Self-cleaning oil filtration device and composite oil extraction coupling

Abstract

A self-cleaning oil filtration device and a composite oil extraction coupling, relating to the field of oil filtration. The self-cleaning oil filtration device comprises: a housing (1), wherein the housing (1) is provided with a crude oil inlet (2) in one end and an oil outlet (4) in the other end, the crude oil inlet (2) is communicated with an oil outlet of an oil pump by means of a pipe, a beam pumping unit drives the oil pump by means of a composite oil extraction coupling, and the oil outlet (4) is communicated with a storage tank; and an oil filtration mechanism (7), wherein the oil filtration mechanism (7) is mounted in the housing (1) and is used for filtering crude oil, a residue discharge port (8) is formed through the housing (1) at a position corresponding to the oil filtration mechanism (7), a filter residue collection chamber (5) is sealingly snap-fitted to the residue discharge port (8), and scrapers (9) are further arranged in the residue discharge port (8). By means of the filtration device, when a cleaning condition is met, the oil filtration mechanism (7) can automatically clean itself, thereby improving the overall efficiency of filtration; moreover, the composite oil extraction coupling can effectively prevent itself from detaching or twisting off, and also improve the corrosion resistance thereof.

Description

A self-cleaning oil filtration device and a composite oil extraction connector Technical Field

[0001] This invention relates to the field of petroleum filtration, specifically to a self-cleaning petroleum filtration device and a composite oil extraction connector. Background Technology

[0002] Oil, a core target in geological exploration, is a viscous, dark brown liquid, often referred to as the "lifeline of industry." It is primarily found in the shallow layers of the Earth's crust, possessing a complex composition composed of numerous alkanes, cycloalkanes, and aromatic hydrocarbons. Petroleum is not only a major source of fuels such as gasoline and diesel, but also plays a crucial role as a raw material for many products in the chemical industry, encompassing solvents, fertilizers, pesticides, and plastics. However, crude oil extracted from the ground often contains impurities and foreign matter, requiring filtration to remove these impurities and obtain pure petroleum products. Existing oil filtration and extraction equipment presents the following problems:

[0003] 1. Real-time oil filtration equipment cannot be automatically cleaned. It usually requires manual removal and active cleaning of the filter screen after the first stage of filtration. Manual cleaning is not only cumbersome, but also reduces the overall filtration efficiency.

[0004] 2. The filtration status and cleaning time of the filter screen cannot be accurately controlled. Frequent cleaning can cause excessive wear on the filter screen, while untimely cleaning can lead to poor oil filtration efficiency.

[0005] 3. During operation, the sucker rod joint is prone to detachment, sucker rod may break, and corrosion is a common problem.

[0006] To address the above problems, this invention provides a self-cleaning oil filtration device and a composite oil extraction connector to solve these issues. Technical issues

[0007] Crude oil extracted from underground often contains impurities and foreign matter, requiring filtration to remove these impurities in order to obtain pure petroleum products. Existing oil filtration and extraction equipment suffers from the following problems:

[0008] 1. Real-time oil filtration equipment cannot be automatically cleaned. It usually requires manual removal and active cleaning of the filter screen after the first stage of filtration. Manual cleaning is not only cumbersome, but also reduces the overall filtration efficiency.

[0009] 2. The filtration status and cleaning time of the filter screen cannot be accurately controlled. Frequent cleaning can cause excessive wear on the filter screen, while untimely cleaning can lead to poor oil filtration efficiency.

[0010] 3. During operation, the sucker rod joint is prone to detachment, sucker rod may break, and corrosion is a common problem.

[0011] To address the above problems, this invention provides a self-cleaning oil filtration device and a composite oil extraction connector to solve these issues. Technical solutions

[0012] To achieve the above objectives, the present invention provides the following technical solution: a self-cleaning oil filtration device, comprising: a shell, one end of which is provided with a crude oil inlet and the other end with a crude oil outlet, the crude oil inlet being connected to the outlet of an oil pump through a pipeline, a beam-type oil pumping unit driving the oil pump through a composite oil pumping joint, and the crude oil outlet being connected to a storage tank.

