A method for treating oil leakage of an output shaft of an oil extraction machine

Abstract

The application relates to the technical field of oil pumping machines, and discloses an oil leakage treatment method for an output shaft of an oil pumping machine, which comprises the following steps: S1, analyzing the oil leakage principle and detecting the state of the output shaft of the oil pumping machine; S2, disassembling the output shaft assembly and judging the oil leakage cause; S3, designing an oil leakage treatment scheme; S4, manufacturing and preparing a new sealing piece; S5, installing the sealing piece and adjusting; S6, reassembling and testing. The oil leakage treatment method for the output shaft of the oil pumping machine has the advantages that the pressure of the dynamic ring on the sealing gasket and the packing is increased, the sealing gasket and the packing have good sealing performance and cannot leak, with long-time use, workpieces are abraded, the sealing performance of the sealing gasket and the packing is poor, the sealing gasket and the packing can improve the sealing effect by being rotated and adjusted again, the sealing piece does not need to be repeatedly disassembled, the method is practical and convenient, and the daily maintenance work of the output shaft of the oil pumping machine is greatly facilitated.

Description

Technical Field

[0001] This invention relates to the field of oil extraction machine technology, specifically to a method for treating oil leakage from the output shaft of an oil extraction machine. Background Technology

[0002] A pumping unit is a machine used for extracting oil, commonly known as a "nodding donkey" pump. It is the most important lifting device in a rod-type pumping system. Based on whether it has a walking beam, it can be divided into beam-type pumping units and beamless pumping units.

[0003] Chinese Patent CN202311805636.9 discloses a method for treating oil leakage from the output shaft of an oil extraction machine, belonging to the field of oil leakage treatment technology. The method includes the following steps: S1. Inspecting the output shaft of the oil extraction machine; S2. Disassembling the output shaft of the oil extraction machine; S3. Designing an oil leakage treatment plan: Through disassembly and observation, it is found that the skeleton oil seal has a certain amount of movement on the first-axis gear. By adding a shim between the skeleton oil seal and the bearing housing, the contact position between the skeleton oil seal and the first-axis gear is changed, thus solving the oil leakage problem without replacing the first-axis gear; S4. Shim fabrication; S5. Shim installation. This invention, through disassembly and observation, reveals that the skeleton oil seal has a certain amount of movement on the first-axis gear. By adding a shim between the skeleton oil seal and the bearing housing, the contact position between the skeleton oil seal and the first-axis gear is changed, thus solving the oil leakage problem without replacing the first-axis gear, thereby improving the service life of the first-axis gear.

[0004] The oil pumping unit's rocker arm is a closed structure, with only two points of contact with the outside world during normal operation: the input end and the output end. The input end is the primary shaft, sealed with a skeleton oil seal. The output end is the planetary carrier, sealed with a floating oil seal. The primary shaft operates at high speeds and under harsh conditions, making it prone to wear and leakage at the interface with the skeleton oil seal. This necessitates frequent replacement of seals and addition of lubricating oil, creating difficulties for the oil pumping unit's management.

[0005] Although the aforementioned patent proposes a novel sealing gasket, due to severe wear, it still requires frequent replacement of the seal and addition of lubricating oil. Moreover, relying solely on the sealing gasket or traditional sealing filler results in poor sealing performance. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a method for handling oil leakage from the output shaft of an oil pumping unit, thus solving the aforementioned problems.

[0007] This invention provides the following technical solution: a method for treating oil leakage from the output shaft of an oil extraction machine.

[0008] Includes the following steps:

[0009] S1, analyze the oil leakage principle and detect the status of the oil pumping unit output shaft;

[0010] S2, Disassemble the output shaft assembly to determine the cause of the oil leak;

[0011] S3, Design an oil leak handling plan, and specify a solution to the oil leak based on the cause of the oil leak obtained in S2;

[0012] S4, Make and prepare to replace the new seal; The housing of the seal is annular with a groove inside. The groove can be used to install the moving ring, the gasket and the filler. There is a cavity between the gasket and the groove of the housing, and the filler is filled inside the cavity.

