An on-line leak-stopping and repairing sealing device for large chemical pressure vessels

Abstract

The application discloses a large chemical pressure container on-line leak stopping overhauling sealing device, and relates to the field of overhauling sealing devices.The large chemical pressure container on-line leak stopping overhauling sealing device is characterized by the following: the arc pressure plate center arc bending structure is used to smoothly slide and advance along the inner arc frame inner wall under the driving of air pressure, the arc surface of the container can be attached, the leakage gap peripheral area can be compressed, the medium continuous leakage can be limited, the pre-leak stopping pressure stabilization effect can be realized, the fullness and the attachment of the subsequent sealing agent filling can be improved, the rubber frame pad arranged on the inner side of the inner arc frame can be tightly attached to the container outer wall, the assembly gap between the inner arc frame and the container wall can be eliminated, the closed independent operation cavity can be formed, the high-pressure gas outflow can be blocked, the cavity internal air pressure can be stabilized, and the closed operation environment can be created for the air pressure driving compression and the sealing agent filling.

Description

Technical Field

[0001] This invention specifically relates to an online leak sealing and maintenance device for large chemical pressure vessels, and pertains to the field of maintenance sealing devices. Background Technology

[0002] Chemical pressure vessels are core pressure-bearing equipment in chemical production processes. They operate under complex conditions of high temperature, high pressure, and corrosive media for extended periods. Seams, welds, and weak points on the outer wall of the equipment are prone to leakage. The media inside the pressure vessels are mostly flammable, explosive, and highly corrosive chemical raw materials. Once a leak occurs, it will not only cause loss of raw materials and reduce production efficiency, but also easily lead to safety accidents such as fire, explosion, environmental pollution, and burns to personnel, seriously threatening the stable operation of the chemical production line and the personal safety of the workers.

[0003] The device and method for online sealing of vacuum leaks in the inner cavity of pipelines, disclosed in CN101915337B, includes a pipeline with a vacuum leak in its inner cavity, and a siphon tube outside the pipeline. The siphon tube consists of a set of vertical pipes with two inlets and one outlet. One inlet is connected to a gas source, and the other inlet is connected to a high-vacuum microporous sealant bottle. The outlet of the siphon tube is connected to a transport pipe. The device also includes an industrial endoscope and a rigid plastic conduit. The probes of the transport pipe and the industrial endoscope are inserted into the vacuum leak in the pipeline through the rigid plastic conduit. This invention overcomes key technologies such as the selection of vacuum sealing solvents, nozzle positioning, conduit transport, remote atomization, and enhanced treatment within a large operating temperature range (-196~350℃). It is easy to operate and provides excellent sealing results. The "internal sealing" method of this invention can also serve as a "pretreatment" for key components and parts to enhance leak prevention.

[0004] In existing equipment, most online leak sealing devices are rigid bonding structures, which cannot be adapted to the curved surface structure of the outer wall of pressure vessels. The bonding gaps are large and the sealing performance is poor, which can easily lead to media leakage and sealing failure during the leak sealing process. Summary of the Invention

[0005] To address the aforementioned problems, a technical solution is proposed: an online leak-sealing and maintenance device for large chemical pressure vessels, comprising:

[0006] A seam pressing mechanism, wherein a locking mechanism is installed on one side of the seam pressing mechanism and an injection mechanism is installed on the other side of the seam pressing mechanism, and a fixing tube is installed at the end of the injection mechanism away from the seam pressing mechanism;

[0007] The material pump and the air pump are provided. The feed end of the material pump is connected to a sealant tank through a pipe, and the air outlet of the air pump is connected to the crimping mechanism through a pipe.

