Multilayer composite lining press for hydrogen embrittlement resistant austenitic stainless steel pipe

Abstract

This invention relates to the field of composite pipe forming technology and discloses a multi-layer composite lining pressing device for hydrogen embrittlement-resistant austenitic stainless steel pipes. The device includes a machine base with several support platforms fixedly connected to the top. Two water injection chambers are also fixedly connected to the top of the machine base, with water outlets on opposite sides of each chamber. This invention utilizes the fact that the diameter of the fixed flange is smaller than the inner diameter of the composite lining, and the thickness of the rubber membrane is also smaller than the diameter of the composite lining. Therefore, the fixed flange will not contact the composite lining when entering or exiting the pipe. This effectively prevents the problem of defects in the composite lining in the middle section of the pipe caused by the conventional frustum-shaped plugs used to seal the pipe ends. These defects result in poor adhesion between the composite lining and the inner wall of the outer pipe during pressing, reducing the overall forming quality of the pipe.

Description

Technical Field

[0001] This invention relates to the field of composite pipe forming technology, specifically to a multi-layer composite lining pressing device for hydrogen embrittlement resistant austenitic stainless steel pipes. Background Technology

[0002] Currently, most multi-layer composite linings for pipelines are pressed using a hydraulic composite method. The tightness of the fit between the composite lining pipe and the outer base pipe can be achieved through two processes: hydraulic expansion loading and unloading. By using plugs to block both ends of the pipeline, the water pressure inside the pipeline increases, achieving hydraulic expansion and deformation. By controlling the water pressure, the lining pipe and the outer base pipe expand and deform, causing the lining pipe and the outer base pipe to form a mechanical interlock. Subsequent processes ensure that the two are tightly bonded together.

[0003] When using conventional frustum-shaped plugs to seal the pipe ends, the frustum-shaped plugs will first exert radial and axial pressure on the composite lining during the axial tightening process. This forces the composite lining layers on both sides of the pipe to be squeezed towards the middle along the pipe axis. As a result, the composite lining in the middle section of the pipe is prone to local wrinkles, interlayer misalignment, and radial bulging defects. Consequently, the composite lining and the inner wall of the outer pipe do not fit tightly during the pressing process, reducing the overall forming quality of the pipe. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a multi-layer composite lining pressing device for hydrogen embrittlement resistant austenitic stainless steel pipes, including a machine base, several support platforms fixedly connected to the top of the machine base, and two water injection chambers fixedly connected to the top of the machine base. Each of the two water injection chambers has a water outlet on its opposite side. The device also includes: The fixing mechanism is fixedly installed on the outer wall of the water injection tank. The sealing mechanism is fixedly installed on the outer wall of the fixed mechanism on the side away from the water injection tank. The water-passing mechanism is fixedly installed on the inner wall of the fixed mechanism on the side away from the water injection chamber; The process involves placing a composite liner inside the pipe, with a small gap between the liner and the inner wall of the pipe. The pipe is then placed on a support platform, which has three supports to hold the pipe in place. A pressure device is installed above the support platform to hold the pipe in place. Finally, plugs are used to seal both ends of the pipe.

[0005] Preferably, the fixing mechanism includes: The water supply component is fixedly installed on the outer wall of the water injection chamber on the side away from the water outlet. A movable component is slidably disposed on the inner wall of the water-passing component; The water outlet is connected to the pressurizer. The pressurizer injects water into the water injection chamber, which then flows into the pipe, pressurizing the pipe and causing the composite lining to expand and fit the inner wall of the pipe.

[0006] Preferably, the sealing mechanism includes: The elastic component is fixedly installed on the outer wall of the water-passing component on the side away from the water injection chamber. The flow passage component is located on the inner wall of the water passage component on the side away from the water injection chamber; The elastic component is used for sealing, and the flow-through component is used to fix the water-passing mechanism.

[0007] Preferably, the water circulation mechanism includes: A unidirectional component is fixedly installed on the inner wall of the flow-through component; The flow-reducing component is fixedly installed on the inner wall of the flow-passing component; Among them, the unidirectional component is used for water inlet and outlet inside the elastic component, and the drainage component prevents the elastic component from over-expanding.

[0008] Preferably, the water supply assembly includes several fixed flanges fixedly connected to the side of the water injection chamber away from the water outlet, and the outer walls of the several fixed flanges are all fixedly connected to limit rings, and the inner walls of the several fixed flanges away from the limit rings are fixedly connected to fixed plates. The limiting ring and the fixing plate are coaxial, and the fixing flange is connected to the water injection chamber.

