frame edge of the sliding seat; the four T-shaped guide wheels located on the rear side are in rolling contact with the rear frame edge of the sliding seat.

[0013] Further, U-shaped clamping plates are fixed to both ends of the reversing synchronous shaft. One link of the chain is clamped in the inner cavity of the U-shaped clamping plate, and a movable block located inside the link is fixedly connected between the two side plates of the U-shaped clamping plate through a mounting bolt.

[0014] Further, the reversing synchronous shaft is connected to the chain through an annular link welded to its end.

[0015] Further, two T-shaped guide rail rods that are horizontally distributed and vertically arranged are commonly fixed to the inner side walls of the driving section, the lower standard section, the driven section, and the upper standard section; the guiding mechanism is four guiding rollers installed at the corners of the balance weight box and in rolling contact with the T-shaped guide rail rods or four U-shaped sliders fixedly connected to the corners of the balance weight box and in sliding contact with the T-shaped guide rail rods.

[0016] Further, fixing plates are fixed to both the front side wall and the rear side wall of the driven section. An oval shaft-passing hole and a plurality of strip-shaped adjustment holes are formed in the fixing plates; the axle of the driven sprocket passes through the shaft-passing hole, and circular outer mounting plates and L-shaped inner mounting plates distributed on both sides of the fixing plate are fixedly sleeved on the axle of the driven sprocket. A plurality of connecting bolts passing through the strip-shaped adjustment holes are connected between the circular outer mounting plates and the L-shaped inner mounting plates; two height adjustment bolts are vertically arranged between the horizontal plate of the L-shaped inner mounting plate and the driven section.

[0017] Further, the bearing is a spherical roller bearing; the chain and the lifting chain are both circular chain rings.

[0018] The present invention has the following advantages compared with the existing pumping unit:

[0019] (1) The present invention is energy-saving and has high mechanical efficiency. In the present invention, a transmission mechanism of a double-row sprocket chain mechanism is adopted, so that the transmission route is short and the inertial mass is small, thereby improving the mechanical transmission efficiency. When the sucker rod rises, the chain drives the reversing synchronous shaft and the balance counterweight box to jointly lift the sucker rod; when the balance counterweight box rises, the chain drives the reversing synchronous shaft and the sucker rod to jointly lift the balance counterweight box. That is: the chain drives the reversing synchronous shaft to pull the sucker rod up when the sucker rod needs to rise; the chain drives the reversing synchronous shaft to pull the balance counterweight box up when the balance counterweight box rises. In short, the high-speed rotating motor can continuously do work evenly, so the currents of the mechanical sucker rod in the upstroke and downstroke are close or the same. The upper reversing energy storage mechanism and the lower reversing energy storage mechanism make full use of the energy for the sucker rod to reverse, so that the current does not peak when the sucker rod reverses or the peak current does not exceed the rated current when running to the reversing point. Balance counterweight irons are placed in the balance counterweight box of this pumping unit, which can be increased or decreased to adjust the counterweight, and can achieve a relatively accurate balance according to the measured upper and lower pulling forces of the oil well indicator diagram, so that the torque borne by the reducer during the working process is minimized, and its torque value remains unchanged or changes very little. At the same time, the motor also works in a balanced state.

[0020] (2) The present invention is light in weight, has small inertial loads, and is easy to achieve a long stroke. This pumping unit adopts a transmission mechanism of a double-row sprocket chain mechanism, which saves the use of profiles compared with the crank four-bar mechanism of the conventional beam pumping unit, greatly reduces the weight of the whole machine, and at the same time greatly reduces the inertial loads borne by the reducer during the operation of the system. The distance between the closed driving sprocket and the driven sprocket of this pumping unit determines the stroke of this pumping unit, and thus makes it easy and feasible to realize a long-stroke pumping unit.

[0021] (3) The endless chain of the present invention is maintenance-free. Most of the chains used in current vertical pumping units are sleeve roller plate chains. They have the disadvantages of too high maintenance costs and low strength when used in harsh environments. The present invention adopts a high-strength, durable and reliable endless chain and sprocket, which has the characteristics of being maintenance-free, low in use cost and high in reliability when used in harsh environments. The installation and use accuracy requirements of the endless chain are relatively low, and the chain will not fall off during long-term use; the endless chain can adapt to harsh environments for a long time, such as it can be used in contact with stones, sand, ash, coal, etc.; the single link of the endless chain is a closed ring part, with a simple structure and large self-tensile force; the straight-edge diameter of the endless chain is relatively close to the diameter of the sucker rod; the linear velocity of the endless chain can safely operate at more than 4 m / s.

