A pressure-sealed leak-proof fixture for pressure-bearing equipment flange and its preparation method

Abstract

The present application relates to the technical field of pressure-sealing plugging in pressure-bearing equipment, and specifically provides a pressure-sealing plugging fixture for the flange of pressure-bearing equipment and a preparation method thereof. The pressure-sealing plugging fixture includes a first fixture and a second fixture which are detachably connected to the flange gap and the cylindrical surface and are an integrally formed elastic deformation structure; the first fixture and the second fixture both include: a fixture body, a fixture boss and a fixture bevel. When the first fixture and the second fixture are installed and fastened on the flange, the fixture bevel is elastically expanded and deformed by force, forming a circumferential interference contact with the cylindrical surface, generating an axial component force acting on the side surface of the flange, causing the flange gap to elastically deform and shrink along the axial distance, and the reaction force generated thereby presses the boss against the flange gap surface in the direction of the flange gap, and the fixture boss forms an installation interference fit with the side surface of the flange gap to achieve sealing of the flange gap to form a sealed cavity, and then glue is injected to achieve pressure sealing of the flange of the pressure-bearing equipment.

Description

Technical Field

[0001] The present application relates to the technical field of pressure-bearing equipment under pressure plugging, and in particular to a pressure-bearing equipment flange under pressure plugging fixture and a preparation method thereof. Background Art

[0002] During the long-term operation of pressure-bearing equipment (such as pressure pipes, pressure vessels, and boiler interfaces), flange connections are prone to leakage due to factors such as medium corrosion, gasket aging, assembly errors, and temperature and pressure fluctuations. There are usually two traditional treatment methods: one is to replace the flange gasket under the condition of temporarily suspending production; the other is to use pressure sealing (also known as pressure plugging) technology to implement online treatment without stopping the machine (without stopping production line production).

[0003] Existing pressurized seals often use an injection-type flange clamp design, but there are many problems: First, the clamp ear plate and the main body are often welded, and there is no effective way to detect the quality of the welds, which poses a potential safety hazard; second, the concentricity and parallelism of the flange installation are very demanding, and processing and measurement errors cause the sealant to easily overflow from the contact surface between the clamp and the flange; third, the sealing material undergoes thermal weight loss due to temperature changes, and long-term glue filling is required to maintain the seal, which increases both operational risks and maintenance costs.

[0004] Therefore, the existing technology has defects and deficiencies and needs further improvement and development. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the purpose of this application is to provide a pressurized leak-proof clamp for the flange of pressure-bearing equipment, aiming to solve the problem that the existing pressurized leak-proof clamp for the flange of pressure-bearing equipment is prone to leakage during glue injection and sealing.

[0006] The technical solution adopted by the present application to solve the technical problem is as follows: a pressure-sealing fixture for a flange of a pressure-bearing equipment, wherein the flange of the pressure-bearing equipment includes two flanges arranged relative to each other to form a flange gap and a cylindrical surface surrounding the outer circumference of the flanges, wherein the pressure-sealing fixture includes:

[0007] A first clamp and a second clamp detachably connected to the flange gap and the cylindrical surface, wherein the first clamp and the second clamp are both integrally formed elastic deformation structures;

[0008] The first fixture and the second fixture both include:

[0009] A fixture body, wherein at least one injection valve is evenly spaced apart and the fixture body has a sealing end facing the flange gap;

[0010] A clamp boss, the clamp boss is arranged on the sealing end and is used to be embedded in the flange gap;

[0011] a fixture bevel, the fixture bevel being disposed at the sealing end and being disposed at an angle to the fixture boss, the fixture bevel having an initial inner diameter that is smaller than an outer diameter of the cylindrical surface;

[0012] Among them, when the first clamp and the second clamp are installed and fastened on the flange, the clamp bevel is elastically expanded and deformed under force, forming a circumferential interference contact with the cylindrical surface, and the reaction force generated thereby pushes the boss tightly against the flange gap surface along the flange gap direction, and the clamp boss and the side surface of the flange gap form an installation interference fit to form a sealed cavity. The clamp body and the clamp boss are both provided with injection channels corresponding to the injection valve, which are used to inject sealant into the sealed cavity formed between the clamp and the flange.

[0013] Optionally, the radial extension length of the clamp bevel is smaller than the radial extension length of the clamp boss.

[0014] Optionally, the angle between the clamp bevel and the clamp boss ranges from 5° to 45°; when the clamp bevel forms circumferential interference contact with the cylindrical surface, the clamp bevel and the cylindrical surface are set at an angle of 25° to 40°.

[0015] Optionally, the end of the clamp's hypotenuse facing away from the clamp body is configured as an arc cross section or a beveled cross section.

[0016] Optionally, the thickness of the clamp boss is set to 0.98-1.02 times the minimum axial dimension of the flange gap.

[0017] Optionally, the sealing end is provided with a first bevel and a second bevel, the clamp boss is provided at the junction of the first bevel and the second bevel, and the angle between the clamp boss and the first bevel is smaller than the angle between the clamp boss and the second bevel, and a boss reinforcement rib is provided at the junction of the first bevel and the clamp boss.

[0018] Optionally, the clamp bevel is arranged on the first inclined surface, and the clamp bevel and the first inclined surface have a bevel angle close to the clamp boss, and a bevel reinforcement rib is provided at the bevel angle.