[0009] Preferably, the moving component includes a slider that is slidably connected to the inner wall of the limiting ring, a spring that is fixedly connected to the outer wall of the slider, and a sealing ring that is fixedly connected to the outer wall of the slider. The side of the spring furthest from the slider is fixedly connected to the fixed flange, and the sealing ring is located on the side of the slider furthest from the spring.

[0010] Preferably, the elastic component includes a water droplet groove one formed on the outer wall of the slider, a water droplet groove two formed on the outer wall of the fixed flange away from the slider, a rubber membrane fixedly connected to the inner wall of the water droplet groove one, and two metal ribs fixedly connected to the inner wall of the rubber membrane. The side of the rubber membrane furthest from the first water droplet groove is fixedly connected to the second water droplet groove. Two metal ribs are close to the first and second water droplet grooves respectively. The two rubber membranes are not connected together. The rubber membrane material is silicone rubber.

[0011] Preferably, the flow-through assembly includes several fixing grooves 1 formed on the side of the fixed flange away from the slider, and several fixing grooves 2 formed on the outer wall of the fixed flange; There are fourteen fixing slots in the first type, which are divided into two groups. Each group of fixing slots is arranged in a circular array. The two groups of fixing slots are arranged in a mirror image around the fixing plate. There are three fixing slots in the second type, and all three fixing slots in the second type are located on the side of the fixing plate away from the spring.

[0012] Preferably, the unidirectional component includes a fixing ring fixedly connected to the inner wall of the fixing groove, a movable plug is provided inside the fixing ring, and a stop block is fixedly connected to the inner wall of the fixing ring. Among them, the side of the fixed ring away from the gear block is designed with a narrow opening, so that the moving plug cannot pass through the narrow opening of the fixed ring and pass over the gear block.

[0013] Preferably, the drainage assembly includes a fixed ring two fixedly connected to the inner wall of the fixed groove two, two stop blocks two fixedly connected to the inner wall of the fixed ring two, a rubber ring fixedly connected to the middle inner wall of the fixed ring two, and a movable plug two provided inside the fixed ring two. Among them, the movable plug 2 moves within the fixed ring 2 and is restricted by the two stop blocks 2, so it will not fall out of the fixed ring 1. The rubber ring is made of hard rubber, and the movable plug 2 will fit against the rubber ring.

[0014] The present invention has the following beneficial effects: (1) The present invention utilizes the fact that the diameter of the fixed flange is smaller than the inner diameter of the composite liner, and the thickness of the rubber film is also smaller than the diameter of the composite liner. Therefore, the fixed flange will not contact the composite liner when entering and exiting the pipeline. Through the application of the above components, it effectively prevents the situation where the conventional frustum plug is used to seal the pipe ends. In the process of axial tightening, the frustum plug will first exert radial and axial double pressure on the composite liner, forcing the composite liner layers on both sides of the pipeline to be squeezed towards the middle part along the pipe axis. As a result, the composite liner in the middle section of the pipeline is prone to local wrinkles, interlayer displacement and radial bulging defects, which in turn leads to the composite liner and the inner wall of the outer pipe not being tightly bonded during the pressing process, thus reducing the overall forming quality of the pipeline.

[0015] (2) The present invention utilizes the feature of the fixed flange entering the pipeline of the above-mentioned equipment. The water inflow and outflow between the fixed flange and the rubber membrane are large, thereby the water pressure between the fixed flange and the rubber membrane continuously increases, which rapidly expands the rubber membrane. The rubber membrane adheres to the inner wall of the composite lining and increases the contact area with the composite lining. Through the application of the above-mentioned components, the problem of needing to connect an additional air-filling pipe to inflate the self-tightening sealing ring when using conventional plugs, which affects the continuity of operation, is effectively prevented.

[0016] (3) The present invention utilizes the feature of the rubber membrane of the above-mentioned device being tightly attached to the composite liner. When the outer tube is expanded, the rubber membrane is able to contact the inner wall of the composite liner because the internal water pressure is basically equal to the water pressure inside the pipe. There is no need to further squeeze the plug, and it can directly adapt to the expanded pipe diameter. Furthermore, due to the expandable feature of the rubber membrane, the rubber membrane can closely contact the inner wall of the composite liner even when facing pipes with larger diameters. Through the application of the above-mentioned components, the problem of the outer tube becoming slightly larger due to pressure squeezing, and the plug further squeezing the pipe openings on both sides of the pipe, causing the outer tube to deform in a way that is difficult to recover, resulting in the length of the pipe cut off at both ends becoming longer, is effectively prevented. At the same time, the adaptability of the device to pipes of different specifications is improved.

