Shale oil fluid transfer device

Abstract

The present application relates to shale oil oil liquid conveying technical field, especially shale oil oil liquid conveying device, including plunger pump box body, torsion shaft and gear, wherein, torsion shaft longitudinal setting and with plunger pump box body rotation seal connection, gear coaxial fixed setting on torsion shaft, and gear sets up inside plunger pump box body, the upper and lower sides of each gear are engaged with the transversely arranged rack, both ends of the rack are fixedly provided with a plunger, each plunger is correspondingly provided with a cylinder structure, the cylinder structure includes inner cylinder and outer cylinder, wherein, outer cylinder coaxially covers the outside of inner cylinder, to form annular chamber between inner cylinder and outer cylinder, one end of inner cylinder is fixedly installed on the side of plunger pump box body, and the plunger is slidingly sealed in the inner cylinder, one end of outer cylinder is sealingly and fixedly connected with the outer surface of inner cylinder through a sealing ring cover, the present application can reduce the installation space of the whole conveying device, reduce its installation difficulty, and the adaptability to external factors such as wellhead layout is better.

Description

Technical Field

[0001] This invention relates to the field of shale oil transportation technology, specifically to shale oil transportation devices. Background Technology

[0002] Shale oil transportation typically uses a plunger pump as the core pressurizing element. During the operation of the plunger pump, the plunger reciprocates inside the cylinder, thereby achieving the intake and discharge of oil.

[0003] Specifically, when the plunger moves outward, the volume of the cylinder cavity increases, the pressure decreases, creating a negative pressure environment. At this time, under the influence of external atmospheric pressure or other pressure sources, oil is drawn into the cylinder cavity through the inlet. When the plunger moves inward, the volume of the cylinder cavity decreases, the oil is compressed, and the pressure increases. Under the influence of the pressure difference, the oil is discharged from the cylinder through the outlet. By controlling the reciprocating frequency and stroke of the plunger, the intake and discharge volume of oil can be precisely adjusted to meet different delivery requirements.

[0004] However, current plunger pumps all adopt a single-layer cylinder structure design. Under the structural limitations of a single-layer cylinder, in order to ensure that the plunger has sufficient axial travel and meets the swing angle and torque requirements of the extraction equipment, designers usually need to place the oil port at the end of the single-layer cylinder. For a rack and pinion swing cylinder, one rack corresponds to two cylinders. Therefore, for a single-layer cylinder, the distance between the oil ports of the two cylinders is greater than the sum of the lengths of the two cylinders. This oil port arrangement has the drawback of excessively large oil port spacing, which means that the rack and pinion swing cylinder requires a large installation space. However, the installation space at the extraction site is often limited by the wellhead layout and other equipment components. Excessively large oil port spacing increases the difficulty of connecting the hydraulic pipeline to the oil port. Not only is it necessary to customize longer connecting pipelines to adapt to the oil port spacing, but the pipeline may also be bent or twisted due to insufficient pipeline layout space, affecting the smooth flow of hydraulic oil. At the same time, excessively large oil port spacing makes it difficult for the swing cylinder to adapt to the compact design of shale oil extraction equipment, and may even fail to meet the usage requirements of some shale oil extraction scenarios due to limited installation space. Summary of the Invention

[0005] The purpose of this invention is to provide a shale oil conveying device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] Shale oil fluid transportation device includes a plunger pump housing, a torsion shaft and two gears. The torsion shaft is arranged longitudinally and is rotatably and sealedly connected to the plunger pump housing. The gears are coaxially fixed on the torsion shaft and are located inside the plunger pump housing.

[0008] Each gear has a horizontally arranged rack meshing on both its upper and lower sides. Both ends of the rack are fixedly equipped with plungers, and each plunger is equipped with a corresponding cylinder structure.

