Flange sealing structure of anti-plastic blocking polymerization kettle and processing modification method thereof

Abstract

The application relates to the technical field of chemical equipment sealing, and discloses a plastic-plugging-preventing sealing structure of a polymerizer flange and a processing reconstruction method thereof. The plastic-plugging-preventing sealing structure of the polymerizer flange comprises pipeline one and pipeline two, opposite ends of the pipeline one and the pipeline two are respectively provided with flange one and flange two, opposite sides of the flange one and the flange two are provided with metal-wound gaskets, the metal-wound gasket comprises an inner ring, the inner diameter D1 of the inner ring is 80 mm and is consistent with the diameter of a flange pipe mouth, the inner ring of the metal-wound gasket is provided with a tetrafluoroethylene gasket, the outer wall of the pipeline one is fixedly connected with a limiting ring, and the outer wall of the pipeline one is rotationally connected with a rotating ring. The tetrafluoroethylene gasket with the specification of phi 99*90*1 mm is attached to the inner ring of the metal-wound gasket, the tetrafluoroethylene gasket is tightly embedded in the contact position of the inner ring and the flange pipe mouth, and a double-sealing structure of the metal-wound gasket main sealing and the tetrafluoroethylene gasket auxiliary sealing is formed.

Description

Technical Field

[0001] This invention relates to the field of sealing technology for chemical equipment, specifically to a flange sealing structure for preventing plastic blockage in polymerization reactors and its processing and modification methods. Background Technology

[0002] During the production of paste resin, the monomer gaseous and liquid media in the polymerization reactor reaction stage are prone to polymerization reactions at various pipe openings on the reactor surface, generating plastics. Among them, the flange connection positions of the lower short section of the recovery main control valve and the short section after the monomer feed pipeline control valve are the areas with the most severe plastic accumulation. Therefore, a sealing structure is required to seal the flange connection positions.

[0003] The existing flange sealing structure relies solely on spiral wound gaskets for sealing, without any auxiliary sealing structure, resulting in poor sealing performance. Furthermore, the D2222 type spiral wound gasket is commonly used for sealing at these flange connections, but its inner ring diameter is 90mm, which is larger than the 80mm diameter of the flange opening of the polymerization reactor recovery pipeline. This creates an annular pre-reserved gap between the gasket and the pipe opening. During the reaction, the monomer medium can easily seep into this gap, continuously polymerize and gradually accumulate within it, eventually causing blockage of the pipeline section and affecting continuous production. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an anti-plastic clogging flange sealing structure for polymerization reactors and its processing and modification method. This solves the problem that existing flange sealing structures rely solely on spiral wound gaskets for sealing, lacking auxiliary sealing structures, resulting in poor sealing performance. Furthermore, these flange connections commonly use D2222 type spiral wound gaskets for sealing, but their inner ring diameter is 90mm, larger than the 80mm diameter of the flange opening in the polymerization reactor recovery pipeline. This creates a pre-existing annular gap between the gasket and the pipe opening. During the reaction, the monomeric medium easily seeps into this gap, continuously polymerizes within it, and gradually accumulates, ultimately causing blockage of the pipeline section and affecting continuous production.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a flange sealing structure for an anti-plastic clogging polymerization reactor, comprising a pipe 1 and a pipe 2, wherein flange 1 and flange 2 are respectively installed at opposite ends of pipe 1 and pipe 2, and a metal spiral wound gasket is provided on opposite sides of flange 1 and flange 2. The metal spiral wound gasket includes an inner ring with an inner diameter D1 of 80mm, which is consistent with the diameter of the flange opening. A PTFE gasket is provided at the inner ring of the metal spiral wound gasket. A limit ring is fixedly connected to the outer wall of pipe 1, and a rotating ring is rotatably connected to the outer wall of pipe 1. The rotating ring has evenly distributed openings inside, and an arc-shaped protrusion is evenly fixedly connected to one side of the rotating ring, with the arc-shaped protrusion corresponding to the openings. A handle is evenly installed on one side of the rotating ring. A locking connecting rod is provided in the mounting holes of flange 1 and flange 2, with a rod head fixedly connected to one end of the locking connecting rod and a rectangular groove opened at the other end. A sealing assembly is provided on one side of flange 2.