[0017] (4) This invention utilizes the expansion characteristics of the rubber membrane in the above-mentioned equipment. By setting the first and second water droplet grooves into a teardrop shape, when the rubber membrane expands and the end is pulled, it is restricted by the first and second water droplet grooves. At this time, the rubber membrane is difficult to detach from the fixed position. Furthermore, due to the restriction of the metal ribs on both sides of the rubber membrane, the rubber membrane can only expand from the position where the two metal ribs are not connected. Through the application of the above components, the problem of the rubber breaking from the position where it is connected to the metal due to excessive pressure when it is connected to the metal by vulcanization is effectively prevented. At the same time, it also prevents the rubber membrane from being restricted by the pipe during sealing, causing the rubber membrane to expand to both sides and exceed its bearing limit, resulting in rupture. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the overall structure of the present invention; Figure 4 This is a schematic cross-sectional view of a partial structure of the present invention; Figure 5 This is a cross-sectional schematic diagram of the fixing mechanism of the present invention; Figure 6 This is a cross-sectional schematic diagram of the fixing mechanism of the present invention; Figure 7 For the present invention Figure 6 A magnified structural diagram of A in the middle; Figure 8 This is a schematic diagram of the fixing mechanism of the present invention; Figure 9 This is a schematic cross-sectional view of the elastic component of the present invention; Figure 10 For the present invention Figure 9 A magnified structural diagram of B in the diagram; Figure 11 This is a schematic cross-sectional view of the bleed-out component of the present invention; Figure 12 This is a schematic cross-sectional view of the unidirectional component of the present invention.

[0020] The attached diagram lists the components represented by each number as follows: In the diagram: 1. Fixed mechanism; 11. Water supply assembly; 12. Moving assembly; 13. Machine base; 14. Support platform; 15. Water inlet; 16. Outlet; 111. Fixed flange; 112. Limiting ring; 113. Fixed plate; 121. Slider; 122. Spring; 123. Sealing ring; 2. Sealing mechanism; 21. Elastic assembly; 22. Flow assembly; 211. Water droplet groove one; 212. Water droplet groove two; 213. Rubber membrane; 214. Metal rib; 221. Fixed groove one; 222. Fixed groove two; 3. Water supply mechanism; 31. One-way assembly; 32. Drainage assembly; 311. Fixed ring one; 312. Moving plug one; 313. Stop block one; 321. Fixed ring two; 322. Stop block two; 323. Rubber ring; 324. Moving plug two. Detailed Implementation

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

[0022] Example 1, please refer to Figures 1-6 This invention relates to a multi-layer composite lining pressing device for hydrogen-embrittled austenitic stainless steel pipes, comprising a machine base 13, with several support platforms 14 fixedly connected to the top of the machine base 13, and two water injection chambers 15 fixedly connected to the top of the machine base 13. Each of the two water injection chambers 15 has a water outlet 16 on its opposite side. The device also includes: Fixing mechanism 1 is fixedly installed on the outer wall of the water injection chamber 15; Sealing mechanism 2 is fixedly installed on the outer wall of the fixing mechanism 1 on the side away from the water injection tank 15; Water supply mechanism 3 is fixedly installed on the inner wall of the fixed mechanism 1 on the side away from the water injection chamber 15; The pipeline is lined with a composite liner, and there is a small gap between the liner and the inner wall of the pipeline. The pipeline is placed on a support platform 14. There are three support platforms 14 to support the pipeline. A compression device is set on the top of the support platform 14 to press the pipeline and keep it fixed. Then, the end caps are used to block both ends of the pipeline.

[0023] Fixed mechanism 1 includes: Water supply component 11 is fixedly installed on the outer wall of the water injection chamber 15 on the side away from the water outlet 16; The movable component 12 is slidably disposed on the inner wall of the water-passing component 11; The water outlet 16 is connected to the pressurizer. The pressurizer injects water into the water injection chamber 15, which then flows into the pipe, pressurizing the pipe and causing the composite lining to expand and fit the inner wall of the pipe.

[0024] Sealing mechanism 2 includes: Elastic component 21 is fixedly installed on the outer wall of the water-passing component 11 on the side away from the water injection chamber 15; The flow-through component 22 is located on the inner wall of the water-through component 11 on the side away from the water injection chamber 15; Among them, the elastic component 21 is used for sealing, and the flow-through component 22 is used to fix the water-passing mechanism 3.

[0025] Water supply mechanism 3 includes: One-way component 31, which is fixedly disposed on the inner wall of flow component 22; The flow-out component 32 is fixedly installed on the inner wall of the flow-through component 22; Among them, the one-way component 31 is used for water inlet and outlet inside the elastic component 21, and the drainage component 32 prevents the elastic component 21 from over-expanding.