[0022] (4) The symmetrical endless chains in the double-row sprocket chain mechanism of the present invention form a synchronous trajectory, and the principle imitates the connection and symmetrical force of manual sawing. The counterweight and the reversing mechanism are designed as an integrated structure with a compact structure. Each cycle process of this pumping unit has the function of storing and releasing energy after up and down reversing.

[0023] (5) The whole pumping unit has no large enclosed space. The aerial part is a grid structure with good wind resistance. The whole unit is designed with a modular structure, which is easy to transport. Different strokes of the whole unit can be combined by adding or subtracting the standard lower section. The driving mechanism is designed and installed on the ground, with a low center of gravity and good stability for the whole unit. The reversing mechanism (trajectory driving device) is designed with a universal floating function, which can compensate for errors when the circular chains are asynchronous. The reversing mechanism realizes the universal floating function through a spherical roller bearing and can compensate for errors when the circular chains are asynchronous. All the bearings of the moving parts of the whole unit are in a relatively small sealed space. It is convenient and easy to tension the two circular chains of the whole unit. Description of the Drawings

[0024] Figure 1 is the structural schematic diagram of the present invention (when the reducer is installed in a floor-mounted manner);

[0025] Figure 2 is Figure 1 the partial enlarged schematic diagram at position A in

[0026] Figure 3 is Figure 1 the partial enlarged schematic diagram at position B in

[0027] Figure 4 is the side view schematic diagram of the present invention when the reducer is installed in a suspended manner;

[0028] Figure 5 is Figure 4 the top view schematic diagram of

[0029] Figure 6 is the structural schematic diagram of the installation position of the driven sprocket in the present invention;

[0030] Figure 7 is the structural schematic diagram of the upper reversing energy storage mechanism in the present invention;

[0031] Figure 8 is the structural schematic diagram of the reversing synchronizing shaft with a U-shaped splint in the present invention;

[0032] Figure 9 is the structural schematic diagram of the reversing synchronizing shaft with a ring chain link in the present invention.

[0033] In the figure, 1 - balance counterweight box, 2 - hanger, 3 - driving sprocket, 4 - driven sprocket, 5 - chain, 6 - chassis, 7 - driving section, 8 - lower standard section, 9 - driven section, 10 - upper standard section, 11 - top frame, 12 - guide wheel, 13 - lifting chain, 14 - reversing synchronous shaft, 15 - bearing, 16 - sliding seat, 17 - vertical screw, 18 - buffer pressure plate, 19 - locking nut, 20 - buffer spring, 21 - limit plate, 22 - locking nut I, 23 - vertical screw I, 24 - buffer pressure plate I, 25 - locking nut II, 26 - buffer spring I, 27 - limit plate I, 28 - locking nut III, 29 - motor, 30 - reducer, 31 - steering wheel, 32 - annular groove body, 33 - slider, 34 - T-shaped guide wheel, 35 - U-shaped clamping plate, 36 - mounting bolt, 37 - annular link, 38 - T-shaped guide rail rod, 39 - guide roller, 40 - fixing plate, 41 - through shaft hole, 42 - strip-shaped adjustment hole, 43 - circular outer mounting plate, 44 - L-shaped inner mounting plate, 45 - connecting bolt, 46 - height adjustment bolt. Detailed implementation mode

[0034] A vertical modular closed-type pumping unit, as shown in the attached Figure 1 , the attached Figure 4 , the attached Figure 5 shows, including a frame, a driving mechanism, a transmission mechanism, a balance counterweight box 1 and a hanger 2. The transmission mechanism includes a double-row sprocket chain mechanism composed of two driving sprockets 3, two driven sprockets 4 and two chains 5. The frame includes a chassis 6 and a driving section 7, a lower standard section 8, a driven section 9, an upper standard section 10, and a top frame 11 that are fixedly connected to the upper left side of the chassis 6 and spliced in sequence from bottom to top. The number of the lower standard sections 8 is several. The balance counterweight box 1 is arranged inside the frame, and the balance counterweight box 1 moves vertically between the driving section 7, the lower standard section 8, the driven section 9, and the upper standard section 10 through a guiding mechanism. Two horizontally arranged guide wheels 12 are installed on the top frame 11. The hanger 2 is connected to the top of the balance counterweight box 1 through a lifting chain 13 that passes around the two guide wheels 12.

