Lubrication system device for oilfield pumping unit

Abstract

This invention discloses a lubrication system device for oilfield pumping units, belonging to the field of lubrication technology. The device includes a lubrication control box and external lubrication pipelines. The lubrication control box houses a two-stage, multi-channel, separately controlled lubrication pump, comprising a rotary lubrication pump and multiple follow-up adjustable piston metering pumps. The rotary lubrication pump drives the piston sleeves of each metering pump in reciprocating motion. Each metering pump has a built-in independent oil volume adjustment mechanism for precisely setting the single-output oil volume at the corresponding lubrication point. Furthermore, each metering pump is directly driven by mechanical power without relying on pipeline back pressure. This invention avoids the pressure loss caused by the passive obstruction of adjustment in traditional distributors, ensuring that both high and low lubrication points receive the required pumping pressure and oil volume. Simultaneously, the metering pumps and rotary pumps maintain mechanical linkage, resulting in reliable operation and high repeatability, making it suitable for long-term continuous operation in oilfields.

Description

Technical Field

[0001] This invention belongs to the field of lubrication technology, specifically relating to a lubrication system device for oilfield pumping units. Background Technology

[0002] Oil pumping units are core equipment in oilfield development, operating continuously in the field for extended periods. Reliable lubrication of all moving parts directly affects the equipment's lifespan and operational efficiency. For example... Figure 1 As shown, the structure of an oil pumping unit typically includes multiple lubrication points that require regular grease replenishment, such as motor shaft lubrication point 5, crank lubrication point 4, tail shaft lubrication point 2, and central shaft lubrication point 3. These lubrication points are located at different elevations, and the on-site working conditions are complex.

[0003] Traditional methods rely on manual, portable lubrication pumps to periodically lubricate each lubrication point's pre-installed pipeline. This is not only labor-intensive and inefficient, but also prone to problems such as missed, excessive, or insufficient lubrication. To overcome these shortcomings, some sites have introduced centralized lubrication pump stations controlled by PLCs. These stations use a single lubrication pump in conjunction with an adjustable distributor to distribute oil. The distributor controls the output of each branch by adjusting its internal damping, and finally, the lubricating oil is delivered to each lubrication point at regular intervals and in measured quantities through pipelines. However, the pumping unit itself is quite tall, and the pumping pressure required for high-level lubrication points such as the central and tail shafts is much higher than that for lower points. Furthermore, the required single-use lubrication volume varies significantly between different lubrication points. The passive, resistance-based adjustment method of the adjustable distributor inevitably causes pressure fluctuations and losses within the system pipelines, resulting in insufficient pressure at high-level lubrication points and thus weakening the practical application effect of the centralized lubrication system. Summary of the Invention

[0004] This invention proposes a lubrication system device for oilfield pumping units, the purpose of which is to solve the problem of insufficient pressure at high-level lubrication points and ineffective lubrication caused by the passive obstruction adjustment method of the adjustable distributor in the existing centralized lubrication system.

[0005] The technical solution of this invention is as follows:

[0006] A lubrication system device for an oilfield pumping unit includes a lubrication control box, which is equipped with a pumping and distributing device. The lubrication system device for the oilfield pumping unit also includes an external lubrication pipeline connected to the pumping and distributing device, and the oil outlet of the external lubrication pipeline is located at the lubrication point of the pumping unit.

[0007] The pumping and distribution device is a two-stage multi-channel separately controlled lubrication pump, which includes a rotary lubrication pump and multiple follower adjustable piston metering pumps; the rotary lubrication pump is provided with multiple sets of oil outlets around its perimeter; the oil inlet of the follower adjustable piston metering pump is connected to the oil outlet of the rotary lubrication pump, and the oil outlet of the follower adjustable piston metering pump is connected to the corresponding external lubrication pipeline.

[0008] The follow-up adjustable piston metering pump includes an oil quantity regulating mechanism, a piston sleeve, and a rolling connection assembly. The rotary lubrication pump has an eccentrically rotating annular convex groove inside. The inner end of the piston sleeve is connected to the annular convex groove through the rolling connection assembly. Driven by the rotary lubrication pump, the follow-up adjustable piston metering pump outputs lubricating oil according to the oil quantity set by the oil quantity regulating mechanism.

[0009] As a further improvement to the lubrication system device for the oilfield pumping unit: the rotary lubrication pump also includes a housing, a drive shaft, a rotor, a cam sleeve, and a sliding partition. The drive shaft is mounted on the housing via a rotatable connection and is used to connect to a drive motor.

[0010] The rotor is connected to the drive shaft and is located inside the cam sleeve;

[0011] The cam sleeve is mounted in the housing via a rotatable connection. The rotation axis of the cam sleeve is eccentrically set relative to the rotor. The outer circular surface of the rotor contacts and fits with the inner circular surface of the cam sleeve. An eccentric oil cavity is formed between the rotor and the cam sleeve, and a transition oil cavity is formed between the cam sleeve and the housing. The cam sleeve is provided with a pumping oil outlet hole that connects the eccentric oil cavity and the transition oil cavity.

[0012] The outer end of the sliding partition is fixedly connected to the inner wall of the cam sleeve, and the inner end is slidably engaged with the rotor to achieve the division of the eccentric oil chamber;

[0013] A central oil chamber is provided at the center of the rotor. The central oil chamber is connected to the oil inlet of the rotary lubrication pump. The central oil chamber is connected to the eccentric oil chamber through a radial oil passage provided on the rotor. An on / off valve column and a first spring for pushing the on / off valve column outward so that the outer end of the on / off valve column keeps in contact with the inner circular surface of the cam sleeve are installed in the radial oil passage.

[0014] The pump outlet and the on / off valve are located on both sides of the sliding partition.

[0015] As a further improvement to the lubrication system device for the oilfield pumping unit: the annular convex groove is provided on the cam sleeve.