[0019] Optionally, the clamp body is provided with a lifting lug on its outer circumferential surface away from the clamp boss, the lifting lug is located at both ends of the clamp body along the circumferential direction, a connecting structure is provided on the lifting lug, and the first clamp and the second clamp are fixedly connected via the lifting lug.

[0020] Optionally, the glue injection channel is configured to be in a straight or L shape.

[0021] The technical solution adopted by the present application to solve the technical problem is as follows: A method for preparing the above-mentioned pressure plugging fixture comprises the following steps:

[0022] According to the outer diameter of the pressure equipment flange, the flange clearance and the operating parameters, determine the angle range between the fixture bevel and the fixture boss, and select the design parameters in which the initial inner diameter is smaller than the flange outer diameter;

[0023] The material is integrally machined and formed, and the fixture body, sealing end, fixture boss and fixture bevel are processed on the same blank by CNC cutting or precision milling;

[0024] At least one injection valve and a glue injection channel connected thereto are evenly spaced on the fixture body, and the glue injection channel is processed into a straight or L-shape as needed;

[0025] Performing surface polishing and heat treatment on the machined fixture body;

[0026] The processed clamp body is split into a first clamp and a second clamp, and a connection structure is reserved at the position of the lifting lug to achieve a detachable connection between the first clamp and the second clamp during use, thereby obtaining a pressure-sealing clamp.

[0027] Beneficial effects:

[0028] The present application provides a pressure-sealing clamp for the flange of pressure-bearing equipment and a preparation method thereof. The pressure-sealing clamp is provided with an integral elastic deformation structure (a first clamp and a second clamp) which is integrally machined and formed on the outer periphery of the flange of the pressure-bearing equipment, so that after the clamp bevel, the first clamp and the second clamp are installed and tightened, the clamp bevel is elastically expanded under force, forming a circumferential interference contact with the cylindrical surface of the flange, thereby obtaining a continuous and uniform sealing pressure ratio without strictly relying on the concentricity and parallelism of the flange; at the same time, the clamp boss is subjected to the pressure of the pressure-bearing equipment flange on the clamp bevel. Under the action of the reaction force, at least one surface of the flange gap (the surface away from the bevel of the fixture) is closely attached to the flange gap along the direction of the flange gap, and the fixture boss and the side surface of the flange gap form an interference fit for installation, which effectively prevents the sealant from overflowing and reduces the impact of processing and measurement errors on the sealing effect. On this basis, the one-piece molding structure without welding avoids the difficulties in detecting the welds of the pressurized leak-proof fixture and potential quality risks. In actual use, the frequency of glue filling can be reduced by selecting a suitable sealant, thereby maintaining long-term stable sealing performance in high temperature, high pressure and hazardous media environments. This structural improvement not only improves the safety and reliability of the pressurized sealing of the flange of pressure-bearing equipment, but also reduces personnel operation risks and maintenance costs, as well as the economic losses caused by frequent maintenance and production stoppages, and has both significant safety benefits and social value. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the three-dimensional matching relationship between the pressure plugging fixture and the flange of the pressure-bearing equipment in the preferred embodiment provided in this application;

[0030] Figure 2 It is a partial three-dimensional cross-sectional schematic diagram of the matching relationship between the pressure plugging fixture and the flange of the pressure-bearing equipment in the preferred embodiment provided in this application;

[0031] Figure 3 This is a schematic diagram of the three-dimensional structure of the pressure plugging fixture in the preferred embodiment provided in this application;

[0032] Figure 4 1 is a schematic cross-sectional view of the pressurized leak-sealing fixture in the preferred embodiment provided in the present application along the radial direction;

[0033] Figure 5 This application provides Figure 4 A in the middle is an enlarged schematic diagram;

[0034] Figure 6 This is a schematic radial cross-sectional view of the matching relationship between the pressure plugging fixture and the flange of the pressure-bearing equipment in the preferred embodiment provided in this application;

[0035] Figure 7 This application provides Figure 6 The enlarged schematic diagram of point B in the middle;

[0036] Figure 8 This application provides Figure 5 A schematic diagram of a preferred deformation structure;

[0037] Figure 9 It is a partial cross-sectional schematic diagram along the radial direction of the matching relationship between the pressurized leak-proof fixture and the flange of the pressure-bearing equipment in the preferred embodiment provided in this application;

[0038] Figure 10 It is another partial cross-sectional schematic diagram along the radial direction of the matching relationship between the pressurized leak-proof fixture and the flange of the pressure-bearing equipment in the preferred embodiment provided in this application.

[0039] Description of reference numerals:

[0040] 10. Pressure plugging fixture; 20. Pressure equipment flange; 30. Sealing cavity; 21. Flange gap; 22. Cylindrical surface; 211. First side surface; 212. Sealing surface; 213. Second side surface; 31. First sealing cavity; 32. Second sealing cavity; 11. First fixture; 12. Second fixture; 13. Fixture body; 14. Fixture boss; 15. Fixture bevel; 16. Injection valve; 17. Glue injection channel; 19. Lifting ear; 131. Sealing end; 132. First bevel; 133. Second bevel; 134. Boss reinforcement rib; 135. Bevel reinforcement rib; 191. Connection structure. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions and advantages of this application clearer and more explicit, the following further describes this application in detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to explain this application and are not intended to limit this application.