[0013] The oil filtration mechanism is installed inside the housing and is used to filter crude oil. A slag discharge port is provided through the housing corresponding to the oil filtration mechanism, and a slag collection bin is snapped and sealed on the slag discharge port. A scraper is also provided inside the slag discharge port.

[0014] Further, preferably, the oil filtration mechanism includes: an oil guide valve port, which is fixed at one end of the housing near the crude oil inlet; an adjusting ring is provided by sliding seal between the oil guide valve port and the housing; and an adjusting spring is provided between the adjusting ring and the oil guide valve port.

[0015] Two control components are symmetrically arranged inside the housing, with one end connected to the adjusting ring and the other end connected to one end of the oil filter assembly, which is installed inside the housing.

[0016] The mounting bracket is fixed inside the housing and connected to the other end of the oil filter assembly.

[0017] Further, preferably, the oil filter assembly includes a ring frame, which is slidably disposed within the housing. A bearing is fixedly disposed at the axis of the ring frame, a nut is coaxially disposed through the bearing, and a scraper is fixedly disposed on the nut.

[0018] The lead screw is fixedly mounted on the fixed frame and is also threadedly connected to the nut.

[0019] Two locking hooks are symmetrically fixed on the ring frame and engage with the control components.

[0020] Furthermore, preferably, the oil filtration assembly also includes: a filter residue storage box, a filter screen, a sealing ring, and a compression spring;

[0021] The filter residue storage box is fixedly mounted on the ring frame; the filter screen is fixedly mounted on the ring frame; the sealing ring is fixedly mounted on the housing to cooperate with the ring frame to achieve a seal;

[0022] A compression spring is sleeved on the lead screw, with one end connected to the fixed frame and the other end connected to the ring frame.

[0023] Furthermore, preferably, the control component includes a fixing ring, which is fixedly mounted on the housing, and a rotating seat is fixedly mounted on the fixing ring corresponding to the locking hook;

[0024] The adjusting rod is rotatably mounted on the rotating base. One end is engaged with the locking hook, and the other end is rotatably mounted on one end of the telescopic adjuster. The other end of the telescopic adjuster is rotatably mounted on the adjusting ring.

[0025] Furthermore, preferably, the filter residue storage box includes a filter residue box, which is fixedly mounted on the ring frame, and a bottom plate is rotatably mounted at the bottom of the filter residue box at the end away from the ring frame.

[0026] A composite oil extraction connector, characterized in that it includes a sucker rod, a sleeve, an inner sleeve, a connector, and an oil self-cleaning filter device;

[0027] One end of the connector is connected to the oil pump of the self-cleaning oil filter device, and the other end is detached from the sleeve through an internal thread. The surface of the connector is treated with multi-alloy co-infiltration technology.

[0028] The inner sleeve is fixed inside the socket joint. The outer wall of the inner sleeve has a conical structure and three arc platforms are opened inside. The arc platforms are used to hold the sucker rod. A torque unloader, coupling, and centralizer treated with multi-alloy co-infiltration technology are installed on the sucker rod. The coupling is used to connect and separate sucker rods of different numbers and specifications.

[0029] The torque unloader is used to absorb, disperse, and reduce the torque and stress generated by the reciprocating motion of the driving equipment; the stabilizer is used to stabilize the sucker rod and prevent uneven wear.

[0030] Furthermore, preferably, the sucker rod is made of fiber-reinforced composite material; after the inner sleeve is machined as a whole, it is divided into two halves at the axial center position with a certain gap. Beneficial effects

[0031] Compared with the prior art, the present invention provides a self-cleaning oil filtration device and a composite oil extraction connector, which have the following beneficial effects:

[0032] 1. During crude oil filtration, the amount of impurities adhering to the filter gradually increases, leading to a gradual decrease in filtration efficiency. When the filtration efficiency decreases and becomes less than the extraction efficiency of the oil pump, the filter gradually increases its oil storage space to maintain the pump's extraction efficiency. When the filter reaches its maximum storage space, it automatically cleans the adhering impurities. The cleaned impurities are scraped off by a scraper as they pass through the discharge port and fall into the filter residue collection bin for storage. This self-cleaning process improves the overall efficiency of crude oil filtration.

[0033] 2. When the oil filtration mechanism reaches the cleaning conditions, it automatically cleans the filter screen to avoid excessive cleaning that could cause wear on the filter screen, as well as reduced filtration efficiency due to untimely cleaning.