[0016] As a further improvement to the lubrication system device for the oilfield pumping unit: the oil quantity regulating mechanism includes a piston nut and an regulating float valve column;

[0017] The follow-up adjustable piston metering pump also includes a cylinder, a limit plate, a float valve cylinder, and a float valve core;

[0018] The oil inlet of the follow-up adjustable piston metering pump is located at the right end of the cylinder body, and a lubrication oil outlet channel is provided in the radial direction in the middle of the cylinder body. The lubrication oil outlet channel is connected to the oil outlet of the follow-up adjustable piston metering pump.

[0019] The limiting plate is installed on the right end of the cylinder body by a locking nut, and the outer edge of the limiting plate forms a through groove with the inner wall of the cylinder body; the middle part of the limiting plate is also provided with a first through hole for oil inlet; the left end of the piston sleeve is slidably engaged with the inner hole of the cylinder body, and the right end passes through the through groove and is slidably engaged with the through groove; the right end of the piston sleeve is connected to the rolling connection assembly.

[0020] The float valve cylinder is installed in the inner hole of the piston sleeve by a sliding fit and is located between the left end face of the piston sleeve and the limiting plate; a spring limiting ring is installed at the right end of the float valve cylinder, and a second through hole for oil inlet is also opened in the middle of the spring limiting ring.

[0021] The right end of the adjusting float valve column passes through the left end face of the piston sleeve and connects to the left end of the float valve cylinder; the external thread of the adjusting float valve column is threadedly engaged with the piston nut located in the inner bore of the cylinder and on the left side of the piston sleeve, and the piston nut and the inner bore of the cylinder are in a linear sliding fit; the left end of the adjusting float valve column is also connected to a third fastening nut; the piston nut is provided with a through oil guide hole.

[0022] The regulating float valve column is also provided with a middle oil hole. The right end of the middle oil hole is connected to the right end face of the regulating float valve column, and the left end is connected to the cavity where the piston nut is located. A one-way valve is installed in the middle oil hole, and the conduction direction of the one-way valve is from right to left.

[0023] The float valve core is disposed in the float valve cylinder, and a skirt extending to the left is provided on the outer circular surface of the left end of the float valve core; a third spring for pushing the float valve core to the left is also installed in the float valve cylinder.

[0024] As a further improvement to the lubrication system device for the oilfield pumping unit: an overflow valve is also connected to the left end of the cylinder body. The overflow valve includes a valve body, an overflow valve core installed in the valve body, and a second spring installed in the valve body for pushing the overflow valve core to the right to block the overflow port at the left end of the cylinder body.

[0025] The overflow valve is also equipped with a proximity switch for sensing the overflow valve core.

[0026] As a further improvement to the lubrication system device for the oilfield pumping unit, an electromagnetic induction device for sensing the piston sleeve is also installed on the outside of the cylinder body.

[0027] As a further improvement to the lubrication system device for the oilfield pumping unit: an electrical device is also installed inside the lubrication control box, and the lubrication system device for the oilfield pumping unit also includes a power cable electrically connected to the electrical device;

[0028] The bottom plate of the lubrication control box is provided with a cable hole for the power cable to pass through, and a cable sealing assembly is installed at the cable hole.

[0029] As a further improvement to the lubrication system device for the oilfield pumping unit: the cable sealing assembly includes an upper insulating sleeve, a lower insulating sleeve, an insulating joint seat, a first fastening nut, a first sealing gasket, a second sealing gasket, and an insulating nut;

[0030] The power cable passes downward through the upper insulating sleeve and the lower insulating sleeve in sequence. The second sealing gasket is clamped between the flange at the lower end of the upper insulating sleeve and the flange at the upper end of the lower insulating sleeve. The upper insulating sleeve and the lower insulating sleeve are both located in the inner hole of the insulating connector seat. The insulating nut is installed at the lower end of the insulating connector seat and presses the upper insulating sleeve and the lower insulating sleeve upward.

[0031] The insulating connector extends upward through the cable hole, and the first sealing gasket is clamped between the bottom surface of the base plate of the lubrication control box and the shoulder surface of the insulating connector; the upper end of the insulating connector is threadedly engaged with the first fastening nut.

[0032] As a further improvement to the lubrication system for the oilfield pumping unit:

[0033] The bottom plate of the lubrication control box is provided with an oil output hole, and an oil pipe sealing assembly is installed at the oil output hole. The oil outlet of the follow-up adjustable piston metering pump is connected to the inner end of the oil pipe sealing assembly through the internal lubrication pipeline, and the outer end of the oil pipe sealing assembly is connected to the corresponding external lubrication pipeline.

[0034] As a further improvement to the lubrication system device for the oilfield pumping unit: the tubing sealing assembly includes a first ferrule fitting assembly, a second ferrule fitting assembly, a fastening screw, a second fastening nut, an upper screw insulating sleeve, a lower screw insulating sleeve, and a third sealing gasket;

[0035] The upper end of the first ferrule assembly is connected to the internal lubrication pipeline, and the lower end of the second ferrule assembly is connected to the external lubrication pipeline; the third sealing gasket is provided between the bottom of the first ferrule assembly and the top surface of the bottom plate of the lubrication control box, and between the top of the second ferrule assembly and the bottom surface of the bottom plate of the lubrication control box.

[0036] The upper screw insulating sleeve is installed in the mounting hole of the bottom flange of the first ferrule connector assembly, and the lower screw insulating sleeve is installed in the mounting hole of the top flange of the second ferrule connector assembly. The upper end of the upper screw insulating sleeve and the lower end of the lower screw insulating sleeve are respectively provided with flanges. The fastening screw passes through the upper screw insulating sleeve and the lower screw insulating sleeve in sequence and is threadedly connected to the second fastening nut below.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. This invention employs a two-stage, multi-channel, separately controlled lubrication pump as the pumping and distribution device. A rotary lubrication pump drives multiple follow-up adjustable piston metering pumps to work collaboratively. Each metering pump independently controls the output oil volume at its corresponding lubrication point, and each metering pump is directly driven by the mechanical power of the rotary lubrication pump without relying on pipeline back pressure. This structure fundamentally avoids the pressure loss problem caused by traditional adjustable distributors that rely on passive obstruction to regulate flow. This ensures that both high-level and low-level lubrication points receive their required pumping pressure and oil volume, effectively solving the problem of ineffective lubrication at high-level lubrication points due to insufficient pressure.