[0008] The sealing mechanism includes a sealing arc plate. The side of the sealing arc plate near the locking mechanism is a plate with a centrally recessed arc. An inner arc frame is fixedly installed on the arc surface of the sealing arc plate near the locking mechanism. An arc pressure plate is slidably installed on the inner wall of the inner arc frame. A vent pipe is fixedly installed on the side of the sealing arc plate away from the locking mechanism. One end of the vent pipe passes through the sealing arc plate and extends into the space between the sealing arc plate and the arc pressure plate. Through the arc-shaped bending structure at the center of the arc pressure plate, it slides smoothly along the inner wall of the inner arc frame under air pressure. It can fit the leaking arc surface of the container, press the area around the leaking gap, limit the continuous leakage of the medium, achieve a pre-seal pressure stabilization effect, and improve the fullness and fit of the subsequent sealant filling. A connecting pipe is fixedly installed at the other end of the vent pipe, and the vent pipe is connected to the air outlet of the air pump through the connecting pipe.

[0009] Preferably, each of the outer corners of the pressure plate has a column hole. The pressure plate is an arc-shaped plate that curves away from the locking mechanism from the center. A rubber frame pad is fixedly installed on the arc surface of the inner arc frame near the locking mechanism. The rubber frame pad on the inner side of the inner arc frame can fit tightly against the outer wall of the container, eliminating the assembly gap between the inner arc frame and the container wall, forming a sealed independent working cavity, preventing high-pressure gas from leaking out, ensuring stable air pressure inside the cavity, and creating a sealed working environment for air pressure-driven pressing and sealant filling. The inner wall of the rubber frame pad is flush with the inner wall of the inner arc frame.

[0010] Preferably, the injection mechanism includes an injection tube, an inner clamping sleeve is fixedly installed on the inner wall of the injection tube, one end of the injection tube near the pressure plate passes through the pressure plate and extends to the side of the pressure plate away from the pressure plate, the outer side of the injection tube slides and adapts to the inner wall of the pressure plate, and a limiting ring is fixedly installed on the outer end of the injection tube near the locking mechanism, the side of the limiting ring near the pressure plate is an arc surface, and the arc surface of the pressure plate away from the pressure plate is adapted to the arc surface of the limiting ring.

[0011] Preferably, a through-groove ring is fixedly installed on the inner wall of the inner cylinder at the end away from the locking mechanism. Through grooves are evenly opened on the outer side of the through-groove ring. The inner diameter of the inner cylinder gradually decreases as it approaches the through-groove ring. A connecting post is slidably installed on the inner wall of the through-groove ring. A disc is provided at the end of the connecting post away from the locking mechanism. An inner gasket is fixedly installed between the disc and the through-groove ring. The inner gasket, made of elastic material, can achieve adaptive elastic deformation. During high-pressure injection, it contracts under pressure to release the seal. After the injection stops, it automatically and elastically resets, driving the connecting post and the inner sealing post to quickly return to their original positions and close the injection channel, preventing the sealant from flowing back and ensuring sufficient sealant retention in the gap. This avoids sealing voids caused by backflow, which could lead to leakage failure. The inner gasket is made of elastic material. An inner sealing post is fixedly installed on the end of the connecting post near the locking mechanism. The outer diameter of the inner sealing post gradually increases as it moves away from the connecting post, and the outer side of the inner sealing post is adapted to the inner wall of the inner cylinder.

[0012] Preferably, the locking mechanism includes an arc-shaped retaining plate. The center of the arc-shaped retaining plate near the pressure seam arc plate is a concave arc surface. Studs are fixedly installed at the outer corners of the arc-shaped retaining plate. The end of the stud away from the arc-shaped retaining plate corresponds one-to-one with the stud hole of the pressure seam arc plate. A nut is threadedly connected to the outer end of the stud away from the arc-shaped retaining plate. An inner ring washer is engaged between the side of the nut near the arc-shaped retaining plate and the side of the pressure seam arc plate away from the arc-shaped retaining plate. The inner ring washer is made of elastic material.

