An anti-loosening flange for high vibration conditions

Abstract

This invention discloses an anti-loosening flange for high-vibration conditions, relating to the field of flange connection technology. The invention creates an annular slot on the metal support frame of the first flange and an annular insert on the metal support frame of the second flange, which mates with the annular slot. This forms a plug-in limiting structure on the two flanges under the axial compression of the connecting bolts and nuts, effectively limiting radial displacement of the first and second flanges under high-vibration conditions. The limiting insert, in conjunction with the limiting groove, restricts circumferential rotational displacement between the first and second flanges, thereby reducing the lateral shear force and torsional load on the connecting bolts, lowering the risk of nut loosening and flange misalignment, and improving overall vibration resistance and anti-loosening performance. By setting a rigid pressure-bearing limiting ring in conjunction with the limiting step, excessive compression of the buffer sealing ring and metal support frame under long-term compression can be avoided.

Description

Technical Field

[0001] This invention relates to the field of flange connection technology, specifically to an anti-loosening flange for high vibration conditions. Background Technology

[0002] Flange connections are a common connection method used in pipelines, valves, pumps, compressors, construction machinery, and industrial equipment. Typically, two flange faces are pressed together using bolts and nuts, with a gasket placed between the two flanges to achieve a fixed connection and seal between the pipeline or equipment interfaces. This type of connection is simple in structure and easy to assemble and disassemble, and is therefore widely used in liquid, gas, and oil conveying equipment.

[0003] However, under high-vibration conditions, ordinary flange connections are easily affected by equipment vibration, pipeline impact, pressure pulsation, and temperature changes. During long-term use, slight radial misalignment or circumferential rotational displacement can easily occur between the two flanges, subjecting the connecting bolts to additional lateral shear forces and torsional loads. This can lead to loosening of the nuts and a decrease in bolt preload, affecting the stability of the flange connection. Furthermore, existing flanges primarily rely on the compression deformation of the gasket for sealing. When the gasket is under constant pressure, rubber, graphite, or spiral wound gaskets are prone to permanent compression deformation, creep, or insufficient rebound, resulting in a reduction in the effective clamping height between the flange faces and a decrease in sealing surface pressure. Especially under vibration and alternating hot and cold environments, problems such as gasket thinning, fretting wear on the end faces, and localized collapse of the contact surface further exacerbate connection loosening and sealing failure. Summary of the Invention

[0004] To address the problems of radial misalignment, rotational displacement, and sealing failure that occur in existing flanges under high vibration conditions, this invention provides an anti-loosening flange for high vibration conditions.

[0005] This invention is achieved through the following technical solution: an anti-loosening flange for high vibration conditions, comprising a first flange, a second flange, connecting bolts and nuts, wherein the connecting bolts pass through the first flange and the second flange, and the nuts are threadedly connected to the connecting bolts so that the first flange and the second flange are pressed together; A rigid pressure-bearing limiting ring is provided between the opposite end faces of the first flange and the second flange. One end surface of each of the two rigid pressure-bearing limiting rings is provided with a metal support frame. An annular slot is provided on the opposite end face of the metal support frame of the first flange. An annular insert is provided on the opposite end face of the metal support frame of the second flange to cooperate with the annular slot. The annular insert is inserted into the annular slot to limit the radial displacement of the first flange and the second flange under vibration conditions. The annular insert is provided with a limiting insert post, and a limiting groove is opened in the metal support frame of the first flange. The limiting insert post is inserted into the limiting groove to limit the circumferential rotational offset between the first flange and the second flange. The bottom of the annular slot is provided with a buffer sealing ring, and both the first flange and the second flange are provided with limit steps.

[0006] Furthermore, one end of the connecting bolt is provided with an external thread one, and the other end of the connecting bolt is provided with an external thread two. The nut is threadedly connected to the external thread one to lock the first flange and the second flange from the outside.

[0007] Furthermore, there are two rigid pressure-bearing limiting rings, which are respectively disposed in the opposite end faces of the first flange and the second flange, and the metal support frame is respectively fixedly disposed on the end surface of the corresponding rigid pressure-bearing limiting ring facing the other rigid pressure-bearing limiting ring.