[0013] S5, Install and adjust the seal: Determine the installation position, and ensure that the sealing gasket and packing of the seal are tightly wrapped around the output shaft by adjusting the bolts on the seal. Then, fix the installed seal with bolts.

[0014] S6, reassemble and test.

[0015] Preferably, in step S3, the sealing element includes a housing, the inside of which is provided with an installation groove, and the inside of the housing is provided with an annular airbag, a moving ring, a sealing gasket and a packing in sequence. The inner wall of the housing is provided with an adjustment groove, and the inside of the adjustment groove is provided with an abutment piece. The outer surface of the housing is threaded with an adjustment bolt, one end of which abuts against the abutment piece. By rotating the adjustment bolt, the abutment piece is driven to move closer to or away from the annular airbag, and the annular airbag is always in contact with the abutment piece.

[0016] Preferably, the packing is provided with an elastic spring, which is located inside the packing and does not contact the output shaft of the oil production machine. The elastic spring squeezes the packing so that it tightly wraps around the output shaft of the oil production machine. The elastic spring is provided with a compression air bladder, which is connected to an annular air bladder.

[0017] Preferably, the elastic spring is either V-shaped or U-shaped.

[0018] Preferably, the outer surface of the housing is provided with a plurality of screw holes, which are adapted to the oil extraction machine.

[0019] Preferably, a second sealing ring is installed on the side of the annular airbag and the moving ring near the output shaft of the oil production machine.

[0020] Preferably, the filler is composed of a mixture of modified polytetrafluoroethylene and graphite in a mass ratio of 3:0.8-1.2.

[0021] Preferably, the modified polytetrafluoroethylene includes the following processing steps:

[0022] A. A preliminary polytetrafluoroethylene material is prepared by pressing and sintering a mixture of polytetrafluoroethylene and boron nitride powder.

[0023] B. Preparation of soaking solution: Methyl acrylate, methyl methacrylate and epoxidized soybean oil are stirred and mixed, and then benzoyl peroxide initiator is added and mixed to obtain soaking solution;

[0024] C. Soak the preliminary polytetrafluoroethylene material obtained in step A in the soaking solution for 4-6 hours, and add glass fiber every 30 minutes. The total amount of glass fiber is half of boron nitride.

[0025] D. Remove the soaked expanded polytetrafluoroethylene sheet and dry it to obtain modified polytetrafluoroethylene.

[0026] Preferably, in step A, the mass ratio of polytetrafluoroethylene to boron nitride is 50:7-9, the sintering temperature is 400-460℃, the pressing method is cold pressing, and the cold pressing pressure is 27MPa~37MPa.

[0027] Preferably, in step B, the mass fraction ratio of methyl acrylate, methyl methacrylate, and epoxidized soybean oil is 50:10-30:2-5.

[0028] Compared with the prior art, the present invention provides a method for treating oil leakage from the output shaft of an oil pumping machine, which has the following beneficial effects:

[0029] (1) The method for handling oil leakage of the output shaft of the oil pumping machine is to rotate the adjusting bolt to drive the contact plate closer to or further away from the annular air bag, thereby adjusting the pressure of the annular air bag on the moving ring;

[0030] When the contact plate approaches the annular airbag, the moving ring is enlarged, and the pressure of the moving ring on the sealing gasket and packing increases, making the sealing gasket and packing more airtight and preventing leakage. With prolonged use, wear of the workpiece will lead to poor sealing of the sealing gasket and packing. At this time, turning the adjusting bolt again can improve the sealing effect of the sealing gasket and packing. There is no need to repeatedly disassemble the seals, which is practical and convenient, greatly facilitating the daily maintenance of the output shaft of the oil pumping machine.