[0039] 2. The adjustable piston metering pump of this invention has an internal oil volume adjustment mechanism. Operators only need to rotate the adjusting float valve column to change the position of the piston nut, thereby precisely setting the output oil volume of each metering pump in a single cycle. Since each metering pump is adjusted independently and does not interfere with others, on-site personnel can set the oil volume according to the actual needs of different lubrication points, resulting in more precise and reliable lubrication. Furthermore, different numbers of adjustable piston metering pumps can be configured according to actual needs, thus flexibly expanding the number of oil outlets, providing good versatility and expansion potential.

[0040] 3. In rotary lubrication pumps, the annular convex groove on the cam sleeve directly drives the reciprocating motion of the piston sleeves of each follower-type adjustable piston metering pump through a rolling connection assembly. This mechanical linkage method ensures that the oil suction and discharge actions of the metering pump are strictly synchronized with the oil circulation of the rotary pump. The entire system does not rely on wear parts such as springs to drive the pistons back to their original position. This not only ensures reliable operation and high repeatability, but also completely eliminates the potential for failure caused by spring fatigue fracture or performance degradation, significantly extending the service life of the lubrication system under long-term continuous operation conditions in the field.

[0041] 4. The rotary lubrication pump of the present invention adopts a structure in which the rotor and the cam sleeve are eccentrically fitted, and a radial oil passage controlled by an on / off valve column and a first spring is set on the rotor. A sliding baffle is used to dynamically divide the eccentric oil chamber. This structure allows the rotary pump to complete one quantitative suction and discharge cycle per revolution. The pump oil volume is determined by the geometric volume of the eccentric oil chamber and is unaffected by pressure fluctuations in the output pipeline, thus providing a stable and repeatable oil supply pressure source for each follower-type adjustable piston metering pump.

[0042] 5. An overflow valve and a proximity switch are also installed at the left end of the cylinder of each servo-adjustable piston metering pump. When abnormal overpressure occurs inside the metering pump due to pipeline blockage or other reasons, the overflow valve core overcomes the force of the second spring to open the overflow port. At the same time, the proximity switch senses the action of the overflow valve core and outputs a signal. This design not only provides safety protection but also promptly reports the fault location to the operator or control system, facilitating rapid troubleshooting.

[0043] 6. An electromagnetic induction device installed on the outside of the piston sleeve can detect the reciprocating motion of the piston sleeve in real time. Combined with the operating logic of the metering pump, it can determine whether there are abnormalities such as jamming or failure of the oil quantity regulating mechanism. This method further enhances the sensing capability of the lubrication system's working status, providing convenient conditions for unmanned or minimally manned operation and maintenance in oilfields.

[0044] 7. The base plate of the lubrication control box is equipped with cable sealing components and oil pipe sealing components. The cable sealing component, through the cooperation of an upper insulating sleeve, a lower insulating sleeve, an insulating joint seat, and multiple layers of sealing gaskets, achieves full sealing insulation where the power cable passes through the box. The oil pipe sealing component, through upper and lower compression fittings, screw insulating sleeves, and sealing gaskets, achieves sealing and electrical isolation where the lubrication pipeline passes through the plate. The above design gives the control box excellent waterproof, moisture-proof, dustproof, and leakage-proof capabilities, making it fully adaptable to the harsh working conditions of oil pumping unit outdoor operations. Attached Figure Description

[0045] Figure 1 This is a structural diagram of the lubrication system device applied to an oil pumping unit.

[0046] Figure 2 This is a schematic diagram of the lubrication control box.

[0047] Figure 3 This is an outline drawing of a two-stage, multi-channel, separately controlled lubrication pump.

[0048] Figure 4 for Figure 2 A magnified view of part A in the middle.

[0049] Figure 5 This is one of the cross-sectional views of a rotary lubrication pump and a follower-type adjustable piston metering pump.

[0050] Figure 6 This is a schematic diagram showing the relative relationships of the rotor, cam sleeve, and sliding partition.

[0051] Figure 7 This is the second cross-sectional view of a rotary lubrication pump and a follower-type adjustable piston metering pump.

[0052] Figure 8 for Figure 7 A magnified view of part B in the middle section.

[0053] Figure 9 This is an exploded view of the main components of a follow-up adjustable piston metering pump.

[0054] Figure 10 This is a schematic diagram of the piston sleeve of the follow-up adjustable piston metering pump when it is moved to the rightmost end in a specific embodiment.

[0055] Figure 11 This is a schematic diagram of the piston sleeve of the follow-up adjustable piston metering pump when it moves to the middle position to the left in a specific embodiment.

[0056] Figure 12 This is a schematic diagram of the piston sleeve of the follow-up adjustable piston metering pump when it is moved to the leftmost end in a specific embodiment.

[0057] Figure 13 This is a schematic diagram of the structure of a follow-up adjustable piston metering pump adjusted to the minimum output oil volume.