[0013] Preferably, side pressure pads are fixedly installed on the curved surface of the arc-shaped clamping plate near the pressure joint arc plate. The side pressure pads are made of rubber and are symmetrically installed along the center of the arc-shaped clamping plate's axis. The arc-shaped clamping plate has symmetrically formed grooves near the center of the pressure joint arc plate. Inner sliding plates are slidably installed in each groove of the arc-shaped clamping plate. Inner rollers are rotatably installed between the inner sliding plates. A connecting plate is fixedly installed at the end of the inner sliding plate away from the pressure joint arc plate. Side sliding plates are fixedly installed at both ends of the connecting plate on the side away from the inner sliding plate. An outer baffle is fixedly installed at the center of one side of the pressure plate. The elastic inner pressure pad continuously outputs a pushing force, which drives the connecting plate and the inner slide plate to slide smoothly along the groove of the arc plate. This ensures that the inner roller always rolls and adapts to the outer wall of the pressure vessel, which can adapt to the curvature error of the vessel surface, ensure uniform force on the device, avoid the problem of local compression being too loose or too tight, and improve the stability and accuracy of locking and fitting. The inner wall of the outer baffle slides and adapts to the outer side of the side slide plate, and an inner pressure pad made of elastic material is fixedly installed between the connecting plate and the outer baffle.

[0014] This invention provides an online leak-sealing and maintenance device for large chemical pressure vessels, which has the following advantages:

[0015] (i) Through the arc-shaped bending structure at the center of the arc pressure plate, it slides smoothly along the inner wall of the inner arc frame under the push of air pressure. It can fit the leaking arc surface of the container, press the area around the leaking gap, limit the continuous leakage of the medium, achieve the pre-sealant pressure stabilization effect, and improve the fullness and fit of the subsequent sealant filling.

[0016] (ii) The rubber frame pads set on the inner side of the inner arc frame can fit tightly against the outer wall of the container, eliminating the assembly gap between the inner arc frame and the container wall, forming a sealed independent working cavity, preventing high-pressure gas from leaking out, ensuring stable air pressure inside the cavity, and creating a sealed working environment for air pressure-driven pressing and sealant filling.

[0017] (III) The inner gasket made of elastic material can achieve adaptive elastic deformation. When high pressure is applied, it contracts under pressure to release the seal. After the material is stopped, it automatically and elastically resets, driving the connecting column and the inner sealing column to quickly return to their original positions and close the injection channel, preventing the sealant from flowing back and ensuring that the sealant is sufficiently retained in the gap, thus avoiding the sealing voids caused by backflow and the failure of the sealing.

[0018] (iv) The elastic inner pressure pad continuously outputs the top thrust, which drives the connecting plate and the inner slide plate to slide smoothly along the arc plate groove, so that the inner roller always rolls and adapts to the outer wall of the pressure vessel. It can adapt to the curvature error of the vessel surface, ensure that the device is evenly pressed, avoid the problem of local compression being too loose or too tight, and improve the stability and precision of locking and bonding. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a side view of the overall structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the locking mechanism of the present invention;

[0022] Figure 4 This is a partial sectional view of the locking mechanism of the present invention;

[0023] Figure 5 This is a schematic diagram of the seam pressing mechanism of the present invention;

[0024] Figure 6 This is a sectional view of the seam pressing mechanism of the present invention;

[0025] Figure 7 This is a schematic diagram of the injection mechanism of the present invention;

[0026] Figure 8 This is a cross-sectional view of the injection mechanism of the present invention.

[0027] In the diagram: 1. Sealant tank; 2. Locking mechanism; 3. Sealing mechanism; 4. Injection mechanism; 5. Fixing pipe; 6. Material pump; 7. Air pump; 21. Arc clamping plate; 22. Stud; 23. Inner ring gasket; 24. Nut; 25. Inner roller; 26. Side pressure pad; 27. Inner sliding plate; 28. Outer cover; 29. ​​Side sliding plate; 210. Inner pressure pad; 211. Connecting plate; 31. Sealing arc plate; 32. Inner arc frame; 33. Rubber frame gasket; 34. Arc pressure plate; 35. Air guide pipe; 36. Connecting pipe; 41. Injection pipe; 42. Limiting ring; 43. Inner sealing column; 44. Through groove ring; 45. Inner clamping cylinder; 46. Inner gasket cylinder; 47. Connecting column. Detailed Implementation