[0031] (2) The oil leakage treatment method for the output shaft of the oil production machine. The fundamental reason for the poor wear resistance of polytetrafluoroethylene (PTFE) material is that its molecular chains are linear and unbranched, which makes it very easy to be peeled off in large areas under shear force during grinding. Boron nitride particles can be uniformly dispersed in the PTFE matrix as a physical filler. The presence of these particles will hinder the free sliding of PTFE molecular chains because the molecular chains will rub and entangle with the boron nitride particles when moving. This physical interaction can effectively limit the sliding of PTFE molecular chains and improve the overall stability and wear resistance of the material.

[0032] Boron nitride particles, acting as physical fillers within the PTFE matrix, occupy space previously held by PTFE molecular chains. This physical filling not only restricts the free movement of PTFE molecular chains but also reduces internal voids and defects, thereby improving the overall stability and density of the composite material. Boron nitride and PTFE are complementary in terms of properties. For example, the high hardness, high strength, and excellent thermal stability of boron nitride complement the low coefficient of friction and good chemical resistance of PTFE.

[0033] (3) The method for treating oil leakage from the output shaft of the oil extraction machine involves the initial polytetrafluoroethylene (PTFE) material prepared in step A. During the soaking process, epoxidized soybean oil, acting as a plasticizer, causes a certain swelling effect on PTFE. Acrylic esters and methyl methacrylates, with their small molecular weight, short chain segments, and monomeric nature, are more easily impregnated into the PTFE and evenly distributed throughout all pores of the PTFE sealing material, resulting in a deeper impregnation depth. The addition of glass fiber as a reinforcing material can significantly improve the mechanical properties of the composite material. Glass fiber possesses high modulus, high strength, and excellent corrosion resistance. Its addition can effectively enhance the tensile strength, flexural strength, and wear resistance of the composite material. Simultaneously, glass fiber can also serve as a skeletal structure, supporting and dispersing the PTFE matrix, further improving the overall performance of the composite material.

[0034] In systems where glass fibers coexist with acrylates and methyl methacrylate (MDMA), a synergistic effect may occur. On one hand, acrylates and MDMA can penetrate to the interface between glass fibers and polytetrafluoroethylene (PTFE), enhancing the interfacial bonding between the two and preventing glass fiber detachment and delamination. On the other hand, the addition of glass fibers may provide more attachment points and dispersion pathways for acrylates and MDMA, contributing to their uniform distribution within the PTFE matrix.

[0035] Therefore, the modified polytetrafluoroethylene prepared in this application has good wear resistance and corrosion resistance, as well as excellent thermal stability and low coefficient of friction, which greatly improves the sealing performance of the seal. Attached Figure Description

[0036] Figure 1 This is a schematic diagram illustrating the logic of the present invention;

[0037] Figure 2 This is a schematic diagram of the sealing element structure in Embodiment 1 of the present invention;

[0038] Figure 3 For the present invention Figure 2 Schematic diagram of the middle shell structure;

[0039] Figure 4 This is a schematic diagram of the sealing element structure in Embodiment 2 of the present invention;

[0040] Figure 5 For the present invention Figure 4 Schematic diagram of the middle shell structure;

[0041] Figure 6 This is a schematic diagram of the U-shaped elastic spring structure of the present invention.

[0042] Figure 7 This is a schematic diagram of the V-shaped elastic spring structure of the present invention.

[0043] In the diagram: 1. Shell; 2. Annular airbag; 3. Moving ring; 4. Sealing gasket; 5. Packing; 6. Adjusting groove; 7. Contact plate; 8. Adjusting bolt; 9. Elastic spring; 10. Compression airbag; 11. Second sealing ring; 12. Output shaft of the oil pumping unit. Detailed Implementation

[0044] Please see Figure 1-7 Example 1: A method for treating oil leakage from the output shaft of an oil extraction machine, comprising the following steps:

[0045] S1, analyze the oil leakage principle and detect the status of the oil pumping unit output shaft;

[0046] S2, Disassemble the output shaft assembly to determine the cause of the oil leak;

[0047] S3, Design an oil leak handling plan, and specify a solution to the oil leak based on the cause of the oil leak obtained in S2;

[0048] S4, Make and prepare to replace the new seal; The housing of the seal is annular with a groove inside. The groove can be used to install the moving ring, the gasket and the filler. There is a cavity between the gasket and the groove of the housing, and the filler is filled inside the cavity.

