Under-pressure leaking stoppage clamp for pressure-bearing equipment flange and preparation method of under-pressure leaking stoppage clamp

Abstract

The invention relates to the technical field of pressure leakage stoppage of pressure-bearing equipment, and particularly provides a pressure leakage stoppage clamp for a pressure-bearing equipment flange and a preparation method of the pressure leakage stoppage clamp, and the pressure leakage stoppage clamp comprises a first clamp and a second clamp which are detachably connected to a flange plate gap and a cylindrical surface and are of an integrally-formed elastic deformation structure; each of the first fixture and the second fixture comprises a fixture body, a fixture boss and a fixture bevel edge, and when the first fixture and the second fixture are mounted and fastened on the flange, the fixture bevel edges are stressed to elastically expand and deform, form circumferential interference contact with the cylindrical surface and generate axial component force to act on the side surface of the flange; the boss is tightly attached to the surface of the flange plate gap in the direction of the flange plate gap through the generated counter-acting force, and the boss of the clamp and the side surface of the flange plate gap are in installation interference fit, so that the flange plate gap is sealed, and a sealed cavity is formed; and then glue is injected to realize pressure sealing of the flange of the pressure-bearing equipment.

Description

Technical Field

[0001] The present application relates to the technical field of under-pressure plugging of pressure-bearing equipment, and in particular to an under-pressure plugging fixture for a flange of pressure-bearing equipment 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 temporary suspension of 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 of the production line).

[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 mostly welded, and there is no effective means to detect the quality of the weld, which poses a potential safety hazard; second, the concentricity and parallelism of the flange installation are stringent, 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 prior art has defects and shortcomings and needs further improvement and development. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present 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 plugging 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 flange, wherein the pressure plugging fixture comprises:

[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, on which at least one injection valve is evenly spaced, 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 the clamp boss is used to be embedded in the flange gap;

[0011] A clamp bevel, the clamp bevel is disposed at the sealing end and is disposed at an angle with the clamp boss, the clamp bevel has an initial inner diameter, and the initial inner diameter is smaller than the 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 by force, forming a circumferential interference contact with the cylindrical surface, and the reaction force generated thereby presses the boss 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, an 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 arranged at the bevel angle.

[0019] Optionally, a lifting lug is provided on the outer circumferential 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 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 arranged in a straight shape or an 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 flange of the pressure-bearing equipment, the flange gap size and the operating parameters, determine the angle range between the bevel of the fixture and the boss of the fixture, and select the design parameter that the initial inner diameter is smaller than the outer diameter of the flange;

[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 shape or an L shape as required;

[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 when in use, thereby obtaining a pressure-sealed leak-stopping clamp.

[0027] Beneficial effects:

[0028] The present application provides a pressure-sealing plugging clamp for the flange of pressure-bearing equipment and a preparation method thereof. The pressure-sealing plugging clamp is provided with an integrally machined one-piece elastic deformation structure (a first clamp and a second clamp) 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 to form 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 installation interference fit, which effectively prevents the sealant from overflowing and reduces the influence of processing and measurement errors on the sealing effect; on this basis, the one-piece structure without welding avoids the difficulty of weld detection and potential quality risks of the pressurized 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 under high temperature, high pressure and hazardous medium environments. This structural improvement not only improves the safety and reliability of the pressurized sealing of the flange of the pressure-bearing equipment, but also reduces the operating risks and maintenance costs of personnel, and also reduces the economic losses caused by frequent maintenance and shutdowns, and has both significant safety benefits and social value. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It 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 the present application;

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

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

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

[0034] Figure 6 It is a 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 the present 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] Fig. 9 It is a partial cross-sectional schematic diagram along the radial direction of the matching relationship between the pressure plugging fixture and the flange of the pressure-bearing equipment in the preferred embodiment provided in the present application;

[0038] Fig.10 It is another partial cross-sectional schematic diagram along the radial direction of the matching relationship between the pressure plugging fixture and the flange of the pressure-bearing equipment in the preferred embodiment provided in the present 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] In order to make the purpose, technical solution and advantages of the present application clearer and more specific, the present application is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described here are only used to explain the present application and are not used to limit the present 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 positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 technical features indicated. Thus, 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 clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] Please refer to Figures 1 to 7In the first embodiment of the present application, a pressure-sealing plugging fixture 10 for a pressure-bearing equipment flange 20 is provided. The pressure-bearing equipment flange 20 is usually 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 plugging fixture 10 refers to a fixture used when online treatment of leakage of the pressure-bearing equipment flange 20 is implemented without stopping the machine (without stopping the production line production) by using pressure sealing (also known as pressure plugging) technology.