[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0044] Please refer to Figures 1 to 7In the first embodiment of the present application, a pressure-sealing clamp 10 for a pressure-bearing equipment flange 20 is provided. The pressure-bearing equipment flange 20 is generally used for the connection of pipelines. The pressure-bearing equipment flange 20 includes two flanges relatively arranged to form a flange gap 21 and a cylindrical surface 22 surrounding the outer circumference of the flange; wherein, the pressure-sealing clamp 10 refers to a clamp used when implementing online treatment of leakage of the pressure-bearing equipment flange 20 without stopping the machine (without stopping the production line) by adopting pressure sealing (also known as pressure sealing) technology.

[0045] The pressure plugging clamp 10 includes a first clamp 11 and a second clamp 12, which are detachably connected to the flange gap 21 and the cylindrical surface 22. The first clamp 11 and the second clamp 12 are both one-piece elastic deformation structures. When the first clamp 11 and the second clamp 12 are connected together, they are sealed on the pressure equipment flange 20. The shape of the first clamp 11 and the second clamp 12 after being connected together is determined according to the shape of the pressure equipment flange 20, including but not limited to a circular sealing structure, a square sealing structure or an irregular sealing structure.

[0046] The first clamp 11 and the second clamp 12 both include a clamp body 13, a clamp boss 14 and a clamp bevel 15, and at least one injection valve 16 is evenly spaced on the clamp body 13, through which the clamp body 13 can be injected with a sealing end 131 facing the flange gap 21; the clamp boss 14 is arranged on the sealing end 131, and the clamp boss 14 is used to be embedded in the flange gap 21; the clamp bevel 15 is arranged at the sealing end 131 and is arranged at an angle to the clamp boss 14, and the clamp bevel 15 has an initial inner diameter, and the initial inner diameter is smaller than the outer diameter of the cylindrical surface 22; wherein, when the first clamp 11 and the second clamp 12 are installed and tightened When on the flange, the clamp bevel 15 is elastically expanded and deformed by the force, forming a circumferential interference contact with the cylindrical surface 22, and the reaction force generated thereby pushes the boss tightly against the flange gap surface along the direction of the flange gap 21. The clamp boss 14 forms an installation interference fit with the side surface of the flange gap 21, generating an axial component force acting on the flange side surface (the first side surface and the second side surface), so that the flange gap is elastically deformed and miniaturized along the axial distance, thereby achieving sealing of the flange gap 21 to form a sealed cavity 30. The clamp body 13 and the clamp boss 14 are both provided with a glue injection channel 17 corresponding to the injection valve 16, which is used to inject the sealant into the sealed cavity 30 formed between the clamp and the flange.

[0047] That is, in existing technologies, flange connections in long-term pressure-bearing equipment (such as pressure pipes, pressure vessels, and boiler interfaces) are prone to leakage due to factors such as medium corrosion, gasket aging, installation errors, and thermal fluctuations. To overcome the problems of existing pressurized sealing technologies, which require strict flange concentricity and parallelism, pose welding quality risks, and require frequent glue repair and maintenance, this embodiment utilizes a pressurized leak-proof fixture 10 with an integrally molded elastic deformation structure. The first fixture 11 and the second fixture 12, manufactured by integral machining, are detachably connected to the outer periphery of the flange, thereby achieving efficient, continuous, and stable sealing without shutting down the machine.

[0048] The clamp body 13 of the pressurized leak-proof clamp 10 is provided with a clamp boss 14 at the sealing end 131, and the clamp boss 14 is embedded in the flange gap 21; a clamp bevel 15 is provided near the clamp boss 14, and the initial inner diameter of the bevel is slightly smaller than the outer diameter of the cylindrical surface 22. During installation and tightening, the clamp bevel 15 is subjected to force in the circumferential direction (circumferential direction) to produce elastic expansion and form a continuous line contact with the flange, thereby improving the sealing reliability. At the same time, the clamp boss 14 is tightly attached to the surface of the flange gap 21 under the reaction force of the bevel, effectively preventing the sealant from overflowing and reducing the dependence on installation accuracy. The first clamp 11 and the second clamp 12 do not need to be welded to the clamp body 13, fundamentally eliminating the hidden dangers of weld quality, improving the inherent safety and service life of the equipment; and the sealant can be injected into the sealing cavity 30 by providing an injection valve 16 and a connected glue injection channel 17 on the clamp body 13, reducing the need for long-term glue filling, reducing maintenance costs and operating risks.

[0049] Ultimately, the pressurized leak-proofing fixture 10 provided in this embodiment achieves long-term, intrinsically safe sealing in high-temperature, high-pressure, and corrosive media environments, reduces seal failures caused by installation errors, adapts to installation errors, reduces machining precision requirements, and maintains stable operation without requiring production downtime for maintenance, thereby improving economic benefits and production efficiency. With its one-piece elastic deformation design, circumferential interference contact seal, lack of welding hazards, and optimized injection path, the pressurized leak-proofing fixture 10 significantly improves the reliability and practical value of pressurized sealing of flanges 20 in pressure-bearing equipment.

