A layered oil extraction pump

Abstract

The utility model discloses a layered oil extraction oil pump, including layered oil extraction oil pump body, the layered oil extraction oil pump body includes pump machine body, the first connecting pipe of intercommunication fixed in the pump machine body extraction end, the bottom disc of intercommunication fixed in the left end of first connecting pipe, the tank body pressure boost mechanism of intercommunication fixed in the bottom disc and inside not setting sealed ball, the square connecting pipe of intercommunication fixed in the left side bottom of bottom disc and the adjusting valve of setting in square connecting pipe left side. The utility model discloses through setting up a series of structures, has built the safe and reliable one -way flow mechanism, can through the oil liquid safety one -way flow and prevent backflow in the mode of not shifting of rotating opening to supply when sucking, avoid the damage or failure of the fan blade in the tank body pressure boost mechanism own inside to cause it, improve the security of equipment operation, and can collect the pre -filtration interception of solid residue impurity in the oil liquid before the oil liquid enters the tank body pressure boost mechanism, reduce the jam or dead phenomenon, further improve the stability of equipment operation.

Description

Technical Field

[0001] This utility model relates to the field of oil pump equipment technology, specifically a stratified oil extraction pump. Background Technology

[0002] An oil pump is a downhole device that uses a pumping unit to lift crude oil from a well to the surface. A typical oil pump mainly consists of four parts: a pump barrel, a suction valve, a piston, and a discharge valve. Based on how the oil pump is fixed downhole, it can be divided into tubular pumps and rod pumps. During operation, some oil may have high viscosity, which can cause the internal valve components of the pump to stick together, resulting in blockage of the oil and affecting the normal operation of the entire pump.

[0003] In response, Chinese Patent Publication No. CN215633834U discloses a stratified oil extraction pump, including a pump body, a fixed frame welded to one end of the pump body, a housing installed on one side of the fixed frame, a flange connected to one side of the housing, a first connecting pipe connected to the housing through the flange, a chassis connected to one end of the first connecting pipe, a reversing pipe welded to the bottom of the chassis, a baffle installed inside the reversing pipe, a support seat installed at the top of the baffle, a bearing embedded on the top surface of the support seat, a drive shaft movably connected to the support seat through the bearing, a fan blade fitted on the outer wall of the drive shaft, a tank threadedly connected to the top of the chassis and the reversing pipe, a concave bracket installed on one side of the inner wall of the tank, and one side of the concave bracket connected to one side of the baffle, a hole opened at the bottom of the concave bracket, and a sealing ball placed at the top of the hole; this stratified oil extraction pump has a simple and reasonable structure, a novel design, can effectively improve working efficiency, and is simple and convenient to install, and has high practical value.

[0004] The aforementioned technology discloses a stratified oil extraction pump that, through the construction of a tank and internal structures such as baffles, fan blades, and a drive shaft, combined with an external motor, drives the fan blades to rotate at high speed, thereby increasing the oil flow rate and reducing adhesion and blockage. The pump also prevents backflow by cooperating with a concave bracket inside the tank and sealing balls. However, the following shortcomings exist: 1. (The design utilizes the upward movement of the sealing balls during suction to unseal and their downward fall due to gravity when suction is lost to prevent backflow). However, this design has low safety. Because the fan blades are located above the sealing balls, the sealing balls are easily damaged by suction and oil impact, leading to unsatisfactory safety. 2. It cannot pre-filter solid impurities in the oil before it enters the tank. Solid impurities directly entering the tank can cause blockage and fan blade jamming, reducing operational stability. Therefore, this stratified oil extraction pump is proposed to address these problems.

