A flange for petroleum production equipment
By combining the clamp-type structure with the sealing ring, the problem of loose connection and sealing failure of union flanges used in oil extraction equipment under complex working conditions is solved, achieving efficient sealing and vibration resistance, and ensuring the safety and stability of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QIANJIANG PETROLEUM MASCH CO LTD
- Filing Date
- 2025-08-29
- Publication Date
- 2026-07-10
AI Technical Summary
Existing oil extraction equipment using union flanges is prone to loosening and sealing failure under complex and harsh working conditions, leading to media leakage, resulting in resource waste, environmental pollution, and safety accidents.
The design combines a clamp-type structure with a sealing ring. The clamp is mechanically connected to the pipe body and locked with a fastening screw and nut. Combined with the elastic deformation of the sealing ring, a double sealing barrier is formed, which enhances vibration resistance and sealing reliability.
It improves the stability and sealing of flange connections, prevents media leakage, and ensures the safe and efficient operation of oil extraction equipment under complex working conditions.
Smart Images
Figure CN224479405U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of union flange technology, specifically a union flange for oil extraction equipment. Background Technology
[0002] Union flanges are a common type of pipe fitting used in the oil and gas industries. Also known as union joints or union fittings, they are widely used as important connecting components in the oil extraction process for connecting various pipelines and equipment.
[0003] However, there are still some problems with the use of union flanges in existing oil extraction equipment:
[0004] For example, a union flange for oil extraction equipment with application number CN202322155200.1 relates to the field of flange technology. It includes a flange body, an internal groove is provided inside the flange body, and four corresponding first insertion slots are provided inside the flange body and on one side of the internal groove. A first insertion plate is inserted into the first insertion slot, and a filter plate is fixedly connected to one end of the four first insertion plates. The filter plate is inserted into the internal groove. An outer shell is sleeved on the outside of the flange body. Four corresponding second insertion slots are provided on one side of the flange body, and a second insertion block is inserted into the second insertion slot. A sealing gasket is fixedly connected to one end of the four second insertion blocks. A pipe body is threaded inside the outer shell.
[0005] Existing flange connection methods often rely solely on bolts to directly fasten flanges to connect pipelines. When faced with the complex and harsh working conditions of oil extraction, such as frequent vibrations, large pressure fluctuations, and corrosion of the connection points by the medium, problems such as loose connections and seal failures are prone to occur, leading to medium leakage. This not only causes resource waste and environmental pollution, but may also cause safety accidents, affecting the normal operation of oil extraction and the service life of equipment.
[0006] Therefore, we propose a union flange for oil extraction equipment to solve the problems mentioned above. Utility Model Content
[0007] The purpose of this utility model is to provide a union flange for oil extraction equipment to solve the problems mentioned in the background art. The flange connection method often relies solely on bolts to directly fasten the flange to connect the pipeline. In the face of the complex and harsh working conditions of oil extraction, such as frequent vibration, large pressure fluctuations, and corrosion of the connection parts by the medium, problems such as loose connection and sealing failure are likely to occur, leading to medium leakage. This not only causes resource waste and environmental pollution, but may also cause safety accidents, affecting the normal operation of oil extraction and the service life of equipment.
[0008] To achieve the above objectives, this utility model provides the following technical solution: a union flange for oil extraction equipment, comprising a flange body and a pipe body, wherein the pipe body is connected to the lower part of the flange body, and a first clamp and a second clamp are fitted onto the outer surface of the connection between the flange body and the pipe body. The first clamp has a locking block welded to both ends, and a first screw hole is formed on the outer surface of the locking block. The second clamp has a locking seat welded to both ends, and a locking groove adapted to the locking block is formed in the middle of the locking seat. A second screw hole is formed on the outer surface of the locking seat. A fastening screw passes through the middle of the first and second screw holes, and a nut is fitted onto the end of the fastening screw. A first sealing groove is formed at the bottom of the flange body, and a second sealing groove is formed on the outer surface of the pipe body. A sealing ring is filled in the middle of the first and second sealing grooves.