[0049] S5, Install and adjust the seal: Determine the installation position, and ensure that the sealing gasket and packing of the seal are tightly wrapped around the output shaft by adjusting the bolts on the seal. Then, fix the installed seal with bolts.

[0050] S6, reassemble and test.

[0051] Furthermore, in step S3, the sealing element includes a housing 1, the inside of which is provided with an installation groove. Inside the housing 1, an annular airbag 2, a moving ring 3, a sealing gasket 4, and a filler 5 are arranged in sequence. An adjustment groove 6 is provided on the inner wall of the housing 1. An abutment piece 7 is provided inside the adjustment groove 6. An adjustment bolt 8 is threadedly connected to the outer surface of the housing 1. One end of the adjustment bolt 8 abuts against the abutment piece 7. By rotating the adjustment bolt 8, the abutment piece 7 is driven to move closer to or away from the annular airbag 2, and the annular airbag 2 is always in contact with the abutment piece 7.

[0052] The outer surface of the housing 2 is provided with multiple screw holes, which are adapted to the oil extraction machine.

[0053] The annular airbag 2 and the moving ring 3 are both equipped with a second sealing ring 11 on the side near the output shaft of the oil production machine.

[0054] The filler is composed of a mixture of modified polytetrafluoroethylene and graphite in a mass ratio of 3:0.8-1.2.

[0055] The modified polytetrafluoroethylene includes the following processing steps:

[0056] A. A preliminary polytetrafluoroethylene material is prepared by pressing and sintering a mixture of polytetrafluoroethylene and boron nitride powder.

[0057] B. Preparation of soaking solution: Methyl acrylate, methyl methacrylate and epoxidized soybean oil are stirred and mixed, and then benzoyl peroxide initiator is added and mixed to obtain soaking solution;

[0058] C. Soak the preliminary polytetrafluoroethylene material obtained in step A in the soaking solution for 4-6 hours, and add glass fiber every 30 minutes. The total amount of glass fiber is half of boron nitride.

[0059] D. Remove the soaked expanded polytetrafluoroethylene sheet and dry it to obtain modified polytetrafluoroethylene.

[0060] In step A, the mass ratio of polytetrafluoroethylene to boron nitride is 50:7-9, the sintering temperature is 400-460℃, the pressing method is cold pressing, and the cold pressing pressure is 27MPa~37MPa.

[0061] In step B, the mass fraction ratio of methyl acrylate, methyl methacrylate, and epoxidized soybean oil is 50:10-30:2-5.

[0062] Example 2: The difference between this example and Example 1 is that the packing 5 is provided with an elastic spring 9. The elastic spring 9 is located inside the packing 5 and does not contact the output shaft of the oil production machine. The elastic spring 9 squeezes the packing 5 so that it tightly wraps around the output shaft of the oil production machine. The elastic spring 9 is provided with a compression airbag 10 inside the packing 5. The compression airbag 10 is connected to the annular airbag 2.

[0063] The elastic spring is either V-shaped or U-shaped.

[0064] Example 3: The difference between this example and Example 1 is that the filler is composed of a mixture of modified polytetrafluoroethylene and graphite in a mass ratio of 3:0.8.

[0065] The modified polytetrafluoroethylene includes the following processing steps:

[0066] A. A preliminary polytetrafluoroethylene material is prepared by pressing and sintering a mixture of polytetrafluoroethylene and boron nitride powder.

