Submersible linear motor load reduction device

Abstract

The application provides a submersible linear motor load reduction device and relates to the technical field of submersible linear motors, which comprises a rack, a submersible linear motor arranged at the bottom of the rack and a load reduction assembly arranged at the middle part of the rack. The load reduction assembly comprises a load reduction shell, a small shaft and a large shaft arranged on the load reduction shell, the small shaft is connected with an extension shaft of the submersible linear motor, a lower plunger is connected with the end of the large shaft, an upper plunger is arranged at the top of the lower plunger, an oil channel is arranged in the middle part of the upper plunger, a plunger cover is arranged at the top of the upper plunger, and the plunger cover, an inner cylinder upper cover and an outer cylinder upper cover are provided with a one-way valve. The diameter square value of the upper plunger is twice that of the lower plunger, so that the load is equal when the plunger rises and falls, and the oil flow is stable. The device drives the plunger to move through the submersible linear motor, realizes continuous oil conveying, has a load reduction effect, is provided with a filter plate and a filter box, effectively filters and removes impurities and ensures production efficiency.

Description

Technical Field

[0001] This invention relates to the field of submersible linear motor technology, and more specifically, to a submersible linear motor load reduction device. Background Technology

[0002] In the application of submersible linear motors, especially during oil transportation, the motor needs to withstand significant loads, which fluctuate frequently with the motor's extension and retraction. This not only affects the motor's lifespan but can also lead to unstable oil flow rates, consequently impacting the efficiency of the entire production system. Traditional load shedding devices are often complex in structure, have limited load shedding effects, and struggle to effectively remove impurities from the well's oil, easily causing blockages and affecting production. Therefore, developing a submersible linear motor load shedding device with a simple structure, good load shedding effect, and effective filtration and impurity removal capabilities is of great significance. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a submersible linear motor load reduction device.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: a submersible linear motor load reduction device, characterized in that: it includes a frame, a submersible linear motor is provided at the bottom of the frame, a load reduction component is provided in the middle of the frame, the load reduction component includes a load reduction shell, the load reduction shell is fixedly provided in the middle of the frame, a small shaft and a large shaft are provided on the load reduction shell, the small shaft is connected to the telescopic shaft of the submersible linear motor, a lower plunger is connected to the end of the large shaft, an upper plunger is provided at the top of the lower plunger, a lower oil passage is provided in the middle of the lower plunger, an upper oil passage is provided in the middle of the upper plunger communicating with the lower oil passage, and a plunger is provided at the top of the upper oil passage. The cap, the upper plunger, has an inner pump cylinder that slides outside the cap. The top of the inner pump cylinder has an inner cylinder upper cover, the bottom of the inner pump cylinder has an inner cylinder lower cover, the bottom of the inner cylinder lower cover has a sealing cylinder, the bottom of the sealing cylinder has an outer cylinder lower cover, the outer pump cylinder is located above the edge of the outer cylinder lower cover and is fixed on the frame, and the top of the outer pump cylinder has an outer cylinder upper cover. The middle part of the plunger cap, the inner cylinder upper cover and the outer cylinder upper cover has a round hole, and the round hole of the plunger cap, the inner cylinder upper cover and the outer cylinder upper cover is equipped with a one-way valve. The bottom of the side wall of the lower plunger has multiple inlet holes for the lower oil passage evenly distributed, and the bottom of the inner pump cylinder has multiple through holes.

[0005] As a preferred embodiment of the present invention, the square value of the upper plunger diameter is twice the square value of the lower plunger diameter.

[0006] As a preferred embodiment of the present invention, the load-reducing shell has a small inner cavity and an outer inner cavity from bottom to top in the middle. The diameter of the outer inner cavity is larger than the diameter of the small inner cavity. The piston block at the upper end of the small shaft is slidably disposed in the small inner cavity. The small shaft extends out from the lower end of the load-reducing shell. The piston block at the lower end of the large shaft is slidably disposed in the outer inner cavity. The large shaft extends out from the upper end of the load-reducing shell. Both the small shaft and the large shaft are tightly sealed with the load-reducing shell.