[0006] By adopting the above technical solution, the adjustable locking structure composed of a rotating ring, an arc-shaped convex plate, a locking connecting rod, and a rotating baffle can precisely adjust the locking force between flanges according to actual working conditions, ensuring that the core sealing gasket and the flange sealing surface are tightly fitted without gaps, thus guaranteeing the main sealing effect. At the same time, the compression of the gas ring by the rotating baffle during the locking process realizes the adaptive transmission of air pressure, causing the sealing ring to expand under air pressure and adhere to the outer wall of the flange, forming an external air pressure seal. This achieves all-round sealing protection from the inner mating surface of the flange to the outer wall, completely blocking the leakage path of the medium, effectively avoiding the safety hazards of leakage of high-risk media such as vinyl chloride, and improving the sealing performance and safety of equipment operation. By optimizing the inner ring diameter of the spiral wound gasket to 80mm to perfectly match the flange pipe diameter, the annular pre-reserved gap between the gasket and the pipe opening is eliminated, thus preventing the infiltration and accumulation of monomeric media from a structural perspective. At the same time, a PTFE gasket with specifications of φ99×90×1mm is attached to the inner ring. The PTFE gasket is tightly fitted at the contact position between the inner ring and the flange pipe opening, forming a dual sealing structure of the main seal of the spiral wound gasket and the auxiliary seal of the PTFE gasket. This fundamentally inhibits the polymerization reaction of monomeric media at the sealing site and solves the core problem of plasticizer clogging of pipelines.

[0007] Preferably, a rotating baffle is provided in the rectangular groove of the locking connecting rod, a limiting groove is provided in the middle of the rotating baffle, and a pin is installed at the end of the locking connecting rod away from the rod head, the pin being disposed in the limiting groove of the rotating baffle.

[0008] Preferably, the limiting ring has uniformly spaced positioning holes inside, the rotating ring has uniformly spaced limiting holes at its bottom, a locking bolt is provided in one of the limiting holes of the rotating ring, and the outer wall of the locking bolt is threaded into one of the positioning holes.

[0009] Preferably, the sealing assembly includes a gas ring, one side of which is fixedly connected to one side of flange two, and the other side of which is fixedly connected to a compression plate.

[0010] Preferably, the sealing assembly further includes a sealing ring, the bottom of which is mounted on the outer wall of flange one and flange two, and an annular plate is fixedly connected to the outer wall of the sealing ring.

[0011] Preferably, a connecting pipe is fixedly connected between the sealing ring and the gas ring, and a connecting hole is provided at the top of the annular plate.

[0012] Preferably, a sleeve is fixedly connected to the outer wall of the annular plate, and a movable block is slidably connected inside the sleeve.

[0013] Preferably, a spring is fixedly connected to the top of the movable block, and the top end of the spring is fixedly connected to the inner wall of the top end of the sleeve.

[0014] Preferably, an indicator light is installed on the top of the sleeve, and a push switch is installed on the inner wall of the top of the sleeve, and the indicator light and the push switch are electrically connected.