[0045] The pressurized leak-stopping 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 integrally formed elastic deformation structures. When the first clamp 11 and the second clamp 12 are connected together, a circumferential seal is formed on the pressure-bearing 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-bearing 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 each include a clamp body 13, a clamp boss 14 and a clamp bevel 15. The clamp body 13 is evenly spaced with at least one injection valve 16, 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 around 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 fastened When on the flange, the clamp bevel 15 is elastically expanded and deformed by force, forming a circumferential interference contact with the cylindrical surface 22, and the reaction force generated thereby presses the boss against the flange gap surface along the direction of the flange gap 21, and 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 axial spacing of the flange gap is elastically deformed and miniaturized, 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 to say, in the prior art, in long-term operating pressure-bearing equipment (such as pressure pipes, pressure vessels and boiler interfaces), the flange connection parts are prone to leakage due to factors such as medium corrosion, gasket aging, installation errors and thermal fluctuations. In order to overcome the problems of the existing pressurized sealing technology that requires strict guarantee of flange concentricity and parallelism, welding quality risks and frequent glue repair and maintenance, this embodiment adopts a pressurized leak plugging fixture 10 with an integrally formed elastic deformation structure, and the first fixture 11 and the second fixture 12 prepared by integral machining are respectively detachably connected to the outer periphery of the flange, thereby achieving efficient, continuous and stable sealing without stopping the machine.

[0048] A clamp boss 14 is provided around the sealing end 131 of the clamp body 13 of the pressure plugging clamp 10, 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. When installing 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 weld the clamp body 13, fundamentally eliminating the hidden dangers of weld quality, and 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 injection channel 17 on the clamp body 13, reducing the need for long-term glue filling, and reducing maintenance costs and operating risks.

[0049] Finally, the pressurized plugging fixture 10 provided in this embodiment realizes long-term intrinsically safe sealing in high temperature, high pressure, and corrosive media environments, reduces sealing failures caused by installation errors, adapts to installation errors, reduces processing accuracy requirements, and maintains stable operation without stopping production for maintenance, thereby improving economic benefits and production efficiency. The pressurized plugging fixture 10 significantly improves the reliability and practical value of the pressurized sealing of the pressure-bearing equipment flange 20 by virtue of its one-piece elastic deformation design, circumferential interference contact seal, no welding risks, and optimized injection path.

[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 plugging fixture 10 is installed on the pressure-bearing equipment flange 20, the fixture 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 fixture boss 14 is more closely attached to the first side surface 211 under the reaction force of the fixture bevel 15, so that the sealing ratio between the fixture boss 14 and the first side surface 211 is higher than the sealing ratio between the fixture boss 14 and the second side surface 213. When there is a situation where the local spacing of the flange gap 21 along the circumferential direction is greater than the axial size of the fixture boss 14, the sealant will only leak from the lower sealing ratio between the fixture boss 14 and the second side surface 213. However, since the clamp bevel 15 has formed a circumferential interference contact seal, the leaked sealant is still confined inside the sealing cavity 30 and will not spread outward, thereby avoiding the problem of secondary leakage. This design can more effectively ensure the reliability and safety of long-term sealing when dealing with local installation errors, thermal deformation or dimensional unevenness.