[0007] As a preferred embodiment of the present invention, the one-way valve includes a fixed plate, which is fixedly disposed on the inner wall of the circular hole of the plunger cover, the inner cylinder cover and the outer cylinder cover. A sliding core is slidably disposed in the middle of the fixed plate, and a valve spring is sleeved on the outside of the sliding core. The two ends of the valve spring are respectively connected to the sliding core and the sliding core. A valve disc is disposed at the upper end of the sliding core, and a sealing gasket that seals with the fixed plate is disposed at the bottom of the valve disc. A valve hole is disposed in the fixed plate.

[0008] As a preferred embodiment of the present invention, a filter plate is provided at the liquid inlet of the lower plunger.

[0009] As a preferred embodiment of the present invention, a support plate is provided around the circular hole of the plunger cover, a plug head is provided on the top of the support plate, and a plug cylinder for inserting the plug head is provided at the bottom of the inner cylinder cover.

[0010] As a preferred embodiment of the present invention, the upper surface of the valve disc of the one-way valve on the plunger cover is provided with a base, the top of the base is provided with a round rod, the upper surface of the plunger cover and the side of the base are provided with a slide seat, a slide rod is slidably provided on the slide seat, one end of the slide rod is provided with a wedge for driving the round rod, the other end of the slide rod is provided with an inclined block, a spring is sleeved on the outside of the slide rod, the two ends of the spring are respectively connected to the slide seat and the inclined block, and the lower surface of the inner cylinder cover is provided with a pressure strip for driving the inclined surface of the inclined block.

[0011] As a preferred embodiment of the present invention, the lower surface of the outer cylinder cover is provided with a filter box, and the middle part of the filter box is provided with a circular hole for the lower plunger to pass through.

[0012] As a preferred embodiment of the present invention, two semi-circular slip rings are symmetrically arranged inside the filter box and at its circular hole. The lower part of the semi-circular slip ring is chamfered. The inner diameter of the semi-circular slip ring is smaller than the inner diameter of the circular hole. Smooth rods are slidably arranged on both sides of the semi-circular slip ring, and the planes of the two semi-circular slip rings are in contact with each other. Springs are provided at both ends of the semi-circular slip rings. Springs are sleeved on the smooth rods, and the ends of the springs are connected to the smooth rods. A semi-circular cutter is provided on the upper surface of the semi-circular slip ring.

[0013] The advantages of this invention compared to the prior art are: (1) The present invention uses a design where the square of the upper plunger diameter is twice the square of the lower plunger diameter, so that the effective area of ​​the lower plunger on the oil is equal when it rises and falls, thereby achieving a balance of rising and falling loads and avoiding failure of the submersible linear motor due to frequent load changes.

[0014] (2) Due to the balanced load, the oil flow rate delivered from the oil pipeline is stable and without fluctuation, which improves the stability and efficiency of oil delivery.

[0015] (3) The lower plug of the present invention is provided with a filter plate at the liquid inlet hole, which can effectively filter impurities in the oil in the well and prevent impurities from entering the device and affecting normal operation.

[0016] (4) When the lower plunger of the present invention rises to the limit position, the one-way valve on the plunger cover can be opened automatically, so that the oil flows back to flush the impurities on the filter plate and stores the impurities in the filter box, so as to avoid the impurities from clogging the filter plate again and improve production efficiency.

[0017] (5) The filter box of the present invention is equipped with a semi-circular cutter. When the filter plate enters the filter box, the semi-circular cutter will not act on the impurities on the filter plate. However, when the filter plate slides out of the filter box, the annular cutter composed of two semi-circular cutters can cut off the stubborn impurities on the filter plate and store them in the filter box, further ensuring the unobstructed flow of the filter plate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the overall cross-section of the present invention.

[0020] Figure 3 This is a schematic diagram of the internal structure of the outer pump cylinder and the inner pump cylinder of the present invention.

[0021] Figure 4 This is a schematic diagram of the one-way valve of the present invention.

[0022] Figure 5 for Figure 2 A magnified view of a portion of point A in the middle.

[0023] Figure 6 for Figure 2 A magnified view of a section at point B.

[0024] Figure 7 for Figure 3 A magnified view of a section at point C.