[0009] Using the above technical solution, the first clamp and the second clamp engage, and the fastening screw passes through the screw hole of the clamp block and the clamp seat and is locked with the nut, realizing a quick mechanical connection between the flange body and the pipe body. At the same time, the sealing ring fills the sealing groove of the flange body and the pipe body, and compensates for the micro gaps of the connection surface through elastic deformation, forming a double sealing barrier. The clamp structure improves the efficiency of disassembly and assembly and enhances the resistance to vibration and loosening. The sealing ring and the sealing groove work together to ensure the sealing reliability under high pressure and corrosive conditions, and optimize the convenience and safety of pipeline connection in oil extraction equipment.
[0010] Preferably, both the first clamp and the second clamp have a semi-circular structure, and both the upper and lower end faces of the first clamp and the second clamp have an inwardly convex structure, and both the upper and lower end faces of the first clamp and the second clamp are tightly fitted and connected to the outer surface of the flange body and the pipe body.
[0011] By adopting the above technical solution, the semi-circular structure and inwardly protruding end face design of the first and second clamp components allow them to wrap around the connection part of the flange body and the pipe body through the arc contour, and form a mechanical clamping force by tightly fitting the outer surface through the end face protrusion. The semi-circular structure and the protruding end face work together to expand the contact area between the clamp and the pipe to disperse stress, and prevent media leakage through tight fitting. At the same time, it enhances the overall impact and vibration resistance and improves the connection stability.
[0012] Preferably, the bottom outer surface of the flange body is provided with a plurality of toothed grooves in an annular shape, and the inner walls of the first clamp and the second clamp are fixed with a plurality of toothed blocks that are in contact with the toothed grooves in an annular shape.
[0013] By adopting the above technical solution, the toothed blocks on the inner walls of the first and second clamps form a toothed meshing structure with the toothed grooves at the bottom of the flange body. The mechanical interlocking effect of the tooth meshing restricts axial and circumferential displacement. The mating design of the toothed grooves and toothed blocks significantly enhances the connection strength between the clamp and the flange, effectively preventing the clamp from loosening under high pressure impact or vibration conditions. At the same time, it simplifies disassembly and assembly operations and improves the safety and maintenance efficiency of the pipeline system.
[0014] Preferably, the sealing ring has a concave cross-section, and the outer surface of the sealing ring is in close contact with the inner walls of the first sealing groove and the second sealing groove.
[0015] By adopting the above technical solution, the concave cross-section design of the sealing ring allows it to undergo elastic deformation under pressure. The groove structure can concentrate stress and enhance the contact pressure with the sealing groove, forming a self-tightening sealing effect. The tightly fitting concave ring can effectively compensate for minor unevenness of the flange and pipe body connection surface, improve sealing reliability, reduce the risk of media leakage, and adapt to high pressure, high temperature and corrosive working conditions.
[0016] Preferably, the inner wall of the flange body is provided with a groove, the outer surface of the groove is provided with a plurality of mating grooves, the top end of the pipe body extends with a convex ring, and a mating block is fixed on the outer surface of the convex ring.
[0017] By adopting the above technical solution, the convex ring at the top of the pipe body and the groove on the inner wall of the flange body form a nested fit. At the same time, the engagement of the mating block and the mating groove is used to achieve mechanical positioning, restricting axial and circumferential displacement. The nested structure of the convex ring and the groove enhances the connection strength between the flange and the pipe body, preventing separation under high pressure or vibration conditions. The precise fit between the mating block and the mating groove simplifies the installation and alignment process, improves assembly efficiency, and ensures sealing reliability.
[0018] Preferably, the outer surface of the convex ring is in close contact with the inner wall of the groove, and six sets of docking grooves and docking blocks are provided, with the docking grooves and docking blocks being in a one-to-one corresponding and engaging connection.
[0019] Using the above technical solution, the fit between the convex ring and the groove forms the basic sealing surface. The six sets of one-to-one corresponding mating grooves and mating blocks achieve mechanical interlocking through multi-point engagement, which evenly disperses the connection stress and restricts relative displacement. The six sets of engagement structures significantly improve the tensile and torsional strength of the flange and the pipe body, preventing loosening under high pressure or vibration conditions. The fit between the mating connection and the mechanical interlocking works synergistically to simplify the assembly accuracy requirements, ensure sealing reliability, and extend the service life of the equipment.