[0008] Furthermore, the annular slot is continuously arranged along the circumference of the metal support frame located on the first flange side, and the annular insert is continuously arranged along the circumference of the metal support frame located on the second flange side, and both the annular slot and the annular insert are coaxially arranged with the central channel of the first flange and the second flange.

[0009] Furthermore, the groove width of the annular slot is greater than the groove bottom width, and the end width of the annular insert is less than its root width, so that when the annular insert is inserted into the annular slot, a guiding and pressing fit is formed to improve the alignment stability of the first flange and the second flange.

[0010] Furthermore, the number of limiting pins is multiple, and the multiple limiting pins are arranged at intervals along the circumference of the annular insert block. The number of limiting grooves corresponds to the number of limiting pins, and the multiple limiting pins are respectively inserted into the corresponding limiting grooves to improve the circumferential limiting stability between the first flange and the second flange.

[0011] Furthermore, the buffer sealing ring is arranged circumferentially along the bottom of the annular slot, and the end of the annular insert is pressed onto the buffer sealing ring, so that the buffer sealing ring provides elastic buffering and auxiliary sealing at the insertion point of the annular slot and the annular insert.

[0012] Furthermore, the limiting steps are respectively disposed on the first flange and the second flange near the hard pressure limiting ring, and the hard pressure limiting ring abuts against the limiting steps to limit the axial pressing stroke of the first flange and the second flange.

[0013] Furthermore, an inflation groove is provided inside the first or second flange, and the inflation groove is connected to the insertion sealing area between the first and second flanges. A one-way inflation pipe is provided on the inflation groove, and a one-way valve core is provided inside the one-way inflation pipe. A pressure detection interface is provided on the one-way inflation pipe. The one-way inflation pipe is used to fill the inflation groove with inert gas. The pressure detection interface is used to detect the gas pressure change in the inflation groove. A second buffer sealing ring is provided inside the inflation groove. The second buffer sealing ring is used to limit the leakage of inert gas in the inflation groove. A spring is installed inside the inflation groove. The spring keeps the second buffer sealing ring in a compressed state and limits the leakage of inert gas in the inflation groove.

[0014] Furthermore, a bolt guide sleeve is fitted on the outer side of the second external thread. Threaded grooves are provided inside the bolt guide sleeve and the first flange. Threaded pins are threadedly connected to the threaded grooves and are used to limit and fix the bolt guide sleeve.

[0015] The present invention has the following beneficial effects: This anti-loosening flange for high vibration conditions features an annular slot on the metal support frame of the first flange and an annular insert on the metal support frame of the second flange that mates with the annular slot. This creates a plug-in limiting structure between the two flanges under the axial compression of the connecting bolts and nuts. This effectively limits the radial displacement of the first and second flanges under high vibration conditions. At the same time, the limiting insert, in conjunction with the limiting groove, limits the circumferential rotational displacement between the first and second flanges. This reduces the transverse shear force and torsional load on the connecting bolts, lowers the risk of nut loosening and flange misalignment, and improves the overall vibration resistance and anti-loosening performance.

[0016] This anti-loosening flange, designed for high-vibration conditions, limits the axial compression stroke of the first and second flanges by using a rigid pressure-bearing limiting ring and a limiting step. This prevents the buffer sealing ring and metal support frame from being over-compressed under long-term compression, thus reducing problems such as reduced compression height, sealing structure collapse, and preload attenuation. Simultaneously, the combination of the inflation groove, one-way inflation pipe, pressure detection interface, buffer sealing ring two, and spring ensures that buffer sealing ring two remains continuously compressed, facilitating timely detection of sealing leaks and improving the sealing reliability and operational safety of the flange connection.

[0017] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the first and second flanges of the present invention; Figure 2 This is a schematic diagram of the overall structure of the first flange of the present invention; Figure 3 This is a schematic diagram of the overall structure of the second flange of the present invention; Figure 4 This is a schematic diagram of the internal structure of the first flange of the present invention; Figure 5 This is a schematic diagram of the internal structure of the second flange of the present invention; Figure 6 This is a schematic diagram of the external structure of the rigid pressure-bearing limiting ring of the present invention; Figure 7 This is a schematic diagram of the external structure of the connecting bolt of the present invention.