[0035] As shown in the attached Figure 1 , the attached Figure 4 shows, the two driving sprockets 3 are respectively installed on the front inner side wall and the rear inner side wall of the driving section 7. The two driven sprockets 4 are respectively installed on the front inner side wall and the rear inner side wall of the driven section 9. A longitudinally placed reversing synchronous shaft 14 is connected between the two chains 5. A bearing 15 is installed in the middle of the side wall of the reversing synchronous shaft 14. A horizontally arranged rectangular frame-shaped sliding seat 16 is fixed to the bottom of the balance counterweight box 1. The outer ring of the bearing 15 is slidably connected to the sliding seat 16.

[0036] As shown in the attached Figure 1 , the attached Figure 2 , the attached Figure 7As shown in the figure, an upper commutation energy storage mechanism is provided between the balance counterweight box 1 and the top frame 11. The upper commutation energy storage mechanism includes an adjusting bolt fixedly connected to the bottom of the top frame 11 in the vertical direction and two vertical screws 17 fixedly connected to the top end surface of the balance counterweight box 1 and distributed left and right. A buffer pressure plate 18 whose middle is vertically opposite to the adjusting bolt is movably sleeved on the two vertical screws 17 together. A locking nut 19 is also sleeved on each vertical screw 17 above the buffer pressure plate 18, and a buffer spring 20, a limiting plate 21 and a locking nut I22 are distributed in sequence from top to bottom below the buffer pressure plate 18. The two ends of the buffer spring 20 are respectively connected to the buffer pressure plate 18 and the limiting plate 21;

[0037] As shown in the Figure 1 , Figure 3 figure, a lower commutation energy storage mechanism is provided between the sliding seat 16 and the chassis 6. The lower commutation energy storage mechanism includes an adjusting bolt I fixedly connected to the upper side of the chassis 6 in the vertical direction and two vertical screws I23 fixedly connected to the bottom surface of the sliding seat 16 and distributed left and right. A buffer pressure plate I24 whose middle is vertically opposite to the adjusting bolt I is movably sleeved on the two vertical screws I23 together. A locking nut II25 is also sleeved on each vertical screw I23 below the buffer pressure plate I24, and a buffer spring I26, a limiting plate I27 and a locking nut III28 are distributed in sequence from bottom to top above the buffer pressure plate I24. The two ends of the buffer spring I26 are respectively connected to the buffer pressure plate I24 and the limiting plate I27.

[0038] The present invention adopts a modular design, and modular designs are carried out for the polished rod load, stroke and reducer. In this way, different polished rod loads, strokes and reducers can be quickly combined modularly to form a pumping unit suitable for different working conditions, and modular combination can be carried out at the use site to meet different strokes and pumping frequencies. The present invention adopts the static balance method, and the polished rod and the balance counterweight box are balanced by adding or subtracting counterweight iron in the balance counterweight box 1. Through the upper commutation energy storage mechanism and the lower commutation energy storage mechanism, the energy lost during the commutation of the existing polished rod is fully utilized (energy balance), and adjustment can be carried out when the commutation current of the polished rod appears at a peak value, so as to achieve energy saving of the pumping unit, and further provide a vertical modular closed pumping unit with high mechanical efficiency, low energy consumption, and capable of meeting the use of general oil fields and special oil fields.

[0039] In the present invention, the frame is designed modularly, enabling the stroke of the pumping unit to be adjusted according to on-site requirements. The structural design of the commutation synchronization shaft 14, the balance weight box 1, the upper commutation energy storage mechanism, and the lower commutation energy storage mechanism in the present invention can, firstly, adjust the balance weight so that the weight of the balance weight box 1 is balanced with the gravity of the pump rod and the load. When the pumping unit is working, the gravity of the pump rod during its upward and downward movement is equal to that of the balance weight box 1, manifested as the currents of the upper and lower strokes being basically equal. Secondly, the adjustable energy storage and release are achieved through the upper commutation energy storage mechanism and the lower commutation energy storage mechanism. The adjustment of the energy can be realized by adjusting the heights of the adjusting bolt and the adjusting bolt I.