[0050] In some embodiments, the flange gap 21 includes a first side surface 211, a sealing surface 212, and a second side surface 213 in sequence. When the pressure-sealing clamp 10 is installed on the pressure-bearing equipment flange 20, the clamp bevel 15 is subjected to a tightening force in the circumferential direction and elastically expands, thereby forming a continuous line contact with the flange cylindrical surface 22, thereby improving the sealing reliability. At the same time, the clamp boss 14 is more closely attached to the first side surface 211 under the reaction force of the clamp bevel 15, so that the sealing ratio between the clamp boss 14 and the first side surface 211 is higher than the sealing ratio between the clamp boss 14 and the second side surface 213. When there is a local spacing in the circumferential direction of the flange gap 21 that is greater than the axial dimension of the clamp boss 14, the sealant will only leak from the lower sealing ratio between the clamp boss 14 and the second side surface 213. However, because the fixture's beveled edge 15 forms a circumferential interference seal, any sealant leaking from this location remains confined within the sealed cavity 30 and prevents it from spreading outward, thus preventing secondary leakage. This design effectively ensures long-term sealing reliability and safety when dealing with local installation errors, thermal deformation, or dimensional non-uniformity.

[0051] It should be noted that the pressure-sealing clamp 10 can also include multiple clamps, for example, the pressure-sealing clamp 10 includes a first clamp 11, a second clamp 12 and a third clamp; or the pressure-sealing clamp 10 includes a first clamp 11, a second clamp 12, a third clamp...the Nth clamp, where N is an integer greater than or equal to 4, and thus pressure-bearing equipment flanges 20 with different external structures can be used. The number of clamps and the size of each clamp can also be set according to the on-site space, which not only facilitates installation but also improves the scope of application of the pressure-sealing clamp 10.

[0052] In some embodiments, the radial extension length of the clamp bevel 15 is smaller than the radial extension length of the clamp boss 14, thereby avoiding interference between the clamp bevel 15 and the clamp boss 14 when the clamp boss 14 is embedded in the flange gap 21, ensuring that the clamp boss 14 has a sufficient embedding amount and the sealing effect of the clamp boss 14 on the flange gap 21; at the same time, after the clamp boss 14 is embedded in the flange gap 21, it can be more stably pressed against the surface of the flange gap 21, so that the clamp boss 14 forms a relatively rigid and more reliable positioning and sealing reference. At this time, the bevel edge 15 of the clamp forms a radial extension slightly smaller than the radial extension of the clamp boss 14 in the radial direction of the cylindrical surface 22, so that the bevel edge 15 of the clamp elastically expands and deforms under force, and when it achieves circumferential interference contact with the cylindrical surface 22 of the flange, it can more sensitively elastically make concessions and fit along the stable reference position determined by the clamp boss 14, thereby effectively reducing the stringent requirements on the flange installation accuracy. Even if the flange has a certain eccentricity or parallelism error, the bevel edge 15 of the clamp can still achieve flexible fit under the stable reference provided by the clamp boss 14, thereby further improving the sealing reliability and installation adaptability.

[0053] In some embodiments, the angle between the clamp bevel 15 and the clamp boss 14 of the pressure plugging clamp 10 can be selected within the range of 5°-45°. When the angle is small (e.g., greater than and closer to 5°), the force required for elastic expansion of the clamp bevel 15 is more easily concentrated during the process of forming circumferential interference contact with the cylindrical surface 22, thereby generating a higher sealing difference at a local position, which is conducive to achieving reliable sealing of the pressure plugging clamp 10 under conditions of eccentricity, large parallelism errors, or complex stress conditions; and when the angle is large (e.g., less than and closer to 45°), the clamp bevel 15 is more "gentle" during the elastic expansion process, which is suitable for occasions where the flange circumferential size is relatively uniform and the working state is relatively stable.

[0054] Furthermore, when the clamp bevel 15 and the cylindrical surface 22 finally form circumferential interference contact, the angle between the clamp bevel 15 and the cylindrical surface 22 is controlled to be between 25° and 40°, so that a reasonable stress distribution and deformation can be maintained when the clamp bevel 15 is subjected to preload and pressure fluctuations during operation. In this way, even when the material properties change slightly due to temperature changes, medium corrosion, or long-term operation, the clamp bevel 15 can still maintain a good fit with the cylindrical surface 22, providing a stable and long-lasting sealing pressure ratio for the sealing cavity 30 between the clamp boss 14 and the flange gap 21 (in some cases, the sealing cavity 30 can also be composed of the clamp boss 14, the flange gap 21, the cylindrical surface 22, and the clamp bevel 15, such as after the sealant leaks from the lower sealing pressure ratio between the clamp boss 14 and the second side surface 213), making it difficult for the sealant to be lost and reducing the requirements for installation accuracy and subsequent maintenance (such as glue repair).

[0055] In summary, through the above-mentioned angle range between the clamp bevel 15 and the clamp boss 14, as well as the flexible selection of the angle value between the clamp bevel 15 and the cylindrical surface 22, this embodiment can obtain better sealing performance and applicability under various working conditions, meeting the needs of long-term, safe and economical operation in actual production.

[0056] In some embodiments, the clamp bevel 15 of the pressurized leak-proof clamp 10 is configured as an arc cross-section or a beveled cross-section at the end facing away from the clamp body 13. By adopting the arc cross-section, the end of the clamp bevel 15 can distribute stress and deformation more smoothly during the process of achieving circumferential interference contact with the cylindrical surface 22, thereby effectively reducing stress concentration under complex operating conditions such as high temperature, high pressure and medium corrosion, and improving the service life and sealing reliability of the clamp bevel 15. On the other hand, if a beveled cross-section design is adopted, it helps to make the clamp bevel 15 more easily adapt to the slight deformation and deviation of the cylindrical surface 22 when there is a certain installation error or surface roughness, and form a more uniform sealing pressure distribution under stress. Regardless of the cross-sectional form adopted, the requirements for flange installation accuracy can be reduced to a certain extent, and the maintenance cost of sealant overflow and long-term glue repair can be reduced, so that the pressure-bearing equipment flange 20 can obtain a safer, more economical and reliable sealing effect under pressurized sealing conditions without stopping the machine or production.