[0051] It should be noted that the pressurized leak-plugging clamp 10 can also include multiple clamps, for example, the pressurized leak-plugging clamp 10 includes a first clamp 11, a second clamp 12 and a third clamp; or the pressurized leak-plugging clamp 10 includes a first clamp 11, a second clamp 12, a third clamp...the Nth clamp, wherein 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 is convenient for installation and can also improve the scope of application of the pressurized leak-plugging 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, thereby 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 clamp bevel 15 forms a radial extension slightly smaller than the clamp boss 14 in the radial direction of the cylindrical surface 22, so that the clamp bevel 15 can elastically expand and deform under force, and when it achieves circumferential interference contact with the flange cylindrical surface 22, 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 clamp bevel 15 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 (such as greater than and closer to 5°), the clamp bevel 15 is easier to gather the force required for elastic expansion in the process of forming circumferential interference contact with the cylindrical surface 22, thereby producing a higher sealing difference at a local position, which is conducive to achieving reliable sealing of the pressure plugging clamp 10 under eccentricity, large parallelism errors or complex stress conditions; and when the angle is large (such as less than and closer to 45°), the clamp bevel 15 is more "gentle" in the elastic expansion process, which is suitable for occasions where the circumferential size of the flange is relatively uniform and the working state is relatively stable.

[0054] Furthermore, when the clamp bevel 15 and the cylindrical surface 22 finally form a circumferential interference contact, the angle between the clamp bevel 15 and the cylindrical surface 22 is controlled between 25° and 40°, so that the clamp bevel 15 can maintain a reasonable stress distribution and deformation when the clamp bevel 15 is subjected to preload and pressure fluctuations during operation. In this way, even when the material properties are slightly changed 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, and provide a stable and 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), so that the sealant is not easy to lose, and the requirements for installation accuracy and later maintenance (such as glue filling) are reduced.

[0055] In summary, through the above-mentioned angle range between the clamp bevel 15 and the clamp boss 14, and 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 a variety of 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 pressure plugging clamp 10 is set to a circular arc section or a bevel section at the end away from the clamp body 13. By adopting the circular arc section, the end of the clamp bevel 15 can distribute stress and deformation more smoothly in 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 bevel section design is adopted, it will help to make the clamp bevel 15 easier to adapt to the slight deformation and deviation of the cylindrical surface 22 under certain installation errors 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 filling can be reduced, so that the pressure-bearing equipment flange 20 can obtain a safer, more economical and reliable sealing effect under pressure sealing conditions without stopping the machine or production.

[0057] In some embodiments, the thickness of the clamp boss 14 of the pressure plugging clamp 10 is set to 0.98-1.02 times the minimum axial dimension of the flange gap 21; thus, the clamp boss 14 can be more robustly embedded in the flange gap 21 during the installation process. If the thickness of the clamp boss 14 (based on the axial extension length of the pressure-bearing equipment flange 20) is slightly smaller than the minimum axial dimension of the flange gap 21 (such as about 0.98 times), the clamp boss 14 can still be ensured to fit tightly with the flange gap 21 after a slight deformation under severe working conditions, thereby maintaining a high sealing pressure ratio under the condition that the flange has a certain installation error or thermal deformation. On the contrary, if the thickness of the clamp boss 14 is slightly larger than the minimum axial dimension of the flange gap 21 (such as close to 1.02 times), a relatively strong fitting force is obtained during the initial installation, which can prevent the sealant from unnecessary overflow 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 intrinsic 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 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 plugging clamp 10 is arranged on the first bevel 132, and a bevel angle is formed 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 arranged at the bevel angle. By arranging the bevel reinforcement rib 135 at the bevel angle, the stress concentration can be effectively dispersed during the stress deformation process of the pressurized plugging clamp 10, and the risk of fatigue cracks can be reduced, 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 specific pressure inside the sealing cavity 30, so that the sealant can maintain 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 plugging clamp 10 is provided with a lifting lug 19 on the outer circumferential surface away from the clamp boss 14, and 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 through 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 plugging 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 plugging clamp 10.

[0061] In some embodiments, the injection channel 17 of the pressurized plugging fixture 10 is designed as a straight or L-shaped structure. When a straight 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 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 the full distribution and coverage of the sealant. By selecting the appropriate shape of the injection channel 17 according to the specific site conditions, the pressurized plugging fixture 10 can achieve efficient and reliable sealing effects under different working conditions, further improving its scope of application and practical value.