[0015] The method for processing and modifying the flange sealing structure of the polymerization reactor to prevent plastic blockage includes the following steps: When two pipes are connected and fixed by flanges, hold the handle and rotate the rotating ring on the outer wall of pipe one to make it rotate the arc-shaped convex plate. The convex part of the arc-shaped convex plate gradually comes into contact with and abuts the head of the pull rod, and then gradually pulls the locking connecting rod to move. The locking connecting rod drives the rotating baffle to move gradually towards flange two. By rotating the ring, the locking force between flange one and flange two can be adjusted to ensure that the metal spiral wound gasket and PTFE gasket can fully and tightly fit with the flange sealing surface and eliminate the gap of the sealing surface. When the gasket and the flange sealing surface reach the best fit, insert the locking bolt into the corresponding limit hole and positioning hole to fix the position of the rotating ring, thereby locking the flange locking force and realizing the connection and fixation of the two flanges. The inner ring diameter of the metal spiral wound gasket is optimized to 80mm, which perfectly matches the flange pipe diameter, eliminating the annular pre-reserved gap between the gasket and the pipe, thus preventing the infiltration and accumulation of single media from a spatial structure perspective; at the same time, a PTFE gasket with a specification of φ99×90×1mm is attached to the inner ring, and the PTFE gasket is tightly fitted at the contact position between the inner ring and the flange pipe, forming a dual sealing structure of metal spiral wound gasket main seal and PTFE gasket auxiliary seal; As the rotating baffle moves toward flange two, it will squeeze the extrusion plate, compressing the gas ring. The gas inside the gas ring enters the sleeve through the connecting pipe, and then flows into the sealing ring through the connecting hole, causing the sealing ring to expand under air pressure and tightly adhere to the outer wall of the flange, forming a pneumatic seal on the outer gap of the flange connection, blocking the medium leakage path from the outer wall of the flange. As the gas inside the gas ring is squeezed into the sealing ring, the gas simultaneously enters the sleeve inside the outer wall of the annular plate. As the gas pressure inside the sleeve gradually increases, it pushes the movable block inside to move upward along the inner wall of the sleeve. The spring is compressed. When the movable block moves upward to contact the push switch on the inner wall of the top of the sleeve and forms a squeeze, the push switch is triggered to turn on the power, causing the indicator light on the top of the sleeve to light up. This light signal is a visual indication that the seal is completely in place, indicating to the operator that the tightening force between the flanges has reached the standard and that the core seal and the outer gas pressure seal have formed a gapless seal. During disassembly, the rotating ring is rotated in the opposite direction. The protrusion of the arc-shaped convex plate gradually moves away from the rod head, the tension on the locking connecting rod disappears, and the locking force on the flange mating surface is released. Then, the rotating baffle is rotated to be parallel to the locking connecting rod, eliminating the interference resistance between the components and realizing the quick disassembly of the two flanges.

[0016] This invention provides a flange sealing structure for preventing plastic blockage in polymerization reactors and its processing and modification method. It has the following beneficial effects: 1. This invention, through an adjustable locking structure composed of a rotating ring, an arc-shaped convex plate, a locking connecting rod, and a rotating baffle, can precisely adjust the locking force between flanges according to actual working conditions, ensuring a tight fit between the core sealing gasket and the flange sealing surface without gaps, thus guaranteeing the main sealing effect. Simultaneously, during the locking process, the rotating baffle's compression of the gas ring achieves adaptive gas pressure transmission, causing the sealing ring to expand under gas pressure and adhere to the outer wall of the flange, forming an external pneumatic seal. This provides all-around sealing protection from the inner mating surface of the flange to the outer wall, completely blocking the leakage path of the medium, effectively avoiding the safety hazards of leakage of high-risk media such as vinyl chloride, and improving the sealing performance and safety of equipment operation.

[0017] 2. This invention optimizes the inner ring diameter of the metal spiral wound gasket to 80mm, perfectly matching the flange pipe diameter, eliminating the annular pre-reserved gap between the gasket and the pipe opening, thus preventing the infiltration and accumulation of monomeric media from a spatial structural perspective. Simultaneously, a PTFE gasket with specifications of φ99×90×1mm is attached to the inner ring, and the PTFE gasket is tightly fitted at the contact position between the inner ring and the flange pipe opening, forming a dual sealing structure of the metal spiral wound gasket as the main seal and the PTFE gasket as the auxiliary seal. This fundamentally inhibits the polymerization reaction of monomeric media at the sealing location, solving the core problem of plasticizer clogging of pipelines.

[0018] 3. In this invention, as the gas inside the gas ring is squeezed into the sealing ring, the gas simultaneously enters the sleeve inside the outer wall of the annular plate. As the gas pressure inside the sleeve gradually increases, it pushes the movable block inside to gradually move upward along the inner wall of the sleeve. The spring is compressed. When the movable block moves upward to contact the push switch on the inner wall of the top of the sleeve and forms a squeeze, the push switch is triggered to energize, causing the indicator light on the top of the sleeve to light up. This light signal is a visual indication that the seal is completely in place, indicating to the operator that the tightening force between the flanges has reached the standard and that the core seal and the outer gas pressure seal have formed a gapless seal. This avoids the error problem of traditional manual judgment of the sealing degree based on experience, making the sealing installation operation more precise and controllable, and reducing rework operations caused by inadequate sealing. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of a partial structure of the pipeline of the present invention; Figure 3 This is a partial structural diagram of the pipeline of the present invention; Figure 4 This is a partial structural diagram of the locking connecting rod of the present invention; Figure 5 This is a partial structural diagram of the annular plate of the present invention; Figure 6 This is a partial structural diagram of the metal spiral wound gasket of the present invention; Figure 7 for Figure 4 A magnified structural diagram at point A; Figure 8 for Figure 5 A magnified structural diagram at point B; Figure 9 for Figure 5 A magnified structural diagram at point C.