[0058] The reference numerals in the figures include:

[0059] 1. Lubrication control box; 2. Tail shaft lubrication point; 3. Middle shaft lubrication point; 4. Crankshaft lubrication point; 5. Motor shaft lubrication point; 6. External lubrication pipeline; 7. Two-stage multi-channel separately controlled lubrication pump; 8. Cable sealing assembly; 9. Oil pipe sealing assembly; 10. Power cable; 11. Upper insulating sleeve; 12. First fastening nut; 13. First sealing gasket; 14. Insulating connector seat; 15. Second sealing gasket; 16. Lower insulating sleeve; 17. Insulating nut; 18. Internal lubrication pipeline; 19. First ferrule connector assembly; 20. Second ferrule connector assembly; 21. Fastening screw; 22. Upper screw insulating sleeve; 23. Third sealing gasket; 24. Lower screw insulating sleeve; 25. Second fastening nut; 26. Oil tank; 27. Follow-up adjustable piston metering pump. 28. Rotary lubrication pump; 29. ​​Housing; 30. Cam sleeve; 31. Annular convex groove; 32. Pumping oil outlet; 33. Sliding partition; 34. On / off valve column; 35. Rotor; 36. Intermediate oil chamber; 37. First spring; 38. Drive shaft; 39. Rolling connection assembly; 40. Piston sleeve; 41. Cylinder body; 42. Overflow valve core; 43. Proximity switch; 44. Second spring; 45. Piston nut; 46. Lubrication oil outlet channel; 47. Adjusting float valve column; 48. Locking screw ring; 49. Limiting plate; 50. Limiting spring screw ring; 51. Float valve core; 52. Third spring; 53. Float valve cylinder; 54. Check valve; 55. Intermediate oil hole; 56. Electromagnetic induction device; 57. Third fastening nut; 58. Oil guide hole. Detailed Implementation

[0060] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0061] A lubrication system device for an oilfield pumping unit, such as Figure 1 As shown, the system includes a lubrication control box 1, which houses a pumping and distributing device. The lubrication system for the oilfield pumping unit also includes an external lubrication pipeline 6 connected to the pumping and distributing device. The outlet of the external lubrication pipeline 6 is located at a lubrication point on the pumping unit. In this embodiment, the lubrication points include a tail shaft lubrication point 2, a central shaft lubrication point 3, a crankshaft lubrication point 4, and a motor shaft lubrication point 5, distributed at different elevations. In practice, the lubrication points on the pumping unit include moving and fixed points. The tail shaft lubrication point 2 and crankshaft lubrication point 4 are moving lubrication points, while the motor shaft lubrication point 5 and central shaft lubrication point 3 are fixed lubrication points. When the external lubrication pipeline 6 connects to the moving lubrication points, a section of flexible tubing is used to accommodate the displacement of the moving parts.

[0062] In this embodiment, the pumping and distribution device is a two-stage, multi-channel, separately controlled lubrication pump 7. For example... Figures 3 to 7 As shown, the two-stage, multi-channel, separately controlled lubrication pump 7 includes a rotary lubrication pump 28 and multiple follower-type adjustable piston metering pumps 27. The rotary lubrication pump 28 has multiple sets of oil outlets around its perimeter. The oil inlet of each follower-type adjustable piston metering pump 27 is connected to the oil outlet of the rotary lubrication pump 28, and the oil outlet of the follower-type adjustable piston metering pump 27 is connected to the corresponding external lubrication pipeline 6. The follower-type adjustable piston metering pump 27 internally includes an oil quantity adjustment mechanism, a piston sleeve 40, and a rolling connection assembly 39. The rotary lubrication pump 28 internally has an eccentrically rotating annular convex groove 31, and the inner end of the piston sleeve 40 is connected to the annular convex groove 31 through the rolling connection assembly 39. During operation, the follower-type adjustable piston metering pump 27, driven by the rotary lubrication pump 28, outputs lubricating oil according to the oil quantity set by the oil quantity adjustment mechanism. The two-stage multi-channel separately controlled lubrication pump 7 also includes an oil tank 26, which is installed on top of the rotary lubrication pump 28. The oil outlet at the bottom of the oil tank 26 is connected to the oil inlet at the top of the rotary lubrication pump 28.

[0063] like Figures 5 to 7As shown, the rotary lubrication pump 28 further includes a housing 29, a drive shaft 38, a rotor 35, a cam sleeve 30, and a sliding partition 33. The drive shaft 38 is mounted on the housing 29 via bearings and is used to connect a drive motor. The rotor 35 is connected to the drive shaft 38 via a key and is located inside the cam sleeve 30. The cam sleeve 30 is mounted in the housing 29 via bearings, and its rotation axis is eccentrically positioned relative to the rotor 35. The outer circular surface of the rotor 35 contacts and engages with the inner circular surface of the cam sleeve 30, forming an eccentric oil cavity between the rotor 35 and the cam sleeve 30, and a transition oil cavity between the cam sleeve 30 and the housing 29. The cam sleeve 30 is provided with a pumping outlet hole 32 connecting the eccentric oil cavity and the transition oil cavity. The aforementioned annular convex groove 31 is provided on the cam sleeve 30. The outer end of the sliding partition 33 is fixedly connected to the inner wall of the cam sleeve 30, and the inner end is slidably engaged with the rotor 35, used to divide the eccentric oil cavity. A central oil chamber 36 is located at the center of the rotor 35. This central oil chamber 36 is connected to the oil inlet of the rotary lubrication pump 28, which is also connected to the oil outlet at the bottom of the oil tank 26. The central oil chamber 36 is connected to an eccentric oil chamber via a radial oil passage on the rotor 35. An on / off valve spool 34 and a first spring 37 for pushing the on / off valve spool 34 outwards are installed in the radial oil passage. The first spring 37 keeps the outer end of the on / off valve spool 34 in contact with the inner circular surface of the cam sleeve 30. The pump outlet 32 ​​and the on / off valve spool 34 are located on both sides of the sliding partition 33.

[0064] The working process of the rotary lubrication pump 28 is described below: The drive motor drives the drive shaft 38 to rotate, the drive shaft 38 drives the rotor 35 to rotate, and the rotor 35 drives the cam sleeve 30 to rotate synchronously through the sliding partition 33. During the rotation, the eccentric oil chamber formed between the rotor 35 and the cam sleeve 30, as well as the two parts separated by the sliding partition 33, increase and decrease in turn, realizing the quantitative oil suction and discharge circulation.