[0062] Please refer to Figures 1 to 10 In some specific embodiments, for the process of plugging leaks under pressure of the flange 20 of the pressure-bearing equipment, firstly, according to the outer diameter size of the flange 20 of the pressure-bearing equipment, the size of the flange gap 21 and the parameters of the use condition, a suitable one-piece elastic deformation plugging fixture 10 under pressure is selected. The plugging fixture 10 under pressure includes a first fixture 11 and a second fixture 12, and the two fixtures are fixedly connected to the flange gap 21 and the cylindrical surface 22 through the ear 19 and the connecting structure 191 (bolts, buckles, clamps, etc., preferably bolts) on the fixture body 13, so as to ensure that the fixture is firmly installed on the outer periphery of the flange 20 of the pressure-bearing equipment.

[0063] During the installation process, the clamp boss 14 is embedded in the flange gap 21. The clamp bevel 15 of the pressure plugging clamp 10 has an initial inner diameter smaller than the outer diameter of the cylindrical surface 22, so it expands elastically during tightening, forming a continuous circumferential interference contact with the cylindrical surface 22. At the same time, the angle and bevel reinforcement ribs 135 are designed at the junction of the first bevel 132 and the second bevel 133 to achieve efficient sealing. The sealant is injected into the sealing cavity 30 between the clamp body 13 and the flange through the injection valve 16, and the sealant is evenly distributed in the sealing cavity 30 through the straight or L-shaped injection channel 17 to ensure that the sealant is fully covered and maintains a proper sealing state for a long time.

[0064] After the pressure plugging fixture 10 is installed and tightened and the sealant is injected, the circumferential interference contact between the fixture bevel 15 and the cylindrical surface 22, and the high sealing pressure ratio between the fixture boss 14 and the first side surface 211 of the flange gap 21, effectively prevent the sealant from overflowing, and maintain a stable sealing effect under adverse conditions such as local deviation, medium corrosion or stress concentration in the flange gap 21. Through this method, the pressure equipment flange 20 can achieve efficient, continuous and reliable pressure plugging without stopping for maintenance, which significantly improves the inherent safety and economic benefits of the equipment, reduces maintenance costs and operating risks, and meets the industrial needs of 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 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 directly flow into the second sealing cavity 32 from the gap between the clamp boss 14 and the second side surface 213 during the first injection of glue, 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 pressure plugging fixture is further provided. The pressure plugging fixture is the pressure plugging fixture provided in the first embodiment of the present application. The method for preparing the pressure plugging fixture comprises:

[0068] Step S10, determining the angle range between the clamp bevel and the clamp boss according to the outer diameter of the pressure equipment flange, the flange gap size and the operating condition parameters, and selecting a design parameter in which the initial inner diameter is smaller than the flange outer diameter;

[0069] In this step, the angle range between the clamp bevel and the clamp boss (5°-45°) is first determined based on the outer diameter of the pressure equipment flange, the flange gap size, and specific operating parameters (such as operating temperature, pressure level, and medium characteristics). In addition, 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 the installation and tightening process, the clamp bevel can produce appropriate elastic expansion, form circumferential interference contact with the cylindrical surface, generate axial force acting on the flange side surface, and elastically deform the spacing of the flange gap along the axial direction to achieve a stable sealing pressure ratio.

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

[0071] In this step, various components of the pressurized plugging fixture, including the fixture body, sealing end, fixture boss and fixture bevel, are processed on the same blank through high-precision machining technologies such as CNC cutting or precision milling. This integral molding process ensures the consistency and tightness of the fixture structure, avoids weld defects and stress concentration problems that may be caused by traditional connection methods such as welding, and thus improves the overall strength and service life of the fixture.

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

[0073] In this step, at least one injection valve (multiple valves may be provided) is evenly spaced on the fixture body, and a glue injection channel (consistent with the number of injection valves) connected to the injection valve is formed by precision machining technology. According to the different requirements of the on-site installation space and flange structure, the injection channel is designed to be a straight or L-shaped to ensure that the sealant can be efficiently and evenly injected into the sealing cavity. This design not only improves the distribution efficiency of the sealant, but also enhances the stability and reliability of the sealing effect.

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

[0075] In this step, the fixture body after machining needs to be polished to remove burrs and tiny defects generated during the machining process, ensure the smoothness of the fixture surface, and thus improve the contact quality with the flange cylindrical surface. In addition, appropriate heat treatment is performed to enhance the hardness and toughness of the material, and improve the durability and fatigue resistance of the fixture in high temperature, high pressure and corrosive media environments.