[0028] Example 1, Reference Figures 1 to 2 and Figures 5 to 6 The present invention provides the following technical solution:

[0029] A large-scale chemical pressure vessel online leak sealing and maintenance sealing device includes:

[0030] The seam pressing mechanism 3 has a locking mechanism 2 installed on one side and an injection mechanism 4 installed on the other side. A fixing tube 5 is installed at the end of the injection mechanism 4 away from the seam pressing mechanism 3.

[0031] The material pump 6 and the air pump 7 are connected. The inlet end of the material pump 6 is connected to the sealant tank 1 through a pipe, and the outlet end of the air pump 7 is connected to the crimping mechanism 3 through a pipe.

[0032] The sealing mechanism 3 includes a sealing arc plate 31. The side of the sealing arc plate 31 closest to the locking mechanism 2 is a centrally located arc-shaped recessed plate. An inner arc frame 32 is fixedly installed on the arc surface of the sealing arc plate 31 closest to the locking mechanism 2. An arc pressure plate 34 is slidably installed on the inner wall of the inner arc frame 32. A vent pipe 35 is fixedly installed on the side of the sealing arc plate 31 furthest from the locking mechanism 2. One end of the vent pipe 35 passes through the sealing arc plate 31 and extends into the space between the sealing arc plate 31 and the arc pressure plate 34. After the locking mechanism 2 completes the locking and fixing, the sealing arc plate 31 fits against the leakage area of ​​the pressure vessel, and the inner arc frame 32 is positioned synchronously with the sealing arc plate 31. The side rubber frame pad 33 adheres to the surface of the container to form an independent sealed cavity. Then, the air pump 7 is started. The air outlet of the air pump 7 inputs compressed gas into the sealed space between the pressure plate 31 and the pressure plate 34 through the connecting pipe 36 and the air guide pipe 35. The air pressure inside the cavity increases, pushing the pressure plate 34 to slide and advance along the inner wall of the inner arc frame 32 towards the leaking gap of the pressure vessel. The arc structure of the pressure plate 34 adaptively fits the leaking arc surface of the container, pressing the area around the leaking gap, initially compacting the gap, and controlling the leakage of the medium. The other end of the air guide pipe 35 is fixedly installed with the connecting pipe 36, and the air guide pipe 35 is connected to the air outlet of the air pump 7 through the connecting pipe 36.

[0033] Column holes are provided at the outer corners of the pressure plate 31. The pressure plate 34 is an arc-shaped plate that curves away from the locking mechanism 2 from the center. A rubber frame gasket 33 is fixedly installed on the arc surface of the inner arc frame 32 near the locking mechanism 2. The rubber frame gasket 33 continuously maintains the seal between the inner arc frame 32 and the container wall, preventing high-pressure gas leakage, ensuring stable cavity gas pressure, and providing a sealed working environment for subsequent injection sealing. The inner wall of the rubber frame gasket 33 is flush with the inner wall of the inner arc frame 32.