[0067] B. Preparation of soaking solution: Methyl acrylate, methyl methacrylate and epoxidized soybean oil are stirred and mixed, and then benzoyl peroxide initiator is added and mixed to obtain soaking solution;

[0068] C. Soak the preliminary polytetrafluoroethylene material obtained in step A in the soaking solution for 4 hours, and add glass fiber every 30 minutes. The total amount of glass fiber is half of boron nitride.

[0069] D. Remove the soaked expanded polytetrafluoroethylene sheet and dry it to obtain modified polytetrafluoroethylene.

[0070] In step A, the mass ratio of polytetrafluoroethylene to boron nitride is 50:7, the sintering temperature is 400°C, the pressing method is cold pressing, and the cold pressing pressure is 27 MPa.

[0071] In step B, the mass fraction ratio of methyl acrylate, methyl methacrylate, and epoxidized soybean oil is 50:10:2.

[0072] Example 4: The difference between this example and Example 1 is that the filler is composed of a mixture of modified polytetrafluoroethylene and graphite in a mass ratio of 3:1.

[0073] The modified polytetrafluoroethylene includes the following processing steps:

[0074] A. A preliminary polytetrafluoroethylene material is prepared by pressing and sintering a mixture of polytetrafluoroethylene and boron nitride powder.

[0075] B. Preparation of soaking solution: Methyl acrylate, methyl methacrylate and epoxidized soybean oil are stirred and mixed, and then benzoyl peroxide initiator is added and mixed to obtain soaking solution;

[0076] C. Soak the preliminary polytetrafluoroethylene material obtained in step A in the soaking solution for 5 hours, and add glass fiber every 30 minutes. The total amount of glass fiber is half of boron nitride.

[0077] D. Remove the soaked expanded polytetrafluoroethylene sheet and dry it to obtain modified polytetrafluoroethylene.

[0078] In step A, the mass ratio of polytetrafluoroethylene to boron nitride is 50:8, the sintering temperature is 430°C, the pressing method is cold pressing, and the cold pressing pressure is 31 MPa.

[0079] In step B, the mass fraction ratio of methyl acrylate, methyl methacrylate, and epoxidized soybean oil is 50:20:3.

[0080] Example 5: The difference between this example and Example 1 is that the filler is composed of a mixture of modified polytetrafluoroethylene and graphite in a mass ratio of 3:1.

[0081] The modified polytetrafluoroethylene includes the following processing steps:

[0082] A. A preliminary polytetrafluoroethylene material is prepared by pressing and sintering a mixture of polytetrafluoroethylene and boron nitride powder.

[0083] B. Preparation of soaking solution: Methyl acrylate, methyl methacrylate and epoxidized soybean oil are stirred and mixed, and then benzoyl peroxide initiator is added and mixed to obtain soaking solution;

[0084] C. Soak the preliminary polytetrafluoroethylene material obtained in step A in the soaking solution for 5 hours, and add glass fiber every 30 minutes. The total amount of glass fiber is half of boron nitride.

[0085] D. Remove the soaked expanded polytetrafluoroethylene sheet and dry it to obtain modified polytetrafluoroethylene.

[0086] In step A, the mass ratio of polytetrafluoroethylene to boron nitride is 50:8, the sintering temperature is 440°C, the pressing method is cold pressing, and the cold pressing pressure is 30 MPa.

[0087] In step B, the mass fraction ratio of methyl acrylate, methyl methacrylate, and epoxidized soybean oil is 50:20:3.

[0088] Performance tests were conducted on the modified PTFE products prepared in Examples 3-5 and commonly available PTFE products. Each example or comparative example contained 30 sealing material samples, and the average value of 10 sets of data was taken. The test results are shown in the table below:

[0089] During testing, a compression rebound tester was used to test the compression rate and rebound rate of the samples obtained from each example and comparative example according to ASTM F36 and GB / T12622 standards.

[0090] The creep properties and leakage rate of the samples from each embodiment and comparative embodiment were tested according to ASTM F38-B.

[0091] Volumetric wear rate: The volumetric wear rate of the gaskets prepared in the examples and comparative examples was tested according to GB / T3960-2016.