[0026] Example 2, please refer to Figures 2-12 The present invention is a multi-layer composite inner lining pressing device for hydrogen embrittlement resistant austenitic stainless steel pipes. Based on Example 1, the water supply component 11 includes several fixed flanges 111 fixedly connected to the side of the water injection chamber 15 away from the water outlet 16. The outer walls of the several fixed flanges 111 are all fixedly connected to limit rings 112, and the inner walls of the several fixed flanges 111 away from the limit rings 112 are fixedly connected to a fixing plate 113. The limiting ring 112 is coaxial with the fixing plate 113, and the fixing flange 111 is connected to the water injection chamber 15.

[0027] The moving component 12 includes a slider 121 that is slidably connected to the inner wall of the limiting ring 112, a spring 122 that is fixedly connected to the outer wall of the slider 121, and a sealing ring 123 that is fixedly connected to the outer wall of the slider 121. The side of the spring 122 away from the slider 121 is fixedly connected to the fixed flange 111, and the sealing ring 123 is located on the side of the slider 121 away from the spring 122.

[0028] The elastic component 21 includes a water droplet groove 211 formed on the outer wall of the slider 121, a water droplet groove 212 formed on the outer wall of the fixed flange 111 away from the slider 121, a rubber membrane 213 fixedly connected to the inner wall of the water droplet groove 211, and two metal ribs 214 fixedly connected to the inner wall of the rubber membrane 213. Among them, the side of the rubber membrane 213 away from the first water droplet 211 is fixedly connected to the second water droplet 212, and the two metal ribs 214 are close to the first water droplet 211 and the second water droplet 212 respectively. The two rubber membranes 213 are not connected together, and the material of the rubber membrane 213 is silicone rubber.

[0029] The flow assembly 22 includes several fixing grooves 221 formed on the side of the fixed flange 111 away from the slider 121, and several fixing grooves 222 formed on the outer wall of the fixed flange 111. Among them, there are fourteen fixing slots 221, which are divided into two groups. Each group of fixing slots 221 is arranged in a circular array. The two groups of fixing slots 221 are arranged in a mirror image around the fixing plate 113. There are three fixing slots 222, and the three fixing slots 222 are located on the side of the fixing plate 113 away from the spring 122. As the water injection chamber 15 moves towards both sides of the pipe and the pipe openings on both sides are blocked with plugs, the inside of the pipe is pressurized. After pressurization and maintaining the pressure for a period of time, the pressure is then released. Figure 8 As shown, at this time, the water pressure on the left side of the fixed plate 113 is the water pressure inside the pipe, while the water pressure on the right side of the fixed plate 113 is continuously decreasing. Due to the pressure difference, the water flow on the left side of the fixed plate 113 flows along the fixed ring 311 into the space between the rubber diaphragm 213 and the fixed flange 111, and is discharged to the right through the fixed ring 311 on the right side of the fixed plate 113. Since there are seven fixed grooves 221 on both sides of the fixed plate 113, there are also seven fixed rings 311 on both sides of the fixed plate 113. Of the seven fixed rings 311 on the left side of the fixed plate 113, three are oriented in the opposite direction to the other four, meaning three fixed rings 311 are oriented as shown in the diagram. Figure 8 The F state in the diagram, and the other four states are presented as follows: Figure 8 In the state of G, that is, the stop block 313 faces the inner wall of the fixed flange 111, when the water flows through it... Figure 8 In the state of F, such as Figure 12 As shown, water flows in from the narrow opening above the fixed ring 311, pushing the moving plug 312 to press against the stop block 313. At this time, the water can flow smoothly from top to bottom, that is, the water can flow smoothly from the inner wall of the fixed flange 111 to the outer wall. When the water flows through... Figure 8 When in the state of G.

[0030] The one-way component 31 includes a fixed ring 311 fixedly connected to the inner wall of the fixed groove 221, a movable plug 312 is provided inside the fixed ring 311, and a stop block 313 is fixedly connected to the inner wall of the fixed ring 311. Among them, the side of the fixed ring 311 away from the stop block 313 has a narrow opening design, so the moving plug 312 cannot pass through the narrow opening of the fixed ring 311 and pass over the stop block 313. like Figure 12 As shown, the water flows from bottom to top, pushing the moving plug 312 upwards and blocking the narrow opening above the fixing ring 311. This makes it difficult for the water to flow from bottom to top, i.e., it makes it difficult for the water to flow from the inner wall of the fixing flange 111 to the outer wall. Therefore, when the water flows from the inner wall of the fixing flange 111 to the gap between the fixing flange 111 and the rubber diaphragm 213, four openings allow water to flow out. The situation is reversed for the fixing rings 311 on both sides of the fixing plate 113, i.e., four fixing rings 311 appear as shown... Figure 8 In the state of F, the three fixed rings 311 present as follows Figure 8 In state G, the water flow between the fixed flange 111 and the rubber membrane 213 has only 3 outlets flowing to the inner wall of the fixed flange 111. At this time, the water inflow between the fixed flange 111 and the rubber membrane 213 is greater than the water outflow.