[0020] The components are as follows: 1. Pipe 1; 2. Pipe 2; 3. Flange 1; 4. Flange 2; 5. Spiral wound gasket; 6. PTFE gasket; 7. Hand lever; 8. Rotating ring; 9. Through port; 10. Arc-shaped convex plate; 11. Locking connecting rod; 12. Rod head; 13. Rectangular groove; 14. Pin; 15. Rotating baffle; 16. Limiting ring; 17. Positioning hole; 18. Limiting hole; 19. Locking bolt; 20. Sealing assembly; 2001. Gas ring; 2002. Extrusion plate; 2003. Sealing ring; 2004. Annular plate; 2005. Connecting pipe; 2006. Connecting hole; 2007. Sleeve; 2008. Movable block; 2009. Spring; 2010. Press switch; 2011. Indicator light. Detailed Implementation

[0021] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see the appendix Figure 1 -Appendix Figure 9 This invention provides a flange sealing structure for a polymerization reactor to prevent plastic blockage, including a pipe 1 and a pipe 2. A flange 3 and a flange 4 are respectively installed at opposite ends of pipe 1 and pipe 2. A spiral wound gasket 5 is provided on the opposite side of flange 3 and flange 4. The spiral wound gasket 5 includes an inner ring with an inner diameter D1 of 80mm, which is consistent with the diameter of the flange opening. A PTFE gasket 6 is provided at the inner ring of the spiral wound gasket 5. A limit ring 16 is fixedly connected to the outer wall of pipe 1. The outer wall is rotatably connected to a rotating ring 8. The interior of the rotating ring 8 is evenly provided with openings 9. An arc-shaped protrusion 10 is evenly fixedly connected to one side of the rotating ring 8. The positions of the arc-shaped protrusion 10 and the openings 9 correspond one-to-one. A handle 7 is evenly installed on one side of the rotating ring 8. A locking connecting rod 11 is provided in the mounting holes of flange 1 3 and flange 2 4. A rod head 12 is fixedly connected to one end of the locking connecting rod 11. A rectangular groove 13 is provided on the other end of the locking connecting rod 11. A sealing component 20 is provided on one side of flange 2 4.

[0023] Specifically, when the two pipes are connected and fixed by flanges, hold the handle 7 and rotate the rotating ring 8 on the outer wall of pipe 1 to make it rotate the arc-shaped protrusion 10. The protrusion of the arc-shaped protrusion 10 gradually comes into contact with and abuts the rod head 12, and then gradually pulls the locking connecting rod 11 to move. The locking connecting rod 11 drives the rotating baffle 15 to move gradually towards flange 2 4. By rotating the rotating ring 8, the locking force between flange 1 3 and flange 2 4 can be adjusted to ensure that the metal spiral wound gasket 5 and PTFE gasket 6 can fully and tightly fit with the flange sealing surface and eliminate the gap of the sealing surface. When the gasket and the flange sealing surface reach the best fit, insert the locking bolt 19 into the corresponding limit hole 18 and positioning hole 17 to fix the position of the rotating ring 8, thereby locking the flange locking force and realizing the connection and fixation of the two flanges. By optimizing the inner ring diameter of the metal spiral wound gasket 5 to 80mm, which perfectly matches the flange pipe diameter, the annular pre-reserved gap between the gasket and the pipe is eliminated, thus preventing the infiltration and accumulation of monomeric media from a spatial structure perspective. At the same time, a PTFE gasket 6 with a specification of φ99×90×1mm is attached to the inner ring. The PTFE gasket 6 is tightly fitted at the contact position between the inner ring and the flange pipe, forming a dual sealing structure of the main seal of the metal spiral wound gasket 5 and the auxiliary seal of the PTFE gasket 6. This fundamentally inhibits the polymerization reaction of monomeric media at the sealing part and solves the core problem of plastics clogging the pipeline. During the process of the rotating baffle 15 moving towards flange 24, the rotating baffle 15 will squeeze the extrusion plate 2002, the gas ring 2001 will be compressed, and the gas in the gas ring 2001 will enter the sleeve 2007 through the connecting pipe 2005, and then flow into the sealing ring 2003 through the connecting hole 2006, causing the sealing ring 2003 to expand under air pressure and tightly adhere to the outer wall of the flange, forming a pneumatic seal on the outer gap of the flange connection, blocking the medium leakage path from the outer wall of the flange. The adjustable locking structure, consisting of a rotating ring 8, an arc-shaped convex plate 10, a locking connecting rod 11, and a rotating baffle 15, allows for precise adjustment of the locking force between flanges according to actual working conditions. This ensures a tight, gapless fit between the core sealing gasket and the flange sealing surface, guaranteeing the main sealing effect. Simultaneously, the compression of the gas ring 2001 by the rotating baffle 15 during the locking process enables adaptive transmission of air pressure. This causes the sealing ring 2003 to expand under air pressure and adhere to the outer wall of the flange, forming an external air pressure seal. This provides all-around sealing protection from the inner mating surface of the flange to the outer wall, completely blocking the leakage path of the medium and effectively avoiding the safety hazards of leakage of high-risk media such as vinyl chloride. This enhances the sealing performance and safety of the equipment operation.