[0005] The stratified oil pump disclosed in the above technology, through the cooperation of internal baffles, fan blades, drive shafts, and other structures with an external motor, utilizes the high-speed rotation of the fan blades to increase the oil flow rate, effectively reducing adhesion and blockage problems. Simultaneously, the cooperation between the concave brackets and sealing balls inside the tank prevents backflow of oil, thus optimizing the pump's performance to a certain extent. However, this design still has the following significant shortcomings in practical applications:

[0006] 1. (Its anti-backflow mechanism relies on the dynamic movement of the sealing balls—the sealing balls move upward to unseal during suction, and fall downward to seal when the suction force disappears). However, this design has significant safety hazards: because the fan blades are located above the sealing balls, the sealing balls are very likely to move upward into the fan blade area when subjected to suction force and oil impact, causing damage or malfunction of the fan blades, seriously affecting the safety of equipment operation; 2. The lack of a pretreatment stage for the oil means that solid residues and impurities cannot be pre-filtered before the oil enters the tank. This causes solid residues and impurities to directly enter the tank, easily leading to accumulation and blockage, and even causing the fan blades to jam, significantly reducing the stability of equipment operation; In view of the above problems, it is necessary to optimize and improve the existing structure, and thus a new type of stratified oil pump is proposed to solve the above technical defects. Utility Model Content

[0007] The purpose of this invention is to provide a stratified oil production pump to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a stratified oil extraction pump, comprising a stratified oil extraction pump body, wherein the stratified oil extraction pump body includes a pump body, a first connecting pipe connected and fixed to the extraction end of the pump body, a chassis connected and fixed to the left end of the first connecting pipe, a tank pressurization mechanism connected and fixed inside the chassis and without internal sealing balls, a square connecting pipe connected and fixed to the bottom left side of the chassis, and a regulating valve disposed on the left side of the square connecting pipe, wherein a pre-filter anti-backflow mechanism is installed between the square connecting pipe and the regulating valve;

[0009] The pre-filter anti-backflow mechanism includes...

[0010] A circular tube, the bottom end of which is configured as a sealing structure, and the bottom right side of the circular tube is connected and fixed to the left end of the square connecting tube;

[0011] A Z-shaped tube is fixed between the top left side of the round tube and the right end of the regulating valve.

[0012] A threaded screw-on fastener assembly is threaded onto the outer side of the top end of a circular tube. A cylindrical stainless steel filter screen with an open top is movably fastened inside the threaded screw-on fastener assembly and located within the circular tube. The threaded screw-on fastener assembly is used for easy connection and disconnection with the circular tube and for supporting the cylindrical stainless steel filter screen. The cylindrical stainless steel filter screen filters and intercepts solid impurities in the oil as it passes through, preventing a large amount of solid impurities from entering the tank's pressurization mechanism and causing blockage or jamming of the internal pressurization components.

[0013] The one-way flow anti-backflow component is installed inside the square connecting pipe; the one-way flow anti-backflow component is used to ensure that the oil flows safely into the tank pressurization mechanism in one direction and to prevent the oil from flowing back.

[0014] Preferably, the threaded fastener assembly includes an internal threaded sleeve, a U-shaped handle, thin rods, a retaining ring, and locking pins. The internal threaded sleeve is threaded onto the outer side of the top end of the round tube. The U-shaped handle is fixedly connected to the top of the internal threaded sleeve. There are two thin rods, both of which are fixedly connected to the inner wall of the top of the internal threaded sleeve. The retaining ring is movably sleeved inside the round tube and fixedly connected to the bottom ends of the two thin rods. The inner side of the retaining ring has a stepped groove with an open top. There are two locking pins, both of which are fixedly connected to the inner wall of the bottom of the stepped groove.

[0015] The buckle is movably sleeved on the outside of the cylindrical stainless steel filter screen. The top of the outer side of the cylindrical stainless steel filter screen is integrally provided with an outer edge that is movably sleeved in the stepped groove. Both sides of the top of the outer edge are provided with locking holes, and two locking posts are respectively movably locked in the corresponding locking holes.