[0020] Compared with the prior art, the beneficial effects of this utility model are:
[0021] 1. By installing a first clamp and a second clamp at the connection between the flange body and the pipe body, both of which are semi-circular with their upper and lower ends protruding inward, they tightly fit the flange body and the pipe body, enhancing the wrapping and fit, and providing initial fixation and sealing. The clamp block and the clamp groove cooperate to achieve initial positioning and connection of the clamp. The fastening screw passes through the screw hole and the nut is tightened to firmly clamp the connection, enhance the connection strength, and prevent loosening and leakage. The toothed groove on the outer surface of the bottom end of the flange body mates with the toothed block on the inner wall of the clamp, increasing friction and biting force, preventing the clamp and the flange body from rotating or sliding relative to each other, comprehensively improving the stability and reliability of the union flange connection, and ensuring the safe and efficient operation of oil extraction equipment under complex working conditions.
[0022] 2. A first sealing groove is provided at the bottom of the flange body, which is opposite to a second sealing groove on the outer surface of the pipe body. Together, they form a complete sealing space and are filled with a sealing ring with a concave cross-section. The concave structure allows the sealing ring to fit tightly against the inner wall of the sealing groove due to its own elasticity. When the connection is squeezed, it deforms and increases the contact surface pressure, which can better fill the tiny gaps in the sealing groove. This effectively prevents the medium from leaking from the connection between the flange body and the pipe body during oil extraction, provides reliable sealing protection, and ensures the safe and stable operation of oil extraction equipment. At the same time, this structure also facilitates the installation and replacement of the sealing ring. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the external structure of this utility model from the front view;
[0024] Figure 2 This is a schematic diagram of the main disassembly structure of this utility model;
[0025] Figure 3 This is a schematic diagram of the connection structure of the clamp component of this utility model;
[0026] Figure 4 This is a schematic diagram of the sealing structure of this utility model;
[0027] Figure 5 This is a schematic diagram of the docking structure of this utility model.
[0028] In the diagram: 1. Flange body; 2. Pipe body; 3. Gear groove; 4. First clamp; 5. Second clamp; 6. Gear block; 7. Clamping block; 8. First bolt hole; 9. Clamping seat; 10. Clamping groove; 11. Second bolt hole; 12. Fastening bolt; 13. Nut; 14. First sealing groove; 15. Second sealing groove; 16. Sealing ring; 17. Groove; 18. Butt joint groove; 19. Raised ring; 20. Butt joint block. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0030] Please see Figures 1-5 This utility model provides a technical solution: a union flange for oil extraction equipment, including a flange body 1 and a pipe body 2. The pipe body 2 is connected to the lower part of the flange body 1. A first clamp 4 and a second clamp 5 are sleeved on the outer surface of the connection between the flange body 1 and the pipe body 2. The two ends of the first clamp 4 are welded with clamping blocks 7. The outer surface of the clamping blocks 7 is provided with a first screw hole 8. The two ends of the second clamp 5 are welded with clamping seats 9. The middle part of the clamping seat 9 is provided with a clamping groove 10 that matches the clamping blocks 7. The outer surface of the clamping seat 9 is provided with a second screw hole 11. A fastening screw 12 passes through the middle of the first screw hole 8 and the second screw hole 11. A nut 13 is sleeved at the end of the fastening screw 12. The first clamp 4 and the second clamp 5 are both semi-circular structures, and the upper and lower end faces of the first clamp 4 and the second clamp 5 are both inwardly convex structures. The upper and lower end faces of the first clamp 4 and the second clamp 5 are both tightly fitted and connected to the outer surfaces of the flange body 1 and the pipe body 2. The bottom outer surface of the flange body 1 is provided with a number of toothed grooves 3, and the inner walls of the first clamp 4 and the second clamp 5 are fixed with a number of toothed blocks 6 that are in contact with the toothed grooves 3.