[0040] During operation, driven by the driving mechanism, the two driving sprockets 3 rotate synchronously, causing the two chains 5 to perform a closed-loop movement, driving the commutation synchronization shaft 14 to perform an up-and-down closed-loop movement. During the upward movement of the commutation synchronization shaft 14, the pump rod is driven to descend through the chain 5. During this process, the balance weight box 1 rises under the action of the commutation synchronization shaft 14, playing a counterweight role in the descent of the pump rod. During the downward movement of the commutation synchronization shaft 14, the pump rod is driven to rise by gravity and the chain 5. During this process, the balance weight box 1 descends under the action of the commutation synchronization shaft 14 and its own weight, playing a counterweight role in the ascent of the pump rod. The commutation synchronization shaft 14 performs a closed-loop movement with the chain 5, thereby realizing the up-and-down reciprocating movement of the pump rod. During the entire movement process, the commutation synchronization shaft 14 only bears the pulling force of the chain 5 and does not participate in the gravity balance between the balance weight box 1 and the pump rod. During operation, the distance between the driving sprocket 3 and the driven sprocket 4 determines the stroke of the pumping unit. Generally, when adjusting the stroke, the position of the driven sprocket 4 is adjusted by increasing or decreasing the number of lower standard sections 8. When designing and manufacturing the pumping unit, the number of lower standard sections 8 determines the stroke of the pumping unit. By increasing or decreasing the number of lower standard sections 8, a pumping unit with strokes of 4 m, 6 m, 8 m, 10 m, 12 m, 14 m, and 16 m can be freely combined.

[0041] During the operation process, the working principles of the upper commutation energy storage mechanism and the lower commutation energy storage mechanism are as follows: a) When the balance counterweight box 1 and the sucker rod are about to change direction from motion to stop, when the balance counterweight box 1 changes from normal upward movement to stop, that is, when the sucker rod changes from normal downward movement to stop, energy is stored in the upper commutation energy storage mechanism. b) When the balance counterweight box 1 and the sucker rod are about to change direction from stop to start moving: when the balance counterweight box 1 changes from stop to normal downward movement, that is, when the sucker rod changes from stop to normal upward movement, the energy in the upper commutation energy storage mechanism is released to balance the starting acceleration of the balance counterweight box 1 and the sucker rod. c) When the balance counterweight box 1 and the sucker rod are about to change direction from motion to stop: when the balance counterweight box 1 changes from normal downward movement to stop, that is, when the sucker rod changes from normal upward movement to stop, the lower commutation energy storage mechanism stores energy. d) When the balance counterweight box 1 and the sucker rod are about to change direction from stop to start moving: when the balance counterweight box 1 changes from stop to normal upward movement, that is, when the sucker rod changes from stop to normal downward movement, the energy in the lower commutation energy storage mechanism is released to balance the starting acceleration of the balance counterweight box 1 and the sucker rod. The energy saved in each cycle of the above four steps may not be much, but the long-term operation benefit is considerable. During the whole oil pumping process, the oil pumping machine stores and releases energy twice in each cycle. By adjusting the heights of the adjusting bolt and the adjusting bolt I to adjust the amount of stored and released energy, the peak current during the commutation of the oil pumping machine is close to the rated current, thus achieving the effect of energy saving.

[0042] As shown in the attached Figure 1 , the attached Figure 4 , the attached Figure 5 figures, the driving mechanism includes a motor 29 installed on the upper right side of the chassis 6 and two speed reducers 30 installed on the front side and the rear side of the driven section 9. The input shafts of the two speed reducers 30 are coaxially arranged and connected as a whole. The input shaft of the speed reducer 30 on the front side is connected to the output shaft of the motor 29 through belt drive.

[0043] It should be noted that the installation method of the speed reducer 30 can be selected as the floor-mounted installation and the suspended installation. When installed in the floor-mounted manner, the seats of the two speed reducers 30 are respectively fixedly connected to the left front part and the left rear part of the chassis 6 through expansion bolts, as shown in the attached Figure 1 figures; when installed in the suspended manner, the seats of the two speed reducers 30 are respectively fixedly connected to the front surface and the rear surface of the driven section 9 at the bottom through installation bolts I, as shown in the attached Figure 4 , the attached Figure 5 figures.

[0044] During installation, an electrical cabinet is arranged beside the motor 29 to control the driving mechanism. The structures of the two speed reducers 30 can be replaced with a combination structure of one speed reducer and double sprockets. During operation, the motor 29 drives the two driving sprockets 3 to rotate synchronously through the speed reducer 30.