[0034] 3. The outer wall of the inner sleeve has the same taper as the inner wall of the sleeve joint and has a high surface finish. At the same time, the arc platform set in the inner sleeve holds the sucker rod tightly. That is, when the sucker rod is subjected to axial tension, the inner sleeve will move towards the lower end of the sleeve joint simultaneously, thereby converting the axial tension into radial locking force. This locking force will further improve the mechanical locking effect of the arc platform on the sucker rod, and the stronger the axial tension, the better the mechanical locking effect. Attached Figure Description

[0035] Figure 1 is a schematic diagram of an overall petroleum self-cleaning filtration device;

[0036] Figure 2 is an enlarged schematic diagram of the structure at point A of a self-cleaning oil filtration device;

[0037] Figure 3 is a schematic diagram of the connection of the oil filter assembly of a self-cleaning oil filtration device.

[0038] Figure 4 is an enlarged schematic diagram of the structure at point B of a self-cleaning oil filtration device.

[0039] Figure 5 is an enlarged schematic diagram of the structure at point C of a self-cleaning oil filtration device.

[0040] Figure 6 is an enlarged schematic diagram of the structure at point D of a self-cleaning oil filtration device.

[0041] Figure 7 is a schematic diagram of the slag discharge port of a self-cleaning oil filter device.

[0042] Figure 8 is a schematic diagram of the internal structure of the composite oil extraction joint;

[0043] Figure 9 is a schematic diagram of the inner sleeve structure of the composite oil pumping joint;

[0044] Figure 10 is a top view of the inner sleeve of the composite oil sucker joint;

[0045] Figure 11 is a schematic diagram of the structure of the composite oil extraction joint connector;

[0046] Figure 12 is a top view of the composite oil extraction joint connector;

[0047] In the diagram: 1. Shell; 2. Crude oil inlet; 4. Oil outlet; 5. Filter residue collection bin; 61. Sucker rod; 62. Socket joint; 63. Inner sleeve; 64. Connector; 7. Oil filtration mechanism; 71. Oil guide valve port; 72. Adjusting ring; 73. Adjusting spring; 74. Control assembly; 741. Fixed ring; 742. Rotary seat; 743. Adjusting rod; 745. Telescopic adjuster; 75. Oil filtration assembly; 751. Ring frame; 752. Lead screw; 753. Locking hook; 754. Nut; 755. Filter residue temporary storage box; 7551. Filter residue box; 7552. Base plate; 756. Bearing; 757. Filter screen; 758. Scraper; 759. Sealing ring; 7510. Compression spring; 76. Fixed frame; 8. Slag discharge port; 9. Scraper. The best embodiment of the present invention

[0048] Start the beam pumping unit. The beam pumping unit drives the oil pump to extract crude oil from the rock formation through the composite oil pumping joint. The crude oil extracted by the oil pump flows into the shell 1 through the crude oil inlet 2 via the pipeline. At this time, the crude oil is filtered to remove impurities by the oil filtration mechanism 7. After filtration, the crude oil flows to the storage tank through the oil outlet 4 for storage.

[0049] During the crude oil filtration process of the oil filtration mechanism 7, the amount of impurities adhering to the oil filtration mechanism 7 will gradually increase, resulting in a gradual decrease in filtration efficiency. At this time, when the filtration efficiency gradually decreases and is less than the extraction efficiency of the oil pump, the oil filtration mechanism 7 will gradually increase the oil storage space. When the maximum oil storage space of the oil filtration mechanism 7 is reached, the oil filtration mechanism 7 will automatically clean the impurities adhering to it. The cleaned impurities will be scraped off by the scraper 9 when passing through the slag discharge port 8 and fall into the filter slag collection bin 5 for storage.

[0050] After the oil filtration unit 7 completes its self-cleaning process, it returns to its initial filtration state. Repeating this process continuously filters impurities from the crude oil extracted by the oil pump, ensuring real-time filtration of the extracted crude oil. This reduces the impurity content in the crude oil while improving the efficiency of crude oil extraction and subsequent processing. Embodiments of the present invention

[0051] Referring to Figures 1-12, the present invention provides a technical solution: a self-cleaning oil filtration device, comprising: a shell 1, a crude oil inlet 2 at one end of the shell 1 and a crude oil outlet 4 at the other end, the crude oil inlet 2 being connected to the oil outlet of an oil pump through a pipeline, a beam-type oil pumping unit driving the oil pump through a composite oil pumping joint, and the oil outlet 4 being connected to a storage tank.