[0057] In some embodiments, the thickness of the clamp boss 14 of the pressurized leak-proof clamp 10 is set to 0.98-1.02 times the minimum axial dimension of the flange gap 21; thereby, during installation, the clamp boss 14 can be more firmly embedded in the flange gap 21. If the thickness of the clamp boss 14 (based on the axial extension length along the pressure-bearing equipment flange 20) is slightly less than the minimum axial dimension of the flange gap 21 (e.g., approximately 0.98 times), then even after slight deformation under harsh working conditions, the clamp boss 14 can still be ensured to fit tightly with the flange gap 21, thereby maintaining a high sealing pressure ratio even if the flange has certain installation errors or thermal deformation. Conversely, if the thickness of the clamp boss 14 is slightly greater than the minimum axial dimension of the flange gap 21 (e.g., close to 1.02 times), a relatively strong fitting force is obtained during initial installation, which can prevent the sealant from spilling or loosening along the contact interface between the clamp boss 14 and the flange gap 21 during subsequent operation. By precisely controlling the thickness of the clamp boss 14 within the range of 0.98-1.02 times, this embodiment has greater advantages in meeting the long-term stability and reliability required for pressurized sealing conditions. At the same time, it can significantly reduce the requirements for production accuracy and the frequency of subsequent glue filling, thereby improving the inherent safety and economic benefits of the continuous operation of the pressure-bearing equipment flange 20.

[0058] Please refer to further Figures 8 to 10In some embodiments, a first inclined surface 132 and a second inclined surface 133 are provided at the sealing end 131 of the pressure plugging fixture 10, and a fixture boss 14 is provided at the junction of the first inclined surface 132 and the second inclined surface 133, and the angle between the fixture boss 14 and the first inclined surface 132 is smaller than the angle between the fixture boss 14 and the second inclined surface 133, and a boss reinforcement rib 134 is provided at the junction of the first inclined surface 132 and the fixture boss 14; by making the fixture boss 14 The angle between the first bevel 132 and the clamp boss 14 is smaller than the angle between the second bevel 133 and the clamp boss 14. When the pressure plugging clamp 10 is installed and fastened to the pressure-bearing equipment flange 20, the clamp boss 14 will preferentially elastically deform along the direction from the first bevel 132 to the second bevel 133, so that a higher sealing pressure ratio is established between the specific boss and the first side surface 211 of the flange gap 21, thereby maintaining a relatively stable sealing state under adverse factors such as local deviation, medium corrosion or stress concentration in the flange gap 21. Furthermore, a reinforcing rib structure is provided at the junction of the first bevel 132 and the clamp boss 14, which can effectively disperse the concentrated stress that may occur during operation, reduce the risk of fatigue crack formation, and thus improve the overall structural rigidity and service life. Ultimately, this embodiment can achieve a long-term high-reliability sealing effect without strictly relying on flange installation accuracy and harsh working conditions, and effectively reduce the need for later maintenance and glue filling.

[0059] In some embodiments, the clamp bevel 15 of the pressurized leak-proof clamp 10 is arranged on the first bevel 132, and forms a bevel angle between the clamp bevel 15 and the first bevel 132 in the area near the clamp boss 14, and a bevel reinforcement rib 135 is provided at the bevel angle. By providing the bevel reinforcement rib 135 at the bevel angle, stress concentration can be effectively dispersed during the stress deformation process of the pressurized leak-proof clamp 10, reducing the risk of fatigue cracks, thereby ensuring the structural stability and durability of the clamp bevel 15 under long-term operation and complex working conditions (such as high temperature, high pressure, medium corrosion or installation error). In addition, the presence of the bevel reinforcement rib 135 helps to maintain a uniform distribution of the sealing pressure ratio inside the sealing cavity 30, so that the sealant maintains an appropriate sealing state in the sealing cavity 30 for a long time, thereby reducing the number of glue fillings, reducing maintenance costs, and meeting the requirements for the continuous and safe operation of the pressure-bearing equipment flange 20 without stopping the machine.

[0060] In some embodiments, the clamp body 13 of the pressurized leak-proof clamp 10 is provided with a lifting lug 19 on the outer circumferential surface facing away from the clamp boss 14. The lifting lug 19 is located at both ends of the clamp body 13 in the circumferential direction. The lifting lug 19 is provided with a connecting structure 191, and the first clamp 11 and the second clamp 12 are fixedly connected by the connecting structure 191. By providing the lifting lug 19 at both ends of the outer circumference of the clamp body 13, the operator can use the lifting lug 19 for precise positioning and support when installing, disassembling or maintaining the pressurized leak-proof clamp 10. This not only simplifies the installation process of the clamp, making it easier to adapt to different configurations of the on-site space, but also reduces the local stress concentration that may occur during the tightening process through the auxiliary support provided by the lifting lug 19, reducing the risk of damage to the clamp. In addition, the provision of the lifting lug 19 enhances the overall stability of the clamp during operation, ensuring that the clamp can still maintain a stable connection under high pressure, high temperature and vibration environments, thereby improving the service life and reliability of the pressurized leak-proof clamp 10.

