Petroleum self-cleaning filtering device and combined type oil pumping connector

Abstract

The invention discloses a petroleum self-cleaning filtering device and a combined type oil pumping connector, and relates to the field of petroleum filtration, the petroleum self-cleaning filtering device comprises a shell, one end of the shell is provided with a crude oil inlet, the other end of the shell is provided with a petroleum outlet, the crude oil inlet is communicated with an oil outlet of an oil well pump through a pipeline, and a beam type oil pumping unit drives the oil well pump through the combined type oil pumping connector. The petroleum outlet is communicated with the storage tank; the oil filtering mechanism is mounted in the shell and is used for filtering crude oil; a residue discharging opening is formed in the position, corresponding to the oil filtering mechanism, of the shell in a penetrating mode, and a filter residue collecting bin is arranged on the residue discharging opening in a clamped and sealed mode; and a scraping plate is also arranged in the slag discharging opening. When a cleaning condition is met through the filtering device, the oil filtering mechanism can automatically clean the oil filtering mechanism, so that the overall filtering efficiency is improved; meanwhile, the combined type oil pumping connector can effectively prevent the combined type oil pumping connector from falling off and being twisted off, and meanwhile the corrosion resistance of the combined type oil pumping connector is improved.

Description

Technical Field

[0001] The present invention relates to the field of petroleum filtration, and in particular to a petroleum self-cleaning filtration device and a composite oil extraction joint. Background Art

[0002] Oil, one of the core objects of geological exploration, is a viscous, dark brown liquid known as the "lifeline of industry". It is mainly found in the shallow areas of the earth's crust and has a complex structure, consisting of many alkanes, cycloalkanes and aromatic hydrocarbons. Oil is not only the main source of fuels such as fuel oil and gasoline, but also plays the role of a key raw material for a variety of products in the chemical industry, covering solvents, fertilizers, pesticides and plastics. However, crude oil extracted from the ground is often mixed with impurities and foreign matter, and must be filtered to remove impurities before pure petroleum products can be obtained. In the existing oil filtration and extraction equipment, there are the following problems: 1. The real-time filtering equipment for petroleum cannot be cleaned automatically. Usually, it is necessary to manually remove the filter screen for active cleaning after completing one stage of filtration. The manual cleaning method is not only cumbersome, but also reduces the overall efficiency of filtration. 2. The filtering status and cleaning time of the filter cannot be accurately controlled. Frequent cleaning may cause excessive wear of the filter, and untimely cleaning may lead to poor oil filtration efficiency. 3. During operation, the sucker rod joints are prone to falling off, breaking, and corrosion.

[0003] In view of the above problems, the present invention provides a petroleum self-cleaning filtering device and a composite oil pumping joint to solve the above problems. Summary of the invention

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: a self-cleaning oil filter device, comprising: a housing, a crude oil inlet is arranged at one end of the housing, and a crude oil outlet is arranged at the other end, the crude oil inlet is connected to the oil outlet of the oil pump through a pipeline, the beam-type oil pump drives the oil pump through a composite oil pumping joint, and the oil outlet is connected to a storage tank; The oil filter mechanism is installed in the shell and is used for filtering crude oil. A slag discharge port is provided through the shell corresponding to the oil filter mechanism, and a filter residue collection bin is provided on the slag discharge port in a sealed manner. A scraper is also provided in the slag discharge port.

[0005] Further, preferably, the oil filter mechanism comprises: an oil guide valve port, the oil guide valve port is fixed at one end of the housing close to the crude oil inlet, an adjustment ring is arranged through the sliding seal between the oil guide valve port and the housing, and an adjustment spring is arranged between the adjustment ring and the oil guide valve port; Two control components are symmetrically arranged in the housing, and one end of each control component is connected to the adjustment ring, and the other end of each control component is connected to one end of the oil filter component, and the oil filter component is installed in the housing; The fixing frame is fixed in the shell and connected with the other end of the oil filter assembly.

[0006] Further, preferably, the oil filter assembly comprises a ring frame, the ring frame is slidably arranged in the housing, a bearing is fixedly arranged at the axis of the ring frame, a nut is coaxially arranged through the bearing, and a scraper plate is fixedly arranged on the nut; A lead screw is fixedly arranged on a fixed frame and is also threadedly connected to a nut; Two locking hooks are symmetrically fixed on the ring frame and are clamped with the control component.