[0025] Figure 8 This is a schematic diagram of the internal structure of the filter box of the present invention.

[0026] Figure 9This is a schematic diagram of the installation structure of the semi-circular cutter of the present invention.

[0027] Reference numerals: 1-Frame; 2-Submersible linear motor; 3-Load reduction housing; 301-Small inner cavity; 302-Outer inner cavity; 4-Small shaft; 5-Large shaft; 6-Lower plunger; 601-Lower oil passage; 602-Liquid inlet; 7-Upper plunger; 701-Upper oil passage; 8-Plunger cover; 9-Inner pump cylinder; 901-Liquid passage; 10-Upper inner cylinder cover; 11-Lower inner cylinder cover; 12-Sealing cylinder; 13-Lower outer cylinder cover; 14-Outer pump cylinder; 15-Upper outer cylinder cover; 16-Check valve; 1601-Fixed plate ; 1602-Sliding core; 1603-Valve spring; 1604-Valve disc; 1605-Sealing gasket; 1606-Valve hole; 17-Filter plate; 18-Support plate; 19-Plug head; 20-Plug cylinder; 21-Base; 22-Round rod; 23-Sliding seat; 24-Sliding rod; 25-Wedge block; 26-Inclined block; 27-Spring one; 28-Pressure strip; 29-Filter box; 30-Semi-circular slip ring; 3001-Chamfer; 31-Smooth rod; 32-Spring two; 33-Semi-circular cutter; 34-Oil pipe. Detailed Implementation

[0028] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0029] Example: Please refer to Figure 1-9 Structural diagram; the present invention provides the following technical solution: A submersible linear motor unloading device includes a frame 1. A submersible linear motor 2 is mounted at the bottom of the frame 1. An unloading assembly is located in the middle of the frame 1. The unloading assembly includes an unloading shell 3, which is fixedly mounted in the middle of the frame 1. A small shaft 4 and a large shaft 5 are mounted on the unloading shell 3. The small shaft 4 is connected to the telescopic shaft of the submersible linear motor 2. A lower plunger 6 is connected to the end of the large shaft 5. An upper plunger 7 is located at the top of the lower plunger 6. A lower oil passage 601 is located in the middle of the lower plunger 6. The upper plunger 7 has a portion that communicates with the lower oil passage 601 in the middle. The upper oil passage 701 has a plunger cover 8 at its top. An inner pump cylinder 9 is slidably provided on the outside of the upper plunger 7. An inner cylinder upper cover 10 is provided on the top of the inner pump cylinder 9. An inner cylinder lower cover 11 is provided at the bottom of the inner cylinder lower cover 11. A sealing cylinder 12 is provided at the bottom of the sealing cylinder 12. An outer cylinder lower cover 13 is provided at the bottom of the sealing cylinder 12. An outer pump cylinder 14 is provided above the edge of the outer cylinder lower cover 13 and is fixedly mounted on the frame 1. An outer cylinder upper cover 15 is provided on the top of the outer pump cylinder 14 and is connected to the oil delivery pipe 34.

[0030] The plunger cover 8, the inner cylinder cover 10, and the outer cylinder cover 15 are provided with a round hole in the middle part, and each of the round holes of the plunger cover 8, the inner cylinder cover 10, and the outer cylinder cover 15 is provided with a one-way valve 16. The one-way valve 16 only allows the oil to move from the bottom to the top, but does not allow the oil to move from the top to the bottom.

[0031] The bottom of the side wall of the lower plunger 6 is provided with a plurality of inlet holes 602 that are connected to the lower oil passage 601, and the bottom of the inner pump cylinder 9 is provided with a plurality of through holes 901.