[0061] In some embodiments, the glue injection channel 17 of the pressure plugging fixture 10 is designed as a straight or L-shaped structure. When a straight-line glue injection channel 17 is used, the sealant delivery path is more linear, which is suitable for installation scenarios with relatively spacious space and simple operating environment, ensuring that the sealant can be quickly and evenly injected into the sealing cavity 30, thereby improving the sealing efficiency and quality. On the other hand, the L-shaped glue injection channel 17 design is suitable for installation environments with limited space or complex flange structures. Through flexible path layout, the sealant can smoothly reach every corner of the sealing cavity 30, and even in narrow or irregular flange areas, it can ensure sufficient distribution and coverage of the sealant. By selecting the appropriate shape of the glue injection channel 17 according to the specific site conditions, the pressure plugging fixture 10 can achieve efficient and reliable sealing effects under different working conditions, further enhancing its scope of application and practical value.

[0062] Please refer to Figures 1 to 10 In some specific embodiments, for the pressurized leak plugging process of a pressure-bearing equipment flange 20, a suitable one-piece elastically deformable pressurized leak plugging fixture 10 is first selected based on the outer diameter of the pressure-bearing equipment flange 20, the size of the flange gap 21, and the operating parameters. The pressurized leak plugging fixture 10 includes a first fixture 11 and a second fixture 12. The two fixtures are fixedly connected to the flange gap 21 and the cylindrical surface 22 via a lifting lug 19 and a connecting structure 191 (bolts, clips, clamps, etc., preferably bolts) on the fixture body 13, ensuring that the fixtures are securely mounted on the outer periphery of the pressure-bearing equipment flange 20.

[0063] During installation, the clamp boss 14 is embedded in the flange gap 21. Since the initial inner diameter of the clamp bevel 15 of the pressurized leak-proof clamp 10 is smaller than the outer diameter of the cylindrical surface 22, it elastically expands during tightening, forming a continuous circumferential interference fit with the cylindrical surface 22. At the same time, the angle and bevel reinforcement ribs 135 at the junction of the first bevel 132 and the second bevel 133 achieve efficient sealing. Sealant is injected into the sealing cavity 30 between the clamp body 13 and the flange through the injection valve 16. The sealant is evenly distributed within the sealing cavity 30 through the straight or L-shaped injection channel 17, ensuring sufficient coverage and maintaining a proper seal over time.

[0064] After the pressurized leak-proofing fixture 10 is installed and tightened and the sealant is injected, the circumferential interference fit between the fixture bevel 15 and the cylindrical surface 22, as well as the high sealing pressure ratio between the fixture boss 14 and the first side surface 211 of the flange gap 21, effectively prevents the sealant from overflowing. Furthermore, the sealant can be kept stable even under adverse conditions such as local deviation, medium corrosion, or stress concentration in the flange gap 21. This method allows the pressure-bearing equipment flange 20 to achieve efficient, continuous, and reliable pressurized leak-proofing without requiring downtime for maintenance. This significantly improves the inherent safety and economic benefits of the equipment, reduces maintenance costs and operational risks, and meets the industrial demand for long-term stable operation.

[0065] That is to say, in some working conditions, the clamp boss 14 can directly complete the effective sealing of the flange gap 21 to form a first sealing cavity 31; the space between the clamp boss 14, the clamp bevel 15, the sealing end 131 and the cylindrical surface 22 will not be filled with sealant; at this time, the space between the clamp boss 14, the clamp bevel 15, the sealing end 131 and the cylindrical surface 22 only serves as the second sealing cavity 32; however, it should be emphasized that even if the sealant leaks into the second sealing cavity 32, the clamp bevel 15 can also effectively seal, and the pressure-bearing equipment flange 20 will not leak again after maintenance, and no glue injection maintenance is required at this time.

[0066] In other working conditions, when there is a local spacing in the flange gap 21 along the circumferential direction that is greater than the axial dimension of the clamp boss 14, the sealant will only leak from the lower sealing difference between the clamp boss 14 and the second side surface 213, or when the glue is injected for the first time, it will flow directly from the gap between the clamp boss 14 and the second side surface 213 into the second sealing cavity 32, and the clamp body 13, the clamp boss 14 and the clamp bevel 15 cooperate with the flange gap 21 and the cylindrical surface 22 to form an effective seal for the pressure-bearing equipment flange 20.

[0067] In the second embodiment of the present application, a method for preparing a pressurized leak-plugging fixture is further provided. The pressurized leak-plugging fixture is the pressurized leak-plugging fixture provided in the first embodiment of the present application. The method for preparing the pressurized leak-plugging fixture comprises:

[0068] Step S10, determining the angle range between the bevel edge of the fixture and the boss of the fixture based on the outer diameter of the pressure equipment flange, the flange clearance, and operating parameters, and selecting a design parameter in which the initial inner diameter is smaller than the outer diameter of the flange;

[0069] In this step, the angle range between the clamp bevel and the clamp boss is first determined (5°-45°) based on the outer diameter of the pressure equipment flange, the flange clearance, and the specific operating parameters (such as operating temperature, pressure level, and media characteristics). Furthermore, the initial inner diameter of the clamp bevel is selected to be slightly smaller than the outer diameter of the cylindrical surface. This design ensures that during installation and tightening, the clamp bevel can undergo appropriate elastic expansion, forming a circumferential interference contact with the cylindrical surface, generating an axial force component acting on the flange side surface, causing the flange clearance to elastically deform and shrink along the axial direction, thereby achieving a stable sealing pressure ratio.