[0034] Example 2, based on Example 1, with reference to Figures 7 to 8 The injection mechanism 4 includes an injection pipe 41, with an inner clamping cylinder 45 fixedly installed on the inner wall of the injection pipe 41. One end of the injection pipe 41 near the pressure plate 31 passes through the pressure plate 31 and extends to the side of the pressure plate 34 away from the pressure plate 31. The outer side of the injection pipe 41 slides and adapts to the inner wall of the pressure plate 34. A limit ring 42 is fixedly installed on the outer side of the injection pipe 41 near the locking mechanism 2. After the pressure mechanism 3 completes the gap pressing and positioning, it connects to the external supply pipeline through the fixed pipe 5, connecting the sealant delivery channel. In the initial state, the inner sealing column 43 fits against the inner wall of the inner clamping cylinder 45, blocking the injection pipe 41 channel to prevent impurities from entering the device and to prevent medium leakage when no sealant is injected. Subsequently, the material pump 6 starts, drawing... The sealant inside the sealant tank 1 is transported to the injection pipe 41 through the pipeline. The sealant pressure gradually increases, pushing the inner sealing column 43 to move away from the pressure joint mechanism 3. The inner sealing column 43 drives the connecting column 47 to slide along the inner wall of the through groove ring 44, squeezing the elastic inner pad 46, causing the inner pad 46 to shrink and deform, releasing the blockage of the injection pipe 41. The sealant passes through the through groove on the outside of the through groove ring 44 to the front end of the injection pipe 41, and extends through the injection pipe 41 to the port on the outside of the arc pressure plate 34, accurately injecting into the leaking gap of the pressure vessel. The side of the limiting ring 42 near the arc pressure plate 34 is arc-shaped, and the arc-shaped surface of the arc pressure plate 34 away from the pressure joint arc plate 31 is adapted to the arc-shaped surface of the limiting ring 42.

[0035] A through-groove ring 44 is fixedly installed on the inner wall of the inner clamping cylinder 45 at the end away from the locking mechanism 2. Through grooves are evenly opened on the outer side of the through-groove ring 44. The inner diameter of the inner clamping cylinder 45 gradually decreases as it approaches the through-groove ring 44. A connecting post 47 is slidably installed on the inner wall of the through-groove ring 44. A disc is provided at the end of the connecting post 47 away from the locking mechanism 2, and an inner pad cylinder 46 is fixedly installed between the disc and the through-groove ring 44. The inner pad cylinder 46 is made of elastic material. During the injection process, the limiting ring 42 on the outer side of the injection tube 41 is limited by its arc surface fitting against the arc pressure plate 34, thus restricting the advancement position of the injection tube 41. The pump 6 stops supplying material after injection, the pipeline pressure drops, the deformed inner gasket 46 elastically resets, pushing the connecting column 47 and the inner sealing column 43 back into position. The inner sealing column 43 re-fits the inner wall of the inner clamping cylinder 45, sealing the injection channel and preventing the sealant from flowing back. The inner sealing column 43 is fixedly installed at the end of the connecting column 47 near the locking mechanism 2. The outer diameter of the inner sealing column 43 gradually increases as it moves away from the connecting column 47, and the outer side of the inner sealing column 43 is adapted to the inner wall of the inner clamping cylinder 45.

[0036] Example 3, based on Examples 1 and 2, with reference to Figures 3 to 4 The locking mechanism 2 includes an arc-shaped locking plate 21. The center of the arc-shaped locking plate 21 near the pressure-sealing arc plate 31 is a concave arc surface. Studs 22 are fixedly installed at the outer corners of the arc-shaped locking plate 21. The end of the stud 22 away from the arc-shaped locking plate 21 corresponds one-to-one with the post hole of the pressure-sealing arc plate 31. A nut 24 is threadedly connected to the outer end of the stud 22 away from the arc-shaped locking plate 21. The arc-shaped locking plate 21 is fitted to the outside of the leaking location of the pressure vessel. The concave arc surface of the inner side of the arc-shaped locking plate 21 adapts to the arc-shaped outer wall of the pressure vessel, achieving initial positioning of the entire device. The studs 22 fixed at the corner of the clamping plate 21 are inserted into the stud holes at the outer corner of the pressing arc plate 31 to complete the assembly of the locking mechanism 2 and the pressing mechanism 3. The nut 24 is screwed on the outer end of the stud 22. The nut 24 squeezes the inner ring gasket 23, causing the elastic inner ring gasket 23 to deform under pressure and fill the gap between the pressing arc plate 31 and the nut 24 to achieve end face sealing. The inner ring gasket 23 is installed between the side of the nut 24 near the arc clamping plate 21 and the side of the pressing arc plate 31 away from the arc clamping plate 21. The inner ring gasket 23 is made of elastic material.