[0016] Preferably, the one-way flow anti-backflow assembly includes a U-shaped limiting rod, a counterweight sealing plate, and a support shaft. The U-shaped limiting rod is fixedly fitted inside the square connecting pipe, and the support shaft is fixedly connected to the upper part between the front and rear inner walls of the square connecting pipe. The counterweight sealing plate is rotatably fitted on the support shaft. The top and bottom of the counterweight sealing plate are both designed with an arc shape. The outer side of the counterweight sealing plate is bonded and covered with a sealing rubber that is in movable contact with the inner side of the square connecting pipe. The left side of the sealing rubber is in movable contact with the right side of the U-shaped limiting rod.

[0017] Preferably, a sealing gasket is adhered and fixed to the top inner wall of the internal threaded sleeve, and the bottom of the sealing gasket is pressed tightly against the top of the round tube.

[0018] Preferably, the outer top of the circular tube is provided with an external thread, which is screwed into the internal thread sleeve.

[0019] Preferably, a T-shaped support is fixedly connected between the right side of the circular tube and the left side of the tank pressurization mechanism.

[0020] Preferably, the front top of the counterweight sealing plate has a circular through hole, and two bearings are fixedly fitted inside the circular through hole, with the inner ring of the bearings fixedly fitted to the outer side of the support shaft.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. By setting up square connecting pipes, round pipes, Z-shaped pipes, and a one-way flow anti-backflow component, a safe and reliable one-way flow mechanism is constructed. During the suction process, this component achieves one-way oil flow into the tank pressurization mechanism by rotating and opening, which can both ensure oil entry and effectively prevent backflow. Its rotating and displacement-free unsealing and oil-passing design fundamentally avoids the equipment damage or failure caused by the movement of traditional displacement unsealing parts into the fan blade area inside the tank pressurization mechanism, which significantly improves the safety of equipment operation.

[0023] 2. By using the set round pipe, threaded screw-on fastener assembly and cylindrical stainless steel filter screen in coordination, the solid residue impurities can be pre-filtered and intercepted before the oil enters the tank pressurization mechanism. This design can effectively prevent solid residue impurities from directly invading the inside of the tank, reduce the blockage caused by impurities and the jamming of the internal fan blade pressurization components of the tank pressurization mechanism, and further enhance the stability of equipment operation.

[0024] In addition, the cylindrical stainless steel filter screen can be quickly removed for cleaning or replacement with a simple rotation operation, which greatly simplifies the later maintenance process, provides convenience for the staff, and improves the ease of use of the equipment. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a stratified oil extraction pump proposed in this utility model;

[0026] Figure 2 This utility model presents a three-dimensional structural diagram of the regulating valve, square connecting pipe, chassis, tank pressurization mechanism, and pre-filter anti-backflow mechanism connecting parts of a stratified oil production pump.

[0027] Figure 3 for Figure 1 Enlarged cross-sectional view of part A in the diagram;

[0028] Figure 4 for Figure 3 A magnified structural diagram of part B in the diagram;

[0029] Figure 5 for Figure 3 A magnified structural diagram of part C in the diagram.

[0030] In the diagram: 1. Pump body; 101. Chassis; 102. Tank pressurization mechanism; 103. First connecting pipe; 104. Regulating valve; 2. Round pipe; 201. Square connecting pipe; 202. Z-shaped pipe; 3. Internal threaded sleeve; 301. Sealing gasket; 302. U-shaped handle; 303. Thin rod; 304. Buckle; 305. Step groove; 306. Locking post; 4. Cylindrical stainless steel filter screen; 401. Locking hole; 5. Recurved limit rod; 501. Support shaft; 502. Counterweight sealing plate. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Example 1

[0033] like Figure 1 As shown:

[0034] This embodiment proposes a stratified oil production pump, including a stratified oil production pump body. The stratified oil production pump body includes a pump body 1, a first connecting pipe 103 connected and fixed to the extraction end of the pump body 1, a chassis 101 connected and fixed to the left end of the first connecting pipe 103, a tank pressurization mechanism 102 connected and fixed inside the chassis 101 and without sealing balls, a square connecting pipe 201 connected and fixed to the bottom left side of the chassis 101, and a regulating valve 104 disposed on the left side of the square connecting pipe 201.