[0019] In the diagram: 1. First flange; 2. Second flange; 3. Connecting bolt; 301. External thread one; 302. External thread two; 4. Nut; 5. Hard pressure-bearing limiting ring; 6. Metal support frame; 7. Annular slot; 8. Annular insert; 9. Limiting insert; 10. Limiting groove; 11. Buffer sealing ring one; 12. Limiting step; 13. Inflation groove; 14. One-way inflation pipe; 15. Pressure detection interface; 16. Buffer sealing ring two; 17. Bolt guide sleeve; 18. Threaded groove; 19. Threaded nail; 20. Spring. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0022] Please see Figures 1-7 The present invention provides a technical solution: an anti-loosening flange for high vibration conditions, including a first flange 1, a second flange 2, a connecting bolt 3 and a nut 4. The connecting bolt 3 passes through the first flange 1 and the second flange 2, and the nut 4 is threadedly connected to the connecting bolt 3 so that the first flange 1 and the second flange 2 are pressed together. A rigid pressure-bearing limiting ring 5 is provided between the opposite end faces of the first flange 1 and the second flange 2. A metal support frame 6 is provided on one end surface of each of the two rigid pressure-bearing limiting rings 5. An annular slot 7 is provided on the opposite end face of the metal support frame 6 of the first flange 1. An annular insert 8 that mates with the annular slot 7 is provided on the opposite end face of the metal support frame 6 of the second flange 2. The annular insert 8 is inserted into the annular slot 7 to limit the radial displacement of the first flange 1 and the second flange 2 under vibration conditions. A limiting pin 9 is provided on the annular insert block 8, and a limiting groove 10 is opened in the metal support frame 6 of the first flange 1. The limiting pin 9 is inserted into the limiting groove 10 to limit the circumferential rotational displacement between the first flange 1 and the second flange 2. The bottom of the annular slot 7 is provided with a buffer sealing ring 11. Both the first flange 1 and the second flange 2 are provided with limiting steps 12. Through the insertion and engagement of the annular slot 7 and the annular insert 8, the first flange 1 and the second flange 2 are not only connected by the bolt preload, but also the radial displacement is limited by the insertion structure. Through the engagement of the limiting insert 9 and the limiting groove 10, the circumferential rotational displacement between the first flange 1 and the second flange 2 can be further limited, thereby improving the flange's anti-dislocation and anti-loosening ability under high vibration conditions. After the hard pressure limiting ring 5 and the limiting step 12 are engaged, the axial compression stroke of the two flanges can be limited, avoiding excessive compression of the sealing structure.

[0023] One end of the connecting bolt 3 has an external thread 301 on its outer circumference, and the other end of the connecting bolt 3 has an external thread 302 on its outer circumference. The nut 4 is threadedly connected to the external thread 301 to lock the first flange 1 and the second flange 2 from the outside. This allows the nut 4 to clamp the first flange 1 and the second flange 2 from both sides, thereby forming a stable axial preload. The locking method at both ends helps to improve the uniformity of the force on the flange connection and reduces the risk of bolt loosening due to concentrated force on one side.

[0024] Two rigid pressure-bearing limiting rings 5 ​​are respectively disposed in the opposite end faces of the first flange 1 and the second flange 2. The metal support frame 6 is respectively fixedly disposed on the end surface of the corresponding rigid pressure-bearing limiting ring 5 facing the other rigid pressure-bearing limiting ring 5. The rigid pressure-bearing limiting rings 5 ​​are used to bear part of the axial compression load. When the first flange 1 and the second flange 2 are pressed by the connecting bolts 3, the rigid pressure-bearing limiting rings 5 ​​can form an abutment limit with the limiting step 12 to prevent the first flange 1 and the second flange 2 from continuing to approach each other, avoid excessive compression of the buffer sealing ring 11 and the metal support frame 6, and reduce the problem of preload reduction caused by permanent deformation of the sealing structure.