[0070] Step S20, machining the material as a whole, and processing the fixture body, sealing end, fixture boss and fixture bevel on the same blank by CNC cutting or precision milling;

[0071] In this step, all components of the pressurized leak-proofing fixture, including the fixture body, sealing end, fixture boss, and beveled edge, are machined from a single blank using high-precision machining techniques such as CNC cutting or precision milling. This integrated molding process ensures structural consistency and tightness, avoiding weld defects and stress concentration issues associated with traditional connection methods such as welding, thereby enhancing the fixture's overall strength and service life.

[0072] Step S30, machining at least one injection valve and a glue injection channel connected thereto at even intervals on the fixture body, and machining the glue injection channel into a straight or L-shape as needed;

[0073] In this step, at least one injection valve (or multiple valves) is evenly spaced on the fixture body. Precision machining techniques are used to form injection channels (matching the number of valves) connecting these valves. Depending on the installation space and flange structure, the injection channels are designed to be either straight or L-shaped to ensure efficient and uniform injection of sealant into the sealing cavity. This design not only improves sealant distribution efficiency but also enhances the stability and reliability of the sealing effect.

[0074] Step S40, performing surface polishing and heat treatment on the formed fixture body;

[0075] During this step, the machined fixture body undergoes surface polishing to remove burrs and minor defects introduced during machining, ensuring smoothness and ensuring optimal contact with the flange cylindrical surface. Furthermore, appropriate heat treatment is performed to enhance the material's hardness and toughness, improving the fixture's durability and fatigue resistance in environments with high temperatures, high pressures, and corrosive media.

[0076] In step S50, the processed clamp body is split into a first clamp and a second clamp, and a connection structure is reserved at the position of the lifting lug to achieve a detachable connection between the first clamp and the second clamp during use, thereby obtaining a pressurized leak-proof clamp.

[0077] In this step, the fixture body, after surface treatment and heat treatment, is precisely divided at the pre-designed lug locations to form the first and second fixtures. This process ensures that the two fixtures can be securely and removably connected during subsequent use via the connecting structures on the lugs (such as bolts, clips, or clamps). This design not only facilitates the installation and removal of the fixture, but also allows the pressurized leak plugging fixture to be flexibly configured with multiple fixture units based on on-site space and process requirements, improving its applicability and ease of operation.

[0078] Ultimately, the pressurized leak-proofing fixture prepared by the method for preparing it provided in this embodiment not only ensures the consistency and reliability of the fixture structure, but also improves the sealing performance and service life by optimizing the glue injection channel design and strengthening the structural configuration. Ultimately, the prepared pressurized leak-proofing fixture can achieve long-term stable sealing under complex working conditions such as high temperature, high pressure, and corrosive media, meeting the high standards required for the continuous and safe operation of pressure equipment flanges without stopping the machine, significantly improving the inherent safety and economic benefits of the equipment.

[0079] In summary, the present application provides a pressure-sealing clamp for the flange of pressure-bearing equipment and a preparation method thereof, the pressure-sealing clamp comprising: a first clamp and a second clamp detachably connected to the flange gap and the cylindrical surface, the first clamp and the second clamp being both integrally formed elastic deformation structures; the first clamp and the second clamp both comprising: a clamp body, at least one injection valve being evenly spaced on the clamp body, the clamp body having a sealing end facing the flange gap; a clamp boss, the clamp boss being arranged on the sealing end, the clamp boss being used to be embedded in the flange gap; a clamp bevel, the clamp bevel being arranged at the sealing end and being aligned with the clamp boss The platform is set at an angle, and the bevel of the fixture has an initial inner diameter, which is smaller than the outer diameter of the cylindrical surface; wherein, when the first fixture and the second fixture are installed and fastened on the flange, the bevel of the fixture is elastically expanded and deformed by force, forming a circumferential interference contact with the cylindrical surface, and the reaction force generated thereby pushes the boss tightly against the flange gap surface along the direction of the flange gap, and the fixture boss 14 forms an installation interference fit with the side surface of the flange gap 21 to achieve sealing of the flange gap to form a sealed cavity, and the fixture body and the fixture boss are both provided with a glue injection channel corresponding to the injection valve, which is used to inject the sealant into the sealed cavity formed between the fixture and the flange. The pressure plugging fixture is formed by arranging an integral elastic deformation structure (a first clamp and a second clamp) that is integrally machined on the outer periphery of the flange of the pressure-bearing equipment, so that after the bevel edge of the clamp, the first clamp and the second clamp are installed and tightened, the bevel edge of the clamp is elastically expanded under force, forming a circumferential interference contact with the cylindrical surface of the flange, generating an axial component of force acting on the side surface of the flange, causing the flange gap to elastically deform and shrink along the axial direction, thereby obtaining a continuous and uniform sealing pressure ratio without strictly relying on the concentricity and parallelism of the flange; at the same time, under the action of the reaction force of the pressure-bearing equipment flange on the bevel edge of the clamp, the clamp boss is tightly attached to at least one surface of the flange gap (the surface away from the bevel edge of the clamp) in the direction of the flange gap, effectively preventing the sealant from overflowing, and reducing the influence of processing and measurement errors on the sealing effect; on this basis, the one-piece molding structure without welding avoids the difficulties in weld detection and potential quality risks of the pressure plugging fixture. In actual use, the frequency of glue filling can be reduced by selecting a suitable sealant, thereby maintaining long-term stable sealing performance in high temperature, high pressure and hazardous media environments. This structural improvement not only improves the safety and reliability of the pressure-bearing equipment flange pressure seal, but also reduces personnel operation risks and maintenance costs, and reduces economic losses caused by frequent maintenance and production stoppages, and has both significant safety benefits and social value.