[0035] In this implementation plan: The existing device {publication (announcement) number}: CN215633834U discloses a stratified oil production pump. The stratified oil production pump body in this application is the existing stratified oil production pump, the difference being that the concave bracket and sealing balls inside the tank pressurization mechanism 102 for preventing backflow are removed. Other aspects adopt the same technical means as in this prior art, which will not be described in detail here. This application further improves the existing body, for details please refer to the following disclosure; In order to solve the technical problems existing in this prior art, such as the "the design still has the following obvious shortcomings in practical application" disclosed in the background art above: 1. (Its anti-backflow mechanism relies on the dynamic movement of the sealing balls - during suction, the sealing balls (The sealing ball moves upward to release the seal, and falls back down to seal when the suction force disappears.) However, this design has significant safety hazards: 1. Because the fan blade is located above the sealing ball, the sealing ball is easily pushed upward into the fan blade area when subjected to suction force and oil impact, causing damage or malfunction of the fan blade and seriously affecting the safety of equipment operation; 2. The lack of a pre-treatment process for the oil means that solid residues and impurities cannot be pre-filtered before the oil enters the tank. This causes solid residues and impurities to directly enter the tank, easily leading to accumulation and blockage, and even causing the fan blade to jam, significantly reducing the stability of equipment operation. In terms of practical use, this problem is obviously a real and difficult-to-solve issue. Therefore, to solve this technical problem, a pre-filtration anti-backflow mechanism has been added to this application.

[0036] It should be noted that the tank pressurization mechanism 102 is a technology already disclosed in the prior art, therefore the internal structure is not fully described or drawn. The components used are disclosed in publication number CN215633834U. The difference is that the concave bracket and sealing ball inside the tank pressurization mechanism 102 for preventing backflow have been removed. For its pressurization effect, please refer to publication number CN215633834U (i.e., the "tank, motor, fan blade, baffle, reversing pipe, support base, and drive shaft" disclosed in this prior art).

[0037] Furthermore:

[0038] like Figures 1-5 As shown: A pre-filter anti-backflow mechanism is installed between the square connecting pipe 201 and the regulating valve 104;

[0039] The pre-filter backflow prevention mechanism includes...

[0040] The bottom of the circular tube 2 is set as a sealing structure. The bottom right side of the circular tube 2 is connected and fixed to the left end of the square connecting tube 201. A T-shaped support is fixedly connected between the right side of the circular tube 2 and the left side of the tank pressurization mechanism 102, which has the effect of strengthening the support of the circular tube 2.

[0041] Z-shaped tube 202 is fixed between the top left side of round tube 2 and the right end of regulating valve 104;

[0042] The threaded screw-on fastener assembly is threaded onto the outer side of the top of the round tube 2. A cylindrical stainless steel filter screen 4 with an open top is movably fastened inside the threaded screw-on fastener assembly and is located inside the round tube 2. The threaded screw-on fastener assembly is used to easily connect and disconnect from the round tube 2 and to support the cylindrical stainless steel filter screen 4. The cylindrical stainless steel filter screen 4 is used to filter and intercept solid residue impurities in the oil when the oil passes through, so as to prevent a large amount of solid residue from entering the tank pressurization mechanism 102 and causing blockage and jamming of its internal pressurization components.

[0043] A one-way flow anti-backflow component is installed inside the square connecting pipe 201. The one-way flow anti-backflow component is used to ensure that the oil is safely and unidirectionally introduced into the tank pressurization mechanism 102 and to prevent the oil from flowing back.