[0052] The oil filtration mechanism 7 is installed inside the housing 1 and is used to filter crude oil. A slag discharge port 8 is provided through the housing 1 corresponding to the oil filtration mechanism 7. A slag collection bin 5 is snapped and sealed on the slag discharge port 8. A scraper 9 is also provided inside the slag discharge port 8.

[0053] Start the beam pumping unit. The beam pumping unit drives the oil pump to extract crude oil from the rock formation through the composite oil pumping joint. The crude oil extracted by the oil pump flows into the shell 1 through the crude oil inlet 2 via the pipeline. At this time, the crude oil is filtered to remove impurities by the oil filtration mechanism 7. After filtration, the crude oil flows to the storage tank through the oil outlet 4 for storage.

[0054] During the crude oil filtration process of the oil filtration mechanism 7, the amount of impurities adhering to the oil filtration mechanism 7 will gradually increase, resulting in a gradual decrease in filtration efficiency. At this time, when the filtration efficiency gradually decreases and is less than the extraction efficiency of the oil pump, the oil filtration mechanism 7 will gradually increase the oil storage space. When the maximum oil storage space of the oil filtration mechanism 7 is reached, the oil filtration mechanism 7 will automatically clean the impurities adhering to it. The cleaned impurities will be scraped off by the scraper 9 when passing through the slag discharge port 8 and fall into the filter slag collection bin 5 for storage.

[0055] After the oil filtration unit 7 completes self-cleaning, it returns to the initial filtration state. Repeating the above process can continuously filter impurities in the crude oil extracted by the oil pump, ensuring real-time filtration of the extracted crude oil. This reduces the impurity content in the crude oil while improving the efficiency of crude oil extraction and subsequent processing.

[0056] In a preferred embodiment, the oil filtration mechanism 7 includes: an oil guide valve port 71, which is fixed to one end of the housing 1 near the crude oil inlet 2; an adjusting ring 72 is provided by sliding seal between the oil guide valve port 71 and the housing 1; and an adjusting spring 73 is provided between the adjusting ring 72 and the oil guide valve port 71.

[0057] Two control components 74 are symmetrically arranged inside the housing 1, with one end connected to the adjusting ring 72 and the other end connected to one end of the oil filter assembly 75, which is installed inside the housing 1.

[0058] The mounting bracket 76 is fixed inside the housing 1 and connected to the other end of the oil filter assembly 75.

[0059] It should be explained that the crude oil entering the housing 1 flows to the oil filter assembly 75 through the oil guide valve port 71, and the oil filter assembly 75 filters out impurities in the crude oil.

[0060] As impurities accumulate on the oil filter assembly 75, causing its filtration efficiency to fall below that of the oil pump, the continuous influx of crude oil causes the regulating ring 72 to slide closer to the crude oil inlet 2, thereby increasing the oil storage space. While the regulating ring 72 slides, it compresses the regulating spring 73, simultaneously adjusting the state of the control assembly 74. As the oil storage space increases and approaches its limit, the continued influx of crude oil causes the regulating ring 72 to continue sliding, thus changing the connection between the control assembly 74 and the oil filter assembly 75. When the oil storage space reaches its limit (the regulating ring 72 slides to its limit), the connection between the control assembly 74 and the oil filter assembly 75 is released. Under the action of the regulating spring 73, the regulating ring 72 pushes crude oil onto the oil filter assembly 75, allowing the oil filter assembly 75 to self-clean the impurities adhering to it. After self-cleaning, the oil filter assembly 75 returns to its initial state and reconnects to the control assembly 74.

[0061] In a preferred embodiment, the oil filter assembly 75 includes a ring frame 751, which is slidably disposed within the housing 1. A bearing 756 is fixedly disposed at the axis of the ring frame 751, and a nut 754 is coaxially disposed through the bearing 756. A scraper 758 is fixedly disposed on the nut 754. A limiting platform is also disposed on the ring frame 751, which abuts against the housing 1 to limit the rotation of the ring frame 751.