[0031] The flange body 1 is connected to the pipe body 2 below. A first clamp 4 and a second clamp 5, both with a semi-circular structure, are fitted onto the outer surface of the connection point. Their upper and lower end faces are inwardly convex and fit tightly against the outer surfaces of the flange body 1 and the pipe body 2, enhancing the wrapping and fit at the connection point and providing initial fixation and sealing. The clamping blocks 7 welded to both ends of the first clamp 4 can be inserted into the grooves 10 in the middle of the clamping seats 9 at both ends of the second clamp 5, achieving initial positioning and connection of the first clamp 4 and the second clamp 5. The first screw hole 8 on the outer surface of the clamping block 7 corresponds to the second screw hole 11 on the outer surface of the clamping seat 9, allowing the fastening screw 12 to be tightened. After passing through both, the nut 13 is put on and tightened, which can further firmly fix the first clamp 4 and the second clamp 5 together, thereby tightly clamping the connection between the flange body 1 and the pipe body 2, enhancing the connection strength, and preventing loosening and leakage; the several teeth 3 that are circumferentially opened on the outer surface of the bottom end of the flange body 1 are in contact with the several teeth 6 that are circumferentially fixed on the inner wall of the first clamp 4 and the second clamp 5, which can increase the friction and biting force between the clamp and the flange body 1, further preventing relative rotation or sliding between the clamp and the flange body 1, improving the stability and reliability of the entire union flange connection, and ensuring the normal operation of oil extraction equipment under complex working conditions.
[0032] A first sealing groove 14 is provided at the bottom of the flange body 1, and a second sealing groove 15 is provided on the outer surface of the pipe body 2. A sealing ring 16 is filled in the middle of the first sealing groove 14 and the second sealing groove 15. The sealing ring 16 has a concave cross-section, and the outer surface of the sealing ring 16 is in close contact with the inner wall of the first sealing groove 14 and the second sealing groove 15.
[0033] The first sealing groove 14 at the bottom of the flange body 1 and the second sealing groove 15 on the outer surface of the pipe body 2 are positioned opposite each other, together forming a complete sealing space. When the sealing ring 16 with a concave cross-section is filled in, the outer surface of the concave sealing ring 16 will fit tightly against the inner wall of the first sealing groove 14 and the second sealing groove 15 due to its own elasticity. When squeezed at the connection between the flange body 1 and the pipe body 2, the concave structure will deform, increasing the pressure on the contact surface, thereby better filling the tiny gaps in the sealing groove, effectively preventing the medium from leaking from the connection between the flange body 1 and the pipe body 2 during oil extraction, playing a reliable sealing role, ensuring the safe and stable operation of oil extraction equipment, and also facilitating the installation and replacement of the sealing ring 16.
[0034] The inner wall of the flange body 1 has a groove 17, and the outer surface of the groove 17 has several mating grooves 18. The top end of the pipe body 2 extends with a convex ring 19, and a mating block 20 is fixed to the outer surface of the convex ring 19. The outer surface of the convex ring 19 is in close contact with the inner wall of the groove 17, and there are six sets of mating grooves 18 and mating blocks 20. The mating grooves 18 and mating blocks 20 are in a one-to-one corresponding and engaging connection.
[0035] A groove 17 is formed on the inner wall of the flange body 1, and several mating grooves 18 are provided on the outer surface of the groove 17. A convex ring 19 extends from the top of the pipe body 2, and mating blocks 20 are fixed on its outer surface. When connecting the flange body 1 and the pipe body 2, the convex ring 19 of the pipe body 2 is embedded in the groove 17 of the flange body 1 to achieve initial positioning and fitting connection, which plays a certain role in sealing and radial fixing. At the same time, the six sets of mating blocks 20 on the outer surface of the convex ring 19 will engage with the six sets of mating grooves 18 on the outer surface of the groove 17, which can provide a strong mechanical interlocking force, effectively restricting the axial displacement and circumferential rotation between the flange body 1 and the pipe body 2, preventing the connection from loosening due to factors such as vibration and pressure changes during the operation of oil extraction equipment, ensuring the stability and reliability of the connection, and thus ensuring the safe and efficient operation of the entire equipment.