[0080] It should be understood that the application of this application is not limited to the above examples. For ordinary technicians in this field, they can make improvements or changes based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to this application.

Claims

1. A pressure-sealing fixture for a flange of a pressure-bearing equipment, wherein the flange of the pressure-bearing equipment comprises two flanges arranged opposite to each other to form a flange gap and a cylindrical surface surrounding the outer circumference of the flanges, characterized in that: The pressure plugging fixture comprises: A first clamp and a second clamp detachably connected to the flange gap and the cylindrical surface, wherein the first clamp and the second clamp are both integrally formed elastic deformation structures; The first fixture and the second fixture both include: A fixture body, wherein at least one injection valve is evenly spaced apart and the fixture body has a sealing end facing the flange gap; A clamp boss, the clamp boss is arranged on the sealing end and is used to be embedded in the flange gap; A fixture bevel, the fixture bevel is provided at the sealing end and is provided at an angle to the fixture boss, the fixture bevel has an initial inner diameter, and the initial inner diameter is smaller than the outer diameter of the cylindrical surface; the sealing end is provided with a first bevel and a second bevel, the fixture bevel is provided on the first bevel; Among them, when the first clamp and the second clamp are installed and fastened on the flange of the pressure-bearing equipment, the clamp bevel is elastically expanded and deformed under force, forming a circumferential interference contact with the cylindrical surface, and the reaction force generated thereby pushes the clamp boss tightly against the flange gap surface along the flange gap direction, and the clamp boss and the side surface of the flange gap form an installation interference fit to form a sealed cavity. The clamp body and the clamp boss are both provided with a glue injection channel corresponding to the injection valve, which is used to inject sealant into the sealed cavity formed between the pressurized leak-proof clamp and the pressure-bearing equipment flange.

2. The pressure plugging fixture according to claim 1, characterized in that: The radial extension length of the clamp oblique edge is smaller than the radial extension length of the clamp boss.

3. The pressure plugging fixture according to claim 1, characterized in that: The included angle between the clamp bevel and the clamp boss is in the range of 5°-45°; when the clamp bevel forms circumferential interference contact with the cylindrical surface, the clamp bevel and the cylindrical surface are set at an included angle of 25°-40°.

4. The pressure plugging fixture according to claim 1, characterized in that: The end of the clamp's hypotenuse facing away from the clamp body is configured as an arc cross section or an oblique cross section.

5. The pressure plugging fixture according to claim 1, characterized in that: The thickness of the clamp boss is set to 0.98-1.02 times the minimum axial dimension of the flange gap.

6. The pressure plugging fixture according to claim 1, characterized in that: The clamp boss is arranged at the junction of the first inclined surface and the second inclined surface, and the angle between the clamp boss and the first inclined surface is smaller than the angle between the clamp boss and the second inclined surface, and a boss reinforcement rib is provided at the junction of the first inclined surface and the clamp boss.

7. The pressure plugging fixture according to claim 6, characterized in that: The clamp bevel and the first bevel have a bevel angle close to the clamp boss, and a bevel reinforcement rib is provided at the bevel angle.

8. The pressure plugging fixture according to claim 1, characterized in that: The outer circumferential surface of the clamp body away from the clamp boss is provided with a lifting lug, and the lifting lug is located at both ends of the clamp body along the circumferential direction. The lifting lug is provided with a connecting structure, and the first clamp and the second clamp are fixedly connected through the lifting lug.

9. The pressure plugging fixture according to claim 1, characterized in that: The glue injection channel is arranged in a straight shape or an L shape.

10. A method for preparing the pressurized leak-sealing fixture according to any one of claims 1 to 7, characterized in that: The following steps are involved: According to the outer diameter of the pressure equipment flange, the flange clearance and the operating parameters, determine the angle range between the fixture bevel and the fixture boss, and select the design parameters in which the initial inner diameter is smaller than the outer diameter of the cylindrical surface; The material is integrally machined and formed, and the fixture body, sealing end, fixture boss and fixture bevel are processed on the same blank by CNC cutting or precision milling; At least one injection valve and a glue injection channel connected thereto are evenly spaced on the fixture body, and the glue injection channel is processed into a straight or L-shape as needed; Performing surface polishing and heat treatment on the machined fixture body; The processed clamp body is divided into a first clamp and a second clamp. A lifting lug is provided on the outer peripheral surface of the clamp body away from the clamp boss. The lifting lug is located at both ends of the clamp body along the circumferential direction. A connection structure is reserved at the position of the lifting lug to realize the detachable connection between the first clamp and the second clamp when in use, thereby obtaining a pressure-sealing clamp.

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