[0044] To go even further, such as Figure 2 , 3 As shown in Figure 4, the threaded fastening assembly includes an internal threaded sleeve 3, a U-shaped handle 302, thin rods 303, a retaining ring 304, and a locking post 306. The internal threaded sleeve 3 is threaded onto the outer side of the top end of the round tube 2. The U-shaped handle 302 is fixedly connected to the top of the internal threaded sleeve 3. There are two thin rods 303, both of which are fixedly connected to the inner wall of the top of the internal threaded sleeve 3. The retaining ring 304 is movably sleeved inside the round tube 2 and fixedly connected to the bottom ends of the two thin rods 303. The inner side of the retaining ring 304 has a stepped groove 305 with an open top. There are two locking posts 306, both of which are fixedly connected to the inner wall of the bottom of the stepped groove 305.

[0045] The buckle 304 is movably sleeved on the outside of the cylindrical stainless steel filter screen 4. The top of the outer side of the cylindrical stainless steel filter screen 4 is integrally provided with an outer edge that is movably sleeved in the stepped groove 305. The top two sides of the outer edge are provided with locking holes 401, and two locking posts 306 are respectively movably locked in the corresponding locking holes 401.

[0046] In this embodiment, a sealing gasket 301 is bonded and fixed on the top inner wall of the internal threaded sleeve 3. The bottom of the sealing gasket 301 is squeezed and contacted with the top of the round tube 2. The sealing gasket 301 serves to seal between the internal threaded sleeve 3 and the top of the round tube 2. An external thread is provided on the top of the outer side of the round tube 2, and the external thread is screwed into the internal threaded sleeve 3.

[0047] In this implementation scheme, the internal threaded cover 3, U-shaped handle 302, thin rod 303, buckle 304, and locking post 306 work together. The internal threaded cover 3 is screwed onto the outer thread of the top of the round tube 2. The buckle 304 is supported by the two thin rods 303. The buckle 304 and the two locking posts 306 fasten and support the cylindrical stainless steel filter screen 4 to prevent it from falling off. The screw-on method allows personnel to easily screw the internal threaded cover 3 onto or off the round tube 2 by simply rotating it. The screw-on design allows personnel to easily move the internal threaded cover 3 upwards so that it moves the cylindrical stainless steel filter screen 4 upwards through the thin rod 303 and buckle 304. This facilitates the removal, cleaning, or replacement of the cylindrical stainless steel filter screen 4, achieving the effect of supporting the cylindrical stainless steel filter screen 4 and making it easy to remove, clean, and replace.

[0048] To go even further, such as Figure 2 , 3 As shown in Figure 5, the one-way flow anti-backflow assembly includes a loop-shaped limiting rod 5, a counterweight sealing plate 502, and a support shaft 501. The loop-shaped limiting rod 5 is fixedly fitted inside the square connecting pipe 201. The support shaft 501 is fixedly connected to the upper part between the front and rear inner walls of the square connecting pipe 201. The counterweight sealing plate 502 is rotatably fitted on the support shaft 501. The top and bottom of the counterweight sealing plate 502 are both set as arc-shaped structures. The outer side of the counterweight sealing plate 502 is covered with a sealing rubber that is in movable contact with the inner side of the square connecting pipe 201. The left side of the sealing rubber is in movable contact with the right side of the loop-shaped limiting rod 5.

[0049] In this embodiment, a circular through hole is provided on the top front side of the counterweight sealing plate 502. Two bearings are fixedly fitted inside the circular through hole. The inner ring of the bearing is fixedly fitted to the outer side of the support shaft 501, which achieves the effect of rotating and installing the counterweight sealing plate 502.