[0009] The cylinder structure includes an inner cylinder and an outer cylinder. The outer cylinder is coaxially sleeved on the outside of the inner cylinder, forming an annular chamber between the inner and outer cylinders. One end of the inner cylinder is fixedly installed on the side of the plunger pump housing, and the plunger sliding seal is located inside the inner cylinder. One end of the outer cylinder is sealed and fixedly connected to the outer surface of the inner cylinder through a sealing ring cover. An end cover is fixedly installed on the other end of the outer cylinder. A gap is left between the other end of the inner cylinder and the end cover. An oil port is provided on the peripheral wall of the outer cylinder.

[0010] The cylinder structure also includes an annular support member, which includes an integrally formed bottom arc-shaped part and a top arc-shaped part, and a number of first slots are opened on the outer peripheral surface of the top arc-shaped part.

[0011] Both sides of the bottom of the annular chamber are equipped with buffer components. The buffer components extend along the axial direction of the inner cylinder, and their two ends abut against the support component and the sealing ring cover, respectively. The buffer components are used to divide the annular chamber into a top oil passage area and a bottom sedimentation area. The oil port is connected to the top oil passage area. A second slot is opened on the buffer component, and the top oil passage area and the bottom sedimentation area are connected through the second slot.

[0012] Preferably, the buffer includes two strip plates, the inner side of which is fixedly connected to the outer surface of the inner cylinder, and the second slot is opened on the outer side of the strip plate, with the second slots on the two strip plates being staggered.

[0013] Preferably, the strip is wavy, and the high and low ends of the two wavy strips are staggered, with the second slot opened at the low end of the wavy strip.

[0014] Preferably, a support frame is provided between several outer cylinders located on the same side of the plunger pump housing. The support frame includes a strip seat, a support strip, and a vertical rod. The support strip is provided between two adjacent outer cylinders, and the support strip is fixedly connected to the strip seat through the vertical rod.

[0015] Preferably, the support strip and the support member are arranged in the same vertical plane.

[0016] Preferably, the end cap is provided with a detection head for detecting the end face of the plunger; the detection head includes at least three pressure sensors and a positioning frame for mounting the pressure sensors, the positioning frame is sealed through the end cap, one end of which is located inside the inner cylinder and the other end is located outside the cylinder structure; when the plunger moves to its maximum stroke, the pressure sensor contacts the end face of the plunger.

[0017] Preferably, the positioning frame includes a mounting base, a connecting plate, and an extension rod. The pressure sensor is sealed and mounted on the mounting base. The mounting base is fixedly connected to the extension rod via the connecting plate. The extension rod is sealed and passes through the end cap.

[0018] Preferably, the end cap is provided with a stop member, which includes a liner and a sealing ring. One end of the stop member is coaxially fixedly connected to the end cap, and an oil inlet / outlet hole is opened at the top of one end of the stop member. The other end of the stop member extends into the interior of the inner cylinder. The pressure detection end of the pressure sensor protrudes from the other end face of the stop member. The sealing ring is sleeved on the outer circumference of the liner, so that the liner and the inner circumference of the inner cylinder are slidably sealed.

[0019] Preferably, an annular groove is provided on the outer periphery of the end face of the liner away from the end cap, and an oil baffle is fixedly provided on the liner.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The location of the oil port in this invention does not limit the plunger stroke. In this design, regardless of where the oil port is located on the outer cylinder, the plunger can slide along the inner cylinder to its maximum reach. Thus, the distance between the two oil ports symmetrically located on the two cylinder structures on both sides of the plunger pump housing can be adjusted by selecting an outer cylinder with different oil port locations and fitting it onto the inner cylinder. This reduces the installation space of the entire delivery device, lowers its installation difficulty, and improves its adaptability to external factors such as wellhead layout. Furthermore, the support structure can be used to support the inner and outer cylinders, improving their stability, and allows the oil to flow in the upper half of the annular chamber instead of the lower half. This prevents impurities that have settled at the bottom of the outer cylinder from mixing into the oil, providing a stable sedimentation environment for impurities.