[0062] The lead screw 752 is fixedly mounted on the fixed bracket 76, and the lead screw 752 is also threadedly connected to the nut 754.

[0063] Two locking hooks 753 are symmetrically fixed on the ring frame 751 and engage with the control component 74.

[0064] In a preferred embodiment, the oil filter assembly 75 further includes: a filter residue storage box 755, a filter screen 757, a sealing collar 759, and a compression spring 7510;

[0065] The filter residue storage box 755 is fixedly mounted on the ring frame 751; the filter screen 757 is fixedly mounted on the ring frame 751; the sealing ring 759 is fixedly mounted on the housing 1 and is used to cooperate with the ring frame 751 to achieve a seal.

[0066] The compression spring 7510 is sleeved on the lead screw 752, with one end connected to the fixed frame 76 and the other end connected to the ring frame 751.

[0067] It should be noted that filter screen 757 filters impurities in crude oil. Under the action of crude oil, impurities adhere to filter screen 757, which causes the impurities to gradually clog the mesh during the filtration process, resulting in a gradual decrease in the filtration efficiency of filter screen 757.

[0068] When the efficiency of the filter screen 757 in filtering crude oil is lower than the efficiency of the oil pump in delivering crude oil, the unfiltered portion of crude oil will act on the adjusting ring 72, causing it to slide to increase the oil storage space. Simultaneously, the movement of the adjusting ring 72 will gradually compress the adjusting spring 73 and change the state of the control component 74. As the adjusting ring 72 gradually slides to its limit position (the oil storage space gradually reaches its limit), its continued movement will cause the control component 74 to gradually deflect. When the adjusting ring 72 reaches its limit sliding position, the deflection of the control component 74 will disengage it from the locking hook 753, allowing the ring frame 751 and the filter screen 757 to slide within the housing 1 under the action of the adjusting spring 73.

[0069] When the ring frame 751 slides, the nut 754 starts to rotate under the action of the lead screw 752. The rotation of the nut 754 causes the scraper 758 to rotate and scrape off the impurities adhering to the surface of the filter screen 757. At the same time, the sliding distance of the ring frame 751 is just enough to make the scraper 758 rotate a full number of revolutions on the filter screen 757. That is, after the scraping is completed, the scraper 758 will stay in the initial position.

[0070] After the scraper plate 758 finishes cleaning the impurities adhering to the surface of the filter screen 757, the impurities will accumulate on top of the filter residue storage box 755. Under the action of gravity, the larger amount of impurities will gradually flow into the filter residue storage box 755 for collection.

[0071] When cleaning impurities from the filter screen 757, the sliding of the ring frame 751 will squeeze the compression spring 7510. After the scraper plate 758 completes the removal of impurities from the filter screen 757, the elastic force generated by the compression spring 7510 can restore the ring frame 751 to its initial state, and at the same time establish a connection between the locking hook 753 and the control component 74.

[0072] In a preferred embodiment, the control component 74 includes a fixing ring 741, which is fixedly disposed on the housing 1, and a rotating seat 742 is fixedly disposed on the fixing ring 741 corresponding to the locking hook 753.

[0073] The adjusting rod 743 is rotatably mounted on the rotating seat 742. One end is engaged with the locking hook 753, and the other end is rotatably mounted on one end of the telescopic adjuster 745. The other end of the telescopic adjuster 745 is rotatably mounted on the adjusting ring 72.

[0074] It should be noted that during the movement of the adjusting ring 72, the length of the telescopic adjuster 745 will change adaptively. When the telescopic adjuster 745 reaches its limit and its length cannot be changed, the continued movement of the adjusting ring 72 will cause the telescopic adjuster 745 to pull the adjusting rod 743 and make it rotate. When the adjusting ring 72 moves to its limit position, the rotation angle of the adjusting rod 743 will disengage it from the locking hook 753, that is, release the position restriction on the ring frame 751. Thus, the ring frame 751 is moved by the adjusting ring 72 and crude oil under the action of the adjusting spring 73, so as to complete the self-cleaning effect of the filter screen 757.