[0031] The drainage assembly 32 includes a fixed ring 321 fixedly connected to the inner wall of the fixed groove 222. Two stop blocks 322 are fixedly connected to the inner wall of the fixed ring 321. A rubber ring 323 is fixedly connected to the middle inner wall of the fixed ring 321. A movable plug 324 is provided inside the fixed ring 311. Among them, the movable plug 324 moves within the fixed ring 321 and is restricted by the two stop blocks 322, so it will not fall out of the fixed ring 311. The rubber ring 323 is made of hard rubber, and the movable plug 324 will fit against the rubber ring 323. As the pressure in the space between the fixed flange 111 and the rubber diaphragm 213 continuously increases, such as Figure 11As shown, at this time, the water flows in from below, and the second movable plug 324 will be tightly attached to the rubber ring 323, making it difficult for the water to pass through the rubber ring 323. When the pressure between the fixed flange 111 and the rubber diaphragm 213 increases to a certain extent, the water pressure below the second movable plug 324 also increases to a certain extent. The water pressure will compress the second movable plug 324, causing it to squeeze the rubber ring 323 and deform. The second movable plug 324 passes over the rubber ring 323 and comes above the rubber ring 323. At this time, the water can flow smoothly from below to above, that is, the flow rate of water from the space between the fixed flange 111 and the rubber diaphragm 213 to the inner wall of the fixed flange 111 increases. At this time, the inflow and outflow of the space between the fixed flange 111 and the rubber diaphragm 213 are equal.

[0032] One specific application of this embodiment is as follows: When in use, a composite liner is placed inside the pipe, and there is a small gap between the liner and the inner wall of the pipe. The pipe is placed on the support platform 14, and the pressure device above the support platform is activated to fix the pipe and prevent it from shifting. The external pressurizer is activated to allow water to flow through the outlet 16 into the water injection chamber 15, and then into the pipe to pressurize the inside of the pipe. After maintaining a certain pressure for a certain period of time, the pressure inside the pipe is reduced and the pipe is removed.

[0033] As the water injection chamber 15 moves towards both sides of the pipe and the pipe openings on both sides are blocked with plugs, the inside of the pipe is pressurized. After pressurization and maintaining the pressure for a period of time, the pressure is then released. Figure 8 As shown, at this time, the water pressure on the left side of the fixed plate 113 is the water pressure inside the pipe, while the water pressure on the right side of the fixed plate 113 is continuously decreasing. Due to the pressure difference, the water flow on the left side of the fixed plate 113 flows along the fixed ring 311 into the space between the rubber diaphragm 213 and the fixed flange 111, and is discharged to the right through the fixed ring 311 on the right side of the fixed plate 113. Since there are seven fixed grooves 221 on both sides of the fixed plate 113, there are also seven fixed rings 311 on both sides of the fixed plate 113. Of the seven fixed rings 311 on the left side of the fixed plate 113, three are oriented in the opposite direction to the other four, meaning three fixed rings 311 are oriented as shown in the diagram. Figure 8 The F state in the diagram, and the other four states are presented as follows: Figure 8 In the state of G, that is, the stop block 313 faces the inner wall of the fixed flange 111, when the water flows through it... Figure 8 In the state of F, such as Figure 12 As shown, water flows in from the narrow opening above the fixed ring 311, pushing the moving plug 312 to press against the stop block 313. At this time, the water can flow smoothly from top to bottom, that is, the water can flow smoothly from the inner wall of the fixed flange 111 to the outer wall. When the water flows through... Figure 8 In the state of G, such as Figure 12As shown, the water flows from bottom to top, pushing the moving plug 312 upwards and blocking the narrow opening above the fixing ring 311. This makes it difficult for the water to flow from bottom to top, i.e., it makes it difficult for the water to flow from the inner wall of the fixing flange 111 to the outer wall. Therefore, when the water flows from the inner wall of the fixing flange 111 to the gap between the fixing flange 111 and the rubber diaphragm 213, four openings allow water to flow out. The situation is reversed for the fixing rings 311 on both sides of the fixing plate 113, i.e., four fixing rings 311 appear as shown... Figure 8 In the state of F, the three fixed rings 311 present as follows Figure 8 In state G, the water flow between the fixed flange 111 and the rubber diaphragm 213 has only three outlets leading to the inner wall of the fixed flange 111. At this time, the inflow of water between the fixed flange 111 and the rubber diaphragm 213 is greater than the outflow, thus maintaining a certain pressure in this space, which decreases as the pressure inside the pipe decreases. When the pressure inside the pipe decreases to a certain level, the expansion of the rubber diaphragm 213 is insufficient to resist the elastic potential energy generated by the stretching of the spring 122. Therefore, the spring 122 pulls the slider 121, which in turn moves the rubber diaphragm 213 fixed to the water drip groove 211 towards itself, allowing the rubber diaphragm 213 to adhere to the fixed flange 111, and the water in the pipe to flow out completely. Since the diameter of the fixed flange 111 is smaller than the inner diameter of the composite lining, and also... The thickness of the rubber membrane 213 is also smaller than the diameter of the composite liner, so the fixed flange 111 will not contact the composite liner when entering and exiting the pipeline. Furthermore, by setting the sealing ring 123, it is difficult for water flow between the fixed flange 111 and the rubber membrane 213 to flow into the gap between the slider 121 and the water-passing component 11. Through the application of the above components, it effectively prevents the situation where, when using conventional frustum-shaped plugs to seal the pipe ends, the frustum-shaped plugs will first exert radial and axial pressure on the composite liner during the axial tightening process, forcing the composite liner layers on both sides of the pipeline to be squeezed towards the middle along the pipe axis. As a result, the composite liner in the middle section of the pipeline is prone to local wrinkles, interlayer misalignment, and radial bulging defects, which in turn leads to poor adhesion between the composite liner and the inner wall of the outer pipe during the pressing process, reducing the overall forming quality of the pipeline.