[0007] Further, preferably, the oil filter assembly further comprises: a filter residue temporary storage box, a filter screen, a sealing ring, and a compression spring; The filter residue temporary storage box is fixedly arranged on the ring frame; the filter screen is fixedly arranged on the ring frame; the sealing sleeve ring is fixedly arranged on the housing to cooperate with the ring frame to achieve sealing; The compression spring is sleeved on the lead screw, one end of which is connected to the fixing frame, and the other end of which is connected to the ring frame.

[0008] Further, preferably, the control assembly comprises a fixing ring, the fixing ring is fixedly arranged on the housing, and a swivel seat is fixedly arranged on the fixing ring corresponding to the locking hook; The adjusting rod is rotatably arranged on the rotating seat, one end of which is clamped with the lock hook, and the other end of which is rotatably arranged on one end of the telescopic adjuster, and the other end of the telescopic adjuster is rotatably arranged on the adjusting ring.

[0009] Further, preferably, the filter residue temporary storage box comprises a filter residue box, the filter residue box is fixedly arranged on the ring frame, and a bottom plate is rotatably arranged at the bottom of the filter residue box away from one end of the ring frame.

[0010] A composite oil pumping joint, characterized in that it comprises an oil pumping rod, a sleeve joint, an inner sleeve, a connecting head and an oil self-cleaning filter device; One end of the connector is connected to the oil pump of the oil self-cleaning filter device, and the other end is detachably connected to the sleeve joint through an internal thread, and the surface of the connector is treated by multi-element alloy co-penetration technology; The inner sleeve is fixed in the sleeve joint, the outer wall of the inner sleeve is a conical structure, and three arc platforms are opened inside, the arc platforms are used to hold the sucker rod tightly, and the sucker rod is provided with a torque unloader, a coupling and a centralizer treated by multi-element alloy co-infiltration technology, and the coupling is used to connect and separate the sucker rods 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 device; the centralizer is used to centralize and prevent eccentric wear of the sucker rod.

[0011] Further, preferably, the sucker rod is made of fiber-reinforced composite material; after the inner sleeve is integrally processed, it is divided into two halves at the axial center position and has a certain gap.

[0012] Compared with the prior art, the present invention provides a petroleum self-cleaning filter device and a composite oil pumping joint, which have the following beneficial effects: 1. During the crude oil filtration process, the impurities adhering to the oil filter mechanism 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 filter mechanism gradually increases the oil storage space to maintain the extraction efficiency of the oil pump. When the maximum oil storage space of the filter mechanism is reached, the filter mechanism automatically cleans the impurities adhering to it. When the cleaned impurities pass through the slag discharge port, the scraper scrapes the impurities and makes them fall into the filter residue collection bin for storage, thereby realizing the self-cleaning of the filter screen during the crude oil filtration process and improving the overall efficiency of crude oil filtration.

[0013] 2. When the oil filter mechanism reaches the cleaning conditions, it will automatically clean the filter to avoid wear of the filter due to excessive cleaning and reduction of filtering efficiency due to untimely cleaning.