[0075] After the filter 757 completes self-cleaning, during the process of restoring the initial state by compressing the spring 7510, the locking hook 753 establishes a connection with the adjusting rod 743, thereby restoring the position limitation of the ring frame 751.

[0076] It should be noted that a torsion spring is provided at the rotatable connection shaft between the rotary seat 742 and the adjusting rod 743. The torsion spring is used to maintain the deflection angle between the adjusting rod 743 and the rotary seat 742, so that the locking hook 753 can re-establish the connection relationship after disengaging from the adjusting rod 743.

[0077] In a preferred embodiment, the filter residue storage box 755 includes a filter residue box 7551, which is fixedly mounted on the ring frame 751. A bottom plate 7552 is rotatably mounted on the bottom of the filter residue box 7551 at the end away from the ring frame 751.

[0078] It should be noted that during the self-cleaning process of the filter screen 757, the sliding of the ring frame 751 will drive the filter cake box 7551 to move. After the filter cake box 7551 is separated from the sealing ring 759, the filter cake temporarily stored in it will cause the bottom plate 7552 to rotate under the action of gravity. This will cause the bottom plate 7552 to scrape off the impurities adhering to the bottom plate 7552 when it comes into contact with the scraper 9, and finally cause the impurities to fall into the filter cake collection chamber 5 for storage.

[0079] When the ring frame 751 returns to its initial state, the base plate 7552 rotates under the action of the sealing ring 759 and docks with the filter cake box 7551.

[0080] A composite oil extraction connector, characterized in that it includes a sucker rod 61, a sleeve 62, an inner sleeve 63, a connector 64, and an oil self-cleaning filter device;

[0081] One end of connector 64 is connected to the oil pump of the oil self-cleaning filter device, and the other end is detached from the sleeve 62 through internal thread. The surface of connector 64 is treated with multi-alloy co-infiltration technology.

[0082] An inner sleeve 63 is fixed inside the sleeve joint 62. The outer wall of the inner sleeve 63 has a conical structure and three arc platforms are opened inside. The arc platforms are used to hold the sucker rod 61. A torque unloader, coupling, and centralizer treated with multi-alloy co-infiltration technology are installed on the sucker rod 61. The coupling is used to connect and separate sucker rods 61 of different numbers and specifications.

[0083] Torque unloaders are used to absorb, disperse, and reduce the torque and stress generated by the reciprocating motion of the driving equipment; stabilizers are used to stabilize the sucker rod 61 and prevent uneven wear.

[0084] In a preferred embodiment, the sucker rod 61 is made of fiber-reinforced composite material and is formed by one-time pultrusion thermosetting, with a maximum tensile force of 32 to 35 tons; after the inner sleeve 63 is processed as a whole, it is divided into two halves with a certain gap at the axial center position.

[0085] The outer wall of the inner sleeve 63 has the same taper as the inner wall of the sleeve joint 62, and the surface finish is required to be high. Under the action of tension, the inner sleeve 63 moves towards the small end of the sleeve joint 62, converting the axial tension into a radial force to clamp the sucker rod 61. As the axial force increases, the clamping force increases. Under the action of the arc platform of the inner sleeve 63, the sucker rod 61 is clamped tightly.

[0086] In practice, the beam pumping unit is started and the pumping pump is driven through the composite pumping joint. The pumping pump delivers the extracted crude oil to the housing 1 through the crude oil inlet 2. The filter assembly 75 filters impurities in the pumped crude oil. During the continuous impurity filtration process, the filter assembly 75 gradually reduces its filtration efficiency due to the adhesion of impurities. When the filtration limit is reached, the filter assembly 75 performs self-cleaning under the action of the adjusting spring 73, and discharges the impurities generated after cleaning into the filter residue collection chamber 5. After completing the self-cleaning, the filter assembly 75 returns to its initial state and continues to filter the extracted crude oil.

[0087] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A self-cleaning oil filtration device, characterized in that: include: The shell (1) has a crude oil inlet (2) at one end and an oil outlet (4) at the other end. The crude oil inlet (2) is connected to the oil outlet of the oil pump through a pipeline. The beam pumping unit drives the oil pump through a composite oil pumping joint. The oil outlet (4) is connected to the storage tank. The oil filtration mechanism (7) is installed inside the housing (1) and is used to filter crude oil. A slag discharge port (8) is provided through the housing (1) corresponding to the oil filtration mechanism (7). A slag collection chamber (5) is snapped and sealed on the slag discharge port (8). A scraper (9) is also provided inside the slag discharge port (8).