[0022] This invention, through the design of a stop and a detection head, can detect the tilting of the plunger caused by factors such as wear or installation errors, allowing for timely intervention. The stop also effectively protects the pressure sensors. Furthermore, since the three pressure sensors should be as close as possible to the inner circumference of the inner cylinder, the liner is set to its maximum possible diameter. This facilitates the arrangement of the three pressure sensors, improving their detection accuracy of the plunger end face. Moreover, the maximum diameter of the liner, combined with the sealing ring, allows for a sliding seal connection with the inner circumference of the inner cylinder. This prevents oil from being disturbed and settling at the bottom of the outer cylinder as it passes through the gap between the inner and outer cylinders. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a cross-sectional three-dimensional structural diagram of the plunger pump housing and cylinder structure of the present invention;

[0025] Figure 3 This is a cross-sectional three-dimensional structural diagram of the cylinder block structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the stop and the detection head of the present invention;

[0027] Figure 5 This is a schematic diagram of the detection head of the present invention;

[0028] Figure 6 This is a side view of the inner cylinder, outer cylinder, support member, stop member, and detection head of the present invention.

[0029] Figure 7 This is a side view of the inner cylinder, outer cylinder, and buffer component of the present invention.

[0030] Figure 8 This is a schematic diagram of the structure of the inner cylinder and the buffer component of the present invention;

[0031] Figure 9 This is a front view of the buffer component of the present invention.

[0032] Figure 10 This is a schematic diagram of the support frame of the present invention.

[0033] In the diagram: 1. Plunger pump housing; 2. Torsion shaft; 3. Gear; 4. Rack; 5. Plunger; 6. Cylinder structure; 601. Inner cylinder; 602. Outer cylinder; 603. Annular chamber; 6031. Top oil passage area; 6032. Bottom sedimentation area; 604. End cap; 605. Oil port; 606. Support component; 6061. Bottom arc-shaped part; 6062. Top arc-shaped part; 6063. First groove; 607. Sealing ring 7. Cover; 8. Support frame; 9. Strip seat; 10. Support strip plate; 11. Vertical rod; 2. Stop; 3. Liner; 4. Oil inlet / outlet; 5. Annular groove; 6. Oil baffle plate; 7. Sealing ring; 8. Detection head; 9. Pressure sensor; 10. Mounting base; 11. Connecting plate; 12. Lead-out rod; 13. Buffer; 14. Strip plate; 15. Second groove. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1-10 The present invention provides a technical solution:

[0036] The shale oil conveying device includes a plunger pump housing 1, a torsion shaft 2, a gear 3, and a cylinder structure 6. The torsion shaft 2 is arranged longitudinally and is rotatably and sealed to the plunger pump housing 1. For example, the torsion shaft 2 and the plunger pump housing 1 are rotatably and sealed to each other through a mechanical seal. The gear 3 is coaxially and fixedly mounted on the torsion shaft 2 and is located inside the plunger pump housing 1. The torsion shaft 2 is driven to reciprocate by a drive device such as a motor, so that the gear 3 can reciprocate along with the torsion shaft 2.

[0037] The conveying device in this embodiment has two gears 3 and eight corresponding cylinder structures 6. As a result, the amount of oil flowing through the cylinder structure 6 in a single stroke is greatly increased, and the oil conveying capacity is large.

[0038] Each gear 3 has a horizontally arranged rack 4 meshing on both its upper and lower sides. Two gears 3 have four racks 4 meshing with each other. Both ends of the rack 4 are fixedly provided with plungers 5. Each plunger 5 is provided with a cylinder structure 6. Therefore, eight plungers 5 are provided with eight cylinder structures 6.

[0039] The following is a detailed description of the specific structure and working principle of the cylinder block structure 6 in this technical solution.