[0032] Specifically, the submersible linear motor 2 provides power to extend and retract its telescopic shaft, transmitting power through the load reduction assembly to cause the lower plunger 6 to extend and retract. When the lower plunger 6 moves upward, it carries the upper plunger 7 and the plunger cover 8 upward synchronously. The oil inside the inner pump cylinder 9, located between the plunger cover 8 and the inner cylinder upper cover 10, is squeezed by the plunger cover 8 and flows from the one-way valve 16 on the inner cylinder upper cover 10 into the interior of the outer pump cylinder 14. Part of the oil enters the interior of the inner pump cylinder 9 through the fluid passage 901, while the other part enters the oil delivery pipe 34 through the one-way valve 16 on the outer cylinder upper cover 15, completing the oil delivery. When the lower plunger 6 moves downward, the lower plunger 6, along with the upper plunger 7 and the plunger cover 8, descends synchronously. The oil in the inner pump barrel 9, located below the upper plunger 7, is squeezed by the lower surface of the upper plunger 7 and is transported back to the inner pump barrel 14 through the fluid passage 901. Since the oil cannot be transported from the top to the bottom of the inner barrel cover 10, the oil passes through the one-way valve 16 on the outer barrel cover 15 and enters the oil delivery pipe 34 again, continuously completing the oil delivery. At the same time, due to the synchronous descent of the upper plunger 7, the volume between the plunger cover 8 and the inner barrel cover 10 increases, creating a negative pressure that draws the oil in the well from the fluid inlet 602, and then through the lower oil passage 601, the upper oil passage 701, and the one-way valve 16 on the plunger cover 8 into the space between the plunger cover 8 and the inner barrel cover 10. By repeatedly extending and retracting the submersible linear motor 2, oil can be continuously transported from the oil pipe 34 to the ground. When the lower plunger 6 rises, a portion of the oil acts on the lower surface of the upper plunger 7, thus reducing the load.

[0033] The square of the diameter of the upper plunger 7 is twice the square of the diameter of the lower plunger 6. That is, when the lower plunger 6 rises, the effective area of ​​the oil between the plunger cover 8 and the inner cylinder cover 10 is twice the effective area of ​​the oil below the upper plunger 7. In other words, the effective area of ​​the oil is equal when the lower plunger 6 rises and falls, which can achieve equal load when the lower plunger 6 rises and falls. Moreover, the flow rate of the oil transported from the oil pipe 34 is stable and without fluctuation, and the failure of the submersible linear motor 2 due to frequent load changes is avoided.

[0034] The load-reducing shell 3 has a small inner cavity 301 and an outer inner cavity 302 in the middle from bottom to top. The diameter of the outer inner cavity 302 is larger than the diameter of the small inner cavity 301. The piston block at the upper end of the small shaft 4 is slidably disposed in the small inner cavity 301. The small shaft 4 extends out from the lower end of the load-reducing shell 3. The piston block at the lower end of the large shaft 5 is slidably disposed in the outer inner cavity 302. The large shaft 5 extends out from the upper end of the load-reducing shell 3. Both the small shaft 4 and the large shaft 5 are tightly sealed with the load-reducing shell 3.

[0035] Specifically, the area of ​​the oil inside the load-reducing shell 3 acting on the piston block of the small shaft 4 is smaller than the area of ​​the oil acting on the piston block of the large shaft 5. Therefore, the load on the small shaft 4 is less than the load on the large shaft 5, and the stroke of the small shaft 4 is greater than the stroke of the large shaft 5, thus achieving a load-reducing effect.

[0036] The one-way valve 16 includes a fixed plate 1601, which is fixedly mounted on the inner wall of the circular hole of the plunger cover 8, the inner cylinder cover 10, and the outer cylinder cover 15. A sliding core 1602 is slidably mounted in the middle of the fixed plate 1601. A valve spring 1603 is sleeved on the outside of the sliding core 1602. The two ends of the valve spring 1603 are respectively connected to the sliding core 1602. A valve disc 1604 is provided at the upper end of the sliding core 1602. A sealing gasket 1605 is provided at the bottom of the valve disc 1604 to seal with the fixed plate 1601. A valve hole 1606 is provided in the fixed plate 1601.

[0037] Specifically, when the oil moves from the bottom to the top of the check valve 16, it acts on the sealing gasket 1605 and the valve disc 1604 through the valve hole 1606, causing the valve disc 1604 to rise, i.e., the sliding core 1602 to rise, and the valve spring 1603 to compress, exposing the valve hole 1606. The oil can then move from the bottom to the top through the valve hole 1606. When the oil moves from the top to the bottom of the check valve 16, it acts directly on the upper surface of the valve disc 1604, making the seal between the fixed plate 1601 and the valve disc 1604 tighter, thus preventing the oil from moving to the bottom of the check valve 16.