[0024] Please see the appendix Figure 2 Appendix Figure 4 -Appendix Figure 5 A rotating baffle 15 is provided in the rectangular groove 13 of the locking connecting rod 11. A limiting groove is provided in the middle of the rotating baffle 15. A pin 14 is installed at the end of the locking connecting rod 11 away from the rod head 12. The pin 14 is located in the limiting groove of the rotating baffle 15.

[0025] Specifically, rotating the rotating ring 8 forward causes the arc-shaped protrusion 10 to rotate. The protrusion of the arc-shaped protrusion 10 gradually comes into contact with and abuts against the pull rod head 12, thereby gradually pulling the locking connecting rod 11 to move. The locking connecting rod 11 drives the rotating baffle 15 to gradually move towards the flange 4. By adjusting the rotation amplitude of the rotating ring 8, the locking force between flange 3 and flange 4 can be adjusted to ensure that the metal spiral wound gasket 5 and PTFE gasket 6 can fully and tightly fit with the flange sealing surface, eliminating the gap between the sealing surfaces. When the gasket and the flange sealing surface reach the best fit, the locking bolt 19 is inserted into the corresponding limit hole 18 and positioning hole 17 to fix the position of the rotating ring 8, thereby locking the flange locking force and realizing the quick connection and fixation of the two flanges. During disassembly, the rotating ring 8 is rotated in the opposite direction, and the protrusion of the arc-shaped convex plate 10 gradually moves away from the rod head 12. The tension on the locking connecting rod 11 disappears, and the locking force on the flange mating surface is released. Then, the rotating baffle 15 is rotated to be parallel to the locking connecting rod 11, eliminating the interference resistance between the components and realizing the quick disassembly of the two flanges.

[0026] Please see the appendix Figure 1 Appendix Figure 3 -Appendix Figure 5 Appendix Figure 8 The limiting ring 16 has evenly spaced positioning holes 17 inside, and the bottom of the rotating ring 8 has evenly spaced positioning holes 18. A locking bolt 19 is provided in one of the positioning holes 18 of the rotating ring 8, and the outer wall of the locking bolt 19 is threaded into one of the positioning holes 17.

[0027] Specifically, after the gasket and flange sealing surface reach optimal contact, the locking bolt 19 is inserted into the corresponding limiting hole 18 and positioning hole 17 to fix the position of the rotating ring 8, thereby locking the flange tightening force and fixing the connection between the two flanges. During disassembly, unscrew the locking bolt 19, rotate the rotating ring 8 in the opposite direction, and the protrusion of the arc-shaped convex plate 10 gradually moves away from the rod head 12, the tension on the locking connecting rod 11 disappears, the locking force on the flange mating surface is released, and then rotate the rotating baffle 15 to be parallel to the locking connecting rod 11, eliminating the interference resistance between the components and realizing the quick disassembly of the two flanges.