[0040] The cylinder structure 6 includes an inner cylinder 601 and an outer cylinder 602. The outer cylinder 602 is coaxially sleeved on the outside of the inner cylinder 601, forming an annular chamber 603 between the inner cylinder 601 and the outer cylinder 602. The inner circumferential surfaces of the inner cylinder 601 and the outer cylinder 602 are plated with hard chrome to enhance wear resistance.

[0041] One end of the inner cylinder 601 is fixedly installed on the side of the plunger pump housing 1, and the plunger 5 is slidably sealed inside the inner cylinder 601. One end of the outer cylinder 602 is sealed and fixedly connected to the outer surface of the inner cylinder 601 through a sealing ring cover 607. An end cover 604 is fixedly installed on the other end of the outer cylinder 602. A gap is left between the other end of the inner cylinder 601 and the end cover 604. An oil port 605 is provided on the peripheral wall of the outer cylinder 602. In actual use, the flow path of the oil is as follows: when the plunger 5 moves towards the end cover 604, and the oil in the inner cylinder 601 needs to be discharged, the oil in the inner cylinder 601 will enter the interior of the annular chamber 603 through the gap between the inner cylinder 601 and the end cover 604, and then be discharged through the oil port 605; when external oil needs to enter the interior of the inner cylinder 601, the oil first enters through the oil port 605. The plunger 5 enters the inner cylinder 601 through the gap between the inner cylinder 601 and the end cap 604 inside the annular chamber 603. The advantage of this arrangement is that the operator can adjust the position of the oil port 605 according to the actual situation. That is, the position of the oil port 605 will not become a limiting condition for the stroke of the plunger 5. For example, in this embodiment, no matter where the oil port 605 is located on the outer cylinder 602, the plunger 5 can slide along the inner cylinder 601 to its maximum stroke position. In this way, the distance between the two oil ports 605 symmetrically arranged on the two cylinder structures 6 on both sides of the plunger pump housing 1 is adjustable. For example, the outer cylinder 602 with different oil port 605 positions can be selected to be fitted on the inner cylinder 601, thereby reducing the installation space of the entire delivery device, reducing its installation difficulty, and improving its adaptability to external factors such as wellhead layout.

[0042] The oil delivery principle of the above scheme is as follows: Each oil port 605 is connected to a main pipe. Each main pipe is connected to two branch pipes through two one-way valves. One one-way valve on one branch pipe allows external oil to enter the interior of the annular chamber 603, and the one-way valve on the other branch pipe allows the oil inside the annular chamber 603 to enter the interior of the other branch pipe. Thus, when the rack 4 drives the plunger 5 away from its corresponding end cap 604, external oil will flow into the interior of the inner cylinder 601 through one of the branch pipes and oil port 605 until the oil volume in the inner cylinder 601 reaches its maximum. After that, when the rack 4 drives the plunger 5 to move towards its corresponding end cap 604, the oil in the inner cylinder 601 is squeezed into the interior of the annular chamber 603, and then enters the interior of the other branch pipe through oil port 605, completing the delivery of one cylinder of oil. This scheme has a total of eight cylinder structures 6. In a single reciprocating stroke of the torsion shaft 2, eight cylinders of oil will be delivered, resulting in a large delivery volume.

[0043] The cylinder structure 6 also includes an annular support member 606, which supports the inner cylinder 601 and the outer cylinder 602, improving the stability of the inner cylinder 601 and the outer cylinder 602. Furthermore, the support member 606 includes an integrally formed bottom arc-shaped portion 6061 and a top arc-shaped portion 6062. Several first slots 6063 are formed on the outer circumferential surface of the top arc-shaped portion 6062. The top arc-shaped portion 6062, in conjunction with the first slots 6063, facilitates the flow of oil through the first slots 6063, preventing the support member 606 from cutting off the annular chamber 603. The bottom arc-shaped portion 6061 facilitates sedimentation. Specifically, the double-layer cylinder design of the inner cylinder 601 and the outer cylinder 602 in this technical solution, on the one hand, can ensure... While ensuring the plunger 5 stroke remains unchanged, the distance between the oil ports 605 is reduced. On the other hand, this also provides a basis for the sedimentation of impurities inside the oil, preventing particulate matter and other impurities from continuously circulating with the oil, reducing the probability of wear and damage to the entire device. Then, in conjunction with the structural design of the support 606, the oil can flow in the upper half of the annular chamber 603 instead of the lower half. In this way, the flow of the oil will not cause impurities that have settled at the bottom of the outer cylinder 602 to mix into the oil, providing a stable sedimentation environment for the sedimentation of impurities.