[0014] 3. The outer wall of the inner sleeve and the inner wall of the sleeve joint have the same taper and high surface finish. At the same time, the arc platform set on the inner sleeve holds the sucker rod tightly, that is, when the sucker rod is subjected to axial tension, the inner sleeve will be moved toward the lower end of the sleeve joint synchronously, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an overall schematic diagram of a petroleum self-cleaning filter device; Figure 2 This is an enlarged schematic diagram of the structure of location A of a petroleum self-cleaning filter device; Figure 3 A schematic diagram of the connection of an oil filter assembly of a petroleum self-cleaning filter device; Figure 4 This is an enlarged schematic diagram of the structure at B of a petroleum self-cleaning filter device; Figure 5 This is an enlarged schematic diagram of the structure at position C of a petroleum self-cleaning filter device; Figure 6 This is an enlarged schematic diagram of the structure at D of a petroleum self-cleaning filter device; Figure 7 This is a schematic diagram of a slag discharge port of a petroleum self-cleaning filter device; Figure 8 It is a schematic diagram of the internal structure connection of the composite oil pumping joint; Fig. 9 It is a schematic diagram of the inner sleeve structure of the composite oil pumping joint; Fig.10 It is a top view schematic diagram of the inner sleeve of the composite oil pumping joint; Fig.11 It is a schematic diagram of the structure of the composite oil pumping joint connector; Fig.12 It is a top view schematic diagram of the composite oil pumping joint connection head; In the figure: 1, shell; 2, crude oil inlet; 4, oil outlet; 5, filter residue collection bin; 61, sucker rod; 62, sleeve joint; 63, inner sleeve; 64, connector; 7, oil filter mechanism; 71, oil guide valve port; 72, adjusting ring; 73, adjusting spring; 74, control assembly; 741, fixing ring; 742, swivel seat; 743, adjusting rod; 745, telescopic adjuster; 75, oil filter assembly; 751, ring frame; 752, lead screw; 753, locking hook; 754, nut; 755, filter residue temporary storage box; 7551, filter residue box; 7552, bottom plate; 756, bearing; 757, filter screen; 758, scraper plate; 759, sealing ring; 7510, compression spring; 76, fixing frame; 8, slag discharge port; 9, scraper plate. DETAILED DESCRIPTION

[0016] Reference Figures 1 to 12 The present invention provides a technical solution: a petroleum self-cleaning filtering device, comprising: a housing 1, a crude oil inlet 2 is arranged at one end of the housing 1, and a petroleum outlet 4 is arranged 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, and the oil outlet 4 is connected to a storage tank; The oil filter mechanism 7 is installed in the shell 1 and is used for filtering crude oil. A slag discharge port 8 is provided through the shell 1 corresponding to the oil filter mechanism 7, and a filter residue collecting bin 5 is provided on the slag discharge port 8 for sealing. A scraper 9 is also provided in the slag discharge port 8.

[0017] The beam pumping unit is started, and the beam pumping unit drives the oil pump to extract the stratum crude oil through the composite oil extraction joint. The crude oil extracted by the oil pump flows into the housing 1 through the crude oil inlet 2 through the pipeline. At this time, the crude oil is filtered of impurities under the action of the oil filtering mechanism 7. The filtered crude oil flows to the storage tank through the oil outlet 4 for storage.

[0018] During the process of the oil filter mechanism 7 filtering crude oil, the impurities adhering to the oil filter mechanism 7 will gradually increase, thereby causing the filtering efficiency to gradually decrease. At this time, when the filtering efficiency gradually decreases and is less than the extraction efficiency of the oil pump, the oil filter mechanism 7 will relatively gradually increase the oil storage space; when the maximum oil storage space of the oil filter mechanism 7 is reached, the oil filter mechanism 7 automatically cleans the impurities adhering thereto, and the cleaned impurities are scraped off by the scraper 9 when passing through the slag discharge port 8 and fall into the filter residue collection bin 5 for storage.

[0019] After the oil filter mechanism 7 completes self-cleaning, it returns to the initial filtering state, and the above process is repeated to continuously filter the impurities in the crude oil produced by the oil pump, thereby ensuring real-time filtration of the produced crude oil, reducing the impurity content in the crude oil, and improving the efficiency of crude oil production and subsequent processing.

[0020] As a preferred embodiment, the oil filter mechanism 7 includes: an oil guide valve port 71, the oil guide valve port 71 is fixed at one end of the housing 1 close to the crude oil inlet 2, an adjustment ring 72 is provided through the sliding seal between the oil guide valve port 71 and the housing 1, and an adjustment spring 73 is provided between the adjustment ring 72 and the oil guide valve port 71; Two control components 74 are symmetrically arranged in the housing 1, and one end of each control component is connected to the adjustment ring 72, and the other end of each control component is connected to one end of the oil filter component 75. The oil filter component 75 is installed in the housing 1; The fixing frame 76 is fixed in the housing 1 and connected to the other end of the oil filter assembly 75 .

[0021] 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 impurities in the crude oil are filtered under the action of the oil filter assembly 75 .