[0034] Taking advantage of the feature of the aforementioned equipment that fixes the flange 111 into the pipeline, when the two water injection chambers 15 are brought close together and the fixing flange 111 has entered the pipeline a certain distance, the pressure pump on the outer wall begins to inject water. At this time, the water flows in from the fixing ring 311 located on the right side of the fixing plate 113, and flows out from the right side of the fixing plate 113 in a... Figure 8 The fluid flows through the fixed ring 311 in state F, entering the space between the fixed flange 111 and the rubber diaphragm 213, that is, flowing from the inner wall of the fixed flange 111 into the space between the fixed flange 111 and the rubber diaphragm 213, and from the left side of the fixed plate 113 as shown in the image. Figure 8The fixed ring 311 in the F state flows out, that is, it flows into the inner wall of the fixed flange 111 from the space between the fixed flange 111 and the rubber diaphragm 213 and enters the pipe. However, because the right side of the fixed plate 113 is in the F state, the fixed ring 311 flows out. Figure 8 There are 4 fixed rings 311 in state F, and 3 fixed rings 311 on the left side of the fixed plate 113 in state F. Therefore, the inflow and outflow of water between the fixed flange 111 and the rubber membrane 213 are large, resulting in a continuous increase in water pressure between the fixed flange 111 and the rubber membrane 213. This causes the rubber membrane 213 to expand rapidly, adhering to the inner wall of the composite lining and increasing the contact area with the composite lining. However, due to the restriction of the two metal ribs 214, the expansion of the rubber membrane 213 on both sides is relatively small. The rubber membrane 213 can expand significantly from the position between the two metal ribs 214. When the rubber membrane 213 expands, it generates tension, pulling the slider 121 away from the spring 122, causing the spring 122 to accumulate elastic potential energy. The distance between the first water droplet groove 211 and the second water droplet groove 212 decreases, allowing the rubber membrane 213 to better contact the inner wall of the composite lining. However, due to the continuous increase in pressure in the space between the fixed flange 111 and the rubber membrane 213, such as... Figure 11 As shown, water enters from below, and the second movable plug 324 will be tightly pressed against the rubber ring 323, making it difficult for the water to pass through. When the pressure between the fixed flange 111 and the rubber diaphragm 213 increases to a certain extent, the water pressure below the second movable plug 324 also increases to a certain extent. The water pressure will compress the second movable plug 324, causing it to squeeze and deform the rubber ring 323. The second movable plug 324 then passes over the rubber ring 323 and comes above it. At this point, the water can flow smoothly from below to above, meaning the flow rate of water from the space between the fixed flange 111 and the rubber diaphragm 213 to the inner wall of the fixed flange 111 increases. When the inflow and outflow of water are equal, the water pressure in the space between the fixed flange 111 and the rubber diaphragm 213 remains constant until the water pressure in the pipeline increases to the specified requirement. Then, the water pressure in the pipeline and the water pressure in the rubber diaphragm 213 increase together. As a result, the greater the pipeline pressure, the greater the water pressure in the rubber diaphragm 213, and the stronger the contact between the rubber diaphragm 213 and the composite liner, resulting in a better seal. When the water pressure in the pipeline begins to depressurize, the moving plug 324 is pushed by the water pressure difference, passing over the rubber ring 323 and returning below it. Through the application of the above components, the problem of needing to connect an additional air-filling pipe to inflate the self-tightening sealing ring when using conventional plugs, which affects the continuity of operation, is effectively prevented.