[0045] As shown in the attachedFigure 1 , attached Figure 4 , attached Figure 5 As shown in Figure 5 , a direction wheel 31 which is longitudinally placed and located between the vertical screws 17 is installed on the top surface of the balance weight box 1. Two annular grooves 32 are fixed on the side surface of each guide wheel 12. The head end of the lifting chain 13 is fixedly connected to the front part of the suspension rope device 2. The tail end of the lifting chain 13 successively winds around the two annular grooves 32 located on the front side, the direction wheel 31, the two annular grooves 32 located on the rear side, and is fixedly connected to the rear part of the suspension rope device 2.

[0046] In the present invention, the lifting chain 13 can replace steel wire ropes, lifting ropes or braided ropes, and has the advantages of high strength and maintenance-free.

[0047] As attached Figure 1 , attached Figure 3 , attached Figure 8 As shown in Figure 8 , a horizontally upright slider 33 located in the inner cavity of the sliding seat 16 is fixed outside the bearing 15. Four pairs of T-shaped guide wheels 34 are installed at the four corners of the slider 33. The four T-shaped guide wheels 34 located on the front side are in rolling contact with the front frame edge of the sliding seat 16; the four T-shaped guide wheels 34 located on the rear side are in rolling contact with the rear frame edge of the sliding seat 16.

[0048] As attached Figure 8 As shown in Figure 8 , U-shaped clamping plates 35 are fixed at both ends of the reversing synchronous shaft 14. One link of the chain 5 is clamped in the inner cavity of the U-shaped clamping plate 35, and a movable block located inside the link is fixedly connected between the two side plates of the U-shaped clamping plate 35 through a mounting bolt 36.

[0049] This structural design realizes the detachable connection between the reversing synchronous shaft 14 and the chain 5, which is convenient for maintenance.

[0050] As attached Figure 9 As shown in Figure 9 , the reversing synchronous shaft 14 is connected to the chain 5 through an annular link 37 welded to its end.

[0051] As attached Figure 1 , attached Figure 4 As shown in Figure 4 , two T-shaped guide rail rods 38 which are vertically arranged and distributed left and right are commonly fixed on the inner side walls of the active section 7, the lower standard section 8, the driven section 9, and the upper standard section 10; the guiding mechanism is four guiding rollers 39 installed at the corners of the balance weight box 1 and in rolling contact with the T-shaped guide rail rods 38 or four U-shaped sliders fixedly connected to the corners of the balance weight box 1 and in sliding contact with the T-shaped guide rail rods 38.

[0052] As attached Figure 1 , attached Figure 2 , attached Figure 6As shown in the figure, fixing plates 40 are fixed to both the front side wall and the rear side wall of the driven section 9. Oval shaft-passing holes 41 and several strip-shaped adjustment holes 42 are formed in the fixing plates 40. The axle of the driven sprocket 4 passes through the shaft-passing hole 41, and circular outer mounting plates 43 and L-shaped inner mounting plates 44 distributed on both sides of the fixing plate 40 are fixedly sleeved on the axle of the driven sprocket 4. A plurality of connecting bolts 45 passing through the strip-shaped adjustment holes 42 are connected between the circular outer mounting plates 43 and the L-shaped inner mounting plates 44. Two height adjustment bolts 46 are arranged vertically between the horizontal plate of the L-shaped inner mounting plate 44 and the driven section 9.

[0053] This structural design realizes the adjustment of the position of the driven sprocket 4. Firstly, it is convenient for the tensioning of the double-row sprocket chain mechanism. Secondly, the position of the driven sprocket 4 can be adjusted after long-term operation to ensure the operation reliability.

[0054] The bearing 15 is a spherical roller bearing; the chain 5 and the hanging chain 13 are both ring chains.

[0055] By adopting high-strength and durable ring chains and sprockets, the present invention increases the structural strength while eliminating the process of frequent maintenance and is maintenance-free even in harsh environments. The spherical roller bearing enables the connection of the reversing synchronous shaft 14 to have a universal floating function, which can compensate for errors when the ring chains are asynchronous.