[0092]

[0093] The polytetrafluoroethylene valve sealing material prepared by this invention has a high resilience and compressibility, while its creep relaxation rate and leakage rate are low, and it has good creep resistance, sealing performance and volume wear rate.

[0094] In summary, the method for handling oil leakage from the output shaft of this oil extraction machine is to adjust the pressure of the annular airbag 2 on the moving ring 3 by rotating the adjusting bolt 8 to move the contact plate 7 closer to or further away from the annular airbag 2.

[0095] When the contact plate 7 approaches the annular airbag 2, the moving ring 3 is enlarged, and the pressure of the moving ring 3 on the sealing gasket 4 and the packing 5 increases, making the sealing gasket 4 and the packing 5 well-sealed and preventing leakage. With long-term use, the workpiece wears down, which leads to poor sealing performance of the sealing gasket 4 and the packing 5. At this time, turning the adjusting bolt 8 again can improve the sealing effect of the sealing gasket 4 and the packing 5. There is no need to repeatedly disassemble the sealing components, which is practical and convenient, and greatly facilitates the daily maintenance of the output shaft of the oil pumping machine.

[0096] The fundamental reason for the poor wear resistance of polytetrafluoroethylene (PTFE) is that its molecular chains are linear and unbranched, making it extremely prone to large-area peeling under shear force during wear. Boron nitride particles can be uniformly dispersed in the PTFE matrix, existing as a physical filler. The presence of these particles hinders the free sliding of PTFE molecular chains because the molecular chains rub and entangle with the boron nitride particles as they move. This physical interaction effectively restricts the sliding of PTFE molecular chains, improving the overall stability and wear resistance of the material.

[0097] Boron nitride particles, acting as physical fillers within the PTFE matrix, occupy space previously held by PTFE molecular chains. This physical filling not only restricts the free movement of PTFE molecular chains but also reduces internal voids and defects, thereby improving the overall stability and density of the composite material. Boron nitride and PTFE are complementary in terms of properties. For example, the high hardness, high strength, and excellent thermal stability of boron nitride complement the low coefficient of friction and good chemical resistance of PTFE.

[0098] The initial PTFE material prepared in step A undergoes a swelling effect during impregnation, where epoxidized soybean oil acts as a plasticizer. Acrylic esters and methyl methacrylates, with their small molecular weight, short chain segments, and monomeric nature, more easily penetrate the PTFE and distribute evenly throughout all pores of the PTFE sealing material, resulting in deeper impregnation. The addition of glass fiber as a reinforcing material significantly improves the mechanical properties of the composite material. Glass fiber possesses high modulus, high strength, and excellent corrosion resistance; its addition effectively enhances the tensile strength, flexural strength, and abrasion resistance of the composite material. Simultaneously, glass fiber also serves as a skeletal structure, supporting and dispersing the PTFE matrix, further improving the overall performance of the composite material.

[0099] In systems where glass fibers coexist with acrylates and methyl methacrylate (MDMA), a synergistic effect may occur. On one hand, acrylates and MDMA can penetrate to the interface between glass fibers and polytetrafluoroethylene (PTFE), enhancing the interfacial bonding between the two and preventing glass fiber detachment and delamination. On the other hand, the addition of glass fibers may provide more attachment points and dispersion pathways for acrylates and MDMA, contributing to their uniform distribution within the PTFE matrix.

[0100] Therefore, the modified polytetrafluoroethylene prepared in this application has good wear resistance and corrosion resistance, as well as excellent thermal stability and low coefficient of friction, which greatly improves the sealing performance of the seal.