[0044] To further provide a better sedimentation environment for impurities, the following structure is also provided in this embodiment: buffer members 10 are provided on both sides of the bottom of the annular chamber 603. The buffer members 10 can be made of stainless steel. The buffer members 10 extend along the axial direction of the inner cylinder 601, and their two ends abut against the support member 606 and the sealing ring cover 607 respectively. The buffer members 10 are used to divide the annular chamber 603 into a top oil passage area 6031 and a bottom sedimentation area 6032. The oil port 605 is connected to the top oil passage area 6031. The flow of oil is basically completed inside the top oil passage area 6031. The flow of oil inside the top oil passage area 6031 will not disturb the oil and sediment in the bottom sedimentation area 6032. A second slot 1002 is provided on the buffer member 10. The top oil passage area 6031 and the bottom sedimentation area 6032 are connected through the second slot 1002.

[0045] Furthermore, the buffer 10 includes two strip plates 1001. The inner side of the strip plate 1001 is fixedly connected to the outer surface of the inner cylinder 601, for example, by welding. The second slot 1002 is opened on the outer side of the strip plate 1001. The second slots 1002 on the two strip plates 1001 are staggered to each other, which can reduce the disturbance of the oil and sediment in the bottom sedimentation area 6032 when the oil flows in the top oil passage area 6031. Furthermore, the strip plate 1001 is wavy, with the high and low ends of the two wavy strip plates 1001 staggered. The second slot 1002 is located at the low end of the wavy strip plate 1001. Thus, the sedimentation path of the precipitate is as follows: it first settles on the outer strip plate 1001, and then flows along the slope of the outer strip plate 1001 to the second slot 1002 of the outer strip plate 1001 due to gravity and other factors. After that, the precipitate rolls through the second slot 1002 of the outer strip plate 1001 and falls to the inner strip plate 1001. Similarly, it flows along the slope of the inner strip plate 1001 to the second slot 1002 of the inner strip plate 1001, and finally enters the bottom sedimentation area 6032. In this way, the precipitate can more stably settle into the interior of the bottom sedimentation area 6032 through the second slot 1002.

[0046] A support frame 7 is provided between several outer cylinders 602 located on the same side of the plunger pump housing 1. The support frame 7 includes a strip seat 701, a support strip 702, and a vertical rod 703. The support strip 702 is provided between two adjacent outer cylinders 602. The support strip 702 is fixedly connected to the strip seat 701 through the vertical rod 703. The support strip 702 and the support member 606 are provided on the same vertical plane, so that the support strip 702 can be used to directly support the support member 606.