[0022] When the impurities adhering to the oil filter assembly 75 gradually increase, resulting in the filtering efficiency being lower than the extraction efficiency of the oil pump, the continuous entry of crude oil causes the adjustment ring 72 to slide toward the side close to the crude oil inlet 2, thereby increasing the oil storage space. When the adjustment ring 72 slides, the adjustment spring 73 is compressed and the state of the control assembly 74 is adjusted. When the oil storage space increases and gradually approaches the limit, the continued entry of crude oil causes the adjustment ring 72 to continue to slide, thereby causing the control assembly 74 to change the connection state with the oil filter assembly 75. When the oil storage space reaches the limit (the adjustment ring 72 slides to the limit), the connection state between the control assembly 74 and the oil filter assembly 75 is released. Under the action of the adjustment spring 73, the adjustment ring 72 pushes the crude oil to act on the oil filter assembly 75, thereby causing the oil filter assembly 75 to self-clean the impurities adhering to it. After the self-cleaning of the impurities is completed, the oil filter assembly 75 returns to its initial state and reconnects with the control assembly 74.

[0023] As a preferred embodiment, 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, a nut 754 is coaxially disposed through the bearing 756, a scraper plate 758 is fixedly disposed on the nut 754, and a limit platform is further disposed on the ring frame 751, the limit platform abuts against the housing 1, and is used to limit the rotation of the ring frame 751; The lead screw 752 is fixedly disposed on the fixing frame 76 and is also threadedly connected to the nut 754; The two locking hooks 753 are symmetrically fixed on the ring frame 751 and are engaged with the control assembly 74 .

[0024] As a preferred embodiment, the oil filter assembly 75 further includes: a filter residue temporary storage box 755, a filter screen 757, a sealing ring 759, and a compression spring 7510; The filter residue temporary storage box 755 is fixedly arranged on the ring frame 751; the filter screen 757 is fixedly arranged on the ring frame 751; the sealing ring 759 is fixedly arranged 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 , one end of which is connected to the fixing frame 76 , and the other end of which is connected to the ring frame 751 .

[0025] It should be noted that the filter 757 filters the impurities in the crude oil, and the impurities adhere to the filter 757 under the action of the crude oil, so that the impurities gradually clog the mesh during the filtering of the crude oil by the filter 757, causing the filtering efficiency of the filter 757 for the crude oil to gradually decrease.

[0026] When the efficiency of the filter screen 757 in filtering crude oil is lower than the efficiency of the oil pump in pumping crude oil, part of the crude oil that is not filtered in time will act on the adjustment ring 72, causing the adjustment ring 72 to slide to increase the oil storage space. At the same time, the movement of the adjustment ring 72 will also gradually compress the adjustment spring 73 and change the state of the control component 74. When the adjustment ring 72 gradually slides to the limit position (the oil storage space gradually reaches the limit), the continued movement of the adjustment ring 72 will cause the control component 74 to gradually deflect; when the adjustment ring 72 reaches the limit sliding position, the deflection of the control component 74 will cause it to be disconnected from the lock hook 753, so that the ring frame 751 and the filter screen 757 slide in the housing 1 through the crude oil under the action of the adjustment spring 73.

[0027] When the ring frame 751 slides, the nut 754 starts to rotate under the action of the screw 752. The rotation of the nut 754 causes the scraper plate 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 just makes the scraper plate 758 rotate on the filter screen 757 for a full number of circles, that is, after the scraping is completed, the scraper plate 758 will stay at the initial position.

[0028] After the scraper plate 758 has finished cleaning the impurities adhering to the surface of the filter screen 757, the impurities will be concentrated and accumulated above the filter residue temporary storage box 755. Under the action of gravity, more impurities will gradually flow into the filter residue temporary storage box 755 for collection.

[0029] When cleaning impurities on the filter 757, the sliding of the ring frame 751 will squeeze the compression spring 7510. After the scraper plate 758 completes the removal of impurities on the filter 757, the elastic force generated by the compression spring 7510 can restore the ring frame 751 to its original state, and at the same time establish a connection between the locking hook 753 and the control component 74.