Claims

1. A method for treating oil leakage from the output shaft of an oil extraction machine, characterized in that, Includes the following steps: S1, analyze the oil leakage principle and detect the status of the oil pumping unit output shaft; S2, Disassemble the output shaft assembly to determine the cause of the oil leak; S3, Design an oil leak handling plan, and specify a solution to the oil leak based on the cause of the oil leak obtained in S2; S4, Make and prepare to replace the new seal; The housing of the seal is annular with a groove inside. The groove can be used to install the moving ring, the gasket and the filler. There is a cavity between the gasket and the groove of the housing, and the filler is filled inside the cavity. S5, Install and adjust the seal: Determine the installation position, and ensure that the sealing gasket and packing of the seal are tightly wrapped around the output shaft by adjusting the bolts on the seal. Then, fix the installed seal with bolts. S6, reassemble and test.

2. The method for treating oil leakage from the output shaft of an oil extraction machine according to claim 1, characterized in that: In step S3, the sealing element includes a housing (1), the inside of which is provided with an installation groove. The inside of the housing (1) is provided with an annular airbag (2), a moving ring (3), a sealing gasket (4) and a filler (5) in sequence. An adjustment groove (6) is provided on the inner wall of the housing (1). An abutment piece (7) is provided inside the adjustment groove (6). An adjustment bolt (8) is threadedly connected to the outer surface of the housing (1). One end of the adjustment bolt (8) abuts against the abutment piece (7). By rotating the adjustment bolt (8), the abutment piece (7) is driven to move closer to or away from the annular airbag (2), and the annular airbag (2) is always in contact with the abutment piece (7).

3. The method for treating oil leakage from the output shaft of an oil extraction machine according to claim 2, characterized in that: The packing (5) is provided with an elastic spring (9), which is located inside the packing (5) and does not contact the output shaft of the oil production machine. The elastic spring (9) squeezes the packing (5) so that it tightly wraps around the output shaft of the oil production machine. The elastic spring (9) is provided with a compression airbag (10), which is connected to the annular airbag (2).

4. The method for treating oil leakage from the output shaft of an oil extraction machine according to claim 3, characterized in that: The elastic spring is either V-shaped or U-shaped.

5. A method for treating oil leakage from the output shaft of an oil extraction machine according to claim 2, characterized in that: The outer surface of the housing (2) is provided with multiple screw holes, which are adapted to the oil extraction machine.

6. The method for treating oil leakage from the output shaft of an oil extraction machine according to claim 2, characterized in that: The annular airbag (2) and the moving ring (3) are both equipped with a second sealing ring (11) on the side near the output shaft of the oil production machine.

7. The method for treating oil leakage from the output shaft of an oil extraction machine according to claim 1, characterized in that: The filler is composed of a mixture of modified polytetrafluoroethylene and graphite in a mass ratio of 3:0.8-1.

2.

8. A method for treating oil leakage from the output shaft of an oil extraction machine according to claim 7, characterized in that: The modified polytetrafluoroethylene includes the following processing steps: A. A preliminary polytetrafluoroethylene material is prepared by pressing and sintering a mixture of polytetrafluoroethylene and boron nitride powder. B. Preparation of soaking solution: Methyl acrylate, methyl methacrylate and epoxidized soybean oil are stirred and mixed, and then benzoyl peroxide initiator is added and mixed to obtain soaking solution; C. Soak the preliminary polytetrafluoroethylene material obtained in step A in the soaking solution for 4-6 hours, and add glass fiber every 30 minutes. The total amount of glass fiber is half of boron nitride. D. Remove the soaked expanded polytetrafluoroethylene sheet and dry it to obtain modified polytetrafluoroethylene.

9. A method for treating oil leakage from the output shaft of an oil extraction machine according to claim 8, characterized in that: In step A, the mass ratio of polytetrafluoroethylene to boron nitride is 50:7-9, the sintering temperature is 400-460℃, the pressing method is cold pressing, and the cold pressing pressure is 27MPa~37MPa.

10. A method for treating oil leakage from the output shaft of an oil extraction machine according to claim 8, characterized in that: In step B, the mass fraction ratio of methyl acrylate, methyl methacrylate, and epoxidized soybean oil is 50:10-30:2-5.

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