[0065] Specifically, after the sliding baffle 33 passes through the narrowest position (i.e., the contact point) formed by the tangency of the rotor 35 and the cam sleeve 30, the volume of the oil suction chamber enclosed between the sliding baffle 33 and this contact point begins to gradually expand, while the volume of the remaining oil discharge chamber in the eccentric oil chamber decreases accordingly. At this time, the on / off valve spool 34 extends outward under the push of the first spring 37, so that the intermediate oil chamber 36 communicates with the expanding oil suction chamber. As the volume of the oil suction chamber continues to increase, lubricating oil is drawn into the chamber through the oil passage reserved on the on / off valve spool 34; at the same time, due to the continuous compression of the volume, the lubricating oil inside the oil discharge chamber is squeezed and discharged into the transition oil chamber through the pump outlet 32, and finally output outward from the oil outlet of the rotary lubrication pump 28.

[0066] When the sliding baffle 33 rotates to coincide with the aforementioned narrowest position, the entire eccentric oil chamber completely transforms into an oil suction chamber (at which point its volume expands to its maximum value), while the volume of the oil discharge chamber shrinks to zero. At this position, the on / off valve spool 34 is closed due to pressure from the inner wall of the cam sleeve 30. Subsequently, as the sliding baffle 33 continues to rotate past this narrowest position, the original oil suction chamber directly transforms into a new oil discharge chamber, and the newly formed area between the sliding baffle 33 and this narrowest position becomes the oil suction chamber for the next cycle and begins to gradually expand. This cycle repeats continuously; each complete rotation of the rotor 35 completes one standard oil pumping cycle, and the volume of oil pumped in each cycle is exactly equal to the geometric volume of the eccentric oil chamber.

[0067] like Figure 7 , Figure 8 as well as Figure 9 As shown, the oil volume adjustment mechanism of the follow-up adjustable piston metering pump 27 includes a piston nut 45 and an adjusting float valve column 47. The follow-up adjustable piston metering pump 27 also includes a cylinder body 41, a limiting plate 49, a float valve cylinder 53, and a float valve core 51. The oil inlet of the follow-up adjustable piston metering pump 27 is located at the right end of the cylinder body 41. A lubrication oil outlet channel 46 is radially formed in the middle of the cylinder body 41, and this lubrication oil outlet channel 46 is connected to the oil outlet of the follow-up adjustable piston metering pump 27. The limiting plate 49 is installed at the right end of the cylinder body 41 by a locking screw 48. The outer edge of the limiting plate 49 forms a through groove with the inner wall of the cylinder body 41, and a first through hole for oil inlet is also formed in the middle of the limiting plate 49. The left end of the piston sleeve 40 slides in engagement with the inner hole of the cylinder body 41, and the right end passes through the aforementioned through groove and slides in engagement with the through groove. The right end of the piston sleeve 40 is connected to a rolling connecting assembly 39. The rolling connection assembly 39 may specifically include a bearing bracket and a rolling bearing that slides within the annular convex groove 31. Alternatively, the annular convex groove 31 may have an opening at a certain location, with a connecting block installed at the opening via screws. After removing the connecting block, the rolling bearing can be inserted into the annular convex groove 31, and then the connecting block can be reinstalled to prevent the rolling connection assembly 39 from leaving the annular convex groove 31.

[0068] The float valve cylinder 53 is installed in the inner hole of the piston sleeve 40 via a sliding fit, and is located between the left end face of the piston sleeve 40 and the limiting plate 49. A limiting spring ring 50 is installed at the right end of the float valve cylinder 53, and a second through hole for oil inlet is also provided in the middle of the limiting spring ring 50. The right end of the adjusting float valve column 47 passes through the left end face of the piston sleeve 40 and is connected to the left end of the float valve cylinder 53 via a axial elastic retaining ring. This connection is rotatable but cannot move relative to each other. The external thread of the adjusting float valve column 47 is threadedly engaged with a piston nut 45 located in the inner hole of the cylinder body 41 and on the left side of the piston sleeve 40. The piston nut 45 and the inner hole of the cylinder body 41 have a linear sliding fit. A third fastening nut 57 is also connected to the left end of the adjusting float valve column 47 for anti-loosening. The piston nut 45 has a through-hole 58. The regulating float valve column 47 is also provided with a central oil hole 55. The right end of the central oil hole 55 is connected to the right end face of the regulating float valve column 47, and the left end is connected to the cavity where the piston nut 45 is located. A one-way valve 54 is installed in the central oil hole 55, and the conduction direction of the one-way valve 54 is from right to left. The float valve core 51 is set in the float valve cylinder 53. The outer circumference of the left end of the float valve core 51 is provided with a skirt extending to the left. A third spring 52 for pushing the float valve core 51 to the left is also installed in the float valve cylinder 53.

[0069] As a further improvement, such as Figure 7 As shown, a relief valve is also connected to the left end of the cylinder body 41. This relief valve includes a valve body, a relief valve core 42 installed within the valve body, and a second spring 44 installed within the valve body to push the relief valve core 42 to the right to block the overflow port at the left end of the cylinder body 41. A proximity switch 43 is also installed on the relief valve to sense the relief valve core 42. When abnormal overpressure occurs inside the metering pump due to pipeline blockage or other reasons, the relief valve core 42 overcomes the elastic force of the second spring 44 to open the overflow port, and simultaneously the proximity switch 43 senses the movement of the relief valve core 42 and outputs a signal. Additionally, an electromagnetic induction device 56 is installed on the outside of the cylinder body 41 to sense the piston sleeve 40. This electromagnetic induction device 56 can detect the reciprocating motion state of the piston sleeve 40 in real time.

[0070] The following is combined Figures 10 to 12 The working process of the follow-up adjustable piston metering pump 27 following the action of the rotary lubrication pump 28 is described in detail.

[0071] In the initial state, such as Figure 10 As shown, the piston sleeve 40 is at its rightmost extreme position and rests against the limiting plate 49, and the float valve cylinder 53 is also at its rightmost extreme position and rests against the limiting plate 49. The skirt of the float valve core 51 is open, and the float valve core 51 is at its rightmost extreme position, blocking the right oil inlet of the float valve cylinder 53. Let the volume of lubricating oil between the piston sleeve 40 and the float valve core 51 at this time be V0, which is a constant value and does not change with the oil volume adjustment.