[0030] As a preferred embodiment, the control assembly 74 includes a fixing ring 741, which is fixedly arranged on the housing 1, and a rotating seat 742 is fixedly arranged on the fixing ring 741 corresponding to the locking hook 753; The adjusting rod 743 is rotatably arranged on the rotating seat 742 , one end of which is engaged with the locking hook 753 , and the other end of which is rotatably arranged on one end of the telescopic adjuster 745 , and the other end of the telescopic adjuster 745 is rotatably arranged on the adjusting ring 72 .

[0031] It should be noted that during the movement of the adjusting ring 72, the length of the telescopic adjuster 745 will be adaptively changed. When the telescopic adjuster 745 reaches the limit state and the 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 rotate it. When the adjusting ring 72 moves to the limit position, the rotation angle of the adjusting rod 743 will cause it to be disconnected from the locking hook 753, that is, the position limit of the ring frame 751 is released, so that the ring frame 751 can use the adjusting ring 72 and crude oil to push the ring frame 751 to move under the action of the adjusting spring 73, so as to achieve the self-cleaning effect of the filter screen 757.

[0032] After the filter screen 757 completes self-cleaning, the locking hook 753 is connected to the adjusting rod 743 by compressing the spring 7510 to restore the initial state, thereby restoring the position limitation of the ring frame 751.

[0033] It should be noted that a torsion spring is provided at the rotation connection axis between the swivel seat 742 and the adjusting rod 743, and the torsion spring is used to maintain the deflection angle between the adjusting rod 743 and the swivel seat 742, so that the locking hook 753 can re-establish the connection relationship after being separated from the adjusting rod 743.

[0034] As a preferred embodiment, the filter residue temporary storage box 755 includes a filter residue box 7551, which is fixedly arranged on the ring frame 751, and a bottom plate 7552 is rotatably arranged at the bottom of the filter residue box 7551 away from the ring frame 751.

[0035] 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 residue box 7551 to move. After the filter residue box 7551 is separated from the sealing ring 759, the filter residue temporarily stored therein causes the bottom plate 7552 to rotate under the action of gravity, so that when the bottom plate 7552 contacts the scraper 9, the impurities adhering to the bottom plate 7552 are scraped off, and finally the impurities fall into the filter residue collection bin 5 for storage.

[0036] When the ring frame 751 returns to its initial state, the bottom plate 7552 rotates under the action of the sealing ring 759 and docks with the filter residue box 7551 .

[0037] A composite oil pumping joint, characterized in that it comprises an oil pumping rod 61, a sleeve joint 62, an inner sleeve 63, a connector 64 and an oil self-cleaning filter device; One end of the connector 64 is connected to the oil pump of the oil self-cleaning filter device, and the other end is detachably connected to the sleeve connector 62 through an internal thread, and the surface of the connector 64 is treated by multi-element alloy co-penetration technology; An inner sleeve 63 is fixed in the sleeve joint 62. The outer wall of the inner sleeve 63 is a conical structure, and three arc platforms are opened inside. The arc platforms are used to hold the sucker rod 61 tightly. The sucker rod 61 is provided with a torque unloader, a coupling and a centralizer treated by multi-element 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 centralizer is used to centralize the sucker rod 61 and prevent eccentric wear.

[0038] As a preferred embodiment, the sucker rod 61 is a fiber-reinforced composite material and is formed by one-time pultrusion and thermosetting, with a maximum pulling force of 32 tons to 35 tons; after the inner sleeve 63 is processed as a whole, it is divided into two halves at the axial center position with a certain gap.

[0039] The outer wall of the inner sleeve 63 and the inner wall of the sleeve joint 62 have the same taper and high surface finish requirements. In this way, under the action of tension, the inner sleeve 63 moves toward the small end of the sleeve joint 62, converting the axial tension into 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.

[0040] During specific implementation, the beam pumping unit is started to drive the oil pump through the composite oil pumping joint. The oil pump pumps the produced crude oil into the casing 1 through the crude oil inlet 2. The oil filter assembly 75 filters impurities in the pumped crude oil. During the continuous impurity filtering process, the filtration efficiency of the oil filter assembly 75 gradually decreases due to the adhesion of impurities. When the filtration limit is reached, the oil 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 bin 5. After completing the self-cleaning, the oil filter assembly 75 returns to its initial state and continues to filter the produced crude oil.