[0028] Please see the appendix Figure 1 -Appendix Figure 2 Appendix Figure 5 Appendix Figure 9The sealing assembly 20 includes a gas ring 2001, one side of which is fixedly connected to one side of flange 24, and a compression plate 2002 is fixedly connected to the other side of the gas ring 2001. The sealing assembly 20 also includes a sealing ring 2003, the bottom of which is installed on the outer wall of flange 3 and flange 24, and an annular plate 2004 is fixedly connected to the outer wall of the sealing ring 2003. A connecting pipe 2005 is fixedly connected between the sealing ring 2003 and the gas ring 2001, and the top of the annular plate 2004 is open. A connecting hole 2006 is provided. A sleeve 2007 is fixedly connected to the outer wall of the annular plate 2004. A movable block 2008 is slidably connected inside the sleeve 2007. A spring 2009 is fixedly connected to the top of the movable block 2008. The top end of the spring 2009 is fixedly connected to the inner wall of the top end of the sleeve 2007. An indicator light 2011 is installed on the top of the sleeve 2007. A push switch 2010 is installed on the inner wall of the top end of the sleeve 2007. The indicator light 2011 and the push switch 2010 are electrically connected.

[0029] Specifically, during the process of the rotating baffle 15 moving towards flange 24, the rotating baffle 15 will squeeze the extrusion plate 2002, the gas ring 2001 will be compressed, and the gas in the gas ring 2001 will enter the sleeve 2007 through the connecting pipe 2005, and then flow into the sealing ring 2003 through the connecting hole 2006, causing the sealing ring 2003 to expand under air pressure and tightly adhere to the outer wall of the flange, forming a pneumatic seal on the outer gap of the flange connection, blocking the medium leakage path from the outer wall of the flange; During the process of the gas in the gas ring 2001 being squeezed into the sealing ring 2003, the gas simultaneously enters the sleeve 2007 on the outer wall of the annular plate 2004. As the gas pressure inside the sleeve 2007 gradually increases, it pushes the movable block 2008 inside to gradually move upward along the inner wall of the sleeve 2007, compressing the spring 2009. When the movable block 2008 moves upward to contact the push switch 2010 on the inner wall of the top of the sleeve 2007 and forms a squeeze, the push switch 2010 is triggered to energize, causing the indicator light 2011 on the top of the sleeve 2007 to light up. This light signal is a visual indication that the seal is completely in place, reminding the operator that the tightening force between the flanges has reached the standard and that the core seal and the outer gas pressure seal have formed a gapless seal. This avoids the error problem of traditional manual judgment of the sealing degree based on experience, making the sealing installation operation more precise and controllable, and reducing rework operations caused by inadequate sealing.