[0038] Each of the lower plunger 6 has a filter plate 17 at the liquid inlet 602 to filter out impurities in the well oil.

[0039] Considering that the filter plate 17 is blocked by impurities in the well, the oil can no longer enter the lower oil passage 601 from the inlet hole 602. The plunger cover 8 is provided with a support plate 18 around the circular hole, and a plug head 19 is provided on the top of the support plate 18. The bottom of the inner cylinder cover 10 is provided with a plug cylinder 20 for the plug head 19 to be inserted.

[0040] The upper surface of the valve disc 1604 of the one-way valve 16 on the plunger cover 8 is provided with a base 21, and a round rod 22 is provided on the top of the base 21. A slide seat 23 is provided on the upper surface of the plunger cover 8 and next to the base 21. A slide rod 24 is slidably provided on the slide seat 23. One end of the slide rod 24 is provided with a wedge 25 for driving the round rod 22, and the other end of the slide rod 24 is provided with an inclined block 26. A spring 27 is sleeved on the outside of the slide rod 24. The two ends of the spring 27 are respectively connected to the slide seat 23 and the inclined block 26. The lower surface of the inner cylinder cover 10 is provided with a pressure strip 28 for driving the inclined surface of the inclined block 26.

[0041] Specifically, during normal extension and retraction of the telescopic shaft of the submersible linear motor 2, the plug 19 will not be inserted into the plug cylinder 20, and the pressure strip 28 will not contact the inclined block 26. When it is necessary to remove impurities from the filter plate 17, the telescopic shaft of the submersible linear motor 2 extends to its limit position. During this process, the pressure strip 28 first contacts the inclined surface of the inclined block 26. The pressure strip 28 drives the inclined block 26 and the slide rod 24 to move along the slide seat 23 towards the round rod 22. The spring 27 is compressed, and the slide rod 24 moves synchronously with the wedge 25. The inclined surface of the wedge 25 contacts the round rod 22, causing the round rod 22 and the base 21 to rise. The base 21 raises the valve disc 1604 on the plunger cover 8, thereby exposing the valve hole 1606 of the one-way valve 16 on the plunger cover 8. As the lower plunger 6 continues to rise, the pressure bar 28 begins to contact the side of the inclined block 26. Therefore, the one-way valve 16 on the plunger cover 8 remains open, and the plug head 19 is inserted into the plug cylinder 20. The plug head 19 and the plug cylinder 20 are tightly sealed. Therefore, the oil inside the inner pump cylinder 9 and located between the plunger cover 8 and the inner cylinder upper cover 10 no longer flows out from the one-way valve 16 on the inner cylinder upper cover 10. Instead, it flows back from the one-way valve 16 on the plunger cover 8 into the upper oil passage 701, and then through the lower oil passage 601 to flush the filter plate 17 on the liquid inlet hole 602, flushing out the impurities in the filter plate 17.

[0042] Considering that impurities in the filter plate 17, after being washed down, still remain around the filter plate 17, which may clog the filter plate 17 again and affect production efficiency, a filter box 29 is provided on the lower surface of the outer cylinder lower cover 13. The filter box 29 has a round hole in the middle for the lower plunger 6 to pass through.

[0043] Specifically, before the oil flows back and forth across the filter plate 17, the filter plate 17 enters the filter box 29. Therefore, the impurities washed off the filter plate 17 are stored in the filter box 29. However, during the normal retraction process of the telescopic shaft of the submersible linear motor 2, the filter plate 17 does not enter the filter box 29. Therefore, the impurities stored in the filter box 29 will not re-enter the filter plate 17.