[0041] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A self-cleaning oil filter, characterized in that: include: A shell (1), wherein a crude oil inlet (2) is provided at one end of the shell (1), and a crude oil outlet (4) is provided at the other end, wherein the crude oil inlet (2) is connected to the oil outlet of the oil pump through a pipeline, the beam-type oil pump drives the oil pump through a composite oil pumping joint, and the oil outlet (4) is connected to a storage tank; an oil filter mechanism (7), wherein the oil filter mechanism (7) is installed in the shell (1) and is used to filter the crude oil; a slag discharge port (8) is provided through the shell (1) and corresponds to the oil filter mechanism (7), and a filter residue collection bin (5) is provided on the slag discharge port (8) in a clamping and sealing manner; and a scraper (9) is also provided in the slag discharge port (8).

2. A petroleum self-cleaning filter device according to claim 1, characterized in that: The oil filter mechanism (7) comprises: an oil guide valve port (71), the oil guide valve port (71) being fixed to one end of the housing (1) close to the crude oil inlet (2), an adjusting ring (72) being arranged through a sliding seal between the oil guide valve port (71) and the housing (1), and an adjusting spring (73) being arranged between the adjusting ring (72) and the oil guide valve port (71); Two control assemblies (74) are symmetrically arranged in the housing (1), one end of each control assembly is connected to the adjustment ring (72), and the other end is connected to one end of an oil filter assembly (75), and the oil filter assembly (75) is installed in the housing (1); A fixing frame (76) is fixed in the housing (1) and connected to the other end of the oil filter assembly (75).

3. A petroleum self-cleaning filter device according to claim 2, characterized in that: The oil filter assembly (75) comprises a ring frame (751), the ring frame (751) being slidably disposed in the housing (1), a bearing (756) being fixedly disposed at the axis of the ring frame (751), a nut (754) being coaxially disposed via the bearing (756), and a scraper plate (758) being fixedly disposed on the nut (754); A lead screw (752) is fixedly disposed on the fixing 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 are engaged with the control assembly (74).

4. A petroleum self-cleaning filter device according to claim 3, characterized in that: The oil filter assembly (75) further comprises: a filter residue temporary storage box (755), a filter screen (757), a sealing ring (759), and a compression spring (7510); The filter residue temporary storage box (755) is fixedly arranged on the ring frame (751); the filter screen (757) is fixedly arranged on the ring frame (751); the sealing ring (759) is fixedly arranged 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), one end of which is connected to the fixing frame (76), and the other end of which is connected to the ring frame (751).

5. The petroleum self-cleaning filter device according to claim 3, characterized in that: The control component (74) comprises a fixing ring (741), the fixing ring (741) being fixedly arranged on the housing (1), and a rotating seat (742) being fixedly arranged on the fixing ring (741) corresponding to the locking hook (753); The adjusting rod (743) is rotatably mounted on the rotating seat (742), one end of which is engaged with the locking hook (753), and the other end of which is rotatably mounted on one end of a telescopic adjuster (745), and the other end of which 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 temporary storage box (755) comprises a filter residue box (7551), wherein the filter residue box (7551) is fixedly arranged on the ring frame (751), and a bottom plate (7552) is rotatably arranged at the bottom of one end of the filter residue box (7551) away from the ring frame (751).

7. A composite oil pumping joint, characterized in that: It comprises a sucker rod (61), a sleeve joint (62), an inner sleeve (63), a connector (64), and a petroleum self-cleaning filter device according to any one of claims 1 to 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 detachably connected to the sleeve joint (62) via an internal thread, and the surface of the connector (64) is treated by a multi-element alloy co-penetration technology; The inner sleeve (63) is fixed in the sleeve joint (62); the outer wall of the inner sleeve (63) is in a conical structure and has three arc steps inside; the arc steps are used to hold the sucker rod (61) tightly; a torque unloader, a coupling and a centralizer treated by a multi-element alloy co-infiltration technology are arranged on the sucker rod (61); 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 device; the centralizer is used to centralize and prevent eccentric wear of the sucker rod (61).

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

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