[0030] The method for processing and modifying the flange sealing structure of the polymerization reactor to prevent plastic blockage includes the following steps: When two pipes are connected and fixed by flanges, hold the handle 7 and rotate the rotating ring 8 on the outer wall of pipe 1 to make it rotate the arc-shaped protrusion 10. The protrusion of the arc-shaped protrusion 10 gradually comes into contact with and abuts the rod head 12, and then gradually pulls the locking connecting rod 11 to move. The locking connecting rod 11 drives the rotating baffle 15 to move gradually towards flange 2 4. By rotating the rotating ring 8, the locking force between flange 1 3 and flange 2 4 can be adjusted to ensure that the metal spiral wound gasket 5 and PTFE gasket 6 can fully and tightly fit with the flange sealing surface and eliminate the gap of the sealing surface. When the gasket and the flange sealing surface reach the best fit, insert the locking bolt 19 into the corresponding limit hole 18 and positioning hole 17 to fix the position of the rotating ring 8, thereby locking the flange locking force and realizing the connection and fixation of the two flanges. The inner ring diameter of the metal spiral wound gasket 5 is optimized to 80mm, which perfectly matches the flange pipe diameter, eliminating the annular pre-reserved gap between the gasket and the pipe, thus preventing the infiltration and accumulation of single media from a spatial structure perspective; at the same time, a PTFE gasket 6 with a specification of φ99×90×1mm is attached to the inner ring, and the PTFE gasket 6 is tightly fitted at the contact position between the inner ring and the flange pipe, forming a dual sealing structure of the main seal of the metal spiral wound gasket 5 and the auxiliary seal of the PTFE gasket 6; During the process of the rotating baffle 15 moving towards flange 24, the rotating baffle 15 will squeeze the extrusion plate 2002, the gas ring 2001 will be compressed, and the gas in the gas ring 2001 will enter the sleeve 2007 through the connecting pipe 2005, and then flow into the sealing ring 2003 through the connecting hole 2006, causing the sealing ring 2003 to expand under air pressure and tightly adhere to the outer wall of the flange, forming a pneumatic seal on the outer gap of the flange connection, blocking the medium leakage path from the outer wall of the flange. During the process of the gas in the gas ring 2001 being squeezed into the sealing ring 2003, the gas simultaneously enters the sleeve 2007 on the outer wall of the annular plate 2004. As the gas pressure inside the sleeve 2007 gradually increases, it will push the movable block 2008 inside to gradually move upward along the inner wall of the sleeve 2007. The spring 2009 is compressed. When the movable block 2008 moves upward to contact the push switch 2010 on the inner wall of the top of the sleeve 2007 and forms a squeeze, the push switch 2010 is triggered to energize, causing the indicator light 2011 on the top of the sleeve 2007 to light up. This light signal is a visual indication that the seal is completely in place, indicating to the operator that the locking force between the flanges has reached the standard and that the core seal and the outer gas pressure seal have formed a gapless sealing state. During disassembly, the rotating ring 8 is rotated in the opposite direction, and the protrusion of the arc-shaped convex plate 10 gradually moves away from the rod head 12. The tension on the locking connecting rod 11 disappears, and the locking force on the flange mating surface is released. Then, the rotating baffle 15 is rotated to be parallel to the locking connecting rod 11, eliminating the interference resistance between the components and realizing the quick disassembly of the two flanges.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flange sealing structure for a polymerization reactor to prevent plastic blockage, comprising a pipe one (1) and a pipe two (2), wherein a flange one (3) and a flange two (4) are respectively installed at opposite ends of the pipe one (1) and the pipe two (2), and a metal spiral wound gasket (5) is provided on opposite sides of the flange one (3) and the flange two (4), characterized in that: The metal spiral wound gasket (5) includes an inner ring with an inner diameter D1 of 80 mm, which is consistent with the diameter of the flange pipe opening. A PTFE gasket (6) is provided at the inner ring of the metal spiral wound gasket (5). A limit ring (16) is fixedly connected to the outer wall of the first pipe (1). A rotating ring (8) is rotatably connected to the outer wall of the first pipe (1). A through-hole (9) is uniformly opened inside the rotating ring (8). An arc-shaped protrusion (10) is uniformly fixedly connected to one side of the rotating ring (8). The positions of the arc-shaped protrusion (10) and the through-hole (9) correspond one-to-one. A hand rod (7) is uniformly installed on one side of the rotating ring (8). A locking connecting rod (11) is provided in the mounting holes of the first flange (3) and the second flange (4). A rod head (12) is fixedly connected to one end of the locking connecting rod (11). A rectangular groove (13) is opened at the other end of the locking connecting rod (11). A sealing component (20) is provided on one side of the second flange (4).

2. The anti-plastic clogging polymerization reactor flange sealing structure according to claim 1, characterized in that: A rotating baffle (15) is provided in the rectangular groove (13) of the locking connecting rod (11). A limiting groove is provided in the middle of the rotating baffle (15). A pin (14) is installed at the end of the locking connecting rod (11) away from the rod head (12). The pin (14) is located in the limiting groove of the rotating baffle (15).

3. The anti-plastic clogging polymerization reactor flange sealing structure according to claim 1, characterized in that: The limiting ring (16) has uniformly opened positioning holes (17) inside, and the bottom of the rotating ring (8) has uniformly opened limiting holes (18). A locking bolt (19) is provided in one of the limiting holes (18) of the rotating ring (8), and the outer wall of the locking bolt (19) is threadedly connected to one of the positioning holes (17).

4. The anti-plastic clogging polymerization reactor flange sealing structure according to claim 1, characterized in that: The sealing assembly (20) includes a gas ring (2001), one side of which is fixedly connected to one side of flange two (4), and the other side of which is fixedly connected to a compression plate (2002).

5. The anti-plastic clogging polymerization reactor flange sealing structure according to claim 1, characterized in that: The sealing assembly (20) also includes a sealing ring (2003), the bottom of which is installed on the outer wall of flange one (3) and flange two (4), and an annular plate (2004) is fixedly connected to the outer wall of the sealing ring (2003).

6. The anti-plastic clogging polymerization reactor flange sealing structure according to claim 5, characterized in that: A connecting pipe (2005) is fixedly connected between the sealing ring (2003) and the air ring (2001), and a connecting hole (2006) is provided on the top of the annular plate (2004).