[0072] When the piston sleeve 40 begins to move to the left under the drive of the rolling connection assembly 39 and the annular convex groove 31, as Figure 11 As shown, external lubricating oil enters the oil chamber formed by the piston sleeve 40 and the limiting plate 49. The lubricating oil flowing to the left, together with the third spring 52, pushes the float valve core 51 to the left until it contacts the right end of the adjusting float valve column 47, thereby closing the middle oil hole 55. The one-way valve 54 is also closed, and at the same time, the skirt of the float valve core 51 contracts under the pressure of the lubricating oil.

[0073] Starting from the piston sleeve 40 and moving leftward until the piston nut 45 reaches its leftmost end and the left end face of the piston sleeve 40 rests against the right end face of the piston nut 45, a portion of the lubricating oil between the left end face of the piston sleeve 40 and the right end face of the overflow valve is squeezed into the lubrication outlet channel 46. The piston nut 45 has a through-hole 58, allowing lubricating oil on its left side to be squeezed to the right side. The volume of lubricating oil squeezed out during this process is denoted as V1. V1 is a constant value, related only to the dimensions of the piston nut 45 and the cylinder 41, and independent of the adjustment position. Simultaneously, a volume of lubricating oil V2 is drawn into the right cavity of the piston sleeve 40.

[0074] When the piston sleeve 40 reaches the leftmost end and stops moving to the left, as Figure 12 As shown, the lubricating oil on the right side of the piston sleeve 40 no longer tends to flow to the left, and the skirt of the float valve core 51 opens again. Under the action of the third spring 52, the float valve core 51 still rests against the right end of the adjusting float valve column 47, and at this time the volume of lubricating oil between the piston sleeve 40 and the float valve core 51 becomes V0+V2.

[0075] Subsequently, piston sleeve 40 begins to move to the right, while the skirt of float valve core 51 remains open and moves to the right, immediately closing the oil inlet at the right end of float valve cylinder 53. The lubricating oil between piston sleeve 40 and float valve core 51 pushes open the one-way valve 54 in the intermediate oil hole 55, entering the space on the left side of piston sleeve 40 from the right side. At the same time, the pressure generated by piston sleeve 40 moving to the right causes float valve cylinder 53 to move to the right.

[0076] Starting from the piston sleeve 40, the piston sleeve 40 moves to the right until both the piston sleeve 40 and the float valve cylinder 53 reach their rightmost extreme positions. The volume between the left end face of the piston sleeve 40 and the right end face of the relief valve increases by V1. The volume between the piston sleeve 40 and the float valve core 51 is compressed back to V0 from V0+V2. Therefore, a volume of lubricating oil of V2 enters the space on the left side of the piston sleeve 40 through the one-way valve 54. During this process, the volume of the space on the left side of the piston sleeve 40 increases by V1, but it can only draw in lubricating oil of volume V2 from the right side. Therefore, this space will also draw back lubricating oil of V1-V2 from the external output oil circuit.

[0077] Finally, the piston sleeve 40 reaches its rightmost limit position and rests against the limiting plate 49, and the float valve cylinder 53 also reaches its rightmost limit position and rests against the limiting plate 49. The skirt of the float valve core 51 remains open, and the float valve core 51 is located at its rightmost limit position, blocking the right-side oil inlet of the float valve cylinder 53. At this point, the state returns to the initial state, and the volume of lubricating oil between the piston sleeve 40 and the float valve core 51 returns to V0.

[0078] In each complete operating cycle, the actual amount of lubricating oil output is V1 - (V1 - V2), which equals V2. The value of V2 depends on the relative position of the piston sleeve 40 and the float valve core 51 when the piston sleeve 40 is moved to its leftmost position; that is, the position of the piston nut 45 relative to the adjusting float valve column 47. Therefore, to adjust the lubricating oil quantity, simply remove the overflow valve at the left end, unfasten the third fastening nut 57, and then rotate the adjusting float valve column 47 with a screwdriver to adjust the oil quantity. Since the piston nut 45 cannot rotate, it will move relative to the adjusting float valve column 47, thereby adjusting the lubricating oil quantity V2. Figure 13 The image shows the state when the output oil volume is adjusted to the minimum.

[0079] To adapt to the harsh working conditions of open-air operations, the lubrication control box 1 is also equipped with electrical devices. The lubrication system for oilfield pumping units also includes a power cable 10 that is electrically connected to the electrical devices. The bottom plate of the lubrication control box 1 has a cable hole for the power cable 10 to pass through, and a cable sealing assembly 8 is installed at the cable hole. Specifically, as... Figure 4 As shown, the cable sealing assembly 8 includes an upper insulating sleeve 11, a lower insulating sleeve 16, an insulating connector seat 14, a first fastening nut 12, a first sealing gasket 13, a second sealing gasket 15, and an insulating nut 17. The power cable 10 passes downwards through the upper insulating sleeve 11 and the lower insulating sleeve 16 in sequence. The second sealing gasket 15 is clamped between the flange at the lower end of the upper insulating sleeve 11 and the flange at the upper end of the lower insulating sleeve 16. Both the upper insulating sleeve 11 and the lower insulating sleeve 16 are located within the inner hole of the insulating connector seat 14. The insulating nut 17 is installed at the lower end of the insulating connector seat 14, pressing the upper insulating sleeve 11 and the lower insulating sleeve 16 upwards. The insulating connector seat 14 passes upwards through the cable hole. The first sealing gasket 13 is clamped between the bottom surface of the lubrication control box 1's base plate and the shoulder surface of the insulating connector seat 14. The upper end of the insulating connector seat 14 is threadedly engaged with the first fastening nut 12.