[0056] In the specific implementation process, mounting plates with mounting holes are arranged on both the front side wall and the rear side wall of the driving section 7, and the axles of the two driving sprockets 3 respectively pass through the two mounting holes. In the present invention, the two guide wheels 12 can be replaced by a large guiding wheel to achieve the balance of the hanging chain 13. The underframe 6 and the driving section 7, the driving section 7 and the lower standard section 8, the lower standard section 8 and the lower standard section 8, the lower standard section 8 and the driven section 9, the driven section 9 and the upper standard section 10, and the upper standard section 10 and the top frame 11 are all detachably connected by four connecting pins distributed in a rectangle.

[0057] In the present invention, the top frame 11 includes a rectangular base located at the bottom and connected to the upper standard section 10 and a slender top frame body located at the upper part. The rectangular base and the top frame body are detachably connected by several mounting plates and bolts. When connecting, by adjusting the mounting positions of the mounting plates and bolts, the position fine-tuning of the top frame body in the front-back direction and the left-right direction can be realized for installation and wellhead alignment.

[0058] The present invention is easy to realize load-limiting intelligent control. The control system of this machine can use a load-limiting contactor to realize load-limiting intelligent control. Since the working tension does not directly participate in the force between the balance counterweight box 1 and the sucker rod, the tension of the reversing synchronous shaft is easy to control, and it is easy to limit the load within one cycle to protect the pumping unit and the electrical system.

[0059] The present invention can cooperate with existing anti-falling devices to achieve the anti-falling function of the balance counterweight box 1. When the sucker rod loses load, the balance counterweight box 1 can be instantaneously braked to prevent accidents from occurring.

[0060] The counterweight iron in the present invention can be replaced with a liquid whose volume can be flexibly adjusted to achieve dynamic balance, and then the counterweight (increase or decrease of the counterweight) can be adjusted according to the current change of checking the up and down strokes of the sucker rod.

[0061] The frame structure of the present invention can be adjusted according to the needs of inclined wells or horizontal wells, and non-standard section structures can be spliced in the frame when necessary.

Claims

1. A vertical modular closed-type pumping unit, comprising a frame, a driving mechanism, a transmission mechanism, a balance counterweight box (1) and a suspension rope device (2), wherein the transmission mechanism comprises a double-row sprocket chain mechanism composed of two driving sprockets (3), two driven sprockets (4) and two chains (5); characterized in that: The frame includes a chassis (6) and an active section (7), a lower standard section (8), a driven section (9), an upper standard section (10), and a top frame (11) that are fixedly connected to the upper left side of the chassis (6) and spliced in sequence from bottom to top. The number of the lower standard sections (8) is several; a balance counterweight box (1) is arranged inside the frame, and the balance counterweight box (1) moves vertically between the active section (7), the lower standard section (8), the driven section (9), and the upper standard section (10) through a guiding mechanism; two guiding wheels (12) that are horizontally arranged and distributed left and right are installed on the top frame (11), and a suspension device (2) is connected to the top of the balance counterweight box (1) through a suspension chain (13) that passes around the two guiding wheels (12). Two driving sprockets (3) are respectively installed on the front inner side wall and the rear inner side wall of the active section (7); two driven sprockets (4) are respectively installed on the front inner side wall and the rear inner side wall of the driven section (9); a longitudinally placed reversing synchronous shaft (14) is connected between the two chains (5), a bearing (15) is installed in the middle of the side wall of the reversing synchronous shaft (14), and a horizontally arranged rectangular frame-shaped sliding seat (16) is fixedly connected to the bottom of the balance counterweight box (1), and the outer ring of the bearing (15) is slidably connected to the sliding seat (16). An upper reversing energy storage mechanism is arranged between the balance counterweight box (1) and the top frame (11). The upper reversing energy storage mechanism includes an adjusting bolt fixedly connected vertically to the bottom of the top frame (11) and two vertical screws (17) fixedly connected to the top end surface of the balance counterweight box (1) and distributed left and right. A buffer pressure plate (18) whose middle is vertically opposite to the adjusting bolt is movably sleeved on the two vertical screws (17). A locking nut (19) is also sleeved on each vertical screw (17) on the upper side of the buffer pressure plate (18), and a buffer spring (20), a limiting plate (21), and a locking nut I (22) that are distributed in sequence from top to bottom are sleeved on the lower side of the buffer pressure plate (18); the two ends of the buffer spring (20) are respectively connected to the buffer pressure plate (18) and the limiting plate (21). A lower reversing energy storage mechanism is arranged between the sliding seat (16) and the chassis (6). The lower reversing energy storage mechanism includes an adjusting bolt I fixedly connected vertically to the upper side of the chassis (6) and two vertical screws I (23) fixedly connected to the bottom surface of the sliding seat (16) and distributed left and right. A buffer pressure plate I (24) whose middle is vertically opposite to the adjusting bolt I is movably sleeved on the two vertical screws I (23). A locking nut II (25) is also sleeved on each vertical screw I (23) on the lower side of the buffer pressure plate I (24), and a buffer spring I (26), a limiting plate I (27), and a locking nut III (28) that are distributed in sequence from bottom to top are sleeved on the upper side of the buffer pressure plate I (24); the two ends of the buffer spring I (26) are respectively connected to the buffer pressure plate I (24) and the limiting plate I (27). Mounting plates with mounting holes are arranged on both the front side wall and the rear side wall of the active section (7), and the axles of the two driving sprockets (3) respectively pass through the two mounting holes.