2. The petroleum self-cleaning filter device according to claim 1, characterized in that: The oil filtration mechanism (7) includes: an oil guide valve port (71), which is fixed to one end of the housing (1) near the crude oil inlet (2), and an adjusting ring (72) is provided by sliding seal between the oil guide valve port (71) and the housing (1), and an adjusting spring (73) is provided between the adjusting ring (72) and the oil guide valve port (71). Two control components (74) are symmetrically arranged inside the housing (1), with one end connected to the adjusting ring (72) and the other end connected to one end of the oil filter assembly (75), which is installed inside the housing (1). The mounting bracket (76) is fixed inside the housing (1) and connected to the other end of the oil filter assembly (75).

3. The petroleum self-cleaning filter device according to claim 2, characterized in that: The oil filter assembly (75) includes a ring frame (751), which is slidably disposed in the housing (1). A bearing (756) is fixedly disposed at the axis of the ring frame (751), and a nut (754) is coaxially disposed through the bearing (756). A scraper (758) is fixedly disposed on the nut (754). A lead screw (752) is fixedly mounted on the fixed frame (76), and the lead screw (752) is also threadedly connected to the nut (754); Two locking hooks (753) are symmetrically fixed on the ring frame (751) and engage with the control component (74).

4. The petroleum self-cleaning filter device according to claim 3, characterized in that: The oil filter assembly (75) also includes: a filter residue storage box (755), a filter screen (757), a sealing ring (759), and a compression spring (7510); The filter residue storage box (755) is fixedly mounted on the ring frame (751); the filter screen (757) is fixedly mounted on the ring frame (751); the sealing ring (759) is fixedly mounted on the housing (1) and is used to cooperate with the ring frame (751) to achieve sealing; The compression spring (7510) is sleeved on the lead screw (752), with one end connected to the fixed frame (76) and the other end connected to the ring frame (751).

5. The petroleum self-cleaning filter device according to claim 3, characterized in that: The control component (74) includes a retaining ring (741), which is fixedly mounted on the housing (1), and a rotating seat (742) is fixedly mounted on the retaining ring (741) corresponding to the locking hook (753). The adjusting rod (743) is rotatably mounted on the rotating seat (742), with one end engaged with the locking hook (753) and the other end rotatably mounted on one end of the telescopic adjuster (745). The other end of the telescopic adjuster (745) is rotatably mounted on the adjusting ring (72).

6. The petroleum self-cleaning filter device according to claim 4, characterized in that: The filter residue storage box (755) includes a filter residue box (7551), which is fixedly mounted on the ring frame (751). A bottom plate (7552) is rotatably mounted on the bottom of the filter residue box (7551) away from the ring frame (751).

7. A composite oil extraction connector, characterized in that: Includes a sucker rod (61), a sleeve (62), an inner sleeve (63), a connector (64), and the petroleum self-cleaning filter device according to any one of claims 1-6; One end of the connector (64) is connected to the oil pump of the oil self-cleaning filter device, and the other end is detached from the sleeve (62) through an internal thread. The surface of the connector (64) is treated with multi-element alloy co-infiltration technology. The inner sleeve (63) is fixed inside the socket (62). The outer wall of the inner sleeve (63) is conical and has three arc platforms inside. The arc platforms are used to hold the sucker rod (61). The sucker rod (61) is equipped with a torque unloader, coupling, and stabilizer treated with multi-alloy co-infiltration technology. The coupling is used to connect and separate sucker rods (61) of different numbers and specifications. The torque unloader is used to absorb, disperse, and reduce the torque and stress generated by the reciprocating motion of the driving equipment; the stabilizer is used to stabilize the sucker rod (61) and prevent uneven wear.

8. A composite oil extraction connector according to claim 7, characterized in that: The sucker rod (61) is made of fiber-reinforced composite material; after the inner sleeve (63) is processed as a whole, it is divided into two halves with a certain gap at the axial center position.

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