[0044] Considering that the impurities on the surface of the filter plate 17 are insufficient to be washed away by the returning hydraulic oil, two semi-circular slip rings 30 are symmetrically arranged inside the filter box 29 and at its circular hole. The lower part of the semi-circular slip ring 30 is provided with a chamfer 3001. The inner diameter of the semi-circular slip ring 30 is smaller than the inner diameter of the circular hole 29. Smooth rods 31 are slidably provided on both sides of the semi-circular slip ring 30, and the planes of the two semi-circular slip rings 30 are in contact with each other. Springs 32 are provided at both ends of the semi-circular slip ring 30. Springs 32 are sleeved on the smooth rods 31, and the ends of the springs 32 are connected to the smooth rods 31. A semi-circular cutter 33 is provided on the upper surface of the semi-circular slip ring 30.

[0045] Specifically, in the initial state, spring 2 32 provides elastic force, causing the two semi-circular cutters 33 to form a ring cutter, and the diameter of the ring cutter is equal to the outer diameter of the lower plunger 6. When the filter plate 17 enters the filter box 29 along with the lower plunger 6, the impurities on the surface of the filter plate 17 act on the chamfer 3001 below the semi-circular slip ring 30, causing the two semi-circular slip rings 30 to move outwards simultaneously. Therefore, the filter plate 17 with impurities passes smoothly through the semi-circular slip rings 30 and the semi-circular cutters 33. After the filter plate 17 passes the semi-circular cutter 33, spring 2 32 provides elastic force, causing the two semi-circular cutters 33 to close again. When the filter plate 17 descends with the lower plunger 6, the filter plate 17 passes through the ring cutter formed by the two semi-circular cutters 33, cutting off the stubborn impurities on the filter plate 17 and storing them inside the filter box 29.

[0046] Working principle: When using this device, place it into the oil well. During normal extension and retraction of the telescopic shaft of the submersible linear motor 2, the plug 19 will not insert into the plug cylinder 20, and the pressure strip 28 will not contact the inclined block 26. At the same time, the filter plate 17 will not enter the filter box 29. Spring 2 32 provides elastic force, causing the two semi-circular cutters 33 to form a ring cutter, and the diameter of the ring cutter is equal to the outer diameter of the lower plunger 6.

[0047] During a normal extension and retraction process, when the extension shaft of the submersible linear motor 2 extends, it transmits power through the load reduction component, causing the lower plunger 6 to move upward. The lower plunger 6, along with the upper plunger 7 and the plunger cover 8, rises synchronously. The oil inside the inner pump cylinder 9, located between the plunger cover 8 and the inner cylinder upper cover 10, is squeezed by the plunger cover 8 and flows from the one-way valve 16 on the inner cylinder upper cover 10 into the outer pump cylinder 14. A portion of the oil enters the inner pump cylinder 9 through the liquid passage hole 901, while another portion of the oil enters the oil delivery pipe 34 through the one-way valve 16 on the outer cylinder upper cover 15, thus completing the oil delivery. When the telescopic shaft of the submersible linear motor 2 retracts, the lower plunger 6 moves downward. The lower plunger 6, along with the upper plunger 7 and the plunger cover 8, descends synchronously. The oil in the inner pump barrel 9, located below the upper plunger 7, is squeezed by the lower surface of the upper plunger 7 and is transported back to the inner pump barrel 14 through the fluid passage 901. Since the oil cannot be transported from the top to the bottom of the inner cylinder cover 10, the oil enters the oil delivery pipe 34 again through the one-way valve 16 on the outer cylinder cover 15, continuously completing the oil delivery. At the same time, due to the synchronous descent of the upper plunger 7, the volume between the plunger cover 8 and the inner cylinder cover 10 increases, creating a negative pressure. This draws the oil in the well from the inlet 602 and then through the lower oil passage 601, the upper oil passage 701, and the one-way valve 16 on the plunger cover 8, entering the space between the plunger cover 8 and the inner cylinder cover 10. By repeatedly extending and retracting the submersible linear motor 2, oil can be continuously transported from the oil pipe 34 to the ground. When the lower plunger 6 rises, a portion of the oil acts on the lower surface of the upper plunger 7, thus reducing the load. Simultaneously, the effective area of ​​the lower plunger 6 acting on the oil is equal during its rise and fall, ensuring equal load on both phases. This results in a stable and unfluctuating oil flow rate from the oil pipe 34 and prevents the submersible linear motor 2 from malfunctioning due to frequent load changes.