7. The anti-plastic clogging polymerization reactor flange sealing structure according to claim 5, characterized in that: A sleeve (2007) is fixedly connected to the outer wall of the annular plate (2004), and a movable block (2008) is slidably connected inside the sleeve (2007).

8. The anti-plastic clogging polymerization reactor flange sealing structure according to claim 7, characterized in that: A spring (2009) is fixedly connected to the top of the movable block (2008), and the top end of the spring (2009) is fixedly connected to the inner wall of the top end of the sleeve (2007).

9. The anti-plastic clogging polymerization reactor flange sealing structure according to claim 7, characterized in that: An indicator light (2011) is installed on the top of the sleeve (2007), and a push switch (2010) is installed on the inner wall of the top of the sleeve (2007). The indicator light (2011) and the push switch (2010) are electrically connected.

10. A method for processing and modifying the flange sealing structure of a polymerization reactor to prevent plastic blockage, characterized in that: The flange sealing structure for preventing plastic blockage in polymerization reactors as described in any one of claims 1-9 comprises the following steps: When the two pipes are connected and fixed by flanges, hold the handle (7) and rotate the rotating ring (8) on the outer wall of pipe one (1) to make it rotate the arc-shaped convex plate (10). The convex part of the arc-shaped convex plate (10) gradually comes into contact with and abuts the rod head (12), and then gradually pulls the locking connecting rod (11) to move. The locking connecting rod (11) drives the rotating baffle (15) to move towards the flange two (4). By rotating the rotation amplitude of the rotating ring (8), the locking force between flange one (3) and flange two (4) can be adjusted to ensure that the metal spiral gasket (5) and PTFE gasket (6) can fully and tightly fit with the flange sealing surface and eliminate the gap of the sealing surface. When the gasket and the flange sealing surface reach the best fit, insert the locking bolt (19) into the corresponding limit hole (18) and positioning hole (17) to fix the position of the rotating ring (8) and lock the flange locking force to achieve the connection and fixation of the two flanges. The inner ring diameter of the metal spiral wound gasket (5) is optimized to 80mm, which is perfectly matched with the flange pipe diameter, eliminating the annular reserved gap between the gasket and the pipe, thus preventing the infiltration and accumulation of single media from the spatial structure; at the same time, a PTFE gasket (6) with a specification of φ99×90×1mm is attached to the inner ring. The PTFE gasket (6) is tightly fitted at the contact position between the inner ring and the flange pipe, forming a double sealing structure of the main seal of the metal spiral wound gasket (5) and the auxiliary seal of the PTFE gasket (6); During the process of the rotating baffle (15) moving towards flange 2 (4), the rotating baffle (15) will squeeze the extrusion plate (2002), the gas ring (2001) will be compressed, and the gas in the gas ring (2001) will enter the sleeve (2007) through the connecting pipe (2005), and then flow into the sealing ring (2003) through the connecting hole (2006), so that the sealing ring (2003) will expand under air pressure and tightly adhere to the outer wall of the flange, forming a pneumatic seal on the outer gap of the flange connection, blocking the medium leakage path from the outer wall of the flange; During the process of the gas in the gas ring (2001) being squeezed into the sealing ring (2003), the gas simultaneously enters the sleeve (2007) on the outer wall of the annular plate (2004). As the gas pressure inside the sleeve (2007) gradually increases, it will push the movable block (2008) inside to gradually move upward along the inner wall of the sleeve (2007). The spring (2009) is compressed. When the movable block (2008) moves upward to contact the push switch (2010) on the inner wall of the top of the sleeve (2007) and forms a squeeze, the push switch (2010) is triggered to energize, causing the indicator light (2011) on the top of the sleeve (2007) to light up. This light signal is a visual indication that the seal is completely in place, indicating to the operator that the locking force between the flanges has reached the standard and that the core seal and the outer gas pressure seal have formed a gapless sealing state. During disassembly, the rotating ring (8) is rotated in the opposite direction, and the protrusion of the arc-shaped convex plate (10) gradually moves away from the rod head (12). The tension on the locking connecting rod (11) disappears, and the locking force on the flange mating surface is released. Then, the rotating baffle (15) is rotated to be parallel to the locking connecting rod (11), eliminating the interference resistance between the components and realizing the rapid disassembly of the two flanges.

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