[0035] Utilizing the characteristic of the rubber diaphragm 213 tightly adhering to the composite lining, when the water pressure inside the pipeline continuously increases, the outer pipe will slightly increase in diameter due to pressure compression. To prevent leakage, the plug will further compress the pipe openings on both sides, causing significant deformation of the outer pipe after compression, which is difficult to recover. This results in a longer length cut off at both ends of the pipeline. When the outer pipe is expanded, the rubber diaphragm 213, because its internal water pressure is basically equal to that inside the pipeline, can always contact the inner wall of the composite lining. There is no need to further compress the plug, and it can directly adapt to the expanded pipe diameter. Furthermore, due to the expandable nature of the rubber diaphragm 213, it can maintain close contact with the inner wall of the composite lining even for pipelines of larger sizes. Moreover, by moving the water injection chamber 15, it can adapt to pipelines of different lengths. Through the application of the above components, the problem of the outer pipe slightly increasing in diameter due to pressure compression, and the plug further compressing the pipe openings on both sides, leading to an unrecoverable deformation of the outer pipe and an increased length cut off at both ends of the pipeline, is effectively prevented. At the same time, the adaptability of the device to pipelines of different specifications is improved.

[0036] Utilizing the expansion characteristics of the rubber membrane 213 in the aforementioned device, by setting the first water droplet groove 211 and the second water droplet groove 212 into a teardrop shape with a large internal space and a small external space, and designing the rubber membrane 213 to conform to the contours of the two water droplet grooves, when the rubber membrane 213 expands and its end is pulled, it is restricted by the first water droplet groove 211 and the second water droplet groove 212. At this time, the rubber membrane 213 is difficult to detach from the fixed position. Furthermore, due to the restriction of the metal ribs 214 on both sides of the rubber membrane 213, the rubber membrane 213 can only expand from the position where the two metal ribs 214 are not connected. Through the application of the above components, the problem of the rubber breaking at the connection point with the metal due to excessive pressure when the rubber is connected to the metal through vulcanization is effectively prevented. At the same time, it also prevents the rubber membrane 213 from being restricted by the pipeline during sealing, causing the rubber membrane 213 to expand to both sides and exceed its bearing limit, resulting in rupture.

[0037] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-layer composite lining pressing device for hydrogen embrittlement resistant austenitic stainless steel pipes, comprising a machine base (13), wherein a plurality of support platforms (14) are fixedly connected to the top of the machine base (13), and two water injection chambers (15) are fixedly connected to the top of the machine base (13), wherein each of the two water injection chambers (15) has a water outlet (16) on its side away from each other, characterized in that, Also includes: The fixing mechanism (1) is fixedly installed on the outer wall of the water injection tank (15); A sealing mechanism (2) is fixedly installed on the outer wall of the fixing mechanism (1) on the side away from the water injection tank (15); Water supply mechanism (3), which is fixedly installed on the inner wall of the fixed mechanism (1) on the side away from the water injection tank (15); The pipe is filled with a composite liner, and there is a small gap between the liner and the inner wall of the pipe. The pipe is placed on a support platform (14). There are three support platforms (14) to support the pipe. A pressing device is set above the support platform (14) to press the pipe and keep it fixed. Then the plugs are used to block both ends of the pipe.

2. The apparatus for pressing a multilayer composite lining of a hydrogen embrittlement resistant austenitic stainless steel pipe according to claim 1, characterized in that: The fixing mechanism (1) includes: Water supply component (11), which is fixedly installed on the outer wall of the water injection chamber (15) on the side away from the water outlet (16); A movable component (12) is slidably disposed on the inner wall of the water-passing component (11); The water outlet (16) is connected to the pressurizer. The pressurizer injects water into the water injection chamber (15) and then into the pipe, pressurizing the pipe so that the composite lining expands and fits the inner wall of the pipe.

3. The multi-layer composite lining pressing device for hydrogen embrittlement resistant austenitic stainless steel pipes according to claim 2, characterized in that: The sealing mechanism (2) includes: The elastic component (21) is fixedly disposed on the outer wall of the water-passing component (11) on the side away from the water injection chamber (15); A flow passage component (22) is provided on the inner wall of the water passage component (11) on the side away from the water injection chamber (15); Among them, the elastic component (21) is used for sealing, and the flow component (22) is used to fix the water flow mechanism (3).