[0047] The end cap 604 is provided with a detection head 9 for detecting the end face of the plunger 5. The detection head 9 is used to detect the tilt of the plunger 5 caused by factors such as wear or installation errors, so as to deal with it in time. Specifically, the detection head 9 includes at least three pressure sensors 901 and a positioning frame for mounting the pressure sensors 901. The detection surface formed by the three pressure sensors 901 is perpendicular to the axis of the inner cylinder 601. The positioning frame seal penetrates the end cap 604, with one end located inside the inner cylinder 601 and the other end located outside the cylinder structure 6. When the plunger 5 moves to its maximum stroke, the pressure sensors 901 contact the end face of the plunger 5. At this time, the three pressure sensors 901 will detect different positions of the end face of the plunger 5. When the pressure signals detected by the three pressure sensors 901 are inconsistent, it indicates that the end face of the plunger 5 is not perpendicular to the axis of the inner cylinder 601, and the plunger 5 needs to be adjusted or replaced. In this embodiment, the warning method for when the pressure signals detected by the three pressure sensors 901 are inconsistent is not limited. For example, the three pressure sensors 901 are electrically connected to the control module, and warning devices such as warning lights are electrically connected to the control module. When the pressure signals detected by the three pressure sensors 901 are inconsistent, the control module can activate the warning light to issue a warning. The above warning methods are existing technologies, so they will not be described in detail.

[0048] Furthermore, the three pressure sensors 901 mentioned above should be evenly distributed along the circumference of the inner cylinder 601 and should be as close as possible to the inner circumferential surface of the inner cylinder 601. This can improve the detection accuracy of the three pressure sensors 901. The reason is that when the plunger 5 is tilted, the greater the distance between the two detection points along the radial direction of the plunger 5, the greater the distance between the two detection points in the axial direction of the inner cylinder 601, and the greater the difference in pressure values ​​detected by the pressure sensors 901 located at the two detection points.

[0049] In this technical solution, the rack 4 has sufficient length, which allows the end cover 604 to be removed first when the plunger 5 needs to be adjusted or replaced. Then, the plunger 5 can be pushed directly out of the inner cylinder 601 by moving the rack 4, which facilitates the operation of the plunger 5, reduces the difficulty of replacing the plunger 5, and allows for direct on-site replacement.

[0050] Furthermore, the positioning frame includes a mounting base 902, a connecting plate 903, and an extension rod 904. The pressure sensor 901 is sealed and mounted on the mounting base 902. The mounting base 902 is fixedly connected to the extension rod 904 through the connecting plate 903. The extension rod 904 sealably penetrates the end cover 604. For example, the extension rod 904 can be sealed to the end cover 604 by welding. The extension rod 904 can be set as a hollow structure to facilitate the lead-out of the pressure sensor 901 wire.

[0051] A stopper 8 is provided on the end cap 604. The stopper 8 is used to protect the pressure sensor 901 and prevent it from being damaged by excessive compression by the plunger 5. The stopper 8 includes a liner 801 and a sealing ring 803. One end of the stopper 8 is coaxially and fixedly connected to the end cap 604, for example, by welding. An oil inlet / outlet hole 8011 is opened at the top of one end of the stopper 8. The oil inlet / outlet hole 8011 is used to connect the inner cylinder 601 and the outer cylinder 602. The other end of the stopper 8 extends into the interior of the inner cylinder 601. The pressure detection end of the pressure sensor 901 protrudes from the other end face of the stopper 8. In this embodiment, the pressure detection end of the pressure sensor 901 protrudes slightly from the other end face of the stopper 8. For example, the protrusion distance can be 1 mm. The sealing ring 803 is sleeved on the outer circumference of the liner 801, so that the liner 801 is slidably and sealingly connected to the inner circumferential surface of the inner cylinder 601.

[0052] In this embodiment, on the one hand, since the three pressure sensors 901 should be as close as possible to the inner circumferential surface of the inner cylinder 601, setting the liner 801 to its maximum possible diameter can improve the detection accuracy of the three pressure sensors 901 on the end face of the plunger 5. On the other hand, the maximum diameter of the liner 801, in conjunction with the sealing ring 803, can achieve a sliding seal connection with the inner circumferential surface of the inner cylinder 601. In this way, it can prevent the oil from disturbing the sediment at the bottom of the outer cylinder 602 as it passes through the gap between the inner cylinder 601 and the outer cylinder 602. At the same time, the liner 801 also has the function of protecting the pressure sensors 901.