[0048] When the oil passes through the inlet 602, the filter plate 17 filters out impurities from the oil in the well. When the filter plate 17 is blocked by impurities in the well, the telescopic shaft of the submersible linear motor 2 extends to its limit position. During this process, the impurities on the surface of the filter plate 17 act on the chamfer 3001 below the semi-circular slip ring 30, causing the two semi-circular slip rings 30 to move outwards simultaneously. Therefore, the filter plate 17 with impurities passes smoothly through the semi-circular slip rings 30 and the semi-circular cutter 33. After the filter plate 17 passes the semi-circular cutter 33, the spring 2 32 provides elastic force, causing the two semi-circular cutters 33 to close again, and the filter plate 17 enters the filter box 29.

[0049] As the telescopic shaft of the submersible linear motor 2 continues to move to its limit, the lower plunger 6 and the upper plunger 7 continue to rise. The pressure bar 28 contacts the inclined surface of the inclined block 26. The pressure bar 28 drives the inclined block 26 and the slide rod 24 to move along the slide seat 23 towards the round rod 22. The spring 27 is compressed, and the slide rod 24 moves synchronously with the wedge 25. The inclined surface of the wedge 25 contacts the round rod 22, causing the round rod 22 and the base 21 to rise. The base 21 raises the valve disc 1604 on the plunger cover 8, exposing the valve hole 1606 of the one-way valve 16 on the plunger cover 8, thus opening the one-way valve 16. As the lower plunger 6 continues to rise, the pressure bar 28 begins to contact the side of the inclined block 26. Therefore, the one-way valve 16 on the plunger cover 8 remains open, and the plug head 19 is inserted into the plug cylinder 20. The plug head 19 and the plug cylinder 20 are tightly sealed. Thus, the oil inside the inner pump cylinder 9, located between the plunger cover 8 and the inner cylinder upper cover 10, no longer flows out from the one-way valve 16 on the inner cylinder upper cover 10. Instead, it flows back from the one-way valve 16 on the plunger cover 8 into the upper oil passage 701, and then through the lower oil passage 601 to flush the filter plate 17 on the inlet hole 602, removing impurities from the filter plate 17. The impurities flushed from the filter plate 17 are stored in the filter box 29. The impurities stored in the filter box 29 will not re-enter the filter plate 17, preventing further blockage and impact on production efficiency.

[0050] As the filter plate 17 descends with the lower plunger 6, it passes through a ring cutter composed of two semi-circular cutters 33, which cuts off stubborn impurities from the filter plate 17. These stubborn impurities are also stored inside the filter box 29.

[0051] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. A submersible linear motor unloading device, characterized in that: The device includes a frame (1), a submersible linear motor (2) at the bottom of the frame (1), and a load reduction assembly in the middle of the frame (1). The load reduction assembly includes a load reduction shell (3), which is fixedly mounted on the middle of the frame (1). A small shaft (4) and a large shaft (5) are mounted on the load reduction shell (3). The small shaft (4) is connected to the telescopic shaft of the submersible linear motor (2). A lower plunger (6) is connected to the end of the large shaft (5). An upper plunger (7) is mounted on the top of the lower plunger (6). A lower oil passage (601) is located in the middle of the lower plunger (6), and a passage connecting the upper plunger (7) to the lower oil passage (601) is located in the middle of the upper plunger (7). The upper oil passage (701) is connected. The top of the upper oil passage (701) is provided with a plunger cover (8). The upper plunger (7) is slidably provided with an inner pump cylinder (9). The top of the inner pump cylinder (9) is provided with an inner cylinder upper cover (10). The lower end of the inner pump cylinder (9) is provided with an inner cylinder lower cover (11). The bottom of the inner cylinder lower cover (11) is provided with a sealing cylinder (12). The lower end of the sealing cylinder (12) is provided with an outer cylinder lower cover (13). The outer pump cylinder (14) is provided above the edge of the outer cylinder lower cover (13). The outer pump cylinder (14) is fixed on the frame (1). The top of the outer pump cylinder (14) is provided with an outer cylinder upper cover (15). The plunger cap (8), the inner cylinder cover (10) and the outer cylinder cover (15) are provided with a round hole in the middle part, and the round hole of the plunger cap (8), the inner cylinder cover (10) and the outer cylinder cover (15) are all provided with a one-way valve (16). The bottom of the side wall of the lower plunger (6) is uniformly provided with multiple inlet holes (602) for the lower oil passage (601), and the bottom of the inner pump cylinder (9) is provided with multiple through holes (901).