4. The multi-layer composite lining pressing device for hydrogen embrittlement-resistant austenitic stainless steel pipes according to claim 3, characterized in that: The water supply mechanism (3) includes: A one-way component (31) is fixedly disposed on the inner wall of the flow-through component (22); A flow-reducing assembly (32) is fixedly disposed on the inner wall of the flow-passing assembly (22); Among them, the unidirectional component (31) is used for water inlet and outlet inside the elastic component (21), and the drainage component (32) prevents the elastic component (21) from over-expanding.

5. The multi-layer composite lining pressing device for hydrogen embrittlement resistant austenitic stainless steel pipes according to claim 4, characterized in that: The water supply assembly (11) includes several fixed flanges (111) fixedly connected to the side of the water injection chamber (15) away from the water outlet (16). The outer walls of the several fixed flanges (111) are all fixedly connected to limit rings (112), and the inner walls of the several fixed flanges (111) away from the limit rings (112) are fixedly connected to a fixing plate (113). Among them, the limiting ring (112) and the fixing plate (113) are coaxial, and the fixing flange (111) is connected to the water injection tank (15).

6. The multi-layer composite lining pressing device for hydrogen embrittlement-resistant austenitic stainless steel pipes according to claim 5, characterized in that: The moving component (12) includes a slider (121) slidably connected to the inner wall of the limiting ring (112), a spring (122) fixedly connected to the outer wall of the slider (121), and a sealing ring (123) fixedly connected to the outer wall of the slider (121). The spring (122) is fixedly connected to the fixed flange (111) on the side away from the slider (121), and the sealing ring (123) is located on the side of the slider (121) away from the spring (122).

7. The multi-layer composite lining pressing device for hydrogen embrittlement-resistant austenitic stainless steel pipes according to claim 6, characterized in that: The elastic component (21) includes a water droplet groove one (211) formed on the outer wall of the slider (121), and a water droplet groove two (212) formed on the outer wall of the fixed flange (111) on the side away from the slider (121). A rubber membrane (213) is fixedly connected to the inner wall of the water droplet groove one (211), and two metal ribs (214) are fixedly connected to the inner wall of the rubber membrane (213). Among them, the side of the rubber membrane (213) away from the first water droplet (211) is fixedly connected to the second water droplet (212), and the two metal ribs (214) are close to the first water droplet (211) and the second water droplet (212) respectively. The two rubber membranes (213) are not connected together, and the material of the rubber membrane (213) is silicone rubber.

8. The multi-layer composite lining pressing device for hydrogen embrittlement resistant austenitic stainless steel pipes according to claim 6, characterized in that: The flow assembly (22) includes a plurality of fixing grooves (221) on the side of the fixing flange (111) away from the slider (121), and a plurality of fixing grooves (222) are provided on the outer wall of the fixing flange (111). There are fourteen fixing slots (221), which are divided into two groups. Each group of fixing slots (221) is arranged in a circular array. The two groups of fixing slots (221) are arranged in a mirror image around the fixing plate (113). There are three fixing slots (222). The three fixing slots (222) are located on the side of the fixing plate (113) away from the spring (122).

9. The multi-layer composite lining pressing device for hydrogen embrittlement resistant austenitic stainless steel pipes according to claim 8, characterized in that: The unidirectional component (31) includes a fixed ring (311) fixedly connected to the inner wall of the fixed groove (221), a movable plug (312) is provided inside the fixed ring (311), and a stop block (313) is fixedly connected to the inner wall of the fixed ring (311). Among them, the side of the fixed ring 1 (311) away from the stop block 1 (313) is designed with a narrow opening, so that the moving plug 1 (312) cannot pass through the narrow opening of the fixed ring 1 (311) and pass over the stop block 1 (313).

10. The multi-layer composite lining pressing device for hydrogen embrittlement resistant austenitic stainless steel pipes according to claim 9, characterized in that: The drainage assembly (32) includes a fixed ring two (321) fixedly connected to the inner wall of the fixed groove two (222). The inner wall of the fixed ring two (321) is fixedly connected to two stop blocks two (322). A rubber ring (323) is fixedly connected to the middle inner wall of the fixed ring two (321). A movable plug two (324) is provided inside the fixed ring one (311). Among them, the movable plug 2 (324) moves within the fixed ring 2 (321) and is restricted by the two stop blocks 2 (322), so it will not fall out of the fixed ring 1 (311). The rubber ring (323) is made of hard rubber, and the movable plug 2 (324) will fit against the rubber ring (323).

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