[0080] Similarly, the bottom plate of the lubrication control box 1 is also provided with an oil output hole, and an oil pipe sealing assembly 9 is installed at the oil output hole. The oil outlet of the follow-up adjustable piston metering pump 27 is connected to the inner end of the oil pipe sealing assembly 9 through the internal lubrication pipeline 18, and the outer end of the oil pipe sealing assembly 9 is connected to the corresponding external lubrication pipeline 6. Figure 4As shown, the oil pipe sealing assembly 9 includes a first ferrule assembly 19, a second ferrule assembly 20, a fastening screw 21, a second fastening nut 25, an upper screw insulating sleeve 22, a lower screw insulating sleeve 24, and a third sealing gasket 23. The upper end of the first ferrule assembly 19 is connected to the internal lubrication pipeline 18, and the lower end of the second ferrule assembly 20 is connected to the external lubrication pipeline 6. A third sealing gasket 23 is provided between the bottom of the first ferrule assembly 19 and the top surface of the bottom plate of the lubrication control box 1, and between the top of the second ferrule assembly 20 and the bottom surface of the bottom plate of the lubrication control box 1. The upper screw insulating sleeve 22 is disposed in the mounting hole of the bottom flange of the first ferrule assembly 19, and the lower screw insulating sleeve 24 is disposed in the mounting hole of the top flange of the second ferrule assembly 20. The upper end of the upper screw insulating sleeve 22 and the lower end of the lower screw insulating sleeve 24 are respectively provided with flanges. The fastening screw 21 passes through the upper screw insulating sleeve 22 and the lower screw insulating sleeve 24 in sequence and is threadedly connected to the lower second fastening nut 25.

[0081] In addition, the lubrication control box 1 is equipped with a wireless transmission module, which enables remote communication between the lubrication control box 1 and the central control room and mobile terminals, without being limited by transmission distance. The lubrication control box 1 is configured such that when the pump station alarms and no one in the central control room or on the mobile terminal is checking the alarm, the wireless control unit notifies the operator of the alarm via SMS. The lubrication control box 1 also supports wireless connection to mobile phones to adjust and query parameters, and transmits system status, parameter, and other data to the monitoring platform via mobile network for data analysis and judgment. The lubrication control box 1 is equipped with a programmable controller for controlling the operation and stop time of the two-stage multi-channel separately controlled lubrication pump 7, with a timing control range of 1 to 8000 hours. The lubrication control box 1 is also equipped with a low oil level indicator and a forced jog switch, which is used to control the operation and stop of the system under any circumstances.

[0082] It should be noted that, as will be apparent to those skilled in the art, the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics thereof. The scope of the present invention is defined by the claims rather than the foregoing description.

Claims

1. A lubrication system device for an oilfield pumping unit, comprising a lubrication control box (1), wherein a pumping distribution device is provided inside the lubrication control box (1), and the lubrication system device for the oilfield pumping unit further comprising an external lubrication pipeline (6) connected to the pumping distribution device, wherein the oil outlet of the external lubrication pipeline (6) is located at the lubrication point of the pumping unit, characterized in that: The pumping and distribution device is a two-stage multi-channel split-control lubrication pump (7), which includes a rotary lubrication pump (28) and multiple follower adjustable piston metering pumps (27); the rotary lubrication pump (28) is provided with multiple sets of oil outlets around its perimeter; the oil inlet of the follower adjustable piston metering pump (27) is connected to the oil outlet of the rotary lubrication pump (28), and the oil outlet of the follower adjustable piston metering pump (27) is connected to the corresponding external lubrication pipeline (6); The follow-up adjustable piston metering pump (27) includes an oil quantity adjustment mechanism, a piston sleeve (40) and a rolling connection assembly (39). The rotary lubrication pump (28) has an eccentrically rotating annular convex groove (31) inside. The inner end of the piston sleeve (40) is connected to the annular convex groove (31) through the rolling connection assembly (39). The follow-up adjustable piston metering pump (27) outputs lubricating oil according to the oil quantity set by the oil quantity adjustment mechanism under the drive of the rotary lubrication pump (28). The oil quantity regulating mechanism includes a piston nut (45) and a regulating float valve column (47). The follow-up adjustable piston metering pump (27) also includes a cylinder (41), a limit plate (49), a float valve cylinder (53), and a float valve core (51). The oil inlet of the follow-up adjustable piston metering pump (27) is located at the right end of the cylinder body (41). A lubrication oil outlet channel (46) is provided in the middle of the cylinder body (41) in the radial direction. The lubrication oil outlet channel (46) is connected to the oil outlet of the follow-up adjustable piston metering pump (27). The limiting plate (49) is installed on the right end of the cylinder (41) by a locking screw (48), and the outer edge of the limiting plate (49) and the inner wall of the cylinder (41) form a through groove; the middle part of the limiting plate (49) is also provided with a first through hole for oil inlet; the left end of the piston sleeve (40) is slidably engaged with the inner hole of the cylinder (41), and the right part passes through the through groove and is slidably engaged with the through groove; the right end of the piston sleeve (40) is connected to the rolling connection assembly (39). The float valve cylinder (53) is installed in the inner hole of the piston sleeve (40) by sliding fit and is located between the left end face of the piston sleeve (40) and the limiting plate (49); a spring limiting ring (50) is installed at the right end of the float valve cylinder (53), and a second through hole for oil inlet is also opened in the middle of the spring limiting ring (50). The right end of the adjusting float valve column (47) passes through the left end face of the piston sleeve (40) and connects to the left end of the float valve cylinder (53); the external thread of the adjusting float valve column (47) is threadedly engaged with the piston nut (45) located in the inner hole of the cylinder body (41) and on the left side of the piston sleeve (40), and the piston nut (45) and the inner hole of the cylinder body (41) are in a linear sliding fit; the left end of the adjusting float valve column (47) is also connected to a third fastening nut (57); the piston nut (45) is provided with a through oil guide hole (58) on both sides. The regulating float valve column (47) is also provided with a middle oil hole (55). The right end of the middle oil hole (55) is connected to the right end face of the regulating float valve column (47), and the left end is connected to the cavity where the piston nut (45) is located. A one-way valve (54) is installed in the middle oil hole (55). The conduction direction of the one-way valve (54) is from right to left. The float valve core (51) is disposed in the float valve cylinder (53), and a skirt extending to the left is provided on the outer circular surface of the left end of the float valve core (51); a third spring (52) for pushing the float valve core (51) to the left is also installed in the float valve cylinder (53).