[0025] The annular slot 7 is continuously arranged circumferentially along the metal support frame 6 located on the side of the first flange 1, and the annular insert 8 is continuously arranged circumferentially along the metal support frame 6 located on the side of the second flange 2. Both the annular slot 7 and the annular insert 8 are coaxially arranged with the central channel of the first flange 1 and the second flange 2. The annular slot 7 and the annular insert 8 adopt a circumferential continuous structure, which can form a uniform insertion and limiting effect in the circumferential direction of the flange. Since they are coaxially arranged with the central channel, they can play a guiding and centering role during assembly, so that the central channels of the first flange 1 and the second flange 2 remain coaxial, reducing uneven force on the sealing surface and local wear caused by eccentric assembly.

[0026] The groove width of the annular slot 7 is greater than the groove bottom width, and the end width of the annular insert 8 is less than its root width. This allows the annular insert 8 to form a guiding and pressing fit when inserted into the annular slot 7, thereby improving the alignment stability of the first flange 1 and the second flange 2. The annular slot 7 and the annular insert 8 form a similar tapered guiding insertion relationship. During assembly, the annular insert 8 can easily enter the annular slot 7 and gradually form a stable fit as the first flange 1 and the second flange 2 are axially pressed together. This improves the assembly guidance and resistance to radial offset, and also reduces the looseness between the annular insert 8 and the annular slot 7 under vibration conditions.

[0027] The number of limiting pins 9 is multiple, and the multiple limiting pins 9 are arranged at intervals along the circumference of the annular insert block 8. The number of limiting grooves 10 corresponds to the number of limiting pins 9. The multiple limiting pins 9 are respectively inserted into the corresponding limiting grooves 10 to improve the circumferential limiting stability between the first flange 1 and the second flange 2. It can form multi-point limiting in the circumferential direction, avoid the force concentration of single-point limiting. Under high vibration conditions, the cooperation between the limiting pins 9 and the limiting grooves 10 can share the circumferential impact load and limit the relative rotation of the first flange 1 and the second flange 2, thereby reducing the risk of loosening of the connecting bolts 3 due to torsion and shear.

[0028] The buffer sealing ring 11 is arranged circumferentially along the bottom of the annular slot 7. The end of the annular insert 8 is pressed against the buffer sealing ring 11, so that the buffer sealing ring 11 provides elastic buffering and auxiliary sealing for the insertion point of the annular slot 7 and the annular insert 8. The limiting steps 12 are respectively arranged at the positions of the first flange 1 and the second flange 2 near the hard pressure limiting ring 5. The hard pressure limiting ring 5 abuts against the limiting steps 12 to limit the axial pressing stroke of the first flange 1 and the second flange 2. It can form multi-point limiting in the circumferential direction, avoiding the concentration of force at a single point of limiting. Under high vibration conditions, the cooperation between the limiting insert 9 and the limiting groove 10 can share the circumferential impact load and limit the relative rotation of the first flange 1 and the second flange 2, thereby reducing the risk of loosening of the connecting bolt 3 due to torsion and shear.

[0029] An inflation groove 13 is provided inside the first flange 1 or the second flange 2. The inflation groove 13 is connected to the insertion sealing area between the first flange 1 and the second flange 2. A one-way inflation pipe 14 is provided on the inflation groove 13. A one-way valve core is provided inside the one-way inflation pipe 14. A pressure detection interface 15 is provided on the one-way inflation pipe 14. The one-way inflation pipe 14 is used to fill the inflation groove 13 with inert gas. The pressure detection interface 15 is used to detect the gas pressure change in the inflation groove 13. A second buffer sealing ring 16 is provided inside the inflation groove 13. The second buffer sealing ring 16 is used to limit the leakage of inert gas in the inflation groove 13. A spring 20 is installed inside the inflation groove 13. The spring 20 keeps the second buffer sealing ring 16 in a compressed state and limits the leakage of inert gas in the inflation groove 13. The inflation groove 13 is used to form an inert gas auxiliary cavity in the insertion sealing area between the first flange 1 and the second flange 2. After inert gases such as nitrogen or argon are filled into the gas filling tank 13 through the one-way gas filling pipe 14, a gas isolation layer can be formed in the plug-in sealing area. When a slight leak occurs in the inner or outer seal, the gas auxiliary chamber can play a leak warning role, thereby improving the sealing reliability of the flange connection.