[0036] Working principle: For this type of union flange used in oil extraction equipment, firstly, the convex ring 19 at the top of the pipe body 2 is embedded into the groove 17 on the inner wall of the flange body 1, so that the six sets of mating blocks 20 on the outer surface of the convex ring 19 engage with the six sets of mating grooves 18 on the outer surface of the groove 17, completing the initial positioning and radial fixation; then, the sealing ring 16 with a concave cross-section is placed in the sealing space formed by the first sealing groove 14 at the bottom of the flange body 1 and the second sealing groove 15 on the outer surface of the pipe body 2; subsequently, the first clamp with a semi-circular structure is... 4. The second clamp 5 is fitted onto the outer surface of the connection between the flange body 1 and the pipe body 2, so that the clamping blocks 7 at both ends of the first clamp 4 are inserted into the grooves 10 in the middle of the clamping seats 9 at both ends of the second clamp 5. At the same time, the toothed blocks 6 on the inner walls of the first clamp 4 and the second clamp 5 are aligned with the toothed grooves 3 on the outer surface of the bottom end of the flange body 1. Then, the fastening screw 12 is passed through the first screw hole 8 on the outer surface of the clamping block 7 and the second screw hole 11 on the outer surface of the clamping seat 9. Finally, the nut 13 is put on and tightened to complete the connection and assembly of the entire union flange, ensuring the stable operation of the oil extraction equipment.
[0037] This completes a series of tasks. The contents not described in detail in this specification are existing technologies known to those skilled in the art.
[0038] Although the present invention 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 the present invention should be included within the protection scope of the present invention.
Claims
1. A union flange for oil extraction equipment, comprising a flange body (1) and a pipe body (2), characterized in that: The flange body (1) is connected to a pipe body (2) below. The outer surface of the connection between the flange body (1) and the pipe body (2) is fitted with a first clamp (4) and a second clamp (5). The first clamp (4) has a clamp block (7) welded to both ends. The outer surface of the clamp block (7) is provided with a first screw hole (8). The second clamp (5) has a clamp seat (9) welded to both ends. The middle part of the clamp seat (9) is provided with a clamp groove (10) that matches the clamp block (7). The outer surface of the clamp seat (9) is provided with a second screw hole (11). The middle part of the first screw hole (8) and the second screw hole (11) is provided with a fastening screw (12). The end of the fastening screw (12) is fitted with a nut (13). The bottom of the flange body (1) is provided with a first sealing groove (14). The outer surface of the pipe body (2) is provided with a second sealing groove (15). The middle part of the first sealing groove (14) and the second sealing groove (15) is filled with a sealing rubber ring (16).
2. The union flange for oil extraction equipment according to claim 1, characterized in that: The first clamp (4) and the second clamp (5) are both semi-circular structures, and the upper and lower end faces of the first clamp (4) and the second clamp (5) are both inwardly protruding structures. The upper and lower end faces of the first clamp (4) and the second clamp (5) are both tightly fitted and connected to the outer surfaces of the flange body (1) and the pipe body (2).
3. A union flange for oil extraction equipment according to claim 1, characterized in that: The flange body (1) has a number of toothed grooves (3) circumferentially opened on the outer surface of the bottom end, and the inner walls of the first clamp (4) and the second clamp (5) are fixed with a number of toothed blocks (6) that are in contact with the toothed grooves (3).
4. A union flange for oil extraction equipment according to claim 1, characterized in that: The sealing ring (16) has a concave cross-section, and the outer surface of the sealing ring (16) is in close contact with the inner wall of the first sealing groove (14) and the second sealing groove (15).
5. A union flange for oil extraction equipment according to claim 1, characterized in that: The inner wall of the flange body (1) is provided with a groove (17), and the outer surface of the groove (17) is provided with a plurality of mating grooves (18). The top end of the pipe body (2) extends with a convex ring (19), and a mating block (20) is fixed on the outer surface of the convex ring (19).
6. A union flange for oil extraction equipment according to claim 5, characterized in that: The outer surface of the convex ring (19) is in close contact with the inner wall of the groove (17), and there are six sets of docking grooves (18) and docking blocks (20), and the docking grooves (18) and docking blocks (20) are in a one-to-one corresponding engagement connection.