2. The lubrication system apparatus for oil field pumping units as claimed in claim 1, wherein: The rotary lubrication pump (28) also includes a housing (29), a drive shaft (38), a rotor (35), a cam sleeve (30), and a sliding partition (33). The drive shaft (38) is mounted on the housing (29) by a rotatable connection and is used to connect a drive motor. The rotor (35) is connected to the drive shaft (38) and is located inside the cam sleeve (30); The cam sleeve (30) is mounted in the housing (29) by a rotatable connection. The rotation axis of the cam sleeve (30) is eccentrically set relative to the rotor (35). The outer circular surface of the rotor (35) is in contact with the inner circular surface of the cam sleeve (30). An eccentric oil cavity is formed between the rotor (35) and the cam sleeve (30). A transition oil cavity is formed between the cam sleeve (30) and the housing (29). The cam sleeve (30) is provided with a pumping oil outlet hole (32) that connects the eccentric oil cavity and the transition oil cavity. The outer end of the sliding partition (33) is fixedly connected to the inner wall of the cam sleeve (30), and the inner end is slidably engaged with the rotor (35) to achieve the division of the eccentric oil cavity; The rotor (35) has an intermediate oil chamber (36) at its center. The intermediate oil chamber (36) is connected to the oil inlet of the rotary lubrication pump (28). The intermediate oil chamber (36) is connected to the eccentric oil chamber through a radial oil passage on the rotor (35). A switch valve (34) and a first spring (37) are installed in the radial oil passage to push the switch valve (34) outward so that the outer end of the switch valve (34) is in contact with the inner circular surface of the cam sleeve (30). The pump outlet (32) and the on / off valve (34) are located on both sides of the sliding partition (33).

3. The lubrication system apparatus for oil field pumping units as recited in claim 2 wherein: The annular convex groove (31) is provided on the cam sleeve (30).

4. The lubrication system apparatus for oil field pumping units as recited in claim 1 wherein: The left end of the cylinder (41) is also connected to an overflow valve, which includes a valve body, an overflow valve core (42) installed in the valve body, and a second spring (44) installed in the valve body for pushing the overflow valve core (42) to the right to block the overflow port at the left end of the cylinder (41). The overflow valve is also equipped with a proximity switch (43) for sensing the overflow valve core (42).

5. The lubrication system apparatus for oil field pumping units as recited in claim 1 wherein: An electromagnetic induction device (56) for sensing the piston sleeve (40) is also installed on the outside of the cylinder (41).

6. The lubrication system apparatus for oil field pumping units as set forth in any of claims 1 to 5, wherein: The lubrication control box (1) is also equipped with an electrical device. The lubrication system device for oilfield pumping units also includes a power cable (10) that is electrically connected to the electrical device. The bottom plate of the lubrication control box (1) is provided with a cable hole for the power cable (10) to pass through, and a cable sealing assembly (8) is installed at the cable hole.

7. The lubrication system apparatus for oil field pumping units as recited in claim 6 wherein: The cable sealing assembly (8) includes an upper insulating sleeve (11), a lower insulating sleeve (16), an insulating joint seat (14), a first fastening nut (12), a first sealing gasket (13), a second sealing gasket (15), and an insulating nut (17). The power cable (10) passes downward through the upper insulating sleeve (11) and the lower insulating sleeve (16) in sequence. The second sealing gasket (15) is sandwiched between the flange at the lower end of the upper insulating sleeve (11) and the flange at the upper end of the lower insulating sleeve (16). The upper insulating sleeve (11) and the lower insulating sleeve (16) are both located in the inner hole of the insulating connector seat (14). The insulating nut (17) is installed at the lower end of the insulating connector seat (14) and presses the upper insulating sleeve (11) and the lower insulating sleeve (16) upward. The insulating connector (14) passes upward through the cable hole, and the first sealing gasket (13) is clamped between the bottom surface of the base plate of the lubrication control box (1) and the shoulder surface of the insulating connector (14); the upper end of the insulating connector (14) is threadedly engaged with the first fastening nut (12).

8. The lubrication system device for oilfield pumping units as described in any one of claims 1 to 5, characterized in that: The bottom plate of the lubrication control box (1) is provided with an oil output hole, and an oil pipe sealing assembly (9) is installed at the oil output hole. The oil outlet of the follow-up adjustable piston metering pump (27) is connected to the inner end of the oil pipe sealing assembly (9) through the internal lubrication pipeline (18), and the outer end of the oil pipe sealing assembly (9) is connected to the corresponding external lubrication pipeline (6).

9. The lubrication system apparatus for oil field pumping units as recited in claim 8 wherein: The tubing sealing assembly (9) includes a first ferrule fitting assembly (19), a second ferrule fitting assembly (20), a fastening screw (21), a second fastening nut (25), an upper screw insulating sleeve (22), a lower screw insulating sleeve (24), and a third sealing gasket (23). The upper end of the first ferrule assembly (19) is connected to the internal lubrication pipeline (18), and the lower end of the second ferrule assembly (20) is connected to the external lubrication pipeline (6); the third sealing gasket (23) is provided between the bottom of the first ferrule assembly (19) and the top surface of the bottom plate of the lubrication control box (1), and between the top of the second ferrule assembly (20) and the bottom surface of the bottom plate of the lubrication control box (1). The upper screw insulating sleeve (22) is installed in the mounting hole of the bottom flange of the first ferrule assembly (19), and the lower screw insulating sleeve (24) is installed in the mounting hole of the top flange of the second ferrule assembly (20). The upper end of the upper screw insulating sleeve (22) and the lower end of the lower screw insulating sleeve (24) are respectively provided with flanges; the fastening screw (21) passes through the upper screw insulating sleeve (22) and the lower screw insulating sleeve (24) in sequence and is threadedly connected to the second fastening nut (25) below.

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