[0030] A bolt guide sleeve 17 is fitted on the outer side of the external thread 302. Threaded grooves 18 are provided inside both the bolt guide sleeve 17 and the first flange 1. Threaded pins 19 are threaded into the threaded grooves 18. The threaded pins 19 are used to limit and fix the bolt guide sleeve 17. The bolt guide sleeve 17 is used to radially limit and guide the connecting bolt 3, reducing the sway or movement of the connecting bolt 3 relative to the flange bolt hole. The threaded pins 19 limit and fix the bolt guide sleeve 17 through the threaded grooves 18, preventing the bolt guide sleeve 17 from falling off or shifting in a high-vibration environment. This structure can reduce the impact wear between the connecting bolt 3 and the bolt hole wall, and improve the installation stability of the connecting bolt 3.

[0031] The specific workflow of this invention is as follows: First, the first flange 1 and the second flange 2 are installed to correspond to the ends of the pipelines or equipment interfaces to be connected, so that the central channels of the first flange 1 and the second flange 2 are kept coaxial. Then, the rigid pressure-bearing limiting rings 5 ​​set between the opposite end faces of the first flange 1 and the second flange 2 are placed in the corresponding installation positions, so that the rigid pressure-bearing limiting rings 5 ​​correspond to and cooperate with the limiting steps 12 in the first flange 1 and the second flange 2, and at the same time, the metal support frames 6 on the opposite end faces of the two rigid pressure-bearing limiting rings 5 ​​are brought closer to each other.

[0032] During the docking process between the first flange 1 and the second flange 2, the annular insert 8 on the metal support frame 6 on the side of the second flange 2 is gradually inserted into the annular slot 7 on the metal support frame 6 on the side of the first flange 1. The annular slot 7 and the annular insert 8 form an annular insertion fit, which restricts the first flange 1 and the second flange 2 in the radial direction, preventing the two flanges from being misaligned vertically or radially offset under high vibration conditions. At the same time, the limiting pin 9 on the annular insert 8 is inserted into the limiting groove 10 opened in the metal support frame 6 on the side of the first flange 1. The fit between the limiting pin 9 and the limiting groove 10 restricts the circumferential relative rotation between the first flange 1 and the second flange 2, thereby preventing the first flange 1 and the second flange 2 from rotating and shifting under vibration.

[0033] As the annular insert 8 continues to be inserted into the annular slot 7, the end of the annular insert 8 presses against the buffer sealing ring 11 at the bottom of the annular slot 7. The buffer sealing ring 11 undergoes elastic deformation after being compressed, which on the one hand provides auxiliary sealing for the insertion part of the annular insert 8 and the annular slot 7, and on the other hand absorbs the impact generated when the two flanges are joined, reducing the rigid collision and vibration wear between the metal support frame 6. As the first flange 1 and the second flange 2 continue to approach each other, the rigid pressure limiting ring 5 and the limiting step 12 form an abutment limit, which is used to limit the axial pressing stroke of the first flange 1 and the second flange 2, and avoid the buffer sealing ring 11 and the metal support frame 6 being over-compressed, thereby maintaining the stable pressing height at the connection between the first flange 1 and the second flange 2.

[0034] After the first flange 1 and the second flange 2 are aligned and positioned, the connecting bolt 3 is passed through the first flange 1 and the second flange 2. The external thread 301 at one end of the connecting bolt 3 is threaded to the corresponding nut 4. By tightening the nut 4, the first flange 1 and the second flange 2 are generated with axial preload. This preload keeps the annular insert 8 stably in the annular slot 7, keeps the limiting insert 9 stably in the limiting groove 10, and keeps the buffer sealing ring 11 in a compressed sealing state. At the same time, the hard pressure-bearing limiting ring 5 bears part of the axial compressive load, reducing the collapse or wear of the flange end face under long-term vibration.