2. The submersible linear motor load reduction device according to claim 1, characterized in that: The square of the diameter of the upper plunger (7) is twice the square of the diameter of the lower plunger (6).

3. The submersible linear motor load reduction device according to claim 1, characterized in that: The load-reducing shell (3) has a small inner cavity (301) and an outer inner cavity (302) from bottom to top in the middle. The diameter of the outer inner cavity (302) is larger than the diameter of the small inner cavity (301). The piston block at the upper end of the small shaft (4) is slidably disposed in the small inner cavity (301). The small shaft (4) extends out from the lower end of the load-reducing shell (3). The piston block at the lower end of the large shaft (5) is slidably disposed in the outer inner cavity (302). The large shaft (5) extends out from the upper end of the load-reducing shell (3). Both the small shaft (4) and the large shaft (5) are tightly sealed with the load-reducing shell (3).

4. The submersible linear motor load reduction device according to claim 1, characterized in that: The one-way valve (16) includes a fixed plate (1601), which is fixedly mounted on the inner wall of the circular hole of the plunger cover (8), the inner cylinder cover (10) and the outer cylinder cover (15). A sliding core (1602) is slidably mounted in the middle of the fixed plate (1601). A valve spring (1603) is sleeved on the outside of the sliding core (1602). The two ends of the valve spring (1603) are connected to the sliding core (1602) and the sliding core (1602) respectively. A valve disc (1604) is provided at the upper end of the sliding core (1602). A sealing gasket (1605) is provided at the bottom of the valve disc (1604) to seal with the fixed plate (1601). A valve hole (1606) is provided in the fixed plate (1601).

5. The submersible linear motor unloading device according to claim 4, characterized in that: Each of the lower plungers (6) has a filter plate (17) at the liquid inlet (602).

6. The submersible linear motor load reduction device according to claim 5, characterized in that: The plunger cap (8) has a support plate (18) around the circular hole, a plug (19) on the top of the support plate (18), and a plug cylinder (20) for inserting the plug (19) at the bottom of the inner cylinder cover (10).

7. The submersible linear motor load reduction device according to claim 6, characterized in that: The upper surface of the valve disc (1604) of the one-way valve (16) on the plunger cover (8) is provided with a base (21), the top of the base (21) is provided with a round rod (22), the upper surface of the plunger cover (8) and the side of the base (21) is provided with a slide (23), a slide rod (24) is slidably provided on the slide (23), one end of the slide rod (24) is provided with a wedge (25) for driving the round rod (22), the other end of the slide rod (24) is provided with a slope block (26), a spring (27) is sleeved on the outside of the slide rod (24), the two ends of the spring (27) are respectively connected to the slide (23) and the slope block (26), and the lower surface of the inner cylinder cover (10) is provided with a pressure strip (28) for driving the slope of the slope block (26).

8. The submersible linear motor load reduction device according to claim 7, characterized in that: The lower surface of the outer cylinder cover (13) is provided with a filter box (29), and the middle part of the filter box (29) is provided with a round hole for the lower plunger (6) to pass through.

9. A submersible linear motor load reduction device according to claim 8, characterized in that: The filter box (29) is symmetrically provided with two semi-circular slip rings (30) inside and at its circular hole. The bottom of the semi-circular slip ring (30) is provided with a chamfer (3001). The inner diameter of the semi-circular slip ring (30) is smaller than the inner diameter of the circular hole. Both sides of the semi-circular slip ring (30) are provided with a smooth rod (31), and the planes of the two semi-circular slip rings (30) are in contact with each other. Both ends of the semi-circular slip ring (30) are provided with a second spring (32). The second spring (32) is sleeved on the smooth rod (31), and the end of the second spring (32) is connected to the smooth rod (31). The upper surface of the semi-circular slip ring (30) is provided with a semi-circular cutter (33).

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