[0050] In this implementation scheme, the counterweight sealing plate 502 and the support shaft 501 work together to block and limit the counterweight sealing plate 502 on the left side, so that it can only be rotated to the right to open. When the suction force is generated to draw oil, the suction force drives the counterweight sealing plate 502 to rotate to the right on the support shaft 501 to open, allowing the oil to flow. When the suction force disappears, the counterweight sealing plate 502 automatically rotates downward to reset and contact the right side of the counterweight sealing plate 5 under its own gravity, thus sealing the inside of the connecting pipe 201 to prevent backflow. This achieves the effect of safe unidirectional flow of oil into the tank pressurization mechanism 102 and prevents the oil from flowing back.

[0051] It should be noted that the round tube 2, thin rod 303, buckle 304, locking post 306 and loop-shaped limit rod 5 are all made of stainless steel. The stainless steel material has the advantages of high hardness, strong corrosion resistance and good maintenance-free effect, which ensures long-term application stability.

[0052] It should be noted that, under the action of the suction force on the right side, the counterweight sealing plate 502 can be sucked open to the right, causing the counterweight sealing plate 502 to rotate to the right on the support shaft 501. This is common knowledge.

[0053] The usage method of this embodiment is as follows: When the stratified oil extraction pump is in use, when the pump body 1 starts, it sequentially draws oil through the first connecting pipe 103, the tank pressurization mechanism 102, the square connecting pipe 201, the round pipe 2, the Z-shaped pipe 202, and the regulating valve 104. The counterweight sealing plate 502 is blocked and limited on the left side by the U-shaped limiting rod 5, so that it can only rotate to the right to open. When the suction force is generated to draw oil, the suction force drives the counterweight sealing plate 502 to rotate to the right on the support shaft 501 to open, allowing oil to flow through, and the suction force is eliminated. When the counterweight sealing plate 502 is lost, under its own gravity, it automatically rotates downward to reset and contacts the right side of the loop limit rod 5, sealing the inside of the opposite connecting pipe 201 to prevent backflow. This achieves the effect of safe one-way flow of oil into the tank pressurization mechanism 102 and prevents backflow of oil. Under the suction force, the rotating opening method of unsealing and oil passage without displacement can effectively avoid the phenomenon that the displaced unsealing parts can easily enter the fan blades inside the tank pressurization mechanism 102 itself, causing damage or failure, thus improving the safety of equipment operation.

[0054] When the oil is drawn into the circular pipe 2 for flow, the cylindrical stainless steel filter screen 4 is used to pre-filter and intercept solid impurities in the oil, preventing a large amount of solid residue from entering the tank pressurization mechanism 102 and causing internal blockage or jamming of the fan blade pressurization components, thus further improving the stability of equipment operation. When the cylindrical stainless steel filter screen 4 needs to be removed for cleaning or replacement after subsequent use, the U-shaped handle 302 is rotated in the reverse direction to cause the internal threaded sleeve 3 to be screwed off from the external thread on the top of the outer side of the circular pipe 2, thus disconnecting the connection between the two. The internal threaded sleeve 3 is then moved upwards, causing the cylindrical stainless steel filter screen 4 to move upwards in sequence through the thin rod 303 and the retaining ring 304. The cylindrical stainless steel filter screen 4 can be removed upwards from the buckle 304. The cylindrical stainless steel filter screen 4 causes the two locking holes 401 to separate from the two locking posts 306, which allows for the cleaning of solid residues and impurities inside the cylindrical stainless steel filter screen 4 or for the replacement of the cylindrical stainless steel filter screen 4. Then, the cylindrical stainless steel filter screen 4 is inserted into the buckle 304 and locked onto the two locking posts 306, and then inserted into the round tube 2. Finally, the internal threaded sleeve 3 is rotated clockwise to tighten the screw connection with the outer side of the top of the round tube 2. This simple rotation method allows for convenient and quick removal of the cylindrical stainless steel filter screen 4 for cleaning or replacement, providing convenience for subsequent cleaning work and making it easy for personnel to use.