[0037] Side pressure pads 26 are fixedly installed on the curved surface of the arc plate 21 near the pressure joint arc plate 31. The side pressure pads 26 are made of rubber and are symmetrically installed along the center of the axis of the arc plate 21. The arc plate 21 has symmetrically opened plate grooves near the center of the pressure joint arc plate 31. Inner slide plates 27 are slidably installed in the plate grooves of the arc plate 21. Inner rollers 25 are rotatably installed between the inner slide plates 27. A connecting plate 211 is fixedly installed at the end of the inner slide plate 27 away from the pressure joint arc plate 31. During the locking process, the rubber side pressure pads 26 symmetrically installed on the inner side of the arc plate 21 are tightly attached to the outer wall of the pressure vessel. After the device is attached and positioned, the outer cover 28 limits the side sliding. Plate 29 restricts lateral displacement. The elastic inner pressure pad 210 continuously pushes the connecting plate 211, causing the inner slide plate 27 to slide along the groove of the arc clamping plate 21, so that the inner roller 25 rolls and adapts to the outer wall of the pressure vessel, adapting to the arc surface of the vessel, ensuring the uniformity and stability of the locking fit. Side slide plates 29 are fixedly installed at both ends of the connecting plate 211 on the side away from the inner slide plate 27. An outer cover 28 is fixedly installed at the center position of the arc clamping plate 21 on the side away from the pressure seam arc plate 31. The inner wall of the outer cover 28 slides and adapts to the outer side of the side slide plate 29. An inner pressure pad 210 is fixedly installed between the connecting plate 211 and the outer cover 28. The inner pressure pad 210 is made of elastic material.

[0038] In the pressure joint mechanism 3, after the locking mechanism 2 completes the locking and fixing, the pressure joint arc plate 31 fits against the leakage area of ​​the pressure vessel, the inner arc frame 32 is positioned synchronously with the pressure joint arc plate 31, and the inner rubber frame pad 33 fits against the surface of the container to form an independent sealed cavity. Then, the air pump 7 is started. The air outlet of the air pump 7 inputs compressed gas into the sealed space between the pressure joint arc plate 31 and the arc pressure plate 34 through the connecting pipe 36 and the air guide pipe 35. The air pressure inside the cavity increases, pushing the arc pressure plate 34 to slide and advance along the inner wall of the inner arc frame 32 towards the leakage gap of the pressure vessel. The arc structure of the arc pressure plate 34 adaptively fits the leakage arc surface of the container, pressing the area around the leakage gap, initially compacting the gap, and controlling the leakage of the medium. The rubber frame pad 33 continuously maintains the sealing between the inner arc frame 32 and the container wall, preventing high-pressure gas leakage, ensuring the stability of the cavity air pressure, and providing a sealed working environment for subsequent injection sealing.

[0039] In the locking mechanism 2, the arc-shaped clamping plate 21 is attached to the outside of the leaking position of the pressure vessel. The concave arc surface on the inner side of the arc-shaped clamping plate 21 adapts to the arc-shaped outer wall of the pressure vessel, achieving the initial positioning of the entire device. The studs 22 fixed at the corners of the arc-shaped clamping plate 21 are inserted into the corresponding stud holes at the outer corners of the pressure-sealing arc plate 31, completing the assembly of the locking mechanism 2 and the pressure-sealing mechanism 3. The nut 24 is screwed on the outer end of the stud 22. The nut 24 compresses the inner ring washer 23, causing the elastic inner ring washer 23 to deform under pressure and fill the pressure-sealing arc plate. The gap between 31 and nut 24 achieves end face sealing. During the locking process, the rubber side pressure pads 26 symmetrically installed on the inner side of the arc plate 21 are tightly attached to the outer wall of the pressure vessel. After the device is attached and positioned, the outer cover 28 limits the side slide plate 29 to restrict lateral displacement. The elastic inner pressure pad 210 continuously pushes the connecting plate 211, causing the inner slide plate 27 to slide along the groove of the arc plate 21, so that the inner roller 25 rolls and adapts to the outer wall of the pressure vessel, adaptively fitting the arc surface of the vessel, ensuring the uniformity and stability of the locking and fitting.