[0076] 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 when in use, thereby obtaining a pressure plugging clamp.

[0077] In this step, the fixture body after surface treatment and heat treatment is precisely divided through the pre-designed lifting lug position to form the first fixture and the second fixture. This process ensures that the two fixtures can be firmly and detachably connected through the connection structure on the lifting lug (such as bolts, buckles or clamps) during subsequent use. This design not only facilitates the installation and removal of the fixture, but also enables the pressurized plugging fixture to flexibly configure multiple fixture units according to the on-site space and process requirements, thereby improving its scope of application and ease of operation.

[0078] Finally, the prepared pressurized plugging fixture by the preparation method of the pressurized plugging fixture 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 injection channel design and strengthening the structural configuration. Finally, the prepared pressurized plugging fixture can achieve long-term stable sealing under complex working conditions such as high temperature, high pressure, and corrosive media, meeting the high standard requirements for continuous and safe operation of the flange of the pressure-bearing equipment without stopping the machine, and significantly improving the inherent safety and economic benefits of the equipment.

[0079] In summary, the present application provides a pressure-sealing plugging clamp for the flange of a pressure-bearing equipment and a preparation method thereof, wherein the pressure-sealing plugging clamp 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 clamp and the second clamp both comprise: a clamp body, wherein at least one injection valve is evenly spaced on the clamp body, wherein the clamp body has a sealing end facing the flange gap; a clamp boss, wherein the clamp boss is arranged on the sealing end, and wherein the clamp boss is used to be embedded in the flange gap; a clamp bevel, wherein the clamp bevel is arranged at the sealing end and is aligned with the clamp boss The platform is set at an angle, and the clamp bevel has an initial inner diameter, which is smaller than the outer diameter of the cylindrical surface; wherein, when the first clamp and the second clamp are installed and fastened on the flange, the clamp bevel is elastically expanded and deformed by force, forming a circumferential interference contact with the cylindrical surface, and the reaction force generated thereby presses the boss against the flange gap surface along the flange gap direction, and the clamp boss 14 forms an installation interference fit with the side surface of the flange gap 21, thereby realizing the sealing of the flange gap to form a sealed cavity, and 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. The pressure plugging clamp is provided with an integrally machined elastic deformation structure (the first clamp and the second clamp) 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, generating an axial component of force acting on the side surface of the flange, so that the spacing of the flange gap along the axial direction is elastically deformed and minimised, 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 flange of the pressure-bearing equipment on the clamp bevel, the clamp boss is tightly attached to at least one surface of the flange gap (the surface away from the clamp bevel) 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 difficulty of weld detection and potential quality risks of the pressure plugging clamp. 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 medium 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 the present application is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made 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 plugging 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 pressurized 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, on which at least one injection valve is evenly spaced, 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 the clamp boss is used to be embedded in the flange gap; A clamp bevel, the clamp bevel is disposed at the sealing end and is disposed at an angle with the clamp boss, the clamp bevel has an initial inner diameter, and the initial inner diameter is smaller than the outer diameter of the cylindrical surface; 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 by force, forming a circumferential interference contact with the cylindrical surface, and the reaction force generated thereby presses the boss 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.

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

3. The pressure plugging fixture according to claim 1 is characterized in that: The 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 angle of 25°-40°.

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

5. The pressure plugging fixture according to claim 1 is 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 is characterized in that: The sealing end is provided with a first inclined surface and a second inclined surface, the clamp boss is provided 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 is characterized in that: The clamp bevel is arranged on the first bevel, and the clamp bevel and the first bevel have a bevel angle close to the clamp boss, and a bevel reinforcing rib is arranged at the bevel angle.

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

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

10. A method for preparing the pressure plugging fixture according to any one of claims 1 to 9, characterized in that: The following steps are involved: According to the outer diameter of the flange of the pressure-bearing equipment, the flange gap size and the operating parameters, determine the angle range between the bevel of the fixture and the boss of the fixture, and select the design parameter that the initial inner diameter is smaller than the outer diameter of the flange; 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 shape or an L shape as required; Performing surface polishing and heat treatment on the machined fixture body; 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 when in use, thereby obtaining a pressure-sealed leak-stopping clamp.

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