[0055] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A stratified oil extraction pump, comprising a stratified oil extraction pump body, the stratified oil extraction pump body comprising a pump body (1), a first connecting pipe (103) connected and fixed to the extraction end of the pump body (1), a chassis (101) connected and fixed to the left end of the first connecting pipe (103), a tank pressurization mechanism (102) connected and fixed inside the chassis (101) and without sealing balls, a square connecting pipe (201) connected and fixed to the bottom left side of the chassis (101), and a regulating valve (104) disposed on the left side of the square connecting pipe (201), characterized in that: A pre-filter anti-backflow mechanism is installed between the square connecting pipe (201) and the regulating valve (104); The pre-filter anti-backflow mechanism includes: The bottom end of the circular tube (2) is set as a sealing structure, and the bottom right side of the circular tube (2) is connected and fixed to the left end of the square connecting tube (201); Z-shaped tube (202) is fixed between the top left side of the round tube (2) and the right end of the regulating valve (104); The threaded screw-on fastener assembly is threadedly screwed onto the outer side of the top end of the round tube (2). The threaded screw-on fastener assembly is movably fastened with a cylindrical stainless steel filter screen (4) with an open top. The cylindrical stainless steel filter screen (4) is located inside the round tube (2). A one-way flow anti-backflow component is installed inside the square connecting pipe (201).

2. The stratified oil production pump according to claim 1, characterized in that: The threaded fastening assembly includes an internal threaded cover (3), a U-shaped handle (302), thin rods (303), a buckle (304), and a locking post (306). The internal threaded cover (3) is threaded onto the outer side of the top of the round tube (2). The U-shaped handle (302) is fixedly connected to the top of the internal threaded cover (3). There are two thin rods (303), both of which are fixedly connected to the inner wall of the top of the internal threaded cover (3). The buckle (304) is movably fitted inside the round tube (2) and fixedly connected to the bottom ends of the two thin rods (303). The inner side of the buckle (304) has a stepped groove (305) with an open top. There are two locking posts (306), both of which are fixedly connected to the inner wall of the bottom of the stepped groove (305). The buckle (304) is movably sleeved on the outside of the cylindrical stainless steel filter screen (4). The top of the outer side of the cylindrical stainless steel filter screen (4) is integrally provided with an outer edge that is movably sleeved in the stepped groove (305). Both sides of the top of the outer edge are provided with locking holes (401), and two locking posts (306) are respectively movably locked in the corresponding locking holes (401).

3. The stratified oil production pump according to claim 1, characterized in that: The one-way flow anti-backflow assembly includes a loop-shaped limiting rod (5), a counterweight sealing plate (502), and a support shaft (501). The loop-shaped limiting rod (5) is fixedly fitted inside the square connecting tube (201). The support shaft (501) is fixedly connected to the upper part between the front and rear inner walls of the square connecting tube (201). The counterweight sealing plate (502) is rotatably fitted on the support shaft (501). The top and bottom of the counterweight sealing plate (502) are both set as arc-shaped structures. The outer side of the counterweight sealing plate (502) is covered with a sealing rubber that is in active contact with the inner side of the square connecting tube (201). The left side of the sealing rubber is in active contact with the right side of the loop-shaped limiting rod (5).

4. A stratified oil production pump according to claim 2, characterized in that: A sealing gasket (301) is bonded and fixed to the top inner wall of the internal threaded sleeve (3), and the bottom of the sealing gasket (301) is pressed tightly against the top of the round tube (2).

5. A stratified oil production pump according to claim 2, characterized in that: The outer top of the round tube (2) is provided with an external thread, which is screwed into the internal thread sleeve (3).

6. A stratified oil production pump according to claim 1, characterized in that: A T-shaped support is fixedly connected between the right side of the circular tube (2) and the left side of the tank pressurization mechanism (102).

7. A stratified oil production pump according to claim 3, characterized in that: The counterweight sealing plate (502) has a circular perforation at the top front side, and two bearings are fixedly fitted inside the circular perforation. The inner ring of the bearing is fixedly fitted to the outer side of the support shaft (501).

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