[0040] In the injection mechanism 4, after the crimping mechanism 3 completes the crimping and positioning of the gap, it connects to the external supply pipeline through the fixed pipe 5, thus connecting the sealant delivery channel. In the initial state, the inner sealing column 43 fits against the inner wall of the inner clamping cylinder 45, blocking the injection pipe 41 channel to prevent impurities from entering the device and to prevent leakage of the medium when no sealant is injected. Subsequently, the material pump 6 starts, drawing sealant from the sealant tank 1 and delivering it to the injection pipe 41 through the pipeline. The sealant pressure gradually increases, pushing the inner sealing column 43 to move away from the crimping mechanism 3. The inner sealing column 43 drives the connecting column 47 to slide along the inner wall of the through groove ring 44, squeezing the elastic inner pad cylinder 46, causing the inner pad cylinder 46 to shrink and deform, thus releasing the seal of the injection pipe 41. In the blocked state, the sealant passes through the groove on the outside of the through-groove ring 44 to the front end of the injection pipe 41, and extends through the injection pipe 41 to the port on the outside of the arc pressure plate 34, and is precisely injected into the leaking gap inside the pressure vessel. During the injection process, the limiting ring 42 on the outside of the injection pipe 41 fits against the arc pressure plate 34 through the arc surface to limit the pushing displacement of the injection pipe 41, avoid the injection pipe 41 from excessively pressing against the container wall, and at the same time ensure that the injection port is always aligned with the leaking gap. After the injection is completed, the material pump 6 stops supplying material, the pipeline pressure drops, the deformed inner gasket 46 elastically resets, pushes the connecting column 47 and the inner sealing column 43 back to their original positions, and the inner sealing column 43 re-fits against the inner wall of the inner clamping cylinder 45 to seal the injection channel and prevent the sealant from flowing back.

Claims

1. A sealing device for online leak sealing and maintenance of large chemical pressure vessels, characterized in that, include: A seam pressing mechanism (3) is provided with a locking mechanism (2) on one side and an injection mechanism (4) on the other side. A fixing tube (5) is provided at the end of the injection mechanism (4) away from the seam pressing mechanism (3). The material pump (6) and the air pump (7) are connected to the sealing agent tank (1) through a pipe at the inlet end of the material pump (6) and the air outlet end of the air pump (7) is connected to the seam pressing mechanism (3) through a pipe. The seam pressing mechanism (3) includes a seam pressing arc plate (31). The side of the seam pressing arc plate (31) near the locking mechanism (2) is a plate with a central arc-shaped depression. An inner arc frame (32) is fixedly installed on the arc surface of the seam pressing arc plate (31) near the locking mechanism (2). An arc pressure plate (34) is slidably installed on the inner wall of the inner arc frame (32). An air guide pipe (35) is fixedly installed on the side of the seam pressing arc plate (31) away from the locking mechanism (2). One end of the air guide pipe (35) passes through the seam pressing arc plate (31) and extends into the space between the seam pressing arc plate (31) and the arc pressure plate (34). A connecting pipe (36) is fixedly installed on the other end of the air guide pipe (35). The air guide pipe (35) is connected to the air outlet of the air pump (7) through the connecting pipe (36).

2. The online leak-sealing and maintenance sealing device for large chemical pressure vessels according to claim 1, characterized in that: The outer corners of the pressure plate (31) are provided with column holes, and the arc pressure plate (34) is an arc-shaped plate that is curved away from the locking mechanism (2) at the center. A rubber frame pad (33) is fixedly installed on the arc surface of the inner arc frame (32) near the locking mechanism (2), and the inner wall of the rubber frame pad (33) is flush with the inner wall of the inner arc frame (32).