[0053] An annular groove 8012 is provided on the outer periphery of the end face of the liner 801 away from the end cap 604. The annular groove 8012 is used to accommodate possible impurities, and an oil baffle 802 is fixedly provided on the liner 801 to change the direction of oil flow.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A shale oil fluid conveying device, characterized in that, It includes a plunger pump housing, a torsion shaft, and two gears. The torsion shaft is arranged longitudinally and is rotatably and sealedly connected to the plunger pump housing. The gears are coaxially and fixedly mounted on the torsion shaft and are located inside the plunger pump housing. Each gear has a horizontally arranged rack meshing on both its upper and lower sides. Both ends of the rack are fixedly equipped with plungers, and each plunger is equipped with a corresponding cylinder structure. The cylinder structure includes an inner cylinder and an outer cylinder. The outer cylinder is coaxially sleeved on the outside of the inner cylinder, forming an annular chamber between the inner and outer cylinders. One end of the inner cylinder is fixedly installed on the side of the plunger pump housing, and the plunger sliding seal is located inside the inner cylinder. One end of the outer cylinder is sealed and fixedly connected to the outer surface of the inner cylinder through a sealing ring cover. An end cover is fixedly installed on the other end of the outer cylinder. A gap is left between the other end of the inner cylinder and the end cover. An oil port is provided on the peripheral wall of the outer cylinder. The cylinder structure also includes an annular support member, which includes an integrally formed bottom arc-shaped part and a top arc-shaped part, and a number of first slots are opened on the outer peripheral surface of the top arc-shaped part. Both sides of the bottom of the annular chamber are provided with buffer components. The buffer components extend along the axial direction of the inner cylinder, and their two ends abut against the support component and the sealing ring cover respectively. The buffer components are used to divide the annular chamber into a top oil passage area and a bottom sedimentation area. The oil port is connected to the top oil passage area. A second slot is provided on the buffer component, and the top oil passage area and the bottom sedimentation area are connected through the second slot. The buffer includes two strip plates. The inner side of the strip plates is fixedly connected to the outer surface of the inner cylinder. The second slot is opened on the outer side of the strip plates, and the second slots on the two strip plates are staggered. The strip is wavy, and the high and low ends of the two wavy strips are staggered. The second slot is opened at the low end of the wavy strip. The end cap is provided with a detection head for detecting the end face of the plunger; the detection head includes at least three pressure sensors and a positioning frame for mounting the pressure sensors. The positioning frame is sealed through the end cap, with one end located inside the inner cylinder and the other end located outside the cylinder structure; when the plunger moves to its maximum stroke, the pressure sensor contacts the end face of the plunger. The positioning frame includes a mounting base, a connecting plate, and an extension rod. The pressure sensor is sealed and mounted on the mounting base. The mounting base is fixedly connected to the extension rod through the connecting plate. The extension rod is sealed and penetrates the end cap. The end cap is provided with a stop, which includes a liner and a sealing ring. One end of the stop is coaxially fixedly connected to the end cap, and an oil inlet / outlet hole is opened at the top of one end of the stop. The other end of the stop extends into the interior of the inner cylinder. The pressure detection end of the pressure sensor protrudes from the other end face of the stop. The sealing ring is sleeved on the outer circumference of the liner, so that the liner and the inner circumference of the inner cylinder are slidably sealed.

2. The shale oil conveying device according to claim 1, characterized in that, A support frame is provided between several outer cylinders located on the same side of the plunger pump housing. The support frame includes a strip seat, a support strip, and a vertical rod. The support strip is set between two adjacent outer cylinders, and the support strip is fixedly connected to the strip seat through the vertical rod.

3. The shale oil conveying device according to claim 2, characterized in that, The support strips and support components are set on the same vertical plane.

4. The shale oil conveying device according to claim 1, characterized in that, An annular groove is provided on the outer periphery of the end face of the liner away from the end cap, and an oil baffle is fixedly installed on the liner.

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