2. The vertical modular closed pumping unit according to claim 1, wherein: The driving mechanism includes a motor (29) installed on the upper right side of the chassis (6) and two speed reducers (30) installed on the front side and the rear side of the driven section (9). The input shafts of the two speed reducers (30) are coaxially arranged and connected as a whole. The input shaft of the speed reducer (30) located on the front side is drivingly connected to the output shaft of the motor (29).

3. The vertical modular closed pumping unit according to claim 1, wherein: A steering wheel (31) longitudinally placed and located between the vertical screws (17) is installed on the top surface of the balance counterweight box (1). Two annular grooves (32) are fixed on the side surface of each guide wheel (12). The head end of the hanging chain (13) is fixedly connected to the front part of the suspension rope device (2). The tail end of the hanging chain (13) sequentially winds around the two annular grooves (32) located on the front side, the steering wheel (31), the two annular grooves (32) located on the rear side, and is fixedly connected to the rear part of the suspension rope device (2).

4. The vertical modular closed pumping unit according to claim 1, characterized in that: A horizontally upright slider (33) located in the inner cavity of the sliding seat (16) is fixed to the outside of the bearing (15). Four pairs of T-shaped guide wheels (34) are installed at the four corners of the slider (33). The four T-shaped guide wheels (34) located on the front side are in rolling contact with the front frame edge of the sliding seat (16); the four T-shaped guide wheels (34) located on the rear side are in rolling contact with the rear frame edge of the sliding seat (16).

5. The vertical modular closed pumping unit according to claim 1, characterized in that: U-shaped clamping plates (35) are fixed to both ends of the reversing synchronous shaft (14). One link of the chain (5) is clamped in the inner cavity of the U-shaped clamping plate (35), and a movable block located inside the link is fixedly connected between the two side plates of the U-shaped clamping plate (35) through a mounting bolt (36).

6. The vertical modular closed pumping unit according to claim 1, wherein: The reversing synchronous shaft (14) is connected to the chain (5) through an annular link (37) welded to its end.

7. A vertical modular closed-type pumping unit according to claim 1, characterized in that: Two T-shaped guide rail rods (38) arranged vertically and distributed left and right are jointly fixed to the inner side walls of the active section (7), the lower standard section (8), the driven section (9), and the upper standard section (10); the guiding mechanism is four guiding rollers (39) installed at the corners of the balance counterweight box (1) and in rolling contact with the T-shaped guide rail rods (38) or four U-shaped sliders fixedly connected to the corners of the balance counterweight box (1) and in sliding contact with the T-shaped guide rail rods (38).

8. A vertical modular closed pumping unit according to claim 1, characterized in that: Fixing plates (40) are fixed to both the front side wall and the rear side wall of the driven section (9). Oval shaft-passing holes (41) and several strip-shaped adjustment holes (42) are formed in the fixing plates (40); the axle of the driven sprocket (4) passes through the shaft-passing hole (41), and a circular outer mounting plate (43) and an L-shaped inner mounting plate (44) distributed on both sides of the fixing plate (40) are fixedly sleeved on the axle of the driven sprocket (4). A plurality of connecting bolts (45) passing through the strip-shaped adjustment holes (42) are connected between the circular outer mounting plate (43) and the L-shaped inner mounting plate (44); two height adjustment bolts (46) are arranged vertically between the horizontal plate of the L-shaped inner mounting plate (44) and the driven section (9).

9. The vertical modular closed pumping unit according to claim 1, characterized in that: The bearing (15) is a spherical roller bearing; the chain (5) and the hanging chain (13) are both ring chains.

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