3. The online leak-sealing and maintenance sealing device for large chemical pressure vessels according to claim 2, characterized in that: The injection mechanism (4) includes an injection tube (41), and an inner clamp (45) is fixedly installed on the inner wall of the injection tube (41). The end of the injection tube (41) near the jointing arc plate (31) passes through the jointing arc plate (31) and extends the arc plate (34) away from the side of the jointing arc plate (31).

4. The online leak sealing and maintenance device for large chemical pressure vessels according to claim 3, characterized in that: The outer side of the injection tube (41) is slidably adapted to the inner wall of the arc pressure plate (34), and a limiting ring (42) is fixedly installed on the outer side of the injection tube (41) near the locking mechanism (2). The side of the limiting ring (42) near the arc pressure plate (34) is an arc surface, and the arc surface of the arc pressure plate (34) away from the pressure plate (31) is adapted to the arc surface of the limiting ring (42).

5. The online leak sealing and maintenance device for large chemical pressure vessels according to claim 4, characterized in that: A through groove ring (44) is fixedly installed on the inner wall of the inner cylinder (45) away from the locking mechanism (2). Through grooves are evenly opened on the outer side of the through groove ring (44). The inner diameter of the inner cylinder (45) gradually decreases as it approaches the through groove ring (44).

6. The online leak-sealing and maintenance sealing device for large chemical pressure vessels according to claim 5, characterized in that: A connecting post (47) is slidably installed on the inner wall of the through groove ring (44). A disc is provided at the end of the connecting post (47) away from the locking mechanism (2), and an inner pad (46) is fixedly installed between the disc and the through groove ring (44). The inner pad (46) is made of elastic material. An inner sealing post (43) is fixedly installed at the end of the connecting post (47) near the locking mechanism (2). The outer diameter of the inner sealing post (43) gradually increases as it moves away from the connecting post (47), and the outer side of the inner sealing post (43) is adapted to the inner wall of the inner clamping cylinder (45).

7. The online leak sealing and maintenance device for large chemical pressure vessels according to claim 6, characterized in that: The locking mechanism (2) includes an arc plate (21). The center of the arc plate (21) near the seam pressing arc plate (31) is a concave arc surface. Studs (22) are fixedly installed at the outer corners of the arc plate (21). The end of the stud (22) away from the arc plate (21) corresponds one-to-one with the post hole of the seam pressing arc plate (31).

8. The online leak sealing and maintenance device for large chemical pressure vessels according to claim 7, characterized in that: The stud (22) is threaded with a nut (24) at one end away from the arc plate (21). An inner ring washer (23) is snapped between the side of the nut (24) near the arc plate (21) and the side of the pressure arc plate (31) away from the arc plate (21). The inner ring washer (23) is made of elastic material.

9. A sealing device for online leak sealing and maintenance of large chemical pressure vessels according to claim 8, characterized in that: Side pressure pads (26) are fixedly installed on the curved surface of the arc plate (21) near the pressure joint arc plate (31). The side pressure pads (26) are made of rubber and are symmetrically installed along the center of the axis of the arc plate (21). The arc plate (21) has symmetrically opened plate grooves near the center of the pressure joint arc plate (31). Inner slide plates (27) are slidably installed in the plate grooves of the arc plate (21). Inner rollers (25) are rotatably installed between the inner slide plates (27).

10. A sealing device for online leak sealing and maintenance of large chemical pressure vessels according to claim 9, characterized in that: A connecting plate (211) is fixedly installed at one end of the inner sliding plate (27) away from the pressure joint arc plate (31). Side sliding plates (29) are fixedly installed at both ends of the connecting plate (211) away from the inner sliding plate (27). An outer cover (28) is fixedly installed at the center of the arc plate (21) away from the pressure joint arc plate (31). The inner wall of the outer cover (28) slides and adapts to the outer side of the side sliding plate (29). An inner pressure pad (210) is fixedly installed between the connecting plate (211) and the outer cover (28). The inner pressure pad (210) is made of elastic material.

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