[0035] During the installation of the connecting bolt 3, the bolt guide sleeve 17 is fitted on the side of the connecting bolt 3 near the external thread 302 to guide and support the connecting bolt 3, reducing the radial sway of the connecting bolt 3 under high vibration conditions. The bolt guide sleeve 17 and the first flange 1 have corresponding threaded grooves 18, and the threaded pin 19 is threaded into the threaded groove 18, so that the bolt guide sleeve 17 is limited and fixed, preventing the bolt guide sleeve 17 from loosening or falling out during vibration.

[0036] After the flange connection is completed, inert gas is injected into the inflation groove 13 through the one-way inflation pipe 14. The inert gas is preferably nitrogen. The inflation groove 13 is connected to the insertion sealing area between the first flange 1 and the second flange 2. After the inert gas enters the inflation groove 13, a gas isolation layer is formed in the insertion sealing area. The second buffer sealing ring 16 is set in the inflation groove 13 to limit the leakage of inert gas in the inflation groove 13. The spring 20 presses against the second buffer sealing ring 16 to keep the second buffer sealing ring 16 in a compressed state, so that the sealing effect can still be maintained when the second buffer sealing ring 16 is slightly compressed and deformed due to vibration or temperature change.

[0037] During equipment operation, when the first flange 1 and the second flange 2 are subjected to high-frequency vibration or impact loads, the insertion and engagement of the annular slot 7 and the annular insert 8 can limit the radial displacement of the two flanges, and the engagement of the limiting insert 9 and the limiting groove 10 can limit the circumferential rotational displacement of the two flanges, thereby reducing the lateral shear force borne by the connecting bolt 3 and reducing the risk of the nut 4 loosening. The hard pressure-bearing limiting ring 5 and the limiting step 12 can maintain the axial compression height of the flange connection, avoiding the rapid decay of the connection preload due to end face wear, permanent deformation of the sealing ring, or collapse of the contact surface. The buffer sealing ring 11 and the buffer sealing ring 26 provide elastic sealing to the insertion area and the inflation groove 13, respectively, while the spring 20 provides continuous compensation pressure to the buffer sealing ring 216, improving the stability of the inert gas assisted sealing structure.

[0038] During long-term operation, the pressure detection interface 15 is used to detect changes in gas pressure within the inflation tank 13. When a leak occurs in the plug-in sealing area or the buffer sealing ring, the gas pressure within the inflation tank 13 will change. Operators can promptly determine the sealing status of the flange connection through the pressure detection interface 15. When a pressure drop is detected, inert gas can be replenished to the inflation tank 13 again through the one-way inflation pipe 14, so that a stable inert gas isolation environment can be re-established within the inflation tank 13.

Claims

1. An anti-loosening flange for high vibration conditions, characterized in that, It includes a first flange (1), a second flange (2), a connecting bolt (3) and a nut (4). The connecting bolt (3) passes through the first flange (1) and the second flange (2). The nut (4) is threadedly connected to the connecting bolt (3) so that the first flange (1) and the second flange (2) are pressed together. A rigid pressure-bearing limiting ring (5) is provided between the opposite end faces of the first flange (1) and the second flange (2). A metal support frame (6) is provided on one end surface of each of the two rigid pressure-bearing limiting rings (5). An annular slot (7) is provided on the opposite end face of the metal support frame (6) of the first flange (1). An annular insert (8) that mates with the annular slot (7) is provided on the opposite end face of the metal support frame (6) of the second flange (2). The annular insert (8) is inserted into the annular slot (7) to limit the radial displacement of the first flange (1) and the second flange (2) under vibration conditions. The annular insert (8) is provided with a limiting insert post (9), and a limiting groove (10) is opened in the metal support frame (6) of the first flange (1). The limiting insert post (9) is inserted into the limiting groove (10) to limit the circumferential rotational offset between the first flange (1) and the second flange (2). The bottom of the annular slot (7) is provided with a buffer sealing ring (11), and the first flange (1) and the second flange (2) are both provided with limit steps (12).

2. The anti-loosening flange for high vibration conditions according to claim 1, characterized in that: One end of the connecting bolt (3) is provided with an external thread one (301) on its outer periphery, and the other end of the connecting bolt (3) is provided with an external thread two (302) on its outer periphery. The nut (4) is threadedly connected to the external thread one (301) to lock the first flange (1) and the second flange (2) from the outside.

3. The anti-loosening flange for high vibration conditions according to claim 1, characterized in that: There are two rigid pressure-bearing limiting rings (5). The two rigid pressure-bearing limiting rings (5) are respectively disposed in the opposite end faces of the first flange (1) and the second flange (2). The metal support frame (6) is respectively fixedly disposed on one end surface of the corresponding rigid pressure-bearing limiting ring (5) facing the other rigid pressure-bearing limiting ring (5).

4. The anti-loosening flange for high vibration conditions according to claim 1, characterized in that: The annular slot (7) is continuously arranged along the circumference of the metal support frame (6) located on the side of the first flange (1), and the annular insert (8) is continuously arranged along the circumference of the metal support frame (6) located on the side of the second flange (2). Both the annular slot (7) and the annular insert (8) are coaxially arranged with the central channel of the first flange (1) and the second flange (2).

5. The anti-loosening flange for high vibration conditions according to claim 1, characterized in that: The groove width of the annular slot (7) is greater than the groove bottom width, and the end width of the annular insert (8) is less than its root width, so that when the annular insert (8) is inserted into the annular slot (7), a guiding and pressing fit is formed to improve the alignment stability of the first flange (1) and the second flange (2).

6. The anti-loosening flange for high vibration conditions according to claim 1, characterized in that: The number of the limiting pins (9) is multiple, and the multiple limiting pins (9) are arranged at intervals along the circumference of the annular insert (8). The number of the limiting grooves (10) corresponds to the number of the limiting pins (9). The multiple limiting pins (9) are respectively inserted into the corresponding limiting grooves (10) to improve the circumferential limiting stability between the first flange (1) and the second flange (2).

7. The anti-loosening flange for high vibration conditions according to claim 1, characterized in that: The buffer sealing ring (11) is arranged circumferentially along the bottom of the annular slot (7), and the end of the annular plug (8) is pressed onto the buffer sealing ring (11), so that the buffer sealing ring (11) provides elastic buffering and auxiliary sealing at the insertion point of the annular slot (7) and the annular plug (8).

8. The anti-loosening flange for high vibration conditions according to claim 1, characterized in that: The limiting steps (12) are respectively set at the positions of the first flange (1) and the second flange (2) near the hard pressure limiting ring (5). The hard pressure limiting ring (5) abuts against the limiting steps (12) to limit the axial pressing stroke of the first flange (1) and the second flange (2).

9. The anti-loosening flange for high vibration conditions according to claim 1, characterized in that: An inflation groove (13) is provided in the first flange (1) or the second flange (2). The inflation groove (13) is connected to the insertion sealing area between the first flange (1) and the second flange (2). A one-way inflation pipe (14) is provided on the inflation groove (13). A one-way valve core is provided in the one-way inflation pipe (14). A pressure detection interface (15) is provided on the one-way inflation pipe (14). The one-way inflation pipe (14) is used to inflate the inflation groove (13) with air. Inert gas, the pressure detection interface (15) is used to detect the gas pressure change in the inflation tank (13), the inflation tank (13) is provided with a second buffer sealing ring (16), the second buffer sealing ring (16) is used to limit the leakage of inert gas in the inflation tank (13), the inflation tank (13) is installed with a spring (20), the spring (20) keeps the second buffer sealing ring (16) in a compressed state and limits the leakage of inert gas in the inflation tank (13).

10. The anti-loosening flange for high vibration conditions according to claim 2, characterized in that: A bolt guide sleeve (17) is fitted on the outer side of the external thread (302). Threaded grooves (18) are provided inside the bolt guide sleeve (17) and the first flange (1). Threaded pins (19) are threaded into the threaded grooves (18). Threaded pins (19) are used to limit and fix the bolt guide sleeve (17).

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